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 #ifdef CONFIG_PM
 440 static int rmi_suspend(struct hid_device *hdev, pm_message_t message)
 441 {
 442         struct rmi_data *data = hid_get_drvdata(hdev);
 443         struct rmi_device *rmi_dev = data->xport.rmi_dev;
 444         int ret;
 445
 446         if (!(data->device_flags & RMI_DEVICE))
 447                 return 0;
 448
 449         ret = rmi_driver_suspend(rmi_dev, false);
 450         if (ret) {
 451                 hid_warn(hdev, "Failed to suspend device: %d\n", ret);
 452                 return ret;
 453         }
 454
 455         return 0;
 456 }
 457
 458 static int rmi_post_resume(struct hid_device *hdev)
 459 {
 460         struct rmi_data *data = hid_get_drvdata(hdev);
 461         struct rmi_device *rmi_dev = data->xport.rmi_dev;
 462         int ret;
 463
 464         if (!(data->device_flags & RMI_DEVICE))
 465                 return 0;
 466
 467         /* Make sure the HID device is ready to receive events */
 468         ret = hid_hw_open(hdev);
 469         if (ret)
 470                 return ret;
 471
 472         ret = rmi_reset_attn_mode(hdev);
 473         if (ret)
 474                 goto out;
 475
 476         ret = rmi_driver_resume(rmi_dev, false);
 477         if (ret) {
 478                 hid_warn(hdev, "Failed to resume device: %d\n", ret);
 479                 goto out;
 480         }
 481
 482 out:
 483         hid_hw_close(hdev);
 484         return ret;
 485 }
 486 #endif /* CONFIG_PM */
 487
 488 static int rmi_hid_reset(struct rmi_transport_dev *xport, u16 reset_addr)
 489 {
 490         struct rmi_data *data = container_of(xport, struct rmi_data, xport);
 491         struct hid_device *hdev = data->hdev;
 492
 493         return rmi_reset_attn_mode(hdev);
 494 }
 495
 496 static int rmi_input_configured(struct hid_device *hdev, struct hid_input *hi)
 497 {
 498         struct rmi_data *data = hid_get_drvdata(hdev);
 499         struct input_dev *input = hi->input;
 500         int ret = 0;
 501
 502         if (!(data->device_flags & RMI_DEVICE))
 503                 return 0;
 504
 505         data->xport.input = input;
 506
 507         hid_dbg(hdev, "Opening low level driver\n");
 508         ret = hid_hw_open(hdev);
 509         if (ret)
 510                 return ret;
 511
 512         /* Allow incoming hid reports */
 513         hid_device_io_start(hdev);
 514
 515         ret = rmi_set_mode(hdev, RMI_MODE_ATTN_REPORTS);
 516         if (ret < 0) {
 517                 dev_err(&hdev->dev, "failed to set rmi mode\n");
 518                 goto exit;
 519         }
 520
 521         ret = rmi_set_page(hdev, 0);
 522         if (ret < 0) {
 523                 dev_err(&hdev->dev, "failed to set page select to 0.\n");
 524                 goto exit;
 525         }
 526
 527         ret = rmi_register_transport_device(&data->xport);
 528         if (ret < 0) {
 529                 dev_err(&hdev->dev, "failed to register transport driver\n");
 530                 goto exit;
 531         }
 532
 533         set_bit(RMI_STARTED, &data->flags);
 534
 535 exit:
 536         hid_device_io_stop(hdev);
 537         hid_hw_close(hdev);
 538         return ret;
 539 }
 540
 541 static int rmi_input_mapping(struct hid_device *hdev,
 542                 struct hid_input *hi, struct hid_field *field,
 543                 struct hid_usage *usage, unsigned long **bit, int *max)
 544 {
 545         struct rmi_data *data = hid_get_drvdata(hdev);
 546
 547         /*
 548          * we want to make HID ignore the advertised HID collection
 549          * for RMI deivces
 550          */
 551         if (data->device_flags & RMI_DEVICE) {
 552                 if ((data->device_flags & RMI_DEVICE_HAS_PHYS_BUTTONS) &&
 553                     ((usage->hid & HID_USAGE_PAGE) == HID_UP_BUTTON))
 554                         return 0;
 555
 556                 return -1;
 557         }
 558
 559         return 0;
 560 }
 561
 562 static int rmi_check_valid_report_id(struct hid_device *hdev, unsigned type,
 563                 unsigned id, struct hid_report **report)
