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
  53 /* flags */
  54 #define I2C_HID_STARTED         0
  55 #define I2C_HID_RESET_PENDING   1
  56 #define I2C_HID_READ_PENDING    2
  57
  58 #define I2C_HID_PWR_ON          0x00
  59 #define I2C_HID_PWR_SLEEP       0x01
  60
  61 /* debug option */
  62 static bool debug;
  63 module_param(debug, bool, 0444);
  64 MODULE_PARM_DESC(debug, "print a lot of debug information");
  65
  66 #define i2c_hid_dbg(ihid, fmt, arg...)                                    \
  67 do {                                                                      \
  68         if (debug)                                                        \
  69                 dev_printk(KERN_DEBUG, &(ihid)->client->dev, fmt, ##arg); \
  70 } while (0)
  71
  72 struct i2c_hid_desc {
  73         __le16 wHIDDescLength;
  74         __le16 bcdVersion;
  75         __le16 wReportDescLength;
  76         __le16 wReportDescRegister;
  77         __le16 wInputRegister;
  78         __le16 wMaxInputLength;
  79         __le16 wOutputRegister;
  80         __le16 wMaxOutputLength;
  81         __le16 wCommandRegister;
  82         __le16 wDataRegister;
  83         __le16 wVendorID;
  84         __le16 wProductID;
  85         __le16 wVersionID;
  86         __le32 reserved;
  87 } __packed;
  88
  89 struct i2c_hid_cmd {
  90         unsigned int registerIndex;
  91         __u8 opcode;
  92         unsigned int length;
  93         bool wait;
  94 };
  95
  96 union command {
  97         u8 data[0];
  98         struct cmd {
  99                 __le16 reg;
 100                 __u8 reportTypeID;
 101                 __u8 opcode;
 102         } __packed c;
 103 };
 104
 105 #define I2C_HID_CMD(opcode_) \
 106         .opcode = opcode_, .length = 4, \
 107         .registerIndex = offsetof(struct i2c_hid_desc, wCommandRegister)
 108
 109 /* fetch HID descriptor */
 110 static const struct i2c_hid_cmd hid_descr_cmd = { .length = 2 };
 111 /* fetch report descriptors */
 112 static const struct i2c_hid_cmd hid_report_descr_cmd = {
 113                 .registerIndex = offsetof(struct i2c_hid_desc,
 114                         wReportDescRegister),
 115                 .opcode = 0x00,
 116                 .length = 2 };
 117 /* commands */
 118 static const struct i2c_hid_cmd hid_reset_cmd =         { I2C_HID_CMD(0x01),
 119                                                           .wait = true };
 120 static const struct i2c_hid_cmd hid_get_report_cmd =    { I2C_HID_CMD(0x02) };
 121 static const struct i2c_hid_cmd hid_set_report_cmd =    { I2C_HID_CMD(0x03) };
 122 static const struct i2c_hid_cmd hid_set_power_cmd =     { I2C_HID_CMD(0x08) };
 123 static const struct i2c_hid_cmd hid_no_cmd =            { .length = 0 };
 124
 125 /*
 126  * These definitions are not used here, but are defined by the spec.
 127  * Keeping them here for documentation purposes.
 128  *
 129  * static const struct i2c_hid_cmd hid_get_idle_cmd = { I2C_HID_CMD(0x04) };
 130  * static const struct i2c_hid_cmd hid_set_idle_cmd = { I2C_HID_CMD(0x05) };
 131  * static const struct i2c_hid_cmd hid_get_protocol_cmd = { I2C_HID_CMD(0x06) };
 132  * static const struct i2c_hid_cmd hid_set_protocol_cmd = { I2C_HID_CMD(0x07) };
 133  */
 134
 135 /* The main device structure */
 136 struct i2c_hid {
 137         struct i2c_client       *client;        /* i2c client */
 138         struct hid_device       *hid;   /* pointer to corresponding HID dev */
 139         union {
 140                 __u8 hdesc_buffer[sizeof(struct i2c_hid_desc)];
 141                 struct i2c_hid_desc hdesc;      /* the HID Descriptor */
 142         };
 143         __le16                  wHIDDescRegister; /* location of the i2c
 144                                                    * register of the HID
 145                                                    * descriptor. */
 146         unsigned int            bufsize;        /* i2c buffer size */
 147         u8                      *inbuf;         /* Input buffer */
 148         u8                      *rawbuf;        /* Raw Input buffer */
 149         u8                      *cmdbuf;        /* Command buffer */
 150         u8                      *argsbuf;       /* Command arguments buffer */
 151
 152         unsigned long           flags;          /* device flags */
 153         unsigned long           quirks;         /* Various quirks */
 154
 155         wait_queue_head_t       wait;           /* For waiting the interrupt */
 156
 157         struct i2c_hid_platform_data pdata;
 158
 159         bool                    irq_wake_enabled;
 160         struct mutex            reset_lock;
 161 };
 162
 163 static const struct i2c_hid_quirks {
 164         __u16 idVendor;
 165         __u16 idProduct;
 166         __u32 quirks;
 167 } i2c_hid_quirks[] = {
 168         { USB_VENDOR_ID_WEIDA, USB_DEVICE_ID_WEIDA_8752,
 169                 I2C_HID_QUIRK_SET_PWR_WAKEUP_DEV },
 170         { USB_VENDOR_ID_WEIDA, USB_DEVICE_ID_WEIDA_8755,
 171                 I2C_HID_QUIRK_SET_PWR_WAKEUP_DEV },
 172         { I2C_VENDOR_ID_HANTICK, I2C_PRODUCT_ID_HANTICK_5288,
 173                 I2C_HID_QUIRK_NO_IRQ_AFTER_RESET |
 174                 I2C_HID_QUIRK_NO_RUNTIME_PM },
 175         { 0, 0 }
 176 };
 177
 178 /*
 179  * i2c_hid_lookup_quirk: return any quirks associated with a I2C HID device
 180  * @idVendor: the 16-bit vendor ID
 181  * @idProduct: the 16-bit product ID
 182  *
 183  * Returns: a u32 quirks value.
