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

   1 /*
   2  * HID over I2C protocol implementation
   3  *
   4  * Copyright (c) 2012 Benjamin Tissoires <benjamin.tissoires@gmail.com>
   5  * Copyright (c) 2012 Ecole Nationale de l'Aviation Civile, France
   6  * Copyright (c) 2012 Red Hat, Inc
   7  *
   8  * This code is partly based on "USB HID support for Linux":
   9  *
  10  *  Copyright (c) 1999 Andreas Gal
  11  *  Copyright (c) 2000-2005 Vojtech Pavlik <vojtech@suse.cz>
  12  *  Copyright (c) 2005 Michael Haboustak <mike-@cinci.rr.com> for Concept2, Inc
  13  *  Copyright (c) 2007-2008 Oliver Neukum
  14  *  Copyright (c) 2006-2010 Jiri Kosina
  15  *
  16  * This file is subject to the terms and conditions of the GNU General Public
  17  * License.  See the file COPYING in the main directory of this archive for
  18  * more details.
  19  */
  20
  21 #include <linux/module.h>
  22 #include <linux/i2c.h>
  23 #include <linux/interrupt.h>
  24 #include <linux/input.h>
  25 #include <linux/irq.h>
  26 #include <linux/delay.h>
  27 #include <linux/slab.h>
  28 #include <linux/pm.h>
  29 #include <linux/pm_runtime.h>
  30 #include <linux/device.h>
  31 #include <linux/wait.h>
  32 #include <linux/err.h>
  33 #include <linux/string.h>
  34 #include <linux/list.h>
  35 #include <linux/jiffies.h>
  36 #include <linux/kernel.h>
  37 #include <linux/hid.h>
  38 #include <linux/mutex.h>
  39 #include <linux/acpi.h>
  40 #include <linux/of.h>
  41 #include <linux/regulator/consumer.h>
  42
  43 #include <linux/platform_data/i2c-hid.h>
  44
  45 #include "../hid-ids.h"
  46 #include "i2c-hid.h"
  47
  48 /* quirks to control the device */
  49 #define I2C_HID_QUIRK_SET_PWR_WAKEUP_DEV        BIT(0)
  50 #define I2C_HID_QUIRK_NO_IRQ_AFTER_RESET        BIT(1)
  51 #define I2C_HID_QUIRK_NO_RUNTIME_PM             BIT(2)
  52 #define I2C_HID_QUIRK_DELAY_AFTER_SLEEP         BIT(3)
  53
  54 /* flags */
  55 #define I2C_HID_STARTED         0
  56 #define I2C_HID_RESET_PENDING   1
  57 #define I2C_HID_READ_PENDING    2
  58
  59 #define I2C_HID_PWR_ON          0x00
  60 #define I2C_HID_PWR_SLEEP       0x01
  61
  62 /* debug option */
  63 static bool debug;
  64 module_param(debug, bool, 0444);
  65 MODULE_PARM_DESC(debug, "print a lot of debug information");
  66
  67 #define i2c_hid_dbg(ihid, fmt, arg...)                                    \
  68 do {                                                                      \
  69         if (debug)                                                        \
  70                 dev_printk(KERN_DEBUG, &(ihid)->client->dev, fmt, ##arg); \
  71 } while (0)
  72
  73 struct i2c_hid_desc {
  74         __le16 wHIDDescLength;
  75         __le16 bcdVersion;
  76         __le16 wReportDescLength;
  77         __le16 wReportDescRegister;
  78         __le16 wInputRegister;
  79         __le16 wMaxInputLength;
  80         __le16 wOutputRegister;
  81         __le16 wMaxOutputLength;
  82         __le16 wCommandRegister;
  83         __le16 wDataRegister;
  84         __le16 wVendorID;
  85         __le16 wProductID;
  86         __le16 wVersionID;
  87         __le32 reserved;
  88 } __packed;
  89
  90 struct i2c_hid_cmd {
  91         unsigned int registerIndex;
  92         __u8 opcode;
  93         unsigned int length;
  94         bool wait;
  95 };
  96
  97 union command {
  98         u8 data[0];
  99         struct cmd {
 100                 __le16 reg;
 101                 __u8 reportTypeID;
 102                 __u8 opcode;
 103         } __packed c;
 104 };
 105
 106 #define I2C_HID_CMD(opcode_) \
 107         .opcode = opcode_, .length = 4, \
 108         .registerIndex = offsetof(struct i2c_hid_desc, wCommandRegister)
 109
 110 /* fetch HID descriptor */
 111 static const struct i2c_hid_cmd hid_descr_cmd = { .length = 2 };
 112 /* fetch report descriptors */
 113 static const struct i2c_hid_cmd hid_report_descr_cmd = {
 114                 .registerIndex = offsetof(struct i2c_hid_desc,
 115                         wReportDescRegister),
 116                 .opcode = 0x00,
 117                 .length = 2 };
 118 /* commands */
 119 static const struct i2c_hid_cmd hid_reset_cmd =         { I2C_HID_CMD(0x01),
 120                                                           .wait = true };
 121 static const struct i2c_hid_cmd hid_get_report_cmd =    { I2C_HID_CMD(0x02) };
 122 static const struct i2c_hid_cmd hid_set_report_cmd =    { I2C_HID_CMD(0x03) };
 123 static const struct i2c_hid_cmd hid_set_power_cmd =     { I2C_HID_CMD(0x08) };
 124 static const struct i2c_hid_cmd hid_no_cmd =            { .length = 0 };
 125
 126 /*
 127  * These definitions are not used here, but are defined by the spec.
 128  * Keeping them here for documentation purposes.
