kernel/drivers/hid/hid-sensor-hub.c

   1 /*
   2  * HID Sensors Driver
   3  * Copyright (c) 2012, Intel Corporation.
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms and conditions of the GNU General Public License,
   7  * version 2, as published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  12  * more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along with
  15  * this program; if not, write to the Free Software Foundation, Inc.,
  16  * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
  17  *
  18  */
  19 #include <linux/device.h>
  20 #include <linux/hid.h>
  21 #include <linux/module.h>
  22 #include <linux/slab.h>
  23 #include <linux/mfd/core.h>
  24 #include <linux/list.h>
  25 #include <linux/hid-sensor-ids.h>
  26 #include <linux/hid-sensor-hub.h>
  27 #include "hid-ids.h"
  28
  29 #define HID_SENSOR_HUB_ENUM_QUIRK       0x01
  30
  31 /**
  32  * struct sensor_hub_data - Hold a instance data for a HID hub device
  33  * @hsdev:              Stored hid instance for current hub device.
  34  * @mutex:              Mutex to serialize synchronous request.
  35  * @lock:               Spin lock to protect pending request structure.
  36  * @dyn_callback_list:  Holds callback function
  37  * @dyn_callback_lock:  spin lock to protect callback list
  38  * @hid_sensor_hub_client_devs: Stores all MFD cells for a hub instance.
  39  * @hid_sensor_client_cnt: Number of MFD cells, (no of sensors attached).
  40  * @ref_cnt:            Number of MFD clients have opened this device
  41  */
  42 struct sensor_hub_data {
  43         struct mutex mutex;
  44         spinlock_t lock;
  45         struct list_head dyn_callback_list;
  46         spinlock_t dyn_callback_lock;
  47         struct mfd_cell *hid_sensor_hub_client_devs;
  48         int hid_sensor_client_cnt;
  49         unsigned long quirks;
  50         int ref_cnt;
  51 };
  52
  53 /**
  54  * struct hid_sensor_hub_callbacks_list - Stores callback list
  55  * @list:               list head.
  56  * @usage_id:           usage id for a physical device.
  57  * @usage_callback:     Stores registered callback functions.
  58  * @priv:               Private data for a physical device.
  59  */
  60 struct hid_sensor_hub_callbacks_list {
  61         struct list_head list;
  62         u32 usage_id;
  63         struct hid_sensor_hub_device *hsdev;
  64         struct hid_sensor_hub_callbacks *usage_callback;
  65         void *priv;
  66 };
  67
  68 static struct hid_report *sensor_hub_report(int id, struct hid_device *hdev,
  69                                                 int dir)
  70 {
  71         struct hid_report *report;
  72
  73         list_for_each_entry(report, &hdev->report_enum[dir].report_list, list) {
  74                 if (report->id == id)
  75                         return report;
  76         }
  77         hid_warn(hdev, "No report with id 0x%x found\n", id);
  78
  79         return NULL;
  80 }
  81
  82 static int sensor_hub_get_physical_device_count(struct hid_device *hdev)
  83 {
  84         int i;
  85         int count = 0;
  86
  87         for (i = 0; i < hdev->maxcollection; ++i) {
  88                 struct hid_collection *collection = &hdev->collection[i];
  89                 if (collection->type == HID_COLLECTION_PHYSICAL ||
  90                     collection->type == HID_COLLECTION_APPLICATION)
  91                         ++count;
  92         }
  93
  94         return count;
  95 }
  96
  97 static void sensor_hub_fill_attr_info(
  98                 struct hid_sensor_hub_attribute_info *info,
  99                 s32 index, s32 report_id, struct hid_field *field)
 100 {
 101         info->index = index;
 102         info->report_id = report_id;
 103         info->units = field->unit;
 104         info->unit_expo = field->unit_exponent;
 105         info->size = (field->report_size * field->report_count)/8;
 106         info->logical_minimum = field->logical_minimum;
 107         info->logical_maximum = field->logical_maximum;
 108 }
 109
 110 static struct hid_sensor_hub_callbacks *sensor_hub_get_callback(
 111                                         struct hid_device *hdev,
 112                                         u32 usage_id,
 113                                         int collection_index,
 114                                         struct hid_sensor_hub_device **hsdev,
 115                                         void **priv)
