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         { I2C_VENDOR_ID_GOODIX, I2C_DEVICE_ID_GOODIX_01F0,
 183                 I2C_HID_QUIRK_NO_RUNTIME_PM },
 184         { 0, 0 }
 185 };
 186
 187 /*
 188  * i2c_hid_lookup_quirk: return any quirks associated with a I2C HID device
 189  * @idVendor: the 16-bit vendor ID
 190  * @idProduct: the 16-bit product ID
 191  *
 192  * Returns: a u32 quirks value.
 193  */
 194 static u32 i2c_hid_lookup_quirk(const u16 idVendor, const u16 idProduct)
 195 {
 196         u32 quirks = 0;
 197         int n;
 198
 199         for (n = 0; i2c_hid_quirks[n].idVendor; n++)
 200                 if (i2c_hid_quirks[n].idVendor == idVendor &&
 201                     (i2c_hid_quirks[n].idProduct == (__u16)HID_ANY_ID ||
 202                      i2c_hid_quirks[n].idProduct == idProduct))
 203                         quirks = i2c_hid_quirks[n].quirks;
 204
 205         return quirks;
 206 }
 207
 208 static int __i2c_hid_command(struct i2c_client *client,
 209                 const struct i2c_hid_cmd *command, u8 reportID,
 210                 u8 reportType, u8 *args, int args_len,
 211                 unsigned char *buf_recv, int data_len)
 212 {
 213         struct i2c_hid *ihid = i2c_get_clientdata(client);
 214         union command *cmd = (union command *)ihid->cmdbuf;
 215         int ret;
 216         struct i2c_msg msg[2];
 217         int msg_num = 1;
 218
 219         int length = command->length;
 220         bool wait = command->wait;
 221         unsigned int registerIndex = command->registerIndex;
 222
 223         /* special case for hid_descr_cmd */
 224         if (command == &hid_descr_cmd) {
 225                 cmd->c.reg = ihid->wHIDDescRegister;
 226         } else {
 227                 cmd->data[0] = ihid->hdesc_buffer[registerIndex];
 228                 cmd->data[1] = ihid->hdesc_buffer[registerIndex + 1];
 229         }
 230
 231         if (length > 2) {
 232                 cmd->c.opcode = command->opcode;
 233                 cmd->c.reportTypeID = reportID | reportType << 4;
 234         }
 235
 236         memcpy(cmd->data + length, args, args_len);
 237         length += args_len;
 238
 239         i2c_hid_dbg(ihid, "%s: cmd=%*ph\n", __func__, length, cmd->data);
 240
 241         msg[0].addr = client->addr;
 242         msg[0].flags = client->flags & I2C_M_TEN;
 243         msg[0].len = length;
 244         msg[0].buf = cmd->data;
 245         if (data_len > 0) {
 246                 msg[1].addr = client->addr;
 247                 msg[1].flags = client->flags & I2C_M_TEN;
 248                 msg[1].flags |= I2C_M_RD;
 249                 msg[1].len = data_len;
 250                 msg[1].buf = buf_recv;
 251                 msg_num = 2;
 252                 set_bit(I2C_HID_READ_PENDING, &ihid->flags);
 253         }
 254
 255         if (wait)
 256                 set_bit(I2C_HID_RESET_PENDING, &ihid->flags);
 257
 258         ret = i2c_transfer(client->adapter, msg, msg_num);
 259
 260         if (data_len > 0)
 261                 clear_bit(I2C_HID_READ_PENDING, &ihid->flags);
 262
 263         if (ret != msg_num)
 264                 return ret < 0 ? ret : -EIO;
 265
 266         ret = 0;
 267
 268         if (wait && (ihid->quirks & I2C_HID_QUIRK_NO_IRQ_AFTER_RESET)) {
 269                 msleep(100);
 270         } else if (wait) {
 271                 i2c_hid_dbg(ihid, "%s: waiting...\n", __func__);
 272                 if (!wait_event_timeout(ihid->wait,
 273                                 !test_bit(I2C_HID_RESET_PENDING, &ihid->flags),
 274                                 msecs_to_jiffies(5000)))
 275                         ret = -ENODATA;
 276                 i2c_hid_dbg(ihid, "%s: finished.\n", __func__);
 277         }
 278
 279         return ret;
 280 }
 281
 282 static int i2c_hid_command(struct i2c_client *client,
 283                 const struct i2c_hid_cmd *command,
 284                 unsigned char *buf_recv, int data_len)
 285 {
 286         return __i2c_hid_command(client, command, 0, 0, NULL, 0,
 287                                 buf_recv, data_len);
 288 }
 289
 290 static int i2c_hid_get_report(struct i2c_client *client, u8 reportType,
 291                 u8 reportID, unsigned char *buf_recv, int data_len)
 292 {
 293         struct i2c_hid *ihid = i2c_get_clientdata(client);
 294         u8 args[3];
 295         int ret;
 296         int args_len = 0;
 297         u16 readRegister = le16_to_cpu(ihid->hdesc.wDataRegister);
 298
 299         i2c_hid_dbg(ihid, "%s\n", __func__);
 300
 301         if (reportID >= 0x0F) {
 302                 args[args_len++] = reportID;
 303                 reportID = 0x0F;
 304         }
 305
 306         args[args_len++] = readRegister & 0xFF;
 307         args[args_len++] = readRegister >> 8;
 308
 309         ret = __i2c_hid_command(client, &hid_get_report_cmd, reportID,
 310                 reportType, args, args_len, buf_recv, data_len);
 311         if (ret) {
 312                 dev_err(&client->dev,
 313                         "failed to retrieve report from device.\n");
 314                 return ret;
 315         }
 316
 317         return 0;
 318 }
 319
 320 /**
 321  * i2c_hid_set_or_send_report: forward an incoming report to the device
 322  * @client: the i2c_client of the device
 323  * @reportType: 0x03 for HID_FEATURE_REPORT ; 0x02 for HID_OUTPUT_REPORT
 324  * @reportID: the report ID
 325  * @buf: the actual data to transfer, without the report ID
