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, USB_DEVICE_ID_WEIDA_8752,
 173                 I2C_HID_QUIRK_SET_PWR_WAKEUP_DEV },
 174         { USB_VENDOR_ID_WEIDA, USB_DEVICE_ID_WEIDA_8755,
 175                 I2C_HID_QUIRK_SET_PWR_WAKEUP_DEV },
 176         { I2C_VENDOR_ID_HANTICK, I2C_PRODUCT_ID_HANTICK_5288,
 177                 I2C_HID_QUIRK_NO_IRQ_AFTER_RESET |
 178                 I2C_HID_QUIRK_NO_RUNTIME_PM },
 179         { I2C_VENDOR_ID_RAYDIUM, I2C_PRODUCT_ID_RAYDIUM_4B33,
 180                 I2C_HID_QUIRK_DELAY_AFTER_SLEEP },
 181         { USB_VENDOR_ID_LG, I2C_DEVICE_ID_LG_8001,
 182                 I2C_HID_QUIRK_NO_RUNTIME_PM },
 183         { I2C_VENDOR_ID_GOODIX, I2C_DEVICE_ID_GOODIX_01F0,
 184                 I2C_HID_QUIRK_NO_RUNTIME_PM },
 185         { USB_VENDOR_ID_ELAN, HID_ANY_ID,
 186                  I2C_HID_QUIRK_BOGUS_IRQ },
 187         { USB_VENDOR_ID_SYNAPTICS, I2C_DEVICE_ID_SYNAPTICS_7E7E,
 188                 I2C_HID_QUIRK_NO_RUNTIME_PM },
 189         { 0, 0 }
 190 };
 191
 192 /*
 193  * i2c_hid_lookup_quirk: return any quirks associated with a I2C HID device
 194  * @idVendor: the 16-bit vendor ID
 195  * @idProduct: the 16-bit product ID
 196  *
 197  * Returns: a u32 quirks value.
 198  */
 199 static u32 i2c_hid_lookup_quirk(const u16 idVendor, const u16 idProduct)
 200 {
 201         u32 quirks = 0;
 202         int n;
 203
 204         for (n = 0; i2c_hid_quirks[n].idVendor; n++)
 205                 if (i2c_hid_quirks[n].idVendor == idVendor &&
 206                     (i2c_hid_quirks[n].idProduct == (__u16)HID_ANY_ID ||
 207                      i2c_hid_quirks[n].idProduct == idProduct))
 208                         quirks = i2c_hid_quirks[n].quirks;
 209
 210         return quirks;
 211 }
 212
 213 static int __i2c_hid_command(struct i2c_client *client,
 214                 const struct i2c_hid_cmd *command, u8 reportID,
 215                 u8 reportType, u8 *args, int args_len,
 216                 unsigned char *buf_recv, int data_len)
 217 {
 218         struct i2c_hid *ihid = i2c_get_clientdata(client);
 219         union command *cmd = (union command *)ihid->cmdbuf;
 220         int ret;
 221         struct i2c_msg msg[2];
 222         int msg_num = 1;
 223
 224         int length = command->length;
 225         bool wait = command->wait;
 226         unsigned int registerIndex = command->registerIndex;
 227
 228         /* special case for hid_descr_cmd */
 229         if (command == &hid_descr_cmd) {
 230                 cmd->c.reg = ihid->wHIDDescRegister;
 231         } else {
 232                 cmd->data[0] = ihid->hdesc_buffer[registerIndex];
 233                 cmd->data[1] = ihid->hdesc_buffer[registerIndex + 1];
 234         }
 235
 236         if (length > 2) {
 237                 cmd->c.opcode = command->opcode;
 238                 cmd->c.reportTypeID = reportID | reportType << 4;
 239         }
 240
 241         memcpy(cmd->data + length, args, args_len);
 242         length += args_len;
 243
 244         i2c_hid_dbg(ihid, "%s: cmd=%*ph\n", __func__, length, cmd->data);
 245
 246         msg[0].addr = client->addr;
 247         msg[0].flags = client->flags & I2C_M_TEN;
 248         msg[0].len = length;
 249         msg[0].buf = cmd->data;
 250         if (data_len > 0) {
 251                 msg[1].addr = client->addr;
 252                 msg[1].flags = client->flags & I2C_M_TEN;
 253                 msg[1].flags |= I2C_M_RD;
 254                 msg[1].len = data_len;
 255                 msg[1].buf = buf_recv;
 256                 msg_num = 2;
 257                 set_bit(I2C_HID_READ_PENDING, &ihid->flags);
 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 (data_len > 0)
 266                 clear_bit(I2C_HID_READ_PENDING, &ihid->flags);
 267
 268         if (ret != msg_num)
 269                 return ret < 0 ? ret : -EIO;
 270
 271         ret = 0;
 272
 273         if (wait && (ihid->quirks & I2C_HID_QUIRK_NO_IRQ_AFTER_RESET)) {
 274                 msleep(100);
 275         } else if (wait) {
 276                 i2c_hid_dbg(ihid, "%s: waiting...\n", __func__);
 277                 if (!wait_event_timeout(ihid->wait,
 278                                 !test_bit(I2C_HID_RESET_PENDING, &ihid->flags),
 279                                 msecs_to_jiffies(5000)))
 280                         ret = -ENODATA;
 281                 i2c_hid_dbg(ihid, "%s: finished.\n", __func__);
 282         }
 283
 284         return ret;
 285 }
 286
 287 static int i2c_hid_command(struct i2c_client *client,
 288                 const struct i2c_hid_cmd *command,
 289                 unsigned char *buf_recv, int data_len)
 290 {
 291         return __i2c_hid_command(client, command, 0, 0, NULL, 0,
 292                                 buf_recv, data_len);
 293 }
 294
 295 static int i2c_hid_get_report(struct i2c_client *client, u8 reportType,
 296                 u8 reportID, unsigned char *buf_recv, int data_len)
 297 {
 298         struct i2c_hid *ihid = i2c_get_clientdata(client);
 299         u8 args[3];
 300         int ret;
 301         int args_len = 0;
 302         u16 readRegister = le16_to_cpu(ihid->hdesc.wDataRegister);
 303
 304         i2c_hid_dbg(ihid, "%s\n", __func__);
 305
 306         if (reportID >= 0x0F) {
 307                 args[args_len++] = reportID;
 308                 reportID = 0x0F;
 309         }
 310
 311         args[args_len++] = readRegister & 0xFF;
 312         args[args_len++] = readRegister >> 8;
 313
