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/rtc.h>
  22
  23 #define RV8803_I2C_TRY_COUNT            4
  24
  25 #define RV8803_SEC                      0x00
  26 #define RV8803_MIN                      0x01
  27 #define RV8803_HOUR                     0x02
  28 #define RV8803_WEEK                     0x03
  29 #define RV8803_DAY                      0x04
  30 #define RV8803_MONTH                    0x05
  31 #define RV8803_YEAR                     0x06
  32 #define RV8803_RAM                      0x07
  33 #define RV8803_ALARM_MIN                0x08
  34 #define RV8803_ALARM_HOUR               0x09
  35 #define RV8803_ALARM_WEEK_OR_DAY        0x0A
  36 #define RV8803_EXT                      0x0D
  37 #define RV8803_FLAG                     0x0E
  38 #define RV8803_CTRL                     0x0F
  39
  40 #define RV8803_EXT_WADA                 BIT(6)
  41
  42 #define RV8803_FLAG_V1F                 BIT(0)
  43 #define RV8803_FLAG_V2F                 BIT(1)
  44 #define RV8803_FLAG_AF                  BIT(3)
  45 #define RV8803_FLAG_TF                  BIT(4)
  46 #define RV8803_FLAG_UF                  BIT(5)
  47
  48 #define RV8803_CTRL_RESET               BIT(0)
  49
  50 #define RV8803_CTRL_EIE                 BIT(2)
  51 #define RV8803_CTRL_AIE                 BIT(3)
  52 #define RV8803_CTRL_TIE                 BIT(4)
  53 #define RV8803_CTRL_UIE                 BIT(5)
  54
  55 #define RX8900_BACKUP_CTRL              0x18
  56 #define RX8900_FLAG_SWOFF               BIT(2)
  57 #define RX8900_FLAG_VDETOFF             BIT(3)
  58
  59 enum rv8803_type {
  60         rv_8803,
  61         rx_8900
  62 };
  63
  64 struct rv8803_data {
  65         struct i2c_client *client;
  66         struct rtc_device *rtc;
  67         struct mutex flags_lock;
  68         u8 ctrl;
  69         enum rv8803_type type;
  70 };
  71
  72 static int rv8803_read_reg(const struct i2c_client *client, u8 reg)
  73 {
  74         int try = RV8803_I2C_TRY_COUNT;
  75         s32 ret;
  76
  77         /*
  78          * There is a 61µs window during which the RTC does not acknowledge I2C
  79          * transfers. In that case, ensure that there are multiple attempts.
  80          */
  81         do
  82                 ret = i2c_smbus_read_byte_data(client, reg);
  83         while ((ret == -ENXIO || ret == -EIO) && --try);
  84         if (ret < 0)
  85                 dev_err(&client->dev, "Unable to read register 0x%02x\n", reg);
  86
  87         return ret;
  88 }
  89
  90 static int rv8803_read_regs(const struct i2c_client *client,
  91                             u8 reg, u8 count, u8 *values)
  92 {
  93         int try = RV8803_I2C_TRY_COUNT;
  94         s32 ret;
  95
  96         do
  97                 ret = i2c_smbus_read_i2c_block_data(client, reg, count, values);
  98         while ((ret == -ENXIO || ret == -EIO) && --try);
  99         if (ret != count) {
 100                 dev_err(&client->dev,
 101                         "Unable to read registers 0x%02x..0x%02x\n",
 102                         reg, reg + count - 1);
 103                 return ret < 0 ? ret : -EIO;
 104         }
 105
 106         return 0;
 107 }
 108
 109 static int rv8803_write_reg(const struct i2c_client *client, u8 reg, u8 value)
 110 {
 111         int try = RV8803_I2C_TRY_COUNT;
 112         s32 ret;
 113
 114         do
 115                 ret = i2c_smbus_write_byte_data(client, reg, value);
 116         while ((ret == -ENXIO || ret == -EIO) && --try);
 117         if (ret)
 118                 dev_err(&client->dev, "Unable to write register 0x%02x\n", reg);
 119
 120         return ret;
 121 }
 122
 123 static int rv8803_write_regs(const struct i2c_client *client,
 124                              u8 reg, u8 count, const u8 *values)
 125 {
