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 #include <linux/device.h>
  20 #include <linux/hid.h>
  21 #include <linux/module.h>
  22 #include <linux/slab.h>
  23 #include <linux/mfd/core.h>
  24 #include <linux/list.h>
  25 #include <linux/hid-sensor-ids.h>
  26 #include <linux/hid-sensor-hub.h>
  27 #include "hid-ids.h"
  28
  29 #define HID_SENSOR_HUB_ENUM_QUIRK       0x01
  30
  31 /**
  32  * struct sensor_hub_pending - Synchronous read pending information
  33  * @status:             Pending status true/false.
  34  * @ready:              Completion synchronization data.
  35  * @usage_id:           Usage id for physical device, E.g. Gyro usage id.
  36  * @attr_usage_id:      Usage Id of a field, E.g. X-AXIS for a gyro.
  37  * @raw_size:           Response size for a read request.
  38  * @raw_data:           Place holder for received response.
  39  */
  40 struct sensor_hub_pending {
  41         bool status;
  42         struct completion ready;
  43         u32 usage_id;
  44         u32 attr_usage_id;
  45         int raw_size;
  46         u8  *raw_data;
  47 };
  48
  49 /**
  50  * struct sensor_hub_data - Hold a instance data for a HID hub device
  51  * @hsdev:              Stored hid instance for current hub device.
  52  * @mutex:              Mutex to serialize synchronous request.
  53  * @lock:               Spin lock to protect pending request structure.
  54  * @pending:            Holds information of pending sync read request.
  55  * @dyn_callback_list:  Holds callback function
  56  * @dyn_callback_lock:  spin lock to protect callback list
  57  * @hid_sensor_hub_client_devs: Stores all MFD cells for a hub instance.
  58  * @hid_sensor_client_cnt: Number of MFD cells, (no of sensors attached).
  59  * @ref_cnt:            Number of MFD clients have opened this device
  60  */
  61 struct sensor_hub_data {
  62         struct mutex mutex;
  63         spinlock_t lock;
  64         struct sensor_hub_pending pending;
  65         struct list_head dyn_callback_list;
  66         spinlock_t dyn_callback_lock;
  67         struct mfd_cell *hid_sensor_hub_client_devs;
  68         int hid_sensor_client_cnt;
  69         unsigned long quirks;
  70         int ref_cnt;
  71 };
  72
  73 /**
  74  * struct hid_sensor_hub_callbacks_list - Stores callback list
  75  * @list:               list head.
  76  * @usage_id:           usage id for a physical device.
  77  * @usage_callback:     Stores registered callback functions.
  78  * @priv:               Private data for a physical device.
  79  */
  80 struct hid_sensor_hub_callbacks_list {
  81         struct list_head list;
  82         u32 usage_id;
  83         struct hid_sensor_hub_device *hsdev;
  84         struct hid_sensor_hub_callbacks *usage_callback;
  85         void *priv;
  86 };
  87
  88 static struct hid_report *sensor_hub_report(int id, struct hid_device *hdev,
  89                                                 int dir)
  90 {
  91         struct hid_report *report;
  92
  93         list_for_each_entry(report, &hdev->report_enum[dir].report_list, list) {
  94                 if (report->id == id)
  95                         return report;
  96         }
  97         hid_warn(hdev, "No report with id 0x%x found\n", id);
  98
  99         return NULL;
 100 }
 101
 102 static int sensor_hub_get_physical_device_count(struct hid_device *hdev)
 103 {
 104         int i;
 105         int count = 0;
 106
 107         for (i = 0; i < hdev->maxcollection; ++i) {
 108                 struct hid_collection *collection = &hdev->collection[i];
 109                 if (collection->type == HID_COLLECTION_PHYSICAL)
 110                         ++count;
 111         }
 112
 113         return count;
 114 }
 115
 116 static void sensor_hub_fill_attr_info(
 117                 struct hid_sensor_hub_attribute_info *info,
 118                 s32 index, s32 report_id, struct hid_field *field)
