drivers/hid/i2c-hid/i2c-hid-core.c

   1 /*
   2  * HID over I2C protocol implementation
   3  *
   4  * Copyright (c) 2012 Benjamin Tissoires <benjamin.tissoires@gmail.com>
   5  * Copyright (c) 2012 Ecole Nationale de l'Aviation Civile, France
   6  * Copyright (c) 2012 Red Hat, Inc
   7  *
   8  * This code is partly based on "USB HID support for Linux":
   9  *
  10  *  Copyright (c) 1999 Andreas Gal
  11  *  Copyright (c) 2000-2005 Vojtech Pavlik <vojtech@suse.cz>
  12  *  Copyright (c) 2005 Michael Haboustak <mike-@cinci.rr.com> for Concept2, Inc
  13  *  Copyright (c) 2007-2008 Oliver Neukum
  14  *  Copyright (c) 2006-2010 Jiri Kosina
  15  *
  16  * This file is subject to the terms and conditions of the GNU General Public
  17  * License.  See the file COPYING in the main directory of this archive for
  18  * more details.
  19  */
  20
  21 #include <linux/module.h>
  22 #include <linux/i2c.h>
  23 #include <linux/interrupt.h>
  24 #include <linux/input.h>
  25 #include <linux/irq.h>
  26 #include <linux/delay.h>
  27 #include <linux/slab.h>
  28 #include <linux/pm.h>
  29 #include <linux/pm_runtime.h>
  30 #include <linux/device.h>
  31 #include <linux/wait.h>
  32 #include <linux/err.h>
  33 #include <linux/string.h>
  34 #include <linux/list.h>
  35 #include <linux/jiffies.h>
  36 #include <linux/kernel.h>
  37 #include <linux/hid.h>
  38 #include <linux/mutex.h>
  39 #include <linux/acpi.h>
  40 #include <linux/of.h>
  41 #include <linux/regulator/consumer.h>
  42
  43 #include <linux/platform_data/i2c-hid.h>
  44
  45 #include "../hid-ids.h"
  46 #include "i2c-hid.h"
  47
  48 /* quirks to control the device */
  49 #define I2C_HID_QUIRK_SET_PWR_WAKEUP_DEV        BIT(0)
  50
  51 /* flags */
  52 #define I2C_HID_STARTED         0
  53 #define I2C_HID_RESET_PENDING   1
  54 #define I2C_HID_READ_PENDING    2
  55
  56 #define I2C_HID_PWR_ON          0x00
  57 #define I2C_HID_PWR_SLEEP       0x01
  58
  59 /* debug option */
  60 static bool debug;
  61 module_param(debug, bool, 0444);
  62 MODULE_PARM_DESC(debug, "print a lot of debug information");
  63
  64 #define i2c_hid_dbg(ihid, fmt, arg...)                                    \
  65 do {                                                                      \
  66         if (debug)                                                        \
  67                 dev_printk(KERN_DEBUG, &(ihid)->client->dev, fmt, ##arg); \
  68 } while (0)
  69
  70 struct i2c_hid_desc {
  71         __le16 wHIDDescLength;
  72         __le16 bcdVersion;
  73         __le16 wReportDescLength;
  74         __le16 wReportDescRegister;
  75         __le16 wInputRegister;
  76         __le16 wMaxInputLength;
  77         __le16 wOutputRegister;
  78         __le16 wMaxOutputLength;
  79         __le16 wCommandRegister;
  80         __le16 wDataRegister;
  81         __le16 wVendorID;
  82         __le16 wProductID;
  83         __le16 wVersionID;
  84         __le32 reserved;
  85 } __packed;
  86
  87 struct i2c_hid_cmd {
  88         unsigned int registerIndex;
  89         __u8 opcode;
  90         unsigned int length;
  91         bool wait;
  92 };
  93
  94 union command {
  95         u8 data[0];
  96         struct cmd {
  97                 __le16 reg;
  98                 __u8 reportTypeID;
  99                 __u8 opcode;
 100         } __packed c;
 101 };
 102
 103 #define I2C_HID_CMD(opcode_) \
 104         .opcode = opcode_, .length = 4, \
 105         .registerIndex = offsetof(struct i2c_hid_desc, wCommandRegister)
 106
 107 /* fetch HID descriptor */
 108 static const struct i2c_hid_cmd hid_descr_cmd = { .length = 2 };
 109 /* fetch report descriptors */
 110 static const struct i2c_hid_cmd hid_report_descr_cmd = {
 111                 .registerIndex = offsetof(struct i2c_hid_desc,
 112                         wReportDescRegister),
 113                 .opcode = 0x00,
 114                 .length = 2 };
 115 /* commands */
 116 static const struct i2c_hid_cmd hid_reset_cmd =         { I2C_HID_CMD(0x01),
 117                                                           .wait = true };
 118 static const struct i2c_hid_cmd hid_get_report_cmd =    { I2C_HID_CMD(0x02) };
 119 static const struct i2c_hid_cmd hid_set_report_cmd =    { I2C_HID_CMD(0x03) };
 120 static const struct i2c_hid_cmd hid_set_power_cmd =     { I2C_HID_CMD(0x08) };
 121 static const struct i2c_hid_cmd hid_no_cmd =            { .length = 0 };
 122
 123 /*
 124  * These definitions are not used here, but are defined by the spec.
 125  * Keeping them here for documentation purposes.
