linux-imx

/*

 * rtc-as3722.c - Real Time Clock driver for ams AS3722 PMICs

 *

 * Copyright (C) 2013 ams AG

 * Copyright (c) 2013, NVIDIA Corporation. All rights reserved.

 *

 * Author: Florian Lobmaier <florian.lobmaier@ams.com>

 * Author: Laxman Dewangan <ldewangan@nvidia.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.

 *

 * This program is distributed in the hope that 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.

 */

​

#include <linux/bcd.h>

#include <linux/completion.h>

#include <linux/delay.h>

#include <linux/interrupt.h>

#include <linux/ioctl.h>

#include <linux/kernel.h>

#include <linux/module.h>

#include <linux/mfd/as3722.h>

#include <linux/platform_device.h>

#include <linux/rtc.h>

#include <linux/time.h>

​

#define AS3722_RTC_START_YEAR     2000

struct as3722_rtc {

    struct rtc_device   *rtc;

    struct device       *dev;

    struct as3722       *as3722;

    int         alarm_irq;

    bool            irq_enable;

};

​

static void as3722_time_to_reg(u8 *rbuff, struct rtc_time *tm)

{

    rbuff[0] = bin2bcd(tm->tm_sec);

    rbuff[1] = bin2bcd(tm->tm_min);

    rbuff[2] = bin2bcd(tm->tm_hour);

    rbuff[3] = bin2bcd(tm->tm_mday);

    rbuff[4] = bin2bcd(tm->tm_mon + 1);

    rbuff[5] = bin2bcd(tm->tm_year - (AS3722_RTC_START_YEAR - 1900));

}

​

static void as3722_reg_to_time(u8 *rbuff, struct rtc_time *tm)

{

    tm->tm_sec = bcd2bin(rbuff[0] & 0x7F);

    tm->tm_min = bcd2bin(rbuff[1] & 0x7F);

    tm->tm_hour = bcd2bin(rbuff[2] & 0x3F);

    tm->tm_mday = bcd2bin(rbuff[3] & 0x3F);

    tm->tm_mon = bcd2bin(rbuff[4] & 0x1F) - 1;

    tm->tm_year = (AS3722_RTC_START_YEAR - 1900) + bcd2bin(rbuff[5] & 0x7F);

    return;

}

​

static int as3722_rtc_read_time(struct device *dev, struct rtc_time *tm)