 119 {
 120         info->index = index;
 121         info->report_id = report_id;
 122         info->units = field->unit;
 123         info->unit_expo = field->unit_exponent;
 124         info->size = (field->report_size * field->report_count)/8;
 125         info->logical_minimum = field->logical_minimum;
 126         info->logical_maximum = field->logical_maximum;
 127 }
 128
 129 static struct hid_sensor_hub_callbacks *sensor_hub_get_callback(
 130                                         struct hid_device *hdev,
 131                                         u32 usage_id,
 132                                         int collection_index,
 133                                         struct hid_sensor_hub_device **hsdev,
 134                                         void **priv)
 135 {
 136         struct hid_sensor_hub_callbacks_list *callback;
 137         struct sensor_hub_data *pdata = hid_get_drvdata(hdev);
 138
 139         spin_lock(&pdata->dyn_callback_lock);
 140         list_for_each_entry(callback, &pdata->dyn_callback_list, list)
 141                 if (callback->usage_id == usage_id &&
 142                         (collection_index >=
 143                                 callback->hsdev->start_collection_index) &&
 144                         (collection_index <
 145                                 callback->hsdev->end_collection_index)) {
 146                         *priv = callback->priv;
 147                         *hsdev = callback->hsdev;
 148                         spin_unlock(&pdata->dyn_callback_lock);
 149                         return callback->usage_callback;
 150                 }
 151         spin_unlock(&pdata->dyn_callback_lock);
 152
 153         return NULL;
 154 }
 155
 156 int sensor_hub_register_callback(struct hid_sensor_hub_device *hsdev,
 157                         u32 usage_id,
 158                         struct hid_sensor_hub_callbacks *usage_callback)
 159 {
 160         struct hid_sensor_hub_callbacks_list *callback;
 161         struct sensor_hub_data *pdata = hid_get_drvdata(hsdev->hdev);
 162
 163         spin_lock(&pdata->dyn_callback_lock);
 164         list_for_each_entry(callback, &pdata->dyn_callback_list, list)
 165                 if (callback->usage_id == usage_id &&
 166                                                 callback->hsdev == hsdev) {
 167                         spin_unlock(&pdata->dyn_callback_lock);
 168                         return -EINVAL;
 169                 }
 170         callback = kzalloc(sizeof(*callback), GFP_ATOMIC);
 171         if (!callback) {
 172                 spin_unlock(&pdata->dyn_callback_lock);
 173                 return -ENOMEM;
 174         }
 175         callback->hsdev = hsdev;
 176         callback->usage_callback = usage_callback;
 177         callback->usage_id = usage_id;
 178         callback->priv = NULL;
 179         list_add_tail(&callback->list, &pdata->dyn_callback_list);
 180         spin_unlock(&pdata->dyn_callback_lock);
 181
 182         return 0;
 183 }
 184 EXPORT_SYMBOL_GPL(sensor_hub_register_callback);
 185
 186 int sensor_hub_remove_callback(struct hid_sensor_hub_device *hsdev,
 187                                 u32 usage_id)
 188 {
 189         struct hid_sensor_hub_callbacks_list *callback;
 190         struct sensor_hub_data *pdata = hid_get_drvdata(hsdev->hdev);
 191
 192         spin_lock(&pdata->dyn_callback_lock);
 193         list_for_each_entry(callback, &pdata->dyn_callback_list, list)
 194                 if (callback->usage_id == usage_id &&
 195                                                 callback->hsdev == hsdev) {
 196                         list_del(&callback->list);
 197                         kfree(callback);
 198                         break;
 199                 }
 200         spin_unlock(&pdata->dyn_callback_lock);
 201
 202         return 0;
 203 }
 204 EXPORT_SYMBOL_GPL(sensor_hub_remove_callback);
 205
