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                         hid_set_field(report->field[field_index], i,
 227                                       (__force __s32)cpu_to_le32(*buf32));
 228                         ++buf32;
 229                 }
 230         }
 231         if (remaining_bytes) {
 232                 value = 0;
 233                 memcpy(&value, (u8 *)buf32, remaining_bytes);
 234                 hid_set_field(report->field[field_index], i,
 235                               (__force __s32)cpu_to_le32(value));
 236         }
 237         hid_hw_request(hsdev->hdev, report, HID_REQ_SET_REPORT);
 238         hid_hw_wait(hsdev->hdev);
 239
 240 done_proc:
 241         mutex_unlock(&data->mutex);
 242
 243         return ret;
 244 }
 245 EXPORT_SYMBOL_GPL(sensor_hub_set_feature);
 246
 247 int sensor_hub_get_feature(struct hid_sensor_hub_device *hsdev, u32 report_id,
 248                            u32 field_index, int buffer_size, void *buffer)
 249 {
 250         struct hid_report *report;
 251         struct sensor_hub_data *data = hid_get_drvdata(hsdev->hdev);
 252         int report_size;
 253         int ret = 0;
 254         u8 *val_ptr;
 255         int buffer_index = 0;
 256         int i;
 257
 258         memset(buffer, 0, buffer_size);
 259
 260         mutex_lock(&data->mutex);
 261         report = sensor_hub_report(report_id, hsdev->hdev, HID_FEATURE_REPORT);
 262         if (!report || (field_index >= report->maxfield) ||
 263             report->field[field_index]->report_count < 1) {
 264                 ret = -EINVAL;
 265                 goto done_proc;
 266         }
 267         hid_hw_request(hsdev->hdev, report, HID_REQ_GET_REPORT);
 268         hid_hw_wait(hsdev->hdev);
 269
 270         /* calculate number of bytes required to read this field */
 271         report_size = DIV_ROUND_UP(report->field[field_index]->report_size,
 272                                    8) *
 273                                    report->field[field_index]->report_count;
 274         if (!report_size) {
 275                 ret = -EINVAL;
 276                 goto done_proc;
 277         }
 278         ret = min(report_size, buffer_size);
 279
 280         val_ptr = (u8 *)report->field[field_index]->value;
 281         for (i = 0; i < report->field[field_index]->report_count; ++i) {
 282                 if (buffer_index >= ret)
 283                         break;
 284
 285                 memcpy(&((u8 *)buffer)[buffer_index], val_ptr,
 286                        report->field[field_index]->report_size / 8);
 287                 val_ptr += sizeof(__s32);
 288                 buffer_index += (report->field[field_index]->report_size / 8);
 289         }
 290
 291 done_proc:
 292         mutex_unlock(&data->mutex);
 293
 294         return ret;
 295 }
 296 EXPORT_SYMBOL_GPL(sensor_hub_get_feature);
 297
 298
 299 int sensor_hub_input_attr_get_raw_value(struct hid_sensor_hub_device *hsdev,
 300                                         u32 usage_id,
 301                                         u32 attr_usage_id, u32 report_id,
 302                                         enum sensor_hub_read_flags flag,
 303                                         bool is_signed)
 304 {
 305         struct sensor_hub_data *data = hid_get_drvdata(hsdev->hdev);
 306         unsigned long flags;
 307         struct hid_report *report;
 308         int ret_val = 0;
 309
 310         report = sensor_hub_report(report_id, hsdev->hdev,
 311                                    HID_INPUT_REPORT);
 312         if (!report)
 313                 return -EINVAL;
 314
 315         mutex_lock(hsdev->mutex_ptr);
 316         if (flag == SENSOR_HUB_SYNC) {
 317                 memset(&hsdev->pending, 0, sizeof(hsdev->pending));
 318                 init_completion(&hsdev->pending.ready);
 319                 hsdev->pending.usage_id = usage_id;
 320                 hsdev->pending.attr_usage_id = attr_usage_id;
