mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-23 17:30:02 +00:00
![Colin Ian King](/assets/img/avatar_default.png)
The function name is missing the letter 'd' in the comment block. Fix it. Signed-off-by: Colin Ian King <colin.i.king@gmail.com> Acked-by: Joshua Kinard <kumba@gentoo.org> Link: https://lore.kernel.org/r/20221003153711.271630-1-colin.i.king@gmail.com Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
1445 lines
41 KiB
C
1445 lines
41 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* 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.
|
|
*/
|
|
|
|
#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
|
|
* all registers are mapped in CPU address space
|
|
*/
|
|
|
|
/**
|
|
* 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)));
|
|
}
|
|
/* ----------------------------------------------------------------------- */
|
|
|
|
/*
|
|
* Indirect read/write functions
|
|
* access happens via address and data register mapped in CPU address space
|
|
*/
|
|
|
|
/**
|
|
* ds1685_indirect_read - read a value from an rtc register.
|
|
* @rtc: pointer to the ds1685 rtc structure.
|
|
* @reg: the register address to read.
|
|
*/
|
|
static u8
|
|
ds1685_indirect_read(struct ds1685_priv *rtc, int reg)
|
|
{
|
|
writeb(reg, rtc->regs);
|
|
return readb(rtc->data);
|
|
}
|
|
|
|
/**
|
|
* ds1685_indirect_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_indirect_write(struct ds1685_priv *rtc, int reg, u8 value)
|
|
{
|
|
writeb(reg, rtc->regs);
|
|
writeb(value, rtc->data);
|
|
}
|
|
|
|
/* ----------------------------------------------------------------------- */
|
|
/* 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);
|
|
}
|
|
|
|
/**
|
|
* ds1685_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_switch_to_bank1 - switch the rtc to bank 1.
|
|
* @rtc: pointer to the ds1685 rtc structure.
|
|
*/
|
|
static inline void
|
|
ds1685_rtc_switch_to_bank1(struct ds1685_priv *rtc)
|
|
{
|
|
rtc->write(rtc, RTC_CTRL_A,
|
|
(rtc->read(rtc, RTC_CTRL_A) | RTC_CTRL_A_DV0));
|
|
}
|
|
|
|
/**
|
|
* ds1685_rtc_begin_data_access - prepare the rtc for data access.
|
|
* @rtc: pointer to the ds1685 rtc structure.
|
|
*
|
|
* This takes several steps to prepare the rtc for access to get/set time
|
|
* and alarm values from the rtc registers:
|
|
* - Sets the SET bit in Control Register B.
|
|
* - Reads Ext Control Register 4A and checks the INCR bit.
|
|
* - If INCR is active, a short delay is added before Ext Control Register 4A
|
|
* is read again in a loop until INCR is inactive.
|
|
* - Switches the rtc to bank 1. This allows access to all relevant
|
|
* data for normal rtc operation, as bank 0 contains only the nvram.
|
|
*/
|
|
static inline void
|
|
ds1685_rtc_begin_data_access(struct ds1685_priv *rtc)
|
|
{
|
|
/* Set the SET bit in Ctrl B */
|
|
rtc->write(rtc, RTC_CTRL_B,
|
|
(rtc->read(rtc, RTC_CTRL_B) | RTC_CTRL_B_SET));
|
|
|
|
/* Switch to Bank 1 */
|
|
ds1685_rtc_switch_to_bank1(rtc);
|
|
|
|
/* Read Ext Ctrl 4A and check the INCR bit to avoid a lockout. */
|
|
while (rtc->read(rtc, RTC_EXT_CTRL_4A) & RTC_CTRL_4A_INCR)
|
|
cpu_relax();
|
|
}
|
|
|
|
/**
|
|
* ds1685_rtc_end_data_access - end data access on the rtc.
|
|
* @rtc: pointer to the ds1685 rtc structure.
|
|
*
|
|
* This ends what was started by ds1685_rtc_begin_data_access:
|
|
* - Switches the rtc back to bank 0.
|
|
* - Clears the SET bit in Control Register B.
|
|
*/
|
|
static inline void
|
|
ds1685_rtc_end_data_access(struct ds1685_priv *rtc)
|
|
{
|
|
/* Switch back to Bank 0 */
|
|
ds1685_rtc_switch_to_bank0(rtc);
|
|
|
|
/* Clear the SET bit in Ctrl B */
|
|
rtc->write(rtc, RTC_CTRL_B,
|
|
(rtc->read(rtc, RTC_CTRL_B) & ~(RTC_CTRL_B_SET)));
|
|
}
|
|
|
|
/**
|
|
* ds1685_rtc_get_ssn - retrieve the silicon serial number.
