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
  20 #include <linux/device.h>
  21 #include <linux/hid.h>
  22 #include <linux/module.h>
  23 #include <linux/slab.h>
  24 #include <linux/mfd/core.h>
  25 #include <linux/list.h>
  26 #include <linux/hid-sensor-ids.h>
  27 #include <linux/hid-sensor-hub.h>
  28 #include "hid-ids.h"
  29
  30 #define HID_SENSOR_HUB_ENUM_QUIRK       0x01
  31
  32 /**
  33  * struct sensor_hub_data - Hold a instance data for a HID hub device
  34  * @hsdev:              Stored hid instance for current hub device.
  35  * @mutex:              Mutex to serialize synchronous request.
  36  * @lock:               Spin lock to protect pending request structure.
  37  * @dyn_callback_list:  Holds callback function
  38  * @dyn_callback_lock:  spin lock to protect callback list
  39  * @hid_sensor_hub_client_devs: Stores all MFD cells for a hub instance.
  40  * @hid_sensor_client_cnt: Number of MFD cells, (no of sensors attached).
  41  * @ref_cnt:            Number of MFD clients have opened this device
  42  */
  43 struct sensor_hub_data {
  44         struct mutex mutex;
  45         spinlock_t lock;
  46         struct list_head dyn_callback_list;
  47         spinlock_t dyn_callback_lock;
  48         struct mfd_cell *hid_sensor_hub_client_devs;
  49         int hid_sensor_client_cnt;
  50         unsigned long quirks;
  51         int ref_cnt;
  52 };
  53
  54 /**
  55  * struct hid_sensor_hub_callbacks_list - Stores callback list
  56  * @list:               list head.
  57  * @usage_id:           usage id for a physical device.
  58  * @usage_callback:     Stores registered callback functions.
  59  * @priv:               Private data for a physical device.
  60  */
  61 struct hid_sensor_hub_callbacks_list {
  62         struct list_head list;
  63         u32 usage_id;
  64         struct hid_sensor_hub_device *hsdev;
  65         struct hid_sensor_hub_callbacks *usage_callback;
  66         void *priv;
  67 };
  68
  69 static struct hid_report *sensor_hub_report(int id, struct hid_device *hdev,
  70                                                 int dir)
  71 {
  72         struct hid_report *report;
  73
  74         list_for_each_entry(report, &hdev->report_enum[dir].report_list, list) {
  75                 if (report->id == id)
  76                         return report;
  77         }
  78         hid_warn(hdev, "No report with id 0x%x found\n", id);
  79
  80         return NULL;
  81 }
  82
  83 static int sensor_hub_get_physical_device_count(struct hid_device *hdev)
  84 {
  85         int i;
  86         int count = 0;
  87
  88         for (i = 0; i < hdev->maxcollection; ++i) {
  89                 struct hid_collection *collection = &hdev->collection[i];
  90                 if (collection->type == HID_COLLECTION_PHYSICAL ||
  91                     collection->type == HID_COLLECTION_APPLICATION)
  92                         ++count;
  93         }
  94
  95         return count;
  96 }
  97
  98 static void sensor_hub_fill_attr_info(
  99                 struct hid_sensor_hub_attribute_info *info,
 100                 s32 index, s32 report_id, struct hid_field *field)
 101 {
 102         info->index = index;
 103         info->report_id = report_id;
 104         info->units = field->unit;
 105         info->unit_expo = field->unit_exponent;
 106         info->size = (field->report_size * field->report_count)/8;
 107         info->logical_minimum = field->logical_minimum;
 108         info->logical_maximum = field->logical_maximum;
 109 }
 110
 111 static struct hid_sensor_hub_callbacks *sensor_hub_get_callback(
 112                                         struct hid_device *hdev,
 113                                         u32 usage_id,
 114                                         int collection_index,
 115                                         struct hid_sensor_hub_device **hsdev,
 116                                         void **priv)
 117 {
 118         struct hid_sensor_hub_callbacks_list *callback;
 119         struct sensor_hub_data *pdata = hid_get_drvdata(hdev);
 120         unsigned long flags;
 121
 122         spin_lock_irqsave(&pdata->dyn_callback_lock, flags);
 123         list_for_each_entry(callback, &pdata->dyn_callback_list, list)
 124                 if ((callback->usage_id == usage_id ||
 125                      callback->usage_id == HID_USAGE_SENSOR_COLLECTION) &&
 126                         (collection_index >=
 127                                 callback->hsdev->start_collection_index) &&
 128                         (collection_index <