 321                 hsdev->pending.raw_size = 0;
 322
 323                 spin_lock_irqsave(&data->lock, flags);
 324                 hsdev->pending.status = true;
 325                 spin_unlock_irqrestore(&data->lock, flags);
 326         }
 327         mutex_lock(&data->mutex);
 328         hid_hw_request(hsdev->hdev, report, HID_REQ_GET_REPORT);
 329         mutex_unlock(&data->mutex);
 330         if (flag == SENSOR_HUB_SYNC) {
 331                 wait_for_completion_interruptible_timeout(
 332                                                 &hsdev->pending.ready, HZ*5);
 333                 switch (hsdev->pending.raw_size) {
 334                 case 1:
 335                         if (is_signed)
 336                                 ret_val = *(s8 *)hsdev->pending.raw_data;
 337                         else
 338                                 ret_val = *(u8 *)hsdev->pending.raw_data;
 339                         break;
 340                 case 2:
 341                         if (is_signed)
 342                                 ret_val = *(s16 *)hsdev->pending.raw_data;
 343                         else
 344                                 ret_val = *(u16 *)hsdev->pending.raw_data;
 345                         break;
 346                 case 4:
 347                         ret_val = *(u32 *)hsdev->pending.raw_data;
 348                         break;
 349                 default:
 350                         ret_val = 0;
 351                 }
 352                 kfree(hsdev->pending.raw_data);
 353                 hsdev->pending.status = false;
 354         }
 355         mutex_unlock(hsdev->mutex_ptr);
 356
 357         return ret_val;
 358 }
 359 EXPORT_SYMBOL_GPL(sensor_hub_input_attr_get_raw_value);
 360
 361 int hid_sensor_get_usage_index(struct hid_sensor_hub_device *hsdev,
 362                                 u32 report_id, int field_index, u32 usage_id)
 363 {
 364         struct hid_report *report;
 365         struct hid_field *field;
 366         int i;
 367
 368         report = sensor_hub_report(report_id, hsdev->hdev, HID_FEATURE_REPORT);
 369         if (!report || (field_index >= report->maxfield))
 370                 goto done_proc;
 371
 372         field = report->field[field_index];
 373         for (i = 0; i < field->maxusage; ++i) {
 374                 if (field->usage[i].hid == usage_id)
 375                         return field->usage[i].usage_index;
 376         }
 377
 378 done_proc:
 379         return -EINVAL;
 380 }
 381 EXPORT_SYMBOL_GPL(hid_sensor_get_usage_index);
 382
 383 int sensor_hub_input_get_attribute_info(struct hid_sensor_hub_device *hsdev,
 384                                 u8 type,
 385                                 u32 usage_id,
 386                                 u32 attr_usage_id,
 387                                 struct hid_sensor_hub_attribute_info *info)
 388 {
 389         int ret = -1;
 390         int i;
 391         struct hid_report *report;
 392         struct hid_field *field;
 393         struct hid_report_enum *report_enum;
 394         struct hid_device *hdev = hsdev->hdev;
 395
 396         /* Initialize with defaults */
 397         info->usage_id = usage_id;
 398         info->attrib_id = attr_usage_id;
 399         info->report_id = -1;
 400         info->index = -1;
 401         info->units = -1;
 402         info->unit_expo = -1;
 403
 404         report_enum = &hdev->report_enum[type];
 405         list_for_each_entry(report, &report_enum->report_list, list) {
 406                 for (i = 0; i < report->maxfield; ++i) {
 407                         field = report->field[i];
 408                         if (field->maxusage) {
 409                                 if (field->physical == usage_id &&
 410                                         (field->logical == attr_usage_id ||
 411                                         field->usage[0].hid ==
 412                                                         attr_usage_id) &&
