drivers/hid/i2c-hid/i2c-hid.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
  47 /* quirks to control the device */
  48 #define I2C_HID_QUIRK_SET_PWR_WAKEUP_DEV        BIT(0)
  49 #define I2C_HID_QUIRK_NO_IRQ_AFTER_RESET        BIT(1)
  50 #define I2C_HID_QUIRK_RESEND_REPORT_DESCR       BIT(2)
  51
  52 /* flags */
  53 #define I2C_HID_STARTED         0
  54 #define I2C_HID_RESET_PENDING   1
  55 #define I2C_HID_READ_PENDING    2
  56
  57 #define I2C_HID_PWR_ON          0x00
  58 #define I2C_HID_PWR_SLEEP       0x01
  59
  60 /* debug option */
  61 static bool debug;
  62 module_param(debug, bool, 0444);
  63 MODULE_PARM_DESC(debug, "print a lot of debug information");
  64
  65 #define i2c_hid_dbg(ihid, fmt, arg...)                                    \
  66 do {                                                                      \
  67         if (debug)                                                        \
  68                 dev_printk(KERN_DEBUG, &(ihid)->client->dev, fmt, ##arg); \
  69 } while (0)
  70
  71 struct i2c_hid_desc {
  72         __le16 wHIDDescLength;
  73         __le16 bcdVersion;
  74         __le16 wReportDescLength;
  75         __le16 wReportDescRegister;
  76         __le16 wInputRegister;
  77         __le16 wMaxInputLength;
  78         __le16 wOutputRegister;
  79         __le16 wMaxOutputLength;
  80         __le16 wCommandRegister;
  81         __le16 wDataRegister;
  82         __le16 wVendorID;
  83         __le16 wProductID;
  84         __le16 wVersionID;
  85         __le32 reserved;
  86 } __packed;
  87
  88 struct i2c_hid_cmd {
  89         unsigned int registerIndex;
  90         __u8 opcode;
  91         unsigned int length;
  92         bool wait;
  93 };
  94
  95 union command {
  96         u8 data[0];
  97         struct cmd {
  98                 __le16 reg;
  99                 __u8 reportTypeID;
 100                 __u8 opcode;
 101         } __packed c;
 102 };
 103
 104 #define I2C_HID_CMD(opcode_) \
 105         .opcode = opcode_, .length = 4, \
 106         .registerIndex = offsetof(struct i2c_hid_desc, wCommandRegister)
 107
 108 /* fetch HID descriptor */
 109 static const struct i2c_hid_cmd hid_descr_cmd = { .length = 2 };
 110 /* fetch report descriptors */
 111 static const struct i2c_hid_cmd hid_report_descr_cmd = {
 112                 .registerIndex = offsetof(struct i2c_hid_desc,
 113                         wReportDescRegister),
 114                 .opcode = 0x00,
 115                 .length = 2 };
 116 /* commands */
 117 static const struct i2c_hid_cmd hid_reset_cmd =         { I2C_HID_CMD(0x01),
 118                                                           .wait = true };
 119 static const struct i2c_hid_cmd hid_get_report_cmd =    { I2C_HID_CMD(0x02) };
 120 static const struct i2c_hid_cmd hid_set_report_cmd =    { I2C_HID_CMD(0x03) };
 121 static const struct i2c_hid_cmd hid_set_power_cmd =     { I2C_HID_CMD(0x08) };
 122 static const struct i2c_hid_cmd hid_no_cmd =            { .length = 0 };
 123
 124 /*
 125  * These definitions are not used here, but are defined by the spec.
 126  * Keeping them here for documentation purposes.