 129                                 callback->hsdev->end_collection_index)) {
 130                         *priv = callback->priv;
 131                         *hsdev = callback->hsdev;
 132                         spin_unlock_irqrestore(&pdata->dyn_callback_lock,
 133                                                flags);
 134                         return callback->usage_callback;
 135                 }
 136         spin_unlock_irqrestore(&pdata->dyn_callback_lock, flags);
 137
 138         return NULL;
 139 }
 140
 141 int sensor_hub_register_callback(struct hid_sensor_hub_device *hsdev,
 142                         u32 usage_id,
 143                         struct hid_sensor_hub_callbacks *usage_callback)
 144 {
 145         struct hid_sensor_hub_callbacks_list *callback;
 146         struct sensor_hub_data *pdata = hid_get_drvdata(hsdev->hdev);
 147         unsigned long flags;
 148
 149         spin_lock_irqsave(&pdata->dyn_callback_lock, flags);
 150         list_for_each_entry(callback, &pdata->dyn_callback_list, list)
 151                 if (callback->usage_id == usage_id &&
 152                                                 callback->hsdev == hsdev) {
 153                         spin_unlock_irqrestore(&pdata->dyn_callback_lock, flags);
 154                         return -EINVAL;
 155                 }
 156         callback = kzalloc(sizeof(*callback), GFP_ATOMIC);
 157         if (!callback) {
 158                 spin_unlock_irqrestore(&pdata->dyn_callback_lock, flags);
 159                 return -ENOMEM;
 160         }
 161         callback->hsdev = hsdev;
 162         callback->usage_callback = usage_callback;
 163         callback->usage_id = usage_id;
 164         callback->priv = NULL;
 165         /*
 166          * If there is a handler registered for the collection type, then
 167          * it will handle all reports for sensors in this collection. If
 168          * there is also an individual sensor handler registration, then
 169          * we want to make sure that the reports are directed to collection
 170          * handler, as this may be a fusion sensor. So add collection handlers
 171          * to the beginning of the list, so that they are matched first.
 172          */
 173         if (usage_id == HID_USAGE_SENSOR_COLLECTION)
 174                 list_add(&callback->list, &pdata->dyn_callback_list);
 175         else
 176                 list_add_tail(&callback->list, &pdata->dyn_callback_list);
 177         spin_unlock_irqrestore(&pdata->dyn_callback_lock, flags);
 178
 179         return 0;
 180 }
 181 EXPORT_SYMBOL_GPL(sensor_hub_register_callback);
 182
 183 int sensor_hub_remove_callback(struct hid_sensor_hub_device *hsdev,
 184                                 u32 usage_id)
 185 {
 186         struct hid_sensor_hub_callbacks_list *callback;
 187         struct sensor_hub_data *pdata = hid_get_drvdata(hsdev->hdev);
 188         unsigned long flags;
 189
 190         spin_lock_irqsave(&pdata->dyn_callback_lock, flags);
 191         list_for_each_entry(callback, &pdata->dyn_callback_list, list)
 192                 if (callback->usage_id == usage_id &&
 193                                                 callback->hsdev == hsdev) {
 194                         list_del(&callback->list);
 195                         kfree(callback);
 196                         break;
 197                 }
 198         spin_unlock_irqrestore(&pdata->dyn_callback_lock, flags);
 199
 200         return 0;
 201 }
 202 EXPORT_SYMBOL_GPL(sensor_hub_remove_callback);
 203
 204 int sensor_hub_set_feature(struct hid_sensor_hub_device *hsdev, u32 report_id,
 205                            u32 field_index, int buffer_size, void *buffer)
 206 {
 207         struct hid_report *report;
 208         struct sensor_hub_data *data = hid_get_drvdata(hsdev->hdev);
 209         __s32 *buf32 = buffer;
 210         int i = 0;
 211         int remaining_bytes;
 212         __s32 value;
 213         int ret = 0;
 214
 215         mutex_lock(&data->mutex);
 216         report = sensor_hub_report(report_id, hsdev->hdev, HID_FEATURE_REPORT);
 217         if (!report || (field_index >= report->maxfield)) {
 218                 ret = -EINVAL;
 219                 goto done_proc;
 220         }
 221
 222         remaining_bytes = buffer_size % sizeof(__s32);
 223         buffer_size = buffer_size / sizeof(__s32);
 224         if (buffer_size) {
 225                 for (i = 0; i < buffer_size; ++i) {
 226                         hid_set_field(report->field[field_index], i,
