drivers/hid/hid-sensor-hub.c

   1 /*
   2  * HID Sensors Driver
   3  * Copyright (c) 2012, Intel Corporation.
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms and conditions of the GNU General Public License,
   7  * version 2, as published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  12  * more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along with
  15  * this program; if not, write to the Free Software Foundation, Inc.,
  16  * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
  17  *
  18  */
  19
  20 #include <linux/device.h>
  21 #include <linux/hid.h>
  22 #include <linux/module.h>
  23 #include <linux/slab.h>
  24 #include <linux/mfd/core.h>
  25 #include <linux/list.h>
  26 #include <linux/hid-sensor-ids.h>
  27 #include <linux/hid-sensor-hub.h>
  28 #include "hid-ids.h"
  29
  30 #define HID_SENSOR_HUB_ENUM_QUIRK       0x01
  31
  32 /**
  33  * struct sensor_hub_data - Hold a instance data for a HID hub device
  34  * @hsdev:              Stored hid instance for current hub device.
  35  * @mutex:              Mutex to serialize synchronous request.
  36  * @lock:               Spin lock to protect pending request structure.
  37  * @dyn_callback_list:  Holds callback function
  38  * @dyn_callback_lock:  spin lock to protect callback list
  39  * @hid_sensor_hub_client_devs: Stores all MFD cells for a hub instance.
  40  * @hid_sensor_client_cnt: Number of MFD cells, (no of sensors attached).
  41  * @ref_cnt:            Number of MFD clients have opened this device
  42  */
  43 struct sensor_hub_data {
  44         struct mutex mutex;
  45         spinlock_t lock;
  46         struct list_head dyn_callback_list;
  47         spinlock_t dyn_callback_lock;
  48         struct mfd_cell *hid_sensor_hub_client_devs;
  49         int hid_sensor_client_cnt;
  50         unsigned long quirks;
  51         int ref_cnt;
  52 };
  53
  54 /**
  55  * struct hid_sensor_hub_callbacks_list - Stores callback list
  56  * @list:               list head.
  57  * @usage_id:           usage id for a physical device.
  58  * @usage_callback:     Stores registered callback functions.
  59  * @priv:               Private data for a physical device.
  60  */
  61 struct hid_sensor_hub_callbacks_list {
  62         struct list_head list;
  63         u32 usage_id;
  64         struct hid_sensor_hub_device *hsdev;
  65         struct hid_sensor_hub_callbacks *usage_callback;
  66         void *priv;
  67 };
  68
  69 static struct hid_report *sensor_hub_report(int id, struct hid_device *hdev,
  70                                                 int dir)
  71 {
  72         struct hid_report *report;
  73
  74         list_for_each_entry(report, &hdev->report_enum[dir].report_list, list) {
  75                 if (report->id == id)
  76                         return report;
  77         }
  78         hid_warn(hdev, "No report with id 0x%x found\n", id);
  79
  80         return NULL;
  81 }
  82
  83 static int sensor_hub_get_physical_device_count(struct hid_device *hdev)
  84 {
  85         int i;
  86         int count = 0;
  87
  88         for (i = 0; i < hdev->maxcollection; ++i) {
  89                 struct hid_collection *collection = &hdev->collection[i];
  90                 if (collection->type == HID_COLLECTION_PHYSICAL ||
  91                     collection->type == HID_COLLECTION_APPLICATION)
  92                         ++count;
  93         }
  94
  95         return count;
  96 }
  97
  98 static void sensor_hub_fill_attr_info(
  99                 struct hid_sensor_hub_attribute_info *info,
 100                 s32 index, s32 report_id, struct hid_field *field)
 101 {
 102         info->index = index;
 103         info->report_id = report_id;
 104         info->units = field->unit;
 105         info->unit_expo = field->unit_exponent;
 106         info->size = (field->report_size * field->report_count)/8;
 107         info->logical_minimum = field->logical_minimum;
 108         info->logical_maximum = field->logical_maximum;
 109 }
 110
 111 static struct hid_sensor_hub_callbacks *sensor_hub_get_callback(
 112                                         struct hid_device *hdev,
 113                                         u32 usage_id,
