drivers/rtc/rtc-rv8803.c

   1 /*
   2  * RTC driver for the Micro Crystal RV8803
   3  *
   4  * Copyright (C) 2015 Micro Crystal SA
   5  *
   6  * Alexandre Belloni <alexandre.belloni@free-electrons.com>
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 as
  10  * published by the Free Software Foundation.
  11  *
  12  */
  13
  14 #include <linux/bcd.h>
  15 #include <linux/bitops.h>
  16 #include <linux/log2.h>
  17 #include <linux/i2c.h>
  18 #include <linux/interrupt.h>
  19 #include <linux/kernel.h>
  20 #include <linux/module.h>
  21 #include <linux/of_device.h>
  22 #include <linux/rtc.h>
  23
  24 #define RV8803_I2C_TRY_COUNT            4
  25
  26 #define RV8803_SEC                      0x00
  27 #define RV8803_MIN                      0x01
  28 #define RV8803_HOUR                     0x02
  29 #define RV8803_WEEK                     0x03
  30 #define RV8803_DAY                      0x04
  31 #define RV8803_MONTH                    0x05
  32 #define RV8803_YEAR                     0x06
  33 #define RV8803_RAM                      0x07
  34 #define RV8803_ALARM_MIN                0x08
  35 #define RV8803_ALARM_HOUR               0x09
  36 #define RV8803_ALARM_WEEK_OR_DAY        0x0A
  37 #define RV8803_EXT                      0x0D
  38 #define RV8803_FLAG                     0x0E
  39 #define RV8803_CTRL                     0x0F
  40
  41 #define RV8803_EXT_WADA                 BIT(6)
  42
  43 #define RV8803_FLAG_V1F                 BIT(0)
  44 #define RV8803_FLAG_V2F                 BIT(1)
  45 #define RV8803_FLAG_AF                  BIT(3)
  46 #define RV8803_FLAG_TF                  BIT(4)
  47 #define RV8803_FLAG_UF                  BIT(5)
  48
  49 #define RV8803_CTRL_RESET               BIT(0)
  50
  51 #define RV8803_CTRL_EIE                 BIT(2)
  52 #define RV8803_CTRL_AIE                 BIT(3)
  53 #define RV8803_CTRL_TIE                 BIT(4)
  54 #define RV8803_CTRL_UIE                 BIT(5)
  55
  56 #define RX8900_BACKUP_CTRL              0x18
  57 #define RX8900_FLAG_SWOFF               BIT(2)
  58 #define RX8900_FLAG_VDETOFF             BIT(3)
  59
  60 enum rv8803_type {
  61         rv_8803,
  62         rx_8900
  63 };
  64
  65 struct rv8803_data {
  66         struct i2c_client *client;
  67         struct rtc_device *rtc;
  68         struct mutex flags_lock;
  69         u8 ctrl;
  70         enum rv8803_type type;
  71         struct nvmem_config nvmem_cfg;
  72 };
  73
  74 static int rv8803_read_reg(const struct i2c_client *client, u8 reg)
  75 {
  76         int try = RV8803_I2C_TRY_COUNT;
  77         s32 ret;
  78
  79         /*
  80          * There is a 61µs window during which the RTC does not acknowledge I2C
  81          * transfers. In that case, ensure that there are multiple attempts.
