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         /*
 586          * In case of unnumbered reports the response from the device will
 587          * not have the report ID that the upper layers expect, so we need
 588          * to stash it the buffer ourselves and adjust the data size.
 589          */
 590         if (!report_number) {
 591                 buf[0] = 0;
 592                 buf++;
 593                 count--;
 594         }
 595
 596         /* +2 bytes to include the size of the reply in the query buffer */
 597         ask_count = min(count + 2, (size_t)ihid->bufsize);
 598
 599         ret = i2c_hid_get_report(client,
 600                         report_type == HID_FEATURE_REPORT ? 0x03 : 0x01,
 601                         report_number, ihid->rawbuf, ask_count);
 602
 603         if (ret < 0)
 604                 return ret;
 605
 606         ret_count = ihid->rawbuf[0] | (ihid->rawbuf[1] << 8);
 607
 608         if (ret_count <= 2)
 609                 return 0;
 610
 611         ret_count = min(ret_count, ask_count);
 612
 613         /* The query buffer contains the size, dropping it in the reply */
 614         count = min(count, ret_count - 2);
 615         memcpy(buf, ihid->rawbuf + 2, count);
 616
 617         if (!report_number)
 618                 count++;
 619
 620         return count;
 621 }
 622
 623 static int i2c_hid_output_raw_report(struct hid_device *hid, __u8 *buf,
 624                 size_t count, unsigned char report_type, bool use_data)
 625 {
 626         struct i2c_client *client = hid->driver_data;
 627         struct i2c_hid *ihid = i2c_get_clientdata(client);
 628         int report_id = buf[0];
 629         int ret;
 630
 631         if (report_type == HID_INPUT_REPORT)
 632                 return -EINVAL;
 633
 634         mutex_lock(&ihid->reset_lock);
 635
 636         /*
 637          * Note that both numbered and unnumbered reports passed here
 638          * are supposed to have report ID stored in the 1st byte of the
 639          * buffer, so we strip it off unconditionally before passing payload
 640          * to i2c_hid_set_or_send_report which takes care of encoding
 641          * everything properly.
 642          */
 643         ret = i2c_hid_set_or_send_report(client,
 644                                 report_type == HID_FEATURE_REPORT ? 0x03 : 0x02,
 645                                 report_id, buf + 1, count - 1, use_data);
 646
 647         if (ret >= 0)
 648                 ret++; /* add report_id to the number of transferred bytes */
 649
 650         mutex_unlock(&ihid->reset_lock);
 651
 652         return ret;
 653 }
 654
 655 static int i2c_hid_output_report(struct hid_device *hid, __u8 *buf,
 656                 size_t count)
 657 {
 658         return i2c_hid_output_raw_report(hid, buf, count, HID_OUTPUT_REPORT,
 659                         false);
 660 }
 661
 662 static int i2c_hid_raw_request(struct hid_device *hid, unsigned char reportnum,
 663                                __u8 *buf, size_t len, unsigned char rtype,
 664                                int reqtype)
 665 {
 666         switch (reqtype) {
 667         case HID_REQ_GET_REPORT:
 668                 return i2c_hid_get_raw_report(hid, reportnum, buf, len, rtype);
 669         case HID_REQ_SET_REPORT:
 670                 if (buf[0] != reportnum)
 671                         return -EINVAL;
 672                 return i2c_hid_output_raw_report(hid, buf, len, rtype, true);
 673         default:
 674                 return -EIO;
 675         }
 676 }
 677
 678 static int i2c_hid_parse(struct hid_device *hid)
 679 {