 116 {
 117         struct hid_sensor_hub_callbacks_list *callback;
 118         struct sensor_hub_data *pdata = hid_get_drvdata(hdev);
 119         unsigned long flags;
 120
 121         spin_lock_irqsave(&pdata->dyn_callback_lock, flags);
 122         list_for_each_entry(callback, &pdata->dyn_callback_list, list)
 123                 if ((callback->usage_id == usage_id ||
 124                      callback->usage_id == HID_USAGE_SENSOR_COLLECTION) &&
 125                         (collection_index >=
 126                                 callback->hsdev->start_collection_index) &&
 127                         (collection_index <
 128                                 callback->hsdev->end_collection_index)) {
 129                         *priv = callback->priv;
 130                         *hsdev = callback->hsdev;
 131                         spin_unlock_irqrestore(&pdata->dyn_callback_lock,
 132                                                flags);
 133                         return callback->usage_callback;
 134                 }
 135         spin_unlock_irqrestore(&pdata->dyn_callback_lock, flags);
 136
 137         return NULL;
 138 }
 139
 140 int sensor_hub_register_callback(struct hid_sensor_hub_device *hsdev,
 141                         u32 usage_id,
 142                         struct hid_sensor_hub_callbacks *usage_callback)
 143 {
 144         struct hid_sensor_hub_callbacks_list *callback;
 145         struct sensor_hub_data *pdata = hid_get_drvdata(hsdev->hdev);
 146         unsigned long flags;
 147
 148         spin_lock_irqsave(&pdata->dyn_callback_lock, flags);
 149         list_for_each_entry(callback, &pdata->dyn_callback_list, list)
 150                 if (callback->usage_id == usage_id &&
 151                                                 callback->hsdev == hsdev) {
 152                         spin_unlock_irqrestore(&pdata->dyn_callback_lock, flags);
 153                         return -EINVAL;
 154                 }
 155         callback = kzalloc(sizeof(*callback), GFP_ATOMIC);
 156         if (!callback) {
 157                 spin_unlock_irqrestore(&pdata->dyn_callback_lock, flags);
 158                 return -ENOMEM;
 159         }
 160         callback->hsdev = hsdev;
 161         callback->usage_callback = usage_callback;
 162         callback->usage_id = usage_id;
 163         callback->priv = NULL;
 164         /*
 165          * If there is a handler registered for the collection type, then
 166          * it will handle all reports for sensors in this collection. If
 167          * there is also an individual sensor handler registration, then
 168          * we want to make sure that the reports are directed to collection
 169          * handler, as this may be a fusion sensor. So add collection handlers
 170          * to the beginning of the list, so that they are matched first.
 171          */
 172         if (usage_id == HID_USAGE_SENSOR_COLLECTION)
 173                 list_add(&callback->list, &pdata->dyn_callback_list);
 174         else
 175                 list_add_tail(&callback->list, &pdata->dyn_callback_list);
 176         spin_unlock_irqrestore(&pdata->dyn_callback_lock, flags);
 177
 178         return 0;
 179 }
 180 EXPORT_SYMBOL_GPL(sensor_hub_register_callback);
 181
 182 int sensor_hub_remove_callback(struct hid_sensor_hub_device *hsdev,
 183                                 u32 usage_id)
 184 {
 185         struct hid_sensor_hub_callbacks_list *callback;
 186         struct sensor_hub_data *pdata = hid_get_drvdata(hsdev->hdev);
 187         unsigned long flags;
 188
 189         spin_lock_irqsave(&pdata->dyn_callback_lock, flags);
 190         list_for_each_entry(callback, &pdata->dyn_callback_list, list)
 191                 if (callback->usage_id == usage_id &&
 192                                                 callback->hsdev == hsdev) {
 193                         list_del(&callback->list);
 194                         kfree(callback);
 195                         break;
 196                 }
 197         spin_unlock_irqrestore(&pdata->dyn_callback_lock, flags);
 198
 199         return 0;
 200 }
 201 EXPORT_SYMBOL_GPL(sensor_hub_remove_callback);
 202
 203 int sensor_hub_set_feature(struct hid_sensor_hub_device *hsdev, u32 report_id,
 204                            u32 field_index, int buffer_size, void *buffer)
 205 {
 206         struct hid_report *report;
