linux/drivers/rtc/rtc-rv8803.c
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   1// SPDX-License-Identifier: GPL-2.0
   2/*
   3 * RTC driver for the Micro Crystal RV8803
   4 *
   5 * Copyright (C) 2015 Micro Crystal SA
   6 * Alexandre Belloni <alexandre.belloni@bootlin.com>
   7 *
   8 */
   9
  10#include <linux/bcd.h>
  11#include <linux/bitops.h>
  12#include <linux/log2.h>
  13#include <linux/i2c.h>
  14#include <linux/interrupt.h>
  15#include <linux/kernel.h>
  16#include <linux/module.h>
  17#include <linux/of_device.h>
  18#include <linux/rtc.h>
  19
  20#define RV8803_I2C_TRY_COUNT            4
  21
  22#define RV8803_SEC                      0x00
  23#define RV8803_MIN                      0x01
  24#define RV8803_HOUR                     0x02
  25#define RV8803_WEEK                     0x03
  26#define RV8803_DAY                      0x04
  27#define RV8803_MONTH                    0x05
  28#define RV8803_YEAR                     0x06
  29#define RV8803_RAM                      0x07
  30#define RV8803_ALARM_MIN                0x08
  31#define RV8803_ALARM_HOUR               0x09
  32#define RV8803_ALARM_WEEK_OR_DAY        0x0A
  33#define RV8803_EXT                      0x0D
  34#define RV8803_FLAG                     0x0E
  35#define RV8803_CTRL                     0x0F
  36
  37#define RV8803_EXT_WADA                 BIT(6)
  38
  39#define RV8803_FLAG_V1F                 BIT(0)
  40#define RV8803_FLAG_V2F                 BIT(1)
  41#define RV8803_FLAG_AF                  BIT(3)
  42#define RV8803_FLAG_TF                  BIT(4)
  43#define RV8803_FLAG_UF                  BIT(5)
  44
  45#define RV8803_CTRL_RESET               BIT(0)
  46
  47#define RV8803_CTRL_EIE                 BIT(2)
  48#define RV8803_CTRL_AIE                 BIT(3)
  49#define RV8803_CTRL_TIE                 BIT(4)
  50#define RV8803_CTRL_UIE                 BIT(5)
  51
  52#define RX8900_BACKUP_CTRL              0x18
  53#define RX8900_FLAG_SWOFF               BIT(2)
  54#define RX8900_FLAG_VDETOFF             BIT(3)
  55
  56enum rv8803_type {
  57        rv_8803,
  58        rx_8900
  59};
  60
  61struct rv8803_data {
  62        struct i2c_client *client;
  63        struct rtc_device *rtc;
  64        struct mutex flags_lock;
  65        u8 ctrl;
  66        enum rv8803_type type;
  67};
  68
  69static int rv8803_read_reg(const struct i2c_client *client, u8 reg)
  70{
  71        int try = RV8803_I2C_TRY_COUNT;
  72        s32 ret;
  73
  74        /*
  75         * There is a 61\xC2\xB5s window during which the RTC does not acknowledge I2C
  76         * transfers. In that case, ensure that there are multiple attempts.
