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

   1 /*
   2  * HID over I2C protocol implementation
   3  *
   4  * Copyright (c) 2012 Benjamin Tissoires <benjamin.tissoires@gmail.com>
   5  * Copyright (c) 2012 Ecole Nationale de l'Aviation Civile, France
   6  * Copyright (c) 2012 Red Hat, Inc
   7  *
   8  * This code is partly based on "USB HID support for Linux":
   9  *
  10  *  Copyright (c) 1999 Andreas Gal
  11  *  Copyright (c) 2000-2005 Vojtech Pavlik <vojtech@suse.cz>
  12  *  Copyright (c) 2005 Michael Haboustak <mike-@cinci.rr.com> for Concept2, Inc
  13  *  Copyright (c) 2007-2008 Oliver Neukum
  14  *  Copyright (c) 2006-2010 Jiri Kosina
  15  *
  16  * This file is subject to the terms and conditions of the GNU General Public
  17  * License.  See the file COPYING in the main directory of this archive for
  18  * more details.
  19  */
  20
  21 #include <linux/module.h>
  22 #include <linux/i2c.h>
  23 #include <linux/interrupt.h>
  24 #include <linux/input.h>
  25 #include <linux/irq.h>
  26 #include <linux/delay.h>
  27 #include <linux/slab.h>
  28 #include <linux/pm.h>
  29 #include <linux/pm_runtime.h>
  30 #include <linux/device.h>
  31 #include <linux/wait.h>
  32 #include <linux/err.h>
  33 #include <linux/string.h>
  34 #include <linux/list.h>
  35 #include <linux/jiffies.h>
  36 #include <linux/kernel.h>
  37 #include <linux/hid.h>
  38 #include <linux/mutex.h>
  39 #include <linux/acpi.h>
  40 #include <linux/of.h>
  41 #include <linux/regulator/consumer.h>
  42
  43 #include <linux/platform_data/i2c-hid.h>
  44
  45 #include "../hid-ids.h"
  46 #include "i2c-hid.h"
  47
  48 /* quirks to control the device */
  49 #define I2C_HID_QUIRK_SET_PWR_WAKEUP_DEV        BIT(0)
  50 #define I2C_HID_QUIRK_NO_IRQ_AFTER_RESET        BIT(1)
  51 #define I2C_HID_QUIRK_NO_RUNTIME_PM             BIT(2)
  52 #define I2C_HID_QUIRK_DELAY_AFTER_SLEEP         BIT(3)
  53 #define I2C_HID_QUIRK_BOGUS_IRQ                 BIT(4)
  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         unsigned long           sleep_delay;
 165 };
 166
 167 static const struct i2c_hid_quirks {
 168         __u16 idVendor;
 169         __u16 idProduct;
 170         __u32 quirks;
 171 } i2c_hid_quirks[] = {
 172         { USB_VENDOR_ID_WEIDA, HID_ANY_ID,
 173                 I2C_HID_QUIRK_SET_PWR_WAKEUP_DEV },
 174         { I2C_VENDOR_ID_HANTICK, I2C_PRODUCT_ID_HANTICK_5288,
 175                 I2C_HID_QUIRK_NO_IRQ_AFTER_RESET |
 176                 I2C_HID_QUIRK_NO_RUNTIME_PM },
 177         { I2C_VENDOR_ID_RAYDIUM, I2C_PRODUCT_ID_RAYDIUM_4B33,
 178                 I2C_HID_QUIRK_DELAY_AFTER_SLEEP },
 179         { USB_VENDOR_ID_LG, I2C_DEVICE_ID_LG_8001,
 180                 I2C_HID_QUIRK_NO_RUNTIME_PM },
 181         { I2C_VENDOR_ID_GOODIX, I2C_DEVICE_ID_GOODIX_01F0,
 182                 I2C_HID_QUIRK_NO_RUNTIME_PM },
 183         { USB_VENDOR_ID_ELAN, HID_ANY_ID,
 184                  I2C_HID_QUIRK_BOGUS_IRQ },
 185         { 0, 0 }
 186 };
 187
 188 /*
 189  * i2c_hid_lookup_quirk: return any quirks associated with a I2C HID device
 190  * @idVendor: the 16-bit vendor ID
 191  * @idProduct: the 16-bit product ID
 192  *
 193  * Returns: a u32 quirks value.