 326  * @len: size of buf
 327  * @use_data: true: use SET_REPORT HID command, false: send plain OUTPUT report
 328  */
 329 static int i2c_hid_set_or_send_report(struct i2c_client *client, u8 reportType,
 330                 u8 reportID, unsigned char *buf, size_t data_len, bool use_data)
 331 {
 332         struct i2c_hid *ihid = i2c_get_clientdata(client);
 333         u8 *args = ihid->argsbuf;
 334         const struct i2c_hid_cmd *hidcmd;
 335         int ret;
 336         u16 dataRegister = le16_to_cpu(ihid->hdesc.wDataRegister);
 337         u16 outputRegister = le16_to_cpu(ihid->hdesc.wOutputRegister);
 338         u16 maxOutputLength = le16_to_cpu(ihid->hdesc.wMaxOutputLength);
 339         u16 size;
 340         int args_len;
 341         int index = 0;
 342
 343         i2c_hid_dbg(ihid, "%s\n", __func__);
 344
 345         if (data_len > ihid->bufsize)
 346                 return -EINVAL;
 347
 348         size =          2                       /* size */ +
 349                         (reportID ? 1 : 0)      /* reportID */ +
 350                         data_len                /* buf */;
 351         args_len =      (reportID >= 0x0F ? 1 : 0) /* optional third byte */ +
 352                         2                       /* dataRegister */ +
 353                         size                    /* args */;
 354
 355         if (!use_data && maxOutputLength == 0)
 356                 return -ENOSYS;
 357
 358         if (reportID >= 0x0F) {
 359                 args[index++] = reportID;
 360                 reportID = 0x0F;
 361         }
 362
 363         /*
 364          * use the data register for feature reports or if the device does not
 365          * support the output register
 366          */
 367         if (use_data) {
 368                 args[index++] = dataRegister & 0xFF;
 369                 args[index++] = dataRegister >> 8;
 370                 hidcmd = &hid_set_report_cmd;
 371         } else {
 372                 args[index++] = outputRegister & 0xFF;
 373                 args[index++] = outputRegister >> 8;
 374                 hidcmd = &hid_no_cmd;
 375         }
 376
 377         args[index++] = size & 0xFF;
 378         args[index++] = size >> 8;
 379
 380         if (reportID)
 381                 args[index++] = reportID;
 382
 383         memcpy(&args[index], buf, data_len);
 384
 385         ret = __i2c_hid_command(client, hidcmd, reportID,
 386                 reportType, args, args_len, NULL, 0);
 387         if (ret) {
 388                 dev_err(&client->dev, "failed to set a report to device.\n");
 389                 return ret;
 390         }
 391
 392         return data_len;
 393 }
 394
 395 static int i2c_hid_set_power(struct i2c_client *client, int power_state)
 396 {
 397         struct i2c_hid *ihid = i2c_get_clientdata(client);
 398         int ret;
 399         unsigned long now, delay;
 400
 401         i2c_hid_dbg(ihid, "%s\n", __func__);
 402
 403         /*
 404          * Some devices require to send a command to wakeup before power on.
 405          * The call will get a return value (EREMOTEIO) but device will be
 406          * triggered and activated. After that, it goes like a normal device.
 407          */
 408         if (power_state == I2C_HID_PWR_ON &&
 409             ihid->quirks & I2C_HID_QUIRK_SET_PWR_WAKEUP_DEV) {
 410                 ret = i2c_hid_command(client, &hid_set_power_cmd, NULL, 0);
 411
 412                 /* Device was already activated */
 413                 if (!ret)
 414                         goto set_pwr_exit;
 415         }
 416
 417         if (ihid->quirks & I2C_HID_QUIRK_DELAY_AFTER_SLEEP &&
 418             power_state == I2C_HID_PWR_ON) {
 419                 now = jiffies;
 420                 if (time_after(ihid->sleep_delay, now)) {
 421                         delay = jiffies_to_usecs(ihid->sleep_delay - now);
 422                         usleep_range(delay, delay + 1);
 423                 }
 424         }
 425
 426         ret = __i2c_hid_command(client, &hid_set_power_cmd, power_state,
 427                 0, NULL, 0, NULL, 0);
 428
 429         if (ihid->quirks & I2C_HID_QUIRK_DELAY_AFTER_SLEEP &&
 430             power_state == I2C_HID_PWR_SLEEP)
 431                 ihid->sleep_delay = jiffies + msecs_to_jiffies(20);
 432
 433         if (ret)
 434                 dev_err(&client->dev, "failed to change power setting.\n");
 435
 436 set_pwr_exit:
 437         return ret;
 438 }
 439
 440 static int i2c_hid_hwreset(struct i2c_client *client)
 441 {
 442         struct i2c_hid *ihid = i2c_get_clientdata(client);
 443         int ret;
 444
 445         i2c_hid_dbg(ihid, "%s\n", __func__);
 446
 447         /*
 448          * This prevents sending feature reports while the device is
 449          * being reset. Otherwise we may lose the reset complete
 450          * interrupt.
 451          */
 452         mutex_lock(&ihid->reset_lock);
 453
 454         ret = i2c_hid_set_power(client, I2C_HID_PWR_ON);
 455         if (ret)
 456                 goto out_unlock;
 457
 458         /*
 459          * The HID over I2C specification states that if a DEVICE needs time
 460          * after the PWR_ON request, it should utilise CLOCK stretching.
 461          * However, it has been observered that the Windows driver provides a
 462          * 1ms sleep between the PWR_ON and RESET requests and that some devices
 463          * rely on this.