 314         ret = __i2c_hid_command(client, &hid_get_report_cmd, reportID,
 315                 reportType, args, args_len, buf_recv, data_len);
 316         if (ret) {
 317                 dev_err(&client->dev,
 318                         "failed to retrieve report from device.\n");
 319                 return ret;
 320         }
 321
 322         return 0;
 323 }
 324
 325 /**
 326  * i2c_hid_set_or_send_report: forward an incoming report to the device
 327  * @client: the i2c_client of the device
 328  * @reportType: 0x03 for HID_FEATURE_REPORT ; 0x02 for HID_OUTPUT_REPORT
 329  * @reportID: the report ID
 330  * @buf: the actual data to transfer, without the report ID
 331  * @len: size of buf
 332  * @use_data: true: use SET_REPORT HID command, false: send plain OUTPUT report
 333  */
 334 static int i2c_hid_set_or_send_report(struct i2c_client *client, u8 reportType,
 335                 u8 reportID, unsigned char *buf, size_t data_len, bool use_data)
 336 {
 337         struct i2c_hid *ihid = i2c_get_clientdata(client);
 338         u8 *args = ihid->argsbuf;
 339         const struct i2c_hid_cmd *hidcmd;
 340         int ret;
 341         u16 dataRegister = le16_to_cpu(ihid->hdesc.wDataRegister);
 342         u16 outputRegister = le16_to_cpu(ihid->hdesc.wOutputRegister);
 343         u16 maxOutputLength = le16_to_cpu(ihid->hdesc.wMaxOutputLength);
 344         u16 size;
 345         int args_len;
 346         int index = 0;
 347
 348         i2c_hid_dbg(ihid, "%s\n", __func__);
 349
 350         if (data_len > ihid->bufsize)
 351                 return -EINVAL;
 352
 353         size =          2                       /* size */ +
 354                         (reportID ? 1 : 0)      /* reportID */ +
 355                         data_len                /* buf */;
 356         args_len =      (reportID >= 0x0F ? 1 : 0) /* optional third byte */ +
 357                         2                       /* dataRegister */ +
 358                         size                    /* args */;
 359
 360         if (!use_data && maxOutputLength == 0)
 361                 return -ENOSYS;
 362
 363         if (reportID >= 0x0F) {
 364                 args[index++] = reportID;
 365                 reportID = 0x0F;
 366         }
 367
 368         /*
 369          * use the data register for feature reports or if the device does not
 370          * support the output register
 371          */
 372         if (use_data) {
 373                 args[index++] = dataRegister & 0xFF;
 374                 args[index++] = dataRegister >> 8;
 375                 hidcmd = &hid_set_report_cmd;
 376         } else {
 377                 args[index++] = outputRegister & 0xFF;
 378                 args[index++] = outputRegister >> 8;
 379                 hidcmd = &hid_no_cmd;
 380         }
 381
 382         args[index++] = size & 0xFF;
 383         args[index++] = size >> 8;
 384
 385         if (reportID)
 386                 args[index++] = reportID;
 387
 388         memcpy(&args[index], buf, data_len);
 389
 390         ret = __i2c_hid_command(client, hidcmd, reportID,
 391                 reportType, args, args_len, NULL, 0);
 392         if (ret) {
 393                 dev_err(&client->dev, "failed to set a report to device.\n");
 394                 return ret;
 395         }
 396
 397         return data_len;
 398 }
 399
 400 static int i2c_hid_set_power(struct i2c_client *client, int power_state)
 401 {
 402         struct i2c_hid *ihid = i2c_get_clientdata(client);
 403         int ret;
 404         unsigned long now, delay;
 405
 406         i2c_hid_dbg(ihid, "%s\n", __func__);
 407
 408         /*
 409          * Some devices require to send a command to wakeup before power on.
 410          * The call will get a return value (EREMOTEIO) but device will be
 411          * triggered and activated. After that, it goes like a normal device.
 412          */
 413         if (power_state == I2C_HID_PWR_ON &&
 414             ihid->quirks & I2C_HID_QUIRK_SET_PWR_WAKEUP_DEV) {
 415                 ret = i2c_hid_command(client, &hid_set_power_cmd, NULL, 0);
 416
 417                 /* Device was already activated */
 418                 if (!ret)
 419                         goto set_pwr_exit;
 420         }
 421
 422         if (ihid->quirks & I2C_HID_QUIRK_DELAY_AFTER_SLEEP &&
 423             power_state == I2C_HID_PWR_ON) {
 424                 now = jiffies;
 425                 if (time_after(ihid->sleep_delay, now)) {
 426                         delay = jiffies_to_usecs(ihid->sleep_delay - now);
 427                         usleep_range(delay, delay + 1);
 428                 }
 429         }
 430
 431         ret = __i2c_hid_command(client, &hid_set_power_cmd, power_state,
 432                 0, NULL, 0, NULL, 0);
 433
 434         if (ihid->quirks & I2C_HID_QUIRK_DELAY_AFTER_SLEEP &&
 435             power_state == I2C_HID_PWR_SLEEP)
 436                 ihid->sleep_delay = jiffies + msecs_to_jiffies(20);
 437
 438         if (ret)
 439                 dev_err(&client->dev, "failed to change power setting.\n");
 440
 441 set_pwr_exit:
 442         return ret;
 443 }
 444
 445 static int i2c_hid_hwreset(struct i2c_client *client)
 446 {
 447         struct i2c_hid *ihid = i2c_get_clientdata(client);
 448         int ret;
 449
 450         i2c_hid_dbg(ihid, "%s\n", __func__);
 451
 452         /*
 453          * This prevents sending feature reports while the device is
 454          * being reset. Otherwise we may lose the reset complete
 455          * interrupt.
