net/sched: flower: fix error handler on replace

[linux-2.6-microblaze.git] / net / bluetooth / hci_sync.c

// SPDX-License-Identifier: GPL-2.0
/*
 * BlueZ - Bluetooth protocol stack for Linux
 *
 * Copyright (C) 2021 Intel Corporation
 */

#include <linux/property.h>

#include <net/bluetooth/bluetooth.h>
#include <net/bluetooth/hci_core.h>
#include <net/bluetooth/mgmt.h>

#include "hci_request.h"
#include "hci_codec.h"
#include "hci_debugfs.h"
#include "smp.h"
#include "eir.h"
#include "msft.h"
#include "aosp.h"
#include "leds.h"

static void hci_cmd_sync_complete(struct hci_dev *hdev, u8 result, u16 opcode,
                                  struct sk_buff *skb)
{
        bt_dev_dbg(hdev, "result 0x%2.2x", result);

        if (hdev->req_status != HCI_REQ_PEND)
                return;

        hdev->req_result = result;
        hdev->req_status = HCI_REQ_DONE;

        if (skb) {
                struct sock *sk = hci_skb_sk(skb);

                /* Drop sk reference if set */
                if (sk)
                        sock_put(sk);

                hdev->req_skb = skb_get(skb);
        }

        wake_up_interruptible(&hdev->req_wait_q);
}

static struct sk_buff *hci_cmd_sync_alloc(struct hci_dev *hdev, u16 opcode,
                                          u32 plen, const void *param,
                                          struct sock *sk)
{
        int len = HCI_COMMAND_HDR_SIZE + plen;
        struct hci_command_hdr *hdr;
        struct sk_buff *skb;

        skb = bt_skb_alloc(len, GFP_ATOMIC);
        if (!skb)
                return NULL;

        hdr = skb_put(skb, HCI_COMMAND_HDR_SIZE);
        hdr->opcode = cpu_to_le16(opcode);
        hdr->plen   = plen;

        if (plen)
                skb_put_data(skb, param, plen);

        bt_dev_dbg(hdev, "skb len %d", skb->len);

        hci_skb_pkt_type(skb) = HCI_COMMAND_PKT;
        hci_skb_opcode(skb) = opcode;

        /* Grab a reference if command needs to be associated with a sock (e.g.
         * likely mgmt socket that initiated the command).
         */
        if (sk) {
                hci_skb_sk(skb) = sk;
                sock_hold(sk);
        }

        return skb;
}

static void hci_cmd_sync_add(struct hci_request *req, u16 opcode, u32 plen,
                             const void *param, u8 event, struct sock *sk)
{
        struct hci_dev *hdev = req->hdev;
        struct sk_buff *skb;

        bt_dev_dbg(hdev, "opcode 0x%4.4x plen %d", opcode, plen);

        /* If an error occurred during request building, there is no point in
         * queueing the HCI command. We can simply return.
         */
        if (req->err)
                return;

        skb = hci_cmd_sync_alloc(hdev, opcode, plen, param, sk);
        if (!skb) {
                bt_dev_err(hdev, "no memory for command (opcode 0x%4.4x)",
                           opcode);
                req->err = -ENOMEM;
                return;
        }

        if (skb_queue_empty(&req->cmd_q))
                bt_cb(skb)->hci.req_flags |= HCI_REQ_START;

        hci_skb_event(skb) = event;

        skb_queue_tail(&req->cmd_q, skb);
}

static int hci_cmd_sync_run(struct hci_request *req)
{
        struct hci_dev *hdev = req->hdev;
        struct sk_buff *skb;
        unsigned long flags;

        bt_dev_dbg(hdev, "length %u", skb_queue_len(&req->cmd_q));

        /* If an error occurred during request building, remove all HCI
         * commands queued on the HCI request queue.
         */
        if (req->err) {
                skb_queue_purge(&req->cmd_q);
                return req->err;
        }

        /* Do not allow empty requests */
        if (skb_queue_empty(&req->cmd_q))
                return -ENODATA;

        skb = skb_peek_tail(&req->cmd_q);
        bt_cb(skb)->hci.req_complete_skb = hci_cmd_sync_complete;
        bt_cb(skb)->hci.req_flags |= HCI_REQ_SKB;

        spin_lock_irqsave(&hdev->cmd_q.lock, flags);
        skb_queue_splice_tail(&req->cmd_q, &hdev->cmd_q);
        spin_unlock_irqrestore(&hdev->cmd_q.lock, flags);

        queue_work(hdev->workqueue, &hdev->cmd_work);

        return 0;
}

/* This function requires the caller holds hdev->req_lock. */
struct sk_buff *__hci_cmd_sync_sk(struct hci_dev *hdev, u16 opcode, u32 plen,
                                  const void *param, u8 event, u32 timeout,
                                  struct sock *sk)
{
        struct hci_request req;
        struct sk_buff *skb;
        int err = 0;

        bt_dev_dbg(hdev, "Opcode 0x%4x", opcode);

        hci_req_init(&req, hdev);

        hci_cmd_sync_add(&req, opcode, plen, param, event, sk);

        hdev->req_status = HCI_REQ_PEND;

        err = hci_cmd_sync_run(&req);
        if (err < 0)
                return ERR_PTR(err);

        err = wait_event_interruptible_timeout(hdev->req_wait_q,
                                               hdev->req_status != HCI_REQ_PEND,
                                               timeout);

        if (err == -ERESTARTSYS)
                return ERR_PTR(-EINTR);

        switch (hdev->req_status) {
        case HCI_REQ_DONE:
                err = -bt_to_errno(hdev->req_result);
                break;

        case HCI_REQ_CANCELED:
                err = -hdev->req_result;
                break;

        default:
                err = -ETIMEDOUT;
                break;
        }

        hdev->req_status = 0;
        hdev->req_result = 0;
        skb = hdev->req_skb;
        hdev->req_skb = NULL;

        bt_dev_dbg(hdev, "end: err %d", err);

        if (err < 0) {
                kfree_skb(skb);
                return ERR_PTR(err);
        }

        return skb;
}
EXPORT_SYMBOL(__hci_cmd_sync_sk);

/* This function requires the caller holds hdev->req_lock. */
struct sk_buff *__hci_cmd_sync(struct hci_dev *hdev, u16 opcode, u32 plen,
                               const void *param, u32 timeout)
{
        return __hci_cmd_sync_sk(hdev, opcode, plen, param, 0, timeout, NULL);
}
EXPORT_SYMBOL(__hci_cmd_sync);

/* Send HCI command and wait for command complete event */
struct sk_buff *hci_cmd_sync(struct hci_dev *hdev, u16 opcode, u32 plen,
                             const void *param, u32 timeout)
{
        struct sk_buff *skb;

        if (!test_bit(HCI_UP, &hdev->flags))
                return ERR_PTR(-ENETDOWN);

        bt_dev_dbg(hdev, "opcode 0x%4.4x plen %d", opcode, plen);

        hci_req_sync_lock(hdev);
        skb = __hci_cmd_sync(hdev, opcode, plen, param, timeout);
        hci_req_sync_unlock(hdev);

        return skb;
}
EXPORT_SYMBOL(hci_cmd_sync);

/* This function requires the caller holds hdev->req_lock. */
struct sk_buff *__hci_cmd_sync_ev(struct hci_dev *hdev, u16 opcode, u32 plen,
                                  const void *param, u8 event, u32 timeout)
{
        return __hci_cmd_sync_sk(hdev, opcode, plen, param, event, timeout,
                                 NULL);
}
EXPORT_SYMBOL(__hci_cmd_sync_ev);

/* This function requires the caller holds hdev->req_lock. */
int __hci_cmd_sync_status_sk(struct hci_dev *hdev, u16 opcode, u32 plen,
                             const void *param, u8 event, u32 timeout,
                             struct sock *sk)
{
        struct sk_buff *skb;
        u8 status;

        skb = __hci_cmd_sync_sk(hdev, opcode, plen, param, event, timeout, sk);
        if (IS_ERR(skb)) {
                if (!event)
                        bt_dev_err(hdev, "Opcode 0x%4x failed: %ld", opcode,
                                   PTR_ERR(skb));
                return PTR_ERR(skb);
        }

        /* If command return a status event skb will be set to NULL as there are
         * no parameters, in case of failure IS_ERR(skb) would have be set to
         * the actual error would be found with PTR_ERR(skb).
         */
        if (!skb)
                return 0;

        status = skb->data[0];

        kfree_skb(skb);

        return status;
}
EXPORT_SYMBOL(__hci_cmd_sync_status_sk);

int __hci_cmd_sync_status(struct hci_dev *hdev, u16 opcode, u32 plen,
                          const void *param, u32 timeout)
{
        return __hci_cmd_sync_status_sk(hdev, opcode, plen, param, 0, timeout,
                                        NULL);
}
EXPORT_SYMBOL(__hci_cmd_sync_status);

static void hci_cmd_sync_work(struct work_struct *work)
{
        struct hci_dev *hdev = container_of(work, struct hci_dev, cmd_sync_work);

        bt_dev_dbg(hdev, "");

        /* Dequeue all entries and run them */
        while (1) {
                struct hci_cmd_sync_work_entry *entry;

                mutex_lock(&hdev->cmd_sync_work_lock);
                entry = list_first_entry_or_null(&hdev->cmd_sync_work_list,
                                                 struct hci_cmd_sync_work_entry,
                                                 list);
                if (entry)
                        list_del(&entry->list);
                mutex_unlock(&hdev->cmd_sync_work_lock);

                if (!entry)
                        break;

                bt_dev_dbg(hdev, "entry %p", entry);

                if (entry->func) {
                        int err;

                        hci_req_sync_lock(hdev);
                        err = entry->func(hdev, entry->data);
                        if (entry->destroy)
                                entry->destroy(hdev, entry->data, err);
                        hci_req_sync_unlock(hdev);
                }

                kfree(entry);
        }
}

static void hci_cmd_sync_cancel_work(struct work_struct *work)
{
        struct hci_dev *hdev = container_of(work, struct hci_dev, cmd_sync_cancel_work);

        cancel_delayed_work_sync(&hdev->cmd_timer);
        cancel_delayed_work_sync(&hdev->ncmd_timer);
        atomic_set(&hdev->cmd_cnt, 1);

        wake_up_interruptible(&hdev->req_wait_q);
}

static int hci_scan_disable_sync(struct hci_dev *hdev);
static int scan_disable_sync(struct hci_dev *hdev, void *data)
{
        return hci_scan_disable_sync(hdev);
}

static int hci_inquiry_sync(struct hci_dev *hdev, u8 length);
static int interleaved_inquiry_sync(struct hci_dev *hdev, void *data)
{
        return hci_inquiry_sync(hdev, DISCOV_INTERLEAVED_INQUIRY_LEN);
}

static void le_scan_disable(struct work_struct *work)
{
        struct hci_dev *hdev = container_of(work, struct hci_dev,
                                            le_scan_disable.work);
        int status;

        bt_dev_dbg(hdev, "");
        hci_dev_lock(hdev);

        if (!hci_dev_test_flag(hdev, HCI_LE_SCAN))
                goto _return;

        cancel_delayed_work(&hdev->le_scan_restart);

        status = hci_cmd_sync_queue(hdev, scan_disable_sync, NULL, NULL);
        if (status) {
                bt_dev_err(hdev, "failed to disable LE scan: %d", status);
                goto _return;
        }

        hdev->discovery.scan_start = 0;

        /* If we were running LE only scan, change discovery state. If
         * we were running both LE and BR/EDR inquiry simultaneously,
         * and BR/EDR inquiry is already finished, stop discovery,
         * otherwise BR/EDR inquiry will stop discovery when finished.
         * If we will resolve remote device name, do not change
         * discovery state.
         */

        if (hdev->discovery.type == DISCOV_TYPE_LE)
                goto discov_stopped;

        if (hdev->discovery.type != DISCOV_TYPE_INTERLEAVED)
                goto _return;

        if (test_bit(HCI_QUIRK_SIMULTANEOUS_DISCOVERY, &hdev->quirks)) {
                if (!test_bit(HCI_INQUIRY, &hdev->flags) &&
                    hdev->discovery.state != DISCOVERY_RESOLVING)
                        goto discov_stopped;

                goto _return;
        }

        status = hci_cmd_sync_queue(hdev, interleaved_inquiry_sync, NULL, NULL);
        if (status) {
                bt_dev_err(hdev, "inquiry failed: status %d", status);
                goto discov_stopped;
        }

        goto _return;

discov_stopped:
        hci_discovery_set_state(hdev, DISCOVERY_STOPPED);

_return:
        hci_dev_unlock(hdev);
}

static int hci_le_set_scan_enable_sync(struct hci_dev *hdev, u8 val,
                                       u8 filter_dup);
static int hci_le_scan_restart_sync(struct hci_dev *hdev)
{
        /* If controller is not scanning we are done. */
        if (!hci_dev_test_flag(hdev, HCI_LE_SCAN))
                return 0;

        if (hdev->scanning_paused) {
                bt_dev_dbg(hdev, "Scanning is paused for suspend");
                return 0;
        }

        hci_le_set_scan_enable_sync(hdev, LE_SCAN_DISABLE, 0x00);
        return hci_le_set_scan_enable_sync(hdev, LE_SCAN_ENABLE,
                                           LE_SCAN_FILTER_DUP_ENABLE);
}

static int le_scan_restart_sync(struct hci_dev *hdev, void *data)
{
        return hci_le_scan_restart_sync(hdev);
}

static void le_scan_restart(struct work_struct *work)
{
        struct hci_dev *hdev = container_of(work, struct hci_dev,
                                            le_scan_restart.work);
        unsigned long timeout, duration, scan_start, now;
        int status;

        bt_dev_dbg(hdev, "");

        hci_dev_lock(hdev);

        status = hci_cmd_sync_queue(hdev, le_scan_restart_sync, NULL, NULL);
        if (status) {
                bt_dev_err(hdev, "failed to restart LE scan: status %d",
                           status);
                goto unlock;
        }

        if (!test_bit(HCI_QUIRK_STRICT_DUPLICATE_FILTER, &hdev->quirks) ||
            !hdev->discovery.scan_start)
                goto unlock;

        /* When the scan was started, hdev->le_scan_disable has been queued
         * after duration from scan_start. During scan restart this job
         * has been canceled, and we need to queue it again after proper
         * timeout, to make sure that scan does not run indefinitely.
         */
        duration = hdev->discovery.scan_duration;
        scan_start = hdev->discovery.scan_start;
        now = jiffies;
        if (now - scan_start <= duration) {
                int elapsed;

                if (now >= scan_start)
                        elapsed = now - scan_start;
                else
                        elapsed = ULONG_MAX - scan_start + now;

                timeout = duration - elapsed;
        } else {
                timeout = 0;
        }

        queue_delayed_work(hdev->req_workqueue,
                           &hdev->le_scan_disable, timeout);

unlock:
        hci_dev_unlock(hdev);
}

static int reenable_adv_sync(struct hci_dev *hdev, void *data)
{
        bt_dev_dbg(hdev, "");

        if (!hci_dev_test_flag(hdev, HCI_ADVERTISING) &&
            list_empty(&hdev->adv_instances))
                return 0;

        if (hdev->cur_adv_instance) {
                return hci_schedule_adv_instance_sync(hdev,
                                                      hdev->cur_adv_instance,
                                                      true);
        } else {
                if (ext_adv_capable(hdev)) {
                        hci_start_ext_adv_sync(hdev, 0x00);
                } else {
                        hci_update_adv_data_sync(hdev, 0x00);
                        hci_update_scan_rsp_data_sync(hdev, 0x00);
                        hci_enable_advertising_sync(hdev);
                }
        }

        return 0;
}

static void reenable_adv(struct work_struct *work)
{
        struct hci_dev *hdev = container_of(work, struct hci_dev,
                                            reenable_adv_work);
        int status;

        bt_dev_dbg(hdev, "");

        hci_dev_lock(hdev);

        status = hci_cmd_sync_queue(hdev, reenable_adv_sync, NULL, NULL);
        if (status)
                bt_dev_err(hdev, "failed to reenable ADV: %d", status);

        hci_dev_unlock(hdev);
}

static void cancel_adv_timeout(struct hci_dev *hdev)
{
        if (hdev->adv_instance_timeout) {
                hdev->adv_instance_timeout = 0;
                cancel_delayed_work(&hdev->adv_instance_expire);
        }
}

/* For a single instance:
 * - force == true: The instance will be removed even when its remaining
 *   lifetime is not zero.
 * - force == false: the instance will be deactivated but kept stored unless
 *   the remaining lifetime is zero.
 *
 * For instance == 0x00:
 * - force == true: All instances will be removed regardless of their timeout
 *   setting.
 * - force == false: Only instances that have a timeout will be removed.
 */
int hci_clear_adv_instance_sync(struct hci_dev *hdev, struct sock *sk,
                                u8 instance, bool force)
{
        struct adv_info *adv_instance, *n, *next_instance = NULL;
        int err;
        u8 rem_inst;

        /* Cancel any timeout concerning the removed instance(s). */
        if (!instance || hdev->cur_adv_instance == instance)
                cancel_adv_timeout(hdev);

        /* Get the next instance to advertise BEFORE we remove
         * the current one. This can be the same instance again
         * if there is only one instance.
         */
        if (instance && hdev->cur_adv_instance == instance)
                next_instance = hci_get_next_instance(hdev, instance);

        if (instance == 0x00) {
                list_for_each_entry_safe(adv_instance, n, &hdev->adv_instances,
                                         list) {
                        if (!(force || adv_instance->timeout))
                                continue;

                        rem_inst = adv_instance->instance;
                        err = hci_remove_adv_instance(hdev, rem_inst);
                        if (!err)
                                mgmt_advertising_removed(sk, hdev, rem_inst);
                }
        } else {
                adv_instance = hci_find_adv_instance(hdev, instance);

                if (force || (adv_instance && adv_instance->timeout &&
                              !adv_instance->remaining_time)) {
                        /* Don't advertise a removed instance. */
                        if (next_instance &&
                            next_instance->instance == instance)
                                next_instance = NULL;

                        err = hci_remove_adv_instance(hdev, instance);
                        if (!err)
                                mgmt_advertising_removed(sk, hdev, instance);
                }
        }

        if (!hdev_is_powered(hdev) || hci_dev_test_flag(hdev, HCI_ADVERTISING))
                return 0;

        if (next_instance && !ext_adv_capable(hdev))
                return hci_schedule_adv_instance_sync(hdev,
                                                      next_instance->instance,
                                                      false);

        return 0;
}

static int adv_timeout_expire_sync(struct hci_dev *hdev, void *data)
{
        u8 instance = *(u8 *)data;

        kfree(data);

        hci_clear_adv_instance_sync(hdev, NULL, instance, false);

        if (list_empty(&hdev->adv_instances))
                return hci_disable_advertising_sync(hdev);

        return 0;
}

static void adv_timeout_expire(struct work_struct *work)
{
        u8 *inst_ptr;
        struct hci_dev *hdev = container_of(work, struct hci_dev,
                                            adv_instance_expire.work);

        bt_dev_dbg(hdev, "");

        hci_dev_lock(hdev);

        hdev->adv_instance_timeout = 0;

        if (hdev->cur_adv_instance == 0x00)
                goto unlock;

        inst_ptr = kmalloc(1, GFP_KERNEL);
        if (!inst_ptr)
                goto unlock;

        *inst_ptr = hdev->cur_adv_instance;
        hci_cmd_sync_queue(hdev, adv_timeout_expire_sync, inst_ptr, NULL);

unlock:
        hci_dev_unlock(hdev);
}

void hci_cmd_sync_init(struct hci_dev *hdev)
{
        INIT_WORK(&hdev->cmd_sync_work, hci_cmd_sync_work);
        INIT_LIST_HEAD(&hdev->cmd_sync_work_list);
        mutex_init(&hdev->cmd_sync_work_lock);

        INIT_WORK(&hdev->cmd_sync_cancel_work, hci_cmd_sync_cancel_work);
        INIT_WORK(&hdev->reenable_adv_work, reenable_adv);
        INIT_DELAYED_WORK(&hdev->le_scan_disable, le_scan_disable);
        INIT_DELAYED_WORK(&hdev->le_scan_restart, le_scan_restart);
        INIT_DELAYED_WORK(&hdev->adv_instance_expire, adv_timeout_expire);
}

void hci_cmd_sync_clear(struct hci_dev *hdev)
{
        struct hci_cmd_sync_work_entry *entry, *tmp;

        cancel_work_sync(&hdev->cmd_sync_work);
        cancel_work_sync(&hdev->reenable_adv_work);

        mutex_lock(&hdev->cmd_sync_work_lock);
        list_for_each_entry_safe(entry, tmp, &hdev->cmd_sync_work_list, list) {
                if (entry->destroy)
                        entry->destroy(hdev, entry->data, -ECANCELED);

                list_del(&entry->list);
                kfree(entry);
        }
        mutex_unlock(&hdev->cmd_sync_work_lock);
}

void __hci_cmd_sync_cancel(struct hci_dev *hdev, int err)
{
        bt_dev_dbg(hdev, "err 0x%2.2x", err);

        if (hdev->req_status == HCI_REQ_PEND) {
                hdev->req_result = err;
                hdev->req_status = HCI_REQ_CANCELED;

                cancel_delayed_work_sync(&hdev->cmd_timer);
                cancel_delayed_work_sync(&hdev->ncmd_timer);
                atomic_set(&hdev->cmd_cnt, 1);

                wake_up_interruptible(&hdev->req_wait_q);
        }
}

void hci_cmd_sync_cancel(struct hci_dev *hdev, int err)
{
        bt_dev_dbg(hdev, "err 0x%2.2x", err);

        if (hdev->req_status == HCI_REQ_PEND) {
                hdev->req_result = err;
                hdev->req_status = HCI_REQ_CANCELED;

                queue_work(hdev->workqueue, &hdev->cmd_sync_cancel_work);
        }
}
EXPORT_SYMBOL(hci_cmd_sync_cancel);

/* Submit HCI command to be run in as cmd_sync_work:
 *
 * - hdev must _not_ be unregistered
 */
int hci_cmd_sync_submit(struct hci_dev *hdev, hci_cmd_sync_work_func_t func,
                        void *data, hci_cmd_sync_work_destroy_t destroy)
{
        struct hci_cmd_sync_work_entry *entry;

        if (hci_dev_test_flag(hdev, HCI_UNREGISTER))
                return -ENODEV;

        entry = kmalloc(sizeof(*entry), GFP_KERNEL);
        if (!entry)
                return -ENOMEM;

        entry->func = func;
        entry->data = data;
        entry->destroy = destroy;

        mutex_lock(&hdev->cmd_sync_work_lock);
        list_add_tail(&entry->list, &hdev->cmd_sync_work_list);
        mutex_unlock(&hdev->cmd_sync_work_lock);

        queue_work(hdev->req_workqueue, &hdev->cmd_sync_work);

        return 0;
}
EXPORT_SYMBOL(hci_cmd_sync_submit);

/* Queue HCI command:
 *
 * - hdev must be running
 */
int hci_cmd_sync_queue(struct hci_dev *hdev, hci_cmd_sync_work_func_t func,
                       void *data, hci_cmd_sync_work_destroy_t destroy)
{
        /* Only queue command if hdev is running which means it had been opened
         * and is either on init phase or is already up.
         */
        if (!test_bit(HCI_RUNNING, &hdev->flags))
                return -ENETDOWN;

        return hci_cmd_sync_submit(hdev, func, data, destroy);
}
EXPORT_SYMBOL(hci_cmd_sync_queue);

int hci_update_eir_sync(struct hci_dev *hdev)
{
        struct hci_cp_write_eir cp;

        bt_dev_dbg(hdev, "");

        if (!hdev_is_powered(hdev))
                return 0;

        if (!lmp_ext_inq_capable(hdev))
                return 0;

        if (!hci_dev_test_flag(hdev, HCI_SSP_ENABLED))
                return 0;

        if (hci_dev_test_flag(hdev, HCI_SERVICE_CACHE))
                return 0;

        memset(&cp, 0, sizeof(cp));

        eir_create(hdev, cp.data);

        if (memcmp(cp.data, hdev->eir, sizeof(cp.data)) == 0)
                return 0;

        memcpy(hdev->eir, cp.data, sizeof(cp.data));

        return __hci_cmd_sync_status(hdev, HCI_OP_WRITE_EIR, sizeof(cp), &cp,
                                     HCI_CMD_TIMEOUT);
}

static u8 get_service_classes(struct hci_dev *hdev)
{
        struct bt_uuid *uuid;
        u8 val = 0;

        list_for_each_entry(uuid, &hdev->uuids, list)
                val |= uuid->svc_hint;

        return val;
}

int hci_update_class_sync(struct hci_dev *hdev)
{
        u8 cod[3];

        bt_dev_dbg(hdev, "");

        if (!hdev_is_powered(hdev))
                return 0;

        if (!hci_dev_test_flag(hdev, HCI_BREDR_ENABLED))
                return 0;

        if (hci_dev_test_flag(hdev, HCI_SERVICE_CACHE))
                return 0;

        cod[0] = hdev->minor_class;
        cod[1] = hdev->major_class;
        cod[2] = get_service_classes(hdev);

        if (hci_dev_test_flag(hdev, HCI_LIMITED_DISCOVERABLE))
                cod[1] |= 0x20;

        if (memcmp(cod, hdev->dev_class, 3) == 0)
                return 0;

        return __hci_cmd_sync_status(hdev, HCI_OP_WRITE_CLASS_OF_DEV,
                                     sizeof(cod), cod, HCI_CMD_TIMEOUT);
}

static bool is_advertising_allowed(struct hci_dev *hdev, bool connectable)
{
        /* If there is no connection we are OK to advertise. */
        if (hci_conn_num(hdev, LE_LINK) == 0)
                return true;

        /* Check le_states if there is any connection in peripheral role. */
        if (hdev->conn_hash.le_num_peripheral > 0) {
                /* Peripheral connection state and non connectable mode
                 * bit 20.
                 */
                if (!connectable && !(hdev->le_states[2] & 0x10))
                        return false;

                /* Peripheral connection state and connectable mode bit 38
                 * and scannable bit 21.
                 */
                if (connectable && (!(hdev->le_states[4] & 0x40) ||
                                    !(hdev->le_states[2] & 0x20)))
                        return false;
        }

        /* Check le_states if there is any connection in central role. */
        if (hci_conn_num(hdev, LE_LINK) != hdev->conn_hash.le_num_peripheral) {
                /* Central connection state and non connectable mode bit 18. */
                if (!connectable && !(hdev->le_states[2] & 0x02))
                        return false;

                /* Central connection state and connectable mode bit 35 and
                 * scannable 19.
                 */
                if (connectable && (!(hdev->le_states[4] & 0x08) ||
                                    !(hdev->le_states[2] & 0x08)))
                        return false;
        }

        return true;
}

static bool adv_use_rpa(struct hci_dev *hdev, uint32_t flags)
{
        /* If privacy is not enabled don't use RPA */
        if (!hci_dev_test_flag(hdev, HCI_PRIVACY))
                return false;

        /* If basic privacy mode is enabled use RPA */
        if (!hci_dev_test_flag(hdev, HCI_LIMITED_PRIVACY))
                return true;