  82          */
  83         do
  84                 ret = i2c_smbus_read_byte_data(client, reg);
  85         while ((ret == -ENXIO || ret == -EIO) && --try);
  86         if (ret < 0)
  87                 dev_err(&client->dev, "Unable to read register 0x%02x\n", reg);
  88
  89         return ret;
  90 }
  91
  92 static int rv8803_read_regs(const struct i2c_client *client,
  93                             u8 reg, u8 count, u8 *values)
  94 {
  95         int try = RV8803_I2C_TRY_COUNT;
  96         s32 ret;
  97
  98         do
  99                 ret = i2c_smbus_read_i2c_block_data(client, reg, count, values);
 100         while ((ret == -ENXIO || ret == -EIO) && --try);
 101         if (ret != count) {
 102                 dev_err(&client->dev,
 103                         "Unable to read registers 0x%02x..0x%02x\n",
 104                         reg, reg + count - 1);
 105                 return ret < 0 ? ret : -EIO;
 106         }
 107
 108         return 0;
 109 }
 110
 111 static int rv8803_write_reg(const struct i2c_client *client, u8 reg, u8 value)
 112 {
 113         int try = RV8803_I2C_TRY_COUNT;
 114         s32 ret;
 115
 116         do
 117                 ret = i2c_smbus_write_byte_data(client, reg, value);
 118         while ((ret == -ENXIO || ret == -EIO) && --try);
 119         if (ret)
 120                 dev_err(&client->dev, "Unable to write register 0x%02x\n", reg);
 121
 122         return ret;
 123 }
 124
 125 static int rv8803_write_regs(const struct i2c_client *client,
 126                              u8 reg, u8 count, const u8 *values)
 127 {
 128         int try = RV8803_I2C_TRY_COUNT;
 129         s32 ret;
 130
 131         do
 132                 ret = i2c_smbus_write_i2c_block_data(client, reg, count,
 133                                                      values);
 134         while ((ret == -ENXIO || ret == -EIO) && --try);
 135         if (ret)
 136                 dev_err(&client->dev,
 137                         "Unable to write registers 0x%02x..0x%02x\n",
 138                         reg, reg + count - 1);
 139
 140         return ret;
 141 }
 142
 143 static irqreturn_t rv8803_handle_irq(int irq, void *dev_id)
 144 {
 145         struct i2c_client *client = dev_id;
 146         struct rv8803_data *rv8803 = i2c_get_clientdata(client);
 147         unsigned long events = 0;
 148         int flags;
 149
 150         mutex_lock(&rv8803->flags_lock);
 151
 152         flags = rv8803_read_reg(client, RV8803_FLAG);
 153         if (flags <= 0) {
 154                 mutex_unlock(&rv8803->flags_lock);
 155                 return IRQ_NONE;
 156         }
 157
 158         if (flags & RV8803_FLAG_V1F)
 159                 dev_warn(&client->dev, "Voltage low, temperature compensation stopped.\n");
 160
 161         if (flags & RV8803_FLAG_V2F)
 162                 dev_warn(&client->dev, "Voltage low, data loss detected.\n");
 163
 164         if (flags & RV8803_FLAG_TF) {
 165                 flags &= ~RV8803_FLAG_TF;
 166                 rv8803->ctrl &= ~RV8803_CTRL_TIE;
 167                 events |= RTC_PF;
 168         }
 169
 170         if (flags & RV8803_FLAG_AF) {
 171                 flags &= ~RV8803_FLAG_AF;
 172                 rv8803->ctrl &= ~RV8803_CTRL_AIE;
 173                 events |= RTC_AF;
 174         }
 175
 176         if (flags & RV8803_FLAG_UF) {
 177                 flags &= ~RV8803_FLAG_UF;
 178                 rv8803->ctrl &= ~RV8803_CTRL_UIE;
 179                 events |= RTC_UF;
 180         }
 181
 182         if (events) {
 183                 rtc_update_irq(rv8803->rtc, 1, events);
 184                 rv8803_write_reg(client, RV8803_FLAG, flags);
 185                 rv8803_write_reg(rv8803->client, RV8803_CTRL, rv8803->ctrl);
 186         }
 187
 188         mutex_unlock(&rv8803->flags_lock);
 189
 190         return IRQ_HANDLED;
 191 }
 192
 193 static int rv8803_get_time(struct device *dev, struct rtc_time *tm)
 194 {
 195         struct rv8803_data *rv8803 = dev_get_drvdata(dev);
 196         u8 date1[7];
 197         u8 date2[7];
 198         u8 *date = date1;
 199         int ret, flags;
 200
