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 = buffer_size % sizeof(__s32);
 222         buffer_size = buffer_size / sizeof(__s32);
 223         if (buffer_size) {
 224                 for (i = 0; i < buffer_size; ++i) {
 225                         hid_set_field(report->field[field_index], i,
 226                                       (__force __s32)cpu_to_le32(*buf32));
 227                         ++buf32;
 228                 }
 229         }
 230         if (remaining_bytes) {
 231                 value = 0;
 232                 memcpy(&value, (u8 *)buf32, remaining_bytes);
 233                 hid_set_field(report->field[field_index], i,
 234                               (__force __s32)cpu_to_le32(value));
 235         }
 236         hid_hw_request(hsdev->hdev, report, HID_REQ_SET_REPORT);
 237         hid_hw_wait(hsdev->hdev);
 238
 239 done_proc:
 240         mutex_unlock(&data->mutex);
 241
 242         return ret;
 243 }
 244 EXPORT_SYMBOL_GPL(sensor_hub_set_feature);
 245
 246 int sensor_hub_get_feature(struct hid_sensor_hub_device *hsdev, u32 report_id,
 247                            u32 field_index, int buffer_size, void *buffer)
 248 {
 249         struct hid_report *report;
 250         struct sensor_hub_data *data = hid_get_drvdata(hsdev->hdev);
 251         int report_size;
 252         int ret = 0;
 253
 254         mutex_lock(&data->mutex);
 255         report = sensor_hub_report(report_id, hsdev->hdev, HID_FEATURE_REPORT);
 256         if (!report || (field_index >= report->maxfield) ||
 257             report->field[field_index]->report_count < 1) {
 258                 ret = -EINVAL;
 259                 goto done_proc;
 260         }
 261         hid_hw_request(hsdev->hdev, report, HID_REQ_GET_REPORT);
 262         hid_hw_wait(hsdev->hdev);
 263
 264         /* calculate number of bytes required to read this field */
 265         report_size = DIV_ROUND_UP(report->field[field_index]->report_size,
 266                                    8) *
 267                                    report->field[field_index]->report_count;
 268         if (!report_size) {
 269                 ret = -EINVAL;
 270                 goto done_proc;
 271         }
 272         ret = min(report_size, buffer_size);
 273         memcpy(buffer, report->field[field_index]->value, ret);
 274
 275 done_proc:
 276         mutex_unlock(&data->mutex);
 277
 278         return ret;
 279 }
 280 EXPORT_SYMBOL_GPL(sensor_hub_get_feature);
 281
 282
 283 int sensor_hub_input_attr_get_raw_value(struct hid_sensor_hub_device *hsdev,
 284                                         u32 usage_id,
 285                                         u32 attr_usage_id, u32 report_id,
 286                                         enum sensor_hub_read_flags flag)
 287 {
 288         struct sensor_hub_data *data = hid_get_drvdata(hsdev->hdev);
 289         unsigned long flags;
 290         struct hid_report *report;
 291         int ret_val = 0;
 292
 293         report = sensor_hub_report(report_id, hsdev->hdev,
 294                                    HID_INPUT_REPORT);
 295         if (!report)
 296                 return -EINVAL;
 297
 298         mutex_lock(hsdev->mutex_ptr);
 299         if (flag == SENSOR_HUB_SYNC) {
 300                 memset(&hsdev->pending, 0, sizeof(hsdev->pending));
 301                 init_completion(&hsdev->pending.ready);
 302                 hsdev->pending.usage_id = usage_id;
 303                 hsdev->pending.attr_usage_id = attr_usage_id;
 304                 hsdev->pending.raw_size = 0;
 305
 306                 spin_lock_irqsave(&data->lock, flags);
 307                 hsdev->pending.status = true;
 308                 spin_unlock_irqrestore(&data->lock, flags);
 309         }
 310         mutex_lock(&data->mutex);
 311         hid_hw_request(hsdev->hdev, report, HID_REQ_GET_REPORT);
 312         mutex_unlock(&data->mutex);
 313         if (flag == SENSOR_HUB_SYNC) {