 194  */
 195 static u32 i2c_hid_lookup_quirk(const u16 idVendor, const u16 idProduct)
 196 {
 197         u32 quirks = 0;
 198         int n;
 199
 200         for (n = 0; i2c_hid_quirks[n].idVendor; n++)
 201                 if (i2c_hid_quirks[n].idVendor == idVendor &&
 202                     (i2c_hid_quirks[n].idProduct == (__u16)HID_ANY_ID ||
 203                      i2c_hid_quirks[n].idProduct == idProduct))
 204                         quirks = i2c_hid_quirks[n].quirks;
 205
 206         return quirks;
 207 }
 208
 209 static int __i2c_hid_command(struct i2c_client *client,
 210                 const struct i2c_hid_cmd *command, u8 reportID,
 211                 u8 reportType, u8 *args, int args_len,
 212                 unsigned char *buf_recv, int data_len)
 213 {
 214         struct i2c_hid *ihid = i2c_get_clientdata(client);
 215         union command *cmd = (union command *)ihid->cmdbuf;
 216         int ret;
 217         struct i2c_msg msg[2];
 218         int msg_num = 1;
 219
 220         int length = command->length;
 221         bool wait = command->wait;
 222         unsigned int registerIndex = command->registerIndex;
 223
 224         /* special case for hid_descr_cmd */
 225         if (command == &hid_descr_cmd) {
 226                 cmd->c.reg = ihid->wHIDDescRegister;
 227         } else {
 228                 cmd->data[0] = ihid->hdesc_buffer[registerIndex];
 229                 cmd->data[1] = ihid->hdesc_buffer[registerIndex + 1];
 230         }
 231
 232         if (length > 2) {
 233                 cmd->c.opcode = command->opcode;
 234                 cmd->c.reportTypeID = reportID | reportType << 4;
 235         }
 236
 237         memcpy(cmd->data + length, args, args_len);
 238         length += args_len;
 239
 240         i2c_hid_dbg(ihid, "%s: cmd=%*ph\n", __func__, length, cmd->data);
 241
 242         msg[0].addr = client->addr;
 243         msg[0].flags = client->flags & I2C_M_TEN;
 244         msg[0].len = length;
 245         msg[0].buf = cmd->data;
 246         if (data_len > 0) {
 247                 msg[1].addr = client->addr;
 248                 msg[1].flags = client->flags & I2C_M_TEN;
 249                 msg[1].flags |= I2C_M_RD;
 250                 msg[1].len = data_len;
 251                 msg[1].buf = buf_recv;
 252                 msg_num = 2;
 253                 set_bit(I2C_HID_READ_PENDING, &ihid->flags);
 254         }
 255
 256         if (wait)
 257                 set_bit(I2C_HID_RESET_PENDING, &ihid->flags);
 258
 259         ret = i2c_transfer(client->adapter, msg, msg_num);
 260
 261         if (data_len > 0)
 262                 clear_bit(I2C_HID_READ_PENDING, &ihid->flags);
 263
 264         if (ret != msg_num)
 265                 return ret < 0 ? ret : -EIO;
 266
 267         ret = 0;
 268
 269         if (wait && (ihid->quirks & I2C_HID_QUIRK_NO_IRQ_AFTER_RESET)) {
 270                 msleep(100);
 271         } else if (wait) {
 272                 i2c_hid_dbg(ihid, "%s: waiting...\n", __func__);
 273                 if (!wait_event_timeout(ihid->wait,
 274                                 !test_bit(I2C_HID_RESET_PENDING, &ihid->flags),
 275                                 msecs_to_jiffies(5000)))
 276                         ret = -ENODATA;
 277                 i2c_hid_dbg(ihid, "%s: finished.\n", __func__);
 278         }
 279
 280         return ret;
 281 }
 282
 283 static int i2c_hid_command(struct i2c_client *client,
 284                 const struct i2c_hid_cmd *command,
 285                 unsigned char *buf_recv, int data_len)
 286 {
 287         return __i2c_hid_command(client, command, 0, 0, NULL, 0,
 288                                 buf_recv, data_len);
 289 }
 290
 291 static int i2c_hid_get_report(struct i2c_client *client, u8 reportType,
 292                 u8 reportID, unsigned char *buf_recv, int data_len)
 293 {
 294         struct i2c_hid *ihid = i2c_get_clientdata(client);
 295         u8 args[3];
 296         int ret;
 297         int args_len = 0;
 298         u16 readRegister = le16_to_cpu(ihid->hdesc.wDataRegister);
 299
 300         i2c_hid_dbg(ihid, "%s\n", __func__);
 301
 302         if (reportID >= 0x0F) {
 303                 args[args_len++] = reportID;
 304                 reportID = 0x0F;
 305         }
 306
 307         args[args_len++] = readRegister & 0xFF;
 308         args[args_len++] = readRegister >> 8;
 309
 310         ret = __i2c_hid_command(client, &hid_get_report_cmd, reportID,
 311                 reportType, args, args_len, buf_recv, data_len);
 312         if (ret) {
 313                 dev_err(&client->dev,
 314                         "failed to retrieve report from device.\n");
 315                 return ret;
 316         }
 317
 318         return 0;
 319 }
 320
 321 /**
 322  * i2c_hid_set_or_send_report: forward an incoming report to the device
 323  * @client: the i2c_client of the device
 324  * @reportType: 0x03 for HID_FEATURE_REPORT ; 0x02 for HID_OUTPUT_REPORT
 325  * @reportID: the report ID
 326  * @buf: the actual data to transfer, without the report ID
 327  * @len: size of buf
 328  * @use_data: true: use SET_REPORT HID command, false: send plain OUTPUT report
 329  */
 330 static int i2c_hid_set_or_send_report(struct i2c_client *client, u8 reportType,
 331                 u8 reportID, unsigned char *buf, size_t data_len, bool use_data)
 332 {
 333         struct i2c_hid *ihid = i2c_get_clientdata(client);
 334         u8 *args = ihid->argsbuf;
 335         const struct i2c_hid_cmd *hidcmd;
 336         int ret;
 337         u16 dataRegister = le16_to_cpu(ihid->hdesc.wDataRegister);
 338         u16 outputRegister = le16_to_cpu(ihid->hdesc.wOutputRegister);
 339         u16 maxOutputLength = le16_to_cpu(ihid->hdesc.wMaxOutputLength);
 340         u16 size;
 341         int args_len;
 342         int index = 0;
 343
 344         i2c_hid_dbg(ihid, "%s\n", __func__);
 345
 346         if (data_len > ihid->bufsize)
 347                 return -EINVAL;
 348
 349         size =          2                       /* size */ +
 350                         (reportID ? 1 : 0)      /* reportID */ +
 351                         data_len                /* buf */;
 352         args_len =      (reportID >= 0x0F ? 1 : 0) /* optional third byte */ +
 353                         2                       /* dataRegister */ +
 354                         size                    /* args */;
 355
 356         if (!use_data && maxOutputLength == 0)
 357                 return -ENOSYS;
 358
 359         if (reportID >= 0x0F) {
 360                 args[index++] = reportID;
 361                 reportID = 0x0F;
 362         }
 363
 364         /*
 365          * use the data register for feature reports or if the device does not
 366          * support the output register
 367          */
 368         if (use_data) {
 369                 args[index++] = dataRegister & 0xFF;
 370                 args[index++] = dataRegister >> 8;
 371                 hidcmd = &hid_set_report_cmd;
 372         } else {
 373                 args[index++] = outputRegister & 0xFF;
 374                 args[index++] = outputRegister >> 8;
 375                 hidcmd = &hid_no_cmd;
 376         }
 377
 378         args[index++] = size & 0xFF;
 379         args[index++] = size >> 8;
 380
 381         if (reportID)
 382                 args[index++] = reportID;
 383
 384         memcpy(&args[index], buf, data_len);
 385
 386         ret = __i2c_hid_command(client, hidcmd, reportID,
 387                 reportType, args, args_len, NULL, 0);
 388         if (ret) {
 389                 dev_err(&client->dev, "failed to set a report to device.\n");
 390                 return ret;
 391         }
 392
 393         return data_len;
 394 }
 395
 396 static int i2c_hid_set_power(struct i2c_client *client, int power_state)
 397 {
 398         struct i2c_hid *ihid = i2c_get_clientdata(client);
 399         int ret;
 400         unsigned long now, delay;
 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         if (ihid->quirks & I2C_HID_QUIRK_DELAY_AFTER_SLEEP &&
 419             power_state == I2C_HID_PWR_ON) {
 420                 now = jiffies;
 421                 if (time_after(ihid->sleep_delay, now)) {
 422                         delay = jiffies_to_usecs(ihid->sleep_delay - now);
 423                         usleep_range(delay, delay + 1);
 424                 }
 425         }
 426
 427         ret = __i2c_hid_command(client, &hid_set_power_cmd, power_state,
 428                 0, NULL, 0, NULL, 0);
 429
 430         if (ihid->quirks & I2C_HID_QUIRK_DELAY_AFTER_SLEEP &&
 431             power_state == I2C_HID_PWR_SLEEP)
 432                 ihid->sleep_delay = jiffies + msecs_to_jiffies(20);
 433
 434         if (ret)
 435                 dev_err(&client->dev, "failed to change power setting.\n");
 436
 437 set_pwr_exit:
 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         /*
 460          * The HID over I2C specification states that if a DEVICE needs time
 461          * after the PWR_ON request, it should utilise CLOCK stretching.
