drivers/hid/hid-sensor-hub.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * HID Sensors Driver
   4  * Copyright (c) 2012, Intel Corporation.
   5  */
   6
   7 #include <linux/device.h>
   8 #include <linux/hid.h>
   9 #include <linux/module.h>
  10 #include <linux/slab.h>
  11 #include <linux/mfd/core.h>
  12 #include <linux/list.h>
  13 #include <linux/hid-sensor-ids.h>
  14 #include <linux/hid-sensor-hub.h>
  15 #include "hid-ids.h"
  16
  17 #define HID_SENSOR_HUB_ENUM_QUIRK       0x01
  18
  19 /**
  20  * struct sensor_hub_data - Hold a instance data for a HID hub device
  21  * @hsdev:              Stored hid instance for current hub device.
  22  * @mutex:              Mutex to serialize synchronous request.
  23  * @lock:               Spin lock to protect pending request structure.
  24  * @dyn_callback_list:  Holds callback function
  25  * @dyn_callback_lock:  spin lock to protect callback list
  26  * @hid_sensor_hub_client_devs: Stores all MFD cells for a hub instance.
  27  * @hid_sensor_client_cnt: Number of MFD cells, (no of sensors attached).
  28  * @ref_cnt:            Number of MFD clients have opened this device
  29  */
  30 struct sensor_hub_data {
  31         struct mutex mutex;
  32         spinlock_t lock;
  33         struct list_head dyn_callback_list;
  34         spinlock_t dyn_callback_lock;
  35         struct mfd_cell *hid_sensor_hub_client_devs;
  36         int hid_sensor_client_cnt;
  37         unsigned long quirks;
  38         int ref_cnt;
  39 };
  40
  41 /**
  42  * struct hid_sensor_hub_callbacks_list - Stores callback list
  43  * @list:               list head.
  44  * @usage_id:           usage id for a physical device.
  45  * @usage_callback:     Stores registered callback functions.
  46  * @priv:               Private data for a physical device.
  47  */
  48 struct hid_sensor_hub_callbacks_list {
  49         struct list_head list;
  50         u32 usage_id;
  51         struct hid_sensor_hub_device *hsdev;
  52         struct hid_sensor_hub_callbacks *usage_callback;
  53         void *priv;
  54 };
  55
  56 static struct hid_report *sensor_hub_report(int id, struct hid_device *hdev,
  57                                                 int dir)
  58 {
  59         struct hid_report *report;
  60
  61         list_for_each_entry(report, &hdev->report_enum[dir].report_list, list) {
  62                 if (report->id == id)
  63                         return report;
  64         }
  65         hid_warn(hdev, "No report with id 0x%x found\n", id);
  66
  67         return NULL;
  68 }
  69
  70 static int sensor_hub_get_physical_device_count(struct hid_device *hdev)
  71 {
  72         int i;
  73         int count = 0;
  74
  75         for (i = 0; i < hdev->maxcollection; ++i) {
  76                 struct hid_collection *collection = &hdev->collection[i];
  77                 if (collection->type == HID_COLLECTION_PHYSICAL ||
  78                     collection->type == HID_COLLECTION_APPLICATION)
  79                         ++count;
  80         }
  81
  82         return count;
  83 }
  84
  85 static void sensor_hub_fill_attr_info(
  86                 struct hid_sensor_hub_attribute_info *info,
  87                 s32 index, s32 report_id, struct hid_field *field)
  88 {
  89         info->index = index;
  90         info->report_id = report_id;
  91         info->units = field->unit;
  92         info->unit_expo = field->unit_exponent;
  93         info->size = (field->report_size * field->report_count)/8;
  94         info->logical_minimum = field->logical_minimum;
  95         info->logical_maximum = field->logical_maximum;
  96 }
  97
  98 static struct hid_sensor_hub_callbacks *sensor_hub_get_callback(
  99                                         struct hid_device *hdev,
 100                                         u32 usage_id,
 101                                         int collection_index,
 102                                         struct hid_sensor_hub_device **hsdev,
 103                                         void **priv)
 104 {
 105         struct hid_sensor_hub_callbacks_list *callback;
 106         struct sensor_hub_data *pdata = hid_get_drvdata(hdev);
