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