 227                                       (__force __s32)cpu_to_le32(*buf32));
 228                         ++buf32;
 229                 }
 230         }
 231         if (remaining_bytes) {
 232                 value = 0;
 233                 memcpy(&value, (u8 *)buf32, remaining_bytes);
 234                 hid_set_field(report->field[field_index], i,
 235                               (__force __s32)cpu_to_le32(value));
 236         }
 237         hid_hw_request(hsdev->hdev, report, HID_REQ_SET_REPORT);
 238         hid_hw_wait(hsdev->hdev);
 239
 240 done_proc:
 241         mutex_unlock(&data->mutex);
 242
 243         return ret;
 244 }
 245 EXPORT_SYMBOL_GPL(sensor_hub_set_feature);
 246
 247 int sensor_hub_get_feature(struct hid_sensor_hub_device *hsdev, u32 report_id,
 248                            u32 field_index, int buffer_size, void *buffer)
 249 {
 250         struct hid_report *report;
 251         struct sensor_hub_data *data = hid_get_drvdata(hsdev->hdev);
 252         int report_size;
 253         int ret = 0;
 254
 255         mutex_lock(&data->mutex);
 256         report = sensor_hub_report(report_id, hsdev->hdev, HID_FEATURE_REPORT);
 257         if (!report || (field_index >= report->maxfield) ||
 258             report->field[field_index]->report_count < 1) {
 259                 ret = -EINVAL;
 260                 goto done_proc;
 261         }
 262         hid_hw_request(hsdev->hdev, report, HID_REQ_GET_REPORT);
 263         hid_hw_wait(hsdev->hdev);
 264
 265         /* calculate number of bytes required to read this field */
 266         report_size = DIV_ROUND_UP(report->field[field_index]->report_size,
 267                                    8) *
 268                                    report->field[field_index]->report_count;
 269         if (!report_size) {
 270                 ret = -EINVAL;
 271                 goto done_proc;
 272         }
 273         ret = min(report_size, buffer_size);
 274         memcpy(buffer, report->field[field_index]->value, ret);
 275
 276 done_proc:
 277         mutex_unlock(&data->mutex);
 278
 279         return ret;
 280 }
 281 EXPORT_SYMBOL_GPL(sensor_hub_get_feature);
 282
 283
 284 int sensor_hub_input_attr_get_raw_value(struct hid_sensor_hub_device *hsdev,
 285                                         u32 usage_id,
 286                                         u32 attr_usage_id, u32 report_id,
 287                                         enum sensor_hub_read_flags flag)
 288 {
 289         struct sensor_hub_data *data = hid_get_drvdata(hsdev->hdev);
 290         unsigned long flags;
 291         struct hid_report *report;
 292         int ret_val = 0;
 293
 294         report = sensor_hub_report(report_id, hsdev->hdev,
 295                                    HID_INPUT_REPORT);
 296         if (!report)
 297                 return -EINVAL;
 298
 299         mutex_lock(hsdev->mutex_ptr);
 300         if (flag == SENSOR_HUB_SYNC) {
 301                 memset(&hsdev->pending, 0, sizeof(hsdev->pending));
 302                 init_completion(&hsdev->pending.ready);
 303                 hsdev->pending.usage_id = usage_id;
 304                 hsdev->pending.attr_usage_id = attr_usage_id;
 305                 hsdev->pending.raw_size = 0;
 306
 307                 spin_lock_irqsave(&data->lock, flags);
 308                 hsdev->pending.status = true;
 309                 spin_unlock_irqrestore(&data->lock, flags);
 310         }
 311         mutex_lock(&data->mutex);
 312         hid_hw_request(hsdev->hdev, report, HID_REQ_GET_REPORT);
 313         mutex_unlock(&data->mutex);
 314         if (flag == SENSOR_HUB_SYNC) {
 315                 wait_for_completion_interruptible_timeout(
 316                                                 &hsdev->pending.ready, HZ*5);
 317                 switch (hsdev->pending.raw_size) {
 318                 case 1:
 319                         ret_val = *(u8 *)hsdev->pending.raw_data;
 320                         break;
 321                 case 2:
 322                         ret_val = *(u16 *)hsdev->pending.raw_data;
 323                         break;
 324                 case 4:
 325                         ret_val = *(u32 *)hsdev->pending.raw_data;
 326                         break;
 327                 default:
 328                         ret_val = 0;
 329                 }
 330                 kfree(hsdev->pending.raw_data);
 331                 hsdev->pending.status = false;
 332         }
 333         mutex_unlock(hsdev->mutex_ptr);
 334
 335         return ret_val;
 336 }
 337 EXPORT_SYMBOL_GPL(sensor_hub_input_attr_get_raw_value);
