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

   1 /*
   2  * HID over I2C protocol implementation
   3  *
   4  * Copyright (c) 2012 Benjamin Tissoires <benjamin.tissoires@gmail.com>
   5  * Copyright (c) 2012 Ecole Nationale de l'Aviation Civile, France
   6  * Copyright (c) 2012 Red Hat, Inc
   7  *
   8  * This code is partly based on "USB HID support for Linux":
   9  *
  10  *  Copyright (c) 1999 Andreas Gal
  11  *  Copyright (c) 2000-2005 Vojtech Pavlik <vojtech@suse.cz>
  12  *  Copyright (c) 2005 Michael Haboustak <mike-@cinci.rr.com> for Concept2, Inc
  13  *  Copyright (c) 2007-2008 Oliver Neukum
  14  *  Copyright (c) 2006-2010 Jiri Kosina
  15  *
  16  * This file is subject to the terms and conditions of the GNU General Public
  17  * License.  See the file COPYING in the main directory of this archive for
  18  * more details.
  19  */
  20
  21 #include <linux/module.h>
  22 #include <linux/i2c.h>
  23 #include <linux/interrupt.h>
  24 #include <linux/input.h>
  25 #include <linux/irq.h>
  26 #include <linux/delay.h>
  27 #include <linux/slab.h>
  28 #include <linux/pm.h>
  29 #include <linux/device.h>
  30 #include <linux/wait.h>
  31 #include <linux/err.h>
  32 #include <linux/string.h>
  33 #include <linux/list.h>
  34 #include <linux/jiffies.h>
  35 #include <linux/kernel.h>
  36 #include <linux/hid.h>
  37 #include <linux/mutex.h>
  38 #include <linux/acpi.h>
  39 #include <linux/of.h>
  40 #include <linux/regulator/consumer.h>
  41
  42 #include <linux/platform_data/i2c-hid.h>
  43
  44 #include "../hid-ids.h"
  45 #include "i2c-hid.h"
  46
  47 /* quirks to control the device */
  48 #define I2C_HID_QUIRK_SET_PWR_WAKEUP_DEV        BIT(0)
  49 #define I2C_HID_QUIRK_NO_IRQ_AFTER_RESET        BIT(1)
  50 #define I2C_HID_QUIRK_BOGUS_IRQ                 BIT(4)
  51 #define I2C_HID_QUIRK_RESET_ON_RESUME           BIT(5)
  52
  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, HID_ANY_ID,
 169                 I2C_HID_QUIRK_SET_PWR_WAKEUP_DEV },
 170         { I2C_VENDOR_ID_HANTICK, I2C_PRODUCT_ID_HANTICK_5288,
 171                 I2C_HID_QUIRK_NO_IRQ_AFTER_RESET },
 172         { I2C_VENDOR_ID_RAYDIUM, I2C_PRODUCT_ID_RAYDIUM_3118,
 173                 I2C_HID_QUIRK_NO_IRQ_AFTER_RESET },
 174         { USB_VENDOR_ID_ELAN, HID_ANY_ID,
 175                  I2C_HID_QUIRK_BOGUS_IRQ },
 176         { USB_VENDOR_ID_ALPS_JP, HID_ANY_ID,
 177                  I2C_HID_QUIRK_RESET_ON_RESUME },
 178         { 0, 0 }
 179 };
 180
 181 /*
 182  * i2c_hid_lookup_quirk: return any quirks associated with a I2C HID device
 183  * @idVendor: the 16-bit vendor ID
 184  * @idProduct: the 16-bit product ID
 185  *
 186  * Returns: a u32 quirks value.
 187  */
 188 static u32 i2c_hid_lookup_quirk(const u16 idVendor, const u16 idProduct)
 189 {
 190         u32 quirks = 0;
 191         int n;
 192
 193         for (n = 0; i2c_hid_quirks[n].idVendor; n++)
 194                 if (i2c_hid_quirks[n].idVendor == idVendor &&
 195                     (i2c_hid_quirks[n].idProduct == (__u16)HID_ANY_ID ||
 196                      i2c_hid_quirks[n].idProduct == idProduct))
 197                         quirks = i2c_hid_quirks[n].quirks;
 198
 199         return quirks;
 200 }
 201
 202 static int __i2c_hid_command(struct i2c_client *client,
 203                 const struct i2c_hid_cmd *command, u8 reportID,
 204                 u8 reportType, u8 *args, int args_len,
 205                 unsigned char *buf_recv, int data_len)
 206 {
 207         struct i2c_hid *ihid = i2c_get_clientdata(client);
 208         union command *cmd = (union command *)ihid->cmdbuf;
 209         int ret;
 210         struct i2c_msg msg[2];
 211         int msg_num = 1;
 212
 213         int length = command->length;
 214         bool wait = command->wait;
 215         unsigned int registerIndex = command->registerIndex;
 216
 217         /* special case for hid_descr_cmd */
 218         if (command == &hid_descr_cmd) {
 219                 cmd->c.reg = ihid->wHIDDescRegister;
 220         } else {
 221                 cmd->data[0] = ihid->hdesc_buffer[registerIndex];
 222                 cmd->data[1] = ihid->hdesc_buffer[registerIndex + 1];
 223         }
 224
 225         if (length > 2) {
 226                 cmd->c.opcode = command->opcode;
 227                 cmd->c.reportTypeID = reportID | reportType << 4;
 228         }
 229
 230         memcpy(cmd->data + length, args, args_len);
 231         length += args_len;
 232
 233         i2c_hid_dbg(ihid, "%s: cmd=%*ph\n", __func__, length, cmd->data);
 234
 235         msg[0].addr = client->addr;
 236         msg[0].flags = client->flags & I2C_M_TEN;
 237         msg[0].len = length;
 238         msg[0].buf = cmd->data;
 239         if (data_len > 0) {
 240                 msg[1].addr = client->addr;
 241                 msg[1].flags = client->flags & I2C_M_TEN;
 242                 msg[1].flags |= I2C_M_RD;
 243                 msg[1].len = data_len;
 244                 msg[1].buf = buf_recv;
 245                 msg_num = 2;
 246                 set_bit(I2C_HID_READ_PENDING, &ihid->flags);
 247         }
 248
 249         if (wait)
 250                 set_bit(I2C_HID_RESET_PENDING, &ihid->flags);
 251
 252         ret = i2c_transfer(client->adapter, msg, msg_num);
 253
 254         if (data_len > 0)
 255                 clear_bit(I2C_HID_READ_PENDING, &ihid->flags);
 256