 464          */
 465         usleep_range(1000, 5000);
 466
 467         i2c_hid_dbg(ihid, "resetting...\n");
 468
 469         ret = i2c_hid_command(client, &hid_reset_cmd, NULL, 0);
 470         if (ret) {
 471                 dev_err(&client->dev, "failed to reset device.\n");
 472                 i2c_hid_set_power(client, I2C_HID_PWR_SLEEP);
 473         }
 474
 475 out_unlock:
 476         mutex_unlock(&ihid->reset_lock);
 477         return ret;
 478 }
 479
 480 static void i2c_hid_get_input(struct i2c_hid *ihid)
 481 {
 482         int ret;
 483         u32 ret_size;
 484         int size = le16_to_cpu(ihid->hdesc.wMaxInputLength);
 485
 486         if (size > ihid->bufsize)
 487                 size = ihid->bufsize;
 488
 489         ret = i2c_master_recv(ihid->client, ihid->inbuf, size);
 490         if (ret != size) {
 491                 if (ret < 0)
 492                         return;
 493
 494                 dev_err(&ihid->client->dev, "%s: got %d data instead of %d\n",
 495                         __func__, ret, size);
 496                 return;
 497         }
 498
 499         ret_size = ihid->inbuf[0] | ihid->inbuf[1] << 8;
 500
 501         if (!ret_size) {
 502                 /* host or device initiated RESET completed */
 503                 if (test_and_clear_bit(I2C_HID_RESET_PENDING, &ihid->flags))
 504                         wake_up(&ihid->wait);
 505                 return;
 506         }
 507
 508         if ((ret_size > size) || (ret_size < 2)) {
 509                 dev_err(&ihid->client->dev, "%s: incomplete report (%d/%d)\n",
 510                         __func__, size, ret_size);
 511                 return;
 512         }
 513
 514         i2c_hid_dbg(ihid, "input: %*ph\n", ret_size, ihid->inbuf);
 515
 516         if (test_bit(I2C_HID_STARTED, &ihid->flags))
 517                 hid_input_report(ihid->hid, HID_INPUT_REPORT, ihid->inbuf + 2,
 518                                 ret_size - 2, 1);
 519
 520         return;
 521 }
 522
 523 static irqreturn_t i2c_hid_irq(int irq, void *dev_id)
 524 {
 525         struct i2c_hid *ihid = dev_id;
 526
 527         if (test_bit(I2C_HID_READ_PENDING, &ihid->flags))
 528                 return IRQ_HANDLED;
 529
 530         i2c_hid_get_input(ihid);
 531
 532         return IRQ_HANDLED;
 533 }
 534
 535 static int i2c_hid_get_report_length(struct hid_report *report)
 536 {
 537         return ((report->size - 1) >> 3) + 1 +
 538                 report->device->report_enum[report->type].numbered + 2;
 539 }
 540
 541 /*
 542  * Traverse the supplied list of reports and find the longest
 543  */
 544 static void i2c_hid_find_max_report(struct hid_device *hid, unsigned int type,
 545                 unsigned int *max)
 546 {
 547         struct hid_report *report;
 548         unsigned int size;
 549
 550         /* We should not rely on wMaxInputLength, as some devices may set it to
 551          * a wrong length. */
 552         list_for_each_entry(report, &hid->report_enum[type].report_list, list) {
 553                 size = i2c_hid_get_report_length(report);
 554                 if (*max < size)
 555                         *max = size;
 556         }
 557 }
 558
 559 static void i2c_hid_free_buffers(struct i2c_hid *ihid)
 560 {
 561         kfree(ihid->inbuf);
 562         kfree(ihid->rawbuf);
 563         kfree(ihid->argsbuf);
 564         kfree(ihid->cmdbuf);
 565         ihid->inbuf = NULL;
 566         ihid->rawbuf = NULL;
 567         ihid->cmdbuf = NULL;
 568         ihid->argsbuf = NULL;
 569         ihid->bufsize = 0;
 570 }
 571
 572 static int i2c_hid_alloc_buffers(struct i2c_hid *ihid, size_t report_size)
 573 {
 574         /* the worst case is computed from the set_report command with a
 575          * reportID > 15 and the maximum report length */
 576         int args_len = sizeof(__u8) + /* ReportID */
 577                        sizeof(__u8) + /* optional ReportID byte */
 578                        sizeof(__u16) + /* data register */
 579                        sizeof(__u16) + /* size of the report */
 580                        report_size; /* report */
 581
 582         ihid->inbuf = kzalloc(report_size, GFP_KERNEL);
 583         ihid->rawbuf = kzalloc(report_size, GFP_KERNEL);
 584         ihid->argsbuf = kzalloc(args_len, GFP_KERNEL);
 585         ihid->cmdbuf = kzalloc(sizeof(union command) + args_len, GFP_KERNEL);
 586
 587         if (!ihid->inbuf || !ihid->rawbuf || !ihid->argsbuf || !ihid->cmdbuf) {
 588                 i2c_hid_free_buffers(ihid);
 589                 return -ENOMEM;
 590         }
 591
 592         ihid->bufsize = report_size;
 593
 594         return 0;
 595 }
 596
 597 static int i2c_hid_get_raw_report(struct hid_device *hid,
 598                 unsigned char report_number, __u8 *buf, size_t count,
 599                 unsigned char report_type)
 600 {
 601         struct i2c_client *client = hid->driver_data;
 602         struct i2c_hid *ihid = i2c_get_clientdata(client);
 603         size_t ret_count, ask_count;
 604         int ret;
 605
 606         if (report_type == HID_OUTPUT_REPORT)
 607                 return -EINVAL;
 608
 609         /* +2 bytes to include the size of the reply in the query buffer */
 610         ask_count = min(count + 2, (size_t)ihid->bufsize);
 611
 612         ret = i2c_hid_get_report(client,
 613                         report_type == HID_FEATURE_REPORT ? 0x03 : 0x01,