 127  *
 128  * static const struct i2c_hid_cmd hid_get_idle_cmd = { I2C_HID_CMD(0x04) };
 129  * static const struct i2c_hid_cmd hid_set_idle_cmd = { I2C_HID_CMD(0x05) };
 130  * static const struct i2c_hid_cmd hid_get_protocol_cmd = { I2C_HID_CMD(0x06) };
 131  * static const struct i2c_hid_cmd hid_set_protocol_cmd = { I2C_HID_CMD(0x07) };
 132  */
 133
 134 /* The main device structure */
 135 struct i2c_hid {
 136         struct i2c_client       *client;        /* i2c client */
 137         struct hid_device       *hid;   /* pointer to corresponding HID dev */
 138         union {
 139                 __u8 hdesc_buffer[sizeof(struct i2c_hid_desc)];
 140                 struct i2c_hid_desc hdesc;      /* the HID Descriptor */
 141         };
 142         __le16                  wHIDDescRegister; /* location of the i2c
 143                                                    * register of the HID
 144                                                    * descriptor. */
 145         unsigned int            bufsize;        /* i2c buffer size */
 146         u8                      *inbuf;         /* Input buffer */
 147         u8                      *rawbuf;        /* Raw Input buffer */
 148         u8                      *cmdbuf;        /* Command buffer */
 149         u8                      *argsbuf;       /* Command arguments buffer */
 150
 151         unsigned long           flags;          /* device flags */
 152         unsigned long           quirks;         /* Various quirks */
 153
 154         wait_queue_head_t       wait;           /* For waiting the interrupt */
 155
 156         struct i2c_hid_platform_data pdata;
 157
 158         bool                    irq_wake_enabled;
 159         struct mutex            reset_lock;
 160 };
 161
 162 static const struct i2c_hid_quirks {
 163         __u16 idVendor;
 164         __u16 idProduct;
 165         __u32 quirks;
 166 } i2c_hid_quirks[] = {
 167         { USB_VENDOR_ID_WEIDA, USB_DEVICE_ID_WEIDA_8752,
 168                 I2C_HID_QUIRK_SET_PWR_WAKEUP_DEV },
 169         { USB_VENDOR_ID_WEIDA, USB_DEVICE_ID_WEIDA_8755,
 170                 I2C_HID_QUIRK_SET_PWR_WAKEUP_DEV },
 171         { I2C_VENDOR_ID_HANTICK, I2C_PRODUCT_ID_HANTICK_5288,
 172                 I2C_HID_QUIRK_NO_IRQ_AFTER_RESET },
 173         { USB_VENDOR_ID_SIS_TOUCH, USB_DEVICE_ID_SIS10FB_TOUCH,
 174                 I2C_HID_QUIRK_RESEND_REPORT_DESCR },
 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
 673         i2c_hid_dbg(ihid, "entering %s\n", __func__);
 674
 675         rsize = le16_to_cpu(hdesc->wReportDescLength);
 676         if (!rsize || rsize > HID_MAX_DESCRIPTOR_SIZE) {
 677                 dbg_hid("weird size of report descriptor (%u)\n", rsize);
 678                 return -EINVAL;
 679         }
 680
 681         do {
 682                 ret = i2c_hid_hwreset(client);
 683                 if (ret)
 684                         msleep(1000);
 685         } while (tries-- > 0 && ret);
 686
 687         if (ret)
 688                 return ret;
 689
 690         rdesc = kzalloc(rsize, GFP_KERNEL);
 691
 692         if (!rdesc) {
 693                 dbg_hid("couldn't allocate rdesc memory\n");
 694                 return -ENOMEM;
 695         }
 696
 697         i2c_hid_dbg(ihid, "asking HID report descriptor\n");
 698
 699         ret = i2c_hid_command(client, &hid_report_descr_cmd, rdesc, rsize);
 700         if (ret) {
 701                 hid_err(hid, "reading report descriptor failed\n");
 702                 kfree(rdesc);
 703                 return -EIO;
 704         }
 705
 706         i2c_hid_dbg(ihid, "Report Descriptor: %*ph\n", rsize, rdesc);
 707
 708         ret = hid_parse_report(hid, rdesc, rsize);
 709         kfree(rdesc);
 710         if (ret) {
 711                 dbg_hid("parsing report descriptor failed\n");
