drivers/hid/hid-rmi.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *  Copyright (c) 2013 Andrew Duggan <aduggan@synaptics.com>
   4  *  Copyright (c) 2013 Synaptics Incorporated
   5  *  Copyright (c) 2014 Benjamin Tissoires <benjamin.tissoires@gmail.com>
   6  *  Copyright (c) 2014 Red Hat, Inc
   7  */
   8
   9 #include <linux/kernel.h>
  10 #include <linux/hid.h>
  11 #include <linux/input.h>
  12 #include <linux/input/mt.h>
  13 #include <linux/irq.h>
  14 #include <linux/irqdomain.h>
  15 #include <linux/module.h>
  16 #include <linux/pm.h>
  17 #include <linux/slab.h>
  18 #include <linux/wait.h>
  19 #include <linux/sched.h>
  20 #include <linux/rmi.h>
  21 #include "hid-ids.h"
  22
  23 #define RMI_MOUSE_REPORT_ID             0x01 /* Mouse emulation Report */
  24 #define RMI_WRITE_REPORT_ID             0x09 /* Output Report */
  25 #define RMI_READ_ADDR_REPORT_ID         0x0a /* Output Report */
  26 #define RMI_READ_DATA_REPORT_ID         0x0b /* Input Report */
  27 #define RMI_ATTN_REPORT_ID              0x0c /* Input Report */
  28 #define RMI_SET_RMI_MODE_REPORT_ID      0x0f /* Feature Report */
  29
  30 /* flags */
  31 #define RMI_READ_REQUEST_PENDING        0
  32 #define RMI_READ_DATA_PENDING           1
  33 #define RMI_STARTED                     2
  34
  35 /* device flags */
  36 #define RMI_DEVICE                      BIT(0)
  37 #define RMI_DEVICE_HAS_PHYS_BUTTONS     BIT(1)
  38 #define RMI_DEVICE_OUTPUT_SET_REPORT    BIT(2)
  39
  40 /*
  41  * retrieve the ctrl registers
  42  * the ctrl register has a size of 20 but a fw bug split it into 16 + 4,
  43  * and there is no way to know if the first 20 bytes are here or not.
  44  * We use only the first 12 bytes, so get only them.
  45  */
  46 #define RMI_F11_CTRL_REG_COUNT          12
  47
  48 enum rmi_mode_type {
  49         RMI_MODE_OFF                    = 0,
  50         RMI_MODE_ATTN_REPORTS           = 1,
  51         RMI_MODE_NO_PACKED_ATTN_REPORTS = 2,
  52 };
  53
  54 /**
  55  * struct rmi_data - stores information for hid communication
  56  *
  57  * @page_mutex: Locks current page to avoid changing pages in unexpected ways.
  58  * @page: Keeps track of the current virtual page
  59  * @xport: transport device to be registered with the RMI4 core.
  60  *
  61  * @wait: Used for waiting for read data
  62  *
  63  * @writeReport: output buffer when writing RMI registers
  64  * @readReport: input buffer when reading RMI registers
  65  *
  66  * @input_report_size: size of an input report (advertised by HID)
  67  * @output_report_size: size of an output report (advertised by HID)
  68  *
  69  * @flags: flags for the current device (started, reading, etc...)
  70  *
  71  * @reset_work: worker which will be called in case of a mouse report
  72  * @hdev: pointer to the struct hid_device
  73  *
  74  * @device_flags: flags which describe the device
  75  *
  76  * @domain: the IRQ domain allocated for this RMI4 device
  77  * @rmi_irq: the irq that will be used to generate events to rmi-core
  78  */
  79 struct rmi_data {
  80         struct mutex page_mutex;
  81         int page;
  82         struct rmi_transport_dev xport;
  83
  84         wait_queue_head_t wait;
  85
  86         u8 *writeReport;
  87         u8 *readReport;
  88
  89         u32 input_report_size;
  90         u32 output_report_size;
  91
  92         unsigned long flags;
  93
  94         struct work_struct reset_work;
  95         struct hid_device *hdev;
  96
  97         unsigned long device_flags;
  98
  99         struct irq_domain *domain;
 100         int rmi_irq;
 101 };
 102
 103 #define RMI_PAGE(addr) (((addr) >> 8) & 0xff)
 104
 105 static int rmi_write_report(struct hid_device *hdev, u8 *report, int len);
 106
 107 /**
 108  * rmi_set_page - Set RMI page
 109  * @hdev: The pointer to the hid_device struct
 110  * @page: The new page address.