 126  *
 127  * static const struct i2c_hid_cmd hid_get_idle_cmd = { I2C_HID_CMD(0x04) };
 128  * static const struct i2c_hid_cmd hid_set_idle_cmd = { I2C_HID_CMD(0x05) };
 129  * static const struct i2c_hid_cmd hid_get_protocol_cmd = { I2C_HID_CMD(0x06) };
 130  * static const struct i2c_hid_cmd hid_set_protocol_cmd = { I2C_HID_CMD(0x07) };
 131  */
 132
 133 static DEFINE_MUTEX(i2c_hid_open_mut);
 134
 135 /* The main device structure */
 136 struct i2c_hid {
 137         struct i2c_client       *client;        /* i2c client */
 138         struct hid_device       *hid;   /* pointer to corresponding HID dev */
 139         union {
 140                 __u8 hdesc_buffer[sizeof(struct i2c_hid_desc)];
 141                 struct i2c_hid_desc hdesc;      /* the HID Descriptor */
 142         };
 143         __le16                  wHIDDescRegister; /* location of the i2c
 144                                                    * register of the HID
 145                                                    * descriptor. */
 146         unsigned int            bufsize;        /* i2c buffer size */
 147         u8                      *inbuf;         /* Input buffer */
 148         u8                      *rawbuf;        /* Raw Input buffer */
 149         u8                      *cmdbuf;        /* Command buffer */
 150         u8                      *argsbuf;       /* Command arguments buffer */
 151
 152         unsigned long           flags;          /* device flags */
 153         unsigned long           quirks;         /* Various quirks */
 154
 155         wait_queue_head_t       wait;           /* For waiting the interrupt */
 156
 157         struct i2c_hid_platform_data pdata;
 158
 159         bool                    irq_wake_enabled;
 160         struct mutex            reset_lock;
 161 };
 162
 163 static const struct i2c_hid_quirks {
 164         __u16 idVendor;
 165         __u16 idProduct;
 166         __u32 quirks;
 167 } i2c_hid_quirks[] = {
 168         { USB_VENDOR_ID_WEIDA, USB_DEVICE_ID_WEIDA_8752,
 169                 I2C_HID_QUIRK_SET_PWR_WAKEUP_DEV },
 170         { USB_VENDOR_ID_WEIDA, USB_DEVICE_ID_WEIDA_8755,
 171                 I2C_HID_QUIRK_SET_PWR_WAKEUP_DEV },
 172         { 0, 0 }
 173 };
 174
 175 /*
 176  * i2c_hid_lookup_quirk: return any quirks associated with a I2C HID device
 177  * @idVendor: the 16-bit vendor ID
 178  * @idProduct: the 16-bit product ID
 179  *
 180  * Returns: a u32 quirks value.
 181  */
 182 static u32 i2c_hid_lookup_quirk(const u16 idVendor, const u16 idProduct)
 183 {
 184         u32 quirks = 0;
 185         int n;
 186
 187         for (n = 0; i2c_hid_quirks[n].idVendor; n++)
 188                 if (i2c_hid_quirks[n].idVendor == idVendor &&
 189                     (i2c_hid_quirks[n].idProduct == (__u16)HID_ANY_ID ||
 190                      i2c_hid_quirks[n].idProduct == idProduct))
 191                         quirks = i2c_hid_quirks[n].quirks;
 192
 193         return quirks;
 194 }
 195
 196 static int __i2c_hid_command(struct i2c_client *client,
 197                 const struct i2c_hid_cmd *command, u8 reportID,
 198                 u8 reportType, u8 *args, int args_len,
 199                 unsigned char *buf_recv, int data_len)
 200 {
 201         struct i2c_hid *ihid = i2c_get_clientdata(client);
 202         union command *cmd = (union command *)ihid->cmdbuf;
 203         int ret;
 204         struct i2c_msg msg[2];
 205         int msg_num = 1;
 206
 207         int length = command->length;
 208         bool wait = command->wait;
 209         unsigned int registerIndex = command->registerIndex;
 210
 211         /* special case for hid_descr_cmd */
 212         if (command == &hid_descr_cmd) {
 213                 cmd->c.reg = ihid->wHIDDescRegister;
 214         } else {
 215                 cmd->data[0] = ihid->hdesc_buffer[registerIndex];
 216                 cmd->data[1] = ihid->hdesc_buffer[registerIndex + 1];
 217         }
 218
 219         if (length > 2) {
 220                 cmd->c.opcode = command->opcode;
 221                 cmd->c.reportTypeID = reportID | reportType << 4;
 222         }
 223
 224         memcpy(cmd->data + length, args, args_len);
 225         length += args_len;
 226
 227         i2c_hid_dbg(ihid, "%s: cmd=%*ph\n", __func__, length, cmd->data);
 228
 229         msg[0].addr = client->addr;
 230         msg[0].flags = client->flags & I2C_M_TEN;
 231         msg[0].len = length;
 232         msg[0].buf = cmd->data;
 233         if (data_len > 0) {
 234                 msg[1].addr = client->addr;
 235                 msg[1].flags = client->flags & I2C_M_TEN;
 236                 msg[1].flags |= I2C_M_RD;
 237                 msg[1].len = data_len;
 238                 msg[1].buf = buf_recv;
 239                 msg_num = 2;
 240                 set_bit(I2C_HID_READ_PENDING, &ihid->flags);
 241         }
 242
 243         if (wait)
 244                 set_bit(I2C_HID_RESET_PENDING, &ihid->flags);
 245
 246         ret = i2c_transfer(client->adapter, msg, msg_num);
 247
 248         if (data_len > 0)
 249                 clear_bit(I2C_HID_READ_PENDING, &ihid->flags);
 250
 251         if (ret != msg_num)
 252                 return ret < 0 ? ret : -EIO;
 253
 254         ret = 0;
 255
 256         if (wait) {
 257                 i2c_hid_dbg(ihid, "%s: waiting...\n", __func__);
 258                 if (!wait_event_timeout(ihid->wait,
 259                                 !test_bit(I2C_HID_RESET_PENDING, &ihid->flags),
 260                                 msecs_to_jiffies(5000)))
 261                         ret = -ENODATA;
 262                 i2c_hid_dbg(ihid, "%s: finished.\n", __func__);
 263         }
 264
 265         return ret;
 266 }
 267
 268 static int i2c_hid_command(struct i2c_client *client,
 269                 const struct i2c_hid_cmd *command,
 270                 unsigned char *buf_recv, int data_len)
 271 {
 272         return __i2c_hid_command(client, command, 0, 0, NULL, 0,
 273                                 buf_recv, data_len);
 274 }
 275
 276 static int i2c_hid_get_report(struct i2c_client *client, u8 reportType,
