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         memset(buffer, 0, buffer_size);
 216         mutex_lock(&data->mutex);
 217         report = sensor_hub_report(report_id, hsdev->hdev, HID_FEATURE_REPORT);
 218         if (!report || (field_index >= report->maxfield)) {
 219                 ret = -EINVAL;
 220                 goto done_proc;
 221         }
 222
 223         remaining_bytes = buffer_size % sizeof(__s32);
 224         buffer_size = buffer_size / sizeof(__s32);
 225         if (buffer_size) {
 226                 for (i = 0; i < buffer_size; ++i) {
 227                         hid_set_field(report->field[field_index], i,
 228                                       (__force __s32)cpu_to_le32(*buf32));
 229                         ++buf32;
 230                 }
 231         }
 232         if (remaining_bytes) {
 233                 value = 0;
 234                 memcpy(&value, (u8 *)buf32, remaining_bytes);
 235                 hid_set_field(report->field[field_index], i,
 236                               (__force __s32)cpu_to_le32(value));
 237         }
 238         hid_hw_request(hsdev->hdev, report, HID_REQ_SET_REPORT);
 239         hid_hw_wait(hsdev->hdev);
 240
 241 done_proc:
 242         mutex_unlock(&data->mutex);
 243
 244         return ret;
 245 }
 246 EXPORT_SYMBOL_GPL(sensor_hub_set_feature);
 247
 248 int sensor_hub_get_feature(struct hid_sensor_hub_device *hsdev, u32 report_id,
 249                            u32 field_index, int buffer_size, void *buffer)
 250 {
 251         struct hid_report *report;
 252         struct sensor_hub_data *data = hid_get_drvdata(hsdev->hdev);
 253         int report_size;
 254         int ret = 0;
 255         u8 *val_ptr;
 256         int buffer_index = 0;
 257         int i;
 258
 259         mutex_lock(&data->mutex);
 260         report = sensor_hub_report(report_id, hsdev->hdev, HID_FEATURE_REPORT);
 261         if (!report || (field_index >= report->maxfield) ||
 262             report->field[field_index]->report_count < 1) {
 263                 ret = -EINVAL;
 264                 goto done_proc;
 265         }
 266         hid_hw_request(hsdev->hdev, report, HID_REQ_GET_REPORT);
 267         hid_hw_wait(hsdev->hdev);
 268
 269         /* calculate number of bytes required to read this field */
 270         report_size = DIV_ROUND_UP(report->field[field_index]->report_size,
 271                                    8) *
 272                                    report->field[field_index]->report_count;
 273         if (!report_size) {
 274                 ret = -EINVAL;
 275                 goto done_proc;
 276         }
 277         ret = min(report_size, buffer_size);
 278
 279         val_ptr = (u8 *)report->field[field_index]->value;
 280         for (i = 0; i < report->field[field_index]->report_count; ++i) {
 281                 if (buffer_index >= ret)
 282                         break;
 283
 284                 memcpy(&((u8 *)buffer)[buffer_index], val_ptr,
 285                        report->field[field_index]->report_size / 8);
 286                 val_ptr += sizeof(__s32);
 287                 buffer_index += (report->field[field_index]->report_size / 8);
 288         }
 289
 290 done_proc:
 291         mutex_unlock(&data->mutex);
 292
 293         return ret;
 294 }
 295 EXPORT_SYMBOL_GPL(sensor_hub_get_feature);
 296
 297
 298 int sensor_hub_input_attr_get_raw_value(struct hid_sensor_hub_device *hsdev,
 299                                         u32 usage_id,
 300                                         u32 attr_usage_id, u32 report_id,
 301                                         enum sensor_hub_read_flags flag)
 302 {
 303         struct sensor_hub_data *data = hid_get_drvdata(hsdev->hdev);
 304         unsigned long flags;
 305         struct hid_report *report;
 306         int ret_val = 0;
 307
 308         report = sensor_hub_report(report_id, hsdev->hdev,
 309                                    HID_INPUT_REPORT);
 310         if (!report)
 311                 return -EINVAL;
 312
 313         mutex_lock(hsdev->mutex_ptr);