 456          */
 457         mutex_lock(&ihid->reset_lock);
 458
 459         ret = i2c_hid_set_power(client, I2C_HID_PWR_ON);
 460         if (ret)
 461                 goto out_unlock;
 462
 463         /*
 464          * The HID over I2C specification states that if a DEVICE needs time
 465          * after the PWR_ON request, it should utilise CLOCK stretching.
 466          * However, it has been observered that the Windows driver provides a
 467          * 1ms sleep between the PWR_ON and RESET requests and that some devices
 468          * rely on this.
 469          */
 470         usleep_range(1000, 5000);
 471
 472         i2c_hid_dbg(ihid, "resetting...\n");
 473
 474         ret = i2c_hid_command(client, &hid_reset_cmd, NULL, 0);
 475         if (ret) {
 476                 dev_err(&client->dev, "failed to reset device.\n");
 477                 i2c_hid_set_power(client, I2C_HID_PWR_SLEEP);
 478         }
 479
 480 out_unlock:
 481         mutex_unlock(&ihid->reset_lock);
 482         return ret;
 483 }
 484
 485 static void i2c_hid_get_input(struct i2c_hid *ihid)
 486 {
 487         int ret;
 488         u32 ret_size;
 489         int size = le16_to_cpu(ihid->hdesc.wMaxInputLength);
 490
 491         if (size > ihid->bufsize)
 492                 size = ihid->bufsize;
 493
 494         ret = i2c_master_recv(ihid->client, ihid->inbuf, size);
 495         if (ret != size) {
 496                 if (ret < 0)
 497                         return;
 498
 499                 dev_err(&ihid->client->dev, "%s: got %d data instead of %d\n",
 500                         __func__, ret, size);
 501                 return;
 502         }
 503
 504         ret_size = ihid->inbuf[0] | ihid->inbuf[1] << 8;
 505
 506         if (!ret_size) {
 507                 /* host or device initiated RESET completed */
 508                 if (test_and_clear_bit(I2C_HID_RESET_PENDING, &ihid->flags))
 509                         wake_up(&ihid->wait);
 510                 return;
 511         }
 512
 513         if (ihid->quirks & I2C_HID_QUIRK_BOGUS_IRQ && ret_size == 0xffff) {
 514                 dev_warn_once(&ihid->client->dev, "%s: IRQ triggered but "
 515                               "there's no data\n", __func__);
 516                 return;
 517         }
 518
 519         if ((ret_size > size) || (ret_size < 2)) {
 520                 dev_err(&ihid->client->dev, "%s: incomplete report (%d/%d)\n",
 521                         __func__, size, ret_size);
 522                 return;
 523         }
 524
 525         i2c_hid_dbg(ihid, "input: %*ph\n", ret_size, ihid->inbuf);
 526
 527         if (test_bit(I2C_HID_STARTED, &ihid->flags))
 528                 hid_input_report(ihid->hid, HID_INPUT_REPORT, ihid->inbuf + 2,
 529                                 ret_size - 2, 1);
 530
 531         return;
 532 }
 533
 534 static irqreturn_t i2c_hid_irq(int irq, void *dev_id)
 535 {
 536         struct i2c_hid *ihid = dev_id;
 537
 538         if (test_bit(I2C_HID_READ_PENDING, &ihid->flags))
 539                 return IRQ_HANDLED;
 540
 541         i2c_hid_get_input(ihid);
 542
 543         return IRQ_HANDLED;
 544 }
 545
 546 static int i2c_hid_get_report_length(struct hid_report *report)
 547 {
 548         return ((report->size - 1) >> 3) + 1 +
 549                 report->device->report_enum[report->type].numbered + 2;
 550 }
 551
 552 /*
 553  * Traverse the supplied list of reports and find the longest
 554  */
 555 static void i2c_hid_find_max_report(struct hid_device *hid, unsigned int type,
 556                 unsigned int *max)
 557 {
 558         struct hid_report *report;
 559         unsigned int size;
 560
 561         /* We should not rely on wMaxInputLength, as some devices may set it to
 562          * a wrong length. */
 563         list_for_each_entry(report, &hid->report_enum[type].report_list, list) {
 564                 size = i2c_hid_get_report_length(report);
 565                 if (*max < size)
 566                         *max = size;
 567         }
 568 }
 569
 570 static void i2c_hid_free_buffers(struct i2c_hid *ihid)
 571 {
 572         kfree(ihid->inbuf);
 573         kfree(ihid->rawbuf);
 574         kfree(ihid->argsbuf);
 575         kfree(ihid->cmdbuf);
 576         ihid->inbuf = NULL;
 577         ihid->rawbuf = NULL;
 578         ihid->cmdbuf = NULL;
 579         ihid->argsbuf = NULL;
 580         ihid->bufsize = 0;
 581 }
 582
 583 static int i2c_hid_alloc_buffers(struct i2c_hid *ihid, size_t report_size)
 584 {
 585         /* the worst case is computed from the set_report command with a
 586          * reportID > 15 and the maximum report length */
 587         int args_len = sizeof(__u8) + /* ReportID */
 588                        sizeof(__u8) + /* optional ReportID byte */
 589                        sizeof(__u16) + /* data register */
 590                        sizeof(__u16) + /* size of the report */
 591                        report_size; /* report */
 592
 593         ihid->inbuf = kzalloc(report_size, GFP_KERNEL);
 594         ihid->rawbuf = kzalloc(report_size, GFP_KERNEL);
 595         ihid->argsbuf = kzalloc(args_len, GFP_KERNEL);
 596         ihid->cmdbuf = kzalloc(sizeof(union command) + args_len, GFP_KERNEL);
 597
 598         if (!ihid->inbuf || !ihid->rawbuf || !ihid->argsbuf || !ihid->cmdbuf) {