 111  *
 112  * RMI devices have 16-bit addressing, but some of the physical
 113  * implementations (like SMBus) only have 8-bit addressing. So RMI implements
 114  * a page address at 0xff of every page so we can reliable page addresses
 115  * every 256 registers.
 116  *
 117  * The page_mutex lock must be held when this function is entered.
 118  *
 119  * Returns zero on success, non-zero on failure.
 120  */
 121 static int rmi_set_page(struct hid_device *hdev, u8 page)
 122 {
 123         struct rmi_data *data = hid_get_drvdata(hdev);
 124         int retval;
 125
 126         data->writeReport[0] = RMI_WRITE_REPORT_ID;
 127         data->writeReport[1] = 1;
 128         data->writeReport[2] = 0xFF;
 129         data->writeReport[4] = page;
 130
 131         retval = rmi_write_report(hdev, data->writeReport,
 132                         data->output_report_size);
 133         if (retval != data->output_report_size) {
 134                 dev_err(&hdev->dev,
 135                         "%s: set page failed: %d.", __func__, retval);
 136                 return retval;
 137         }
 138
 139         data->page = page;
 140         return 0;
 141 }
 142
 143 static int rmi_set_mode(struct hid_device *hdev, u8 mode)
 144 {
 145         int ret;
 146         const u8 txbuf[2] = {RMI_SET_RMI_MODE_REPORT_ID, mode};
 147         u8 *buf;
 148
 149         buf = kmemdup(txbuf, sizeof(txbuf), GFP_KERNEL);
 150         if (!buf)
 151                 return -ENOMEM;
 152
 153         ret = hid_hw_raw_request(hdev, RMI_SET_RMI_MODE_REPORT_ID, buf,
 154                         sizeof(txbuf), HID_FEATURE_REPORT, HID_REQ_SET_REPORT);
 155         kfree(buf);
 156         if (ret < 0) {
 157                 dev_err(&hdev->dev, "unable to set rmi mode to %d (%d)\n", mode,
 158                         ret);
 159                 return ret;
 160         }
 161
 162         return 0;
 163 }
 164
 165 static int rmi_write_report(struct hid_device *hdev, u8 *report, int len)
 166 {
 167         struct rmi_data *data = hid_get_drvdata(hdev);
 168         int ret;
 169
 170         if (data->device_flags & RMI_DEVICE_OUTPUT_SET_REPORT) {
 171                 /*
 172                  * Talk to device by using SET_REPORT requests instead.
 173                  */
 174                 ret = hid_hw_raw_request(hdev, report[0], report,
 175                                 len, HID_OUTPUT_REPORT, HID_REQ_SET_REPORT);
 176         } else {
 177                 ret = hid_hw_output_report(hdev, (void *)report, len);
 178         }
 179
 180         if (ret < 0) {
 181                 dev_err(&hdev->dev, "failed to write hid report (%d)\n", ret);
 182                 return ret;
 183         }
 184
 185         return ret;
 186 }
 187
 188 static int rmi_hid_read_block(struct rmi_transport_dev *xport, u16 addr,
 189                 void *buf, size_t len)
 190 {
 191         struct rmi_data *data = container_of(xport, struct rmi_data, xport);
 192         struct hid_device *hdev = data->hdev;
 193         int ret;
 194         int bytes_read;
 195         int bytes_needed;
 196         int retries;
 197         int read_input_count;
 198
 199         mutex_lock(&data->page_mutex);
 200
 201         if (RMI_PAGE(addr) != data->page) {
 202                 ret = rmi_set_page(hdev, RMI_PAGE(addr));
 203                 if (ret < 0)
 204                         goto exit;
 205         }
 206
 207         for (retries = 5; retries > 0; retries--) {
 208                 data->writeReport[0] = RMI_READ_ADDR_REPORT_ID;
 209                 data->writeReport[1] = 0; /* old 1 byte read count */
 210                 data->writeReport[2] = addr & 0xFF;
 211                 data->writeReport[3] = (addr >> 8) & 0xFF;
 212                 data->writeReport[4] = len  & 0xFF;
 213                 data->writeReport[5] = (len >> 8) & 0xFF;
 214
 215                 set_bit(RMI_READ_REQUEST_PENDING, &data->flags);
 216
 217                 ret = rmi_write_report(hdev, data->writeReport,