 314                 wait_for_completion_interruptible_timeout(
 315                                                 &hsdev->pending.ready, HZ*5);
 316                 switch (hsdev->pending.raw_size) {
 317                 case 1:
 318                         ret_val = *(u8 *)hsdev->pending.raw_data;
 319                         break;
 320                 case 2:
 321                         ret_val = *(u16 *)hsdev->pending.raw_data;
 322                         break;
 323                 case 4:
 324                         ret_val = *(u32 *)hsdev->pending.raw_data;
 325                         break;
 326                 default:
 327                         ret_val = 0;
 328                 }
 329                 kfree(hsdev->pending.raw_data);
 330                 hsdev->pending.status = false;
 331         }
 332         mutex_unlock(hsdev->mutex_ptr);
 333
 334         return ret_val;
 335 }
 336 EXPORT_SYMBOL_GPL(sensor_hub_input_attr_get_raw_value);
 337
 338 int hid_sensor_get_usage_index(struct hid_sensor_hub_device *hsdev,
 339                                 u32 report_id, int field_index, u32 usage_id)
 340 {
 341         struct hid_report *report;
 342         struct hid_field *field;
 343         int i;
 344
 345         report = sensor_hub_report(report_id, hsdev->hdev, HID_FEATURE_REPORT);
 346         if (!report || (field_index >= report->maxfield))
 347                 goto done_proc;
 348
 349         field = report->field[field_index];
 350         for (i = 0; i < field->maxusage; ++i) {
 351                 if (field->usage[i].hid == usage_id)
 352                         return field->usage[i].usage_index;
 353         }
 354
 355 done_proc:
 356         return -EINVAL;
 357 }
 358 EXPORT_SYMBOL_GPL(hid_sensor_get_usage_index);
 359
 360 int sensor_hub_input_get_attribute_info(struct hid_sensor_hub_device *hsdev,
 361                                 u8 type,
 362                                 u32 usage_id,
 363                                 u32 attr_usage_id,
 364                                 struct hid_sensor_hub_attribute_info *info)
 365 {
 366         int ret = -1;
 367         int i;
 368         struct hid_report *report;
 369         struct hid_field *field;
 370         struct hid_report_enum *report_enum;
 371         struct hid_device *hdev = hsdev->hdev;
 372
 373         /* Initialize with defaults */
 374         info->usage_id = usage_id;
 375         info->attrib_id = attr_usage_id;
 376         info->report_id = -1;
 377         info->index = -1;
 378         info->units = -1;
 379         info->unit_expo = -1;
 380
 381         report_enum = &hdev->report_enum[type];
 382         list_for_each_entry(report, &report_enum->report_list, list) {
 383                 for (i = 0; i < report->maxfield; ++i) {
 384                         field = report->field[i];
 385                         if (field->maxusage) {
 386                                 if (field->physical == usage_id &&
 387                                         (field->logical == attr_usage_id ||
 388                                         field->usage[0].hid ==
 389                                                         attr_usage_id) &&
 390                                         (field->usage[0].collection_index >=
 391                                         hsdev->start_collection_index) &&
 392                                         (field->usage[0].collection_index <
 393                                         hsdev->end_collection_index)) {
 394
 395                                         sensor_hub_fill_attr_info(info, i,
 396                                                                 report->id,
 397                                                                 field);
 398                                         ret = 0;
 399                                         break;
 400                                 }
 401                         }
 402                 }