 314         if (flag == SENSOR_HUB_SYNC) {
 315                 memset(&hsdev->pending, 0, sizeof(hsdev->pending));
 316                 init_completion(&hsdev->pending.ready);
 317                 hsdev->pending.usage_id = usage_id;
 318                 hsdev->pending.attr_usage_id = attr_usage_id;
 319                 hsdev->pending.raw_size = 0;
 320
 321                 spin_lock_irqsave(&data->lock, flags);
 322                 hsdev->pending.status = true;
 323                 spin_unlock_irqrestore(&data->lock, flags);
 324         }
 325         mutex_lock(&data->mutex);
 326         hid_hw_request(hsdev->hdev, report, HID_REQ_GET_REPORT);
 327         mutex_unlock(&data->mutex);
 328         if (flag == SENSOR_HUB_SYNC) {
 329                 wait_for_completion_interruptible_timeout(
 330                                                 &hsdev->pending.ready, HZ*5);
 331                 switch (hsdev->pending.raw_size) {
 332                 case 1:
 333                         ret_val = *(u8 *)hsdev->pending.raw_data;
 334                         break;
 335                 case 2:
 336                         ret_val = *(u16 *)hsdev->pending.raw_data;
 337                         break;
 338                 case 4:
 339                         ret_val = *(u32 *)hsdev->pending.raw_data;
 340                         break;
 341                 default:
 342                         ret_val = 0;
 343                 }
 344                 kfree(hsdev->pending.raw_data);
 345                 hsdev->pending.status = false;
 346         }
 347         mutex_unlock(hsdev->mutex_ptr);
 348
 349         return ret_val;
 350 }
 351 EXPORT_SYMBOL_GPL(sensor_hub_input_attr_get_raw_value);
 352
 353 int hid_sensor_get_usage_index(struct hid_sensor_hub_device *hsdev,
 354                                 u32 report_id, int field_index, u32 usage_id)
 355 {
 356         struct hid_report *report;
 357         struct hid_field *field;
 358         int i;
 359
 360         report = sensor_hub_report(report_id, hsdev->hdev, HID_FEATURE_REPORT);
 361         if (!report || (field_index >= report->maxfield))
 362                 goto done_proc;
 363
 364         field = report->field[field_index];
 365         for (i = 0; i < field->maxusage; ++i) {
 366                 if (field->usage[i].hid == usage_id)
 367                         return field->usage[i].usage_index;
 368         }
 369
 370 done_proc:
 371         return -EINVAL;
 372 }
 373 EXPORT_SYMBOL_GPL(hid_sensor_get_usage_index);
 374
 375 int sensor_hub_input_get_attribute_info(struct hid_sensor_hub_device *hsdev,
 376                                 u8 type,
 377                                 u32 usage_id,
 378                                 u32 attr_usage_id,
 379                                 struct hid_sensor_hub_attribute_info *info)
 380 {
 381         int ret = -1;
 382         int i;
 383         struct hid_report *report;
 384         struct hid_field *field;
 385         struct hid_report_enum *report_enum;
 386         struct hid_device *hdev = hsdev->hdev;
 387
 388         /* Initialize with defaults */
 389         info->usage_id = usage_id;
 390         info->attrib_id = attr_usage_id;
 391         info->report_id = -1;
 392         info->index = -1;
 393         info->units = -1;
 394         info->unit_expo = -1;
 395
 396         report_enum = &hdev->report_enum[type];
 397         list_for_each_entry(report, &report_enum->report_list, list) {
 398                 for (i = 0; i < report->maxfield; ++i) {
 399                         field = report->field[i];
 400                         if (field->maxusage) {
 401                                 if (field->physical == usage_id &&
 402                                         (field->logical == attr_usage_id ||
 403                                         field->usage[0].hid ==
 404                                                         attr_usage_id) &&
 405                                         (field->usage[0].collection_index >=
 406                                         hsdev->start_collection_index) &&