 129  *
 130  * static const struct i2c_hid_cmd hid_get_idle_cmd = { I2C_HID_CMD(0x04) };
 131  * static const struct i2c_hid_cmd hid_set_idle_cmd = { I2C_HID_CMD(0x05) };
 132  * static const struct i2c_hid_cmd hid_get_protocol_cmd = { I2C_HID_CMD(0x06) };
 133  * static const struct i2c_hid_cmd hid_set_protocol_cmd = { I2C_HID_CMD(0x07) };
 134  */
 135
 136 /* The main device structure */
 137 struct i2c_hid {
 138         struct i2c_client       *client;        /* i2c client */
 139         struct hid_device       *hid;   /* pointer to corresponding HID dev */
 140         union {
 141                 __u8 hdesc_buffer[sizeof(struct i2c_hid_desc)];
 142                 struct i2c_hid_desc hdesc;      /* the HID Descriptor */
 143         };
 144         __le16                  wHIDDescRegister; /* location of the i2c
 145                                                    * register of the HID
 146                                                    * descriptor. */
 147         unsigned int            bufsize;        /* i2c buffer size */
 148         u8                      *inbuf;         /* Input buffer */
 149         u8                      *rawbuf;        /* Raw Input buffer */
 150         u8                      *cmdbuf;        /* Command buffer */
 151         u8                      *argsbuf;       /* Command arguments buffer */
 152
 153         unsigned long           flags;          /* device flags */
 154         unsigned long           quirks;         /* Various quirks */
 155
 156         wait_queue_head_t       wait;           /* For waiting the interrupt */
 157
 158         struct i2c_hid_platform_data pdata;
 159
 160         bool                    irq_wake_enabled;
 161         struct mutex            reset_lock;
 162
 163         unsigned long           sleep_delay;
 164 };
 165
 166 static const struct i2c_hid_quirks {
 167         __u16 idVendor;
 168         __u16 idProduct;
 169         __u32 quirks;
 170 } i2c_hid_quirks[] = {
 171         { USB_VENDOR_ID_WEIDA, USB_DEVICE_ID_WEIDA_8752,
 172                 I2C_HID_QUIRK_SET_PWR_WAKEUP_DEV },
 173         { USB_VENDOR_ID_WEIDA, USB_DEVICE_ID_WEIDA_8755,
 174                 I2C_HID_QUIRK_SET_PWR_WAKEUP_DEV },
 175         { I2C_VENDOR_ID_HANTICK, I2C_PRODUCT_ID_HANTICK_5288,
 176                 I2C_HID_QUIRK_NO_IRQ_AFTER_RESET |
 177                 I2C_HID_QUIRK_NO_RUNTIME_PM },
 178         { I2C_VENDOR_ID_RAYDIUM, I2C_PRODUCT_ID_RAYDIUM_4B33,
 179                 I2C_HID_QUIRK_DELAY_AFTER_SLEEP },
 180         { USB_VENDOR_ID_LG, I2C_DEVICE_ID_LG_8001,
 181                 I2C_HID_QUIRK_NO_RUNTIME_PM },
 182         { 0, 0 }
 183 };
 184
 185 /*
 186  * i2c_hid_lookup_quirk: return any quirks associated with a I2C HID device
 187  * @idVendor: the 16-bit vendor ID
 188  * @idProduct: the 16-bit product ID
 189  *
 190  * Returns: a u32 quirks value.
 191  */
 192 static u32 i2c_hid_lookup_quirk(const u16 idVendor, const u16 idProduct)
 193 {
 194         u32 quirks = 0;
 195         int n;
 196
 197         for (n = 0; i2c_hid_quirks[n].idVendor; n++)
 198                 if (i2c_hid_quirks[n].idVendor == idVendor &&
 199                     (i2c_hid_quirks[n].idProduct == (__u16)HID_ANY_ID ||
 200                      i2c_hid_quirks[n].idProduct == idProduct))
 201                         quirks = i2c_hid_quirks[n].quirks;
 202
 203         return quirks;
 204 }
 205
 206 static int __i2c_hid_command(struct i2c_client *client,
 207                 const struct i2c_hid_cmd *command, u8 reportID,
 208                 u8 reportType, u8 *args, int args_len,
 209                 unsigned char *buf_recv, int data_len)
 210 {
 211         struct i2c_hid *ihid = i2c_get_clientdata(client);
 212         union command *cmd = (union command *)ihid->cmdbuf;
 213         int ret;
 214         struct i2c_msg msg[2];
 215         int msg_num = 1;
 216
 217         int length = command->length;
 218         bool wait = command->wait;
 219         unsigned int registerIndex = command->registerIndex;
 220
 221         /* special case for hid_descr_cmd */
 222         if (command == &hid_descr_cmd) {
 223                 cmd->c.reg = ihid->wHIDDescRegister;
 224         } else {
 225                 cmd->data[0] = ihid->hdesc_buffer[registerIndex];
 226                 cmd->data[1] = ihid->hdesc_buffer[registerIndex + 1];
 227         }
 228
 229         if (length > 2) {
 230                 cmd->c.opcode = command->opcode;
 231                 cmd->c.reportTypeID = reportID | reportType << 4;
 232         }
 233
 234         memcpy(cmd->data + length, args, args_len);
 235         length += args_len;
 236
 237         i2c_hid_dbg(ihid, "%s: cmd=%*ph\n", __func__, length, cmd->data);
 238
 239         msg[0].addr = client->addr;
 240         msg[0].flags = client->flags & I2C_M_TEN;
 241         msg[0].len = length;
 242         msg[0].buf = cmd->data;
 243         if (data_len > 0) {
 244                 msg[1].addr = client->addr;
 245                 msg[1].flags = client->flags & I2C_M_TEN;
 246                 msg[1].flags |= I2C_M_RD;
 247                 msg[1].len = data_len;
 248                 msg[1].buf = buf_recv;
 249                 msg_num = 2;
 250                 set_bit(I2C_HID_READ_PENDING, &ihid->flags);
 251         }
 252
 253         if (wait)
 254                 set_bit(I2C_HID_RESET_PENDING, &ihid->flags);
 255
 256         ret = i2c_transfer(client->adapter, msg, msg_num);
 257
 258         if (data_len > 0)
 259                 clear_bit(I2C_HID_READ_PENDING, &ihid->flags);
 260
 261         if (ret != msg_num)
 262                 return ret < 0 ? ret : -EIO;
 263
 264         ret = 0;
 265
 266         if (wait && (ihid->quirks & I2C_HID_QUIRK_NO_IRQ_AFTER_RESET)) {
 267                 msleep(100);
 268         } else if (wait) {
 269                 i2c_hid_dbg(ihid, "%s: waiting...\n", __func__);
 270                 if (!wait_event_timeout(ihid->wait,
 271                                 !test_bit(I2C_HID_RESET_PENDING, &ihid->flags),
 272                                 msecs_to_jiffies(5000)))
 273                         ret = -ENODATA;
 274                 i2c_hid_dbg(ihid, "%s: finished.\n", __func__);
 275         }
 276
 277         return ret;
 278 }
 279
 280 static int i2c_hid_command(struct i2c_client *client,
 281                 const struct i2c_hid_cmd *command,
 282                 unsigned char *buf_recv, int data_len)
 283 {
 284         return __i2c_hid_command(client, command, 0, 0, NULL, 0,
 285                                 buf_recv, data_len);
 286 }
 287
 288 static int i2c_hid_get_report(struct i2c_client *client, u8 reportType,
