drivers/bluetooth/btqcomsmd.c

   1 /*
   2  * Copyright (c) 2016, Linaro Ltd.
   3  * Copyright (c) 2015, Sony Mobile Communications Inc.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License version 2 and
   7  * only version 2 as published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  */
  14
  15 #include <linux/module.h>
  16 #include <linux/slab.h>
  17 #include <linux/rpmsg.h>
  18 #include <linux/of.h>
  19
  20 #include <linux/soc/qcom/wcnss_ctrl.h>
  21 #include <linux/platform_device.h>
  22
  23 #include <net/bluetooth/bluetooth.h>
  24 #include <net/bluetooth/hci_core.h>
  25
  26 #include "btqca.h"
  27
  28 struct btqcomsmd {
  29         struct hci_dev *hdev;
  30
  31         struct rpmsg_endpoint *acl_channel;
  32         struct rpmsg_endpoint *cmd_channel;
  33 };
  34
  35 static int btqcomsmd_recv(struct hci_dev *hdev, unsigned int type,
  36                            const void *data, size_t count)
  37 {
  38         struct sk_buff *skb;
  39
  40         /* Use GFP_ATOMIC as we're in IRQ context */
  41         skb = bt_skb_alloc(count, GFP_ATOMIC);
  42         if (!skb) {
  43                 hdev->stat.err_rx++;
  44                 return -ENOMEM;
  45         }
  46
  47         hci_skb_pkt_type(skb) = type;
  48         skb_put_data(skb, data, count);
  49
  50         return hci_recv_frame(hdev, skb);
  51 }
  52
  53 static int btqcomsmd_acl_callback(struct rpmsg_device *rpdev, void *data,
  54                                   int count, void *priv, u32 addr)
  55 {
  56         struct btqcomsmd *btq = priv;
  57
  58         btq->hdev->stat.byte_rx += count;
  59         return btqcomsmd_recv(btq->hdev, HCI_ACLDATA_PKT, data, count);
  60 }
  61
  62 static int btqcomsmd_cmd_callback(struct rpmsg_device *rpdev, void *data,
  63                                   int count, void *priv, u32 addr)
  64 {
  65         struct btqcomsmd *btq = priv;
  66
  67         btq->hdev->stat.byte_rx += count;
  68         return btqcomsmd_recv(btq->hdev, HCI_EVENT_PKT, data, count);
  69 }
  70
  71 static int btqcomsmd_send(struct hci_dev *hdev, struct sk_buff *skb)
  72 {
  73         struct btqcomsmd *btq = hci_get_drvdata(hdev);
  74         int ret;
  75
  76         switch (hci_skb_pkt_type(skb)) {
  77         case HCI_ACLDATA_PKT:
  78                 ret = rpmsg_send(btq->acl_channel, skb->data, skb->len);
  79                 if (ret) {
  80                         hdev->stat.err_tx++;
  81                         break;
  82                 }
  83                 hdev->stat.acl_tx++;
  84                 hdev->stat.byte_tx += skb->len;
  85                 break;
  86         case HCI_COMMAND_PKT:
  87                 ret = rpmsg_send(btq->cmd_channel, skb->data, skb->len);
  88                 if (ret) {
  89                         hdev->stat.err_tx++;
  90                         break;
  91                 }
  92                 hdev->stat.cmd_tx++;
  93                 hdev->stat.byte_tx += skb->len;
  94                 break;
  95         default:
  96                 ret = -EILSEQ;
  97                 break;
  98         }
  99
 100         if (!ret)
 101                 kfree_skb(skb);
 102
 103         return ret;
 104 }
 105
 106 static int btqcomsmd_open(struct hci_dev *hdev)
 107 {
 108         return 0;
 109 }
 110
 111 static int btqcomsmd_close(struct hci_dev *hdev)
 112 {
 113         return 0;
 114 }
 115
 116 static int btqcomsmd_setup(struct hci_dev *hdev)
 117 {
 118         struct sk_buff *skb;
 119
 120         skb = __hci_cmd_sync(hdev, HCI_OP_RESET, 0, NULL, HCI_INIT_TIMEOUT);
 121         if (IS_ERR(skb))
 122                 return PTR_ERR(skb);
 123         kfree_skb(skb);
 124
 125         /* Devices do not have persistent storage for BD address. Retrieve
 126          * it from the firmware node property.
