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
 120         spin_lock(&pdata->dyn_callback_lock);
 121         list_for_each_entry(callback, &pdata->dyn_callback_list, list)
 122                 if ((callback->usage_id == usage_id ||
 123                      callback->usage_id == HID_USAGE_SENSOR_COLLECTION) &&
 124                         (collection_index >=
 125                                 callback->hsdev->start_collection_index) &&
 126                         (collection_index <
 127                                 callback->hsdev->end_collection_index)) {
 128                         *priv = callback->priv;
 129                         *hsdev = callback->hsdev;
 130                         spin_unlock(&pdata->dyn_callback_lock);
 131                         return callback->usage_callback;
 132                 }
 133         spin_unlock(&pdata->dyn_callback_lock);
 134
 135         return NULL;
 136 }
 137
 138 int sensor_hub_register_callback(struct hid_sensor_hub_device *hsdev,
 139                         u32 usage_id,
 140                         struct hid_sensor_hub_callbacks *usage_callback)
 141 {
 142         struct hid_sensor_hub_callbacks_list *callback;
 143         struct sensor_hub_data *pdata = hid_get_drvdata(hsdev->hdev);
 144         unsigned long flags;
 145
 146         spin_lock_irqsave(&pdata->dyn_callback_lock, flags);
 147         list_for_each_entry(callback, &pdata->dyn_callback_list, list)
 148                 if (callback->usage_id == usage_id &&
 149                                                 callback->hsdev == hsdev) {
 150                         spin_unlock_irqrestore(&pdata->dyn_callback_lock, flags);
 151                         return -EINVAL;
 152                 }
 153         callback = kzalloc(sizeof(*callback), GFP_ATOMIC);
 154         if (!callback) {
 155                 spin_unlock_irqrestore(&pdata->dyn_callback_lock, flags);
 156                 return -ENOMEM;
 157         }
 158         callback->hsdev = hsdev;
 159         callback->usage_callback = usage_callback;
 160         callback->usage_id = usage_id;
 161         callback->priv = NULL;
 162         /*
 163          * If there is a handler registered for the collection type, then
 164          * it will handle all reports for sensors in this collection. If
 165          * there is also an individual sensor handler registration, then
 166          * we want to make sure that the reports are directed to collection
 167          * handler, as this may be a fusion sensor. So add collection handlers
 168          * to the beginning of the list, so that they are matched first.
 169          */
 170         if (usage_id == HID_USAGE_SENSOR_COLLECTION)
 171                 list_add(&callback->list, &pdata->dyn_callback_list);
 172         else
 173                 list_add_tail(&callback->list, &pdata->dyn_callback_list);
 174         spin_unlock_irqrestore(&pdata->dyn_callback_lock, flags);
 175
 176         return 0;
 177 }
 178 EXPORT_SYMBOL_GPL(sensor_hub_register_callback);
 179
 180 int sensor_hub_remove_callback(struct hid_sensor_hub_device *hsdev,
 181                                 u32 usage_id)
 182 {
 183         struct hid_sensor_hub_callbacks_list *callback;
 184         struct sensor_hub_data *pdata = hid_get_drvdata(hsdev->hdev);
 185         unsigned long flags;
 186
 187         spin_lock_irqsave(&pdata->dyn_callback_lock, flags);
 188         list_for_each_entry(callback, &pdata->dyn_callback_list, list)
 189                 if (callback->usage_id == usage_id &&
 190                                                 callback->hsdev == hsdev) {
 191                         list_del(&callback->list);
 192                         kfree(callback);
 193                         break;
 194                 }
 195         spin_unlock_irqrestore(&pdata->dyn_callback_lock, flags);
 196
 197         return 0;
 198 }
 199 EXPORT_SYMBOL_GPL(sensor_hub_remove_callback);
 200
 201 int sensor_hub_set_feature(struct hid_sensor_hub_device *hsdev, u32 report_id,
 202                                 u32 field_index, s32 value)
 203 {