 201         flags = rv8803_read_reg(rv8803->client, RV8803_FLAG);
 202         if (flags < 0)
 203                 return flags;
 204
 205         if (flags & RV8803_FLAG_V2F) {
 206                 dev_warn(dev, "Voltage low, data is invalid.\n");
 207                 return -EINVAL;
 208         }
 209
 210         ret = rv8803_read_regs(rv8803->client, RV8803_SEC, 7, date);
 211         if (ret)
 212                 return ret;
 213
 214         if ((date1[RV8803_SEC] & 0x7f) == bin2bcd(59)) {
 215                 ret = rv8803_read_regs(rv8803->client, RV8803_SEC, 7, date2);
 216                 if (ret)
 217                         return ret;
 218
 219                 if ((date2[RV8803_SEC] & 0x7f) != bin2bcd(59))
 220                         date = date2;
 221         }
 222
 223         tm->tm_sec  = bcd2bin(date[RV8803_SEC] & 0x7f);
 224         tm->tm_min  = bcd2bin(date[RV8803_MIN] & 0x7f);
 225         tm->tm_hour = bcd2bin(date[RV8803_HOUR] & 0x3f);
 226         tm->tm_wday = ilog2(date[RV8803_WEEK] & 0x7f);
 227         tm->tm_mday = bcd2bin(date[RV8803_DAY] & 0x3f);
 228         tm->tm_mon  = bcd2bin(date[RV8803_MONTH] & 0x1f) - 1;
 229         tm->tm_year = bcd2bin(date[RV8803_YEAR]) + 100;
 230
 231         return 0;
 232 }
 233
 234 static int rv8803_set_time(struct device *dev, struct rtc_time *tm)
 235 {
 236         struct rv8803_data *rv8803 = dev_get_drvdata(dev);
 237         u8 date[7];
 238         int ctrl, flags, ret;
 239
 240         if ((tm->tm_year < 100) || (tm->tm_year > 199))
 241                 return -EINVAL;
 242
 243         ctrl = rv8803_read_reg(rv8803->client, RV8803_CTRL);
 244         if (ctrl < 0)
 245                 return ctrl;
 246
 247         /* Stop the clock */
 248         ret = rv8803_write_reg(rv8803->client, RV8803_CTRL,
 249                                ctrl | RV8803_CTRL_RESET);
 250         if (ret)
 251                 return ret;
 252
 253         date[RV8803_SEC]   = bin2bcd(tm->tm_sec);
 254         date[RV8803_MIN]   = bin2bcd(tm->tm_min);
 255         date[RV8803_HOUR]  = bin2bcd(tm->tm_hour);
 256         date[RV8803_WEEK]  = 1 << (tm->tm_wday);
 257         date[RV8803_DAY]   = bin2bcd(tm->tm_mday);
 258         date[RV8803_MONTH] = bin2bcd(tm->tm_mon + 1);
 259         date[RV8803_YEAR]  = bin2bcd(tm->tm_year - 100);
 260
 261         ret = rv8803_write_regs(rv8803->client, RV8803_SEC, 7, date);
 262         if (ret)
 263                 return ret;
 264
 265         /* Restart the clock */
 266         ret = rv8803_write_reg(rv8803->client, RV8803_CTRL,
 267                                ctrl & ~RV8803_CTRL_RESET);
 268         if (ret)
 269                 return ret;
 270
 271         mutex_lock(&rv8803->flags_lock);
 272
 273         flags = rv8803_read_reg(rv8803->client, RV8803_FLAG);
 274         if (flags < 0) {
 275                 mutex_unlock(&rv8803->flags_lock);
 276                 return flags;
 277         }
 278
 279         ret = rv8803_write_reg(rv8803->client, RV8803_FLAG,
 280                                flags & ~(RV8803_FLAG_V1F | RV8803_FLAG_V2F));
 281
 282         mutex_unlock(&rv8803->flags_lock);
 283
 284         return ret;
 285 }
 286
 287 static int rv8803_get_alarm(struct device *dev, struct rtc_wkalrm *alrm)
 288 {
 289         struct rv8803_data *rv8803 = dev_get_drvdata(dev);
 290         struct i2c_client *client = rv8803->client;
 291         u8 alarmvals[3];
 292         int flags, ret;
 293
 294         ret = rv8803_read_regs(client, RV8803_ALARM_MIN, 3, alarmvals);
 295         if (ret)
 296                 return ret;
 297
 298         flags = rv8803_read_reg(client, RV8803_FLAG);
 299         if (flags < 0)
 300                 return flags;
 301
 302         alrm->time.tm_sec  = 0;
 303         alrm->time.tm_min  = bcd2bin(alarmvals[0] & 0x7f);
 304         alrm->time.tm_hour = bcd2bin(alarmvals[1] & 0x3f);
 305         alrm->time.tm_mday = bcd2bin(alarmvals[2] & 0x3f);
 306
 307         alrm->enabled = !!(rv8803->ctrl & RV8803_CTRL_AIE);
 308         alrm->pending = (flags & RV8803_FLAG_AF) && alrm->enabled;
 309
 310         return 0;
 311 }
 312