 206 int sensor_hub_set_feature(struct hid_sensor_hub_device *hsdev, u32 report_id,
 207                                 u32 field_index, s32 value)
 208 {
 209         struct hid_report *report;
 210         struct sensor_hub_data *data = hid_get_drvdata(hsdev->hdev);
 211         int ret = 0;
 212
 213         mutex_lock(&data->mutex);
 214         report = sensor_hub_report(report_id, hsdev->hdev, HID_FEATURE_REPORT);
 215         if (!report || (field_index >= report->maxfield)) {
 216                 ret = -EINVAL;
 217                 goto done_proc;
 218         }
 219         hid_set_field(report->field[field_index], 0, value);
 220         hid_hw_request(hsdev->hdev, report, HID_REQ_SET_REPORT);
 221         hid_hw_wait(hsdev->hdev);
 222
 223 done_proc:
 224         mutex_unlock(&data->mutex);
 225
 226         return ret;
 227 }
 228 EXPORT_SYMBOL_GPL(sensor_hub_set_feature);
 229
 230 int sensor_hub_get_feature(struct hid_sensor_hub_device *hsdev, u32 report_id,
 231                                 u32 field_index, s32 *value)
 232 {
 233         struct hid_report *report;
 234         struct sensor_hub_data *data = hid_get_drvdata(hsdev->hdev);
 235         int ret = 0;
 236
 237         mutex_lock(&data->mutex);
 238         report = sensor_hub_report(report_id, hsdev->hdev, HID_FEATURE_REPORT);
 239         if (!report || (field_index >= report->maxfield) ||
 240             report->field[field_index]->report_count < 1) {
 241                 ret = -EINVAL;
 242                 goto done_proc;
 243         }
 244         hid_hw_request(hsdev->hdev, report, HID_REQ_GET_REPORT);
 245         hid_hw_wait(hsdev->hdev);
 246         *value = report->field[field_index]->value[0];
 247
 248 done_proc:
 249         mutex_unlock(&data->mutex);
 250
 251         return ret;
 252 }
 253 EXPORT_SYMBOL_GPL(sensor_hub_get_feature);
 254
 255
 256 int sensor_hub_input_attr_get_raw_value(struct hid_sensor_hub_device *hsdev,
 257                                         u32 usage_id,
 258                                         u32 attr_usage_id, u32 report_id)
 259 {
 260         struct sensor_hub_data *data = hid_get_drvdata(hsdev->hdev);
 261         unsigned long flags;
 262         struct hid_report *report;
 263         int ret_val = 0;
 264
 265         mutex_lock(&data->mutex);
 266         memset(&data->pending, 0, sizeof(data->pending));
 267         init_completion(&data->pending.ready);
 268         data->pending.usage_id = usage_id;
 269         data->pending.attr_usage_id = attr_usage_id;
 270         data->pending.raw_size = 0;
 271
 272         spin_lock_irqsave(&data->lock, flags);
 273         data->pending.status = true;
 274         spin_unlock_irqrestore(&data->lock, flags);
 275         report = sensor_hub_report(report_id, hsdev->hdev, HID_INPUT_REPORT);
 276         if (!report)
 277                 goto err_free;
 278
 279         hid_hw_request(hsdev->hdev, report, HID_REQ_GET_REPORT);
 280         wait_for_completion_interruptible_timeout(&data->pending.ready, HZ*5);
 281         switch (data->pending.raw_size) {
 282         case 1:
 283                 ret_val = *(u8 *)data->pending.raw_data;
 284                 break;
 285         case 2:
 286                 ret_val = *(u16 *)data->pending.raw_data;
 287                 break;
 288         case 4:
 289                 ret_val = *(u32 *)data->pending.raw_data;
 290                 break;
 291         default:
 292                 ret_val = 0;
 293         }
 294         kfree(data->pending.raw_data);
 295
 296 err_free:
 297         data->pending.status = false;
 298         mutex_unlock(&data->mutex);
 299
 300         return ret_val;
 301 }
 302 EXPORT_SYMBOL_GPL(sensor_hub_input_attr_get_raw_value);
 303
 304 int hid_sensor_get_usage_index(struct hid_sensor_hub_device *hsdev,
 305                                 u32 report_id, int field_index, u32 usage_id)
 306 {