 107         unsigned long flags;
 108
 109         spin_lock_irqsave(&pdata->dyn_callback_lock, flags);
 110         list_for_each_entry(callback, &pdata->dyn_callback_list, list)
 111                 if ((callback->usage_id == usage_id ||
 112                      callback->usage_id == HID_USAGE_SENSOR_COLLECTION) &&
 113                         (collection_index >=
 114                                 callback->hsdev->start_collection_index) &&
 115                         (collection_index <
 116                                 callback->hsdev->end_collection_index)) {
 117                         *priv = callback->priv;
 118                         *hsdev = callback->hsdev;
 119                         spin_unlock_irqrestore(&pdata->dyn_callback_lock,
 120                                                flags);
 121                         return callback->usage_callback;
 122                 }
 123         spin_unlock_irqrestore(&pdata->dyn_callback_lock, flags);
 124
 125         return NULL;
 126 }
 127
 128 int sensor_hub_register_callback(struct hid_sensor_hub_device *hsdev,
 129                         u32 usage_id,
 130                         struct hid_sensor_hub_callbacks *usage_callback)
 131 {
 132         struct hid_sensor_hub_callbacks_list *callback;
 133         struct sensor_hub_data *pdata = hid_get_drvdata(hsdev->hdev);
 134         unsigned long flags;
 135
 136         spin_lock_irqsave(&pdata->dyn_callback_lock, flags);
 137         list_for_each_entry(callback, &pdata->dyn_callback_list, list)
 138                 if (callback->usage_id == usage_id &&
 139                                                 callback->hsdev == hsdev) {
 140                         spin_unlock_irqrestore(&pdata->dyn_callback_lock, flags);
 141                         return -EINVAL;
 142                 }
 143         callback = kzalloc(sizeof(*callback), GFP_ATOMIC);
 144         if (!callback) {
 145                 spin_unlock_irqrestore(&pdata->dyn_callback_lock, flags);
 146                 return -ENOMEM;
 147         }
 148         callback->hsdev = hsdev;
 149         callback->usage_callback = usage_callback;
 150         callback->usage_id = usage_id;
 151         callback->priv = NULL;
 152         /*
 153          * If there is a handler registered for the collection type, then
 154          * it will handle all reports for sensors in this collection. If
 155          * there is also an individual sensor handler registration, then
 156          * we want to make sure that the reports are directed to collection
 157          * handler, as this may be a fusion sensor. So add collection handlers
 158          * to the beginning of the list, so that they are matched first.
 159          */
 160         if (usage_id == HID_USAGE_SENSOR_COLLECTION)
 161                 list_add(&callback->list, &pdata->dyn_callback_list);
 162         else
 163                 list_add_tail(&callback->list, &pdata->dyn_callback_list);
 164         spin_unlock_irqrestore(&pdata->dyn_callback_lock, flags);
 165
 166         return 0;
 167 }
 168 EXPORT_SYMBOL_GPL(sensor_hub_register_callback);
 169
 170 int sensor_hub_remove_callback(struct hid_sensor_hub_device *hsdev,
 171                                 u32 usage_id)
 172 {
 173         struct hid_sensor_hub_callbacks_list *callback;
 174         struct sensor_hub_data *pdata = hid_get_drvdata(hsdev->hdev);
 175         unsigned long flags;
 176
 177         spin_lock_irqsave(&pdata->dyn_callback_lock, flags);
 178         list_for_each_entry(callback, &pdata->dyn_callback_list, list)
 179                 if (callback->usage_id == usage_id &&
 180                                                 callback->hsdev == hsdev) {
 181                         list_del(&callback->list);
 182                         kfree(callback);
 183                         break;
 184                 }
 185         spin_unlock_irqrestore(&pdata->dyn_callback_lock, flags);
 186
 187         return 0;
 188 }
 189 EXPORT_SYMBOL_GPL(sensor_hub_remove_callback);
 190
 191 int sensor_hub_set_feature(struct hid_sensor_hub_device *hsdev, u32 report_id,