 599                 i2c_hid_free_buffers(ihid);
 600                 return -ENOMEM;
 601         }
 602
 603         ihid->bufsize = report_size;
 604
 605         return 0;
 606 }
 607
 608 static int i2c_hid_get_raw_report(struct hid_device *hid,
 609                 unsigned char report_number, __u8 *buf, size_t count,
 610                 unsigned char report_type)
 611 {
 612         struct i2c_client *client = hid->driver_data;
 613         struct i2c_hid *ihid = i2c_get_clientdata(client);
 614         size_t ret_count, ask_count;
 615         int ret;
 616
 617         if (report_type == HID_OUTPUT_REPORT)
 618                 return -EINVAL;
 619
 620         /* +2 bytes to include the size of the reply in the query buffer */
 621         ask_count = min(count + 2, (size_t)ihid->bufsize);
 622
 623         ret = i2c_hid_get_report(client,
 624                         report_type == HID_FEATURE_REPORT ? 0x03 : 0x01,
 625                         report_number, ihid->rawbuf, ask_count);
 626
 627         if (ret < 0)
 628                 return ret;
 629
 630         ret_count = ihid->rawbuf[0] | (ihid->rawbuf[1] << 8);
 631
 632         if (ret_count <= 2)
 633                 return 0;
 634
 635         ret_count = min(ret_count, ask_count);
 636
 637         /* The query buffer contains the size, dropping it in the reply */
 638         count = min(count, ret_count - 2);
 639         memcpy(buf, ihid->rawbuf + 2, count);
 640
 641         return count;
 642 }
 643
 644 static int i2c_hid_output_raw_report(struct hid_device *hid, __u8 *buf,
 645                 size_t count, unsigned char report_type, bool use_data)
 646 {
 647         struct i2c_client *client = hid->driver_data;
 648         struct i2c_hid *ihid = i2c_get_clientdata(client);
 649         int report_id = buf[0];
 650         int ret;
 651
 652         if (report_type == HID_INPUT_REPORT)
 653                 return -EINVAL;
 654
 655         mutex_lock(&ihid->reset_lock);
 656
 657         if (report_id) {
 658                 buf++;
 659                 count--;
 660         }
 661
 662         ret = i2c_hid_set_or_send_report(client,
 663                                 report_type == HID_FEATURE_REPORT ? 0x03 : 0x02,
 664                                 report_id, buf, count, use_data);
 665
 666         if (report_id && ret >= 0)
 667                 ret++; /* add report_id to the number of transfered bytes */
 668
 669         mutex_unlock(&ihid->reset_lock);
 670
 671         return ret;
 672 }
 673
 674 static int i2c_hid_output_report(struct hid_device *hid, __u8 *buf,
 675                 size_t count)
 676 {
 677         return i2c_hid_output_raw_report(hid, buf, count, HID_OUTPUT_REPORT,
 678                         false);
 679 }
 680
 681 static int i2c_hid_raw_request(struct hid_device *hid, unsigned char reportnum,
 682                                __u8 *buf, size_t len, unsigned char rtype,
 683                                int reqtype)
 684 {
 685         switch (reqtype) {
 686         case HID_REQ_GET_REPORT:
 687                 return i2c_hid_get_raw_report(hid, reportnum, buf, len, rtype);
 688         case HID_REQ_SET_REPORT:
 689                 if (buf[0] != reportnum)
 690                         return -EINVAL;
 691                 return i2c_hid_output_raw_report(hid, buf, len, rtype, true);
 692         default:
 693                 return -EIO;
 694         }
 695 }
 696
 697 static int i2c_hid_parse(struct hid_device *hid)
 698 {
 699         struct i2c_client *client = hid->driver_data;
 700         struct i2c_hid *ihid = i2c_get_clientdata(client);
 701         struct i2c_hid_desc *hdesc = &ihid->hdesc;
 702         unsigned int rsize;
 703         char *rdesc;
 704         int ret;
 705         int tries = 3;
 706         char *use_override;
 707
 708         i2c_hid_dbg(ihid, "entering %s\n", __func__);
 709
 710         rsize = le16_to_cpu(hdesc->wReportDescLength);
 711         if (!rsize || rsize > HID_MAX_DESCRIPTOR_SIZE) {
 712                 dbg_hid("weird size of report descriptor (%u)\n", rsize);
 713                 return -EINVAL;
 714         }
 715
 716         do {
 717                 ret = i2c_hid_hwreset(client);
 718                 if (ret)
 719                         msleep(1000);
 720         } while (tries-- > 0 && ret);
 721
 722         if (ret)
 723                 return ret;
 724
 725         use_override = i2c_hid_get_dmi_hid_report_desc_override(client->name,
 726                                                                 &rsize);
 727
 728         if (use_override) {
 729                 rdesc = use_override;
 730                 i2c_hid_dbg(ihid, "Using a HID report descriptor override\n");
 731         } else {
 732                 rdesc = kzalloc(rsize, GFP_KERNEL);
 733
 734                 if (!rdesc) {
 735                         dbg_hid("couldn't allocate rdesc memory\n");
 736                         return -ENOMEM;
 737                 }
 738
 739                 i2c_hid_dbg(ihid, "asking HID report descriptor\n");
 740
 741                 ret = i2c_hid_command(client, &hid_report_descr_cmd,
 742                                       rdesc, rsize);
 743                 if (ret) {
 744                         hid_err(hid, "reading report descriptor failed\n");
