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 #define I2C_HID_QUIRK_NO_WAKEUP_AFTER_RESET     BIT(7)
  54
  55
  56 /* flags */
  57 #define I2C_HID_STARTED         0
  58 #define I2C_HID_RESET_PENDING   1
  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_ITE, I2C_DEVICE_ID_ITE_VOYO_WINPAD_A15,
 175                 I2C_HID_QUIRK_NO_IRQ_AFTER_RESET },
 176         { I2C_VENDOR_ID_RAYDIUM, I2C_PRODUCT_ID_RAYDIUM_3118,
 177                 I2C_HID_QUIRK_NO_IRQ_AFTER_RESET },
 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         /*
 185          * Sending the wakeup after reset actually break ELAN touchscreen controller
 186          */
 187         { USB_VENDOR_ID_ELAN, HID_ANY_ID,
 188                  I2C_HID_QUIRK_NO_WAKEUP_AFTER_RESET |
 189                  I2C_HID_QUIRK_BOGUS_IRQ },
 190         { 0, 0 }
 191 };
 192
 193 /*
 194  * i2c_hid_lookup_quirk: return any quirks associated with a I2C HID device
 195  * @idVendor: the 16-bit vendor ID
 196  * @idProduct: the 16-bit product ID
 197  *
 198  * Returns: a u32 quirks value.
 199  */
 200 static u32 i2c_hid_lookup_quirk(const u16 idVendor, const u16 idProduct)
 201 {
 202         u32 quirks = 0;
 203         int n;
 204
 205         for (n = 0; i2c_hid_quirks[n].idVendor; n++)
 206                 if (i2c_hid_quirks[n].idVendor == idVendor &&
 207                     (i2c_hid_quirks[n].idProduct == (__u16)HID_ANY_ID ||
 208                      i2c_hid_quirks[n].idProduct == idProduct))
 209                         quirks = i2c_hid_quirks[n].quirks;
 210
 211         return quirks;
 212 }
 213
 214 static int __i2c_hid_command(struct i2c_client *client,
 215                 const struct i2c_hid_cmd *command, u8 reportID,
 216                 u8 reportType, u8 *args, int args_len,
 217                 unsigned char *buf_recv, int data_len)
 218 {
 219         struct i2c_hid *ihid = i2c_get_clientdata(client);
 220         union command *cmd = (union command *)ihid->cmdbuf;
 221         int ret;
 222         struct i2c_msg msg[2];
 223         int msg_num = 1;
 224
 225         int length = command->length;
 226         bool wait = command->wait;
 227         unsigned int registerIndex = command->registerIndex;
 228
 229         /* special case for hid_descr_cmd */
 230         if (command == &hid_descr_cmd) {
 231                 cmd->c.reg = ihid->wHIDDescRegister;
 232         } else {
 233                 cmd->data[0] = ihid->hdesc_buffer[registerIndex];
 234                 cmd->data[1] = ihid->hdesc_buffer[registerIndex + 1];
 235         }
 236
 237         if (length > 2) {
 238                 cmd->c.opcode = command->opcode;
 239                 cmd->c.reportTypeID = reportID | reportType << 4;
 240         }
 241
 242         memcpy(cmd->data + length, args, args_len);
 243         length += args_len;
 244
 245         i2c_hid_dbg(ihid, "%s: cmd=%*ph\n", __func__, length, cmd->data);
 246
 247         msg[0].addr = client->addr;
 248         msg[0].flags = client->flags & I2C_M_TEN;
 249         msg[0].len = length;
 250         msg[0].buf = cmd->data;
 251         if (data_len > 0) {
 252                 msg[1].addr = client->addr;
 253                 msg[1].flags = client->flags & I2C_M_TEN;
 254                 msg[1].flags |= I2C_M_RD;
 255                 msg[1].len = data_len;
 256                 msg[1].buf = buf_recv;
 257                 msg_num = 2;
 258         }
 259
 260         if (wait)
 261                 set_bit(I2C_HID_RESET_PENDING, &ihid->flags);
 262
 263         ret = i2c_transfer(client->adapter, msg, msg_num);
 264
 265         if (ret != msg_num)
 266                 return ret < 0 ? ret : -EIO;
 267
 268         ret = 0;
 269
 270         if (wait && (ihid->quirks & I2C_HID_QUIRK_NO_IRQ_AFTER_RESET)) {
 271                 msleep(100);
 272         } else if (wait) {
 273                 i2c_hid_dbg(ihid, "%s: waiting...\n", __func__);
 274                 if (!wait_event_timeout(ihid->wait,
 275                                 !test_bit(I2C_HID_RESET_PENDING, &ihid->flags),
 276                                 msecs_to_jiffies(5000)))
 277                         ret = -ENODATA;
 278                 i2c_hid_dbg(ihid, "%s: finished.\n", __func__);
 279         }
 280
 281         return ret;
 282 }
 283
 284 static int i2c_hid_command(struct i2c_client *client,
 285                 const struct i2c_hid_cmd *command,
 286                 unsigned char *buf_recv, int data_len)
 287 {
 288         return __i2c_hid_command(client, command, 0, 0, NULL, 0,
 289                                 buf_recv, data_len);
 290 }
 291
 292 static int i2c_hid_get_report(struct i2c_client *client, u8 reportType,
 293                 u8 reportID, unsigned char *buf_recv, int data_len)
 294 {
 295         struct i2c_hid *ihid = i2c_get_clientdata(client);
 296         u8 args[3];
 297         int ret;
 298         int args_len = 0;
 299         u16 readRegister = le16_to_cpu(ihid->hdesc.wDataRegister);
 300
 301         i2c_hid_dbg(ihid, "%s\n", __func__);
 302
 303         if (reportID >= 0x0F) {
 304                 args[args_len++] = reportID;
 305                 reportID = 0x0F;
 306         }
 307
 308         args[args_len++] = readRegister & 0xFF;
 309         args[args_len++] = readRegister >> 8;
 310
 311         ret = __i2c_hid_command(client, &hid_get_report_cmd, reportID,
 312                 reportType, args, args_len, buf_recv, data_len);