 338
 339 int hid_sensor_get_usage_index(struct hid_sensor_hub_device *hsdev,
 340                                 u32 report_id, int field_index, u32 usage_id)
 341 {
 342         struct hid_report *report;
 343         struct hid_field *field;
 344         int i;
 345
 346         report = sensor_hub_report(report_id, hsdev->hdev, HID_FEATURE_REPORT);
 347         if (!report || (field_index >= report->maxfield))
 348                 goto done_proc;
 349
 350         field = report->field[field_index];
 351         for (i = 0; i < field->maxusage; ++i) {
 352                 if (field->usage[i].hid == usage_id)
 353                         return field->usage[i].usage_index;
 354         }
 355
 356 done_proc:
 357         return -EINVAL;
 358 }
 359 EXPORT_SYMBOL_GPL(hid_sensor_get_usage_index);
 360
 361 int sensor_hub_input_get_attribute_info(struct hid_sensor_hub_device *hsdev,
 362                                 u8 type,
 363                                 u32 usage_id,
 364                                 u32 attr_usage_id,
 365                                 struct hid_sensor_hub_attribute_info *info)
 366 {
 367         int ret = -1;
 368         int i;
 369         struct hid_report *report;
 370         struct hid_field *field;
 371         struct hid_report_enum *report_enum;
 372         struct hid_device *hdev = hsdev->hdev;
 373
 374         /* Initialize with defaults */
 375         info->usage_id = usage_id;
 376         info->attrib_id = attr_usage_id;
 377         info->report_id = -1;
 378         info->index = -1;
 379         info->units = -1;
 380         info->unit_expo = -1;
 381
 382         report_enum = &hdev->report_enum[type];
 383         list_for_each_entry(report, &report_enum->report_list, list) {
 384                 for (i = 0; i < report->maxfield; ++i) {
 385                         field = report->field[i];
 386                         if (field->maxusage) {
 387                                 if (field->physical == usage_id &&
 388                                         (field->logical == attr_usage_id ||
 389                                         field->usage[0].hid ==
 390                                                         attr_usage_id) &&
 391                                         (field->usage[0].collection_index >=
 392                                         hsdev->start_collection_index) &&
 393                                         (field->usage[0].collection_index <
 394                                         hsdev->end_collection_index)) {
 395
 396                                         sensor_hub_fill_attr_info(info, i,
 397                                                                 report->id,
 398                                                                 field);
 399                                         ret = 0;
 400                                         break;
 401                                 }
 402                         }
 403                 }
 404
 405         }
 406
 407         return ret;
 408 }
 409 EXPORT_SYMBOL_GPL(sensor_hub_input_get_attribute_info);
 410
 411 #ifdef CONFIG_PM
 412 static int sensor_hub_suspend(struct hid_device *hdev, pm_message_t message)
 413 {
 414         struct sensor_hub_data *pdata = hid_get_drvdata(hdev);
 415         struct hid_sensor_hub_callbacks_list *callback;
 416         unsigned long flags;
 417
 418         hid_dbg(hdev, " sensor_hub_suspend\n");
 419         spin_lock_irqsave(&pdata->dyn_callback_lock, flags);
 420         list_for_each_entry(callback, &pdata->dyn_callback_list, list) {
 421                 if (callback->usage_callback->suspend)
 422                         callback->usage_callback->suspend(
 423                                         callback->hsdev, callback->priv);
 424         }
 425         spin_unlock_irqrestore(&pdata->dyn_callback_lock, flags);
 426
 427         return 0;
 428 }
 429
 430 static int sensor_hub_resume(struct hid_device *hdev)
 431 {
 432         struct sensor_hub_data *pdata = hid_get_drvdata(hdev);
 433         struct hid_sensor_hub_callbacks_list *callback;
 434         unsigned long flags;
 435
 436         hid_dbg(hdev, " sensor_hub_resume\n");
 437         spin_lock_irqsave(&pdata->dyn_callback_lock, flags);
 438         list_for_each_entry(callback, &pdata->dyn_callback_list, list) {
 439                 if (callback->usage_callback->resume)
 440                         callback->usage_callback->resume(
 441                                         callback->hsdev, callback->priv);
 442         }