 207         struct sensor_hub_data *data = hid_get_drvdata(hsdev->hdev);
 208         __s32 *buf32 = buffer;
 209         int i = 0;
 210         int remaining_bytes;
 211         __s32 value;
 212         int ret = 0;
 213
 214         mutex_lock(&data->mutex);
 215         report = sensor_hub_report(report_id, hsdev->hdev, HID_FEATURE_REPORT);
 216         if (!report || (field_index >= report->maxfield)) {
 217                 ret = -EINVAL;
 218                 goto done_proc;
 219         }
 220
 221         remaining_bytes = do_div(buffer_size, sizeof(__s32));
 222         if (buffer_size) {
 223                 for (i = 0; i < buffer_size; ++i) {
 224                         hid_set_field(report->field[field_index], i,
 225                                       (__force __s32)cpu_to_le32(*buf32));
 226                         ++buf32;
 227                 }
 228         }
 229         if (remaining_bytes) {
 230                 value = 0;
 231                 memcpy(&value, (u8 *)buf32, remaining_bytes);
 232                 hid_set_field(report->field[field_index], i,
 233                               (__force __s32)cpu_to_le32(value));
 234         }
 235         hid_hw_request(hsdev->hdev, report, HID_REQ_SET_REPORT);
 236         hid_hw_wait(hsdev->hdev);
 237
 238 done_proc:
 239         mutex_unlock(&data->mutex);
 240
 241         return ret;
 242 }
 243 EXPORT_SYMBOL_GPL(sensor_hub_set_feature);
 244
 245 int sensor_hub_get_feature(struct hid_sensor_hub_device *hsdev, u32 report_id,
 246                            u32 field_index, int buffer_size, void *buffer)
 247 {
 248         struct hid_report *report;
 249         struct sensor_hub_data *data = hid_get_drvdata(hsdev->hdev);
 250         int report_size;
 251         int ret = 0;
 252
 253         mutex_lock(&data->mutex);
 254         report = sensor_hub_report(report_id, hsdev->hdev, HID_FEATURE_REPORT);
 255         if (!report || (field_index >= report->maxfield) ||
 256             report->field[field_index]->report_count < 1) {
 257                 ret = -EINVAL;
 258                 goto done_proc;
 259         }
 260         hid_hw_request(hsdev->hdev, report, HID_REQ_GET_REPORT);
 261         hid_hw_wait(hsdev->hdev);
 262
 263         /* calculate number of bytes required to read this field */
 264         report_size = DIV_ROUND_UP(report->field[field_index]->report_size,
 265                                    8) *
 266                                    report->field[field_index]->report_count;
 267         if (!report_size) {
 268                 ret = -EINVAL;
 269                 goto done_proc;
 270         }
 271         ret = min(report_size, buffer_size);
 272         memcpy(buffer, report->field[field_index]->value, ret);
 273
 274 done_proc:
 275         mutex_unlock(&data->mutex);
 276
 277         return ret;
 278 }
 279 EXPORT_SYMBOL_GPL(sensor_hub_get_feature);
 280
 281
 282 int sensor_hub_input_attr_get_raw_value(struct hid_sensor_hub_device *hsdev,
 283                                         u32 usage_id,
 284                                         u32 attr_usage_id, u32 report_id,
 285                                         enum sensor_hub_read_flags flag)
 286 {
 287         struct sensor_hub_data *data = hid_get_drvdata(hsdev->hdev);
 288         unsigned long flags;
 289         struct hid_report *report;
 290         int ret_val = 0;
 291
 292         report = sensor_hub_report(report_id, hsdev->hdev,
 293                                    HID_INPUT_REPORT);
 294         if (!report)
 295                 return -EINVAL;
 296
 297         mutex_lock(hsdev->mutex_ptr);
 298         if (flag == SENSOR_HUB_SYNC) {
 299                 memset(&hsdev->pending, 0, sizeof(hsdev->pending));
 300                 init_completion(&hsdev->pending.ready);
 301                 hsdev->pending.usage_id = usage_id;
 302                 hsdev->pending.attr_usage_id = attr_usage_id;
 303                 hsdev->pending.raw_size = 0;
 304
 305                 spin_lock_irqsave(&data->lock, flags);
 306                 hsdev->pending.status = true;
 307                 spin_unlock_irqrestore(&data->lock, flags);
 308         }
 309         mutex_lock(&data->mutex);
 310         hid_hw_request(hsdev->hdev, report, HID_REQ_GET_REPORT);
 311         mutex_unlock(&data->mutex);
 312         if (flag == SENSOR_HUB_SYNC) {
 313                 wait_for_completion_interruptible_timeout(