 680         struct i2c_client *client = hid->driver_data;
 681         struct i2c_hid *ihid = i2c_get_clientdata(client);
 682         struct i2c_hid_desc *hdesc = &ihid->hdesc;
 683         unsigned int rsize;
 684         char *rdesc;
 685         int ret;
 686         int tries = 3;
 687         char *use_override;
 688
 689         i2c_hid_dbg(ihid, "entering %s\n", __func__);
 690
 691         rsize = le16_to_cpu(hdesc->wReportDescLength);
 692         if (!rsize || rsize > HID_MAX_DESCRIPTOR_SIZE) {
 693                 dbg_hid("weird size of report descriptor (%u)\n", rsize);
 694                 return -EINVAL;
 695         }
 696
 697         do {
 698                 ret = i2c_hid_hwreset(client);
 699                 if (ret)
 700                         msleep(1000);
 701         } while (tries-- > 0 && ret);
 702
 703         if (ret)
 704                 return ret;
 705
 706         use_override = i2c_hid_get_dmi_hid_report_desc_override(client->name,
 707                                                                 &rsize);
 708
 709         if (use_override) {
 710                 rdesc = use_override;
 711                 i2c_hid_dbg(ihid, "Using a HID report descriptor override\n");
 712         } else {
 713                 rdesc = kzalloc(rsize, GFP_KERNEL);
 714
 715                 if (!rdesc) {
 716                         dbg_hid("couldn't allocate rdesc memory\n");
 717                         return -ENOMEM;
 718                 }
 719
 720                 i2c_hid_dbg(ihid, "asking HID report descriptor\n");
 721
 722                 ret = i2c_hid_command(client, &hid_report_descr_cmd,
 723                                       rdesc, rsize);
 724                 if (ret) {
 725                         hid_err(hid, "reading report descriptor failed\n");
 726                         kfree(rdesc);
 727                         return -EIO;
 728                 }
 729         }
 730
 731         i2c_hid_dbg(ihid, "Report Descriptor: %*ph\n", rsize, rdesc);
 732
 733         ret = hid_parse_report(hid, rdesc, rsize);
 734         if (!use_override)
 735                 kfree(rdesc);
 736
 737         if (ret) {
 738                 dbg_hid("parsing report descriptor failed\n");
 739                 return ret;
 740         }
 741
 742         return 0;
 743 }
 744
 745 static int i2c_hid_start(struct hid_device *hid)
 746 {
 747         struct i2c_client *client = hid->driver_data;
 748         struct i2c_hid *ihid = i2c_get_clientdata(client);
 749         int ret;
 750         unsigned int bufsize = HID_MIN_BUFFER_SIZE;
 751
 752         i2c_hid_find_max_report(hid, HID_INPUT_REPORT, &bufsize);
 753         i2c_hid_find_max_report(hid, HID_OUTPUT_REPORT, &bufsize);
 754         i2c_hid_find_max_report(hid, HID_FEATURE_REPORT, &bufsize);
 755
 756         if (bufsize > ihid->bufsize) {
 757                 disable_irq(client->irq);
 758                 i2c_hid_free_buffers(ihid);
 759
 760                 ret = i2c_hid_alloc_buffers(ihid, bufsize);
 761                 enable_irq(client->irq);
 762
 763                 if (ret)
 764                         return ret;
 765         }
 766
 767         return 0;
 768 }
 769
 770 static void i2c_hid_stop(struct hid_device *hid)
 771 {
 772         hid->claimed = 0;
 773 }
 774
 775 static int i2c_hid_open(struct hid_device *hid)
 776 {
 777         struct i2c_client *client = hid->driver_data;
 778         struct i2c_hid *ihid = i2c_get_clientdata(client);
 779         int ret = 0;
 780
 781         ret = pm_runtime_get_sync(&client->dev);
 782         if (ret < 0)
 783                 return ret;
 784
