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  * @mutex:              Mutex to serialize synchronous request.
  22  * @lock:               Spin lock to protect pending request structure.
  23  * @dyn_callback_list:  Holds callback function
  24  * @dyn_callback_lock:  spin lock to protect callback list
  25  * @hid_sensor_hub_client_devs: Stores all MFD cells for a hub instance.
  26  * @hid_sensor_client_cnt: Number of MFD cells, (no of sensors attached).
  27  * @ref_cnt:            Number of MFD clients have opened this device
  28  */
  29 struct sensor_hub_data {
  30         struct mutex mutex;
  31         spinlock_t lock;
  32         struct list_head dyn_callback_list;
  33         spinlock_t dyn_callback_lock;
  34         struct mfd_cell *hid_sensor_hub_client_devs;
  35         int hid_sensor_client_cnt;
  36         int ref_cnt;
  37 };
  38
  39 /**
  40  * struct hid_sensor_hub_callbacks_list - Stores callback list
  41  * @list:               list head.
  42  * @usage_id:           usage id for a physical device.
  43  * @hsdev:              Stored hid instance for current hub device.
  44  * @usage_callback:     Stores registered callback functions.
  45  * @priv:               Private data for a physical device.
  46  */
  47 struct hid_sensor_hub_callbacks_list {
  48         struct list_head list;
  49         u32 usage_id;
  50         struct hid_sensor_hub_device *hsdev;
  51         struct hid_sensor_hub_callbacks *usage_callback;
  52         void *priv;
  53 };
  54
  55 static struct hid_report *sensor_hub_report(int id, struct hid_device *hdev,
  56                                                 int dir)
  57 {
  58         struct hid_report *report;
  59
  60         list_for_each_entry(report, &hdev->report_enum[dir].report_list, list) {
  61                 if (report->id == id)
  62                         return report;
  63         }
  64         hid_warn(hdev, "No report with id 0x%x found\n", id);
  65
  66         return NULL;
  67 }
  68
  69 static int sensor_hub_get_physical_device_count(struct hid_device *hdev)
  70 {
  71         int i;
  72         int count = 0;
  73
  74         for (i = 0; i < hdev->maxcollection; ++i) {
  75                 struct hid_collection *collection = &hdev->collection[i];
  76                 if (collection->type == HID_COLLECTION_PHYSICAL ||
  77                     collection->type == HID_COLLECTION_APPLICATION)
  78                         ++count;
  79         }
  80
  81         return count;
  82 }
  83
  84 static void sensor_hub_fill_attr_info(
  85                 struct hid_sensor_hub_attribute_info *info,
  86                 s32 index, s32 report_id, struct hid_field *field)
  87 {
  88         info->index = index;
  89         info->report_id = report_id;
  90         info->units = field->unit;
  91         info->unit_expo = field->unit_exponent;
  92         info->size = (field->report_size * field->report_count)/8;
  93         info->logical_minimum = field->logical_minimum;
  94         info->logical_maximum = field->logical_maximum;
  95 }
  96
  97 static struct hid_sensor_hub_callbacks *sensor_hub_get_callback(
  98                                         struct hid_device *hdev,
  99                                         u32 usage_id,
 100                                         int collection_index,
 101                                         struct hid_sensor_hub_device **hsdev,
 102                                         void **priv)
 103 {
 104         struct hid_sensor_hub_callbacks_list *callback;
 105         struct sensor_hub_data *pdata = hid_get_drvdata(hdev);
 106         unsigned long flags;
 107
 108         spin_lock_irqsave(&pdata->dyn_callback_lock, flags);
 109         list_for_each_entry(callback, &pdata->dyn_callback_list, list)
 110                 if ((callback->usage_id == usage_id ||
 111                      callback->usage_id == HID_USAGE_SENSOR_COLLECTION) &&
 112                         (collection_index >=
 113                                 callback->hsdev->start_collection_index) &&
 114                         (collection_index <
 115                                 callback->hsdev->end_collection_index)) {
 116                         *priv = callback->priv;
 117                         *hsdev = callback->hsdev;
