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 */ 40 struct sensor_hub_pending { 41 bool status; 42 struct completion ready; 43 u32 usage_id; 44 u32 attr_usage_id; 45 int raw_size; 46 u8 *raw_data; 47 }; 48 49 /** 50 * struct sensor_hub_data - Hold a instance data for a HID hub device 51 * @hsdev: Stored hid instance for current hub device. 52 * @mutex: Mutex to serialize synchronous request. 53 * @lock: Spin lock to protect pending request structure. 54 * @pending: Holds information of pending sync read request. 55 * @dyn_callback_list: Holds callback function 56 * @dyn_callback_lock: spin lock to protect callback list 57 * @hid_sensor_hub_client_devs: Stores all MFD cells for a hub instance. 58 * @hid_sensor_client_cnt: Number of MFD cells, (no of sensors attached). 59 */ 60 struct 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 */ 78 struct 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 85 static int sensor_hub_check_for_sensor_page(struct hid_device *hdev) 86 { 87 int i; 88 int ret = -EINVAL; 89 90 for (i = 0; i < hdev->maxcollection; i++) { 91 struct hid_collection *col = &hdev->collection[i]; 92 if (col->type == HID_COLLECTION_PHYSICAL && 93 (col->usage & HID_USAGE_PAGE) == HID_UP_SENSOR) { 94 ret = 0; 95 break; 96 } 97 } 98 99 return ret; 100 } 101 102 static struct hid_report *sensor_hub_report(int id, struct hid_device *hdev, 103 int dir) 104 { 105 struct hid_report *report; 106 107 list_for_each_entry(report, &hdev->report_enum[dir].report_list, list) { 108 if (report->id == id) 109 return report; 110 } 111 hid_warn(hdev, "No report with id 0x%x found\n", id); 112 113 return NULL; 114 } 115 116 static int sensor_hub_get_physical_device_count( 117 struct hid_report_enum *report_enum) 118 { 119 struct hid_report *report; 120 struct hid_field *field; 121 int cnt = 0; 122 123 list_for_each_entry(report, &report_enum->report_list, list) { 124 field = report->field[0]; 125 if (report->maxfield && field && 126 field->physical) 127 cnt++; 128 } 129 130 return cnt; 131 } 132 133 static void sensor_hub_fill_attr_info( 134 struct hid_sensor_hub_attribute_info *info, 135 s32 index, s32 report_id, s32 units, s32 unit_expo, s32 size) 136 { 137 info->index = index; 138 info->report_id = report_id; 139 info->units = units; 140 info->unit_expo = unit_expo; 141 info->size = size/8; 142 } 143 144 static struct hid_sensor_hub_callbacks *sensor_hub_get_callback( 145 struct hid_device *hdev, 146 u32 usage_id, void **priv) 147 { 148 struct hid_sensor_hub_callbacks_list *callback; 149 struct sensor_hub_data *pdata = hid_get_drvdata(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 *priv = callback->priv; 155 spin_unlock(&pdata->dyn_callback_lock); 156 return callback->usage_callback; 157 } 158 spin_unlock(&pdata->dyn_callback_lock); 159 160 return NULL; 161 } 162 163 int sensor_hub_register_callback(struct hid_sensor_hub_device *hsdev, 164 u32 usage_id, 165 struct hid_sensor_hub_callbacks *usage_callback) 166 { 167 struct hid_sensor_hub_callbacks_list *callback; 168 struct sensor_hub_data *pdata = hid_get_drvdata(hsdev->hdev); 169 170 spin_lock(&pdata->dyn_callback_lock); 171 list_for_each_entry(callback, &pdata->dyn_callback_list, list) 172 if (callback->usage_id == usage_id) { 173 spin_unlock(&pdata->dyn_callback_lock); 174 return -EINVAL; 175 } 176 callback = kzalloc(sizeof(*callback), GFP_ATOMIC); 177 if (!callback) { 178 spin_unlock(&pdata->dyn_callback_lock); 179 return -ENOMEM; 180 } 181 callback->usage_callback = usage_callback; 182 callback->usage_id = usage_id; 183 callback->priv = NULL; 184 list_add_tail(&callback->list, &pdata->dyn_callback_list); 185 spin_unlock(&pdata->dyn_callback_lock); 186 187 return 0; 188 } 189 EXPORT_SYMBOL_GPL(sensor_hub_register_callback); 190 191 int sensor_hub_remove_callback(struct hid_sensor_hub_device *hsdev, 192 u32 usage_id) 193 { 194 struct hid_sensor_hub_callbacks_list *callback; 195 struct sensor_hub_data *pdata = hid_get_drvdata(hsdev->hdev); 196 197 spin_lock(&pdata->dyn_callback_lock); 198 list_for_each_entry(callback, &pdata->dyn_callback_list, list) 199 if (callback->usage_id == usage_id) { 200 list_del(&callback->list); 201 kfree(callback); 202 break; 203 } 204 spin_unlock(&pdata->dyn_callback_lock); 205 206 return 0; 207 } 208 EXPORT_SYMBOL_GPL(sensor_hub_remove_callback); 209 210 int sensor_hub_set_feature(struct hid_sensor_hub_device *hsdev, u32 report_id, 211 u32 field_index, s32 value) 212 { 213 struct hid_report *report; 214 struct sensor_hub_data *data = hid_get_drvdata(hsdev->hdev); 215 int ret = 0; 216 217 mutex_lock(&data->mutex); 218 report = sensor_hub_report(report_id, hsdev->hdev, HID_FEATURE_REPORT); 219 if (!report || (field_index >= report->maxfield)) { 220 ret = -EINVAL; 221 goto done_proc; 222 } 223 hid_set_field(report->field[field_index], 0, value); 224 usbhid_submit_report(hsdev->hdev, report, USB_DIR_OUT); 225 usbhid_wait_io(hsdev->hdev); 226 227 done_proc: 228 mutex_unlock(&data->mutex); 229 230 return ret; 231 } 232 EXPORT_SYMBOL_GPL(sensor_hub_set_feature); 233 234 int sensor_hub_get_feature(struct hid_sensor_hub_device *hsdev, u32 report_id, 235 u32 field_index, s32 *value) 236 { 237 struct hid_report *report; 238 struct sensor_hub_data *data = hid_get_drvdata(hsdev->hdev); 239 int ret = 0; 240 241 mutex_lock(&data->mutex); 242 report = sensor_hub_report(report_id, hsdev->hdev, HID_FEATURE_REPORT); 243 if (!report || (field_index >= report->maxfield)) { 244 ret = -EINVAL; 245 goto done_proc; 246 } 247 usbhid_submit_report(hsdev->hdev, report, USB_DIR_IN); 248 usbhid_wait_io(hsdev->hdev); 249 *value = report->field[field_index]->value[0]; 250 251 done_proc: 252 mutex_unlock(&data->mutex); 253 254 return ret; 255 } 256 EXPORT_SYMBOL_GPL(sensor_hub_get_feature); 257 258 259 int sensor_hub_input_attr_get_raw_value(struct hid_sensor_hub_device *hsdev, 260 u32 usage_id, 261 u32 attr_usage_id, u32 report_id) 262 { 263 struct sensor_hub_data *data = hid_get_drvdata(hsdev->hdev); 264 unsigned long flags; 265 struct