 114                                         int collection_index,
 115                                         struct hid_sensor_hub_device **hsdev,
 116                                         void **priv)
 117 {
 118         struct hid_sensor_hub_callbacks_list *callback;
 119         struct sensor_hub_data *pdata = hid_get_drvdata(hdev);
 120         unsigned long flags;
 121
 122         spin_lock_irqsave(&pdata->dyn_callback_lock, flags);
 123         list_for_each_entry(callback, &pdata->dyn_callback_list, list)
 124                 if ((callback->usage_id == usage_id ||
 125                      callback->usage_id == HID_USAGE_SENSOR_COLLECTION) &&
 126                         (collection_index >=
 127                                 callback->hsdev->start_collection_index) &&
 128                         (collection_index <
 129                                 callback->hsdev->end_collection_index)) {
 130                         *priv = callback->priv;
 131                         *hsdev = callback->hsdev;
 132                         spin_unlock_irqrestore(&pdata->dyn_callback_lock,
 133                                                flags);
 134                         return callback->usage_callback;
 135                 }
 136         spin_unlock_irqrestore(&pdata->dyn_callback_lock, flags);
 137
 138         return NULL;
 139 }
 140
 141 int sensor_hub_register_callback(struct hid_sensor_hub_device *hsdev,
 142                         u32 usage_id,
 143                         struct hid_sensor_hub_callbacks *usage_callback)
 144 {
 145         struct hid_sensor_hub_callbacks_list *callback;
 146         struct sensor_hub_data *pdata = hid_get_drvdata(hsdev->hdev);
 147         unsigned long flags;
 148
 149         spin_lock_irqsave(&pdata->dyn_callback_lock, flags);
 150         list_for_each_entry(callback, &pdata->dyn_callback_list, list)
 151                 if (callback->usage_id == usage_id &&
 152                                                 callback->hsdev == hsdev) {
 153                         spin_unlock_irqrestore(&pdata->dyn_callback_lock, flags);
 154                         return -EINVAL;
 155                 }
 156         callback = kzalloc(sizeof(*callback), GFP_ATOMIC);
 157         if (!callback) {
 158                 spin_unlock_irqrestore(&pdata->dyn_callback_lock, flags);
 159                 return -ENOMEM;
 160         }
 161         callback->hsdev = hsdev;
 162         callback->usage_callback = usage_callback;
 163         callback->usage_id = usage_id;
 164         callback->priv = NULL;
 165         /*
 166          * If there is a handler registered for the collection type, then
 167          * it will handle all reports for sensors in this collection. If
 168          * there is also an individual sensor handler registration, then
 169          * we want to make sure that the reports are directed to collection
 170          * handler, as this may be a fusion sensor. So add collection handlers
 171          * to the beginning of the list, so that they are matched first.
 172          */
 173         if (usage_id == HID_USAGE_SENSOR_COLLECTION)
 174                 list_add(&callback->list, &pdata->dyn_callback_list);
 175         else
 176                 list_add_tail(&callback->list, &pdata->dyn_callback_list);
 177         spin_unlock_irqrestore(&pdata->dyn_callback_lock, flags);
 178
 179         return 0;
 180 }
 181 EXPORT_SYMBOL_GPL(sensor_hub_register_callback);
 182
 183 int sensor_hub_remove_callback(struct hid_sensor_hub_device *hsdev,
 184                                 u32 usage_id)
 185 {
 186         struct hid_sensor_hub_callbacks_list *callback;
 187         struct sensor_hub_data *pdata = hid_get_drvdata(hsdev->hdev);
 188         unsigned long flags;
 189
 190         spin_lock_irqsave(&pdata->dyn_callback_lock, flags);
 191         list_for_each_entry(callback, &pdata->dyn_callback_list, list)
 192                 if (callback->usage_id == usage_id &&
 193                                                 callback->hsdev == hsdev) {
 194                         list_del(&callback->list);
 195                         kfree(callback);
 196                         break;
 197                 }
 198         spin_unlock_irqrestore(&pdata->dyn_callback_lock, flags);