 257         if (ret != msg_num)
 258                 return ret < 0 ? ret : -EIO;
 259
 260         ret = 0;
 261
 262         if (wait && (ihid->quirks & I2C_HID_QUIRK_NO_IRQ_AFTER_RESET)) {
 263                 msleep(100);
 264         } else if (wait) {
 265                 i2c_hid_dbg(ihid, "%s: waiting...\n", __func__);
 266                 if (!wait_event_timeout(ihid->wait,
 267                                 !test_bit(I2C_HID_RESET_PENDING, &ihid->flags),
 268                                 msecs_to_jiffies(5000)))
 269                         ret = -ENODATA;
 270                 i2c_hid_dbg(ihid, "%s: finished.\n", __func__);
 271         }
 272
 273         return ret;
 274 }
 275
 276 static int i2c_hid_command(struct i2c_client *client,
 277                 const struct i2c_hid_cmd *command,
 278                 unsigned char *buf_recv, int data_len)
 279 {
 280         return __i2c_hid_command(client, command, 0, 0, NULL, 0,
 281                                 buf_recv, data_len);
 282 }
 283
 284 static int i2c_hid_get_report(struct i2c_client *client, u8 reportType,
 285                 u8 reportID, unsigned char *buf_recv, int data_len)
 286 {
 287         struct i2c_hid *ihid = i2c_get_clientdata(client);
 288         u8 args[3];
 289         int ret;
 290         int args_len = 0;
 291         u16 readRegister = le16_to_cpu(ihid->hdesc.wDataRegister);
 292
 293         i2c_hid_dbg(ihid, "%s\n", __func__);
 294
 295         if (reportID >= 0x0F) {
 296                 args[args_len++] = reportID;
 297                 reportID = 0x0F;
 298         }
 299
 300         args[args_len++] = readRegister & 0xFF;
 301         args[args_len++] = readRegister >> 8;
 302
 303         ret = __i2c_hid_command(client, &hid_get_report_cmd, reportID,
 304                 reportType, args, args_len, buf_recv, data_len);
 305         if (ret) {
 306                 dev_err(&client->dev,
 307                         "failed to retrieve report from device.\n");
 308                 return ret;
 309         }
 310
 311         return 0;
 312 }
 313
 314 /**
 315  * i2c_hid_set_or_send_report: forward an incoming report to the device
 316  * @client: the i2c_client of the device
 317  * @reportType: 0x03 for HID_FEATURE_REPORT ; 0x02 for HID_OUTPUT_REPORT
 318  * @reportID: the report ID
 319  * @buf: the actual data to transfer, without the report ID
 320  * @len: size of buf
 321  * @use_data: true: use SET_REPORT HID command, false: send plain OUTPUT report
 322  */
 323 static int i2c_hid_set_or_send_report(struct i2c_client *client, u8 reportType,
 324                 u8 reportID, unsigned char *buf, size_t data_len, bool use_data)
 325 {
 326         struct i2c_hid *ihid = i2c_get_clientdata(client);
 327         u8 *args = ihid->argsbuf;
 328         const struct i2c_hid_cmd *hidcmd;
 329         int ret;
 330         u16 dataRegister = le16_to_cpu(ihid->hdesc.wDataRegister);
 331         u16 outputRegister = le16_to_cpu(ihid->hdesc.wOutputRegister);
 332         u16 maxOutputLength = le16_to_cpu(ihid->hdesc.wMaxOutputLength);
 333         u16 size;
 334         int args_len;
 335         int index = 0;
 336
 337         i2c_hid_dbg(ihid, "%s\n", __func__);
 338
 339         if (data_len > ihid->bufsize)
 340                 return -EINVAL;
 341
 342         size =          2                       /* size */ +
 343                         (reportID ? 1 : 0)      /* reportID */ +
 344                         data_len                /* buf */;
 345         args_len =      (reportID >= 0x0F ? 1 : 0) /* optional third byte */ +
 346                         2                       /* dataRegister */ +
 347                         size                    /* args */;
 348
 349         if (!use_data && maxOutputLength == 0)
 350                 return -ENOSYS;
 351
 352         if (reportID >= 0x0F) {
 353                 args[index++] = reportID;
 354                 reportID = 0x0F;
 355         }
 356
 357         /*
 358          * use the data register for feature reports or if the device does not
 359          * support the output register
 360          */
 361         if (use_data) {
 362                 args[index++] = dataRegister & 0xFF;
 363                 args[index++] = dataRegister >> 8;
 364                 hidcmd = &hid_set_report_cmd;
 365         } else {
 366                 args[index++] = outputRegister & 0xFF;
 367                 args[index++] = outputRegister >> 8;
 368                 hidcmd = &hid_no_cmd;
 369         }
 370
 371         args[index++] = size & 0xFF;
 372         args[index++] = size >> 8;
 373
 374         if (reportID)
 375                 args[index++] = reportID;
 376
 377         memcpy(&args[index], buf, data_len);
 378
 379         ret = __i2c_hid_command(client, hidcmd, reportID,
 380                 reportType, args, args_len, NULL, 0);
 381         if (ret) {
 382                 dev_err(&client->dev, "failed to set a report to device.\n");
 383                 return ret;
 384         }
 385
 386         return data_len;
 387 }
 388
 389 static int i2c_hid_set_power(struct i2c_client *client, int power_state)
 390 {
 391         struct i2c_hid *ihid = i2c_get_clientdata(client);
 392         int ret;
 393
 394         i2c_hid_dbg(ihid, "%s\n", __func__);
 395
 396         /*
 397          * Some devices require to send a command to wakeup before power on.