 313 static int rv8803_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
 314 {
 315         struct i2c_client *client = to_i2c_client(dev);
 316         struct rv8803_data *rv8803 = dev_get_drvdata(dev);
 317         u8 alarmvals[3];
 318         u8 ctrl[2];
 319         int ret, err;
 320
 321         /* The alarm has no seconds, round up to nearest minute */
 322         if (alrm->time.tm_sec) {
 323                 time64_t alarm_time = rtc_tm_to_time64(&alrm->time);
 324
 325                 alarm_time += 60 - alrm->time.tm_sec;
 326                 rtc_time64_to_tm(alarm_time, &alrm->time);
 327         }
 328
 329         mutex_lock(&rv8803->flags_lock);
 330
 331         ret = rv8803_read_regs(client, RV8803_FLAG, 2, ctrl);
 332         if (ret) {
 333                 mutex_unlock(&rv8803->flags_lock);
 334                 return ret;
 335         }
 336
 337         alarmvals[0] = bin2bcd(alrm->time.tm_min);
 338         alarmvals[1] = bin2bcd(alrm->time.tm_hour);
 339         alarmvals[2] = bin2bcd(alrm->time.tm_mday);
 340
 341         if (rv8803->ctrl & (RV8803_CTRL_AIE | RV8803_CTRL_UIE)) {
 342                 rv8803->ctrl &= ~(RV8803_CTRL_AIE | RV8803_CTRL_UIE);
 343                 err = rv8803_write_reg(rv8803->client, RV8803_CTRL,
 344                                        rv8803->ctrl);
 345                 if (err) {
 346                         mutex_unlock(&rv8803->flags_lock);
 347                         return err;
 348                 }
 349         }
 350
 351         ctrl[1] &= ~RV8803_FLAG_AF;
 352         err = rv8803_write_reg(rv8803->client, RV8803_FLAG, ctrl[1]);
 353         mutex_unlock(&rv8803->flags_lock);
 354         if (err)
 355                 return err;
 356
 357         err = rv8803_write_regs(rv8803->client, RV8803_ALARM_MIN, 3, alarmvals);
 358         if (err)
 359                 return err;
 360
 361         if (alrm->enabled) {
 362                 if (rv8803->rtc->uie_rtctimer.enabled)
 363                         rv8803->ctrl |= RV8803_CTRL_UIE;
 364                 if (rv8803->rtc->aie_timer.enabled)
 365                         rv8803->ctrl |= RV8803_CTRL_AIE;
 366
 367                 err = rv8803_write_reg(rv8803->client, RV8803_CTRL,
 368                                        rv8803->ctrl);
 369                 if (err)
 370                         return err;
 371         }
 372
 373         return 0;
 374 }
 375
 376 static int rv8803_alarm_irq_enable(struct device *dev, unsigned int enabled)
 377 {
 378         struct i2c_client *client = to_i2c_client(dev);
 379         struct rv8803_data *rv8803 = dev_get_drvdata(dev);
 380         int ctrl, flags, err;
 381
 382         ctrl = rv8803->ctrl;
 383
 384         if (enabled) {
 385                 if (rv8803->rtc->uie_rtctimer.enabled)
 386                         ctrl |= RV8803_CTRL_UIE;
 387                 if (rv8803->rtc->aie_timer.enabled)
 388                         ctrl |= RV8803_CTRL_AIE;
 389         } else {
 390                 if (!rv8803->rtc->uie_rtctimer.enabled)
 391                         ctrl &= ~RV8803_CTRL_UIE;
 392                 if (!rv8803->rtc->aie_timer.enabled)
 393                         ctrl &= ~RV8803_CTRL_AIE;
 394         }
 395
 396         mutex_lock(&rv8803->flags_lock);
 397         flags = rv8803_read_reg(client, RV8803_FLAG);
 398         if (flags < 0) {
 399                 mutex_unlock(&rv8803->flags_lock);
 400                 return flags;
 401         }
 402         flags &= ~(RV8803_FLAG_AF | RV8803_FLAG_UF);
 403         err = rv8803_write_reg(client, RV8803_FLAG, flags);
 404         mutex_unlock(&rv8803->flags_lock);
 405         if (err)
 406                 return err;
 407
 408         if (ctrl != rv8803->ctrl) {
 409                 rv8803->ctrl = ctrl;
 410                 err = rv8803_write_reg(client, RV8803_CTRL, rv8803->ctrl);
 411                 if (err)
 412                         return err;
 413         }
 414
 415         return 0;
 416 }
 417
 418 static int rv8803_ioctl(struct device *dev, unsigned int cmd, unsigned long arg)
 419 {
 420         struct i2c_client *client = to_i2c_client(dev);
