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                         ret = hid_set_field(report->field[field_index], i,
 214                                             (__force __s32)cpu_to_le32(*buf32));
 215                         if (ret)
 216                                 goto done_proc;
 217
 218                         ++buf32;
 219                 }
 220         }
 221         if (remaining_bytes) {
 222                 value = 0;
 223                 memcpy(&value, (u8 *)buf32, remaining_bytes);
 224                 ret = hid_set_field(report->field[field_index], i,
 225                                     (__force __s32)cpu_to_le32(value));
 226                 if (ret)
 227                         goto done_proc;
 228         }
 229         hid_hw_request(hsdev->hdev, report, HID_REQ_SET_REPORT);
 230         hid_hw_wait(hsdev->hdev);
 231
 232 done_proc:
 233         mutex_unlock(&data->mutex);
 234
 235         return ret;
 236 }
 237 EXPORT_SYMBOL_GPL(sensor_hub_set_feature);
 238
 239 int sensor_hub_get_feature(struct hid_sensor_hub_device *hsdev, u32 report_id,
 240                            u32 field_index, int buffer_size, void *buffer)
 241 {
 242         struct hid_report *report;
 243         struct sensor_hub_data *data = hid_get_drvdata(hsdev->hdev);
 244         int report_size;
 245         int ret = 0;
 246         u8 *val_ptr;
 247         int buffer_index = 0;
 248         int i;
 249
 250         memset(buffer, 0, buffer_size);
 251
 252         mutex_lock(&data->mutex);
 253         report = sensor_hub_report(report_id, hsdev->hdev, HID_FEATURE_REPORT);
 254         if (!report || (field_index >= report->maxfield) ||
 255             report->field[field_index]->report_count < 1) {
 256                 ret = -EINVAL;
 257                 goto done_proc;
 258         }
 259         hid_hw_request(hsdev->hdev, report, HID_REQ_GET_REPORT);
 260         hid_hw_wait(hsdev->hdev);
 261
 262         /* calculate number of bytes required to read this field */
 263         report_size = DIV_ROUND_UP(report->field[field_index]->report_size,
 264                                    8) *
 265                                    report->field[field_index]->report_count;
 266         if (!report_size) {
 267                 ret = -EINVAL;
 268                 goto done_proc;
 269         }
 270         ret = min(report_size, buffer_size);
 271
 272         val_ptr = (u8 *)report->field[field_index]->value;
 273         for (i = 0; i < report->field[field_index]->report_count; ++i) {
 274                 if (buffer_index >= ret)
 275                         break;
 276
 277                 memcpy(&((u8 *)buffer)[buffer_index], val_ptr,
 278                        report->field[field_index]->report_size / 8);
 279                 val_ptr += sizeof(__s32);
 280                 buffer_index += (report->field[field_index]->report_size / 8);
 281         }
 282
 283 done_proc:
 284         mutex_unlock(&data->mutex);
 285
 286         return ret;
 287 }
 288 EXPORT_SYMBOL_GPL(sensor_hub_get_feature);
 289
 290
 291 int sensor_hub_input_attr_get_raw_value(struct hid_sensor_hub_device *hsdev,
 292                                         u32 usage_id,
 293                                         u32 attr_usage_id, u32 report_id,
 294                                         enum sensor_hub_read_flags flag,
 295                                         bool is_signed)
 296 {
 297         struct sensor_hub_data *data = hid_get_drvdata(hsdev->hdev);
 298         unsigned long flags;
 299         struct hid_report *report;
 300         int ret_val = 0;
 301
 302         report = sensor_hub_report(report_id, hsdev->hdev,
 303                                    HID_INPUT_REPORT);
 304         if (!report)
 305                 return -EINVAL;
 306
 307         mutex_lock(hsdev->mutex_ptr);
 308         if (flag == SENSOR_HUB_SYNC) {
 309                 memset(&hsdev->pending, 0, sizeof(hsdev->pending));
 310                 init_completion(&hsdev->pending.ready);