 307         struct hid_report *report;
 308         struct hid_field *field;
 309         int i;
 310
 311         report = sensor_hub_report(report_id, hsdev->hdev, HID_FEATURE_REPORT);
 312         if (!report || (field_index >= report->maxfield))
 313                 goto done_proc;
 314
 315         field = report->field[field_index];
 316         for (i = 0; i < field->maxusage; ++i) {
 317                 if (field->usage[i].hid == usage_id)
 318                         return field->usage[i].usage_index;
 319         }
 320
 321 done_proc:
 322         return -EINVAL;
 323 }
 324 EXPORT_SYMBOL_GPL(hid_sensor_get_usage_index);
 325
 326 int sensor_hub_input_get_attribute_info(struct hid_sensor_hub_device *hsdev,
 327                                 u8 type,
 328                                 u32 usage_id,
 329                                 u32 attr_usage_id,
 330                                 struct hid_sensor_hub_attribute_info *info)
 331 {
 332         int ret = -1;
 333         int i;
 334         struct hid_report *report;
 335         struct hid_field *field;
 336         struct hid_report_enum *report_enum;
 337         struct hid_device *hdev = hsdev->hdev;
 338
 339         /* Initialize with defaults */
 340         info->usage_id = usage_id;
 341         info->attrib_id = attr_usage_id;
 342         info->report_id = -1;
 343         info->index = -1;
 344         info->units = -1;
 345         info->unit_expo = -1;
 346
 347         report_enum = &hdev->report_enum[type];
 348         list_for_each_entry(report, &report_enum->report_list, list) {
 349                 for (i = 0; i < report->maxfield; ++i) {
 350                         field = report->field[i];
 351                         if (field->maxusage) {
 352                                 if (field->physical == usage_id &&
 353                                         (field->logical == attr_usage_id ||
 354                                         field->usage[0].hid ==
 355                                                         attr_usage_id) &&
 356                                         (field->usage[0].collection_index >=
 357                                         hsdev->start_collection_index) &&
 358                                         (field->usage[0].collection_index <
 359                                         hsdev->end_collection_index)) {
 360
 361                                         sensor_hub_fill_attr_info(info, i,
 362                                                                 report->id,
 363                                                                 field);
 364                                         ret = 0;
 365                                         break;
 366                                 }
 367                         }
 368                 }
 369
 370         }
 371
 372         return ret;
 373 }
 374 EXPORT_SYMBOL_GPL(sensor_hub_input_get_attribute_info);
 375
 376 #ifdef CONFIG_PM
 377 static int sensor_hub_suspend(struct hid_device *hdev, pm_message_t message)
 378 {
 379         struct sensor_hub_data *pdata = hid_get_drvdata(hdev);
 380         struct hid_sensor_hub_callbacks_list *callback;
 381
 382         hid_dbg(hdev, " sensor_hub_suspend\n");
 383         spin_lock(&pdata->dyn_callback_lock);
 384         list_for_each_entry(callback, &pdata->dyn_callback_list, list) {
 385                 if (callback->usage_callback->suspend)
 386                         callback->usage_callback->suspend(
 387                                         callback->hsdev, callback->priv);
 388         }
 389         spin_unlock(&pdata->dyn_callback_lock);
 390
 391         return 0;
 392 }
 393
 394 static int sensor_hub_resume(struct hid_device *hdev)
 395 {
 396         struct sensor_hub_data *pdata = hid_get_drvdata(hdev);
 397         struct hid_sensor_hub_callbacks_list *callback;
 398
 399         hid_dbg(hdev, " sensor_hub_resume\n");
