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/device.h>
  30 #include <linux/wait.h>
  31 #include <linux/err.h>
  32 #include <linux/string.h>
  33 #include <linux/list.h>
  34 #include <linux/jiffies.h>
  35 #include <linux/kernel.h>
  36 #include <linux/hid.h>
  37 #include <linux/mutex.h>
  38 #include <linux/acpi.h>
  39 #include <linux/of.h>
  40 #include <linux/regulator/consumer.h>
  41
  42 #include <linux/platform_data/i2c-hid.h>
  43
  44 #include "../hid-ids.h"
  45 #include "i2c-hid.h"
  46
  47 /* quirks to control the device */
  48 #define I2C_HID_QUIRK_SET_PWR_WAKEUP_DEV        BIT(0)
  49 #define I2C_HID_QUIRK_NO_IRQ_AFTER_RESET        BIT(1)
  50 #define I2C_HID_QUIRK_BOGUS_IRQ                 BIT(4)
  51 #define I2C_HID_QUIRK_RESET_ON_RESUME           BIT(5)
  52 #define I2C_HID_QUIRK_BAD_INPUT_SIZE            BIT(6)
  53
  54
  55 /* flags */
  56 #define I2C_HID_STARTED         0
  57 #define I2C_HID_RESET_PENDING   1
  58 #define I2C_HID_READ_PENDING    2
  59
  60 #define I2C_HID_PWR_ON          0x00
  61 #define I2C_HID_PWR_SLEEP       0x01
  62
  63 /* debug option */
  64 static bool debug;
  65 module_param(debug, bool, 0444);
  66 MODULE_PARM_DESC(debug, "print a lot of debug information");
  67
  68 #define i2c_hid_dbg(ihid, fmt, arg...)                                    \
  69 do {                                                                      \
  70         if (debug)                                                        \
  71                 dev_printk(KERN_DEBUG, &(ihid)->client->dev, fmt, ##arg); \
  72 } while (0)
  73
  74 struct i2c_hid_desc {
  75         __le16 wHIDDescLength;
  76         __le16 bcdVersion;
  77         __le16 wReportDescLength;
  78         __le16 wReportDescRegister;
  79         __le16 wInputRegister;
  80         __le16 wMaxInputLength;
  81         __le16 wOutputRegister;
  82         __le16 wMaxOutputLength;
  83         __le16 wCommandRegister;
  84         __le16 wDataRegister;
  85         __le16 wVendorID;
  86         __le16 wProductID;
  87         __le16 wVersionID;
  88         __le32 reserved;
  89 } __packed;
  90
  91 struct i2c_hid_cmd {
  92         unsigned int registerIndex;
  93         __u8 opcode;
  94         unsigned int length;
  95         bool wait;
  96 };
  97
  98 union command {
  99         u8 data[0];
 100         struct cmd {
 101                 __le16 reg;
 102                 __u8 reportTypeID;
 103                 __u8 opcode;
 104         } __packed c;
 105 };
 106
 107 #define I2C_HID_CMD(opcode_) \
 108         .opcode = opcode_, .length = 4, \
 109         .registerIndex = offsetof(struct i2c_hid_desc, wCommandRegister)
 110
 111 /* fetch HID descriptor */
 112 static const struct i2c_hid_cmd hid_descr_cmd = { .length = 2 };
 113 /* fetch report descriptors */
 114 static const struct i2c_hid_cmd hid_report_descr_cmd = {
 115                 .registerIndex = offsetof(struct i2c_hid_desc,
 116                         wReportDescRegister),
 117                 .opcode = 0x00,
 118                 .length = 2 };
 119 /* commands */
 120 static const struct i2c_hid_cmd hid_reset_cmd =         { I2C_HID_CMD(0x01),
 121                                                           .wait = true };
 122 static const struct i2c_hid_cmd hid_get_report_cmd =    { I2C_HID_CMD(0x02) };
 123 static const struct i2c_hid_cmd hid_set_report_cmd =    { I2C_HID_CMD(0x03) };
 124 static const struct i2c_hid_cmd hid_set_power_cmd =     { I2C_HID_CMD(0x08) };
 125 static const struct i2c_hid_cmd hid_no_cmd =            { .length = 0 };
 126
 127 /*
 128  * These definitions are not used here, but are defined by the spec.
 129  * Keeping them here for documentation purposes.
 130  *
 131  * static const struct i2c_hid_cmd hid_get_idle_cmd = { I2C_HID_CMD(0x04) };
 132  * static const struct i2c_hid_cmd hid_set_idle_cmd = { I2C_HID_CMD(0x05) };
 133  * static const struct i2c_hid_cmd hid_get_protocol_cmd = { I2C_HID_CMD(0x06) };
 134  * static const struct i2c_hid_cmd hid_set_protocol_cmd = { I2C_HID_CMD(0x07) };
 135  */
 136
 137 /* The main device structure */
 138 struct i2c_hid {
 139         struct i2c_client       *client;        /* i2c client */
 140         struct hid_device       *hid;   /* pointer to corresponding HID dev */
 141         union {
 142                 __u8 hdesc_buffer[sizeof(struct i2c_hid_desc)];
 143                 struct i2c_hid_desc hdesc;      /* the HID Descriptor */
 144         };
 145         __le16                  wHIDDescRegister; /* location of the i2c
 146                                                    * register of the HID
 147                                                    * descriptor. */
 148         unsigned int            bufsize;        /* i2c buffer size */
 149         u8                      *inbuf;         /* Input buffer */
 150         u8                      *rawbuf;        /* Raw Input buffer */
 151         u8                      *cmdbuf;        /* Command buffer */
 152         u8                      *argsbuf;       /* Command arguments buffer */
 153
 154         unsigned long           flags;          /* device flags */
 155         unsigned long           quirks;         /* Various quirks */
 156
 157         wait_queue_head_t       wait;           /* For waiting the interrupt */
 158
 159         struct i2c_hid_platform_data pdata;
 160
 161         bool                    irq_wake_enabled;
 162         struct mutex            reset_lock;
 163 };
 164
 165 static const struct i2c_hid_quirks {
 166         __u16 idVendor;
 167         __u16 idProduct;
 168         __u32 quirks;
 169 } i2c_hid_quirks[] = {
 170         { USB_VENDOR_ID_WEIDA, HID_ANY_ID,
 171                 I2C_HID_QUIRK_SET_PWR_WAKEUP_DEV },
 172         { I2C_VENDOR_ID_HANTICK, I2C_PRODUCT_ID_HANTICK_5288,
 173                 I2C_HID_QUIRK_NO_IRQ_AFTER_RESET },
 174         { I2C_VENDOR_ID_RAYDIUM, I2C_PRODUCT_ID_RAYDIUM_3118,
 175                 I2C_HID_QUIRK_NO_IRQ_AFTER_RESET },
 176         { USB_VENDOR_ID_ELAN, HID_ANY_ID,
 177                  I2C_HID_QUIRK_BOGUS_IRQ },
 178         { USB_VENDOR_ID_ALPS_JP, HID_ANY_ID,
 179                  I2C_HID_QUIRK_RESET_ON_RESUME },
 180         { I2C_VENDOR_ID_SYNAPTICS, I2C_PRODUCT_ID_SYNAPTICS_SYNA2393,
 181                  I2C_HID_QUIRK_RESET_ON_RESUME },
 182         { USB_VENDOR_ID_ITE, I2C_DEVICE_ID_ITE_LENOVO_LEGION_Y720,
 183                 I2C_HID_QUIRK_BAD_INPUT_SIZE },
 184         { 0, 0 }
 185 };
 186
 187 /*
 188  * i2c_hid_lookup_quirk: return any quirks associated with a I2C HID device
 189  * @idVendor: the 16-bit vendor ID
 190  * @idProduct: the 16-bit product ID
 191  *
 192  * Returns: a u32 quirks value.