 277                 u8 reportID, unsigned char *buf_recv, int data_len)
 278 {
 279         struct i2c_hid *ihid = i2c_get_clientdata(client);
 280         u8 args[3];
 281         int ret;
 282         int args_len = 0;
 283         u16 readRegister = le16_to_cpu(ihid->hdesc.wDataRegister);
 284
 285         i2c_hid_dbg(ihid, "%s\n", __func__);
 286
 287         if (reportID >= 0x0F) {
 288                 args[args_len++] = reportID;
 289                 reportID = 0x0F;
 290         }
 291
 292         args[args_len++] = readRegister & 0xFF;
 293         args[args_len++] = readRegister >> 8;
 294
 295         ret = __i2c_hid_command(client, &hid_get_report_cmd, reportID,
 296                 reportType, args, args_len, buf_recv, data_len);
 297         if (ret) {
 298                 dev_err(&client->dev,
 299                         "failed to retrieve report from device.\n");
 300                 return ret;
 301         }
 302
 303         return 0;
 304 }
 305
 306 /**
 307  * i2c_hid_set_or_send_report: forward an incoming report to the device
 308  * @client: the i2c_client of the device
 309  * @reportType: 0x03 for HID_FEATURE_REPORT ; 0x02 for HID_OUTPUT_REPORT
 310  * @reportID: the report ID
 311  * @buf: the actual data to transfer, without the report ID
 312  * @len: size of buf
 313  * @use_data: true: use SET_REPORT HID command, false: send plain OUTPUT report
 314  */
 315 static int i2c_hid_set_or_send_report(struct i2c_client *client, u8 reportType,
 316                 u8 reportID, unsigned char *buf, size_t data_len, bool use_data)
 317 {
 318         struct i2c_hid *ihid = i2c_get_clientdata(client);
 319         u8 *args = ihid->argsbuf;
 320         const struct i2c_hid_cmd *hidcmd;
 321         int ret;
 322         u16 dataRegister = le16_to_cpu(ihid->hdesc.wDataRegister);
 323         u16 outputRegister = le16_to_cpu(ihid->hdesc.wOutputRegister);
 324         u16 maxOutputLength = le16_to_cpu(ihid->hdesc.wMaxOutputLength);
 325         u16 size;
 326         int args_len;
 327         int index = 0;
 328
 329         i2c_hid_dbg(ihid, "%s\n", __func__);
 330
 331         if (data_len > ihid->bufsize)
 332                 return -EINVAL;
 333
 334         size =          2                       /* size */ +
 335                         (reportID ? 1 : 0)      /* reportID */ +
 336                         data_len                /* buf */;
 337         args_len =      (reportID >= 0x0F ? 1 : 0) /* optional third byte */ +
 338                         2                       /* dataRegister */ +
 339                         size                    /* args */;
 340
 341         if (!use_data && maxOutputLength == 0)
 342                 return -ENOSYS;
 343
 344         if (reportID >= 0x0F) {
 345                 args[index++] = reportID;
 346                 reportID = 0x0F;
 347         }
 348
 349         /*
 350          * use the data register for feature reports or if the device does not
 351          * support the output register
 352          */
 353         if (use_data) {
 354                 args[index++] = dataRegister & 0xFF;
 355                 args[index++] = dataRegister >> 8;
 356                 hidcmd = &hid_set_report_cmd;
 357         } else {
 358                 args[index++] = outputRegister & 0xFF;
 359                 args[index++] = outputRegister >> 8;
 360                 hidcmd = &hid_no_cmd;
 361         }
 362
 363         args[index++] = size & 0xFF;
 364         args[index++] = size >> 8;
 365
 366         if (reportID)
 367                 args[index++] = reportID;
 368
 369         memcpy(&args[index], buf, data_len);
 370
 371         ret = __i2c_hid_command(client, hidcmd, reportID,
 372                 reportType, args, args_len, NULL, 0);
 373         if (ret) {
 374                 dev_err(&client->dev, "failed to set a report to device.\n");
 375                 return ret;
 376         }
 377
 378         return data_len;
 379 }
 380
 381 static int i2c_hid_set_power(struct i2c_client *client, int power_state)
 382 {
 383         struct i2c_hid *ihid = i2c_get_clientdata(client);
 384         int ret;
 385
 386         i2c_hid_dbg(ihid, "%s\n", __func__);
 387
 388         /*
 389          * Some devices require to send a command to wakeup before power on.
 390          * The call will get a return value (EREMOTEIO) but device will be
 391          * triggered and activated. After that, it goes like a normal device.
 392          */
 393         if (power_state == I2C_HID_PWR_ON &&
 394             ihid->quirks & I2C_HID_QUIRK_SET_PWR_WAKEUP_DEV) {
 395                 ret = i2c_hid_command(client, &hid_set_power_cmd, NULL, 0);
 396
 397                 /* Device was already activated */
 398                 if (!ret)
 399                         goto set_pwr_exit;
 400         }
 401
 402         ret = __i2c_hid_command(client, &hid_set_power_cmd, power_state,
 403                 0, NULL, 0, NULL, 0);
 404
 405         if (ret)
 406                 dev_err(&client->dev, "failed to change power setting.\n");
 407
 408 set_pwr_exit:
 409
 410         /*
 411          * The HID over I2C specification states that if a DEVICE needs time
 412          * after the PWR_ON request, it should utilise CLOCK stretching.
 413          * However, it has been observered that the Windows driver provides a
 414          * 1ms sleep between the PWR_ON and RESET requests.
 415          * According to Goodix Windows even waits 60 ms after (other?)
 416          * PWR_ON requests. Testing has confirmed that several devices
 417          * will not work properly without a delay after a PWR_ON request.
 418          */
 419         if (!ret && power_state == I2C_HID_PWR_ON)
 420                 msleep(60);
 421
 422         return ret;
 423 }
 424
 425 static int i2c_hid_hwreset(struct i2c_client *client)
 426 {
 427         struct i2c_hid *ihid = i2c_get_clientdata(client);
 428         int ret;
 429
 430         i2c_hid_dbg(ihid, "%s\n", __func__);
 431
 432         /*
 433          * This prevents sending feature reports while the device is
 434          * being reset. Otherwise we may lose the reset complete
 435          * interrupt.