 745                         kfree(rdesc);
 746                         return -EIO;
 747                 }
 748         }
 749
 750         i2c_hid_dbg(ihid, "Report Descriptor: %*ph\n", rsize, rdesc);
 751
 752         ret = hid_parse_report(hid, rdesc, rsize);
 753         if (!use_override)
 754                 kfree(rdesc);
 755
 756         if (ret) {
 757                 dbg_hid("parsing report descriptor failed\n");
 758                 return ret;
 759         }
 760
 761         return 0;
 762 }
 763
 764 static int i2c_hid_start(struct hid_device *hid)
 765 {
 766         struct i2c_client *client = hid->driver_data;
 767         struct i2c_hid *ihid = i2c_get_clientdata(client);
 768         int ret;
 769         unsigned int bufsize = HID_MIN_BUFFER_SIZE;
 770
 771         i2c_hid_find_max_report(hid, HID_INPUT_REPORT, &bufsize);
 772         i2c_hid_find_max_report(hid, HID_OUTPUT_REPORT, &bufsize);
 773         i2c_hid_find_max_report(hid, HID_FEATURE_REPORT, &bufsize);
 774
 775         if (bufsize > ihid->bufsize) {
 776                 disable_irq(client->irq);
 777                 i2c_hid_free_buffers(ihid);
 778
 779                 ret = i2c_hid_alloc_buffers(ihid, bufsize);
 780                 enable_irq(client->irq);
 781
 782                 if (ret)
 783                         return ret;
 784         }
 785
 786         return 0;
 787 }
 788
 789 static void i2c_hid_stop(struct hid_device *hid)
 790 {
 791         hid->claimed = 0;
 792 }
 793
 794 static int i2c_hid_open(struct hid_device *hid)
 795 {
 796         struct i2c_client *client = hid->driver_data;
 797         struct i2c_hid *ihid = i2c_get_clientdata(client);
 798         int ret = 0;
 799
 800         ret = pm_runtime_get_sync(&client->dev);
 801         if (ret < 0)
 802                 return ret;
 803
 804         set_bit(I2C_HID_STARTED, &ihid->flags);
 805         return 0;
 806 }
 807
 808 static void i2c_hid_close(struct hid_device *hid)
 809 {
 810         struct i2c_client *client = hid->driver_data;
 811         struct i2c_hid *ihid = i2c_get_clientdata(client);
 812
 813         clear_bit(I2C_HID_STARTED, &ihid->flags);
 814
 815         /* Save some power */
 816         pm_runtime_put(&client->dev);
 817 }
 818
 819 static int i2c_hid_power(struct hid_device *hid, int lvl)
 820 {
 821         struct i2c_client *client = hid->driver_data;
 822         struct i2c_hid *ihid = i2c_get_clientdata(client);
 823
 824         i2c_hid_dbg(ihid, "%s lvl:%d\n", __func__, lvl);
 825
 826         switch (lvl) {
 827         case PM_HINT_FULLON:
 828                 pm_runtime_get_sync(&client->dev);
 829                 break;
 830         case PM_HINT_NORMAL:
 831                 pm_runtime_put(&client->dev);
 832                 break;
 833         }
 834         return 0;
 835 }
 836
 837 struct hid_ll_driver i2c_hid_ll_driver = {
 838         .parse = i2c_hid_parse,
 839         .start = i2c_hid_start,
 840         .stop = i2c_hid_stop,
 841         .open = i2c_hid_open,
 842         .close = i2c_hid_close,
 843         .power = i2c_hid_power,
 844         .output_report = i2c_hid_output_report,
 845         .raw_request = i2c_hid_raw_request,
 846 };
 847 EXPORT_SYMBOL_GPL(i2c_hid_ll_driver);
 848
 849 static int i2c_hid_init_irq(struct i2c_client *client)
 850 {
 851         struct i2c_hid *ihid = i2c_get_clientdata(client);
 852         unsigned long irqflags = 0;
 853         int ret;
 854
 855         dev_dbg(&client->dev, "Requesting IRQ: %d\n", client->irq);
 856
 857         if (!irq_get_trigger_type(client->irq))
 858                 irqflags = IRQF_TRIGGER_LOW;
 859
 860         ret = request_threaded_irq(client->irq, NULL, i2c_hid_irq,
 861                                    irqflags | IRQF_ONESHOT, client->name, ihid);
 862         if (ret < 0) {
 863                 dev_warn(&client->dev,
 864                         "Could not register for %s interrupt, irq = %d,"
 865                         " ret = %d\n",
 866                         client->name, client->irq, ret);
 867
 868                 return ret;
 869         }
 870
 871         return 0;
 872 }
 873
 874 static int i2c_hid_fetch_hid_descriptor(struct i2c_hid *ihid)
 875 {
 876         struct i2c_client *client = ihid->client;
 877         struct i2c_hid_desc *hdesc = &ihid->hdesc;
 878         unsigned int dsize;
 879         int ret;
 880
 881         /* i2c hid fetch using a fixed descriptor size (30 bytes) */
 882         if (i2c_hid_get_dmi_i2c_hid_desc_override(client->name)) {
 883                 i2c_hid_dbg(ihid, "Using a HID descriptor override\n");
 884                 ihid->hdesc =
 885                         *i2c_hid_get_dmi_i2c_hid_desc_override(client->name);
 886         } else {
 887                 i2c_hid_dbg(ihid, "Fetching the HID descriptor\n");
 888                 ret = i2c_hid_command(client, &hid_descr_cmd,
 889                                       ihid->hdesc_buffer,
 890                                       sizeof(struct i2c_hid_desc));
 891                 if (ret) {
 892                         dev_err(&client->dev, "hid_descr_cmd failed\n");
 893                         return -ENODEV;
 894                 }
 895         }
 896
 897         /* Validate the length of HID descriptor, the 4 first bytes:
 898          * bytes 0-1 -> length