 193  */
 194 static u32 i2c_hid_lookup_quirk(const u16 idVendor, const u16 idProduct)
 195 {
 196         u32 quirks = 0;
 197         int n;
 198
 199         for (n = 0; i2c_hid_quirks[n].idVendor; n++)
 200                 if (i2c_hid_quirks[n].idVendor == idVendor &&
 201                     (i2c_hid_quirks[n].idProduct == (__u16)HID_ANY_ID ||
 202                      i2c_hid_quirks[n].idProduct == idProduct))
 203                         quirks = i2c_hid_quirks[n].quirks;
 204
 205         return quirks;
 206 }
 207
 208 static int __i2c_hid_command(struct i2c_client *client,
 209                 const struct i2c_hid_cmd *command, u8 reportID,
 210                 u8 reportType, u8 *args, int args_len,
 211                 unsigned char *buf_recv, int data_len)
 212 {
 213         struct i2c_hid *ihid = i2c_get_clientdata(client);
 214         union command *cmd = (union command *)ihid->cmdbuf;
 215         int ret;
 216         struct i2c_msg msg[2];
 217         int msg_num = 1;
 218
 219         int length = command->length;
 220         bool wait = command->wait;
 221         unsigned int registerIndex = command->registerIndex;
 222
 223         /* special case for hid_descr_cmd */
 224         if (command == &hid_descr_cmd) {
 225                 cmd->c.reg = ihid->wHIDDescRegister;
 226         } else {
 227                 cmd->data[0] = ihid->hdesc_buffer[registerIndex];
 228                 cmd->data[1] = ihid->hdesc_buffer[registerIndex + 1];
 229         }
 230
 231         if (length > 2) {
 232                 cmd->c.opcode = command->opcode;
 233                 cmd->c.reportTypeID = reportID | reportType << 4;
 234         }
 235
 236         memcpy(cmd->data + length, args, args_len);
 237         length += args_len;
 238
 239         i2c_hid_dbg(ihid, "%s: cmd=%*ph\n", __func__, length, cmd->data);
 240
 241         msg[0].addr = client->addr;
 242         msg[0].flags = client->flags & I2C_M_TEN;
 243         msg[0].len = length;
 244         msg[0].buf = cmd->data;
 245         if (data_len > 0) {
 246                 msg[1].addr = client->addr;
 247                 msg[1].flags = client->flags & I2C_M_TEN;
 248                 msg[1].flags |= I2C_M_RD;
 249                 msg[1].len = data_len;
 250                 msg[1].buf = buf_recv;
 251                 msg_num = 2;
 252                 set_bit(I2C_HID_READ_PENDING, &ihid->flags);
 253         }
 254
 255         if (wait)
 256                 set_bit(I2C_HID_RESET_PENDING, &ihid->flags);
 257
 258         ret = i2c_transfer(client->adapter, msg, msg_num);
 259
 260         if (data_len > 0)
 261                 clear_bit(I2C_HID_READ_PENDING, &ihid->flags);
 262
 263         if (ret != msg_num)
 264                 return ret < 0 ? ret : -EIO;
 265
 266         ret = 0;
 267
 268         if (wait && (ihid->quirks & I2C_HID_QUIRK_NO_IRQ_AFTER_RESET)) {
 269                 msleep(100);
 270         } else if (wait) {
 271                 i2c_hid_dbg(ihid, "%s: waiting...\n", __func__);
 272                 if (!wait_event_timeout(ihid->wait,
 273                                 !test_bit(I2C_HID_RESET_PENDING, &ihid->flags),
 274                                 msecs_to_jiffies(5000)))
 275                         ret = -ENODATA;
 276                 i2c_hid_dbg(ihid, "%s: finished.\n", __func__);
 277         }
 278
 279         return ret;
 280 }
 281
 282 static int i2c_hid_command(struct i2c_client *client,
 283                 const struct i2c_hid_cmd *command,
 284                 unsigned char *buf_recv, int data_len)
 285 {
 286         return __i2c_hid_command(client, command, 0, 0, NULL, 0,
 287                                 buf_recv, data_len);
 288 }
 289
 290 static int i2c_hid_get_report(struct i2c_client *client, u8 reportType,
 291                 u8 reportID, unsigned char *buf_recv, int data_len)
 292 {
 293         struct i2c_hid *ihid = i2c_get_clientdata(client);
 294         u8 args[3];
 295         int ret;
 296         int args_len = 0;
 297         u16 readRegister = le16_to_cpu(ihid->hdesc.wDataRegister);
 298
 299         i2c_hid_dbg(ihid, "%s\n", __func__);
 300
 301         if (reportID >= 0x0F) {
 302                 args[args_len++] = reportID;
 303                 reportID = 0x0F;
 304         }
 305
 306         args[args_len++] = readRegister & 0xFF;
 307         args[args_len++] = readRegister >> 8;
 308
 309         ret = __i2c_hid_command(client, &hid_get_report_cmd, reportID,
 310                 reportType, args, args_len, buf_recv, data_len);
 311         if (ret) {
 312                 dev_err(&client->dev,
 313                         "failed to retrieve report from device.\n");
 314                 return ret;
 315         }
 316
 317         return 0;
 318 }
 319
 320 /**
 321  * i2c_hid_set_or_send_report: forward an incoming report to the device
 322  * @client: the i2c_client of the device