 311                 hsdev->pending.usage_id = usage_id;
 312                 hsdev->pending.attr_usage_id = attr_usage_id;
 313                 hsdev->pending.raw_size = 0;
 314
 315                 spin_lock_irqsave(&data->lock, flags);
 316                 hsdev->pending.status = true;
 317                 spin_unlock_irqrestore(&data->lock, flags);
 318         }
 319         mutex_lock(&data->mutex);
 320         hid_hw_request(hsdev->hdev, report, HID_REQ_GET_REPORT);
 321         mutex_unlock(&data->mutex);
 322         if (flag == SENSOR_HUB_SYNC) {
 323                 wait_for_completion_interruptible_timeout(
 324                                                 &hsdev->pending.ready, HZ*5);
 325                 switch (hsdev->pending.raw_size) {
 326                 case 1:
 327                         if (is_signed)
 328                                 ret_val = *(s8 *)hsdev->pending.raw_data;
 329                         else
 330                                 ret_val = *(u8 *)hsdev->pending.raw_data;
 331                         break;
 332                 case 2:
 333                         if (is_signed)
 334                                 ret_val = *(s16 *)hsdev->pending.raw_data;
 335                         else
 336                                 ret_val = *(u16 *)hsdev->pending.raw_data;
 337                         break;
 338                 case 4:
 339                         ret_val = *(u32 *)hsdev->pending.raw_data;
 340                         break;
 341                 default:
 342                         ret_val = 0;
 343                 }
 344                 kfree(hsdev->pending.raw_data);
 345                 hsdev->pending.status = false;
 346         }
 347         mutex_unlock(hsdev->mutex_ptr);
 348
 349         return ret_val;
 350 }
 351 EXPORT_SYMBOL_GPL(sensor_hub_input_attr_get_raw_value);
 352
 353 int hid_sensor_get_usage_index(struct hid_sensor_hub_device *hsdev,
 354                                 u32 report_id, int field_index, u32 usage_id)
 355 {
 356         struct hid_report *report;
 357         struct hid_field *field;
 358         int i;
 359
 360         report = sensor_hub_report(report_id, hsdev->hdev, HID_FEATURE_REPORT);
 361         if (!report || (field_index >= report->maxfield))
 362                 goto done_proc;
 363
 364         field = report->field[field_index];
 365         for (i = 0; i < field->maxusage; ++i) {
 366                 if (field->usage[i].hid == usage_id)
 367                         return field->usage[i].usage_index;
 368         }
 369
 370 done_proc:
 371         return -EINVAL;
 372 }
 373 EXPORT_SYMBOL_GPL(hid_sensor_get_usage_index);
 374
 375 int sensor_hub_input_get_attribute_info(struct hid_sensor_hub_device *hsdev,
 376                                 u8 type,
 377                                 u32 usage_id,
 378                                 u32 attr_usage_id,
 379                                 struct hid_sensor_hub_attribute_info *info)
 380 {
 381         int ret = -1;
 382         int i;
 383         struct hid_report *report;
 384         struct hid_field *field;
 385         struct hid_report_enum *report_enum;
 386         struct hid_device *hdev = hsdev->hdev;
 387
 388         /* Initialize with defaults */
 389         info->usage_id = usage_id;
 390         info->attrib_id = attr_usage_id;
 391         info->report_id = -1;
 392         info->index = -1;
 393         info->units = -1;
 394         info->unit_expo = -1;
 395
 396         report_enum = &hdev->report_enum[type];
 397         list_for_each_entry(report, &report_enum->report_list, list) {
 398                 for (i = 0; i < report->maxfield; ++i) {
 399                         field = report->field[i];
 400                         if (field->maxusage) {
 401                                 if (field->physical == usage_id &&
 402                                         (field->logical == attr_usage_id ||
 403                                         field->usage[0].hid ==
