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 {
 304         struct sensor_hub_data *data = hid_get_drvdata(hsdev->hdev);
 305         unsigned long flags;
 306         struct hid_report *report;
 307         int ret_val = 0;
 308
 309         report = sensor_hub_report(report_id, hsdev->hdev,
 310                                    HID_INPUT_REPORT);
 311         if (!report)
 312                 return -EINVAL;
 313
 314         mutex_lock(hsdev->mutex_ptr);
 315         if (flag == SENSOR_HUB_SYNC) {
 316                 memset(&hsdev->pending, 0, sizeof(hsdev->pending));
 317                 init_completion(&hsdev->pending.ready);
 318                 hsdev->pending.usage_id = usage_id;
 319                 hsdev->pending.attr_usage_id = attr_usage_id;
 320                 hsdev->pending.raw_size = 0;
 321
 322                 spin_lock_irqsave(&data->lock, flags);
 323                 hsdev->pending.status = true;
 324                 spin_unlock_irqrestore(&data->lock, flags);
 325         }
 326         mutex_lock(&data->mutex);
 327         hid_hw_request(hsdev->hdev, report, HID_REQ_GET_REPORT);
 328         mutex_unlock(&data->mutex);
 329         if (flag == SENSOR_HUB_SYNC) {
 330                 wait_for_completion_interruptible_timeout(
 331                                                 &hsdev->pending.ready, HZ*5);
 332                 switch (hsdev->pending.raw_size) {
 333                 case 1:
 334                         ret_val = *(u8 *)hsdev->pending.raw_data;
 335                         break;
 336                 case 2:
 337                         ret_val = *(u16 *)hsdev->pending.raw_data;
 338                         break;
 339                 case 4:
 340                         ret_val = *(u32 *)hsdev->pending.raw_data;
 341                         break;
 342                 default:
 343                         ret_val = 0;
 344                 }
 345                 kfree(hsdev->pending.raw_data);
 346                 hsdev->pending.status = false;
 347         }
 348         mutex_unlock(hsdev->mutex_ptr);
 349
 350         return ret_val;
 351 }
 352 EXPORT_SYMBOL_GPL(sensor_hub_input_attr_get_raw_value);
 353
 354 int hid_sensor_get_usage_index(struct hid_sensor_hub_device *hsdev,
 355                                 u32 report_id, int field_index, u32 usage_id)
 356 {
 357         struct hid_report *report;
 358         struct hid_field *field;
 359         int i;
 360
 361         report = sensor_hub_report(report_id, hsdev->hdev, HID_FEATURE_REPORT);
 362         if (!report || (field_index >= report->maxfield))
 363                 goto done_proc;
 364
 365         field = report->field[field_index];
 366         for (i = 0; i < field->maxusage; ++i) {
 367                 if (field->usage[i].hid == usage_id)
 368                         return field->usage[i].usage_index;
 369         }
 370
 371 done_proc:
 372         return -EINVAL;
 373 }
 374 EXPORT_SYMBOL_GPL(hid_sensor_get_usage_index);
 375
 376 int sensor_hub_input_get_attribute_info(struct hid_sensor_hub_device *hsdev,
 377                                 u8 type,
 378                                 u32 usage_id,
 379                                 u32 attr_usage_id,
 380                                 struct hid_sensor_hub_attribute_info *info)
 381 {
 382         int ret = -1;
 383         int i;
 384         struct hid_report *report;
 385         struct hid_field *field;
 386         struct hid_report_enum *report_enum;
 387         struct hid_device *hdev = hsdev->hdev;
 388
 389         /* Initialize with defaults */
 390         info->usage_id = usage_id;
 391         info->attrib_id = attr_usage_id;
 392         info->report_id = -1;
 393         info->index = -1;
 394         info->units = -1;
 395         info->unit_expo = -1;
 396
 397         report_enum = &hdev->report_enum[type];
 398         list_for_each_entry(report, &report_enum->report_list, list) {
 399                 for (i = 0; i < report->maxfield; ++i) {
 400                         field = report->field[i];
 401                         if (field->maxusage) {
 402                                 if (field->physical == usage_id &&
 403                                         (field->logical == attr_usage_id ||
 404                                         field->usage[0].hid ==
 405                                                         attr_usage_id) &&
 406                                         (field->usage[0].collection_index >=
 407                                         hsdev->start_collection_index) &&
 408                                         (field->usage[0].collection_index <
 409                                         hsdev->end_collection_index)) {
 410
 411                                         sensor_hub_fill_attr_info(info, i,
 412                                                                 report->id,
 413                                                                 field);