 614                         report_number, ihid->rawbuf, ask_count);
 615
 616         if (ret < 0)
 617                 return ret;
 618
 619         ret_count = ihid->rawbuf[0] | (ihid->rawbuf[1] << 8);
 620
 621         if (ret_count <= 2)
 622                 return 0;
 623
 624         ret_count = min(ret_count, ask_count);
 625
 626         /* The query buffer contains the size, dropping it in the reply */
 627         count = min(count, ret_count - 2);
 628         memcpy(buf, ihid->rawbuf + 2, count);
 629
 630         return count;
 631 }
 632
 633 static int i2c_hid_output_raw_report(struct hid_device *hid, __u8 *buf,
 634                 size_t count, unsigned char report_type, bool use_data)
 635 {
 636         struct i2c_client *client = hid->driver_data;
 637         struct i2c_hid *ihid = i2c_get_clientdata(client);
 638         int report_id = buf[0];
 639         int ret;
 640
 641         if (report_type == HID_INPUT_REPORT)
 642                 return -EINVAL;
 643
 644         mutex_lock(&ihid->reset_lock);
 645
 646         if (report_id) {
 647                 buf++;
 648                 count--;
 649         }
 650
 651         ret = i2c_hid_set_or_send_report(client,
 652                                 report_type == HID_FEATURE_REPORT ? 0x03 : 0x02,
 653                                 report_id, buf, count, use_data);
 654
 655         if (report_id && ret >= 0)
 656                 ret++; /* add report_id to the number of transfered bytes */
 657
 658         mutex_unlock(&ihid->reset_lock);
 659
 660         return ret;
 661 }
 662
 663 static int i2c_hid_output_report(struct hid_device *hid, __u8 *buf,
 664                 size_t count)
 665 {
 666         return i2c_hid_output_raw_report(hid, buf, count, HID_OUTPUT_REPORT,
 667                         false);
 668 }
 669
 670 static int i2c_hid_raw_request(struct hid_device *hid, unsigned char reportnum,
 671                                __u8 *buf, size_t len, unsigned char rtype,
 672                                int reqtype)
 673 {
 674         switch (reqtype) {
 675         case HID_REQ_GET_REPORT:
 676                 return i2c_hid_get_raw_report(hid, reportnum, buf, len, rtype);
 677         case HID_REQ_SET_REPORT:
 678                 if (buf[0] != reportnum)
 679                         return -EINVAL;
 680                 return i2c_hid_output_raw_report(hid, buf, len, rtype, true);
 681         default:
 682                 return -EIO;
 683         }
 684 }
 685
 686 static int i2c_hid_parse(struct hid_device *hid)
 687 {
 688         struct i2c_client *client = hid->driver_data;
 689         struct i2c_hid *ihid = i2c_get_clientdata(client);
 690         struct i2c_hid_desc *hdesc = &ihid->hdesc;
 691         unsigned int rsize;
 692         char *rdesc;
 693         int ret;
 694         int tries = 3;
 695         char *use_override;
 696
 697         i2c_hid_dbg(ihid, "entering %s\n", __func__);
 698
 699         rsize = le16_to_cpu(hdesc->wReportDescLength);
 700         if (!rsize || rsize > HID_MAX_DESCRIPTOR_SIZE) {
 701                 dbg_hid("weird size of report descriptor (%u)\n", rsize);
 702                 return -EINVAL;
 703         }
 704
 705         do {
 706                 ret = i2c_hid_hwreset(client);
 707                 if (ret)
 708                         msleep(1000);
 709         } while (tries-- > 0 && ret);
 710
 711         if (ret)
 712                 return ret;
 713
 714         use_override = i2c_hid_get_dmi_hid_report_desc_override(client->name,
 715                                                                 &rsize);
 716
 717         if (use_override) {
 718                 rdesc = use_override;
 719                 i2c_hid_dbg(ihid, "Using a HID report descriptor override\n");
 720         } else {
 721                 rdesc = kzalloc(rsize, GFP_KERNEL);
 722
 723                 if (!rdesc) {
 724                         dbg_hid("couldn't allocate rdesc memory\n");
 725                         return -ENOMEM;
 726                 }
 727
 728                 i2c_hid_dbg(ihid, "asking HID report descriptor\n");
 729
 730                 ret = i2c_hid_command(client, &hid_report_descr_cmd,
 731                                       rdesc, rsize);
 732                 if (ret) {
 733                         hid_err(hid, "reading report descriptor failed\n");
 734                         kfree(rdesc);
 735                         return -EIO;
 736                 }
 737         }
 738
 739         i2c_hid_dbg(ihid, "Report Descriptor: %*ph\n", rsize, rdesc);
 740
 741         ret = hid_parse_report(hid, rdesc, rsize);
 742         if (!use_override)
 743                 kfree(rdesc);
 744
 745         if (ret) {
 746                 dbg_hid("parsing report descriptor failed\n");
 747                 return ret;
 748         }
 749
 750         return 0;
 751 }
 752
 753 static int i2c_hid_start(struct hid_device *hid)
 754 {
 755         struct i2c_client *client = hid->driver_data;
 756         struct i2c_hid *ihid = i2c_get_clientdata(client);
 757         int ret;
 758         unsigned int bufsize = HID_MIN_BUFFER_SIZE;
 759
 760         i2c_hid_find_max_report(hid, HID_INPUT_REPORT, &bufsize);
 761         i2c_hid_find_max_report(hid, HID_OUTPUT_REPORT, &bufsize);
 762         i2c_hid_find_max_report(hid, HID_FEATURE_REPORT, &bufsize);
 763
 764         if (bufsize > ihid->bufsize) {
