rtc-rs5c372.c

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/*
 * An I2C driver for Ricoh RS5C372, R2025S/D and RV5C38[67] RTCs
 *
 * Copyright (C) 2005 Pavel Mironchik <[email protected]>
 * Copyright (C) 2006 Tower Technologies
 * Copyright (C) 2008 Paul Mundt
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/i2c.h>
#include <linux/rtc.h>
#include <linux/bcd.h>
#include <linux/slab.h>
#include <linux/module.h>

#define DRV_VERSION "0.6"


/*
 * Ricoh has a family of I2C based RTCs, which differ only slightly from
 * each other.  Differences center on pinout (e.g. how many interrupts,
 * output clock, etc) and how the control registers are used.  The '372
 * is significant only because that's the one this driver first supported.
 */
#define RS5C372_REG_SECS    0
#define RS5C372_REG_MINS    1
#define RS5C372_REG_HOURS   2
#define RS5C372_REG_WDAY    3
#define RS5C372_REG_DAY     4
#define RS5C372_REG_MONTH   5
#define RS5C372_REG_YEAR    6
#define RS5C372_REG_TRIM    7
#   define RS5C372_TRIM_XSL     0x80
#   define RS5C372_TRIM_MASK    0x7F

#define RS5C_REG_ALARM_A_MIN    8           /* or ALARM_W */
#define RS5C_REG_ALARM_A_HOURS  9
#define RS5C_REG_ALARM_A_WDAY   10

#define RS5C_REG_ALARM_B_MIN    11          /* or ALARM_D */
#define RS5C_REG_ALARM_B_HOURS  12
#define RS5C_REG_ALARM_B_WDAY   13          /* (ALARM_B only) */

#define RS5C_REG_CTRL1      14
#   define RS5C_CTRL1_AALE      (1 << 7)    /* or WALE */
#   define RS5C_CTRL1_BALE      (1 << 6)    /* or DALE */
#   define RV5C387_CTRL1_24     (1 << 5)
#   define RS5C372A_CTRL1_SL1   (1 << 5)
#   define RS5C_CTRL1_CT_MASK   (7 << 0)
#   define RS5C_CTRL1_CT0       (0 << 0)    /* no periodic irq */
#   define RS5C_CTRL1_CT4       (4 << 0)    /* 1 Hz level irq */
#define RS5C_REG_CTRL2      15
#   define RS5C372_CTRL2_24     (1 << 5)
#   define R2025_CTRL2_XST      (1 << 5)
#   define RS5C_CTRL2_XSTP      (1 << 4)    /* only if !R2025S/D */
#   define RS5C_CTRL2_CTFG      (1 << 2)
#   define RS5C_CTRL2_AAFG      (1 << 1)    /* or WAFG */
#   define RS5C_CTRL2_BAFG      (1 << 0)    /* or DAFG */


/* to read (style 1) or write registers starting at R */
#define RS5C_ADDR(R)        (((R) << 4) | 0)


enum rtc_type {
    rtc_undef = 0,
    rtc_r2025sd,
    rtc_rs5c372a,
    rtc_rs5c372b,
    rtc_rv5c386,
    rtc_rv5c387a,
};

static const struct i2c_device_id rs5c372_id[] = {
    { "r2025sd", rtc_r2025sd },
    { "rs5c372a", rtc_rs5c372a },
    { "rs5c372b", rtc_rs5c372b },
    { "rv5c386", rtc_rv5c386 },
    { "rv5c387a", rtc_rv5c387a },
    { }
};
MODULE_DEVICE_TABLE(i2c, rs5c372_id);

/* REVISIT:  this assumes that:
 *  - we're in the 21st century, so it's safe to ignore the century
 *    bit for rv5c38[67] (REG_MONTH bit 7);
 *  - we should use ALARM_A not ALARM_B (may be wrong on some boards)
 */
struct rs5c372 {
    struct i2c_client   *client;
    struct rtc_device   *rtc;
    enum rtc_type       type;
    unsigned        time24:1;
    unsigned        has_irq:1;
    unsigned        smbus:1;
    char            buf[17];
    char            *regs;
};

static int rs5c_get_regs(struct rs5c372 *rs5c)
{
    struct i2c_client   *client = rs5c->client;
    struct i2c_msg      msgs[] = {
        {
            .addr = client->addr,
            .flags = I2C_M_RD,
            .len = sizeof(rs5c->buf),
            .buf = rs5c->buf
        },
    };

