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