 313         if (ret) {
 314                 dev_err(&client->dev,
 315                         "failed to retrieve report from device.\n");
 316                 return ret;
 317         }
 318
 319         return 0;
 320 }
 321
 322 /**
 323  * i2c_hid_set_or_send_report: forward an incoming report to the device
 324  * @client: the i2c_client of the device
 325  * @reportType: 0x03 for HID_FEATURE_REPORT ; 0x02 for HID_OUTPUT_REPORT
 326  * @reportID: the report ID
 327  * @buf: the actual data to transfer, without the report ID
 328  * @data_len: size of buf
 329  * @use_data: true: use SET_REPORT HID command, false: send plain OUTPUT report
 330  */
 331 static int i2c_hid_set_or_send_report(struct i2c_client *client, u8 reportType,
 332                 u8 reportID, unsigned char *buf, size_t data_len, bool use_data)
 333 {
 334         struct i2c_hid *ihid = i2c_get_clientdata(client);
 335         u8 *args = ihid->argsbuf;
 336         const struct i2c_hid_cmd *hidcmd;
 337         int ret;
 338         u16 dataRegister = le16_to_cpu(ihid->hdesc.wDataRegister);
 339         u16 outputRegister = le16_to_cpu(ihid->hdesc.wOutputRegister);
 340         u16 maxOutputLength = le16_to_cpu(ihid->hdesc.wMaxOutputLength);
 341         u16 size;
 342         int args_len;
 343         int index = 0;
 344
 345         i2c_hid_dbg(ihid, "%s\n", __func__);
 346
 347         if (data_len > ihid->bufsize)
 348                 return -EINVAL;
 349
 350         size =          2                       /* size */ +
 351                         (reportID ? 1 : 0)      /* reportID */ +
 352                         data_len                /* buf */;
 353         args_len =      (reportID >= 0x0F ? 1 : 0) /* optional third byte */ +
 354                         2                       /* dataRegister */ +
 355                         size                    /* args */;
 356
 357         if (!use_data && maxOutputLength == 0)
 358                 return -ENOSYS;
 359
 360         if (reportID >= 0x0F) {
 361                 args[index++] = reportID;
 362                 reportID = 0x0F;
 363         }
 364
 365         /*
 366          * use the data register for feature reports or if the device does not
 367          * support the output register
 368          */
 369         if (use_data) {
 370                 args[index++] = dataRegister & 0xFF;
 371                 args[index++] = dataRegister >> 8;
 372                 hidcmd = &hid_set_report_cmd;
 373         } else {
 374                 args[index++] = outputRegister & 0xFF;
 375                 args[index++] = outputRegister >> 8;
 376                 hidcmd = &hid_no_cmd;
 377         }
 378
 379         args[index++] = size & 0xFF;
 380         args[index++] = size >> 8;
 381
 382         if (reportID)
 383                 args[index++] = reportID;
 384
 385         memcpy(&args[index], buf, data_len);
 386
 387         ret = __i2c_hid_command(client, hidcmd, reportID,
 388                 reportType, args, args_len, NULL, 0);
 389         if (ret) {
 390                 dev_err(&client->dev, "failed to set a report to device.\n");
 391                 return ret;
 392         }
 393
 394         return data_len;
 395 }
 396
 397 static int i2c_hid_set_power(struct i2c_client *client, int power_state)
 398 {
 399         struct i2c_hid *ihid = i2c_get_clientdata(client);
 400         int ret;
 401
 402         i2c_hid_dbg(ihid, "%s\n", __func__);
 403
 404         /*
 405          * Some devices require to send a command to wakeup before power on.
 406          * The call will get a return value (EREMOTEIO) but device will be
 407          * triggered and activated. After that, it goes like a normal device.
 408          */
 409         if (power_state == I2C_HID_PWR_ON &&
 410             ihid->quirks & I2C_HID_QUIRK_SET_PWR_WAKEUP_DEV) {
 411                 ret = i2c_hid_command(client, &hid_set_power_cmd, NULL, 0);
 412
 413                 /* Device was already activated */
 414                 if (!ret)
 415                         goto set_pwr_exit;
 416         }
 417
 418         ret = __i2c_hid_command(client, &hid_set_power_cmd, power_state,
 419                 0, NULL, 0, NULL, 0);
 420
 421         if (ret)
 422                 dev_err(&client->dev, "failed to change power setting.\n");
 423
 424 set_pwr_exit:
 425
 426         /*
 427          * The HID over I2C specification states that if a DEVICE needs time
 428          * after the PWR_ON request, it should utilise CLOCK stretching.
 429          * However, it has been observered that the Windows driver provides a
 430          * 1ms sleep between the PWR_ON and RESET requests.
 431          * According to Goodix Windows even waits 60 ms after (other?)
 432          * PWR_ON requests. Testing has confirmed that several devices
 433          * will not work properly without a delay after a PWR_ON request.
 434          */
 435         if (!ret && power_state == I2C_HID_PWR_ON)
 436                 msleep(60);
 437
 438         return ret;
 439 }
 440
 441 static int i2c_hid_hwreset(struct i2c_client *client)
 442 {
 443         struct i2c_hid *ihid = i2c_get_clientdata(client);
 444         int ret;
 445
 446         i2c_hid_dbg(ihid, "%s\n", __func__);
 447
 448         /*
 449          * This prevents sending feature reports while the device is
 450          * being reset. Otherwise we may lose the reset complete
 451          * interrupt.