 413                                         (field->usage[0].collection_index >=
 414                                         hsdev->start_collection_index) &&
 415                                         (field->usage[0].collection_index <
 416                                         hsdev->end_collection_index)) {
 417
 418                                         sensor_hub_fill_attr_info(info, i,
 419                                                                 report->id,
 420                                                                 field);
 421                                         ret = 0;
 422                                         break;
 423                                 }
 424                         }
 425                 }
 426
 427         }
 428
 429         return ret;
 430 }
 431 EXPORT_SYMBOL_GPL(sensor_hub_input_get_attribute_info);
 432
 433 #ifdef CONFIG_PM
 434 static int sensor_hub_suspend(struct hid_device *hdev, pm_message_t message)
 435 {
 436         struct sensor_hub_data *pdata = hid_get_drvdata(hdev);
 437         struct hid_sensor_hub_callbacks_list *callback;
 438         unsigned long flags;
 439
 440         hid_dbg(hdev, " sensor_hub_suspend\n");
 441         spin_lock_irqsave(&pdata->dyn_callback_lock, flags);
 442         list_for_each_entry(callback, &pdata->dyn_callback_list, list) {
 443                 if (callback->usage_callback->suspend)
 444                         callback->usage_callback->suspend(
 445                                         callback->hsdev, callback->priv);
 446         }
 447         spin_unlock_irqrestore(&pdata->dyn_callback_lock, flags);
 448
 449         return 0;
 450 }
 451
 452 static int sensor_hub_resume(struct hid_device *hdev)
 453 {
 454         struct sensor_hub_data *pdata = hid_get_drvdata(hdev);
 455         struct hid_sensor_hub_callbacks_list *callback;
 456         unsigned long flags;
 457
 458         hid_dbg(hdev, " sensor_hub_resume\n");
 459         spin_lock_irqsave(&pdata->dyn_callback_lock, flags);
 460         list_for_each_entry(callback, &pdata->dyn_callback_list, list) {
 461                 if (callback->usage_callback->resume)
 462                         callback->usage_callback->resume(
 463                                         callback->hsdev, callback->priv);
 464         }
 465         spin_unlock_irqrestore(&pdata->dyn_callback_lock, flags);
 466
 467         return 0;
 468 }
 469
 470 static int sensor_hub_reset_resume(struct hid_device *hdev)
 471 {
 472         return 0;
 473 }
 474 #endif
 475
 476 /*
 477  * Handle raw report as sent by device
 478  */
 479 static int sensor_hub_raw_event(struct hid_device *hdev,
 480                 struct hid_report *report, u8 *raw_data, int size)
 481 {
 482         int i;
 483         u8 *ptr;
 484         int sz;
 485         struct sensor_hub_data *pdata = hid_get_drvdata(hdev);
 486         unsigned long flags;
 487         struct hid_sensor_hub_callbacks *callback = NULL;
 488         struct hid_collection *collection = NULL;
 489         void *priv = NULL;
 490         struct hid_sensor_hub_device *hsdev = NULL;
 491
 492         hid_dbg(hdev, "sensor_hub_raw_event report id:0x%x size:%d type:%d\n",
 493                          report->id, size, report->type);
 494         hid_dbg(hdev, "maxfield:%d\n", report->maxfield);
 495         if (report->type != HID_INPUT_REPORT)
 496                 return 1;
 497
 498         ptr = raw_data;
 499         ptr++; /* Skip report id */
 500
 501         spin_lock_irqsave(&pdata->lock, flags);
 502
 503         for (i = 0; i < report->maxfield; ++i) {
 504                 hid_dbg(hdev, "%d collection_index:%x hid:%x sz:%x\n",
 505                                 i, report->field[i]->usage->collection_index,
 506                                 report->field[i]->usage->hid,
 507                                 (report->field[i]->report_size *
 508                                         report->field[i]->report_count)/8);