 785         set_bit(I2C_HID_STARTED, &ihid->flags);
 786         return 0;
 787 }
 788
 789 static void i2c_hid_close(struct hid_device *hid)
 790 {
 791         struct i2c_client *client = hid->driver_data;
 792         struct i2c_hid *ihid = i2c_get_clientdata(client);
 793
 794         clear_bit(I2C_HID_STARTED, &ihid->flags);
 795
 796         /* Save some power */
 797         pm_runtime_put(&client->dev);
 798 }
 799
 800 static int i2c_hid_power(struct hid_device *hid, int lvl)
 801 {
 802         struct i2c_client *client = hid->driver_data;
 803         struct i2c_hid *ihid = i2c_get_clientdata(client);
 804
 805         i2c_hid_dbg(ihid, "%s lvl:%d\n", __func__, lvl);
 806
 807         switch (lvl) {
 808         case PM_HINT_FULLON:
 809                 pm_runtime_get_sync(&client->dev);
 810                 break;
 811         case PM_HINT_NORMAL:
 812                 pm_runtime_put(&client->dev);
 813                 break;
 814         }
 815         return 0;
 816 }
 817
 818 struct hid_ll_driver i2c_hid_ll_driver = {
 819         .parse = i2c_hid_parse,
 820         .start = i2c_hid_start,
 821         .stop = i2c_hid_stop,
 822         .open = i2c_hid_open,
 823         .close = i2c_hid_close,
 824         .power = i2c_hid_power,
 825         .output_report = i2c_hid_output_report,
 826         .raw_request = i2c_hid_raw_request,
 827 };
 828 EXPORT_SYMBOL_GPL(i2c_hid_ll_driver);
 829
 830 static int i2c_hid_init_irq(struct i2c_client *client)
 831 {
 832         struct i2c_hid *ihid = i2c_get_clientdata(client);
 833         unsigned long irqflags = 0;
 834         int ret;
 835
 836         dev_dbg(&client->dev, "Requesting IRQ: %d\n", client->irq);
 837
 838         if (!irq_get_trigger_type(client->irq))
 839                 irqflags = IRQF_TRIGGER_LOW;
 840
 841         ret = request_threaded_irq(client->irq, NULL, i2c_hid_irq,
 842                                    irqflags | IRQF_ONESHOT, client->name, ihid);
 843         if (ret < 0) {
 844                 dev_warn(&client->dev,
 845                         "Could not register for %s interrupt, irq = %d,"
 846                         " ret = %d\n",
 847                         client->name, client->irq, ret);
 848
 849                 return ret;
 850         }
 851
 852         return 0;
 853 }
 854
 855 static int i2c_hid_fetch_hid_descriptor(struct i2c_hid *ihid)
 856 {
 857         struct i2c_client *client = ihid->client;
 858         struct i2c_hid_desc *hdesc = &ihid->hdesc;
 859         unsigned int dsize;
 860         int ret;
 861
 862         /* i2c hid fetch using a fixed descriptor size (30 bytes) */
 863         if (i2c_hid_get_dmi_i2c_hid_desc_override(client->name)) {
 864                 i2c_hid_dbg(ihid, "Using a HID descriptor override\n");
 865                 ihid->hdesc =
 866                         *i2c_hid_get_dmi_i2c_hid_desc_override(client->name);
 867         } else {
 868                 i2c_hid_dbg(ihid, "Fetching the HID descriptor\n");
 869                 ret = i2c_hid_command(client, &hid_descr_cmd,
 870                                       ihid->hdesc_buffer,
 871                                       sizeof(struct i2c_hid_desc));
 872                 if (ret) {
 873                         dev_err(&client->dev, "hid_descr_cmd failed\n");
 874                         return -ENODEV;
 875                 }
 876         }
 877
 878         /* Validate the length of HID descriptor, the 4 first bytes:
 879          * bytes 0-1 -> length
 880          * bytes 2-3 -> bcdVersion (has to be 1.00) */
 881         /* check bcdVersion == 1.0 */
 882         if (le16_to_cpu(hdesc->bcdVersion) != 0x0100) {