 398          * The call will get a return value (EREMOTEIO) but device will be
 399          * triggered and activated. After that, it goes like a normal device.
 400          */
 401         if (power_state == I2C_HID_PWR_ON &&
 402             ihid->quirks & I2C_HID_QUIRK_SET_PWR_WAKEUP_DEV) {
 403                 ret = i2c_hid_command(client, &hid_set_power_cmd, NULL, 0);
 404
 405                 /* Device was already activated */
 406                 if (!ret)
 407                         goto set_pwr_exit;
 408         }
 409
 410         ret = __i2c_hid_command(client, &hid_set_power_cmd, power_state,
 411                 0, NULL, 0, NULL, 0);
 412
 413         if (ret)
 414                 dev_err(&client->dev, "failed to change power setting.\n");
 415
 416 set_pwr_exit:
 417         return ret;
 418 }
 419
 420 static int i2c_hid_hwreset(struct i2c_client *client)
 421 {
 422         struct i2c_hid *ihid = i2c_get_clientdata(client);
 423         int ret;
 424
 425         i2c_hid_dbg(ihid, "%s\n", __func__);
 426
 427         /*
 428          * This prevents sending feature reports while the device is
 429          * being reset. Otherwise we may lose the reset complete
 430          * interrupt.
 431          */
 432         mutex_lock(&ihid->reset_lock);
 433
 434         ret = i2c_hid_set_power(client, I2C_HID_PWR_ON);
 435         if (ret)
 436                 goto out_unlock;
 437
 438         /*
 439          * The HID over I2C specification states that if a DEVICE needs time
 440          * after the PWR_ON request, it should utilise CLOCK stretching.
 441          * However, it has been observered that the Windows driver provides a
 442          * 1ms sleep between the PWR_ON and RESET requests and that some devices
 443          * rely on this.
 444          */
 445         usleep_range(1000, 5000);
 446
 447         i2c_hid_dbg(ihid, "resetting...\n");
 448
 449         ret = i2c_hid_command(client, &hid_reset_cmd, NULL, 0);
 450         if (ret) {
 451                 dev_err(&client->dev, "failed to reset device.\n");
 452                 i2c_hid_set_power(client, I2C_HID_PWR_SLEEP);
 453                 goto out_unlock;
 454         }
 455
 456         /* At least some SIS devices need this after reset */
 457         ret = i2c_hid_set_power(client, I2C_HID_PWR_ON);
 458
 459 out_unlock:
 460         mutex_unlock(&ihid->reset_lock);
 461         return ret;
 462 }
 463
 464 static void i2c_hid_get_input(struct i2c_hid *ihid)
 465 {
 466         int ret;
 467         u32 ret_size;
 468         int size = le16_to_cpu(ihid->hdesc.wMaxInputLength);
 469
 470         if (size > ihid->bufsize)
 471                 size = ihid->bufsize;
 472
 473         ret = i2c_master_recv(ihid->client, ihid->inbuf, size);
 474         if (ret != size) {
 475                 if (ret < 0)
 476                         return;
 477
 478                 dev_err(&ihid->client->dev, "%s: got %d data instead of %d\n",
 479                         __func__, ret, size);
 480                 return;
 481         }
 482
 483         ret_size = ihid->inbuf[0] | ihid->inbuf[1] << 8;
 484
 485         if (!ret_size) {
 486                 /* host or device initiated RESET completed */
 487                 if (test_and_clear_bit(I2C_HID_RESET_PENDING, &ihid->flags))
 488                         wake_up(&ihid->wait);
 489                 return;
 490         }
 491
 492         if (ihid->quirks & I2C_HID_QUIRK_BOGUS_IRQ && ret_size == 0xffff) {
 493                 dev_warn_once(&ihid->client->dev, "%s: IRQ triggered but "
 494                               "there's no data\n", __func__);
 495                 return;
 496         }
 497
 498         if ((ret_size > size) || (ret_size < 2)) {
 499                 dev_err(&ihid->client->dev, "%s: incomplete report (%d/%d)\n",
 500                         __func__, size, ret_size);
 501                 return;
 502         }
 503
 504         i2c_hid_dbg(ihid, "input: %*ph\n", ret_size, ihid->inbuf);
 505
 506         if (test_bit(I2C_HID_STARTED, &ihid->flags))
 507                 hid_input_report(ihid->hid, HID_INPUT_REPORT, ihid->inbuf + 2,
 508                                 ret_size - 2, 1);
 509
 510         return;
 511 }
 512
 513 static irqreturn_t i2c_hid_irq(int irq, void *dev_id)
 514 {
 515         struct i2c_hid *ihid = dev_id;
 516
 517         if (test_bit(I2C_HID_READ_PENDING, &ihid->flags))
 518                 return IRQ_HANDLED;
 519
 520         i2c_hid_get_input(ihid);
 521
 522         return IRQ_HANDLED;
 523 }
 524
 525 static int i2c_hid_get_report_length(struct hid_report *report)
 526 {
 527         return ((report->size - 1) >> 3) + 1 +
 528                 report->device->report_enum[report->type].numbered + 2;
 529 }
 530
 531 /*
 532  * Traverse the supplied list of reports and find the longest
 533  */
 534 static void i2c_hid_find_max_report(struct hid_device *hid, unsigned int type,
 535                 unsigned int *max)
 536 {
 537         struct hid_report *report;
 538         unsigned int size;
 539
 540         /* We should not rely on wMaxInputLength, as some devices may set it to
 541          * a wrong length. */
 542         list_for_each_entry(report, &hid->report_enum[type].report_list, list) {
