drivers/hid/intel-ish-hid/ishtp-hid.c

   1 /*
   2  * ISHTP-HID glue driver.
   3  *
   4  * Copyright (c) 2012-2016, Intel Corporation.
   5  *
   6  * This program is free software; you can redistribute it and/or modify it
   7  * under the terms and conditions of the GNU General Public License,
   8  * version 2, as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope it will be useful, but WITHOUT
  11  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  12  * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
  13  * more details.
  14  */
  15
  16 #include <linux/hid.h>
  17 #include <uapi/linux/input.h>
  18 #include "ishtp/client.h"
  19 #include "ishtp-hid.h"
  20
  21 /**
  22  * ishtp_hid_parse() - hid-core .parse() callback
  23  * @hid:        hid device instance
  24  *
  25  * This function gets called during call to hid_add_device
  26  *
  27  * Return: 0 on success and non zero on error
  28  */
  29 static int ishtp_hid_parse(struct hid_device *hid)
  30 {
  31         struct ishtp_hid_data *hid_data =  hid->driver_data;
  32         struct ishtp_cl_data *client_data = hid_data->client_data;
  33         int rv;
  34
  35         rv = hid_parse_report(hid, client_data->report_descr[hid_data->index],
  36                               client_data->report_descr_size[hid_data->index]);
  37         if (rv)
  38                 return  rv;
  39
  40         return 0;
  41 }
  42
  43 /* Empty callbacks with success return code */
  44 static int ishtp_hid_start(struct hid_device *hid)
  45 {
  46         return 0;
  47 }
  48
  49 static void ishtp_hid_stop(struct hid_device *hid)
  50 {
  51 }
  52
  53 static int ishtp_hid_open(struct hid_device *hid)
  54 {
  55         return 0;
  56 }
  57
  58 static void ishtp_hid_close(struct hid_device *hid)
  59 {
  60 }
  61
  62 static int ishtp_raw_request(struct hid_device *hdev, unsigned char reportnum,
  63         __u8 *buf, size_t len, unsigned char rtype, int reqtype)
  64 {
  65         return 0;
  66 }
  67
  68 /**
  69  * ishtp_hid_request() - hid-core .request() callback
  70  * @hid:        hid device instance
  71  * @rep:        pointer to hid_report
  72  * @reqtype:    type of req. [GET|SET]_REPORT
  73  *
  74  * This function is used to set/get feaure/input report.
  75  */
  76 static void ishtp_hid_request(struct hid_device *hid, struct hid_report *rep,
  77         int reqtype)
  78 {
  79         struct ishtp_hid_data *hid_data =  hid->driver_data;
  80         /* the specific report length, just HID part of it */
  81         unsigned int len = ((rep->size - 1) >> 3) + 1 + (rep->id > 0);
  82         char *buf;
  83         unsigned int header_size = sizeof(struct hostif_msg);
  84
  85         len += header_size;
  86
  87         hid_data->request_done = false;
  88         switch (reqtype) {
  89         case HID_REQ_GET_REPORT:
  90                 hid_ishtp_get_report(hid, rep->id, rep->type);
  91                 break;
  92         case HID_REQ_SET_REPORT:
  93                 /*
  94                  * Spare 7 bytes for 64b accesses through
  95                  * get/put_unaligned_le64()
  96                  */
  97                 buf = kzalloc(len + 7, GFP_KERNEL);
  98                 if (!buf)
  99                         return;
 100
 101                 hid_output_report(rep, buf + header_size);
 102                 hid_ishtp_set_feature(hid, buf, len, rep->id);
 103                 kfree(buf);
 104                 break;
 105         }
 106 }
 107
 108 /**
 109  * ishtp_wait_for_response() - hid-core .wait() callback
 110  * @hid:        hid device instance
 111  *
 112  * This function is used to wait after get feaure/input report.