 712                 return ret;
 713         }
 714
 715         return 0;
 716 }
 717
 718 static int i2c_hid_start(struct hid_device *hid)
 719 {
 720         struct i2c_client *client = hid->driver_data;
 721         struct i2c_hid *ihid = i2c_get_clientdata(client);
 722         int ret;
 723         unsigned int bufsize = HID_MIN_BUFFER_SIZE;
 724
 725         i2c_hid_find_max_report(hid, HID_INPUT_REPORT, &bufsize);
 726         i2c_hid_find_max_report(hid, HID_OUTPUT_REPORT, &bufsize);
 727         i2c_hid_find_max_report(hid, HID_FEATURE_REPORT, &bufsize);
 728
 729         if (bufsize > ihid->bufsize) {
 730                 disable_irq(client->irq);
 731                 i2c_hid_free_buffers(ihid);
 732
 733                 ret = i2c_hid_alloc_buffers(ihid, bufsize);
 734                 enable_irq(client->irq);
 735
 736                 if (ret)
 737                         return ret;
 738         }
 739
 740         return 0;
 741 }
 742
 743 static void i2c_hid_stop(struct hid_device *hid)
 744 {
 745         hid->claimed = 0;
 746 }
 747
 748 static int i2c_hid_open(struct hid_device *hid)
 749 {
 750         struct i2c_client *client = hid->driver_data;
 751         struct i2c_hid *ihid = i2c_get_clientdata(client);
 752         int ret = 0;
 753
 754         ret = pm_runtime_get_sync(&client->dev);
 755         if (ret < 0)
 756                 return ret;
 757
 758         set_bit(I2C_HID_STARTED, &ihid->flags);
 759         return 0;
 760 }
 761
 762 static void i2c_hid_close(struct hid_device *hid)
 763 {
 764         struct i2c_client *client = hid->driver_data;
 765         struct i2c_hid *ihid = i2c_get_clientdata(client);
 766
 767         clear_bit(I2C_HID_STARTED, &ihid->flags);
 768
 769         /* Save some power */
 770         pm_runtime_put(&client->dev);
 771 }
 772
 773 static int i2c_hid_power(struct hid_device *hid, int lvl)
 774 {
 775         struct i2c_client *client = hid->driver_data;
 776         struct i2c_hid *ihid = i2c_get_clientdata(client);
 777
 778         i2c_hid_dbg(ihid, "%s lvl:%d\n", __func__, lvl);
 779
 780         switch (lvl) {
 781         case PM_HINT_FULLON:
 782                 pm_runtime_get_sync(&client->dev);
 783                 break;
 784         case PM_HINT_NORMAL:
 785                 pm_runtime_put(&client->dev);
 786                 break;
 787         }
 788         return 0;
 789 }
 790
 791 struct hid_ll_driver i2c_hid_ll_driver = {
 792         .parse = i2c_hid_parse,
 793         .start = i2c_hid_start,
 794         .stop = i2c_hid_stop,
 795         .open = i2c_hid_open,
 796         .close = i2c_hid_close,
 797         .power = i2c_hid_power,
 798         .output_report = i2c_hid_output_report,
 799         .raw_request = i2c_hid_raw_request,
 800 };
 801 EXPORT_SYMBOL_GPL(i2c_hid_ll_driver);
 802
 803 static int i2c_hid_init_irq(struct i2c_client *client)
 804 {
 805         struct i2c_hid *ihid = i2c_get_clientdata(client);
 806         unsigned long irqflags = 0;
 807         int ret;
 808
 809         dev_dbg(&client->dev, "Requesting IRQ: %d\n", client->irq);
 810
 811         if (!irq_get_trigger_type(client->irq))
 812                 irqflags = IRQF_TRIGGER_LOW;
 813
 814         ret = request_threaded_irq(client->irq, NULL, i2c_hid_irq,
 815                                    irqflags | IRQF_ONESHOT, client->name, ihid);
 816         if (ret < 0) {
 817                 dev_warn(&client->dev,
 818                         "Could not register for %s interrupt, irq = %d,"
 819                         " ret = %d\n",
 820                         client->name, client->irq, ret);
 821
 822                 return ret;
 823         }
 824
 825         return 0;
 826 }
 827
 828 static int i2c_hid_fetch_hid_descriptor(struct i2c_hid *ihid)
 829 {
 830         struct i2c_client *client = ihid->client;