    /* This implements the third reading method from the datasheet, using
     * an internal address that's reset after each transaction (by STOP)
     * to 0x0f ... so we read extra registers, and skip the first one.
     *
     * The first method doesn't work with the iop3xx adapter driver, on at
     * least 80219 chips; this works around that bug.
     *
     * The third method on the other hand doesn't work for the SMBus-only
     * configurations, so we use the the first method there, stripping off
     * the extra register in the process.
     */
    if (rs5c->smbus) {
        int addr = RS5C_ADDR(RS5C372_REG_SECS);
        int size = sizeof(rs5c->buf) - 1;

        if (i2c_smbus_read_i2c_block_data(client, addr, size,
                          rs5c->buf + 1) != size) {
            dev_warn(&client->dev, "can't read registers\n");
            return -EIO;
        }
    } else {
        if ((i2c_transfer(client->adapter, msgs, 1)) != 1) {
            dev_warn(&client->dev, "can't read registers\n");
            return -EIO;
        }
    }

    dev_dbg(&client->dev,
        "%02x %02x %02x (%02x) %02x %02x %02x (%02x), "
        "%02x %02x %02x, %02x %02x %02x; %02x %02x\n",
        rs5c->regs[0],  rs5c->regs[1],  rs5c->regs[2],  rs5c->regs[3],
        rs5c->regs[4],  rs5c->regs[5],  rs5c->regs[6],  rs5c->regs[7],
        rs5c->regs[8],  rs5c->regs[9],  rs5c->regs[10], rs5c->regs[11],
        rs5c->regs[12], rs5c->regs[13], rs5c->regs[14], rs5c->regs[15]);

    return 0;
}

static unsigned rs5c_reg2hr(struct rs5c372 *rs5c, unsigned reg)
{
    unsigned    hour;

    if (rs5c->time24)
        return bcd2bin(reg & 0x3f);

    hour = bcd2bin(reg & 0x1f);
    if (hour == 12)
        hour = 0;
    if (reg & 0x20)
        hour += 12;
    return hour;
}

static unsigned rs5c_hr2reg(struct rs5c372 *rs5c, unsigned hour)
{
    if (rs5c->time24)
        return bin2bcd(hour);

    if (hour > 12)
        return 0x20 | bin2bcd(hour - 12);
    if (hour == 12)
        return 0x20 | bin2bcd(12);
    if (hour == 0)
        return bin2bcd(12);
    return bin2bcd(hour);
}

static int rs5c372_get_datetime(struct i2c_client *client, struct rtc_time *tm)
{
    struct rs5c372  *rs5c = i2c_get_clientdata(client);
    int     status = rs5c_get_regs(rs5c);

    if (status < 0)
        return status;

    tm->tm_sec = bcd2bin(rs5c->regs[RS5C372_REG_SECS] & 0x7f);
    tm->tm_min = bcd2bin(rs5c->regs[RS5C372_REG_MINS] & 0x7f);
    tm->tm_hour = rs5c_reg2hr(rs5c, rs5c->regs[RS5C372_REG_HOURS]);

    tm->tm_wday = bcd2bin(rs5c->regs[RS5C372_REG_WDAY] & 0x07);
    tm->tm_mday = bcd2bin(rs5c->regs[RS5C372_REG_DAY] & 0x3f);

    /* tm->tm_mon is zero-based */
    tm->tm_mon = bcd2bin(rs5c->regs[RS5C372_REG_MONTH] & 0x1f) - 1;

    /* year is 1900 + tm->tm_year */
    tm->tm_year = bcd2bin(rs5c->regs[RS5C372_REG_YEAR]) + 100;

    dev_dbg(&client->dev, "%s: tm is secs=%d, mins=%d, hours=%d, "
        "mday=%d, mon=%d, year=%d, wday=%d\n",
        __func__,
        tm->tm_sec, tm->tm_min, tm->tm_hour,
        tm->tm_mday, tm->tm_mon, tm->tm_year, tm->tm_wday);