 765                 disable_irq(client->irq);
 766                 i2c_hid_free_buffers(ihid);
 767
 768                 ret = i2c_hid_alloc_buffers(ihid, bufsize);
 769                 enable_irq(client->irq);
 770
 771                 if (ret)
 772                         return ret;
 773         }
 774
 775         return 0;
 776 }
 777
 778 static void i2c_hid_stop(struct hid_device *hid)
 779 {
 780         hid->claimed = 0;
 781 }
 782
 783 static int i2c_hid_open(struct hid_device *hid)
 784 {
 785         struct i2c_client *client = hid->driver_data;
 786         struct i2c_hid *ihid = i2c_get_clientdata(client);
 787         int ret = 0;
 788
 789         ret = pm_runtime_get_sync(&client->dev);
 790         if (ret < 0)
 791                 return ret;
 792
 793         set_bit(I2C_HID_STARTED, &ihid->flags);
 794         return 0;
 795 }
 796
 797 static void i2c_hid_close(struct hid_device *hid)
 798 {
 799         struct i2c_client *client = hid->driver_data;
 800         struct i2c_hid *ihid = i2c_get_clientdata(client);
 801
 802         clear_bit(I2C_HID_STARTED, &ihid->flags);
 803
 804         /* Save some power */
 805         pm_runtime_put(&client->dev);
 806 }
 807
 808 static int i2c_hid_power(struct hid_device *hid, int lvl)
 809 {
 810         struct i2c_client *client = hid->driver_data;
 811         struct i2c_hid *ihid = i2c_get_clientdata(client);
 812
 813         i2c_hid_dbg(ihid, "%s lvl:%d\n", __func__, lvl);
 814
 815         switch (lvl) {
 816         case PM_HINT_FULLON:
 817                 pm_runtime_get_sync(&client->dev);
 818                 break;
 819         case PM_HINT_NORMAL:
 820                 pm_runtime_put(&client->dev);
 821                 break;
 822         }
 823         return 0;
 824 }
 825
 826 struct hid_ll_driver i2c_hid_ll_driver = {
 827         .parse = i2c_hid_parse,
 828         .start = i2c_hid_start,
 829         .stop = i2c_hid_stop,
 830         .open = i2c_hid_open,
 831         .close = i2c_hid_close,
 832         .power = i2c_hid_power,
 833         .output_report = i2c_hid_output_report,
 834         .raw_request = i2c_hid_raw_request,
 835 };
 836 EXPORT_SYMBOL_GPL(i2c_hid_ll_driver);
 837
 838 static int i2c_hid_init_irq(struct i2c_client *client)
 839 {
 840         struct i2c_hid *ihid = i2c_get_clientdata(client);
 841         unsigned long irqflags = 0;
 842         int ret;
 843
 844         dev_dbg(&client->dev, "Requesting IRQ: %d\n", client->irq);
 845
 846         if (!irq_get_trigger_type(client->irq))
 847                 irqflags = IRQF_TRIGGER_LOW;
 848
 849         ret = request_threaded_irq(client->irq, NULL, i2c_hid_irq,
 850                                    irqflags | IRQF_ONESHOT, client->name, ihid);
 851         if (ret < 0) {
 852                 dev_warn(&client->dev,
 853                         "Could not register for %s interrupt, irq = %d,"
 854                         " ret = %d\n",
 855                         client->name, client->irq, ret);
 856
 857                 return ret;
 858         }
 859
 860         return 0;
 861 }
 862
 863 static int i2c_hid_fetch_hid_descriptor(struct i2c_hid *ihid)
 864 {
 865         struct i2c_client *client = ihid->client;
 866         struct i2c_hid_desc *hdesc = &ihid->hdesc;
 867         unsigned int dsize;
 868         int ret;
 869
 870         /* i2c hid fetch using a fixed descriptor size (30 bytes) */
 871         if (i2c_hid_get_dmi_i2c_hid_desc_override(client->name)) {
 872                 i2c_hid_dbg(ihid, "Using a HID descriptor override\n");
 873                 ihid->hdesc =
 874                         *i2c_hid_get_dmi_i2c_hid_desc_override(client->name);
 875         } else {
 876                 i2c_hid_dbg(ihid, "Fetching the HID descriptor\n");
 877                 ret = i2c_hid_command(client, &hid_descr_cmd,
 878                                       ihid->hdesc_buffer,
 879                                       sizeof(struct i2c_hid_desc));
 880                 if (ret) {
 881                         dev_err(&client->dev, "hid_descr_cmd failed\n");
 882                         return -ENODEV;
 883                 }
 884         }
 885
 886         /* Validate the length of HID descriptor, the 4 first bytes:
 887          * bytes 0-1 -> length
 888          * bytes 2-3 -> bcdVersion (has to be 1.00) */
 889         /* check bcdVersion == 1.0 */
 890         if (le16_to_cpu(hdesc->bcdVersion) != 0x0100) {
 891                 dev_err(&client->dev,
 892                         "unexpected HID descriptor bcdVersion (0x%04hx)\n",
 893                         le16_to_cpu(hdesc->bcdVersion));
 894                 return -ENODEV;
 895         }
 896
 897         /* Descriptor length should be 30 bytes as per the specification */
 898         dsize = le16_to_cpu(hdesc->wHIDDescLength);
 899         if (dsize != sizeof(struct i2c_hid_desc)) {
 900                 dev_err(&client->dev, "weird size of HID descriptor (%u)\n",
 901                         dsize);
 902                 return -ENODEV;
 903         }
 904         i2c_hid_dbg(ihid, "HID Descriptor: %*ph\n", dsize, ihid->hdesc_buffer);
 905         return 0;
 906 }
 907
 908 #ifdef CONFIG_ACPI
 909 static const struct acpi_device_id i2c_hid_acpi_blacklist[] = {
 910         /*
 911          * The CHPN0001 ACPI device, which is used to describe the Chipone
 912          * ICN8505 controller, has a _CID of PNP0C50 but is not HID compatible.