 323  * @reportType: 0x03 for HID_FEATURE_REPORT ; 0x02 for HID_OUTPUT_REPORT
 324  * @reportID: the report ID
 325  * @buf: the actual data to transfer, without the report ID
 326  * @len: size of buf
 327  * @use_data: true: use SET_REPORT HID command, false: send plain OUTPUT report
 328  */
 329 static int i2c_hid_set_or_send_report(struct i2c_client *client, u8 reportType,
 330                 u8 reportID, unsigned char *buf, size_t data_len, bool use_data)
 331 {
 332         struct i2c_hid *ihid = i2c_get_clientdata(client);
 333         u8 *args = ihid->argsbuf;
 334         const struct i2c_hid_cmd *hidcmd;
 335         int ret;
 336         u16 dataRegister = le16_to_cpu(ihid->hdesc.wDataRegister);
 337         u16 outputRegister = le16_to_cpu(ihid->hdesc.wOutputRegister);
 338         u16 maxOutputLength = le16_to_cpu(ihid->hdesc.wMaxOutputLength);
 339         u16 size;
 340         int args_len;
 341         int index = 0;
 342
 343         i2c_hid_dbg(ihid, "%s\n", __func__);
 344
 345         if (data_len > ihid->bufsize)
 346                 return -EINVAL;
 347
 348         size =          2                       /* size */ +
 349                         (reportID ? 1 : 0)      /* reportID */ +
 350                         data_len                /* buf */;
 351         args_len =      (reportID >= 0x0F ? 1 : 0) /* optional third byte */ +
 352                         2                       /* dataRegister */ +
 353                         size                    /* args */;
 354
 355         if (!use_data && maxOutputLength == 0)
 356                 return -ENOSYS;
 357
 358         if (reportID >= 0x0F) {
 359                 args[index++] = reportID;
 360                 reportID = 0x0F;
 361         }
 362
 363         /*
 364          * use the data register for feature reports or if the device does not
 365          * support the output register
 366          */
 367         if (use_data) {
 368                 args[index++] = dataRegister & 0xFF;
 369                 args[index++] = dataRegister >> 8;
 370                 hidcmd = &hid_set_report_cmd;
 371         } else {
 372                 args[index++] = outputRegister & 0xFF;
 373                 args[index++] = outputRegister >> 8;
 374                 hidcmd = &hid_no_cmd;
 375         }
 376
 377         args[index++] = size & 0xFF;
 378         args[index++] = size >> 8;
 379
 380         if (reportID)
 381                 args[index++] = reportID;
 382
 383         memcpy(&args[index], buf, data_len);
 384
 385         ret = __i2c_hid_command(client, hidcmd, reportID,
 386                 reportType, args, args_len, NULL, 0);
 387         if (ret) {
 388                 dev_err(&client->dev, "failed to set a report to device.\n");
 389                 return ret;
 390         }
 391
 392         return data_len;
 393 }
 394
 395 static int i2c_hid_set_power(struct i2c_client *client, int power_state)
 396 {
 397         struct i2c_hid *ihid = i2c_get_clientdata(client);
 398         int ret;
 399
 400         i2c_hid_dbg(ihid, "%s\n", __func__);
 401
 402         /*
 403          * Some devices require to send a command to wakeup before power on.
 404          * The call will get a return value (EREMOTEIO) but device will be
 405          * triggered and activated. After that, it goes like a normal device.
 406          */
 407         if (power_state == I2C_HID_PWR_ON &&
 408             ihid->quirks & I2C_HID_QUIRK_SET_PWR_WAKEUP_DEV) {
 409                 ret = i2c_hid_command(client, &hid_set_power_cmd, NULL, 0);
 410
 411                 /* Device was already activated */
 412                 if (!ret)
 413                         goto set_pwr_exit;
 414         }
 415
 416         ret = __i2c_hid_command(client, &hid_set_power_cmd, power_state,
 417                 0, NULL, 0, NULL, 0);
 418
 419         if (ret)
 420                 dev_err(&client->dev, "failed to change power setting.\n");
 421
 422 set_pwr_exit:
 423         return ret;
 424 }
 425
 426 static int i2c_hid_hwreset(struct i2c_client *client)
 427 {
 428         struct i2c_hid *ihid = i2c_get_clientdata(client);
 429         int ret;
 430
 431         i2c_hid_dbg(ihid, "%s\n", __func__);
 432
 433         /*
 434          * This prevents sending feature reports while the device is
 435          * being reset. Otherwise we may lose the reset complete
 436          * interrupt.
 437          */
 438         mutex_lock(&ihid->reset_lock);
 439
 440         ret = i2c_hid_set_power(client, I2C_HID_PWR_ON);
 441         if (ret)
 442                 goto out_unlock;
 443
 444         /*
 445          * The HID over I2C specification states that if a DEVICE needs time
 446          * after the PWR_ON request, it should utilise CLOCK stretching.
 447          * However, it has been observered that the Windows driver provides a
 448          * 1ms sleep between the PWR_ON and RESET requests and that some devices
 449          * rely on this.