 436          */
 437         mutex_lock(&ihid->reset_lock);
 438
 439         ret = i2c_hid_set_power(client, I2C_HID_PWR_ON);
 440         if (ret)
 441                 goto out_unlock;
 442
 443         i2c_hid_dbg(ihid, "resetting...\n");
 444
 445         ret = i2c_hid_command(client, &hid_reset_cmd, NULL, 0);
 446         if (ret) {
 447                 dev_err(&client->dev, "failed to reset device.\n");
 448                 i2c_hid_set_power(client, I2C_HID_PWR_SLEEP);
 449         }
 450
 451 out_unlock:
 452         mutex_unlock(&ihid->reset_lock);
 453         return ret;
 454 }
 455
 456 static void i2c_hid_get_input(struct i2c_hid *ihid)
 457 {
 458         int ret;
 459         u32 ret_size;
 460         int size = le16_to_cpu(ihid->hdesc.wMaxInputLength);
 461
 462         if (size > ihid->bufsize)
 463                 size = ihid->bufsize;
 464
 465         ret = i2c_master_recv(ihid->client, ihid->inbuf, size);
 466         if (ret != size) {
 467                 if (ret < 0)
 468                         return;
 469
 470                 dev_err(&ihid->client->dev, "%s: got %d data instead of %d\n",
 471                         __func__, ret, size);
 472                 return;
 473         }
 474
 475         ret_size = ihid->inbuf[0] | ihid->inbuf[1] << 8;
 476
 477         if (!ret_size) {
 478                 /* host or device initiated RESET completed */
 479                 if (test_and_clear_bit(I2C_HID_RESET_PENDING, &ihid->flags))
 480                         wake_up(&ihid->wait);
 481                 return;
 482         }
 483
 484         if ((ret_size > size) || (ret_size < 2)) {
 485                 dev_err(&ihid->client->dev, "%s: incomplete report (%d/%d)\n",
 486                         __func__, size, ret_size);
 487                 return;
 488         }
 489
 490         i2c_hid_dbg(ihid, "input: %*ph\n", ret_size, ihid->inbuf);
 491
 492         if (test_bit(I2C_HID_STARTED, &ihid->flags))
 493                 hid_input_report(ihid->hid, HID_INPUT_REPORT, ihid->inbuf + 2,
 494                                 ret_size - 2, 1);
 495
 496         return;
 497 }
 498
 499 static irqreturn_t i2c_hid_irq(int irq, void *dev_id)
 500 {
 501         struct i2c_hid *ihid = dev_id;
 502
 503         if (test_bit(I2C_HID_READ_PENDING, &ihid->flags))
 504                 return IRQ_HANDLED;
 505
 506         i2c_hid_get_input(ihid);
 507
 508         return IRQ_HANDLED;
 509 }
 510
 511 static int i2c_hid_get_report_length(struct hid_report *report)
 512 {
 513         return ((report->size - 1) >> 3) + 1 +
 514                 report->device->report_enum[report->type].numbered + 2;
 515 }
 516
 517 /*
 518  * Traverse the supplied list of reports and find the longest
 519  */
 520 static void i2c_hid_find_max_report(struct hid_device *hid, unsigned int type,
 521                 unsigned int *max)
 522 {
 523         struct hid_report *report;
 524         unsigned int size;
 525
 526         /* We should not rely on wMaxInputLength, as some devices may set it to
 527          * a wrong length. */
 528         list_for_each_entry(report, &hid->report_enum[type].report_list, list) {
 529                 size = i2c_hid_get_report_length(report);
 530                 if (*max < size)
 531                         *max = size;
 532         }
 533 }
 534
 535 static void i2c_hid_free_buffers(struct i2c_hid *ihid)
 536 {
 537         kfree(ihid->inbuf);
 538         kfree(ihid->rawbuf);
 539         kfree(ihid->argsbuf);
 540         kfree(ihid->cmdbuf);
 541         ihid->inbuf = NULL;
 542         ihid->rawbuf = NULL;
 543         ihid->cmdbuf = NULL;
 544         ihid->argsbuf = NULL;
 545         ihid->bufsize = 0;
 546 }
 547
 548 static int i2c_hid_alloc_buffers(struct i2c_hid *ihid, size_t report_size)
 549 {
 550         /* the worst case is computed from the set_report command with a
 551          * reportID > 15 and the maximum report length */
 552         int args_len = sizeof(__u8) + /* ReportID */
 553                        sizeof(__u8) + /* optional ReportID byte */
 554                        sizeof(__u16) + /* data register */
 555                        sizeof(__u16) + /* size of the report */
 556                        report_size; /* report */
 557
 558         ihid->inbuf = kzalloc(report_size, GFP_KERNEL);
 559         ihid->rawbuf = kzalloc(report_size, GFP_KERNEL);
 560         ihid->argsbuf = kzalloc(args_len, GFP_KERNEL);
 561         ihid->cmdbuf = kzalloc(sizeof(union command) + args_len, GFP_KERNEL);
 562
 563         if (!ihid->inbuf || !ihid->rawbuf || !ihid->argsbuf || !ihid->cmdbuf) {
 564                 i2c_hid_free_buffers(ihid);
 565                 return -ENOMEM;
 566         }
 567
 568         ihid->bufsize = report_size;
 569
 570         return 0;
 571 }
 572
 573 static int i2c_hid_get_raw_report(struct hid_device *hid,
 574                 unsigned char report_number, __u8 *buf, size_t count,
 575                 unsigned char report_type)
 576 {
 577         struct i2c_client *client = hid->driver_data;
 578         struct i2c_hid *ihid = i2c_get_clientdata(client);
 579         size_t ret_count, ask_count;
 580         int ret;
 581
 582         if (report_type == HID_OUTPUT_REPORT)
 583                 return -EINVAL;
 584
 585         /* +2 bytes to include the size of the reply in the query buffer */
 586         ask_count = min(count + 2, (size_t)ihid->bufsize);
 587
 588         ret = i2c_hid_get_report(client,
 589                         report_type == HID_FEATURE_REPORT ? 0x03 : 0x01,
 590                         report_number, ihid->rawbuf, ask_count);
 591
 592         if (ret < 0)
 593                 return ret;
 594
 595         ret_count = ihid->rawbuf[0] | (ihid->rawbuf[1] << 8);
 596
 597         if (ret_count <= 2)
 598                 return 0;
 599
 600         ret_count = min(ret_count, ask_count);
 601
 602         /* The query buffer contains the size, dropping it in the reply */
 603         count = min(count, ret_count - 2);
 604         memcpy(buf, ihid->rawbuf + 2, count);
 605
 606         return count;
 607 }
 608
 609 static int i2c_hid_output_raw_report(struct hid_device *hid, __u8 *buf,
 610                 size_t count, unsigned char report_type, bool use_data)
 611 {
 612         struct i2c_client *client = hid->driver_data;
 613         struct i2c_hid *ihid = i2c_get_clientdata(client);
 614         int report_id = buf[0];
 615         int ret;
 616
 617         if (report_type == HID_INPUT_REPORT)
 618                 return -EINVAL;
 619
 620         mutex_lock(&ihid->reset_lock);