 899          * bytes 2-3 -> bcdVersion (has to be 1.00) */
 900         /* check bcdVersion == 1.0 */
 901         if (le16_to_cpu(hdesc->bcdVersion) != 0x0100) {
 902                 dev_err(&client->dev,
 903                         "unexpected HID descriptor bcdVersion (0x%04hx)\n",
 904                         le16_to_cpu(hdesc->bcdVersion));
 905                 return -ENODEV;
 906         }
 907
 908         /* Descriptor length should be 30 bytes as per the specification */
 909         dsize = le16_to_cpu(hdesc->wHIDDescLength);
 910         if (dsize != sizeof(struct i2c_hid_desc)) {
 911                 dev_err(&client->dev, "weird size of HID descriptor (%u)\n",
 912                         dsize);
 913                 return -ENODEV;
 914         }
 915         i2c_hid_dbg(ihid, "HID Descriptor: %*ph\n", dsize, ihid->hdesc_buffer);
 916         return 0;
 917 }
 918
 919 #ifdef CONFIG_ACPI
 920 static const struct acpi_device_id i2c_hid_acpi_blacklist[] = {
 921         /*
 922          * The CHPN0001 ACPI device, which is used to describe the Chipone
 923          * ICN8505 controller, has a _CID of PNP0C50 but is not HID compatible.
 924          */
 925         {"CHPN0001", 0 },
 926         { },
 927 };
 928
 929 static int i2c_hid_acpi_pdata(struct i2c_client *client,
 930                 struct i2c_hid_platform_data *pdata)
 931 {
 932         static guid_t i2c_hid_guid =
 933                 GUID_INIT(0x3CDFF6F7, 0x4267, 0x4555,
 934                           0xAD, 0x05, 0xB3, 0x0A, 0x3D, 0x89, 0x38, 0xDE);
 935         union acpi_object *obj;
 936         struct acpi_device *adev;
 937         acpi_handle handle;
 938
 939         handle = ACPI_HANDLE(&client->dev);
 940         if (!handle || acpi_bus_get_device(handle, &adev)) {
 941                 dev_err(&client->dev, "Error could not get ACPI device\n");
 942                 return -ENODEV;
 943         }
 944
 945         if (acpi_match_device_ids(adev, i2c_hid_acpi_blacklist) == 0)
 946                 return -ENODEV;
 947
 948         obj = acpi_evaluate_dsm_typed(handle, &i2c_hid_guid, 1, 1, NULL,
 949                                       ACPI_TYPE_INTEGER);
 950         if (!obj) {
 951                 dev_err(&client->dev, "Error _DSM call to get HID descriptor address failed\n");
 952                 return -ENODEV;
 953         }
 954
 955         pdata->hid_descriptor_address = obj->integer.value;
 956         ACPI_FREE(obj);
 957
 958         return 0;
 959 }
 960
 961 static void i2c_hid_acpi_fix_up_power(struct device *dev)
 962 {
 963         struct acpi_device *adev;
 964
 965         adev = ACPI_COMPANION(dev);
 966         if (adev)
 967                 acpi_device_fix_up_power(adev);
 968 }
 969
 970 static const struct acpi_device_id i2c_hid_acpi_match[] = {
 971         {"ACPI0C50", 0 },
 972         {"PNP0C50", 0 },
 973         { },
 974 };
 975 MODULE_DEVICE_TABLE(acpi, i2c_hid_acpi_match);
 976 #else
 977 static inline int i2c_hid_acpi_pdata(struct i2c_client *client,
 978                 struct i2c_hid_platform_data *pdata)
 979 {
 980         return -ENODEV;
 981 }
 982
 983 static inline void i2c_hid_acpi_fix_up_power(struct device *dev) {}
 984 #endif
 985
 986 #ifdef CONFIG_OF
 987 static int i2c_hid_of_probe(struct i2c_client *client,
 988                 struct i2c_hid_platform_data *pdata)
 989 {
 990         struct device *dev = &client->dev;
 991         u32 val;
 992         int ret;
 993
 994         ret = of_property_read_u32(dev->of_node, "hid-descr-addr", &val);
 995         if (ret) {
 996                 dev_err(&client->dev, "HID register address not provided\n");
 997                 return -ENODEV;
 998         }
 999         if (val >> 16) {
1000                 dev_err(&client->dev, "Bad HID register address: 0x%08x\n",
1001                         val);
1002                 return -EINVAL;
1003         }
1004         pdata->hid_descriptor_address = val;
1005
1006         return 0;
1007 }
1008
1009 static const struct of_device_id i2c_hid_of_match[] = {
1010         { .compatible = "hid-over-i2c" },
1011         {},
1012 };
1013 MODULE_DEVICE_TABLE(of, i2c_hid_of_match);
1014 #else
1015 static inline int i2c_hid_of_probe(struct i2c_client *client,
1016                 struct i2c_hid_platform_data *pdata)
1017 {
1018         return -ENODEV;
1019 }
1020 #endif
1021
1022 static void i2c_hid_fwnode_probe(struct i2c_client *client,
1023                                  struct i2c_hid_platform_data *pdata)
1024 {
1025         u32 val;
1026
1027         if (!device_property_read_u32(&client->dev, "post-power-on-delay-ms",
1028                                       &val))
1029                 pdata->post_power_delay_ms = val;
1030 }
1031
1032 static int i2c_hid_probe(struct i2c_client *client,
1033                          const struct i2c_device_id *dev_id)
1034 {
1035         int ret;
1036         struct i2c_hid *ihid;
1037         struct hid_device *hid;
1038         __u16 hidRegister;
1039         struct i2c_hid_platform_data *platform_data = client->dev.platform_data;
1040
1041         dbg_hid("HID probe called for i2c 0x%02x\n", client->addr);
1042
1043         if (!client->irq) {
1044                 dev_err(&client->dev,
1045                         "HID over i2c has not been provided an Int IRQ\n");