 126         int try = RV8803_I2C_TRY_COUNT;
 127         s32 ret;
 128
 129         do
 130                 ret = i2c_smbus_write_i2c_block_data(client, reg, count,
 131                                                      values);
 132         while ((ret == -ENXIO || ret == -EIO) && --try);
 133         if (ret)
 134                 dev_err(&client->dev,
 135                         "Unable to write registers 0x%02x..0x%02x\n",
 136                         reg, reg + count - 1);
 137
 138         return ret;
 139 }
 140
 141 static irqreturn_t rv8803_handle_irq(int irq, void *dev_id)
 142 {
 143         struct i2c_client *client = dev_id;
 144         struct rv8803_data *rv8803 = i2c_get_clientdata(client);
 145         unsigned long events = 0;
 146         int flags;
 147
 148         mutex_lock(&rv8803->flags_lock);
 149
 150         flags = rv8803_read_reg(client, RV8803_FLAG);
 151         if (flags <= 0) {
 152                 mutex_unlock(&rv8803->flags_lock);
 153                 return IRQ_NONE;
 154         }
 155
 156         if (flags & RV8803_FLAG_V1F)
 157                 dev_warn(&client->dev, "Voltage low, temperature compensation stopped.\n");
 158
 159         if (flags & RV8803_FLAG_V2F)
 160                 dev_warn(&client->dev, "Voltage low, data loss detected.\n");
 161
 162         if (flags & RV8803_FLAG_TF) {
 163                 flags &= ~RV8803_FLAG_TF;
 164                 rv8803->ctrl &= ~RV8803_CTRL_TIE;
 165                 events |= RTC_PF;
 166         }
 167
 168         if (flags & RV8803_FLAG_AF) {
 169                 flags &= ~RV8803_FLAG_AF;
 170                 rv8803->ctrl &= ~RV8803_CTRL_AIE;
 171                 events |= RTC_AF;
 172         }
 173
 174         if (flags & RV8803_FLAG_UF) {
 175                 flags &= ~RV8803_FLAG_UF;
 176                 rv8803->ctrl &= ~RV8803_CTRL_UIE;
 177                 events |= RTC_UF;
 178         }
 179
 180         if (events) {
 181                 rtc_update_irq(rv8803->rtc, 1, events);
 182                 rv8803_write_reg(client, RV8803_FLAG, flags);
 183                 rv8803_write_reg(rv8803->client, RV8803_CTRL, rv8803->ctrl);
 184         }
 185
 186         mutex_unlock(&rv8803->flags_lock);
 187
 188         return IRQ_HANDLED;
 189 }
 190
 191 static int rv8803_get_time(struct device *dev, struct rtc_time *tm)
 192 {
 193         struct rv8803_data *rv8803 = dev_get_drvdata(dev);
 194         u8 date1[7];
 195         u8 date2[7];
 196         u8 *date = date1;
 197         int ret, flags;
 198
 199         flags = rv8803_read_reg(rv8803->client, RV8803_FLAG);
 200         if (flags < 0)
 201                 return flags;
 202
 203         if (flags & RV8803_FLAG_V2F) {
 204                 dev_warn(dev, "Voltage low, data is invalid.\n");
 205                 return -EINVAL;
 206         }
 207
 208         ret = rv8803_read_regs(rv8803->client, RV8803_SEC, 7, date);
 209         if (ret)
 210                 return ret;
 211
 212         if ((date1[RV8803_SEC] & 0x7f) == bin2bcd(59)) {
 213                 ret = rv8803_read_regs(rv8803->client, RV8803_SEC, 7, date2);
 214                 if (ret)
 215                         return ret;
 216
 217                 if ((date2[RV8803_SEC] & 0x7f) != bin2bcd(59))
 218                         date = date2;
 219         }
 220
 221         tm->tm_sec  = bcd2bin(date[RV8803_SEC] & 0x7f);
 222         tm->tm_min  = bcd2bin(date[RV8803_MIN] & 0x7f);
 223         tm->tm_hour = bcd2bin(date[RV8803_HOUR] & 0x3f);
 224         tm->tm_wday = ilog2(date[RV8803_WEEK] & 0x7f);
 225         tm->tm_mday = bcd2bin(date[RV8803_DAY] & 0x3f);
 226         tm->tm_mon  = bcd2bin(date[RV8803_MONTH] & 0x1f) - 1;
 227         tm->tm_year = bcd2bin(date[RV8803_YEAR]) + 100;
 228
 229         return 0;
 230 }
 231