 621
 622         if (report_id) {
 623                 buf++;
 624                 count--;
 625         }
 626
 627         ret = i2c_hid_set_or_send_report(client,
 628                                 report_type == HID_FEATURE_REPORT ? 0x03 : 0x02,
 629                                 report_id, buf, count, use_data);
 630
 631         if (report_id && ret >= 0)
 632                 ret++; /* add report_id to the number of transfered bytes */
 633
 634         mutex_unlock(&ihid->reset_lock);
 635
 636         return ret;
 637 }
 638
 639 static int i2c_hid_output_report(struct hid_device *hid, __u8 *buf,
 640                 size_t count)
 641 {
 642         return i2c_hid_output_raw_report(hid, buf, count, HID_OUTPUT_REPORT,
 643                         false);
 644 }
 645
 646 static int i2c_hid_raw_request(struct hid_device *hid, unsigned char reportnum,
 647                                __u8 *buf, size_t len, unsigned char rtype,
 648                                int reqtype)
 649 {
 650         switch (reqtype) {
 651         case HID_REQ_GET_REPORT:
 652                 return i2c_hid_get_raw_report(hid, reportnum, buf, len, rtype);
 653         case HID_REQ_SET_REPORT:
 654                 if (buf[0] != reportnum)
 655                         return -EINVAL;
 656                 return i2c_hid_output_raw_report(hid, buf, len, rtype, true);
 657         default:
 658                 return -EIO;
 659         }
 660 }
 661
 662 static int i2c_hid_parse(struct hid_device *hid)
 663 {
 664         struct i2c_client *client = hid->driver_data;
 665         struct i2c_hid *ihid = i2c_get_clientdata(client);
 666         struct i2c_hid_desc *hdesc = &ihid->hdesc;
 667         unsigned int rsize;
 668         char *rdesc;
 669         int ret;
 670         int tries = 3;
 671         char *use_override;
 672
 673         i2c_hid_dbg(ihid, "entering %s\n", __func__);
 674
 675         rsize = le16_to_cpu(hdesc->wReportDescLength);
 676         if (!rsize || rsize > HID_MAX_DESCRIPTOR_SIZE) {
 677                 dbg_hid("weird size of report descriptor (%u)\n", rsize);
 678                 return -EINVAL;
 679         }
 680
 681         do {
 682                 ret = i2c_hid_hwreset(client);
 683                 if (ret)
 684                         msleep(1000);
 685         } while (tries-- > 0 && ret);
 686
 687         if (ret)
 688                 return ret;
 689
 690         use_override = i2c_hid_get_dmi_hid_report_desc_override(client->name,
 691                                                                 &rsize);
 692
 693         if (use_override) {
 694                 rdesc = use_override;
 695                 i2c_hid_dbg(ihid, "Using a HID report descriptor override\n");
 696         } else {
 697                 rdesc = kzalloc(rsize, GFP_KERNEL);
 698
 699                 if (!rdesc) {
 700                         dbg_hid("couldn't allocate rdesc memory\n");
 701                         return -ENOMEM;
 702                 }
 703
 704                 i2c_hid_dbg(ihid, "asking HID report descriptor\n");
 705
 706                 ret = i2c_hid_command(client, &hid_report_descr_cmd,
 707                                       rdesc, rsize);
 708                 if (ret) {
 709                         hid_err(hid, "reading report descriptor failed\n");
 710                         kfree(rdesc);
 711                         return -EIO;
 712                 }
 713         }
 714
 715         i2c_hid_dbg(ihid, "Report Descriptor: %*ph\n", rsize, rdesc);
 716
 717         ret = hid_parse_report(hid, rdesc, rsize);
 718         if (!use_override)
 719                 kfree(rdesc);
 720
 721         if (ret) {
 722                 dbg_hid("parsing report descriptor failed\n");
 723                 return ret;
 724         }
 725
 726         return 0;
 727 }
 728
 729 static int i2c_hid_start(struct hid_device *hid)
 730 {
 731         struct i2c_client *client = hid->driver_data;
 732         struct i2c_hid *ihid = i2c_get_clientdata(client);
 733         int ret;
 734         unsigned int bufsize = HID_MIN_BUFFER_SIZE;
 735
 736         i2c_hid_find_max_report(hid, HID_INPUT_REPORT, &bufsize);
 737         i2c_hid_find_max_report(hid, HID_OUTPUT_REPORT, &bufsize);
 738         i2c_hid_find_max_report(hid, HID_FEATURE_REPORT, &bufsize);
 739
 740         if (bufsize > ihid->bufsize) {
 741                 disable_irq(client->irq);
 742                 i2c_hid_free_buffers(ihid);
 743
 744                 ret = i2c_hid_alloc_buffers(ihid, bufsize);
 745                 enable_irq(client->irq);
 746
 747                 if (ret)
 748                         return ret;
 749         }
 750
 751         return 0;
 752 }
 753
 754 static void i2c_hid_stop(struct hid_device *hid)
 755 {
 756         hid->claimed = 0;
 757 }
 758
 759 static int i2c_hid_open(struct hid_device *hid)
 760 {
 761         struct i2c_client *client = hid->driver_data;
 762         struct i2c_hid *ihid = i2c_get_clientdata(client);
 763         int ret = 0;
 764
 765         ret = pm_runtime_get_sync(&client->dev);
 766         if (ret < 0)
 767                 return ret;
 768
 769         set_bit(I2C_HID_STARTED, &ihid->flags);
 770         return 0;
 771 }
 772
 773 static void i2c_hid_close(struct hid_device *hid)
 774 {
 775         struct i2c_client *client = hid->driver_data;
 776         struct i2c_hid *ihid = i2c_get_clientdata(client);
 777
 778         clear_bit(I2C_HID_STARTED, &ihid->flags);
 779
 780         /* Save some power */
 781         pm_runtime_put(&client->dev);
 782 }
 783
 784 static int i2c_hid_power(struct hid_device *hid, int lvl)
 785 {
 786         struct i2c_client *client = hid->driver_data;
 787         struct i2c_hid *ihid = i2c_get_clientdata(client);
 788
 789         i2c_hid_dbg(ihid, "%s lvl:%d\n", __func__, lvl);
 790
 791         switch (lvl) {
 792         case PM_HINT_FULLON:
 793                 pm_runtime_get_sync(&client->dev);
 794                 break;
 795         case PM_HINT_NORMAL:
 796                 pm_runtime_put(&client->dev);
 797                 break;
 798         }
 799         return 0;
 800 }
 801
 802 struct hid_ll_driver i2c_hid_ll_driver = {
 803         .parse = i2c_hid_parse,
 804         .start = i2c_hid_start,
 805         .stop = i2c_hid_stop,
 806         .open = i2c_hid_open,
 807         .close = i2c_hid_close,
 808         .power = i2c_hid_power,
 809         .output_report = i2c_hid_output_report,
 810         .raw_request = i2c_hid_raw_request,
 811 };
 812 EXPORT_SYMBOL_GPL(i2c_hid_ll_driver);