 192                            u32 field_index, int buffer_size, void *buffer)
 193 {
 194         struct hid_report *report;
 195         struct sensor_hub_data *data = hid_get_drvdata(hsdev->hdev);
 196         __s32 *buf32 = buffer;
 197         int i = 0;
 198         int remaining_bytes;
 199         __s32 value;
 200         int ret = 0;
 201
 202         mutex_lock(&data->mutex);
 203         report = sensor_hub_report(report_id, hsdev->hdev, HID_FEATURE_REPORT);
 204         if (!report || (field_index >= report->maxfield)) {
 205                 ret = -EINVAL;
 206                 goto done_proc;
 207         }
 208
 209         remaining_bytes = buffer_size % sizeof(__s32);
 210         buffer_size = buffer_size / sizeof(__s32);
 211         if (buffer_size) {
 212                 for (i = 0; i < buffer_size; ++i) {
 213                         hid_set_field(report->field[field_index], i,
 214                                       (__force __s32)cpu_to_le32(*buf32));
 215                         ++buf32;
 216                 }
 217         }
 218         if (remaining_bytes) {
 219                 value = 0;
 220                 memcpy(&value, (u8 *)buf32, remaining_bytes);
 221                 hid_set_field(report->field[field_index], i,
 222                               (__force __s32)cpu_to_le32(value));
 223         }
 224         hid_hw_request(hsdev->hdev, report, HID_REQ_SET_REPORT);
 225         hid_hw_wait(hsdev->hdev);
 226
 227 done_proc:
 228         mutex_unlock(&data->mutex);
 229
 230         return ret;
 231 }
 232 EXPORT_SYMBOL_GPL(sensor_hub_set_feature);
 233
 234 int sensor_hub_get_feature(struct hid_sensor_hub_device *hsdev, u32 report_id,
 235                            u32 field_index, int buffer_size, void *buffer)
 236 {
 237         struct hid_report *report;
 238         struct sensor_hub_data *data = hid_get_drvdata(hsdev->hdev);
 239         int report_size;
 240         int ret = 0;
 241         u8 *val_ptr;
 242         int buffer_index = 0;
 243         int i;
 244
 245         memset(buffer, 0, buffer_size);
 246
 247         mutex_lock(&data->mutex);
 248         report = sensor_hub_report(report_id, hsdev->hdev, HID_FEATURE_REPORT);
 249         if (!report || (field_index >= report->maxfield) ||
 250             report->field[field_index]->report_count < 1) {
 251                 ret = -EINVAL;
 252                 goto done_proc;
 253         }
 254         hid_hw_request(hsdev->hdev, report, HID_REQ_GET_REPORT);
 255         hid_hw_wait(hsdev->hdev);
 256
 257         /* calculate number of bytes required to read this field */
 258         report_size = DIV_ROUND_UP(report->field[field_index]->report_size,
 259                                    8) *
 260                                    report->field[field_index]->report_count;
 261         if (!report_size) {
 262                 ret = -EINVAL;
 263                 goto done_proc;
 264         }
 265         ret = min(report_size, buffer_size);
 266
 267         val_ptr = (u8 *)report->field[field_index]->value;
 268         for (i = 0; i < report->field[field_index]->report_count; ++i) {
 269                 if (buffer_index >= ret)
 270                         break;
 271
 272                 memcpy(&((u8 *)buffer)[buffer_index], val_ptr,
 273                        report->field[field_index]->report_size / 8);
 274                 val_ptr += sizeof(__s32);
 275                 buffer_index += (report->field[field_index]->report_size / 8);
 276         }
 277
 278 done_proc:
 279         mutex_unlock(&data->mutex);
 280
 281         return ret;
 282 }
 283 EXPORT_SYMBOL_GPL(sensor_hub_get_feature);
 284
 285
 286 int sensor_hub_input_attr_get_raw_value(struct hid_sensor_hub_device *hsdev,
 287                                         u32 usage_id,
 288                                         u32 attr_usage_id, u32 report_id,
 289                                         enum sensor_hub_read_flags flag,
 290                                         bool is_signed)
 291 {
 292         struct sensor_hub_data *data = hid_get_drvdata(hsdev->hdev);
 293         unsigned long flags;
 294         struct hid_report *report;