 204         struct hid_report *report;
 205         struct sensor_hub_data *data = hid_get_drvdata(hsdev->hdev);
 206         int ret = 0;
 207
 208         mutex_lock(&data->mutex);
 209         report = sensor_hub_report(report_id, hsdev->hdev, HID_FEATURE_REPORT);
 210         if (!report || (field_index >= report->maxfield)) {
 211                 ret = -EINVAL;
 212                 goto done_proc;
 213         }
 214         hid_set_field(report->field[field_index], 0, value);
 215         hid_hw_request(hsdev->hdev, report, HID_REQ_SET_REPORT);
 216         hid_hw_wait(hsdev->hdev);
 217
 218 done_proc:
 219         mutex_unlock(&data->mutex);
 220
 221         return ret;
 222 }
 223 EXPORT_SYMBOL_GPL(sensor_hub_set_feature);
 224
 225 int sensor_hub_get_feature(struct hid_sensor_hub_device *hsdev, u32 report_id,
 226                                 u32 field_index, s32 *value)
 227 {
 228         struct hid_report *report;
 229         struct sensor_hub_data *data = hid_get_drvdata(hsdev->hdev);
 230         int ret = 0;
 231
 232         mutex_lock(&data->mutex);
 233         report = sensor_hub_report(report_id, hsdev->hdev, HID_FEATURE_REPORT);
 234         if (!report || (field_index >= report->maxfield) ||
 235             report->field[field_index]->report_count < 1) {
 236                 ret = -EINVAL;
 237                 goto done_proc;
 238         }
 239         hid_hw_request(hsdev->hdev, report, HID_REQ_GET_REPORT);
 240         hid_hw_wait(hsdev->hdev);
 241         *value = report->field[field_index]->value[0];
 242
 243 done_proc:
 244         mutex_unlock(&data->mutex);
 245
 246         return ret;
 247 }
 248 EXPORT_SYMBOL_GPL(sensor_hub_get_feature);
 249
 250
 251 int sensor_hub_input_attr_get_raw_value(struct hid_sensor_hub_device *hsdev,
 252                                         u32 usage_id,
 253                                         u32 attr_usage_id, u32 report_id,
 254                                         enum sensor_hub_read_flags flag)
 255 {
 256         struct sensor_hub_data *data = hid_get_drvdata(hsdev->hdev);
 257         unsigned long flags;
 258         struct hid_report *report;
 259         int ret_val = 0;
 260
 261         report = sensor_hub_report(report_id, hsdev->hdev,
 262                                    HID_INPUT_REPORT);
 263         if (!report)
 264                 return -EINVAL;
 265
 266         mutex_lock(&hsdev->mutex);
 267         if (flag == SENSOR_HUB_SYNC) {
 268                 memset(&hsdev->pending, 0, sizeof(hsdev->pending));
 269                 init_completion(&hsdev->pending.ready);
 270                 hsdev->pending.usage_id = usage_id;
 271                 hsdev->pending.attr_usage_id = attr_usage_id;
 272                 hsdev->pending.raw_size = 0;
 273
 274                 spin_lock_irqsave(&data->lock, flags);
 275                 hsdev->pending.status = true;
 276                 spin_unlock_irqrestore(&data->lock, flags);
 277         }
 278         mutex_lock(&data->mutex);
 279         hid_hw_request(hsdev->hdev, report, HID_REQ_GET_REPORT);
 280         mutex_unlock(&data->mutex);
 281         if (flag == SENSOR_HUB_SYNC) {
 282                 wait_for_completion_interruptible_timeout(
 283                                                 &hsdev->pending.ready, HZ*5);
 284                 switch (hsdev->pending.raw_size) {
 285                 case 1:
 286                         ret_val = *(u8 *)hsdev->pending.raw_data;
 287                         break;
 288                 case 2:
 289                         ret_val = *(u16 *)hsdev->pending.raw_data;
 290                         break;
 291                 case 4:
 292                         ret_val = *(u32 *)hsdev->pending.raw_data;
 293                         break;
 294                 default:
 295                         ret_val = 0;
 296                 }
 297                 kfree(hsdev->pending.raw_data);
 298                 hsdev->pending.status = false;
 299         }
 300         mutex_unlock(&hsdev->mutex);
 301
 302         return ret_val;
 303 }
 304 EXPORT_SYMBOL_GPL(sensor_hub_input_attr_get_raw_value);