 407                                         (field->usage[0].collection_index <
 408                                         hsdev->end_collection_index)) {
 409
 410                                         sensor_hub_fill_attr_info(info, i,
 411                                                                 report->id,
 412                                                                 field);
 413                                         ret = 0;
 414                                         break;
 415                                 }
 416                         }
 417                 }
 418
 419         }
 420
 421         return ret;
 422 }
 423 EXPORT_SYMBOL_GPL(sensor_hub_input_get_attribute_info);
 424
 425 #ifdef CONFIG_PM
 426 static int sensor_hub_suspend(struct hid_device *hdev, pm_message_t message)
 427 {
 428         struct sensor_hub_data *pdata = hid_get_drvdata(hdev);
 429         struct hid_sensor_hub_callbacks_list *callback;
 430         unsigned long flags;
 431
 432         hid_dbg(hdev, " sensor_hub_suspend\n");
 433         spin_lock_irqsave(&pdata->dyn_callback_lock, flags);
 434         list_for_each_entry(callback, &pdata->dyn_callback_list, list) {
 435                 if (callback->usage_callback->suspend)
 436                         callback->usage_callback->suspend(
 437                                         callback->hsdev, callback->priv);
 438         }
 439         spin_unlock_irqrestore(&pdata->dyn_callback_lock, flags);
 440
 441         return 0;
 442 }
 443
 444 static int sensor_hub_resume(struct hid_device *hdev)
 445 {
 446         struct sensor_hub_data *pdata = hid_get_drvdata(hdev);
 447         struct hid_sensor_hub_callbacks_list *callback;
 448         unsigned long flags;
 449
 450         hid_dbg(hdev, " sensor_hub_resume\n");
 451         spin_lock_irqsave(&pdata->dyn_callback_lock, flags);
 452         list_for_each_entry(callback, &pdata->dyn_callback_list, list) {
 453                 if (callback->usage_callback->resume)
 454                         callback->usage_callback->resume(
 455                                         callback->hsdev, callback->priv);
 456         }
 457         spin_unlock_irqrestore(&pdata->dyn_callback_lock, flags);
 458
 459         return 0;
 460 }
 461
 462 static int sensor_hub_reset_resume(struct hid_device *hdev)
 463 {
 464         return 0;
 465 }
 466 #endif
 467
 468 /*
 469  * Handle raw report as sent by device
 470  */
 471 static int sensor_hub_raw_event(struct hid_device *hdev,
 472                 struct hid_report *report, u8 *raw_data, int size)
 473 {
 474         int i;
 475         u8 *ptr;
 476         int sz;
 477         struct sensor_hub_data *pdata = hid_get_drvdata(hdev);
 478         unsigned long flags;
 479         struct hid_sensor_hub_callbacks *callback = NULL;
 480         struct hid_collection *collection = NULL;
 481         void *priv = NULL;
 482         struct hid_sensor_hub_device *hsdev = NULL;
 483
 484         hid_dbg(hdev, "sensor_hub_raw_event report id:0x%x size:%d type:%d\n",
 485                          report->id, size, report->type);
 486         hid_dbg(hdev, "maxfield:%d\n", report->maxfield);
 487         if (report->type != HID_INPUT_REPORT)
 488                 return 1;
 489
 490         ptr = raw_data;
 491         ptr++; /* Skip report id */
 492
 493         spin_lock_irqsave(&pdata->lock, flags);
 494
 495         for (i = 0; i < report->maxfield; ++i) {
 496                 hid_dbg(hdev, "%d collection_index:%x hid:%x sz:%x\n",
 497                                 i, report->field[i]->usage->collection_index,
 498                                 report->field[i]->usage->hid,
 499                                 (report->field[i]->report_size *
 500                                         report->field[i]->report_count)/8);
 501                 sz = (report->field[i]->report_size *
 502                                         report->field[i]->report_count)/8;
 503                 collection = &hdev->collection[
 504                                 report->field[i]->usage->collection_index];