 450          */
 451         usleep_range(1000, 5000);
 452
 453         i2c_hid_dbg(ihid, "resetting...\n");
 454
 455         ret = i2c_hid_command(client, &hid_reset_cmd, NULL, 0);
 456         if (ret) {
 457                 dev_err(&client->dev, "failed to reset device.\n");
 458                 i2c_hid_set_power(client, I2C_HID_PWR_SLEEP);
 459                 goto out_unlock;
 460         }
 461
 462         /* At least some SIS devices need this after reset */
 463         ret = i2c_hid_set_power(client, I2C_HID_PWR_ON);
 464
 465 out_unlock:
 466         mutex_unlock(&ihid->reset_lock);
 467         return ret;
 468 }
 469
 470 static void i2c_hid_get_input(struct i2c_hid *ihid)
 471 {
 472         int ret;
 473         u32 ret_size;
 474         int size = le16_to_cpu(ihid->hdesc.wMaxInputLength);
 475
 476         if (size > ihid->bufsize)
 477                 size = ihid->bufsize;
 478
 479         ret = i2c_master_recv(ihid->client, ihid->inbuf, size);
 480         if (ret != size) {
 481                 if (ret < 0)
 482                         return;
 483
 484                 dev_err(&ihid->client->dev, "%s: got %d data instead of %d\n",
 485                         __func__, ret, size);
 486                 return;
 487         }
 488
 489         ret_size = ihid->inbuf[0] | ihid->inbuf[1] << 8;
 490
 491         if (!ret_size) {
 492                 /* host or device initiated RESET completed */
 493                 if (test_and_clear_bit(I2C_HID_RESET_PENDING, &ihid->flags))
 494                         wake_up(&ihid->wait);
 495                 return;
 496         }
 497
 498         if (ihid->quirks & I2C_HID_QUIRK_BOGUS_IRQ && ret_size == 0xffff) {
 499                 dev_warn_once(&ihid->client->dev, "%s: IRQ triggered but "
 500                               "there's no data\n", __func__);
 501                 return;
 502         }
 503
 504         if ((ret_size > size) || (ret_size < 2)) {
 505                 if (ihid->quirks & I2C_HID_QUIRK_BAD_INPUT_SIZE) {
 506                         ihid->inbuf[0] = size & 0xff;
 507                         ihid->inbuf[1] = size >> 8;
 508                         ret_size = size;
 509                 } else {
 510                         dev_err(&ihid->client->dev, "%s: incomplete report (%d/%d)\n",
 511                                 __func__, size, ret_size);
 512                         return;
 513                 }
 514         }
 515
 516         i2c_hid_dbg(ihid, "input: %*ph\n", ret_size, ihid->inbuf);
 517
 518         if (test_bit(I2C_HID_STARTED, &ihid->flags))
 519                 hid_input_report(ihid->hid, HID_INPUT_REPORT, ihid->inbuf + 2,
 520                                 ret_size - 2, 1);
 521
 522         return;
 523 }
 524
 525 static irqreturn_t i2c_hid_irq(int irq, void *dev_id)
 526 {
 527         struct i2c_hid *ihid = dev_id;
 528
 529         if (test_bit(I2C_HID_READ_PENDING, &ihid->flags))
 530                 return IRQ_HANDLED;
 531
 532         i2c_hid_get_input(ihid);
 533
 534         return IRQ_HANDLED;
 535 }
 536
 537 static int i2c_hid_get_report_length(struct hid_report *report)
 538 {
 539         return ((report->size - 1) >> 3) + 1 +
 540                 report->device->report_enum[report->type].numbered + 2;
 541 }
 542
 543 /*
 544  * Traverse the supplied list of reports and find the longest
 545  */
 546 static void i2c_hid_find_max_report(struct hid_device *hid, unsigned int type,
 547                 unsigned int *max)
 548 {
 549         struct hid_report *report;
 550         unsigned int size;
 551
 552         /* We should not rely on wMaxInputLength, as some devices may set it to
 553          * a wrong length. */
 554         list_for_each_entry(report, &hid->report_enum[type].report_list, list) {
 555                 size = i2c_hid_get_report_length(report);
 556                 if (*max < size)
 557                         *max = size;
 558         }
 559 }
 560
 561 static void i2c_hid_free_buffers(struct i2c_hid *ihid)
 562 {
 563         kfree(ihid->inbuf);
 564         kfree(ihid->rawbuf);
 565         kfree(ihid->argsbuf);
 566         kfree(ihid->cmdbuf);
 567         ihid->inbuf = NULL;
 568         ihid->rawbuf = NULL;
 569         ihid->cmdbuf = NULL;
 570         ihid->argsbuf = NULL;
 571         ihid->bufsize = 0;
 572 }
 573
 574 static int i2c_hid_alloc_buffers(struct i2c_hid *ihid, size_t report_size)
 575 {
 576         /* the worst case is computed from the set_report command with a
 577          * reportID > 15 and the maximum report length */
 578         int args_len = sizeof(__u8) + /* ReportID */
 579                        sizeof(__u8) + /* optional ReportID byte */
 580                        sizeof(__u16) + /* data register */
 581                        sizeof(__u16) + /* size of the report */
 582                        report_size; /* report */
 583
 584         ihid->inbuf = kzalloc(report_size, GFP_KERNEL);
 585         ihid->rawbuf = kzalloc(report_size, GFP_KERNEL);
 586         ihid->argsbuf = kzalloc(args_len, GFP_KERNEL);
 587         ihid->cmdbuf = kzalloc(sizeof(union command) + args_len, GFP_KERNEL);
 588
 589         if (!ihid->inbuf || !ihid->rawbuf || !ihid->argsbuf || !ihid->cmdbuf) {
 590                 i2c_hid_free_buffers(ihid);
 591                 return -ENOMEM;
 592         }
 593
 594         ihid->bufsize = report_size;
 595
 596         return 0;
 597 }
 598
 599 static int i2c_hid_get_raw_report(struct hid_device *hid,
 600                 unsigned char report_number, __u8 *buf, size_t count,
 601                 unsigned char report_type)
 602 {
 603         struct i2c_client *client = hid->driver_data;
 604         struct i2c_hid *ihid = i2c_get_clientdata(client);
 605         size_t ret_count, ask_count;
 606         int ret;
 607
 608         if (report_type == HID_OUTPUT_REPORT)
 609                 return -EINVAL;
 610
 611         /* +2 bytes to include the size of the reply in the query buffer */