 113  *
 114  * Return: 0 on success and non zero on error
 115  */
 116 static int ishtp_wait_for_response(struct hid_device *hid)
 117 {
 118         struct ishtp_hid_data *hid_data =  hid->driver_data;
 119         struct ishtp_cl_data *client_data = hid_data->client_data;
 120         int rv;
 121
 122         hid_ishtp_trace(client_data,  "%s hid %p\n", __func__, hid);
 123
 124         rv = ishtp_hid_link_ready_wait(hid_data->client_data);
 125         if (rv)
 126                 return rv;
 127
 128         if (!hid_data->request_done)
 129                 wait_event_interruptible_timeout(hid_data->hid_wait,
 130                                         hid_data->request_done, 3 * HZ);
 131
 132         if (!hid_data->request_done) {
 133                 hid_err(hid,
 134                         "timeout waiting for response from ISHTP device\n");
 135                 return -ETIMEDOUT;
 136         }
 137         hid_ishtp_trace(client_data,  "%s hid %p done\n", __func__, hid);
 138
 139         hid_data->request_done = false;
 140
 141         return 0;
 142 }
 143
 144 /**
 145  * ishtp_hid_wakeup() - Wakeup caller
 146  * @hid:        hid device instance
 147  *
 148  * This function will wakeup caller waiting for Get/Set feature report
 149  */
 150 void ishtp_hid_wakeup(struct hid_device *hid)
 151 {
 152         struct ishtp_hid_data *hid_data = hid->driver_data;
 153
 154         hid_data->request_done = true;
 155         wake_up_interruptible(&hid_data->hid_wait);
 156 }
 157
 158 static struct hid_ll_driver ishtp_hid_ll_driver = {
 159         .parse = ishtp_hid_parse,
 160         .start = ishtp_hid_start,
 161         .stop = ishtp_hid_stop,
 162         .open = ishtp_hid_open,
 163         .close = ishtp_hid_close,
 164         .request = ishtp_hid_request,
 165         .wait = ishtp_wait_for_response,
 166         .raw_request = ishtp_raw_request
 167 };
 168
 169 /**
 170  * ishtp_hid_probe() - hid register ll driver
 171  * @cur_hid_dev:        Index of hid device calling to register
 172  * @client_data:        Client data pointer
 173  *
 174  * This function is used to allocate and add HID device.
 175  *
 176  * Return: 0 on success, non zero on error
 177  */
 178 int ishtp_hid_probe(unsigned int cur_hid_dev,
 179                     struct ishtp_cl_data *client_data)
 180 {
 181         int rv;
 182         struct hid_device *hid;
 183         struct ishtp_hid_data *hid_data;
 184
 185         hid = hid_allocate_device();
 186         if (IS_ERR(hid)) {
 187                 rv = PTR_ERR(hid);
 188                 return  -ENOMEM;
 189         }
 190
 191         hid_data = kzalloc(sizeof(*hid_data), GFP_KERNEL);
 192         if (!hid_data) {
 193                 rv = -ENOMEM;
 194                 goto err_hid_data;
 195         }
 196
 197         hid_data->index = cur_hid_dev;
 198         hid_data->client_data = client_data;
 199         init_waitqueue_head(&hid_data->hid_wait);
 200
 201         hid->driver_data = hid_data;
 202
 203         client_data->hid_sensor_hubs[cur_hid_dev] = hid;
 204
 205         hid->ll_driver = &ishtp_hid_ll_driver;
 206         hid->bus = BUS_INTEL_ISHTP;
 207         hid->dev.parent = &client_data->cl_device->dev;
 208         hid->version = le16_to_cpu(ISH_HID_VERSION);
 209         hid->vendor = le16_to_cpu(ISH_HID_VENDOR);
 210         hid->product = le16_to_cpu(ISH_HID_PRODUCT);
 211         snprintf(hid->name, sizeof(hid->name), "%s %04X:%04X", "hid-ishtp",
 212                 hid->vendor, hid->product);
 213
 214         rv = hid_add_device(hid);
 215         if (rv)
 216                 goto err_hid_device;
 217
 218         hid_ishtp_trace(client_data,  "%s allocated hid %p\n", __func__, hid);
 219
 220         return 0;
 221
 222 err_hid_device:
 223         kfree(hid_data);
 224 err_hid_data:
 225         hid_destroy_device(hid);
 226         return rv;
 227 }
 228
 229 /**
 230  * ishtp_hid_probe() - Remove registered hid device
 231  * @client_data:        client data pointer
 232  *
 233  * This function is used to destroy allocatd HID device.
 234  */
 235 void ishtp_hid_remove(struct ishtp_cl_data *client_data)
 236 {
 237         int i;
 238
 239         for (i = 0; i < client_data->num_hid_devices; ++i) {
 240                 if (client_data->hid_sensor_hubs[i]) {
 241                         kfree(client_data->hid_sensor_hubs[i]->driver_data);
 242                         hid_destroy_device(client_data->hid_sensor_hubs[i]);
 243                         client_data->hid_sensor_hubs[i] = NULL;
 244                 }
 245         }
 246 }