        /* If limited privacy mode is enabled don't use RPA if we're
         * both discoverable and bondable.
         */
        if ((flags & MGMT_ADV_FLAG_DISCOV) &&
            hci_dev_test_flag(hdev, HCI_BONDABLE))
                return false;

        /* We're neither bondable nor discoverable in the limited
         * privacy mode, therefore use RPA.
         */
        return true;
}

static int hci_set_random_addr_sync(struct hci_dev *hdev, bdaddr_t *rpa)
{
        /* If we're advertising or initiating an LE connection we can't
         * go ahead and change the random address at this time. This is
         * because the eventual initiator address used for the
         * subsequently created connection will be undefined (some
         * controllers use the new address and others the one we had
         * when the operation started).
         *
         * In this kind of scenario skip the update and let the random
         * address be updated at the next cycle.
         */
        if (hci_dev_test_flag(hdev, HCI_LE_ADV) ||
            hci_lookup_le_connect(hdev)) {
                bt_dev_dbg(hdev, "Deferring random address update");
                hci_dev_set_flag(hdev, HCI_RPA_EXPIRED);
                return 0;
        }

        return __hci_cmd_sync_status(hdev, HCI_OP_LE_SET_RANDOM_ADDR,
                                     6, rpa, HCI_CMD_TIMEOUT);
}

int hci_update_random_address_sync(struct hci_dev *hdev, bool require_privacy,
                                   bool rpa, u8 *own_addr_type)
{
        int err;

        /* If privacy is enabled use a resolvable private address. If
         * current RPA has expired or there is something else than
         * the current RPA in use, then generate a new one.
         */
        if (rpa) {
                /* If Controller supports LL Privacy use own address type is
                 * 0x03
                 */
                if (use_ll_privacy(hdev))
                        *own_addr_type = ADDR_LE_DEV_RANDOM_RESOLVED;
                else
                        *own_addr_type = ADDR_LE_DEV_RANDOM;

                /* Check if RPA is valid */
                if (rpa_valid(hdev))
                        return 0;

                err = smp_generate_rpa(hdev, hdev->irk, &hdev->rpa);
                if (err < 0) {
                        bt_dev_err(hdev, "failed to generate new RPA");
                        return err;
                }

                err = hci_set_random_addr_sync(hdev, &hdev->rpa);
                if (err)
                        return err;

                return 0;
        }

        /* In case of required privacy without resolvable private address,
         * use an non-resolvable private address. This is useful for active
         * scanning and non-connectable advertising.
         */
        if (require_privacy) {
                bdaddr_t nrpa;

                while (true) {
                        /* The non-resolvable private address is generated
                         * from random six bytes with the two most significant
                         * bits cleared.
                         */
                        get_random_bytes(&nrpa, 6);
                        nrpa.b[5] &= 0x3f;

                        /* The non-resolvable private address shall not be
                         * equal to the public address.
                         */
                        if (bacmp(&hdev->bdaddr, &nrpa))
                                break;
                }

                *own_addr_type = ADDR_LE_DEV_RANDOM;

                return hci_set_random_addr_sync(hdev, &nrpa);
        }

        /* If forcing static address is in use or there is no public
         * address use the static address as random address (but skip
         * the HCI command if the current random address is already the
         * static one.
         *
         * In case BR/EDR has been disabled on a dual-mode controller
         * and a static address has been configured, then use that
         * address instead of the public BR/EDR address.
         */
        if (hci_dev_test_flag(hdev, HCI_FORCE_STATIC_ADDR) ||
            !bacmp(&hdev->bdaddr, BDADDR_ANY) ||
            (!hci_dev_test_flag(hdev, HCI_BREDR_ENABLED) &&
             bacmp(&hdev->static_addr, BDADDR_ANY))) {
                *own_addr_type = ADDR_LE_DEV_RANDOM;
                if (bacmp(&hdev->static_addr, &hdev->random_addr))
                        return hci_set_random_addr_sync(hdev,
                                                        &hdev->static_addr);
                return 0;
        }

        /* Neither privacy nor static address is being used so use a
         * public address.
         */
        *own_addr_type = ADDR_LE_DEV_PUBLIC;

        return 0;
}

static int hci_disable_ext_adv_instance_sync(struct hci_dev *hdev, u8 instance)
{
        struct hci_cp_le_set_ext_adv_enable *cp;
        struct hci_cp_ext_adv_set *set;
        u8 data[sizeof(*cp) + sizeof(*set) * 1];
        u8 size;

        /* If request specifies an instance that doesn't exist, fail */
        if (instance > 0) {
                struct adv_info *adv;

                adv = hci_find_adv_instance(hdev, instance);
                if (!adv)
                        return -EINVAL;

                /* If not enabled there is nothing to do */
                if (!adv->enabled)
                        return 0;
        }

        memset(data, 0, sizeof(data));

        cp = (void *)data;
        set = (void *)cp->data;

        /* Instance 0x00 indicates all advertising instances will be disabled */
        cp->num_of_sets = !!instance;
        cp->enable = 0x00;

        set->handle = instance;

        size = sizeof(*cp) + sizeof(*set) * cp->num_of_sets;

        return __hci_cmd_sync_status(hdev, HCI_OP_LE_SET_EXT_ADV_ENABLE,
                                     size, data, HCI_CMD_TIMEOUT);
}

static int hci_set_adv_set_random_addr_sync(struct hci_dev *hdev, u8 instance,
                                            bdaddr_t *random_addr)
{
        struct hci_cp_le_set_adv_set_rand_addr cp;
        int err;

        if (!instance) {
                /* Instance 0x00 doesn't have an adv_info, instead it uses
                 * hdev->random_addr to track its address so whenever it needs
                 * to be updated this also set the random address since
                 * hdev->random_addr is shared with scan state machine.
                 */
                err = hci_set_random_addr_sync(hdev, random_addr);
                if (err)
                        return err;
        }

        memset(&cp, 0, sizeof(cp));

        cp.handle = instance;
        bacpy(&cp.bdaddr, random_addr);

        return __hci_cmd_sync_status(hdev, HCI_OP_LE_SET_ADV_SET_RAND_ADDR,
                                     sizeof(cp), &cp, HCI_CMD_TIMEOUT);
}

int hci_setup_ext_adv_instance_sync(struct hci_dev *hdev, u8 instance)
{
        struct hci_cp_le_set_ext_adv_params cp;
        bool connectable;
        u32 flags;
        bdaddr_t random_addr;
        u8 own_addr_type;
        int err;
        struct adv_info *adv;
        bool secondary_adv;

        if (instance > 0) {
                adv = hci_find_adv_instance(hdev, instance);
                if (!adv)
                        return -EINVAL;
        } else {
                adv = NULL;
        }

        /* Updating parameters of an active instance will return a
         * Command Disallowed error, so we must first disable the
         * instance if it is active.
         */
        if (adv && !adv->pending) {
                err = hci_disable_ext_adv_instance_sync(hdev, instance);
                if (err)
                        return err;
        }

        flags = hci_adv_instance_flags(hdev, instance);

        /* If the "connectable" instance flag was not set, then choose between
         * ADV_IND and ADV_NONCONN_IND based on the global connectable setting.
         */
        connectable = (flags & MGMT_ADV_FLAG_CONNECTABLE) ||
                      mgmt_get_connectable(hdev);

        if (!is_advertising_allowed(hdev, connectable))
                return -EPERM;

        /* Set require_privacy to true only when non-connectable
         * advertising is used. In that case it is fine to use a
         * non-resolvable private address.
         */
        err = hci_get_random_address(hdev, !connectable,
                                     adv_use_rpa(hdev, flags), adv,
                                     &own_addr_type, &random_addr);
        if (err < 0)
                return err;

        memset(&cp, 0, sizeof(cp));

        if (adv) {
                hci_cpu_to_le24(adv->min_interval, cp.min_interval);
                hci_cpu_to_le24(adv->max_interval, cp.max_interval);
                cp.tx_power = adv->tx_power;
        } else {
                hci_cpu_to_le24(hdev->le_adv_min_interval, cp.min_interval);
                hci_cpu_to_le24(hdev->le_adv_max_interval, cp.max_interval);
                cp.tx_power = HCI_ADV_TX_POWER_NO_PREFERENCE;
        }

        secondary_adv = (flags & MGMT_ADV_FLAG_SEC_MASK);

        if (connectable) {
                if (secondary_adv)
                        cp.evt_properties = cpu_to_le16(LE_EXT_ADV_CONN_IND);
                else
                        cp.evt_properties = cpu_to_le16(LE_LEGACY_ADV_IND);
        } else if (hci_adv_instance_is_scannable(hdev, instance) ||
                   (flags & MGMT_ADV_PARAM_SCAN_RSP)) {
                if (secondary_adv)
                        cp.evt_properties = cpu_to_le16(LE_EXT_ADV_SCAN_IND);
                else
                        cp.evt_properties = cpu_to_le16(LE_LEGACY_ADV_SCAN_IND);
        } else {
                if (secondary_adv)
                        cp.evt_properties = cpu_to_le16(LE_EXT_ADV_NON_CONN_IND);
                else
                        cp.evt_properties = cpu_to_le16(LE_LEGACY_NONCONN_IND);
        }

        /* If Own_Address_Type equals 0x02 or 0x03, the Peer_Address parameter
         * contains the peer’s Identity Address and the Peer_Address_Type
         * parameter contains the peer’s Identity Type (i.e., 0x00 or 0x01).
         * These parameters are used to locate the corresponding local IRK in
         * the resolving list; this IRK is used to generate their own address
         * used in the advertisement.
         */
        if (own_addr_type == ADDR_LE_DEV_RANDOM_RESOLVED)
                hci_copy_identity_address(hdev, &cp.peer_addr,
                                          &cp.peer_addr_type);

        cp.own_addr_type = own_addr_type;
        cp.channel_map = hdev->le_adv_channel_map;
        cp.handle = instance;

        if (flags & MGMT_ADV_FLAG_SEC_2M) {
                cp.primary_phy = HCI_ADV_PHY_1M;
                cp.secondary_phy = HCI_ADV_PHY_2M;
        } else if (flags & MGMT_ADV_FLAG_SEC_CODED) {
                cp.primary_phy = HCI_ADV_PHY_CODED;
                cp.secondary_phy = HCI_ADV_PHY_CODED;
        } else {
                /* In all other cases use 1M */
                cp.primary_phy = HCI_ADV_PHY_1M;
                cp.secondary_phy = HCI_ADV_PHY_1M;
        }

        err = __hci_cmd_sync_status(hdev, HCI_OP_LE_SET_EXT_ADV_PARAMS,
                                    sizeof(cp), &cp, HCI_CMD_TIMEOUT);
        if (err)
                return err;

        if ((own_addr_type == ADDR_LE_DEV_RANDOM ||
             own_addr_type == ADDR_LE_DEV_RANDOM_RESOLVED) &&
            bacmp(&random_addr, BDADDR_ANY)) {
                /* Check if random address need to be updated */
                if (adv) {
                        if (!bacmp(&random_addr, &adv->random_addr))
                                return 0;
                } else {
                        if (!bacmp(&random_addr, &hdev->random_addr))
                                return 0;
                }

                return hci_set_adv_set_random_addr_sync(hdev, instance,
                                                        &random_addr);
        }

        return 0;
}

static int hci_set_ext_scan_rsp_data_sync(struct hci_dev *hdev, u8 instance)
{
        struct {
                struct hci_cp_le_set_ext_scan_rsp_data cp;
                u8 data[HCI_MAX_EXT_AD_LENGTH];
        } pdu;
        u8 len;
        struct adv_info *adv = NULL;
        int err;

        memset(&pdu, 0, sizeof(pdu));

        if (instance) {
                adv = hci_find_adv_instance(hdev, instance);
                if (!adv || !adv->scan_rsp_changed)
                        return 0;
        }

        len = eir_create_scan_rsp(hdev, instance, pdu.data);

        pdu.cp.handle = instance;
        pdu.cp.length = len;
        pdu.cp.operation = LE_SET_ADV_DATA_OP_COMPLETE;
        pdu.cp.frag_pref = LE_SET_ADV_DATA_NO_FRAG;

        err = __hci_cmd_sync_status(hdev, HCI_OP_LE_SET_EXT_SCAN_RSP_DATA,
                                    sizeof(pdu.cp) + len, &pdu.cp,
                                    HCI_CMD_TIMEOUT);
        if (err)
                return err;

        if (adv) {
                adv->scan_rsp_changed = false;
        } else {
                memcpy(hdev->scan_rsp_data, pdu.data, len);
                hdev->scan_rsp_data_len = len;
        }

        return 0;
}

static int __hci_set_scan_rsp_data_sync(struct hci_dev *hdev, u8 instance)
{
        struct hci_cp_le_set_scan_rsp_data cp;
        u8 len;

        memset(&cp, 0, sizeof(cp));

        len = eir_create_scan_rsp(hdev, instance, cp.data);

        if (hdev->scan_rsp_data_len == len &&
            !memcmp(cp.data, hdev->scan_rsp_data, len))
                return 0;

        memcpy(hdev->scan_rsp_data, cp.data, sizeof(cp.data));
        hdev->scan_rsp_data_len = len;

        cp.length = len;

        return __hci_cmd_sync_status(hdev, HCI_OP_LE_SET_SCAN_RSP_DATA,
                                     sizeof(cp), &cp, HCI_CMD_TIMEOUT);
}

int hci_update_scan_rsp_data_sync(struct hci_dev *hdev, u8 instance)
{
        if (!hci_dev_test_flag(hdev, HCI_LE_ENABLED))
                return 0;

        if (ext_adv_capable(hdev))
                return hci_set_ext_scan_rsp_data_sync(hdev, instance);

        return __hci_set_scan_rsp_data_sync(hdev, instance);
}

int hci_enable_ext_advertising_sync(struct hci_dev *hdev, u8 instance)
{
        struct hci_cp_le_set_ext_adv_enable *cp;
        struct hci_cp_ext_adv_set *set;
        u8 data[sizeof(*cp) + sizeof(*set) * 1];
        struct adv_info *adv;

        if (instance > 0) {
                adv = hci_find_adv_instance(hdev, instance);
                if (!adv)
                        return -EINVAL;
                /* If already enabled there is nothing to do */
                if (adv->enabled)
                        return 0;
        } else {
                adv = NULL;
        }

        cp = (void *)data;
        set = (void *)cp->data;

        memset(cp, 0, sizeof(*cp));

        cp->enable = 0x01;
        cp->num_of_sets = 0x01;

        memset(set, 0, sizeof(*set));

        set->handle = instance;

        /* Set duration per instance since controller is responsible for
         * scheduling it.
         */
        if (adv && adv->timeout) {
                u16 duration = adv->timeout * MSEC_PER_SEC;

                /* Time = N * 10 ms */
                set->duration = cpu_to_le16(duration / 10);
        }

        return __hci_cmd_sync_status(hdev, HCI_OP_LE_SET_EXT_ADV_ENABLE,
                                     sizeof(*cp) +
                                     sizeof(*set) * cp->num_of_sets,
                                     data, HCI_CMD_TIMEOUT);
}

int hci_start_ext_adv_sync(struct hci_dev *hdev, u8 instance)
{
        int err;

        err = hci_setup_ext_adv_instance_sync(hdev, instance);
        if (err)
                return err;

        err = hci_set_ext_scan_rsp_data_sync(hdev, instance);
        if (err)
                return err;

        return hci_enable_ext_advertising_sync(hdev, instance);
}

static int hci_disable_per_advertising_sync(struct hci_dev *hdev, u8 instance)
{
        struct hci_cp_le_set_per_adv_enable cp;

        /* If periodic advertising already disabled there is nothing to do. */
        if (!hci_dev_test_flag(hdev, HCI_LE_PER_ADV))
                return 0;

        memset(&cp, 0, sizeof(cp));

        cp.enable = 0x00;
        cp.handle = instance;

        return __hci_cmd_sync_status(hdev, HCI_OP_LE_SET_PER_ADV_ENABLE,
                                     sizeof(cp), &cp, HCI_CMD_TIMEOUT);
}

static int hci_set_per_adv_params_sync(struct hci_dev *hdev, u8 instance,
                                       u16 min_interval, u16 max_interval)
{
        struct hci_cp_le_set_per_adv_params cp;

        memset(&cp, 0, sizeof(cp));

        if (!min_interval)
                min_interval = DISCOV_LE_PER_ADV_INT_MIN;

        if (!max_interval)
                max_interval = DISCOV_LE_PER_ADV_INT_MAX;

        cp.handle = instance;
        cp.min_interval = cpu_to_le16(min_interval);
        cp.max_interval = cpu_to_le16(max_interval);
        cp.periodic_properties = 0x0000;

        return __hci_cmd_sync_status(hdev, HCI_OP_LE_SET_PER_ADV_PARAMS,
                                     sizeof(cp), &cp, HCI_CMD_TIMEOUT);
}

static int hci_set_per_adv_data_sync(struct hci_dev *hdev, u8 instance)
{
        struct {
                struct hci_cp_le_set_per_adv_data cp;
                u8 data[HCI_MAX_PER_AD_LENGTH];
        } pdu;
        u8 len;

        memset(&pdu, 0, sizeof(pdu));

        if (instance) {
                struct adv_info *adv = hci_find_adv_instance(hdev, instance);

                if (!adv || !adv->periodic)
                        return 0;
        }

        len = eir_create_per_adv_data(hdev, instance, pdu.data);

        pdu.cp.length = len;
        pdu.cp.handle = instance;
        pdu.cp.operation = LE_SET_ADV_DATA_OP_COMPLETE;

        return __hci_cmd_sync_status(hdev, HCI_OP_LE_SET_PER_ADV_DATA,
                                     sizeof(pdu.cp) + len, &pdu,
                                     HCI_CMD_TIMEOUT);
}

static int hci_enable_per_advertising_sync(struct hci_dev *hdev, u8 instance)
{
        struct hci_cp_le_set_per_adv_enable cp;

        /* If periodic advertising already enabled there is nothing to do. */
        if (hci_dev_test_flag(hdev, HCI_LE_PER_ADV))
                return 0;

        memset(&cp, 0, sizeof(cp));

        cp.enable = 0x01;
        cp.handle = instance;

        return __hci_cmd_sync_status(hdev, HCI_OP_LE_SET_PER_ADV_ENABLE,
                                     sizeof(cp), &cp, HCI_CMD_TIMEOUT);
}

/* Checks if periodic advertising data contains a Basic Announcement and if it
 * does generates a Broadcast ID and add Broadcast Announcement.
 */
static int hci_adv_bcast_annoucement(struct hci_dev *hdev, struct adv_info *adv)
{
        u8 bid[3];
        u8 ad[4 + 3];

        /* Skip if NULL adv as instance 0x00 is used for general purpose
         * advertising so it cannot used for the likes of Broadcast Announcement
         * as it can be overwritten at any point.
         */
        if (!adv)
                return 0;

        /* Check if PA data doesn't contains a Basic Audio Announcement then
         * there is nothing to do.
         */
        if (!eir_get_service_data(adv->per_adv_data, adv->per_adv_data_len,
                                  0x1851, NULL))
                return 0;

        /* Check if advertising data already has a Broadcast Announcement since
         * the process may want to control the Broadcast ID directly and in that
         * case the kernel shall no interfere.
         */
        if (eir_get_service_data(adv->adv_data, adv->adv_data_len, 0x1852,
                                 NULL))
                return 0;

        /* Generate Broadcast ID */
        get_random_bytes(bid, sizeof(bid));
        eir_append_service_data(ad, 0, 0x1852, bid, sizeof(bid));
        hci_set_adv_instance_data(hdev, adv->instance, sizeof(ad), ad, 0, NULL);

        return hci_update_adv_data_sync(hdev, adv->instance);
}

int hci_start_per_adv_sync(struct hci_dev *hdev, u8 instance, u8 data_len,
                           u8 *data, u32 flags, u16 min_interval,
                           u16 max_interval, u16 sync_interval)
{
        struct adv_info *adv = NULL;
        int err;
        bool added = false;

        hci_disable_per_advertising_sync(hdev, instance);

        if (instance) {
                adv = hci_find_adv_instance(hdev, instance);
                /* Create an instance if that could not be found */
                if (!adv) {
                        adv = hci_add_per_instance(hdev, instance, flags,
                                                   data_len, data,
                                                   sync_interval,
                                                   sync_interval);
                        if (IS_ERR(adv))
                                return PTR_ERR(adv);
                        added = true;
                }
        }

        /* Only start advertising if instance 0 or if a dedicated instance has
         * been added.
         */
        if (!adv || added) {
                err = hci_start_ext_adv_sync(hdev, instance);
                if (err < 0)
                        goto fail;

                err = hci_adv_bcast_annoucement(hdev, adv);
                if (err < 0)
                        goto fail;
        }

        err = hci_set_per_adv_params_sync(hdev, instance, min_interval,
                                          max_interval);
        if (err < 0)
                goto fail;

        err = hci_set_per_adv_data_sync(hdev, instance);
        if (err < 0)
                goto fail;

        err = hci_enable_per_advertising_sync(hdev, instance);
        if (err < 0)
                goto fail;

        return 0;

fail:
        if (added)
                hci_remove_adv_instance(hdev, instance);

        return err;
}

static int hci_start_adv_sync(struct hci_dev *hdev, u8 instance)
{
        int err;

        if (ext_adv_capable(hdev))
                return hci_start_ext_adv_sync(hdev, instance);

        err = hci_update_adv_data_sync(hdev, instance);
        if (err)
                return err;

        err = hci_update_scan_rsp_data_sync(hdev, instance);
        if (err)
                return err;

        return hci_enable_advertising_sync(hdev);
}

int hci_enable_advertising_sync(struct hci_dev *hdev)
{
        struct adv_info *adv_instance;
        struct hci_cp_le_set_adv_param cp;
        u8 own_addr_type, enable = 0x01;
        bool connectable;
        u16 adv_min_interval, adv_max_interval;
        u32 flags;
        u8 status;

        if (ext_adv_capable(hdev))
                return hci_enable_ext_advertising_sync(hdev,
                                                       hdev->cur_adv_instance);

        flags = hci_adv_instance_flags(hdev, hdev->cur_adv_instance);
        adv_instance = hci_find_adv_instance(hdev, hdev->cur_adv_instance);

        /* If the "connectable" instance flag was not set, then choose between
         * ADV_IND and ADV_NONCONN_IND based on the global connectable setting.
         */
        connectable = (flags & MGMT_ADV_FLAG_CONNECTABLE) ||
                      mgmt_get_connectable(hdev);

        if (!is_advertising_allowed(hdev, connectable))
                return -EINVAL;

        status = hci_disable_advertising_sync(hdev);
        if (status)
                return status;

        /* Clear the HCI_LE_ADV bit temporarily so that the
         * hci_update_random_address knows that it's safe to go ahead
         * and write a new random address. The flag will be set back on
         * as soon as the SET_ADV_ENABLE HCI command completes.
         */
        hci_dev_clear_flag(hdev, HCI_LE_ADV);

        /* Set require_privacy to true only when non-connectable
         * advertising is used. In that case it is fine to use a
         * non-resolvable private address.
         */
        status = hci_update_random_address_sync(hdev, !connectable,
                                                adv_use_rpa(hdev, flags),
                                                &own_addr_type);
        if (status)
                return status;

        memset(&cp, 0, sizeof(cp));

        if (adv_instance) {
                adv_min_interval = adv_instance->min_interval;
                adv_max_interval = adv_instance->max_interval;
        } else {
                adv_min_interval = hdev->le_adv_min_interval;
                adv_max_interval = hdev->le_adv_max_interval;
        }

        if (connectable) {
                cp.type = LE_ADV_IND;
        } else {
                if (hci_adv_instance_is_scannable(hdev, hdev->cur_adv_instance))
                        cp.type = LE_ADV_SCAN_IND;
                else
                        cp.type = LE_ADV_NONCONN_IND;

                if (!hci_dev_test_flag(hdev, HCI_DISCOVERABLE) ||
                    hci_dev_test_flag(hdev, HCI_LIMITED_DISCOVERABLE)) {
                        adv_min_interval = DISCOV_LE_FAST_ADV_INT_MIN;
                        adv_max_interval = DISCOV_LE_FAST_ADV_INT_MAX;
                }
        }

        cp.min_interval = cpu_to_le16(adv_min_interval);
        cp.max_interval = cpu_to_le16(adv_max_interval);
        cp.own_address_type = own_addr_type;
        cp.channel_map = hdev->le_adv_channel_map;

        status = __hci_cmd_sync_status(hdev, HCI_OP_LE_SET_ADV_PARAM,
                                       sizeof(cp), &cp, HCI_CMD_TIMEOUT);
        if (status)
                return status;

        return __hci_cmd_sync_status(hdev, HCI_OP_LE_SET_ADV_ENABLE,
                                     sizeof(enable), &enable, HCI_CMD_TIMEOUT);
}

static int enable_advertising_sync(struct hci_dev *hdev, void *data)
{
        return hci_enable_advertising_sync(hdev);
}

int hci_enable_advertising(struct hci_dev *hdev)
{
        if (!hci_dev_test_flag(hdev, HCI_ADVERTISING) &&
            list_empty(&hdev->adv_instances))
                return 0;

        return hci_cmd_sync_queue(hdev, enable_advertising_sync, NULL, NULL);
}

int hci_remove_ext_adv_instance_sync(struct hci_dev *hdev, u8 instance,
                                     struct sock *sk)
{
        int err;

        if (!ext_adv_capable(hdev))
                return 0;

        err = hci_disable_ext_adv_instance_sync(hdev, instance);
        if (err)
                return err;

        /* If request specifies an instance that doesn't exist, fail */
        if (instance > 0 && !hci_find_adv_instance(hdev, instance))
                return -EINVAL;

        return __hci_cmd_sync_status_sk(hdev, HCI_OP_LE_REMOVE_ADV_SET,
                                        sizeof(instance), &instance, 0,
                                        HCI_CMD_TIMEOUT, sk);
}

static int remove_ext_adv_sync(struct hci_dev *hdev, void *data)
{
        struct adv_info *adv = data;
        u8 instance = 0;

        if (adv)
                instance = adv->instance;

        return hci_remove_ext_adv_instance_sync(hdev, instance, NULL);
}

int hci_remove_ext_adv_instance(struct hci_dev *hdev, u8 instance)
{
        struct adv_info *adv = NULL;

        if (instance) {
                adv = hci_find_adv_instance(hdev, instance);
                if (!adv)
                        return -EINVAL;
        }

        return hci_cmd_sync_queue(hdev, remove_ext_adv_sync, adv, NULL);
}

int hci_le_terminate_big_sync(struct hci_dev *hdev, u8 handle, u8 reason)
{
        struct hci_cp_le_term_big cp;

        memset(&cp, 0, sizeof(cp));
        cp.handle = handle;
        cp.reason = reason;

        return __hci_cmd_sync_status(hdev, HCI_OP_LE_TERM_BIG,
                                     sizeof(cp), &cp, HCI_CMD_TIMEOUT);
}

static int hci_set_ext_adv_data_sync(struct hci_dev *hdev, u8 instance)
{
        struct {
                struct hci_cp_le_set_ext_adv_data cp;
                u8 data[HCI_MAX_EXT_AD_LENGTH];
        } pdu;
        u8 len;
        struct adv_info *adv = NULL;
        int err;

        memset(&pdu, 0, sizeof(pdu));

        if (instance) {
                adv = hci_find_adv_instance(hdev, instance);
                if (!adv || !adv->adv_data_changed)
                        return 0;
        }

        len = eir_create_adv_data(hdev, instance, pdu.data);

        pdu.cp.length = len;
        pdu.cp.handle = instance;
        pdu.cp.operation = LE_SET_ADV_DATA_OP_COMPLETE;
        pdu.cp.frag_pref = LE_SET_ADV_DATA_NO_FRAG;

        err = __hci_cmd_sync_status(hdev, HCI_OP_LE_SET_EXT_ADV_DATA,
                                    sizeof(pdu.cp) + len, &pdu.cp,
                                    HCI_CMD_TIMEOUT);
        if (err)
                return err;