 289                 u8 reportID, unsigned char *buf_recv, int data_len)
 290 {
 291         struct i2c_hid *ihid = i2c_get_clientdata(client);
 292         u8 args[3];
 293         int ret;
 294         int args_len = 0;
 295         u16 readRegister = le16_to_cpu(ihid->hdesc.wDataRegister);
 296
 297         i2c_hid_dbg(ihid, "%s\n", __func__);
 298
 299         if (reportID >= 0x0F) {
 300                 args[args_len++] = reportID;
 301                 reportID = 0x0F;
 302         }
 303
 304         args[args_len++] = readRegister & 0xFF;
 305         args[args_len++] = readRegister >> 8;
 306
 307         ret = __i2c_hid_command(client, &hid_get_report_cmd, reportID,
 308                 reportType, args, args_len, buf_recv, data_len);
 309         if (ret) {
 310                 dev_err(&client->dev,
 311                         "failed to retrieve report from device.\n");
 312                 return ret;
 313         }
 314
 315         return 0;
 316 }
 317
 318 /**
 319  * i2c_hid_set_or_send_report: forward an incoming report to the device
 320  * @client: the i2c_client of the device
 321  * @reportType: 0x03 for HID_FEATURE_REPORT ; 0x02 for HID_OUTPUT_REPORT
 322  * @reportID: the report ID
 323  * @buf: the actual data to transfer, without the report ID
 324  * @len: size of buf
 325  * @use_data: true: use SET_REPORT HID command, false: send plain OUTPUT report
 326  */
 327 static int i2c_hid_set_or_send_report(struct i2c_client *client, u8 reportType,
 328                 u8 reportID, unsigned char *buf, size_t data_len, bool use_data)
 329 {
 330         struct i2c_hid *ihid = i2c_get_clientdata(client);
 331         u8 *args = ihid->argsbuf;
 332         const struct i2c_hid_cmd *hidcmd;
 333         int ret;
 334         u16 dataRegister = le16_to_cpu(ihid->hdesc.wDataRegister);
 335         u16 outputRegister = le16_to_cpu(ihid->hdesc.wOutputRegister);
 336         u16 maxOutputLength = le16_to_cpu(ihid->hdesc.wMaxOutputLength);
 337         u16 size;
 338         int args_len;
 339         int index = 0;
 340
 341         i2c_hid_dbg(ihid, "%s\n", __func__);
 342
 343         if (data_len > ihid->bufsize)
 344                 return -EINVAL;
 345
 346         size =          2                       /* size */ +
 347                         (reportID ? 1 : 0)      /* reportID */ +
 348                         data_len                /* buf */;
 349         args_len =      (reportID >= 0x0F ? 1 : 0) /* optional third byte */ +
 350                         2                       /* dataRegister */ +
 351                         size                    /* args */;
 352
 353         if (!use_data && maxOutputLength == 0)
 354                 return -ENOSYS;
 355
 356         if (reportID >= 0x0F) {
 357                 args[index++] = reportID;
 358                 reportID = 0x0F;
 359         }
 360
 361         /*
 362          * use the data register for feature reports or if the device does not
 363          * support the output register
 364          */
 365         if (use_data) {
 366                 args[index++] = dataRegister & 0xFF;
 367                 args[index++] = dataRegister >> 8;
 368                 hidcmd = &hid_set_report_cmd;
 369         } else {
 370                 args[index++] = outputRegister & 0xFF;
 371                 args[index++] = outputRegister >> 8;
 372                 hidcmd = &hid_no_cmd;
 373         }
 374
 375         args[index++] = size & 0xFF;
 376         args[index++] = size >> 8;
 377
 378         if (reportID)
 379                 args[index++] = reportID;
 380
 381         memcpy(&args[index], buf, data_len);
 382
 383         ret = __i2c_hid_command(client, hidcmd, reportID,
 384                 reportType, args, args_len, NULL, 0);
 385         if (ret) {
 386                 dev_err(&client->dev, "failed to set a report to device.\n");
 387                 return ret;
 388         }
 389
 390         return data_len;
 391 }
 392
 393 static int i2c_hid_set_power(struct i2c_client *client, int power_state)
 394 {
 395         struct i2c_hid *ihid = i2c_get_clientdata(client);
 396         int ret;
 397         unsigned long now, delay;
 398
 399         i2c_hid_dbg(ihid, "%s\n", __func__);
 400
 401         /*
 402          * Some devices require to send a command to wakeup before power on.
 403          * The call will get a return value (EREMOTEIO) but device will be
 404          * triggered and activated. After that, it goes like a normal device.
 405          */
 406         if (power_state == I2C_HID_PWR_ON &&
 407             ihid->quirks & I2C_HID_QUIRK_SET_PWR_WAKEUP_DEV) {
 408                 ret = i2c_hid_command(client, &hid_set_power_cmd, NULL, 0);
 409
 410                 /* Device was already activated */
 411                 if (!ret)
 412                         goto set_pwr_exit;
 413         }
 414
 415         if (ihid->quirks & I2C_HID_QUIRK_DELAY_AFTER_SLEEP &&
 416             power_state == I2C_HID_PWR_ON) {
 417                 now = jiffies;
 418                 if (time_after(ihid->sleep_delay, now)) {
 419                         delay = jiffies_to_usecs(ihid->sleep_delay - now);
 420                         usleep_range(delay, delay + 1);
 421                 }
 422         }
 423
 424         ret = __i2c_hid_command(client, &hid_set_power_cmd, power_state,
 425                 0, NULL, 0, NULL, 0);
 426
 427         if (ihid->quirks & I2C_HID_QUIRK_DELAY_AFTER_SLEEP &&
 428             power_state == I2C_HID_PWR_SLEEP)
 429                 ihid->sleep_delay = jiffies + msecs_to_jiffies(20);
 430
 431         if (ret)
 432                 dev_err(&client->dev, "failed to change power setting.\n");
 433
 434 set_pwr_exit:
 435         return ret;
 436 }
 437
 438 static int i2c_hid_hwreset(struct i2c_client *client)
 439 {
 440         struct i2c_hid *ihid = i2c_get_clientdata(client);
 441         int ret;
 442
 443         i2c_hid_dbg(ihid, "%s\n", __func__);
 444
 445         /*
 446          * This prevents sending feature reports while the device is
 447          * being reset. Otherwise we may lose the reset complete
 448          * interrupt.
 449          */
 450         mutex_lock(&ihid->reset_lock);
 451
 452         ret = i2c_hid_set_power(client, I2C_HID_PWR_ON);
 453         if (ret)
 454                 goto out_unlock;
 455
 456         /*
 457          * The HID over I2C specification states that if a DEVICE needs time
 458          * after the PWR_ON request, it should utilise CLOCK stretching.
 459          * However, it has been observered that the Windows driver provides a
 460          * 1ms sleep between the PWR_ON and RESET requests and that some devices
 461          * rely on this.