hid_report *report; 266 int ret_val = 0; 267 268 mutex_lock(&data->mutex); 269 memset(&data->pending, 0, sizeof(data->pending)); 270 init_completion(&data->pending.ready); 271 data->pending.usage_id = usage_id; 272 data->pending.attr_usage_id = attr_usage_id; 273 data->pending.raw_size = 0; 274 275 spin_lock_irqsave(&data->lock, flags); 276 data->pending.status = true; 277 report = sensor_hub_report(report_id, hsdev->hdev, HID_INPUT_REPORT); 278 if (!report) { 279 spin_unlock_irqrestore(&data->lock, flags); 280 goto err_free; 281 } 282 usbhid_submit_report(hsdev->hdev, report, USB_DIR_IN); 283 spin_unlock_irqrestore(&data->lock, flags); 284 wait_for_completion_interruptible_timeout(&data->pending.ready, HZ*5); 285 switch (data->pending.raw_size) { 286 case 1: 287 ret_val = *(u8 *)data->pending.raw_data; 288 break; 289 case 2: 290 ret_val = *(u16 *)data->pending.raw_data; 291 break; 292 case 4: 293 ret_val = *(u32 *)data->pending.raw_data; 294 break; 295 default: 296 ret_val = 0; 297 } 298 kfree(data->pending.raw_data); 299 300 err_free: 301 data->pending.status = false; 302 mutex_unlock(&data->mutex); 303 304 return ret_val; 305 } 306 EXPORT_SYMBOL_GPL(sensor_hub_input_attr_get_raw_value); 307 308 int sensor_hub_input_get_attribute_info(struct hid_sensor_hub_device *hsdev, 309 u8 type, 310 u32 usage_id, 311 u32 attr_usage_id, 312 struct hid_sensor_hub_attribute_info *info) 313 { 314 int ret = -1; 315 int i, j; 316 int collection_index = -1; 317 struct hid_report *report; 318 struct hid_field *field; 319 struct hid_report_enum *report_enum; 320 struct hid_device *hdev = hsdev->hdev; 321 322 /* Initialize with defaults */ 323 info->usage_id = usage_id; 324 info->attrib_id = attr_usage_id; 325 info->report_id = -1; 326 info->index = -1; 327 info->units = -1; 328 info->unit_expo = -1; 329 330 for (i = 0; i < hdev->maxcollection; ++i) { 331 struct hid_collection *collection = &hdev->collection[i]; 332 if (usage_id == collection->usage) { 333 collection_index = i; 334 break; 335 } 336 } 337 if (collection_index == -1) 338 goto err_ret; 339 340 report_enum = &hdev->report_enum[type]; 341 list_for_each_entry(report, &report_enum->report_list, list) { 342 for (i = 0; i < report->maxfield; ++i) { 343 field = report->field[i]; 344 if (field->physical == usage_id && 345 field->logical == attr_usage_id) { 346 sensor_hub_fill_attr_info(info, i, report->id, 347 field->unit, field->unit_exponent, 348 field->report_size); 349 ret = 0; 350 } else { 351 for (j = 0; j < field->maxusage; ++j) { 352 if (field->usage[j].hid == 353 attr_usage_id && 354 field->usage[j].collection_index == 355 collection_index) { 356 sensor_hub_fill_attr_info(info, 357 i, report->id, 358 field->unit, 359 field->unit_exponent, 360 field->report_size); 361 ret = 0; 362 break; 363 } 364 } 365 } 366 if (ret == 0) 367 break; 368 } 369 } 370 371 err_ret: 372 return ret; 373 } 374 EXPORT_SYMBOL_GPL(sensor_hub_input_get_attribute_info); 375 376 #ifdef CONFIG_PM 377 static int sensor_hub_suspend(struct