 232 static int rv8803_set_time(struct device *dev, struct rtc_time *tm)
 233 {
 234         struct rv8803_data *rv8803 = dev_get_drvdata(dev);
 235         u8 date[7];
 236         int ctrl, flags, ret;
 237
 238         if ((tm->tm_year < 100) || (tm->tm_year > 199))
 239                 return -EINVAL;
 240
 241         ctrl = rv8803_read_reg(rv8803->client, RV8803_CTRL);
 242         if (ctrl < 0)
 243                 return ctrl;
 244
 245         /* Stop the clock */
 246         ret = rv8803_write_reg(rv8803->client, RV8803_CTRL,
 247                                ctrl | RV8803_CTRL_RESET);
 248         if (ret)
 249                 return ret;
 250
 251         date[RV8803_SEC]   = bin2bcd(tm->tm_sec);
 252         date[RV8803_MIN]   = bin2bcd(tm->tm_min);
 253         date[RV8803_HOUR]  = bin2bcd(tm->tm_hour);
 254         date[RV8803_WEEK]  = 1 << (tm->tm_wday);
 255         date[RV8803_DAY]   = bin2bcd(tm->tm_mday);
 256         date[RV8803_MONTH] = bin2bcd(tm->tm_mon + 1);
 257         date[RV8803_YEAR]  = bin2bcd(tm->tm_year - 100);
 258
 259         ret = rv8803_write_regs(rv8803->client, RV8803_SEC, 7, date);
 260         if (ret)
 261                 return ret;
 262
 263         /* Restart the clock */
 264         ret = rv8803_write_reg(rv8803->client, RV8803_CTRL,
 265                                ctrl & ~RV8803_CTRL_RESET);
 266         if (ret)
 267                 return ret;
 268
 269         mutex_lock(&rv8803->flags_lock);
 270
 271         flags = rv8803_read_reg(rv8803->client, RV8803_FLAG);
 272         if (flags < 0) {
 273                 mutex_unlock(&rv8803->flags_lock);
 274                 return flags;
 275         }
 276
 277         ret = rv8803_write_reg(rv8803->client, RV8803_FLAG,
 278                                flags & ~(RV8803_FLAG_V1F | RV8803_FLAG_V2F));
 279
 280         mutex_unlock(&rv8803->flags_lock);
 281
 282         return ret;
 283 }
 284
 285 static int rv8803_get_alarm(struct device *dev, struct rtc_wkalrm *alrm)
 286 {
 287         struct rv8803_data *rv8803 = dev_get_drvdata(dev);
 288         struct i2c_client *client = rv8803->client;
 289         u8 alarmvals[3];
 290         int flags, ret;
 291
 292         ret = rv8803_read_regs(client, RV8803_ALARM_MIN, 3, alarmvals);
 293         if (ret)
 294                 return ret;
 295
 296         flags = rv8803_read_reg(client, RV8803_FLAG);
 297         if (flags < 0)
 298                 return flags;
 299
 300         alrm->time.tm_sec  = 0;
 301         alrm->time.tm_min  = bcd2bin(alarmvals[0] & 0x7f);
 302         alrm->time.tm_hour = bcd2bin(alarmvals[1] & 0x3f);
 303         alrm->time.tm_mday = bcd2bin(alarmvals[2] & 0x3f);
 304
 305         alrm->enabled = !!(rv8803->ctrl & RV8803_CTRL_AIE);
 306         alrm->pending = (flags & RV8803_FLAG_AF) && alrm->enabled;
 307
 308         return 0;
 309 }
 310
 311 static int rv8803_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
 312 {
 313         struct i2c_client *client = to_i2c_client(dev);
 314         struct rv8803_data *rv8803 = dev_get_drvdata(dev);
 315         u8 alarmvals[3];
 316         u8 ctrl[2];
 317         int ret, err;
 318
 319         /* The alarm has no seconds, round up to nearest minute */
 320         if (alrm->time.tm_sec) {
 321                 time64_t alarm_time = rtc_tm_to_time64(&alrm->time);
 322
 323                 alarm_time += 60 - alrm->time.tm_sec;
 324                 rtc_time64_to_tm(alarm_time, &alrm->time);
 325         }
 326
 327         mutex_lock(&rv8803->flags_lock);
 328
 329         ret = rv8803_read_regs(client, RV8803_FLAG, 2, ctrl);
 330         if (ret) {
 331                 mutex_unlock(&rv8803->flags_lock);
 332                 return ret;
 333         }
 334
 335         alarmvals[0] = bin2bcd(alrm->time.tm_min);
 336         alarmvals[1] = bin2bcd(alrm->time.tm_hour);