 452          */
 453         mutex_lock(&ihid->reset_lock);
 454
 455         ret = i2c_hid_set_power(client, I2C_HID_PWR_ON);
 456         if (ret)
 457                 goto out_unlock;
 458
 459         i2c_hid_dbg(ihid, "resetting...\n");
 460
 461         ret = i2c_hid_command(client, &hid_reset_cmd, NULL, 0);
 462         if (ret) {
 463                 dev_err(&client->dev, "failed to reset device.\n");
 464                 i2c_hid_set_power(client, I2C_HID_PWR_SLEEP);
 465                 goto out_unlock;
 466         }
 467
 468         /* At least some SIS devices need this after reset */
 469         if (!(ihid->quirks & I2C_HID_QUIRK_NO_WAKEUP_AFTER_RESET))
 470                 ret = i2c_hid_set_power(client, I2C_HID_PWR_ON);
 471
 472 out_unlock:
 473         mutex_unlock(&ihid->reset_lock);
 474         return ret;
 475 }
 476
 477 static void i2c_hid_get_input(struct i2c_hid *ihid)
 478 {
 479         int ret;
 480         u32 ret_size;
 481         int size = le16_to_cpu(ihid->hdesc.wMaxInputLength);
 482
 483         if (size > ihid->bufsize)
 484                 size = ihid->bufsize;
 485
 486         ret = i2c_master_recv(ihid->client, ihid->inbuf, size);
 487         if (ret != size) {
 488                 if (ret < 0)
 489                         return;
 490
 491                 dev_err(&ihid->client->dev, "%s: got %d data instead of %d\n",
 492                         __func__, ret, size);
 493                 return;
 494         }
 495
 496         ret_size = ihid->inbuf[0] | ihid->inbuf[1] << 8;
 497
 498         if (!ret_size) {
 499                 /* host or device initiated RESET completed */
 500                 if (test_and_clear_bit(I2C_HID_RESET_PENDING, &ihid->flags))
 501                         wake_up(&ihid->wait);
 502                 return;
 503         }
 504
 505         if (ihid->quirks & I2C_HID_QUIRK_BOGUS_IRQ && ret_size == 0xffff) {
 506                 dev_warn_once(&ihid->client->dev, "%s: IRQ triggered but "
 507                               "there's no data\n", __func__);
 508                 return;
 509         }
 510
 511         if ((ret_size > size) || (ret_size < 2)) {
 512                 if (ihid->quirks & I2C_HID_QUIRK_BAD_INPUT_SIZE) {
 513                         ihid->inbuf[0] = size & 0xff;
 514                         ihid->inbuf[1] = size >> 8;
 515                         ret_size = size;
 516                 } else {
 517                         dev_err(&ihid->client->dev, "%s: incomplete report (%d/%d)\n",
 518                                 __func__, size, ret_size);
 519                         return;
 520                 }
 521         }
 522
 523         i2c_hid_dbg(ihid, "input: %*ph\n", ret_size, ihid->inbuf);
 524
 525         if (test_bit(I2C_HID_STARTED, &ihid->flags))
 526                 hid_input_report(ihid->hid, HID_INPUT_REPORT, ihid->inbuf + 2,
 527                                 ret_size - 2, 1);
 528
 529         return;
 530 }
 531
 532 static irqreturn_t i2c_hid_irq(int irq, void *dev_id)
 533 {
 534         struct i2c_hid *ihid = dev_id;
 535
 536         i2c_hid_get_input(ihid);
 537
 538         return IRQ_HANDLED;
 539 }
 540
 541 static int i2c_hid_get_report_length(struct hid_report *report)
 542 {
 543         return ((report->size - 1) >> 3) + 1 +
 544                 report->device->report_enum[report->type].numbered + 2;
 545 }
 546
 547 /*
 548  * Traverse the supplied list of reports and find the longest
 549  */
 550 static void i2c_hid_find_max_report(struct hid_device *hid, unsigned int type,
 551                 unsigned int *max)
 552 {
 553         struct hid_report *report;
 554         unsigned int size;
 555
 556         /* We should not rely on wMaxInputLength, as some devices may set it to
 557          * a wrong length. */
 558         list_for_each_entry(report, &hid->report_enum[type].report_list, list) {
 559                 size = i2c_hid_get_report_length(report);
 560                 if (*max < size)
 561                         *max = size;
 562         }
 563 }
 564
 565 static void i2c_hid_free_buffers(struct i2c_hid *ihid)
 566 {
 567         kfree(ihid->inbuf);
 568         kfree(ihid->rawbuf);
 569         kfree(ihid->argsbuf);
 570         kfree(ihid->cmdbuf);
 571         ihid->inbuf = NULL;
 572         ihid->rawbuf = NULL;
 573         ihid->cmdbuf = NULL;
 574         ihid->argsbuf = NULL;
 575         ihid->bufsize = 0;
 576 }
 577
 578 static int i2c_hid_alloc_buffers(struct i2c_hid *ihid, size_t report_size)
 579 {
 580         /* the worst case is computed from the set_report command with a
 581          * reportID > 15 and the maximum report length */
 582         int args_len = sizeof(__u8) + /* ReportID */
 583                        sizeof(__u8) + /* optional ReportID byte */
 584                        sizeof(__u16) + /* data register */
 585                        sizeof(__u16) + /* size of the report */
 586                        report_size; /* report */
 587
 588         ihid->inbuf = kzalloc(report_size, GFP_KERNEL);
 589         ihid->rawbuf = kzalloc(report_size, GFP_KERNEL);
 590         ihid->argsbuf = kzalloc(args_len, GFP_KERNEL);
 591         ihid->cmdbuf = kzalloc(sizeof(union command) + args_len, GFP_KERNEL);
 592
 593         if (!ihid->inbuf || !ihid->rawbuf || !ihid->argsbuf || !ihid->cmdbuf) {
 594                 i2c_hid_free_buffers(ihid);
 595                 return -ENOMEM;
 596         }
 597
 598         ihid->bufsize = report_size;
 599
 600         return 0;
 601 }
 602
 603 static int i2c_hid_get_raw_report(struct hid_device *hid,
 604                 unsigned char report_number, __u8 *buf, size_t count,
 605                 unsigned char report_type)
 606 {
 607         struct i2c_client *client = hid->driver_data;
 608         struct i2c_hid *ihid = i2c_get_clientdata(client);
 609         size_t ret_count, ask_count;
 610         int ret;
 611
 612         if (report_type == HID_OUTPUT_REPORT)
 613                 return -EINVAL;
 614
 615         /*
 616          * In case of unnumbered reports the response from the device will
 617          * not have the report ID that the upper layers expect, so we need
 618          * to stash it the buffer ourselves and adjust the data size.