 913          */
 914         {"CHPN0001", 0 },
 915         { },
 916 };
 917
 918 static int i2c_hid_acpi_pdata(struct i2c_client *client,
 919                 struct i2c_hid_platform_data *pdata)
 920 {
 921         static guid_t i2c_hid_guid =
 922                 GUID_INIT(0x3CDFF6F7, 0x4267, 0x4555,
 923                           0xAD, 0x05, 0xB3, 0x0A, 0x3D, 0x89, 0x38, 0xDE);
 924         union acpi_object *obj;
 925         struct acpi_device *adev;
 926         acpi_handle handle;
 927
 928         handle = ACPI_HANDLE(&client->dev);
 929         if (!handle || acpi_bus_get_device(handle, &adev)) {
 930                 dev_err(&client->dev, "Error could not get ACPI device\n");
 931                 return -ENODEV;
 932         }
 933
 934         if (acpi_match_device_ids(adev, i2c_hid_acpi_blacklist) == 0)
 935                 return -ENODEV;
 936
 937         obj = acpi_evaluate_dsm_typed(handle, &i2c_hid_guid, 1, 1, NULL,
 938                                       ACPI_TYPE_INTEGER);
 939         if (!obj) {
 940                 dev_err(&client->dev, "Error _DSM call to get HID descriptor address failed\n");
 941                 return -ENODEV;
 942         }
 943
 944         pdata->hid_descriptor_address = obj->integer.value;
 945         ACPI_FREE(obj);
 946
 947         return 0;
 948 }
 949
 950 static void i2c_hid_acpi_fix_up_power(struct device *dev)
 951 {
 952         struct acpi_device *adev;
 953
 954         adev = ACPI_COMPANION(dev);
 955         if (adev)
 956                 acpi_device_fix_up_power(adev);
 957 }
 958
 959 static const struct acpi_device_id i2c_hid_acpi_match[] = {
 960         {"ACPI0C50", 0 },
 961         {"PNP0C50", 0 },
 962         { },
 963 };
 964 MODULE_DEVICE_TABLE(acpi, i2c_hid_acpi_match);
 965 #else
 966 static inline int i2c_hid_acpi_pdata(struct i2c_client *client,
 967                 struct i2c_hid_platform_data *pdata)
 968 {
 969         return -ENODEV;
 970 }
 971
 972 static inline void i2c_hid_acpi_fix_up_power(struct device *dev) {}
 973 #endif
 974
 975 #ifdef CONFIG_OF
 976 static int i2c_hid_of_probe(struct i2c_client *client,
 977                 struct i2c_hid_platform_data *pdata)
 978 {
 979         struct device *dev = &client->dev;
 980         u32 val;
 981         int ret;
 982
 983         ret = of_property_read_u32(dev->of_node, "hid-descr-addr", &val);
 984         if (ret) {
 985                 dev_err(&client->dev, "HID register address not provided\n");
 986                 return -ENODEV;
 987         }
 988         if (val >> 16) {
 989                 dev_err(&client->dev, "Bad HID register address: 0x%08x\n",
 990                         val);
 991                 return -EINVAL;
 992         }
 993         pdata->hid_descriptor_address = val;
 994
 995         return 0;
 996 }
 997
 998 static const struct of_device_id i2c_hid_of_match[] = {
 999         { .compatible = "hid-over-i2c" },
1000         {},
1001 };
1002 MODULE_DEVICE_TABLE(of, i2c_hid_of_match);
1003 #else
1004 static inline int i2c_hid_of_probe(struct i2c_client *client,
1005                 struct i2c_hid_platform_data *pdata)
1006 {
1007         return -ENODEV;
1008 }
1009 #endif
1010
1011 static void i2c_hid_fwnode_probe(struct i2c_client *client,
1012                                  struct i2c_hid_platform_data *pdata)
1013 {
1014         u32 val;
1015
1016         if (!device_property_read_u32(&client->dev, "post-power-on-delay-ms",
1017                                       &val))
1018                 pdata->post_power_delay_ms = val;
1019 }
1020
1021 static int i2c_hid_probe(struct i2c_client *client,
1022                          const struct i2c_device_id *dev_id)
1023 {
1024         int ret;
1025         struct i2c_hid *ihid;
1026         struct hid_device *hid;
1027         __u16 hidRegister;
1028         struct i2c_hid_platform_data *platform_data = client->dev.platform_data;
1029
1030         dbg_hid("HID probe called for i2c 0x%02x\n", client->addr);
1031
1032         if (!client->irq) {
1033                 dev_err(&client->dev,
1034                         "HID over i2c has not been provided an Int IRQ\n");
1035                 return -EINVAL;
1036         }
1037
1038         if (client->irq < 0) {
1039                 if (client->irq != -EPROBE_DEFER)
1040                         dev_err(&client->dev,
1041                                 "HID over i2c doesn't have a valid IRQ\n");
1042                 return client->irq;
1043         }
1044
1045         ihid = devm_kzalloc(&client->dev, sizeof(*ihid), GFP_KERNEL);
1046         if (!ihid)
1047                 return -ENOMEM;
1048
1049         if (client->dev.of_node) {
1050                 ret = i2c_hid_of_probe(client, &ihid->pdata);
1051                 if (ret)
1052                         return ret;
1053         } else if (!platform_data) {
1054                 ret = i2c_hid_acpi_pdata(client, &ihid->pdata);
1055                 if (ret)
1056                         return ret;
1057         } else {
1058                 ihid->pdata = *platform_data;
1059         }
1060
1061         /* Parse platform agnostic common properties from ACPI / device tree */
1062         i2c_hid_fwnode_probe(client, &ihid->pdata);
1063
1064         ihid->pdata.supplies[0].supply = "vdd";
1065         ihid->pdata.supplies[1].supply = "vddl";
1066