 883                 dev_err(&client->dev,
 884                         "unexpected HID descriptor bcdVersion (0x%04hx)\n",
 885                         le16_to_cpu(hdesc->bcdVersion));
 886                 return -ENODEV;
 887         }
 888
 889         /* Descriptor length should be 30 bytes as per the specification */
 890         dsize = le16_to_cpu(hdesc->wHIDDescLength);
 891         if (dsize != sizeof(struct i2c_hid_desc)) {
 892                 dev_err(&client->dev, "weird size of HID descriptor (%u)\n",
 893                         dsize);
 894                 return -ENODEV;
 895         }
 896         i2c_hid_dbg(ihid, "HID Descriptor: %*ph\n", dsize, ihid->hdesc_buffer);
 897         return 0;
 898 }
 899
 900 #ifdef CONFIG_ACPI
 901 static int i2c_hid_acpi_pdata(struct i2c_client *client,
 902                 struct i2c_hid_platform_data *pdata)
 903 {
 904         static guid_t i2c_hid_guid =
 905                 GUID_INIT(0x3CDFF6F7, 0x4267, 0x4555,
 906                           0xAD, 0x05, 0xB3, 0x0A, 0x3D, 0x89, 0x38, 0xDE);
 907         union acpi_object *obj;
 908         struct acpi_device *adev;
 909         acpi_handle handle;
 910
 911         handle = ACPI_HANDLE(&client->dev);
 912         if (!handle || acpi_bus_get_device(handle, &adev))
 913                 return -ENODEV;
 914
 915         obj = acpi_evaluate_dsm_typed(handle, &i2c_hid_guid, 1, 1, NULL,
 916                                       ACPI_TYPE_INTEGER);
 917         if (!obj) {
 918                 dev_err(&client->dev, "device _DSM execution failed\n");
 919                 return -ENODEV;
 920         }
 921
 922         pdata->hid_descriptor_address = obj->integer.value;
 923         ACPI_FREE(obj);
 924
 925         return 0;
 926 }
 927
 928 static void i2c_hid_acpi_fix_up_power(struct device *dev)
 929 {
 930         acpi_handle handle = ACPI_HANDLE(dev);
 931         struct acpi_device *adev;
 932
 933         if (handle && acpi_bus_get_device(handle, &adev) == 0)
 934                 acpi_device_fix_up_power(adev);
 935 }
 936
 937 static const struct acpi_device_id i2c_hid_acpi_match[] = {
 938         {"ACPI0C50", 0 },
 939         {"PNP0C50", 0 },
 940         { },
 941 };
 942 MODULE_DEVICE_TABLE(acpi, i2c_hid_acpi_match);
 943 #else
 944 static inline int i2c_hid_acpi_pdata(struct i2c_client *client,
 945                 struct i2c_hid_platform_data *pdata)
 946 {
 947         return -ENODEV;
 948 }
 949
 950 static inline void i2c_hid_acpi_fix_up_power(struct device *dev) {}
 951 #endif
 952
 953 #ifdef CONFIG_OF
 954 static int i2c_hid_of_probe(struct i2c_client *client,
 955                 struct i2c_hid_platform_data *pdata)
 956 {
 957         struct device *dev = &client->dev;
 958         u32 val;
 959         int ret;
 960
 961         ret = of_property_read_u32(dev->of_node, "hid-descr-addr", &val);
 962         if (ret) {
 963                 dev_err(&client->dev, "HID register address not provided\n");
 964                 return -ENODEV;
 965         }
 966         if (val >> 16) {
 967                 dev_err(&client->dev, "Bad HID register address: 0x%08x\n",
 968                         val);
 969                 return -EINVAL;
 970         }
 971         pdata->hid_descriptor_address = val;
 972
 973         ret = of_property_read_u32(dev->of_node, "post-power-on-delay-ms",
 974                                    &val);
 975         if (!ret)
 976                 pdata->post_power_delay_ms = val;
 977
 978         return 0;
 979 }
 980
 981 static const struct of_device_id i2c_hid_of_match[] = {
 982         { .compatible = "hid-over-i2c" },