 462          * However, it has been observered that the Windows driver provides a
 463          * 1ms sleep between the PWR_ON and RESET requests and that some devices
 464          * rely on this.
 465          */
 466         usleep_range(1000, 5000);
 467
 468         i2c_hid_dbg(ihid, "resetting...\n");
 469
 470         ret = i2c_hid_command(client, &hid_reset_cmd, NULL, 0);
 471         if (ret) {
 472                 dev_err(&client->dev, "failed to reset device.\n");
 473                 i2c_hid_set_power(client, I2C_HID_PWR_SLEEP);
 474         }
 475
 476 out_unlock:
 477         mutex_unlock(&ihid->reset_lock);
 478         return ret;
 479 }
 480
 481 static void i2c_hid_get_input(struct i2c_hid *ihid)
 482 {
 483         int ret;
 484         u32 ret_size;
 485         int size = le16_to_cpu(ihid->hdesc.wMaxInputLength);
 486
 487         if (size > ihid->bufsize)
 488                 size = ihid->bufsize;
 489
 490         ret = i2c_master_recv(ihid->client, ihid->inbuf, size);
 491         if (ret != size) {
 492                 if (ret < 0)
 493                         return;
 494
 495                 dev_err(&ihid->client->dev, "%s: got %d data instead of %d\n",
 496                         __func__, ret, size);
 497                 return;
 498         }
 499
 500         ret_size = ihid->inbuf[0] | ihid->inbuf[1] << 8;
 501
 502         if (!ret_size) {
 503                 /* host or device initiated RESET completed */
 504                 if (test_and_clear_bit(I2C_HID_RESET_PENDING, &ihid->flags))
 505                         wake_up(&ihid->wait);
 506                 return;
 507         }
 508
 509         if (ihid->quirks & I2C_HID_QUIRK_BOGUS_IRQ && ret_size == 0xffff) {
 510                 dev_warn_once(&ihid->client->dev, "%s: IRQ triggered but "
 511                               "there's no data\n", __func__);
 512                 return;
 513         }
 514
 515         if ((ret_size > size) || (ret_size < 2)) {
 516                 dev_err(&ihid->client->dev, "%s: incomplete report (%d/%d)\n",
 517                         __func__, size, ret_size);
 518                 return;
 519         }
 520
 521         i2c_hid_dbg(ihid, "input: %*ph\n", ret_size, ihid->inbuf);
 522
 523         if (test_bit(I2C_HID_STARTED, &ihid->flags))
 524                 hid_input_report(ihid->hid, HID_INPUT_REPORT, ihid->inbuf + 2,
 525                                 ret_size - 2, 1);
 526
 527         return;
 528 }
 529
 530 static irqreturn_t i2c_hid_irq(int irq, void *dev_id)
 531 {
 532         struct i2c_hid *ihid = dev_id;
 533
 534         if (test_bit(I2C_HID_READ_PENDING, &ihid->flags))
 535                 return IRQ_HANDLED;
 536
 537         i2c_hid_get_input(ihid);
 538
 539         return IRQ_HANDLED;
 540 }
 541
 542 static int i2c_hid_get_report_length(struct hid_report *report)
 543 {
 544         return ((report->size - 1) >> 3) + 1 +
 545                 report->device->report_enum[report->type].numbered + 2;
 546 }
 547
 548 /*
 549  * Traverse the supplied list of reports and find the longest
 550  */
 551 static void i2c_hid_find_max_report(struct hid_device *hid, unsigned int type,
 552                 unsigned int *max)
 553 {
 554         struct hid_report *report;
 555         unsigned int size;
 556
 557         /* We should not rely on wMaxInputLength, as some devices may set it to
 558          * a wrong length. */
 559         list_for_each_entry(report, &hid->report_enum[type].report_list, list) {
 560                 size = i2c_hid_get_report_length(report);
 561                 if (*max < size)
 562                         *max = size;
 563         }
 564 }
 565
 566 static void i2c_hid_free_buffers(struct i2c_hid *ihid)
 567 {
 568         kfree(ihid->inbuf);
 569         kfree(ihid->rawbuf);
 570         kfree(ihid->argsbuf);
 571         kfree(ihid->cmdbuf);
 572         ihid->inbuf = NULL;
 573         ihid->rawbuf = NULL;
 574         ihid->cmdbuf = NULL;
 575         ihid->argsbuf = NULL;
 576         ihid->bufsize = 0;
 577 }
 578
 579 static int i2c_hid_alloc_buffers(struct i2c_hid *ihid, size_t report_size)
 580 {
 581         /* the worst case is computed from the set_report command with a
 582          * reportID > 15 and the maximum report length */
 583         int args_len = sizeof(__u8) + /* ReportID */
 584                        sizeof(__u8) + /* optional ReportID byte */
 585                        sizeof(__u16) + /* data register */
 586                        sizeof(__u16) + /* size of the report */
 587                        report_size; /* report */
 588
 589         ihid->inbuf = kzalloc(report_size, GFP_KERNEL);
 590         ihid->rawbuf = kzalloc(report_size, GFP_KERNEL);
 591         ihid->argsbuf = kzalloc(args_len, GFP_KERNEL);
 592         ihid->cmdbuf = kzalloc(sizeof(union command) + args_len, GFP_KERNEL);
 593
 594         if (!ihid->inbuf || !ihid->rawbuf || !ihid->argsbuf || !ihid->cmdbuf) {
 595                 i2c_hid_free_buffers(ihid);
 596                 return -ENOMEM;
 597         }
 598
 599         ihid->bufsize = report_size;
 600
 601         return 0;
 602 }
 603
 604 static int i2c_hid_get_raw_report(struct hid_device *hid,
 605                 unsigned char report_number, __u8 *buf, size_t count,
 606                 unsigned char report_type)
 607 {
 608         struct i2c_client *client = hid->driver_data;
 609         struct i2c_hid *ihid = i2c_get_clientdata(client);
 610         size_t ret_count, ask_count;
 611         int ret;
 612
 613         if (report_type == HID_OUTPUT_REPORT)