 612         ask_count = min(count + 2, (size_t)ihid->bufsize);
 613
 614         ret = i2c_hid_get_report(client,
 615                         report_type == HID_FEATURE_REPORT ? 0x03 : 0x01,
 616                         report_number, ihid->rawbuf, ask_count);
 617
 618         if (ret < 0)
 619                 return ret;
 620
 621         ret_count = ihid->rawbuf[0] | (ihid->rawbuf[1] << 8);
 622
 623         if (ret_count <= 2)
 624                 return 0;
 625
 626         ret_count = min(ret_count, ask_count);
 627
 628         /* The query buffer contains the size, dropping it in the reply */
 629         count = min(count, ret_count - 2);
 630         memcpy(buf, ihid->rawbuf + 2, count);
 631
 632         return count;
 633 }
 634
 635 static int i2c_hid_output_raw_report(struct hid_device *hid, __u8 *buf,
 636                 size_t count, unsigned char report_type, bool use_data)
 637 {
 638         struct i2c_client *client = hid->driver_data;
 639         struct i2c_hid *ihid = i2c_get_clientdata(client);
 640         int report_id = buf[0];
 641         int ret;
 642
 643         if (report_type == HID_INPUT_REPORT)
 644                 return -EINVAL;
 645
 646         mutex_lock(&ihid->reset_lock);
 647
 648         if (report_id) {
 649                 buf++;
 650                 count--;
 651         }
 652
 653         ret = i2c_hid_set_or_send_report(client,
 654                                 report_type == HID_FEATURE_REPORT ? 0x03 : 0x02,
 655                                 report_id, buf, count, use_data);
 656
 657         if (report_id && ret >= 0)
 658                 ret++; /* add report_id to the number of transfered bytes */
 659
 660         mutex_unlock(&ihid->reset_lock);
 661
 662         return ret;
 663 }
 664
 665 static int i2c_hid_output_report(struct hid_device *hid, __u8 *buf,
 666                 size_t count)
 667 {
 668         return i2c_hid_output_raw_report(hid, buf, count, HID_OUTPUT_REPORT,
 669                         false);
 670 }
 671
 672 static int i2c_hid_raw_request(struct hid_device *hid, unsigned char reportnum,
 673                                __u8 *buf, size_t len, unsigned char rtype,
 674                                int reqtype)
 675 {
 676         switch (reqtype) {
 677         case HID_REQ_GET_REPORT:
 678                 return i2c_hid_get_raw_report(hid, reportnum, buf, len, rtype);
 679         case HID_REQ_SET_REPORT:
 680                 if (buf[0] != reportnum)
 681                         return -EINVAL;
 682                 return i2c_hid_output_raw_report(hid, buf, len, rtype, true);
 683         default:
 684                 return -EIO;
 685         }
 686 }
 687
 688 static int i2c_hid_parse(struct hid_device *hid)
 689 {
 690         struct i2c_client *client = hid->driver_data;
 691         struct i2c_hid *ihid = i2c_get_clientdata(client);
 692         struct i2c_hid_desc *hdesc = &ihid->hdesc;
 693         unsigned int rsize;
 694         char *rdesc;
 695         int ret;
 696         int tries = 3;
 697         char *use_override;
 698
 699         i2c_hid_dbg(ihid, "entering %s\n", __func__);
 700
 701         rsize = le16_to_cpu(hdesc->wReportDescLength);
 702         if (!rsize || rsize > HID_MAX_DESCRIPTOR_SIZE) {
 703                 dbg_hid("weird size of report descriptor (%u)\n", rsize);
 704                 return -EINVAL;
 705         }
 706
 707         do {
 708                 ret = i2c_hid_hwreset(client);
 709                 if (ret)
 710                         msleep(1000);
 711         } while (tries-- > 0 && ret);
 712
 713         if (ret)
 714                 return ret;
 715
 716         use_override = i2c_hid_get_dmi_hid_report_desc_override(client->name,
 717                                                                 &rsize);
 718
 719         if (use_override) {
 720                 rdesc = use_override;
 721                 i2c_hid_dbg(ihid, "Using a HID report descriptor override\n");
 722         } else {
 723                 rdesc = kzalloc(rsize, GFP_KERNEL);
 724
 725                 if (!rdesc) {
 726                         dbg_hid("couldn't allocate rdesc memory\n");
 727                         return -ENOMEM;
 728                 }
 729
 730                 i2c_hid_dbg(ihid, "asking HID report descriptor\n");
 731
 732                 ret = i2c_hid_command(client, &hid_report_descr_cmd,
 733                                       rdesc, rsize);
 734                 if (ret) {
 735                         hid_err(hid, "reading report descriptor failed\n");
 736                         kfree(rdesc);
 737                         return -EIO;
 738                 }
 739         }
 740
 741         i2c_hid_dbg(ihid, "Report Descriptor: %*ph\n", rsize, rdesc);
 742
 743         ret = hid_parse_report(hid, rdesc, rsize);
 744         if (!use_override)
 745                 kfree(rdesc);
 746
 747         if (ret) {
 748                 dbg_hid("parsing report descriptor failed\n");
 749                 return ret;
 750         }
 751
 752         return 0;
 753 }
 754
 755 static int i2c_hid_start(struct hid_device *hid)
 756 {
 757         struct i2c_client *client = hid->driver_data;
 758         struct i2c_hid *ihid = i2c_get_clientdata(client);
 759         int ret;
 760         unsigned int bufsize = HID_MIN_BUFFER_SIZE;
 761
 762         i2c_hid_find_max_report(hid, HID_INPUT_REPORT, &bufsize);
 763         i2c_hid_find_max_report(hid, HID_OUTPUT_REPORT, &bufsize);
 764         i2c_hid_find_max_report(hid, HID_FEATURE_REPORT, &bufsize);
 765
 766         if (bufsize > ihid->bufsize) {
 767                 disable_irq(client->irq);
 768                 i2c_hid_free_buffers(ihid);
 769
 770                 ret = i2c_hid_alloc_buffers(ihid, bufsize);
 771                 enable_irq(client->irq);
 772
 773                 if (ret)
 774                         return ret;
 775         }
 776