 218                                                 data->output_report_size);
 219                 if (ret != data->output_report_size) {
 220                         dev_err(&hdev->dev,
 221                                 "failed to write request output report (%d)\n",
 222                                 ret);
 223                         goto exit;
 224                 }
 225
 226                 bytes_read = 0;
 227                 bytes_needed = len;
 228                 while (bytes_read < len) {
 229                         if (!wait_event_timeout(data->wait,
 230                                 test_bit(RMI_READ_DATA_PENDING, &data->flags),
 231                                         msecs_to_jiffies(1000))) {
 232                                 hid_warn(hdev, "%s: timeout elapsed\n",
 233                                          __func__);
 234                                 ret = -EAGAIN;
 235                                 break;
 236                         }
 237
 238                         read_input_count = data->readReport[1];
 239                         memcpy(buf + bytes_read, &data->readReport[2],
 240                                 min(read_input_count, bytes_needed));
 241
 242                         bytes_read += read_input_count;
 243                         bytes_needed -= read_input_count;
 244                         clear_bit(RMI_READ_DATA_PENDING, &data->flags);
 245                 }
 246
 247                 if (ret >= 0) {
 248                         ret = 0;
 249                         break;
 250                 }
 251         }
 252
 253 exit:
 254         clear_bit(RMI_READ_REQUEST_PENDING, &data->flags);
 255         mutex_unlock(&data->page_mutex);
 256         return ret;
 257 }
 258
 259 static int rmi_hid_write_block(struct rmi_transport_dev *xport, u16 addr,
 260                 const void *buf, size_t len)
 261 {
 262         struct rmi_data *data = container_of(xport, struct rmi_data, xport);
 263         struct hid_device *hdev = data->hdev;
 264         int ret;
 265
 266         mutex_lock(&data->page_mutex);
 267
 268         if (RMI_PAGE(addr) != data->page) {
 269                 ret = rmi_set_page(hdev, RMI_PAGE(addr));
 270                 if (ret < 0)
 271                         goto exit;
 272         }
 273
 274         data->writeReport[0] = RMI_WRITE_REPORT_ID;
 275         data->writeReport[1] = len;
 276         data->writeReport[2] = addr & 0xFF;
 277         data->writeReport[3] = (addr >> 8) & 0xFF;
 278         memcpy(&data->writeReport[4], buf, len);
 279
 280         ret = rmi_write_report(hdev, data->writeReport,
 281                                         data->output_report_size);
 282         if (ret < 0) {
 283                 dev_err(&hdev->dev,
 284                         "failed to write request output report (%d)\n",
 285                         ret);
 286                 goto exit;
 287         }
 288         ret = 0;
 289
 290 exit:
 291         mutex_unlock(&data->page_mutex);
 292         return ret;
 293 }
 294
 295 static int rmi_reset_attn_mode(struct hid_device *hdev)
 296 {
 297         struct rmi_data *data = hid_get_drvdata(hdev);
 298         struct rmi_device *rmi_dev = data->xport.rmi_dev;
 299         int ret;
 300
 301         ret = rmi_set_mode(hdev, RMI_MODE_ATTN_REPORTS);
 302         if (ret)
 303                 return ret;
 304
 305         if (test_bit(RMI_STARTED, &data->flags))
 306                 ret = rmi_dev->driver->reset_handler(rmi_dev);
 307
 308         return ret;
 309 }
 310
 311 static void rmi_reset_work(struct work_struct *work)
 312 {
 313         struct rmi_data *hdata = container_of(work, struct rmi_data,
 314                                                 reset_work);
 315
 316         /* switch the device to RMI if we receive a generic mouse report */
 317         rmi_reset_attn_mode(hdata->hdev);
 318 }
 319
 320 static int rmi_input_event(struct hid_device *hdev, u8 *data, int size)
 321 {
 322         struct rmi_data *hdata = hid_get_drvdata(hdev);
