linux-imx

/*

 * Real time clock driver for DA9052

 *

 * Copyright(c) 2012 Dialog Semiconductor Ltd.

 *

 * Author: Dajun Dajun Chen <dajun.chen@diasemi.com>

 *

 * 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/platform_device.h>

#include <linux/rtc.h>

#include <linux/err.h>

#include <linux/delay.h>

​

#include <linux/mfd/da9052/da9052.h>

#include <linux/mfd/da9052/reg.h>

​

#define rtc_err(rtc, fmt, ...) \

        dev_err(rtc->da9052->dev, "%s: " fmt, __func__, ##__VA_ARGS__)

​

#define DA9052_GET_TIME_RETRIES 5

​

struct da9052_rtc {

    struct rtc_device *rtc;

    struct da9052 *da9052;

};

​

static int da9052_rtc_enable_alarm(struct da9052_rtc *rtc, bool enable)

{

    int ret;

    if (enable) {

        ret = da9052_reg_update(rtc->da9052, DA9052_ALARM_Y_REG,

                DA9052_ALARM_Y_ALARM_ON|DA9052_ALARM_Y_TICK_ON,

                DA9052_ALARM_Y_ALARM_ON);

        if (ret != 0)

            rtc_err(rtc, "Failed to enable ALM: %d\n", ret);

    } else {

        ret = da9052_reg_update(rtc->da9052, DA9052_ALARM_Y_REG,

            DA9052_ALARM_Y_ALARM_ON|DA9052_ALARM_Y_TICK_ON, 0);

        if (ret != 0)

            rtc_err(rtc, "Write error: %d\n", ret);

    }

    return ret;

}

​

static irqreturn_t da9052_rtc_irq(int irq, void *data)

{

    struct da9052_rtc *rtc = data;

​

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

​

    return IRQ_HANDLED;

}

​

static int da9052_read_alarm(struct da9052_rtc *rtc, struct rtc_time *rtc_tm)

{

    int ret;