 305
 306 int hid_sensor_get_usage_index(struct hid_sensor_hub_device *hsdev,
 307                                 u32 report_id, int field_index, u32 usage_id)
 308 {
 309         struct hid_report *report;
 310         struct hid_field *field;
 311         int i;
 312
 313         report = sensor_hub_report(report_id, hsdev->hdev, HID_FEATURE_REPORT);
 314         if (!report || (field_index >= report->maxfield))
 315                 goto done_proc;
 316
 317         field = report->field[field_index];
 318         for (i = 0; i < field->maxusage; ++i) {
 319                 if (field->usage[i].hid == usage_id)
 320                         return field->usage[i].usage_index;
 321         }
 322
 323 done_proc:
 324         return -EINVAL;
 325 }
 326 EXPORT_SYMBOL_GPL(hid_sensor_get_usage_index);
 327
 328 int sensor_hub_input_get_attribute_info(struct hid_sensor_hub_device *hsdev,
 329                                 u8 type,
 330                                 u32 usage_id,
 331                                 u32 attr_usage_id,
 332                                 struct hid_sensor_hub_attribute_info *info)
 333 {
 334         int ret = -1;
 335         int i;
 336         struct hid_report *report;
 337         struct hid_field *field;
 338         struct hid_report_enum *report_enum;
 339         struct hid_device *hdev = hsdev->hdev;
 340
 341         /* Initialize with defaults */
 342         info->usage_id = usage_id;
 343         info->attrib_id = attr_usage_id;
 344         info->report_id = -1;
 345         info->index = -1;
 346         info->units = -1;
 347         info->unit_expo = -1;
 348
 349         report_enum = &hdev->report_enum[type];
 350         list_for_each_entry(report, &report_enum->report_list, list) {
 351                 for (i = 0; i < report->maxfield; ++i) {
 352                         field = report->field[i];
 353                         if (field->maxusage) {
 354                                 if (field->physical == usage_id &&
 355                                         (field->logical == attr_usage_id ||
 356                                         field->usage[0].hid ==
 357                                                         attr_usage_id) &&
 358                                         (field->usage[0].collection_index >=
 359                                         hsdev->start_collection_index) &&
 360                                         (field->usage[0].collection_index <
 361                                         hsdev->end_collection_index)) {
 362
 363                                         sensor_hub_fill_attr_info(info, i,
 364                                                                 report->id,
 365                                                                 field);
 366                                         ret = 0;
 367                                         break;
 368                                 }
 369                         }
 370                 }
 371
 372         }
 373
 374         return ret;
 375 }
 376 EXPORT_SYMBOL_GPL(sensor_hub_input_get_attribute_info);
 377
 378 #ifdef CONFIG_PM
 379 static int sensor_hub_suspend(struct hid_device *hdev, pm_message_t message)
 380 {
 381         struct sensor_hub_data *pdata = hid_get_drvdata(hdev);
 382         struct hid_sensor_hub_callbacks_list *callback;
 383         unsigned long flags;
 384
 385         hid_dbg(hdev, " sensor_hub_suspend\n");
 386         spin_lock_irqsave(&pdata->dyn_callback_lock, flags);
 387         list_for_each_entry(callback, &pdata->dyn_callback_list, list) {
 388                 if (callback->usage_callback->suspend)
 389                         callback->usage_callback->suspend(
 390                                         callback->hsdev, callback->priv);
 391         }
 392         spin_unlock_irqrestore(&pdata->dyn_callback_lock, flags);
 393
 394         return 0;
 395 }
 396
 397 static int sensor_hub_resume(struct hid_device *hdev)
 398 {
 399         struct sensor_hub_data *pdata = hid_get_drvdata(hdev);
 400         struct hid_sensor_hub_callbacks_list *callback;
 401         unsigned long flags;