    /* rtc might need initialization */
    return rtc_valid_tm(tm);
}

static int rs5c372_set_datetime(struct i2c_client *client, struct rtc_time *tm)
{
    struct rs5c372  *rs5c = i2c_get_clientdata(client);
    unsigned char   buf[7];
    int     addr;

    dev_dbg(&client->dev, "%s: tm is secs=%d, mins=%d, hours=%d "
        "mday=%d, mon=%d, year=%d, wday=%d\n",
        __func__,
        tm->tm_sec, tm->tm_min, tm->tm_hour,
        tm->tm_mday, tm->tm_mon, tm->tm_year, tm->tm_wday);

    addr   = RS5C_ADDR(RS5C372_REG_SECS);
    buf[0] = bin2bcd(tm->tm_sec);
    buf[1] = bin2bcd(tm->tm_min);
    buf[2] = rs5c_hr2reg(rs5c, tm->tm_hour);
    buf[3] = bin2bcd(tm->tm_wday);
    buf[4] = bin2bcd(tm->tm_mday);
    buf[5] = bin2bcd(tm->tm_mon + 1);
    buf[6] = bin2bcd(tm->tm_year - 100);

    if (i2c_smbus_write_i2c_block_data(client, addr, sizeof(buf), buf) < 0) {
        dev_err(&client->dev, "%s: write error\n", __func__);
        return -EIO;
    }

    return 0;
}

#if defined(CONFIG_RTC_INTF_PROC) || defined(CONFIG_RTC_INTF_PROC_MODULE)
#define NEED_TRIM
#endif

#if defined(CONFIG_RTC_INTF_SYSFS) || defined(CONFIG_RTC_INTF_SYSFS_MODULE)
#define NEED_TRIM
#endif

#ifdef  NEED_TRIM
static int rs5c372_get_trim(struct i2c_client *client, int *osc, int *trim)
{
    struct rs5c372 *rs5c372 = i2c_get_clientdata(client);
    u8 tmp = rs5c372->regs[RS5C372_REG_TRIM];

    if (osc)
        *osc = (tmp & RS5C372_TRIM_XSL) ? 32000 : 32768;

    if (trim) {
        dev_dbg(&client->dev, "%s: raw trim=%x\n", __func__, tmp);
        tmp &= RS5C372_TRIM_MASK;
        if (tmp & 0x3e) {
            int t = tmp & 0x3f;

            if (tmp & 0x40)
                t = (~t | (s8)0xc0) + 1;
            else
                t = t - 1;

            tmp = t * 2;
        } else
            tmp = 0;
        *trim = tmp;
    }

    return 0;
}
#endif

static int rs5c372_rtc_read_time(struct device *dev, struct rtc_time *tm)
{
    return rs5c372_get_datetime(to_i2c_client(dev), tm);
}

static int rs5c372_rtc_set_time(struct device *dev, struct rtc_time *tm)
{
    return rs5c372_set_datetime(to_i2c_client(dev), tm);
}


static int rs5c_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled)
{
    struct i2c_client   *client = to_i2c_client(dev);
    struct rs5c372      *rs5c = i2c_get_clientdata(client);
    unsigned char       buf;
    int         status, addr;

    buf = rs5c->regs[RS5C_REG_CTRL1];

    if (!rs5c->has_irq)
        return -EINVAL;

    status = rs5c_get_regs(rs5c);
    if (status < 0)
        return status;

    addr = RS5C_ADDR(RS5C_REG_CTRL1);
    if (enabled)
        buf |= RS5C_CTRL1_AALE;
    else
        buf &= ~RS5C_CTRL1_AALE;

    if (i2c_smbus_write_byte_data(client, addr, buf) < 0) {
        printk(KERN_WARNING "%s: can't update alarm\n",
            rs5c->rtc->name);
        status = -EIO;
    } else
        rs5c->regs[RS5C_REG_CTRL1] = buf;

    return status;
}


/* NOTE:  Since RTC_WKALM_{RD,SET} were originally defined for EFI,
 * which only exposes a polled programming interface; and since
 * these calls map directly to those EFI requests; we don't demand
 * we have an IRQ for this chip when we go through this API.
 *
 * The older x86_pc derived RTC_ALM_{READ,SET} calls require irqs
 * though, managed through RTC_AIE_{ON,OFF} requests.
 */

static int rs5c_read_alarm(struct device *dev, struct rtc_wkalrm *t)
{
    struct i2c_client   *client = to_i2c_client(dev);
    struct rs5c372      *rs5c = i2c_get_clientdata(client);
    int         status;

    status = rs5c_get_regs(rs5c);
    if (status < 0)
        return status;