 199
 200         return 0;
 201 }
 202 EXPORT_SYMBOL_GPL(sensor_hub_remove_callback);
 203
 204 int sensor_hub_set_feature(struct hid_sensor_hub_device *hsdev, u32 report_id,
 205                            u32 field_index, int buffer_size, void *buffer)
 206 {
 207         struct hid_report *report;
 208         struct sensor_hub_data *data = hid_get_drvdata(hsdev->hdev);
 209         __s32 *buf32 = buffer;
 210         int i = 0;
 211         int remaining_bytes;
 212         __s32 value;
 213         int ret = 0;
 214
 215         mutex_lock(&data->mutex);
 216         report = sensor_hub_report(report_id, hsdev->hdev, HID_FEATURE_REPORT);
 217         if (!report || (field_index >= report->maxfield)) {
 218                 ret = -EINVAL;
 219                 goto done_proc;
 220         }
 221
 222         remaining_bytes = buffer_size % sizeof(__s32);
 223         buffer_size = buffer_size / sizeof(__s32);
 224         if (buffer_size) {
 225                 for (i = 0; i < buffer_size; ++i) {
 226                         ret = hid_set_field(report->field[field_index], i,
 227                                             (__force __s32)cpu_to_le32(*buf32));
 228                         if (ret)
 229                                 goto done_proc;
 230
 231                         ++buf32;
 232                 }
 233         }
 234         if (remaining_bytes) {
 235                 value = 0;
 236                 memcpy(&value, (u8 *)buf32, remaining_bytes);
 237                 ret = hid_set_field(report->field[field_index], i,
 238                                     (__force __s32)cpu_to_le32(value));
 239                 if (ret)
 240                         goto done_proc;
 241         }
 242         hid_hw_request(hsdev->hdev, report, HID_REQ_SET_REPORT);
 243         hid_hw_wait(hsdev->hdev);
 244
 245 done_proc:
 246         mutex_unlock(&data->mutex);
 247
 248         return ret;
 249 }
 250 EXPORT_SYMBOL_GPL(sensor_hub_set_feature);
 251
 252 int sensor_hub_get_feature(struct hid_sensor_hub_device *hsdev, u32 report_id,
 253                            u32 field_index, int buffer_size, void *buffer)
 254 {
 255         struct hid_report *report;
 256         struct sensor_hub_data *data = hid_get_drvdata(hsdev->hdev);
 257         int report_size;
 258         int ret = 0;
 259         u8 *val_ptr;
 260         int buffer_index = 0;
 261         int i;
 262
 263         memset(buffer, 0, buffer_size);
 264
 265         mutex_lock(&data->mutex);
 266         report = sensor_hub_report(report_id, hsdev->hdev, HID_FEATURE_REPORT);
 267         if (!report || (field_index >= report->maxfield) ||
 268             report->field[field_index]->report_count < 1) {
 269                 ret = -EINVAL;
 270                 goto done_proc;
 271         }
 272         hid_hw_request(hsdev->hdev, report, HID_REQ_GET_REPORT);
 273         hid_hw_wait(hsdev->hdev);
 274
 275         /* calculate number of bytes required to read this field */
 276         report_size = DIV_ROUND_UP(report->field[field_index]->report_size,
 277                                    8) *
 278                                    report->field[field_index]->report_count;
 279         if (!report_size) {
 280                 ret = -EINVAL;
 281                 goto done_proc;
 282         }
 283         ret = min(report_size, buffer_size);
 284
 285         val_ptr = (u8 *)report->field[field_index]->value;
 286         for (i = 0; i < report->field[field_index]->report_count; ++i) {
 287                 if (buffer_index >= ret)
 288                         break;
 289
 290                 memcpy(&((u8 *)buffer)[buffer_index], val_ptr,
 291                        report->field[field_index]->report_size / 8);
 292                 val_ptr += sizeof(__s32);
 293                 buffer_index += (report->field[field_index]->report_size / 8);
 294         }
 295
 296 done_proc:
 297         mutex_unlock(&data->mutex);
 298
 299         return ret;
 300 }
 301 EXPORT_SYMBOL_GPL(sensor_hub_get_feature);
 302
 303
 304 int sensor_hub_input_attr_get_raw_value(struct hid_sensor_hub_device *hsdev,
 305                                         u32 usage_id,
 306                                         u32 attr_usage_id, u32 report_id,