 443         spin_unlock_irqrestore(&pdata->dyn_callback_lock, flags);
 444
 445         return 0;
 446 }
 447
 448 static int sensor_hub_reset_resume(struct hid_device *hdev)
 449 {
 450         return 0;
 451 }
 452 #endif
 453
 454 /*
 455  * Handle raw report as sent by device
 456  */
 457 static int sensor_hub_raw_event(struct hid_device *hdev,
 458                 struct hid_report *report, u8 *raw_data, int size)
 459 {
 460         int i;
 461         u8 *ptr;
 462         int sz;
 463         struct sensor_hub_data *pdata = hid_get_drvdata(hdev);
 464         unsigned long flags;
 465         struct hid_sensor_hub_callbacks *callback = NULL;
 466         struct hid_collection *collection = NULL;
 467         void *priv = NULL;
 468         struct hid_sensor_hub_device *hsdev = NULL;
 469
 470         hid_dbg(hdev, "sensor_hub_raw_event report id:0x%x size:%d type:%d\n",
 471                          report->id, size, report->type);
 472         hid_dbg(hdev, "maxfield:%d\n", report->maxfield);
 473         if (report->type != HID_INPUT_REPORT)
 474                 return 1;
 475
 476         ptr = raw_data;
 477         ptr++; /* Skip report id */
 478
 479         spin_lock_irqsave(&pdata->lock, flags);
 480
 481         for (i = 0; i < report->maxfield; ++i) {
 482                 hid_dbg(hdev, "%d collection_index:%x hid:%x sz:%x\n",
 483                                 i, report->field[i]->usage->collection_index,
 484                                 report->field[i]->usage->hid,
 485                                 (report->field[i]->report_size *
 486                                         report->field[i]->report_count)/8);
 487                 sz = (report->field[i]->report_size *
 488                                         report->field[i]->report_count)/8;
 489                 collection = &hdev->collection[
 490                                 report->field[i]->usage->collection_index];
 491                 hid_dbg(hdev, "collection->usage %x\n",
 492                                         collection->usage);
 493
 494                 callback = sensor_hub_get_callback(hdev,
 495                                 report->field[i]->physical,
 496                                 report->field[i]->usage[0].collection_index,
 497                                 &hsdev, &priv);
 498                 if (!callback) {
 499                         ptr += sz;
 500                         continue;
 501                 }
 502                 if (hsdev->pending.status && (hsdev->pending.attr_usage_id ==
 503                                               report->field[i]->usage->hid ||
 504                                               hsdev->pending.attr_usage_id ==
 505                                               report->field[i]->logical)) {
 506                         hid_dbg(hdev, "data was pending ...\n");
 507                         hsdev->pending.raw_data = kmemdup(ptr, sz, GFP_ATOMIC);
 508                         if (hsdev->pending.raw_data)
 509                                 hsdev->pending.raw_size = sz;
 510                         else
 511                                 hsdev->pending.raw_size = 0;
 512                         complete(&hsdev->pending.ready);
 513                 }
 514                 if (callback->capture_sample) {
 515                         if (report->field[i]->logical)
 516                                 callback->capture_sample(hsdev,
 517                                         report->field[i]->logical, sz, ptr,
 518                                         callback->pdev);
 519                         else
 520                                 callback->capture_sample(hsdev,
 521                                         report->field[i]->usage->hid, sz, ptr,
 522                                         callback->pdev);
 523                 }
 524                 ptr += sz;
 525         }
 526         if (callback && collection && callback->send_event)
 527                 callback->send_event(hsdev, collection->usage,
 528                                 callback->pdev);
 529         spin_unlock_irqrestore(&pdata->lock, flags);
 530
 531         return 1;
 532 }
 533
 534 int sensor_hub_device_open(struct hid_sensor_hub_device *hsdev)
 535 {
 536         int ret = 0;
 537         struct sensor_hub_data *data =  hid_get_drvdata(hsdev->hdev);
 538
 539         mutex_lock(&data->mutex);
 540         if (!data->ref_cnt) {
 541                 ret = hid_hw_open(hsdev->hdev);
 542                 if (ret) {
 543                         hid_err(hsdev->hdev, "failed to open hid device\n");