 777         return 0;
 778 }
 779
 780 static void i2c_hid_stop(struct hid_device *hid)
 781 {
 782         hid->claimed = 0;
 783 }
 784
 785 static int i2c_hid_open(struct hid_device *hid)
 786 {
 787         struct i2c_client *client = hid->driver_data;
 788         struct i2c_hid *ihid = i2c_get_clientdata(client);
 789
 790         set_bit(I2C_HID_STARTED, &ihid->flags);
 791         return 0;
 792 }
 793
 794 static void i2c_hid_close(struct hid_device *hid)
 795 {
 796         struct i2c_client *client = hid->driver_data;
 797         struct i2c_hid *ihid = i2c_get_clientdata(client);
 798
 799         clear_bit(I2C_HID_STARTED, &ihid->flags);
 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         .output_report = i2c_hid_output_report,
 809         .raw_request = i2c_hid_raw_request,
 810 };
 811 EXPORT_SYMBOL_GPL(i2c_hid_ll_driver);
 812
 813 static int i2c_hid_init_irq(struct i2c_client *client)
 814 {
 815         struct i2c_hid *ihid = i2c_get_clientdata(client);
 816         unsigned long irqflags = 0;
 817         int ret;
 818
 819         dev_dbg(&client->dev, "Requesting IRQ: %d\n", client->irq);
 820
 821         if (!irq_get_trigger_type(client->irq))
 822                 irqflags = IRQF_TRIGGER_LOW;
 823
 824         ret = request_threaded_irq(client->irq, NULL, i2c_hid_irq,
 825                                    irqflags | IRQF_ONESHOT, client->name, ihid);
 826         if (ret < 0) {
 827                 dev_warn(&client->dev,
 828                         "Could not register for %s interrupt, irq = %d,"
 829                         " ret = %d\n",
 830                         client->name, client->irq, ret);
 831
 832                 return ret;
 833         }
 834
 835         return 0;
 836 }
 837
 838 static int i2c_hid_fetch_hid_descriptor(struct i2c_hid *ihid)
 839 {
 840         struct i2c_client *client = ihid->client;
 841         struct i2c_hid_desc *hdesc = &ihid->hdesc;
 842         unsigned int dsize;
 843         int ret;
 844
 845         /* i2c hid fetch using a fixed descriptor size (30 bytes) */
 846         if (i2c_hid_get_dmi_i2c_hid_desc_override(client->name)) {
 847                 i2c_hid_dbg(ihid, "Using a HID descriptor override\n");
 848                 ihid->hdesc =
 849                         *i2c_hid_get_dmi_i2c_hid_desc_override(client->name);
 850         } else {
 851                 i2c_hid_dbg(ihid, "Fetching the HID descriptor\n");
 852                 ret = i2c_hid_command(client, &hid_descr_cmd,
 853                                       ihid->hdesc_buffer,
 854                                       sizeof(struct i2c_hid_desc));
 855                 if (ret) {
 856                         dev_err(&client->dev, "hid_descr_cmd failed\n");
 857                         return -ENODEV;
 858                 }
 859         }
 860
 861         /* Validate the length of HID descriptor, the 4 first bytes:
 862          * bytes 0-1 -> length
 863          * bytes 2-3 -> bcdVersion (has to be 1.00) */
 864         /* check bcdVersion == 1.0 */
 865         if (le16_to_cpu(hdesc->bcdVersion) != 0x0100) {
 866                 dev_err(&client->dev,
 867                         "unexpected HID descriptor bcdVersion (0x%04hx)\n",
 868                         le16_to_cpu(hdesc->bcdVersion));
 869                 return -ENODEV;
 870         }
 871
 872         /* Descriptor length should be 30 bytes as per the specification */
 873         dsize = le16_to_cpu(hdesc->wHIDDescLength);
 874         if (dsize != sizeof(struct i2c_hid_desc)) {
 875                 dev_err(&client->dev, "weird size of HID descriptor (%u)\n",
 876                         dsize);
 877                 return -ENODEV;
 878         }
 879         i2c_hid_dbg(ihid, "HID Descriptor: %*ph\n", dsize, ihid->hdesc_buffer);
 880         return 0;
 881 }
 882
 883 #ifdef CONFIG_ACPI
 884 static const struct acpi_device_id i2c_hid_acpi_blacklist[] = {
 885         /*
 886          * The CHPN0001 ACPI device, which is used to describe the Chipone
 887          * ICN8505 controller, has a _CID of PNP0C50 but is not HID compatible.
 888          */
 889         {"CHPN0001", 0 },
 890         { },
 891 };
 892
 893 static int i2c_hid_acpi_pdata(struct i2c_client *client,
 894                 struct i2c_hid_platform_data *pdata)
 895 {
 896         static guid_t i2c_hid_guid =
 897                 GUID_INIT(0x3CDFF6F7, 0x4267, 0x4555,
 898                           0xAD, 0x05, 0xB3, 0x0A, 0x3D, 0x89, 0x38, 0xDE);
 899         union acpi_object *obj;
 900         struct acpi_device *adev;
 901         acpi_handle handle;
 902
 903         handle = ACPI_HANDLE(&client->dev);
 904         if (!handle || acpi_bus_get_device(handle, &adev)) {
 905                 dev_err(&client->dev, "Error could not get ACPI device\n");
 906                 return -ENODEV;
 907         }
 908
 909         if (acpi_match_device_ids(adev, i2c_hid_acpi_blacklist) == 0)
 910                 return -ENODEV;
 911
 912         obj = acpi_evaluate_dsm_typed(handle, &i2c_hid_guid, 1, 1, NULL,
 913                                       ACPI_TYPE_INTEGER);
 914         if (!obj) {
 915                 dev_err(&client->dev, "Error _DSM call to get HID descriptor address failed\n");
 916                 return -ENODEV;
 917         }
 918
 919         pdata->hid_descriptor_address = obj->integer.value;
 920         ACPI_FREE(obj);
 921
 922         return 0;
 923 }
 924
 925 static void i2c_hid_acpi_fix_up_power(struct device *dev)
 926 {
 927         struct acpi_device *adev;
 928
 929         adev = ACPI_COMPANION(dev);
 930         if (adev)
 931                 acpi_device_fix_up_power(adev);
 932 }
 933
 934 static const struct acpi_device_id i2c_hid_acpi_match[] = {
 935         {"ACPI0C50", 0 },
 936         {"PNP0C50", 0 },
 937         { },
 938 };
 939 MODULE_DEVICE_TABLE(acpi, i2c_hid_acpi_match);
 940 #else
 941 static inline int i2c_hid_acpi_pdata(struct i2c_client *client,