    /* report alarm time */
    t->time.tm_sec = 0;
    t->time.tm_min = bcd2bin(rs5c->regs[RS5C_REG_ALARM_A_MIN] & 0x7f);
    t->time.tm_hour = rs5c_reg2hr(rs5c, rs5c->regs[RS5C_REG_ALARM_A_HOURS]);
    t->time.tm_mday = -1;
    t->time.tm_mon = -1;
    t->time.tm_year = -1;
    t->time.tm_wday = -1;
    t->time.tm_yday = -1;
    t->time.tm_isdst = -1;

    /* ... and status */
    t->enabled = !!(rs5c->regs[RS5C_REG_CTRL1] & RS5C_CTRL1_AALE);
    t->pending = !!(rs5c->regs[RS5C_REG_CTRL2] & RS5C_CTRL2_AAFG);

    return 0;
}

static int rs5c_set_alarm(struct device *dev, struct rtc_wkalrm *t)
{
    struct i2c_client   *client = to_i2c_client(dev);
    struct rs5c372      *rs5c = i2c_get_clientdata(client);
    int         status, addr, i;
    unsigned char       buf[3];

    /* only handle up to 24 hours in the future, like RTC_ALM_SET */
    if (t->time.tm_mday != -1
            || t->time.tm_mon != -1
            || t->time.tm_year != -1)
        return -EINVAL;

    /* REVISIT: round up tm_sec */

    /* if needed, disable irq (clears pending status) */
    status = rs5c_get_regs(rs5c);
    if (status < 0)
        return status;
    if (rs5c->regs[RS5C_REG_CTRL1] & RS5C_CTRL1_AALE) {
        addr = RS5C_ADDR(RS5C_REG_CTRL1);
        buf[0] = rs5c->regs[RS5C_REG_CTRL1] & ~RS5C_CTRL1_AALE;
        if (i2c_smbus_write_byte_data(client, addr, buf[0]) < 0) {
            pr_debug("%s: can't disable alarm\n", rs5c->rtc->name);
            return -EIO;
        }
        rs5c->regs[RS5C_REG_CTRL1] = buf[0];
    }

    /* set alarm */
    buf[0] = bin2bcd(t->time.tm_min);
    buf[1] = rs5c_hr2reg(rs5c, t->time.tm_hour);
    buf[2] = 0x7f;  /* any/all days */

    for (i = 0; i < sizeof(buf); i++) {
        addr = RS5C_ADDR(RS5C_REG_ALARM_A_MIN + i);
        if (i2c_smbus_write_byte_data(client, addr, buf[i]) < 0) {
            pr_debug("%s: can't set alarm time\n", rs5c->rtc->name);
            return -EIO;
        }
    }

    /* ... and maybe enable its irq */
    if (t->enabled) {
        addr = RS5C_ADDR(RS5C_REG_CTRL1);
        buf[0] = rs5c->regs[RS5C_REG_CTRL1] | RS5C_CTRL1_AALE;
        if (i2c_smbus_write_byte_data(client, addr, buf[0]) < 0)
            printk(KERN_WARNING "%s: can't enable alarm\n",
                rs5c->rtc->name);
        rs5c->regs[RS5C_REG_CTRL1] = buf[0];
    }

    return 0;
}

#if defined(CONFIG_RTC_INTF_PROC) || defined(CONFIG_RTC_INTF_PROC_MODULE)

static int rs5c372_rtc_proc(struct device *dev, struct seq_file *seq)
{
    int err, osc, trim;

    err = rs5c372_get_trim(to_i2c_client(dev), &osc, &trim);
    if (err == 0) {
        seq_printf(seq, "crystal\t\t: %d.%03d KHz\n",
                osc / 1000, osc % 1000);
        seq_printf(seq, "trim\t\t: %d\n", trim);
    }

    return 0;
}

#else
#define rs5c372_rtc_proc    NULL
#endif

static const struct rtc_class_ops rs5c372_rtc_ops = {
    .proc       = rs5c372_rtc_proc,
    .read_time  = rs5c372_rtc_read_time,
    .set_time   = rs5c372_rtc_set_time,
    .read_alarm = rs5c_read_alarm,
    .set_alarm  = rs5c_set_alarm,
    .alarm_irq_enable = rs5c_rtc_alarm_irq_enable,
};