 462          */
 463         usleep_range(1000, 5000);
 464
 465         i2c_hid_dbg(ihid, "resetting...\n");
 466
 467         ret = i2c_hid_command(client, &hid_reset_cmd, NULL, 0);
 468         if (ret) {
 469                 dev_err(&client->dev, "failed to reset device.\n");
 470                 i2c_hid_set_power(client, I2C_HID_PWR_SLEEP);
 471         }
 472
 473 out_unlock:
 474         mutex_unlock(&ihid->reset_lock);
 475         return ret;
 476 }
 477
 478 static void i2c_hid_get_input(struct i2c_hid *ihid)
 479 {
 480         int ret;
 481         u32 ret_size;
 482         int size = le16_to_cpu(ihid->hdesc.wMaxInputLength);
 483
 484         if (size > ihid->bufsize)
 485                 size = ihid->bufsize;
 486
 487         ret = i2c_master_recv(ihid->client, ihid->inbuf, size);
 488         if (ret != size) {
 489                 if (ret < 0)
 490                         return;
 491
 492                 dev_err(&ihid->client->dev, "%s: got %d data instead of %d\n",
 493                         __func__, ret, size);
 494                 return;
 495         }
 496
 497         ret_size = ihid->inbuf[0] | ihid->inbuf[1] << 8;
 498
 499         if (!ret_size) {
 500                 /* host or device initiated RESET completed */
 501                 if (test_and_clear_bit(I2C_HID_RESET_PENDING, &ihid->flags))
 502                         wake_up(&ihid->wait);
 503                 return;
 504         }
 505
 506         if ((ret_size > size) || (ret_size < 2)) {
 507                 dev_err(&ihid->client->dev, "%s: incomplete report (%d/%d)\n",
 508                         __func__, size, ret_size);
 509                 return;
 510         }
 511
 512         i2c_hid_dbg(ihid, "input: %*ph\n", ret_size, ihid->inbuf);
 513
 514         if (test_bit(I2C_HID_STARTED, &ihid->flags))
 515                 hid_input_report(ihid->hid, HID_INPUT_REPORT, ihid->inbuf + 2,
 516                                 ret_size - 2, 1);
 517
 518         return;
 519 }
 520
 521 static irqreturn_t i2c_hid_irq(int irq, void *dev_id)
 522 {
 523         struct i2c_hid *ihid = dev_id;
 524
 525         if (test_bit(I2C_HID_READ_PENDING, &ihid->flags))
 526                 return IRQ_HANDLED;
 527
 528         i2c_hid_get_input(ihid);
 529
 530         return IRQ_HANDLED;
 531 }
 532
 533 static int i2c_hid_get_report_length(struct hid_report *report)
 534 {
 535         return ((report->size - 1) >> 3) + 1 +
 536                 report->device->report_enum[report->type].numbered + 2;
 537 }
 538
 539 /*
 540  * Traverse the supplied list of reports and find the longest
 541  */
 542 static void i2c_hid_find_max_report(struct hid_device *hid, unsigned int type,
 543                 unsigned int *max)
 544 {
 545         struct hid_report *report;
 546         unsigned int size;
 547
 548         /* We should not rely on wMaxInputLength, as some devices may set it to
 549          * a wrong length. */
 550         list_for_each_entry(report, &hid->report_enum[type].report_list, list) {
 551                 size = i2c_hid_get_report_length(report);
 552                 if (*max < size)
 553                         *max = size;
 554         }
 555 }
 556
 557 static void i2c_hid_free_buffers(struct i2c_hid *ihid)
 558 {
 559         kfree(ihid->inbuf);
 560         kfree(ihid->rawbuf);
 561         kfree(ihid->argsbuf);
 562         kfree(ihid->cmdbuf);
 563         ihid->inbuf = NULL;
 564         ihid->rawbuf = NULL;
 565         ihid->cmdbuf = NULL;
 566         ihid->argsbuf = NULL;
 567         ihid->bufsize = 0;
 568 }
 569
 570 static int i2c_hid_alloc_buffers(struct i2c_hid *ihid, size_t report_size)
 571 {
 572         /* the worst case is computed from the set_report command with a
 573          * reportID > 15 and the maximum report length */
 574         int args_len = sizeof(__u8) + /* ReportID */
 575                        sizeof(__u8) + /* optional ReportID byte */
 576                        sizeof(__u16) + /* data register */
 577                        sizeof(__u16) + /* size of the report */
 578                        report_size; /* report */
 579
 580         ihid->inbuf = kzalloc(report_size, GFP_KERNEL);
 581         ihid->rawbuf = kzalloc(report_size, GFP_KERNEL);
 582         ihid->argsbuf = kzalloc(args_len, GFP_KERNEL);
 583         ihid->cmdbuf = kzalloc(sizeof(union command) + args_len, GFP_KERNEL);
 584
 585         if (!ihid->inbuf || !ihid->rawbuf || !ihid->argsbuf || !ihid->cmdbuf) {
 586                 i2c_hid_free_buffers(ihid);
 587                 return -ENOMEM;
 588         }
 589
 590         ihid->bufsize = report_size;
 591
 592         return 0;
 593 }
 594
 595 static int i2c_hid_get_raw_report(struct hid_device *hid,
 596                 unsigned char report_number, __u8 *buf, size_t count,
 597                 unsigned char report_type)
 598 {
 599         struct i2c_client *client = hid->driver_data;
 600         struct i2c_hid *ihid = i2c_get_clientdata(client);
 601         size_t ret_count, ask_count;
 602         int ret;
 603
 604         if (report_type == HID_OUTPUT_REPORT)
 605                 return -EINVAL;
 606
 607         /* +2 bytes to include the size of the reply in the query buffer */
 608         ask_count = min(count + 2, (size_t)ihid->bufsize);
 609
 610         ret = i2c_hid_get_report(client,
 611                         report_type == HID_FEATURE_REPORT ? 0x03 : 0x01,
 612                         report_number, ihid->rawbuf, ask_count);
 613
 614         if (ret < 0)
 615                 return ret;
 616
 617         ret_count = ihid->rawbuf[0] | (ihid->rawbuf[1] << 8);
 618
 619         if (ret_count <= 2)
 620                 return 0;
 621
 622         ret_count = min(ret_count, ask_count);
 623
 624         /* The query buffer contains the size, dropping it in the reply */
 625         count = min(count, ret_count - 2);
 626         memcpy(buf, ihid->rawbuf + 2, count);
 627
 628         return count;
 629 }
 630
 631 static int i2c_hid_output_raw_report(struct hid_device *hid, __u8 *buf,
 632                 size_t count, unsigned char report_type, bool use_data)
 633 {
 634         struct i2c_client *client = hid->driver_data;
 635         struct i2c_hid *ihid = i2c_get_clientdata(client);
 636         int report_id = buf[0];
 637         int ret;
 638
 639         if (report_type == HID_INPUT_REPORT)
 640                 return -EINVAL;
 641
 642         mutex_lock(&ihid->reset_lock);
 643
 644         if (report_id) {
 645                 buf++;
 646                 count--;
 647         }
 648
 649         ret = i2c_hid_set_or_send_report(client,
 650                                 report_type == HID_FEATURE_REPORT ? 0x03 : 0x02,