 314                                                 &hsdev->pending.ready, HZ*5);
 315                 switch (hsdev->pending.raw_size) {
 316                 case 1:
 317                         ret_val = *(u8 *)hsdev->pending.raw_data;
 318                         break;
 319                 case 2:
 320                         ret_val = *(u16 *)hsdev->pending.raw_data;
 321                         break;
 322                 case 4:
 323                         ret_val = *(u32 *)hsdev->pending.raw_data;
 324                         break;
 325                 default:
 326                         ret_val = 0;
 327                 }
 328                 kfree(hsdev->pending.raw_data);
 329                 hsdev->pending.status = false;
 330         }
 331         mutex_unlock(hsdev->mutex_ptr);
 332
 333         return ret_val;
 334 }
 335 EXPORT_SYMBOL_GPL(sensor_hub_input_attr_get_raw_value);
 336
 337 int hid_sensor_get_usage_index(struct hid_sensor_hub_device *hsdev,
 338                                 u32 report_id, int field_index, u32 usage_id)
 339 {
 340         struct hid_report *report;
 341         struct hid_field *field;
 342         int i;
 343
 344         report = sensor_hub_report(report_id, hsdev->hdev, HID_FEATURE_REPORT);
 345         if (!report || (field_index >= report->maxfield))
 346                 goto done_proc;
 347
 348         field = report->field[field_index];
 349         for (i = 0; i < field->maxusage; ++i) {
 350                 if (field->usage[i].hid == usage_id)
 351                         return field->usage[i].usage_index;
 352         }
 353
 354 done_proc:
 355         return -EINVAL;
 356 }
 357 EXPORT_SYMBOL_GPL(hid_sensor_get_usage_index);
 358
 359 int sensor_hub_input_get_attribute_info(struct hid_sensor_hub_device *hsdev,
 360                                 u8 type,
 361                                 u32 usage_id,
 362                                 u32 attr_usage_id,
 363                                 struct hid_sensor_hub_attribute_info *info)
 364 {
 365         int ret = -1;
 366         int i;
 367         struct hid_report *report;
 368         struct hid_field *field;
 369         struct hid_report_enum *report_enum;
 370         struct hid_device *hdev = hsdev->hdev;
 371
 372         /* Initialize with defaults */
 373         info->usage_id = usage_id;
 374         info->attrib_id = attr_usage_id;
 375         info->report_id = -1;
 376         info->index = -1;
 377         info->units = -1;
 378         info->unit_expo = -1;
 379
 380         report_enum = &hdev->report_enum[type];
 381         list_for_each_entry(report, &report_enum->report_list, list) {
 382                 for (i = 0; i < report->maxfield; ++i) {
 383                         field = report->field[i];
 384                         if (field->maxusage) {
 385                                 if (field->physical == usage_id &&
 386                                         (field->logical == attr_usage_id ||
 387                                         field->usage[0].hid ==
 388                                                         attr_usage_id) &&
 389                                         (field->usage[0].collection_index >=
 390                                         hsdev->start_collection_index) &&
 391                                         (field->usage[0].collection_index <
 392                                         hsdev->end_collection_index)) {
 393
 394                                         sensor_hub_fill_attr_info(info, i,
 395                                                                 report->id,
 396                                                                 field);
 397                                         ret = 0;
 398                                         break;
 399                                 }
 400                         }
 401                 }
 402
 403         }
 404
 405         return ret;
 406 }
 407 EXPORT_SYMBOL_GPL(sensor_hub_input_get_attribute_info);
 408
 409 #ifdef CONFIG_PM
 410 static int sensor_hub_suspend(struct hid_device *hdev, pm_message_t message)
 411 {
 412         struct sensor_hub_data *pdata = hid_get_drvdata(hdev);
 413         struct hid_sensor_hub_callbacks_list *callback;
 414         unsigned long flags;
 415
 416         hid_dbg(hdev, " sensor_hub_suspend\n");
 417         spin_lock_irqsave(&pdata->dyn_callback_lock, flags);