1067         ret = devm_regulator_bulk_get(&client->dev,
1068                                       ARRAY_SIZE(ihid->pdata.supplies),
1069                                       ihid->pdata.supplies);
1070         if (ret)
1071                 return ret;
1072
1073         ret = regulator_bulk_enable(ARRAY_SIZE(ihid->pdata.supplies),
1074                                     ihid->pdata.supplies);
1075         if (ret < 0)
1076                 return ret;
1077
1078         if (ihid->pdata.post_power_delay_ms)
1079                 msleep(ihid->pdata.post_power_delay_ms);
1080
1081         i2c_set_clientdata(client, ihid);
1082
1083         ihid->client = client;
1084
1085         hidRegister = ihid->pdata.hid_descriptor_address;
1086         ihid->wHIDDescRegister = cpu_to_le16(hidRegister);
1087
1088         init_waitqueue_head(&ihid->wait);
1089         mutex_init(&ihid->reset_lock);
1090
1091         /* we need to allocate the command buffer without knowing the maximum
1092          * size of the reports. Let's use HID_MIN_BUFFER_SIZE, then we do the
1093          * real computation later. */
1094         ret = i2c_hid_alloc_buffers(ihid, HID_MIN_BUFFER_SIZE);
1095         if (ret < 0)
1096                 goto err_regulator;
1097
1098         i2c_hid_acpi_fix_up_power(&client->dev);
1099
1100         pm_runtime_get_noresume(&client->dev);
1101         pm_runtime_set_active(&client->dev);
1102         pm_runtime_enable(&client->dev);
1103         device_enable_async_suspend(&client->dev);
1104
1105         /* Make sure there is something at this address */
1106         ret = i2c_smbus_read_byte(client);
1107         if (ret < 0) {
1108                 dev_dbg(&client->dev, "nothing at this address: %d\n", ret);
1109                 ret = -ENXIO;
1110                 goto err_pm;
1111         }
1112
1113         ret = i2c_hid_fetch_hid_descriptor(ihid);
1114         if (ret < 0)
1115                 goto err_pm;
1116
1117         ret = i2c_hid_init_irq(client);
1118         if (ret < 0)
1119                 goto err_pm;
1120
1121         hid = hid_allocate_device();
1122         if (IS_ERR(hid)) {
1123                 ret = PTR_ERR(hid);
1124                 goto err_irq;
1125         }
1126
1127         ihid->hid = hid;
1128
1129         hid->driver_data = client;
1130         hid->ll_driver = &i2c_hid_ll_driver;
1131         hid->dev.parent = &client->dev;
1132         hid->bus = BUS_I2C;
1133         hid->version = le16_to_cpu(ihid->hdesc.bcdVersion);
1134         hid->vendor = le16_to_cpu(ihid->hdesc.wVendorID);
1135         hid->product = le16_to_cpu(ihid->hdesc.wProductID);
1136
1137         snprintf(hid->name, sizeof(hid->name), "%s %04hX:%04hX",
1138                  client->name, hid->vendor, hid->product);
1139         strlcpy(hid->phys, dev_name(&client->dev), sizeof(hid->phys));
1140
1141         ihid->quirks = i2c_hid_lookup_quirk(hid->vendor, hid->product);
1142
1143         ret = hid_add_device(hid);
1144         if (ret) {
1145                 if (ret != -ENODEV)
1146                         hid_err(client, "can't add hid device: %d\n", ret);
1147                 goto err_mem_free;
1148         }
1149
1150         if (!(ihid->quirks & I2C_HID_QUIRK_NO_RUNTIME_PM))
1151                 pm_runtime_put(&client->dev);
1152
1153         return 0;
1154
1155 err_mem_free:
1156         hid_destroy_device(hid);
1157
1158 err_irq:
1159         free_irq(client->irq, ihid);
1160
1161 err_pm:
1162         pm_runtime_put_noidle(&client->dev);
1163         pm_runtime_disable(&client->dev);
1164
1165 err_regulator:
1166         regulator_bulk_disable(ARRAY_SIZE(ihid->pdata.supplies),
1167                                ihid->pdata.supplies);
1168         i2c_hid_free_buffers(ihid);
1169         return ret;
1170 }
1171
1172 static int i2c_hid_remove(struct i2c_client *client)
1173 {
1174         struct i2c_hid *ihid = i2c_get_clientdata(client);
1175         struct hid_device *hid;
1176
1177         if (!(ihid->quirks & I2C_HID_QUIRK_NO_RUNTIME_PM))
1178                 pm_runtime_get_sync(&client->dev);
1179         pm_runtime_disable(&client->dev);
1180         pm_runtime_set_suspended(&client->dev);
1181         pm_runtime_put_noidle(&client->dev);
1182
1183         hid = ihid->hid;
1184         hid_destroy_device(hid);
1185
1186         free_irq(client->irq, ihid);
1187
1188         if (ihid->bufsize)
1189                 i2c_hid_free_buffers(ihid);
1190
1191         regulator_bulk_disable(ARRAY_SIZE(ihid->pdata.supplies),
1192                                ihid->pdata.supplies);
1193
1194         return 0;
1195 }
1196
1197 static void i2c_hid_shutdown(struct i2c_client *client)
1198 {
1199         struct i2c_hid *ihid = i2c_get_clientdata(client);
1200
1201         i2c_hid_set_power(client, I2C_HID_PWR_SLEEP);
1202         free_irq(client->irq, ihid);
1203 }
1204
1205 #ifdef CONFIG_PM_SLEEP
1206 static int i2c_hid_suspend(struct device *dev)
1207 {
1208         struct i2c_client *client = to_i2c_client(dev);
1209         struct i2c_hid *ihid = i2c_get_clientdata(client);
1210         struct hid_device *hid = ihid->hid;
1211         int ret;
1212         int wake_status;
1213
1214         if (hid->driver && hid->driver->suspend) {
1215                 /*
1216                  * Wake up the device so that IO issues in
1217                  * HID driver's suspend code can succeed.