 323         struct rmi_device *rmi_dev = hdata->xport.rmi_dev;
 324         unsigned long flags;
 325
 326         if (!(test_bit(RMI_STARTED, &hdata->flags)))
 327                 return 0;
 328
 329         pm_wakeup_event(hdev->dev.parent, 0);
 330
 331         local_irq_save(flags);
 332
 333         rmi_set_attn_data(rmi_dev, data[1], &data[2], size - 2);
 334
 335         generic_handle_irq(hdata->rmi_irq);
 336
 337         local_irq_restore(flags);
 338
 339         return 1;
 340 }
 341
 342 static int rmi_read_data_event(struct hid_device *hdev, u8 *data, int size)
 343 {
 344         struct rmi_data *hdata = hid_get_drvdata(hdev);
 345
 346         if (!test_bit(RMI_READ_REQUEST_PENDING, &hdata->flags)) {
 347                 hid_dbg(hdev, "no read request pending\n");
 348                 return 0;
 349         }
 350
 351         memcpy(hdata->readReport, data, min((u32)size, hdata->input_report_size));
 352         set_bit(RMI_READ_DATA_PENDING, &hdata->flags);
 353         wake_up(&hdata->wait);
 354
 355         return 1;
 356 }
 357
 358 static int rmi_check_sanity(struct hid_device *hdev, u8 *data, int size)
 359 {
 360         int valid_size = size;
 361         /*
 362          * On the Dell XPS 13 9333, the bus sometimes get confused and fills
 363          * the report with a sentinel value "ff". Synaptics told us that such
 364          * behavior does not comes from the touchpad itself, so we filter out
 365          * such reports here.
 366          */
 367
 368         while ((data[valid_size - 1] == 0xff) && valid_size > 0)
 369                 valid_size--;
 370
 371         return valid_size;
 372 }
 373
 374 static int rmi_raw_event(struct hid_device *hdev,
 375                 struct hid_report *report, u8 *data, int size)
 376 {
 377         struct rmi_data *hdata = hid_get_drvdata(hdev);
 378
 379         if (!(hdata->device_flags & RMI_DEVICE))
 380                 return 0;
 381
 382         size = rmi_check_sanity(hdev, data, size);
 383         if (size < 2)
 384                 return 0;
 385
 386         switch (data[0]) {
 387         case RMI_READ_DATA_REPORT_ID:
 388                 return rmi_read_data_event(hdev, data, size);
 389         case RMI_ATTN_REPORT_ID:
 390                 return rmi_input_event(hdev, data, size);
 391         default:
 392                 return 1;
 393         }
 394
 395         return 0;
 396 }
 397
 398 static int rmi_event(struct hid_device *hdev, struct hid_field *field,
 399                         struct hid_usage *usage, __s32 value)
 400 {
 401         struct rmi_data *data = hid_get_drvdata(hdev);
 402
 403         if ((data->device_flags & RMI_DEVICE) &&
 404             (field->application == HID_GD_POINTER ||
 405             field->application == HID_GD_MOUSE)) {
 406                 if (data->device_flags & RMI_DEVICE_HAS_PHYS_BUTTONS) {
 407                         if ((usage->hid & HID_USAGE_PAGE) == HID_UP_BUTTON)
 408                                 return 0;
 409
 410                         if ((usage->hid == HID_GD_X || usage->hid == HID_GD_Y)
 411                             && !value)
 412                                 return 1;
 413                 }
 414
 415                 schedule_work(&data->reset_work);
 416                 return 1;
 417         }
 418
 419         return 0;
 420 }
 421
 422 static void rmi_report(struct hid_device *hid, struct hid_report *report)
 423 {
 424         struct hid_field *field = report->field[0];
 425
 426         if (!(hid->claimed & HID_CLAIMED_INPUT))
 427                 return;
 428
 429         switch (report->id) {
 430         case RMI_READ_DATA_REPORT_ID:
 431         case RMI_ATTN_REPORT_ID:
 432                 return;
 433         }
 434
 435         if (field && field->hidinput && field->hidinput->input)
 436                 input_sync(field->hidinput->input);
 437 }
 438
 439 static int rmi_suspend(struct hid_device *hdev, pm_message_t message)
 440 {
 441         struct rmi_data *data = hid_get_drvdata(hdev);