 400         spin_lock(&pdata->dyn_callback_lock);
 401         list_for_each_entry(callback, &pdata->dyn_callback_list, list) {
 402                 if (callback->usage_callback->resume)
 403                         callback->usage_callback->resume(
 404                                         callback->hsdev, callback->priv);
 405         }
 406         spin_unlock(&pdata->dyn_callback_lock);
 407
 408         return 0;
 409 }
 410
 411 static int sensor_hub_reset_resume(struct hid_device *hdev)
 412 {
 413         return 0;
 414 }
 415 #endif
 416
 417 /*
 418  * Handle raw report as sent by device
 419  */
 420 static int sensor_hub_raw_event(struct hid_device *hdev,
 421                 struct hid_report *report, u8 *raw_data, int size)
 422 {
 423         int i;
 424         u8 *ptr;
 425         int sz;
 426         struct sensor_hub_data *pdata = hid_get_drvdata(hdev);
 427         unsigned long flags;
 428         struct hid_sensor_hub_callbacks *callback = NULL;
 429         struct hid_collection *collection = NULL;
 430         void *priv = NULL;
 431         struct hid_sensor_hub_device *hsdev = NULL;
 432
 433         hid_dbg(hdev, "sensor_hub_raw_event report id:0x%x size:%d type:%d\n",
 434                          report->id, size, report->type);
 435         hid_dbg(hdev, "maxfield:%d\n", report->maxfield);
 436         if (report->type != HID_INPUT_REPORT)
 437                 return 1;
 438
 439         ptr = raw_data;
 440         ptr++; /* Skip report id */
 441
 442         spin_lock_irqsave(&pdata->lock, flags);
 443
 444         for (i = 0; i < report->maxfield; ++i) {
 445                 hid_dbg(hdev, "%d collection_index:%x hid:%x sz:%x\n",
 446                                 i, report->field[i]->usage->collection_index,
 447                                 report->field[i]->usage->hid,
 448                                 (report->field[i]->report_size *
 449                                         report->field[i]->report_count)/8);
 450                 sz = (report->field[i]->report_size *
 451                                         report->field[i]->report_count)/8;
 452                 if (pdata->pending.status && pdata->pending.attr_usage_id ==
 453                                 report->field[i]->usage->hid) {
 454                         hid_dbg(hdev, "data was pending ...\n");
 455                         pdata->pending.raw_data = kmemdup(ptr, sz, GFP_ATOMIC);
 456                         if (pdata->pending.raw_data)
 457                                 pdata->pending.raw_size = sz;
 458                         else
 459                                 pdata->pending.raw_size = 0;
 460                         complete(&pdata->pending.ready);
 461                 }
 462                 collection = &hdev->collection[
 463                                 report->field[i]->usage->collection_index];
 464                 hid_dbg(hdev, "collection->usage %x\n",
 465                                         collection->usage);
 466
 467                 callback = sensor_hub_get_callback(hdev,
 468                                 report->field[i]->physical,
 469                                 report->field[i]->usage[0].collection_index,
 470                                 &hsdev, &priv);
 471
 472                 if (callback && callback->capture_sample) {
 473                         if (report->field[i]->logical)
 474                                 callback->capture_sample(hsdev,
 475                                         report->field[i]->logical, sz, ptr,
 476                                         callback->pdev);
 477                         else
 478                                 callback->capture_sample(hsdev,
 479                                         report->field[i]->usage->hid, sz, ptr,
 480                                         callback->pdev);
 481                 }
 482                 ptr += sz;
 483         }