 403
 404         }
 405
 406         return ret;
 407 }
 408 EXPORT_SYMBOL_GPL(sensor_hub_input_get_attribute_info);
 409
 410 #ifdef CONFIG_PM
 411 static int sensor_hub_suspend(struct hid_device *hdev, pm_message_t message)
 412 {
 413         struct sensor_hub_data *pdata = hid_get_drvdata(hdev);
 414         struct hid_sensor_hub_callbacks_list *callback;
 415         unsigned long flags;
 416
 417         hid_dbg(hdev, " sensor_hub_suspend\n");
 418         spin_lock_irqsave(&pdata->dyn_callback_lock, flags);
 419         list_for_each_entry(callback, &pdata->dyn_callback_list, list) {
 420                 if (callback->usage_callback->suspend)
 421                         callback->usage_callback->suspend(
 422                                         callback->hsdev, callback->priv);
 423         }
 424         spin_unlock_irqrestore(&pdata->dyn_callback_lock, flags);
 425
 426         return 0;
 427 }
 428
 429 static int sensor_hub_resume(struct hid_device *hdev)
 430 {
 431         struct sensor_hub_data *pdata = hid_get_drvdata(hdev);
 432         struct hid_sensor_hub_callbacks_list *callback;
 433         unsigned long flags;
 434
 435         hid_dbg(hdev, " sensor_hub_resume\n");
 436         spin_lock_irqsave(&pdata->dyn_callback_lock, flags);
 437         list_for_each_entry(callback, &pdata->dyn_callback_list, list) {
 438                 if (callback->usage_callback->resume)
 439                         callback->usage_callback->resume(
 440                                         callback->hsdev, callback->priv);
 441         }
 442         spin_unlock_irqrestore(&pdata->dyn_callback_lock, flags);
 443
 444         return 0;
 445 }
 446
 447 static int sensor_hub_reset_resume(struct hid_device *hdev)
 448 {
 449         return 0;
 450 }
 451 #endif
 452
 453 /*
 454  * Handle raw report as sent by device
 455  */
 456 static int sensor_hub_raw_event(struct hid_device *hdev,
 457                 struct hid_report *report, u8 *raw_data, int size)
 458 {
 459         int i;
 460         u8 *ptr;
 461         int sz;
 462         struct sensor_hub_data *pdata = hid_get_drvdata(hdev);
 463         unsigned long flags;
 464         struct hid_sensor_hub_callbacks *callback = NULL;
 465         struct hid_collection *collection = NULL;
 466         void *priv = NULL;
 467         struct hid_sensor_hub_device *hsdev = NULL;
 468
 469         hid_dbg(hdev, "sensor_hub_raw_event report id:0x%x size:%d type:%d\n",
 470                          report->id, size, report->type);
 471         hid_dbg(hdev, "maxfield:%d\n", report->maxfield);
 472         if (report->type != HID_INPUT_REPORT)
 473                 return 1;
 474
 475         ptr = raw_data;
 476         ptr++; /* Skip report id */
 477
 478         spin_lock_irqsave(&pdata->lock, flags);
 479
 480         for (i = 0; i < report->maxfield; ++i) {
 481                 hid_dbg(hdev, "%d collection_index:%x hid:%x sz:%x\n",
 482                                 i, report->field[i]->usage->collection_index,
 483                                 report->field[i]->usage->hid,
 484                                 (report->field[i]->report_size *
 485                                         report->field[i]->report_count)/8);
 486                 sz = (report->field[i]->report_size *
 487                                         report->field[i]->report_count)/8;
 488                 collection = &hdev->collection[
 489                                 report->field[i]->usage->collection_index];
 490                 hid_dbg(hdev, "collection->usage %x\n",
 491                                         collection->usage);
 492
 493                 callback = sensor_hub_get_callback(hdev,
 494                                 report->field[i]->physical,
 495                                 report->field[i]->usage[0].collection_index,
 496                                 &hsdev, &priv);
 497                 if (!callback) {