 813
 814 static int i2c_hid_init_irq(struct i2c_client *client)
 815 {
 816         struct i2c_hid *ihid = i2c_get_clientdata(client);
 817         unsigned long irqflags = 0;
 818         int ret;
 819
 820         dev_dbg(&client->dev, "Requesting IRQ: %d\n", client->irq);
 821
 822         if (!irq_get_trigger_type(client->irq))
 823                 irqflags = IRQF_TRIGGER_LOW;
 824
 825         ret = request_threaded_irq(client->irq, NULL, i2c_hid_irq,
 826                                    irqflags | IRQF_ONESHOT, client->name, ihid);
 827         if (ret < 0) {
 828                 dev_warn(&client->dev,
 829                         "Could not register for %s interrupt, irq = %d,"
 830                         " ret = %d\n",
 831                         client->name, client->irq, ret);
 832
 833                 return ret;
 834         }
 835
 836         return 0;
 837 }
 838
 839 static int i2c_hid_fetch_hid_descriptor(struct i2c_hid *ihid)
 840 {
 841         struct i2c_client *client = ihid->client;
 842         struct i2c_hid_desc *hdesc = &ihid->hdesc;
 843         unsigned int dsize;
 844         int ret;
 845
 846         /* i2c hid fetch using a fixed descriptor size (30 bytes) */
 847         if (i2c_hid_get_dmi_i2c_hid_desc_override(client->name)) {
 848                 i2c_hid_dbg(ihid, "Using a HID descriptor override\n");
 849                 ihid->hdesc =
 850                         *i2c_hid_get_dmi_i2c_hid_desc_override(client->name);
 851         } else {
 852                 i2c_hid_dbg(ihid, "Fetching the HID descriptor\n");
 853                 ret = i2c_hid_command(client, &hid_descr_cmd,
 854                                       ihid->hdesc_buffer,
 855                                       sizeof(struct i2c_hid_desc));
 856                 if (ret) {
 857                         dev_err(&client->dev, "hid_descr_cmd failed\n");
 858                         return -ENODEV;
 859                 }
 860         }
 861
 862         /* Validate the length of HID descriptor, the 4 first bytes:
 863          * bytes 0-1 -> length
 864          * bytes 2-3 -> bcdVersion (has to be 1.00) */
 865         /* check bcdVersion == 1.0 */
 866         if (le16_to_cpu(hdesc->bcdVersion) != 0x0100) {
 867                 dev_err(&client->dev,
 868                         "unexpected HID descriptor bcdVersion (0x%04hx)\n",
 869                         le16_to_cpu(hdesc->bcdVersion));
 870                 return -ENODEV;
 871         }
 872
 873         /* Descriptor length should be 30 bytes as per the specification */
 874         dsize = le16_to_cpu(hdesc->wHIDDescLength);
 875         if (dsize != sizeof(struct i2c_hid_desc)) {
 876                 dev_err(&client->dev, "weird size of HID descriptor (%u)\n",
 877                         dsize);
 878                 return -ENODEV;
 879         }
 880         i2c_hid_dbg(ihid, "HID Descriptor: %*ph\n", dsize, ihid->hdesc_buffer);
 881         return 0;
 882 }
 883
 884 #ifdef CONFIG_ACPI
 885 static int i2c_hid_acpi_pdata(struct i2c_client *client,
 886                 struct i2c_hid_platform_data *pdata)
 887 {
 888         static guid_t i2c_hid_guid =
 889                 GUID_INIT(0x3CDFF6F7, 0x4267, 0x4555,
 890                           0xAD, 0x05, 0xB3, 0x0A, 0x3D, 0x89, 0x38, 0xDE);
 891         union acpi_object *obj;
 892         struct acpi_device *adev;
 893         acpi_handle handle;
 894
 895         handle = ACPI_HANDLE(&client->dev);
 896         if (!handle || acpi_bus_get_device(handle, &adev))
 897                 return -ENODEV;
 898
 899         obj = acpi_evaluate_dsm_typed(handle, &i2c_hid_guid, 1, 1, NULL,
 900                                       ACPI_TYPE_INTEGER);
 901         if (!obj) {
 902                 dev_err(&client->dev, "device _DSM execution failed\n");
 903                 return -ENODEV;
 904         }
 905
 906         pdata->hid_descriptor_address = obj->integer.value;
 907         ACPI_FREE(obj);
 908
 909         return 0;
 910 }
 911
 912 static void i2c_hid_acpi_fix_up_power(struct device *dev)
 913 {
 914         acpi_handle handle = ACPI_HANDLE(dev);
 915         struct acpi_device *adev;
 916
 917         if (handle && acpi_bus_get_device(handle, &adev) == 0)
 918                 acpi_device_fix_up_power(adev);
 919 }
 920
 921 static const struct acpi_device_id i2c_hid_acpi_match[] = {
 922         {"ACPI0C50", 0 },
 923         {"PNP0C50", 0 },
 924         { },
 925 };
 926 MODULE_DEVICE_TABLE(acpi, i2c_hid_acpi_match);
 927 #else
 928 static inline int i2c_hid_acpi_pdata(struct i2c_client *client,
 929                 struct i2c_hid_platform_data *pdata)
 930 {
 931         return -ENODEV;
 932 }
 933
 934 static inline void i2c_hid_acpi_fix_up_power(struct device *dev) {}
 935 #endif
 936
 937 #ifdef CONFIG_OF
 938 static int i2c_hid_of_probe(struct i2c_client *client,
 939                 struct i2c_hid_platform_data *pdata)
 940 {
 941         struct device *dev = &client->dev;
 942         u32 val;
 943         int ret;
 944
 945         ret = of_property_read_u32(dev->of_node, "hid-descr-addr", &val);
 946         if (ret) {
 947                 dev_err(&client->dev, "HID register address not provided\n");
 948                 return -ENODEV;
 949         }
 950         if (val >> 16) {
 951                 dev_err(&client->dev, "Bad HID register address: 0x%08x\n",
 952                         val);
 953                 return -EINVAL;
 954         }
 955         pdata->hid_descriptor_address = val;
 956
 957         ret = of_property_read_u32(dev->of_node, "post-power-on-delay-ms",
 958                                    &val);
 959         if (!ret)
 960                 pdata->post_power_delay_ms = val;
 961
 962         return 0;
 963 }
 964
 965 static const struct of_device_id i2c_hid_of_match[] = {
 966         { .compatible = "hid-over-i2c" },
 967         {},
 968 };
 969 MODULE_DEVICE_TABLE(of, i2c_hid_of_match);
 970 #else
 971 static inline int i2c_hid_of_probe(struct i2c_client *client,
 972                 struct i2c_hid_platform_data *pdata)
 973 {
 974         return -ENODEV;
 975 }
 976 #endif
 977
 978 static int i2c_hid_probe(struct i2c_client *client,
 979                          const struct i2c_device_id *dev_id)
 980 {
 981         int ret;
 982         struct i2c_hid *ihid;
 983         struct hid_device *hid;
 984         __u16 hidRegister;
 985         struct i2c_hid_platform_data *platform_data = client->dev.platform_data;
 986
 987         dbg_hid("HID probe called for i2c 0x%02x\n", client->addr);