 484         if (callback && collection && callback->send_event)
 485                 callback->send_event(hsdev, collection->usage,
 486                                 callback->pdev);
 487         spin_unlock_irqrestore(&pdata->lock, flags);
 488
 489         return 1;
 490 }
 491
 492 int sensor_hub_device_open(struct hid_sensor_hub_device *hsdev)
 493 {
 494         int ret = 0;
 495         struct sensor_hub_data *data =  hid_get_drvdata(hsdev->hdev);
 496
 497         mutex_lock(&data->mutex);
 498         if (!data->ref_cnt) {
 499                 ret = hid_hw_open(hsdev->hdev);
 500                 if (ret) {
 501                         hid_err(hsdev->hdev, "failed to open hid device\n");
 502                         mutex_unlock(&data->mutex);
 503                         return ret;
 504                 }
 505         }
 506         data->ref_cnt++;
 507         mutex_unlock(&data->mutex);
 508
 509         return ret;
 510 }
 511 EXPORT_SYMBOL_GPL(sensor_hub_device_open);
 512
 513 void sensor_hub_device_close(struct hid_sensor_hub_device *hsdev)
 514 {
 515         struct sensor_hub_data *data =  hid_get_drvdata(hsdev->hdev);
 516
 517         mutex_lock(&data->mutex);
 518         data->ref_cnt--;
 519         if (!data->ref_cnt)
 520                 hid_hw_close(hsdev->hdev);
 521         mutex_unlock(&data->mutex);
 522 }
 523 EXPORT_SYMBOL_GPL(sensor_hub_device_close);
 524
 525 static __u8 *sensor_hub_report_fixup(struct hid_device *hdev, __u8 *rdesc,
 526                 unsigned int *rsize)
 527 {
 528         int index;
 529         struct sensor_hub_data *sd =  hid_get_drvdata(hdev);
 530         unsigned char report_block[] = {
 531                                 0x0a,  0x16, 0x03, 0x15, 0x00, 0x25, 0x05};
 532         unsigned char power_block[] = {
 533                                 0x0a,  0x19, 0x03, 0x15, 0x00, 0x25, 0x05};
 534
 535         if (!(sd->quirks & HID_SENSOR_HUB_ENUM_QUIRK)) {
 536                 hid_dbg(hdev, "No Enum quirks\n");
 537                 return rdesc;
 538         }
 539
 540         /* Looks for power and report state usage id and force to 1 */
 541         for (index = 0; index < *rsize; ++index) {
 542                 if (((*rsize - index) > sizeof(report_block)) &&
 543                         !memcmp(&rdesc[index], report_block,
 544                                                 sizeof(report_block))) {
 545                         rdesc[index + 4] = 0x01;
 546                         index += sizeof(report_block);
 547                 }
 548                 if (((*rsize - index) > sizeof(power_block)) &&
 549                         !memcmp(&rdesc[index], power_block,
 550                                                 sizeof(power_block))) {
 551                         rdesc[index + 4] = 0x01;
 552                         index += sizeof(power_block);
 553                 }
 554         }
 555
 556         return rdesc;
 557 }
 558
 559 static int sensor_hub_probe(struct hid_device *hdev,
 560                                 const struct hid_device_id *id)
 561 {
 562         int ret;
 563         struct sensor_hub_data *sd;
 564         int i;
 565         char *name;
 566         int dev_cnt;
 567         struct hid_sensor_hub_device *hsdev;
 568         struct hid_sensor_hub_device *last_hsdev = NULL;
 569
 570         sd = devm_kzalloc(&hdev->dev, sizeof(*sd), GFP_KERNEL);
 571         if (!sd) {
 572                 hid_err(hdev, "cannot allocate Sensor data\n");
 573                 return -ENOMEM;
 574         }
 575
 576         hid_set_drvdata(hdev, sd);
 577         sd->quirks = id->driver_data;
 578
 579         spin_lock_init(&sd->lock);
 580         spin_lock_init(&sd->dyn_callback_lock);
 581         mutex_init(&sd->mutex);
 582         ret = hid_parse(hdev);
 583         if (ret) {
 584                 hid_err(hdev, "parse failed\n");
 585                 return ret;
 586         }