 619          */
 620         if (!report_number) {
 621                 buf[0] = 0;
 622                 buf++;
 623                 count--;
 624         }
 625
 626         /* +2 bytes to include the size of the reply in the query buffer */
 627         ask_count = min(count + 2, (size_t)ihid->bufsize);
 628
 629         ret = i2c_hid_get_report(client,
 630                         report_type == HID_FEATURE_REPORT ? 0x03 : 0x01,
 631                         report_number, ihid->rawbuf, ask_count);
 632
 633         if (ret < 0)
 634                 return ret;
 635
 636         ret_count = ihid->rawbuf[0] | (ihid->rawbuf[1] << 8);
 637
 638         if (ret_count <= 2)
 639                 return 0;
 640
 641         ret_count = min(ret_count, ask_count);
 642
 643         /* The query buffer contains the size, dropping it in the reply */
 644         count = min(count, ret_count - 2);
 645         memcpy(buf, ihid->rawbuf + 2, count);
 646
 647         if (!report_number)
 648                 count++;
 649
 650         return count;
 651 }
 652
 653 static int i2c_hid_output_raw_report(struct hid_device *hid, __u8 *buf,
 654                 size_t count, unsigned char report_type, bool use_data)
 655 {
 656         struct i2c_client *client = hid->driver_data;
 657         struct i2c_hid *ihid = i2c_get_clientdata(client);
 658         int report_id = buf[0];
 659         int ret;
 660
 661         if (report_type == HID_INPUT_REPORT)
 662                 return -EINVAL;
 663
 664         mutex_lock(&ihid->reset_lock);
 665
 666         /*
 667          * Note that both numbered and unnumbered reports passed here
 668          * are supposed to have report ID stored in the 1st byte of the
 669          * buffer, so we strip it off unconditionally before passing payload
 670          * to i2c_hid_set_or_send_report which takes care of encoding
 671          * everything properly.
 672          */
 673         ret = i2c_hid_set_or_send_report(client,
 674                                 report_type == HID_FEATURE_REPORT ? 0x03 : 0x02,
 675                                 report_id, buf + 1, count - 1, use_data);
 676
 677         if (ret >= 0)
 678                 ret++; /* add report_id to the number of transferred bytes */
 679
 680         mutex_unlock(&ihid->reset_lock);
 681
 682         return ret;
 683 }
 684
 685 static int i2c_hid_output_report(struct hid_device *hid, __u8 *buf,
 686                 size_t count)
 687 {
 688         return i2c_hid_output_raw_report(hid, buf, count, HID_OUTPUT_REPORT,
 689                         false);
 690 }
 691
 692 static int i2c_hid_raw_request(struct hid_device *hid, unsigned char reportnum,
 693                                __u8 *buf, size_t len, unsigned char rtype,
 694                                int reqtype)
 695 {
 696         switch (reqtype) {
 697         case HID_REQ_GET_REPORT:
 698                 return i2c_hid_get_raw_report(hid, reportnum, buf, len, rtype);
 699         case HID_REQ_SET_REPORT:
 700                 if (buf[0] != reportnum)
 701                         return -EINVAL;
 702                 return i2c_hid_output_raw_report(hid, buf, len, rtype, true);
 703         default:
 704                 return -EIO;
 705         }
 706 }
 707
 708 static int i2c_hid_parse(struct hid_device *hid)
 709 {
 710         struct i2c_client *client = hid->driver_data;
 711         struct i2c_hid *ihid = i2c_get_clientdata(client);
 712         struct i2c_hid_desc *hdesc = &ihid->hdesc;
 713         unsigned int rsize;
 714         char *rdesc;
 715         int ret;
 716         int tries = 3;
 717         char *use_override;
 718
 719         i2c_hid_dbg(ihid, "entering %s\n", __func__);
 720
 721         rsize = le16_to_cpu(hdesc->wReportDescLength);
 722         if (!rsize || rsize > HID_MAX_DESCRIPTOR_SIZE) {
 723                 dbg_hid("weird size of report descriptor (%u)\n", rsize);
 724                 return -EINVAL;
 725         }
 726
 727         do {
 728                 ret = i2c_hid_hwreset(client);
 729                 if (ret)
 730                         msleep(1000);
 731         } while (tries-- > 0 && ret);
 732
 733         if (ret)
 734                 return ret;
 735
 736         use_override = i2c_hid_get_dmi_hid_report_desc_override(client->name,
 737                                                                 &rsize);
 738
 739         if (use_override) {
 740                 rdesc = use_override;
 741                 i2c_hid_dbg(ihid, "Using a HID report descriptor override\n");
 742         } else {
 743                 rdesc = kzalloc(rsize, GFP_KERNEL);
 744
 745                 if (!rdesc) {
 746                         dbg_hid("couldn't allocate rdesc memory\n");
 747                         return -ENOMEM;
 748                 }
 749
 750                 i2c_hid_dbg(ihid, "asking HID report descriptor\n");
 751
 752                 ret = i2c_hid_command(client, &hid_report_descr_cmd,
 753                                       rdesc, rsize);
 754                 if (ret) {
 755                         hid_err(hid, "reading report descriptor failed\n");
 756                         kfree(rdesc);
 757                         return -EIO;
 758                 }
 759         }
 760
 761         i2c_hid_dbg(ihid, "Report Descriptor: %*ph\n", rsize, rdesc);