 505                 hid_dbg(hdev, "collection->usage %x\n",
 506                                         collection->usage);
 507
 508                 callback = sensor_hub_get_callback(hdev,
 509                                 report->field[i]->physical,
 510                                 report->field[i]->usage[0].collection_index,
 511                                 &hsdev, &priv);
 512                 if (!callback) {
 513                         ptr += sz;
 514                         continue;
 515                 }
 516                 if (hsdev->pending.status && (hsdev->pending.attr_usage_id ==
 517                                               report->field[i]->usage->hid ||
 518                                               hsdev->pending.attr_usage_id ==
 519                                               report->field[i]->logical)) {
 520                         hid_dbg(hdev, "data was pending ...\n");
 521                         hsdev->pending.raw_data = kmemdup(ptr, sz, GFP_ATOMIC);
 522                         if (hsdev->pending.raw_data)
 523                                 hsdev->pending.raw_size = sz;
 524                         else
 525                                 hsdev->pending.raw_size = 0;
 526                         complete(&hsdev->pending.ready);
 527                 }
 528                 if (callback->capture_sample) {
 529                         if (report->field[i]->logical)
 530                                 callback->capture_sample(hsdev,
 531                                         report->field[i]->logical, sz, ptr,
 532                                         callback->pdev);
 533                         else
 534                                 callback->capture_sample(hsdev,
 535                                         report->field[i]->usage->hid, sz, ptr,
 536                                         callback->pdev);
 537                 }
 538                 ptr += sz;
 539         }
 540         if (callback && collection && callback->send_event)
 541                 callback->send_event(hsdev, collection->usage,
 542                                 callback->pdev);
 543         spin_unlock_irqrestore(&pdata->lock, flags);
 544
 545         return 1;
 546 }
 547
 548 int sensor_hub_device_open(struct hid_sensor_hub_device *hsdev)
 549 {
 550         int ret = 0;
 551         struct sensor_hub_data *data =  hid_get_drvdata(hsdev->hdev);
 552
 553         mutex_lock(&data->mutex);
 554         if (!data->ref_cnt) {
 555                 ret = hid_hw_open(hsdev->hdev);
 556                 if (ret) {
 557                         hid_err(hsdev->hdev, "failed to open hid device\n");
 558                         mutex_unlock(&data->mutex);
 559                         return ret;
 560                 }
 561         }
 562         data->ref_cnt++;
 563         mutex_unlock(&data->mutex);
 564
 565         return ret;
 566 }
 567 EXPORT_SYMBOL_GPL(sensor_hub_device_open);
 568
 569 void sensor_hub_device_close(struct hid_sensor_hub_device *hsdev)
 570 {
 571         struct sensor_hub_data *data =  hid_get_drvdata(hsdev->hdev);
 572
 573         mutex_lock(&data->mutex);
 574         data->ref_cnt--;
 575         if (!data->ref_cnt)
 576                 hid_hw_close(hsdev->hdev);
 577         mutex_unlock(&data->mutex);
 578 }
 579 EXPORT_SYMBOL_GPL(sensor_hub_device_close);
 580
 581 static __u8 *sensor_hub_report_fixup(struct hid_device *hdev, __u8 *rdesc,
 582                 unsigned int *rsize)
 583 {
 584         int index;
 585         struct sensor_hub_data *sd =  hid_get_drvdata(hdev);
 586         unsigned char report_block[] = {
 587                                 0x0a,  0x16, 0x03, 0x15, 0x00, 0x25, 0x05};
 588         unsigned char power_block[] = {
 589                                 0x0a,  0x19, 0x03, 0x15, 0x00, 0x25, 0x05};
 590
 591         if (!(sd->quirks & HID_SENSOR_HUB_ENUM_QUIRK)) {
 592                 hid_dbg(hdev, "No Enum quirks\n");
 593                 return rdesc;
 594         }
 595
 596         /* Looks for power and report state usage id and force to 1 */