 587         INIT_LIST_HEAD(&hdev->inputs);
 588
 589         ret = hid_hw_start(hdev, 0);
 590         if (ret) {
 591                 hid_err(hdev, "hw start failed\n");
 592                 return ret;
 593         }
 594         INIT_LIST_HEAD(&sd->dyn_callback_list);
 595         sd->hid_sensor_client_cnt = 0;
 596
 597         dev_cnt = sensor_hub_get_physical_device_count(hdev);
 598         if (dev_cnt > HID_MAX_PHY_DEVICES) {
 599                 hid_err(hdev, "Invalid Physical device count\n");
 600                 ret = -EINVAL;
 601                 goto err_stop_hw;
 602         }
 603         sd->hid_sensor_hub_client_devs = kzalloc(dev_cnt *
 604                                                 sizeof(struct mfd_cell),
 605                                                 GFP_KERNEL);
 606         if (sd->hid_sensor_hub_client_devs == NULL) {
 607                 hid_err(hdev, "Failed to allocate memory for mfd cells\n");
 608                         ret = -ENOMEM;
 609                         goto err_stop_hw;
 610         }
 611
 612         for (i = 0; i < hdev->maxcollection; ++i) {
 613                 struct hid_collection *collection = &hdev->collection[i];
 614
 615                 if (collection->type == HID_COLLECTION_PHYSICAL) {
 616
 617                         hsdev = kzalloc(sizeof(*hsdev), GFP_KERNEL);
 618                         if (!hsdev) {
 619                                 hid_err(hdev, "cannot allocate hid_sensor_hub_device\n");
 620                                 ret = -ENOMEM;
 621                                 goto err_no_mem;
 622                         }
 623                         hsdev->hdev = hdev;
 624                         hsdev->vendor_id = hdev->vendor;
 625                         hsdev->product_id = hdev->product;
 626                         hsdev->start_collection_index = i;
 627                         if (last_hsdev)
 628                                 last_hsdev->end_collection_index = i;
 629                         last_hsdev = hsdev;
 630                         name = kasprintf(GFP_KERNEL, "HID-SENSOR-%x",
 631                                         collection->usage);
 632                         if (name == NULL) {
 633                                 hid_err(hdev, "Failed MFD device name\n");
 634                                         ret = -ENOMEM;
 635                                         goto err_no_mem;
 636                         }
 637                         sd->hid_sensor_hub_client_devs[
 638                                 sd->hid_sensor_client_cnt].id =
 639                                                         PLATFORM_DEVID_AUTO;
 640                         sd->hid_sensor_hub_client_devs[
 641                                 sd->hid_sensor_client_cnt].name = name;
 642                         sd->hid_sensor_hub_client_devs[
 643                                 sd->hid_sensor_client_cnt].platform_data =
 644                                                         hsdev;
 645                         sd->hid_sensor_hub_client_devs[
 646                                 sd->hid_sensor_client_cnt].pdata_size =
 647                                                         sizeof(*hsdev);
 648                         hid_dbg(hdev, "Adding %s:%d\n", name,
 649                                         hsdev->start_collection_index);
 650                         sd->hid_sensor_client_cnt++;
 651                 }
 652         }
 653         if (last_hsdev)
 654                 last_hsdev->end_collection_index = i;
 655
 656         ret = mfd_add_devices(&hdev->dev, 0, sd->hid_sensor_hub_client_devs,
 657                 sd->hid_sensor_client_cnt, NULL, 0, NULL);
 658         if (ret < 0)
 659                 goto err_no_mem;
 660
 661         return ret;
 662
 663 err_no_mem:
 664         for (i = 0; i < sd->hid_sensor_client_cnt; ++i) {
 665                 kfree(sd->hid_sensor_hub_client_devs[i].name);