 762
 763         ret = hid_parse_report(hid, rdesc, rsize);
 764         if (!use_override)
 765                 kfree(rdesc);
 766
 767         if (ret) {
 768                 dbg_hid("parsing report descriptor failed\n");
 769                 return ret;
 770         }
 771
 772         return 0;
 773 }
 774
 775 static int i2c_hid_start(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;
 780         unsigned int bufsize = HID_MIN_BUFFER_SIZE;
 781
 782         i2c_hid_find_max_report(hid, HID_INPUT_REPORT, &bufsize);
 783         i2c_hid_find_max_report(hid, HID_OUTPUT_REPORT, &bufsize);
 784         i2c_hid_find_max_report(hid, HID_FEATURE_REPORT, &bufsize);
 785
 786         if (bufsize > ihid->bufsize) {
 787                 disable_irq(client->irq);
 788                 i2c_hid_free_buffers(ihid);
 789
 790                 ret = i2c_hid_alloc_buffers(ihid, bufsize);
 791                 enable_irq(client->irq);
 792
 793                 if (ret)
 794                         return ret;
 795         }
 796
 797         return 0;
 798 }
 799
 800 static void i2c_hid_stop(struct hid_device *hid)
 801 {
 802         hid->claimed = 0;
 803 }
 804
 805 static int i2c_hid_open(struct hid_device *hid)
 806 {
 807         struct i2c_client *client = hid->driver_data;
 808         struct i2c_hid *ihid = i2c_get_clientdata(client);
 809
 810         set_bit(I2C_HID_STARTED, &ihid->flags);
 811         return 0;
 812 }
 813
 814 static void i2c_hid_close(struct hid_device *hid)
 815 {
 816         struct i2c_client *client = hid->driver_data;
 817         struct i2c_hid *ihid = i2c_get_clientdata(client);
 818
 819         clear_bit(I2C_HID_STARTED, &ihid->flags);
 820 }
 821
 822 struct hid_ll_driver i2c_hid_ll_driver = {
 823         .parse = i2c_hid_parse,
 824         .start = i2c_hid_start,
 825         .stop = i2c_hid_stop,
 826         .open = i2c_hid_open,
 827         .close = i2c_hid_close,
 828         .output_report = i2c_hid_output_report,
 829         .raw_request = i2c_hid_raw_request,
 830 };
 831 EXPORT_SYMBOL_GPL(i2c_hid_ll_driver);
 832
 833 static int i2c_hid_init_irq(struct i2c_client *client)
 834 {
 835         struct i2c_hid *ihid = i2c_get_clientdata(client);
 836         unsigned long irqflags = 0;
 837         int ret;
 838
 839         dev_dbg(&client->dev, "Requesting IRQ: %d\n", client->irq);
 840
 841         if (!irq_get_trigger_type(client->irq))
 842                 irqflags = IRQF_TRIGGER_LOW;
 843
 844         ret = request_threaded_irq(client->irq, NULL, i2c_hid_irq,
 845                                    irqflags | IRQF_ONESHOT, client->name, ihid);
 846         if (ret < 0) {
 847                 dev_warn(&client->dev,
 848                         "Could not register for %s interrupt, irq = %d,"
 849                         " ret = %d\n",
 850                         client->name, client->irq, ret);
 851
 852                 return ret;
 853         }
 854
 855         return 0;
 856 }
 857
 858 static int i2c_hid_fetch_hid_descriptor(struct i2c_hid *ihid)
 859 {
 860         struct i2c_client *client = ihid->client;
 861         struct i2c_hid_desc *hdesc = &ihid->hdesc;
 862         unsigned int dsize;
 863         int ret;
 864
 865         /* i2c hid fetch using a fixed descriptor size (30 bytes) */
 866         if (i2c_hid_get_dmi_i2c_hid_desc_override(client->name)) {
 867                 i2c_hid_dbg(ihid, "Using a HID descriptor override\n");
 868                 ihid->hdesc =
 869                         *i2c_hid_get_dmi_i2c_hid_desc_override(client->name);
 870         } else {
 871                 i2c_hid_dbg(ihid, "Fetching the HID descriptor\n");
 872                 ret = i2c_hid_command(client, &hid_descr_cmd,
 873                                       ihid->hdesc_buffer,
 874                                       sizeof(struct i2c_hid_desc));
 875                 if (ret) {
 876                         dev_err(&client->dev, "hid_descr_cmd failed\n");
 877                         return -ENODEV;
 878                 }
 879         }
 880
 881         /* Validate the length of HID descriptor, the 4 first bytes:
 882          * bytes 0-1 -> length
 883          * bytes 2-3 -> bcdVersion (has to be 1.00) */
 884         /* check bcdVersion == 1.0 */
 885         if (le16_to_cpu(hdesc->bcdVersion) != 0x0100) {
 886                 dev_err(&client->dev,
 887                         "unexpected HID descriptor bcdVersion (0x%04hx)\n",
 888                         le16_to_cpu(hdesc->bcdVersion));
 889                 return -ENODEV;
 890         }
 891
 892         /* Descriptor length should be 30 bytes as per the specification */
 893         dsize = le16_to_cpu(hdesc->wHIDDescLength);
 894         if (dsize != sizeof(struct i2c_hid_desc)) {
 895                 dev_err(&client->dev, "weird size of HID descriptor (%u)\n",
 896                         dsize);
 897                 return -ENODEV;
 898         }
 899         i2c_hid_dbg(ihid, "HID Descriptor: %*ph\n", dsize, ihid->hdesc_buffer);
 900         return 0;
 901 }
 902
 903 #ifdef CONFIG_ACPI
 904 static const struct acpi_device_id i2c_hid_acpi_blacklist[] = {
 905         /*
 906          * The CHPN0001 ACPI device, which is used to describe the Chipone
 907          * ICN8505 controller, has a _CID of PNP0C50 but is not HID compatible.
