linux-imx

/*

 * Seiko Instruments S-35390A RTC Driver

 *

 * Copyright (c) 2007 Byron Bradley

 *

 * This program is free software; you can redistribute it and/or

 * modify it under the terms of the GNU General Public License

 * as published by the Free Software Foundation; either version

 * 2 of the License, or (at your option) any later version.

 */

​

#include <linux/module.h>

#include <linux/rtc.h>

#include <linux/i2c.h>

#include <linux/bitrev.h>

#include <linux/bcd.h>

#include <linux/slab.h>

#include <linux/delay.h>

​

#define S35390A_CMD_STATUS1 0

#define S35390A_CMD_STATUS2 1

#define S35390A_CMD_TIME1   2

#define S35390A_CMD_TIME2   3

#define S35390A_CMD_INT2_REG1   5

​

#define S35390A_BYTE_YEAR   0

#define S35390A_BYTE_MONTH  1

#define S35390A_BYTE_DAY    2

#define S35390A_BYTE_WDAY   3

#define S35390A_BYTE_HOURS  4

#define S35390A_BYTE_MINS   5

#define S35390A_BYTE_SECS   6

​

#define S35390A_ALRM_BYTE_WDAY  0

#define S35390A_ALRM_BYTE_HOURS 1

#define S35390A_ALRM_BYTE_MINS  2

​

/* flags for STATUS1 */

#define S35390A_FLAG_POC    0x01

#define S35390A_FLAG_BLD    0x02

#define S35390A_FLAG_INT2   0x04

#define S35390A_FLAG_24H    0x40

#define S35390A_FLAG_RESET  0x80

​

/* flag for STATUS2 */

#define S35390A_FLAG_TEST   0x01

​

#define S35390A_INT2_MODE_MASK      0xF0

​

#define S35390A_INT2_MODE_NOINTR    0x00

#define S35390A_INT2_MODE_FREQ      0x10

#define S35390A_INT2_MODE_ALARM     0x40

#define S35390A_INT2_MODE_PMIN_EDG  0x20

​

static const struct i2c_device_id s35390a_id[] = {

    { "s35390a", 0 },

    { }

};

MODULE_DEVICE_TABLE(i2c, s35390a_id);

​

static const struct of_device_id s35390a_of_match[] = {

    { .compatible = "s35390a" },

    { .compatible = "sii,s35390a" },

    { }

};

MODULE_DEVICE_TABLE(of, s35390a_of_match);

​

struct s35390a {

    struct i2c_client *client[8];

    struct rtc_device *rtc;

    int twentyfourhour;

};

​

static int s35390a_set_reg(struct s35390a *s35390a, int reg, char *buf, int len)

{

    struct i2c_client *client = s35390a->client[reg];

    struct i2c_msg msg[] = {

        {

            .addr = client->addr,

            .len = len,

            .buf = buf

        },

    };

​

    if ((i2c_transfer(client->adapter, msg, 1)) != 1)

        return -EIO;

​

    return 0;

}

​

static int s35390a_get_reg(struct s35390a *s35390a, int reg, char *buf, int len)

{