 184  */
 185 static u32 i2c_hid_lookup_quirk(const u16 idVendor, const u16 idProduct)
 186 {
 187         u32 quirks = 0;
 188         int n;
 189
 190         for (n = 0; i2c_hid_quirks[n].idVendor; n++)
 191                 if (i2c_hid_quirks[n].idVendor == idVendor &&
 192                     (i2c_hid_quirks[n].idProduct == (__u16)HID_ANY_ID ||
 193                      i2c_hid_quirks[n].idProduct == idProduct))
 194                         quirks = i2c_hid_quirks[n].quirks;
 195
 196         return quirks;
 197 }
 198
 199 static int __i2c_hid_command(struct i2c_client *client,
 200                 const struct i2c_hid_cmd *command, u8 reportID,
 201                 u8 reportType, u8 *args, int args_len,
 202                 unsigned char *buf_recv, int data_len)
 203 {
 204         struct i2c_hid *ihid = i2c_get_clientdata(client);
 205         union command *cmd = (union command *)ihid->cmdbuf;
 206         int ret;
 207         struct i2c_msg msg[2];
 208         int msg_num = 1;
 209
 210         int length = command->length;
 211         bool wait = command->wait;
 212         unsigned int registerIndex = command->registerIndex;
 213
 214         /* special case for hid_descr_cmd */
 215         if (command == &hid_descr_cmd) {
 216                 cmd->c.reg = ihid->wHIDDescRegister;
 217         } else {
 218                 cmd->data[0] = ihid->hdesc_buffer[registerIndex];
 219                 cmd->data[1] = ihid->hdesc_buffer[registerIndex + 1];
 220         }
 221
 222         if (length > 2) {
 223                 cmd->c.opcode = command->opcode;
 224                 cmd->c.reportTypeID = reportID | reportType << 4;
 225         }
 226
 227         memcpy(cmd->data + length, args, args_len);
 228         length += args_len;
 229
 230         i2c_hid_dbg(ihid, "%s: cmd=%*ph\n", __func__, length, cmd->data);
 231
 232         msg[0].addr = client->addr;
 233         msg[0].flags = client->flags & I2C_M_TEN;
 234         msg[0].len = length;
 235         msg[0].buf = cmd->data;
 236         if (data_len > 0) {
 237                 msg[1].addr = client->addr;
 238                 msg[1].flags = client->flags & I2C_M_TEN;
 239                 msg[1].flags |= I2C_M_RD;
 240                 msg[1].len = data_len;
 241                 msg[1].buf = buf_recv;
 242                 msg_num = 2;
 243                 set_bit(I2C_HID_READ_PENDING, &ihid->flags);
 244         }
 245
 246         if (wait)
 247                 set_bit(I2C_HID_RESET_PENDING, &ihid->flags);
 248
 249         ret = i2c_transfer(client->adapter, msg, msg_num);
 250
 251         if (data_len > 0)
 252                 clear_bit(I2C_HID_READ_PENDING, &ihid->flags);
 253
 254         if (ret != msg_num)
 255                 return ret < 0 ? ret : -EIO;
 256
 257         ret = 0;
 258
 259         if (wait && (ihid->quirks & I2C_HID_QUIRK_NO_IRQ_AFTER_RESET)) {
 260                 msleep(100);
 261         } else if (wait) {
 262                 i2c_hid_dbg(ihid, "%s: waiting...\n", __func__);
 263                 if (!wait_event_timeout(ihid->wait,
 264                                 !test_bit(I2C_HID_RESET_PENDING, &ihid->flags),
 265                                 msecs_to_jiffies(5000)))
 266                         ret = -ENODATA;
 267                 i2c_hid_dbg(ihid, "%s: finished.\n", __func__);
 268         }
 269
 270         return ret;
 271 }
 272
 273 static int i2c_hid_command(struct i2c_client *client,
 274                 const struct i2c_hid_cmd *command,
 275                 unsigned char *buf_recv, int data_len)
 276 {
 277         return __i2c_hid_command(client, command, 0, 0, NULL, 0,
 278                                 buf_recv, data_len);
 279 }
 280
 281 static int i2c_hid_get_report(struct i2c_client *client, u8 reportType,
 282                 u8 reportID, unsigned char *buf_recv, int data_len)
 283 {
 284         struct i2c_hid *ihid = i2c_get_clientdata(client);
 285         u8 args[3];
 286         int ret;
 287         int args_len = 0;
 288         u16 readRegister = le16_to_cpu(ihid->hdesc.wDataRegister);
 289
 290         i2c_hid_dbg(ihid, "%s\n", __func__);
 291
 292         if (reportID >= 0x0F) {
 293                 args[args_len++] = reportID;
 294                 reportID = 0x0F;
 295         }
 296
 297         args[args_len++] = readRegister & 0xFF;
 298         args[args_len++] = readRegister >> 8;
 299
 300         ret = __i2c_hid_command(client, &hid_get_report_cmd, reportID,
 301                 reportType, args, args_len, buf_recv, data_len);
 302         if (ret) {
 303                 dev_err(&client->dev,
 304                         "failed to retrieve report from device.\n");
 305                 return ret;
 306         }
 307
 308         return 0;
 309 }
 310
 311 /**
 312  * i2c_hid_set_or_send_report: forward an incoming report to the device
 313  * @client: the i2c_client of the device
 314  * @reportType: 0x03 for HID_FEATURE_REPORT ; 0x02 for HID_OUTPUT_REPORT
 315  * @reportID: the report ID
 316  * @buf: the actual data to transfer, without the report ID
 317  * @len: size of buf
 318  * @use_data: true: use SET_REPORT HID command, false: send plain OUTPUT report
 319  */
 320 static int i2c_hid_set_or_send_report(struct i2c_client *client, u8 reportType,
 321                 u8 reportID, unsigned char *buf, size_t data_len, bool use_data)
 322 {
 323         struct i2c_hid *ihid = i2c_get_clientdata(client);
 324         u8 *args = ihid->argsbuf;
 325         const struct i2c_hid_cmd *hidcmd;
 326         int ret;
 327         u16 dataRegister = le16_to_cpu(ihid->hdesc.wDataRegister);
 328         u16 outputRegister = le16_to_cpu(ihid->hdesc.wOutputRegister);
 329         u16 maxOutputLength = le16_to_cpu(ihid->hdesc.wMaxOutputLength);
 330         u16 size;
 331         int args_len;
 332         int index = 0;
 333
 334         i2c_hid_dbg(ihid, "%s\n", __func__);
 335
 336         if (data_len > ihid->bufsize)
 337                 return -EINVAL;
 338
 339         size =          2                       /* size */ +
 340                         (reportID ? 1 : 0)      /* reportID */ +