 543                 size = i2c_hid_get_report_length(report);
 544                 if (*max < size)
 545                         *max = size;
 546         }
 547 }
 548
 549 static void i2c_hid_free_buffers(struct i2c_hid *ihid)
 550 {
 551         kfree(ihid->inbuf);
 552         kfree(ihid->rawbuf);
 553         kfree(ihid->argsbuf);
 554         kfree(ihid->cmdbuf);
 555         ihid->inbuf = NULL;
 556         ihid->rawbuf = NULL;
 557         ihid->cmdbuf = NULL;
 558         ihid->argsbuf = NULL;
 559         ihid->bufsize = 0;
 560 }
 561
 562 static int i2c_hid_alloc_buffers(struct i2c_hid *ihid, size_t report_size)
 563 {
 564         /* the worst case is computed from the set_report command with a
 565          * reportID > 15 and the maximum report length */
 566         int args_len = sizeof(__u8) + /* ReportID */
 567                        sizeof(__u8) + /* optional ReportID byte */
 568                        sizeof(__u16) + /* data register */
 569                        sizeof(__u16) + /* size of the report */
 570                        report_size; /* report */
 571
 572         ihid->inbuf = kzalloc(report_size, GFP_KERNEL);
 573         ihid->rawbuf = kzalloc(report_size, GFP_KERNEL);
 574         ihid->argsbuf = kzalloc(args_len, GFP_KERNEL);
 575         ihid->cmdbuf = kzalloc(sizeof(union command) + args_len, GFP_KERNEL);
 576
 577         if (!ihid->inbuf || !ihid->rawbuf || !ihid->argsbuf || !ihid->cmdbuf) {
 578                 i2c_hid_free_buffers(ihid);
 579                 return -ENOMEM;
 580         }
 581
 582         ihid->bufsize = report_size;
 583
 584         return 0;
 585 }
 586
 587 static int i2c_hid_get_raw_report(struct hid_device *hid,
 588                 unsigned char report_number, __u8 *buf, size_t count,
 589                 unsigned char report_type)
 590 {
 591         struct i2c_client *client = hid->driver_data;
 592         struct i2c_hid *ihid = i2c_get_clientdata(client);
 593         size_t ret_count, ask_count;
 594         int ret;
 595
 596         if (report_type == HID_OUTPUT_REPORT)
 597                 return -EINVAL;
 598
 599         /* +2 bytes to include the size of the reply in the query buffer */
 600         ask_count = min(count + 2, (size_t)ihid->bufsize);
 601
 602         ret = i2c_hid_get_report(client,
 603                         report_type == HID_FEATURE_REPORT ? 0x03 : 0x01,
 604                         report_number, ihid->rawbuf, ask_count);
 605
 606         if (ret < 0)
 607                 return ret;
 608
 609         ret_count = ihid->rawbuf[0] | (ihid->rawbuf[1] << 8);
 610
 611         if (ret_count <= 2)
 612                 return 0;
 613
 614         ret_count = min(ret_count, ask_count);
 615
 616         /* The query buffer contains the size, dropping it in the reply */
 617         count = min(count, ret_count - 2);
 618         memcpy(buf, ihid->rawbuf + 2, count);
 619
 620         return count;
 621 }
 622
 623 static int i2c_hid_output_raw_report(struct hid_device *hid, __u8 *buf,
 624                 size_t count, unsigned char report_type, bool use_data)
 625 {
 626         struct i2c_client *client = hid->driver_data;
 627         struct i2c_hid *ihid = i2c_get_clientdata(client);
 628         int report_id = buf[0];
 629         int ret;
 630
 631         if (report_type == HID_INPUT_REPORT)
 632                 return -EINVAL;
 633
 634         mutex_lock(&ihid->reset_lock);
 635
 636         if (report_id) {
 637                 buf++;
 638                 count--;
 639         }
 640
 641         ret = i2c_hid_set_or_send_report(client,
 642                                 report_type == HID_FEATURE_REPORT ? 0x03 : 0x02,
 643                                 report_id, buf, count, use_data);
 644
 645         if (report_id && ret >= 0)
 646                 ret++; /* add report_id to the number of transfered bytes */
 647
 648         mutex_unlock(&ihid->reset_lock);
 649
 650         return ret;
 651 }
 652
 653 static int i2c_hid_output_report(struct hid_device *hid, __u8 *buf,
 654                 size_t count)
 655 {
 656         return i2c_hid_output_raw_report(hid, buf, count, HID_OUTPUT_REPORT,
 657                         false);
 658 }
 659
 660 static int i2c_hid_raw_request(struct hid_device *hid, unsigned char reportnum,
 661                                __u8 *buf, size_t len, unsigned char rtype,
 662                                int reqtype)
 663 {
 664         switch (reqtype) {
 665         case HID_REQ_GET_REPORT:
 666                 return i2c_hid_get_raw_report(hid, reportnum, buf, len, rtype);
 667         case HID_REQ_SET_REPORT:
 668                 if (buf[0] != reportnum)
 669                         return -EINVAL;
 670                 return i2c_hid_output_raw_report(hid, buf, len, rtype, true);
 671         default:
 672                 return -EIO;
 673         }
 674 }
 675
 676 static int i2c_hid_parse(struct hid_device *hid)
 677 {
 678         struct i2c_client *client = hid->driver_data;
 679         struct i2c_hid *ihid = i2c_get_clientdata(client);
 680         struct i2c_hid_desc *hdesc = &ihid->hdesc;
 681         unsigned int rsize;
 682         char *rdesc;
 683         int ret;
 684         int tries = 3;
 685         char *use_override;
 686