 418         list_for_each_entry(callback, &pdata->dyn_callback_list, list) {
 419                 if (callback->usage_callback->suspend)
 420                         callback->usage_callback->suspend(
 421                                         callback->hsdev, callback->priv);
 422         }
 423         spin_unlock_irqrestore(&pdata->dyn_callback_lock, flags);
 424
 425         return 0;
 426 }
 427
 428 static int sensor_hub_resume(struct hid_device *hdev)
 429 {
 430         struct sensor_hub_data *pdata = hid_get_drvdata(hdev);
 431         struct hid_sensor_hub_callbacks_list *callback;
 432         unsigned long flags;
 433
 434         hid_dbg(hdev, " sensor_hub_resume\n");
 435         spin_lock_irqsave(&pdata->dyn_callback_lock, flags);
 436         list_for_each_entry(callback, &pdata->dyn_callback_list, list) {
 437                 if (callback->usage_callback->resume)
 438                         callback->usage_callback->resume(
 439                                         callback->hsdev, callback->priv);
 440         }
 441         spin_unlock_irqrestore(&pdata->dyn_callback_lock, flags);
 442
 443         return 0;
 444 }
 445
 446 static int sensor_hub_reset_resume(struct hid_device *hdev)
 447 {
 448         return 0;
 449 }
 450 #endif
 451
 452 /*
 453  * Handle raw report as sent by device
 454  */
 455 static int sensor_hub_raw_event(struct hid_device *hdev,
 456                 struct hid_report *report, u8 *raw_data, int size)
 457 {
 458         int i;
 459         u8 *ptr;
 460         int sz;
 461         struct sensor_hub_data *pdata = hid_get_drvdata(hdev);
 462         unsigned long flags;
 463         struct hid_sensor_hub_callbacks *callback = NULL;
 464         struct hid_collection *collection = NULL;
 465         void *priv = NULL;
 466         struct hid_sensor_hub_device *hsdev = NULL;
 467
 468         hid_dbg(hdev, "sensor_hub_raw_event report id:0x%x size:%d type:%d\n",
 469                          report->id, size, report->type);
 470         hid_dbg(hdev, "maxfield:%d\n", report->maxfield);
 471         if (report->type != HID_INPUT_REPORT)
 472                 return 1;
 473
 474         ptr = raw_data;
 475         ptr++; /* Skip report id */
 476
 477         spin_lock_irqsave(&pdata->lock, flags);
 478
 479         for (i = 0; i < report->maxfield; ++i) {
 480                 hid_dbg(hdev, "%d collection_index:%x hid:%x sz:%x\n",
 481                                 i, report->field[i]->usage->collection_index,
 482                                 report->field[i]->usage->hid,
 483                                 (report->field[i]->report_size *
 484                                         report->field[i]->report_count)/8);
 485                 sz = (report->field[i]->report_size *
 486                                         report->field[i]->report_count)/8;
 487                 collection = &hdev->collection[
 488                                 report->field[i]->usage->collection_index];
 489                 hid_dbg(hdev, "collection->usage %x\n",
 490                                         collection->usage);
 491
 492                 callback = sensor_hub_get_callback(hdev,
 493                                 report->field[i]->physical,
 494                                 report->field[i]->usage[0].collection_index,
 495                                 &hsdev, &priv);
 496                 if (!callback) {
 497                         ptr += sz;
 498                         continue;
 499                 }
 500                 if (hsdev->pending.status && (hsdev->pending.attr_usage_id ==
 501                                               report->field[i]->usage->hid ||
 502                                               hsdev->pending.attr_usage_id ==
 503                                               report->field[i]->logical)) {
 504                         hid_dbg(hdev, "data was pending ...\n");
 505                         hsdev->pending.raw_data = kmemdup(ptr, sz, GFP_ATOMIC);
 506                         if (hsdev->pending.raw_data)
 507                                 hsdev->pending.raw_size = sz;
 508                         else
 509                                 hsdev->pending.raw_size = 0;
 510                         complete(&hsdev->pending.ready);
 511                 }
 512                 if (callback->capture_sample) {
 513                         if (report->field[i]->logical)