 307                                         enum sensor_hub_read_flags flag,
 308                                         bool is_signed)
 309 {
 310         struct sensor_hub_data *data = hid_get_drvdata(hsdev->hdev);
 311         unsigned long flags;
 312         struct hid_report *report;
 313         int ret_val = 0;
 314
 315         report = sensor_hub_report(report_id, hsdev->hdev,
 316                                    HID_INPUT_REPORT);
 317         if (!report)
 318                 return -EINVAL;
 319
 320         mutex_lock(hsdev->mutex_ptr);
 321         if (flag == SENSOR_HUB_SYNC) {
 322                 memset(&hsdev->pending, 0, sizeof(hsdev->pending));
 323                 init_completion(&hsdev->pending.ready);
 324                 hsdev->pending.usage_id = usage_id;
 325                 hsdev->pending.attr_usage_id = attr_usage_id;
 326                 hsdev->pending.raw_size = 0;
 327
 328                 spin_lock_irqsave(&data->lock, flags);
 329                 hsdev->pending.status = true;
 330                 spin_unlock_irqrestore(&data->lock, flags);
 331         }
 332         mutex_lock(&data->mutex);
 333         hid_hw_request(hsdev->hdev, report, HID_REQ_GET_REPORT);
 334         mutex_unlock(&data->mutex);
 335         if (flag == SENSOR_HUB_SYNC) {
 336                 wait_for_completion_interruptible_timeout(
 337                                                 &hsdev->pending.ready, HZ*5);
 338                 switch (hsdev->pending.raw_size) {
 339                 case 1:
 340                         if (is_signed)
 341                                 ret_val = *(s8 *)hsdev->pending.raw_data;
 342                         else
 343                                 ret_val = *(u8 *)hsdev->pending.raw_data;
 344                         break;
 345                 case 2:
 346                         if (is_signed)
 347                                 ret_val = *(s16 *)hsdev->pending.raw_data;
 348                         else
 349                                 ret_val = *(u16 *)hsdev->pending.raw_data;
 350                         break;
 351                 case 4:
 352                         ret_val = *(u32 *)hsdev->pending.raw_data;
 353                         break;
 354                 default:
 355                         ret_val = 0;
 356                 }
 357                 kfree(hsdev->pending.raw_data);
 358                 hsdev->pending.status = false;
 359         }
 360         mutex_unlock(hsdev->mutex_ptr);
 361
 362         return ret_val;
 363 }
 364 EXPORT_SYMBOL_GPL(sensor_hub_input_attr_get_raw_value);
 365
 366 int hid_sensor_get_usage_index(struct hid_sensor_hub_device *hsdev,
 367                                 u32 report_id, int field_index, u32 usage_id)
 368 {
 369         struct hid_report *report;
 370         struct hid_field *field;
 371         int i;
 372
 373         report = sensor_hub_report(report_id, hsdev->hdev, HID_FEATURE_REPORT);
 374         if (!report || (field_index >= report->maxfield))
 375                 goto done_proc;
 376
 377         field = report->field[field_index];
 378         for (i = 0; i < field->maxusage; ++i) {
 379                 if (field->usage[i].hid == usage_id)
 380                         return field->usage[i].usage_index;
 381         }
 382
 383 done_proc:
 384         return -EINVAL;
 385 }
 386 EXPORT_SYMBOL_GPL(hid_sensor_get_usage_index);
 387
 388 int sensor_hub_input_get_attribute_info(struct hid_sensor_hub_device *hsdev,
 389                                 u8 type,
 390                                 u32 usage_id,
 391                                 u32 attr_usage_id,
 392                                 struct hid_sensor_hub_attribute_info *info)
 393 {
 394         int ret = -1;
 395         int i;
 396         struct hid_report *report;
 397         struct hid_field *field;
 398         struct hid_report_enum *report_enum;
 399         struct hid_device *hdev = hsdev->hdev;
 400
 401         /* Initialize with defaults */
 402         info->usage_id = usage_id;
 403         info->attrib_id = attr_usage_id;
 404         info->report_id = -1;
 405         info->index = -1;
 406         info->units = -1;
 407         info->unit_expo = -1;
 408
 409         report_enum = &hdev->report_enum[type];