 421         struct rv8803_data *rv8803 = dev_get_drvdata(dev);
 422         int flags, ret = 0;
 423
 424         switch (cmd) {
 425         case RTC_VL_READ:
 426                 flags = rv8803_read_reg(client, RV8803_FLAG);
 427                 if (flags < 0)
 428                         return flags;
 429
 430                 if (flags & RV8803_FLAG_V1F)
 431                         dev_warn(&client->dev, "Voltage low, temperature compensation stopped.\n");
 432
 433                 if (flags & RV8803_FLAG_V2F)
 434                         dev_warn(&client->dev, "Voltage low, data loss detected.\n");
 435
 436                 flags &= RV8803_FLAG_V1F | RV8803_FLAG_V2F;
 437
 438                 if (copy_to_user((void __user *)arg, &flags, sizeof(int)))
 439                         return -EFAULT;
 440
 441                 return 0;
 442
 443         case RTC_VL_CLR:
 444                 mutex_lock(&rv8803->flags_lock);
 445                 flags = rv8803_read_reg(client, RV8803_FLAG);
 446                 if (flags < 0) {
 447                         mutex_unlock(&rv8803->flags_lock);
 448                         return flags;
 449                 }
 450
 451                 flags &= ~(RV8803_FLAG_V1F | RV8803_FLAG_V2F);
 452                 ret = rv8803_write_reg(client, RV8803_FLAG, flags);
 453                 mutex_unlock(&rv8803->flags_lock);
 454                 if (ret)
 455                         return ret;
 456
 457                 return 0;
 458
 459         default:
 460                 return -ENOIOCTLCMD;
 461         }
 462 }
 463
 464 static int rv8803_nvram_write(void *priv, unsigned int offset, void *val,
 465                               size_t bytes)
 466 {
 467         int ret;
 468
 469         ret = rv8803_write_reg(priv, RV8803_RAM, *(u8 *)val);
 470         if (ret)
 471                 return ret;
 472
 473         return 0;
 474 }
 475
 476 static int rv8803_nvram_read(void *priv, unsigned int offset,
 477                              void *val, size_t bytes)
 478 {
 479         int ret;
 480
 481         ret = rv8803_read_reg(priv, RV8803_RAM);
 482         if (ret < 0)
 483                 return ret;
 484
 485         *(u8 *)val = ret;
 486
 487         return 0;
 488 }
 489
 490 static struct rtc_class_ops rv8803_rtc_ops = {
 491         .read_time = rv8803_get_time,
 492         .set_time = rv8803_set_time,
 493         .ioctl = rv8803_ioctl,
 494 };
 495
 496 static int rx8900_trickle_charger_init(struct rv8803_data *rv8803)
 497 {
 498         struct i2c_client *client = rv8803->client;
 499         struct device_node *node = client->dev.of_node;
 500         int err;
 501         u8 flags;
 502
 503         if (!node)
 504                 return 0;
 505
 506         if (rv8803->type != rx_8900)
 507                 return 0;
 508
 509         err = i2c_smbus_read_byte_data(rv8803->client, RX8900_BACKUP_CTRL);
 510         if (err < 0)
 511                 return err;
 512
 513         flags = ~(RX8900_FLAG_VDETOFF | RX8900_FLAG_SWOFF) & (u8)err;
 514
 515         if (of_property_read_bool(node, "epson,vdet-disable"))
 516                 flags |= RX8900_FLAG_VDETOFF;
 517
 518         if (of_property_read_bool(node, "trickle-diode-disable"))
 519                 flags |= RX8900_FLAG_SWOFF;
 520
 521         return i2c_smbus_write_byte_data(rv8803->client, RX8900_BACKUP_CTRL,
 522                                          flags);
 523 }
 524
 525 static int rv8803_probe(struct i2c_client *client,
 526                         const struct i2c_device_id *id)
 527 {
 528         struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
 529         struct rv8803_data *rv8803;
 530         int err, flags;
 531
 532         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA |
 533                                      I2C_FUNC_SMBUS_I2C_BLOCK)) {
 534                 dev_err(&adapter->dev, "doesn't support I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_I2C_BLOCK\n");
 535                 return -EIO;
 536         }
 537
 538         rv8803 = devm_kzalloc(&client->dev, sizeof(struct rv8803_data),
 539                               GFP_KERNEL);