 614                 return -EINVAL;
 615
 616         /* +2 bytes to include the size of the reply in the query buffer */
 617         ask_count = min(count + 2, (size_t)ihid->bufsize);
 618
 619         ret = i2c_hid_get_report(client,
 620                         report_type == HID_FEATURE_REPORT ? 0x03 : 0x01,
 621                         report_number, ihid->rawbuf, ask_count);
 622
 623         if (ret < 0)
 624                 return ret;
 625
 626         ret_count = ihid->rawbuf[0] | (ihid->rawbuf[1] << 8);
 627
 628         if (ret_count <= 2)
 629                 return 0;
 630
 631         ret_count = min(ret_count, ask_count);
 632
 633         /* The query buffer contains the size, dropping it in the reply */
 634         count = min(count, ret_count - 2);
 635         memcpy(buf, ihid->rawbuf + 2, count);
 636
 637         return count;
 638 }
 639
 640 static int i2c_hid_output_raw_report(struct hid_device *hid, __u8 *buf,
 641                 size_t count, unsigned char report_type, bool use_data)
 642 {
 643         struct i2c_client *client = hid->driver_data;
 644         struct i2c_hid *ihid = i2c_get_clientdata(client);
 645         int report_id = buf[0];
 646         int ret;
 647
 648         if (report_type == HID_INPUT_REPORT)
 649                 return -EINVAL;
 650
 651         mutex_lock(&ihid->reset_lock);
 652
 653         if (report_id) {
 654                 buf++;
 655                 count--;
 656         }
 657
 658         ret = i2c_hid_set_or_send_report(client,
 659                                 report_type == HID_FEATURE_REPORT ? 0x03 : 0x02,
 660                                 report_id, buf, count, use_data);
 661
 662         if (report_id && ret >= 0)
 663                 ret++; /* add report_id to the number of transfered bytes */
 664
 665         mutex_unlock(&ihid->reset_lock);
 666
 667         return ret;
 668 }
 669
 670 static int i2c_hid_output_report(struct hid_device *hid, __u8 *buf,
 671                 size_t count)
 672 {
 673         return i2c_hid_output_raw_report(hid, buf, count, HID_OUTPUT_REPORT,
 674                         false);
 675 }
 676
 677 static int i2c_hid_raw_request(struct hid_device *hid, unsigned char reportnum,
 678                                __u8 *buf, size_t len, unsigned char rtype,
 679                                int reqtype)
 680 {
 681         switch (reqtype) {
 682         case HID_REQ_GET_REPORT:
 683                 return i2c_hid_get_raw_report(hid, reportnum, buf, len, rtype);
 684         case HID_REQ_SET_REPORT:
 685                 if (buf[0] != reportnum)
 686                         return -EINVAL;
 687                 return i2c_hid_output_raw_report(hid, buf, len, rtype, true);
 688         default:
 689                 return -EIO;
 690         }
 691 }
 692
 693 static int i2c_hid_parse(struct hid_device *hid)
 694 {
 695         struct i2c_client *client = hid->driver_data;
 696         struct i2c_hid *ihid = i2c_get_clientdata(client);
 697         struct i2c_hid_desc *hdesc = &ihid->hdesc;
 698         unsigned int rsize;
 699         char *rdesc;
 700         int ret;
 701         int tries = 3;
 702         char *use_override;
 703
 704         i2c_hid_dbg(ihid, "entering %s\n", __func__);
 705
 706         rsize = le16_to_cpu(hdesc->wReportDescLength);
 707         if (!rsize || rsize > HID_MAX_DESCRIPTOR_SIZE) {
 708                 dbg_hid("weird size of report descriptor (%u)\n", rsize);
 709                 return -EINVAL;
 710         }
 711
 712         do {
 713                 ret = i2c_hid_hwreset(client);
 714                 if (ret)
 715                         msleep(1000);
 716         } while (tries-- > 0 && ret);
 717
 718         if (ret)
 719                 return ret;
 720
 721         use_override = i2c_hid_get_dmi_hid_report_desc_override(client->name,
 722                                                                 &rsize);
 723
 724         if (use_override) {
 725                 rdesc = use_override;
 726                 i2c_hid_dbg(ihid, "Using a HID report descriptor override\n");
 727         } else {
 728                 rdesc = kzalloc(rsize, GFP_KERNEL);
 729
 730                 if (!rdesc) {
 731                         dbg_hid("couldn't allocate rdesc memory\n");
 732                         return -ENOMEM;
 733                 }
 734
 735                 i2c_hid_dbg(ihid, "asking HID report descriptor\n");
 736
 737                 ret = i2c_hid_command(client, &hid_report_descr_cmd,
 738                                       rdesc, rsize);
 739                 if (ret) {
 740                         hid_err(hid, "reading report descriptor failed\n");
 741                         kfree(rdesc);
 742                         return -EIO;
 743                 }
 744         }
 745
 746         i2c_hid_dbg(ihid, "Report Descriptor: %*ph\n", rsize, rdesc);
 747
 748         ret = hid_parse_report(hid, rdesc, rsize);
 749         if (!use_override)
 750                 kfree(rdesc);
 751
 752         if (ret) {
 753                 dbg_hid("parsing report descriptor failed\n");
 754                 return ret;
 755         }
 756
 757         return 0;
 758 }
 759
 760 static int i2c_hid_start(struct hid_device *hid)
 761 {
 762         struct i2c_client *client = hid->driver_data;
 763         struct i2c_hid *ihid = i2c_get_clientdata(client);
 764         int ret;
 765         unsigned int bufsize = HID_MIN_BUFFER_SIZE;
 766
 767         i2c_hid_find_max_report(hid, HID_INPUT_REPORT, &bufsize);
 768         i2c_hid_find_max_report(hid, HID_OUTPUT_REPORT, &bufsize);