 410         list_for_each_entry(report, &report_enum->report_list, list) {
 411                 for (i = 0; i < report->maxfield; ++i) {
 412                         field = report->field[i];
 413                         if (field->maxusage) {
 414                                 if (field->physical == usage_id &&
 415                                         (field->logical == attr_usage_id ||
 416                                         field->usage[0].hid ==
 417                                                         attr_usage_id) &&
 418                                         (field->usage[0].collection_index >=
 419                                         hsdev->start_collection_index) &&
 420                                         (field->usage[0].collection_index <
 421                                         hsdev->end_collection_index)) {
 422
 423                                         sensor_hub_fill_attr_info(info, i,
 424                                                                 report->id,
 425                                                                 field);
 426                                         ret = 0;
 427                                         break;
 428                                 }
 429                         }
 430                 }
 431
 432         }
 433
 434         return ret;
 435 }
 436 EXPORT_SYMBOL_GPL(sensor_hub_input_get_attribute_info);
 437
 438 #ifdef CONFIG_PM
 439 static int sensor_hub_suspend(struct hid_device *hdev, pm_message_t message)
 440 {
 441         struct sensor_hub_data *pdata = hid_get_drvdata(hdev);
 442         struct hid_sensor_hub_callbacks_list *callback;
 443         unsigned long flags;
 444
 445         hid_dbg(hdev, " sensor_hub_suspend\n");
 446         spin_lock_irqsave(&pdata->dyn_callback_lock, flags);
 447         list_for_each_entry(callback, &pdata->dyn_callback_list, list) {
 448                 if (callback->usage_callback->suspend)
 449                         callback->usage_callback->suspend(
 450                                         callback->hsdev, callback->priv);
 451         }
 452         spin_unlock_irqrestore(&pdata->dyn_callback_lock, flags);
 453
 454         return 0;
 455 }
 456
 457 static int sensor_hub_resume(struct hid_device *hdev)
 458 {
 459         struct sensor_hub_data *pdata = hid_get_drvdata(hdev);
 460         struct hid_sensor_hub_callbacks_list *callback;
 461         unsigned long flags;
 462
 463         hid_dbg(hdev, " sensor_hub_resume\n");
 464         spin_lock_irqsave(&pdata->dyn_callback_lock, flags);
 465         list_for_each_entry(callback, &pdata->dyn_callback_list, list) {
 466                 if (callback->usage_callback->resume)
 467                         callback->usage_callback->resume(
 468                                         callback->hsdev, callback->priv);
 469         }
 470         spin_unlock_irqrestore(&pdata->dyn_callback_lock, flags);
 471
 472         return 0;
 473 }
 474
 475 static int sensor_hub_reset_resume(struct hid_device *hdev)
 476 {
 477         return 0;
 478 }
 479 #endif
 480
 481 /*
 482  * Handle raw report as sent by device
 483  */
 484 static int sensor_hub_raw_event(struct hid_device *hdev,
 485                 struct hid_report *report, u8 *raw_data, int size)
 486 {
 487         int i;
 488         u8 *ptr;
 489         int sz;
 490         struct sensor_hub_data *pdata = hid_get_drvdata(hdev);
 491         unsigned long flags;
 492         struct hid_sensor_hub_callbacks *callback = NULL;
 493         struct hid_collection *collection = NULL;
 494         void *priv = NULL;
 495         struct hid_sensor_hub_device *hsdev = NULL;
 496
 497         hid_dbg(hdev, "sensor_hub_raw_event report id:0x%x size:%d type:%d\n",
 498                          report->id, size, report->type);
 499         hid_dbg(hdev, "maxfield:%d\n", report->maxfield);
 500         if (report->type != HID_INPUT_REPORT)
 501                 return 1;
 502
 503         ptr = raw_data;
 504         if (report->id)
 505                 ptr++; /* Skip report id */
 506
 507         spin_lock_irqsave(&pdata->lock, flags);
 508
 509         for (i = 0; i < report->maxfield; ++i) {
 510                 hid_dbg(hdev, "%d collection_index:%x hid:%x sz:%x\n",