 942                 struct i2c_hid_platform_data *pdata)
 943 {
 944         return -ENODEV;
 945 }
 946
 947 static inline void i2c_hid_acpi_fix_up_power(struct device *dev) {}
 948 #endif
 949
 950 #ifdef CONFIG_OF
 951 static int i2c_hid_of_probe(struct i2c_client *client,
 952                 struct i2c_hid_platform_data *pdata)
 953 {
 954         struct device *dev = &client->dev;
 955         u32 val;
 956         int ret;
 957
 958         ret = of_property_read_u32(dev->of_node, "hid-descr-addr", &val);
 959         if (ret) {
 960                 dev_err(&client->dev, "HID register address not provided\n");
 961                 return -ENODEV;
 962         }
 963         if (val >> 16) {
 964                 dev_err(&client->dev, "Bad HID register address: 0x%08x\n",
 965                         val);
 966                 return -EINVAL;
 967         }
 968         pdata->hid_descriptor_address = val;
 969
 970         return 0;
 971 }
 972
 973 static const struct of_device_id i2c_hid_of_match[] = {
 974         { .compatible = "hid-over-i2c" },
 975         {},
 976 };
 977 MODULE_DEVICE_TABLE(of, i2c_hid_of_match);
 978 #else
 979 static inline int i2c_hid_of_probe(struct i2c_client *client,
 980                 struct i2c_hid_platform_data *pdata)
 981 {
 982         return -ENODEV;
 983 }
 984 #endif
 985
 986 static void i2c_hid_fwnode_probe(struct i2c_client *client,
 987                                  struct i2c_hid_platform_data *pdata)
 988 {
 989         u32 val;
 990
 991         if (!device_property_read_u32(&client->dev, "post-power-on-delay-ms",
 992                                       &val))
 993                 pdata->post_power_delay_ms = val;
 994 }
 995
 996 static int i2c_hid_probe(struct i2c_client *client,
 997                          const struct i2c_device_id *dev_id)
 998 {
 999         int ret;
1000         struct i2c_hid *ihid;
1001         struct hid_device *hid;
1002         __u16 hidRegister;
1003         struct i2c_hid_platform_data *platform_data = client->dev.platform_data;
1004
1005         dbg_hid("HID probe called for i2c 0x%02x\n", client->addr);
1006
1007         if (!client->irq) {
1008                 dev_err(&client->dev,
1009                         "HID over i2c has not been provided an Int IRQ\n");
1010                 return -EINVAL;
1011         }
1012
1013         if (client->irq < 0) {
1014                 if (client->irq != -EPROBE_DEFER)
1015                         dev_err(&client->dev,
1016                                 "HID over i2c doesn't have a valid IRQ\n");
1017                 return client->irq;
1018         }
1019
1020         ihid = devm_kzalloc(&client->dev, sizeof(*ihid), GFP_KERNEL);
1021         if (!ihid)
1022                 return -ENOMEM;
1023
1024         if (client->dev.of_node) {
1025                 ret = i2c_hid_of_probe(client, &ihid->pdata);
1026                 if (ret)
1027                         return ret;
1028         } else if (!platform_data) {
1029                 ret = i2c_hid_acpi_pdata(client, &ihid->pdata);
1030                 if (ret)
1031                         return ret;
1032         } else {
1033                 ihid->pdata = *platform_data;
1034         }
1035
1036         /* Parse platform agnostic common properties from ACPI / device tree */
1037         i2c_hid_fwnode_probe(client, &ihid->pdata);
1038
1039         ihid->pdata.supplies[0].supply = "vdd";
1040         ihid->pdata.supplies[1].supply = "vddl";
1041
1042         ret = devm_regulator_bulk_get(&client->dev,
1043                                       ARRAY_SIZE(ihid->pdata.supplies),
1044                                       ihid->pdata.supplies);
1045         if (ret)
1046                 return ret;
1047
1048         ret = regulator_bulk_enable(ARRAY_SIZE(ihid->pdata.supplies),
1049                                     ihid->pdata.supplies);
1050         if (ret < 0)
1051                 return ret;
1052
1053         if (ihid->pdata.post_power_delay_ms)
1054                 msleep(ihid->pdata.post_power_delay_ms);
1055
1056         i2c_set_clientdata(client, ihid);
1057
1058         ihid->client = client;
1059
1060         hidRegister = ihid->pdata.hid_descriptor_address;
1061         ihid->wHIDDescRegister = cpu_to_le16(hidRegister);
1062
1063         init_waitqueue_head(&ihid->wait);
1064         mutex_init(&ihid->reset_lock);
1065
1066         /* we need to allocate the command buffer without knowing the maximum
1067          * size of the reports. Let's use HID_MIN_BUFFER_SIZE, then we do the
1068          * real computation later. */
1069         ret = i2c_hid_alloc_buffers(ihid, HID_MIN_BUFFER_SIZE);
1070         if (ret < 0)
1071                 goto err_regulator;
1072
1073         i2c_hid_acpi_fix_up_power(&client->dev);
1074
1075         device_enable_async_suspend(&client->dev);
1076
1077         /* Make sure there is something at this address */
1078         ret = i2c_smbus_read_byte(client);
1079         if (ret < 0) {
1080                 dev_dbg(&client->dev, "nothing at this address: %d\n", ret);
1081                 ret = -ENXIO;
1082                 goto err_regulator;
1083         }
1084
1085         ret = i2c_hid_fetch_hid_descriptor(ihid);
1086         if (ret < 0)
1087                 goto err_regulator;
1088
1089         ret = i2c_hid_init_irq(client);
1090         if (ret < 0)
1091                 goto err_regulator;
1092
1093         hid = hid_allocate_device();
1094         if (IS_ERR(hid)) {
1095                 ret = PTR_ERR(hid);
1096                 goto err_irq;
1097         }
1098
1099         ihid->hid = hid;
1100
1101         hid->driver_data = client;
1102         hid->ll_driver = &i2c_hid_ll_driver;
1103         hid->dev.parent = &client->dev;
1104         hid->bus = BUS_I2C;
1105         hid->version = le16_to_cpu(ihid->hdesc.bcdVersion);
1106         hid->vendor = le16_to_cpu(ihid->hdesc.wVendorID);
1107         hid->product = le16_to_cpu(ihid->hdesc.wProductID);