 687         i2c_hid_dbg(ihid, "entering %s\n", __func__);
 688
 689         rsize = le16_to_cpu(hdesc->wReportDescLength);
 690         if (!rsize || rsize > HID_MAX_DESCRIPTOR_SIZE) {
 691                 dbg_hid("weird size of report descriptor (%u)\n", rsize);
 692                 return -EINVAL;
 693         }
 694
 695         do {
 696                 ret = i2c_hid_hwreset(client);
 697                 if (ret)
 698                         msleep(1000);
 699         } while (tries-- > 0 && ret);
 700
 701         if (ret)
 702                 return ret;
 703
 704         use_override = i2c_hid_get_dmi_hid_report_desc_override(client->name,
 705                                                                 &rsize);
 706
 707         if (use_override) {
 708                 rdesc = use_override;
 709                 i2c_hid_dbg(ihid, "Using a HID report descriptor override\n");
 710         } else {
 711                 rdesc = kzalloc(rsize, GFP_KERNEL);
 712
 713                 if (!rdesc) {
 714                         dbg_hid("couldn't allocate rdesc memory\n");
 715                         return -ENOMEM;
 716                 }
 717
 718                 i2c_hid_dbg(ihid, "asking HID report descriptor\n");
 719
 720                 ret = i2c_hid_command(client, &hid_report_descr_cmd,
 721                                       rdesc, rsize);
 722                 if (ret) {
 723                         hid_err(hid, "reading report descriptor failed\n");
 724                         kfree(rdesc);
 725                         return -EIO;
 726                 }
 727         }
 728
 729         i2c_hid_dbg(ihid, "Report Descriptor: %*ph\n", rsize, rdesc);
 730
 731         ret = hid_parse_report(hid, rdesc, rsize);
 732         if (!use_override)
 733                 kfree(rdesc);
 734
 735         if (ret) {
 736                 dbg_hid("parsing report descriptor failed\n");
 737                 return ret;
 738         }
 739
 740         return 0;
 741 }
 742
 743 static int i2c_hid_start(struct hid_device *hid)
 744 {
 745         struct i2c_client *client = hid->driver_data;
 746         struct i2c_hid *ihid = i2c_get_clientdata(client);
 747         int ret;
 748         unsigned int bufsize = HID_MIN_BUFFER_SIZE;
 749
 750         i2c_hid_find_max_report(hid, HID_INPUT_REPORT, &bufsize);
 751         i2c_hid_find_max_report(hid, HID_OUTPUT_REPORT, &bufsize);
 752         i2c_hid_find_max_report(hid, HID_FEATURE_REPORT, &bufsize);
 753
 754         if (bufsize > ihid->bufsize) {
 755                 disable_irq(client->irq);
 756                 i2c_hid_free_buffers(ihid);
 757
 758                 ret = i2c_hid_alloc_buffers(ihid, bufsize);
 759                 enable_irq(client->irq);
 760
 761                 if (ret)
 762                         return ret;
 763         }
 764
 765         return 0;
 766 }
 767
 768 static void i2c_hid_stop(struct hid_device *hid)
 769 {
 770         hid->claimed = 0;
 771 }
 772
 773 static int i2c_hid_open(struct hid_device *hid)
 774 {
 775         struct i2c_client *client = hid->driver_data;
 776         struct i2c_hid *ihid = i2c_get_clientdata(client);
 777
 778         set_bit(I2C_HID_STARTED, &ihid->flags);
 779         return 0;
 780 }
 781
 782 static void i2c_hid_close(struct hid_device *hid)
 783 {
 784         struct i2c_client *client = hid->driver_data;
 785         struct i2c_hid *ihid = i2c_get_clientdata(client);
 786
 787         clear_bit(I2C_HID_STARTED, &ihid->flags);
 788 }
 789
 790 struct hid_ll_driver i2c_hid_ll_driver = {
 791         .parse = i2c_hid_parse,
 792         .start = i2c_hid_start,
 793         .stop = i2c_hid_stop,
 794         .open = i2c_hid_open,
 795         .close = i2c_hid_close,
 796         .output_report = i2c_hid_output_report,
 797         .raw_request = i2c_hid_raw_request,
 798 };
 799 EXPORT_SYMBOL_GPL(i2c_hid_ll_driver);
 800
 801 static int i2c_hid_init_irq(struct i2c_client *client)
 802 {
 803         struct i2c_hid *ihid = i2c_get_clientdata(client);
 804         unsigned long irqflags = 0;
 805         int ret;
 806
 807         dev_dbg(&client->dev, "Requesting IRQ: %d\n", client->irq);
 808
 809         if (!irq_get_trigger_type(client->irq))
 810                 irqflags = IRQF_TRIGGER_LOW;
 811
 812         ret = request_threaded_irq(client->irq, NULL, i2c_hid_irq,
 813                                    irqflags | IRQF_ONESHOT, client->name, ihid);
 814         if (ret < 0) {
 815                 dev_warn(&client->dev,
 816                         "Could not register for %s interrupt, irq = %d,"
 817                         " ret = %d\n",
 818                         client->name, client->irq, ret);
 819
 820                 return ret;
 821         }
 822
 823         return 0;
 824 }
 825
 826 static int i2c_hid_fetch_hid_descriptor(struct i2c_hid *ihid)
 827 {
 828         struct i2c_client *client = ihid->client;
 829         struct i2c_hid_desc *hdesc = &ihid->hdesc;
 830         unsigned int dsize;
 831         int ret;
 832
 833         /* i2c hid fetch using a fixed descriptor size (30 bytes) */
 834         if (i2c_hid_get_dmi_i2c_hid_desc_override(client->name)) {
 835                 i2c_hid_dbg(ihid, "Using a HID descriptor override\n");
 836                 ihid->hdesc =