 769         i2c_hid_find_max_report(hid, HID_FEATURE_REPORT, &bufsize);
 770
 771         if (bufsize > ihid->bufsize) {
 772                 disable_irq(client->irq);
 773                 i2c_hid_free_buffers(ihid);
 774
 775                 ret = i2c_hid_alloc_buffers(ihid, bufsize);
 776                 enable_irq(client->irq);
 777
 778                 if (ret)
 779                         return ret;
 780         }
 781
 782         return 0;
 783 }
 784
 785 static void i2c_hid_stop(struct hid_device *hid)
 786 {
 787         hid->claimed = 0;
 788 }
 789
 790 static int i2c_hid_open(struct hid_device *hid)
 791 {
 792         struct i2c_client *client = hid->driver_data;
 793         struct i2c_hid *ihid = i2c_get_clientdata(client);
 794         int ret = 0;
 795
 796         ret = pm_runtime_get_sync(&client->dev);
 797         if (ret < 0)
 798                 return ret;
 799
 800         set_bit(I2C_HID_STARTED, &ihid->flags);
 801         return 0;
 802 }
 803
 804 static void i2c_hid_close(struct hid_device *hid)
 805 {
 806         struct i2c_client *client = hid->driver_data;
 807         struct i2c_hid *ihid = i2c_get_clientdata(client);
 808
 809         clear_bit(I2C_HID_STARTED, &ihid->flags);
 810
 811         /* Save some power */
 812         pm_runtime_put(&client->dev);
 813 }
 814
 815 static int i2c_hid_power(struct hid_device *hid, int lvl)
 816 {
 817         struct i2c_client *client = hid->driver_data;
 818         struct i2c_hid *ihid = i2c_get_clientdata(client);
 819
 820         i2c_hid_dbg(ihid, "%s lvl:%d\n", __func__, lvl);
 821
 822         switch (lvl) {
 823         case PM_HINT_FULLON:
 824                 pm_runtime_get_sync(&client->dev);
 825                 break;
 826         case PM_HINT_NORMAL:
 827                 pm_runtime_put(&client->dev);
 828                 break;
 829         }
 830         return 0;
 831 }
 832
 833 struct hid_ll_driver i2c_hid_ll_driver = {
 834         .parse = i2c_hid_parse,
 835         .start = i2c_hid_start,
 836         .stop = i2c_hid_stop,
 837         .open = i2c_hid_open,
 838         .close = i2c_hid_close,
 839         .power = i2c_hid_power,
 840         .output_report = i2c_hid_output_report,
 841         .raw_request = i2c_hid_raw_request,
 842 };
 843 EXPORT_SYMBOL_GPL(i2c_hid_ll_driver);
 844
 845 static int i2c_hid_init_irq(struct i2c_client *client)
 846 {
 847         struct i2c_hid *ihid = i2c_get_clientdata(client);
 848         unsigned long irqflags = 0;
 849         int ret;
 850
 851         dev_dbg(&client->dev, "Requesting IRQ: %d\n", client->irq);
 852
 853         if (!irq_get_trigger_type(client->irq))
 854                 irqflags = IRQF_TRIGGER_LOW;
 855
 856         ret = request_threaded_irq(client->irq, NULL, i2c_hid_irq,
 857                                    irqflags | IRQF_ONESHOT, client->name, ihid);
 858         if (ret < 0) {
 859                 dev_warn(&client->dev,
 860                         "Could not register for %s interrupt, irq = %d,"
 861                         " ret = %d\n",
 862                         client->name, client->irq, ret);
 863
 864                 return ret;
 865         }
 866
 867         return 0;
 868 }
 869
 870 static int i2c_hid_fetch_hid_descriptor(struct i2c_hid *ihid)
 871 {
 872         struct i2c_client *client = ihid->client;
 873         struct i2c_hid_desc *hdesc = &ihid->hdesc;
 874         unsigned int dsize;
 875         int ret;
 876
 877         /* i2c hid fetch using a fixed descriptor size (30 bytes) */
 878         if (i2c_hid_get_dmi_i2c_hid_desc_override(client->name)) {
 879                 i2c_hid_dbg(ihid, "Using a HID descriptor override\n");
 880                 ihid->hdesc =
 881                         *i2c_hid_get_dmi_i2c_hid_desc_override(client->name);
 882         } else {
 883                 i2c_hid_dbg(ihid, "Fetching the HID descriptor\n");
 884                 ret = i2c_hid_command(client, &hid_descr_cmd,
 885                                       ihid->hdesc_buffer,
 886                                       sizeof(struct i2c_hid_desc));
 887                 if (ret) {
 888                         dev_err(&client->dev, "hid_descr_cmd failed\n");
 889                         return -ENODEV;
 890                 }
 891         }
 892
 893         /* Validate the length of HID descriptor, the 4 first bytes:
 894          * bytes 0-1 -> length
 895          * bytes 2-3 -> bcdVersion (has to be 1.00) */
 896         /* check bcdVersion == 1.0 */
 897         if (le16_to_cpu(hdesc->bcdVersion) != 0x0100) {
 898                 dev_err(&client->dev,
 899                         "unexpected HID descriptor bcdVersion (0x%04hx)\n",
 900                         le16_to_cpu(hdesc->bcdVersion));
 901                 return -ENODEV;
 902         }
 903
 904         /* Descriptor length should be 30 bytes as per the specification */
 905         dsize = le16_to_cpu(hdesc->wHIDDescLength);
 906         if (dsize != sizeof(struct i2c_hid_desc)) {
 907                 dev_err(&client->dev, "weird size of HID descriptor (%u)\n",
 908                         dsize);
 909                 return -ENODEV;
 910         }
 911         i2c_hid_dbg(ihid, "HID Descriptor: %*ph\n", dsize, ihid->hdesc_buffer);
 912         return 0;
 913 }
 914
 915 #ifdef CONFIG_ACPI
 916 static const struct acpi_device_id i2c_hid_acpi_blacklist[] = {
 917         /*
 918          * The CHPN0001 ACPI device, which is used to describe the Chipone
 919          * ICN8505 controller, has a _CID of PNP0C50 but is not HID compatible.