#if defined(CONFIG_RTC_INTF_SYSFS) || defined(CONFIG_RTC_INTF_SYSFS_MODULE)

static ssize_t rs5c372_sysfs_show_trim(struct device *dev,
                struct device_attribute *attr, char *buf)
{
    int err, trim;

    err = rs5c372_get_trim(to_i2c_client(dev), NULL, &trim);
    if (err)
        return err;

    return sprintf(buf, "%d\n", trim);
}
static DEVICE_ATTR(trim, S_IRUGO, rs5c372_sysfs_show_trim, NULL);

static ssize_t rs5c372_sysfs_show_osc(struct device *dev,
                struct device_attribute *attr, char *buf)
{
    int err, osc;

    err = rs5c372_get_trim(to_i2c_client(dev), &osc, NULL);
    if (err)
        return err;

    return sprintf(buf, "%d.%03d KHz\n", osc / 1000, osc % 1000);
}
static DEVICE_ATTR(osc, S_IRUGO, rs5c372_sysfs_show_osc, NULL);

static int rs5c_sysfs_register(struct device *dev)
{
    int err;

    err = device_create_file(dev, &dev_attr_trim);
    if (err)
        return err;
    err = device_create_file(dev, &dev_attr_osc);
    if (err)
        device_remove_file(dev, &dev_attr_trim);

    return err;
}

static void rs5c_sysfs_unregister(struct device *dev)
{
    device_remove_file(dev, &dev_attr_trim);
    device_remove_file(dev, &dev_attr_osc);
}

#else
static int rs5c_sysfs_register(struct device *dev)
{
    return 0;
}

static void rs5c_sysfs_unregister(struct device *dev)
{
    /* nothing */
}
#endif  /* SYSFS */

static struct i2c_driver rs5c372_driver;

static int rs5c_oscillator_setup(struct rs5c372 *rs5c372)
{
    unsigned char buf[2];
    int addr, i, ret = 0;

    if (rs5c372->type == rtc_r2025sd) {
        if (!(rs5c372->regs[RS5C_REG_CTRL2] & R2025_CTRL2_XST))
            return ret;
        rs5c372->regs[RS5C_REG_CTRL2] &= ~R2025_CTRL2_XST;
    } else {
        if (!(rs5c372->regs[RS5C_REG_CTRL2] & RS5C_CTRL2_XSTP))
            return ret;
        rs5c372->regs[RS5C_REG_CTRL2] &= ~RS5C_CTRL2_XSTP;
    }

    addr   = RS5C_ADDR(RS5C_REG_CTRL1);
    buf[0] = rs5c372->regs[RS5C_REG_CTRL1];
    buf[1] = rs5c372->regs[RS5C_REG_CTRL2];

    /* use 24hr mode */
    switch (rs5c372->type) {
    case rtc_rs5c372a:
    case rtc_rs5c372b:
        buf[1] |= RS5C372_CTRL2_24;
        rs5c372->time24 = 1;
        break;
    case rtc_r2025sd:
    case rtc_rv5c386:
    case rtc_rv5c387a:
        buf[0] |= RV5C387_CTRL1_24;
        rs5c372->time24 = 1;
        break;
    default:
        /* impossible */
        break;
    }

    for (i = 0; i < sizeof(buf); i++) {
        addr = RS5C_ADDR(RS5C_REG_CTRL1 + i);
        ret = i2c_smbus_write_byte_data(rs5c372->client, addr, buf[i]);
        if (unlikely(ret < 0))
            return ret;
    }

    rs5c372->regs[RS5C_REG_CTRL1] = buf[0];
    rs5c372->regs[RS5C_REG_CTRL2] = buf[1];

    return 0;
}

static int rs5c372_probe(struct i2c_client *client,
             const struct i2c_device_id *id)
{
    int err = 0;
    int smbus_mode = 0;
    struct rs5c372 *rs5c372;
    struct rtc_time tm;

    dev_dbg(&client->dev, "%s\n", __func__);

    if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C |
            I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_I2C_BLOCK)) {
        /*
         * If we don't have any master mode adapter, try breaking
         * it down in to the barest of capabilities.
         */
        if (i2c_check_functionality(client->adapter,
                I2C_FUNC_SMBUS_BYTE_DATA |
                I2C_FUNC_SMBUS_I2C_BLOCK))
            smbus_mode = 1;
        else {
            /* Still no good, give up */
            err = -ENODEV;
            goto exit;
        }
    }

    if (!(rs5c372 = kzalloc(sizeof(struct rs5c372), GFP_KERNEL))) {
        err = -ENOMEM;
        goto exit;
    }

    rs5c372->client = client;
    i2c_set_clientdata(client, rs5c372);
    rs5c372->type = id->driver_data;