 442         struct rmi_device *rmi_dev = data->xport.rmi_dev;
 443         int ret;
 444
 445         if (!(data->device_flags & RMI_DEVICE))
 446                 return 0;
 447
 448         ret = rmi_driver_suspend(rmi_dev, false);
 449         if (ret) {
 450                 hid_warn(hdev, "Failed to suspend device: %d\n", ret);
 451                 return ret;
 452         }
 453
 454         return 0;
 455 }
 456
 457 static int rmi_post_resume(struct hid_device *hdev)
 458 {
 459         struct rmi_data *data = hid_get_drvdata(hdev);
 460         struct rmi_device *rmi_dev = data->xport.rmi_dev;
 461         int ret;
 462
 463         if (!(data->device_flags & RMI_DEVICE))
 464                 return 0;
 465
 466         /* Make sure the HID device is ready to receive events */
 467         ret = hid_hw_open(hdev);
 468         if (ret)
 469                 return ret;
 470
 471         ret = rmi_reset_attn_mode(hdev);
 472         if (ret)
 473                 goto out;
 474
 475         ret = rmi_driver_resume(rmi_dev, false);
 476         if (ret) {
 477                 hid_warn(hdev, "Failed to resume device: %d\n", ret);
 478                 goto out;
 479         }
 480
 481 out:
 482         hid_hw_close(hdev);
 483         return ret;
 484 }
 485
 486 static int rmi_hid_reset(struct rmi_transport_dev *xport, u16 reset_addr)
 487 {
 488         struct rmi_data *data = container_of(xport, struct rmi_data, xport);
 489         struct hid_device *hdev = data->hdev;
 490
 491         return rmi_reset_attn_mode(hdev);
 492 }
 493
 494 static int rmi_input_configured(struct hid_device *hdev, struct hid_input *hi)
 495 {
 496         struct rmi_data *data = hid_get_drvdata(hdev);
 497         struct input_dev *input = hi->input;
 498         int ret = 0;
 499
 500         if (!(data->device_flags & RMI_DEVICE))
 501                 return 0;
 502
 503         data->xport.input = input;
 504
 505         hid_dbg(hdev, "Opening low level driver\n");
 506         ret = hid_hw_open(hdev);
 507         if (ret)
 508                 return ret;
 509
 510         /* Allow incoming hid reports */
 511         hid_device_io_start(hdev);
 512
 513         ret = rmi_set_mode(hdev, RMI_MODE_ATTN_REPORTS);
 514         if (ret < 0) {
 515                 dev_err(&hdev->dev, "failed to set rmi mode\n");
 516                 goto exit;
 517         }
 518
 519         ret = rmi_set_page(hdev, 0);
 520         if (ret < 0) {
 521                 dev_err(&hdev->dev, "failed to set page select to 0.\n");
 522                 goto exit;
 523         }
 524
 525         ret = rmi_register_transport_device(&data->xport);
 526         if (ret < 0) {
 527                 dev_err(&hdev->dev, "failed to register transport driver\n");
 528                 goto exit;
 529         }
 530
 531         set_bit(RMI_STARTED, &data->flags);
 532
 533 exit:
 534         hid_device_io_stop(hdev);
 535         hid_hw_close(hdev);
 536         return ret;
 537 }
 538
 539 static int rmi_input_mapping(struct hid_device *hdev,
 540                 struct hid_input *hi, struct hid_field *field,
 541                 struct hid_usage *usage, unsigned long **bit, int *max)
 542 {
 543         struct rmi_data *data = hid_get_drvdata(hdev);
 544
 545         /*
 546          * we want to make HID ignore the advertised HID collection
 547          * for RMI deivces
 548          */
 549         if (data->device_flags & RMI_DEVICE) {
 550                 if ((data->device_flags & RMI_DEVICE_HAS_PHYS_BUTTONS) &&
 551                     ((usage->hid & HID_USAGE_PAGE) == HID_UP_BUTTON))
 552                         return 0;
 553
 554                 return -1;
 555         }
 556
 557         return 0;
 558 }
 559
 560 static int rmi_check_valid_report_id(struct hid_device *hdev, unsigned type,
 561                 unsigned id, struct hid_report **report)
 562 {
 563         int i;
 564
 565         *report = hdev->report_enum[type].report_id_hash[id];
 566         if (*report) {