 651                                 report_id, buf, count, use_data);
 652
 653         if (report_id && ret >= 0)
 654                 ret++; /* add report_id to the number of transfered bytes */
 655
 656         mutex_unlock(&ihid->reset_lock);
 657
 658         return ret;
 659 }
 660
 661 static int i2c_hid_output_report(struct hid_device *hid, __u8 *buf,
 662                 size_t count)
 663 {
 664         return i2c_hid_output_raw_report(hid, buf, count, HID_OUTPUT_REPORT,
 665                         false);
 666 }
 667
 668 static int i2c_hid_raw_request(struct hid_device *hid, unsigned char reportnum,
 669                                __u8 *buf, size_t len, unsigned char rtype,
 670                                int reqtype)
 671 {
 672         switch (reqtype) {
 673         case HID_REQ_GET_REPORT:
 674                 return i2c_hid_get_raw_report(hid, reportnum, buf, len, rtype);
 675         case HID_REQ_SET_REPORT:
 676                 if (buf[0] != reportnum)
 677                         return -EINVAL;
 678                 return i2c_hid_output_raw_report(hid, buf, len, rtype, true);
 679         default:
 680                 return -EIO;
 681         }
 682 }
 683
 684 static int i2c_hid_parse(struct hid_device *hid)
 685 {
 686         struct i2c_client *client = hid->driver_data;
 687         struct i2c_hid *ihid = i2c_get_clientdata(client);
 688         struct i2c_hid_desc *hdesc = &ihid->hdesc;
 689         unsigned int rsize;
 690         char *rdesc;
 691         int ret;
 692         int tries = 3;
 693         char *use_override;
 694
 695         i2c_hid_dbg(ihid, "entering %s\n", __func__);
 696
 697         rsize = le16_to_cpu(hdesc->wReportDescLength);
 698         if (!rsize || rsize > HID_MAX_DESCRIPTOR_SIZE) {
 699                 dbg_hid("weird size of report descriptor (%u)\n", rsize);
 700                 return -EINVAL;
 701         }
 702
 703         do {
 704                 ret = i2c_hid_hwreset(client);
 705                 if (ret)
 706                         msleep(1000);
 707         } while (tries-- > 0 && ret);
 708
 709         if (ret)
 710                 return ret;
 711
 712         use_override = i2c_hid_get_dmi_hid_report_desc_override(client->name,
 713                                                                 &rsize);
 714
 715         if (use_override) {
 716                 rdesc = use_override;
 717                 i2c_hid_dbg(ihid, "Using a HID report descriptor override\n");
 718         } else {
 719                 rdesc = kzalloc(rsize, GFP_KERNEL);
 720
 721                 if (!rdesc) {
 722                         dbg_hid("couldn't allocate rdesc memory\n");
 723                         return -ENOMEM;
 724                 }
 725
 726                 i2c_hid_dbg(ihid, "asking HID report descriptor\n");
 727
 728                 ret = i2c_hid_command(client, &hid_report_descr_cmd,
 729                                       rdesc, rsize);
 730                 if (ret) {
 731                         hid_err(hid, "reading report descriptor failed\n");
 732                         kfree(rdesc);
 733                         return -EIO;
 734                 }
 735         }
 736
 737         i2c_hid_dbg(ihid, "Report Descriptor: %*ph\n", rsize, rdesc);
 738
 739         ret = hid_parse_report(hid, rdesc, rsize);
 740         if (!use_override)
 741                 kfree(rdesc);
 742
 743         if (ret) {
 744                 dbg_hid("parsing report descriptor failed\n");
 745                 return ret;
 746         }
 747
 748         return 0;
 749 }
 750
 751 static int i2c_hid_start(struct hid_device *hid)
 752 {
 753         struct i2c_client *client = hid->driver_data;
 754         struct i2c_hid *ihid = i2c_get_clientdata(client);
 755         int ret;
 756         unsigned int bufsize = HID_MIN_BUFFER_SIZE;
 757
 758         i2c_hid_find_max_report(hid, HID_INPUT_REPORT, &bufsize);
 759         i2c_hid_find_max_report(hid, HID_OUTPUT_REPORT, &bufsize);
 760         i2c_hid_find_max_report(hid, HID_FEATURE_REPORT, &bufsize);
 761
 762         if (bufsize > ihid->bufsize) {
 763                 disable_irq(client->irq);
 764                 i2c_hid_free_buffers(ihid);
 765
 766                 ret = i2c_hid_alloc_buffers(ihid, bufsize);
 767                 enable_irq(client->irq);
 768
 769                 if (ret)
 770                         return ret;
 771         }
 772
 773         return 0;
 774 }
 775
 776 static void i2c_hid_stop(struct hid_device *hid)
 777 {
 778         hid->claimed = 0;
 779 }
 780
 781 static int i2c_hid_open(struct hid_device *hid)
 782 {
 783         struct i2c_client *client = hid->driver_data;
 784         struct i2c_hid *ihid = i2c_get_clientdata(client);
 785         int ret = 0;
 786
 787         ret = pm_runtime_get_sync(&client->dev);
 788         if (ret < 0)
 789                 return ret;
 790
 791         set_bit(I2C_HID_STARTED, &ihid->flags);
 792         return 0;
 793 }
 794
 795 static void i2c_hid_close(struct hid_device *hid)
 796 {
 797         struct i2c_client *client = hid->driver_data;
 798         struct i2c_hid *ihid = i2c_get_clientdata(client);
 799
 800         clear_bit(I2C_HID_STARTED, &ihid->flags);
 801
 802         /* Save some power */
 803         pm_runtime_put(&client->dev);
 804 }
 805
 806 static int i2c_hid_power(struct hid_device *hid, int lvl)
 807 {
 808         struct i2c_client *client = hid->driver_data;
 809         struct i2c_hid *ihid = i2c_get_clientdata(client);
 810
 811         i2c_hid_dbg(ihid, "%s lvl:%d\n", __func__, lvl);
 812
 813         switch (lvl) {
 814         case PM_HINT_FULLON:
 815                 pm_runtime_get_sync(&client->dev);
 816                 break;
 817         case PM_HINT_NORMAL:
 818                 pm_runtime_put(&client->dev);
 819                 break;
 820         }
 821         return 0;
 822 }
 823
 824 struct hid_ll_driver i2c_hid_ll_driver = {
 825         .parse = i2c_hid_parse,
 826         .start = i2c_hid_start,
 827         .stop = i2c_hid_stop,
 828         .open = i2c_hid_open,
 829         .close = i2c_hid_close,
 830         .power = i2c_hid_power,
 831         .output_report = i2c_hid_output_report,
 832         .raw_request = i2c_hid_raw_request,
 833 };
 834 EXPORT_SYMBOL_GPL(i2c_hid_ll_driver);
 835
 836 static int i2c_hid_init_irq(struct i2c_client *client)
 837 {
 838         struct i2c_hid *ihid = i2c_get_clientdata(client);
 839         unsigned long irqflags = 0;
 840         int ret;
 841
 842         dev_dbg(&client->dev, "Requesting IRQ: %d\n", client->irq);
 843
 844         if (!irq_get_trigger_type(client->irq))
 845                 irqflags = IRQF_TRIGGER_LOW;
 846
 847         ret = request_threaded_irq(client->irq, NULL, i2c_hid_irq,