 544                         mutex_unlock(&data->mutex);
 545                         return ret;
 546                 }
 547         }
 548         data->ref_cnt++;
 549         mutex_unlock(&data->mutex);
 550
 551         return ret;
 552 }
 553 EXPORT_SYMBOL_GPL(sensor_hub_device_open);
 554
 555 void sensor_hub_device_close(struct hid_sensor_hub_device *hsdev)
 556 {
 557         struct sensor_hub_data *data =  hid_get_drvdata(hsdev->hdev);
 558
 559         mutex_lock(&data->mutex);
 560         data->ref_cnt--;
 561         if (!data->ref_cnt)
 562                 hid_hw_close(hsdev->hdev);
 563         mutex_unlock(&data->mutex);
 564 }
 565 EXPORT_SYMBOL_GPL(sensor_hub_device_close);
 566
 567 static __u8 *sensor_hub_report_fixup(struct hid_device *hdev, __u8 *rdesc,
 568                 unsigned int *rsize)
 569 {
 570         int index;
 571         struct sensor_hub_data *sd =  hid_get_drvdata(hdev);
 572         unsigned char report_block[] = {
 573                                 0x0a,  0x16, 0x03, 0x15, 0x00, 0x25, 0x05};
 574         unsigned char power_block[] = {
 575                                 0x0a,  0x19, 0x03, 0x15, 0x00, 0x25, 0x05};
 576
 577         if (!(sd->quirks & HID_SENSOR_HUB_ENUM_QUIRK)) {
 578                 hid_dbg(hdev, "No Enum quirks\n");
 579                 return rdesc;
 580         }
 581
 582         /* Looks for power and report state usage id and force to 1 */
 583         for (index = 0; index < *rsize; ++index) {
 584                 if (((*rsize - index) > sizeof(report_block)) &&
 585                         !memcmp(&rdesc[index], report_block,
 586                                                 sizeof(report_block))) {
 587                         rdesc[index + 4] = 0x01;
 588                         index += sizeof(report_block);
 589                 }
 590                 if (((*rsize - index) > sizeof(power_block)) &&
 591                         !memcmp(&rdesc[index], power_block,
 592                                                 sizeof(power_block))) {
 593                         rdesc[index + 4] = 0x01;
 594                         index += sizeof(power_block);
 595                 }
 596         }
 597
 598         /* Checks if the report descriptor of Thinkpad Helix 2 has a logical
 599          * minimum for magnetic flux axis greater than the maximum */
 600         if (hdev->product == USB_DEVICE_ID_TEXAS_INSTRUMENTS_LENOVO_YOGA &&
 601                 *rsize == 2558 && rdesc[913] == 0x17 && rdesc[914] == 0x40 &&
 602                 rdesc[915] == 0x81 && rdesc[916] == 0x08 &&
 603                 rdesc[917] == 0x00 && rdesc[918] == 0x27 &&
 604                 rdesc[921] == 0x07 && rdesc[922] == 0x00) {
 605                 /* Sets negative logical minimum for mag x, y and z */
 606                 rdesc[914] = rdesc[935] = rdesc[956] = 0xc0;
 607                 rdesc[915] = rdesc[936] = rdesc[957] = 0x7e;
 608                 rdesc[916] = rdesc[937] = rdesc[958] = 0xf7;
 609                 rdesc[917] = rdesc[938] = rdesc[959] = 0xff;
 610         }
 611
 612         return rdesc;
 613 }
 614
 615 static int sensor_hub_probe(struct hid_device *hdev,
 616                                 const struct hid_device_id *id)
 617 {
 618         int ret;
 619         struct sensor_hub_data *sd;
 620         int i;
 621         char *name;
 622         int dev_cnt;
 623         struct hid_sensor_hub_device *hsdev;
 624         struct hid_sensor_hub_device *last_hsdev = NULL;
 625         struct hid_sensor_hub_device *collection_hsdev = NULL;
 626
 627         sd = devm_kzalloc(&hdev->dev, sizeof(*sd), GFP_KERNEL);
 628         if (!sd) {
 629                 hid_err(hdev, "cannot allocate Sensor data\n");
 630                 return -ENOMEM;
 631         }
 632
 633         hid_set_drvdata(hdev, sd);
 634         sd->quirks = id->driver_data;
 635
 636         spin_lock_init(&sd->lock);
 637         spin_lock_init(&sd->dyn_callback_lock);
 638         mutex_init(&sd->mutex);
 639         ret = hid_parse(hdev);
 640         if (ret) {
 641                 hid_err(hdev, "parse failed\n");
 642                 return ret;
 643         }
 644         INIT_LIST_HEAD(&hdev->inputs);
 645
 646         ret = hid_hw_start(hdev, 0);
 647         if (ret) {
 648                 hid_err(hdev, "hw start failed\n");
 649                 return ret;
 650         }
 651         INIT_LIST_HEAD(&sd->dyn_callback_list);
 652         sd->hid_sensor_client_cnt = 0;
 653
 654         dev_cnt = sensor_hub_get_physical_device_count(hdev);
 655         if (dev_cnt > HID_MAX_PHY_DEVICES) {