 908          */
 909         {"CHPN0001", 0 },
 910         { },
 911 };
 912
 913 static int i2c_hid_acpi_pdata(struct i2c_client *client,
 914                 struct i2c_hid_platform_data *pdata)
 915 {
 916         static guid_t i2c_hid_guid =
 917                 GUID_INIT(0x3CDFF6F7, 0x4267, 0x4555,
 918                           0xAD, 0x05, 0xB3, 0x0A, 0x3D, 0x89, 0x38, 0xDE);
 919         union acpi_object *obj;
 920         struct acpi_device *adev;
 921         acpi_handle handle;
 922
 923         handle = ACPI_HANDLE(&client->dev);
 924         if (!handle || acpi_bus_get_device(handle, &adev)) {
 925                 dev_err(&client->dev, "Error could not get ACPI device\n");
 926                 return -ENODEV;
 927         }
 928
 929         if (acpi_match_device_ids(adev, i2c_hid_acpi_blacklist) == 0)
 930                 return -ENODEV;
 931
 932         obj = acpi_evaluate_dsm_typed(handle, &i2c_hid_guid, 1, 1, NULL,
 933                                       ACPI_TYPE_INTEGER);
 934         if (!obj) {
 935                 dev_err(&client->dev, "Error _DSM call to get HID descriptor address failed\n");
 936                 return -ENODEV;
 937         }
 938
 939         pdata->hid_descriptor_address = obj->integer.value;
 940         ACPI_FREE(obj);
 941
 942         return 0;
 943 }
 944
 945 static void i2c_hid_acpi_fix_up_power(struct device *dev)
 946 {
 947         struct acpi_device *adev;
 948
 949         adev = ACPI_COMPANION(dev);
 950         if (adev)
 951                 acpi_device_fix_up_power(adev);
 952 }
 953
 954 static void i2c_hid_acpi_enable_wakeup(struct device *dev)
 955 {
 956         if (acpi_gbl_FADT.flags & ACPI_FADT_LOW_POWER_S0) {
 957                 device_set_wakeup_capable(dev, true);
 958                 device_set_wakeup_enable(dev, false);
 959         }
 960 }
 961
 962 static void i2c_hid_acpi_shutdown(struct device *dev)
 963 {
 964         acpi_device_set_power(ACPI_COMPANION(dev), ACPI_STATE_D3_COLD);
 965 }
 966
 967 static const struct acpi_device_id i2c_hid_acpi_match[] = {
 968         {"ACPI0C50", 0 },
 969         {"PNP0C50", 0 },
 970         { },
 971 };
 972 MODULE_DEVICE_TABLE(acpi, i2c_hid_acpi_match);
 973 #else
 974 static inline int i2c_hid_acpi_pdata(struct i2c_client *client,
 975                 struct i2c_hid_platform_data *pdata)
 976 {
 977         return -ENODEV;
 978 }
 979
 980 static inline void i2c_hid_acpi_fix_up_power(struct device *dev) {}
 981
 982 static inline void i2c_hid_acpi_enable_wakeup(struct device *dev) {}
 983
 984 static inline void i2c_hid_acpi_shutdown(struct device *dev) {}
 985 #endif
 986
 987 #ifdef CONFIG_OF
 988 static int i2c_hid_of_probe(struct i2c_client *client,
 989                 struct i2c_hid_platform_data *pdata)
 990 {
 991         struct device *dev = &client->dev;
 992         u32 val;
 993         int ret;
 994
 995         ret = of_property_read_u32(dev->of_node, "hid-descr-addr", &val);
 996         if (ret) {
 997                 dev_err(&client->dev, "HID register address not provided\n");
 998                 return -ENODEV;
 999         }
1000         if (val >> 16) {
1001                 dev_err(&client->dev, "Bad HID register address: 0x%08x\n",
1002                         val);
1003                 return -EINVAL;
1004         }
1005         pdata->hid_descriptor_address = val;
1006
1007         return 0;
1008 }
1009
1010 static const struct of_device_id i2c_hid_of_match[] = {
1011         { .compatible = "hid-over-i2c" },
1012         {},
1013 };
1014 MODULE_DEVICE_TABLE(of, i2c_hid_of_match);
1015 #else
1016 static inline int i2c_hid_of_probe(struct i2c_client *client,
1017                 struct i2c_hid_platform_data *pdata)
1018 {
1019         return -ENODEV;
1020 }
1021 #endif
1022
1023 static void i2c_hid_fwnode_probe(struct i2c_client *client,
1024                                  struct i2c_hid_platform_data *pdata)
1025 {
1026         u32 val;
1027
1028         if (!device_property_read_u32(&client->dev, "post-power-on-delay-ms",
1029                                       &val))
1030                 pdata->post_power_delay_ms = val;
1031 }
1032
1033 static int i2c_hid_probe(struct i2c_client *client,
1034                          const struct i2c_device_id *dev_id)
1035 {
1036         int ret;
1037         struct i2c_hid *ihid;
1038         struct hid_device *hid;
1039         __u16 hidRegister;
1040         struct i2c_hid_platform_data *platform_data = client->dev.platform_data;
1041
1042         dbg_hid("HID probe called for i2c 0x%02x\n", client->addr);
1043
1044         if (!client->irq) {
1045                 dev_err(&client->dev,
1046                         "HID over i2c has not been provided an Int IRQ\n");
1047                 return -EINVAL;
1048         }
1049
1050         if (client->irq < 0) {
1051                 if (client->irq != -EPROBE_DEFER)
1052                         dev_err(&client->dev,
