linux-imx

/*

 * rtc-rc5t583.c -- RICOH RC5T583 Real Time Clock

 *

 * Copyright (c) 2012, NVIDIA CORPORATION.  All rights reserved.

 * Author: Venu Byravarasu <vbyravarasu@nvidia.com>

 *

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

 * under the terms and conditions of the GNU General Public License,

 * version 2, as published by the Free Software Foundation.

 *

 * This program is distributed in the hope it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for

 * more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program.  If not, see <http://www.gnu.org/licenses/>. */

​

#include <linux/kernel.h>

#include <linux/errno.h>

#include <linux/init.h>

#include <linux/module.h>

#include <linux/types.h>

#include <linux/rtc.h>

#include <linux/bcd.h>

#include <linux/platform_device.h>

#include <linux/interrupt.h>

#include <linux/mfd/rc5t583.h>

​

struct rc5t583_rtc {

    struct rtc_device   *rtc;

    /* To store the list of enabled interrupts, during system suspend */

    u32 irqen;

};

​

/* Total number of RTC registers needed to set time*/

#define NUM_TIME_REGS   (RC5T583_RTC_YEAR - RC5T583_RTC_SEC + 1)

​

/* Total number of RTC registers needed to set Y-Alarm*/

#define NUM_YAL_REGS    (RC5T583_RTC_AY_YEAR - RC5T583_RTC_AY_MIN + 1)

​

/* Set Y-Alarm interrupt */

#define SET_YAL BIT(5)

​

/* Get Y-Alarm interrupt status*/

#define GET_YAL_STATUS BIT(3)

​

static int rc5t583_rtc_alarm_irq_enable(struct device *dev, unsigned enabled)

{

    struct rc5t583 *rc5t583 = dev_get_drvdata(dev->parent);

    u8 val;

​

    /* Set Y-Alarm, based on 'enabled' */

    val = enabled ? SET_YAL : 0;

​

    return regmap_update_bits(rc5t583->regmap, RC5T583_RTC_CTL1, SET_YAL,

        val);

}

​

/*

 * Gets current rc5t583 RTC time and date parameters.

 *

 * The RTC's time/alarm representation is not what gmtime(3) requires