        /* Update data if the command succeed */
        if (adv) {
                adv->adv_data_changed = false;
        } else {
                memcpy(hdev->adv_data, pdu.data, len);
                hdev->adv_data_len = len;
        }

        return 0;
}

static int hci_set_adv_data_sync(struct hci_dev *hdev, u8 instance)
{
        struct hci_cp_le_set_adv_data cp;
        u8 len;

        memset(&cp, 0, sizeof(cp));

        len = eir_create_adv_data(hdev, instance, cp.data);

        /* There's nothing to do if the data hasn't changed */
        if (hdev->adv_data_len == len &&
            memcmp(cp.data, hdev->adv_data, len) == 0)
                return 0;

        memcpy(hdev->adv_data, cp.data, sizeof(cp.data));
        hdev->adv_data_len = len;

        cp.length = len;

        return __hci_cmd_sync_status(hdev, HCI_OP_LE_SET_ADV_DATA,
                                     sizeof(cp), &cp, HCI_CMD_TIMEOUT);
}

int hci_update_adv_data_sync(struct hci_dev *hdev, u8 instance)
{
        if (!hci_dev_test_flag(hdev, HCI_LE_ENABLED))
                return 0;

        if (ext_adv_capable(hdev))
                return hci_set_ext_adv_data_sync(hdev, instance);

        return hci_set_adv_data_sync(hdev, instance);
}

int hci_schedule_adv_instance_sync(struct hci_dev *hdev, u8 instance,
                                   bool force)
{
        struct adv_info *adv = NULL;
        u16 timeout;

        if (hci_dev_test_flag(hdev, HCI_ADVERTISING) && !ext_adv_capable(hdev))
                return -EPERM;

        if (hdev->adv_instance_timeout)
                return -EBUSY;

        adv = hci_find_adv_instance(hdev, instance);
        if (!adv)
                return -ENOENT;

        /* A zero timeout means unlimited advertising. As long as there is
         * only one instance, duration should be ignored. We still set a timeout
         * in case further instances are being added later on.
         *
         * If the remaining lifetime of the instance is more than the duration
         * then the timeout corresponds to the duration, otherwise it will be
         * reduced to the remaining instance lifetime.
         */
        if (adv->timeout == 0 || adv->duration <= adv->remaining_time)
                timeout = adv->duration;
        else
                timeout = adv->remaining_time;

        /* The remaining time is being reduced unless the instance is being
         * advertised without time limit.
         */
        if (adv->timeout)
                adv->remaining_time = adv->remaining_time - timeout;

        /* Only use work for scheduling instances with legacy advertising */
        if (!ext_adv_capable(hdev)) {
                hdev->adv_instance_timeout = timeout;
                queue_delayed_work(hdev->req_workqueue,
                                   &hdev->adv_instance_expire,
                                   msecs_to_jiffies(timeout * 1000));
        }

        /* If we're just re-scheduling the same instance again then do not
         * execute any HCI commands. This happens when a single instance is
         * being advertised.
         */
        if (!force && hdev->cur_adv_instance == instance &&
            hci_dev_test_flag(hdev, HCI_LE_ADV))
                return 0;

        hdev->cur_adv_instance = instance;

        return hci_start_adv_sync(hdev, instance);
}

static int hci_clear_adv_sets_sync(struct hci_dev *hdev, struct sock *sk)
{
        int err;

        if (!ext_adv_capable(hdev))
                return 0;

        /* Disable instance 0x00 to disable all instances */
        err = hci_disable_ext_adv_instance_sync(hdev, 0x00);
        if (err)
                return err;

        return __hci_cmd_sync_status_sk(hdev, HCI_OP_LE_CLEAR_ADV_SETS,
                                        0, NULL, 0, HCI_CMD_TIMEOUT, sk);
}

static int hci_clear_adv_sync(struct hci_dev *hdev, struct sock *sk, bool force)
{
        struct adv_info *adv, *n;
        int err = 0;

        if (ext_adv_capable(hdev))
                /* Remove all existing sets */
                err = hci_clear_adv_sets_sync(hdev, sk);
        if (ext_adv_capable(hdev))
                return err;

        /* This is safe as long as there is no command send while the lock is
         * held.
         */
        hci_dev_lock(hdev);

        /* Cleanup non-ext instances */
        list_for_each_entry_safe(adv, n, &hdev->adv_instances, list) {
                u8 instance = adv->instance;
                int err;

                if (!(force || adv->timeout))
                        continue;

                err = hci_remove_adv_instance(hdev, instance);
                if (!err)
                        mgmt_advertising_removed(sk, hdev, instance);
        }

        hci_dev_unlock(hdev);

        return 0;
}

static int hci_remove_adv_sync(struct hci_dev *hdev, u8 instance,
                               struct sock *sk)
{
        int err = 0;

        /* If we use extended advertising, instance has to be removed first. */
        if (ext_adv_capable(hdev))
                err = hci_remove_ext_adv_instance_sync(hdev, instance, sk);
        if (ext_adv_capable(hdev))
                return err;

        /* This is safe as long as there is no command send while the lock is
         * held.
         */
        hci_dev_lock(hdev);

        err = hci_remove_adv_instance(hdev, instance);
        if (!err)
                mgmt_advertising_removed(sk, hdev, instance);

        hci_dev_unlock(hdev);

        return err;
}

/* For a single instance:
 * - force == true: The instance will be removed even when its remaining
 *   lifetime is not zero.
 * - force == false: the instance will be deactivated but kept stored unless
 *   the remaining lifetime is zero.
 *
 * For instance == 0x00:
 * - force == true: All instances will be removed regardless of their timeout
 *   setting.
 * - force == false: Only instances that have a timeout will be removed.
 */
int hci_remove_advertising_sync(struct hci_dev *hdev, struct sock *sk,
                                u8 instance, bool force)
{
        struct adv_info *next = NULL;
        int err;

        /* Cancel any timeout concerning the removed instance(s). */
        if (!instance || hdev->cur_adv_instance == instance)
                cancel_adv_timeout(hdev);

        /* Get the next instance to advertise BEFORE we remove
         * the current one. This can be the same instance again
         * if there is only one instance.
         */
        if (hdev->cur_adv_instance == instance)
                next = hci_get_next_instance(hdev, instance);

        if (!instance) {
                err = hci_clear_adv_sync(hdev, sk, force);
                if (err)
                        return err;
        } else {
                struct adv_info *adv = hci_find_adv_instance(hdev, instance);

                if (force || (adv && adv->timeout && !adv->remaining_time)) {
                        /* Don't advertise a removed instance. */
                        if (next && next->instance == instance)
                                next = NULL;

                        err = hci_remove_adv_sync(hdev, instance, sk);
                        if (err)
                                return err;
                }
        }

        if (!hdev_is_powered(hdev) || hci_dev_test_flag(hdev, HCI_ADVERTISING))
                return 0;

        if (next && !ext_adv_capable(hdev))
                hci_schedule_adv_instance_sync(hdev, next->instance, false);

        return 0;
}

int hci_read_rssi_sync(struct hci_dev *hdev, __le16 handle)
{
        struct hci_cp_read_rssi cp;

        cp.handle = handle;
        return __hci_cmd_sync_status(hdev, HCI_OP_READ_RSSI,
                                        sizeof(cp), &cp, HCI_CMD_TIMEOUT);
}

int hci_read_clock_sync(struct hci_dev *hdev, struct hci_cp_read_clock *cp)
{
        return __hci_cmd_sync_status(hdev, HCI_OP_READ_CLOCK,
                                        sizeof(*cp), cp, HCI_CMD_TIMEOUT);
}

int hci_read_tx_power_sync(struct hci_dev *hdev, __le16 handle, u8 type)
{
        struct hci_cp_read_tx_power cp;

        cp.handle = handle;
        cp.type = type;
        return __hci_cmd_sync_status(hdev, HCI_OP_READ_TX_POWER,
                                        sizeof(cp), &cp, HCI_CMD_TIMEOUT);
}

int hci_disable_advertising_sync(struct hci_dev *hdev)
{
        u8 enable = 0x00;
        int err = 0;

        /* If controller is not advertising we are done. */
        if (!hci_dev_test_flag(hdev, HCI_LE_ADV))
                return 0;

        if (ext_adv_capable(hdev))
                err = hci_disable_ext_adv_instance_sync(hdev, 0x00);
        if (ext_adv_capable(hdev))
                return err;

        return __hci_cmd_sync_status(hdev, HCI_OP_LE_SET_ADV_ENABLE,
                                     sizeof(enable), &enable, HCI_CMD_TIMEOUT);
}

static int hci_le_set_ext_scan_enable_sync(struct hci_dev *hdev, u8 val,
                                           u8 filter_dup)
{
        struct hci_cp_le_set_ext_scan_enable cp;

        memset(&cp, 0, sizeof(cp));
        cp.enable = val;

        if (hci_dev_test_flag(hdev, HCI_MESH))
                cp.filter_dup = LE_SCAN_FILTER_DUP_DISABLE;
        else
                cp.filter_dup = filter_dup;

        return __hci_cmd_sync_status(hdev, HCI_OP_LE_SET_EXT_SCAN_ENABLE,
                                     sizeof(cp), &cp, HCI_CMD_TIMEOUT);
}

static int hci_le_set_scan_enable_sync(struct hci_dev *hdev, u8 val,
                                       u8 filter_dup)
{
        struct hci_cp_le_set_scan_enable cp;

        if (use_ext_scan(hdev))
                return hci_le_set_ext_scan_enable_sync(hdev, val, filter_dup);

        memset(&cp, 0, sizeof(cp));
        cp.enable = val;

        if (val && hci_dev_test_flag(hdev, HCI_MESH))
                cp.filter_dup = LE_SCAN_FILTER_DUP_DISABLE;
        else
                cp.filter_dup = filter_dup;

        return __hci_cmd_sync_status(hdev, HCI_OP_LE_SET_SCAN_ENABLE,
                                     sizeof(cp), &cp, HCI_CMD_TIMEOUT);
}

static int hci_le_set_addr_resolution_enable_sync(struct hci_dev *hdev, u8 val)
{
        if (!use_ll_privacy(hdev))
                return 0;

        /* If controller is not/already resolving we are done. */
        if (val == hci_dev_test_flag(hdev, HCI_LL_RPA_RESOLUTION))
                return 0;

        return __hci_cmd_sync_status(hdev, HCI_OP_LE_SET_ADDR_RESOLV_ENABLE,
                                     sizeof(val), &val, HCI_CMD_TIMEOUT);
}

static int hci_scan_disable_sync(struct hci_dev *hdev)
{
        int err;

        /* If controller is not scanning we are done. */
        if (!hci_dev_test_flag(hdev, HCI_LE_SCAN))
                return 0;

        if (hdev->scanning_paused) {
                bt_dev_dbg(hdev, "Scanning is paused for suspend");
                return 0;
        }

        err = hci_le_set_scan_enable_sync(hdev, LE_SCAN_DISABLE, 0x00);
        if (err) {
                bt_dev_err(hdev, "Unable to disable scanning: %d", err);
                return err;
        }

        return err;
}

static bool scan_use_rpa(struct hci_dev *hdev)
{
        return hci_dev_test_flag(hdev, HCI_PRIVACY);
}

static void hci_start_interleave_scan(struct hci_dev *hdev)
{
        hdev->interleave_scan_state = INTERLEAVE_SCAN_NO_FILTER;
        queue_delayed_work(hdev->req_workqueue,
                           &hdev->interleave_scan, 0);
}

static bool is_interleave_scanning(struct hci_dev *hdev)
{
        return hdev->interleave_scan_state != INTERLEAVE_SCAN_NONE;
}

static void cancel_interleave_scan(struct hci_dev *hdev)
{
        bt_dev_dbg(hdev, "cancelling interleave scan");

        cancel_delayed_work_sync(&hdev->interleave_scan);

        hdev->interleave_scan_state = INTERLEAVE_SCAN_NONE;
}

/* Return true if interleave_scan wasn't started until exiting this function,
 * otherwise, return false
 */
static bool hci_update_interleaved_scan_sync(struct hci_dev *hdev)
{
        /* Do interleaved scan only if all of the following are true:
         * - There is at least one ADV monitor
         * - At least one pending LE connection or one device to be scanned for
         * - Monitor offloading is not supported
         * If so, we should alternate between allowlist scan and one without
         * any filters to save power.
         */
        bool use_interleaving = hci_is_adv_monitoring(hdev) &&
                                !(list_empty(&hdev->pend_le_conns) &&
                                  list_empty(&hdev->pend_le_reports)) &&
                                hci_get_adv_monitor_offload_ext(hdev) ==
                                    HCI_ADV_MONITOR_EXT_NONE;
        bool is_interleaving = is_interleave_scanning(hdev);

        if (use_interleaving && !is_interleaving) {
                hci_start_interleave_scan(hdev);
                bt_dev_dbg(hdev, "starting interleave scan");
                return true;
        }

        if (!use_interleaving && is_interleaving)
                cancel_interleave_scan(hdev);

        return false;
}

/* Removes connection to resolve list if needed.*/
static int hci_le_del_resolve_list_sync(struct hci_dev *hdev,
                                        bdaddr_t *bdaddr, u8 bdaddr_type)
{
        struct hci_cp_le_del_from_resolv_list cp;
        struct bdaddr_list_with_irk *entry;

        if (!use_ll_privacy(hdev))
                return 0;

        /* Check if the IRK has been programmed */
        entry = hci_bdaddr_list_lookup_with_irk(&hdev->le_resolv_list, bdaddr,
                                                bdaddr_type);
        if (!entry)
                return 0;

        cp.bdaddr_type = bdaddr_type;
        bacpy(&cp.bdaddr, bdaddr);

        return __hci_cmd_sync_status(hdev, HCI_OP_LE_DEL_FROM_RESOLV_LIST,
                                     sizeof(cp), &cp, HCI_CMD_TIMEOUT);
}

static int hci_le_del_accept_list_sync(struct hci_dev *hdev,
                                       bdaddr_t *bdaddr, u8 bdaddr_type)
{
        struct hci_cp_le_del_from_accept_list cp;
        int err;

        /* Check if device is on accept list before removing it */
        if (!hci_bdaddr_list_lookup(&hdev->le_accept_list, bdaddr, bdaddr_type))
                return 0;

        cp.bdaddr_type = bdaddr_type;
        bacpy(&cp.bdaddr, bdaddr);

        /* Ignore errors when removing from resolving list as that is likely
         * that the device was never added.
         */
        hci_le_del_resolve_list_sync(hdev, &cp.bdaddr, cp.bdaddr_type);

        err = __hci_cmd_sync_status(hdev, HCI_OP_LE_DEL_FROM_ACCEPT_LIST,
                                    sizeof(cp), &cp, HCI_CMD_TIMEOUT);
        if (err) {
                bt_dev_err(hdev, "Unable to remove from allow list: %d", err);
                return err;
        }

        bt_dev_dbg(hdev, "Remove %pMR (0x%x) from allow list", &cp.bdaddr,
                   cp.bdaddr_type);

        return 0;
}

/* Adds connection to resolve list if needed.
 * Setting params to NULL programs local hdev->irk
 */
static int hci_le_add_resolve_list_sync(struct hci_dev *hdev,
                                        struct hci_conn_params *params)
{
        struct hci_cp_le_add_to_resolv_list cp;
        struct smp_irk *irk;
        struct bdaddr_list_with_irk *entry;

        if (!use_ll_privacy(hdev))
                return 0;

        /* Attempt to program local identity address, type and irk if params is
         * NULL.
         */
        if (!params) {
                if (!hci_dev_test_flag(hdev, HCI_PRIVACY))
                        return 0;

                hci_copy_identity_address(hdev, &cp.bdaddr, &cp.bdaddr_type);
                memcpy(cp.peer_irk, hdev->irk, 16);
                goto done;
        }

        irk = hci_find_irk_by_addr(hdev, &params->addr, params->addr_type);
        if (!irk)
                return 0;

        /* Check if the IK has _not_ been programmed yet. */
        entry = hci_bdaddr_list_lookup_with_irk(&hdev->le_resolv_list,
                                                &params->addr,
                                                params->addr_type);
        if (entry)
                return 0;

        cp.bdaddr_type = params->addr_type;
        bacpy(&cp.bdaddr, &params->addr);
        memcpy(cp.peer_irk, irk->val, 16);

        /* Default privacy mode is always Network */
        params->privacy_mode = HCI_NETWORK_PRIVACY;

done:
        if (hci_dev_test_flag(hdev, HCI_PRIVACY))
                memcpy(cp.local_irk, hdev->irk, 16);
        else
                memset(cp.local_irk, 0, 16);

        return __hci_cmd_sync_status(hdev, HCI_OP_LE_ADD_TO_RESOLV_LIST,
                                     sizeof(cp), &cp, HCI_CMD_TIMEOUT);
}

/* Set Device Privacy Mode. */
static int hci_le_set_privacy_mode_sync(struct hci_dev *hdev,
                                        struct hci_conn_params *params)
{
        struct hci_cp_le_set_privacy_mode cp;
        struct smp_irk *irk;

        /* If device privacy mode has already been set there is nothing to do */
        if (params->privacy_mode == HCI_DEVICE_PRIVACY)
                return 0;

        /* Check if HCI_CONN_FLAG_DEVICE_PRIVACY has been set as it also
         * indicates that LL Privacy has been enabled and
         * HCI_OP_LE_SET_PRIVACY_MODE is supported.
         */
        if (!(params->flags & HCI_CONN_FLAG_DEVICE_PRIVACY))
                return 0;

        irk = hci_find_irk_by_addr(hdev, &params->addr, params->addr_type);
        if (!irk)
                return 0;

        memset(&cp, 0, sizeof(cp));
        cp.bdaddr_type = irk->addr_type;
        bacpy(&cp.bdaddr, &irk->bdaddr);
        cp.mode = HCI_DEVICE_PRIVACY;

        return __hci_cmd_sync_status(hdev, HCI_OP_LE_SET_PRIVACY_MODE,
                                     sizeof(cp), &cp, HCI_CMD_TIMEOUT);
}

/* Adds connection to allow list if needed, if the device uses RPA (has IRK)
 * this attempts to program the device in the resolving list as well and
 * properly set the privacy mode.
 */
static int hci_le_add_accept_list_sync(struct hci_dev *hdev,
                                       struct hci_conn_params *params,
                                       u8 *num_entries)
{
        struct hci_cp_le_add_to_accept_list cp;
        int err;

        /* During suspend, only wakeable devices can be in acceptlist */
        if (hdev->suspended &&
            !(params->flags & HCI_CONN_FLAG_REMOTE_WAKEUP))
                return 0;

        /* Select filter policy to accept all advertising */
        if (*num_entries >= hdev->le_accept_list_size)
                return -ENOSPC;

        /* Accept list can not be used with RPAs */
        if (!use_ll_privacy(hdev) &&
            hci_find_irk_by_addr(hdev, &params->addr, params->addr_type))
                return -EINVAL;

        /* Attempt to program the device in the resolving list first to avoid
         * having to rollback in case it fails since the resolving list is
         * dynamic it can probably be smaller than the accept list.
         */
        err = hci_le_add_resolve_list_sync(hdev, params);
        if (err) {
                bt_dev_err(hdev, "Unable to add to resolve list: %d", err);
                return err;
        }

        /* Set Privacy Mode */
        err = hci_le_set_privacy_mode_sync(hdev, params);
        if (err) {
                bt_dev_err(hdev, "Unable to set privacy mode: %d", err);
                return err;
        }

        /* Check if already in accept list */
        if (hci_bdaddr_list_lookup(&hdev->le_accept_list, &params->addr,
                                   params->addr_type))
                return 0;

        *num_entries += 1;
        cp.bdaddr_type = params->addr_type;
        bacpy(&cp.bdaddr, &params->addr);

        err = __hci_cmd_sync_status(hdev, HCI_OP_LE_ADD_TO_ACCEPT_LIST,
                                    sizeof(cp), &cp, HCI_CMD_TIMEOUT);
        if (err) {
                bt_dev_err(hdev, "Unable to add to allow list: %d", err);
                /* Rollback the device from the resolving list */
                hci_le_del_resolve_list_sync(hdev, &cp.bdaddr, cp.bdaddr_type);
                return err;
        }

        bt_dev_dbg(hdev, "Add %pMR (0x%x) to allow list", &cp.bdaddr,
                   cp.bdaddr_type);

        return 0;
}

/* This function disables/pause all advertising instances */
static int hci_pause_advertising_sync(struct hci_dev *hdev)
{
        int err;
        int old_state;

        /* If already been paused there is nothing to do. */
        if (hdev->advertising_paused)
                return 0;

        bt_dev_dbg(hdev, "Pausing directed advertising");

        /* Stop directed advertising */
        old_state = hci_dev_test_flag(hdev, HCI_ADVERTISING);
        if (old_state) {
                /* When discoverable timeout triggers, then just make sure
                 * the limited discoverable flag is cleared. Even in the case
                 * of a timeout triggered from general discoverable, it is
                 * safe to unconditionally clear the flag.
                 */
                hci_dev_clear_flag(hdev, HCI_LIMITED_DISCOVERABLE);
                hci_dev_clear_flag(hdev, HCI_DISCOVERABLE);
                hdev->discov_timeout = 0;
        }

        bt_dev_dbg(hdev, "Pausing advertising instances");

        /* Call to disable any advertisements active on the controller.
         * This will succeed even if no advertisements are configured.
         */
        err = hci_disable_advertising_sync(hdev);
        if (err)
                return err;

        /* If we are using software rotation, pause the loop */
        if (!ext_adv_capable(hdev))
                cancel_adv_timeout(hdev);

        hdev->advertising_paused = true;
        hdev->advertising_old_state = old_state;

        return 0;
}

/* This function enables all user advertising instances */
static int hci_resume_advertising_sync(struct hci_dev *hdev)
{
        struct adv_info *adv, *tmp;
        int err;

        /* If advertising has not been paused there is nothing  to do. */
        if (!hdev->advertising_paused)
                return 0;

        /* Resume directed advertising */
        hdev->advertising_paused = false;
        if (hdev->advertising_old_state) {
                hci_dev_set_flag(hdev, HCI_ADVERTISING);
                hdev->advertising_old_state = 0;
        }

        bt_dev_dbg(hdev, "Resuming advertising instances");

        if (ext_adv_capable(hdev)) {
                /* Call for each tracked instance to be re-enabled */
                list_for_each_entry_safe(adv, tmp, &hdev->adv_instances, list) {
                        err = hci_enable_ext_advertising_sync(hdev,
                                                              adv->instance);
                        if (!err)
                                continue;

                        /* If the instance cannot be resumed remove it */
                        hci_remove_ext_adv_instance_sync(hdev, adv->instance,
                                                         NULL);
                }
        } else {
                /* Schedule for most recent instance to be restarted and begin
                 * the software rotation loop
                 */
                err = hci_schedule_adv_instance_sync(hdev,
                                                     hdev->cur_adv_instance,
                                                     true);
        }

        hdev->advertising_paused = false;

        return err;
}

static int hci_pause_addr_resolution(struct hci_dev *hdev)
{
        int err;

        if (!use_ll_privacy(hdev))
                return 0;

        if (!hci_dev_test_flag(hdev, HCI_LL_RPA_RESOLUTION))
                return 0;

        /* Cannot disable addr resolution if scanning is enabled or
         * when initiating an LE connection.
         */
        if (hci_dev_test_flag(hdev, HCI_LE_SCAN) ||
            hci_lookup_le_connect(hdev)) {
                bt_dev_err(hdev, "Command not allowed when scan/LE connect");
                return -EPERM;
        }

        /* Cannot disable addr resolution if advertising is enabled. */
        err = hci_pause_advertising_sync(hdev);
        if (err) {
                bt_dev_err(hdev, "Pause advertising failed: %d", err);
                return err;
        }

        err = hci_le_set_addr_resolution_enable_sync(hdev, 0x00);
        if (err)
                bt_dev_err(hdev, "Unable to disable Address Resolution: %d",
                           err);

        /* Return if address resolution is disabled and RPA is not used. */
        if (!err && scan_use_rpa(hdev))
                return 0;

        hci_resume_advertising_sync(hdev);
        return err;
}

struct sk_buff *hci_read_local_oob_data_sync(struct hci_dev *hdev,
                                             bool extended, struct sock *sk)
{
        u16 opcode = extended ? HCI_OP_READ_LOCAL_OOB_EXT_DATA :
                                        HCI_OP_READ_LOCAL_OOB_DATA;

        return __hci_cmd_sync_sk(hdev, opcode, 0, NULL, 0, HCI_CMD_TIMEOUT, sk);
}

/* Device must not be scanning when updating the accept list.
 *
 * Update is done using the following sequence:
 *
 * use_ll_privacy((Disable Advertising) -> Disable Resolving List) ->
 * Remove Devices From Accept List ->
 * (has IRK && use_ll_privacy(Remove Devices From Resolving List))->
 * Add Devices to Accept List ->
 * (has IRK && use_ll_privacy(Remove Devices From Resolving List)) ->
 * use_ll_privacy(Enable Resolving List -> (Enable Advertising)) ->
 * Enable Scanning
 *
 * In case of failure advertising shall be restored to its original state and
 * return would disable accept list since either accept or resolving list could
 * not be programmed.
 *
 */
static u8 hci_update_accept_list_sync(struct hci_dev *hdev)
{
        struct hci_conn_params *params;
        struct bdaddr_list *b, *t;
        u8 num_entries = 0;
        bool pend_conn, pend_report;
        u8 filter_policy;
        int err;

        /* Pause advertising if resolving list can be used as controllers
         * cannot accept resolving list modifications while advertising.
         */
        if (use_ll_privacy(hdev)) {
                err = hci_pause_advertising_sync(hdev);
                if (err) {
                        bt_dev_err(hdev, "pause advertising failed: %d", err);
                        return 0x00;
                }
        }

        /* Disable address resolution while reprogramming accept list since
         * devices that do have an IRK will be programmed in the resolving list
         * when LL Privacy is enabled.
         */
        err = hci_le_set_addr_resolution_enable_sync(hdev, 0x00);
        if (err) {
                bt_dev_err(hdev, "Unable to disable LL privacy: %d", err);
                goto done;
        }