1046                 return -EINVAL;
1047         }
1048
1049         if (client->irq < 0) {
1050                 if (client->irq != -EPROBE_DEFER)
1051                         dev_err(&client->dev,
1052                                 "HID over i2c doesn't have a valid IRQ\n");
1053                 return client->irq;
1054         }
1055
1056         ihid = devm_kzalloc(&client->dev, sizeof(*ihid), GFP_KERNEL);
1057         if (!ihid)
1058                 return -ENOMEM;
1059
1060         if (client->dev.of_node) {
1061                 ret = i2c_hid_of_probe(client, &ihid->pdata);
1062                 if (ret)
1063                         return ret;
1064         } else if (!platform_data) {
1065                 ret = i2c_hid_acpi_pdata(client, &ihid->pdata);
1066                 if (ret)
1067                         return ret;
1068         } else {
1069                 ihid->pdata = *platform_data;
1070         }
1071
1072         /* Parse platform agnostic common properties from ACPI / device tree */
1073         i2c_hid_fwnode_probe(client, &ihid->pdata);
1074
1075         ihid->pdata.supplies[0].supply = "vdd";
1076         ihid->pdata.supplies[1].supply = "vddl";
1077
1078         ret = devm_regulator_bulk_get(&client->dev,
1079                                       ARRAY_SIZE(ihid->pdata.supplies),
1080                                       ihid->pdata.supplies);
1081         if (ret)
1082                 return ret;
1083
1084         ret = regulator_bulk_enable(ARRAY_SIZE(ihid->pdata.supplies),
1085                                     ihid->pdata.supplies);
1086         if (ret < 0)
1087                 return ret;
1088
1089         if (ihid->pdata.post_power_delay_ms)
1090                 msleep(ihid->pdata.post_power_delay_ms);
1091
1092         i2c_set_clientdata(client, ihid);
1093
1094         ihid->client = client;
1095
1096         hidRegister = ihid->pdata.hid_descriptor_address;
1097         ihid->wHIDDescRegister = cpu_to_le16(hidRegister);
1098
1099         init_waitqueue_head(&ihid->wait);
1100         mutex_init(&ihid->reset_lock);
1101
1102         /* we need to allocate the command buffer without knowing the maximum
1103          * size of the reports. Let's use HID_MIN_BUFFER_SIZE, then we do the
1104          * real computation later. */
1105         ret = i2c_hid_alloc_buffers(ihid, HID_MIN_BUFFER_SIZE);
1106         if (ret < 0)
1107                 goto err_regulator;
1108
1109         i2c_hid_acpi_fix_up_power(&client->dev);
1110
1111         pm_runtime_get_noresume(&client->dev);
1112         pm_runtime_set_active(&client->dev);
1113         pm_runtime_enable(&client->dev);
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_pm;
1122         }
1123
1124         ret = i2c_hid_fetch_hid_descriptor(ihid);
1125         if (ret < 0)
1126                 goto err_pm;
1127
1128         ret = i2c_hid_init_irq(client);
1129         if (ret < 0)
1130                 goto err_pm;
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 %04hX:%04hX",
1149                  client->name, hid->vendor, 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         if (!(ihid->quirks & I2C_HID_QUIRK_NO_RUNTIME_PM))
1162                 pm_runtime_put(&client->dev);
1163
1164         return 0;
1165
1166 err_mem_free:
1167         hid_destroy_device(hid);
1168
1169 err_irq:
1170         free_irq(client->irq, ihid);
1171
1172 err_pm:
1173         pm_runtime_put_noidle(&client->dev);
1174         pm_runtime_disable(&client->dev);
1175
1176 err_regulator:
1177         regulator_bulk_disable(ARRAY_SIZE(ihid->pdata.supplies),
1178                                ihid->pdata.supplies);
1179         i2c_hid_free_buffers(ihid);
1180         return ret;
1181 }
1182
1183 static int i2c_hid_remove(struct i2c_client *client)
1184 {
1185         struct i2c_hid *ihid = i2c_get_clientdata(client);
1186         struct hid_device *hid;
1187
1188         if (!(ihid->quirks & I2C_HID_QUIRK_NO_RUNTIME_PM))
1189                 pm_runtime_get_sync(&client->dev);
1190         pm_runtime_disable(&client->dev);
1191         pm_runtime_set_suspended(&client->dev);
1192         pm_runtime_put_noidle(&client->dev);
1193
1194         hid = ihid->hid;
1195         hid_destroy_device(hid);
1196
1197         free_irq(client->irq, ihid);
1198
1199         if (ihid->bufsize)
1200                 i2c_hid_free_buffers(ihid);
1201
1202         regulator_bulk_disable(ARRAY_SIZE(ihid->pdata.supplies),
1203                                ihid->pdata.supplies);
1204
1205         return 0;
1206 }
1207
1208 static void i2c_hid_shutdown(struct i2c_client *client)
1209 {
1210         struct i2c_hid *ihid = i2c_get_clientdata(client);
1211
1212         i2c_hid_set_power(client, I2C_HID_PWR_SLEEP);
1213         free_irq(client->irq, ihid);
1214 }
1215
1216 #ifdef CONFIG_PM_SLEEP
1217 static int i2c_hid_suspend(struct device *dev)
1218 {
1219         struct i2c_client *client = to_i2c_client(dev);
1220         struct i2c_hid *ihid = i2c_get_clientdata(client);
1221         struct hid_device *hid = ihid->hid;
1222         int ret;
1223         int wake_status;
1224
1225         if (hid->driver && hid->driver->suspend) {
1226                 /*
1227                  * Wake up the device so that IO issues in
1228                  * HID driver's suspend code can succeed.