 127          */
 128         set_bit(HCI_QUIRK_USE_BDADDR_PROPERTY, &hdev->quirks);
 129
 130         return 0;
 131 }
 132
 133 static int btqcomsmd_probe(struct platform_device *pdev)
 134 {
 135         struct btqcomsmd *btq;
 136         struct hci_dev *hdev;
 137         void *wcnss;
 138         int ret;
 139
 140         btq = devm_kzalloc(&pdev->dev, sizeof(*btq), GFP_KERNEL);
 141         if (!btq)
 142                 return -ENOMEM;
 143
 144         wcnss = dev_get_drvdata(pdev->dev.parent);
 145
 146         btq->acl_channel = qcom_wcnss_open_channel(wcnss, "APPS_RIVA_BT_ACL",
 147                                                    btqcomsmd_acl_callback, btq);
 148         if (IS_ERR(btq->acl_channel))
 149                 return PTR_ERR(btq->acl_channel);
 150
 151         btq->cmd_channel = qcom_wcnss_open_channel(wcnss, "APPS_RIVA_BT_CMD",
 152                                                    btqcomsmd_cmd_callback, btq);
 153         if (IS_ERR(btq->cmd_channel))
 154                 return PTR_ERR(btq->cmd_channel);
 155
 156         hdev = hci_alloc_dev();
 157         if (!hdev)
 158                 return -ENOMEM;
 159
 160         hci_set_drvdata(hdev, btq);
 161         btq->hdev = hdev;
 162         SET_HCIDEV_DEV(hdev, &pdev->dev);
 163
 164         hdev->bus = HCI_SMD;
 165         hdev->open = btqcomsmd_open;
 166         hdev->close = btqcomsmd_close;
 167         hdev->send = btqcomsmd_send;
 168         hdev->setup = btqcomsmd_setup;
 169         hdev->set_bdaddr = qca_set_bdaddr_rome;
 170
 171         ret = hci_register_dev(hdev);
 172         if (ret < 0) {
 173                 hci_free_dev(hdev);
 174                 return ret;
 175         }
 176
 177         platform_set_drvdata(pdev, btq);
 178
 179         return 0;
 180 }
 181
 182 static int btqcomsmd_remove(struct platform_device *pdev)
 183 {
 184         struct btqcomsmd *btq = platform_get_drvdata(pdev);
 185
 186         hci_unregister_dev(btq->hdev);
 187         hci_free_dev(btq->hdev);
 188
 189         rpmsg_destroy_ept(btq->cmd_channel);
 190         rpmsg_destroy_ept(btq->acl_channel);
 191
 192         return 0;
 193 }
 194
 195 static const struct of_device_id btqcomsmd_of_match[] = {
 196         { .compatible = "qcom,wcnss-bt", },
 197         { },
 198 };
 199 MODULE_DEVICE_TABLE(of, btqcomsmd_of_match);
 200
 201 static struct platform_driver btqcomsmd_driver = {
 202         .probe = btqcomsmd_probe,
 203         .remove = btqcomsmd_remove,
 204         .driver  = {
 205                 .name  = "btqcomsmd",
 206                 .of_match_table = btqcomsmd_of_match,
 207         },
 208 };
 209
 210 module_platform_driver(btqcomsmd_driver);
 211
 212 MODULE_AUTHOR("Bjorn Andersson <bjorn.andersson@sonymobile.com>");
 213 MODULE_DESCRIPTION("Qualcomm SMD HCI driver");
 214 MODULE_LICENSE("GPL v2");