 567                 for (i = 0; i < (*report)->maxfield; i++) {
 568                         unsigned app = (*report)->field[i]->application;
 569                         if ((app & HID_USAGE_PAGE) >= HID_UP_MSVENDOR)
 570                                 return 1;
 571                 }
 572         }
 573
 574         return 0;
 575 }
 576
 577 static struct rmi_device_platform_data rmi_hid_pdata = {
 578         .sensor_pdata = {
 579                 .sensor_type = rmi_sensor_touchpad,
 580                 .axis_align.flip_y = true,
 581                 .dribble = RMI_REG_STATE_ON,
 582                 .palm_detect = RMI_REG_STATE_OFF,
 583         },
 584 };
 585
 586 static const struct rmi_transport_ops hid_rmi_ops = {
 587         .write_block    = rmi_hid_write_block,
 588         .read_block     = rmi_hid_read_block,
 589         .reset          = rmi_hid_reset,
 590 };
 591
 592 static void rmi_irq_teardown(void *data)
 593 {
 594         struct rmi_data *hdata = data;
 595         struct irq_domain *domain = hdata->domain;
 596
 597         if (!domain)
 598                 return;
 599
 600         irq_dispose_mapping(irq_find_mapping(domain, 0));
 601
 602         irq_domain_remove(domain);
 603         hdata->domain = NULL;
 604         hdata->rmi_irq = 0;
 605 }
 606
 607 static int rmi_irq_map(struct irq_domain *h, unsigned int virq,
 608                        irq_hw_number_t hw_irq_num)
 609 {
 610         irq_set_chip_and_handler(virq, &dummy_irq_chip, handle_simple_irq);
 611
 612         return 0;
 613 }
 614
 615 static const struct irq_domain_ops rmi_irq_ops = {
 616         .map = rmi_irq_map,
 617 };
 618
 619 static int rmi_setup_irq_domain(struct hid_device *hdev)
 620 {
 621         struct rmi_data *hdata = hid_get_drvdata(hdev);
 622         int ret;
 623
 624         hdata->domain = irq_domain_create_linear(hdev->dev.fwnode, 1,
 625                                                  &rmi_irq_ops, hdata);
 626         if (!hdata->domain)
 627                 return -ENOMEM;
 628
 629         ret = devm_add_action_or_reset(&hdev->dev, &rmi_irq_teardown, hdata);
 630         if (ret)
 631                 return ret;
 632
 633         hdata->rmi_irq = irq_create_mapping(hdata->domain, 0);
 634         if (hdata->rmi_irq <= 0) {
 635                 hid_err(hdev, "Can't allocate an IRQ\n");
 636                 return hdata->rmi_irq < 0 ? hdata->rmi_irq : -ENXIO;
 637         }
 638
 639         return 0;
 640 }
 641
 642 static int rmi_probe(struct hid_device *hdev, const struct hid_device_id *id)
 643 {
 644         struct rmi_data *data = NULL;
 645         int ret;
 646         size_t alloc_size;
 647         struct hid_report *input_report;
 648         struct hid_report *output_report;
 649         struct hid_report *feature_report;
 650
 651         data = devm_kzalloc(&hdev->dev, sizeof(struct rmi_data), GFP_KERNEL);
 652         if (!data)
 653                 return -ENOMEM;
 654
 655         INIT_WORK(&data->reset_work, rmi_reset_work);
 656         data->hdev = hdev;
 657
 658         hid_set_drvdata(hdev, data);
 659
 660         hdev->quirks |= HID_QUIRK_NO_INIT_REPORTS;
 661         hdev->quirks |= HID_QUIRK_NO_INPUT_SYNC;
 662
 663         ret = hid_parse(hdev);
 664         if (ret) {
 665                 hid_err(hdev, "parse failed\n");
 666                 return ret;
 667         }
 668
 669         if (id->driver_data)
 670                 data->device_flags = id->driver_data;
 671
 672         /*
 673          * Check for the RMI specific report ids. If they are misisng
 674          * simply return and let the events be processed by hid-input
 675          */
 676         if (!rmi_check_valid_report_id(hdev, HID_FEATURE_REPORT,
 677             RMI_SET_RMI_MODE_REPORT_ID, &feature_report)) {
 678                 hid_dbg(hdev, "device does not have set mode feature report\n");
 679                 goto start;
 680         }
 681
 682         if (!rmi_check_valid_report_id(hdev, HID_INPUT_REPORT,
 683             RMI_ATTN_REPORT_ID, &input_report)) {