 983         {},
 984 };
 985 MODULE_DEVICE_TABLE(of, i2c_hid_of_match);
 986 #else
 987 static inline int i2c_hid_of_probe(struct i2c_client *client,
 988                 struct i2c_hid_platform_data *pdata)
 989 {
 990         return -ENODEV;
 991 }
 992 #endif
 993
 994 static int i2c_hid_probe(struct i2c_client *client,
 995                          const struct i2c_device_id *dev_id)
 996 {
 997         int ret;
 998         struct i2c_hid *ihid;
 999         struct hid_device *hid;
1000         __u16 hidRegister;
1001         struct i2c_hid_platform_data *platform_data = client->dev.platform_data;
1002
1003         dbg_hid("HID probe called for i2c 0x%02x\n", client->addr);
1004
1005         if (!client->irq) {
1006                 dev_err(&client->dev,
1007                         "HID over i2c has not been provided an Int IRQ\n");
1008                 return -EINVAL;
1009         }
1010
1011         if (client->irq < 0) {
1012                 if (client->irq != -EPROBE_DEFER)
1013                         dev_err(&client->dev,
1014                                 "HID over i2c doesn't have a valid IRQ\n");
1015                 return client->irq;
1016         }
1017
1018         ihid = kzalloc(sizeof(struct i2c_hid), GFP_KERNEL);
1019         if (!ihid)
1020                 return -ENOMEM;
1021
1022         if (client->dev.of_node) {
1023                 ret = i2c_hid_of_probe(client, &ihid->pdata);
1024                 if (ret)
1025                         goto err;
1026         } else if (!platform_data) {
1027                 ret = i2c_hid_acpi_pdata(client, &ihid->pdata);
1028                 if (ret) {
1029                         dev_err(&client->dev,
1030                                 "HID register address not provided\n");
1031                         goto err;
1032                 }
1033         } else {
1034                 ihid->pdata = *platform_data;
1035         }
1036
1037         ihid->pdata.supply = devm_regulator_get(&client->dev, "vdd");
1038         if (IS_ERR(ihid->pdata.supply)) {
1039                 ret = PTR_ERR(ihid->pdata.supply);
1040                 if (ret != -EPROBE_DEFER)
1041                         dev_err(&client->dev, "Failed to get regulator: %d\n",
1042                                 ret);
1043                 goto err;
1044         }
1045
1046         ret = regulator_enable(ihid->pdata.supply);
1047         if (ret < 0) {
1048                 dev_err(&client->dev, "Failed to enable regulator: %d\n",
1049                         ret);
1050                 goto err;
1051         }
1052         if (ihid->pdata.post_power_delay_ms)
1053                 msleep(ihid->pdata.post_power_delay_ms);
1054
1055         i2c_set_clientdata(client, ihid);
1056
1057         ihid->client = client;
1058
1059         hidRegister = ihid->pdata.hid_descriptor_address;
1060         ihid->wHIDDescRegister = cpu_to_le16(hidRegister);
1061
1062         init_waitqueue_head(&ihid->wait);
1063         mutex_init(&ihid->reset_lock);
1064
1065         /* we need to allocate the command buffer without knowing the maximum
1066          * size of the reports. Let's use HID_MIN_BUFFER_SIZE, then we do the
1067          * real computation later. */
1068         ret = i2c_hid_alloc_buffers(ihid, HID_MIN_BUFFER_SIZE);
1069         if (ret < 0)
1070                 goto err_regulator;
1071
1072         i2c_hid_acpi_fix_up_power(&client->dev);
1073
1074         pm_runtime_get_noresume(&client->dev);
1075         pm_runtime_set_active(&client->dev);
1076         pm_runtime_enable(&client->dev);
1077         device_enable_async_suspend(&client->dev);
1078