 404                                                         attr_usage_id) &&
 405                                         (field->usage[0].collection_index >=
 406                                         hsdev->start_collection_index) &&
 407                                         (field->usage[0].collection_index <
 408                                         hsdev->end_collection_index)) {
 409
 410                                         sensor_hub_fill_attr_info(info, i,
 411                                                                 report->id,
 412                                                                 field);
 413                                         ret = 0;
 414                                         break;
 415                                 }
 416                         }
 417                 }
 418
 419         }
 420
 421         return ret;
 422 }
 423 EXPORT_SYMBOL_GPL(sensor_hub_input_get_attribute_info);
 424
 425 #ifdef CONFIG_PM
 426 static int sensor_hub_suspend(struct hid_device *hdev, pm_message_t message)
 427 {
 428         struct sensor_hub_data *pdata = hid_get_drvdata(hdev);
 429         struct hid_sensor_hub_callbacks_list *callback;
 430         unsigned long flags;
 431
 432         hid_dbg(hdev, " sensor_hub_suspend\n");
 433         spin_lock_irqsave(&pdata->dyn_callback_lock, flags);
 434         list_for_each_entry(callback, &pdata->dyn_callback_list, list) {
 435                 if (callback->usage_callback->suspend)
 436                         callback->usage_callback->suspend(
 437                                         callback->hsdev, callback->priv);
 438         }
 439         spin_unlock_irqrestore(&pdata->dyn_callback_lock, flags);
 440
 441         return 0;
 442 }
 443
 444 static int sensor_hub_resume(struct hid_device *hdev)
 445 {
 446         struct sensor_hub_data *pdata = hid_get_drvdata(hdev);
 447         struct hid_sensor_hub_callbacks_list *callback;
 448         unsigned long flags;
 449
 450         hid_dbg(hdev, " sensor_hub_resume\n");
 451         spin_lock_irqsave(&pdata->dyn_callback_lock, flags);
 452         list_for_each_entry(callback, &pdata->dyn_callback_list, list) {
 453                 if (callback->usage_callback->resume)
 454                         callback->usage_callback->resume(
 455                                         callback->hsdev, callback->priv);
 456         }
 457         spin_unlock_irqrestore(&pdata->dyn_callback_lock, flags);
 458
 459         return 0;
 460 }
 461
 462 static int sensor_hub_reset_resume(struct hid_device *hdev)
 463 {
 464         return 0;
 465 }
 466 #endif
 467
 468 /*
 469  * Handle raw report as sent by device
 470  */
 471 static int sensor_hub_raw_event(struct hid_device *hdev,
 472                 struct hid_report *report, u8 *raw_data, int size)
 473 {
 474         int i;
 475         u8 *ptr;
 476         int sz;
 477         struct sensor_hub_data *pdata = hid_get_drvdata(hdev);
 478         unsigned long flags;
 479         struct hid_sensor_hub_callbacks *callback = NULL;
 480         struct hid_collection *collection = NULL;
 481         void *priv = NULL;
 482         struct hid_sensor_hub_device *hsdev = NULL;
 483
 484         hid_dbg(hdev, "sensor_hub_raw_event report id:0x%x size:%d type:%d\n",
 485                          report->id, size, report->type);
 486         hid_dbg(hdev, "maxfield:%d\n", report->maxfield);
 487         if (report->type != HID_INPUT_REPORT)
 488                 return 1;
 489
 490         ptr = raw_data;
 491         if (report->id)
 492                 ptr++; /* Skip report id */
 493
 494         spin_lock_irqsave(&pdata->lock, flags);
 495
 496         for (i = 0; i < report->maxfield; ++i) {
 497                 hid_dbg(hdev, "%d collection_index:%x hid:%x sz:%x\n",
 498                                 i, report->field[i]->usage->collection_index,
 499                                 report->field[i]->usage->hid,
 500                                 (report->field[i]->report_size *