        /* Go through the current accept list programmed into the
         * controller one by one and check if that address is connected or is
         * still in the list of pending connections or list of devices to
         * report. If not present in either list, then remove it from
         * the controller.
         */
        list_for_each_entry_safe(b, t, &hdev->le_accept_list, list) {
                if (hci_conn_hash_lookup_le(hdev, &b->bdaddr, b->bdaddr_type))
                        continue;

                pend_conn = hci_pend_le_action_lookup(&hdev->pend_le_conns,
                                                      &b->bdaddr,
                                                      b->bdaddr_type);
                pend_report = hci_pend_le_action_lookup(&hdev->pend_le_reports,
                                                        &b->bdaddr,
                                                        b->bdaddr_type);

                /* If the device is not likely to connect or report,
                 * remove it from the acceptlist.
                 */
                if (!pend_conn && !pend_report) {
                        hci_le_del_accept_list_sync(hdev, &b->bdaddr,
                                                    b->bdaddr_type);
                        continue;
                }

                num_entries++;
        }

        /* Since all no longer valid accept list entries have been
         * removed, walk through the list of pending connections
         * and ensure that any new device gets programmed into
         * the controller.
         *
         * If the list of the devices is larger than the list of
         * available accept list entries in the controller, then
         * just abort and return filer policy value to not use the
         * accept list.
         */
        list_for_each_entry(params, &hdev->pend_le_conns, action) {
                err = hci_le_add_accept_list_sync(hdev, params, &num_entries);
                if (err)
                        goto done;
        }

        /* After adding all new pending connections, walk through
         * the list of pending reports and also add these to the
         * accept list if there is still space. Abort if space runs out.
         */
        list_for_each_entry(params, &hdev->pend_le_reports, action) {
                err = hci_le_add_accept_list_sync(hdev, params, &num_entries);
                if (err)
                        goto done;
        }

        /* Use the allowlist unless the following conditions are all true:
         * - We are not currently suspending
         * - There are 1 or more ADV monitors registered and it's not offloaded
         * - Interleaved scanning is not currently using the allowlist
         */
        if (!idr_is_empty(&hdev->adv_monitors_idr) && !hdev->suspended &&
            hci_get_adv_monitor_offload_ext(hdev) == HCI_ADV_MONITOR_EXT_NONE &&
            hdev->interleave_scan_state != INTERLEAVE_SCAN_ALLOWLIST)
                err = -EINVAL;

done:
        filter_policy = err ? 0x00 : 0x01;

        /* Enable address resolution when LL Privacy is enabled. */
        err = hci_le_set_addr_resolution_enable_sync(hdev, 0x01);
        if (err)
                bt_dev_err(hdev, "Unable to enable LL privacy: %d", err);

        /* Resume advertising if it was paused */
        if (use_ll_privacy(hdev))
                hci_resume_advertising_sync(hdev);

        /* Select filter policy to use accept list */
        return filter_policy;
}

/* Returns true if an le connection is in the scanning state */
static inline bool hci_is_le_conn_scanning(struct hci_dev *hdev)
{
        struct hci_conn_hash *h = &hdev->conn_hash;
        struct hci_conn  *c;

        rcu_read_lock();

        list_for_each_entry_rcu(c, &h->list, list) {
                if (c->type == LE_LINK && c->state == BT_CONNECT &&
                    test_bit(HCI_CONN_SCANNING, &c->flags)) {
                        rcu_read_unlock();
                        return true;
                }
        }

        rcu_read_unlock();

        return false;
}

static int hci_le_set_ext_scan_param_sync(struct hci_dev *hdev, u8 type,
                                          u16 interval, u16 window,
                                          u8 own_addr_type, u8 filter_policy)
{
        struct hci_cp_le_set_ext_scan_params *cp;
        struct hci_cp_le_scan_phy_params *phy;
        u8 data[sizeof(*cp) + sizeof(*phy) * 2];
        u8 num_phy = 0;

        cp = (void *)data;
        phy = (void *)cp->data;

        memset(data, 0, sizeof(data));

        cp->own_addr_type = own_addr_type;
        cp->filter_policy = filter_policy;

        if (scan_1m(hdev) || scan_2m(hdev)) {
                cp->scanning_phys |= LE_SCAN_PHY_1M;

                phy->type = type;
                phy->interval = cpu_to_le16(interval);
                phy->window = cpu_to_le16(window);

                num_phy++;
                phy++;
        }

        if (scan_coded(hdev)) {
                cp->scanning_phys |= LE_SCAN_PHY_CODED;

                phy->type = type;
                phy->interval = cpu_to_le16(interval);
                phy->window = cpu_to_le16(window);

                num_phy++;
                phy++;
        }

        return __hci_cmd_sync_status(hdev, HCI_OP_LE_SET_EXT_SCAN_PARAMS,
                                     sizeof(*cp) + sizeof(*phy) * num_phy,
                                     data, HCI_CMD_TIMEOUT);
}

static int hci_le_set_scan_param_sync(struct hci_dev *hdev, u8 type,
                                      u16 interval, u16 window,
                                      u8 own_addr_type, u8 filter_policy)
{
        struct hci_cp_le_set_scan_param cp;

        if (use_ext_scan(hdev))
                return hci_le_set_ext_scan_param_sync(hdev, type, interval,
                                                      window, own_addr_type,
                                                      filter_policy);

        memset(&cp, 0, sizeof(cp));
        cp.type = type;
        cp.interval = cpu_to_le16(interval);
        cp.window = cpu_to_le16(window);
        cp.own_address_type = own_addr_type;
        cp.filter_policy = filter_policy;

        return __hci_cmd_sync_status(hdev, HCI_OP_LE_SET_SCAN_PARAM,
                                     sizeof(cp), &cp, HCI_CMD_TIMEOUT);
}

static int hci_start_scan_sync(struct hci_dev *hdev, u8 type, u16 interval,
                               u16 window, u8 own_addr_type, u8 filter_policy,
                               u8 filter_dup)
{
        int err;

        if (hdev->scanning_paused) {
                bt_dev_dbg(hdev, "Scanning is paused for suspend");
                return 0;
        }

        err = hci_le_set_scan_param_sync(hdev, type, interval, window,
                                         own_addr_type, filter_policy);
        if (err)
                return err;

        return hci_le_set_scan_enable_sync(hdev, LE_SCAN_ENABLE, filter_dup);
}

static int hci_passive_scan_sync(struct hci_dev *hdev)
{
        u8 own_addr_type;
        u8 filter_policy;
        u16 window, interval;
        u8 filter_dups = LE_SCAN_FILTER_DUP_ENABLE;
        int err;

        if (hdev->scanning_paused) {
                bt_dev_dbg(hdev, "Scanning is paused for suspend");
                return 0;
        }

        err = hci_scan_disable_sync(hdev);
        if (err) {
                bt_dev_err(hdev, "disable scanning failed: %d", err);
                return err;
        }

        /* Set require_privacy to false since no SCAN_REQ are send
         * during passive scanning. Not using an non-resolvable address
         * here is important so that peer devices using direct
         * advertising with our address will be correctly reported
         * by the controller.
         */
        if (hci_update_random_address_sync(hdev, false, scan_use_rpa(hdev),
                                           &own_addr_type))
                return 0;

        if (hdev->enable_advmon_interleave_scan &&
            hci_update_interleaved_scan_sync(hdev))
                return 0;

        bt_dev_dbg(hdev, "interleave state %d", hdev->interleave_scan_state);

        /* Adding or removing entries from the accept list must
         * happen before enabling scanning. The controller does
         * not allow accept list modification while scanning.
         */
        filter_policy = hci_update_accept_list_sync(hdev);

        /* When the controller is using random resolvable addresses and
         * with that having LE privacy enabled, then controllers with
         * Extended Scanner Filter Policies support can now enable support
         * for handling directed advertising.
         *
         * So instead of using filter polices 0x00 (no acceptlist)
         * and 0x01 (acceptlist enabled) use the new filter policies
         * 0x02 (no acceptlist) and 0x03 (acceptlist enabled).
         */
        if (hci_dev_test_flag(hdev, HCI_PRIVACY) &&
            (hdev->le_features[0] & HCI_LE_EXT_SCAN_POLICY))
                filter_policy |= 0x02;

        if (hdev->suspended) {
                window = hdev->le_scan_window_suspend;
                interval = hdev->le_scan_int_suspend;
        } else if (hci_is_le_conn_scanning(hdev)) {
                window = hdev->le_scan_window_connect;
                interval = hdev->le_scan_int_connect;
        } else if (hci_is_adv_monitoring(hdev)) {
                window = hdev->le_scan_window_adv_monitor;
                interval = hdev->le_scan_int_adv_monitor;
        } else {
                window = hdev->le_scan_window;
                interval = hdev->le_scan_interval;
        }

        /* Disable all filtering for Mesh */
        if (hci_dev_test_flag(hdev, HCI_MESH)) {
                filter_policy = 0;
                filter_dups = LE_SCAN_FILTER_DUP_DISABLE;
        }

        bt_dev_dbg(hdev, "LE passive scan with acceptlist = %d", filter_policy);

        return hci_start_scan_sync(hdev, LE_SCAN_PASSIVE, interval, window,
                                   own_addr_type, filter_policy, filter_dups);
}

/* This function controls the passive scanning based on hdev->pend_le_conns
 * list. If there are pending LE connection we start the background scanning,
 * otherwise we stop it in the following sequence:
 *
 * If there are devices to scan:
 *
 * Disable Scanning -> Update Accept List ->
 * use_ll_privacy((Disable Advertising) -> Disable Resolving List ->
 * Update Resolving List -> Enable Resolving List -> (Enable Advertising)) ->
 * Enable Scanning
 *
 * Otherwise:
 *
 * Disable Scanning
 */
int hci_update_passive_scan_sync(struct hci_dev *hdev)
{
        int err;

        if (!test_bit(HCI_UP, &hdev->flags) ||
            test_bit(HCI_INIT, &hdev->flags) ||
            hci_dev_test_flag(hdev, HCI_SETUP) ||
            hci_dev_test_flag(hdev, HCI_CONFIG) ||
            hci_dev_test_flag(hdev, HCI_AUTO_OFF) ||
            hci_dev_test_flag(hdev, HCI_UNREGISTER))
                return 0;

        /* No point in doing scanning if LE support hasn't been enabled */
        if (!hci_dev_test_flag(hdev, HCI_LE_ENABLED))
                return 0;

        /* If discovery is active don't interfere with it */
        if (hdev->discovery.state != DISCOVERY_STOPPED)
                return 0;

        /* Reset RSSI and UUID filters when starting background scanning
         * since these filters are meant for service discovery only.
         *
         * The Start Discovery and Start Service Discovery operations
         * ensure to set proper values for RSSI threshold and UUID
         * filter list. So it is safe to just reset them here.
         */
        hci_discovery_filter_clear(hdev);

        bt_dev_dbg(hdev, "ADV monitoring is %s",
                   hci_is_adv_monitoring(hdev) ? "on" : "off");

        if (!hci_dev_test_flag(hdev, HCI_MESH) &&
            list_empty(&hdev->pend_le_conns) &&
            list_empty(&hdev->pend_le_reports) &&
            !hci_is_adv_monitoring(hdev) &&
            !hci_dev_test_flag(hdev, HCI_PA_SYNC)) {
                /* If there is no pending LE connections or devices
                 * to be scanned for or no ADV monitors, we should stop the
                 * background scanning.
                 */

                bt_dev_dbg(hdev, "stopping background scanning");

                err = hci_scan_disable_sync(hdev);
                if (err)
                        bt_dev_err(hdev, "stop background scanning failed: %d",
                                   err);
        } else {
                /* If there is at least one pending LE connection, we should
                 * keep the background scan running.
                 */

                /* If controller is connecting, we should not start scanning
                 * since some controllers are not able to scan and connect at
                 * the same time.
                 */
                if (hci_lookup_le_connect(hdev))
                        return 0;

                bt_dev_dbg(hdev, "start background scanning");

                err = hci_passive_scan_sync(hdev);
                if (err)
                        bt_dev_err(hdev, "start background scanning failed: %d",
                                   err);
        }

        return err;
}

static int update_scan_sync(struct hci_dev *hdev, void *data)
{
        return hci_update_scan_sync(hdev);
}

int hci_update_scan(struct hci_dev *hdev)
{
        return hci_cmd_sync_queue(hdev, update_scan_sync, NULL, NULL);
}

static int update_passive_scan_sync(struct hci_dev *hdev, void *data)
{
        return hci_update_passive_scan_sync(hdev);
}

int hci_update_passive_scan(struct hci_dev *hdev)
{
        /* Only queue if it would have any effect */
        if (!test_bit(HCI_UP, &hdev->flags) ||
            test_bit(HCI_INIT, &hdev->flags) ||
            hci_dev_test_flag(hdev, HCI_SETUP) ||
            hci_dev_test_flag(hdev, HCI_CONFIG) ||
            hci_dev_test_flag(hdev, HCI_AUTO_OFF) ||
            hci_dev_test_flag(hdev, HCI_UNREGISTER))
                return 0;

        return hci_cmd_sync_queue(hdev, update_passive_scan_sync, NULL, NULL);
}

int hci_write_sc_support_sync(struct hci_dev *hdev, u8 val)
{
        int err;

        if (!bredr_sc_enabled(hdev) || lmp_host_sc_capable(hdev))
                return 0;

        err = __hci_cmd_sync_status(hdev, HCI_OP_WRITE_SC_SUPPORT,
                                    sizeof(val), &val, HCI_CMD_TIMEOUT);

        if (!err) {
                if (val) {
                        hdev->features[1][0] |= LMP_HOST_SC;
                        hci_dev_set_flag(hdev, HCI_SC_ENABLED);
                } else {
                        hdev->features[1][0] &= ~LMP_HOST_SC;
                        hci_dev_clear_flag(hdev, HCI_SC_ENABLED);
                }
        }

        return err;
}

int hci_write_ssp_mode_sync(struct hci_dev *hdev, u8 mode)
{
        int err;

        if (!hci_dev_test_flag(hdev, HCI_SSP_ENABLED) ||
            lmp_host_ssp_capable(hdev))
                return 0;

        if (!mode && hci_dev_test_flag(hdev, HCI_USE_DEBUG_KEYS)) {
                __hci_cmd_sync_status(hdev, HCI_OP_WRITE_SSP_DEBUG_MODE,
                                      sizeof(mode), &mode, HCI_CMD_TIMEOUT);
        }

        err = __hci_cmd_sync_status(hdev, HCI_OP_WRITE_SSP_MODE,
                                    sizeof(mode), &mode, HCI_CMD_TIMEOUT);
        if (err)
                return err;

        return hci_write_sc_support_sync(hdev, 0x01);
}

int hci_write_le_host_supported_sync(struct hci_dev *hdev, u8 le, u8 simul)
{
        struct hci_cp_write_le_host_supported cp;

        if (!hci_dev_test_flag(hdev, HCI_LE_ENABLED) ||
            !lmp_bredr_capable(hdev))
                return 0;

        /* Check first if we already have the right host state
         * (host features set)
         */
        if (le == lmp_host_le_capable(hdev) &&
            simul == lmp_host_le_br_capable(hdev))
                return 0;

        memset(&cp, 0, sizeof(cp));

        cp.le = le;
        cp.simul = simul;

        return __hci_cmd_sync_status(hdev, HCI_OP_WRITE_LE_HOST_SUPPORTED,
                                     sizeof(cp), &cp, HCI_CMD_TIMEOUT);
}

static int hci_powered_update_adv_sync(struct hci_dev *hdev)
{
        struct adv_info *adv, *tmp;
        int err;

        if (!hci_dev_test_flag(hdev, HCI_LE_ENABLED))
                return 0;

        /* If RPA Resolution has not been enable yet it means the
         * resolving list is empty and we should attempt to program the
         * local IRK in order to support using own_addr_type
         * ADDR_LE_DEV_RANDOM_RESOLVED (0x03).
         */
        if (!hci_dev_test_flag(hdev, HCI_LL_RPA_RESOLUTION)) {
                hci_le_add_resolve_list_sync(hdev, NULL);
                hci_le_set_addr_resolution_enable_sync(hdev, 0x01);
        }

        /* Make sure the controller has a good default for
         * advertising data. This also applies to the case
         * where BR/EDR was toggled during the AUTO_OFF phase.
         */
        if (hci_dev_test_flag(hdev, HCI_ADVERTISING) ||
            list_empty(&hdev->adv_instances)) {
                if (ext_adv_capable(hdev)) {
                        err = hci_setup_ext_adv_instance_sync(hdev, 0x00);
                        if (!err)
                                hci_update_scan_rsp_data_sync(hdev, 0x00);
                } else {
                        err = hci_update_adv_data_sync(hdev, 0x00);
                        if (!err)
                                hci_update_scan_rsp_data_sync(hdev, 0x00);
                }

                if (hci_dev_test_flag(hdev, HCI_ADVERTISING))
                        hci_enable_advertising_sync(hdev);
        }

        /* Call for each tracked instance to be scheduled */
        list_for_each_entry_safe(adv, tmp, &hdev->adv_instances, list)
                hci_schedule_adv_instance_sync(hdev, adv->instance, true);

        return 0;
}

static int hci_write_auth_enable_sync(struct hci_dev *hdev)
{
        u8 link_sec;

        link_sec = hci_dev_test_flag(hdev, HCI_LINK_SECURITY);
        if (link_sec == test_bit(HCI_AUTH, &hdev->flags))
                return 0;

        return __hci_cmd_sync_status(hdev, HCI_OP_WRITE_AUTH_ENABLE,
                                     sizeof(link_sec), &link_sec,
                                     HCI_CMD_TIMEOUT);
}

int hci_write_fast_connectable_sync(struct hci_dev *hdev, bool enable)
{
        struct hci_cp_write_page_scan_activity cp;
        u8 type;
        int err = 0;

        if (!hci_dev_test_flag(hdev, HCI_BREDR_ENABLED))
                return 0;

        if (hdev->hci_ver < BLUETOOTH_VER_1_2)
                return 0;

        memset(&cp, 0, sizeof(cp));

        if (enable) {
                type = PAGE_SCAN_TYPE_INTERLACED;

                /* 160 msec page scan interval */
                cp.interval = cpu_to_le16(0x0100);
        } else {
                type = hdev->def_page_scan_type;
                cp.interval = cpu_to_le16(hdev->def_page_scan_int);
        }

        cp.window = cpu_to_le16(hdev->def_page_scan_window);

        if (__cpu_to_le16(hdev->page_scan_interval) != cp.interval ||
            __cpu_to_le16(hdev->page_scan_window) != cp.window) {
                err = __hci_cmd_sync_status(hdev,
                                            HCI_OP_WRITE_PAGE_SCAN_ACTIVITY,
                                            sizeof(cp), &cp, HCI_CMD_TIMEOUT);
                if (err)
                        return err;
        }

        if (hdev->page_scan_type != type)
                err = __hci_cmd_sync_status(hdev,
                                            HCI_OP_WRITE_PAGE_SCAN_TYPE,
                                            sizeof(type), &type,
                                            HCI_CMD_TIMEOUT);

        return err;
}

static bool disconnected_accept_list_entries(struct hci_dev *hdev)
{
        struct bdaddr_list *b;

        list_for_each_entry(b, &hdev->accept_list, list) {
                struct hci_conn *conn;

                conn = hci_conn_hash_lookup_ba(hdev, ACL_LINK, &b->bdaddr);
                if (!conn)
                        return true;

                if (conn->state != BT_CONNECTED && conn->state != BT_CONFIG)
                        return true;
        }

        return false;
}

static int hci_write_scan_enable_sync(struct hci_dev *hdev, u8 val)
{
        return __hci_cmd_sync_status(hdev, HCI_OP_WRITE_SCAN_ENABLE,
                                            sizeof(val), &val,
                                            HCI_CMD_TIMEOUT);
}

int hci_update_scan_sync(struct hci_dev *hdev)
{
        u8 scan;

        if (!hci_dev_test_flag(hdev, HCI_BREDR_ENABLED))
                return 0;

        if (!hdev_is_powered(hdev))
                return 0;

        if (mgmt_powering_down(hdev))
                return 0;

        if (hdev->scanning_paused)
                return 0;

        if (hci_dev_test_flag(hdev, HCI_CONNECTABLE) ||
            disconnected_accept_list_entries(hdev))
                scan = SCAN_PAGE;
        else
                scan = SCAN_DISABLED;

        if (hci_dev_test_flag(hdev, HCI_DISCOVERABLE))
                scan |= SCAN_INQUIRY;

        if (test_bit(HCI_PSCAN, &hdev->flags) == !!(scan & SCAN_PAGE) &&
            test_bit(HCI_ISCAN, &hdev->flags) == !!(scan & SCAN_INQUIRY))
                return 0;

        return hci_write_scan_enable_sync(hdev, scan);
}

int hci_update_name_sync(struct hci_dev *hdev)
{
        struct hci_cp_write_local_name cp;

        memset(&cp, 0, sizeof(cp));

        memcpy(cp.name, hdev->dev_name, sizeof(cp.name));

        return __hci_cmd_sync_status(hdev, HCI_OP_WRITE_LOCAL_NAME,
                                            sizeof(cp), &cp,
                                            HCI_CMD_TIMEOUT);
}

/* This function perform powered update HCI command sequence after the HCI init
 * sequence which end up resetting all states, the sequence is as follows:
 *
 * HCI_SSP_ENABLED(Enable SSP)
 * HCI_LE_ENABLED(Enable LE)
 * HCI_LE_ENABLED(use_ll_privacy(Add local IRK to Resolving List) ->
 * Update adv data)
 * Enable Authentication
 * lmp_bredr_capable(Set Fast Connectable -> Set Scan Type -> Set Class ->
 * Set Name -> Set EIR)
 * HCI_FORCE_STATIC_ADDR | BDADDR_ANY && !HCI_BREDR_ENABLED (Set Static Address)
 */
int hci_powered_update_sync(struct hci_dev *hdev)
{
        int err;

        /* Register the available SMP channels (BR/EDR and LE) only when
         * successfully powering on the controller. This late
         * registration is required so that LE SMP can clearly decide if
         * the public address or static address is used.
         */
        smp_register(hdev);

        err = hci_write_ssp_mode_sync(hdev, 0x01);
        if (err)
                return err;

        err = hci_write_le_host_supported_sync(hdev, 0x01, 0x00);
        if (err)
                return err;

        err = hci_powered_update_adv_sync(hdev);
        if (err)
                return err;

        err = hci_write_auth_enable_sync(hdev);
        if (err)
                return err;

        if (lmp_bredr_capable(hdev)) {
                if (hci_dev_test_flag(hdev, HCI_FAST_CONNECTABLE))
                        hci_write_fast_connectable_sync(hdev, true);
                else
                        hci_write_fast_connectable_sync(hdev, false);
                hci_update_scan_sync(hdev);
                hci_update_class_sync(hdev);
                hci_update_name_sync(hdev);
                hci_update_eir_sync(hdev);
        }

        /* If forcing static address is in use or there is no public
         * address use the static address as random address (but skip
         * the HCI command if the current random address is already the
         * static one.
         *
         * In case BR/EDR has been disabled on a dual-mode controller
         * and a static address has been configured, then use that
         * address instead of the public BR/EDR address.
         */
        if (hci_dev_test_flag(hdev, HCI_FORCE_STATIC_ADDR) ||
            (!bacmp(&hdev->bdaddr, BDADDR_ANY) &&
            !hci_dev_test_flag(hdev, HCI_BREDR_ENABLED))) {
                if (bacmp(&hdev->static_addr, BDADDR_ANY))
                        return hci_set_random_addr_sync(hdev,
                                                        &hdev->static_addr);
        }

        return 0;
}

/**
 * hci_dev_get_bd_addr_from_property - Get the Bluetooth Device Address
 *                                     (BD_ADDR) for a HCI device from
 *                                     a firmware node property.
 * @hdev:       The HCI device
 *
 * Search the firmware node for 'local-bd-address'.
 *
 * All-zero BD addresses are rejected, because those could be properties
 * that exist in the firmware tables, but were not updated by the firmware. For
 * example, the DTS could define 'local-bd-address', with zero BD addresses.
 */
static void hci_dev_get_bd_addr_from_property(struct hci_dev *hdev)
{
        struct fwnode_handle *fwnode = dev_fwnode(hdev->dev.parent);
        bdaddr_t ba;
        int ret;

        ret = fwnode_property_read_u8_array(fwnode, "local-bd-address",
                                            (u8 *)&ba, sizeof(ba));
        if (ret < 0 || !bacmp(&ba, BDADDR_ANY))
                return;

        bacpy(&hdev->public_addr, &ba);
}

struct hci_init_stage {
        int (*func)(struct hci_dev *hdev);
};

/* Run init stage NULL terminated function table */
static int hci_init_stage_sync(struct hci_dev *hdev,
                               const struct hci_init_stage *stage)
{
        size_t i;

        for (i = 0; stage[i].func; i++) {
                int err;

                err = stage[i].func(hdev);
                if (err)
                        return err;
        }

        return 0;
}

/* Read Local Version */
static int hci_read_local_version_sync(struct hci_dev *hdev)
{
        return __hci_cmd_sync_status(hdev, HCI_OP_READ_LOCAL_VERSION,
                                     0, NULL, HCI_CMD_TIMEOUT);
}

/* Read BD Address */
static int hci_read_bd_addr_sync(struct hci_dev *hdev)
{
        return __hci_cmd_sync_status(hdev, HCI_OP_READ_BD_ADDR,
                                     0, NULL, HCI_CMD_TIMEOUT);
}

#define HCI_INIT(_func) \
{ \
        .func = _func, \
}

static const struct hci_init_stage hci_init0[] = {
        /* HCI_OP_READ_LOCAL_VERSION */
        HCI_INIT(hci_read_local_version_sync),
        /* HCI_OP_READ_BD_ADDR */
        HCI_INIT(hci_read_bd_addr_sync),
        {}
};

int hci_reset_sync(struct hci_dev *hdev)
{
        int err;

        set_bit(HCI_RESET, &hdev->flags);

        err = __hci_cmd_sync_status(hdev, HCI_OP_RESET, 0, NULL,
                                    HCI_CMD_TIMEOUT);
        if (err)
                return err;

        return 0;
}

static int hci_init0_sync(struct hci_dev *hdev)
{
        int err;

        bt_dev_dbg(hdev, "");

        /* Reset */
        if (!test_bit(HCI_QUIRK_RESET_ON_CLOSE, &hdev->quirks)) {
                err = hci_reset_sync(hdev);
                if (err)
                        return err;
        }

        return hci_init_stage_sync(hdev, hci_init0);
}

static int hci_unconf_init_sync(struct hci_dev *hdev)
{
        int err;

        if (test_bit(HCI_QUIRK_RAW_DEVICE, &hdev->quirks))
                return 0;

        err = hci_init0_sync(hdev);
        if (err < 0)
                return err;

        if (hci_dev_test_flag(hdev, HCI_SETUP))
                hci_debugfs_create_basic(hdev);

        return 0;
}

/* Read Local Supported Features. */
static int hci_read_local_features_sync(struct hci_dev *hdev)
{
         /* Not all AMP controllers support this command */
        if (hdev->dev_type == HCI_AMP && !(hdev->commands[14] & 0x20))
                return 0;

        return __hci_cmd_sync_status(hdev, HCI_OP_READ_LOCAL_FEATURES,
                                     0, NULL, HCI_CMD_TIMEOUT);
}