 564 {
 565         int i;
 566
 567         *report = hdev->report_enum[type].report_id_hash[id];
 568         if (*report) {
 569                 for (i = 0; i < (*report)->maxfield; i++) {
 570                         unsigned app = (*report)->field[i]->application;
 571                         if ((app & HID_USAGE_PAGE) >= HID_UP_MSVENDOR)
 572                                 return 1;
 573                 }
 574         }
 575
 576         return 0;
 577 }
 578
 579 static struct rmi_device_platform_data rmi_hid_pdata = {
 580         .sensor_pdata = {
 581                 .sensor_type = rmi_sensor_touchpad,
 582                 .axis_align.flip_y = true,
 583                 .dribble = RMI_REG_STATE_ON,
 584                 .palm_detect = RMI_REG_STATE_OFF,
 585         },
 586 };
 587
 588 static const struct rmi_transport_ops hid_rmi_ops = {
 589         .write_block    = rmi_hid_write_block,
 590         .read_block     = rmi_hid_read_block,
 591         .reset          = rmi_hid_reset,
 592 };
 593
 594 static void rmi_irq_teardown(void *data)
 595 {
 596         struct rmi_data *hdata = data;
 597         struct irq_domain *domain = hdata->domain;
 598
 599         if (!domain)
 600                 return;
 601
 602         irq_dispose_mapping(irq_find_mapping(domain, 0));
 603
 604         irq_domain_remove(domain);
 605         hdata->domain = NULL;
 606         hdata->rmi_irq = 0;
 607 }
 608
 609 static int rmi_irq_map(struct irq_domain *h, unsigned int virq,
 610                        irq_hw_number_t hw_irq_num)
 611 {
 612         irq_set_chip_and_handler(virq, &dummy_irq_chip, handle_simple_irq);
 613
 614         return 0;
 615 }
 616
 617 static const struct irq_domain_ops rmi_irq_ops = {
 618         .map = rmi_irq_map,
 619 };
 620
 621 static int rmi_setup_irq_domain(struct hid_device *hdev)
 622 {
 623         struct rmi_data *hdata = hid_get_drvdata(hdev);
 624         int ret;
 625
 626         hdata->domain = irq_domain_create_linear(hdev->dev.fwnode, 1,
 627                                                  &rmi_irq_ops, hdata);
 628         if (!hdata->domain)
 629                 return -ENOMEM;
 630
 631         ret = devm_add_action_or_reset(&hdev->dev, &rmi_irq_teardown, hdata);
 632         if (ret)
 633                 return ret;
 634
 635         hdata->rmi_irq = irq_create_mapping(hdata->domain, 0);
 636         if (hdata->rmi_irq <= 0) {
 637                 hid_err(hdev, "Can't allocate an IRQ\n");
 638                 return hdata->rmi_irq < 0 ? hdata->rmi_irq : -ENXIO;
 639         }
 640
 641         return 0;
 642 }
 643
 644 static int rmi_probe(struct hid_device *hdev, const struct hid_device_id *id)
 645 {
 646         struct rmi_data *data = NULL;
 647         int ret;
 648         size_t alloc_size;
 649         struct hid_report *input_report;
 650         struct hid_report *output_report;
 651         struct hid_report *feature_report;
 652
 653         data = devm_kzalloc(&hdev->dev, sizeof(struct rmi_data), GFP_KERNEL);
 654         if (!data)
 655                 return -ENOMEM;
 656
 657         INIT_WORK(&data->reset_work, rmi_reset_work);
 658         data->hdev = hdev;
 659
 660         hid_set_drvdata(hdev, data);
 661
 662         hdev->quirks |= HID_QUIRK_NO_INIT_REPORTS;
 663         hdev->quirks |= HID_QUIRK_NO_INPUT_SYNC;
 664
 665         ret = hid_parse(hdev);
 666         if (ret) {
 667                 hid_err(hdev, "parse failed\n");
 668                 return ret;
 669         }
 670
 671         if (id->driver_data)
 672                 data->device_flags = id->driver_data;
 673
 674         /*
 675          * Check for the RMI specific report ids. If they are misisng
 676          * simply return and let the events be processed by hid-input
 677          */
 678         if (!rmi_check_valid_report_id(hdev, HID_FEATURE_REPORT,
 679             RMI_SET_RMI_MODE_REPORT_ID, &feature_report)) {
 680                 hid_dbg(hdev, "device does not have set mode feature report\n");
 681                 goto start;
 682         }
 683