 514                                 callback->capture_sample(hsdev,
 515                                         report->field[i]->logical, sz, ptr,
 516                                         callback->pdev);
 517                         else
 518                                 callback->capture_sample(hsdev,
 519                                         report->field[i]->usage->hid, sz, ptr,
 520                                         callback->pdev);
 521                 }
 522                 ptr += sz;
 523         }
 524         if (callback && collection && callback->send_event)
 525                 callback->send_event(hsdev, collection->usage,
 526                                 callback->pdev);
 527         spin_unlock_irqrestore(&pdata->lock, flags);
 528
 529         return 1;
 530 }
 531
 532 int sensor_hub_device_open(struct hid_sensor_hub_device *hsdev)
 533 {
 534         int ret = 0;
 535         struct sensor_hub_data *data =  hid_get_drvdata(hsdev->hdev);
 536
 537         mutex_lock(&data->mutex);
 538         if (!data->ref_cnt) {
 539                 ret = hid_hw_open(hsdev->hdev);
 540                 if (ret) {
 541                         hid_err(hsdev->hdev, "failed to open hid device\n");
 542                         mutex_unlock(&data->mutex);
 543                         return ret;
 544                 }
 545         }
 546         data->ref_cnt++;
 547         mutex_unlock(&data->mutex);
 548
 549         return ret;
 550 }
 551 EXPORT_SYMBOL_GPL(sensor_hub_device_open);
 552
 553 void sensor_hub_device_close(struct hid_sensor_hub_device *hsdev)
 554 {
 555         struct sensor_hub_data *data =  hid_get_drvdata(hsdev->hdev);
 556
 557         mutex_lock(&data->mutex);
 558         data->ref_cnt--;
 559         if (!data->ref_cnt)
 560                 hid_hw_close(hsdev->hdev);
 561         mutex_unlock(&data->mutex);
 562 }
 563 EXPORT_SYMBOL_GPL(sensor_hub_device_close);
 564
 565 static __u8 *sensor_hub_report_fixup(struct hid_device *hdev, __u8 *rdesc,
 566                 unsigned int *rsize)
 567 {
 568         int index;
 569         struct sensor_hub_data *sd =  hid_get_drvdata(hdev);
 570         unsigned char report_block[] = {
 571                                 0x0a,  0x16, 0x03, 0x15, 0x00, 0x25, 0x05};
 572         unsigned char power_block[] = {
 573                                 0x0a,  0x19, 0x03, 0x15, 0x00, 0x25, 0x05};
 574
 575         if (!(sd->quirks & HID_SENSOR_HUB_ENUM_QUIRK)) {
 576                 hid_dbg(hdev, "No Enum quirks\n");
 577                 return rdesc;
 578         }
 579
 580         /* Looks for power and report state usage id and force to 1 */
 581         for (index = 0; index < *rsize; ++index) {
 582                 if (((*rsize - index) > sizeof(report_block)) &&
 583                         !memcmp(&rdesc[index], report_block,
 584                                                 sizeof(report_block))) {
 585                         rdesc[index + 4] = 0x01;
 586                         index += sizeof(report_block);
 587                 }
 588                 if (((*rsize - index) > sizeof(power_block)) &&
 589                         !memcmp(&rdesc[index], power_block,
 590                                                 sizeof(power_block))) {
 591                         rdesc[index + 4] = 0x01;
 592                         index += sizeof(power_block);
 593                 }
 594         }
 595
 596         return rdesc;
 597 }
 598
 599 static int sensor_hub_probe(struct hid_device *hdev,
 600                                 const struct hid_device_id *id)
 601 {
 602         int ret;
 603         struct sensor_hub_data *sd;
 604         int i;
 605         char *name;
 606         int dev_cnt;
 607         struct hid_sensor_hub_device *hsdev;
 608         struct hid_sensor_hub_device *last_hsdev = NULL;
 609         struct hid_sensor_hub_device *collection_hsdev = NULL;
 610
 611         sd = devm_kzalloc(&hdev->dev, sizeof(*sd), GFP_KERNEL);
 612         if (!sd) {
 613                 hid_err(hdev, "cannot allocate Sensor data\n");
 614                 return -ENOMEM;
 615         }
 616
 617         hid_set_drvdata(hdev, sd);
 618         sd->quirks = id->driver_data;
 619
 620         spin_lock_init(&sd->lock);
 621         spin_lock_init(&sd->dyn_callback_lock);
 622         mutex_init(&sd->mutex);
 623         ret = hid_parse(hdev);
 624         if (ret) {
 625                 hid_err(hdev, "parse failed\n");