 656                 hid_err(hdev, "Invalid Physical device count\n");
 657                 ret = -EINVAL;
 658                 goto err_stop_hw;
 659         }
 660         sd->hid_sensor_hub_client_devs = devm_kzalloc(&hdev->dev, dev_cnt *
 661                                                       sizeof(struct mfd_cell),
 662                                                       GFP_KERNEL);
 663         if (sd->hid_sensor_hub_client_devs == NULL) {
 664                 hid_err(hdev, "Failed to allocate memory for mfd cells\n");
 665                 ret = -ENOMEM;
 666                 goto err_stop_hw;
 667         }
 668
 669         for (i = 0; i < hdev->maxcollection; ++i) {
 670                 struct hid_collection *collection = &hdev->collection[i];
 671
 672                 if (collection->type == HID_COLLECTION_PHYSICAL ||
 673                     collection->type == HID_COLLECTION_APPLICATION) {
 674
 675                         hsdev = devm_kzalloc(&hdev->dev, sizeof(*hsdev),
 676                                              GFP_KERNEL);
 677                         if (!hsdev) {
 678                                 hid_err(hdev, "cannot allocate hid_sensor_hub_device\n");
 679                                 ret = -ENOMEM;
 680                                 goto err_stop_hw;
 681                         }
 682                         hsdev->hdev = hdev;
 683                         hsdev->vendor_id = hdev->vendor;
 684                         hsdev->product_id = hdev->product;
 685                         hsdev->usage = collection->usage;
 686                         hsdev->mutex_ptr = devm_kzalloc(&hdev->dev,
 687                                                         sizeof(struct mutex),
 688                                                         GFP_KERNEL);
 689                         if (!hsdev->mutex_ptr) {
 690                                 ret = -ENOMEM;
 691                                 goto err_stop_hw;
 692                         }
 693                         mutex_init(hsdev->mutex_ptr);
 694                         hsdev->start_collection_index = i;
 695                         if (last_hsdev)
 696                                 last_hsdev->end_collection_index = i;
 697                         last_hsdev = hsdev;
 698                         name = devm_kasprintf(&hdev->dev, GFP_KERNEL,
 699                                               "HID-SENSOR-%x",
 700                                               collection->usage);
 701                         if (name == NULL) {
 702                                 hid_err(hdev, "Failed MFD device name\n");
 703                                 ret = -ENOMEM;
 704                                 goto err_stop_hw;
 705                         }
 706                         sd->hid_sensor_hub_client_devs[
 707                                 sd->hid_sensor_client_cnt].name = name;
 708                         sd->hid_sensor_hub_client_devs[
 709                                 sd->hid_sensor_client_cnt].platform_data =
 710                                                         hsdev;
 711                         sd->hid_sensor_hub_client_devs[
 712                                 sd->hid_sensor_client_cnt].pdata_size =
 713                                                         sizeof(*hsdev);
 714                         hid_dbg(hdev, "Adding %s:%d\n", name,
 715                                         hsdev->start_collection_index);
 716                         sd->hid_sensor_client_cnt++;
 717                         if (collection_hsdev)
 718                                 collection_hsdev->end_collection_index = i;
 719                         if (collection->type == HID_COLLECTION_APPLICATION &&
 720                             collection->usage == HID_USAGE_SENSOR_COLLECTION)
 721                                 collection_hsdev = hsdev;
 722                 }
 723         }
 724         if (last_hsdev)
 725                 last_hsdev->end_collection_index = i;
 726         if (collection_hsdev)
 727                 collection_hsdev->end_collection_index = i;
 728
 729         ret = mfd_add_hotplug_devices(&hdev->dev,
 730                         sd->hid_sensor_hub_client_devs,
 731                         sd->hid_sensor_client_cnt);
 732         if (ret < 0)
 733                 goto err_stop_hw;
 734
 735         return ret;
 736
 737 err_stop_hw:
 738         hid_hw_stop(hdev);
 739
 740         return ret;
 741 }
 742
 743 static void sensor_hub_remove(struct hid_device *hdev)
 744 {