  77         */
  78        do
  79                ret = i2c_smbus_read_byte_data(client, reg);
  80        while ((ret == -ENXIO || ret == -EIO) && --try);
  81        if (ret < 0)
  82                dev_err(&client->dev, "Unable to read register 0x%02x\n", reg);
  83
  84        return ret;
  85}
  86
  87static int rv8803_read_regs(const struct i2c_client *client,
  88                            u8 reg, u8 count, u8 *values)
  89{
  90        int try = RV8803_I2C_TRY_COUNT;
  91        s32 ret;
  92
  93        do
  94                ret = i2c_smbus_read_i2c_block_data(client, reg, count, values);
  95        while ((ret == -ENXIO || ret == -EIO) && --try);
  96        if (ret != count) {
  97                dev_err(&client->dev,
  98                        "Unable to read registers 0x%02x..0x%02x\n",
  99                        reg, reg + count - 1);
 100                return ret < 0 ? ret : -EIO;
 101        }
 102
 103        return 0;
 104}
 105
 106static int rv8803_write_reg(const struct i2c_client *client, u8 reg, u8 value)
 107{
 108        int try = RV8803_I2C_TRY_COUNT;
 109        s32 ret;
 110
 111        do
 112                ret = i2c_smbus_write_byte_data(client, reg, value);
 113        while ((ret == -ENXIO || ret == -EIO) && --try);
 114        if (ret)
 115                dev_err(&client->dev, "Unable to write register 0x%02x\n", reg);
 116
 117        return ret;
 118}
 119
 120static int rv8803_write_regs(const struct i2c_client *client,
 121                             u8 reg, u8 count, const u8 *values)
 122{
 123        int try = RV8803_I2C_TRY_COUNT;
 124        s32 ret;
 125
 126        do
 127                ret = i2c_smbus_write_i2c_block_data(client, reg, count,
 128                                                     values);
 129        while ((ret == -ENXIO || ret == -EIO) && --try);
 130        if (ret)
 131                dev_err(&client->dev,
 132                        "Unable to write registers 0x%02x..0x%02x\n",
 133                        reg, reg + count - 1);
 134
 135        return ret;
 136}
 137
 138static irqreturn_t rv8803_handle_irq(int irq, void *dev_id)
 139{
 140        struct i2c_client *client = dev_id;
 141        struct rv8803_data *rv8803 = i2c_get_clientdata(client);
 142        unsigned long events = 0;
 143        int flags;
 144
 145        mutex_lock(&rv8803->flags_lock);
 146
 147        flags = rv8803_read_reg(client, RV8803_FLAG);
 148        if (flags <= 0) {
 149                mutex_unlock(&rv8803->flags_lock);
 150                return IRQ_NONE;
 151        }
 152
 153        if (flags & RV8803_FLAG_V1F)
 154                dev_warn(&client->dev, "Voltage low, temperature compensation stopped.\n");
 155
 156        if (flags & RV8803_FLAG_V2F)
 157                dev_warn(&client->dev, "Voltage low, data loss detected.\n");
 158
 159        if (flags & RV8803_FLAG_TF) {
 160                flags &= ~RV8803_FLAG_TF;
 161                rv8803->ctrl &= ~RV8803_CTRL_TIE;
 162                events |= RTC_PF;
 163        }
 164
 165        if (flags & RV8803_FLAG_AF) {
 166                flags &= ~RV8803_FLAG_AF;
 167                rv8803->ctrl &= ~RV8803_CTRL_AIE;
 168                events |= RTC_AF;
 169        }
 170
 171        if (flags & RV8803_FLAG_UF) {
 172                flags &= ~RV8803_FLAG_UF;
 173                rv8803->ctrl &= ~RV8803_CTRL_UIE;
 174                events |= RTC_UF;
 175        }
 176
 177        if (events) {
 178                rtc_update_irq(rv8803->rtc, 1, events);
 179                rv8803_write_reg(client, RV8803_FLAG, flags);
 180                rv8803_write_reg(rv8803->client, RV8803_CTRL, rv8803->ctrl);
 181        }
 182
 183        mutex_unlock(&rv8803->flags_lock);
 184
 185        return IRQ_HANDLED;
 186}
 187
 188static int rv8803_get_time(struct device *dev, struct rtc_time *tm)
 189{
 190        struct rv8803_data *rv8803 = dev_get_drvdata(dev);
 191        u8 date1[7];
 192        u8 date2[7];
 193        u8 *date = date1;
 194        int ret, flags;