 626                 return ret;
 627         }
 628         INIT_LIST_HEAD(&hdev->inputs);
 629
 630         ret = hid_hw_start(hdev, 0);
 631         if (ret) {
 632                 hid_err(hdev, "hw start failed\n");
 633                 return ret;
 634         }
 635         INIT_LIST_HEAD(&sd->dyn_callback_list);
 636         sd->hid_sensor_client_cnt = 0;
 637
 638         dev_cnt = sensor_hub_get_physical_device_count(hdev);
 639         if (dev_cnt > HID_MAX_PHY_DEVICES) {
 640                 hid_err(hdev, "Invalid Physical device count\n");
 641                 ret = -EINVAL;
 642                 goto err_stop_hw;
 643         }
 644         sd->hid_sensor_hub_client_devs = devm_kzalloc(&hdev->dev, dev_cnt *
 645                                                       sizeof(struct mfd_cell),
 646                                                       GFP_KERNEL);
 647         if (sd->hid_sensor_hub_client_devs == NULL) {
 648                 hid_err(hdev, "Failed to allocate memory for mfd cells\n");
 649                         ret = -ENOMEM;
 650                         goto err_stop_hw;
 651         }
 652
 653         for (i = 0; i < hdev->maxcollection; ++i) {
 654                 struct hid_collection *collection = &hdev->collection[i];
 655
 656                 if (collection->type == HID_COLLECTION_PHYSICAL ||
 657                     collection->type == HID_COLLECTION_APPLICATION) {
 658
 659                         hsdev = devm_kzalloc(&hdev->dev, sizeof(*hsdev),
 660                                              GFP_KERNEL);
 661                         if (!hsdev) {
 662                                 hid_err(hdev, "cannot allocate hid_sensor_hub_device\n");
 663                                 ret = -ENOMEM;
 664                                 goto err_stop_hw;
 665                         }
 666                         hsdev->hdev = hdev;
 667                         hsdev->vendor_id = hdev->vendor;
 668                         hsdev->product_id = hdev->product;
 669                         hsdev->usage = collection->usage;
 670                         hsdev->mutex_ptr = devm_kzalloc(&hdev->dev,
 671                                                         sizeof(struct mutex),
 672                                                         GFP_KERNEL);
 673                         if (!hsdev->mutex_ptr) {
 674                                 ret = -ENOMEM;
 675                                 goto err_stop_hw;
 676                         }
 677                         mutex_init(hsdev->mutex_ptr);
 678                         hsdev->start_collection_index = i;
 679                         if (last_hsdev)
 680                                 last_hsdev->end_collection_index = i;
 681                         last_hsdev = hsdev;
 682                         name = devm_kasprintf(&hdev->dev, GFP_KERNEL,
 683                                               "HID-SENSOR-%x",
 684                                               collection->usage);
 685                         if (name == NULL) {
 686                                 hid_err(hdev, "Failed MFD device name\n");
 687                                         ret = -ENOMEM;
 688                                         goto err_stop_hw;
 689                         }
 690                         sd->hid_sensor_hub_client_devs[
 691                                 sd->hid_sensor_client_cnt].name = name;
 692                         sd->hid_sensor_hub_client_devs[
 693                                 sd->hid_sensor_client_cnt].platform_data =
 694                                                         hsdev;
 695                         sd->hid_sensor_hub_client_devs[
 696                                 sd->hid_sensor_client_cnt].pdata_size =
 697                                                         sizeof(*hsdev);
 698                         hid_dbg(hdev, "Adding %s:%d\n", name,
 699                                         hsdev->start_collection_index);
 700                         sd->hid_sensor_client_cnt++;
 701                         if (collection_hsdev)
 702                                 collection_hsdev->end_collection_index = i;
 703                         if (collection->type == HID_COLLECTION_APPLICATION &&
 704                             collection->usage == HID_USAGE_SENSOR_COLLECTION)
 705                                 collection_hsdev = hsdev;