 402
 403         hid_dbg(hdev, " sensor_hub_resume\n");
 404         spin_lock_irqsave(&pdata->dyn_callback_lock, flags);
 405         list_for_each_entry(callback, &pdata->dyn_callback_list, list) {
 406                 if (callback->usage_callback->resume)
 407                         callback->usage_callback->resume(
 408                                         callback->hsdev, callback->priv);
 409         }
 410         spin_unlock_irqrestore(&pdata->dyn_callback_lock, flags);
 411
 412         return 0;
 413 }
 414
 415 static int sensor_hub_reset_resume(struct hid_device *hdev)
 416 {
 417         return 0;
 418 }
 419 #endif
 420
 421 /*
 422  * Handle raw report as sent by device
 423  */
 424 static int sensor_hub_raw_event(struct hid_device *hdev,
 425                 struct hid_report *report, u8 *raw_data, int size)
 426 {
 427         int i;
 428         u8 *ptr;
 429         int sz;
 430         struct sensor_hub_data *pdata = hid_get_drvdata(hdev);
 431         unsigned long flags;
 432         struct hid_sensor_hub_callbacks *callback = NULL;
 433         struct hid_collection *collection = NULL;
 434         void *priv = NULL;
 435         struct hid_sensor_hub_device *hsdev = NULL;
 436
 437         hid_dbg(hdev, "sensor_hub_raw_event report id:0x%x size:%d type:%d\n",
 438                          report->id, size, report->type);
 439         hid_dbg(hdev, "maxfield:%d\n", report->maxfield);
 440         if (report->type != HID_INPUT_REPORT)
 441                 return 1;
 442
 443         ptr = raw_data;
 444         ptr++; /* Skip report id */
 445
 446         spin_lock_irqsave(&pdata->lock, flags);
 447
 448         for (i = 0; i < report->maxfield; ++i) {
 449                 hid_dbg(hdev, "%d collection_index:%x hid:%x sz:%x\n",
 450                                 i, report->field[i]->usage->collection_index,
 451                                 report->field[i]->usage->hid,
 452                                 (report->field[i]->report_size *
 453                                         report->field[i]->report_count)/8);
 454                 sz = (report->field[i]->report_size *
 455                                         report->field[i]->report_count)/8;
 456                 collection = &hdev->collection[
 457                                 report->field[i]->usage->collection_index];
 458                 hid_dbg(hdev, "collection->usage %x\n",
 459                                         collection->usage);
 460
 461                 callback = sensor_hub_get_callback(hdev,
 462                                 report->field[i]->physical,
 463                                 report->field[i]->usage[0].collection_index,
 464                                 &hsdev, &priv);
 465                 if (!callback) {
 466                         ptr += sz;
 467                         continue;
 468                 }
 469                 if (hsdev->pending.status && hsdev->pending.attr_usage_id ==
 470                                 report->field[i]->usage->hid) {
 471                         hid_dbg(hdev, "data was pending ...\n");
 472                         hsdev->pending.raw_data = kmemdup(ptr, sz, GFP_ATOMIC);
 473                         if (hsdev->pending.raw_data)
 474                                 hsdev->pending.raw_size = sz;
 475                         else
 476                                 hsdev->pending.raw_size = 0;
 477                         complete(&hsdev->pending.ready);
 478                 }
 479                 if (callback->capture_sample) {
 480                         if (report->field[i]->logical)
 481                                 callback->capture_sample(hsdev,
 482                                         report->field[i]->logical, sz, ptr,
 483                                         callback->pdev);
 484                         else
 485                                 callback->capture_sample(hsdev,
 486                                         report->field[i]->usage->hid, sz, ptr,
 487                                         callback->pdev);
 488                 }
 489                 ptr += sz;