 341                         data_len                /* buf */;
 342         args_len =      (reportID >= 0x0F ? 1 : 0) /* optional third byte */ +
 343                         2                       /* dataRegister */ +
 344                         size                    /* args */;
 345
 346         if (!use_data && maxOutputLength == 0)
 347                 return -ENOSYS;
 348
 349         if (reportID >= 0x0F) {
 350                 args[index++] = reportID;
 351                 reportID = 0x0F;
 352         }
 353
 354         /*
 355          * use the data register for feature reports or if the device does not
 356          * support the output register
 357          */
 358         if (use_data) {
 359                 args[index++] = dataRegister & 0xFF;
 360                 args[index++] = dataRegister >> 8;
 361                 hidcmd = &hid_set_report_cmd;
 362         } else {
 363                 args[index++] = outputRegister & 0xFF;
 364                 args[index++] = outputRegister >> 8;
 365                 hidcmd = &hid_no_cmd;
 366         }
 367
 368         args[index++] = size & 0xFF;
 369         args[index++] = size >> 8;
 370
 371         if (reportID)
 372                 args[index++] = reportID;
 373
 374         memcpy(&args[index], buf, data_len);
 375
 376         ret = __i2c_hid_command(client, hidcmd, reportID,
 377                 reportType, args, args_len, NULL, 0);
 378         if (ret) {
 379                 dev_err(&client->dev, "failed to set a report to device.\n");
 380                 return ret;
 381         }
 382
 383         return data_len;
 384 }
 385
 386 static int i2c_hid_set_power(struct i2c_client *client, int power_state)
 387 {
 388         struct i2c_hid *ihid = i2c_get_clientdata(client);
 389         int ret;
 390
 391         i2c_hid_dbg(ihid, "%s\n", __func__);
 392
 393         /*
 394          * Some devices require to send a command to wakeup before power on.
 395          * The call will get a return value (EREMOTEIO) but device will be
 396          * triggered and activated. After that, it goes like a normal device.
 397          */
 398         if (power_state == I2C_HID_PWR_ON &&
 399             ihid->quirks & I2C_HID_QUIRK_SET_PWR_WAKEUP_DEV) {
 400                 ret = i2c_hid_command(client, &hid_set_power_cmd, NULL, 0);
 401
 402                 /* Device was already activated */
 403                 if (!ret)
 404                         goto set_pwr_exit;
 405         }
 406
 407         ret = __i2c_hid_command(client, &hid_set_power_cmd, power_state,
 408                 0, NULL, 0, NULL, 0);
 409
 410         if (ret)
 411                 dev_err(&client->dev, "failed to change power setting.\n");
 412
 413 set_pwr_exit:
 414         return ret;
 415 }
 416
 417 static int i2c_hid_hwreset(struct i2c_client *client)
 418 {
 419         struct i2c_hid *ihid = i2c_get_clientdata(client);
 420         int ret;
 421
 422         i2c_hid_dbg(ihid, "%s\n", __func__);
 423
 424         /*
 425          * This prevents sending feature reports while the device is
 426          * being reset. Otherwise we may lose the reset complete
 427          * interrupt.
 428          */
 429         mutex_lock(&ihid->reset_lock);
 430
 431         ret = i2c_hid_set_power(client, I2C_HID_PWR_ON);
 432         if (ret)
 433                 goto out_unlock;
 434
 435         /*
 436          * The HID over I2C specification states that if a DEVICE needs time
 437          * after the PWR_ON request, it should utilise CLOCK stretching.
 438          * However, it has been observered that the Windows driver provides a
 439          * 1ms sleep between the PWR_ON and RESET requests and that some devices
 440          * rely on this.
 441          */
 442         usleep_range(1000, 5000);
 443
 444         i2c_hid_dbg(ihid, "resetting...\n");
 445
 446         ret = i2c_hid_command(client, &hid_reset_cmd, NULL, 0);
 447         if (ret) {
 448                 dev_err(&client->dev, "failed to reset device.\n");
 449                 i2c_hid_set_power(client, I2C_HID_PWR_SLEEP);
 450         }
 451
 452 out_unlock:
 453         mutex_unlock(&ihid->reset_lock);
 454         return ret;
 455 }
 456
 457 static void i2c_hid_get_input(struct i2c_hid *ihid)
 458 {
 459         int ret;
 460         u32 ret_size;
 461         int size = le16_to_cpu(ihid->hdesc.wMaxInputLength);
 462
 463         if (size > ihid->bufsize)
 464                 size = ihid->bufsize;
 465
 466         ret = i2c_master_recv(ihid->client, ihid->inbuf, size);
 467         if (ret != size) {
 468                 if (ret < 0)
 469                         return;
 470
 471                 dev_err(&ihid->client->dev, "%s: got %d data instead of %d\n",
 472                         __func__, ret, size);
 473                 return;
 474         }
 475
 476         ret_size = ihid->inbuf[0] | ihid->inbuf[1] << 8;
 477
 478         if (!ret_size) {
 479                 /* host or device initiated RESET completed */
 480                 if (test_and_clear_bit(I2C_HID_RESET_PENDING, &ihid->flags))
 481                         wake_up(&ihid->wait);
 482                 return;
 483         }
 484
 485         if ((ret_size > size) || (ret_size < 2)) {
 486                 dev_err(&ihid->client->dev, "%s: incomplete report (%d/%d)\n",
 487                         __func__, size, ret_size);
 488                 return;
 489         }
 490
 491         i2c_hid_dbg(ihid, "input: %*ph\n", ret_size, ihid->inbuf);
 492
 493         if (test_bit(I2C_HID_STARTED, &ihid->flags))
 494                 hid_input_report(ihid->hid, HID_INPUT_REPORT, ihid->inbuf + 2,
 495                                 ret_size - 2, 1);
 496
 497         return;
 498 }
 499
 500 static irqreturn_t i2c_hid_irq(int irq, void *dev_id)
 501 {
 502         struct i2c_hid *ihid = dev_id;
 503
 504         if (test_bit(I2C_HID_READ_PENDING, &ihid->flags))
 505                 return IRQ_HANDLED;
 506
 507         i2c_hid_get_input(ihid);
 508
 509         return IRQ_HANDLED;
 510 }
 511
 512 static int i2c_hid_get_report_length(struct hid_report *report)