 295         int ret_val = 0;
 296
 297         report = sensor_hub_report(report_id, hsdev->hdev,
 298                                    HID_INPUT_REPORT);
 299         if (!report)
 300                 return -EINVAL;
 301
 302         mutex_lock(hsdev->mutex_ptr);
 303         if (flag == SENSOR_HUB_SYNC) {
 304                 memset(&hsdev->pending, 0, sizeof(hsdev->pending));
 305                 init_completion(&hsdev->pending.ready);
 306                 hsdev->pending.usage_id = usage_id;
 307                 hsdev->pending.attr_usage_id = attr_usage_id;
 308                 hsdev->pending.raw_size = 0;
 309
 310                 spin_lock_irqsave(&data->lock, flags);
 311                 hsdev->pending.status = true;
 312                 spin_unlock_irqrestore(&data->lock, flags);
 313         }
 314         mutex_lock(&data->mutex);
 315         hid_hw_request(hsdev->hdev, report, HID_REQ_GET_REPORT);
 316         mutex_unlock(&data->mutex);
 317         if (flag == SENSOR_HUB_SYNC) {
 318                 wait_for_completion_interruptible_timeout(
 319                                                 &hsdev->pending.ready, HZ*5);
 320                 switch (hsdev->pending.raw_size) {
 321                 case 1:
 322                         if (is_signed)
 323                                 ret_val = *(s8 *)hsdev->pending.raw_data;
 324                         else
 325                                 ret_val = *(u8 *)hsdev->pending.raw_data;
 326                         break;
 327                 case 2:
 328                         if (is_signed)
 329                                 ret_val = *(s16 *)hsdev->pending.raw_data;
 330                         else
 331                                 ret_val = *(u16 *)hsdev->pending.raw_data;
 332                         break;
 333                 case 4:
 334                         ret_val = *(u32 *)hsdev->pending.raw_data;
 335                         break;
 336                 default:
 337                         ret_val = 0;
 338                 }
 339                 kfree(hsdev->pending.raw_data);
 340                 hsdev->pending.status = false;
 341         }
 342         mutex_unlock(hsdev->mutex_ptr);
 343
 344         return ret_val;
 345 }
 346 EXPORT_SYMBOL_GPL(sensor_hub_input_attr_get_raw_value);
 347
 348 int hid_sensor_get_usage_index(struct hid_sensor_hub_device *hsdev,
 349                                 u32 report_id, int field_index, u32 usage_id)
 350 {
 351         struct hid_report *report;
 352         struct hid_field *field;
 353         int i;
 354
 355         report = sensor_hub_report(report_id, hsdev->hdev, HID_FEATURE_REPORT);
 356         if (!report || (field_index >= report->maxfield))
 357                 goto done_proc;
 358
 359         field = report->field[field_index];
 360         for (i = 0; i < field->maxusage; ++i) {
 361                 if (field->usage[i].hid == usage_id)
 362                         return field->usage[i].usage_index;
 363         }
 364
 365 done_proc:
 366         return -EINVAL;
 367 }
 368 EXPORT_SYMBOL_GPL(hid_sensor_get_usage_index);
 369
 370 int sensor_hub_input_get_attribute_info(struct hid_sensor_hub_device *hsdev,
 371                                 u8 type,
 372                                 u32 usage_id,
 373                                 u32 attr_usage_id,
 374                                 struct hid_sensor_hub_attribute_info *info)
 375 {
 376         int ret = -1;
 377         int i;
 378         struct hid_report *report;
 379         struct hid_field *field;
 380         struct hid_report_enum *report_enum;
 381         struct hid_device *hdev = hsdev->hdev;
 382
 383         /* Initialize with defaults */
 384         info->usage_id = usage_id;
 385         info->attrib_id = attr_usage_id;
 386         info->report_id = -1;
 387         info->index = -1;
 388         info->units = -1;
 389         info->unit_expo = -1;
 390
 391         report_enum = &hdev->report_enum[type];
 392         list_for_each_entry(report, &report_enum->report_list, list) {
 393                 for (i = 0; i < report->maxfield; ++i) {
 394                         field = report->field[i];