 501                                         report->field[i]->report_count)/8);
 502                 sz = (report->field[i]->report_size *
 503                                         report->field[i]->report_count)/8;
 504                 collection = &hdev->collection[
 505                                 report->field[i]->usage->collection_index];
 506                 hid_dbg(hdev, "collection->usage %x\n",
 507                                         collection->usage);
 508
 509                 callback = sensor_hub_get_callback(hdev,
 510                                 report->field[i]->physical,
 511                                 report->field[i]->usage[0].collection_index,
 512                                 &hsdev, &priv);
 513                 if (!callback) {
 514                         ptr += sz;
 515                         continue;
 516                 }
 517                 if (hsdev->pending.status && (hsdev->pending.attr_usage_id ==
 518                                               report->field[i]->usage->hid ||
 519                                               hsdev->pending.attr_usage_id ==
 520                                               report->field[i]->logical)) {
 521                         hid_dbg(hdev, "data was pending ...\n");
 522                         hsdev->pending.raw_data = kmemdup(ptr, sz, GFP_ATOMIC);
 523                         if (hsdev->pending.raw_data)
 524                                 hsdev->pending.raw_size = sz;
 525                         else
 526                                 hsdev->pending.raw_size = 0;
 527                         complete(&hsdev->pending.ready);
 528                 }
 529                 if (callback->capture_sample) {
 530                         if (report->field[i]->logical)
 531                                 callback->capture_sample(hsdev,
 532                                         report->field[i]->logical, sz, ptr,
 533                                         callback->pdev);
 534                         else
 535                                 callback->capture_sample(hsdev,
 536                                         report->field[i]->usage->hid, sz, ptr,
 537                                         callback->pdev);
 538                 }
 539                 ptr += sz;
 540         }
 541         if (callback && collection && callback->send_event)
 542                 callback->send_event(hsdev, collection->usage,
 543                                 callback->pdev);
 544         spin_unlock_irqrestore(&pdata->lock, flags);
 545
 546         return 1;
 547 }
 548
 549 int sensor_hub_device_open(struct hid_sensor_hub_device *hsdev)
 550 {
 551         int ret = 0;
 552         struct sensor_hub_data *data =  hid_get_drvdata(hsdev->hdev);
 553
 554         mutex_lock(&data->mutex);
 555         if (!data->ref_cnt) {
 556                 ret = hid_hw_open(hsdev->hdev);
 557                 if (ret) {
 558                         hid_err(hsdev->hdev, "failed to open hid device\n");
 559                         mutex_unlock(&data->mutex);
 560                         return ret;
 561                 }
 562         }
 563         data->ref_cnt++;
 564         mutex_unlock(&data->mutex);
 565
 566         return ret;
 567 }
 568 EXPORT_SYMBOL_GPL(sensor_hub_device_open);
 569
 570 void sensor_hub_device_close(struct hid_sensor_hub_device *hsdev)
 571 {
 572         struct sensor_hub_data *data =  hid_get_drvdata(hsdev->hdev);
 573
 574         mutex_lock(&data->mutex);
 575         data->ref_cnt--;
 576         if (!data->ref_cnt)
 577                 hid_hw_close(hsdev->hdev);
 578         mutex_unlock(&data->mutex);
 579 }
 580 EXPORT_SYMBOL_GPL(sensor_hub_device_close);
 581
 582 static __u8 *sensor_hub_report_fixup(struct hid_device *hdev, __u8 *rdesc,
 583                 unsigned int *rsize)
 584 {
 585         /*
 586          * Checks if the report descriptor of Thinkpad Helix 2 has a logical
 587          * minimum for magnetic flux axis greater than the maximum.