/* BR Controller init stage 1 command sequence */
static const struct hci_init_stage br_init1[] = {
        /* HCI_OP_READ_LOCAL_FEATURES */
        HCI_INIT(hci_read_local_features_sync),
        /* HCI_OP_READ_LOCAL_VERSION */
        HCI_INIT(hci_read_local_version_sync),
        /* HCI_OP_READ_BD_ADDR */
        HCI_INIT(hci_read_bd_addr_sync),
        {}
};

/* Read Local Commands */
static int hci_read_local_cmds_sync(struct hci_dev *hdev)
{
        /* All Bluetooth 1.2 and later controllers should support the
         * HCI command for reading the local supported commands.
         *
         * Unfortunately some controllers indicate Bluetooth 1.2 support,
         * but do not have support for this command. If that is the case,
         * the driver can quirk the behavior and skip reading the local
         * supported commands.
         */
        if (hdev->hci_ver > BLUETOOTH_VER_1_1 &&
            !test_bit(HCI_QUIRK_BROKEN_LOCAL_COMMANDS, &hdev->quirks))
                return __hci_cmd_sync_status(hdev, HCI_OP_READ_LOCAL_COMMANDS,
                                             0, NULL, HCI_CMD_TIMEOUT);

        return 0;
}

/* Read Local AMP Info */
static int hci_read_local_amp_info_sync(struct hci_dev *hdev)
{
        return __hci_cmd_sync_status(hdev, HCI_OP_READ_LOCAL_AMP_INFO,
                                     0, NULL, HCI_CMD_TIMEOUT);
}

/* Read Data Blk size */
static int hci_read_data_block_size_sync(struct hci_dev *hdev)
{
        return __hci_cmd_sync_status(hdev, HCI_OP_READ_DATA_BLOCK_SIZE,
                                     0, NULL, HCI_CMD_TIMEOUT);
}

/* Read Flow Control Mode */
static int hci_read_flow_control_mode_sync(struct hci_dev *hdev)
{
        return __hci_cmd_sync_status(hdev, HCI_OP_READ_FLOW_CONTROL_MODE,
                                     0, NULL, HCI_CMD_TIMEOUT);
}

/* Read Location Data */
static int hci_read_location_data_sync(struct hci_dev *hdev)
{
        return __hci_cmd_sync_status(hdev, HCI_OP_READ_LOCATION_DATA,
                                     0, NULL, HCI_CMD_TIMEOUT);
}

/* AMP Controller init stage 1 command sequence */
static const struct hci_init_stage amp_init1[] = {
        /* HCI_OP_READ_LOCAL_VERSION */
        HCI_INIT(hci_read_local_version_sync),
        /* HCI_OP_READ_LOCAL_COMMANDS */
        HCI_INIT(hci_read_local_cmds_sync),
        /* HCI_OP_READ_LOCAL_AMP_INFO */
        HCI_INIT(hci_read_local_amp_info_sync),
        /* HCI_OP_READ_DATA_BLOCK_SIZE */
        HCI_INIT(hci_read_data_block_size_sync),
        /* HCI_OP_READ_FLOW_CONTROL_MODE */
        HCI_INIT(hci_read_flow_control_mode_sync),
        /* HCI_OP_READ_LOCATION_DATA */
        HCI_INIT(hci_read_location_data_sync),
        {}
};

static int hci_init1_sync(struct hci_dev *hdev)
{
        int err;

        bt_dev_dbg(hdev, "");

        /* Reset */
        if (!test_bit(HCI_QUIRK_RESET_ON_CLOSE, &hdev->quirks)) {
                err = hci_reset_sync(hdev);
                if (err)
                        return err;
        }

        switch (hdev->dev_type) {
        case HCI_PRIMARY:
                hdev->flow_ctl_mode = HCI_FLOW_CTL_MODE_PACKET_BASED;
                return hci_init_stage_sync(hdev, br_init1);
        case HCI_AMP:
                hdev->flow_ctl_mode = HCI_FLOW_CTL_MODE_BLOCK_BASED;
                return hci_init_stage_sync(hdev, amp_init1);
        default:
                bt_dev_err(hdev, "Unknown device type %d", hdev->dev_type);
                break;
        }

        return 0;
}

/* AMP Controller init stage 2 command sequence */
static const struct hci_init_stage amp_init2[] = {
        /* HCI_OP_READ_LOCAL_FEATURES */
        HCI_INIT(hci_read_local_features_sync),
        {}
};

/* Read Buffer Size (ACL mtu, max pkt, etc.) */
static int hci_read_buffer_size_sync(struct hci_dev *hdev)
{
        return __hci_cmd_sync_status(hdev, HCI_OP_READ_BUFFER_SIZE,
                                     0, NULL, HCI_CMD_TIMEOUT);
}

/* Read Class of Device */
static int hci_read_dev_class_sync(struct hci_dev *hdev)
{
        return __hci_cmd_sync_status(hdev, HCI_OP_READ_CLASS_OF_DEV,
                                     0, NULL, HCI_CMD_TIMEOUT);
}

/* Read Local Name */
static int hci_read_local_name_sync(struct hci_dev *hdev)
{
        return __hci_cmd_sync_status(hdev, HCI_OP_READ_LOCAL_NAME,
                                     0, NULL, HCI_CMD_TIMEOUT);
}

/* Read Voice Setting */
static int hci_read_voice_setting_sync(struct hci_dev *hdev)
{
        return __hci_cmd_sync_status(hdev, HCI_OP_READ_VOICE_SETTING,
                                     0, NULL, HCI_CMD_TIMEOUT);
}

/* Read Number of Supported IAC */
static int hci_read_num_supported_iac_sync(struct hci_dev *hdev)
{
        return __hci_cmd_sync_status(hdev, HCI_OP_READ_NUM_SUPPORTED_IAC,
                                     0, NULL, HCI_CMD_TIMEOUT);
}

/* Read Current IAC LAP */
static int hci_read_current_iac_lap_sync(struct hci_dev *hdev)
{
        return __hci_cmd_sync_status(hdev, HCI_OP_READ_CURRENT_IAC_LAP,
                                     0, NULL, HCI_CMD_TIMEOUT);
}

static int hci_set_event_filter_sync(struct hci_dev *hdev, u8 flt_type,
                                     u8 cond_type, bdaddr_t *bdaddr,
                                     u8 auto_accept)
{
        struct hci_cp_set_event_filter cp;

        if (!hci_dev_test_flag(hdev, HCI_BREDR_ENABLED))
                return 0;

        if (test_bit(HCI_QUIRK_BROKEN_FILTER_CLEAR_ALL, &hdev->quirks))
                return 0;

        memset(&cp, 0, sizeof(cp));
        cp.flt_type = flt_type;

        if (flt_type != HCI_FLT_CLEAR_ALL) {
                cp.cond_type = cond_type;
                bacpy(&cp.addr_conn_flt.bdaddr, bdaddr);
                cp.addr_conn_flt.auto_accept = auto_accept;
        }

        return __hci_cmd_sync_status(hdev, HCI_OP_SET_EVENT_FLT,
                                     flt_type == HCI_FLT_CLEAR_ALL ?
                                     sizeof(cp.flt_type) : sizeof(cp), &cp,
                                     HCI_CMD_TIMEOUT);
}

static int hci_clear_event_filter_sync(struct hci_dev *hdev)
{
        if (!hci_dev_test_flag(hdev, HCI_EVENT_FILTER_CONFIGURED))
                return 0;

        /* In theory the state machine should not reach here unless
         * a hci_set_event_filter_sync() call succeeds, but we do
         * the check both for parity and as a future reminder.
         */
        if (test_bit(HCI_QUIRK_BROKEN_FILTER_CLEAR_ALL, &hdev->quirks))
                return 0;

        return hci_set_event_filter_sync(hdev, HCI_FLT_CLEAR_ALL, 0x00,
                                         BDADDR_ANY, 0x00);
}

/* Connection accept timeout ~20 secs */
static int hci_write_ca_timeout_sync(struct hci_dev *hdev)
{
        __le16 param = cpu_to_le16(0x7d00);

        return __hci_cmd_sync_status(hdev, HCI_OP_WRITE_CA_TIMEOUT,
                                     sizeof(param), &param, HCI_CMD_TIMEOUT);
}

/* BR Controller init stage 2 command sequence */
static const struct hci_init_stage br_init2[] = {
        /* HCI_OP_READ_BUFFER_SIZE */
        HCI_INIT(hci_read_buffer_size_sync),
        /* HCI_OP_READ_CLASS_OF_DEV */
        HCI_INIT(hci_read_dev_class_sync),
        /* HCI_OP_READ_LOCAL_NAME */
        HCI_INIT(hci_read_local_name_sync),
        /* HCI_OP_READ_VOICE_SETTING */
        HCI_INIT(hci_read_voice_setting_sync),
        /* HCI_OP_READ_NUM_SUPPORTED_IAC */
        HCI_INIT(hci_read_num_supported_iac_sync),
        /* HCI_OP_READ_CURRENT_IAC_LAP */
        HCI_INIT(hci_read_current_iac_lap_sync),
        /* HCI_OP_SET_EVENT_FLT */
        HCI_INIT(hci_clear_event_filter_sync),
        /* HCI_OP_WRITE_CA_TIMEOUT */
        HCI_INIT(hci_write_ca_timeout_sync),
        {}
};

static int hci_write_ssp_mode_1_sync(struct hci_dev *hdev)
{
        u8 mode = 0x01;

        if (!lmp_ssp_capable(hdev) || !hci_dev_test_flag(hdev, HCI_SSP_ENABLED))
                return 0;

        /* When SSP is available, then the host features page
         * should also be available as well. However some
         * controllers list the max_page as 0 as long as SSP
         * has not been enabled. To achieve proper debugging
         * output, force the minimum max_page to 1 at least.
         */
        hdev->max_page = 0x01;

        return __hci_cmd_sync_status(hdev, HCI_OP_WRITE_SSP_MODE,
                                     sizeof(mode), &mode, HCI_CMD_TIMEOUT);
}

static int hci_write_eir_sync(struct hci_dev *hdev)
{
        struct hci_cp_write_eir cp;

        if (!lmp_ssp_capable(hdev) || hci_dev_test_flag(hdev, HCI_SSP_ENABLED))
                return 0;

        memset(hdev->eir, 0, sizeof(hdev->eir));
        memset(&cp, 0, sizeof(cp));

        return __hci_cmd_sync_status(hdev, HCI_OP_WRITE_EIR, sizeof(cp), &cp,
                                     HCI_CMD_TIMEOUT);
}

static int hci_write_inquiry_mode_sync(struct hci_dev *hdev)
{
        u8 mode;

        if (!lmp_inq_rssi_capable(hdev) &&
            !test_bit(HCI_QUIRK_FIXUP_INQUIRY_MODE, &hdev->quirks))
                return 0;

        /* If Extended Inquiry Result events are supported, then
         * they are clearly preferred over Inquiry Result with RSSI
         * events.
         */
        mode = lmp_ext_inq_capable(hdev) ? 0x02 : 0x01;

        return __hci_cmd_sync_status(hdev, HCI_OP_WRITE_INQUIRY_MODE,
                                     sizeof(mode), &mode, HCI_CMD_TIMEOUT);
}

static int hci_read_inq_rsp_tx_power_sync(struct hci_dev *hdev)
{
        if (!lmp_inq_tx_pwr_capable(hdev))
                return 0;

        return __hci_cmd_sync_status(hdev, HCI_OP_READ_INQ_RSP_TX_POWER,
                                     0, NULL, HCI_CMD_TIMEOUT);
}

static int hci_read_local_ext_features_sync(struct hci_dev *hdev, u8 page)
{
        struct hci_cp_read_local_ext_features cp;

        if (!lmp_ext_feat_capable(hdev))
                return 0;

        memset(&cp, 0, sizeof(cp));
        cp.page = page;

        return __hci_cmd_sync_status(hdev, HCI_OP_READ_LOCAL_EXT_FEATURES,
                                     sizeof(cp), &cp, HCI_CMD_TIMEOUT);
}

static int hci_read_local_ext_features_1_sync(struct hci_dev *hdev)
{
        return hci_read_local_ext_features_sync(hdev, 0x01);
}

/* HCI Controller init stage 2 command sequence */
static const struct hci_init_stage hci_init2[] = {
        /* HCI_OP_READ_LOCAL_COMMANDS */
        HCI_INIT(hci_read_local_cmds_sync),
        /* HCI_OP_WRITE_SSP_MODE */
        HCI_INIT(hci_write_ssp_mode_1_sync),
        /* HCI_OP_WRITE_EIR */
        HCI_INIT(hci_write_eir_sync),
        /* HCI_OP_WRITE_INQUIRY_MODE */
        HCI_INIT(hci_write_inquiry_mode_sync),
        /* HCI_OP_READ_INQ_RSP_TX_POWER */
        HCI_INIT(hci_read_inq_rsp_tx_power_sync),
        /* HCI_OP_READ_LOCAL_EXT_FEATURES */
        HCI_INIT(hci_read_local_ext_features_1_sync),
        /* HCI_OP_WRITE_AUTH_ENABLE */
        HCI_INIT(hci_write_auth_enable_sync),
        {}
};

/* Read LE Buffer Size */
static int hci_le_read_buffer_size_sync(struct hci_dev *hdev)
{
        /* Use Read LE Buffer Size V2 if supported */
        if (iso_capable(hdev) && hdev->commands[41] & 0x20)
                return __hci_cmd_sync_status(hdev,
                                             HCI_OP_LE_READ_BUFFER_SIZE_V2,
                                             0, NULL, HCI_CMD_TIMEOUT);

        return __hci_cmd_sync_status(hdev, HCI_OP_LE_READ_BUFFER_SIZE,
                                     0, NULL, HCI_CMD_TIMEOUT);
}

/* Read LE Local Supported Features */
static int hci_le_read_local_features_sync(struct hci_dev *hdev)
{
        return __hci_cmd_sync_status(hdev, HCI_OP_LE_READ_LOCAL_FEATURES,
                                     0, NULL, HCI_CMD_TIMEOUT);
}

/* Read LE Supported States */
static int hci_le_read_supported_states_sync(struct hci_dev *hdev)
{
        return __hci_cmd_sync_status(hdev, HCI_OP_LE_READ_SUPPORTED_STATES,
                                     0, NULL, HCI_CMD_TIMEOUT);
}

/* LE Controller init stage 2 command sequence */
static const struct hci_init_stage le_init2[] = {
        /* HCI_OP_LE_READ_LOCAL_FEATURES */
        HCI_INIT(hci_le_read_local_features_sync),
        /* HCI_OP_LE_READ_BUFFER_SIZE */
        HCI_INIT(hci_le_read_buffer_size_sync),
        /* HCI_OP_LE_READ_SUPPORTED_STATES */
        HCI_INIT(hci_le_read_supported_states_sync),
        {}
};

static int hci_init2_sync(struct hci_dev *hdev)
{
        int err;

        bt_dev_dbg(hdev, "");

        if (hdev->dev_type == HCI_AMP)
                return hci_init_stage_sync(hdev, amp_init2);

        err = hci_init_stage_sync(hdev, hci_init2);
        if (err)
                return err;

        if (lmp_bredr_capable(hdev)) {
                err = hci_init_stage_sync(hdev, br_init2);
                if (err)
                        return err;
        } else {
                hci_dev_clear_flag(hdev, HCI_BREDR_ENABLED);
        }

        if (lmp_le_capable(hdev)) {
                err = hci_init_stage_sync(hdev, le_init2);
                if (err)
                        return err;
                /* LE-only controllers have LE implicitly enabled */
                if (!lmp_bredr_capable(hdev))
                        hci_dev_set_flag(hdev, HCI_LE_ENABLED);
        }

        return 0;
}

static int hci_set_event_mask_sync(struct hci_dev *hdev)
{
        /* The second byte is 0xff instead of 0x9f (two reserved bits
         * disabled) since a Broadcom 1.2 dongle doesn't respond to the
         * command otherwise.
         */
        u8 events[8] = { 0xff, 0xff, 0xfb, 0xff, 0x00, 0x00, 0x00, 0x00 };

        /* CSR 1.1 dongles does not accept any bitfield so don't try to set
         * any event mask for pre 1.2 devices.
         */
        if (hdev->hci_ver < BLUETOOTH_VER_1_2)
                return 0;

        if (lmp_bredr_capable(hdev)) {
                events[4] |= 0x01; /* Flow Specification Complete */

                /* Don't set Disconnect Complete when suspended as that
                 * would wakeup the host when disconnecting due to
                 * suspend.
                 */
                if (hdev->suspended)
                        events[0] &= 0xef;
        } else {
                /* Use a different default for LE-only devices */
                memset(events, 0, sizeof(events));
                events[1] |= 0x20; /* Command Complete */
                events[1] |= 0x40; /* Command Status */
                events[1] |= 0x80; /* Hardware Error */

                /* If the controller supports the Disconnect command, enable
                 * the corresponding event. In addition enable packet flow
                 * control related events.
                 */
                if (hdev->commands[0] & 0x20) {
                        /* Don't set Disconnect Complete when suspended as that
                         * would wakeup the host when disconnecting due to
                         * suspend.
                         */
                        if (!hdev->suspended)
                                events[0] |= 0x10; /* Disconnection Complete */
                        events[2] |= 0x04; /* Number of Completed Packets */
                        events[3] |= 0x02; /* Data Buffer Overflow */
                }

                /* If the controller supports the Read Remote Version
                 * Information command, enable the corresponding event.
                 */
                if (hdev->commands[2] & 0x80)
                        events[1] |= 0x08; /* Read Remote Version Information
                                            * Complete
                                            */

                if (hdev->le_features[0] & HCI_LE_ENCRYPTION) {
                        events[0] |= 0x80; /* Encryption Change */
                        events[5] |= 0x80; /* Encryption Key Refresh Complete */
                }
        }

        if (lmp_inq_rssi_capable(hdev) ||
            test_bit(HCI_QUIRK_FIXUP_INQUIRY_MODE, &hdev->quirks))
                events[4] |= 0x02; /* Inquiry Result with RSSI */

        if (lmp_ext_feat_capable(hdev))
                events[4] |= 0x04; /* Read Remote Extended Features Complete */

        if (lmp_esco_capable(hdev)) {
                events[5] |= 0x08; /* Synchronous Connection Complete */
                events[5] |= 0x10; /* Synchronous Connection Changed */
        }

        if (lmp_sniffsubr_capable(hdev))
                events[5] |= 0x20; /* Sniff Subrating */

        if (lmp_pause_enc_capable(hdev))
                events[5] |= 0x80; /* Encryption Key Refresh Complete */

        if (lmp_ext_inq_capable(hdev))
                events[5] |= 0x40; /* Extended Inquiry Result */

        if (lmp_no_flush_capable(hdev))
                events[7] |= 0x01; /* Enhanced Flush Complete */

        if (lmp_lsto_capable(hdev))
                events[6] |= 0x80; /* Link Supervision Timeout Changed */

        if (lmp_ssp_capable(hdev)) {
                events[6] |= 0x01;      /* IO Capability Request */
                events[6] |= 0x02;      /* IO Capability Response */
                events[6] |= 0x04;      /* User Confirmation Request */
                events[6] |= 0x08;      /* User Passkey Request */
                events[6] |= 0x10;      /* Remote OOB Data Request */
                events[6] |= 0x20;      /* Simple Pairing Complete */
                events[7] |= 0x04;      /* User Passkey Notification */
                events[7] |= 0x08;      /* Keypress Notification */
                events[7] |= 0x10;      /* Remote Host Supported
                                         * Features Notification
                                         */
        }

        if (lmp_le_capable(hdev))
                events[7] |= 0x20;      /* LE Meta-Event */

        return __hci_cmd_sync_status(hdev, HCI_OP_SET_EVENT_MASK,
                                     sizeof(events), events, HCI_CMD_TIMEOUT);
}

static int hci_read_stored_link_key_sync(struct hci_dev *hdev)
{
        struct hci_cp_read_stored_link_key cp;

        if (!(hdev->commands[6] & 0x20) ||
            test_bit(HCI_QUIRK_BROKEN_STORED_LINK_KEY, &hdev->quirks))
                return 0;

        memset(&cp, 0, sizeof(cp));
        bacpy(&cp.bdaddr, BDADDR_ANY);
        cp.read_all = 0x01;

        return __hci_cmd_sync_status(hdev, HCI_OP_READ_STORED_LINK_KEY,
                                     sizeof(cp), &cp, HCI_CMD_TIMEOUT);
}

static int hci_setup_link_policy_sync(struct hci_dev *hdev)
{
        struct hci_cp_write_def_link_policy cp;
        u16 link_policy = 0;

        if (!(hdev->commands[5] & 0x10))
                return 0;

        memset(&cp, 0, sizeof(cp));

        if (lmp_rswitch_capable(hdev))
                link_policy |= HCI_LP_RSWITCH;
        if (lmp_hold_capable(hdev))
                link_policy |= HCI_LP_HOLD;
        if (lmp_sniff_capable(hdev))
                link_policy |= HCI_LP_SNIFF;
        if (lmp_park_capable(hdev))
                link_policy |= HCI_LP_PARK;

        cp.policy = cpu_to_le16(link_policy);

        return __hci_cmd_sync_status(hdev, HCI_OP_WRITE_DEF_LINK_POLICY,
                                     sizeof(cp), &cp, HCI_CMD_TIMEOUT);
}

static int hci_read_page_scan_activity_sync(struct hci_dev *hdev)
{
        if (!(hdev->commands[8] & 0x01))
                return 0;

        return __hci_cmd_sync_status(hdev, HCI_OP_READ_PAGE_SCAN_ACTIVITY,
                                     0, NULL, HCI_CMD_TIMEOUT);
}

static int hci_read_def_err_data_reporting_sync(struct hci_dev *hdev)
{
        if (!(hdev->commands[18] & 0x04) ||
            !(hdev->features[0][6] & LMP_ERR_DATA_REPORTING) ||
            test_bit(HCI_QUIRK_BROKEN_ERR_DATA_REPORTING, &hdev->quirks))
                return 0;

        return __hci_cmd_sync_status(hdev, HCI_OP_READ_DEF_ERR_DATA_REPORTING,
                                     0, NULL, HCI_CMD_TIMEOUT);
}

static int hci_read_page_scan_type_sync(struct hci_dev *hdev)
{
        /* Some older Broadcom based Bluetooth 1.2 controllers do not
         * support the Read Page Scan Type command. Check support for
         * this command in the bit mask of supported commands.
         */
        if (!(hdev->commands[13] & 0x01))
                return 0;

        return __hci_cmd_sync_status(hdev, HCI_OP_READ_PAGE_SCAN_TYPE,
                                     0, NULL, HCI_CMD_TIMEOUT);
}

/* Read features beyond page 1 if available */
static int hci_read_local_ext_features_all_sync(struct hci_dev *hdev)
{
        u8 page;
        int err;

        if (!lmp_ext_feat_capable(hdev))
                return 0;

        for (page = 2; page < HCI_MAX_PAGES && page <= hdev->max_page;
             page++) {
                err = hci_read_local_ext_features_sync(hdev, page);
                if (err)
                        return err;
        }

        return 0;
}

/* HCI Controller init stage 3 command sequence */
static const struct hci_init_stage hci_init3[] = {
        /* HCI_OP_SET_EVENT_MASK */
        HCI_INIT(hci_set_event_mask_sync),
        /* HCI_OP_READ_STORED_LINK_KEY */
        HCI_INIT(hci_read_stored_link_key_sync),
        /* HCI_OP_WRITE_DEF_LINK_POLICY */
        HCI_INIT(hci_setup_link_policy_sync),
        /* HCI_OP_READ_PAGE_SCAN_ACTIVITY */
        HCI_INIT(hci_read_page_scan_activity_sync),
        /* HCI_OP_READ_DEF_ERR_DATA_REPORTING */
        HCI_INIT(hci_read_def_err_data_reporting_sync),
        /* HCI_OP_READ_PAGE_SCAN_TYPE */
        HCI_INIT(hci_read_page_scan_type_sync),
        /* HCI_OP_READ_LOCAL_EXT_FEATURES */
        HCI_INIT(hci_read_local_ext_features_all_sync),
        {}
};

static int hci_le_set_event_mask_sync(struct hci_dev *hdev)
{
        u8 events[8];

        if (!lmp_le_capable(hdev))
                return 0;

        memset(events, 0, sizeof(events));

        if (hdev->le_features[0] & HCI_LE_ENCRYPTION)
                events[0] |= 0x10;      /* LE Long Term Key Request */

        /* If controller supports the Connection Parameters Request
         * Link Layer Procedure, enable the corresponding event.
         */
        if (hdev->le_features[0] & HCI_LE_CONN_PARAM_REQ_PROC)
                /* LE Remote Connection Parameter Request */
                events[0] |= 0x20;

        /* If the controller supports the Data Length Extension
         * feature, enable the corresponding event.
         */
        if (hdev->le_features[0] & HCI_LE_DATA_LEN_EXT)
                events[0] |= 0x40;      /* LE Data Length Change */

        /* If the controller supports LL Privacy feature or LE Extended Adv,
         * enable the corresponding event.
         */
        if (use_enhanced_conn_complete(hdev))
                events[1] |= 0x02;      /* LE Enhanced Connection Complete */

        /* If the controller supports Extended Scanner Filter
         * Policies, enable the corresponding event.
         */
        if (hdev->le_features[0] & HCI_LE_EXT_SCAN_POLICY)
                events[1] |= 0x04;      /* LE Direct Advertising Report */

        /* If the controller supports Channel Selection Algorithm #2
         * feature, enable the corresponding event.
         */
        if (hdev->le_features[1] & HCI_LE_CHAN_SEL_ALG2)
                events[2] |= 0x08;      /* LE Channel Selection Algorithm */

        /* If the controller supports the LE Set Scan Enable command,
         * enable the corresponding advertising report event.
         */
        if (hdev->commands[26] & 0x08)
                events[0] |= 0x02;      /* LE Advertising Report */

        /* If the controller supports the LE Create Connection
         * command, enable the corresponding event.
         */
        if (hdev->commands[26] & 0x10)
                events[0] |= 0x01;      /* LE Connection Complete */

        /* If the controller supports the LE Connection Update
         * command, enable the corresponding event.
         */
        if (hdev->commands[27] & 0x04)
                events[0] |= 0x04;      /* LE Connection Update Complete */

        /* If the controller supports the LE Read Remote Used Features
         * command, enable the corresponding event.
         */
        if (hdev->commands[27] & 0x20)
                /* LE Read Remote Used Features Complete */
                events[0] |= 0x08;

        /* If the controller supports the LE Read Local P-256
         * Public Key command, enable the corresponding event.
         */
        if (hdev->commands[34] & 0x02)
                /* LE Read Local P-256 Public Key Complete */
                events[0] |= 0x80;

        /* If the controller supports the LE Generate DHKey
         * command, enable the corresponding event.
         */
        if (hdev->commands[34] & 0x04)
                events[1] |= 0x01;      /* LE Generate DHKey Complete */

        /* If the controller supports the LE Set Default PHY or
         * LE Set PHY commands, enable the corresponding event.
         */
        if (hdev->commands[35] & (0x20 | 0x40))
                events[1] |= 0x08;        /* LE PHY Update Complete */

        /* If the controller supports LE Set Extended Scan Parameters
         * and LE Set Extended Scan Enable commands, enable the
         * corresponding event.
         */
        if (use_ext_scan(hdev))
                events[1] |= 0x10;      /* LE Extended Advertising Report */