 666                 kfree(sd->hid_sensor_hub_client_devs[i].platform_data);
 667         }
 668         kfree(sd->hid_sensor_hub_client_devs);
 669 err_stop_hw:
 670         hid_hw_stop(hdev);
 671
 672         return ret;
 673 }
 674
 675 static void sensor_hub_remove(struct hid_device *hdev)
 676 {
 677         struct sensor_hub_data *data = hid_get_drvdata(hdev);
 678         unsigned long flags;
 679         int i;
 680
 681         hid_dbg(hdev, " hardware removed\n");
 682         hid_hw_close(hdev);
 683         hid_hw_stop(hdev);
 684         spin_lock_irqsave(&data->lock, flags);
 685         if (data->pending.status)
 686                 complete(&data->pending.ready);
 687         spin_unlock_irqrestore(&data->lock, flags);
 688         mfd_remove_devices(&hdev->dev);
 689         for (i = 0; i < data->hid_sensor_client_cnt; ++i) {
 690                 kfree(data->hid_sensor_hub_client_devs[i].name);
 691                 kfree(data->hid_sensor_hub_client_devs[i].platform_data);
 692         }
 693         kfree(data->hid_sensor_hub_client_devs);
 694         hid_set_drvdata(hdev, NULL);
 695         mutex_destroy(&data->mutex);
 696 }
 697
 698 static const struct hid_device_id sensor_hub_devices[] = {
 699         { HID_DEVICE(HID_BUS_ANY, HID_GROUP_SENSOR_HUB, USB_VENDOR_ID_INTEL_0,
 700                         USB_DEVICE_ID_INTEL_HID_SENSOR_0),
 701                         .driver_data = HID_SENSOR_HUB_ENUM_QUIRK},
 702         { HID_DEVICE(HID_BUS_ANY, HID_GROUP_SENSOR_HUB, USB_VENDOR_ID_INTEL_1,
 703                         USB_DEVICE_ID_INTEL_HID_SENSOR_0),
 704                         .driver_data = HID_SENSOR_HUB_ENUM_QUIRK},
 705         { HID_DEVICE(HID_BUS_ANY, HID_GROUP_SENSOR_HUB, USB_VENDOR_ID_INTEL_1,
 706                         USB_DEVICE_ID_INTEL_HID_SENSOR_1),
 707                         .driver_data = HID_SENSOR_HUB_ENUM_QUIRK},
 708         { HID_DEVICE(HID_BUS_ANY, HID_GROUP_SENSOR_HUB, USB_VENDOR_ID_MICROSOFT,
 709                         USB_DEVICE_ID_MS_SURFACE_PRO_2),
 710                         .driver_data = HID_SENSOR_HUB_ENUM_QUIRK},
 711         { HID_DEVICE(HID_BUS_ANY, HID_GROUP_SENSOR_HUB, USB_VENDOR_ID_MICROSOFT,
 712                         USB_DEVICE_ID_MS_TOUCH_COVER_2),
 713                         .driver_data = HID_SENSOR_HUB_ENUM_QUIRK},
 714         { HID_DEVICE(HID_BUS_ANY, HID_GROUP_SENSOR_HUB, USB_VENDOR_ID_MICROSOFT,
 715                         USB_DEVICE_ID_MS_TYPE_COVER_2),
 716                         .driver_data = HID_SENSOR_HUB_ENUM_QUIRK},
 717         { HID_DEVICE(HID_BUS_ANY, HID_GROUP_SENSOR_HUB, USB_VENDOR_ID_STM_0,
 718                         USB_DEVICE_ID_STM_HID_SENSOR_1),
 719                         .driver_data = HID_SENSOR_HUB_ENUM_QUIRK},
 720         { HID_DEVICE(HID_BUS_ANY, HID_GROUP_SENSOR_HUB, USB_VENDOR_ID_TEXAS_INSTRUMENTS,
 721                         USB_DEVICE_ID_TEXAS_INSTRUMENTS_LENOVO_YOGA),
 722                         .driver_data = HID_SENSOR_HUB_ENUM_QUIRK},
 723         { HID_DEVICE(HID_BUS_ANY, HID_GROUP_SENSOR_HUB, HID_ANY_ID,
 724                      HID_ANY_ID) },
 725         { }
 726 };
 727 MODULE_DEVICE_TABLE(hid, sensor_hub_devices);
 728
 729 static struct hid_driver sensor_hub_driver = {
 730         .name = "hid-sensor-hub",
 731         .id_table = sensor_hub_devices,
 732         .probe = sensor_hub_probe,
 733         .remove = sensor_hub_remove,
 734         .raw_event = sensor_hub_raw_event,
 735         .report_fixup = sensor_hub_report_fixup,
 736 #ifdef CONFIG_PM
 737         .suspend = sensor_hub_suspend,
 738         .resume = sensor_hub_resume,
 739         .reset_resume = sensor_hub_reset_resume,
 740 #endif
 741 };
 742 module_hid_driver(sensor_hub_driver);
 743
 744 MODULE_DESCRIPTION("HID Sensor Hub driver");
 745 MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@intel.com>");
 746 MODULE_LICENSE("GPL");