1053                                 "HID over i2c doesn't have a valid IRQ\n");
1054                 return client->irq;
1055         }
1056
1057         ihid = devm_kzalloc(&client->dev, sizeof(*ihid), GFP_KERNEL);
1058         if (!ihid)
1059                 return -ENOMEM;
1060
1061         if (client->dev.of_node) {
1062                 ret = i2c_hid_of_probe(client, &ihid->pdata);
1063                 if (ret)
1064                         return ret;
1065         } else if (!platform_data) {
1066                 ret = i2c_hid_acpi_pdata(client, &ihid->pdata);
1067                 if (ret)
1068                         return ret;
1069         } else {
1070                 ihid->pdata = *platform_data;
1071         }
1072
1073         /* Parse platform agnostic common properties from ACPI / device tree */
1074         i2c_hid_fwnode_probe(client, &ihid->pdata);
1075
1076         ihid->pdata.supplies[0].supply = "vdd";
1077         ihid->pdata.supplies[1].supply = "vddl";
1078
1079         ret = devm_regulator_bulk_get(&client->dev,
1080                                       ARRAY_SIZE(ihid->pdata.supplies),
1081                                       ihid->pdata.supplies);
1082         if (ret)
1083                 return ret;
1084
1085         ret = regulator_bulk_enable(ARRAY_SIZE(ihid->pdata.supplies),
1086                                     ihid->pdata.supplies);
1087         if (ret < 0)
1088                 return ret;
1089
1090         if (ihid->pdata.post_power_delay_ms)
1091                 msleep(ihid->pdata.post_power_delay_ms);
1092
1093         i2c_set_clientdata(client, ihid);
1094
1095         ihid->client = client;
1096
1097         hidRegister = ihid->pdata.hid_descriptor_address;
1098         ihid->wHIDDescRegister = cpu_to_le16(hidRegister);
1099
1100         init_waitqueue_head(&ihid->wait);
1101         mutex_init(&ihid->reset_lock);
1102
1103         /* we need to allocate the command buffer without knowing the maximum
1104          * size of the reports. Let's use HID_MIN_BUFFER_SIZE, then we do the
1105          * real computation later. */
1106         ret = i2c_hid_alloc_buffers(ihid, HID_MIN_BUFFER_SIZE);
1107         if (ret < 0)
1108                 goto err_regulator;
1109
1110         i2c_hid_acpi_fix_up_power(&client->dev);
1111
1112         i2c_hid_acpi_enable_wakeup(&client->dev);
1113
1114         device_enable_async_suspend(&client->dev);
1115
1116         /* Make sure there is something at this address */
1117         ret = i2c_smbus_read_byte(client);
1118         if (ret < 0) {
1119                 dev_dbg(&client->dev, "nothing at this address: %d\n", ret);
1120                 ret = -ENXIO;
1121                 goto err_regulator;
1122         }
1123
1124         ret = i2c_hid_fetch_hid_descriptor(ihid);
1125         if (ret < 0)
1126                 goto err_regulator;
1127
1128         ret = i2c_hid_init_irq(client);
1129         if (ret < 0)
1130                 goto err_regulator;
1131
1132         hid = hid_allocate_device();
1133         if (IS_ERR(hid)) {
1134                 ret = PTR_ERR(hid);
1135                 goto err_irq;
1136         }
1137
1138         ihid->hid = hid;
1139
1140         hid->driver_data = client;
1141         hid->ll_driver = &i2c_hid_ll_driver;
1142         hid->dev.parent = &client->dev;
1143         hid->bus = BUS_I2C;
1144         hid->version = le16_to_cpu(ihid->hdesc.bcdVersion);
1145         hid->vendor = le16_to_cpu(ihid->hdesc.wVendorID);
1146         hid->product = le16_to_cpu(ihid->hdesc.wProductID);
1147
1148         snprintf(hid->name, sizeof(hid->name), "%s %04X:%04X",
1149                  client->name, (u16)hid->vendor, (u16)hid->product);
1150         strlcpy(hid->phys, dev_name(&client->dev), sizeof(hid->phys));
1151
1152         ihid->quirks = i2c_hid_lookup_quirk(hid->vendor, hid->product);
1153
1154         ret = hid_add_device(hid);
1155         if (ret) {
1156                 if (ret != -ENODEV)
1157                         hid_err(client, "can't add hid device: %d\n", ret);
1158                 goto err_mem_free;
1159         }
1160
1161         return 0;
1162
1163 err_mem_free:
1164         hid_destroy_device(hid);
1165
1166 err_irq:
1167         free_irq(client->irq, ihid);
1168
1169 err_regulator:
1170         regulator_bulk_disable(ARRAY_SIZE(ihid->pdata.supplies),
1171                                ihid->pdata.supplies);
1172         i2c_hid_free_buffers(ihid);
1173         return ret;
1174 }
1175
1176 static int i2c_hid_remove(struct i2c_client *client)
1177 {
1178         struct i2c_hid *ihid = i2c_get_clientdata(client);
1179         struct hid_device *hid;
1180
1181         hid = ihid->hid;
1182         hid_destroy_device(hid);
1183
1184         free_irq(client->irq, ihid);
1185
1186         if (ihid->bufsize)
1187                 i2c_hid_free_buffers(ihid);
1188
1189         regulator_bulk_disable(ARRAY_SIZE(ihid->pdata.supplies),