 118                         spin_unlock_irqrestore(&pdata->dyn_callback_lock,
 119                                                flags);
 120                         return callback->usage_callback;
 121                 }
 122         spin_unlock_irqrestore(&pdata->dyn_callback_lock, flags);
 123
 124         return NULL;
 125 }
 126
 127 int sensor_hub_register_callback(struct hid_sensor_hub_device *hsdev,
 128                         u32 usage_id,
 129                         struct hid_sensor_hub_callbacks *usage_callback)
 130 {
 131         struct hid_sensor_hub_callbacks_list *callback;
 132         struct sensor_hub_data *pdata = hid_get_drvdata(hsdev->hdev);
 133         unsigned long flags;
 134
 135         spin_lock_irqsave(&pdata->dyn_callback_lock, flags);
 136         list_for_each_entry(callback, &pdata->dyn_callback_list, list)
 137                 if (callback->usage_id == usage_id &&
 138                                                 callback->hsdev == hsdev) {
 139                         spin_unlock_irqrestore(&pdata->dyn_callback_lock, flags);
 140                         return -EINVAL;
 141                 }
 142         callback = kzalloc(sizeof(*callback), GFP_ATOMIC);
 143         if (!callback) {
 144                 spin_unlock_irqrestore(&pdata->dyn_callback_lock, flags);
 145                 return -ENOMEM;
 146         }
 147         callback->hsdev = hsdev;
 148         callback->usage_callback = usage_callback;
 149         callback->usage_id = usage_id;
 150         callback->priv = NULL;
 151         /*
 152          * If there is a handler registered for the collection type, then
 153          * it will handle all reports for sensors in this collection. If
 154          * there is also an individual sensor handler registration, then
 155          * we want to make sure that the reports are directed to collection
 156          * handler, as this may be a fusion sensor. So add collection handlers
 157          * to the beginning of the list, so that they are matched first.
 158          */
 159         if (usage_id == HID_USAGE_SENSOR_COLLECTION)
 160                 list_add(&callback->list, &pdata->dyn_callback_list);
 161         else
 162                 list_add_tail(&callback->list, &pdata->dyn_callback_list);
 163         spin_unlock_irqrestore(&pdata->dyn_callback_lock, flags);
 164
 165         return 0;
 166 }
 167 EXPORT_SYMBOL_GPL(sensor_hub_register_callback);
 168
 169 int sensor_hub_remove_callback(struct hid_sensor_hub_device *hsdev,
 170                                 u32 usage_id)
 171 {
 172         struct hid_sensor_hub_callbacks_list *callback;
 173         struct sensor_hub_data *pdata = hid_get_drvdata(hsdev->hdev);
 174         unsigned long flags;
 175
 176         spin_lock_irqsave(&pdata->dyn_callback_lock, flags);
 177         list_for_each_entry(callback, &pdata->dyn_callback_list, list)
 178                 if (callback->usage_id == usage_id &&
 179                                                 callback->hsdev == hsdev) {
 180                         list_del(&callback->list);
 181                         kfree(callback);
 182                         break;
 183                 }
 184         spin_unlock_irqrestore(&pdata->dyn_callback_lock, flags);
 185
 186         return 0;
 187 }
 188 EXPORT_SYMBOL_GPL(sensor_hub_remove_callback);
 189
 190 int sensor_hub_set_feature(struct hid_sensor_hub_device *hsdev, u32 report_id,
 191                            u32 field_index, int buffer_size, void *buffer)
 192 {
 193         struct hid_report *report;
 194         struct sensor_hub_data *data = hid_get_drvdata(hsdev->hdev);
 195         __s32 *buf32 = buffer;
 196         int i = 0;
 197         int remaining_bytes;
 198         __s32 value;
 199         int ret = 0;
 200
 201         mutex_lock(&data->mutex);
 202         report = sensor_hub_report(report_id, hsdev->hdev, HID_FEATURE_REPORT);
 203         if (!report || (field_index >= report->maxfield)) {
 204                 ret = -EINVAL;
 205                 goto done_proc;
 206         }
 207
 208         remaining_bytes = buffer_size % sizeof(__s32);
 209         buffer_size = buffer_size / sizeof(__s32);
 210         if (buffer_size) {
 211                 for (i = 0; i < buffer_size; ++i) {
 212                         ret = hid_set_field(report->field[field_index], i,
