/*
* 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)));
}
/* ----------------------------------------------------------------------- */
/* ----------------------------------------------------------------------- */
/* Inlined functions */
/**
* ds1685_rtc_bcd2bin - bcd2bin wrapper in case platform doesn't support BCD.
* @rtc: pointer to the ds1685 rtc structure.
* @val: u8 time value to consider converting.
* @bcd_mask: u8 mask value if BCD mode is used.
* @bin_mask: u8 mask value if BIN mode is used.
*
* Returns the value, converted to BIN if originally in BCD and bcd_mode TRUE.
*/
static inline u8
ds1685_rtc_bcd2bin(struct ds1685_priv *rtc, u8 val, u8 bcd_mask, u8 bin_mask)
{
if (rtc->bcd_mode)
return (bcd2bin(val) & bcd_mask);
return (val & bin_mask);
}
/**
* ds1685_rtc_bin2bcd - bin2bcd wrapper in case platform doesn't support BCD.
* @rtc: pointer to the ds1685 rtc structure.
* @val: u8 time value to consider converting.
* @bin_mask: u8 mask value if BIN mode is used.
* @bcd_mask: u8 mask value if BCD mode is used.
*
* Returns the value, converted to BCD if originally in BIN and bcd_mode TRUE.
*/
static inline u8
ds1685_rtc_bin2bcd(struct ds1685_priv *rtc, u8 val, u8 bin_mask, u8 bcd_mask)
{
if (rtc->bcd_mode)
return (bin2bcd(val) & bcd_mask);
return (val & bin_mask);
}
/**
* s1685_rtc_check_mday - check validity of the day of month.
* @rtc: pointer to the ds1685 rtc structure.
* @mday: day of month.
*
* Returns -EDOM if the day of month is not within 1..31 range.
*/
static inline int
ds1685_rtc_check_mday(struct ds1685_priv *rtc, u8 mday)
{
if (rtc->bcd_mode) {
if (mday < 0x01 || mday > 0x31 || (mday & 0x0f) > 0x09)
return -EDOM;
} else {
if (mday < 1 || mday > 31)
return -EDOM;
}
return 0;
}
/**
* ds1685_rtc_switch_to_bank0 - switch the rtc to bank 0.
* @rtc: pointer to the ds1685 rtc structure.
*/
static inline void
ds1685_rtc_switch_to_bank0(struct ds1685_priv *rtc)
{
rtc->write(rtc, RTC_CTRL_A,
(rtc->read(rtc, RTC_CTRL_A) & ~(RTC_CTRL_A_DV0)));
}
/**
* ds1685_rtc_
| 