 195
 196        flags = rv8803_read_reg(rv8803->client, RV8803_FLAG);
 197        if (flags < 0)
 198                return flags;
 199
 200        if (flags & RV8803_FLAG_V2F) {
 201                dev_warn(dev, "Voltage low, data is invalid.\n");
 202                return -EINVAL;
 203        }
 204
 205        ret = rv8803_read_regs(rv8803->client, RV8803_SEC, 7, date);
 206        if (ret)
 207                return ret;
 208
 209        if ((date1[RV8803_SEC] & 0x7f) == bin2bcd(59)) {
 210                ret = rv8803_read_regs(rv8803->client, RV8803_SEC, 7, date2);
 211                if (ret)
 212                        return ret;
 213
 214                if ((date2[RV8803_SEC] & 0x7f) != bin2bcd(59))
 215                        date = date2;
 216        }
 217
 218        tm->tm_sec  = bcd2bin(date[RV8803_SEC] & 0x7f);
 219        tm->tm_min  = bcd2bin(date[RV8803_MIN] & 0x7f);
 220        tm->tm_hour = bcd2bin(date[RV8803_HOUR] & 0x3f);
 221        tm->tm_wday = ilog2(date[RV8803_WEEK] & 0x7f);
 222        tm->tm_mday = bcd2bin(date[RV8803_DAY] & 0x3f);
 223        tm->tm_mon  = bcd2bin(date[RV8803_MONTH] & 0x1f) - 1;
 224        tm->tm_year = bcd2bin(date[RV8803_YEAR]) + 100;
 225
 226        return 0;
 227}
 228
 229static int rv8803_set_time(struct device *dev, struct rtc_time *tm)
 230{
 231        struct rv8803_data *rv8803 = dev_get_drvdata(dev);
 232        u8 date[7];
 233        int ctrl, flags, ret;
 234
 235        ctrl = rv8803_read_reg(rv8803->client, RV8803_CTRL);
 236        if (ctrl < 0)
 237                return ctrl;
 238
 239        /* Stop the clock */
 240        ret = rv8803_write_reg(rv8803->client, RV8803_CTRL,
 241                               ctrl | RV8803_CTRL_RESET);
 242        if (ret)
 243                return ret;
 244
 245        date[RV8803_SEC]   = bin2bcd(tm->tm_sec);
 246        date[RV8803_MIN]   = bin2bcd(tm->tm_min);
 247        date[RV8803_HOUR]  = bin2bcd(tm->tm_hour);
 248        date[RV8803_WEEK]  = 1 << (tm->tm_wday);
 249        date[RV8803_DAY]   = bin2bcd(tm->tm_mday);
 250        date[RV8803_MONTH] = bin2bcd(tm->tm_mon + 1);
 251        date[RV8803_YEAR]  = bin2bcd(tm->tm_year - 100);
 252
 253        ret = rv8803_write_regs(rv8803->client, RV8803_SEC, 7, date);
 254        if (ret)
 255                return ret;
 256
 257        /* Restart the clock */
 258        ret = rv8803_write_reg(rv8803->client, RV8803_CTRL,
 259                               ctrl & ~RV8803_CTRL_RESET);
 260        if (ret)
 261                return ret;
 262
 263        mutex_lock(&rv8803->flags_lock);
 264
 265        flags = rv8803_read_reg(rv8803->client, RV8803_FLAG);
 266        if (flags < 0) {
 267                mutex_unlock(&rv8803->flags_lock);
 268                return flags;
 269        }
 270
 271        ret = rv8803_write_reg(rv8803->client, RV8803_FLAG,
 272                               flags & ~(RV8803_FLAG_V1F | RV8803_FLAG_V2F));
 273
 274        mutex_unlock(&rv8803->flags_lock);
 275
 276        return ret;
 277}
 278
 279static int rv8803_get_alarm(struct device *dev, struct rtc_wkalrm *alrm)
 280{
 281        struct rv8803_data *rv8803 = dev_get_drvdata(dev);
 282        struct i2c_client *client = rv8803->client;
 283        u8 alarmvals[3];
 284        int flags, ret;
 285
 286        ret = rv8803_read_regs(client, RV8803_ALARM_MIN, 3, alarmvals);
 287        if (ret)
 288                return ret;
 289
 290        flags = rv8803_read_reg(client, RV8803_FLAG);
 291        if (flags < 0)
 292                return flags;
 293
 294        alrm->time.tm_sec  = 0;
 295        alrm->time.tm_min  = bcd2bin(alarmvals[0] & 0x7f);
 296        alrm->time.tm_hour = bcd2bin(alarmvals[1] & 0x3f);
 297        alrm->time.tm_mday = bcd2bin(alarmvals[2] & 0x3f);
 298
 299        alrm->enabled = !!(rv8803->ctrl & RV8803_CTRL_AIE);
 300        alrm->pending = (flags & RV8803_FLAG_AF) && alrm->enabled;
 301
 302        return 0;
 303}
 304
 305static int rv8803_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
 306{