 684                 hid_dbg(hdev, "device does not have attention input report\n");
 685                 goto start;
 686         }
 687
 688         data->input_report_size = hid_report_len(input_report);
 689
 690         if (!rmi_check_valid_report_id(hdev, HID_OUTPUT_REPORT,
 691             RMI_WRITE_REPORT_ID, &output_report)) {
 692                 hid_dbg(hdev,
 693                         "device does not have rmi write output report\n");
 694                 goto start;
 695         }
 696
 697         data->output_report_size = hid_report_len(output_report);
 698
 699         data->device_flags |= RMI_DEVICE;
 700         alloc_size = data->output_report_size + data->input_report_size;
 701
 702         data->writeReport = devm_kzalloc(&hdev->dev, alloc_size, GFP_KERNEL);
 703         if (!data->writeReport) {
 704                 hid_err(hdev, "failed to allocate buffer for HID reports\n");
 705                 return -ENOMEM;
 706         }
 707
 708         data->readReport = data->writeReport + data->output_report_size;
 709
 710         init_waitqueue_head(&data->wait);
 711
 712         mutex_init(&data->page_mutex);
 713
 714         ret = rmi_setup_irq_domain(hdev);
 715         if (ret) {
 716                 hid_err(hdev, "failed to allocate IRQ domain\n");
 717                 return ret;
 718         }
 719
 720         if (data->device_flags & RMI_DEVICE_HAS_PHYS_BUTTONS)
 721                 rmi_hid_pdata.gpio_data.disable = true;
 722
 723         data->xport.dev = hdev->dev.parent;
 724         data->xport.pdata = rmi_hid_pdata;
 725         data->xport.pdata.irq = data->rmi_irq;
 726         data->xport.proto_name = "hid";
 727         data->xport.ops = &hid_rmi_ops;
 728
 729 start:
 730         ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
 731         if (ret) {
 732                 hid_err(hdev, "hw start failed\n");
 733                 return ret;
 734         }
 735
 736         return 0;
 737 }
 738
 739 static void rmi_remove(struct hid_device *hdev)
 740 {
 741         struct rmi_data *hdata = hid_get_drvdata(hdev);
 742
 743         if ((hdata->device_flags & RMI_DEVICE)
 744             && test_bit(RMI_STARTED, &hdata->flags)) {
 745                 clear_bit(RMI_STARTED, &hdata->flags);
 746                 cancel_work_sync(&hdata->reset_work);
 747                 rmi_unregister_transport_device(&hdata->xport);
 748         }
 749
 750         hid_hw_stop(hdev);
 751 }
 752
 753 static const struct hid_device_id rmi_id[] = {
 754         { HID_USB_DEVICE(USB_VENDOR_ID_RAZER, USB_DEVICE_ID_RAZER_BLADE_14),
 755                 .driver_data = RMI_DEVICE_HAS_PHYS_BUTTONS },
 756         { HID_USB_DEVICE(USB_VENDOR_ID_LENOVO, USB_DEVICE_ID_LENOVO_X1_COVER) },
 757         { HID_USB_DEVICE(USB_VENDOR_ID_PRIMAX, USB_DEVICE_ID_PRIMAX_REZEL) },
 758         { HID_USB_DEVICE(USB_VENDOR_ID_SYNAPTICS, USB_DEVICE_ID_SYNAPTICS_ACER_SWITCH5),
 759                 .driver_data = RMI_DEVICE_OUTPUT_SET_REPORT },
 760         { HID_DEVICE(HID_BUS_ANY, HID_GROUP_RMI, HID_ANY_ID, HID_ANY_ID) },
 761         { }
 762 };
 763 MODULE_DEVICE_TABLE(hid, rmi_id);
 764
 765 static struct hid_driver rmi_driver = {
 766         .name = "hid-rmi",
 767         .id_table               = rmi_id,
 768         .probe                  = rmi_probe,
 769         .remove                 = rmi_remove,
 770         .event                  = rmi_event,
 771         .raw_event              = rmi_raw_event,
 772         .report                 = rmi_report,
 773         .input_mapping          = rmi_input_mapping,
 774         .input_configured       = rmi_input_configured,
 775         .suspend                = pm_ptr(rmi_suspend),
 776         .resume                 = pm_ptr(rmi_post_resume),
 777         .reset_resume           = pm_ptr(rmi_post_resume),
 778 };
 779
 780 module_hid_driver(rmi_driver);
 781
 782 MODULE_AUTHOR("Andrew Duggan <aduggan@synaptics.com>");
 783 MODULE_DESCRIPTION("RMI HID driver");
 784 MODULE_LICENSE("GPL");