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