 307        struct i2c_client *client = to_i2c_client(dev);
 308        struct rv8803_data *rv8803 = dev_get_drvdata(dev);
 309        u8 alarmvals[3];
 310        u8 ctrl[2];
 311        int ret, err;
 312
 313        /* The alarm has no seconds, round up to nearest minute */
 314        if (alrm->time.tm_sec) {
 315                time64_t alarm_time = rtc_tm_to_time64(&alrm->time);
 316
 317                alarm_time += 60 - alrm->time.tm_sec;
 318                rtc_time64_to_tm(alarm_time, &alrm->time);
 319        }
 320
 321        mutex_lock(&rv8803->flags_lock);
 322
 323        ret = rv8803_read_regs(client, RV8803_FLAG, 2, ctrl);
 324        if (ret) {
 325                mutex_unlock(&rv8803->flags_lock);
 326                return ret;
 327        }
 328
 329        alarmvals[0] = bin2bcd(alrm->time.tm_min);
 330        alarmvals[1] = bin2bcd(alrm->time.tm_hour);
 331        alarmvals[2] = bin2bcd(alrm->time.tm_mday);
 332
 333        if (rv8803->ctrl & (RV8803_CTRL_AIE | RV8803_CTRL_UIE)) {
 334                rv8803->ctrl &= ~(RV8803_CTRL_AIE | RV8803_CTRL_UIE);
 335                err = rv8803_write_reg(rv8803->client, RV8803_CTRL,
 336                                       rv8803->ctrl);
 337                if (err) {
 338                        mutex_unlock(&rv8803->flags_lock);
 339                        return err;
 340                }
 341        }
 342
 343        ctrl[1] &= ~RV8803_FLAG_AF;
 344        err = rv8803_write_reg(rv8803->client, RV8803_FLAG, ctrl[1]);
 345        mutex_unlock(&rv8803->flags_lock);
 346        if (err)
 347                return err;
 348
 349        err = rv8803_write_regs(rv8803->client, RV8803_ALARM_MIN, 3, alarmvals);
 350        if (err)
 351                return err;
 352
 353        if (alrm->enabled) {
 354                if (rv8803->rtc->uie_rtctimer.enabled)
 355                        rv8803->ctrl |= RV8803_CTRL_UIE;
 356                if (rv8803->rtc->aie_timer.enabled)
 357                        rv8803->ctrl |= RV8803_CTRL_AIE;
 358
 359                err = rv8803_write_reg(rv8803->client, RV8803_CTRL,
 360                                       rv8803->ctrl);
 361                if (err)
 362                        return err;
 363        }
 364
 365        return 0;
 366}
 367
 368static int rv8803_alarm_irq_enable(struct device *dev, unsigned int enabled)
 369{
 370        struct i2c_client *client = to_i2c_client(dev);
 371        struct rv8803_data *rv8803 = dev_get_drvdata(dev);
 372        int ctrl, flags, err;
 373
 374        ctrl = rv8803->ctrl;
 375
 376        if (enabled) {
 377                if (rv8803->rtc->uie_rtctimer.enabled)
 378                        ctrl |= RV8803_CTRL_UIE;
 379                if (rv8803->rtc->aie_timer.enabled)
 380                        ctrl |= RV8803_CTRL_AIE;
 381        } else {
 382                if (!rv8803->rtc->uie_rtctimer.enabled)
 383                        ctrl &= ~RV8803_CTRL_UIE;
 384                if (!rv8803->rtc->aie_timer.enabled)
 385                        ctrl &= ~RV8803_CTRL_AIE;
 386        }
 387
 388        mutex_lock(&rv8803->flags_lock);
 389        flags = rv8803_read_reg(client, RV8803_FLAG);
 390        if (flags < 0) {
 391                mutex_unlock(&rv8803->flags_lock);
 392                return flags;
 393        }
 394        flags &= ~(RV8803_FLAG_AF | RV8803_FLAG_UF);
 395        err = rv8803_write_reg(client, RV8803_FLAG, flags);
 396        mutex_unlock(&rv8803->flags_lock);
 397        if (err)
 398                return err;
 399
 400        if (ctrl != rv8803->ctrl) {
 401                rv8803->ctrl = ctrl;
 402                err = rv8803_write_reg(client, RV8803_CTRL, rv8803->ctrl);
 403                if (err)
 404                        return err;
 405        }
 406
 407        return 0;
 408}
 409
 410static int rv8803_ioctl(struct device *dev, unsigned int cmd, unsigned long arg)
 411{
 412        struct i2c_client *client = to_i2c_client(dev);
 413        struct rv8803_data *rv8803 = dev_get_drvdata(dev);