 511                                 i, report->field[i]->usage->collection_index,
 512                                 report->field[i]->usage->hid,
 513                                 (report->field[i]->report_size *
 514                                         report->field[i]->report_count)/8);
 515                 sz = (report->field[i]->report_size *
 516                                         report->field[i]->report_count)/8;
 517                 collection = &hdev->collection[
 518                                 report->field[i]->usage->collection_index];
 519                 hid_dbg(hdev, "collection->usage %x\n",
 520                                         collection->usage);
 521
 522                 callback = sensor_hub_get_callback(hdev,
 523                                 report->field[i]->physical,
 524                                 report->field[i]->usage[0].collection_index,
 525                                 &hsdev, &priv);
 526                 if (!callback) {
 527                         ptr += sz;
 528                         continue;
 529                 }
 530                 if (hsdev->pending.status && (hsdev->pending.attr_usage_id ==
 531                                               report->field[i]->usage->hid ||
 532                                               hsdev->pending.attr_usage_id ==
 533                                               report->field[i]->logical)) {
 534                         hid_dbg(hdev, "data was pending ...\n");
 535                         hsdev->pending.raw_data = kmemdup(ptr, sz, GFP_ATOMIC);
 536                         if (hsdev->pending.raw_data)
 537                                 hsdev->pending.raw_size = sz;
 538                         else
 539                                 hsdev->pending.raw_size = 0;
 540                         complete(&hsdev->pending.ready);
 541                 }
 542                 if (callback->capture_sample) {
 543                         if (report->field[i]->logical)
 544                                 callback->capture_sample(hsdev,
 545                                         report->field[i]->logical, sz, ptr,
 546                                         callback->pdev);
 547                         else
 548                                 callback->capture_sample(hsdev,
 549                                         report->field[i]->usage->hid, sz, ptr,
 550                                         callback->pdev);
 551                 }
 552                 ptr += sz;
 553         }
 554         if (callback && collection && callback->send_event)
 555                 callback->send_event(hsdev, collection->usage,
 556                                 callback->pdev);
 557         spin_unlock_irqrestore(&pdata->lock, flags);
 558
 559         return 1;
 560 }
 561
 562 int sensor_hub_device_open(struct hid_sensor_hub_device *hsdev)
 563 {
 564         int ret = 0;
 565         struct sensor_hub_data *data =  hid_get_drvdata(hsdev->hdev);
 566
 567         mutex_lock(&data->mutex);
 568         if (!data->ref_cnt) {
 569                 ret = hid_hw_open(hsdev->hdev);
 570                 if (ret) {
 571                         hid_err(hsdev->hdev, "failed to open hid device\n");
 572                         mutex_unlock(&data->mutex);
 573                         return ret;
 574                 }
 575         }
 576         data->ref_cnt++;
 577         mutex_unlock(&data->mutex);
 578
 579         return ret;
 580 }
 581 EXPORT_SYMBOL_GPL(sensor_hub_device_open);
 582
 583 void sensor_hub_device_close(struct hid_sensor_hub_device *hsdev)
 584 {
 585         struct sensor_hub_data *data =  hid_get_drvdata(hsdev->hdev);
 586
 587         mutex_lock(&data->mutex);
 588         data->ref_cnt--;
 589         if (!data->ref_cnt)
 590                 hid_hw_close(hsdev->hdev);
 591         mutex_unlock(&data->mutex);
 592 }
 593 EXPORT_SYMBOL_GPL(sensor_hub_device_close);
 594
 595 static __u8 *sensor_hub_report_fixup(struct hid_device *hdev, __u8 *rdesc,
 596                 unsigned int *rsize)
 597 {
 598         /*
 599          * Checks if the report descriptor of Thinkpad Helix 2 has a logical
 600          * minimum for magnetic flux axis greater than the maximum.