 498                         ptr += sz;
 499                         continue;
 500                 }
 501                 if (hsdev->pending.status && (hsdev->pending.attr_usage_id ==
 502                                               report->field[i]->usage->hid ||
 503                                               hsdev->pending.attr_usage_id ==
 504                                               report->field[i]->logical)) {
 505                         hid_dbg(hdev, "data was pending ...\n");
 506                         hsdev->pending.raw_data = kmemdup(ptr, sz, GFP_ATOMIC);
 507                         if (hsdev->pending.raw_data)
 508                                 hsdev->pending.raw_size = sz;
 509                         else
 510                                 hsdev->pending.raw_size = 0;
 511                         complete(&hsdev->pending.ready);
 512                 }
 513                 if (callback->capture_sample) {
 514                         if (report->field[i]->logical)
 515                                 callback->capture_sample(hsdev,
 516                                         report->field[i]->logical, sz, ptr,
 517                                         callback->pdev);
 518                         else
 519                                 callback->capture_sample(hsdev,
 520                                         report->field[i]->usage->hid, sz, ptr,
 521                                         callback->pdev);
 522                 }
 523                 ptr += sz;
 524         }
 525         if (callback && collection && callback->send_event)
 526                 callback->send_event(hsdev, collection->usage,
 527                                 callback->pdev);
 528         spin_unlock_irqrestore(&pdata->lock, flags);
 529
 530         return 1;
 531 }
 532
 533 int sensor_hub_device_open(struct hid_sensor_hub_device *hsdev)
 534 {
 535         int ret = 0;
 536         struct sensor_hub_data *data =  hid_get_drvdata(hsdev->hdev);
 537
 538         mutex_lock(&data->mutex);
 539         if (!data->ref_cnt) {
 540                 ret = hid_hw_open(hsdev->hdev);
 541                 if (ret) {
 542                         hid_err(hsdev->hdev, "failed to open hid device\n");
 543                         mutex_unlock(&data->mutex);
 544                         return ret;
 545                 }
 546         }
 547         data->ref_cnt++;
 548         mutex_unlock(&data->mutex);
 549
 550         return ret;
 551 }
 552 EXPORT_SYMBOL_GPL(sensor_hub_device_open);
 553
 554 void sensor_hub_device_close(struct hid_sensor_hub_device *hsdev)
 555 {
 556         struct sensor_hub_data *data =  hid_get_drvdata(hsdev->hdev);
 557
 558         mutex_lock(&data->mutex);
 559         data->ref_cnt--;
 560         if (!data->ref_cnt)
 561                 hid_hw_close(hsdev->hdev);
 562         mutex_unlock(&data->mutex);
 563 }
 564 EXPORT_SYMBOL_GPL(sensor_hub_device_close);
 565
 566 static __u8 *sensor_hub_report_fixup(struct hid_device *hdev, __u8 *rdesc,
 567                 unsigned int *rsize)
 568 {
 569         int index;
 570         struct sensor_hub_data *sd =  hid_get_drvdata(hdev);
 571         unsigned char report_block[] = {
 572                                 0x0a,  0x16, 0x03, 0x15, 0x00, 0x25, 0x05};
 573         unsigned char power_block[] = {
 574                                 0x0a,  0x19, 0x03, 0x15, 0x00, 0x25, 0x05};
 575
 576         if (!(sd->quirks & HID_SENSOR_HUB_ENUM_QUIRK)) {
 577                 hid_dbg(hdev, "No Enum quirks\n");
 578                 return rdesc;
 579         }
 580
 581         /* Looks for power and report state usage id and force to 1 */
 582         for (index = 0; index < *rsize; ++index) {
 583                 if (((*rsize - index) > sizeof(report_block)) &&
 584                         !memcmp(&rdesc[index], report_block,
 585                                                 sizeof(report_block))) {