 540         if (!rv8803)
 541                 return -ENOMEM;
 542
 543         mutex_init(&rv8803->flags_lock);
 544         rv8803->client = client;
 545         if (client->dev.of_node)
 546                 rv8803->type = (enum rv8803_type)
 547                         of_device_get_match_data(&client->dev);
 548         else
 549                 rv8803->type = id->driver_data;
 550         i2c_set_clientdata(client, rv8803);
 551
 552         flags = rv8803_read_reg(client, RV8803_FLAG);
 553         if (flags < 0)
 554                 return flags;
 555
 556         if (flags & RV8803_FLAG_V1F)
 557                 dev_warn(&client->dev, "Voltage low, temperature compensation stopped.\n");
 558
 559         if (flags & RV8803_FLAG_V2F)
 560                 dev_warn(&client->dev, "Voltage low, data loss detected.\n");
 561
 562         if (flags & RV8803_FLAG_AF)
 563                 dev_warn(&client->dev, "An alarm maybe have been missed.\n");
 564
 565         rv8803->rtc = devm_rtc_allocate_device(&client->dev);
 566         if (IS_ERR(rv8803->rtc)) {
 567                 return PTR_ERR(rv8803->rtc);
 568         }
 569
 570         if (client->irq > 0) {
 571                 err = devm_request_threaded_irq(&client->dev, client->irq,
 572                                                 NULL, rv8803_handle_irq,
 573                                                 IRQF_TRIGGER_LOW | IRQF_ONESHOT,
 574                                                 "rv8803", client);
 575                 if (err) {
 576                         dev_warn(&client->dev, "unable to request IRQ, alarms disabled\n");
 577                         client->irq = 0;
 578                 } else {
 579                         rv8803_rtc_ops.read_alarm = rv8803_get_alarm;
 580                         rv8803_rtc_ops.set_alarm = rv8803_set_alarm;
 581                         rv8803_rtc_ops.alarm_irq_enable = rv8803_alarm_irq_enable;
 582                 }
 583         }
 584
 585         rv8803->nvmem_cfg.name = "rv8803_nvram",
 586         rv8803->nvmem_cfg.word_size = 1,
 587         rv8803->nvmem_cfg.stride = 1,
 588         rv8803->nvmem_cfg.size = 1,
 589         rv8803->nvmem_cfg.reg_read = rv8803_nvram_read,
 590         rv8803->nvmem_cfg.reg_write = rv8803_nvram_write,
 591         rv8803->nvmem_cfg.priv = client;
 592
 593         rv8803->rtc->ops = &rv8803_rtc_ops;
 594         rv8803->rtc->nvmem_config = &rv8803->nvmem_cfg;
 595         rv8803->rtc->nvram_old_abi = true;
 596         err = rtc_register_device(rv8803->rtc);
 597         if (err)
 598                 return err;
 599
 600         err = rv8803_write_reg(rv8803->client, RV8803_EXT, RV8803_EXT_WADA);
 601         if (err)
 602                 return err;
 603
 604         err = rx8900_trickle_charger_init(rv8803);
 605         if (err) {
 606                 dev_err(&client->dev, "failed to init charger\n");
 607                 return err;
 608         }
 609
 610         rv8803->rtc->max_user_freq = 1;
 611
 612         return 0;
 613 }
 614
 615 static const struct i2c_device_id rv8803_id[] = {
 616         { "rv8803", rv_8803 },
 617         { "rx8900", rx_8900 },
 618         { }
 619 };
 620 MODULE_DEVICE_TABLE(i2c, rv8803_id);
 621
 622 static const struct of_device_id rv8803_of_match[] = {
 623         {
 624                 .compatible = "microcrystal,rv8803",
 625                 .data = (void *)rx_8900
 626         },
 627         {
 628                 .compatible = "epson,rx8900",
 629                 .data = (void *)rx_8900
 630         },
 631         { }
 632 };
 633 MODULE_DEVICE_TABLE(of, rv8803_of_match);
 634
 635 static struct i2c_driver rv8803_driver = {
 636         .driver = {
 637                 .name = "rtc-rv8803",
 638                 .of_match_table = of_match_ptr(rv8803_of_match),
 639         },
 640         .probe          = rv8803_probe,
 641         .id_table       = rv8803_id,
 642 };
 643 module_i2c_driver(rv8803_driver);
 644
 645 MODULE_AUTHOR("Alexandre Belloni <alexandre.belloni@free-electrons.com>");
 646 MODULE_DESCRIPTION("Micro Crystal RV8803 RTC driver");
 647 MODULE_LICENSE("GPL v2");