 213                                             (__force __s32)cpu_to_le32(*buf32));
 214                         if (ret)
 215                                 goto done_proc;
 216
 217                         ++buf32;
 218                 }
 219         }
 220         if (remaining_bytes) {
 221                 value = 0;
 222                 memcpy(&value, (u8 *)buf32, remaining_bytes);
 223                 ret = hid_set_field(report->field[field_index], i,
 224                                     (__force __s32)cpu_to_le32(value));
 225                 if (ret)
 226                         goto done_proc;
 227         }
 228         hid_hw_request(hsdev->hdev, report, HID_REQ_SET_REPORT);
 229         hid_hw_wait(hsdev->hdev);
 230
 231 done_proc:
 232         mutex_unlock(&data->mutex);
 233
 234         return ret;
 235 }
 236 EXPORT_SYMBOL_GPL(sensor_hub_set_feature);
 237
 238 int sensor_hub_get_feature(struct hid_sensor_hub_device *hsdev, u32 report_id,
 239                            u32 field_index, int buffer_size, void *buffer)
 240 {
 241         struct hid_report *report;
 242         struct sensor_hub_data *data = hid_get_drvdata(hsdev->hdev);
 243         int report_size;
 244         int ret = 0;
 245         u8 *val_ptr;
 246         int buffer_index = 0;
 247         int i;
 248
 249         memset(buffer, 0, buffer_size);
 250
 251         mutex_lock(&data->mutex);
 252         report = sensor_hub_report(report_id, hsdev->hdev, HID_FEATURE_REPORT);
 253         if (!report || (field_index >= report->maxfield) ||
 254             report->field[field_index]->report_count < 1) {
 255                 ret = -EINVAL;
 256                 goto done_proc;
 257         }
 258         hid_hw_request(hsdev->hdev, report, HID_REQ_GET_REPORT);
 259         hid_hw_wait(hsdev->hdev);
 260
 261         /* calculate number of bytes required to read this field */
 262         report_size = DIV_ROUND_UP(report->field[field_index]->report_size,
 263                                    8) *
 264                                    report->field[field_index]->report_count;
 265         if (!report_size) {
 266                 ret = -EINVAL;
 267                 goto done_proc;
 268         }
 269         ret = min(report_size, buffer_size);
 270
 271         val_ptr = (u8 *)report->field[field_index]->value;
 272         for (i = 0; i < report->field[field_index]->report_count; ++i) {
 273                 if (buffer_index >= ret)
 274                         break;
 275
 276                 memcpy(&((u8 *)buffer)[buffer_index], val_ptr,
 277                        report->field[field_index]->report_size / 8);
 278                 val_ptr += sizeof(__s32);
 279                 buffer_index += (report->field[field_index]->report_size / 8);
 280         }
 281
 282 done_proc:
 283         mutex_unlock(&data->mutex);
 284
 285         return ret;
 286 }
 287 EXPORT_SYMBOL_GPL(sensor_hub_get_feature);
 288
 289
 290 int sensor_hub_input_attr_get_raw_value(struct hid_sensor_hub_device *hsdev,
 291                                         u32 usage_id,
 292                                         u32 attr_usage_id, u32 report_id,
 293                                         enum sensor_hub_read_flags flag,
 294                                         bool is_signed)
 295 {
 296         struct sensor_hub_data *data = hid_get_drvdata(hsdev->hdev);
 297         unsigned long flags;
 298         struct hid_report *report;
 299         int ret_val = 0;
 300
 301         report = sensor_hub_report(report_id, hsdev->hdev,
 302                                    HID_INPUT_REPORT);
 303         if (!report)
 304                 return -EINVAL;
 305
 306         mutex_lock(hsdev->mutex_ptr);
 307         if (flag == SENSOR_HUB_SYNC) {
 308                 memset(&hsdev->pending, 0, sizeof(hsdev->pending));
 309                 init_completion(&hsdev->pending.ready);
 310                 hsdev->pending.usage_id = usage_id;
 311                 hsdev->pending.attr_usage_id = attr_usage_id;
 312                 hsdev->pending.raw_size = 0;
 313
 314                 spin_lock_irqsave(&data->lock, flags);
 315                 hsdev->pending.status = true;
 316                 spin_unlock_irqrestore(&data->lock, flags);
 317         }
 318         mutex_lock(&data->mutex);
 319         hid_hw_request(hsdev->hdev, report, HID_REQ_GET_REPORT);