 988
 989         if (!client->irq) {
 990                 dev_err(&client->dev,
 991                         "HID over i2c has not been provided an Int IRQ\n");
 992                 return -EINVAL;
 993         }
 994
 995         if (client->irq < 0) {
 996                 if (client->irq != -EPROBE_DEFER)
 997                         dev_err(&client->dev,
 998                                 "HID over i2c doesn't have a valid IRQ\n");
 999                 return client->irq;
1000         }
1001
1002         ihid = kzalloc(sizeof(struct i2c_hid), GFP_KERNEL);
1003         if (!ihid)
1004                 return -ENOMEM;
1005
1006         if (client->dev.of_node) {
1007                 ret = i2c_hid_of_probe(client, &ihid->pdata);
1008                 if (ret)
1009                         goto err;
1010         } else if (!platform_data) {
1011                 ret = i2c_hid_acpi_pdata(client, &ihid->pdata);
1012                 if (ret) {
1013                         dev_err(&client->dev,
1014                                 "HID register address not provided\n");
1015                         goto err;
1016                 }
1017         } else {
1018                 ihid->pdata = *platform_data;
1019         }
1020
1021         ihid->pdata.supply = devm_regulator_get(&client->dev, "vdd");
1022         if (IS_ERR(ihid->pdata.supply)) {
1023                 ret = PTR_ERR(ihid->pdata.supply);
1024                 if (ret != -EPROBE_DEFER)
1025                         dev_err(&client->dev, "Failed to get regulator: %d\n",
1026                                 ret);
1027                 goto err;
1028         }
1029
1030         ret = regulator_enable(ihid->pdata.supply);
1031         if (ret < 0) {
1032                 dev_err(&client->dev, "Failed to enable regulator: %d\n",
1033                         ret);
1034                 goto err;
1035         }
1036         if (ihid->pdata.post_power_delay_ms)
1037                 msleep(ihid->pdata.post_power_delay_ms);
1038
1039         i2c_set_clientdata(client, ihid);
1040
1041         ihid->client = client;
1042
1043         hidRegister = ihid->pdata.hid_descriptor_address;
1044         ihid->wHIDDescRegister = cpu_to_le16(hidRegister);
1045
1046         init_waitqueue_head(&ihid->wait);
1047         mutex_init(&ihid->reset_lock);
1048
1049         /* we need to allocate the command buffer without knowing the maximum
1050          * size of the reports. Let's use HID_MIN_BUFFER_SIZE, then we do the
1051          * real computation later. */
1052         ret = i2c_hid_alloc_buffers(ihid, HID_MIN_BUFFER_SIZE);
1053         if (ret < 0)
1054                 goto err_regulator;
1055
1056         i2c_hid_acpi_fix_up_power(&client->dev);
1057
1058         pm_runtime_get_noresume(&client->dev);
1059         pm_runtime_set_active(&client->dev);
1060         pm_runtime_enable(&client->dev);
1061         device_enable_async_suspend(&client->dev);
1062
1063         /* Make sure there is something at this address */
1064         ret = i2c_smbus_read_byte(client);
1065         if (ret < 0) {
1066                 dev_dbg(&client->dev, "nothing at this address: %d\n", ret);
1067                 ret = -ENXIO;
1068                 goto err_pm;
1069         }
1070
1071         ret = i2c_hid_fetch_hid_descriptor(ihid);
1072         if (ret < 0)
1073                 goto err_pm;
1074
1075         ret = i2c_hid_init_irq(client);
1076         if (ret < 0)
1077                 goto err_pm;
1078
1079         hid = hid_allocate_device();
1080         if (IS_ERR(hid)) {
1081                 ret = PTR_ERR(hid);
1082                 goto err_irq;
1083         }
1084
1085         ihid->hid = hid;
1086
1087         hid->driver_data = client;
1088         hid->ll_driver = &i2c_hid_ll_driver;
1089         hid->dev.parent = &client->dev;
1090         hid->bus = BUS_I2C;
1091         hid->version = le16_to_cpu(ihid->hdesc.bcdVersion);
1092         hid->vendor = le16_to_cpu(ihid->hdesc.wVendorID);
1093         hid->product = le16_to_cpu(ihid->hdesc.wProductID);
1094
1095         snprintf(hid->name, sizeof(hid->name), "%s %04X:%04X",
1096                  client->name, (u16)hid->vendor, (u16)hid->product);
1097         strlcpy(hid->phys, dev_name(&client->dev), sizeof(hid->phys));
1098
1099         ihid->quirks = i2c_hid_lookup_quirk(hid->vendor, hid->product);
1100
1101         ret = hid_add_device(hid);
1102         if (ret) {
1103                 if (ret != -ENODEV)
1104                         hid_err(client, "can't add hid device: %d\n", ret);
1105                 goto err_mem_free;
1106         }
1107
1108         pm_runtime_put(&client->dev);
1109         return 0;
1110
1111 err_mem_free:
1112         hid_destroy_device(hid);
1113
1114 err_irq:
1115         free_irq(client->irq, ihid);
1116
1117 err_pm:
1118         pm_runtime_put_noidle(&client->dev);
1119         pm_runtime_disable(&client->dev);
1120
1121 err_regulator:
1122         regulator_disable(ihid->pdata.supply);
1123
1124 err:
1125         i2c_hid_free_buffers(ihid);
1126         kfree(ihid);
1127         return ret;
1128 }
1129
1130 static int i2c_hid_remove(struct i2c_client *client)
1131 {
1132         struct i2c_hid *ihid = i2c_get_clientdata(client);
1133         struct hid_device *hid;
1134
1135         pm_runtime_get_sync(&client->dev);
1136         pm_runtime_disable(&client->dev);
1137         pm_runtime_set_suspended(&client->dev);
1138         pm_runtime_put_noidle(&client->dev);
1139
1140         hid = ihid->hid;
1141         hid_destroy_device(hid);
1142
1143         free_irq(client->irq, ihid);
1144
1145         if (ihid->bufsize)
1146                 i2c_hid_free_buffers(ihid);
1147
1148         regulator_disable(ihid->pdata.supply);
1149
1150         kfree(ihid);
1151
1152         return 0;
1153 }
1154
1155 static void i2c_hid_shutdown(struct i2c_client *client)
1156 {
1157         struct i2c_hid *ihid = i2c_get_clientdata(client);
1158
1159         i2c_hid_set_power(client, I2C_HID_PWR_SLEEP);
1160         free_irq(client->irq, ihid);
1161 }
1162
1163 #ifdef CONFIG_PM_SLEEP
1164 static int i2c_hid_suspend(struct device *dev)
1165 {
1166         struct i2c_client *client = to_i2c_client(dev);
1167         struct i2c_hid *ihid = i2c_get_clientdata(client);
1168         struct hid_device *hid = ihid->hid;
1169         int ret;
1170         int wake_status;
1171
1172         if (hid->driver && hid->driver->suspend) {
1173                 /*
1174                  * Wake up the device so that IO issues in
1175                  * HID driver's suspend code can succeed.