 601          */
 602         if (hdev->product == USB_DEVICE_ID_TEXAS_INSTRUMENTS_LENOVO_YOGA &&
 603                 *rsize == 2558 && rdesc[913] == 0x17 && rdesc[914] == 0x40 &&
 604                 rdesc[915] == 0x81 && rdesc[916] == 0x08 &&
 605                 rdesc[917] == 0x00 && rdesc[918] == 0x27 &&
 606                 rdesc[921] == 0x07 && rdesc[922] == 0x00) {
 607                 /* Sets negative logical minimum for mag x, y and z */
 608                 rdesc[914] = rdesc[935] = rdesc[956] = 0xc0;
 609                 rdesc[915] = rdesc[936] = rdesc[957] = 0x7e;
 610                 rdesc[916] = rdesc[937] = rdesc[958] = 0xf7;
 611                 rdesc[917] = rdesc[938] = rdesc[959] = 0xff;
 612         }
 613
 614         return rdesc;
 615 }
 616
 617 static int sensor_hub_probe(struct hid_device *hdev,
 618                                 const struct hid_device_id *id)
 619 {
 620         int ret;
 621         struct sensor_hub_data *sd;
 622         int i;
 623         char *name;
 624         int dev_cnt;
 625         struct hid_sensor_hub_device *hsdev;
 626         struct hid_sensor_hub_device *last_hsdev = NULL;
 627         struct hid_sensor_hub_device *collection_hsdev = NULL;
 628
 629         sd = devm_kzalloc(&hdev->dev, sizeof(*sd), GFP_KERNEL);
 630         if (!sd) {
 631                 hid_err(hdev, "cannot allocate Sensor data\n");
 632                 return -ENOMEM;
 633         }
 634
 635         hid_set_drvdata(hdev, sd);
 636         sd->quirks = id->driver_data;
 637
 638         spin_lock_init(&sd->lock);
 639         spin_lock_init(&sd->dyn_callback_lock);
 640         mutex_init(&sd->mutex);
 641         ret = hid_parse(hdev);
 642         if (ret) {
 643                 hid_err(hdev, "parse failed\n");
 644                 return ret;
 645         }
 646         INIT_LIST_HEAD(&hdev->inputs);
 647
 648         ret = hid_hw_start(hdev, 0);
 649         if (ret) {
 650                 hid_err(hdev, "hw start failed\n");
 651                 return ret;
 652         }
 653         INIT_LIST_HEAD(&sd->dyn_callback_list);
 654         sd->hid_sensor_client_cnt = 0;
 655
 656         dev_cnt = sensor_hub_get_physical_device_count(hdev);
 657         if (dev_cnt > HID_MAX_PHY_DEVICES) {
 658                 hid_err(hdev, "Invalid Physical device count\n");
 659                 ret = -EINVAL;
 660                 goto err_stop_hw;
 661         }
 662         sd->hid_sensor_hub_client_devs = devm_kzalloc(&hdev->dev, dev_cnt *
 663                                                       sizeof(struct mfd_cell),
 664                                                       GFP_KERNEL);
 665         if (sd->hid_sensor_hub_client_devs == NULL) {
 666                 hid_err(hdev, "Failed to allocate memory for mfd cells\n");
 667                 ret = -ENOMEM;
 668                 goto err_stop_hw;
 669         }
 670
 671         for (i = 0; i < hdev->maxcollection; ++i) {
 672                 struct hid_collection *collection = &hdev->collection[i];
 673
 674                 if (collection->type == HID_COLLECTION_PHYSICAL ||
 675                     collection->type == HID_COLLECTION_APPLICATION) {
 676
 677                         hsdev = devm_kzalloc(&hdev->dev, sizeof(*hsdev),
 678                                              GFP_KERNEL);
 679                         if (!hsdev) {
 680                                 hid_err(hdev, "cannot allocate hid_sensor_hub_device\n");
 681                                 ret = -ENOMEM;
 682                                 goto err_stop_hw;
 683                         }
 684                         hsdev->hdev = hdev;
 685                         hsdev->vendor_id = hdev->vendor;
 686                         hsdev->product_id = hdev->product;
 687                         hsdev->usage = collection->usage;
 688                         hsdev->mutex_ptr = devm_kzalloc(&hdev->dev,
 689                                                         sizeof(struct mutex),
 690                                                         GFP_KERNEL);
 691                         if (!hsdev->mutex_ptr) {
 692                                 ret = -ENOMEM;
 693                                 goto err_stop_hw;
 694                         }
 695                         mutex_init(hsdev->mutex_ptr);