 837                         *i2c_hid_get_dmi_i2c_hid_desc_override(client->name);
 838         } else {
 839                 i2c_hid_dbg(ihid, "Fetching the HID descriptor\n");
 840                 ret = i2c_hid_command(client, &hid_descr_cmd,
 841                                       ihid->hdesc_buffer,
 842                                       sizeof(struct i2c_hid_desc));
 843                 if (ret) {
 844                         dev_err(&client->dev, "hid_descr_cmd failed\n");
 845                         return -ENODEV;
 846                 }
 847         }
 848
 849         /* Validate the length of HID descriptor, the 4 first bytes:
 850          * bytes 0-1 -> length
 851          * bytes 2-3 -> bcdVersion (has to be 1.00) */
 852         /* check bcdVersion == 1.0 */
 853         if (le16_to_cpu(hdesc->bcdVersion) != 0x0100) {
 854                 dev_err(&client->dev,
 855                         "unexpected HID descriptor bcdVersion (0x%04hx)\n",
 856                         le16_to_cpu(hdesc->bcdVersion));
 857                 return -ENODEV;
 858         }
 859
 860         /* Descriptor length should be 30 bytes as per the specification */
 861         dsize = le16_to_cpu(hdesc->wHIDDescLength);
 862         if (dsize != sizeof(struct i2c_hid_desc)) {
 863                 dev_err(&client->dev, "weird size of HID descriptor (%u)\n",
 864                         dsize);
 865                 return -ENODEV;
 866         }
 867         i2c_hid_dbg(ihid, "HID Descriptor: %*ph\n", dsize, ihid->hdesc_buffer);
 868         return 0;
 869 }
 870
 871 #ifdef CONFIG_ACPI
 872 static const struct acpi_device_id i2c_hid_acpi_blacklist[] = {
 873         /*
 874          * The CHPN0001 ACPI device, which is used to describe the Chipone
 875          * ICN8505 controller, has a _CID of PNP0C50 but is not HID compatible.
 876          */
 877         {"CHPN0001", 0 },
 878         { },
 879 };
 880
 881 static int i2c_hid_acpi_pdata(struct i2c_client *client,
 882                 struct i2c_hid_platform_data *pdata)
 883 {
 884         static guid_t i2c_hid_guid =
 885                 GUID_INIT(0x3CDFF6F7, 0x4267, 0x4555,
 886                           0xAD, 0x05, 0xB3, 0x0A, 0x3D, 0x89, 0x38, 0xDE);
 887         union acpi_object *obj;
 888         struct acpi_device *adev;
 889         acpi_handle handle;
 890
 891         handle = ACPI_HANDLE(&client->dev);
 892         if (!handle || acpi_bus_get_device(handle, &adev)) {
 893                 dev_err(&client->dev, "Error could not get ACPI device\n");
 894                 return -ENODEV;
 895         }
 896
 897         if (acpi_match_device_ids(adev, i2c_hid_acpi_blacklist) == 0)
 898                 return -ENODEV;
 899
 900         obj = acpi_evaluate_dsm_typed(handle, &i2c_hid_guid, 1, 1, NULL,
 901                                       ACPI_TYPE_INTEGER);
 902         if (!obj) {
 903                 dev_err(&client->dev, "Error _DSM call to get HID descriptor address failed\n");
 904                 return -ENODEV;
 905         }
 906
 907         pdata->hid_descriptor_address = obj->integer.value;
 908         ACPI_FREE(obj);
 909
 910         return 0;
 911 }
 912
 913 static void i2c_hid_acpi_fix_up_power(struct device *dev)
 914 {
 915         struct acpi_device *adev;
 916
 917         adev = ACPI_COMPANION(dev);
 918         if (adev)
 919                 acpi_device_fix_up_power(adev);
 920 }
 921
 922 static const struct acpi_device_id i2c_hid_acpi_match[] = {
 923         {"ACPI0C50", 0 },
 924         {"PNP0C50", 0 },
 925         { },
 926 };
 927 MODULE_DEVICE_TABLE(acpi, i2c_hid_acpi_match);
 928 #else
 929 static inline int i2c_hid_acpi_pdata(struct i2c_client *client,
 930                 struct i2c_hid_platform_data *pdata)
 931 {
 932         return -ENODEV;
 933 }
 934
 935 static inline void i2c_hid_acpi_fix_up_power(struct device *dev) {}
 936 #endif
 937
 938 #ifdef CONFIG_OF
 939 static int i2c_hid_of_probe(struct i2c_client *client,
 940                 struct i2c_hid_platform_data *pdata)
 941 {
 942         struct device *dev = &client->dev;
 943         u32 val;
 944         int ret;
 945
 946         ret = of_property_read_u32(dev->of_node, "hid-descr-addr", &val);
 947         if (ret) {
 948                 dev_err(&client->dev, "HID register address not provided\n");
 949                 return -ENODEV;
 950         }
 951         if (val >> 16) {
 952                 dev_err(&client->dev, "Bad HID register address: 0x%08x\n",
 953                         val);
 954                 return -EINVAL;
 955         }
 956         pdata->hid_descriptor_address = val;
 957
 958         return 0;
 959 }
 960
 961 static const struct of_device_id i2c_hid_of_match[] = {
 962         { .compatible = "hid-over-i2c" },
 963         {},
 964 };
 965 MODULE_DEVICE_TABLE(of, i2c_hid_of_match);
 966 #else
 967 static inline int i2c_hid_of_probe(struct i2c_client *client,
 968                 struct i2c_hid_platform_data *pdata)
 969 {
 970         return -ENODEV;
 971 }
 972 #endif
 973
 974 static void i2c_hid_fwnode_probe(struct i2c_client *client,
 975                                  struct i2c_hid_platform_data *pdata)
 976 {
 977         u32 val;
 978
 979         if (!device_property_read_u32(&client->dev, "post-power-on-delay-ms",