 414        unsigned int vl = 0;
 415        int flags, ret = 0;
 416
 417        switch (cmd) {
 418        case RTC_VL_READ:
 419                flags = rv8803_read_reg(client, RV8803_FLAG);
 420                if (flags < 0)
 421                        return flags;
 422
 423                if (flags & RV8803_FLAG_V1F) {
 424                        dev_warn(&client->dev, "Voltage low, temperature compensation stopped.\n");
 425                        vl = RTC_VL_ACCURACY_LOW;
 426                }
 427
 428                if (flags & RV8803_FLAG_V2F)
 429                        vl |= RTC_VL_DATA_INVALID;
 430
 431                return put_user(vl, (unsigned int __user *)arg);
 432
 433        case RTC_VL_CLR:
 434                mutex_lock(&rv8803->flags_lock);
 435                flags = rv8803_read_reg(client, RV8803_FLAG);
 436                if (flags < 0) {
 437                        mutex_unlock(&rv8803->flags_lock);
 438                        return flags;
 439                }
 440
 441                flags &= ~RV8803_FLAG_V1F;
 442                ret = rv8803_write_reg(client, RV8803_FLAG, flags);
 443                mutex_unlock(&rv8803->flags_lock);
 444                if (ret)
 445                        return ret;
 446
 447                return 0;
 448
 449        default:
 450                return -ENOIOCTLCMD;
 451        }
 452}
 453
 454static int rv8803_nvram_write(void *priv, unsigned int offset, void *val,
 455                              size_t bytes)
 456{
 457        return rv8803_write_reg(priv, RV8803_RAM, *(u8 *)val);
 458}
 459
 460static int rv8803_nvram_read(void *priv, unsigned int offset,
 461                             void *val, size_t bytes)
 462{
 463        int ret;
 464
 465        ret = rv8803_read_reg(priv, RV8803_RAM);
 466        if (ret < 0)
 467                return ret;
 468
 469        *(u8 *)val = ret;
 470
 471        return 0;
 472}
 473
 474static const struct rtc_class_ops rv8803_rtc_ops = {
 475        .read_time = rv8803_get_time,
 476        .set_time = rv8803_set_time,
 477        .ioctl = rv8803_ioctl,
 478        .read_alarm = rv8803_get_alarm,
 479        .set_alarm = rv8803_set_alarm,
 480        .alarm_irq_enable = rv8803_alarm_irq_enable,
 481};
 482
 483static int rx8900_trickle_charger_init(struct rv8803_data *rv8803)
 484{
 485        struct i2c_client *client = rv8803->client;
 486        struct device_node *node = client->dev.of_node;
 487        int err;
 488        u8 flags;
 489
 490        if (!node)
 491                return 0;
 492
 493        if (rv8803->type != rx_8900)
 494                return 0;
 495
 496        err = i2c_smbus_read_byte_data(rv8803->client, RX8900_BACKUP_CTRL);
 497        if (err < 0)
 498                return err;
 499
 500        flags = ~(RX8900_FLAG_VDETOFF | RX8900_FLAG_SWOFF) & (u8)err;
 501
 502        if (of_property_read_bool(node, "epson,vdet-disable"))
 503                flags |= RX8900_FLAG_VDETOFF;
 504
 505        if (of_property_read_bool(node, "trickle-diode-disable"))
 506                flags |= RX8900_FLAG_SWOFF;
 507
 508        return i2c_smbus_write_byte_data(rv8803->client, RX8900_BACKUP_CTRL,
 509                                         flags);
 510}
 511
 512static int rv8803_probe(struct i2c_client *client,
 513                        const struct i2c_device_id *id)
 514{
 515        struct i2c_adapter *adapter = client->adapter;
 516        struct rv8803_data *rv8803;
 517        int err, flags;
 518        struct nvmem_config nvmem_cfg = {
 519                .name = "rv8803_nvram",
 520                .word_size = 1,
 521                .stride = 1,
 522                .size = 1,
 523                .reg_read = rv8803_nvram_read,
 524                .reg_write = rv8803_nvram_write,
 525                .priv = client,
 526        };
 527
 528        if (!i2c_check_functionality(adapter, I2C_FUNC_SMBUS_BYTE_DATA |
 529                                     I2C_FUNC_SMBUS_I2C_BLOCK)) {