 513 {
 514         return ((report->size - 1) >> 3) + 1 +
 515                 report->device->report_enum[report->type].numbered + 2;
 516 }
 517
 518 /*
 519  * Traverse the supplied list of reports and find the longest
 520  */
 521 static void i2c_hid_find_max_report(struct hid_device *hid, unsigned int type,
 522                 unsigned int *max)
 523 {
 524         struct hid_report *report;
 525         unsigned int size;
 526
 527         /* We should not rely on wMaxInputLength, as some devices may set it to
 528          * a wrong length. */
 529         list_for_each_entry(report, &hid->report_enum[type].report_list, list) {
 530                 size = i2c_hid_get_report_length(report);
 531                 if (*max < size)
 532                         *max = size;
 533         }
 534 }
 535
 536 static void i2c_hid_free_buffers(struct i2c_hid *ihid)
 537 {
 538         kfree(ihid->inbuf);
 539         kfree(ihid->rawbuf);
 540         kfree(ihid->argsbuf);
 541         kfree(ihid->cmdbuf);
 542         ihid->inbuf = NULL;
 543         ihid->rawbuf = NULL;
 544         ihid->cmdbuf = NULL;
 545         ihid->argsbuf = NULL;
 546         ihid->bufsize = 0;
 547 }
 548
 549 static int i2c_hid_alloc_buffers(struct i2c_hid *ihid, size_t report_size)
 550 {
 551         /* the worst case is computed from the set_report command with a
 552          * reportID > 15 and the maximum report length */
 553         int args_len = sizeof(__u8) + /* ReportID */
 554                        sizeof(__u8) + /* optional ReportID byte */
 555                        sizeof(__u16) + /* data register */
 556                        sizeof(__u16) + /* size of the report */
 557                        report_size; /* report */
 558
 559         ihid->inbuf = kzalloc(report_size, GFP_KERNEL);
 560         ihid->rawbuf = kzalloc(report_size, GFP_KERNEL);
 561         ihid->argsbuf = kzalloc(args_len, GFP_KERNEL);
 562         ihid->cmdbuf = kzalloc(sizeof(union command) + args_len, GFP_KERNEL);
 563
 564         if (!ihid->inbuf || !ihid->rawbuf || !ihid->argsbuf || !ihid->cmdbuf) {
 565                 i2c_hid_free_buffers(ihid);
 566                 return -ENOMEM;
 567         }
 568
 569         ihid->bufsize = report_size;
 570
 571         return 0;
 572 }
 573
 574 static int i2c_hid_get_raw_report(struct hid_device *hid,
 575                 unsigned char report_number, __u8 *buf, size_t count,
 576                 unsigned char report_type)
 577 {
 578         struct i2c_client *client = hid->driver_data;
 579         struct i2c_hid *ihid = i2c_get_clientdata(client);
 580         size_t ret_count, ask_count;
 581         int ret;
 582
 583         if (report_type == HID_OUTPUT_REPORT)
 584                 return -EINVAL;
 585
 586         /* +2 bytes to include the size of the reply in the query buffer */
 587         ask_count = min(count + 2, (size_t)ihid->bufsize);
 588
 589         ret = i2c_hid_get_report(client,
 590                         report_type == HID_FEATURE_REPORT ? 0x03 : 0x01,
 591                         report_number, ihid->rawbuf, ask_count);
 592
 593         if (ret < 0)
 594                 return ret;
 595
 596         ret_count = ihid->rawbuf[0] | (ihid->rawbuf[1] << 8);
 597
 598         if (ret_count <= 2)
 599                 return 0;
 600
 601         ret_count = min(ret_count, ask_count);
 602
 603         /* The query buffer contains the size, dropping it in the reply */
 604         count = min(count, ret_count - 2);
 605         memcpy(buf, ihid->rawbuf + 2, count);
 606
 607         return count;
 608 }
 609
 610 static int i2c_hid_output_raw_report(struct hid_device *hid, __u8 *buf,
 611                 size_t count, unsigned char report_type, bool use_data)
 612 {
 613         struct i2c_client *client = hid->driver_data;
 614         struct i2c_hid *ihid = i2c_get_clientdata(client);
 615         int report_id = buf[0];
 616         int ret;
 617
 618         if (report_type == HID_INPUT_REPORT)
 619                 return -EINVAL;
 620
 621         mutex_lock(&ihid->reset_lock);
 622
 623         if (report_id) {
 624                 buf++;
 625                 count--;
 626         }
 627
 628         ret = i2c_hid_set_or_send_report(client,
 629                                 report_type == HID_FEATURE_REPORT ? 0x03 : 0x02,
 630                                 report_id, buf, count, use_data);
 631
 632         if (report_id && ret >= 0)
 633                 ret++; /* add report_id to the number of transfered bytes */
 634
 635         mutex_unlock(&ihid->reset_lock);
 636
 637         return ret;
 638 }
 639
 640 static int i2c_hid_output_report(struct hid_device *hid, __u8 *buf,
 641                 size_t count)
 642 {
 643         return i2c_hid_output_raw_report(hid, buf, count, HID_OUTPUT_REPORT,
 644                         false);
 645 }
 646
 647 static int i2c_hid_raw_request(struct hid_device *hid, unsigned char reportnum,
 648                                __u8 *buf, size_t len, unsigned char rtype,
 649                                int reqtype)
 650 {
 651         switch (reqtype) {
 652         case HID_REQ_GET_REPORT:
 653                 return i2c_hid_get_raw_report(hid, reportnum, buf, len, rtype);
 654         case HID_REQ_SET_REPORT:
 655                 if (buf[0] != reportnum)
 656                         return -EINVAL;
 657                 return i2c_hid_output_raw_report(hid, buf, len, rtype, true);
 658         default:
 659                 return -EIO;
 660         }
 661 }
 662
 663 static int i2c_hid_parse(struct hid_device *hid)
 664 {
 665         struct i2c_client *client = hid->driver_data;
 666         struct i2c_hid *ihid = i2c_get_clientdata(client);
 667         struct i2c_hid_desc *hdesc = &ihid->hdesc;
 668         unsigned int rsize;
 669         char *rdesc;
 670         int ret;
 671         int tries = 3;
 672         char *use_override;
 673
 674         i2c_hid_dbg(ihid, "entering %s\n", __func__);
 675
 676         rsize = le16_to_cpu(hdesc->wReportDescLength);
 677         if (!rsize || rsize > HID_MAX_DESCRIPTOR_SIZE) {