 414                                         ret = 0;
 415                                         break;
 416                                 }
 417                         }
 418                 }
 419
 420         }
 421
 422         return ret;
 423 }
 424 EXPORT_SYMBOL_GPL(sensor_hub_input_get_attribute_info);
 425
 426 #ifdef CONFIG_PM
 427 static int sensor_hub_suspend(struct hid_device *hdev, pm_message_t message)
 428 {
 429         struct sensor_hub_data *pdata = hid_get_drvdata(hdev);
 430         struct hid_sensor_hub_callbacks_list *callback;
 431         unsigned long flags;
 432
 433         hid_dbg(hdev, " sensor_hub_suspend\n");
 434         spin_lock_irqsave(&pdata->dyn_callback_lock, flags);
 435         list_for_each_entry(callback, &pdata->dyn_callback_list, list) {
 436                 if (callback->usage_callback->suspend)
 437                         callback->usage_callback->suspend(
 438                                         callback->hsdev, callback->priv);
 439         }
 440         spin_unlock_irqrestore(&pdata->dyn_callback_lock, flags);
 441
 442         return 0;
 443 }
 444
 445 static int sensor_hub_resume(struct hid_device *hdev)
 446 {
 447         struct sensor_hub_data *pdata = hid_get_drvdata(hdev);
 448         struct hid_sensor_hub_callbacks_list *callback;
 449         unsigned long flags;
 450
 451         hid_dbg(hdev, " sensor_hub_resume\n");
 452         spin_lock_irqsave(&pdata->dyn_callback_lock, flags);
 453         list_for_each_entry(callback, &pdata->dyn_callback_list, list) {
 454                 if (callback->usage_callback->resume)
 455                         callback->usage_callback->resume(
 456                                         callback->hsdev, callback->priv);
 457         }
 458         spin_unlock_irqrestore(&pdata->dyn_callback_lock, flags);
 459
 460         return 0;
 461 }
 462
 463 static int sensor_hub_reset_resume(struct hid_device *hdev)
 464 {
 465         return 0;
 466 }
 467 #endif
 468
 469 /*
 470  * Handle raw report as sent by device
 471  */
 472 static int sensor_hub_raw_event(struct hid_device *hdev,
 473                 struct hid_report *report, u8 *raw_data, int size)
 474 {
 475         int i;
 476         u8 *ptr;
 477         int sz;
 478         struct sensor_hub_data *pdata = hid_get_drvdata(hdev);
 479         unsigned long flags;
 480         struct hid_sensor_hub_callbacks *callback = NULL;
 481         struct hid_collection *collection = NULL;
 482         void *priv = NULL;
 483         struct hid_sensor_hub_device *hsdev = NULL;
 484
 485         hid_dbg(hdev, "sensor_hub_raw_event report id:0x%x size:%d type:%d\n",
 486                          report->id, size, report->type);
 487         hid_dbg(hdev, "maxfield:%d\n", report->maxfield);
 488         if (report->type != HID_INPUT_REPORT)
 489                 return 1;
 490
 491         ptr = raw_data;
 492         ptr++; /* Skip report id */
 493
 494         spin_lock_irqsave(&pdata->lock, flags);
 495
 496         for (i = 0; i < report->maxfield; ++i) {
 497                 hid_dbg(hdev, "%d collection_index:%x hid:%x sz:%x\n",
 498                                 i, report->field[i]->usage->collection_index,
 499                                 report->field[i]->usage->hid,
 500                                 (report->field[i]->report_size *
 501                                         report->field[i]->report_count)/8);
 502                 sz = (report->field[i]->report_size *
 503                                         report->field[i]->report_count)/8;
 504                 collection = &hdev->collection[
 505                                 report->field[i]->usage->collection_index];
 506                 hid_dbg(hdev, "collection->usage %x\n",
 507                                         collection->usage);
 508
 509                 callback = sensor_hub_get_callback(hdev,
 510                                 report->field[i]->physical,
 511                                 report->field[i]->usage[0].collection_index,
 512                                 &hsdev, &priv);
 513                 if (!callback) {
 514                         ptr += sz;
 515                         continue;
 516                 }
 517                 if (hsdev->pending.status && (hsdev->pending.attr_usage_id ==
 518                                               report->field[i]->usage->hid ||
 519                                               hsdev->pending.attr_usage_id ==
 520                                               report->field[i]->logical)) {
 521                         hid_dbg(hdev, "data was pending ...\n");
 522                         hsdev->pending.raw_data = kmemdup(ptr, sz, GFP_ATOMIC);
 523                         if (hsdev->pending.raw_data)
 524                                 hsdev->pending.raw_size = sz;
 525                         else
 526                                 hsdev->pending.raw_size = 0;
