linux-imx

/*

 * RTC driver for Maxim MAX8907

 *

 * Copyright (c) 2011-2012, NVIDIA Corporation.

 *

 * Based on drivers/rtc/rtc-max8925.c,

 * Copyright (C) 2009-2010 Marvell International Ltd.

 *

 * 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/bcd.h>

#include <linux/i2c.h>

#include <linux/mfd/max8907.h>

#include <linux/module.h>

#include <linux/platform_device.h>

#include <linux/regmap.h>

#include <linux/rtc.h>

#include <linux/slab.h>

​

enum {

    RTC_SEC = 0,

    RTC_MIN,

    RTC_HOUR,

    RTC_WEEKDAY,

    RTC_DATE,

    RTC_MONTH,

    RTC_YEAR1,

    RTC_YEAR2,

};

​

#define TIME_NUM            8

#define ALARM_1SEC          (1 << 7)

#define HOUR_12             (1 << 7)

#define HOUR_AM_PM          (1 << 5)

#define ALARM0_IRQ          (1 << 3)

#define ALARM1_IRQ          (1 << 2)

#define ALARM0_STATUS           (1 << 2)

#define ALARM1_STATUS           (1 << 1)

​

struct max8907_rtc {

    struct max8907      *max8907;

    struct regmap       *regmap;

    struct rtc_device   *rtc_dev;

    int         irq;

};

​

static irqreturn_t max8907_irq_handler(int irq, void *data)

{

    struct max8907_rtc *rtc = data;

​

    regmap_write(rtc->regmap, MAX8907_REG_ALARM0_CNTL, 0);

​

    rtc_update_irq(rtc->rtc_dev, 1, RTC_IRQF | RTC_AF);

​

    return IRQ_HANDLED;

}

​

static void regs_to_tm(u8 *regs, struct rtc_time *tm)

{

    tm->tm_year = bcd2bin(regs[RTC_YEAR2]) * 100 +