        /* If the controller supports the LE Extended Advertising
         * command, enable the corresponding event.
         */
        if (ext_adv_capable(hdev))
                events[2] |= 0x02;      /* LE Advertising Set Terminated */

        if (cis_capable(hdev)) {
                events[3] |= 0x01;      /* LE CIS Established */
                if (cis_peripheral_capable(hdev))
                        events[3] |= 0x02; /* LE CIS Request */
        }

        if (bis_capable(hdev)) {
                events[3] |= 0x04;      /* LE Create BIG Complete */
                events[3] |= 0x08;      /* LE Terminate BIG Complete */
                events[3] |= 0x10;      /* LE BIG Sync Established */
                events[3] |= 0x20;      /* LE BIG Sync Loss */
        }

        return __hci_cmd_sync_status(hdev, HCI_OP_LE_SET_EVENT_MASK,
                                     sizeof(events), events, HCI_CMD_TIMEOUT);
}

/* Read LE Advertising Channel TX Power */
static int hci_le_read_adv_tx_power_sync(struct hci_dev *hdev)
{
        if ((hdev->commands[25] & 0x40) && !ext_adv_capable(hdev)) {
                /* HCI TS spec forbids mixing of legacy and extended
                 * advertising commands wherein READ_ADV_TX_POWER is
                 * also included. So do not call it if extended adv
                 * is supported otherwise controller will return
                 * COMMAND_DISALLOWED for extended commands.
                 */
                return __hci_cmd_sync_status(hdev,
                                               HCI_OP_LE_READ_ADV_TX_POWER,
                                               0, NULL, HCI_CMD_TIMEOUT);
        }

        return 0;
}

/* Read LE Min/Max Tx Power*/
static int hci_le_read_tx_power_sync(struct hci_dev *hdev)
{
        if (!(hdev->commands[38] & 0x80) ||
            test_bit(HCI_QUIRK_BROKEN_READ_TRANSMIT_POWER, &hdev->quirks))
                return 0;

        return __hci_cmd_sync_status(hdev, HCI_OP_LE_READ_TRANSMIT_POWER,
                                     0, NULL, HCI_CMD_TIMEOUT);
}

/* Read LE Accept List Size */
static int hci_le_read_accept_list_size_sync(struct hci_dev *hdev)
{
        if (!(hdev->commands[26] & 0x40))
                return 0;

        return __hci_cmd_sync_status(hdev, HCI_OP_LE_READ_ACCEPT_LIST_SIZE,
                                     0, NULL, HCI_CMD_TIMEOUT);
}

/* Clear LE Accept List */
static int hci_le_clear_accept_list_sync(struct hci_dev *hdev)
{
        if (!(hdev->commands[26] & 0x80))
                return 0;

        return __hci_cmd_sync_status(hdev, HCI_OP_LE_CLEAR_ACCEPT_LIST, 0, NULL,
                                     HCI_CMD_TIMEOUT);
}

/* Read LE Resolving List Size */
static int hci_le_read_resolv_list_size_sync(struct hci_dev *hdev)
{
        if (!(hdev->commands[34] & 0x40))
                return 0;

        return __hci_cmd_sync_status(hdev, HCI_OP_LE_READ_RESOLV_LIST_SIZE,
                                     0, NULL, HCI_CMD_TIMEOUT);
}

/* Clear LE Resolving List */
static int hci_le_clear_resolv_list_sync(struct hci_dev *hdev)
{
        if (!(hdev->commands[34] & 0x20))
                return 0;

        return __hci_cmd_sync_status(hdev, HCI_OP_LE_CLEAR_RESOLV_LIST, 0, NULL,
                                     HCI_CMD_TIMEOUT);
}

/* Set RPA timeout */
static int hci_le_set_rpa_timeout_sync(struct hci_dev *hdev)
{
        __le16 timeout = cpu_to_le16(hdev->rpa_timeout);

        if (!(hdev->commands[35] & 0x04) ||
            test_bit(HCI_QUIRK_BROKEN_SET_RPA_TIMEOUT, &hdev->quirks))
                return 0;

        return __hci_cmd_sync_status(hdev, HCI_OP_LE_SET_RPA_TIMEOUT,
                                     sizeof(timeout), &timeout,
                                     HCI_CMD_TIMEOUT);
}

/* Read LE Maximum Data Length */
static int hci_le_read_max_data_len_sync(struct hci_dev *hdev)
{
        if (!(hdev->le_features[0] & HCI_LE_DATA_LEN_EXT))
                return 0;

        return __hci_cmd_sync_status(hdev, HCI_OP_LE_READ_MAX_DATA_LEN, 0, NULL,
                                     HCI_CMD_TIMEOUT);
}

/* Read LE Suggested Default Data Length */
static int hci_le_read_def_data_len_sync(struct hci_dev *hdev)
{
        if (!(hdev->le_features[0] & HCI_LE_DATA_LEN_EXT))
                return 0;

        return __hci_cmd_sync_status(hdev, HCI_OP_LE_READ_DEF_DATA_LEN, 0, NULL,
                                     HCI_CMD_TIMEOUT);
}

/* Read LE Number of Supported Advertising Sets */
static int hci_le_read_num_support_adv_sets_sync(struct hci_dev *hdev)
{
        if (!ext_adv_capable(hdev))
                return 0;

        return __hci_cmd_sync_status(hdev,
                                     HCI_OP_LE_READ_NUM_SUPPORTED_ADV_SETS,
                                     0, NULL, HCI_CMD_TIMEOUT);
}

/* Write LE Host Supported */
static int hci_set_le_support_sync(struct hci_dev *hdev)
{
        struct hci_cp_write_le_host_supported cp;

        /* LE-only devices do not support explicit enablement */
        if (!lmp_bredr_capable(hdev))
                return 0;

        memset(&cp, 0, sizeof(cp));

        if (hci_dev_test_flag(hdev, HCI_LE_ENABLED)) {
                cp.le = 0x01;
                cp.simul = 0x00;
        }

        if (cp.le == lmp_host_le_capable(hdev))
                return 0;

        return __hci_cmd_sync_status(hdev, HCI_OP_WRITE_LE_HOST_SUPPORTED,
                                     sizeof(cp), &cp, HCI_CMD_TIMEOUT);
}

/* LE Set Host Feature */
static int hci_le_set_host_feature_sync(struct hci_dev *hdev)
{
        struct hci_cp_le_set_host_feature cp;

        if (!iso_capable(hdev))
                return 0;

        memset(&cp, 0, sizeof(cp));

        /* Isochronous Channels (Host Support) */
        cp.bit_number = 32;
        cp.bit_value = 1;

        return __hci_cmd_sync_status(hdev, HCI_OP_LE_SET_HOST_FEATURE,
                                     sizeof(cp), &cp, HCI_CMD_TIMEOUT);
}

/* LE Controller init stage 3 command sequence */
static const struct hci_init_stage le_init3[] = {
        /* HCI_OP_LE_SET_EVENT_MASK */
        HCI_INIT(hci_le_set_event_mask_sync),
        /* HCI_OP_LE_READ_ADV_TX_POWER */
        HCI_INIT(hci_le_read_adv_tx_power_sync),
        /* HCI_OP_LE_READ_TRANSMIT_POWER */
        HCI_INIT(hci_le_read_tx_power_sync),
        /* HCI_OP_LE_READ_ACCEPT_LIST_SIZE */
        HCI_INIT(hci_le_read_accept_list_size_sync),
        /* HCI_OP_LE_CLEAR_ACCEPT_LIST */
        HCI_INIT(hci_le_clear_accept_list_sync),
        /* HCI_OP_LE_READ_RESOLV_LIST_SIZE */
        HCI_INIT(hci_le_read_resolv_list_size_sync),
        /* HCI_OP_LE_CLEAR_RESOLV_LIST */
        HCI_INIT(hci_le_clear_resolv_list_sync),
        /* HCI_OP_LE_SET_RPA_TIMEOUT */
        HCI_INIT(hci_le_set_rpa_timeout_sync),
        /* HCI_OP_LE_READ_MAX_DATA_LEN */
        HCI_INIT(hci_le_read_max_data_len_sync),
        /* HCI_OP_LE_READ_DEF_DATA_LEN */
        HCI_INIT(hci_le_read_def_data_len_sync),
        /* HCI_OP_LE_READ_NUM_SUPPORTED_ADV_SETS */
        HCI_INIT(hci_le_read_num_support_adv_sets_sync),
        /* HCI_OP_WRITE_LE_HOST_SUPPORTED */
        HCI_INIT(hci_set_le_support_sync),
        /* HCI_OP_LE_SET_HOST_FEATURE */
        HCI_INIT(hci_le_set_host_feature_sync),
        {}
};

static int hci_init3_sync(struct hci_dev *hdev)
{
        int err;

        bt_dev_dbg(hdev, "");

        err = hci_init_stage_sync(hdev, hci_init3);
        if (err)
                return err;

        if (lmp_le_capable(hdev))
                return hci_init_stage_sync(hdev, le_init3);

        return 0;
}

static int hci_delete_stored_link_key_sync(struct hci_dev *hdev)
{
        struct hci_cp_delete_stored_link_key cp;

        /* Some Broadcom based Bluetooth controllers do not support the
         * Delete Stored Link Key command. They are clearly indicating its
         * absence in the bit mask of supported commands.
         *
         * Check the supported commands and only if the command is marked
         * as supported send it. If not supported assume that the controller
         * does not have actual support for stored link keys which makes this
         * command redundant anyway.
         *
         * Some controllers indicate that they support handling deleting
         * stored link keys, but they don't. The quirk lets a driver
         * just disable this command.
         */
        if (!(hdev->commands[6] & 0x80) ||
            test_bit(HCI_QUIRK_BROKEN_STORED_LINK_KEY, &hdev->quirks))
                return 0;

        memset(&cp, 0, sizeof(cp));
        bacpy(&cp.bdaddr, BDADDR_ANY);
        cp.delete_all = 0x01;

        return __hci_cmd_sync_status(hdev, HCI_OP_DELETE_STORED_LINK_KEY,
                                     sizeof(cp), &cp, HCI_CMD_TIMEOUT);
}

static int hci_set_event_mask_page_2_sync(struct hci_dev *hdev)
{
        u8 events[8] = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
        bool changed = false;

        /* Set event mask page 2 if the HCI command for it is supported */
        if (!(hdev->commands[22] & 0x04))
                return 0;

        /* If Connectionless Peripheral Broadcast central role is supported
         * enable all necessary events for it.
         */
        if (lmp_cpb_central_capable(hdev)) {
                events[1] |= 0x40;      /* Triggered Clock Capture */
                events[1] |= 0x80;      /* Synchronization Train Complete */
                events[2] |= 0x08;      /* Truncated Page Complete */
                events[2] |= 0x20;      /* CPB Channel Map Change */
                changed = true;
        }

        /* If Connectionless Peripheral Broadcast peripheral role is supported
         * enable all necessary events for it.
         */
        if (lmp_cpb_peripheral_capable(hdev)) {
                events[2] |= 0x01;      /* Synchronization Train Received */
                events[2] |= 0x02;      /* CPB Receive */
                events[2] |= 0x04;      /* CPB Timeout */
                events[2] |= 0x10;      /* Peripheral Page Response Timeout */
                changed = true;
        }

        /* Enable Authenticated Payload Timeout Expired event if supported */
        if (lmp_ping_capable(hdev) || hdev->le_features[0] & HCI_LE_PING) {
                events[2] |= 0x80;
                changed = true;
        }

        /* Some Broadcom based controllers indicate support for Set Event
         * Mask Page 2 command, but then actually do not support it. Since
         * the default value is all bits set to zero, the command is only
         * required if the event mask has to be changed. In case no change
         * to the event mask is needed, skip this command.
         */
        if (!changed)
                return 0;

        return __hci_cmd_sync_status(hdev, HCI_OP_SET_EVENT_MASK_PAGE_2,
                                     sizeof(events), events, HCI_CMD_TIMEOUT);
}

/* Read local codec list if the HCI command is supported */
static int hci_read_local_codecs_sync(struct hci_dev *hdev)
{
        if (hdev->commands[45] & 0x04)
                hci_read_supported_codecs_v2(hdev);
        else if (hdev->commands[29] & 0x20)
                hci_read_supported_codecs(hdev);

        return 0;
}

/* Read local pairing options if the HCI command is supported */
static int hci_read_local_pairing_opts_sync(struct hci_dev *hdev)
{
        if (!(hdev->commands[41] & 0x08))
                return 0;

        return __hci_cmd_sync_status(hdev, HCI_OP_READ_LOCAL_PAIRING_OPTS,
                                     0, NULL, HCI_CMD_TIMEOUT);
}

/* Get MWS transport configuration if the HCI command is supported */
static int hci_get_mws_transport_config_sync(struct hci_dev *hdev)
{
        if (!mws_transport_config_capable(hdev))
                return 0;

        return __hci_cmd_sync_status(hdev, HCI_OP_GET_MWS_TRANSPORT_CONFIG,
                                     0, NULL, HCI_CMD_TIMEOUT);
}

/* Check for Synchronization Train support */
static int hci_read_sync_train_params_sync(struct hci_dev *hdev)
{
        if (!lmp_sync_train_capable(hdev))
                return 0;

        return __hci_cmd_sync_status(hdev, HCI_OP_READ_SYNC_TRAIN_PARAMS,
                                     0, NULL, HCI_CMD_TIMEOUT);
}

/* Enable Secure Connections if supported and configured */
static int hci_write_sc_support_1_sync(struct hci_dev *hdev)
{
        u8 support = 0x01;

        if (!hci_dev_test_flag(hdev, HCI_SSP_ENABLED) ||
            !bredr_sc_enabled(hdev))
                return 0;

        return __hci_cmd_sync_status(hdev, HCI_OP_WRITE_SC_SUPPORT,
                                     sizeof(support), &support,
                                     HCI_CMD_TIMEOUT);
}

/* Set erroneous data reporting if supported to the wideband speech
 * setting value
 */
static int hci_set_err_data_report_sync(struct hci_dev *hdev)
{
        struct hci_cp_write_def_err_data_reporting cp;
        bool enabled = hci_dev_test_flag(hdev, HCI_WIDEBAND_SPEECH_ENABLED);

        if (!(hdev->commands[18] & 0x08) ||
            !(hdev->features[0][6] & LMP_ERR_DATA_REPORTING) ||
            test_bit(HCI_QUIRK_BROKEN_ERR_DATA_REPORTING, &hdev->quirks))
                return 0;

        if (enabled == hdev->err_data_reporting)
                return 0;

        memset(&cp, 0, sizeof(cp));
        cp.err_data_reporting = enabled ? ERR_DATA_REPORTING_ENABLED :
                                ERR_DATA_REPORTING_DISABLED;

        return __hci_cmd_sync_status(hdev, HCI_OP_WRITE_DEF_ERR_DATA_REPORTING,
                                    sizeof(cp), &cp, HCI_CMD_TIMEOUT);
}

static const struct hci_init_stage hci_init4[] = {
         /* HCI_OP_DELETE_STORED_LINK_KEY */
        HCI_INIT(hci_delete_stored_link_key_sync),
        /* HCI_OP_SET_EVENT_MASK_PAGE_2 */
        HCI_INIT(hci_set_event_mask_page_2_sync),
        /* HCI_OP_READ_LOCAL_CODECS */
        HCI_INIT(hci_read_local_codecs_sync),
         /* HCI_OP_READ_LOCAL_PAIRING_OPTS */
        HCI_INIT(hci_read_local_pairing_opts_sync),
         /* HCI_OP_GET_MWS_TRANSPORT_CONFIG */
        HCI_INIT(hci_get_mws_transport_config_sync),
         /* HCI_OP_READ_SYNC_TRAIN_PARAMS */
        HCI_INIT(hci_read_sync_train_params_sync),
        /* HCI_OP_WRITE_SC_SUPPORT */
        HCI_INIT(hci_write_sc_support_1_sync),
        /* HCI_OP_WRITE_DEF_ERR_DATA_REPORTING */
        HCI_INIT(hci_set_err_data_report_sync),
        {}
};

/* Set Suggested Default Data Length to maximum if supported */
static int hci_le_set_write_def_data_len_sync(struct hci_dev *hdev)
{
        struct hci_cp_le_write_def_data_len cp;

        if (!(hdev->le_features[0] & HCI_LE_DATA_LEN_EXT))
                return 0;

        memset(&cp, 0, sizeof(cp));
        cp.tx_len = cpu_to_le16(hdev->le_max_tx_len);
        cp.tx_time = cpu_to_le16(hdev->le_max_tx_time);

        return __hci_cmd_sync_status(hdev, HCI_OP_LE_WRITE_DEF_DATA_LEN,
                                     sizeof(cp), &cp, HCI_CMD_TIMEOUT);
}

/* Set Default PHY parameters if command is supported, enables all supported
 * PHYs according to the LE Features bits.
 */
static int hci_le_set_default_phy_sync(struct hci_dev *hdev)
{
        struct hci_cp_le_set_default_phy cp;

        if (!(hdev->commands[35] & 0x20)) {
                /* If the command is not supported it means only 1M PHY is
                 * supported.
                 */
                hdev->le_tx_def_phys = HCI_LE_SET_PHY_1M;
                hdev->le_rx_def_phys = HCI_LE_SET_PHY_1M;
                return 0;
        }

        memset(&cp, 0, sizeof(cp));
        cp.all_phys = 0x00;
        cp.tx_phys = HCI_LE_SET_PHY_1M;
        cp.rx_phys = HCI_LE_SET_PHY_1M;

        /* Enables 2M PHY if supported */
        if (le_2m_capable(hdev)) {
                cp.tx_phys |= HCI_LE_SET_PHY_2M;
                cp.rx_phys |= HCI_LE_SET_PHY_2M;
        }

        /* Enables Coded PHY if supported */
        if (le_coded_capable(hdev)) {
                cp.tx_phys |= HCI_LE_SET_PHY_CODED;
                cp.rx_phys |= HCI_LE_SET_PHY_CODED;
        }

        return __hci_cmd_sync_status(hdev, HCI_OP_LE_SET_DEFAULT_PHY,
                                     sizeof(cp), &cp, HCI_CMD_TIMEOUT);
}

static const struct hci_init_stage le_init4[] = {
        /* HCI_OP_LE_WRITE_DEF_DATA_LEN */
        HCI_INIT(hci_le_set_write_def_data_len_sync),
        /* HCI_OP_LE_SET_DEFAULT_PHY */
        HCI_INIT(hci_le_set_default_phy_sync),
        {}
};

static int hci_init4_sync(struct hci_dev *hdev)
{
        int err;

        bt_dev_dbg(hdev, "");

        err = hci_init_stage_sync(hdev, hci_init4);
        if (err)
                return err;

        if (lmp_le_capable(hdev))
                return hci_init_stage_sync(hdev, le_init4);

        return 0;
}

static int hci_init_sync(struct hci_dev *hdev)
{
        int err;

        err = hci_init1_sync(hdev);
        if (err < 0)
                return err;

        if (hci_dev_test_flag(hdev, HCI_SETUP))
                hci_debugfs_create_basic(hdev);

        err = hci_init2_sync(hdev);
        if (err < 0)
                return err;

        /* HCI_PRIMARY covers both single-mode LE, BR/EDR and dual-mode
         * BR/EDR/LE type controllers. AMP controllers only need the
         * first two stages of init.
         */
        if (hdev->dev_type != HCI_PRIMARY)
                return 0;

        err = hci_init3_sync(hdev);
        if (err < 0)
                return err;

        err = hci_init4_sync(hdev);
        if (err < 0)
                return err;

        /* This function is only called when the controller is actually in
         * configured state. When the controller is marked as unconfigured,
         * this initialization procedure is not run.
         *
         * It means that it is possible that a controller runs through its
         * setup phase and then discovers missing settings. If that is the
         * case, then this function will not be called. It then will only
         * be called during the config phase.
         *
         * So only when in setup phase or config phase, create the debugfs
         * entries and register the SMP channels.
         */
        if (!hci_dev_test_flag(hdev, HCI_SETUP) &&
            !hci_dev_test_flag(hdev, HCI_CONFIG))
                return 0;

        hci_debugfs_create_common(hdev);

        if (lmp_bredr_capable(hdev))
                hci_debugfs_create_bredr(hdev);

        if (lmp_le_capable(hdev))
                hci_debugfs_create_le(hdev);

        return 0;
}

#define HCI_QUIRK_BROKEN(_quirk, _desc) { HCI_QUIRK_BROKEN_##_quirk, _desc }

static const struct {
        unsigned long quirk;
        const char *desc;
} hci_broken_table[] = {
        HCI_QUIRK_BROKEN(LOCAL_COMMANDS,
                         "HCI Read Local Supported Commands not supported"),
        HCI_QUIRK_BROKEN(STORED_LINK_KEY,
                         "HCI Delete Stored Link Key command is advertised, "
                         "but not supported."),
        HCI_QUIRK_BROKEN(ERR_DATA_REPORTING,
                         "HCI Read Default Erroneous Data Reporting command is "
                         "advertised, but not supported."),
        HCI_QUIRK_BROKEN(READ_TRANSMIT_POWER,
                         "HCI Read Transmit Power Level command is advertised, "
                         "but not supported."),
        HCI_QUIRK_BROKEN(FILTER_CLEAR_ALL,
                         "HCI Set Event Filter command not supported."),
        HCI_QUIRK_BROKEN(ENHANCED_SETUP_SYNC_CONN,
                         "HCI Enhanced Setup Synchronous Connection command is "
                         "advertised, but not supported."),
        HCI_QUIRK_BROKEN(SET_RPA_TIMEOUT,
                         "HCI LE Set Random Private Address Timeout command is "
                         "advertised, but not supported.")
};

/* This function handles hdev setup stage:
 *
 * Calls hdev->setup
 * Setup address if HCI_QUIRK_USE_BDADDR_PROPERTY is set.
 */
static int hci_dev_setup_sync(struct hci_dev *hdev)
{
        int ret = 0;
        bool invalid_bdaddr;
        size_t i;

        if (!hci_dev_test_flag(hdev, HCI_SETUP) &&
            !test_bit(HCI_QUIRK_NON_PERSISTENT_SETUP, &hdev->quirks))
                return 0;

        bt_dev_dbg(hdev, "");

        hci_sock_dev_event(hdev, HCI_DEV_SETUP);

        if (hdev->setup)
                ret = hdev->setup(hdev);

        for (i = 0; i < ARRAY_SIZE(hci_broken_table); i++) {
                if (test_bit(hci_broken_table[i].quirk, &hdev->quirks))
                        bt_dev_warn(hdev, "%s", hci_broken_table[i].desc);
        }

        /* The transport driver can set the quirk to mark the
         * BD_ADDR invalid before creating the HCI device or in
         * its setup callback.
         */
        invalid_bdaddr = test_bit(HCI_QUIRK_INVALID_BDADDR, &hdev->quirks);

        if (!ret) {
                if (test_bit(HCI_QUIRK_USE_BDADDR_PROPERTY, &hdev->quirks)) {
                        if (!bacmp(&hdev->public_addr, BDADDR_ANY))
                                hci_dev_get_bd_addr_from_property(hdev);

                        if (bacmp(&hdev->public_addr, BDADDR_ANY) &&
                            hdev->set_bdaddr) {
                                ret = hdev->set_bdaddr(hdev,
                                                       &hdev->public_addr);

                                /* If setting of the BD_ADDR from the device
                                 * property succeeds, then treat the address
                                 * as valid even if the invalid BD_ADDR
                                 * quirk indicates otherwise.
                                 */
                                if (!ret)
                                        invalid_bdaddr = false;
                        }
                }
        }

        /* The transport driver can set these quirks before
         * creating the HCI device or in its setup callback.
         *
         * For the invalid BD_ADDR quirk it is possible that
         * it becomes a valid address if the bootloader does
         * provide it (see above).
         *
         * In case any of them is set, the controller has to
         * start up as unconfigured.
         */
        if (test_bit(HCI_QUIRK_EXTERNAL_CONFIG, &hdev->quirks) ||
            invalid_bdaddr)
                hci_dev_set_flag(hdev, HCI_UNCONFIGURED);

        /* For an unconfigured controller it is required to
         * read at least the version information provided by
         * the Read Local Version Information command.
         *
         * If the set_bdaddr driver callback is provided, then
         * also the original Bluetooth public device address
         * will be read using the Read BD Address command.
         */
        if (hci_dev_test_flag(hdev, HCI_UNCONFIGURED))
                return hci_unconf_init_sync(hdev);

        return ret;
}

/* This function handles hdev init stage:
 *
 * Calls hci_dev_setup_sync to perform setup stage
 * Calls hci_init_sync to perform HCI command init sequence
 */
static int hci_dev_init_sync(struct hci_dev *hdev)
{
        int ret;

        bt_dev_dbg(hdev, "");

        atomic_set(&hdev->cmd_cnt, 1);
        set_bit(HCI_INIT, &hdev->flags);

        ret = hci_dev_setup_sync(hdev);

        if (hci_dev_test_flag(hdev, HCI_CONFIG)) {
                /* If public address change is configured, ensure that
                 * the address gets programmed. If the driver does not
                 * support changing the public address, fail the power
                 * on procedure.
                 */
                if (bacmp(&hdev->public_addr, BDADDR_ANY) &&
                    hdev->set_bdaddr)
                        ret = hdev->set_bdaddr(hdev, &hdev->public_addr);
                else
                        ret = -EADDRNOTAVAIL;
        }

        if (!ret) {
                if (!hci_dev_test_flag(hdev, HCI_UNCONFIGURED) &&
                    !hci_dev_test_flag(hdev, HCI_USER_CHANNEL)) {
                        ret = hci_init_sync(hdev);
                        if (!ret && hdev->post_init)
                                ret = hdev->post_init(hdev);
                }
        }

        /* If the HCI Reset command is clearing all diagnostic settings,
         * then they need to be reprogrammed after the init procedure
         * completed.
         */
        if (test_bit(HCI_QUIRK_NON_PERSISTENT_DIAG, &hdev->quirks) &&
            !hci_dev_test_flag(hdev, HCI_USER_CHANNEL) &&
            hci_dev_test_flag(hdev, HCI_VENDOR_DIAG) && hdev->set_diag)
                ret = hdev->set_diag(hdev, true);

        if (!hci_dev_test_flag(hdev, HCI_USER_CHANNEL)) {
                msft_do_open(hdev);
                aosp_do_open(hdev);
        }

        clear_bit(HCI_INIT, &hdev->flags);

        return ret;
}

int hci_dev_open_sync(struct hci_dev *hdev)
{
        int ret;

        bt_dev_dbg(hdev, "");

        if (hci_dev_test_flag(hdev, HCI_UNREGISTER)) {
                ret = -ENODEV;
                goto done;
        }

        if (!hci_dev_test_flag(hdev, HCI_SETUP) &&
            !hci_dev_test_flag(hdev, HCI_CONFIG)) {
                /* Check for rfkill but allow the HCI setup stage to
                 * proceed (which in itself doesn't cause any RF activity).
                 */
                if (hci_dev_test_flag(hdev, HCI_RFKILLED)) {
                        ret = -ERFKILL;
                        goto done;
                }