 320         mutex_unlock(&data->mutex);
 321         if (flag == SENSOR_HUB_SYNC) {
 322                 wait_for_completion_interruptible_timeout(
 323                                                 &hsdev->pending.ready, HZ*5);
 324                 switch (hsdev->pending.raw_size) {
 325                 case 1:
 326                         if (is_signed)
 327                                 ret_val = *(s8 *)hsdev->pending.raw_data;
 328                         else
 329                                 ret_val = *(u8 *)hsdev->pending.raw_data;
 330                         break;
 331                 case 2:
 332                         if (is_signed)
 333                                 ret_val = *(s16 *)hsdev->pending.raw_data;
 334                         else
 335                                 ret_val = *(u16 *)hsdev->pending.raw_data;
 336                         break;
 337                 case 4:
 338                         ret_val = *(u32 *)hsdev->pending.raw_data;
 339                         break;
 340                 default:
 341                         ret_val = 0;
 342                 }
 343                 kfree(hsdev->pending.raw_data);
 344                 hsdev->pending.status = false;
 345         }
 346         mutex_unlock(hsdev->mutex_ptr);
 347
 348         return ret_val;
 349 }
 350 EXPORT_SYMBOL_GPL(sensor_hub_input_attr_get_raw_value);
 351
 352 int hid_sensor_get_usage_index(struct hid_sensor_hub_device *hsdev,
 353                                 u32 report_id, int field_index, u32 usage_id)
 354 {
 355         struct hid_report *report;
 356         struct hid_field *field;
 357         int i;
 358
 359         report = sensor_hub_report(report_id, hsdev->hdev, HID_FEATURE_REPORT);
 360         if (!report || (field_index >= report->maxfield))
 361                 goto done_proc;
 362
 363         field = report->field[field_index];
 364         for (i = 0; i < field->maxusage; ++i) {
 365                 if (field->usage[i].hid == usage_id)
 366                         return field->usage[i].usage_index;
 367         }
 368
 369 done_proc:
 370         return -EINVAL;
 371 }
 372 EXPORT_SYMBOL_GPL(hid_sensor_get_usage_index);
 373
 374 int sensor_hub_input_get_attribute_info(struct hid_sensor_hub_device *hsdev,
 375                                 u8 type,
 376                                 u32 usage_id,
 377                                 u32 attr_usage_id,
 378                                 struct hid_sensor_hub_attribute_info *info)
 379 {
 380         int ret = -1;
 381         int i;
 382         struct hid_report *report;
 383         struct hid_field *field;
 384         struct hid_report_enum *report_enum;
 385         struct hid_device *hdev = hsdev->hdev;
 386
 387         /* Initialize with defaults */
 388         info->usage_id = usage_id;
 389         info->attrib_id = attr_usage_id;
 390         info->report_id = -1;
 391         info->index = -1;
 392         info->units = -1;
 393         info->unit_expo = -1;
 394
 395         report_enum = &hdev->report_enum[type];
 396         list_for_each_entry(report, &report_enum->report_list, list) {
 397                 for (i = 0; i < report->maxfield; ++i) {
 398                         field = report->field[i];
 399                         if (field->maxusage) {
 400                                 if ((field->physical == usage_id ||
 401                                      field->application == 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 ? report->field[i]->physical :
 511                                                              report->field[i]->application,
 512                                 report->field[i]->usage[0].collection_index,
 513                                 &hsdev, &priv);
 514                 if (!callback) {
 515                         ptr += sz;
 516                         continue;
 517                 }
 518                 if (hsdev->pending.status && (hsdev->pending.attr_usage_id ==
 519                                               report->field[i]->usage->hid ||
 520                                               hsdev->pending.attr_usage_id ==
 521                                               report->field[i]->logical)) {
 522                         hid_dbg(hdev, "data was pending ...\n");