1229                  */
1230                 ret = pm_runtime_resume(dev);
1231                 if (ret < 0)
1232                         return ret;
1233
1234                 ret = hid->driver->suspend(hid, PMSG_SUSPEND);
1235                 if (ret < 0)
1236                         return ret;
1237         }
1238
1239         if (!pm_runtime_suspended(dev)) {
1240                 /* Save some power */
1241                 i2c_hid_set_power(client, I2C_HID_PWR_SLEEP);
1242
1243                 disable_irq(client->irq);
1244         }
1245
1246         if (device_may_wakeup(&client->dev)) {
1247                 wake_status = enable_irq_wake(client->irq);
1248                 if (!wake_status)
1249                         ihid->irq_wake_enabled = true;
1250                 else
1251                         hid_warn(hid, "Failed to enable irq wake: %d\n",
1252                                 wake_status);
1253         } else {
1254                 regulator_bulk_disable(ARRAY_SIZE(ihid->pdata.supplies),
1255                                        ihid->pdata.supplies);
1256         }
1257
1258         return 0;
1259 }
1260
1261 static int i2c_hid_resume(struct device *dev)
1262 {
1263         int ret;
1264         struct i2c_client *client = to_i2c_client(dev);
1265         struct i2c_hid *ihid = i2c_get_clientdata(client);
1266         struct hid_device *hid = ihid->hid;
1267         int wake_status;
1268
1269         if (!device_may_wakeup(&client->dev)) {
1270                 ret = regulator_bulk_enable(ARRAY_SIZE(ihid->pdata.supplies),
1271                                             ihid->pdata.supplies);
1272                 if (ret)
1273                         hid_warn(hid, "Failed to enable supplies: %d\n", ret);
1274
1275                 if (ihid->pdata.post_power_delay_ms)
1276                         msleep(ihid->pdata.post_power_delay_ms);
1277         } else if (ihid->irq_wake_enabled) {
1278                 wake_status = disable_irq_wake(client->irq);
1279                 if (!wake_status)
1280                         ihid->irq_wake_enabled = false;
1281                 else
1282                         hid_warn(hid, "Failed to disable irq wake: %d\n",
1283                                 wake_status);
1284         }
1285
1286         /* We'll resume to full power */
1287         pm_runtime_disable(dev);
1288         pm_runtime_set_active(dev);
1289         pm_runtime_enable(dev);
1290
1291         enable_irq(client->irq);
1292
1293         /* Instead of resetting device, simply powers the device on. This
1294          * solves "incomplete reports" on Raydium devices 2386:3118 and
1295          * 2386:4B33 and fixes various SIS touchscreens no longer sending
1296          * data after a suspend/resume.
1297          */
1298         ret = i2c_hid_set_power(client, I2C_HID_PWR_ON);
1299         if (ret)
1300                 return ret;
1301
1302         if (hid->driver && hid->driver->reset_resume) {
1303                 ret = hid->driver->reset_resume(hid);
1304                 return ret;
1305         }
1306
1307         return 0;
1308 }
1309 #endif
1310
1311 #ifdef CONFIG_PM
1312 static int i2c_hid_runtime_suspend(struct device *dev)
1313 {
1314         struct i2c_client *client = to_i2c_client(dev);
1315
1316         i2c_hid_set_power(client, I2C_HID_PWR_SLEEP);
1317         disable_irq(client->irq);
1318         return 0;
1319 }
1320
1321 static int i2c_hid_runtime_resume(struct device *dev)
1322 {
1323         struct i2c_client *client = to_i2c_client(dev);
1324
1325         enable_irq(client->irq);
1326         i2c_hid_set_power(client, I2C_HID_PWR_ON);
1327         return 0;
1328 }
1329 #endif
1330
1331 static const struct dev_pm_ops i2c_hid_pm = {
1332         SET_SYSTEM_SLEEP_PM_OPS(i2c_hid_suspend, i2c_hid_resume)
1333         SET_RUNTIME_PM_OPS(i2c_hid_runtime_suspend, i2c_hid_runtime_resume,
1334                            NULL)
1335 };
1336
1337 static const struct i2c_device_id i2c_hid_id_table[] = {
1338         { "hid", 0 },
1339         { "hid-over-i2c", 0 },
1340         { },
1341 };
1342 MODULE_DEVICE_TABLE(i2c, i2c_hid_id_table);
1343
1344
1345 static struct i2c_driver i2c_hid_driver = {
1346         .driver = {
1347                 .name   = "i2c_hid",
1348                 .pm     = &i2c_hid_pm,
1349                 .acpi_match_table = ACPI_PTR(i2c_hid_acpi_match),
1350                 .of_match_table = of_match_ptr(i2c_hid_of_match),
1351         },
1352
1353         .probe          = i2c_hid_probe,
1354         .remove         = i2c_hid_remove,
1355         .shutdown       = i2c_hid_shutdown,
1356         .id_table       = i2c_hid_id_table,
1357 };
1358
1359 module_i2c_driver(i2c_hid_driver);
1360
1361 MODULE_DESCRIPTION("HID over I2C core driver");
1362 MODULE_AUTHOR("Benjamin Tissoires <benjamin.tissoires@gmail.com>");
1363 MODULE_LICENSE("GPL");