 509                 sz = (report->field[i]->report_size *
 510                                         report->field[i]->report_count)/8;
 511                 collection = &hdev->collection[
 512                                 report->field[i]->usage->collection_index];
 513                 hid_dbg(hdev, "collection->usage %x\n",
 514                                         collection->usage);
 515
 516                 callback = sensor_hub_get_callback(hdev,
 517                                 report->field[i]->physical,
 518                                 report->field[i]->usage[0].collection_index,
 519                                 &hsdev, &priv);
 520                 if (!callback) {
 521                         ptr += sz;
 522                         continue;
 523                 }
 524                 if (hsdev->pending.status && (hsdev->pending.attr_usage_id ==
 525                                               report->field[i]->usage->hid ||
 526                                               hsdev->pending.attr_usage_id ==
 527                                               report->field[i]->logical)) {
 528                         hid_dbg(hdev, "data was pending ...\n");
 529                         hsdev->pending.raw_data = kmemdup(ptr, sz, GFP_ATOMIC);
 530                         if (hsdev->pending.raw_data)
 531                                 hsdev->pending.raw_size = sz;
 532                         else
 533                                 hsdev->pending.raw_size = 0;
 534                         complete(&hsdev->pending.ready);
 535                 }
 536                 if (callback->capture_sample) {
 537                         if (report->field[i]->logical)
 538                                 callback->capture_sample(hsdev,
 539                                         report->field[i]->logical, sz, ptr,
 540                                         callback->pdev);
 541                         else
 542                                 callback->capture_sample(hsdev,
 543                                         report->field[i]->usage->hid, sz, ptr,
 544                                         callback->pdev);
 545                 }
 546                 ptr += sz;
 547         }
 548         if (callback && collection && callback->send_event)
 549                 callback->send_event(hsdev, collection->usage,
 550                                 callback->pdev);
 551         spin_unlock_irqrestore(&pdata->lock, flags);
 552
 553         return 1;
 554 }
 555
 556 int sensor_hub_device_open(struct hid_sensor_hub_device *hsdev)
 557 {
 558         int ret = 0;
 559         struct sensor_hub_data *data =  hid_get_drvdata(hsdev->hdev);
 560
 561         mutex_lock(&data->mutex);
 562         if (!data->ref_cnt) {
 563                 ret = hid_hw_open(hsdev->hdev);
 564                 if (ret) {
 565                         hid_err(hsdev->hdev, "failed to open hid device\n");
 566                         mutex_unlock(&data->mutex);
 567                         return ret;
 568                 }
 569         }
 570         data->ref_cnt++;
 571         mutex_unlock(&data->mutex);
 572
 573         return ret;
 574 }
 575 EXPORT_SYMBOL_GPL(sensor_hub_device_open);
 576
 577 void sensor_hub_device_close(struct hid_sensor_hub_device *hsdev)
 578 {
 579         struct sensor_hub_data *data =  hid_get_drvdata(hsdev->hdev);
 580
 581         mutex_lock(&data->mutex);
 582         data->ref_cnt--;
 583         if (!data->ref_cnt)
 584                 hid_hw_close(hsdev->hdev);
 585         mutex_unlock(&data->mutex);
 586 }
 587 EXPORT_SYMBOL_GPL(sensor_hub_device_close);
 588
 589 static __u8 *sensor_hub_report_fixup(struct hid_device *hdev, __u8 *rdesc,
 590                 unsigned int *rsize)
 591 {
 592         /*
 593          * Checks if the report descriptor of Thinkpad Helix 2 has a logical
 594          * minimum for magnetic flux axis greater than the maximum.