 848                                    irqflags | IRQF_ONESHOT, client->name, ihid);
 849         if (ret < 0) {
 850                 dev_warn(&client->dev,
 851                         "Could not register for %s interrupt, irq = %d,"
 852                         " ret = %d\n",
 853                         client->name, client->irq, ret);
 854
 855                 return ret;
 856         }
 857
 858         return 0;
 859 }
 860
 861 static int i2c_hid_fetch_hid_descriptor(struct i2c_hid *ihid)
 862 {
 863         struct i2c_client *client = ihid->client;
 864         struct i2c_hid_desc *hdesc = &ihid->hdesc;
 865         unsigned int dsize;
 866         int ret;
 867
 868         /* i2c hid fetch using a fixed descriptor size (30 bytes) */
 869         if (i2c_hid_get_dmi_i2c_hid_desc_override(client->name)) {
 870                 i2c_hid_dbg(ihid, "Using a HID descriptor override\n");
 871                 ihid->hdesc =
 872                         *i2c_hid_get_dmi_i2c_hid_desc_override(client->name);
 873         } else {
 874                 i2c_hid_dbg(ihid, "Fetching the HID descriptor\n");
 875                 ret = i2c_hid_command(client, &hid_descr_cmd,
 876                                       ihid->hdesc_buffer,
 877                                       sizeof(struct i2c_hid_desc));
 878                 if (ret) {
 879                         dev_err(&client->dev, "hid_descr_cmd failed\n");
 880                         return -ENODEV;
 881                 }
 882         }
 883
 884         /* Validate the length of HID descriptor, the 4 first bytes:
 885          * bytes 0-1 -> length
 886          * bytes 2-3 -> bcdVersion (has to be 1.00) */
 887         /* check bcdVersion == 1.0 */
 888         if (le16_to_cpu(hdesc->bcdVersion) != 0x0100) {
 889                 dev_err(&client->dev,
 890                         "unexpected HID descriptor bcdVersion (0x%04hx)\n",
 891                         le16_to_cpu(hdesc->bcdVersion));
 892                 return -ENODEV;
 893         }
 894
 895         /* Descriptor length should be 30 bytes as per the specification */
 896         dsize = le16_to_cpu(hdesc->wHIDDescLength);
 897         if (dsize != sizeof(struct i2c_hid_desc)) {
 898                 dev_err(&client->dev, "weird size of HID descriptor (%u)\n",
 899                         dsize);
 900                 return -ENODEV;
 901         }
 902         i2c_hid_dbg(ihid, "HID Descriptor: %*ph\n", dsize, ihid->hdesc_buffer);
 903         return 0;
 904 }
 905
 906 #ifdef CONFIG_ACPI
 907 static const struct acpi_device_id i2c_hid_acpi_blacklist[] = {
 908         /*
 909          * The CHPN0001 ACPI device, which is used to describe the Chipone
 910          * ICN8505 controller, has a _CID of PNP0C50 but is not HID compatible.
 911          */
 912         {"CHPN0001", 0 },
 913         { },
 914 };
 915
 916 static int i2c_hid_acpi_pdata(struct i2c_client *client,
 917                 struct i2c_hid_platform_data *pdata)
 918 {
 919         static guid_t i2c_hid_guid =
 920                 GUID_INIT(0x3CDFF6F7, 0x4267, 0x4555,
 921                           0xAD, 0x05, 0xB3, 0x0A, 0x3D, 0x89, 0x38, 0xDE);
 922         union acpi_object *obj;
 923         struct acpi_device *adev;
 924         acpi_handle handle;
 925
 926         handle = ACPI_HANDLE(&client->dev);
 927         if (!handle || acpi_bus_get_device(handle, &adev)) {
 928                 dev_err(&client->dev, "Error could not get ACPI device\n");
 929                 return -ENODEV;
 930         }
 931
 932         if (acpi_match_device_ids(adev, i2c_hid_acpi_blacklist) == 0)
 933                 return -ENODEV;
 934
 935         obj = acpi_evaluate_dsm_typed(handle, &i2c_hid_guid, 1, 1, NULL,
 936                                       ACPI_TYPE_INTEGER);
 937         if (!obj) {
 938                 dev_err(&client->dev, "Error _DSM call to get HID descriptor address failed\n");
 939                 return -ENODEV;
 940         }
 941
 942         pdata->hid_descriptor_address = obj->integer.value;
 943         ACPI_FREE(obj);
 944
 945         return 0;
 946 }
 947
 948 static void i2c_hid_acpi_fix_up_power(struct device *dev)
 949 {
 950         struct acpi_device *adev;
 951
 952         adev = ACPI_COMPANION(dev);
 953         if (adev)
 954                 acpi_device_fix_up_power(adev);
 955 }
 956
 957 static const struct acpi_device_id i2c_hid_acpi_match[] = {
 958         {"ACPI0C50", 0 },
 959         {"PNP0C50", 0 },
 960         { },
 961 };
 962 MODULE_DEVICE_TABLE(acpi, i2c_hid_acpi_match);
 963 #else
 964 static inline int i2c_hid_acpi_pdata(struct i2c_client *client,
 965                 struct i2c_hid_platform_data *pdata)
 966 {
 967         return -ENODEV;
 968 }
 969
 970 static inline void i2c_hid_acpi_fix_up_power(struct device *dev) {}
 971 #endif
 972
 973 #ifdef CONFIG_OF
 974 static int i2c_hid_of_probe(struct i2c_client *client,
 975                 struct i2c_hid_platform_data *pdata)
 976 {
 977         struct device *dev = &client->dev;
 978         u32 val;
 979         int ret;
 980
 981         ret = of_property_read_u32(dev->of_node, "hid-descr-addr", &val);
 982         if (ret) {
 983                 dev_err(&client->dev, "HID register address not provided\n");
 984                 return -ENODEV;
 985         }
 986         if (val >> 16) {
 987                 dev_err(&client->dev, "Bad HID register address: 0x%08x\n",
 988                         val);
 989                 return -EINVAL;
 990         }
 991         pdata->hid_descriptor_address = val;
 992
 993         return 0;
 994 }
 995
 996 static const struct of_device_id i2c_hid_of_match[] = {
 997         { .compatible = "hid-over-i2c" },
 998         {},
 999 };
1000 MODULE_DEVICE_TABLE(of, i2c_hid_of_match);
1001 #else
1002 static inline int i2c_hid_of_probe(struct i2c_client *client,
1003                 struct i2c_hid_platform_data *pdata)
1004 {
1005         return -ENODEV;
1006 }
1007 #endif
1008
1009 static void i2c_hid_fwnode_probe(struct i2c_client *client,
1010                                  struct i2c_hid_platform_data *pdata)
1011 {
1012         u32 val;
1013
1014         if (!device_property_read_u32(&client->dev, "post-power-on-delay-ms",
1015                                       &val))
1016                 pdata->post_power_delay_ms = val;
1017 }
1018
1019 static int i2c_hid_probe(struct i2c_client *client,
1020                          const struct i2c_device_id *dev_id)
1021 {
1022         int ret;
1023         struct i2c_hid *ihid;
1024         struct hid_device *hid;
1025         __u16 hidRegister;
1026         struct i2c_hid_platform_data *platform_data = client->dev.platform_data;
1027
1028         dbg_hid("HID probe called for i2c 0x%02x\n", client->addr);