 597         for (index = 0; index < *rsize; ++index) {
 598                 if (((*rsize - index) > sizeof(report_block)) &&
 599                         !memcmp(&rdesc[index], report_block,
 600                                                 sizeof(report_block))) {
 601                         rdesc[index + 4] = 0x01;
 602                         index += sizeof(report_block);
 603                 }
 604                 if (((*rsize - index) > sizeof(power_block)) &&
 605                         !memcmp(&rdesc[index], power_block,
 606                                                 sizeof(power_block))) {
 607                         rdesc[index + 4] = 0x01;
 608                         index += sizeof(power_block);
 609                 }
 610         }
 611
 612         /* Checks if the report descriptor of Thinkpad Helix 2 has a logical
 613          * minimum for magnetic flux axis greater than the maximum */
 614         if (hdev->product == USB_DEVICE_ID_TEXAS_INSTRUMENTS_LENOVO_YOGA &&
 615                 *rsize == 2558 && rdesc[913] == 0x17 && rdesc[914] == 0x40 &&
 616                 rdesc[915] == 0x81 && rdesc[916] == 0x08 &&
 617                 rdesc[917] == 0x00 && rdesc[918] == 0x27 &&
 618                 rdesc[921] == 0x07 && rdesc[922] == 0x00) {
 619                 /* Sets negative logical minimum for mag x, y and z */
 620                 rdesc[914] = rdesc[935] = rdesc[956] = 0xc0;
 621                 rdesc[915] = rdesc[936] = rdesc[957] = 0x7e;
 622                 rdesc[916] = rdesc[937] = rdesc[958] = 0xf7;
 623                 rdesc[917] = rdesc[938] = rdesc[959] = 0xff;
 624         }
 625
 626         return rdesc;
 627 }
 628
 629 static int sensor_hub_probe(struct hid_device *hdev,
 630                                 const struct hid_device_id *id)
 631 {
 632         int ret;
 633         struct sensor_hub_data *sd;
 634         int i;
 635         char *name;
 636         int dev_cnt;
 637         struct hid_sensor_hub_device *hsdev;
 638         struct hid_sensor_hub_device *last_hsdev = NULL;
 639         struct hid_sensor_hub_device *collection_hsdev = NULL;
 640
 641         sd = devm_kzalloc(&hdev->dev, sizeof(*sd), GFP_KERNEL);
 642         if (!sd) {
 643                 hid_err(hdev, "cannot allocate Sensor data\n");
 644                 return -ENOMEM;
 645         }
 646
 647         hid_set_drvdata(hdev, sd);
 648         sd->quirks = id->driver_data;
 649
 650         spin_lock_init(&sd->lock);
 651         spin_lock_init(&sd->dyn_callback_lock);
 652         mutex_init(&sd->mutex);
 653         ret = hid_parse(hdev);
 654         if (ret) {
 655                 hid_err(hdev, "parse failed\n");
 656                 return ret;
 657         }
 658         INIT_LIST_HEAD(&hdev->inputs);
 659
 660         ret = hid_hw_start(hdev, 0);
 661         if (ret) {
 662                 hid_err(hdev, "hw start failed\n");
 663                 return ret;
 664         }
 665         INIT_LIST_HEAD(&sd->dyn_callback_list);
 666         sd->hid_sensor_client_cnt = 0;
 667
 668         dev_cnt = sensor_hub_get_physical_device_count(hdev);
 669         if (dev_cnt > HID_MAX_PHY_DEVICES) {
 670                 hid_err(hdev, "Invalid Physical device count\n");
 671                 ret = -EINVAL;
 672                 goto err_stop_hw;
 673         }
 674         sd->hid_sensor_hub_client_devs = devm_kzalloc(&hdev->dev, dev_cnt *
 675                                                       sizeof(struct mfd_cell),
 676                                                       GFP_KERNEL);
 677         if (sd->hid_sensor_hub_client_devs == NULL) {
 678                 hid_err(hdev, "Failed to allocate memory for mfd cells\n");
 679                 ret = -ENOMEM;
 680                 goto err_stop_hw;
 681         }
 682
 683         for (i = 0; i < hdev->maxcollection; ++i) {
 684                 struct hid_collection *collection = &hdev->collection[i];
 685
 686                 if (collection->type == HID_COLLECTION_PHYSICAL ||
 687                     collection->type == HID_COLLECTION_APPLICATION) {
 688