 523                         hsdev->pending.raw_data = kmemdup(ptr, sz, GFP_ATOMIC);
 524                         if (hsdev->pending.raw_data)
 525                                 hsdev->pending.raw_size = sz;
 526                         else
 527                                 hsdev->pending.raw_size = 0;
 528                         complete(&hsdev->pending.ready);
 529                 }
 530                 if (callback->capture_sample) {
 531                         if (report->field[i]->logical)
 532                                 callback->capture_sample(hsdev,
 533                                         report->field[i]->logical, sz, ptr,
 534                                         callback->pdev);
 535                         else
 536                                 callback->capture_sample(hsdev,
 537                                         report->field[i]->usage->hid, sz, ptr,
 538                                         callback->pdev);
 539                 }
 540                 ptr += sz;
 541         }
 542         if (callback && collection && callback->send_event)
 543                 callback->send_event(hsdev, collection->usage,
 544                                 callback->pdev);
 545         spin_unlock_irqrestore(&pdata->lock, flags);
 546
 547         return 1;
 548 }
 549
 550 int sensor_hub_device_open(struct hid_sensor_hub_device *hsdev)
 551 {
 552         int ret = 0;
 553         struct sensor_hub_data *data =  hid_get_drvdata(hsdev->hdev);
 554
 555         mutex_lock(&data->mutex);
 556         if (!data->ref_cnt) {
 557                 ret = hid_hw_open(hsdev->hdev);
 558                 if (ret) {
 559                         hid_err(hsdev->hdev, "failed to open hid device\n");
 560                         mutex_unlock(&data->mutex);
 561                         return ret;
 562                 }
 563         }
 564         data->ref_cnt++;
 565         mutex_unlock(&data->mutex);
 566
 567         return ret;
 568 }
 569 EXPORT_SYMBOL_GPL(sensor_hub_device_open);
 570
 571 void sensor_hub_device_close(struct hid_sensor_hub_device *hsdev)
 572 {
 573         struct sensor_hub_data *data =  hid_get_drvdata(hsdev->hdev);
 574
 575         mutex_lock(&data->mutex);
 576         data->ref_cnt--;
 577         if (!data->ref_cnt)
 578                 hid_hw_close(hsdev->hdev);
 579         mutex_unlock(&data->mutex);
 580 }
 581 EXPORT_SYMBOL_GPL(sensor_hub_device_close);
 582
 583 static __u8 *sensor_hub_report_fixup(struct hid_device *hdev, __u8 *rdesc,
 584                 unsigned int *rsize)
 585 {
 586         /*
 587          * Checks if the report descriptor of Thinkpad Helix 2 has a logical
 588          * minimum for magnetic flux axis greater than the maximum.
 589          */
 590         if (hdev->product == USB_DEVICE_ID_TEXAS_INSTRUMENTS_LENOVO_YOGA &&
 591                 *rsize == 2558 && rdesc[913] == 0x17 && rdesc[914] == 0x40 &&
 592                 rdesc[915] == 0x81 && rdesc[916] == 0x08 &&
 593                 rdesc[917] == 0x00 && rdesc[918] == 0x27 &&
 594                 rdesc[921] == 0x07 && rdesc[922] == 0x00) {
 595                 /* Sets negative logical minimum for mag x, y and z */
 596                 rdesc[914] = rdesc[935] = rdesc[956] = 0xc0;
 597                 rdesc[915] = rdesc[936] = rdesc[957] = 0x7e;
 598                 rdesc[916] = rdesc[937] = rdesc[958] = 0xf7;
 599                 rdesc[917] = rdesc[938] = rdesc[959] = 0xff;
 600         }
 601
 602         return rdesc;
 603 }
 604
 605 static int sensor_hub_probe(struct hid_device *hdev,
 606                                 const struct hid_device_id *id)
 607 {
 608         int ret;
 609         struct sensor_hub_data *sd;
 610         int i;
 611         char *name;
 612         int dev_cnt;
 613         struct hid_sensor_hub_device *hsdev;
 614         struct hid_sensor_hub_device *last_hsdev = NULL;
 615         struct hid_sensor_hub_device *collection_hsdev = NULL;
 616
 617         sd = devm_kzalloc(&hdev->dev, sizeof(*sd), GFP_KERNEL);
 618         if (!sd) {
 619                 hid_err(hdev, "cannot allocate Sensor data\n");
 620                 return -ENOMEM;
 621         }
 622
 623         hid_set_drvdata(hdev, sd);
 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, HID_CONNECT_DEFAULT);
 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");