 920          */
 921         {"CHPN0001", 0 },
 922         { },
 923 };
 924
 925 static int i2c_hid_acpi_pdata(struct i2c_client *client,
 926                 struct i2c_hid_platform_data *pdata)
 927 {
 928         static guid_t i2c_hid_guid =
 929                 GUID_INIT(0x3CDFF6F7, 0x4267, 0x4555,
 930                           0xAD, 0x05, 0xB3, 0x0A, 0x3D, 0x89, 0x38, 0xDE);
 931         union acpi_object *obj;
 932         struct acpi_device *adev;
 933         acpi_handle handle;
 934
 935         handle = ACPI_HANDLE(&client->dev);
 936         if (!handle || acpi_bus_get_device(handle, &adev)) {
 937                 dev_err(&client->dev, "Error could not get ACPI device\n");
 938                 return -ENODEV;
 939         }
 940
 941         if (acpi_match_device_ids(adev, i2c_hid_acpi_blacklist) == 0)
 942                 return -ENODEV;
 943
 944         obj = acpi_evaluate_dsm_typed(handle, &i2c_hid_guid, 1, 1, NULL,
 945                                       ACPI_TYPE_INTEGER);
 946         if (!obj) {
 947                 dev_err(&client->dev, "Error _DSM call to get HID descriptor address failed\n");
 948                 return -ENODEV;
 949         }
 950
 951         pdata->hid_descriptor_address = obj->integer.value;
 952         ACPI_FREE(obj);
 953
 954         return 0;
 955 }
 956
 957 static void i2c_hid_acpi_fix_up_power(struct device *dev)
 958 {
 959         struct acpi_device *adev;
 960
 961         adev = ACPI_COMPANION(dev);
 962         if (adev)
 963                 acpi_device_fix_up_power(adev);
 964 }
 965
 966 static const struct acpi_device_id i2c_hid_acpi_match[] = {
 967         {"ACPI0C50", 0 },
 968         {"PNP0C50", 0 },
 969         { },
 970 };
 971 MODULE_DEVICE_TABLE(acpi, i2c_hid_acpi_match);
 972 #else
 973 static inline int i2c_hid_acpi_pdata(struct i2c_client *client,
 974                 struct i2c_hid_platform_data *pdata)
 975 {
 976         return -ENODEV;
 977 }
 978
 979 static inline void i2c_hid_acpi_fix_up_power(struct device *dev) {}
 980 #endif
 981
 982 #ifdef CONFIG_OF
 983 static int i2c_hid_of_probe(struct i2c_client *client,
 984                 struct i2c_hid_platform_data *pdata)
 985 {
 986         struct device *dev = &client->dev;
 987         u32 val;
 988         int ret;
 989
 990         ret = of_property_read_u32(dev->of_node, "hid-descr-addr", &val);
 991         if (ret) {
 992                 dev_err(&client->dev, "HID register address not provided\n");
 993                 return -ENODEV;
 994         }
 995         if (val >> 16) {
 996                 dev_err(&client->dev, "Bad HID register address: 0x%08x\n",
 997                         val);
 998                 return -EINVAL;
 999         }
1000         pdata->hid_descriptor_address = val;
1001
1002         return 0;
1003 }
1004
1005 static const struct of_device_id i2c_hid_of_match[] = {
1006         { .compatible = "hid-over-i2c" },
1007         {},
1008 };
1009 MODULE_DEVICE_TABLE(of, i2c_hid_of_match);
1010 #else
1011 static inline int i2c_hid_of_probe(struct i2c_client *client,
1012                 struct i2c_hid_platform_data *pdata)
1013 {
1014         return -ENODEV;
1015 }
1016 #endif
1017
1018 static void i2c_hid_fwnode_probe(struct i2c_client *client,
1019                                  struct i2c_hid_platform_data *pdata)
1020 {
1021         u32 val;
1022
1023         if (!device_property_read_u32(&client->dev, "post-power-on-delay-ms",
1024                                       &val))
1025                 pdata->post_power_delay_ms = val;
1026 }
1027
1028 static int i2c_hid_probe(struct i2c_client *client,
1029                          const struct i2c_device_id *dev_id)
1030 {
1031         int ret;
1032         struct i2c_hid *ihid;
1033         struct hid_device *hid;
1034         __u16 hidRegister;
1035         struct i2c_hid_platform_data *platform_data = client->dev.platform_data;
1036
1037         dbg_hid("HID probe called for i2c 0x%02x\n", client->addr);
1038
1039         if (!client->irq) {
1040                 dev_err(&client->dev,
1041                         "HID over i2c has not been provided an Int IRQ\n");
1042                 return -EINVAL;
1043         }
1044
1045         if (client->irq < 0) {
1046                 if (client->irq != -EPROBE_DEFER)
1047                         dev_err(&client->dev,
1048                                 "HID over i2c doesn't have a valid IRQ\n");
1049                 return client->irq;
1050         }
1051
1052         ihid = devm_kzalloc(&client->dev, sizeof(*ihid), GFP_KERNEL);
1053         if (!ihid)
1054                 return -ENOMEM;
1055
1056         if (client->dev.of_node) {
1057                 ret = i2c_hid_of_probe(client, &ihid->pdata);
1058                 if (ret)
1059                         return ret;
1060         } else if (!platform_data) {
1061                 ret = i2c_hid_acpi_pdata(client, &ihid->pdata);
1062                 if (ret)
1063                         return ret;
1064         } else {
1065                 ihid->pdata = *platform_data;
1066         }
1067
1068         /* Parse platform agnostic common properties from ACPI / device tree */
1069         i2c_hid_fwnode_probe(client, &ihid->pdata);
1070
1071         ihid->pdata.supplies[0].supply = "vdd";
1072         ihid->pdata.supplies[1].supply = "vddl";
1073