 689                         hsdev = devm_kzalloc(&hdev->dev, sizeof(*hsdev),
 690                                              GFP_KERNEL);
 691                         if (!hsdev) {
 692                                 hid_err(hdev, "cannot allocate hid_sensor_hub_device\n");
 693                                 ret = -ENOMEM;
 694                                 goto err_stop_hw;
 695                         }
 696                         hsdev->hdev = hdev;
 697                         hsdev->vendor_id = hdev->vendor;
 698                         hsdev->product_id = hdev->product;
 699                         hsdev->usage = collection->usage;
 700                         hsdev->mutex_ptr = devm_kzalloc(&hdev->dev,
 701                                                         sizeof(struct mutex),
 702                                                         GFP_KERNEL);
 703                         if (!hsdev->mutex_ptr) {
 704                                 ret = -ENOMEM;
 705                                 goto err_stop_hw;
 706                         }
 707                         mutex_init(hsdev->mutex_ptr);
 708                         hsdev->start_collection_index = i;
 709                         if (last_hsdev)
 710                                 last_hsdev->end_collection_index = i;
 711                         last_hsdev = hsdev;
 712                         name = devm_kasprintf(&hdev->dev, GFP_KERNEL,
 713                                               "HID-SENSOR-%x",
 714                                               collection->usage);
 715                         if (name == NULL) {
 716                                 hid_err(hdev, "Failed MFD device name\n");
 717                                 ret = -ENOMEM;
 718                                 goto err_stop_hw;
 719                         }
 720                         sd->hid_sensor_hub_client_devs[
 721                                 sd->hid_sensor_client_cnt].name = name;
 722                         sd->hid_sensor_hub_client_devs[
 723                                 sd->hid_sensor_client_cnt].platform_data =
 724                                                         hsdev;
 725                         sd->hid_sensor_hub_client_devs[
 726                                 sd->hid_sensor_client_cnt].pdata_size =
 727                                                         sizeof(*hsdev);
 728                         hid_dbg(hdev, "Adding %s:%d\n", name,
 729                                         hsdev->start_collection_index);
 730                         sd->hid_sensor_client_cnt++;
 731                         if (collection_hsdev)
 732                                 collection_hsdev->end_collection_index = i;
 733                         if (collection->type == HID_COLLECTION_APPLICATION &&
 734                             collection->usage == HID_USAGE_SENSOR_COLLECTION)
 735                                 collection_hsdev = hsdev;
 736                 }
 737         }
 738         if (last_hsdev)
 739                 last_hsdev->end_collection_index = i;
 740         if (collection_hsdev)
 741                 collection_hsdev->end_collection_index = i;
 742
 743         ret = mfd_add_hotplug_devices(&hdev->dev,
 744                         sd->hid_sensor_hub_client_devs,
 745                         sd->hid_sensor_client_cnt);
 746         if (ret < 0)
 747                 goto err_stop_hw;
 748
 749         return ret;
 750
 751 err_stop_hw:
 752         hid_hw_stop(hdev);
 753
 754         return ret;
 755 }
 756
 757 static void sensor_hub_remove(struct hid_device *hdev)
 758 {
 759         struct sensor_hub_data *data = hid_get_drvdata(hdev);
 760         unsigned long flags;
 761         int i;
 762
 763         hid_dbg(hdev, " hardware removed\n");
 764         hid_hw_close(hdev);
 765         hid_hw_stop(hdev);
 766         spin_lock_irqsave(&data->lock, flags);
 767         for (i = 0; i < data->hid_sensor_client_cnt; ++i) {
 768                 struct hid_sensor_hub_device *hsdev =
 769                         data->hid_sensor_hub_client_devs[i].platform_data;