 684         if (!rmi_check_valid_report_id(hdev, HID_INPUT_REPORT,
 685             RMI_ATTN_REPORT_ID, &input_report)) {
 686                 hid_dbg(hdev, "device does not have attention input report\n");
 687                 goto start;
 688         }
 689
 690         data->input_report_size = hid_report_len(input_report);
 691
 692         if (!rmi_check_valid_report_id(hdev, HID_OUTPUT_REPORT,
 693             RMI_WRITE_REPORT_ID, &output_report)) {
 694                 hid_dbg(hdev,
 695                         "device does not have rmi write output report\n");
 696                 goto start;
 697         }
 698
 699         data->output_report_size = hid_report_len(output_report);
 700
 701         data->device_flags |= RMI_DEVICE;
 702         alloc_size = data->output_report_size + data->input_report_size;
 703
 704         data->writeReport = devm_kzalloc(&hdev->dev, alloc_size, GFP_KERNEL);
 705         if (!data->writeReport) {
 706                 hid_err(hdev, "failed to allocate buffer for HID reports\n");
 707                 return -ENOMEM;
 708         }
 709
 710         data->readReport = data->writeReport + data->output_report_size;
 711
 712         init_waitqueue_head(&data->wait);
 713
 714         mutex_init(&data->page_mutex);
 715
 716         ret = rmi_setup_irq_domain(hdev);
 717         if (ret) {
 718                 hid_err(hdev, "failed to allocate IRQ domain\n");
 719                 return ret;
 720         }
 721
 722         if (data->device_flags & RMI_DEVICE_HAS_PHYS_BUTTONS)
 723                 rmi_hid_pdata.gpio_data.disable = true;
 724
 725         data->xport.dev = hdev->dev.parent;
 726         data->xport.pdata = rmi_hid_pdata;
 727         data->xport.pdata.irq = data->rmi_irq;
 728         data->xport.proto_name = "hid";
 729         data->xport.ops = &hid_rmi_ops;
 730
 731 start:
 732         ret = hid_hw_start(hdev, HID_CONNECT_DEFAULT);
 733         if (ret) {
 734                 hid_err(hdev, "hw start failed\n");
 735                 return ret;
 736         }
 737
 738         return 0;
 739 }
 740
 741 static void rmi_remove(struct hid_device *hdev)
 742 {
 743         struct rmi_data *hdata = hid_get_drvdata(hdev);
 744
 745         if ((hdata->device_flags & RMI_DEVICE)
 746             && test_bit(RMI_STARTED, &hdata->flags)) {
 747                 clear_bit(RMI_STARTED, &hdata->flags);
 748                 cancel_work_sync(&hdata->reset_work);
 749                 rmi_unregister_transport_device(&hdata->xport);
 750         }
 751
 752         hid_hw_stop(hdev);
 753 }
 754
 755 static const struct hid_device_id rmi_id[] = {
 756         { HID_USB_DEVICE(USB_VENDOR_ID_RAZER, USB_DEVICE_ID_RAZER_BLADE_14),
 757                 .driver_data = RMI_DEVICE_HAS_PHYS_BUTTONS },
 758         { HID_USB_DEVICE(USB_VENDOR_ID_LENOVO, USB_DEVICE_ID_LENOVO_X1_COVER) },
 759         { HID_USB_DEVICE(USB_VENDOR_ID_PRIMAX, USB_DEVICE_ID_PRIMAX_REZEL) },
 760         { HID_USB_DEVICE(USB_VENDOR_ID_SYNAPTICS, USB_DEVICE_ID_SYNAPTICS_ACER_SWITCH5),
 761                 .driver_data = RMI_DEVICE_OUTPUT_SET_REPORT },
 762         { HID_DEVICE(HID_BUS_ANY, HID_GROUP_RMI, HID_ANY_ID, HID_ANY_ID) },
 763         { }
 764 };
 765 MODULE_DEVICE_TABLE(hid, rmi_id);
 766
 767 static struct hid_driver rmi_driver = {
 768         .name = "hid-rmi",
 769         .id_table               = rmi_id,
 770         .probe                  = rmi_probe,
 771         .remove                 = rmi_remove,
 772         .event                  = rmi_event,
 773         .raw_event              = rmi_raw_event,
 774         .report                 = rmi_report,
 775         .input_mapping          = rmi_input_mapping,
 776         .input_configured       = rmi_input_configured,
 777 #ifdef CONFIG_PM
 778         .suspend                = rmi_suspend,
 779         .resume                 = rmi_post_resume,
 780         .reset_resume           = rmi_post_resume,
 781 #endif
 782 };
 783
 784 module_hid_driver(rmi_driver);
 785
 786 MODULE_AUTHOR("Andrew Duggan <aduggan@synaptics.com>");
 787 MODULE_DESCRIPTION("RMI HID driver");
 788 MODULE_LICENSE("GPL");