1074         ret = devm_regulator_bulk_get(&client->dev,
1075                                       ARRAY_SIZE(ihid->pdata.supplies),
1076                                       ihid->pdata.supplies);
1077         if (ret)
1078                 return ret;
1079
1080         ret = regulator_bulk_enable(ARRAY_SIZE(ihid->pdata.supplies),
1081                                     ihid->pdata.supplies);
1082         if (ret < 0)
1083                 return ret;
1084
1085         if (ihid->pdata.post_power_delay_ms)
1086                 msleep(ihid->pdata.post_power_delay_ms);
1087
1088         i2c_set_clientdata(client, ihid);
1089
1090         ihid->client = client;
1091
1092         hidRegister = ihid->pdata.hid_descriptor_address;
1093         ihid->wHIDDescRegister = cpu_to_le16(hidRegister);
1094
1095         init_waitqueue_head(&ihid->wait);
1096         mutex_init(&ihid->reset_lock);
1097
1098         /* we need to allocate the command buffer without knowing the maximum
1099          * size of the reports. Let's use HID_MIN_BUFFER_SIZE, then we do the
1100          * real computation later. */
1101         ret = i2c_hid_alloc_buffers(ihid, HID_MIN_BUFFER_SIZE);
1102         if (ret < 0)
1103                 goto err_regulator;
1104
1105         i2c_hid_acpi_fix_up_power(&client->dev);
1106
1107         pm_runtime_get_noresume(&client->dev);
1108         pm_runtime_set_active(&client->dev);
1109         pm_runtime_enable(&client->dev);
1110         device_enable_async_suspend(&client->dev);
1111
1112         /* Make sure there is something at this address */
1113         ret = i2c_smbus_read_byte(client);
1114         if (ret < 0) {
1115                 dev_dbg(&client->dev, "nothing at this address: %d\n", ret);
1116                 ret = -ENXIO;
1117                 goto err_pm;
1118         }
1119
1120         ret = i2c_hid_fetch_hid_descriptor(ihid);
1121         if (ret < 0)
1122                 goto err_pm;
1123
1124         ret = i2c_hid_init_irq(client);
1125         if (ret < 0)
1126                 goto err_pm;
1127
1128         hid = hid_allocate_device();
1129         if (IS_ERR(hid)) {
1130                 ret = PTR_ERR(hid);
1131                 goto err_irq;
1132         }
1133
1134         ihid->hid = hid;
1135
1136         hid->driver_data = client;
1137         hid->ll_driver = &i2c_hid_ll_driver;
1138         hid->dev.parent = &client->dev;
1139         hid->bus = BUS_I2C;
1140         hid->version = le16_to_cpu(ihid->hdesc.bcdVersion);
1141         hid->vendor = le16_to_cpu(ihid->hdesc.wVendorID);
1142         hid->product = le16_to_cpu(ihid->hdesc.wProductID);
1143
1144         snprintf(hid->name, sizeof(hid->name), "%s %04hX:%04hX",
1145                  client->name, hid->vendor, hid->product);
1146         strlcpy(hid->phys, dev_name(&client->dev), sizeof(hid->phys));
1147
1148         ihid->quirks = i2c_hid_lookup_quirk(hid->vendor, hid->product);
1149
1150         ret = hid_add_device(hid);
1151         if (ret) {
1152                 if (ret != -ENODEV)
1153                         hid_err(client, "can't add hid device: %d\n", ret);
1154                 goto err_mem_free;
1155         }
1156
1157         if (!(ihid->quirks & I2C_HID_QUIRK_NO_RUNTIME_PM))
1158                 pm_runtime_put(&client->dev);
1159
1160         return 0;
1161
1162 err_mem_free:
1163         hid_destroy_device(hid);
1164
1165 err_irq:
1166         free_irq(client->irq, ihid);
1167
1168 err_pm:
1169         pm_runtime_put_noidle(&client->dev);
1170         pm_runtime_disable(&client->dev);
1171
1172 err_regulator:
1173         regulator_bulk_disable(ARRAY_SIZE(ihid->pdata.supplies),
1174                                ihid->pdata.supplies);
1175         i2c_hid_free_buffers(ihid);
1176         return ret;
1177 }
1178
1179 static int i2c_hid_remove(struct i2c_client *client)
1180 {
1181         struct i2c_hid *ihid = i2c_get_clientdata(client);
1182         struct hid_device *hid;
1183
1184         if (!(ihid->quirks & I2C_HID_QUIRK_NO_RUNTIME_PM))
1185                 pm_runtime_get_sync(&client->dev);
1186         pm_runtime_disable(&client->dev);
1187         pm_runtime_set_suspended(&client->dev);
1188         pm_runtime_put_noidle(&client->dev);
1189
1190         hid = ihid->hid;
1191         hid_destroy_device(hid);
1192
1193         free_irq(client->irq, ihid);
1194
1195         if (ihid->bufsize)
1196                 i2c_hid_free_buffers(ihid);
1197
1198         regulator_bulk_disable(ARRAY_SIZE(ihid->pdata.supplies),
1199                                ihid->pdata.supplies);
1200
1201         return 0;
1202 }
1203
1204 static void i2c_hid_shutdown(struct i2c_client *client)
1205 {
1206         struct i2c_hid *ihid = i2c_get_clientdata(client);
1207
1208         i2c_hid_set_power(client, I2C_HID_PWR_SLEEP);
1209         free_irq(client->irq, ihid);
1210 }
1211
1212 #ifdef CONFIG_PM_SLEEP
1213 static int i2c_hid_suspend(struct device *dev)
1214 {
1215         struct i2c_client *client = to_i2c_client(dev);
1216         struct i2c_hid *ihid = i2c_get_clientdata(client);
1217         struct hid_device *hid = ihid->hid;
1218         int ret;
1219         int wake_status;
1220
1221         if (hid->driver && hid->driver->suspend) {
1222                 /*
1223                  * Wake up the device so that IO issues in
1224                  * HID driver's suspend code can succeed.