1190                                ihid->pdata.supplies);
1191
1192         return 0;
1193 }
1194
1195 static void i2c_hid_shutdown(struct i2c_client *client)
1196 {
1197         struct i2c_hid *ihid = i2c_get_clientdata(client);
1198
1199         i2c_hid_set_power(client, I2C_HID_PWR_SLEEP);
1200         free_irq(client->irq, ihid);
1201
1202         i2c_hid_acpi_shutdown(&client->dev);
1203 }
1204
1205 #ifdef CONFIG_PM_SLEEP
1206 static int i2c_hid_suspend(struct device *dev)
1207 {
1208         struct i2c_client *client = to_i2c_client(dev);
1209         struct i2c_hid *ihid = i2c_get_clientdata(client);
1210         struct hid_device *hid = ihid->hid;
1211         int ret;
1212         int wake_status;
1213
1214         if (hid->driver && hid->driver->suspend) {
1215                 ret = hid->driver->suspend(hid, PMSG_SUSPEND);
1216                 if (ret < 0)
1217                         return ret;
1218         }
1219
1220         /* Save some power */
1221         i2c_hid_set_power(client, I2C_HID_PWR_SLEEP);
1222
1223         disable_irq(client->irq);
1224
1225         if (device_may_wakeup(&client->dev)) {
1226                 wake_status = enable_irq_wake(client->irq);
1227                 if (!wake_status)
1228                         ihid->irq_wake_enabled = true;
1229                 else
1230                         hid_warn(hid, "Failed to enable irq wake: %d\n",
1231                                 wake_status);
1232         } else {
1233                 regulator_bulk_disable(ARRAY_SIZE(ihid->pdata.supplies),
1234                                        ihid->pdata.supplies);
1235         }
1236
1237         return 0;
1238 }
1239
1240 static int i2c_hid_resume(struct device *dev)
1241 {
1242         int ret;
1243         struct i2c_client *client = to_i2c_client(dev);
1244         struct i2c_hid *ihid = i2c_get_clientdata(client);
1245         struct hid_device *hid = ihid->hid;
1246         int wake_status;
1247
1248         if (!device_may_wakeup(&client->dev)) {
1249                 ret = regulator_bulk_enable(ARRAY_SIZE(ihid->pdata.supplies),
1250                                             ihid->pdata.supplies);
1251                 if (ret)
1252                         hid_warn(hid, "Failed to enable supplies: %d\n", ret);
1253
1254                 if (ihid->pdata.post_power_delay_ms)
1255                         msleep(ihid->pdata.post_power_delay_ms);
1256         } else if (ihid->irq_wake_enabled) {
1257                 wake_status = disable_irq_wake(client->irq);
1258                 if (!wake_status)
1259                         ihid->irq_wake_enabled = false;
1260                 else
1261                         hid_warn(hid, "Failed to disable irq wake: %d\n",
1262                                 wake_status);
1263         }
1264
1265         enable_irq(client->irq);
1266
1267         /* Instead of resetting device, simply powers the device on. This
1268          * solves "incomplete reports" on Raydium devices 2386:3118 and
1269          * 2386:4B33 and fixes various SIS touchscreens no longer sending
1270          * data after a suspend/resume.
1271          *
1272          * However some ALPS touchpads generate IRQ storm without reset, so
1273          * let's still reset them here.
1274          */
1275         if (ihid->quirks & I2C_HID_QUIRK_RESET_ON_RESUME)
1276                 ret = i2c_hid_hwreset(client);
1277         else
1278                 ret = i2c_hid_set_power(client, I2C_HID_PWR_ON);
1279
1280         if (ret)
1281                 return ret;
1282
1283         if (hid->driver && hid->driver->reset_resume) {
1284                 ret = hid->driver->reset_resume(hid);
1285                 return ret;
1286         }
1287
1288         return 0;
1289 }
1290 #endif
1291
1292 static const struct dev_pm_ops i2c_hid_pm = {
1293         SET_SYSTEM_SLEEP_PM_OPS(i2c_hid_suspend, i2c_hid_resume)
1294 };
1295
1296 static const struct i2c_device_id i2c_hid_id_table[] = {
1297         { "hid", 0 },
1298         { "hid-over-i2c", 0 },
1299         { },
1300 };
1301 MODULE_DEVICE_TABLE(i2c, i2c_hid_id_table);
1302
1303
1304 static struct i2c_driver i2c_hid_driver = {
1305         .driver = {
1306                 .name   = "i2c_hid",
1307                 .pm     = &i2c_hid_pm,
1308                 .probe_type = PROBE_PREFER_ASYNCHRONOUS,
1309                 .acpi_match_table = ACPI_PTR(i2c_hid_acpi_match),
1310                 .of_match_table = of_match_ptr(i2c_hid_of_match),
1311         },
1312
1313         .probe          = i2c_hid_probe,
1314         .remove         = i2c_hid_remove,
1315         .shutdown       = i2c_hid_shutdown,
1316         .id_table       = i2c_hid_id_table,
1317 };
1318
1319 module_i2c_driver(i2c_hid_driver);
1320
1321 MODULE_DESCRIPTION("HID over I2C core driver");
1322 MODULE_AUTHOR("Benjamin Tissoires <benjamin.tissoires@gmail.com>");
1323 MODULE_LICENSE("GPL");