 527                         complete(&hsdev->pending.ready);
 528                 }
 529                 if (callback->capture_sample) {
 530                         if (report->field[i]->logical)
 531                                 callback->capture_sample(hsdev,
 532                                         report->field[i]->logical, sz, ptr,
 533                                         callback->pdev);
 534                         else
 535                                 callback->capture_sample(hsdev,
 536                                         report->field[i]->usage->hid, sz, ptr,
 537                                         callback->pdev);
 538                 }
 539                 ptr += sz;
 540         }
 541         if (callback && collection && callback->send_event)
 542                 callback->send_event(hsdev, collection->usage,
 543                                 callback->pdev);
 544         spin_unlock_irqrestore(&pdata->lock, flags);
 545
 546         return 1;
 547 }
 548
 549 int sensor_hub_device_open(struct hid_sensor_hub_device *hsdev)
 550 {
 551         int ret = 0;
 552         struct sensor_hub_data *data =  hid_get_drvdata(hsdev->hdev);
 553
 554         mutex_lock(&data->mutex);
 555         if (!data->ref_cnt) {
 556                 ret = hid_hw_open(hsdev->hdev);
 557                 if (ret) {
 558                         hid_err(hsdev->hdev, "failed to open hid device\n");
 559                         mutex_unlock(&data->mutex);
 560                         return ret;
 561                 }
 562         }
 563         data->ref_cnt++;
 564         mutex_unlock(&data->mutex);
 565
 566         return ret;
 567 }
 568 EXPORT_SYMBOL_GPL(sensor_hub_device_open);
 569
 570 void sensor_hub_device_close(struct hid_sensor_hub_device *hsdev)
 571 {
 572         struct sensor_hub_data *data =  hid_get_drvdata(hsdev->hdev);
 573
 574         mutex_lock(&data->mutex);
 575         data->ref_cnt--;
 576         if (!data->ref_cnt)
 577                 hid_hw_close(hsdev->hdev);
 578         mutex_unlock(&data->mutex);
 579 }
 580 EXPORT_SYMBOL_GPL(sensor_hub_device_close);
 581
 582 static int sensor_hub_probe(struct hid_device *hdev,
 583                                 const struct hid_device_id *id)
 584 {
 585         int ret;
 586         struct sensor_hub_data *sd;
 587         int i;
 588         char *name;
 589         int dev_cnt;
 590         struct hid_sensor_hub_device *hsdev;
 591         struct hid_sensor_hub_device *last_hsdev = NULL;
 592         struct hid_sensor_hub_device *collection_hsdev = NULL;
 593
 594         sd = devm_kzalloc(&hdev->dev, sizeof(*sd), GFP_KERNEL);
 595         if (!sd) {
 596                 hid_err(hdev, "cannot allocate Sensor data\n");
 597                 return -ENOMEM;
 598         }
 599
 600         hid_set_drvdata(hdev, sd);
 601         sd->quirks = id->driver_data;
 602
 603         spin_lock_init(&sd->lock);
 604         spin_lock_init(&sd->dyn_callback_lock);
 605         mutex_init(&sd->mutex);
 606         ret = hid_parse(hdev);
 607         if (ret) {
 608                 hid_err(hdev, "parse failed\n");
 609                 return ret;
 610         }
 611         INIT_LIST_HEAD(&hdev->inputs);
 612
 613         ret = hid_hw_start(hdev, 0);
 614         if (ret) {
 615                 hid_err(hdev, "hw start failed\n");
 616                 return ret;
 617         }
 618         INIT_LIST_HEAD(&sd->dyn_callback_list);
 619         sd->hid_sensor_client_cnt = 0;
 620
 621         dev_cnt = sensor_hub_get_physical_device_count(hdev);
 622         if (dev_cnt > HID_MAX_PHY_DEVICES) {
 623                 hid_err(hdev, "Invalid Physical device count\n");
 624                 ret = -EINVAL;
 625                 goto err_stop_hw;
 626         }
 627         sd->hid_sensor_hub_client_devs = devm_kzalloc(&hdev->dev, dev_cnt *
 628                                                       sizeof(struct mfd_cell),
 629                                                       GFP_KERNEL);
 630         if (sd->hid_sensor_hub_client_devs == NULL) {
 631                 hid_err(hdev, "Failed to allocate memory for mfd cells\n");
 632                 ret = -ENOMEM;
 633                 goto err_stop_hw;
 634         }
 635
 636         for (i = 0; i < hdev->maxcollection; ++i) {
 637                 struct hid_collection *collection = &hdev->collection[i];
 638
 639                 if (collection->type == HID_COLLECTION_PHYSICAL ||
 640                     collection->type == HID_COLLECTION_APPLICATION) {
 641
 642                         hsdev = devm_kzalloc(&hdev->dev, sizeof(*hsdev),
 643                                              GFP_KERNEL);
 644                         if (!hsdev) {
 645                                 hid_err(hdev, "cannot allocate hid_sensor_hub_device\n");
 646                                 ret = -ENOMEM;
 647                                 goto err_stop_hw;