hid_device *hdev, pm_message_t message) 378 { 379 struct sensor_hub_data *pdata = hid_get_drvdata(hdev); 380 struct hid_sensor_hub_callbacks_list *callback; 381 382 hid_dbg(hdev, " sensor_hub_suspend\n"); 383 spin_lock(&pdata->dyn_callback_lock); 384 list_for_each_entry(callback, &pdata->dyn_callback_list, list) { 385 if (callback->usage_callback->suspend) 386 callback->usage_callback->suspend( 387 pdata->hsdev, callback->priv); 388 } 389 spin_unlock(&pdata->dyn_callback_lock); 390 391 return 0; 392 } 393 394 static int sensor_hub_resume(struct hid_device *hdev) 395 { 396 struct sensor_hub_data *pdata = hid_get_drvdata(hdev); 397 struct hid_sensor_hub_callbacks_list *callback; 398 399 hid_dbg(hdev, " sensor_hub_resume\n"); 400 spin_lock(&pdata->dyn_callback_lock); 401 list_for_each_entry(callback, &pdata->dyn_callback_list, list) { 402 if (callback->usage_callback->resume) 403 callback->usage_callback->resume( 404 pdata->hsdev, callback->priv); 405 } 406 spin_unlock(&pdata->dyn_callback_lock); 407 408 return 0; 409 } 410 411 static int sensor_hub_reset_resume(struct hid_device *hdev) 412 { 413 return 0; 414 } 415 #endif 416 /* 417 * Handle raw report as sent by device 418 */ 419 static int sensor_hub_raw_event(struct hid_device *hdev, 420 struct hid_report *report, u8 *raw_data, int size) 421 { 422 int i; 423 u8 *ptr; 424 int sz; 425 struct sensor_hub_data *pdata = hid_get_drvdata(hdev); 426 unsigned long flags; 427 struct hid_sensor_hub_callbacks *callback = NULL; 428 struct hid_collection *collection = NULL; 429 void *priv = NULL; 430 431 hid_dbg(hdev, "sensor_hub_raw_event report id:0x%x size:%d type:%d\n", 432 report->id, size, report->type); 433 hid_dbg(hdev, "maxfield:%d\n", report->maxfield); 434 if (report->type != HID_INPUT_REPORT) 435 return 1; 436 437 ptr = raw_data; 438 ptr++; /*Skip report id*/ 439 440 if (!report) 441 goto err_report; 442 443 spin_lock_irqsave(&pdata->lock, flags); 444 445 for (i = 0; i < report->maxfield; ++i) { 446 447 hid_dbg(hdev, "%d collection_index:%x hid:%x sz:%x\n", 448 i, report->field[i]->usage->collection_index, 449 report->field[i]->usage->hid, 450 report->field[i]->report_size/8); 451 452 sz = report->field[i]->report_size/8; 453 if (pdata->pending.status && pdata->pending.attr_usage_id == 454 report->field[i]->usage->hid) { 455 hid_dbg(hdev, "data was pending ...\n"); 456 pdata->pending.raw_data = kmalloc(sz, GFP_ATOMIC); 457 if (pdata->pending.raw_data) { 458 memcpy(pdata->pending.raw_data, ptr, sz); 459 pdata->pending.raw_size = sz; 460 } else 461 pdata->pending.raw_size = 0; 462 complete(&pdata->pending.ready); 463 } 464 collection = &hdev->collection[ 465 report->field[i]->usage->collection_index]; 466 hid_dbg(hdev, "collection->usage %x\n", 467 collection->usage); 468 callback = sensor_hub_get_callback(pdata->hsdev->hdev, 469 report->field[i]->physical, 470 &priv); 471 if (callback && callback->capture_sample) { 472 if (report->field[i]->logical) 473 callback->capture_sample(pdata->hsdev, 474 