 678                 dbg_hid("weird size of report descriptor (%u)\n", rsize);
 679                 return -EINVAL;
 680         }
 681
 682         do {
 683                 ret = i2c_hid_hwreset(client);
 684                 if (ret)
 685                         msleep(1000);
 686         } while (tries-- > 0 && ret);
 687
 688         if (ret)
 689                 return ret;
 690
 691         use_override = i2c_hid_get_dmi_hid_report_desc_override(client->name,
 692                                                                 &rsize);
 693
 694         if (use_override) {
 695                 rdesc = use_override;
 696                 i2c_hid_dbg(ihid, "Using a HID report descriptor override\n");
 697         } else {
 698                 rdesc = kzalloc(rsize, GFP_KERNEL);
 699
 700                 if (!rdesc) {
 701                         dbg_hid("couldn't allocate rdesc memory\n");
 702                         return -ENOMEM;
 703                 }
 704
 705                 i2c_hid_dbg(ihid, "asking HID report descriptor\n");
 706
 707                 ret = i2c_hid_command(client, &hid_report_descr_cmd,
 708                                       rdesc, rsize);
 709                 if (ret) {
 710                         hid_err(hid, "reading report descriptor failed\n");
 711                         kfree(rdesc);
 712                         return -EIO;
 713                 }
 714         }
 715
 716         i2c_hid_dbg(ihid, "Report Descriptor: %*ph\n", rsize, rdesc);
 717
 718         ret = hid_parse_report(hid, rdesc, rsize);
 719         if (!use_override)
 720                 kfree(rdesc);
 721
 722         if (ret) {
 723                 dbg_hid("parsing report descriptor failed\n");
 724                 return ret;
 725         }
 726
 727         return 0;
 728 }
 729
 730 static int i2c_hid_start(struct hid_device *hid)
 731 {
 732         struct i2c_client *client = hid->driver_data;
 733         struct i2c_hid *ihid = i2c_get_clientdata(client);
 734         int ret;
 735         unsigned int bufsize = HID_MIN_BUFFER_SIZE;
 736
 737         i2c_hid_find_max_report(hid, HID_INPUT_REPORT, &bufsize);
 738         i2c_hid_find_max_report(hid, HID_OUTPUT_REPORT, &bufsize);
 739         i2c_hid_find_max_report(hid, HID_FEATURE_REPORT, &bufsize);
 740
 741         if (bufsize > ihid->bufsize) {
 742                 disable_irq(client->irq);
 743                 i2c_hid_free_buffers(ihid);
 744
 745                 ret = i2c_hid_alloc_buffers(ihid, bufsize);
 746                 enable_irq(client->irq);
 747
 748                 if (ret)
 749                         return ret;
 750         }
 751
 752         return 0;
 753 }
 754
 755 static void i2c_hid_stop(struct hid_device *hid)
 756 {
 757         hid->claimed = 0;
 758 }
 759
 760 static int i2c_hid_open(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 = 0;
 765
 766         ret = pm_runtime_get_sync(&client->dev);
 767         if (ret < 0)
 768                 return ret;
 769
 770         set_bit(I2C_HID_STARTED, &ihid->flags);
 771         return 0;
 772 }
 773
 774 static void i2c_hid_close(struct hid_device *hid)
 775 {
 776         struct i2c_client *client = hid->driver_data;
 777         struct i2c_hid *ihid = i2c_get_clientdata(client);
 778
 779         clear_bit(I2C_HID_STARTED, &ihid->flags);
 780
 781         /* Save some power */
 782         pm_runtime_put(&client->dev);
 783 }
 784
 785 static int i2c_hid_power(struct hid_device *hid, int lvl)
 786 {
 787         struct i2c_client *client = hid->driver_data;
 788         struct i2c_hid *ihid = i2c_get_clientdata(client);
 789
 790         i2c_hid_dbg(ihid, "%s lvl:%d\n", __func__, lvl);
 791
 792         switch (lvl) {
 793         case PM_HINT_FULLON:
 794                 pm_runtime_get_sync(&client->dev);
 795                 break;
 796         case PM_HINT_NORMAL:
 797                 pm_runtime_put(&client->dev);
 798                 break;
 799         }
 800         return 0;
 801 }
 802
 803 struct hid_ll_driver i2c_hid_ll_driver = {
 804         .parse = i2c_hid_parse,
 805         .start = i2c_hid_start,
 806         .stop = i2c_hid_stop,
 807         .open = i2c_hid_open,
 808         .close = i2c_hid_close,
 809         .power = i2c_hid_power,
 810         .output_report = i2c_hid_output_report,
 811         .raw_request = i2c_hid_raw_request,
 812 };
 813 EXPORT_SYMBOL_GPL(i2c_hid_ll_driver);
 814
 815 static int i2c_hid_init_irq(struct i2c_client *client)
 816 {
 817         struct i2c_hid *ihid = i2c_get_clientdata(client);
 818         unsigned long irqflags = 0;
 819         int ret;
 820
 821         dev_dbg(&client->dev, "Requesting IRQ: %d\n", client->irq);
 822
 823         if (!irq_get_trigger_type(client->irq))
 824                 irqflags = IRQF_TRIGGER_LOW;
 825
 826         ret = request_threaded_irq(client->irq, NULL, i2c_hid_irq,
 827                                    irqflags | IRQF_ONESHOT, client->name, ihid);
 828         if (ret < 0) {
 829                 dev_warn(&client->dev,
 830                         "Could not register for %s interrupt, irq = %d,"
 831                         " ret = %d\n",
 832                         client->name, client->irq, ret);
 833
 834                 return ret;
 835         }
 836
 837         return 0;
 838 }
 839
 840 static int i2c_hid_fetch_hid_descriptor(struct i2c_hid *ihid)
 841 {
 842         struct i2c_client *client = ihid->client;
 843         struct i2c_hid_desc *hdesc = &ihid->hdesc;
 844         unsigned int dsize;
 845         int ret;
 846
 847         /* i2c hid fetch using a fixed descriptor size (30 bytes) */
 848         if (i2c_hid_get_dmi_i2c_hid_desc_override(client->name)) {
 849                 i2c_hid_dbg(ihid, "Using a HID descriptor override\n");
 850                 ihid->hdesc =
 851                         *i2c_hid_get_dmi_i2c_hid_desc_override(client->name);
 852         } else {
 853                 i2c_hid_dbg(ihid, "Fetching the HID descriptor\n");
 854                 ret = i2c_hid_command(client, &hid_descr_cmd,
 855                                       ihid->hdesc_buffer,