 395                         if (field->maxusage) {
 396                                 if (field->physical == usage_id &&
 397                                         (field->logical == attr_usage_id ||
 398                                         field->usage[0].hid ==
 399                                                         attr_usage_id) &&
 400                                         (field->usage[0].collection_index >=
 401                                         hsdev->start_collection_index) &&
 402                                         (field->usage[0].collection_index <
 403                                         hsdev->end_collection_index)) {
 404
 405                                         sensor_hub_fill_attr_info(info, i,
 406                                                                 report->id,
 407                                                                 field);
 408                                         ret = 0;
 409                                         break;
 410                                 }
 411                         }
 412                 }
 413
 414         }
 415
 416         return ret;
 417 }
 418 EXPORT_SYMBOL_GPL(sensor_hub_input_get_attribute_info);
 419
 420 #ifdef CONFIG_PM
 421 static int sensor_hub_suspend(struct hid_device *hdev, pm_message_t message)
 422 {
 423         struct sensor_hub_data *pdata = hid_get_drvdata(hdev);
 424         struct hid_sensor_hub_callbacks_list *callback;
 425         unsigned long flags;
 426
 427         hid_dbg(hdev, " sensor_hub_suspend\n");
 428         spin_lock_irqsave(&pdata->dyn_callback_lock, flags);
 429         list_for_each_entry(callback, &pdata->dyn_callback_list, list) {
 430                 if (callback->usage_callback->suspend)
 431                         callback->usage_callback->suspend(
 432                                         callback->hsdev, callback->priv);
 433         }
 434         spin_unlock_irqrestore(&pdata->dyn_callback_lock, flags);
 435
 436         return 0;
 437 }
 438
 439 static int sensor_hub_resume(struct hid_device *hdev)
 440 {
 441         struct sensor_hub_data *pdata = hid_get_drvdata(hdev);
 442         struct hid_sensor_hub_callbacks_list *callback;
 443         unsigned long flags;
 444
 445         hid_dbg(hdev, " sensor_hub_resume\n");
 446         spin_lock_irqsave(&pdata->dyn_callback_lock, flags);
 447         list_for_each_entry(callback, &pdata->dyn_callback_list, list) {
 448                 if (callback->usage_callback->resume)
 449                         callback->usage_callback->resume(
 450                                         callback->hsdev, callback->priv);
 451         }
 452         spin_unlock_irqrestore(&pdata->dyn_callback_lock, flags);
 453
 454         return 0;
 455 }
 456
 457 static int sensor_hub_reset_resume(struct hid_device *hdev)
 458 {
 459         return 0;
 460 }
 461 #endif
 462
 463 /*
 464  * Handle raw report as sent by device
 465  */
 466 static int sensor_hub_raw_event(struct hid_device *hdev,
 467                 struct hid_report *report, u8 *raw_data, int size)
 468 {
 469         int i;
 470         u8 *ptr;
 471         int sz;
 472         struct sensor_hub_data *pdata = hid_get_drvdata(hdev);
 473         unsigned long flags;
 474         struct hid_sensor_hub_callbacks *callback = NULL;
 475         struct hid_collection *collection = NULL;
 476         void *priv = NULL;
 477         struct hid_sensor_hub_device *hsdev = NULL;
 478
 479         hid_dbg(hdev, "sensor_hub_raw_event report id:0x%x size:%d type:%d\n",
 480                          report->id, size, report->type);
 481         hid_dbg(hdev, "maxfield:%d\n", report->maxfield);
 482         if (report->type != HID_INPUT_REPORT)
 483                 return 1;
 484
 485         ptr = raw_data;
 486         if (report->id)
 487                 ptr++; /* Skip report id */
 488
 489         spin_lock_irqsave(&pdata->lock, flags);
 490
 491         for (i = 0; i < report->maxfield; ++i) {
 492                 hid_dbg(hdev, "%d collection_index:%x hid:%x sz:%x\n",
 493                                 i, report->field[i]->usage->collection_index,