report->field[i]->logical, sz, ptr, 475 callback->pdev); 476 else 477 callback->capture_sample(pdata->hsdev, 478 report->field[i]->usage->hid, sz, ptr, 479 callback->pdev); 480 } 481 ptr += sz; 482 } 483 if (callback && collection && callback->send_event) 484 callback->send_event(pdata->hsdev, collection->usage, 485 callback->pdev); 486 spin_unlock_irqrestore(&pdata->lock, flags); 487 488 err_report: 489 return 1; 490 } 491 492 static int sensor_hub_probe(struct hid_device *hdev, 493 const struct hid_device_id *id) 494 { 495 int ret; 496 struct sensor_hub_data *sd; 497 int i; 498 char *name; 499 struct hid_report *report; 500 struct hid_report_enum *report_enum; 501 struct hid_field *field; 502 int dev_cnt; 503 504 sd = kzalloc(sizeof(struct sensor_hub_data), GFP_KERNEL); 505 if (!sd) { 506 hid_err(hdev, "cannot allocate Sensor data\n"); 507 return -ENOMEM; 508 } 509 sd->hsdev = kzalloc(sizeof(struct hid_sensor_hub_device), GFP_KERNEL); 510 if (!sd->hsdev) { 511 hid_err(hdev, "cannot allocate hid_sensor_hub_device\n"); 512 ret = -ENOMEM; 513 goto err_free_hub; 514 } 515 hid_set_drvdata(hdev, sd); 516 sd->hsdev->hdev = hdev; 517 sd->hsdev->vendor_id = hdev->vendor; 518 sd->hsdev->product_id = hdev->product; 519 spin_lock_init(&sd->lock); 520 spin_lock_init(&sd->dyn_callback_lock); 521 mutex_init(&sd->mutex); 522 ret = hid_parse(hdev); 523 if (ret) { 524 hid_err(hdev, "parse failed\n"); 525 goto err_free; 526 } 527 if (sensor_hub_check_for_sensor_page(hdev) < 0) { 528 hid_err(hdev, "sensor page not found\n"); 529 goto err_free; 530 } 531 INIT_LIST_HEAD(&hdev->inputs); 532 533 ret = hid_hw_start(hdev, 0); 534 if (ret) { 535 hid_err(hdev, "hw start failed\n"); 536 goto err_free; 537 } 538 ret = hid_hw_open(hdev); 539 if (ret) { 540 hid_err(hdev, "failed to open input interrupt pipe\n"); 541 goto err_stop_hw; 542 } 543 544 INIT_LIST_HEAD(&sd->dyn_callback_list); 545 sd->hid_sensor_client_cnt = 0; 546 report_enum = &hdev->report_enum[HID_INPUT_REPORT]; 547 548 dev_cnt = sensor_hub_get_physical_device_count(report_enum); 549 if (dev_cnt > HID_MAX_PHY_DEVICES) { 550 hid_err(hdev, "Invalid Physical device count\n"); 551 ret = -EINVAL; 552 goto err_close; 553 } 554 sd->hid_sensor_hub_client_devs = kzalloc(dev_cnt * 555 sizeof(struct mfd_cell), 556 GFP_KERNEL); 557 if (sd->hid_sensor_hub_client_devs == NULL) { 558 hid_err(hdev, "Failed to allocate memory for mfd cells\n"); 559 ret = -ENOMEM; 560 goto err_close; 561 } 562 list_for_each_entry(report, &report_enum->report_list, list) { 563 hid_dbg(hdev, "Report id:%x\n", report->id); 564 field = report->field[0]; 565 if (report->maxfield && field && 566 field->physical) { 567 name = kasprintf(GFP_KERNEL, "HID-SENSOR-%x", 568 field->physical); 569 if (name == NULL) { 570 hid_err(hdev, "Failed MFD device name\n"); 571 ret = -ENOMEM; 572 goto err_free_names; 573 } 574 sd->hid_sensor_hub_client_devs[ 575 sd->hid_sensor_client_cnt].name = name; 576 sd->hid_sensor_hub_client_devs[ 577 sd->hid_sensor_client_cnt].platform_data = 578 