 588          */
 589         if (hdev->product == USB_DEVICE_ID_TEXAS_INSTRUMENTS_LENOVO_YOGA &&
 590                 *rsize == 2558 && rdesc[913] == 0x17 && rdesc[914] == 0x40 &&
 591                 rdesc[915] == 0x81 && rdesc[916] == 0x08 &&
 592                 rdesc[917] == 0x00 && rdesc[918] == 0x27 &&
 593                 rdesc[921] == 0x07 && rdesc[922] == 0x00) {
 594                 /* Sets negative logical minimum for mag x, y and z */
 595                 rdesc[914] = rdesc[935] = rdesc[956] = 0xc0;
 596                 rdesc[915] = rdesc[936] = rdesc[957] = 0x7e;
 597                 rdesc[916] = rdesc[937] = rdesc[958] = 0xf7;
 598                 rdesc[917] = rdesc[938] = rdesc[959] = 0xff;
 599         }
 600
 601         return rdesc;
 602 }
 603
 604 static int sensor_hub_probe(struct hid_device *hdev,
 605                                 const struct hid_device_id *id)
 606 {
 607         int ret;
 608         struct sensor_hub_data *sd;
 609         int i;
 610         char *name;
 611         int dev_cnt;
 612         struct hid_sensor_hub_device *hsdev;
 613         struct hid_sensor_hub_device *last_hsdev = NULL;
 614         struct hid_sensor_hub_device *collection_hsdev = NULL;
 615
 616         sd = devm_kzalloc(&hdev->dev, sizeof(*sd), GFP_KERNEL);
 617         if (!sd) {
 618                 hid_err(hdev, "cannot allocate Sensor data\n");
 619                 return -ENOMEM;
 620         }
 621
 622         hid_set_drvdata(hdev, sd);
 623         sd->quirks = id->driver_data;
 624
 625         spin_lock_init(&sd->lock);
 626         spin_lock_init(&sd->dyn_callback_lock);
 627         mutex_init(&sd->mutex);
 628         ret = hid_parse(hdev);
 629         if (ret) {
 630                 hid_err(hdev, "parse failed\n");
 631                 return ret;
 632         }
 633         INIT_LIST_HEAD(&hdev->inputs);
 634
 635         ret = hid_hw_start(hdev, 0);
 636         if (ret) {
 637                 hid_err(hdev, "hw start failed\n");
 638                 return ret;
 639         }
 640         INIT_LIST_HEAD(&sd->dyn_callback_list);
 641         sd->hid_sensor_client_cnt = 0;
 642
 643         dev_cnt = sensor_hub_get_physical_device_count(hdev);
 644         if (dev_cnt > HID_MAX_PHY_DEVICES) {
 645                 hid_err(hdev, "Invalid Physical device count\n");
 646                 ret = -EINVAL;
 647                 goto err_stop_hw;
 648         }
 649         sd->hid_sensor_hub_client_devs = devm_kcalloc(&hdev->dev,
 650                                                       dev_cnt,
 651                                                       sizeof(struct mfd_cell),
 652                                                       GFP_KERNEL);
 653         if (sd->hid_sensor_hub_client_devs == NULL) {
 654                 hid_err(hdev, "Failed to allocate memory for mfd cells\n");
 655                 ret = -ENOMEM;
 656                 goto err_stop_hw;
 657         }
 658
 659         for (i = 0; i < hdev->maxcollection; ++i) {
 660                 struct hid_collection *collection = &hdev->collection[i];
 661
 662                 if (collection->type == HID_COLLECTION_PHYSICAL ||
 663                     collection->type == HID_COLLECTION_APPLICATION) {
 664
 665                         hsdev = devm_kzalloc(&hdev->dev, sizeof(*hsdev),
 666                                              GFP_KERNEL);
 667                         if (!hsdev) {
 668                                 hid_err(hdev, "cannot allocate hid_sensor_hub_device\n");
 669                                 ret = -ENOMEM;
 670                                 goto err_stop_hw;
 671                         }
 672                         hsdev->hdev = hdev;
 673                         hsdev->vendor_id = hdev->vendor;
 674                         hsdev->product_id = hdev->product;
 675                         hsdev->usage = collection->usage;
 676                         hsdev->mutex_ptr = devm_kzalloc(&hdev->dev,
 677                                                         sizeof(struct mutex),
 678                                                         GFP_KERNEL);
 679                         if (!hsdev->mutex_ptr) {
 680                                 ret = -ENOMEM;
 681                                 goto err_stop_hw;
 682                         }