 337         alarmvals[2] = bin2bcd(alrm->time.tm_mday);
 338
 339         if (rv8803->ctrl & (RV8803_CTRL_AIE | RV8803_CTRL_UIE)) {
 340                 rv8803->ctrl &= ~(RV8803_CTRL_AIE | RV8803_CTRL_UIE);
 341                 err = rv8803_write_reg(rv8803->client, RV8803_CTRL,
 342                                        rv8803->ctrl);
 343                 if (err) {
 344                         mutex_unlock(&rv8803->flags_lock);
 345                         return err;
 346                 }
 347         }
 348
 349         ctrl[1] &= ~RV8803_FLAG_AF;
 350         err = rv8803_write_reg(rv8803->client, RV8803_FLAG, ctrl[1]);
 351         mutex_unlock(&rv8803->flags_lock);
 352         if (err)
 353                 return err;
 354
 355         err = rv8803_write_regs(rv8803->client, RV8803_ALARM_MIN, 3, alarmvals);
 356         if (err)
 357                 return err;
 358
 359         if (alrm->enabled) {
 360                 if (rv8803->rtc->uie_rtctimer.enabled)
 361                         rv8803->ctrl |= RV8803_CTRL_UIE;
 362                 if (rv8803->rtc->aie_timer.enabled)
 363                         rv8803->ctrl |= RV8803_CTRL_AIE;
 364
 365                 err = rv8803_write_reg(rv8803->client, RV8803_CTRL,
 366                                        rv8803->ctrl);
 367                 if (err)
 368                         return err;
 369         }
 370
 371         return 0;
 372 }
 373
 374 static int rv8803_alarm_irq_enable(struct device *dev, unsigned int enabled)
 375 {
 376         struct i2c_client *client = to_i2c_client(dev);
 377         struct rv8803_data *rv8803 = dev_get_drvdata(dev);
 378         int ctrl, flags, err;
 379
 380         ctrl = rv8803->ctrl;
 381
 382         if (enabled) {
 383                 if (rv8803->rtc->uie_rtctimer.enabled)
 384                         ctrl |= RV8803_CTRL_UIE;
 385                 if (rv8803->rtc->aie_timer.enabled)
 386                         ctrl |= RV8803_CTRL_AIE;
 387         } else {
 388                 if (!rv8803->rtc->uie_rtctimer.enabled)
 389                         ctrl &= ~RV8803_CTRL_UIE;
 390                 if (!rv8803->rtc->aie_timer.enabled)
 391                         ctrl &= ~RV8803_CTRL_AIE;
 392         }
 393
 394         mutex_lock(&rv8803->flags_lock);
 395         flags = rv8803_read_reg(client, RV8803_FLAG);
 396         if (flags < 0) {
 397                 mutex_unlock(&rv8803->flags_lock);
 398                 return flags;
 399         }
 400         flags &= ~(RV8803_FLAG_AF | RV8803_FLAG_UF);
 401         err = rv8803_write_reg(client, RV8803_FLAG, flags);
 402         mutex_unlock(&rv8803->flags_lock);
 403         if (err)
 404                 return err;
 405
 406         if (ctrl != rv8803->ctrl) {
 407                 rv8803->ctrl = ctrl;
 408                 err = rv8803_write_reg(client, RV8803_CTRL, rv8803->ctrl);
 409                 if (err)
 410                         return err;
 411         }
 412
 413         return 0;
 414 }
 415
 416 static int rv8803_ioctl(struct device *dev, unsigned int cmd, unsigned long arg)
 417 {
 418         struct i2c_client *client = to_i2c_client(dev);
 419         struct rv8803_data *rv8803 = dev_get_drvdata(dev);
 420         int flags, ret = 0;
 421
 422         switch (cmd) {
 423         case RTC_VL_READ:
 424                 flags = rv8803_read_reg(client, RV8803_FLAG);
 425                 if (flags < 0)
 426                         return flags;
 427
 428                 if (flags & RV8803_FLAG_V1F)
 429                         dev_warn(&client->dev, "Voltage low, temperature compensation stopped.\n");
 430
 431                 if (flags & RV8803_FLAG_V2F)
 432                         dev_warn(&client->dev, "Voltage low, data loss detected.\n");
 433