    /* we read registers 0x0f then 0x00-0x0f; skip the first one */
    rs5c372->regs = &rs5c372->buf[1];
    rs5c372->smbus = smbus_mode;

    err = rs5c_get_regs(rs5c372);
    if (err < 0)
        goto exit_kfree;

    /* clock may be set for am/pm or 24 hr time */
    switch (rs5c372->type) {
    case rtc_rs5c372a:
    case rtc_rs5c372b:
        /* alarm uses ALARM_A; and nINTRA on 372a, nINTR on 372b.
         * so does periodic irq, except some 327a modes.
         */
        if (rs5c372->regs[RS5C_REG_CTRL2] & RS5C372_CTRL2_24)
            rs5c372->time24 = 1;
        break;
    case rtc_r2025sd:
    case rtc_rv5c386:
    case rtc_rv5c387a:
        if (rs5c372->regs[RS5C_REG_CTRL1] & RV5C387_CTRL1_24)
            rs5c372->time24 = 1;
        /* alarm uses ALARM_W; and nINTRB for alarm and periodic
         * irq, on both 386 and 387
         */
        break;
    default:
        dev_err(&client->dev, "unknown RTC type\n");
        goto exit_kfree;
    }

    /* if the oscillator lost power and no other software (like
     * the bootloader) set it up, do it here.
     *
     * The R2025S/D does this a little differently than the other
     * parts, so we special case that..
     */
    err = rs5c_oscillator_setup(rs5c372);
    if (unlikely(err < 0)) {
        dev_err(&client->dev, "setup error\n");
        goto exit_kfree;
    }

    if (rs5c372_get_datetime(client, &tm) < 0)
        dev_warn(&client->dev, "clock needs to be set\n");

    dev_info(&client->dev, "%s found, %s, driver version " DRV_VERSION "\n",
            ({ char *s; switch (rs5c372->type) {
            case rtc_r2025sd:   s = "r2025sd"; break;
            case rtc_rs5c372a:  s = "rs5c372a"; break;
            case rtc_rs5c372b:  s = "rs5c372b"; break;
            case rtc_rv5c386:   s = "rv5c386"; break;
            case rtc_rv5c387a:  s = "rv5c387a"; break;
            default:        s = "chip"; break;
            }; s;}),
            rs5c372->time24 ? "24hr" : "am/pm"
            );

    /* REVISIT use client->irq to register alarm irq ... */

    rs5c372->rtc = rtc_device_register(rs5c372_driver.driver.name,
                &client->dev, &rs5c372_rtc_ops, THIS_MODULE);

    if (IS_ERR(rs5c372->rtc)) {
        err = PTR_ERR(rs5c372->rtc);
        goto exit_kfree;
    }

    err = rs5c_sysfs_register(&client->dev);
    if (err)
        goto exit_devreg;

    return 0;

exit_devreg:
    rtc_device_unregister(rs5c372->rtc);

exit_kfree:
    kfree(rs5c372);

exit:
    return err;
}

static int rs5c372_remove(struct i2c_client *client)
{
    struct rs5c372 *rs5c372 = i2c_get_clientdata(client);

    rtc_device_unregister(rs5c372->rtc);
    rs5c_sysfs_unregister(&client->dev);
    kfree(rs5c372);
    return 0;
}

static struct i2c_driver rs5c372_driver = {
    .driver     = {
        .name   = "rtc-rs5c372",
    },
    .probe      = rs5c372_probe,
    .remove     = rs5c372_remove,
    .id_table   = rs5c372_id,
};

module_i2c_driver(rs5c372_driver);

MODULE_AUTHOR(
        "Pavel Mironchik <[email protected]>, "
        "Alessandro Zummo <[email protected]>, "
        "Paul Mundt <[email protected]>");
MODULE_DESCRIPTION("Ricoh RS5C372 RTC driver");
MODULE_LICENSE("GPL");
MODULE_VERSION(DRV_VERSION);