linux-imx

/*

 * An rtc/i2c driver for the EM Microelectronic EM3027

 * Copyright 2011 CompuLab, Ltd.

 *

 * Author: Mike Rapoport <mike@compulab.co.il>

 *

 * Based on rtc-ds1672.c by Alessandro Zummo <a.zummo@towertech.it>

 *

 * 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/module.h>

#include <linux/of.h>

​

/* Registers */

#define EM3027_REG_ON_OFF_CTRL  0x00

#define EM3027_REG_IRQ_CTRL 0x01

#define EM3027_REG_IRQ_FLAGS    0x02

#define EM3027_REG_STATUS   0x03

#define EM3027_REG_RST_CTRL 0x04

​

#define EM3027_REG_WATCH_SEC    0x08

#define EM3027_REG_WATCH_MIN    0x09

#define EM3027_REG_WATCH_HOUR   0x0a

#define EM3027_REG_WATCH_DATE   0x0b

#define EM3027_REG_WATCH_DAY    0x0c

#define EM3027_REG_WATCH_MON    0x0d

#define EM3027_REG_WATCH_YEAR   0x0e

​

#define EM3027_REG_ALARM_SEC    0x10

#define EM3027_REG_ALARM_MIN    0x11

#define EM3027_REG_ALARM_HOUR   0x12

#define EM3027_REG_ALARM_DATE   0x13

#define EM3027_REG_ALARM_DAY    0x14

#define EM3027_REG_ALARM_MON    0x15

#define EM3027_REG_ALARM_YEAR   0x16

​

static struct i2c_driver em3027_driver;

​

static int em3027_get_time(struct device *dev, struct rtc_time *tm)

{

    struct i2c_client *client = to_i2c_client(dev);

​

    unsigned char addr = EM3027_REG_WATCH_SEC;

    unsigned char buf[7];

​

    struct i2c_msg msgs[] = {

        {/* setup read addr */

            .addr = client->addr,

            .len = 1,

            .buf = &addr

        },

        {/* read time/date */

            .addr = client->addr,

            .flags = I2C_M_RD,

            .len = 7,

            .buf = buf

        },