 831         struct i2c_hid_desc *hdesc = &ihid->hdesc;
 832         unsigned int dsize;
 833         int ret;
 834
 835         /* i2c hid fetch using a fixed descriptor size (30 bytes) */
 836         i2c_hid_dbg(ihid, "Fetching the HID descriptor\n");
 837         ret = i2c_hid_command(client, &hid_descr_cmd, ihid->hdesc_buffer,
 838                                 sizeof(struct i2c_hid_desc));
 839         if (ret) {
 840                 dev_err(&client->dev, "hid_descr_cmd failed\n");
 841                 return -ENODEV;
 842         }
 843
 844         /* Validate the length of HID descriptor, the 4 first bytes:
 845          * bytes 0-1 -> length
 846          * bytes 2-3 -> bcdVersion (has to be 1.00) */
 847         /* check bcdVersion == 1.0 */
 848         if (le16_to_cpu(hdesc->bcdVersion) != 0x0100) {
 849                 dev_err(&client->dev,
 850                         "unexpected HID descriptor bcdVersion (0x%04hx)\n",
 851                         le16_to_cpu(hdesc->bcdVersion));
 852                 return -ENODEV;
 853         }
 854
 855         /* Descriptor length should be 30 bytes as per the specification */
 856         dsize = le16_to_cpu(hdesc->wHIDDescLength);
 857         if (dsize != sizeof(struct i2c_hid_desc)) {
 858                 dev_err(&client->dev, "weird size of HID descriptor (%u)\n",
 859                         dsize);
 860                 return -ENODEV;
 861         }
 862         i2c_hid_dbg(ihid, "HID Descriptor: %*ph\n", dsize, ihid->hdesc_buffer);
 863         return 0;
 864 }
 865
 866 #ifdef CONFIG_ACPI
 867 static const struct acpi_device_id i2c_hid_acpi_blacklist[] = {
 868         /*
 869          * The CHPN0001 ACPI device, which is used to describe the Chipone
 870          * ICN8505 controller, has a _CID of PNP0C50 but is not HID compatible.
 871          */
 872         {"CHPN0001", 0 },
 873         { },
 874 };
 875
 876 static int i2c_hid_acpi_pdata(struct i2c_client *client,
 877                 struct i2c_hid_platform_data *pdata)
 878 {
 879         static guid_t i2c_hid_guid =
 880                 GUID_INIT(0x3CDFF6F7, 0x4267, 0x4555,
 881                           0xAD, 0x05, 0xB3, 0x0A, 0x3D, 0x89, 0x38, 0xDE);
 882         union acpi_object *obj;
 883         struct acpi_device *adev;
 884         acpi_handle handle;
 885
 886         handle = ACPI_HANDLE(&client->dev);
 887         if (!handle || acpi_bus_get_device(handle, &adev)) {
 888                 dev_err(&client->dev, "Error could not get ACPI device\n");
 889                 return -ENODEV;
 890         }
 891
 892         if (acpi_match_device_ids(adev, i2c_hid_acpi_blacklist) == 0)
 893                 return -ENODEV;
 894
 895         obj = acpi_evaluate_dsm_typed(handle, &i2c_hid_guid, 1, 1, NULL,
 896                                       ACPI_TYPE_INTEGER);
 897         if (!obj) {
 898                 dev_err(&client->dev, "Error _DSM call to get HID descriptor address failed\n");
 899                 return -ENODEV;
 900         }
 901
 902         pdata->hid_descriptor_address = obj->integer.value;
 903         ACPI_FREE(obj);
 904
 905         return 0;
 906 }
 907
 908 static void i2c_hid_acpi_fix_up_power(struct device *dev)
 909 {
 910         struct acpi_device *adev;
 911
 912         adev = ACPI_COMPANION(dev);
 913         if (adev)
 914                 acpi_device_fix_up_power(adev);
 915 }
 916
 917 static const struct acpi_device_id i2c_hid_acpi_match[] = {
 918         {"ACPI0C50", 0 },
 919         {"PNP0C50", 0 },
 920         { },
 921 };
 922 MODULE_DEVICE_TABLE(acpi, i2c_hid_acpi_match);
 923 #else
 924 static inline int i2c_hid_acpi_pdata(struct i2c_client *client,
 925                 struct i2c_hid_platform_data *pdata)
 926 {
 927         return -ENODEV;
 928 }
 929