 490         }
 491         if (callback && collection && callback->send_event)
 492                 callback->send_event(hsdev, collection->usage,
 493                                 callback->pdev);
 494         spin_unlock_irqrestore(&pdata->lock, flags);
 495
 496         return 1;
 497 }
 498
 499 int sensor_hub_device_open(struct hid_sensor_hub_device *hsdev)
 500 {
 501         int ret = 0;
 502         struct sensor_hub_data *data =  hid_get_drvdata(hsdev->hdev);
 503
 504         mutex_lock(&data->mutex);
 505         if (!data->ref_cnt) {
 506                 ret = hid_hw_open(hsdev->hdev);
 507                 if (ret) {
 508                         hid_err(hsdev->hdev, "failed to open hid device\n");
 509                         mutex_unlock(&data->mutex);
 510                         return ret;
 511                 }
 512         }
 513         data->ref_cnt++;
 514         mutex_unlock(&data->mutex);
 515
 516         return ret;
 517 }
 518 EXPORT_SYMBOL_GPL(sensor_hub_device_open);
 519
 520 void sensor_hub_device_close(struct hid_sensor_hub_device *hsdev)
 521 {
 522         struct sensor_hub_data *data =  hid_get_drvdata(hsdev->hdev);
 523
 524         mutex_lock(&data->mutex);
 525         data->ref_cnt--;
 526         if (!data->ref_cnt)
 527                 hid_hw_close(hsdev->hdev);
 528         mutex_unlock(&data->mutex);
 529 }
 530 EXPORT_SYMBOL_GPL(sensor_hub_device_close);
 531
 532 static __u8 *sensor_hub_report_fixup(struct hid_device *hdev, __u8 *rdesc,
 533                 unsigned int *rsize)
 534 {
 535         int index;
 536         struct sensor_hub_data *sd =  hid_get_drvdata(hdev);
 537         unsigned char report_block[] = {
 538                                 0x0a,  0x16, 0x03, 0x15, 0x00, 0x25, 0x05};
 539         unsigned char power_block[] = {
 540                                 0x0a,  0x19, 0x03, 0x15, 0x00, 0x25, 0x05};
 541
 542         if (!(sd->quirks & HID_SENSOR_HUB_ENUM_QUIRK)) {
 543                 hid_dbg(hdev, "No Enum quirks\n");
 544                 return rdesc;
 545         }
 546
 547         /* Looks for power and report state usage id and force to 1 */
 548         for (index = 0; index < *rsize; ++index) {
 549                 if (((*rsize - index) > sizeof(report_block)) &&
 550                         !memcmp(&rdesc[index], report_block,
 551                                                 sizeof(report_block))) {
 552                         rdesc[index + 4] = 0x01;
 553                         index += sizeof(report_block);
 554                 }
 555                 if (((*rsize - index) > sizeof(power_block)) &&
 556                         !memcmp(&rdesc[index], power_block,
 557                                                 sizeof(power_block))) {
 558                         rdesc[index + 4] = 0x01;
 559                         index += sizeof(power_block);
 560                 }
 561         }
 562
 563         return rdesc;
 564 }
 565
 566 static int sensor_hub_probe(struct hid_device *hdev,
 567                                 const struct hid_device_id *id)
 568 {
 569         int ret;
 570         struct sensor_hub_data *sd;
 571         int i;
 572         char *name;
 573         int dev_cnt;
 574         struct hid_sensor_hub_device *hsdev;
 575         struct hid_sensor_hub_device *last_hsdev = NULL;
 576         struct hid_sensor_hub_device *collection_hsdev = NULL;
 577
 578         sd = devm_kzalloc(&hdev->dev, sizeof(*sd), GFP_KERNEL);
 579         if (!sd) {
 580                 hid_err(hdev, "cannot allocate Sensor data\n");
 581                 return -ENOMEM;
 582         }
 583
 584         hid_set_drvdata(hdev, sd);
 585         sd->quirks = id->driver_data;
 586
 587         spin_lock_init(&sd->lock);
 588         spin_lock_init(&sd->dyn_callback_lock);
 589         mutex_init(&sd->mutex);
 590         ret = hid_parse(hdev);
 591         if (ret) {
 592                 hid_err(hdev, "parse failed\n");
 593                 return ret;
 594         }
 595         INIT_LIST_HEAD(&hdev->inputs);
 596
 597         ret = hid_hw_start(hdev, 0);
 598         if (ret) {