1218                  */
1219                 ret = pm_runtime_resume(dev);
1220                 if (ret < 0)
1221                         return ret;
1222
1223                 ret = hid->driver->suspend(hid, PMSG_SUSPEND);
1224                 if (ret < 0)
1225                         return ret;
1226         }
1227
1228         if (!pm_runtime_suspended(dev)) {
1229                 /* Save some power */
1230                 i2c_hid_set_power(client, I2C_HID_PWR_SLEEP);
1231
1232                 disable_irq(client->irq);
1233         }
1234
1235         if (device_may_wakeup(&client->dev)) {
1236                 wake_status = enable_irq_wake(client->irq);
1237                 if (!wake_status)
1238                         ihid->irq_wake_enabled = true;
1239                 else
1240                         hid_warn(hid, "Failed to enable irq wake: %d\n",
1241                                 wake_status);
1242         } else {
1243                 regulator_bulk_disable(ARRAY_SIZE(ihid->pdata.supplies),
1244                                        ihid->pdata.supplies);
1245         }
1246
1247         return 0;
1248 }
1249
1250 static int i2c_hid_resume(struct device *dev)
1251 {
1252         int ret;
1253         struct i2c_client *client = to_i2c_client(dev);
1254         struct i2c_hid *ihid = i2c_get_clientdata(client);
1255         struct hid_device *hid = ihid->hid;
1256         int wake_status;
1257
1258         if (!device_may_wakeup(&client->dev)) {
1259                 ret = regulator_bulk_enable(ARRAY_SIZE(ihid->pdata.supplies),
1260                                             ihid->pdata.supplies);
1261                 if (ret)
1262                         hid_warn(hid, "Failed to enable supplies: %d\n", ret);
1263
1264                 if (ihid->pdata.post_power_delay_ms)
1265                         msleep(ihid->pdata.post_power_delay_ms);
1266         } else if (ihid->irq_wake_enabled) {
1267                 wake_status = disable_irq_wake(client->irq);
1268                 if (!wake_status)
1269                         ihid->irq_wake_enabled = false;
1270                 else
1271                         hid_warn(hid, "Failed to disable irq wake: %d\n",
1272                                 wake_status);
1273         }
1274
1275         /* We'll resume to full power */
1276         pm_runtime_disable(dev);
1277         pm_runtime_set_active(dev);
1278         pm_runtime_enable(dev);
1279
1280         enable_irq(client->irq);
1281
1282         /* Instead of resetting device, simply powers the device on. This
1283          * solves "incomplete reports" on Raydium devices 2386:3118 and
1284          * 2386:4B33 and fixes various SIS touchscreens no longer sending
1285          * data after a suspend/resume.
1286          */
1287         ret = i2c_hid_set_power(client, I2C_HID_PWR_ON);
1288         if (ret)
1289                 return ret;
1290
1291         if (hid->driver && hid->driver->reset_resume) {
1292                 ret = hid->driver->reset_resume(hid);
1293                 return ret;
1294         }
1295
1296         return 0;
1297 }
1298 #endif
1299
1300 #ifdef CONFIG_PM
1301 static int i2c_hid_runtime_suspend(struct device *dev)
1302 {
1303         struct i2c_client *client = to_i2c_client(dev);
1304
1305         i2c_hid_set_power(client, I2C_HID_PWR_SLEEP);
1306         disable_irq(client->irq);
1307         return 0;
1308 }
1309
1310 static int i2c_hid_runtime_resume(struct device *dev)
1311 {
1312         struct i2c_client *client = to_i2c_client(dev);
1313
1314         enable_irq(client->irq);
1315         i2c_hid_set_power(client, I2C_HID_PWR_ON);
1316         return 0;
1317 }
1318 #endif
1319
1320 static const struct dev_pm_ops i2c_hid_pm = {
1321         SET_SYSTEM_SLEEP_PM_OPS(i2c_hid_suspend, i2c_hid_resume)
1322         SET_RUNTIME_PM_OPS(i2c_hid_runtime_suspend, i2c_hid_runtime_resume,
1323                            NULL)
1324 };
1325
1326 static const struct i2c_device_id i2c_hid_id_table[] = {
1327         { "hid", 0 },
1328         { "hid-over-i2c", 0 },
1329         { },
1330 };
1331 MODULE_DEVICE_TABLE(i2c, i2c_hid_id_table);
1332
1333
1334 static struct i2c_driver i2c_hid_driver = {
1335         .driver = {
1336                 .name   = "i2c_hid",
1337                 .pm     = &i2c_hid_pm,
1338                 .acpi_match_table = ACPI_PTR(i2c_hid_acpi_match),
1339                 .of_match_table = of_match_ptr(i2c_hid_of_match),
1340         },
1341
1342         .probe          = i2c_hid_probe,
1343         .remove         = i2c_hid_remove,
1344         .shutdown       = i2c_hid_shutdown,
1345         .id_table       = i2c_hid_id_table,
1346 };
1347
1348 module_i2c_driver(i2c_hid_driver);
1349
1350 MODULE_DESCRIPTION("HID over I2C core driver");
1351 MODULE_AUTHOR("Benjamin Tissoires <benjamin.tissoires@gmail.com>");
1352 MODULE_LICENSE("GPL");