1029
1030         if (!client->irq) {
1031                 dev_err(&client->dev,
1032                         "HID over i2c has not been provided an Int IRQ\n");
1033                 return -EINVAL;
1034         }
1035
1036         if (client->irq < 0) {
1037                 if (client->irq != -EPROBE_DEFER)
1038                         dev_err(&client->dev,
1039                                 "HID over i2c doesn't have a valid IRQ\n");
1040                 return client->irq;
1041         }
1042
1043         ihid = devm_kzalloc(&client->dev, sizeof(*ihid), GFP_KERNEL);
1044         if (!ihid)
1045                 return -ENOMEM;
1046
1047         if (client->dev.of_node) {
1048                 ret = i2c_hid_of_probe(client, &ihid->pdata);
1049                 if (ret)
1050                         return ret;
1051         } else if (!platform_data) {
1052                 ret = i2c_hid_acpi_pdata(client, &ihid->pdata);
1053                 if (ret)
1054                         return ret;
1055         } else {
1056                 ihid->pdata = *platform_data;
1057         }
1058
1059         /* Parse platform agnostic common properties from ACPI / device tree */
1060         i2c_hid_fwnode_probe(client, &ihid->pdata);
1061
1062         ihid->pdata.supplies[0].supply = "vdd";
1063         ihid->pdata.supplies[1].supply = "vddl";
1064
1065         ret = devm_regulator_bulk_get(&client->dev,
1066                                       ARRAY_SIZE(ihid->pdata.supplies),
1067                                       ihid->pdata.supplies);
1068         if (ret)
1069                 return ret;
1070
1071         ret = regulator_bulk_enable(ARRAY_SIZE(ihid->pdata.supplies),
1072                                     ihid->pdata.supplies);
1073         if (ret < 0)
1074                 return ret;
1075
1076         if (ihid->pdata.post_power_delay_ms)
1077                 msleep(ihid->pdata.post_power_delay_ms);
1078
1079         i2c_set_clientdata(client, ihid);
1080
1081         ihid->client = client;
1082
1083         hidRegister = ihid->pdata.hid_descriptor_address;
1084         ihid->wHIDDescRegister = cpu_to_le16(hidRegister);
1085
1086         init_waitqueue_head(&ihid->wait);
1087         mutex_init(&ihid->reset_lock);
1088
1089         /* we need to allocate the command buffer without knowing the maximum
1090          * size of the reports. Let's use HID_MIN_BUFFER_SIZE, then we do the
1091          * real computation later. */
1092         ret = i2c_hid_alloc_buffers(ihid, HID_MIN_BUFFER_SIZE);
1093         if (ret < 0)
1094                 goto err_regulator;
1095
1096         i2c_hid_acpi_fix_up_power(&client->dev);
1097
1098         pm_runtime_get_noresume(&client->dev);
1099         pm_runtime_set_active(&client->dev);
1100         pm_runtime_enable(&client->dev);
1101         device_enable_async_suspend(&client->dev);
1102
1103         /* Make sure there is something at this address */
1104         ret = i2c_smbus_read_byte(client);
1105         if (ret < 0) {
1106                 dev_dbg(&client->dev, "nothing at this address: %d\n", ret);
1107                 ret = -ENXIO;
1108                 goto err_pm;
1109         }
1110
1111         ret = i2c_hid_fetch_hid_descriptor(ihid);
1112         if (ret < 0)
1113                 goto err_pm;
1114
1115         ret = i2c_hid_init_irq(client);
1116         if (ret < 0)
1117                 goto err_pm;
1118
1119         hid = hid_allocate_device();
1120         if (IS_ERR(hid)) {
1121                 ret = PTR_ERR(hid);
1122                 goto err_irq;
1123         }
1124
1125         ihid->hid = hid;
1126
1127         hid->driver_data = client;
1128         hid->ll_driver = &i2c_hid_ll_driver;
1129         hid->dev.parent = &client->dev;
1130         hid->bus = BUS_I2C;
1131         hid->version = le16_to_cpu(ihid->hdesc.bcdVersion);
1132         hid->vendor = le16_to_cpu(ihid->hdesc.wVendorID);
1133         hid->product = le16_to_cpu(ihid->hdesc.wProductID);
1134
1135         snprintf(hid->name, sizeof(hid->name), "%s %04hX:%04hX",
1136                  client->name, hid->vendor, hid->product);
1137         strlcpy(hid->phys, dev_name(&client->dev), sizeof(hid->phys));
1138
1139         ihid->quirks = i2c_hid_lookup_quirk(hid->vendor, hid->product);
1140
1141         ret = hid_add_device(hid);
1142         if (ret) {
1143                 if (ret != -ENODEV)
1144                         hid_err(client, "can't add hid device: %d\n", ret);
1145                 goto err_mem_free;
1146         }
1147
1148         if (!(ihid->quirks & I2C_HID_QUIRK_NO_RUNTIME_PM))
1149                 pm_runtime_put(&client->dev);
1150
1151         return 0;
1152
1153 err_mem_free:
1154         hid_destroy_device(hid);
1155
1156 err_irq:
1157         free_irq(client->irq, ihid);
1158
1159 err_pm:
1160         pm_runtime_put_noidle(&client->dev);
1161         pm_runtime_disable(&client->dev);
1162
1163 err_regulator:
1164         regulator_bulk_disable(ARRAY_SIZE(ihid->pdata.supplies),
1165                                ihid->pdata.supplies);
1166         i2c_hid_free_buffers(ihid);
1167         return ret;
1168 }
1169
1170 static int i2c_hid_remove(struct i2c_client *client)
1171 {
1172         struct i2c_hid *ihid = i2c_get_clientdata(client);
1173         struct hid_device *hid;
1174
1175         if (!(ihid->quirks & I2C_HID_QUIRK_NO_RUNTIME_PM))
1176                 pm_runtime_get_sync(&client->dev);
1177         pm_runtime_disable(&client->dev);
1178         pm_runtime_set_suspended(&client->dev);
1179         pm_runtime_put_noidle(&client->dev);
1180
1181         hid = ihid->hid;
1182         hid_destroy_device(hid);
1183
1184         free_irq(client->irq, ihid);
1185
1186         if (ihid->bufsize)
1187                 i2c_hid_free_buffers(ihid);
1188
1189         regulator_bulk_disable(ARRAY_SIZE(ihid->pdata.supplies),
1190                                ihid->pdata.supplies);
1191
1192         return 0;
1193 }
1194
1195 static void i2c_hid_shutdown(struct i2c_client *client)
1196 {
1197         struct i2c_hid *ihid = i2c_get_clientdata(client);
1198
1199         i2c_hid_set_power(client, I2C_HID_PWR_SLEEP);
1200         free_irq(client->irq, ihid);
1201 }
1202
1203 #ifdef CONFIG_PM_SLEEP
1204 static int i2c_hid_suspend(struct device *dev)
1205 {
1206         struct i2c_client *client = to_i2c_client(dev);
1207         struct i2c_hid *ihid = i2c_get_clientdata(client);
1208         struct hid_device *hid = ihid->hid;
1209         int ret;
1210         int wake_status;
1211
1212         if (hid->driver && hid->driver->suspend) {
1213                 /*
1214                  * Wake up the device so that IO issues in
1215                  * HID driver's suspend code can succeed.