 980                                       &val))
 981                 pdata->post_power_delay_ms = val;
 982 }
 983
 984 static int i2c_hid_probe(struct i2c_client *client,
 985                          const struct i2c_device_id *dev_id)
 986 {
 987         int ret;
 988         struct i2c_hid *ihid;
 989         struct hid_device *hid;
 990         __u16 hidRegister;
 991         struct i2c_hid_platform_data *platform_data = client->dev.platform_data;
 992
 993         dbg_hid("HID probe called for i2c 0x%02x\n", client->addr);
 994
 995         if (!client->irq) {
 996                 dev_err(&client->dev,
 997                         "HID over i2c has not been provided an Int IRQ\n");
 998                 return -EINVAL;
 999         }
1000
1001         if (client->irq < 0) {
1002                 if (client->irq != -EPROBE_DEFER)
1003                         dev_err(&client->dev,
1004                                 "HID over i2c doesn't have a valid IRQ\n");
1005                 return client->irq;
1006         }
1007
1008         ihid = devm_kzalloc(&client->dev, sizeof(*ihid), GFP_KERNEL);
1009         if (!ihid)
1010                 return -ENOMEM;
1011
1012         if (client->dev.of_node) {
1013                 ret = i2c_hid_of_probe(client, &ihid->pdata);
1014                 if (ret)
1015                         return ret;
1016         } else if (!platform_data) {
1017                 ret = i2c_hid_acpi_pdata(client, &ihid->pdata);
1018                 if (ret)
1019                         return ret;
1020         } else {
1021                 ihid->pdata = *platform_data;
1022         }
1023
1024         /* Parse platform agnostic common properties from ACPI / device tree */
1025         i2c_hid_fwnode_probe(client, &ihid->pdata);
1026
1027         ihid->pdata.supplies[0].supply = "vdd";
1028         ihid->pdata.supplies[1].supply = "vddl";
1029
1030         ret = devm_regulator_bulk_get(&client->dev,
1031                                       ARRAY_SIZE(ihid->pdata.supplies),
1032                                       ihid->pdata.supplies);
1033         if (ret)
1034                 return ret;
1035
1036         ret = regulator_bulk_enable(ARRAY_SIZE(ihid->pdata.supplies),
1037                                     ihid->pdata.supplies);
1038         if (ret < 0)
1039                 return ret;
1040
1041         if (ihid->pdata.post_power_delay_ms)
1042                 msleep(ihid->pdata.post_power_delay_ms);
1043
1044         i2c_set_clientdata(client, ihid);
1045
1046         ihid->client = client;
1047
1048         hidRegister = ihid->pdata.hid_descriptor_address;
1049         ihid->wHIDDescRegister = cpu_to_le16(hidRegister);
1050
1051         init_waitqueue_head(&ihid->wait);
1052         mutex_init(&ihid->reset_lock);
1053
1054         /* we need to allocate the command buffer without knowing the maximum
1055          * size of the reports. Let's use HID_MIN_BUFFER_SIZE, then we do the
1056          * real computation later. */
1057         ret = i2c_hid_alloc_buffers(ihid, HID_MIN_BUFFER_SIZE);
1058         if (ret < 0)
1059                 goto err_regulator;
1060
1061         i2c_hid_acpi_fix_up_power(&client->dev);
1062
1063         device_enable_async_suspend(&client->dev);
1064
1065         /* Make sure there is something at this address */
1066         ret = i2c_smbus_read_byte(client);
1067         if (ret < 0) {
1068                 dev_dbg(&client->dev, "nothing at this address: %d\n", ret);
1069                 ret = -ENXIO;
1070                 goto err_regulator;
1071         }
1072
1073         ret = i2c_hid_fetch_hid_descriptor(ihid);
1074         if (ret < 0)
1075                 goto err_regulator;
1076
1077         ret = i2c_hid_init_irq(client);
1078         if (ret < 0)
1079                 goto err_regulator;
1080
1081         hid = hid_allocate_device();
1082         if (IS_ERR(hid)) {
1083                 ret = PTR_ERR(hid);
1084                 goto err_irq;
1085         }
1086
1087         ihid->hid = hid;
1088
1089         hid->driver_data = client;
1090         hid->ll_driver = &i2c_hid_ll_driver;
1091         hid->dev.parent = &client->dev;
1092         hid->bus = BUS_I2C;
1093         hid->version = le16_to_cpu(ihid->hdesc.bcdVersion);
1094         hid->vendor = le16_to_cpu(ihid->hdesc.wVendorID);
1095         hid->product = le16_to_cpu(ihid->hdesc.wProductID);
1096
1097         snprintf(hid->name, sizeof(hid->name), "%s %04hX:%04hX",
1098                  client->name, hid->vendor, hid->product);
1099         strlcpy(hid->phys, dev_name(&client->dev), sizeof(hid->phys));
1100
1101         ihid->quirks = i2c_hid_lookup_quirk(hid->vendor, hid->product);
1102
1103         ret = hid_add_device(hid);
1104         if (ret) {
1105                 if (ret != -ENODEV)
1106                         hid_err(client, "can't add hid device: %d\n", ret);
1107                 goto err_mem_free;
1108         }
1109
1110         return 0;
1111
1112 err_mem_free:
1113         hid_destroy_device(hid);
1114
1115 err_irq:
1116         free_irq(client->irq, ihid);
1117
1118 err_regulator:
1119         regulator_bulk_disable(ARRAY_SIZE(ihid->pdata.supplies),
1120                                ihid->pdata.supplies);
1121         i2c_hid_free_buffers(ihid);