 586                         rdesc[index + 4] = 0x01;
 587                         index += sizeof(report_block);
 588                 }
 589                 if (((*rsize - index) > sizeof(power_block)) &&
 590                         !memcmp(&rdesc[index], power_block,
 591                                                 sizeof(power_block))) {
 592                         rdesc[index + 4] = 0x01;
 593                         index += sizeof(power_block);
 594                 }
 595         }
 596
 597         /* Checks if the report descriptor of Thinkpad Helix 2 has a logical
 598          * minimum for magnetic flux axis greater than the maximum */
 599         if (hdev->product == USB_DEVICE_ID_TEXAS_INSTRUMENTS_LENOVO_YOGA &&
 600                 *rsize == 2558 && rdesc[913] == 0x17 && rdesc[914] == 0x40 &&
 601                 rdesc[915] == 0x81 && rdesc[916] == 0x08 &&
 602                 rdesc[917] == 0x00 && rdesc[918] == 0x27 &&
 603                 rdesc[921] == 0x07 && rdesc[922] == 0x00) {
 604                 /* Sets negative logical minimum for mag x, y and z */
 605                 rdesc[914] = rdesc[935] = rdesc[956] = 0xc0;
 606                 rdesc[915] = rdesc[936] = rdesc[957] = 0x7e;
 607                 rdesc[916] = rdesc[937] = rdesc[958] = 0xf7;
 608                 rdesc[917] = rdesc[938] = rdesc[959] = 0xff;
 609         }
 610
 611         return rdesc;
 612 }
 613
 614 static int sensor_hub_probe(struct hid_device *hdev,
 615                                 const struct hid_device_id *id)
 616 {
 617         int ret;
 618         struct sensor_hub_data *sd;
 619         int i;
 620         char *name;
 621         int dev_cnt;
 622         struct hid_sensor_hub_device *hsdev;
 623         struct hid_sensor_hub_device *last_hsdev = NULL;
 624         struct hid_sensor_hub_device *collection_hsdev = NULL;
 625
 626         sd = devm_kzalloc(&hdev->dev, sizeof(*sd), GFP_KERNEL);
 627         if (!sd) {
 628                 hid_err(hdev, "cannot allocate Sensor data\n");
 629                 return -ENOMEM;
 630         }
 631
 632         hid_set_drvdata(hdev, sd);
 633         sd->quirks = id->driver_data;
 634
 635         spin_lock_init(&sd->lock);
 636         spin_lock_init(&sd->dyn_callback_lock);
 637         mutex_init(&sd->mutex);
 638         ret = hid_parse(hdev);
 639         if (ret) {
 640                 hid_err(hdev, "parse failed\n");
 641                 return ret;
 642         }
 643         INIT_LIST_HEAD(&hdev->inputs);
 644
 645         ret = hid_hw_start(hdev, 0);
 646         if (ret) {
 647                 hid_err(hdev, "hw start failed\n");
 648                 return ret;
 649         }
 650         INIT_LIST_HEAD(&sd->dyn_callback_list);
 651         sd->hid_sensor_client_cnt = 0;
 652
 653         dev_cnt = sensor_hub_get_physical_device_count(hdev);
 654         if (dev_cnt > HID_MAX_PHY_DEVICES) {
 655                 hid_err(hdev, "Invalid Physical device count\n");
 656                 ret = -EINVAL;
 657                 goto err_stop_hw;
 658         }
 659         sd->hid_sensor_hub_client_devs = devm_kzalloc(&hdev->dev, dev_cnt *
 660                                                       sizeof(struct mfd_cell),
 661                                                       GFP_KERNEL);
 662         if (sd->hid_sensor_hub_client_devs == NULL) {
 663                 hid_err(hdev, "Failed to allocate memory for mfd cells\n");
 664                 ret = -ENOMEM;
 665                 goto err_stop_hw;
 666         }
 667
 668         for (i = 0; i < hdev->maxcollection; ++i) {
 669                 struct hid_collection *collection = &hdev->collection[i];
 670
 671                 if (collection->type == HID_COLLECTION_PHYSICAL ||
 672                     collection->type == HID_COLLECTION_APPLICATION) {
 673
 674                         hsdev = devm_kzalloc(&hdev->dev, sizeof(*hsdev),
 675                                              GFP_KERNEL);
