drivers/hid/amd-sfh-hid/amd_sfh_hid.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * AMD MP2 Sensors transport driver
   4  *
   5  * Authors: Nehal Bakulchandra Shah <Nehal-bakulchandra.shah@amd.com>
   6  *          Sandeep Singh <sandeep.singh@amd.com>
   7  */
   8 #include <linux/hid.h>
   9 #include <linux/wait.h>
  10 #include <linux/sched.h>
  11
  12 #include "amd_sfh_hid.h"
  13
  14 #define AMD_SFH_RESPONSE_TIMEOUT        1500
  15
  16 /**
  17  * amdtp_hid_parse() - hid-core .parse() callback
  18  * @hid:        hid device instance
  19  *
  20  * This function gets called during call to hid_add_device
  21  *
  22  * Return: 0 on success and non zero on error
  23  */
  24 static int amdtp_hid_parse(struct hid_device *hid)
  25 {
  26         struct amdtp_hid_data *hid_data = hid->driver_data;
  27         struct amdtp_cl_data *cli_data = hid_data->cli_data;
  28
  29         return hid_parse_report(hid, cli_data->report_descr[hid_data->index],
  30                               cli_data->report_descr_sz[hid_data->index]);
  31 }
  32
  33 /* Empty callbacks with success return code */
  34 static int amdtp_hid_start(struct hid_device *hid)
  35 {
  36         return 0;
  37 }
  38
  39 static void amdtp_hid_stop(struct hid_device *hid)
  40 {
  41 }
  42
  43 static int amdtp_hid_open(struct hid_device *hid)
  44 {
  45         return 0;
  46 }
  47
  48 static void amdtp_hid_close(struct hid_device *hid)
  49 {
  50 }
  51
  52 static int amdtp_raw_request(struct hid_device *hdev, u8 reportnum,
  53                              u8 *buf, size_t len, u8 rtype, int reqtype)
  54 {
  55         return 0;
  56 }
  57
  58 static void amdtp_hid_request(struct hid_device *hid, struct hid_report *rep, int reqtype)
  59 {
  60         int rc;
  61
  62         switch (reqtype) {
  63         case HID_REQ_GET_REPORT:
  64                 rc = amd_sfh_get_report(hid, rep->id, rep->type);
  65                 if (rc)
  66                         dev_err(&hid->dev, "AMDSFH  get report error\n");
  67                 break;
  68         case HID_REQ_SET_REPORT:
  69                 amd_sfh_set_report(hid, rep->id, reqtype);
  70                 break;
  71         default:
  72                 break;
  73         }
  74 }
  75
  76 static int amdtp_wait_for_response(struct hid_device *hid)
  77 {
  78         struct amdtp_hid_data *hid_data =  hid->driver_data;
  79         struct amdtp_cl_data *cli_data = hid_data->cli_data;
  80         int i, ret = 0;
  81
  82         for (i = 0; i < cli_data->num_hid_devices; i++) {
  83                 if (cli_data->hid_sensor_hubs[i] == hid)
  84                         break;
  85         }
  86
  87         if (!cli_data->request_done[i])
  88                 ret = wait_event_interruptible_timeout(hid_data->hid_wait,
  89                                                        cli_data->request_done[i],
  90                                                        msecs_to_jiffies(AMD_SFH_RESPONSE_TIMEOUT));
  91         if (ret == -ERESTARTSYS)
  92                 return -ERESTARTSYS;
  93         else if (ret < 0)
  94                 return -ETIMEDOUT;
  95         else
  96                 return 0;
  97 }
  98
  99 void amdtp_hid_wakeup(struct hid_device *hid)
 100 {
 101         struct amdtp_hid_data *hid_data = hid->driver_data;
 102         struct amdtp_cl_data *cli_data = hid_data->cli_data;
 103
 104         cli_data->request_done[cli_data->cur_hid_dev] = true;
 105         wake_up_interruptible(&hid_data->hid_wait);
 106 }
 107
 108 static struct hid_ll_driver amdtp_hid_ll_driver = {
 109         .parse  =       amdtp_hid_parse,
 110         .start  =       amdtp_hid_start,
 111         .stop   =       amdtp_hid_stop,
 112         .open   =       amdtp_hid_open,
 113         .close  =       amdtp_hid_close,
 114         .request  =     amdtp_hid_request,
 115         .wait   =       amdtp_wait_for_response,
 116         .raw_request  = amdtp_raw_request,
 117 };
 118
 119 int amdtp_hid_probe(u32 cur_hid_dev, struct amdtp_cl_data *cli_data)
 120 {
 121         struct hid_device *hid;
 122         struct amdtp_hid_data *hid_data;
 123         int rc;
 124
 125         hid = hid_allocate_device();
 126         if (IS_ERR(hid))
 127                 return PTR_ERR(hid);
 128
 129         hid_data = kzalloc(sizeof(*hid_data), GFP_KERNEL);
 130         if (!hid_data) {
 131                 rc = -ENOMEM;
 132                 goto err_hid_data;
 133         }
 134
 135         hid->ll_driver = &amdtp_hid_ll_driver;
 136         hid_data->index = cur_hid_dev;
 137         hid_data->cli_data = cli_data;
 138         init_waitqueue_head(&hid_data->hid_wait);
 139
 140         hid->driver_data = hid_data;
 141         cli_data->hid_sensor_hubs[cur_hid_dev] = hid;
 142         hid->bus = BUS_AMD_AMDTP;
 143         hid->vendor = AMD_SFH_HID_VENDOR;
 144         hid->product = AMD_SFH_HID_PRODUCT;
 145         snprintf(hid->name, sizeof(hid->name), "%s %04X:%04X", "hid-amdtp",
 146                  hid->vendor, hid->product);
 147
 148         rc = hid_add_device(hid);
 149         if (rc)
 150                 goto err_hid_device;
 151         return 0;
 152
 153 err_hid_device:
 154         kfree(hid_data);
 155 err_hid_data:
 156         hid_destroy_device(hid);
 157         return rc;
 158 }
 159
 160 void amdtp_hid_remove(struct amdtp_cl_data *cli_data)
 161 {
 162         int i;
 163
 164         for (i = 0; i < cli_data->num_hid_devices; ++i) {
 165                 if (cli_data->hid_sensor_hubs[i]) {
 166                         kfree(cli_data->hid_sensor_hubs[i]->driver_data);
 167                         hid_destroy_device(cli_data->hid_sensor_hubs[i]);
 168                         cli_data->hid_sensor_hubs[i] = NULL;
 169                 }
 170         }
 171 }