                /* Check for valid public address or a configured static
                 * random address, but let the HCI setup proceed to
                 * be able to determine if there is a public address
                 * or not.
                 *
                 * In case of user channel usage, it is not important
                 * if a public address or static random address is
                 * available.
                 *
                 * This check is only valid for BR/EDR controllers
                 * since AMP controllers do not have an address.
                 */
                if (!hci_dev_test_flag(hdev, HCI_USER_CHANNEL) &&
                    hdev->dev_type == HCI_PRIMARY &&
                    !bacmp(&hdev->bdaddr, BDADDR_ANY) &&
                    !bacmp(&hdev->static_addr, BDADDR_ANY)) {
                        ret = -EADDRNOTAVAIL;
                        goto done;
                }
        }

        if (test_bit(HCI_UP, &hdev->flags)) {
                ret = -EALREADY;
                goto done;
        }

        if (hdev->open(hdev)) {
                ret = -EIO;
                goto done;
        }

        hci_devcd_reset(hdev);

        set_bit(HCI_RUNNING, &hdev->flags);
        hci_sock_dev_event(hdev, HCI_DEV_OPEN);

        ret = hci_dev_init_sync(hdev);
        if (!ret) {
                hci_dev_hold(hdev);
                hci_dev_set_flag(hdev, HCI_RPA_EXPIRED);
                hci_adv_instances_set_rpa_expired(hdev, true);
                set_bit(HCI_UP, &hdev->flags);
                hci_sock_dev_event(hdev, HCI_DEV_UP);
                hci_leds_update_powered(hdev, true);
                if (!hci_dev_test_flag(hdev, HCI_SETUP) &&
                    !hci_dev_test_flag(hdev, HCI_CONFIG) &&
                    !hci_dev_test_flag(hdev, HCI_UNCONFIGURED) &&
                    !hci_dev_test_flag(hdev, HCI_USER_CHANNEL) &&
                    hci_dev_test_flag(hdev, HCI_MGMT) &&
                    hdev->dev_type == HCI_PRIMARY) {
                        ret = hci_powered_update_sync(hdev);
                        mgmt_power_on(hdev, ret);
                }
        } else {
                /* Init failed, cleanup */
                flush_work(&hdev->tx_work);

                /* Since hci_rx_work() is possible to awake new cmd_work
                 * it should be flushed first to avoid unexpected call of
                 * hci_cmd_work()
                 */
                flush_work(&hdev->rx_work);
                flush_work(&hdev->cmd_work);

                skb_queue_purge(&hdev->cmd_q);
                skb_queue_purge(&hdev->rx_q);

                if (hdev->flush)
                        hdev->flush(hdev);

                if (hdev->sent_cmd) {
                        cancel_delayed_work_sync(&hdev->cmd_timer);
                        kfree_skb(hdev->sent_cmd);
                        hdev->sent_cmd = NULL;
                }

                clear_bit(HCI_RUNNING, &hdev->flags);
                hci_sock_dev_event(hdev, HCI_DEV_CLOSE);

                hdev->close(hdev);
                hdev->flags &= BIT(HCI_RAW);
        }

done:
        return ret;
}

/* This function requires the caller holds hdev->lock */
static void hci_pend_le_actions_clear(struct hci_dev *hdev)
{
        struct hci_conn_params *p;

        list_for_each_entry(p, &hdev->le_conn_params, list) {
                if (p->conn) {
                        hci_conn_drop(p->conn);
                        hci_conn_put(p->conn);
                        p->conn = NULL;
                }
                list_del_init(&p->action);
        }

        BT_DBG("All LE pending actions cleared");
}

static int hci_dev_shutdown(struct hci_dev *hdev)
{
        int err = 0;
        /* Similar to how we first do setup and then set the exclusive access
         * bit for userspace, we must first unset userchannel and then clean up.
         * Otherwise, the kernel can't properly use the hci channel to clean up
         * the controller (some shutdown routines require sending additional
         * commands to the controller for example).
         */
        bool was_userchannel =
                hci_dev_test_and_clear_flag(hdev, HCI_USER_CHANNEL);

        if (!hci_dev_test_flag(hdev, HCI_UNREGISTER) &&
            test_bit(HCI_UP, &hdev->flags)) {
                /* Execute vendor specific shutdown routine */
                if (hdev->shutdown)
                        err = hdev->shutdown(hdev);
        }

        if (was_userchannel)
                hci_dev_set_flag(hdev, HCI_USER_CHANNEL);

        return err;
}

int hci_dev_close_sync(struct hci_dev *hdev)
{
        bool auto_off;
        int err = 0;

        bt_dev_dbg(hdev, "");

        cancel_delayed_work(&hdev->power_off);
        cancel_delayed_work(&hdev->ncmd_timer);
        cancel_delayed_work(&hdev->le_scan_disable);
        cancel_delayed_work(&hdev->le_scan_restart);

        hci_request_cancel_all(hdev);

        if (hdev->adv_instance_timeout) {
                cancel_delayed_work_sync(&hdev->adv_instance_expire);
                hdev->adv_instance_timeout = 0;
        }

        err = hci_dev_shutdown(hdev);

        if (!test_and_clear_bit(HCI_UP, &hdev->flags)) {
                cancel_delayed_work_sync(&hdev->cmd_timer);
                return err;
        }

        hci_leds_update_powered(hdev, false);

        /* Flush RX and TX works */
        flush_work(&hdev->tx_work);
        flush_work(&hdev->rx_work);

        if (hdev->discov_timeout > 0) {
                hdev->discov_timeout = 0;
                hci_dev_clear_flag(hdev, HCI_DISCOVERABLE);
                hci_dev_clear_flag(hdev, HCI_LIMITED_DISCOVERABLE);
        }

        if (hci_dev_test_and_clear_flag(hdev, HCI_SERVICE_CACHE))
                cancel_delayed_work(&hdev->service_cache);

        if (hci_dev_test_flag(hdev, HCI_MGMT)) {
                struct adv_info *adv_instance;

                cancel_delayed_work_sync(&hdev->rpa_expired);

                list_for_each_entry(adv_instance, &hdev->adv_instances, list)
                        cancel_delayed_work_sync(&adv_instance->rpa_expired_cb);
        }

        /* Avoid potential lockdep warnings from the *_flush() calls by
         * ensuring the workqueue is empty up front.
         */
        drain_workqueue(hdev->workqueue);

        hci_dev_lock(hdev);

        hci_discovery_set_state(hdev, DISCOVERY_STOPPED);

        auto_off = hci_dev_test_and_clear_flag(hdev, HCI_AUTO_OFF);

        if (!auto_off && hdev->dev_type == HCI_PRIMARY &&
            !hci_dev_test_flag(hdev, HCI_USER_CHANNEL) &&
            hci_dev_test_flag(hdev, HCI_MGMT))
                __mgmt_power_off(hdev);

        hci_inquiry_cache_flush(hdev);
        hci_pend_le_actions_clear(hdev);
        hci_conn_hash_flush(hdev);
        /* Prevent data races on hdev->smp_data or hdev->smp_bredr_data */
        smp_unregister(hdev);
        hci_dev_unlock(hdev);

        hci_sock_dev_event(hdev, HCI_DEV_DOWN);

        if (!hci_dev_test_flag(hdev, HCI_USER_CHANNEL)) {
                aosp_do_close(hdev);
                msft_do_close(hdev);
        }

        if (hdev->flush)
                hdev->flush(hdev);

        /* Reset device */
        skb_queue_purge(&hdev->cmd_q);
        atomic_set(&hdev->cmd_cnt, 1);
        if (test_bit(HCI_QUIRK_RESET_ON_CLOSE, &hdev->quirks) &&
            !auto_off && !hci_dev_test_flag(hdev, HCI_UNCONFIGURED)) {
                set_bit(HCI_INIT, &hdev->flags);
                hci_reset_sync(hdev);
                clear_bit(HCI_INIT, &hdev->flags);
        }

        /* flush cmd  work */
        flush_work(&hdev->cmd_work);

        /* Drop queues */
        skb_queue_purge(&hdev->rx_q);
        skb_queue_purge(&hdev->cmd_q);
        skb_queue_purge(&hdev->raw_q);

        /* Drop last sent command */
        if (hdev->sent_cmd) {
                cancel_delayed_work_sync(&hdev->cmd_timer);
                kfree_skb(hdev->sent_cmd);
                hdev->sent_cmd = NULL;
        }

        clear_bit(HCI_RUNNING, &hdev->flags);
        hci_sock_dev_event(hdev, HCI_DEV_CLOSE);

        /* After this point our queues are empty and no tasks are scheduled. */
        hdev->close(hdev);

        /* Clear flags */
        hdev->flags &= BIT(HCI_RAW);
        hci_dev_clear_volatile_flags(hdev);

        /* Controller radio is available but is currently powered down */
        hdev->amp_status = AMP_STATUS_POWERED_DOWN;

        memset(hdev->eir, 0, sizeof(hdev->eir));
        memset(hdev->dev_class, 0, sizeof(hdev->dev_class));
        bacpy(&hdev->random_addr, BDADDR_ANY);

        hci_dev_put(hdev);
        return err;
}

/* This function perform power on HCI command sequence as follows:
 *
 * If controller is already up (HCI_UP) performs hci_powered_update_sync
 * sequence otherwise run hci_dev_open_sync which will follow with
 * hci_powered_update_sync after the init sequence is completed.
 */
static int hci_power_on_sync(struct hci_dev *hdev)
{
        int err;

        if (test_bit(HCI_UP, &hdev->flags) &&
            hci_dev_test_flag(hdev, HCI_MGMT) &&
            hci_dev_test_and_clear_flag(hdev, HCI_AUTO_OFF)) {
                cancel_delayed_work(&hdev->power_off);
                return hci_powered_update_sync(hdev);
        }

        err = hci_dev_open_sync(hdev);
        if (err < 0)
                return err;

        /* During the HCI setup phase, a few error conditions are
         * ignored and they need to be checked now. If they are still
         * valid, it is important to return the device back off.
         */
        if (hci_dev_test_flag(hdev, HCI_RFKILLED) ||
            hci_dev_test_flag(hdev, HCI_UNCONFIGURED) ||
            (hdev->dev_type == HCI_PRIMARY &&
             !bacmp(&hdev->bdaddr, BDADDR_ANY) &&
             !bacmp(&hdev->static_addr, BDADDR_ANY))) {
                hci_dev_clear_flag(hdev, HCI_AUTO_OFF);
                hci_dev_close_sync(hdev);
        } else if (hci_dev_test_flag(hdev, HCI_AUTO_OFF)) {
                queue_delayed_work(hdev->req_workqueue, &hdev->power_off,
                                   HCI_AUTO_OFF_TIMEOUT);
        }

        if (hci_dev_test_and_clear_flag(hdev, HCI_SETUP)) {
                /* For unconfigured devices, set the HCI_RAW flag
                 * so that userspace can easily identify them.
                 */
                if (hci_dev_test_flag(hdev, HCI_UNCONFIGURED))
                        set_bit(HCI_RAW, &hdev->flags);

                /* For fully configured devices, this will send
                 * the Index Added event. For unconfigured devices,
                 * it will send Unconfigued Index Added event.
                 *
                 * Devices with HCI_QUIRK_RAW_DEVICE are ignored
                 * and no event will be send.
                 */
                mgmt_index_added(hdev);
        } else if (hci_dev_test_and_clear_flag(hdev, HCI_CONFIG)) {
                /* When the controller is now configured, then it
                 * is important to clear the HCI_RAW flag.
                 */
                if (!hci_dev_test_flag(hdev, HCI_UNCONFIGURED))
                        clear_bit(HCI_RAW, &hdev->flags);

                /* Powering on the controller with HCI_CONFIG set only
                 * happens with the transition from unconfigured to
                 * configured. This will send the Index Added event.
                 */
                mgmt_index_added(hdev);
        }

        return 0;
}

static int hci_remote_name_cancel_sync(struct hci_dev *hdev, bdaddr_t *addr)
{
        struct hci_cp_remote_name_req_cancel cp;

        memset(&cp, 0, sizeof(cp));
        bacpy(&cp.bdaddr, addr);

        return __hci_cmd_sync_status(hdev, HCI_OP_REMOTE_NAME_REQ_CANCEL,
                                     sizeof(cp), &cp, HCI_CMD_TIMEOUT);
}

int hci_stop_discovery_sync(struct hci_dev *hdev)
{
        struct discovery_state *d = &hdev->discovery;
        struct inquiry_entry *e;
        int err;

        bt_dev_dbg(hdev, "state %u", hdev->discovery.state);

        if (d->state == DISCOVERY_FINDING || d->state == DISCOVERY_STOPPING) {
                if (test_bit(HCI_INQUIRY, &hdev->flags)) {
                        err = __hci_cmd_sync_status(hdev, HCI_OP_INQUIRY_CANCEL,
                                                    0, NULL, HCI_CMD_TIMEOUT);
                        if (err)
                                return err;
                }

                if (hci_dev_test_flag(hdev, HCI_LE_SCAN)) {
                        cancel_delayed_work(&hdev->le_scan_disable);
                        cancel_delayed_work(&hdev->le_scan_restart);

                        err = hci_scan_disable_sync(hdev);
                        if (err)
                                return err;
                }

        } else {
                err = hci_scan_disable_sync(hdev);
                if (err)
                        return err;
        }

        /* Resume advertising if it was paused */
        if (use_ll_privacy(hdev))
                hci_resume_advertising_sync(hdev);

        /* No further actions needed for LE-only discovery */
        if (d->type == DISCOV_TYPE_LE)
                return 0;

        if (d->state == DISCOVERY_RESOLVING || d->state == DISCOVERY_STOPPING) {
                e = hci_inquiry_cache_lookup_resolve(hdev, BDADDR_ANY,
                                                     NAME_PENDING);
                if (!e)
                        return 0;

                return hci_remote_name_cancel_sync(hdev, &e->data.bdaddr);
        }

        return 0;
}

static int hci_disconnect_phy_link_sync(struct hci_dev *hdev, u16 handle,
                                        u8 reason)
{
        struct hci_cp_disconn_phy_link cp;

        memset(&cp, 0, sizeof(cp));
        cp.phy_handle = HCI_PHY_HANDLE(handle);
        cp.reason = reason;

        return __hci_cmd_sync_status(hdev, HCI_OP_DISCONN_PHY_LINK,
                                     sizeof(cp), &cp, HCI_CMD_TIMEOUT);
}

static int hci_disconnect_sync(struct hci_dev *hdev, struct hci_conn *conn,
                               u8 reason)
{
        struct hci_cp_disconnect cp;

        if (conn->type == AMP_LINK)
                return hci_disconnect_phy_link_sync(hdev, conn->handle, reason);

        memset(&cp, 0, sizeof(cp));
        cp.handle = cpu_to_le16(conn->handle);
        cp.reason = reason;

        /* Wait for HCI_EV_DISCONN_COMPLETE, not HCI_EV_CMD_STATUS, when the
         * reason is anything but HCI_ERROR_REMOTE_POWER_OFF. This reason is
         * used when suspending or powering off, where we don't want to wait
         * for the peer's response.
         */
        if (reason != HCI_ERROR_REMOTE_POWER_OFF)
                return __hci_cmd_sync_status_sk(hdev, HCI_OP_DISCONNECT,
                                                sizeof(cp), &cp,
                                                HCI_EV_DISCONN_COMPLETE,
                                                HCI_CMD_TIMEOUT, NULL);

        return __hci_cmd_sync_status(hdev, HCI_OP_DISCONNECT, sizeof(cp), &cp,
                                     HCI_CMD_TIMEOUT);
}

static int hci_le_connect_cancel_sync(struct hci_dev *hdev,
                                      struct hci_conn *conn)
{
        if (test_bit(HCI_CONN_SCANNING, &conn->flags))
                return 0;

        if (test_and_set_bit(HCI_CONN_CANCEL, &conn->flags))
                return 0;

        return __hci_cmd_sync_status(hdev, HCI_OP_LE_CREATE_CONN_CANCEL,
                                     0, NULL, HCI_CMD_TIMEOUT);
}

static int hci_connect_cancel_sync(struct hci_dev *hdev, struct hci_conn *conn)
{
        if (conn->type == LE_LINK)
                return hci_le_connect_cancel_sync(hdev, conn);

        if (hdev->hci_ver < BLUETOOTH_VER_1_2)
                return 0;

        return __hci_cmd_sync_status(hdev, HCI_OP_CREATE_CONN_CANCEL,
                                     6, &conn->dst, HCI_CMD_TIMEOUT);
}

static int hci_reject_sco_sync(struct hci_dev *hdev, struct hci_conn *conn,
                               u8 reason)
{
        struct hci_cp_reject_sync_conn_req cp;

        memset(&cp, 0, sizeof(cp));
        bacpy(&cp.bdaddr, &conn->dst);
        cp.reason = reason;

        /* SCO rejection has its own limited set of
         * allowed error values (0x0D-0x0F).
         */
        if (reason < 0x0d || reason > 0x0f)
                cp.reason = HCI_ERROR_REJ_LIMITED_RESOURCES;

        return __hci_cmd_sync_status(hdev, HCI_OP_REJECT_SYNC_CONN_REQ,
                                     sizeof(cp), &cp, HCI_CMD_TIMEOUT);
}

static int hci_reject_conn_sync(struct hci_dev *hdev, struct hci_conn *conn,
                                u8 reason)
{
        struct hci_cp_reject_conn_req cp;

        if (conn->type == SCO_LINK || conn->type == ESCO_LINK)
                return hci_reject_sco_sync(hdev, conn, reason);

        memset(&cp, 0, sizeof(cp));
        bacpy(&cp.bdaddr, &conn->dst);
        cp.reason = reason;

        return __hci_cmd_sync_status(hdev, HCI_OP_REJECT_CONN_REQ,
                                     sizeof(cp), &cp, HCI_CMD_TIMEOUT);
}

int hci_abort_conn_sync(struct hci_dev *hdev, struct hci_conn *conn, u8 reason)
{
        int err;

        switch (conn->state) {
        case BT_CONNECTED:
        case BT_CONFIG:
                return hci_disconnect_sync(hdev, conn, reason);
        case BT_CONNECT:
                err = hci_connect_cancel_sync(hdev, conn);
                /* Cleanup hci_conn object if it cannot be cancelled as it
                 * likelly means the controller and host stack are out of sync.
                 */
                if (err) {
                        hci_dev_lock(hdev);
                        hci_conn_failed(conn, err);
                        hci_dev_unlock(hdev);
                }
                return err;
        case BT_CONNECT2:
                return hci_reject_conn_sync(hdev, conn, reason);
        default:
                conn->state = BT_CLOSED;
                break;
        }

        return 0;
}

static int hci_disconnect_all_sync(struct hci_dev *hdev, u8 reason)
{
        struct hci_conn *conn, *tmp;
        int err;

        list_for_each_entry_safe(conn, tmp, &hdev->conn_hash.list, list) {
                err = hci_abort_conn_sync(hdev, conn, reason);
                if (err)
                        return err;
        }

        return 0;
}

/* This function perform power off HCI command sequence as follows:
 *
 * Clear Advertising
 * Stop Discovery
 * Disconnect all connections
 * hci_dev_close_sync
 */
static int hci_power_off_sync(struct hci_dev *hdev)
{
        int err;

        /* If controller is already down there is nothing to do */
        if (!test_bit(HCI_UP, &hdev->flags))
                return 0;

        if (test_bit(HCI_ISCAN, &hdev->flags) ||
            test_bit(HCI_PSCAN, &hdev->flags)) {
                err = hci_write_scan_enable_sync(hdev, 0x00);
                if (err)
                        return err;
        }

        err = hci_clear_adv_sync(hdev, NULL, false);
        if (err)
                return err;

        err = hci_stop_discovery_sync(hdev);
        if (err)
                return err;

        /* Terminated due to Power Off */
        err = hci_disconnect_all_sync(hdev, HCI_ERROR_REMOTE_POWER_OFF);
        if (err)
                return err;

        return hci_dev_close_sync(hdev);
}

int hci_set_powered_sync(struct hci_dev *hdev, u8 val)
{
        if (val)
                return hci_power_on_sync(hdev);

        return hci_power_off_sync(hdev);
}

static int hci_write_iac_sync(struct hci_dev *hdev)
{
        struct hci_cp_write_current_iac_lap cp;

        if (!hci_dev_test_flag(hdev, HCI_DISCOVERABLE))
                return 0;

        memset(&cp, 0, sizeof(cp));

        if (hci_dev_test_flag(hdev, HCI_LIMITED_DISCOVERABLE)) {
                /* Limited discoverable mode */
                cp.num_iac = min_t(u8, hdev->num_iac, 2);
                cp.iac_lap[0] = 0x00;   /* LIAC */
                cp.iac_lap[1] = 0x8b;
                cp.iac_lap[2] = 0x9e;
                cp.iac_lap[3] = 0x33;   /* GIAC */
                cp.iac_lap[4] = 0x8b;
                cp.iac_lap[5] = 0x9e;
        } else {
                /* General discoverable mode */
                cp.num_iac = 1;
                cp.iac_lap[0] = 0x33;   /* GIAC */
                cp.iac_lap[1] = 0x8b;
                cp.iac_lap[2] = 0x9e;
        }

        return __hci_cmd_sync_status(hdev, HCI_OP_WRITE_CURRENT_IAC_LAP,
                                     (cp.num_iac * 3) + 1, &cp,
                                     HCI_CMD_TIMEOUT);
}

int hci_update_discoverable_sync(struct hci_dev *hdev)
{
        int err = 0;

        if (hci_dev_test_flag(hdev, HCI_BREDR_ENABLED)) {
                err = hci_write_iac_sync(hdev);
                if (err)
                        return err;

                err = hci_update_scan_sync(hdev);
                if (err)
                        return err;

                err = hci_update_class_sync(hdev);
                if (err)
                        return err;
        }

        /* Advertising instances don't use the global discoverable setting, so
         * only update AD if advertising was enabled using Set Advertising.
         */
        if (hci_dev_test_flag(hdev, HCI_ADVERTISING)) {
                err = hci_update_adv_data_sync(hdev, 0x00);
                if (err)
                        return err;

                /* Discoverable mode affects the local advertising
                 * address in limited privacy mode.
                 */
                if (hci_dev_test_flag(hdev, HCI_LIMITED_PRIVACY)) {
                        if (ext_adv_capable(hdev))
                                err = hci_start_ext_adv_sync(hdev, 0x00);
                        else
                                err = hci_enable_advertising_sync(hdev);
                }
        }

        return err;
}

static int update_discoverable_sync(struct hci_dev *hdev, void *data)
{
        return hci_update_discoverable_sync(hdev);
}

int hci_update_discoverable(struct hci_dev *hdev)
{
        /* Only queue if it would have any effect */
        if (hdev_is_powered(hdev) &&
            hci_dev_test_flag(hdev, HCI_ADVERTISING) &&
            hci_dev_test_flag(hdev, HCI_DISCOVERABLE) &&
            hci_dev_test_flag(hdev, HCI_LIMITED_PRIVACY))
                return hci_cmd_sync_queue(hdev, update_discoverable_sync, NULL,
                                          NULL);

        return 0;
}

int hci_update_connectable_sync(struct hci_dev *hdev)
{
        int err;

        err = hci_update_scan_sync(hdev);
        if (err)
                return err;

        /* If BR/EDR is not enabled and we disable advertising as a
         * by-product of disabling connectable, we need to update the
         * advertising flags.
         */
        if (!hci_dev_test_flag(hdev, HCI_BREDR_ENABLED))
                err = hci_update_adv_data_sync(hdev, hdev->cur_adv_instance);

        /* Update the advertising parameters if necessary */
        if (hci_dev_test_flag(hdev, HCI_ADVERTISING) ||
            !list_empty(&hdev->adv_instances)) {
                if (ext_adv_capable(hdev))
                        err = hci_start_ext_adv_sync(hdev,
                                                     hdev->cur_adv_instance);
                else
                        err = hci_enable_advertising_sync(hdev);

                if (err)
                        return err;
        }

        return hci_update_passive_scan_sync(hdev);
}

static int hci_inquiry_sync(struct hci_dev *hdev, u8 length)
{
        const u8 giac[3] = { 0x33, 0x8b, 0x9e };
        const u8 liac[3] = { 0x00, 0x8b, 0x9e };
        struct hci_cp_inquiry cp;

        bt_dev_dbg(hdev, "");

        if (hci_dev_test_flag(hdev, HCI_INQUIRY))
                return 0;

        hci_dev_lock(hdev);
        hci_inquiry_cache_flush(hdev);
        hci_dev_unlock(hdev);

        memset(&cp, 0, sizeof(cp));

        if (hdev->discovery.limited)
                memcpy(&cp.lap, liac, sizeof(cp.lap));
        else
                memcpy(&cp.lap, giac, sizeof(cp.lap));

        cp.length = length;

        return __hci_cmd_sync_status(hdev, HCI_OP_INQUIRY,
                                     sizeof(cp), &cp, HCI_CMD_TIMEOUT);
}

static int hci_active_scan_sync(struct hci_dev *hdev, uint16_t interval)
{
        u8 own_addr_type;
        /* Accept list is not used for discovery */
        u8 filter_policy = 0x00;
        /* Default is to enable duplicates filter */
        u8 filter_dup = LE_SCAN_FILTER_DUP_ENABLE;
        int err;

        bt_dev_dbg(hdev, "");

        /* If controller is scanning, it means the passive scanning is
         * running. Thus, we should temporarily stop it in order to set the
         * discovery scanning parameters.
         */
        err = hci_scan_disable_sync(hdev);
        if (err) {
                bt_dev_err(hdev, "Unable to disable scanning: %d", err);
                return err;
        }

        cancel_interleave_scan(hdev);

        /* Pause address resolution for active scan and stop advertising if
         * privacy is enabled.
         */
        err = hci_pause_addr_resolution(hdev);
        if (err)
                goto failed;

        /* All active scans will be done with either a resolvable private
         * address (when privacy feature has been enabled) or non-resolvable
         * private address.
         */
        err = hci_update_random_address_sync(hdev, true, scan_use_rpa(hdev),
                                             &own_addr_type);
        if (err < 0)
                own_addr_type = ADDR_LE_DEV_PUBLIC;

        if (hci_is_adv_monitoring(hdev)) {
                /* Duplicate filter should be disabled when some advertisement
                 * monitor is activated, otherwise AdvMon can only receive one
                 * advertisement for one peer(*) during active scanning, and
                 * might report loss to these peers.
                 *
                 * Note that different controllers have different meanings of
                 * |duplicate|. Some of them consider packets with the same
                 * address as duplicate, and others consider packets with the
                 * same address and the same RSSI as duplicate. Although in the
                 * latter case we don't need to disable duplicate filter, but
                 * it is common to have active scanning for a short period of
                 * time, the power impact should be neglectable.
                 */
                filter_dup = LE_SCAN_FILTER_DUP_DISABLE;
        }

        err = hci_start_scan_sync(hdev, LE_SCAN_ACTIVE, interval,
                                  hdev->le_scan_window_discovery,
                                  own_addr_type, filter_policy, filter_dup);
        if (!err)
                return err;

failed:
        /* Resume advertising if it was paused */
        if (use_ll_privacy(hdev))
                hci_resume_advertising_sync(hdev);