 856                                       sizeof(struct i2c_hid_desc));
 857                 if (ret) {
 858                         dev_err(&client->dev, "hid_descr_cmd failed\n");
 859                         return -ENODEV;
 860                 }
 861         }
 862
 863         /* Validate the length of HID descriptor, the 4 first bytes:
 864          * bytes 0-1 -> length
 865          * bytes 2-3 -> bcdVersion (has to be 1.00) */
 866         /* check bcdVersion == 1.0 */
 867         if (le16_to_cpu(hdesc->bcdVersion) != 0x0100) {
 868                 dev_err(&client->dev,
 869                         "unexpected HID descriptor bcdVersion (0x%04hx)\n",
 870                         le16_to_cpu(hdesc->bcdVersion));
 871                 return -ENODEV;
 872         }
 873
 874         /* Descriptor length should be 30 bytes as per the specification */
 875         dsize = le16_to_cpu(hdesc->wHIDDescLength);
 876         if (dsize != sizeof(struct i2c_hid_desc)) {
 877                 dev_err(&client->dev, "weird size of HID descriptor (%u)\n",
 878                         dsize);
 879                 return -ENODEV;
 880         }
 881         i2c_hid_dbg(ihid, "HID Descriptor: %*ph\n", dsize, ihid->hdesc_buffer);
 882         return 0;
 883 }
 884
 885 #ifdef CONFIG_ACPI
 886 static const struct acpi_device_id i2c_hid_acpi_blacklist[] = {
 887         /*
 888          * The CHPN0001 ACPI device, which is used to describe the Chipone
 889          * ICN8505 controller, has a _CID of PNP0C50 but is not HID compatible.
 890          */
 891         {"CHPN0001", 0 },
 892         { },
 893 };
 894
 895 static int i2c_hid_acpi_pdata(struct i2c_client *client,
 896                 struct i2c_hid_platform_data *pdata)
 897 {
 898         static guid_t i2c_hid_guid =
 899                 GUID_INIT(0x3CDFF6F7, 0x4267, 0x4555,
 900                           0xAD, 0x05, 0xB3, 0x0A, 0x3D, 0x89, 0x38, 0xDE);
 901         union acpi_object *obj;
 902         struct acpi_device *adev;
 903         acpi_handle handle;
 904
 905         handle = ACPI_HANDLE(&client->dev);
 906         if (!handle || acpi_bus_get_device(handle, &adev)) {
 907                 dev_err(&client->dev, "Error could not get ACPI device\n");
 908                 return -ENODEV;
 909         }
 910
 911         if (acpi_match_device_ids(adev, i2c_hid_acpi_blacklist) == 0)
 912                 return -ENODEV;
 913
 914         obj = acpi_evaluate_dsm_typed(handle, &i2c_hid_guid, 1, 1, NULL,
 915                                       ACPI_TYPE_INTEGER);
 916         if (!obj) {
 917                 dev_err(&client->dev, "Error _DSM call to get HID descriptor address failed\n");
 918                 return -ENODEV;
 919         }
 920
 921         pdata->hid_descriptor_address = obj->integer.value;
 922         ACPI_FREE(obj);
 923
 924         return 0;
 925 }
 926
 927 static void i2c_hid_acpi_fix_up_power(struct device *dev)
 928 {
 929         struct acpi_device *adev;
 930
 931         adev = ACPI_COMPANION(dev);
 932         if (adev)
 933                 acpi_device_fix_up_power(adev);
 934 }
 935
 936 static const struct acpi_device_id i2c_hid_acpi_match[] = {
 937         {"ACPI0C50", 0 },
 938         {"PNP0C50", 0 },
 939         { },
 940 };
 941 MODULE_DEVICE_TABLE(acpi, i2c_hid_acpi_match);
 942 #else
 943 static inline int i2c_hid_acpi_pdata(struct i2c_client *client,
 944                 struct i2c_hid_platform_data *pdata)
 945 {
 946         return -ENODEV;
 947 }
 948
 949 static inline void i2c_hid_acpi_fix_up_power(struct device *dev) {}
 950 #endif
 951
 952 #ifdef CONFIG_OF
 953 static int i2c_hid_of_probe(struct i2c_client *client,
 954                 struct i2c_hid_platform_data *pdata)
 955 {
 956         struct device *dev = &client->dev;
 957         u32 val;
 958         int ret;
 959
 960         ret = of_property_read_u32(dev->of_node, "hid-descr-addr", &val);
 961         if (ret) {
 962                 dev_err(&client->dev, "HID register address not provided\n");
 963                 return -ENODEV;
 964         }
 965         if (val >> 16) {
 966                 dev_err(&client->dev, "Bad HID register address: 0x%08x\n",
 967                         val);
 968                 return -EINVAL;
 969         }
 970         pdata->hid_descriptor_address = val;
 971
 972         return 0;
 973 }
 974
 975 static const struct of_device_id i2c_hid_of_match[] = {
 976         { .compatible = "hid-over-i2c" },
 977         {},
 978 };
 979 MODULE_DEVICE_TABLE(of, i2c_hid_of_match);
 980 #else
 981 static inline int i2c_hid_of_probe(struct i2c_client *client,
 982                 struct i2c_hid_platform_data *pdata)
 983 {
 984         return -ENODEV;
 985 }
 986 #endif
 987
 988 static void i2c_hid_fwnode_probe(struct i2c_client *client,
 989                                  struct i2c_hid_platform_data *pdata)
 990 {
 991         u32 val;
 992
 993         if (!device_property_read_u32(&client->dev, "post-power-on-delay-ms",
 994                                       &val))
 995                 pdata->post_power_delay_ms = val;
 996 }
 997
 998 static int i2c_hid_probe(struct i2c_client *client,
 999                          const struct i2c_device_id *dev_id)
1000 {
1001         int ret;
1002         struct i2c_hid *ihid;
1003         struct hid_device *hid;
1004         __u16 hidRegister;
1005         struct i2c_hid_platform_data *platform_data = client->dev.platform_data;
1006
1007         dbg_hid("HID probe called for i2c 0x%02x\n", client->addr);
1008
1009         if (!client->irq) {
1010                 dev_err(&client->dev,
1011                         "HID over i2c has not been provided an Int IRQ\n");
1012                 return -EINVAL;
1013         }
1014
1015         if (client->irq < 0) {
1016                 if (client->irq != -EPROBE_DEFER)
1017                         dev_err(&client->dev,
1018                                 "HID over i2c doesn't have a valid IRQ\n");
1019                 return client->irq;
1020         }
1021
1022         ihid = devm_kzalloc(&client->dev, sizeof(*ihid), GFP_KERNEL);
1023         if (!ihid)