 595          */
 596         if (hdev->product == USB_DEVICE_ID_TEXAS_INSTRUMENTS_LENOVO_YOGA &&
 597                 *rsize == 2558 && rdesc[913] == 0x17 && rdesc[914] == 0x40 &&
 598                 rdesc[915] == 0x81 && rdesc[916] == 0x08 &&
 599                 rdesc[917] == 0x00 && rdesc[918] == 0x27 &&
 600                 rdesc[921] == 0x07 && rdesc[922] == 0x00) {
 601                 /* Sets negative logical minimum for mag x, y and z */
 602                 rdesc[914] = rdesc[935] = rdesc[956] = 0xc0;
 603                 rdesc[915] = rdesc[936] = rdesc[957] = 0x7e;
 604                 rdesc[916] = rdesc[937] = rdesc[958] = 0xf7;
 605                 rdesc[917] = rdesc[938] = rdesc[959] = 0xff;
 606         }
 607
 608         return rdesc;
 609 }
 610
 611 static int sensor_hub_probe(struct hid_device *hdev,
 612                                 const struct hid_device_id *id)
 613 {
 614         int ret;
 615         struct sensor_hub_data *sd;
 616         int i;
 617         char *name;
 618         int dev_cnt;
 619         struct hid_sensor_hub_device *hsdev;
 620         struct hid_sensor_hub_device *last_hsdev = NULL;
 621         struct hid_sensor_hub_device *collection_hsdev = NULL;
 622
 623         sd = devm_kzalloc(&hdev->dev, sizeof(*sd), GFP_KERNEL);
 624         if (!sd) {
 625                 hid_err(hdev, "cannot allocate Sensor data\n");
 626                 return -ENOMEM;
 627         }
 628
 629         hid_set_drvdata(hdev, sd);
 630         sd->quirks = id->driver_data;
 631
 632         spin_lock_init(&sd->lock);
 633         spin_lock_init(&sd->dyn_callback_lock);
 634         mutex_init(&sd->mutex);
 635         ret = hid_parse(hdev);
 636         if (ret) {
 637                 hid_err(hdev, "parse failed\n");
 638                 return ret;
 639         }
 640         INIT_LIST_HEAD(&hdev->inputs);
 641
 642         ret = hid_hw_start(hdev, 0);
 643         if (ret) {
 644                 hid_err(hdev, "hw start failed\n");
 645                 return ret;
 646         }
 647         INIT_LIST_HEAD(&sd->dyn_callback_list);
 648         sd->hid_sensor_client_cnt = 0;
 649
 650         dev_cnt = sensor_hub_get_physical_device_count(hdev);
 651         if (dev_cnt > HID_MAX_PHY_DEVICES) {
 652                 hid_err(hdev, "Invalid Physical device count\n");
 653                 ret = -EINVAL;
 654                 goto err_stop_hw;
 655         }
 656         sd->hid_sensor_hub_client_devs = devm_kcalloc(&hdev->dev,
 657                                                       dev_cnt,
 658                                                       sizeof(struct mfd_cell),
 659                                                       GFP_KERNEL);
 660         if (sd->hid_sensor_hub_client_devs == NULL) {
 661                 hid_err(hdev, "Failed to allocate memory for mfd cells\n");
 662                 ret = -ENOMEM;
 663                 goto err_stop_hw;
 664         }
 665
 666         for (i = 0; i < hdev->maxcollection; ++i) {
 667                 struct hid_collection *collection = &hdev->collection[i];
 668
 669                 if (collection->type == HID_COLLECTION_PHYSICAL ||
 670                     collection->type == HID_COLLECTION_APPLICATION) {
 671
 672                         hsdev = devm_kzalloc(&hdev->dev, sizeof(*hsdev),
 673                                              GFP_KERNEL);
 674                         if (!hsdev) {
 675                                 hid_err(hdev, "cannot allocate hid_sensor_hub_device\n");
 676                                 ret = -ENOMEM;
 677                                 goto err_stop_hw;
 678                         }
 679                         hsdev->hdev = hdev;
 680                         hsdev->vendor_id = hdev->vendor;
 681                         hsdev->product_id = hdev->product;
 682                         hsdev->usage = collection->usage;
 683                         hsdev->mutex_ptr = devm_kzalloc(&hdev->dev,
 684                                                         sizeof(struct mutex),
 685                                                         GFP_KERNEL);
 686                         if (!hsdev->mutex_ptr) {
 687                                 ret = -ENOMEM;
 688                                 goto err_stop_hw;
 689                         }