 683                         mutex_init(hsdev->mutex_ptr);
 684                         hsdev->start_collection_index = i;
 685                         if (last_hsdev)
 686                                 last_hsdev->end_collection_index = i;
 687                         last_hsdev = hsdev;
 688                         name = devm_kasprintf(&hdev->dev, GFP_KERNEL,
 689                                               "HID-SENSOR-%x",
 690                                               collection->usage);
 691                         if (name == NULL) {
 692                                 hid_err(hdev, "Failed MFD device name\n");
 693                                 ret = -ENOMEM;
 694                                 goto err_stop_hw;
 695                         }
 696                         sd->hid_sensor_hub_client_devs[
 697                                 sd->hid_sensor_client_cnt].name = name;
 698                         sd->hid_sensor_hub_client_devs[
 699                                 sd->hid_sensor_client_cnt].platform_data =
 700                                                         hsdev;
 701                         sd->hid_sensor_hub_client_devs[
 702                                 sd->hid_sensor_client_cnt].pdata_size =
 703                                                         sizeof(*hsdev);
 704                         hid_dbg(hdev, "Adding %s:%d\n", name,
 705                                         hsdev->start_collection_index);
 706                         sd->hid_sensor_client_cnt++;
 707                         if (collection_hsdev)
 708                                 collection_hsdev->end_collection_index = i;
 709                         if (collection->type == HID_COLLECTION_APPLICATION &&
 710                             collection->usage == HID_USAGE_SENSOR_COLLECTION)
 711                                 collection_hsdev = hsdev;
 712                 }
 713         }
 714         if (last_hsdev)
 715                 last_hsdev->end_collection_index = i;
 716         if (collection_hsdev)
 717                 collection_hsdev->end_collection_index = i;
 718
 719         ret = mfd_add_hotplug_devices(&hdev->dev,
 720                         sd->hid_sensor_hub_client_devs,
 721                         sd->hid_sensor_client_cnt);
 722         if (ret < 0)
 723                 goto err_stop_hw;
 724
 725         return ret;
 726
 727 err_stop_hw:
 728         hid_hw_stop(hdev);
 729
 730         return ret;
 731 }
 732
 733 static void sensor_hub_remove(struct hid_device *hdev)
 734 {
 735         struct sensor_hub_data *data = hid_get_drvdata(hdev);
 736         unsigned long flags;
 737         int i;
 738
 739         hid_dbg(hdev, " hardware removed\n");
 740         hid_hw_close(hdev);
 741         hid_hw_stop(hdev);
 742         spin_lock_irqsave(&data->lock, flags);
 743         for (i = 0; i < data->hid_sensor_client_cnt; ++i) {
 744                 struct hid_sensor_hub_device *hsdev =
 745                         data->hid_sensor_hub_client_devs[i].platform_data;
 746                 if (hsdev->pending.status)
 747                         complete(&hsdev->pending.ready);
 748         }
 749         spin_unlock_irqrestore(&data->lock, flags);
 750         mfd_remove_devices(&hdev->dev);
 751         mutex_destroy(&data->mutex);
 752 }
 753
 754 static const struct hid_device_id sensor_hub_devices[] = {
 755         { HID_DEVICE(HID_BUS_ANY, HID_GROUP_SENSOR_HUB, HID_ANY_ID,
 756                      HID_ANY_ID) },
 757         { }
 758 };
 759 MODULE_DEVICE_TABLE(hid, sensor_hub_devices);
 760
 761 static struct hid_driver sensor_hub_driver = {
 762         .name = "hid-sensor-hub",
 763         .id_table = sensor_hub_devices,
 764         .probe = sensor_hub_probe,
 765         .remove = sensor_hub_remove,
 766         .raw_event = sensor_hub_raw_event,
 767         .report_fixup = sensor_hub_report_fixup,
 768 #ifdef CONFIG_PM
 769         .suspend = sensor_hub_suspend,
 770         .resume = sensor_hub_resume,
 771         .reset_resume = sensor_hub_reset_resume,
 772 #endif
 773 };
 774 module_hid_driver(sensor_hub_driver);
 775
 776 MODULE_DESCRIPTION("HID Sensor Hub driver");
 777 MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@intel.com>");
 778 MODULE_LICENSE("GPL");