 434                 flags &= RV8803_FLAG_V1F | RV8803_FLAG_V2F;
 435
 436                 if (copy_to_user((void __user *)arg, &flags, sizeof(int)))
 437                         return -EFAULT;
 438
 439                 return 0;
 440
 441         case RTC_VL_CLR:
 442                 mutex_lock(&rv8803->flags_lock);
 443                 flags = rv8803_read_reg(client, RV8803_FLAG);
 444                 if (flags < 0) {
 445                         mutex_unlock(&rv8803->flags_lock);
 446                         return flags;
 447                 }
 448
 449                 flags &= ~(RV8803_FLAG_V1F | RV8803_FLAG_V2F);
 450                 ret = rv8803_write_reg(client, RV8803_FLAG, flags);
 451                 mutex_unlock(&rv8803->flags_lock);
 452                 if (ret)
 453                         return ret;
 454
 455                 return 0;
 456
 457         default:
 458                 return -ENOIOCTLCMD;
 459         }
 460 }
 461
 462 static ssize_t rv8803_nvram_write(struct file *filp, struct kobject *kobj,
 463                                   struct bin_attribute *attr,
 464                                   char *buf, loff_t off, size_t count)
 465 {
 466         struct device *dev = kobj_to_dev(kobj);
 467         struct i2c_client *client = to_i2c_client(dev);
 468         int ret;
 469
 470         ret = rv8803_write_reg(client, RV8803_RAM, buf[0]);
 471         if (ret)
 472                 return ret;
 473
 474         return 1;
 475 }
 476
 477 static ssize_t rv8803_nvram_read(struct file *filp, struct kobject *kobj,
 478                                  struct bin_attribute *attr,
 479                                  char *buf, loff_t off, size_t count)
 480 {
 481         struct device *dev = kobj_to_dev(kobj);
 482         struct i2c_client *client = to_i2c_client(dev);
 483         int ret;
 484
 485         ret = rv8803_read_reg(client, RV8803_RAM);
 486         if (ret < 0)
 487                 return ret;
 488
 489         buf[0] = ret;
 490
 491         return 1;
 492 }
 493
 494 static struct bin_attribute rv8803_nvram_attr = {
 495         .attr = {
 496                 .name = "nvram",
 497                 .mode = S_IRUGO | S_IWUSR,
 498         },
 499         .size = 1,
 500         .read = rv8803_nvram_read,
 501         .write = rv8803_nvram_write,
 502 };
 503
 504 static struct rtc_class_ops rv8803_rtc_ops = {
 505         .read_time = rv8803_get_time,
 506         .set_time = rv8803_set_time,
 507         .ioctl = rv8803_ioctl,
 508 };
 509
 510 static int rx8900_trickle_charger_init(struct rv8803_data *rv8803)
 511 {
 512         struct i2c_client *client = rv8803->client;
 513         struct device_node *node = client->dev.of_node;
 514         int err;
 515         u8 flags;
 516
 517         if (!node)
 518                 return 0;
 519
 520         if (rv8803->type != rx_8900)
 521                 return 0;
 522
 523         err = i2c_smbus_read_byte_data(rv8803->client, RX8900_BACKUP_CTRL);
 524         if (err < 0)
 525                 return err;
 526
 527         flags = ~(RX8900_FLAG_VDETOFF | RX8900_FLAG_SWOFF) & (u8)err;
 528
 529         if (of_property_read_bool(node, "epson,vdet-disable"))
 530                 flags |= RX8900_FLAG_VDETOFF;
 531
 532         if (of_property_read_bool(node, "trickle-diode-disable"))
 533                 flags |= RX8900_FLAG_SWOFF;
 534
 535         return i2c_smbus_write_byte_data(rv8803->client, RX8900_BACKUP_CTRL,
 536                                          flags);
 537 }
 538
 539 static int rv8803_probe(struct i2c_client *client,
 540                         const struct i2c_device_id *id)
 541 {
 542         struct i2c_adapter *adapter = to_i2c_adapter(client->dev.parent);
 543         struct rv8803_data *rv8803;
 544         int err, flags;
 545
 546         if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA |
 547                                      I2C_FUNC_SMBUS_I2C_BLOCK)) {
 548                 dev_err(&adapter->dev, "doesn't support I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_I2C_BLOCK\n");
 549                 return -EIO;
 550         }
 551
 552         rv8803 = devm_kzalloc(&client->dev, sizeof(struct rv8803_data),
 553                               GFP_KERNEL);
 554         if (!rv8803)
 555                 return -ENOMEM;
 556
 557         mutex_init(&rv8803->flags_lock);
 558         rv8803->client = client;
 559         rv8803->type = id->driver_data;
 560         i2c_set_clientdata(client, rv8803);
 561
 562         flags = rv8803_read_reg(client, RV8803_FLAG);
 563         if (flags < 0)
 564                 return flags;
 565
 566         if (flags & RV8803_FLAG_V1F)
 567                 dev_warn(&client->dev, "Voltage low, temperature compensation stopped.\n");
 568
 569         if (flags & RV8803_FLAG_V2F)
 570                 dev_warn(&client->dev, "Voltage low, data loss detected.\n");
 571
 572         if (flags & RV8803_FLAG_AF)
 573                 dev_warn(&client->dev, "An alarm maybe have been missed.\n");
 574
 575         if (client->irq > 0) {
 576                 err = devm_request_threaded_irq(&client->dev, client->irq,
 577                                                 NULL, rv8803_handle_irq,
 578                                                 IRQF_TRIGGER_LOW | IRQF_ONESHOT,
 579                                                 "rv8803", client);
 580                 if (err) {
 581                         dev_warn(&client->dev, "unable to request IRQ, alarms disabled\n");
 582                         client->irq = 0;
 583                 } else {
 584                         rv8803_rtc_ops.read_alarm = rv8803_get_alarm;
 585                         rv8803_rtc_ops.set_alarm = rv8803_set_alarm;
 586                         rv8803_rtc_ops.alarm_irq_enable = rv8803_alarm_irq_enable;
 587                 }
 588         }
 589
 590         rv8803->rtc = devm_rtc_device_register(&client->dev, client->name,
 591                                                &rv8803_rtc_ops, THIS_MODULE);
 592         if (IS_ERR(rv8803->rtc)) {
 593                 dev_err(&client->dev, "unable to register the class device\n");
 594                 return PTR_ERR(rv8803->rtc);
 595         }
 596
 597         err = rv8803_write_reg(rv8803->client, RV8803_EXT, RV8803_EXT_WADA);
 598         if (err)
 599                 return err;
 600
 601         err = rx8900_trickle_charger_init(rv8803);
 602         if (err) {
 603                 dev_err(&client->dev, "failed to init charger\n");
 604                 return err;
 605         }
 606
 607         err = device_create_bin_file(&client->dev, &rv8803_nvram_attr);
 608         if (err)
 609                 return err;
 610
 611         rv8803->rtc->max_user_freq = 1;
 612
 613         return 0;
 614 }
 615
 616 static int rv8803_remove(struct i2c_client *client)
 617 {
 618         device_remove_bin_file(&client->dev, &rv8803_nvram_attr);
 619
 620         return 0;
 621 }
 622
 623 static const struct i2c_device_id rv8803_id[] = {
 624         { "rv8803", rv_8803 },
 625         { "rx8900", rx_8900 },
 626         { }
 627 };
 628 MODULE_DEVICE_TABLE(i2c, rv8803_id);
 629
 630 static struct i2c_driver rv8803_driver = {
 631         .driver = {
 632                 .name = "rtc-rv8803",
 633         },
 634         .probe          = rv8803_probe,
 635         .remove         = rv8803_remove,
 636         .id_table       = rv8803_id,
 637 };
 638 module_i2c_driver(rv8803_driver);
 639
 640 MODULE_AUTHOR("Alexandre Belloni <alexandre.belloni@free-electrons.com>");
 641 MODULE_DESCRIPTION("Micro Crystal RV8803 RTC driver");
 642 MODULE_LICENSE("GPL v2");