 530                dev_err(&adapter->dev, "doesn't support I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_I2C_BLOCK\n");
 531                return -EIO;
 532        }
 533
 534        rv8803 = devm_kzalloc(&client->dev, sizeof(struct rv8803_data),
 535                              GFP_KERNEL);
 536        if (!rv8803)
 537                return -ENOMEM;
 538
 539        mutex_init(&rv8803->flags_lock);
 540        rv8803->client = client;
 541        if (client->dev.of_node)
 542                rv8803->type = (enum rv8803_type)
 543                        of_device_get_match_data(&client->dev);
 544        else
 545                rv8803->type = id->driver_data;
 546        i2c_set_clientdata(client, rv8803);
 547
 548        flags = rv8803_read_reg(client, RV8803_FLAG);
 549        if (flags < 0)
 550                return flags;
 551
 552        if (flags & RV8803_FLAG_V1F)
 553                dev_warn(&client->dev, "Voltage low, temperature compensation stopped.\n");
 554
 555        if (flags & RV8803_FLAG_V2F)
 556                dev_warn(&client->dev, "Voltage low, data loss detected.\n");
 557
 558        if (flags & RV8803_FLAG_AF)
 559                dev_warn(&client->dev, "An alarm maybe have been missed.\n");
 560
 561        rv8803->rtc = devm_rtc_allocate_device(&client->dev);
 562        if (IS_ERR(rv8803->rtc))
 563                return PTR_ERR(rv8803->rtc);
 564
 565        if (client->irq > 0) {
 566                err = devm_request_threaded_irq(&client->dev, client->irq,
 567                                                NULL, rv8803_handle_irq,
 568                                                IRQF_TRIGGER_LOW | IRQF_ONESHOT,
 569                                                "rv8803", client);
 570                if (err) {
 571                        dev_warn(&client->dev, "unable to request IRQ, alarms disabled\n");
 572                        client->irq = 0;
 573                }
 574        }
 575        if (!client->irq)
 576                clear_bit(RTC_FEATURE_ALARM, rv8803->rtc->features);
 577
 578        err = rv8803_write_reg(rv8803->client, RV8803_EXT, RV8803_EXT_WADA);
 579        if (err)
 580                return err;
 581
 582        err = rx8900_trickle_charger_init(rv8803);
 583        if (err) {
 584                dev_err(&client->dev, "failed to init charger\n");
 585                return err;
 586        }
 587
 588        rv8803->rtc->ops = &rv8803_rtc_ops;
 589        rv8803->rtc->range_min = RTC_TIMESTAMP_BEGIN_2000;
 590        rv8803->rtc->range_max = RTC_TIMESTAMP_END_2099;
 591        err = devm_rtc_register_device(rv8803->rtc);
 592        if (err)
 593                return err;
 594
 595        devm_rtc_nvmem_register(rv8803->rtc, &nvmem_cfg);
 596
 597        rv8803->rtc->max_user_freq = 1;
 598
 599        return 0;
 600}
 601
 602static const struct i2c_device_id rv8803_id[] = {
 603        { "rv8803", rv_8803 },
 604        { "rx8803", rv_8803 },
 605        { "rx8900", rx_8900 },
 606        { }
 607};
 608MODULE_DEVICE_TABLE(i2c, rv8803_id);
 609
 610static const __maybe_unused struct of_device_id rv8803_of_match[] = {
 611        {
 612                .compatible = "microcrystal,rv8803",
 613                .data = (void *)rv_8803
 614        },
 615        {
 616                .compatible = "epson,rx8803",
 617                .data = (void *)rv_8803
 618        },
 619        {
 620                .compatible = "epson,rx8900",
 621                .data = (void *)rx_8900
 622        },
 623        { }
 624};
 625MODULE_DEVICE_TABLE(of, rv8803_of_match);
 626
 627static struct i2c_driver rv8803_driver = {
 628        .driver = {
 629                .name = "rtc-rv8803",
 630                .of_match_table = of_match_ptr(rv8803_of_match),
 631        },
 632        .probe          = rv8803_probe,
 633        .id_table       = rv8803_id,
 634};
 635module_i2c_driver(rv8803_driver);
 636
 637MODULE_AUTHOR("Alexandre Belloni <alexandre.belloni@bootlin.com>");
 638MODULE_DESCRIPTION("Micro Crystal RV8803 RTC driver");
 639MODULE_LICENSE("GPL v2");
 640