 676                         if (!hsdev) {
 677                                 hid_err(hdev, "cannot allocate hid_sensor_hub_device\n");
 678                                 ret = -ENOMEM;
 679                                 goto err_stop_hw;
 680                         }
 681                         hsdev->hdev = hdev;
 682                         hsdev->vendor_id = hdev->vendor;
 683                         hsdev->product_id = hdev->product;
 684                         hsdev->usage = collection->usage;
 685                         hsdev->mutex_ptr = devm_kzalloc(&hdev->dev,
 686                                                         sizeof(struct mutex),
 687                                                         GFP_KERNEL);
 688                         if (!hsdev->mutex_ptr) {
 689                                 ret = -ENOMEM;
 690                                 goto err_stop_hw;
 691                         }
 692                         mutex_init(hsdev->mutex_ptr);
 693                         hsdev->start_collection_index = i;
 694                         if (last_hsdev)
 695                                 last_hsdev->end_collection_index = i;
 696                         last_hsdev = hsdev;
 697                         name = devm_kasprintf(&hdev->dev, GFP_KERNEL,
 698                                               "HID-SENSOR-%x",
 699                                               collection->usage);
 700                         if (name == NULL) {
 701                                 hid_err(hdev, "Failed MFD device name\n");
 702                                 ret = -ENOMEM;
 703                                 goto err_stop_hw;
 704                         }
 705                         sd->hid_sensor_hub_client_devs[
 706                                 sd->hid_sensor_client_cnt].name = name;
 707                         sd->hid_sensor_hub_client_devs[
 708                                 sd->hid_sensor_client_cnt].platform_data =
 709                                                         hsdev;
 710                         sd->hid_sensor_hub_client_devs[
 711                                 sd->hid_sensor_client_cnt].pdata_size =
 712                                                         sizeof(*hsdev);
 713                         hid_dbg(hdev, "Adding %s:%d\n", name,
 714                                         hsdev->start_collection_index);
 715                         sd->hid_sensor_client_cnt++;
 716                         if (collection_hsdev)
 717                                 collection_hsdev->end_collection_index = i;
 718                         if (collection->type == HID_COLLECTION_APPLICATION &&
 719                             collection->usage == HID_USAGE_SENSOR_COLLECTION)
 720                                 collection_hsdev = hsdev;
 721                 }
 722         }
 723         if (last_hsdev)
 724                 last_hsdev->end_collection_index = i;
 725         if (collection_hsdev)
 726                 collection_hsdev->end_collection_index = i;
 727
 728         ret = mfd_add_hotplug_devices(&hdev->dev,
 729                         sd->hid_sensor_hub_client_devs,
 730                         sd->hid_sensor_client_cnt);
 731         if (ret < 0)
 732                 goto err_stop_hw;
 733
 734         return ret;
 735
 736 err_stop_hw:
 737         hid_hw_stop(hdev);
 738
 739         return ret;
 740 }
 741
 742 static void sensor_hub_remove(struct hid_device *hdev)
 743 {
 744         struct sensor_hub_data *data = hid_get_drvdata(hdev);
 745         unsigned long flags;
 746         int i;
 747
 748         hid_dbg(hdev, " hardware removed\n");
 749         hid_hw_close(hdev);
 750         hid_hw_stop(hdev);
 751         spin_lock_irqsave(&data->lock, flags);
 752         for (i = 0; i < data->hid_sensor_client_cnt; ++i) {
 753                 struct hid_sensor_hub_device *hsdev =