1079         /* Make sure there is something at this address */
1080         ret = i2c_smbus_read_byte(client);
1081         if (ret < 0) {
1082                 dev_dbg(&client->dev, "nothing at this address: %d\n", ret);
1083                 ret = -ENXIO;
1084                 goto err_pm;
1085         }
1086
1087         ret = i2c_hid_fetch_hid_descriptor(ihid);
1088         if (ret < 0)
1089                 goto err_pm;
1090
1091         ret = i2c_hid_init_irq(client);
1092         if (ret < 0)
1093                 goto err_pm;
1094
1095         hid = hid_allocate_device();
1096         if (IS_ERR(hid)) {
1097                 ret = PTR_ERR(hid);
1098                 goto err_irq;
1099         }
1100
1101         ihid->hid = hid;
1102
1103         hid->driver_data = client;
1104         hid->ll_driver = &i2c_hid_ll_driver;
1105         hid->dev.parent = &client->dev;
1106         hid->bus = BUS_I2C;
1107         hid->version = le16_to_cpu(ihid->hdesc.bcdVersion);
1108         hid->vendor = le16_to_cpu(ihid->hdesc.wVendorID);
1109         hid->product = le16_to_cpu(ihid->hdesc.wProductID);
1110
1111         snprintf(hid->name, sizeof(hid->name), "%s %04X:%04X",
1112                  client->name, (u16)hid->vendor, (u16)hid->product);
1113         strlcpy(hid->phys, dev_name(&client->dev), sizeof(hid->phys));
1114
1115         ihid->quirks = i2c_hid_lookup_quirk(hid->vendor, hid->product);
1116
1117         ret = hid_add_device(hid);
1118         if (ret) {
1119                 if (ret != -ENODEV)
1120                         hid_err(client, "can't add hid device: %d\n", ret);
1121                 goto err_mem_free;
1122         }
1123
1124         pm_runtime_put(&client->dev);
1125         return 0;
1126
1127 err_mem_free:
1128         hid_destroy_device(hid);
1129
1130 err_irq:
1131         free_irq(client->irq, ihid);
1132
1133 err_pm:
1134         pm_runtime_put_noidle(&client->dev);
1135         pm_runtime_disable(&client->dev);
1136
1137 err_regulator:
1138         regulator_disable(ihid->pdata.supply);
1139
1140 err:
1141         i2c_hid_free_buffers(ihid);
1142         kfree(ihid);
1143         return ret;
1144 }
1145
1146 static int i2c_hid_remove(struct i2c_client *client)
1147 {
1148         struct i2c_hid *ihid = i2c_get_clientdata(client);
1149         struct hid_device *hid;
1150
1151         pm_runtime_get_sync(&client->dev);
1152         pm_runtime_disable(&client->dev);
1153         pm_runtime_set_suspended(&client->dev);
1154         pm_runtime_put_noidle(&client->dev);
1155
1156         hid = ihid->hid;
1157         hid_destroy_device(hid);
1158
1159         free_irq(client->irq, ihid);
1160
1161         if (ihid->bufsize)
1162                 i2c_hid_free_buffers(ihid);
1163
1164         regulator_disable(ihid->pdata.supply);
1165
1166         kfree(ihid);
1167
1168         return 0;
1169 }
1170
1171 static void i2c_hid_shutdown(struct i2c_client *client)
1172 {
1173         struct i2c_hid *ihid = i2c_get_clientdata(client);
1174
1175         i2c_hid_set_power(client, I2C_HID_PWR_SLEEP);
1176         free_irq(client->irq, ihid);
1177 }
1178
1179 #ifdef CONFIG_PM_SLEEP
1180 static int i2c_hid_suspend(struct device *dev)
1181 {
1182         struct i2c_client *client = to_i2c_client(dev);
1183         struct i2c_hid *ihid = i2c_get_clientdata(client);
1184         struct hid_device *hid = ihid->hid;
1185         int ret;
1186         int wake_status;
1187
1188         if (hid->driver && hid->driver->suspend) {
1189                 /*
1190                  * Wake up the device so that IO issues in
1191                  * HID driver's suspend code can succeed.