 494                                 report->field[i]->usage->hid,
 495                                 (report->field[i]->report_size *
 496                                         report->field[i]->report_count)/8);
 497                 sz = (report->field[i]->report_size *
 498                                         report->field[i]->report_count)/8;
 499                 collection = &hdev->collection[
 500                                 report->field[i]->usage->collection_index];
 501                 hid_dbg(hdev, "collection->usage %x\n",
 502                                         collection->usage);
 503
 504                 callback = sensor_hub_get_callback(hdev,
 505                                 report->field[i]->physical,
 506                                 report->field[i]->usage[0].collection_index,
 507                                 &hsdev, &priv);
 508                 if (!callback) {
 509                         ptr += sz;
 510                         continue;
 511                 }
 512                 if (hsdev->pending.status && (hsdev->pending.attr_usage_id ==
 513                                               report->field[i]->usage->hid ||
 514                                               hsdev->pending.attr_usage_id ==
 515                                               report->field[i]->logical)) {
 516                         hid_dbg(hdev, "data was pending ...\n");
 517                         hsdev->pending.raw_data = kmemdup(ptr, sz, GFP_ATOMIC);
 518                         if (hsdev->pending.raw_data)
 519                                 hsdev->pending.raw_size = sz;
 520                         else
 521                                 hsdev->pending.raw_size = 0;
 522                         complete(&hsdev->pending.ready);
 523                 }
 524                 if (callback->capture_sample) {
 525                         if (report->field[i]->logical)
 526                                 callback->capture_sample(hsdev,
 527                                         report->field[i]->logical, sz, ptr,
 528                                         callback->pdev);
 529                         else
 530                                 callback->capture_sample(hsdev,
 531                                         report->field[i]->usage->hid, sz, ptr,
 532                                         callback->pdev);
 533                 }
 534                 ptr += sz;
 535         }
 536         if (callback && collection && callback->send_event)
 537                 callback->send_event(hsdev, collection->usage,
 538                                 callback->pdev);
 539         spin_unlock_irqrestore(&pdata->lock, flags);
 540
 541         return 1;
 542 }
 543
 544 int sensor_hub_device_open(struct hid_sensor_hub_device *hsdev)
 545 {
 546         int ret = 0;
 547         struct sensor_hub_data *data =  hid_get_drvdata(hsdev->hdev);
 548
 549         mutex_lock(&data->mutex);
 550         if (!data->ref_cnt) {
 551                 ret = hid_hw_open(hsdev->hdev);
 552                 if (ret) {
 553                         hid_err(hsdev->hdev, "failed to open hid device\n");
 554                         mutex_unlock(&data->mutex);
 555                         return ret;
 556                 }
 557         }
 558         data->ref_cnt++;
 559         mutex_unlock(&data->mutex);
 560
 561         return ret;
 562 }
 563 EXPORT_SYMBOL_GPL(sensor_hub_device_open);
 564
 565 void sensor_hub_device_close(struct hid_sensor_hub_device *hsdev)
 566 {
 567         struct sensor_hub_data *data =  hid_get_drvdata(hsdev->hdev);
 568
 569         mutex_lock(&data->mutex);
 570         data->ref_cnt--;
 571         if (!data->ref_cnt)
 572                 hid_hw_close(hsdev->hdev);
 573         mutex_unlock(&data->mutex);
 574 }
 575 EXPORT_SYMBOL_GPL(sensor_hub_device_close);
 576
 577 static __u8 *sensor_hub_report_fixup(struct hid_device *hdev, __u8 *rdesc,
 578                 unsigned int *rsize)
 579 {
 580         /*
 581          * Checks if the report descriptor of Thinkpad Helix 2 has a logical
 582          * minimum for magnetic flux axis greater than the maximum.