1024                 return -ENOMEM;
1025
1026         if (client->dev.of_node) {
1027                 ret = i2c_hid_of_probe(client, &ihid->pdata);
1028                 if (ret)
1029                         return ret;
1030         } else if (!platform_data) {
1031                 ret = i2c_hid_acpi_pdata(client, &ihid->pdata);
1032                 if (ret)
1033                         return ret;
1034         } else {
1035                 ihid->pdata = *platform_data;
1036         }
1037
1038         /* Parse platform agnostic common properties from ACPI / device tree */
1039         i2c_hid_fwnode_probe(client, &ihid->pdata);
1040
1041         ihid->pdata.supplies[0].supply = "vdd";
1042         ihid->pdata.supplies[1].supply = "vddl";
1043
1044         ret = devm_regulator_bulk_get(&client->dev,
1045                                       ARRAY_SIZE(ihid->pdata.supplies),
1046                                       ihid->pdata.supplies);
1047         if (ret)
1048                 return ret;
1049
1050         ret = regulator_bulk_enable(ARRAY_SIZE(ihid->pdata.supplies),
1051                                     ihid->pdata.supplies);
1052         if (ret < 0)
1053                 return ret;
1054
1055         if (ihid->pdata.post_power_delay_ms)
1056                 msleep(ihid->pdata.post_power_delay_ms);
1057
1058         i2c_set_clientdata(client, ihid);
1059
1060         ihid->client = client;
1061
1062         hidRegister = ihid->pdata.hid_descriptor_address;
1063         ihid->wHIDDescRegister = cpu_to_le16(hidRegister);
1064
1065         init_waitqueue_head(&ihid->wait);
1066         mutex_init(&ihid->reset_lock);
1067
1068         /* we need to allocate the command buffer without knowing the maximum
1069          * size of the reports. Let's use HID_MIN_BUFFER_SIZE, then we do the
1070          * real computation later. */
1071         ret = i2c_hid_alloc_buffers(ihid, HID_MIN_BUFFER_SIZE);
1072         if (ret < 0)
1073                 goto err_regulator;
1074
1075         i2c_hid_acpi_fix_up_power(&client->dev);
1076
1077         pm_runtime_get_noresume(&client->dev);
1078         pm_runtime_set_active(&client->dev);
1079         pm_runtime_enable(&client->dev);
1080         device_enable_async_suspend(&client->dev);
1081
1082         /* Make sure there is something at this address */
1083         ret = i2c_smbus_read_byte(client);
1084         if (ret < 0) {
1085                 dev_dbg(&client->dev, "nothing at this address: %d\n", ret);
1086                 ret = -ENXIO;
1087                 goto err_pm;
1088         }
1089
1090         ret = i2c_hid_fetch_hid_descriptor(ihid);
1091         if (ret < 0)
1092                 goto err_pm;
1093
1094         ret = i2c_hid_init_irq(client);
1095         if (ret < 0)
1096                 goto err_pm;
1097
1098         hid = hid_allocate_device();
1099         if (IS_ERR(hid)) {
1100                 ret = PTR_ERR(hid);
1101                 goto err_irq;
1102         }
1103
1104         ihid->hid = hid;
1105
1106         hid->driver_data = client;
1107         hid->ll_driver = &i2c_hid_ll_driver;
1108         hid->dev.parent = &client->dev;
1109         hid->bus = BUS_I2C;
1110         hid->version = le16_to_cpu(ihid->hdesc.bcdVersion);
1111         hid->vendor = le16_to_cpu(ihid->hdesc.wVendorID);
1112         hid->product = le16_to_cpu(ihid->hdesc.wProductID);
1113
1114         snprintf(hid->name, sizeof(hid->name), "%s %04hX:%04hX",
1115                  client->name, hid->vendor, hid->product);
1116         strlcpy(hid->phys, dev_name(&client->dev), sizeof(hid->phys));
1117
1118         ihid->quirks = i2c_hid_lookup_quirk(hid->vendor, hid->product);
1119
1120         ret = hid_add_device(hid);
1121         if (ret) {
1122                 if (ret != -ENODEV)
1123                         hid_err(client, "can't add hid device: %d\n", ret);
1124                 goto err_mem_free;
1125         }
1126
1127         if (!(ihid->quirks & I2C_HID_QUIRK_NO_RUNTIME_PM))
1128                 pm_runtime_put(&client->dev);
1129
1130         return 0;
1131
1132 err_mem_free:
1133         hid_destroy_device(hid);
1134
1135 err_irq:
1136         free_irq(client->irq, ihid);
1137
1138 err_pm:
1139         pm_runtime_put_noidle(&client->dev);
1140         pm_runtime_disable(&client->dev);
1141
1142 err_regulator:
1143         regulator_bulk_disable(ARRAY_SIZE(ihid->pdata.supplies),
1144                                ihid->pdata.supplies);
1145         i2c_hid_free_buffers(ihid);
1146         return ret;
1147 }
1148
1149 static int i2c_hid_remove(struct i2c_client *client)
1150 {
1151         struct i2c_hid *ihid = i2c_get_clientdata(client);
1152         struct hid_device *hid;
1153
1154         if (!(ihid->quirks & I2C_HID_QUIRK_NO_RUNTIME_PM))
1155                 pm_runtime_get_sync(&client->dev);
1156         pm_runtime_disable(&client->dev);
1157         pm_runtime_set_suspended(&client->dev);
1158         pm_runtime_put_noidle(&client->dev);
1159
1160         hid = ihid->hid;
1161         hid_destroy_device(hid);
1162
1163         free_irq(client->irq, ihid);
1164
1165         if (ihid->bufsize)
1166                 i2c_hid_free_buffers(ihid);
1167
1168         regulator_bulk_disable(ARRAY_SIZE(ihid->pdata.supplies),
1169                                ihid->pdata.supplies);
1170
1171         return 0;
1172 }
1173
1174 static void i2c_hid_shutdown(struct i2c_client *client)
1175 {
1176         struct i2c_hid *ihid = i2c_get_clientdata(client);
1177
1178         i2c_hid_set_power(client, I2C_HID_PWR_SLEEP);
1179         free_irq(client->irq, ihid);
1180 }
1181
1182 #ifdef CONFIG_PM_SLEEP
1183 static int i2c_hid_suspend(struct device *dev)
1184 {
1185         struct i2c_client *client = to_i2c_client(dev);
1186         struct i2c_hid *ihid = i2c_get_clientdata(client);
1187         struct hid_device *hid = ihid->hid;
1188         int ret;
1189         int wake_status;
1190
1191         if (hid->driver && hid->driver->suspend) {
1192                 /*
1193                  * Wake up the device so that IO issues in
1194                  * HID driver's suspend code can succeed.