1216                  */
1217                 ret = pm_runtime_resume(dev);
1218                 if (ret < 0)
1219                         return ret;
1220
1221                 ret = hid->driver->suspend(hid, PMSG_SUSPEND);
1222                 if (ret < 0)
1223                         return ret;
1224         }
1225
1226         if (!pm_runtime_suspended(dev)) {
1227                 /* Save some power */
1228                 i2c_hid_set_power(client, I2C_HID_PWR_SLEEP);
1229
1230                 disable_irq(client->irq);
1231         }
1232
1233         if (device_may_wakeup(&client->dev)) {
1234                 wake_status = enable_irq_wake(client->irq);
1235                 if (!wake_status)
1236                         ihid->irq_wake_enabled = true;
1237                 else
1238                         hid_warn(hid, "Failed to enable irq wake: %d\n",
1239                                 wake_status);
1240         } else {
1241                 regulator_bulk_disable(ARRAY_SIZE(ihid->pdata.supplies),
1242                                        ihid->pdata.supplies);
1243         }
1244
1245         return 0;
1246 }
1247
1248 static int i2c_hid_resume(struct device *dev)
1249 {
1250         int ret;
1251         struct i2c_client *client = to_i2c_client(dev);
1252         struct i2c_hid *ihid = i2c_get_clientdata(client);
1253         struct hid_device *hid = ihid->hid;
1254         int wake_status;
1255
1256         if (!device_may_wakeup(&client->dev)) {
1257                 ret = regulator_bulk_enable(ARRAY_SIZE(ihid->pdata.supplies),
1258                                             ihid->pdata.supplies);
1259                 if (ret)
1260                         hid_warn(hid, "Failed to enable supplies: %d\n", ret);
1261
1262                 if (ihid->pdata.post_power_delay_ms)
1263                         msleep(ihid->pdata.post_power_delay_ms);
1264         } else if (ihid->irq_wake_enabled) {
1265                 wake_status = disable_irq_wake(client->irq);
1266                 if (!wake_status)
1267                         ihid->irq_wake_enabled = false;
1268                 else
1269                         hid_warn(hid, "Failed to disable irq wake: %d\n",
1270                                 wake_status);
1271         }
1272
1273         /* We'll resume to full power */
1274         pm_runtime_disable(dev);
1275         pm_runtime_set_active(dev);
1276         pm_runtime_enable(dev);
1277
1278         enable_irq(client->irq);
1279
1280         /* Instead of resetting device, simply powers the device on. This
1281          * solves "incomplete reports" on Raydium devices 2386:3118 and
1282          * 2386:4B33 and fixes various SIS touchscreens no longer sending
1283          * data after a suspend/resume.
1284          */
1285         ret = i2c_hid_set_power(client, I2C_HID_PWR_ON);
1286         if (ret)
1287                 return ret;
1288
1289         if (hid->driver && hid->driver->reset_resume) {
1290                 ret = hid->driver->reset_resume(hid);
1291                 return ret;
1292         }
1293
1294         return 0;
1295 }
1296 #endif
1297
1298 #ifdef CONFIG_PM
1299 static int i2c_hid_runtime_suspend(struct device *dev)
1300 {
1301         struct i2c_client *client = to_i2c_client(dev);
1302
1303         i2c_hid_set_power(client, I2C_HID_PWR_SLEEP);
1304         disable_irq(client->irq);
1305         return 0;
1306 }
1307
1308 static int i2c_hid_runtime_resume(struct device *dev)
1309 {
1310         struct i2c_client *client = to_i2c_client(dev);
1311
1312         enable_irq(client->irq);
1313         i2c_hid_set_power(client, I2C_HID_PWR_ON);
1314         return 0;
1315 }
1316 #endif
1317
1318 static const struct dev_pm_ops i2c_hid_pm = {
1319         SET_SYSTEM_SLEEP_PM_OPS(i2c_hid_suspend, i2c_hid_resume)
1320         SET_RUNTIME_PM_OPS(i2c_hid_runtime_suspend, i2c_hid_runtime_resume,
1321                            NULL)
1322 };
1323
1324 static const struct i2c_device_id i2c_hid_id_table[] = {
1325         { "hid", 0 },
1326         { "hid-over-i2c", 0 },
1327         { },
1328 };
1329 MODULE_DEVICE_TABLE(i2c, i2c_hid_id_table);
1330
1331
1332 static struct i2c_driver i2c_hid_driver = {
1333         .driver = {
1334                 .name   = "i2c_hid",
1335                 .pm     = &i2c_hid_pm,
1336                 .acpi_match_table = ACPI_PTR(i2c_hid_acpi_match),
1337                 .of_match_table = of_match_ptr(i2c_hid_of_match),
1338         },
1339
1340         .probe          = i2c_hid_probe,
1341         .remove         = i2c_hid_remove,
1342         .shutdown       = i2c_hid_shutdown,
1343         .id_table       = i2c_hid_id_table,
1344 };
1345
1346 module_i2c_driver(i2c_hid_driver);
1347
1348 MODULE_DESCRIPTION("HID over I2C core driver");
1349 MODULE_AUTHOR("Benjamin Tissoires <benjamin.tissoires@gmail.com>");
1350 MODULE_LICENSE("GPL");