 930 static inline void i2c_hid_acpi_fix_up_power(struct device *dev) {}
 931 #endif
 932
 933 #ifdef CONFIG_OF
 934 static int i2c_hid_of_probe(struct i2c_client *client,
 935                 struct i2c_hid_platform_data *pdata)
 936 {
 937         struct device *dev = &client->dev;
 938         u32 val;
 939         int ret;
 940
 941         ret = of_property_read_u32(dev->of_node, "hid-descr-addr", &val);
 942         if (ret) {
 943                 dev_err(&client->dev, "HID register address not provided\n");
 944                 return -ENODEV;
 945         }
 946         if (val >> 16) {
 947                 dev_err(&client->dev, "Bad HID register address: 0x%08x\n",
 948                         val);
 949                 return -EINVAL;
 950         }
 951         pdata->hid_descriptor_address = val;
 952
 953         return 0;
 954 }
 955
 956 static const struct of_device_id i2c_hid_of_match[] = {
 957         { .compatible = "hid-over-i2c" },
 958         {},
 959 };
 960 MODULE_DEVICE_TABLE(of, i2c_hid_of_match);
 961 #else
 962 static inline int i2c_hid_of_probe(struct i2c_client *client,
 963                 struct i2c_hid_platform_data *pdata)
 964 {
 965         return -ENODEV;
 966 }
 967 #endif
 968
 969 static void i2c_hid_fwnode_probe(struct i2c_client *client,
 970                                  struct i2c_hid_platform_data *pdata)
 971 {
 972         u32 val;
 973
 974         if (!device_property_read_u32(&client->dev, "post-power-on-delay-ms",
 975                                       &val))
 976                 pdata->post_power_delay_ms = val;
 977 }
 978
 979 static int i2c_hid_probe(struct i2c_client *client,
 980                          const struct i2c_device_id *dev_id)
 981 {
 982         int ret;
 983         struct i2c_hid *ihid;
 984         struct hid_device *hid;
 985         __u16 hidRegister;
 986         struct i2c_hid_platform_data *platform_data = client->dev.platform_data;
 987
 988         dbg_hid("HID probe called for i2c 0x%02x\n", client->addr);
 989
 990         if (!client->irq) {
 991                 dev_err(&client->dev,
 992                         "HID over i2c has not been provided an Int IRQ\n");
 993                 return -EINVAL;
 994         }
 995
 996         if (client->irq < 0) {
 997                 if (client->irq != -EPROBE_DEFER)
 998                         dev_err(&client->dev,
 999                                 "HID over i2c doesn't have a valid IRQ\n");
1000                 return client->irq;
1001         }
1002
1003         ihid = devm_kzalloc(&client->dev, sizeof(*ihid), GFP_KERNEL);
1004         if (!ihid)
1005                 return -ENOMEM;
1006
1007         if (client->dev.of_node) {
1008                 ret = i2c_hid_of_probe(client, &ihid->pdata);
1009                 if (ret)
1010                         return ret;
1011         } else if (!platform_data) {
1012                 ret = i2c_hid_acpi_pdata(client, &ihid->pdata);
1013                 if (ret)
1014                         return ret;
1015         } else {
1016                 ihid->pdata = *platform_data;
1017         }
1018
1019         /* Parse platform agnostic common properties from ACPI / device tree */
1020         i2c_hid_fwnode_probe(client, &ihid->pdata);
1021
1022         ihid->pdata.supplies[0].supply = "vdd";
1023         ihid->pdata.supplies[1].supply = "vddl";
1024
1025         ret = devm_regulator_bulk_get(&client->dev,
1026                                       ARRAY_SIZE(ihid->pdata.supplies),
1027                                       ihid->pdata.supplies);
1028         if (ret)
1029                 return ret;
1030
1031         ret = regulator_bulk_enable(ARRAY_SIZE(ihid->pdata.supplies),
1032                                     ihid->pdata.supplies);
1033         if (ret < 0)
1034                 return ret;
1035