 648                         }
 649                         hsdev->hdev = hdev;
 650                         hsdev->vendor_id = hdev->vendor;
 651                         hsdev->product_id = hdev->product;
 652                         hsdev->usage = collection->usage;
 653                         hsdev->mutex_ptr = devm_kzalloc(&hdev->dev,
 654                                                         sizeof(struct mutex),
 655                                                         GFP_KERNEL);
 656                         if (!hsdev->mutex_ptr) {
 657                                 ret = -ENOMEM;
 658                                 goto err_stop_hw;
 659                         }
 660                         mutex_init(hsdev->mutex_ptr);
 661                         hsdev->start_collection_index = i;
 662                         if (last_hsdev)
 663                                 last_hsdev->end_collection_index = i;
 664                         last_hsdev = hsdev;
 665                         name = devm_kasprintf(&hdev->dev, GFP_KERNEL,
 666                                               "HID-SENSOR-%x",
 667                                               collection->usage);
 668                         if (name == NULL) {
 669                                 hid_err(hdev, "Failed MFD device name\n");
 670                                 ret = -ENOMEM;
 671                                 goto err_stop_hw;
 672                         }
 673                         sd->hid_sensor_hub_client_devs[
 674                                 sd->hid_sensor_client_cnt].name = name;
 675                         sd->hid_sensor_hub_client_devs[
 676                                 sd->hid_sensor_client_cnt].platform_data =
 677                                                         hsdev;
 678                         sd->hid_sensor_hub_client_devs[
 679                                 sd->hid_sensor_client_cnt].pdata_size =
 680                                                         sizeof(*hsdev);
 681                         hid_dbg(hdev, "Adding %s:%d\n", name,
 682                                         hsdev->start_collection_index);
 683                         sd->hid_sensor_client_cnt++;
 684                         if (collection_hsdev)
 685                                 collection_hsdev->end_collection_index = i;
 686                         if (collection->type == HID_COLLECTION_APPLICATION &&
 687                             collection->usage == HID_USAGE_SENSOR_COLLECTION)
 688                                 collection_hsdev = hsdev;
 689                 }
 690         }
 691         if (last_hsdev)
 692                 last_hsdev->end_collection_index = i;
 693         if (collection_hsdev)
 694                 collection_hsdev->end_collection_index = i;
 695
 696         ret = mfd_add_hotplug_devices(&hdev->dev,
 697                         sd->hid_sensor_hub_client_devs,
 698                         sd->hid_sensor_client_cnt);
 699         if (ret < 0)
 700                 goto err_stop_hw;
 701
 702         return ret;
 703
 704 err_stop_hw:
 705         hid_hw_stop(hdev);
 706
 707         return ret;
 708 }
 709
 710 static void sensor_hub_remove(struct hid_device *hdev)
 711 {
 712         struct sensor_hub_data *data = hid_get_drvdata(hdev);
 713         unsigned long flags;
 714         int i;
 715
 716         hid_dbg(hdev, " hardware removed\n");
 717         hid_hw_close(hdev);
 718         hid_hw_stop(hdev);
 719         spin_lock_irqsave(&data->lock, flags);
 720         for (i = 0; i < data->hid_sensor_client_cnt; ++i) {
 721                 struct hid_sensor_hub_device *hsdev =
 722                         data->hid_sensor_hub_client_devs[i].platform_data;
 723                 if (hsdev->pending.status)
 724                         complete(&hsdev->pending.ready);
 725         }
 726         spin_unlock_irqrestore(&data->lock, flags);
 727         mfd_remove_devices(&hdev->dev);
 728         hid_set_drvdata(hdev, NULL);
 729         mutex_destroy(&data->mutex);
 730 }
 731
 732 static const struct hid_device_id sensor_hub_devices[] = {
 733         { HID_DEVICE(HID_BUS_ANY, HID_GROUP_SENSOR_HUB, HID_ANY_ID,
 734                      HID_ANY_ID) },
 735         { }
 736 };
 737 MODULE_DEVICE_TABLE(hid, sensor_hub_devices);
 738
 739 static struct hid_driver sensor_hub_driver = {
 740         .name = "hid-sensor-hub",
 741         .id_table = sensor_hub_devices,
 742         .probe = sensor_hub_probe,
 743         .remove = sensor_hub_remove,
 744         .raw_event = sensor_hub_raw_event,
 745 #ifdef CONFIG_PM
 746         .suspend = sensor_hub_suspend,
 747         .resume = sensor_hub_resume,
 748         .reset_resume = sensor_hub_reset_resume,
 749 #endif
 750 };
 751 module_hid_driver(sensor_hub_driver);
 752
 753 MODULE_DESCRIPTION("HID Sensor Hub driver");
 754 MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@intel.com>");
 755 MODULE_LICENSE("GPL");