        /* Resume passive scanning */
        hci_update_passive_scan_sync(hdev);
        return err;
}

static int hci_start_interleaved_discovery_sync(struct hci_dev *hdev)
{
        int err;

        bt_dev_dbg(hdev, "");

        err = hci_active_scan_sync(hdev, hdev->le_scan_int_discovery * 2);
        if (err)
                return err;

        return hci_inquiry_sync(hdev, DISCOV_BREDR_INQUIRY_LEN);
}

int hci_start_discovery_sync(struct hci_dev *hdev)
{
        unsigned long timeout;
        int err;

        bt_dev_dbg(hdev, "type %u", hdev->discovery.type);

        switch (hdev->discovery.type) {
        case DISCOV_TYPE_BREDR:
                return hci_inquiry_sync(hdev, DISCOV_BREDR_INQUIRY_LEN);
        case DISCOV_TYPE_INTERLEAVED:
                /* When running simultaneous discovery, the LE scanning time
                 * should occupy the whole discovery time sine BR/EDR inquiry
                 * and LE scanning are scheduled by the controller.
                 *
                 * For interleaving discovery in comparison, BR/EDR inquiry
                 * and LE scanning are done sequentially with separate
                 * timeouts.
                 */
                if (test_bit(HCI_QUIRK_SIMULTANEOUS_DISCOVERY,
                             &hdev->quirks)) {
                        timeout = msecs_to_jiffies(DISCOV_LE_TIMEOUT);
                        /* During simultaneous discovery, we double LE scan
                         * interval. We must leave some time for the controller
                         * to do BR/EDR inquiry.
                         */
                        err = hci_start_interleaved_discovery_sync(hdev);
                        break;
                }

                timeout = msecs_to_jiffies(hdev->discov_interleaved_timeout);
                err = hci_active_scan_sync(hdev, hdev->le_scan_int_discovery);
                break;
        case DISCOV_TYPE_LE:
                timeout = msecs_to_jiffies(DISCOV_LE_TIMEOUT);
                err = hci_active_scan_sync(hdev, hdev->le_scan_int_discovery);
                break;
        default:
                return -EINVAL;
        }

        if (err)
                return err;

        bt_dev_dbg(hdev, "timeout %u ms", jiffies_to_msecs(timeout));

        /* When service discovery is used and the controller has a
         * strict duplicate filter, it is important to remember the
         * start and duration of the scan. This is required for
         * restarting scanning during the discovery phase.
         */
        if (test_bit(HCI_QUIRK_STRICT_DUPLICATE_FILTER, &hdev->quirks) &&
            hdev->discovery.result_filtering) {
                hdev->discovery.scan_start = jiffies;
                hdev->discovery.scan_duration = timeout;
        }

        queue_delayed_work(hdev->req_workqueue, &hdev->le_scan_disable,
                           timeout);
        return 0;
}

static void hci_suspend_monitor_sync(struct hci_dev *hdev)
{
        switch (hci_get_adv_monitor_offload_ext(hdev)) {
        case HCI_ADV_MONITOR_EXT_MSFT:
                msft_suspend_sync(hdev);
                break;
        default:
                return;
        }
}

/* This function disables discovery and mark it as paused */
static int hci_pause_discovery_sync(struct hci_dev *hdev)
{
        int old_state = hdev->discovery.state;
        int err;

        /* If discovery already stopped/stopping/paused there nothing to do */
        if (old_state == DISCOVERY_STOPPED || old_state == DISCOVERY_STOPPING ||
            hdev->discovery_paused)
                return 0;

        hci_discovery_set_state(hdev, DISCOVERY_STOPPING);
        err = hci_stop_discovery_sync(hdev);
        if (err)
                return err;

        hdev->discovery_paused = true;
        hdev->discovery_old_state = old_state;
        hci_discovery_set_state(hdev, DISCOVERY_STOPPED);

        return 0;
}

static int hci_update_event_filter_sync(struct hci_dev *hdev)
{
        struct bdaddr_list_with_flags *b;
        u8 scan = SCAN_DISABLED;
        bool scanning = test_bit(HCI_PSCAN, &hdev->flags);
        int err;

        if (!hci_dev_test_flag(hdev, HCI_BREDR_ENABLED))
                return 0;

        /* Some fake CSR controllers lock up after setting this type of
         * filter, so avoid sending the request altogether.
         */
        if (test_bit(HCI_QUIRK_BROKEN_FILTER_CLEAR_ALL, &hdev->quirks))
                return 0;

        /* Always clear event filter when starting */
        hci_clear_event_filter_sync(hdev);

        list_for_each_entry(b, &hdev->accept_list, list) {
                if (!(b->flags & HCI_CONN_FLAG_REMOTE_WAKEUP))
                        continue;

                bt_dev_dbg(hdev, "Adding event filters for %pMR", &b->bdaddr);

                err =  hci_set_event_filter_sync(hdev, HCI_FLT_CONN_SETUP,
                                                 HCI_CONN_SETUP_ALLOW_BDADDR,
                                                 &b->bdaddr,
                                                 HCI_CONN_SETUP_AUTO_ON);
                if (err)
                        bt_dev_dbg(hdev, "Failed to set event filter for %pMR",
                                   &b->bdaddr);
                else
                        scan = SCAN_PAGE;
        }

        if (scan && !scanning)
                hci_write_scan_enable_sync(hdev, scan);
        else if (!scan && scanning)
                hci_write_scan_enable_sync(hdev, scan);

        return 0;
}

/* This function disables scan (BR and LE) and mark it as paused */
static int hci_pause_scan_sync(struct hci_dev *hdev)
{
        if (hdev->scanning_paused)
                return 0;

        /* Disable page scan if enabled */
        if (test_bit(HCI_PSCAN, &hdev->flags))
                hci_write_scan_enable_sync(hdev, SCAN_DISABLED);

        hci_scan_disable_sync(hdev);

        hdev->scanning_paused = true;

        return 0;
}

/* This function performs the HCI suspend procedures in the follow order:
 *
 * Pause discovery (active scanning/inquiry)
 * Pause Directed Advertising/Advertising
 * Pause Scanning (passive scanning in case discovery was not active)
 * Disconnect all connections
 * Set suspend_status to BT_SUSPEND_DISCONNECT if hdev cannot wakeup
 * otherwise:
 * Update event mask (only set events that are allowed to wake up the host)
 * Update event filter (with devices marked with HCI_CONN_FLAG_REMOTE_WAKEUP)
 * Update passive scanning (lower duty cycle)
 * Set suspend_status to BT_SUSPEND_CONFIGURE_WAKE
 */
int hci_suspend_sync(struct hci_dev *hdev)
{
        int err;

        /* If marked as suspended there nothing to do */
        if (hdev->suspended)
                return 0;

        /* Mark device as suspended */
        hdev->suspended = true;

        /* Pause discovery if not already stopped */
        hci_pause_discovery_sync(hdev);

        /* Pause other advertisements */
        hci_pause_advertising_sync(hdev);

        /* Suspend monitor filters */
        hci_suspend_monitor_sync(hdev);

        /* Prevent disconnects from causing scanning to be re-enabled */
        hci_pause_scan_sync(hdev);

        if (hci_conn_count(hdev)) {
                /* Soft disconnect everything (power off) */
                err = hci_disconnect_all_sync(hdev, HCI_ERROR_REMOTE_POWER_OFF);
                if (err) {
                        /* Set state to BT_RUNNING so resume doesn't notify */
                        hdev->suspend_state = BT_RUNNING;
                        hci_resume_sync(hdev);
                        return err;
                }

                /* Update event mask so only the allowed event can wakeup the
                 * host.
                 */
                hci_set_event_mask_sync(hdev);
        }

        /* Only configure accept list if disconnect succeeded and wake
         * isn't being prevented.
         */
        if (!hdev->wakeup || !hdev->wakeup(hdev)) {
                hdev->suspend_state = BT_SUSPEND_DISCONNECT;
                return 0;
        }

        /* Unpause to take care of updating scanning params */
        hdev->scanning_paused = false;

        /* Enable event filter for paired devices */
        hci_update_event_filter_sync(hdev);

        /* Update LE passive scan if enabled */
        hci_update_passive_scan_sync(hdev);

        /* Pause scan changes again. */
        hdev->scanning_paused = true;

        hdev->suspend_state = BT_SUSPEND_CONFIGURE_WAKE;

        return 0;
}

/* This function resumes discovery */
static int hci_resume_discovery_sync(struct hci_dev *hdev)
{
        int err;

        /* If discovery not paused there nothing to do */
        if (!hdev->discovery_paused)
                return 0;

        hdev->discovery_paused = false;

        hci_discovery_set_state(hdev, DISCOVERY_STARTING);

        err = hci_start_discovery_sync(hdev);

        hci_discovery_set_state(hdev, err ? DISCOVERY_STOPPED :
                                DISCOVERY_FINDING);

        return err;
}

static void hci_resume_monitor_sync(struct hci_dev *hdev)
{
        switch (hci_get_adv_monitor_offload_ext(hdev)) {
        case HCI_ADV_MONITOR_EXT_MSFT:
                msft_resume_sync(hdev);
                break;
        default:
                return;
        }
}

/* This function resume scan and reset paused flag */
static int hci_resume_scan_sync(struct hci_dev *hdev)
{
        if (!hdev->scanning_paused)
                return 0;

        hdev->scanning_paused = false;

        hci_update_scan_sync(hdev);

        /* Reset passive scanning to normal */
        hci_update_passive_scan_sync(hdev);

        return 0;
}

/* This function performs the HCI suspend procedures in the follow order:
 *
 * Restore event mask
 * Clear event filter
 * Update passive scanning (normal duty cycle)
 * Resume Directed Advertising/Advertising
 * Resume discovery (active scanning/inquiry)
 */
int hci_resume_sync(struct hci_dev *hdev)
{
        /* If not marked as suspended there nothing to do */
        if (!hdev->suspended)
                return 0;

        hdev->suspended = false;

        /* Restore event mask */
        hci_set_event_mask_sync(hdev);

        /* Clear any event filters and restore scan state */
        hci_clear_event_filter_sync(hdev);

        /* Resume scanning */
        hci_resume_scan_sync(hdev);

        /* Resume monitor filters */
        hci_resume_monitor_sync(hdev);

        /* Resume other advertisements */
        hci_resume_advertising_sync(hdev);

        /* Resume discovery */
        hci_resume_discovery_sync(hdev);

        return 0;
}

static bool conn_use_rpa(struct hci_conn *conn)
{
        struct hci_dev *hdev = conn->hdev;

        return hci_dev_test_flag(hdev, HCI_PRIVACY);
}

static int hci_le_ext_directed_advertising_sync(struct hci_dev *hdev,
                                                struct hci_conn *conn)
{
        struct hci_cp_le_set_ext_adv_params cp;
        int err;
        bdaddr_t random_addr;
        u8 own_addr_type;

        err = hci_update_random_address_sync(hdev, false, conn_use_rpa(conn),
                                             &own_addr_type);
        if (err)
                return err;

        /* Set require_privacy to false so that the remote device has a
         * chance of identifying us.
         */
        err = hci_get_random_address(hdev, false, conn_use_rpa(conn), NULL,
                                     &own_addr_type, &random_addr);
        if (err)
                return err;

        memset(&cp, 0, sizeof(cp));

        cp.evt_properties = cpu_to_le16(LE_LEGACY_ADV_DIRECT_IND);
        cp.channel_map = hdev->le_adv_channel_map;
        cp.tx_power = HCI_TX_POWER_INVALID;
        cp.primary_phy = HCI_ADV_PHY_1M;
        cp.secondary_phy = HCI_ADV_PHY_1M;
        cp.handle = 0x00; /* Use instance 0 for directed adv */
        cp.own_addr_type = own_addr_type;
        cp.peer_addr_type = conn->dst_type;
        bacpy(&cp.peer_addr, &conn->dst);

        /* As per Core Spec 5.2 Vol 2, PART E, Sec 7.8.53, for
         * advertising_event_property LE_LEGACY_ADV_DIRECT_IND
         * does not supports advertising data when the advertising set already
         * contains some, the controller shall return erroc code 'Invalid
         * HCI Command Parameters(0x12).
         * So it is required to remove adv set for handle 0x00. since we use
         * instance 0 for directed adv.
         */
        err = hci_remove_ext_adv_instance_sync(hdev, cp.handle, NULL);
        if (err)
                return err;

        err = __hci_cmd_sync_status(hdev, HCI_OP_LE_SET_EXT_ADV_PARAMS,
                                    sizeof(cp), &cp, HCI_CMD_TIMEOUT);
        if (err)
                return err;

        /* Check if random address need to be updated */
        if (own_addr_type == ADDR_LE_DEV_RANDOM &&
            bacmp(&random_addr, BDADDR_ANY) &&
            bacmp(&random_addr, &hdev->random_addr)) {
                err = hci_set_adv_set_random_addr_sync(hdev, 0x00,
                                                       &random_addr);
                if (err)
                        return err;
        }

        return hci_enable_ext_advertising_sync(hdev, 0x00);
}

static int hci_le_directed_advertising_sync(struct hci_dev *hdev,
                                            struct hci_conn *conn)
{
        struct hci_cp_le_set_adv_param cp;
        u8 status;
        u8 own_addr_type;
        u8 enable;

        if (ext_adv_capable(hdev))
                return hci_le_ext_directed_advertising_sync(hdev, conn);

        /* Clear the HCI_LE_ADV bit temporarily so that the
         * hci_update_random_address knows that it's safe to go ahead
         * and write a new random address. The flag will be set back on
         * as soon as the SET_ADV_ENABLE HCI command completes.
         */
        hci_dev_clear_flag(hdev, HCI_LE_ADV);

        /* Set require_privacy to false so that the remote device has a
         * chance of identifying us.
         */
        status = hci_update_random_address_sync(hdev, false, conn_use_rpa(conn),
                                                &own_addr_type);
        if (status)
                return status;

        memset(&cp, 0, sizeof(cp));

        /* Some controllers might reject command if intervals are not
         * within range for undirected advertising.
         * BCM20702A0 is known to be affected by this.
         */
        cp.min_interval = cpu_to_le16(0x0020);
        cp.max_interval = cpu_to_le16(0x0020);

        cp.type = LE_ADV_DIRECT_IND;
        cp.own_address_type = own_addr_type;
        cp.direct_addr_type = conn->dst_type;
        bacpy(&cp.direct_addr, &conn->dst);
        cp.channel_map = hdev->le_adv_channel_map;

        status = __hci_cmd_sync_status(hdev, HCI_OP_LE_SET_ADV_PARAM,
                                       sizeof(cp), &cp, HCI_CMD_TIMEOUT);
        if (status)
                return status;

        enable = 0x01;

        return __hci_cmd_sync_status(hdev, HCI_OP_LE_SET_ADV_ENABLE,
                                     sizeof(enable), &enable, HCI_CMD_TIMEOUT);
}

static void set_ext_conn_params(struct hci_conn *conn,
                                struct hci_cp_le_ext_conn_param *p)
{
        struct hci_dev *hdev = conn->hdev;

        memset(p, 0, sizeof(*p));

        p->scan_interval = cpu_to_le16(hdev->le_scan_int_connect);
        p->scan_window = cpu_to_le16(hdev->le_scan_window_connect);
        p->conn_interval_min = cpu_to_le16(conn->le_conn_min_interval);
        p->conn_interval_max = cpu_to_le16(conn->le_conn_max_interval);
        p->conn_latency = cpu_to_le16(conn->le_conn_latency);
        p->supervision_timeout = cpu_to_le16(conn->le_supv_timeout);
        p->min_ce_len = cpu_to_le16(0x0000);
        p->max_ce_len = cpu_to_le16(0x0000);
}

static int hci_le_ext_create_conn_sync(struct hci_dev *hdev,
                                       struct hci_conn *conn, u8 own_addr_type)
{
        struct hci_cp_le_ext_create_conn *cp;
        struct hci_cp_le_ext_conn_param *p;
        u8 data[sizeof(*cp) + sizeof(*p) * 3];
        u32 plen;

        cp = (void *)data;
        p = (void *)cp->data;

        memset(cp, 0, sizeof(*cp));

        bacpy(&cp->peer_addr, &conn->dst);
        cp->peer_addr_type = conn->dst_type;
        cp->own_addr_type = own_addr_type;

        plen = sizeof(*cp);

        if (scan_1m(hdev)) {
                cp->phys |= LE_SCAN_PHY_1M;
                set_ext_conn_params(conn, p);

                p++;
                plen += sizeof(*p);
        }

        if (scan_2m(hdev)) {
                cp->phys |= LE_SCAN_PHY_2M;
                set_ext_conn_params(conn, p);

                p++;
                plen += sizeof(*p);
        }

        if (scan_coded(hdev)) {
                cp->phys |= LE_SCAN_PHY_CODED;
                set_ext_conn_params(conn, p);

                plen += sizeof(*p);
        }

        return __hci_cmd_sync_status_sk(hdev, HCI_OP_LE_EXT_CREATE_CONN,
                                        plen, data,
                                        HCI_EV_LE_ENHANCED_CONN_COMPLETE,
                                        conn->conn_timeout, NULL);
}

int hci_le_create_conn_sync(struct hci_dev *hdev, struct hci_conn *conn)
{
        struct hci_cp_le_create_conn cp;
        struct hci_conn_params *params;
        u8 own_addr_type;
        int err;

        /* If requested to connect as peripheral use directed advertising */
        if (conn->role == HCI_ROLE_SLAVE) {
                /* If we're active scanning and simultaneous roles is not
                 * enabled simply reject the attempt.
                 */
                if (hci_dev_test_flag(hdev, HCI_LE_SCAN) &&
                    hdev->le_scan_type == LE_SCAN_ACTIVE &&
                    !hci_dev_test_flag(hdev, HCI_LE_SIMULTANEOUS_ROLES)) {
                        hci_conn_del(conn);
                        return -EBUSY;
                }

                /* Pause advertising while doing directed advertising. */
                hci_pause_advertising_sync(hdev);

                err = hci_le_directed_advertising_sync(hdev, conn);
                goto done;
        }

        /* Disable advertising if simultaneous roles is not in use. */
        if (!hci_dev_test_flag(hdev, HCI_LE_SIMULTANEOUS_ROLES))
                hci_pause_advertising_sync(hdev);

        params = hci_conn_params_lookup(hdev, &conn->dst, conn->dst_type);
        if (params) {
                conn->le_conn_min_interval = params->conn_min_interval;
                conn->le_conn_max_interval = params->conn_max_interval;
                conn->le_conn_latency = params->conn_latency;
                conn->le_supv_timeout = params->supervision_timeout;
        } else {
                conn->le_conn_min_interval = hdev->le_conn_min_interval;
                conn->le_conn_max_interval = hdev->le_conn_max_interval;
                conn->le_conn_latency = hdev->le_conn_latency;
                conn->le_supv_timeout = hdev->le_supv_timeout;
        }

        /* If controller is scanning, we stop it since some controllers are
         * not able to scan and connect at the same time. Also set the
         * HCI_LE_SCAN_INTERRUPTED flag so that the command complete
         * handler for scan disabling knows to set the correct discovery
         * state.
         */
        if (hci_dev_test_flag(hdev, HCI_LE_SCAN)) {
                hci_scan_disable_sync(hdev);
                hci_dev_set_flag(hdev, HCI_LE_SCAN_INTERRUPTED);
        }

        /* Update random address, but set require_privacy to false so
         * that we never connect with an non-resolvable address.
         */
        err = hci_update_random_address_sync(hdev, false, conn_use_rpa(conn),
                                             &own_addr_type);
        if (err)
                goto done;

        if (use_ext_conn(hdev)) {
                err = hci_le_ext_create_conn_sync(hdev, conn, own_addr_type);
                goto done;
        }

        memset(&cp, 0, sizeof(cp));

        cp.scan_interval = cpu_to_le16(hdev->le_scan_int_connect);
        cp.scan_window = cpu_to_le16(hdev->le_scan_window_connect);

        bacpy(&cp.peer_addr, &conn->dst);
        cp.peer_addr_type = conn->dst_type;
        cp.own_address_type = own_addr_type;
        cp.conn_interval_min = cpu_to_le16(conn->le_conn_min_interval);
        cp.conn_interval_max = cpu_to_le16(conn->le_conn_max_interval);
        cp.conn_latency = cpu_to_le16(conn->le_conn_latency);
        cp.supervision_timeout = cpu_to_le16(conn->le_supv_timeout);
        cp.min_ce_len = cpu_to_le16(0x0000);
        cp.max_ce_len = cpu_to_le16(0x0000);

        /* BLUETOOTH CORE SPECIFICATION Version 5.3 | Vol 4, Part E page 2261:
         *
         * If this event is unmasked and the HCI_LE_Connection_Complete event
         * is unmasked, only the HCI_LE_Enhanced_Connection_Complete event is
         * sent when a new connection has been created.
         */
        err = __hci_cmd_sync_status_sk(hdev, HCI_OP_LE_CREATE_CONN,
                                       sizeof(cp), &cp,
                                       use_enhanced_conn_complete(hdev) ?
                                       HCI_EV_LE_ENHANCED_CONN_COMPLETE :
                                       HCI_EV_LE_CONN_COMPLETE,
                                       conn->conn_timeout, NULL);

done:
        if (err == -ETIMEDOUT)
                hci_le_connect_cancel_sync(hdev, conn);

        /* Re-enable advertising after the connection attempt is finished. */
        hci_resume_advertising_sync(hdev);
        return err;
}

int hci_le_create_cis_sync(struct hci_dev *hdev, struct hci_conn *conn)
{
        struct {
                struct hci_cp_le_create_cis cp;
                struct hci_cis cis[0x1f];
        } cmd;
        u8 cig;
        struct hci_conn *hcon = conn;

        memset(&cmd, 0, sizeof(cmd));
        cmd.cis[0].acl_handle = cpu_to_le16(conn->parent->handle);
        cmd.cis[0].cis_handle = cpu_to_le16(conn->handle);
        cmd.cp.num_cis++;
        cig = conn->iso_qos.ucast.cig;

        hci_dev_lock(hdev);

        rcu_read_lock();

        list_for_each_entry_rcu(conn, &hdev->conn_hash.list, list) {
                struct hci_cis *cis = &cmd.cis[cmd.cp.num_cis];

                if (conn == hcon || conn->type != ISO_LINK ||
                    conn->state == BT_CONNECTED ||
                    conn->iso_qos.ucast.cig != cig)
                        continue;

                /* Check if all CIS(s) belonging to a CIG are ready */
                if (!conn->parent || conn->parent->state != BT_CONNECTED ||
                    conn->state != BT_CONNECT) {
                        cmd.cp.num_cis = 0;
                        break;
                }

                /* Group all CIS with state BT_CONNECT since the spec don't
                 * allow to send them individually:
                 *
                 * BLUETOOTH CORE SPECIFICATION Version 5.3 | Vol 4, Part E
                 * page 2566:
                 *
                 * If the Host issues this command before all the
                 * HCI_LE_CIS_Established events from the previous use of the
                 * command have been generated, the Controller shall return the
                 * error code Command Disallowed (0x0C).
                 */
                cis->acl_handle = cpu_to_le16(conn->parent->handle);
                cis->cis_handle = cpu_to_le16(conn->handle);
                cmd.cp.num_cis++;
        }

        rcu_read_unlock();

        hci_dev_unlock(hdev);

        if (!cmd.cp.num_cis)
                return 0;

        /* Wait for HCI_LE_CIS_Established */
        return __hci_cmd_sync_status_sk(hdev, HCI_OP_LE_CREATE_CIS,
                                        sizeof(cmd.cp) + sizeof(cmd.cis[0]) *
                                        cmd.cp.num_cis, &cmd,
                                        HCI_EVT_LE_CIS_ESTABLISHED,
                                        conn->conn_timeout, NULL);
}

int hci_le_remove_cig_sync(struct hci_dev *hdev, u8 handle)
{
        struct hci_cp_le_remove_cig cp;

        memset(&cp, 0, sizeof(cp));
        cp.cig_id = handle;

        return __hci_cmd_sync_status(hdev, HCI_OP_LE_REMOVE_CIG, sizeof(cp),
                                     &cp, HCI_CMD_TIMEOUT);
}

int hci_le_big_terminate_sync(struct hci_dev *hdev, u8 handle)
{
        struct hci_cp_le_big_term_sync cp;

        memset(&cp, 0, sizeof(cp));
        cp.handle = handle;

        return __hci_cmd_sync_status(hdev, HCI_OP_LE_BIG_TERM_SYNC,
                                     sizeof(cp), &cp, HCI_CMD_TIMEOUT);
}

int hci_le_pa_terminate_sync(struct hci_dev *hdev, u16 handle)
{
        struct hci_cp_le_pa_term_sync cp;

        memset(&cp, 0, sizeof(cp));
        cp.handle = cpu_to_le16(handle);

        return __hci_cmd_sync_status(hdev, HCI_OP_LE_PA_TERM_SYNC,
                                     sizeof(cp), &cp, HCI_CMD_TIMEOUT);
}

int hci_get_random_address(struct hci_dev *hdev, bool require_privacy,
                           bool use_rpa, struct adv_info *adv_instance,
                           u8 *own_addr_type, bdaddr_t *rand_addr)
{
        int err;

        bacpy(rand_addr, BDADDR_ANY);

        /* If privacy is enabled use a resolvable private address. If
         * current RPA has expired then generate a new one.
         */
        if (use_rpa) {
                /* If Controller supports LL Privacy use own address type is
                 * 0x03
                 */
                if (use_ll_privacy(hdev))
                        *own_addr_type = ADDR_LE_DEV_RANDOM_RESOLVED;
                else
                        *own_addr_type = ADDR_LE_DEV_RANDOM;

                if (adv_instance) {
                        if (adv_rpa_valid(adv_instance))
                                return 0;
                } else {
                        if (rpa_valid(hdev))
                                return 0;
                }

                err = smp_generate_rpa(hdev, hdev->irk, &hdev->rpa);
                if (err < 0) {
                        bt_dev_err(hdev, "failed to generate new RPA");
                        return err;
                }

                bacpy(rand_addr, &hdev->rpa);

                return 0;
        }

        /* In case of required privacy without resolvable private address,
         * use an non-resolvable private address. This is useful for
         * non-connectable advertising.
         */
        if (require_privacy) {
                bdaddr_t nrpa;

                while (true) {
                        /* The non-resolvable private address is generated
                         * from random six bytes with the two most significant
                         * bits cleared.
                         */
                        get_random_bytes(&nrpa, 6);
                        nrpa.b[5] &= 0x3f;

                        /* The non-resolvable private address shall not be
                         * equal to the public address.
                         */
                        if (bacmp(&hdev->bdaddr, &nrpa))
                                break;
                }

                *own_addr_type = ADDR_LE_DEV_RANDOM;
                bacpy(rand_addr, &nrpa);

                return 0;
        }

        /* No privacy so use a public address. */
        *own_addr_type = ADDR_LE_DEV_PUBLIC;

        return 0;
}

static int _update_adv_data_sync(struct hci_dev *hdev, void *data)
{
        u8 instance = PTR_ERR(data);

        return hci_update_adv_data_sync(hdev, instance);
}

int hci_update_adv_data(struct hci_dev *hdev, u8 instance)
{
        return hci_cmd_sync_queue(hdev, _update_adv_data_sync,
                                  ERR_PTR(instance), NULL);
}