1036         if (ihid->pdata.post_power_delay_ms)
1037                 msleep(ihid->pdata.post_power_delay_ms);
1038
1039         i2c_set_clientdata(client, ihid);
1040
1041         ihid->client = client;
1042
1043         hidRegister = ihid->pdata.hid_descriptor_address;
1044         ihid->wHIDDescRegister = cpu_to_le16(hidRegister);
1045
1046         init_waitqueue_head(&ihid->wait);
1047         mutex_init(&ihid->reset_lock);
1048
1049         /* we need to allocate the command buffer without knowing the maximum
1050          * size of the reports. Let's use HID_MIN_BUFFER_SIZE, then we do the
1051          * real computation later. */
1052         ret = i2c_hid_alloc_buffers(ihid, HID_MIN_BUFFER_SIZE);
1053         if (ret < 0)
1054                 goto err_regulator;
1055
1056         i2c_hid_acpi_fix_up_power(&client->dev);
1057
1058         pm_runtime_get_noresume(&client->dev);
1059         pm_runtime_set_active(&client->dev);
1060         pm_runtime_enable(&client->dev);
1061         device_enable_async_suspend(&client->dev);
1062
1063         /* Make sure there is something at this address */
1064         ret = i2c_smbus_read_byte(client);
1065         if (ret < 0) {
1066                 dev_dbg(&client->dev, "nothing at this address: %d\n", ret);
1067                 ret = -ENXIO;
1068                 goto err_pm;
1069         }
1070
1071         ret = i2c_hid_fetch_hid_descriptor(ihid);
1072         if (ret < 0)
1073                 goto err_pm;
1074
1075         ret = i2c_hid_init_irq(client);
1076         if (ret < 0)
1077                 goto err_pm;
1078
1079         hid = hid_allocate_device();
1080         if (IS_ERR(hid)) {
1081                 ret = PTR_ERR(hid);
1082                 goto err_irq;
1083         }
1084
1085         ihid->hid = hid;
1086
1087         hid->driver_data = client;
1088         hid->ll_driver = &i2c_hid_ll_driver;
1089         hid->dev.parent = &client->dev;
1090         hid->bus = BUS_I2C;
1091         hid->version = le16_to_cpu(ihid->hdesc.bcdVersion);
1092         hid->vendor = le16_to_cpu(ihid->hdesc.wVendorID);
1093         hid->product = le16_to_cpu(ihid->hdesc.wProductID);
1094
1095         snprintf(hid->name, sizeof(hid->name), "%s %04hX:%04hX",
1096                  client->name, hid->vendor, hid->product);
1097         strlcpy(hid->phys, dev_name(&client->dev), sizeof(hid->phys));
1098
1099         ihid->quirks = i2c_hid_lookup_quirk(hid->vendor, hid->product);
1100
1101         ret = hid_add_device(hid);
1102         if (ret) {
1103                 if (ret != -ENODEV)
1104                         hid_err(client, "can't add hid device: %d\n", ret);
1105                 goto err_mem_free;
1106         }
1107
1108         pm_runtime_put(&client->dev);
1109         return 0;
1110
1111 err_mem_free:
1112         hid_destroy_device(hid);
1113
1114 err_irq:
1115         free_irq(client->irq, ihid);
1116
1117 err_pm:
1118         pm_runtime_put_noidle(&client->dev);
1119         pm_runtime_disable(&client->dev);
1120
1121 err_regulator:
1122         regulator_bulk_disable(ARRAY_SIZE(ihid->pdata.supplies),
1123                                ihid->pdata.supplies);
1124         i2c_hid_free_buffers(ihid);
1125         return ret;
1126 }
1127
1128 static int i2c_hid_remove(struct i2c_client *client)
1129 {
1130         struct i2c_hid *ihid = i2c_get_clientdata(client);
1131         struct hid_device *hid;
1132
1133         pm_runtime_get_sync(&client->dev);
1134         pm_runtime_disable(&client->dev);
1135         pm_runtime_set_suspended(&client->dev);
1136         pm_runtime_put_noidle(&client->dev);
1137
1138         hid = ihid->hid;
1139         hid_destroy_device(hid);
1140
1141         free_irq(client->irq, ihid);
1142
1143         if (ihid->bufsize)
1144                 i2c_hid_free_buffers(ihid);
1145
1146         regulator_bulk_disable(ARRAY_SIZE(ihid->pdata.supplies),