1122         return ret;
1123 }
1124
1125 static int i2c_hid_remove(struct i2c_client *client)
1126 {
1127         struct i2c_hid *ihid = i2c_get_clientdata(client);
1128         struct hid_device *hid;
1129
1130         hid = ihid->hid;
1131         hid_destroy_device(hid);
1132
1133         free_irq(client->irq, ihid);
1134
1135         if (ihid->bufsize)
1136                 i2c_hid_free_buffers(ihid);
1137
1138         regulator_bulk_disable(ARRAY_SIZE(ihid->pdata.supplies),
1139                                ihid->pdata.supplies);
1140
1141         return 0;
1142 }
1143
1144 static void i2c_hid_shutdown(struct i2c_client *client)
1145 {
1146         struct i2c_hid *ihid = i2c_get_clientdata(client);
1147
1148         i2c_hid_set_power(client, I2C_HID_PWR_SLEEP);
1149         free_irq(client->irq, ihid);
1150 }
1151
1152 #ifdef CONFIG_PM_SLEEP
1153 static int i2c_hid_suspend(struct device *dev)
1154 {
1155         struct i2c_client *client = to_i2c_client(dev);
1156         struct i2c_hid *ihid = i2c_get_clientdata(client);
1157         struct hid_device *hid = ihid->hid;
1158         int ret;
1159         int wake_status;
1160
1161         if (hid->driver && hid->driver->suspend) {
1162                 ret = hid->driver->suspend(hid, PMSG_SUSPEND);
1163                 if (ret < 0)
1164                         return ret;
1165         }
1166
1167         /* Save some power */
1168         i2c_hid_set_power(client, I2C_HID_PWR_SLEEP);
1169
1170         disable_irq(client->irq);
1171
1172         if (device_may_wakeup(&client->dev)) {
1173                 wake_status = enable_irq_wake(client->irq);
1174                 if (!wake_status)
1175                         ihid->irq_wake_enabled = true;
1176                 else
1177                         hid_warn(hid, "Failed to enable irq wake: %d\n",
1178                                 wake_status);
1179         } else {
1180                 regulator_bulk_disable(ARRAY_SIZE(ihid->pdata.supplies),
1181                                        ihid->pdata.supplies);
1182         }
1183
1184         return 0;
1185 }
1186
1187 static int i2c_hid_resume(struct device *dev)
1188 {
1189         int ret;
1190         struct i2c_client *client = to_i2c_client(dev);
1191         struct i2c_hid *ihid = i2c_get_clientdata(client);
1192         struct hid_device *hid = ihid->hid;
1193         int wake_status;
1194
1195         if (!device_may_wakeup(&client->dev)) {
1196                 ret = regulator_bulk_enable(ARRAY_SIZE(ihid->pdata.supplies),
1197                                             ihid->pdata.supplies);
1198                 if (ret)
1199                         hid_warn(hid, "Failed to enable supplies: %d\n", ret);
1200
1201                 if (ihid->pdata.post_power_delay_ms)
1202                         msleep(ihid->pdata.post_power_delay_ms);
1203         } else if (ihid->irq_wake_enabled) {
1204                 wake_status = disable_irq_wake(client->irq);
1205                 if (!wake_status)
1206                         ihid->irq_wake_enabled = false;
1207                 else
1208                         hid_warn(hid, "Failed to disable irq wake: %d\n",
1209                                 wake_status);
1210         }
1211
1212         enable_irq(client->irq);
1213
1214         /* Instead of resetting device, simply powers the device on. This
1215          * solves "incomplete reports" on Raydium devices 2386:3118 and
1216          * 2386:4B33 and fixes various SIS touchscreens no longer sending
1217          * data after a suspend/resume.
1218          *
1219          * However some ALPS touchpads generate IRQ storm without reset, so
1220          * let's still reset them here.
1221          */
1222         if (ihid->quirks & I2C_HID_QUIRK_RESET_ON_RESUME)
1223                 ret = i2c_hid_hwreset(client);
1224         else
1225                 ret = i2c_hid_set_power(client, I2C_HID_PWR_ON);
1226
1227         if (ret)
1228                 return ret;
1229
1230         if (hid->driver && hid->driver->reset_resume) {
1231                 ret = hid->driver->reset_resume(hid);
1232                 return ret;
1233         }
1234
1235         return 0;
1236 }
1237 #endif
1238
1239 static const struct dev_pm_ops i2c_hid_pm = {
1240         SET_SYSTEM_SLEEP_PM_OPS(i2c_hid_suspend, i2c_hid_resume)
1241 };
1242
1243 static const struct i2c_device_id i2c_hid_id_table[] = {
1244         { "hid", 0 },
1245         { "hid-over-i2c", 0 },
1246         { },
1247 };
1248 MODULE_DEVICE_TABLE(i2c, i2c_hid_id_table);
1249
1250
1251 static struct i2c_driver i2c_hid_driver = {
1252         .driver = {
1253                 .name   = "i2c_hid",
1254                 .pm     = &i2c_hid_pm,
1255                 .acpi_match_table = ACPI_PTR(i2c_hid_acpi_match),
1256                 .of_match_table = of_match_ptr(i2c_hid_of_match),
1257         },
1258
1259         .probe          = i2c_hid_probe,
1260         .remove         = i2c_hid_remove,
1261         .shutdown       = i2c_hid_shutdown,
1262         .id_table       = i2c_hid_id_table,
1263 };
1264
1265 module_i2c_driver(i2c_hid_driver);
1266
1267 MODULE_DESCRIPTION("HID over I2C core driver");
1268 MODULE_AUTHOR("Benjamin Tissoires <benjamin.tissoires@gmail.com>");
1269 MODULE_LICENSE("GPL");