linux-imx

/*

 * rtc-tps80031.c -- TI TPS80031/TPS80032 RTC driver

 *

 * RTC driver for TI TPS80031/TPS80032 Fully Integrated

 * Power Management with Power Path and Battery Charger

 *

 * Copyright (c) 2012, NVIDIA Corporation.

 *

 * 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 version 2.

 *

 * This program is distributed "as is" WITHOUT ANY WARRANTY of any kind,

 * whether express or implied; 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, write to the Free Software

 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA

 * 02111-1307, USA

 */

​

#include <linux/bcd.h>

#include <linux/device.h>

#include <linux/err.h>

#include <linux/init.h>

#include <linux/kernel.h>

#include <linux/module.h>

#include <linux/mfd/tps80031.h>

#include <linux/platform_device.h>

#include <linux/pm.h>

#include <linux/rtc.h>

#include <linux/slab.h>

​

#define ENABLE_ALARM_INT            0x08

#define ALARM_INT_STATUS            0x40

​

/**

 * Setting bit to 1 in STOP_RTC will run the RTC and

 * setting this bit to 0 will freeze RTC.

 */

#define STOP_RTC                0x1

​

/* Power on reset Values of RTC registers */

#define TPS80031_RTC_POR_YEAR           0

#define TPS80031_RTC_POR_MONTH          1

#define TPS80031_RTC_POR_DAY            1

​

/* Numbers of registers for time and alarms */

#define TPS80031_RTC_TIME_NUM_REGS      7

#define TPS80031_RTC_ALARM_NUM_REGS     6

​

/**

 * PMU RTC have only 2 nibbles to store year information, so using an

 * offset of 100 to set the base year as 2000 for our driver.

 */

#define RTC_YEAR_OFFSET 100

​

struct tps80031_rtc {

    struct rtc_device   *rtc;

    int         irq;

};

​

static int tps80031_rtc_read_time(struct device *dev, struct rtc_time *tm)

{

    u8 buff[TPS80031_RTC_TIME_NUM_REGS];

    int ret;

​

    ret = tps80031_reads(dev->parent, TPS80031_SLAVE_ID1,

            TPS80031_SECONDS_REG, TPS80031_RTC_TIME_NUM_REGS, buff);

    if (ret < 0) {

        dev_err(dev, "reading RTC_SECONDS_REG failed, err = %d\n", ret);

        return ret;

    }

​

    tm->tm_sec = bcd2bin(buff[0]);

    tm->tm_min = bcd2bin(buff[1]);

    tm->tm_hour = bcd2bin(buff[2]);

    tm->tm_mday = bcd2bin(buff[3]);

    tm->tm_mon = bcd2bin(buff[4]) - 1;

    tm->tm_year = bcd2bin(buff[5]) + RTC_YEAR_OFFSET;

    tm->tm_wday = bcd2bin(buff[6]);

    return 0;

}

​

static int tps80031_rtc_set_time(struct device *dev, struct rtc_time *tm)

{

    u8 buff[7];

    int ret;