 599                 hid_err(hdev, "hw start failed\n");
 600                 return ret;
 601         }
 602         INIT_LIST_HEAD(&sd->dyn_callback_list);
 603         sd->hid_sensor_client_cnt = 0;
 604
 605         dev_cnt = sensor_hub_get_physical_device_count(hdev);
 606         if (dev_cnt > HID_MAX_PHY_DEVICES) {
 607                 hid_err(hdev, "Invalid Physical device count\n");
 608                 ret = -EINVAL;
 609                 goto err_stop_hw;
 610         }
 611         sd->hid_sensor_hub_client_devs = devm_kzalloc(&hdev->dev, dev_cnt *
 612                                                       sizeof(struct mfd_cell),
 613                                                       GFP_KERNEL);
 614         if (sd->hid_sensor_hub_client_devs == NULL) {
 615                 hid_err(hdev, "Failed to allocate memory for mfd cells\n");
 616                         ret = -ENOMEM;
 617                         goto err_stop_hw;
 618         }
 619
 620         for (i = 0; i < hdev->maxcollection; ++i) {
 621                 struct hid_collection *collection = &hdev->collection[i];
 622
 623                 if (collection->type == HID_COLLECTION_PHYSICAL ||
 624                     collection->type == HID_COLLECTION_APPLICATION) {
 625
 626                         hsdev = devm_kzalloc(&hdev->dev, sizeof(*hsdev),
 627                                              GFP_KERNEL);
 628                         if (!hsdev) {
 629                                 hid_err(hdev, "cannot allocate hid_sensor_hub_device\n");
 630                                 ret = -ENOMEM;
 631                                 goto err_stop_hw;
 632                         }
 633                         hsdev->hdev = hdev;
 634                         hsdev->vendor_id = hdev->vendor;
 635                         hsdev->product_id = hdev->product;
 636                         hsdev->usage = collection->usage;
 637                         mutex_init(&hsdev->mutex);
 638                         hsdev->start_collection_index = i;
 639                         if (last_hsdev)
 640                                 last_hsdev->end_collection_index = i;
 641                         last_hsdev = hsdev;
 642                         name = devm_kasprintf(&hdev->dev, GFP_KERNEL,
 643                                               "HID-SENSOR-%x",
 644                                               collection->usage);
 645                         if (name == NULL) {
 646                                 hid_err(hdev, "Failed MFD device name\n");
 647                                         ret = -ENOMEM;
 648                                         goto err_stop_hw;
 649                         }
 650                         sd->hid_sensor_hub_client_devs[
 651                                 sd->hid_sensor_client_cnt].name = name;
 652                         sd->hid_sensor_hub_client_devs[
 653                                 sd->hid_sensor_client_cnt].platform_data =
 654                                                         hsdev;
 655                         sd->hid_sensor_hub_client_devs[
 656                                 sd->hid_sensor_client_cnt].pdata_size =
 657                                                         sizeof(*hsdev);
 658                         hid_dbg(hdev, "Adding %s:%d\n", name,
 659                                         hsdev->start_collection_index);
 660                         sd->hid_sensor_client_cnt++;
 661                         if (collection_hsdev)
 662                                 collection_hsdev->end_collection_index = i;
 663                         if (collection->type == HID_COLLECTION_APPLICATION &&
 664                             collection->usage == HID_USAGE_SENSOR_COLLECTION)
 665                                 collection_hsdev = hsdev;
 666                 }
 667         }
 668         if (last_hsdev)
 669                 last_hsdev->end_collection_index = i;
 670         if (collection_hsdev)
 671                 collection_hsdev->end_collection_index = i;
 672
 673         ret = mfd_add_hotplug_devices(&hdev->dev,