1192                  */
1193                 ret = pm_runtime_resume(dev);
1194                 if (ret < 0)
1195                         return ret;
1196
1197                 ret = hid->driver->suspend(hid, PMSG_SUSPEND);
1198                 if (ret < 0)
1199                         return ret;
1200         }
1201
1202         if (!pm_runtime_suspended(dev)) {
1203                 /* Save some power */
1204                 i2c_hid_set_power(client, I2C_HID_PWR_SLEEP);
1205
1206                 disable_irq(client->irq);
1207         }
1208
1209         if (device_may_wakeup(&client->dev)) {
1210                 wake_status = enable_irq_wake(client->irq);
1211                 if (!wake_status)
1212                         ihid->irq_wake_enabled = true;
1213                 else
1214                         hid_warn(hid, "Failed to enable irq wake: %d\n",
1215                                 wake_status);
1216         } else {
1217                 ret = regulator_disable(ihid->pdata.supply);
1218                 if (ret < 0)
1219                         hid_warn(hid, "Failed to disable supply: %d\n", ret);
1220         }
1221
1222         return 0;
1223 }
1224
1225 static int i2c_hid_resume(struct device *dev)
1226 {
1227         int ret;
1228         struct i2c_client *client = to_i2c_client(dev);
1229         struct i2c_hid *ihid = i2c_get_clientdata(client);
1230         struct hid_device *hid = ihid->hid;
1231         int wake_status;
1232
1233         if (!device_may_wakeup(&client->dev)) {
1234                 ret = regulator_enable(ihid->pdata.supply);
1235                 if (ret < 0)
1236                         hid_warn(hid, "Failed to enable supply: %d\n", ret);
1237                 if (ihid->pdata.post_power_delay_ms)
1238                         msleep(ihid->pdata.post_power_delay_ms);
1239         } else if (ihid->irq_wake_enabled) {
1240                 wake_status = disable_irq_wake(client->irq);
1241                 if (!wake_status)
1242                         ihid->irq_wake_enabled = false;
1243                 else
1244                         hid_warn(hid, "Failed to disable irq wake: %d\n",
1245                                 wake_status);
1246         }
1247
1248         /* We'll resume to full power */
1249         pm_runtime_disable(dev);
1250         pm_runtime_set_active(dev);
1251         pm_runtime_enable(dev);
1252
1253         enable_irq(client->irq);
1254         ret = i2c_hid_hwreset(client);
1255         if (ret)
1256                 return ret;
1257
1258         if (hid->driver && hid->driver->reset_resume) {
1259                 ret = hid->driver->reset_resume(hid);
1260                 return ret;
1261         }
1262
1263         return 0;
1264 }
1265 #endif
1266
1267 #ifdef CONFIG_PM
1268 static int i2c_hid_runtime_suspend(struct device *dev)
1269 {
1270         struct i2c_client *client = to_i2c_client(dev);
1271
1272         i2c_hid_set_power(client, I2C_HID_PWR_SLEEP);
1273         disable_irq(client->irq);
1274         return 0;
1275 }
1276
1277 static int i2c_hid_runtime_resume(struct device *dev)
1278 {
1279         struct i2c_client *client = to_i2c_client(dev);
1280
1281         enable_irq(client->irq);
1282         i2c_hid_set_power(client, I2C_HID_PWR_ON);
1283         return 0;
1284 }
1285 #endif
1286
1287 static const struct dev_pm_ops i2c_hid_pm = {
1288         SET_SYSTEM_SLEEP_PM_OPS(i2c_hid_suspend, i2c_hid_resume)
1289         SET_RUNTIME_PM_OPS(i2c_hid_runtime_suspend, i2c_hid_runtime_resume,
1290                            NULL)
1291 };
1292
1293 static const struct i2c_device_id i2c_hid_id_table[] = {
1294         { "hid", 0 },
1295         { "hid-over-i2c", 0 },
1296         { },
1297 };
1298 MODULE_DEVICE_TABLE(i2c, i2c_hid_id_table);
1299
1300
1301 static struct i2c_driver i2c_hid_driver = {
1302         .driver = {
1303                 .name   = "i2c_hid",
1304                 .pm     = &i2c_hid_pm,
1305                 .acpi_match_table = ACPI_PTR(i2c_hid_acpi_match),
1306                 .of_match_table = of_match_ptr(i2c_hid_of_match),
1307         },
1308
1309         .probe          = i2c_hid_probe,
1310         .remove         = i2c_hid_remove,
1311         .shutdown       = i2c_hid_shutdown,
1312         .id_table       = i2c_hid_id_table,
1313 };
1314
1315 module_i2c_driver(i2c_hid_driver);
1316
1317 MODULE_DESCRIPTION("HID over I2C core driver");
1318 MODULE_AUTHOR("Benjamin Tissoires <benjamin.tissoires@gmail.com>");
1319 MODULE_LICENSE("GPL");