linux-imx

/*

 * An rtc driver for the Dallas/Maxim DS1685/DS1687 and related real-time

 * chips.

 *

 * Copyright (C) 2011-2014 Joshua Kinard <kumba@gentoo.org>.

 * Copyright (C) 2009 Matthias Fuchs <matthias.fuchs@esd-electronics.com>.

 *

 * References:

 *    DS1685/DS1687 3V/5V Real-Time Clocks, 19-5215, Rev 4/10.

 *    DS17x85/DS17x87 3V/5V Real-Time Clocks, 19-5222, Rev 4/10.

 *    DS1689/DS1693 3V/5V Serialized Real-Time Clocks, Rev 112105.

 *    Application Note 90, Using the Multiplex Bus RTC Extended Features.

 *

 * 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.

 */

​

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

​

#include <linux/bcd.h>

#include <linux/delay.h>

#include <linux/io.h>

#include <linux/module.h>

#include <linux/platform_device.h>

#include <linux/rtc.h>

#include <linux/workqueue.h>

​

#include <linux/rtc/ds1685.h>

​

#ifdef CONFIG_PROC_FS

#include <linux/proc_fs.h>

#endif

​

​

/* ----------------------------------------------------------------------- */

/* Standard read/write functions if platform does not provide overrides */

​

/**

 * ds1685_read - read a value from an rtc register.

 * @rtc: pointer to the ds1685 rtc structure.

 * @reg: the register address to read.

 */

static u8

ds1685_read(struct ds1685_priv *rtc, int reg)

{

    return readb((u8 __iomem *)rtc->regs +

             (reg * rtc->regstep));

}

​

/**

 * ds1685_write - write a value to an rtc register.

 * @rtc: pointer to the ds1685 rtc structure.

 * @reg: the register address to write.

 * @value: value to write to the register.

 */

static void

ds1685_write(struct ds1685_priv *rtc, int reg, u8 value)

{

    writeb(value, ((u8 __iomem *)rtc->regs +

               (reg * rtc->regstep)));

}

/* ----------------------------------------------------------------------- */