1176                  */
1177                 ret = pm_runtime_resume(dev);
1178                 if (ret < 0)
1179                         return ret;
1180
1181                 ret = hid->driver->suspend(hid, PMSG_SUSPEND);
1182                 if (ret < 0)
1183                         return ret;
1184         }
1185
1186         if (!pm_runtime_suspended(dev)) {
1187                 /* Save some power */
1188                 i2c_hid_set_power(client, I2C_HID_PWR_SLEEP);
1189
1190                 disable_irq(client->irq);
1191         }
1192
1193         if (device_may_wakeup(&client->dev)) {
1194                 wake_status = enable_irq_wake(client->irq);
1195                 if (!wake_status)
1196                         ihid->irq_wake_enabled = true;
1197                 else
1198                         hid_warn(hid, "Failed to enable irq wake: %d\n",
1199                                 wake_status);
1200         } else {
1201                 ret = regulator_disable(ihid->pdata.supply);
1202                 if (ret < 0)
1203                         hid_warn(hid, "Failed to disable supply: %d\n", ret);
1204         }
1205
1206         return 0;
1207 }
1208
1209 static int i2c_hid_resume(struct device *dev)
1210 {
1211         int ret;
1212         struct i2c_client *client = to_i2c_client(dev);
1213         struct i2c_hid *ihid = i2c_get_clientdata(client);
1214         struct hid_device *hid = ihid->hid;
1215         int wake_status;
1216
1217         if (!device_may_wakeup(&client->dev)) {
1218                 ret = regulator_enable(ihid->pdata.supply);
1219                 if (ret < 0)
1220                         hid_warn(hid, "Failed to enable supply: %d\n", ret);
1221                 if (ihid->pdata.post_power_delay_ms)
1222                         msleep(ihid->pdata.post_power_delay_ms);
1223         } else if (ihid->irq_wake_enabled) {
1224                 wake_status = disable_irq_wake(client->irq);
1225                 if (!wake_status)
1226                         ihid->irq_wake_enabled = false;
1227                 else
1228                         hid_warn(hid, "Failed to disable irq wake: %d\n",
1229                                 wake_status);
1230         }
1231
1232         /* We'll resume to full power */
1233         pm_runtime_disable(dev);
1234         pm_runtime_set_active(dev);
1235         pm_runtime_enable(dev);
1236
1237         enable_irq(client->irq);
1238         ret = i2c_hid_hwreset(client);
1239         if (ret)
1240                 return ret;
1241
1242         if (hid->driver && hid->driver->reset_resume) {
1243                 ret = hid->driver->reset_resume(hid);
1244                 return ret;
1245         }
1246
1247         return 0;
1248 }
1249 #endif
1250
1251 #ifdef CONFIG_PM
1252 static int i2c_hid_runtime_suspend(struct device *dev)
1253 {
1254         struct i2c_client *client = to_i2c_client(dev);
1255
1256         i2c_hid_set_power(client, I2C_HID_PWR_SLEEP);
1257         disable_irq(client->irq);
1258         return 0;
1259 }
1260
1261 static int i2c_hid_runtime_resume(struct device *dev)
1262 {
1263         struct i2c_client *client = to_i2c_client(dev);
1264
1265         enable_irq(client->irq);
1266         i2c_hid_set_power(client, I2C_HID_PWR_ON);
1267         return 0;
1268 }
1269 #endif
1270
1271 static const struct dev_pm_ops i2c_hid_pm = {
1272         SET_SYSTEM_SLEEP_PM_OPS(i2c_hid_suspend, i2c_hid_resume)
1273         SET_RUNTIME_PM_OPS(i2c_hid_runtime_suspend, i2c_hid_runtime_resume,
1274                            NULL)
1275 };
1276
1277 static const struct i2c_device_id i2c_hid_id_table[] = {
1278         { "hid", 0 },
1279         { "hid-over-i2c", 0 },
1280         { },
1281 };
1282 MODULE_DEVICE_TABLE(i2c, i2c_hid_id_table);
1283
1284
1285 static struct i2c_driver i2c_hid_driver = {
1286         .driver = {
1287                 .name   = "i2c_hid",
1288                 .pm     = &i2c_hid_pm,
1289                 .acpi_match_table = ACPI_PTR(i2c_hid_acpi_match),
1290                 .of_match_table = of_match_ptr(i2c_hid_of_match),
1291         },
1292
1293         .probe          = i2c_hid_probe,
1294         .remove         = i2c_hid_remove,
1295         .shutdown       = i2c_hid_shutdown,
1296         .id_table       = i2c_hid_id_table,
1297 };
1298
1299 module_i2c_driver(i2c_hid_driver);
1300
1301 MODULE_DESCRIPTION("HID over I2C core driver");
1302 MODULE_AUTHOR("Benjamin Tissoires <benjamin.tissoires@gmail.com>");
1303 MODULE_LICENSE("GPL");