1147                                ihid->pdata.supplies);
1148
1149         return 0;
1150 }
1151
1152 static void i2c_hid_shutdown(struct i2c_client *client)
1153 {
1154         struct i2c_hid *ihid = i2c_get_clientdata(client);
1155
1156         i2c_hid_set_power(client, I2C_HID_PWR_SLEEP);
1157         free_irq(client->irq, ihid);
1158 }
1159
1160 #ifdef CONFIG_PM_SLEEP
1161 static int i2c_hid_suspend(struct device *dev)
1162 {
1163         struct i2c_client *client = to_i2c_client(dev);
1164         struct i2c_hid *ihid = i2c_get_clientdata(client);
1165         struct hid_device *hid = ihid->hid;
1166         int ret;
1167         int wake_status;
1168
1169         if (hid->driver && hid->driver->suspend) {
1170                 /*
1171                  * Wake up the device so that IO issues in
1172                  * HID driver's suspend code can succeed.
1173                  */
1174                 ret = pm_runtime_resume(dev);
1175                 if (ret < 0)
1176                         return ret;
1177
1178                 ret = hid->driver->suspend(hid, PMSG_SUSPEND);
1179                 if (ret < 0)
1180                         return ret;
1181         }
1182
1183         if (!pm_runtime_suspended(dev)) {
1184                 /* Save some power */
1185                 i2c_hid_set_power(client, I2C_HID_PWR_SLEEP);
1186
1187                 disable_irq(client->irq);
1188         }
1189
1190         if (device_may_wakeup(&client->dev)) {
1191                 wake_status = enable_irq_wake(client->irq);
1192                 if (!wake_status)
1193                         ihid->irq_wake_enabled = true;
1194                 else
1195                         hid_warn(hid, "Failed to enable irq wake: %d\n",
1196                                 wake_status);
1197         } else {
1198                 regulator_bulk_disable(ARRAY_SIZE(ihid->pdata.supplies),
1199                                        ihid->pdata.supplies);
1200         }
1201
1202         return 0;
1203 }
1204
1205 static int i2c_hid_resume(struct device *dev)
1206 {
1207         int ret;
1208         struct i2c_client *client = to_i2c_client(dev);
1209         struct i2c_hid *ihid = i2c_get_clientdata(client);
1210         struct hid_device *hid = ihid->hid;
1211         int wake_status;
1212
1213         if (!device_may_wakeup(&client->dev)) {
1214                 ret = regulator_bulk_enable(ARRAY_SIZE(ihid->pdata.supplies),
1215                                             ihid->pdata.supplies);
1216                 if (ret)
1217                         hid_warn(hid, "Failed to enable supplies: %d\n", ret);
1218
1219                 if (ihid->pdata.post_power_delay_ms)
1220                         msleep(ihid->pdata.post_power_delay_ms);
1221         } else if (ihid->irq_wake_enabled) {
1222                 wake_status = disable_irq_wake(client->irq);
1223                 if (!wake_status)
1224                         ihid->irq_wake_enabled = false;
1225                 else
1226                         hid_warn(hid, "Failed to disable irq wake: %d\n",
1227                                 wake_status);
1228         }
1229
1230         /* We'll resume to full power */
1231         pm_runtime_disable(dev);
1232         pm_runtime_set_active(dev);
1233         pm_runtime_enable(dev);
1234
1235         enable_irq(client->irq);
1236
1237         /* Instead of resetting device, simply powers the device on. This
1238          * solves "incomplete reports" on Raydium devices 2386:3118 and
1239          * 2386:4B33
1240          */
1241         ret = i2c_hid_set_power(client, I2C_HID_PWR_ON);
1242         if (ret)
1243                 return ret;
1244
1245         /* Some devices need to re-send report descr cmd
1246          * after resume, after this it will be back normal.