1108
1109         snprintf(hid->name, sizeof(hid->name), "%s %04hX:%04hX",
1110                  client->name, hid->vendor, hid->product);
1111         strlcpy(hid->phys, dev_name(&client->dev), sizeof(hid->phys));
1112
1113         ihid->quirks = i2c_hid_lookup_quirk(hid->vendor, hid->product);
1114
1115         ret = hid_add_device(hid);
1116         if (ret) {
1117                 if (ret != -ENODEV)
1118                         hid_err(client, "can't add hid device: %d\n", ret);
1119                 goto err_mem_free;
1120         }
1121
1122         return 0;
1123
1124 err_mem_free:
1125         hid_destroy_device(hid);
1126
1127 err_irq:
1128         free_irq(client->irq, ihid);
1129
1130 err_regulator:
1131         regulator_bulk_disable(ARRAY_SIZE(ihid->pdata.supplies),
1132                                ihid->pdata.supplies);
1133         i2c_hid_free_buffers(ihid);
1134         return ret;
1135 }
1136
1137 static int i2c_hid_remove(struct i2c_client *client)
1138 {
1139         struct i2c_hid *ihid = i2c_get_clientdata(client);
1140         struct hid_device *hid;
1141
1142         hid = ihid->hid;
1143         hid_destroy_device(hid);
1144
1145         free_irq(client->irq, ihid);
1146
1147         if (ihid->bufsize)
1148                 i2c_hid_free_buffers(ihid);
1149
1150         regulator_bulk_disable(ARRAY_SIZE(ihid->pdata.supplies),
1151                                ihid->pdata.supplies);
1152
1153         return 0;
1154 }
1155
1156 static void i2c_hid_shutdown(struct i2c_client *client)
1157 {
1158         struct i2c_hid *ihid = i2c_get_clientdata(client);
1159
1160         i2c_hid_set_power(client, I2C_HID_PWR_SLEEP);
1161         free_irq(client->irq, ihid);
1162 }
1163
1164 #ifdef CONFIG_PM_SLEEP
1165 static int i2c_hid_suspend(struct device *dev)
1166 {
1167         struct i2c_client *client = to_i2c_client(dev);
1168         struct i2c_hid *ihid = i2c_get_clientdata(client);
1169         struct hid_device *hid = ihid->hid;
1170         int ret;
1171         int wake_status;
1172
1173         if (hid->driver && hid->driver->suspend) {
1174                 ret = hid->driver->suspend(hid, PMSG_SUSPEND);
1175                 if (ret < 0)
1176                         return ret;
1177         }
1178
1179         /* Save some power */
1180         i2c_hid_set_power(client, I2C_HID_PWR_SLEEP);
1181
1182         disable_irq(client->irq);
1183
1184         if (device_may_wakeup(&client->dev)) {
1185                 wake_status = enable_irq_wake(client->irq);
1186                 if (!wake_status)
1187                         ihid->irq_wake_enabled = true;
1188                 else
1189                         hid_warn(hid, "Failed to enable irq wake: %d\n",
1190                                 wake_status);
1191         } else {
1192                 regulator_bulk_disable(ARRAY_SIZE(ihid->pdata.supplies),
1193                                        ihid->pdata.supplies);
1194         }
1195
1196         return 0;
1197 }
1198
1199 static int i2c_hid_resume(struct device *dev)
1200 {
1201         int ret;
1202         struct i2c_client *client = to_i2c_client(dev);
1203         struct i2c_hid *ihid = i2c_get_clientdata(client);
1204         struct hid_device *hid = ihid->hid;
1205         int wake_status;
1206
1207         if (!device_may_wakeup(&client->dev)) {
1208                 ret = regulator_bulk_enable(ARRAY_SIZE(ihid->pdata.supplies),
1209                                             ihid->pdata.supplies);
1210                 if (ret)
1211                         hid_warn(hid, "Failed to enable supplies: %d\n", ret);
1212
1213                 if (ihid->pdata.post_power_delay_ms)
1214                         msleep(ihid->pdata.post_power_delay_ms);
1215         } else if (ihid->irq_wake_enabled) {
1216                 wake_status = disable_irq_wake(client->irq);
1217                 if (!wake_status)
1218                         ihid->irq_wake_enabled = false;
1219                 else
1220                         hid_warn(hid, "Failed to disable irq wake: %d\n",
1221                                 wake_status);
1222         }
1223
1224         enable_irq(client->irq);
1225
1226         /* Instead of resetting device, simply powers the device on. This
1227          * solves "incomplete reports" on Raydium devices 2386:3118 and
1228          * 2386:4B33 and fixes various SIS touchscreens no longer sending
1229          * data after a suspend/resume.
1230          *
1231          * However some ALPS touchpads generate IRQ storm without reset, so
1232          * let's still reset them here.
1233          */
1234         if (ihid->quirks & I2C_HID_QUIRK_RESET_ON_RESUME)
1235                 ret = i2c_hid_hwreset(client);
1236         else
1237                 ret = i2c_hid_set_power(client, I2C_HID_PWR_ON);
1238
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 static const struct dev_pm_ops i2c_hid_pm = {
1252         SET_SYSTEM_SLEEP_PM_OPS(i2c_hid_suspend, i2c_hid_resume)
1253 };
1254
1255 static const struct i2c_device_id i2c_hid_id_table[] = {
1256         { "hid", 0 },
1257         { "hid-over-i2c", 0 },
1258         { },
1259 };
1260 MODULE_DEVICE_TABLE(i2c, i2c_hid_id_table);
1261
1262
1263 static struct i2c_driver i2c_hid_driver = {
1264         .driver = {
1265                 .name   = "i2c_hid",
1266                 .pm     = &i2c_hid_pm,
1267                 .acpi_match_table = ACPI_PTR(i2c_hid_acpi_match),
1268                 .of_match_table = of_match_ptr(i2c_hid_of_match),
1269         },
1270
1271         .probe          = i2c_hid_probe,
1272         .remove         = i2c_hid_remove,
1273         .shutdown       = i2c_hid_shutdown,
1274         .id_table       = i2c_hid_id_table,
1275 };
1276
1277 module_i2c_driver(i2c_hid_driver);
1278
1279 MODULE_DESCRIPTION("HID over I2C core driver");
1280 MODULE_AUTHOR("Benjamin Tissoires <benjamin.tissoires@gmail.com>");
1281 MODULE_LICENSE("GPL");