 696                         hsdev->start_collection_index = i;
 697                         if (last_hsdev)
 698                                 last_hsdev->end_collection_index = i;
 699                         last_hsdev = hsdev;
 700                         name = devm_kasprintf(&hdev->dev, GFP_KERNEL,
 701                                               "HID-SENSOR-%x",
 702                                               collection->usage);
 703                         if (name == NULL) {
 704                                 hid_err(hdev, "Failed MFD device name\n");
 705                                 ret = -ENOMEM;
 706                                 goto err_stop_hw;
 707                         }
 708                         sd->hid_sensor_hub_client_devs[
 709                                 sd->hid_sensor_client_cnt].name = name;
 710                         sd->hid_sensor_hub_client_devs[
 711                                 sd->hid_sensor_client_cnt].platform_data =
 712                                                         hsdev;
 713                         sd->hid_sensor_hub_client_devs[
 714                                 sd->hid_sensor_client_cnt].pdata_size =
 715                                                         sizeof(*hsdev);
 716                         hid_dbg(hdev, "Adding %s:%d\n", name,
 717                                         hsdev->start_collection_index);
 718                         sd->hid_sensor_client_cnt++;
 719                         if (collection_hsdev)
 720                                 collection_hsdev->end_collection_index = i;
 721                         if (collection->type == HID_COLLECTION_APPLICATION &&
 722                             collection->usage == HID_USAGE_SENSOR_COLLECTION)
 723                                 collection_hsdev = hsdev;
 724                 }
 725         }
 726         if (last_hsdev)
 727                 last_hsdev->end_collection_index = i;
 728         if (collection_hsdev)
 729                 collection_hsdev->end_collection_index = i;
 730
 731         ret = mfd_add_hotplug_devices(&hdev->dev,
 732                         sd->hid_sensor_hub_client_devs,
 733                         sd->hid_sensor_client_cnt);
 734         if (ret < 0)
 735                 goto err_stop_hw;
 736
 737         return ret;
 738
 739 err_stop_hw:
 740         hid_hw_stop(hdev);
 741
 742         return ret;
 743 }
 744
 745 static void sensor_hub_remove(struct hid_device *hdev)
 746 {
 747         struct sensor_hub_data *data = hid_get_drvdata(hdev);
 748         unsigned long flags;
 749         int i;
 750
 751         hid_dbg(hdev, " hardware removed\n");
 752         hid_hw_close(hdev);
 753         hid_hw_stop(hdev);
 754         spin_lock_irqsave(&data->lock, flags);
 755         for (i = 0; i < data->hid_sensor_client_cnt; ++i) {
 756                 struct hid_sensor_hub_device *hsdev =
 757                         data->hid_sensor_hub_client_devs[i].platform_data;
 758                 if (hsdev->pending.status)
 759                         complete(&hsdev->pending.ready);
 760         }
 761         spin_unlock_irqrestore(&data->lock, flags);
 762         mfd_remove_devices(&hdev->dev);
 763         hid_set_drvdata(hdev, NULL);
 764         mutex_destroy(&data->mutex);
 765 }
 766
 767 static const struct hid_device_id sensor_hub_devices[] = {
 768         { HID_DEVICE(HID_BUS_ANY, HID_GROUP_SENSOR_HUB, HID_ANY_ID,
 769                      HID_ANY_ID) },
 770         { }
 771 };
 772 MODULE_DEVICE_TABLE(hid, sensor_hub_devices);
 773
 774 static struct hid_driver sensor_hub_driver = {
 775         .name = "hid-sensor-hub",
 776         .id_table = sensor_hub_devices,
 777         .probe = sensor_hub_probe,
 778         .remove = sensor_hub_remove,
 779         .raw_event = sensor_hub_raw_event,
 780         .report_fixup = sensor_hub_report_fixup,
 781 #ifdef CONFIG_PM
 782         .suspend = sensor_hub_suspend,
 783         .resume = sensor_hub_resume,
 784         .reset_resume = sensor_hub_reset_resume,
 785 #endif
 786 };
 787 module_hid_driver(sensor_hub_driver);
 788
 789 MODULE_DESCRIPTION("HID Sensor Hub driver");
 790 MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@intel.com>");
 791 MODULE_LICENSE("GPL");