1247          * otherwise it issues too many incomplete reports.
1248          */
1249         if (ihid->quirks & I2C_HID_QUIRK_RESEND_REPORT_DESCR) {
1250                 ret = i2c_hid_command(client, &hid_report_descr_cmd, NULL, 0);
1251                 if (ret)
1252                         return ret;
1253         }
1254
1255         if (hid->driver && hid->driver->reset_resume) {
1256                 ret = hid->driver->reset_resume(hid);
1257                 return ret;
1258         }
1259
1260         return 0;
1261 }
1262 #endif
1263
1264 #ifdef CONFIG_PM
1265 static int i2c_hid_runtime_suspend(struct device *dev)
1266 {
1267         struct i2c_client *client = to_i2c_client(dev);
1268
1269         i2c_hid_set_power(client, I2C_HID_PWR_SLEEP);
1270         disable_irq(client->irq);
1271         return 0;
1272 }
1273
1274 static int i2c_hid_runtime_resume(struct device *dev)
1275 {
1276         struct i2c_client *client = to_i2c_client(dev);
1277
1278         enable_irq(client->irq);
1279         i2c_hid_set_power(client, I2C_HID_PWR_ON);
1280         return 0;
1281 }
1282 #endif
1283
1284 static const struct dev_pm_ops i2c_hid_pm = {
1285         SET_SYSTEM_SLEEP_PM_OPS(i2c_hid_suspend, i2c_hid_resume)
1286         SET_RUNTIME_PM_OPS(i2c_hid_runtime_suspend, i2c_hid_runtime_resume,
1287                            NULL)
1288 };
1289
1290 static const struct i2c_device_id i2c_hid_id_table[] = {
1291         { "hid", 0 },
1292         { "hid-over-i2c", 0 },
1293         { },
1294 };
1295 MODULE_DEVICE_TABLE(i2c, i2c_hid_id_table);
1296
1297
1298 static struct i2c_driver i2c_hid_driver = {
1299         .driver = {
1300                 .name   = "i2c_hid",
1301                 .pm     = &i2c_hid_pm,
1302                 .acpi_match_table = ACPI_PTR(i2c_hid_acpi_match),
1303                 .of_match_table = of_match_ptr(i2c_hid_of_match),
1304         },
1305
1306         .probe          = i2c_hid_probe,
1307         .remove         = i2c_hid_remove,
1308         .shutdown       = i2c_hid_shutdown,
1309         .id_table       = i2c_hid_id_table,
1310 };
1311
1312 module_i2c_driver(i2c_hid_driver);
1313
1314 MODULE_DESCRIPTION("HID over I2C core driver");
1315 MODULE_AUTHOR("Benjamin Tissoires <benjamin.tissoires@gmail.com>");
1316 MODULE_LICENSE("GPL");