1195                  */
1196                 ret = pm_runtime_resume(dev);
1197                 if (ret < 0)
1198                         return ret;
1199
1200                 ret = hid->driver->suspend(hid, PMSG_SUSPEND);
1201                 if (ret < 0)
1202                         return ret;
1203         }
1204
1205         if (!pm_runtime_suspended(dev)) {
1206                 /* Save some power */
1207                 i2c_hid_set_power(client, I2C_HID_PWR_SLEEP);
1208
1209                 disable_irq(client->irq);
1210         }
1211
1212         if (device_may_wakeup(&client->dev)) {
1213                 wake_status = enable_irq_wake(client->irq);
1214                 if (!wake_status)
1215                         ihid->irq_wake_enabled = true;
1216                 else
1217                         hid_warn(hid, "Failed to enable irq wake: %d\n",
1218                                 wake_status);
1219         } else {
1220                 regulator_bulk_disable(ARRAY_SIZE(ihid->pdata.supplies),
1221                                        ihid->pdata.supplies);
1222         }
1223
1224         return 0;
1225 }
1226
1227 static int i2c_hid_resume(struct device *dev)
1228 {
1229         int ret;
1230         struct i2c_client *client = to_i2c_client(dev);
1231         struct i2c_hid *ihid = i2c_get_clientdata(client);
1232         struct hid_device *hid = ihid->hid;
1233         int wake_status;
1234
1235         if (!device_may_wakeup(&client->dev)) {
1236                 ret = regulator_bulk_enable(ARRAY_SIZE(ihid->pdata.supplies),
1237                                             ihid->pdata.supplies);
1238                 if (ret)
1239                         hid_warn(hid, "Failed to enable supplies: %d\n", ret);
1240
1241                 if (ihid->pdata.post_power_delay_ms)
1242                         msleep(ihid->pdata.post_power_delay_ms);
1243         } else if (ihid->irq_wake_enabled) {
1244                 wake_status = disable_irq_wake(client->irq);
1245                 if (!wake_status)
1246                         ihid->irq_wake_enabled = false;
1247                 else
1248                         hid_warn(hid, "Failed to disable irq wake: %d\n",
1249                                 wake_status);
1250         }
1251
1252         /* We'll resume to full power */
1253         pm_runtime_disable(dev);
1254         pm_runtime_set_active(dev);
1255         pm_runtime_enable(dev);
1256
1257         enable_irq(client->irq);
1258
1259         /* Instead of resetting device, simply powers the device on. This
1260          * solves "incomplete reports" on Raydium devices 2386:3118 and
1261          * 2386:4B33 and fixes various SIS touchscreens no longer sending
1262          * data after a suspend/resume.
1263          */
1264         ret = i2c_hid_set_power(client, I2C_HID_PWR_ON);
1265         if (ret)
1266                 return ret;
1267
1268         if (hid->driver && hid->driver->reset_resume) {
1269                 ret = hid->driver->reset_resume(hid);
1270                 return ret;
1271         }
1272
1273         return 0;
1274 }
1275 #endif
1276
1277 #ifdef CONFIG_PM
1278 static int i2c_hid_runtime_suspend(struct device *dev)
1279 {
1280         struct i2c_client *client = to_i2c_client(dev);
1281
1282         i2c_hid_set_power(client, I2C_HID_PWR_SLEEP);
1283         disable_irq(client->irq);
1284         return 0;
1285 }
1286
1287 static int i2c_hid_runtime_resume(struct device *dev)
1288 {
1289         struct i2c_client *client = to_i2c_client(dev);
1290
1291         enable_irq(client->irq);
1292         i2c_hid_set_power(client, I2C_HID_PWR_ON);
1293         return 0;
1294 }
1295 #endif
1296
1297 static const struct dev_pm_ops i2c_hid_pm = {
1298         SET_SYSTEM_SLEEP_PM_OPS(i2c_hid_suspend, i2c_hid_resume)
1299         SET_RUNTIME_PM_OPS(i2c_hid_runtime_suspend, i2c_hid_runtime_resume,
1300                            NULL)
1301 };
1302
1303 static const struct i2c_device_id i2c_hid_id_table[] = {
1304         { "hid", 0 },
1305         { "hid-over-i2c", 0 },
1306         { },
1307 };
1308 MODULE_DEVICE_TABLE(i2c, i2c_hid_id_table);
1309
1310
1311 static struct i2c_driver i2c_hid_driver = {
1312         .driver = {
1313                 .name   = "i2c_hid",
1314                 .pm     = &i2c_hid_pm,
1315                 .acpi_match_table = ACPI_PTR(i2c_hid_acpi_match),
1316                 .of_match_table = of_match_ptr(i2c_hid_of_match),
1317         },
1318
1319         .probe          = i2c_hid_probe,
1320         .remove         = i2c_hid_remove,
1321         .shutdown       = i2c_hid_shutdown,
1322         .id_table       = i2c_hid_id_table,
1323 };
1324
1325 module_i2c_driver(i2c_hid_driver);
1326
1327 MODULE_DESCRIPTION("HID over I2C core driver");
1328 MODULE_AUTHOR("Benjamin Tissoires <benjamin.tissoires@gmail.com>");
1329 MODULE_LICENSE("GPL");