sd->hsdev; 579 sd->hid_sensor_hub_client_devs[ 580 sd->hid_sensor_client_cnt].pdata_size = 581 sizeof(*sd->hsdev); 582 hid_dbg(hdev, "Adding %s:%p\n", name, sd); 583 sd->hid_sensor_client_cnt++; 584 } 585 } 586 ret = mfd_add_devices(&hdev->dev, 0, sd->hid_sensor_hub_client_devs, 587 sd->hid_sensor_client_cnt, NULL, 0, NULL); 588 if (ret < 0) 589 goto err_free_names; 590 591 return ret; 592 593 err_free_names: 594 for (i = 0; i < sd->hid_sensor_client_cnt ; ++i) 595 kfree(sd->hid_sensor_hub_client_devs[i].name); 596 kfree(sd->hid_sensor_hub_client_devs); 597 err_close: 598 hid_hw_close(hdev); 599 err_stop_hw: 600 hid_hw_stop(hdev); 601 err_free: 602 kfree(sd->hsdev); 603 err_free_hub: 604 kfree(sd); 605 606 return ret; 607 } 608 609 static void sensor_hub_remove(struct hid_device *hdev) 610 { 611 struct sensor_hub_data *data = hid_get_drvdata(hdev); 612 unsigned long flags; 613 int i; 614 615 hid_dbg(hdev, " hardware removed\n"); 616 hid_hw_close(hdev); 617 hid_hw_stop(hdev); 618 spin_lock_irqsave(&data->lock, flags); 619 if (data->pending.status) 620 complete(&data->pending.ready); 621 spin_unlock_irqrestore(&data->lock, flags); 622 mfd_remove_devices(&hdev->dev); 623 for (i = 0; i < data->hid_sensor_client_cnt ; ++i) 624 kfree(data->hid_sensor_hub_client_devs[i].name); 625 kfree(data->hid_sensor_hub_client_devs); 626 hid_set_drvdata(hdev, NULL); 627 mutex_destroy(&data->mutex); 628 kfree(data->hsdev); 629 kfree(data); 630 } 631 632 static const struct hid_device_id sensor_hub_devices[] = { 633 { HID_USB_DEVICE(USB_VENDOR_ID_INTEL_8086, 634 USB_DEVICE_ID_SENSOR_HUB_1020) }, 635 { HID_USB_DEVICE(USB_VENDOR_ID_INTEL_8087, 636 USB_DEVICE_ID_SENSOR_HUB_1020) }, 637 { HID_USB_DEVICE(USB_VENDOR_ID_INTEL_8086, 638 USB_DEVICE_ID_SENSOR_HUB_09FA) }, 639 { HID_USB_DEVICE(USB_VENDOR_ID_INTEL_8087, 640 USB_DEVICE_ID_SENSOR_HUB_09FA) }, 641 { HID_USB_DEVICE(USB_VENDOR_ID_STANTUM_STM, 642 USB_DEVICE_ID_SENSOR_HUB_7014) }, 643 { } 644 }; 645 MODULE_DEVICE_TABLE(hid, sensor_hub_devices); 646 647 static const struct hid_usage_id sensor_hub_grabbed_usages[] = { 648 { HID_ANY_ID, HID_ANY_ID, HID_ANY_ID }, 649 { HID_ANY_ID - 1, HID_ANY_ID - 1, HID_ANY_ID - 1 } 650 }; 651 652 static struct hid_driver sensor_hub_driver = { 653 .name = "hid-sensor-hub", 654 .id_table = sensor_hub_devices, 655 .probe = sensor_hub_probe, 656 .remove = sensor_hub_remove, 657 .raw_event = sensor_hub_raw_event, 658 #ifdef CONFIG_PM 659 .suspend = sensor_hub_suspend, 660 .resume = sensor_hub_resume, 661 .reset_resume = sensor_hub_reset_resume, 662 #endif 663 }; 664 665 static int __init sensor_hub_init(void) 666 { 667 return hid_register_driver(&sensor_hub_driver); 668 } 669 670 static void __exit sensor_hub_exit(void) 671 { 672 hid_unregister_driver(&sensor_hub_driver); 673 } 674 675 module_init(sensor_hub_init); 676 module_exit(sensor_hub_exit); 677 678 MODULE_DESCRIPTION("HID Sensor Hub driver"); 679 MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@intel.com>"); 680 MODULE_LICENSE("GPL"); 681