 754                         data->hid_sensor_hub_client_devs[i].platform_data;
 755                 if (hsdev->pending.status)
 756                         complete(&hsdev->pending.ready);
 757         }
 758         spin_unlock_irqrestore(&data->lock, flags);
 759         mfd_remove_devices(&hdev->dev);
 760         hid_set_drvdata(hdev, NULL);
 761         mutex_destroy(&data->mutex);
 762 }
 763
 764 static const struct hid_device_id sensor_hub_devices[] = {
 765         { HID_DEVICE(HID_BUS_ANY, HID_GROUP_SENSOR_HUB, USB_VENDOR_ID_INTEL_0,
 766                         USB_DEVICE_ID_INTEL_HID_SENSOR_0),
 767                         .driver_data = HID_SENSOR_HUB_ENUM_QUIRK},
 768         { HID_DEVICE(HID_BUS_ANY, HID_GROUP_SENSOR_HUB, USB_VENDOR_ID_INTEL_1,
 769                         USB_DEVICE_ID_INTEL_HID_SENSOR_0),
 770                         .driver_data = HID_SENSOR_HUB_ENUM_QUIRK},
 771         { HID_DEVICE(HID_BUS_ANY, HID_GROUP_SENSOR_HUB, USB_VENDOR_ID_INTEL_1,
 772                         USB_DEVICE_ID_INTEL_HID_SENSOR_1),
 773                         .driver_data = HID_SENSOR_HUB_ENUM_QUIRK},
 774         { HID_DEVICE(HID_BUS_ANY, HID_GROUP_SENSOR_HUB, USB_VENDOR_ID_MICROSOFT,
 775                         USB_DEVICE_ID_MS_SURFACE_PRO_2),
 776                         .driver_data = HID_SENSOR_HUB_ENUM_QUIRK},
 777         { HID_DEVICE(HID_BUS_ANY, HID_GROUP_SENSOR_HUB, USB_VENDOR_ID_MICROSOFT,
 778                         USB_DEVICE_ID_MS_TOUCH_COVER_2),
 779                         .driver_data = HID_SENSOR_HUB_ENUM_QUIRK},
 780         { HID_DEVICE(HID_BUS_ANY, HID_GROUP_SENSOR_HUB, USB_VENDOR_ID_MICROSOFT,
 781                         USB_DEVICE_ID_MS_TYPE_COVER_2),
 782                         .driver_data = HID_SENSOR_HUB_ENUM_QUIRK},
 783         { HID_DEVICE(HID_BUS_ANY, HID_GROUP_SENSOR_HUB, USB_VENDOR_ID_STM_0,
 784                         USB_DEVICE_ID_STM_HID_SENSOR),
 785                         .driver_data = HID_SENSOR_HUB_ENUM_QUIRK},
 786         { HID_DEVICE(HID_BUS_ANY, HID_GROUP_SENSOR_HUB, USB_VENDOR_ID_STM_0,
 787                         USB_DEVICE_ID_STM_HID_SENSOR_1),
 788                         .driver_data = HID_SENSOR_HUB_ENUM_QUIRK},
 789         { HID_DEVICE(HID_BUS_ANY, HID_GROUP_SENSOR_HUB, USB_VENDOR_ID_TEXAS_INSTRUMENTS,
 790                         USB_DEVICE_ID_TEXAS_INSTRUMENTS_LENOVO_YOGA),
 791                         .driver_data = HID_SENSOR_HUB_ENUM_QUIRK},
 792         { HID_DEVICE(HID_BUS_ANY, HID_GROUP_SENSOR_HUB, USB_VENDOR_ID_ITE,
 793                         USB_DEVICE_ID_ITE_LENOVO_YOGA),
 794                         .driver_data = HID_SENSOR_HUB_ENUM_QUIRK},
 795         { HID_DEVICE(HID_BUS_ANY, HID_GROUP_SENSOR_HUB, USB_VENDOR_ID_ITE,
 796                         USB_DEVICE_ID_ITE_LENOVO_YOGA2),
 797                         .driver_data = HID_SENSOR_HUB_ENUM_QUIRK},
 798         { HID_DEVICE(HID_BUS_ANY, HID_GROUP_SENSOR_HUB, USB_VENDOR_ID_ITE,
 799                         USB_DEVICE_ID_ITE_LENOVO_YOGA900),
 800                         .driver_data = HID_SENSOR_HUB_ENUM_QUIRK},
 801         { HID_DEVICE(HID_BUS_ANY, HID_GROUP_SENSOR_HUB, HID_ANY_ID,
 802                      HID_ANY_ID) },
 803         { }
 804 };
 805 MODULE_DEVICE_TABLE(hid, sensor_hub_devices);
 806
 807 static struct hid_driver sensor_hub_driver = {
 808         .name = "hid-sensor-hub",
 809         .id_table = sensor_hub_devices,
 810         .probe = sensor_hub_probe,
 811         .remove = sensor_hub_remove,
 812         .raw_event = sensor_hub_raw_event,
 813         .report_fixup = sensor_hub_report_fixup,
 814 #ifdef CONFIG_PM
 815         .suspend = sensor_hub_suspend,
 816         .resume = sensor_hub_resume,
 817         .reset_resume = sensor_hub_reset_resume,
 818 #endif
 819 };
 820 module_hid_driver(sensor_hub_driver);
 821
 822 MODULE_DESCRIPTION("HID Sensor Hub driver");
 823 MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@intel.com>");
 824 MODULE_LICENSE("GPL");