 674                         sd->hid_sensor_hub_client_devs,
 675                         sd->hid_sensor_client_cnt);
 676         if (ret < 0)
 677                 goto err_stop_hw;
 678
 679         return ret;
 680
 681 err_stop_hw:
 682         hid_hw_stop(hdev);
 683
 684         return ret;
 685 }
 686
 687 static void sensor_hub_remove(struct hid_device *hdev)
 688 {
 689         struct sensor_hub_data *data = hid_get_drvdata(hdev);
 690         unsigned long flags;
 691         int i;
 692
 693         hid_dbg(hdev, " hardware removed\n");
 694         hid_hw_close(hdev);
 695         hid_hw_stop(hdev);
 696         spin_lock_irqsave(&data->lock, flags);
 697         for (i = 0; i < data->hid_sensor_client_cnt; ++i) {
 698                 struct hid_sensor_hub_device *hsdev =
 699                         data->hid_sensor_hub_client_devs[i].platform_data;
 700                 if (hsdev->pending.status)
 701                         complete(&hsdev->pending.ready);
 702         }
 703         spin_unlock_irqrestore(&data->lock, flags);
 704         mfd_remove_devices(&hdev->dev);
 705         hid_set_drvdata(hdev, NULL);
 706         mutex_destroy(&data->mutex);
 707 }
 708
 709 static const struct hid_device_id sensor_hub_devices[] = {
 710         { HID_DEVICE(HID_BUS_ANY, HID_GROUP_SENSOR_HUB, USB_VENDOR_ID_INTEL_0,
 711                         USB_DEVICE_ID_INTEL_HID_SENSOR_0),
 712                         .driver_data = HID_SENSOR_HUB_ENUM_QUIRK},
 713         { HID_DEVICE(HID_BUS_ANY, HID_GROUP_SENSOR_HUB, USB_VENDOR_ID_INTEL_1,
 714                         USB_DEVICE_ID_INTEL_HID_SENSOR_0),
 715                         .driver_data = HID_SENSOR_HUB_ENUM_QUIRK},
 716         { HID_DEVICE(HID_BUS_ANY, HID_GROUP_SENSOR_HUB, USB_VENDOR_ID_INTEL_1,
 717                         USB_DEVICE_ID_INTEL_HID_SENSOR_1),
 718                         .driver_data = HID_SENSOR_HUB_ENUM_QUIRK},
 719         { HID_DEVICE(HID_BUS_ANY, HID_GROUP_SENSOR_HUB, USB_VENDOR_ID_MICROSOFT,
 720                         USB_DEVICE_ID_MS_SURFACE_PRO_2),
 721                         .driver_data = HID_SENSOR_HUB_ENUM_QUIRK},
 722         { HID_DEVICE(HID_BUS_ANY, HID_GROUP_SENSOR_HUB, USB_VENDOR_ID_MICROSOFT,
 723                         USB_DEVICE_ID_MS_TOUCH_COVER_2),
 724                         .driver_data = HID_SENSOR_HUB_ENUM_QUIRK},
 725         { HID_DEVICE(HID_BUS_ANY, HID_GROUP_SENSOR_HUB, USB_VENDOR_ID_MICROSOFT,
 726                         USB_DEVICE_ID_MS_TYPE_COVER_2),
 727                         .driver_data = HID_SENSOR_HUB_ENUM_QUIRK},
 728         { HID_DEVICE(HID_BUS_ANY, HID_GROUP_SENSOR_HUB, USB_VENDOR_ID_STM_0,
 729                         USB_DEVICE_ID_STM_HID_SENSOR),
 730                         .driver_data = HID_SENSOR_HUB_ENUM_QUIRK},
 731         { HID_DEVICE(HID_BUS_ANY, HID_GROUP_SENSOR_HUB, USB_VENDOR_ID_STM_0,
 732                         USB_DEVICE_ID_STM_HID_SENSOR_1),
 733                         .driver_data = HID_SENSOR_HUB_ENUM_QUIRK},
 734         { HID_DEVICE(HID_BUS_ANY, HID_GROUP_SENSOR_HUB, USB_VENDOR_ID_TEXAS_INSTRUMENTS,
 735                         USB_DEVICE_ID_TEXAS_INSTRUMENTS_LENOVO_YOGA),
 736                         .driver_data = HID_SENSOR_HUB_ENUM_QUIRK},
 737         { HID_DEVICE(HID_BUS_ANY, HID_GROUP_SENSOR_HUB, HID_ANY_ID,
 738                      HID_ANY_ID) },
 739         { }
 740 };
 741 MODULE_DEVICE_TABLE(hid, sensor_hub_devices);
 742
 743 static struct hid_driver sensor_hub_driver = {
 744         .name = "hid-sensor-hub",
 745         .id_table = sensor_hub_devices,
 746         .probe = sensor_hub_probe,
 747         .remove = sensor_hub_remove,
 748         .raw_event = sensor_hub_raw_event,
 749         .report_fixup = sensor_hub_report_fixup,
 750 #ifdef CONFIG_PM
 751         .suspend = sensor_hub_suspend,
 752         .resume = sensor_hub_resume,
 753         .reset_resume = sensor_hub_reset_resume,
 754 #endif
 755 };
 756 module_hid_driver(sensor_hub_driver);
 757
 758 MODULE_DESCRIPTION("HID Sensor Hub driver");
 759 MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@intel.com>");
 760 MODULE_LICENSE("GPL");