 770                 if (hsdev->pending.status)
 771                         complete(&hsdev->pending.ready);
 772         }
 773         spin_unlock_irqrestore(&data->lock, flags);
 774         mfd_remove_devices(&hdev->dev);
 775         hid_set_drvdata(hdev, NULL);
 776         mutex_destroy(&data->mutex);
 777 }
 778
 779 static const struct hid_device_id sensor_hub_devices[] = {
 780         { HID_DEVICE(HID_BUS_ANY, HID_GROUP_SENSOR_HUB, USB_VENDOR_ID_INTEL_0,
 781                         USB_DEVICE_ID_INTEL_HID_SENSOR_0),
 782                         .driver_data = HID_SENSOR_HUB_ENUM_QUIRK},
 783         { HID_DEVICE(HID_BUS_ANY, HID_GROUP_SENSOR_HUB, USB_VENDOR_ID_INTEL_1,
 784                         USB_DEVICE_ID_INTEL_HID_SENSOR_0),
 785                         .driver_data = HID_SENSOR_HUB_ENUM_QUIRK},
 786         { HID_DEVICE(HID_BUS_ANY, HID_GROUP_SENSOR_HUB, USB_VENDOR_ID_INTEL_1,
 787                         USB_DEVICE_ID_INTEL_HID_SENSOR_1),
 788                         .driver_data = HID_SENSOR_HUB_ENUM_QUIRK},
 789         { HID_DEVICE(HID_BUS_ANY, HID_GROUP_SENSOR_HUB, USB_VENDOR_ID_MICROSOFT,
 790                         USB_DEVICE_ID_MS_SURFACE_PRO_2),
 791                         .driver_data = HID_SENSOR_HUB_ENUM_QUIRK},
 792         { HID_DEVICE(HID_BUS_ANY, HID_GROUP_SENSOR_HUB, USB_VENDOR_ID_MICROSOFT,
 793                         USB_DEVICE_ID_MS_TOUCH_COVER_2),
 794                         .driver_data = HID_SENSOR_HUB_ENUM_QUIRK},
 795         { HID_DEVICE(HID_BUS_ANY, HID_GROUP_SENSOR_HUB, USB_VENDOR_ID_MICROSOFT,
 796                         USB_DEVICE_ID_MS_TYPE_COVER_2),
 797                         .driver_data = HID_SENSOR_HUB_ENUM_QUIRK},
 798         { HID_DEVICE(HID_BUS_ANY, HID_GROUP_SENSOR_HUB, USB_VENDOR_ID_STM_0,
 799                         USB_DEVICE_ID_STM_HID_SENSOR),
 800                         .driver_data = HID_SENSOR_HUB_ENUM_QUIRK},
 801         { HID_DEVICE(HID_BUS_ANY, HID_GROUP_SENSOR_HUB, USB_VENDOR_ID_STM_0,
 802                         USB_DEVICE_ID_STM_HID_SENSOR_1),
 803                         .driver_data = HID_SENSOR_HUB_ENUM_QUIRK},
 804         { HID_DEVICE(HID_BUS_ANY, HID_GROUP_SENSOR_HUB, USB_VENDOR_ID_TEXAS_INSTRUMENTS,
 805                         USB_DEVICE_ID_TEXAS_INSTRUMENTS_LENOVO_YOGA),
 806                         .driver_data = HID_SENSOR_HUB_ENUM_QUIRK},
 807         { HID_DEVICE(HID_BUS_ANY, HID_GROUP_SENSOR_HUB, USB_VENDOR_ID_ITE,
 808                         USB_DEVICE_ID_ITE_LENOVO_YOGA),
 809                         .driver_data = HID_SENSOR_HUB_ENUM_QUIRK},
 810         { HID_DEVICE(HID_BUS_ANY, HID_GROUP_SENSOR_HUB, USB_VENDOR_ID_ITE,
 811                         USB_DEVICE_ID_ITE_LENOVO_YOGA2),
 812                         .driver_data = HID_SENSOR_HUB_ENUM_QUIRK},
 813         { HID_DEVICE(HID_BUS_ANY, HID_GROUP_SENSOR_HUB, USB_VENDOR_ID_ITE,
 814                         USB_DEVICE_ID_ITE_LENOVO_YOGA900),
 815                         .driver_data = HID_SENSOR_HUB_ENUM_QUIRK},
 816         { HID_DEVICE(HID_BUS_ANY, HID_GROUP_SENSOR_HUB, USB_VENDOR_ID_INTEL_0,
 817                         0x22D8),
 818                         .driver_data = HID_SENSOR_HUB_ENUM_QUIRK},
 819         { HID_DEVICE(HID_BUS_ANY, HID_GROUP_SENSOR_HUB, HID_ANY_ID,
 820                      HID_ANY_ID) },
 821         { }
 822 };
 823 MODULE_DEVICE_TABLE(hid, sensor_hub_devices);
 824
 825 static struct hid_driver sensor_hub_driver = {
 826         .name = "hid-sensor-hub",
 827         .id_table = sensor_hub_devices,
 828         .probe = sensor_hub_probe,
 829         .remove = sensor_hub_remove,
 830         .raw_event = sensor_hub_raw_event,
 831         .report_fixup = sensor_hub_report_fixup,
 832 #ifdef CONFIG_PM
 833         .suspend = sensor_hub_suspend,
 834         .resume = sensor_hub_resume,
 835         .reset_resume = sensor_hub_reset_resume,
 836 #endif
 837 };
 838 module_hid_driver(sensor_hub_driver);
 839
 840 MODULE_DESCRIPTION("HID Sensor Hub driver");
 841 MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@intel.com>");
 842 MODULE_LICENSE("GPL");