 583          */
 584         if (hdev->product == USB_DEVICE_ID_TEXAS_INSTRUMENTS_LENOVO_YOGA &&
 585                 *rsize == 2558 && rdesc[913] == 0x17 && rdesc[914] == 0x40 &&
 586                 rdesc[915] == 0x81 && rdesc[916] == 0x08 &&
 587                 rdesc[917] == 0x00 && rdesc[918] == 0x27 &&
 588                 rdesc[921] == 0x07 && rdesc[922] == 0x00) {
 589                 /* Sets negative logical minimum for mag x, y and z */
 590                 rdesc[914] = rdesc[935] = rdesc[956] = 0xc0;
 591                 rdesc[915] = rdesc[936] = rdesc[957] = 0x7e;
 592                 rdesc[916] = rdesc[937] = rdesc[958] = 0xf7;
 593                 rdesc[917] = rdesc[938] = rdesc[959] = 0xff;
 594         }
 595
 596         return rdesc;
 597 }
 598
 599 static int sensor_hub_probe(struct hid_device *hdev,
 600                                 const struct hid_device_id *id)
 601 {
 602         int ret;
 603         struct sensor_hub_data *sd;
 604         int i;
 605         char *name;
 606         int dev_cnt;
 607         struct hid_sensor_hub_device *hsdev;
 608         struct hid_sensor_hub_device *last_hsdev = NULL;
 609         struct hid_sensor_hub_device *collection_hsdev = NULL;
 610
 611         sd = devm_kzalloc(&hdev->dev, sizeof(*sd), GFP_KERNEL);
 612         if (!sd) {
 613                 hid_err(hdev, "cannot allocate Sensor data\n");
 614                 return -ENOMEM;
 615         }
 616
 617         hid_set_drvdata(hdev, sd);
 618         sd->quirks = id->driver_data;
 619
 620         spin_lock_init(&sd->lock);
 621         spin_lock_init(&sd->dyn_callback_lock);
 622         mutex_init(&sd->mutex);
 623         ret = hid_parse(hdev);
 624         if (ret) {
 625                 hid_err(hdev, "parse failed\n");
 626                 return ret;
 627         }
 628         INIT_LIST_HEAD(&hdev->inputs);
 629
 630         ret = hid_hw_start(hdev, 0);
 631         if (ret) {
 632                 hid_err(hdev, "hw start failed\n");
 633                 return ret;
 634         }
 635         INIT_LIST_HEAD(&sd->dyn_callback_list);
 636         sd->hid_sensor_client_cnt = 0;
 637
 638         dev_cnt = sensor_hub_get_physical_device_count(hdev);
 639         if (dev_cnt > HID_MAX_PHY_DEVICES) {
 640                 hid_err(hdev, "Invalid Physical device count\n");
 641                 ret = -EINVAL;
 642                 goto err_stop_hw;
 643         }
 644         sd->hid_sensor_hub_client_devs = devm_kcalloc(&hdev->dev,
 645                                                       dev_cnt,
 646                                                       sizeof(struct mfd_cell),
 647                                                       GFP_KERNEL);
 648         if (sd->hid_sensor_hub_client_devs == NULL) {
 649                 hid_err(hdev, "Failed to allocate memory for mfd cells\n");
 650                 ret = -ENOMEM;
 651                 goto err_stop_hw;
 652         }
 653
 654         for (i = 0; i < hdev->maxcollection; ++i) {
 655                 struct hid_collection *collection = &hdev->collection[i];
 656
 657                 if (collection->type == HID_COLLECTION_PHYSICAL ||
 658                     collection->type == HID_COLLECTION_APPLICATION) {
 659
 660                         hsdev = devm_kzalloc(&hdev->dev, sizeof(*hsdev),
 661                                              GFP_KERNEL);
 662                         if (!hsdev) {
 663                                 hid_err(hdev, "cannot allocate hid_sensor_hub_device\n");
 664                                 ret = -ENOMEM;
 665                                 goto err_stop_hw;
 666                         }
 667                         hsdev->hdev = hdev;
 668                         hsdev->vendor_id = hdev->vendor;
 669                         hsdev->product_id = hdev->product;
 670                         hsdev->usage = collection->usage;
 671                         hsdev->mutex_ptr = devm_kzalloc(&hdev->dev,
 672                                                         sizeof(struct mutex),
 673                                                         GFP_KERNEL);
 674                         if (!hsdev->mutex_ptr) {
 675                                 ret = -ENOMEM;
 676                                 goto err_stop_hw;
 677                         }