 706                 }
 707         }
 708         if (last_hsdev)
 709                 last_hsdev->end_collection_index = i;
 710         if (collection_hsdev)
 711                 collection_hsdev->end_collection_index = i;
 712
 713         ret = mfd_add_hotplug_devices(&hdev->dev,
 714                         sd->hid_sensor_hub_client_devs,
 715                         sd->hid_sensor_client_cnt);
 716         if (ret < 0)
 717                 goto err_stop_hw;
 718
 719         return ret;
 720
 721 err_stop_hw:
 722         hid_hw_stop(hdev);
 723
 724         return ret;
 725 }
 726
 727 static void sensor_hub_remove(struct hid_device *hdev)
 728 {
 729         struct sensor_hub_data *data = hid_get_drvdata(hdev);
 730         unsigned long flags;
 731         int i;
 732
 733         hid_dbg(hdev, " hardware removed\n");
 734         hid_hw_close(hdev);
 735         hid_hw_stop(hdev);
 736         spin_lock_irqsave(&data->lock, flags);
 737         for (i = 0; i < data->hid_sensor_client_cnt; ++i) {
 738                 struct hid_sensor_hub_device *hsdev =
 739                         data->hid_sensor_hub_client_devs[i].platform_data;
 740                 if (hsdev->pending.status)
 741                         complete(&hsdev->pending.ready);
 742         }
 743         spin_unlock_irqrestore(&data->lock, flags);
 744         mfd_remove_devices(&hdev->dev);
 745         hid_set_drvdata(hdev, NULL);
 746         mutex_destroy(&data->mutex);
 747 }
 748
 749 static const struct hid_device_id sensor_hub_devices[] = {
 750         { HID_DEVICE(HID_BUS_ANY, HID_GROUP_SENSOR_HUB, USB_VENDOR_ID_INTEL_0,
 751                         USB_DEVICE_ID_INTEL_HID_SENSOR_0),
 752                         .driver_data = HID_SENSOR_HUB_ENUM_QUIRK},
 753         { HID_DEVICE(HID_BUS_ANY, HID_GROUP_SENSOR_HUB, USB_VENDOR_ID_INTEL_1,
 754                         USB_DEVICE_ID_INTEL_HID_SENSOR_0),
 755                         .driver_data = HID_SENSOR_HUB_ENUM_QUIRK},
 756         { HID_DEVICE(HID_BUS_ANY, HID_GROUP_SENSOR_HUB, USB_VENDOR_ID_INTEL_1,
 757                         USB_DEVICE_ID_INTEL_HID_SENSOR_1),
 758                         .driver_data = HID_SENSOR_HUB_ENUM_QUIRK},
 759         { HID_DEVICE(HID_BUS_ANY, HID_GROUP_SENSOR_HUB, USB_VENDOR_ID_MICROSOFT,
 760                         USB_DEVICE_ID_MS_SURFACE_PRO_2),
 761                         .driver_data = HID_SENSOR_HUB_ENUM_QUIRK},
 762         { HID_DEVICE(HID_BUS_ANY, HID_GROUP_SENSOR_HUB, USB_VENDOR_ID_MICROSOFT,
 763                         USB_DEVICE_ID_MS_TOUCH_COVER_2),
 764                         .driver_data = HID_SENSOR_HUB_ENUM_QUIRK},
 765         { HID_DEVICE(HID_BUS_ANY, HID_GROUP_SENSOR_HUB, USB_VENDOR_ID_MICROSOFT,
 766                         USB_DEVICE_ID_MS_TYPE_COVER_2),
 767                         .driver_data = HID_SENSOR_HUB_ENUM_QUIRK},
 768         { HID_DEVICE(HID_BUS_ANY, HID_GROUP_SENSOR_HUB, USB_VENDOR_ID_STM_0,
 769                         USB_DEVICE_ID_STM_HID_SENSOR),
 770                         .driver_data = HID_SENSOR_HUB_ENUM_QUIRK},
 771         { HID_DEVICE(HID_BUS_ANY, HID_GROUP_SENSOR_HUB, USB_VENDOR_ID_STM_0,
 772                         USB_DEVICE_ID_STM_HID_SENSOR_1),
 773                         .driver_data = HID_SENSOR_HUB_ENUM_QUIRK},
 774         { HID_DEVICE(HID_BUS_ANY, HID_GROUP_SENSOR_HUB, USB_VENDOR_ID_TEXAS_INSTRUMENTS,
 775                         USB_DEVICE_ID_TEXAS_INSTRUMENTS_LENOVO_YOGA),
 776                         .driver_data = HID_SENSOR_HUB_ENUM_QUIRK},
 777         { HID_DEVICE(HID_BUS_ANY, HID_GROUP_SENSOR_HUB, HID_ANY_ID,
 778                      HID_ANY_ID) },
 779         { }
 780 };
 781 MODULE_DEVICE_TABLE(hid, sensor_hub_devices);
 782
 783 static struct hid_driver sensor_hub_driver = {
 784         .name = "hid-sensor-hub",
 785         .id_table = sensor_hub_devices,
 786         .probe = sensor_hub_probe,
 787         .remove = sensor_hub_remove,
 788         .raw_event = sensor_hub_raw_event,
 789         .report_fixup = sensor_hub_report_fixup,
 790 #ifdef CONFIG_PM
 791         .suspend = sensor_hub_suspend,
 792         .resume = sensor_hub_resume,
 793         .reset_resume = sensor_hub_reset_resume,
 794 #endif
 795 };
 796 module_hid_driver(sensor_hub_driver);
 797
 798 MODULE_DESCRIPTION("HID Sensor Hub driver");
 799 MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@intel.com>");
 800 MODULE_LICENSE("GPL");