 745         struct sensor_hub_data *data = hid_get_drvdata(hdev);
 746         unsigned long flags;
 747         int i;
 748
 749         hid_dbg(hdev, " hardware removed\n");
 750         hid_hw_close(hdev);
 751         hid_hw_stop(hdev);
 752         spin_lock_irqsave(&data->lock, flags);
 753         for (i = 0; i < data->hid_sensor_client_cnt; ++i) {
 754                 struct hid_sensor_hub_device *hsdev =
 755                         data->hid_sensor_hub_client_devs[i].platform_data;
 756                 if (hsdev->pending.status)
 757                         complete(&hsdev->pending.ready);
 758         }
 759         spin_unlock_irqrestore(&data->lock, flags);
 760         mfd_remove_devices(&hdev->dev);
 761         hid_set_drvdata(hdev, NULL);
 762         mutex_destroy(&data->mutex);
 763 }
 764
 765 static const struct hid_device_id sensor_hub_devices[] = {
 766         { HID_DEVICE(HID_BUS_ANY, HID_GROUP_SENSOR_HUB, USB_VENDOR_ID_INTEL_0,
 767                         USB_DEVICE_ID_INTEL_HID_SENSOR_0),
 768                         .driver_data = HID_SENSOR_HUB_ENUM_QUIRK},
 769         { HID_DEVICE(HID_BUS_ANY, HID_GROUP_SENSOR_HUB, USB_VENDOR_ID_INTEL_1,
 770                         USB_DEVICE_ID_INTEL_HID_SENSOR_0),
 771                         .driver_data = HID_SENSOR_HUB_ENUM_QUIRK},
 772         { HID_DEVICE(HID_BUS_ANY, HID_GROUP_SENSOR_HUB, USB_VENDOR_ID_INTEL_1,
 773                         USB_DEVICE_ID_INTEL_HID_SENSOR_1),
 774                         .driver_data = HID_SENSOR_HUB_ENUM_QUIRK},
 775         { HID_DEVICE(HID_BUS_ANY, HID_GROUP_SENSOR_HUB, USB_VENDOR_ID_MICROSOFT,
 776                         USB_DEVICE_ID_MS_SURFACE_PRO_2),
 777                         .driver_data = HID_SENSOR_HUB_ENUM_QUIRK},
 778         { HID_DEVICE(HID_BUS_ANY, HID_GROUP_SENSOR_HUB, USB_VENDOR_ID_MICROSOFT,
 779                         USB_DEVICE_ID_MS_TOUCH_COVER_2),
 780                         .driver_data = HID_SENSOR_HUB_ENUM_QUIRK},
 781         { HID_DEVICE(HID_BUS_ANY, HID_GROUP_SENSOR_HUB, USB_VENDOR_ID_MICROSOFT,
 782                         USB_DEVICE_ID_MS_TYPE_COVER_2),
 783                         .driver_data = HID_SENSOR_HUB_ENUM_QUIRK},
 784         { HID_DEVICE(HID_BUS_ANY, HID_GROUP_SENSOR_HUB, USB_VENDOR_ID_STM_0,
 785                         USB_DEVICE_ID_STM_HID_SENSOR),
 786                         .driver_data = HID_SENSOR_HUB_ENUM_QUIRK},
 787         { HID_DEVICE(HID_BUS_ANY, HID_GROUP_SENSOR_HUB, USB_VENDOR_ID_STM_0,
 788                         USB_DEVICE_ID_STM_HID_SENSOR_1),
 789                         .driver_data = HID_SENSOR_HUB_ENUM_QUIRK},
 790         { HID_DEVICE(HID_BUS_ANY, HID_GROUP_SENSOR_HUB, USB_VENDOR_ID_TEXAS_INSTRUMENTS,
 791                         USB_DEVICE_ID_TEXAS_INSTRUMENTS_LENOVO_YOGA),
 792                         .driver_data = HID_SENSOR_HUB_ENUM_QUIRK},
 793         { HID_DEVICE(HID_BUS_ANY, HID_GROUP_SENSOR_HUB, USB_VENDOR_ID_ITE,
 794                         USB_DEVICE_ID_ITE_LENOVO_YOGA),
 795                         .driver_data = HID_SENSOR_HUB_ENUM_QUIRK},
 796         { HID_DEVICE(HID_BUS_ANY, HID_GROUP_SENSOR_HUB, USB_VENDOR_ID_ITE,
 797                         USB_DEVICE_ID_ITE_LENOVO_YOGA2),
 798                         .driver_data = HID_SENSOR_HUB_ENUM_QUIRK},
 799         { HID_DEVICE(HID_BUS_ANY, HID_GROUP_SENSOR_HUB, USB_VENDOR_ID_ITE,
 800                         USB_DEVICE_ID_ITE_LENOVO_YOGA900),
 801                         .driver_data = HID_SENSOR_HUB_ENUM_QUIRK},
 802         { HID_DEVICE(HID_BUS_ANY, HID_GROUP_SENSOR_HUB, USB_VENDOR_ID_INTEL_0,
 803                         0x22D8),
 804                         .driver_data = HID_SENSOR_HUB_ENUM_QUIRK},
 805         { HID_DEVICE(HID_BUS_ANY, HID_GROUP_SENSOR_HUB, HID_ANY_ID,
 806                      HID_ANY_ID) },
 807         { }
 808 };
 809 MODULE_DEVICE_TABLE(hid, sensor_hub_devices);
 810
 811 static struct hid_driver sensor_hub_driver = {
 812         .name = "hid-sensor-hub",
 813         .id_table = sensor_hub_devices,
 814         .probe = sensor_hub_probe,
 815         .remove = sensor_hub_remove,
 816         .raw_event = sensor_hub_raw_event,
 817         .report_fixup = sensor_hub_report_fixup,
 818 #ifdef CONFIG_PM
 819         .suspend = sensor_hub_suspend,
 820         .resume = sensor_hub_resume,
 821         .reset_resume = sensor_hub_reset_resume,
 822 #endif
 823 };
 824 module_hid_driver(sensor_hub_driver);
 825
 826 MODULE_DESCRIPTION("HID Sensor Hub driver");
 827 MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@intel.com>");
 828 MODULE_LICENSE("GPL");