 678                         mutex_init(hsdev->mutex_ptr);
 679                         hsdev->start_collection_index = i;
 680                         if (last_hsdev)
 681                                 last_hsdev->end_collection_index = i;
 682                         last_hsdev = hsdev;
 683                         name = devm_kasprintf(&hdev->dev, GFP_KERNEL,
 684                                               "HID-SENSOR-%x",
 685                                               collection->usage);
 686                         if (name == NULL) {
 687                                 hid_err(hdev, "Failed MFD device name\n");
 688                                 ret = -ENOMEM;
 689                                 goto err_stop_hw;
 690                         }
 691                         sd->hid_sensor_hub_client_devs[
 692                                 sd->hid_sensor_client_cnt].name = name;
 693                         sd->hid_sensor_hub_client_devs[
 694                                 sd->hid_sensor_client_cnt].platform_data =
 695                                                         hsdev;
 696                         sd->hid_sensor_hub_client_devs[
 697                                 sd->hid_sensor_client_cnt].pdata_size =
 698                                                         sizeof(*hsdev);
 699                         hid_dbg(hdev, "Adding %s:%d\n", name,
 700                                         hsdev->start_collection_index);
 701                         sd->hid_sensor_client_cnt++;
 702                         if (collection_hsdev)
 703                                 collection_hsdev->end_collection_index = i;
 704                         if (collection->type == HID_COLLECTION_APPLICATION &&
 705                             collection->usage == HID_USAGE_SENSOR_COLLECTION)
 706                                 collection_hsdev = hsdev;
 707                 }
 708         }
 709         if (last_hsdev)
 710                 last_hsdev->end_collection_index = i;
 711         if (collection_hsdev)
 712                 collection_hsdev->end_collection_index = i;
 713
 714         ret = mfd_add_hotplug_devices(&hdev->dev,
 715                         sd->hid_sensor_hub_client_devs,
 716                         sd->hid_sensor_client_cnt);
 717         if (ret < 0)
 718                 goto err_stop_hw;
 719
 720         return ret;
 721
 722 err_stop_hw:
 723         hid_hw_stop(hdev);
 724
 725         return ret;
 726 }
 727
 728 static void sensor_hub_remove(struct hid_device *hdev)
 729 {
 730         struct sensor_hub_data *data = hid_get_drvdata(hdev);
 731         unsigned long flags;
 732         int i;
 733
 734         hid_dbg(hdev, " hardware removed\n");
 735         hid_hw_close(hdev);
 736         hid_hw_stop(hdev);
 737         spin_lock_irqsave(&data->lock, flags);
 738         for (i = 0; i < data->hid_sensor_client_cnt; ++i) {
 739                 struct hid_sensor_hub_device *hsdev =
 740                         data->hid_sensor_hub_client_devs[i].platform_data;
 741                 if (hsdev->pending.status)
 742                         complete(&hsdev->pending.ready);
 743         }
 744         spin_unlock_irqrestore(&data->lock, flags);
 745         mfd_remove_devices(&hdev->dev);
 746         mutex_destroy(&data->mutex);
 747 }
 748
 749 static const struct hid_device_id sensor_hub_devices[] = {
 750         { HID_DEVICE(HID_BUS_ANY, HID_GROUP_SENSOR_HUB, HID_ANY_ID,
 751                      HID_ANY_ID) },
 752         { }
 753 };
 754 MODULE_DEVICE_TABLE(hid, sensor_hub_devices);
 755
 756 static struct hid_driver sensor_hub_driver = {
 757         .name = "hid-sensor-hub",
 758         .id_table = sensor_hub_devices,
 759         .probe = sensor_hub_probe,
 760         .remove = sensor_hub_remove,
 761         .raw_event = sensor_hub_raw_event,
 762         .report_fixup = sensor_hub_report_fixup,
 763 #ifdef CONFIG_PM
 764         .suspend = sensor_hub_suspend,
 765         .resume = sensor_hub_resume,
 766         .reset_resume = sensor_hub_reset_resume,
 767 #endif
 768 };
 769 module_hid_driver(sensor_hub_driver);
 770
 771 MODULE_DESCRIPTION("HID Sensor Hub driver");
 772 MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@intel.com>");
 773 MODULE_LICENSE("GPL");