1225                  */
1226                 ret = pm_runtime_resume(dev);
1227                 if (ret < 0)
1228                         return ret;
1229
1230                 ret = hid->driver->suspend(hid, PMSG_SUSPEND);
1231                 if (ret < 0)
1232                         return ret;
1233         }
1234
1235         if (!pm_runtime_suspended(dev)) {
1236                 /* Save some power */
1237                 i2c_hid_set_power(client, I2C_HID_PWR_SLEEP);
1238
1239                 disable_irq(client->irq);
1240         }
1241
1242         if (device_may_wakeup(&client->dev)) {
1243                 wake_status = enable_irq_wake(client->irq);
1244                 if (!wake_status)
1245                         ihid->irq_wake_enabled = true;
1246                 else
1247                         hid_warn(hid, "Failed to enable irq wake: %d\n",
1248                                 wake_status);
1249         } else {
1250                 regulator_bulk_disable(ARRAY_SIZE(ihid->pdata.supplies),
1251                                        ihid->pdata.supplies);
1252         }
1253
1254         return 0;
1255 }
1256
1257 static int i2c_hid_resume(struct device *dev)
1258 {
1259         int ret;
1260         struct i2c_client *client = to_i2c_client(dev);
1261         struct i2c_hid *ihid = i2c_get_clientdata(client);
1262         struct hid_device *hid = ihid->hid;
1263         int wake_status;
1264
1265         if (!device_may_wakeup(&client->dev)) {
1266                 ret = regulator_bulk_enable(ARRAY_SIZE(ihid->pdata.supplies),
1267                                             ihid->pdata.supplies);
1268                 if (ret)
1269                         hid_warn(hid, "Failed to enable supplies: %d\n", ret);
1270
1271                 if (ihid->pdata.post_power_delay_ms)
1272                         msleep(ihid->pdata.post_power_delay_ms);
1273         } else if (ihid->irq_wake_enabled) {
1274                 wake_status = disable_irq_wake(client->irq);
1275                 if (!wake_status)
1276                         ihid->irq_wake_enabled = false;
1277                 else
1278                         hid_warn(hid, "Failed to disable irq wake: %d\n",
1279                                 wake_status);
1280         }
1281
1282         /* We'll resume to full power */
1283         pm_runtime_disable(dev);
1284         pm_runtime_set_active(dev);
1285         pm_runtime_enable(dev);
1286
1287         enable_irq(client->irq);
1288
1289         /* Instead of resetting device, simply powers the device on. This
1290          * solves "incomplete reports" on Raydium devices 2386:3118 and
1291          * 2386:4B33 and fixes various SIS touchscreens no longer sending
1292          * data after a suspend/resume.
1293          */
1294         ret = i2c_hid_set_power(client, I2C_HID_PWR_ON);
1295         if (ret)
1296                 return ret;
1297
1298         if (hid->driver && hid->driver->reset_resume) {
1299                 ret = hid->driver->reset_resume(hid);
1300                 return ret;
1301         }
1302
1303         return 0;
1304 }
1305 #endif
1306
1307 #ifdef CONFIG_PM
1308 static int i2c_hid_runtime_suspend(struct device *dev)
1309 {
1310         struct i2c_client *client = to_i2c_client(dev);
1311
1312         i2c_hid_set_power(client, I2C_HID_PWR_SLEEP);
1313         disable_irq(client->irq);
1314         return 0;
1315 }
1316
1317 static int i2c_hid_runtime_resume(struct device *dev)
1318 {
1319         struct i2c_client *client = to_i2c_client(dev);
1320
1321         enable_irq(client->irq);
1322         i2c_hid_set_power(client, I2C_HID_PWR_ON);
1323         return 0;
1324 }
1325 #endif
1326
1327 static const struct dev_pm_ops i2c_hid_pm = {
1328         SET_SYSTEM_SLEEP_PM_OPS(i2c_hid_suspend, i2c_hid_resume)
1329         SET_RUNTIME_PM_OPS(i2c_hid_runtime_suspend, i2c_hid_runtime_resume,
1330                            NULL)
1331 };
1332
1333 static const struct i2c_device_id i2c_hid_id_table[] = {
1334         { "hid", 0 },
1335         { "hid-over-i2c", 0 },
1336         { },
1337 };
1338 MODULE_DEVICE_TABLE(i2c, i2c_hid_id_table);
1339
1340
1341 static struct i2c_driver i2c_hid_driver = {
1342         .driver = {
1343                 .name   = "i2c_hid",
1344                 .pm     = &i2c_hid_pm,
1345                 .acpi_match_table = ACPI_PTR(i2c_hid_acpi_match),
1346                 .of_match_table = of_match_ptr(i2c_hid_of_match),
1347         },
1348
1349         .probe          = i2c_hid_probe,
1350         .remove         = i2c_hid_remove,
1351         .shutdown       = i2c_hid_shutdown,
1352         .id_table       = i2c_hid_id_table,
1353 };
1354
1355 module_i2c_driver(i2c_hid_driver);
1356
1357 MODULE_DESCRIPTION("HID over I2C core driver");
1358 MODULE_AUTHOR("Benjamin Tissoires <benjamin.tissoires@gmail.com>");
1359 MODULE_LICENSE("GPL");