 690                         mutex_init(hsdev->mutex_ptr);
 691                         hsdev->start_collection_index = i;
 692                         if (last_hsdev)
 693                                 last_hsdev->end_collection_index = i;
 694                         last_hsdev = hsdev;
 695                         name = devm_kasprintf(&hdev->dev, GFP_KERNEL,
 696                                               "HID-SENSOR-%x",
 697                                               collection->usage);
 698                         if (name == NULL) {
 699                                 hid_err(hdev, "Failed MFD device name\n");
 700                                 ret = -ENOMEM;
 701                                 goto err_stop_hw;
 702                         }
 703                         sd->hid_sensor_hub_client_devs[
 704                                 sd->hid_sensor_client_cnt].name = name;
 705                         sd->hid_sensor_hub_client_devs[
 706                                 sd->hid_sensor_client_cnt].platform_data =
 707                                                         hsdev;
 708                         sd->hid_sensor_hub_client_devs[
 709                                 sd->hid_sensor_client_cnt].pdata_size =
 710                                                         sizeof(*hsdev);
 711                         hid_dbg(hdev, "Adding %s:%d\n", name,
 712                                         hsdev->start_collection_index);
 713                         sd->hid_sensor_client_cnt++;
 714                         if (collection_hsdev)
 715                                 collection_hsdev->end_collection_index = i;
 716                         if (collection->type == HID_COLLECTION_APPLICATION &&
 717                             collection->usage == HID_USAGE_SENSOR_COLLECTION)
 718                                 collection_hsdev = hsdev;
 719                 }
 720         }
 721         if (last_hsdev)
 722                 last_hsdev->end_collection_index = i;
 723         if (collection_hsdev)
 724                 collection_hsdev->end_collection_index = i;
 725
 726         ret = mfd_add_hotplug_devices(&hdev->dev,
 727                         sd->hid_sensor_hub_client_devs,
 728                         sd->hid_sensor_client_cnt);
 729         if (ret < 0)
 730                 goto err_stop_hw;
 731
 732         return ret;
 733
 734 err_stop_hw:
 735         hid_hw_stop(hdev);
 736
 737         return ret;
 738 }
 739
 740 static void sensor_hub_remove(struct hid_device *hdev)
 741 {
 742         struct sensor_hub_data *data = hid_get_drvdata(hdev);
 743         unsigned long flags;
 744         int i;
 745
 746         hid_dbg(hdev, " hardware removed\n");
 747         hid_hw_close(hdev);
 748         hid_hw_stop(hdev);
 749         spin_lock_irqsave(&data->lock, flags);
 750         for (i = 0; i < data->hid_sensor_client_cnt; ++i) {
 751                 struct hid_sensor_hub_device *hsdev =
 752                         data->hid_sensor_hub_client_devs[i].platform_data;
 753                 if (hsdev->pending.status)
 754                         complete(&hsdev->pending.ready);
 755         }
 756         spin_unlock_irqrestore(&data->lock, flags);
 757         mfd_remove_devices(&hdev->dev);
 758         hid_set_drvdata(hdev, NULL);
 759         mutex_destroy(&data->mutex);
 760 }
 761
 762 static const struct hid_device_id sensor_hub_devices[] = {
 763         { HID_DEVICE(HID_BUS_ANY, HID_GROUP_SENSOR_HUB, HID_ANY_ID,
 764                      HID_ANY_ID) },
 765         { }
 766 };
 767 MODULE_DEVICE_TABLE(hid, sensor_hub_devices);
 768
 769 static struct hid_driver sensor_hub_driver = {
 770         .name = "hid-sensor-hub",
 771         .id_table = sensor_hub_devices,
 772         .probe = sensor_hub_probe,
 773         .remove = sensor_hub_remove,
 774         .raw_event = sensor_hub_raw_event,
 775         .report_fixup = sensor_hub_report_fixup,
 776 #ifdef CONFIG_PM
 777         .suspend = sensor_hub_suspend,
 778         .resume = sensor_hub_resume,
 779         .reset_resume = sensor_hub_reset_resume,
 780 #endif
 781 };
 782 module_hid_driver(sensor_hub_driver);
 783
 784 MODULE_DESCRIPTION("HID Sensor Hub driver");
 785 MODULE_AUTHOR("Srinivas Pandruvada <[email protected]>");
 786 MODULE_LICENSE("GPL");