|
|
* @rtc: pointer to the ds1685 rtc structure.
|
|
* @ssn: u8 array to hold the bits of the silicon serial number.
|
|
*
|
|
* This number starts at 0x40, and is 8-bytes long, ending at 0x47. The
|
|
* first byte is the model number, the next six bytes are the serial number
|
|
* digits, and the final byte is a CRC check byte. Together, they form the
|
|
* silicon serial number.
|
|
*
|
|
* These values are stored in bank1, so ds1685_rtc_switch_to_bank1 must be
|
|
* called first before calling this function, else data will be read out of
|
|
* the bank0 NVRAM. Be sure to call ds1685_rtc_switch_to_bank0 when done.
|
|
*/
|
|
static inline void
|
|
ds1685_rtc_get_ssn(struct ds1685_priv *rtc, u8 *ssn)
|
|
{
|
|
ssn[0] = rtc->read(rtc, RTC_BANK1_SSN_MODEL);
|
|
ssn[1] = rtc->read(rtc, RTC_BANK1_SSN_BYTE_1);
|
|
ssn[2] = rtc->read(rtc, RTC_BANK1_SSN_BYTE_2);
|
|
ssn[3] = rtc->read(rtc, RTC_BANK1_SSN_BYTE_3);
|
|
ssn[4] = rtc->read(rtc, RTC_BANK1_SSN_BYTE_4);
|
|
ssn[5] = rtc->read(rtc, RTC_BANK1_SSN_BYTE_5);
|
|
ssn[6] = rtc->read(rtc, RTC_BANK1_SSN_BYTE_6);
|
|
ssn[7] = rtc->read(rtc, RTC_BANK1_SSN_CRC);
|
|
}
|
|
/* ----------------------------------------------------------------------- */
|
|
|
|
|
|
/* ----------------------------------------------------------------------- */
|
|
/* Read/Set Time & Alarm functions */
|
|
|
|
/**
|
|
* ds1685_rtc_read_time - reads the time registers.
|
|
* @dev: pointer to device structure.
|
|
* @tm: pointer to rtc_time structure.
|
|
*/
|
|
static int
|
|
ds1685_rtc_read_time(struct device *dev, struct rtc_time *tm)
|
|
{
|
|
struct ds1685_priv *rtc = dev_get_drvdata(dev);
|
|
u8 century;
|
|
u8 seconds, minutes, hours, wday, mday, month, years;
|
|
|
|
/* Fetch the time info from the RTC registers. */
|
|
ds1685_rtc_begin_data_access(rtc);
|
|
seconds = rtc->read(rtc, RTC_SECS);
|
|
minutes = rtc->read(rtc, RTC_MINS);
|
|
hours = rtc->read(rtc, RTC_HRS);
|
|
wday = rtc->read(rtc, RTC_WDAY);
|
|
mday = rtc->read(rtc, RTC_MDAY);
|
|
month = rtc->read(rtc, RTC_MONTH);
|
|
years = rtc->read(rtc, RTC_YEAR);
|
|
century = rtc->read(rtc, RTC_CENTURY);
|
|
ds1685_rtc_end_data_access(rtc);
|
|
|
|
/* bcd2bin if needed, perform fixups, and store to rtc_time. */
|
|
years = ds1685_rtc_bcd2bin(rtc, years, RTC_YEAR_BCD_MASK,
|
|
RTC_YEAR_BIN_MASK);
|
|
century = ds1685_rtc_bcd2bin(rtc, century, RTC_CENTURY_MASK,
|
|
RTC_CENTURY_MASK);
|
|
tm->tm_sec = ds1685_rtc_bcd2bin(rtc, seconds, RTC_SECS_BCD_MASK,
|
|
RTC_SECS_BIN_MASK);
|
|
tm->tm_min = ds1685_rtc_bcd2bin(rtc, minutes, RTC_MINS_BCD_MASK,
|
|
RTC_MINS_BIN_MASK);
|
|
tm->tm_hour = ds1685_rtc_bcd2bin(rtc, hours, RTC_HRS_24_BCD_MASK,
|
|
RTC_HRS_24_BIN_MASK);
|
|
tm->tm_wday = (ds1685_rtc_bcd2bin(rtc, wday, RTC_WDAY_MASK,
|
|
RTC_WDAY_MASK) - 1);
|
|
tm->tm_mday = ds1685_rtc_bcd2bin(rtc, mday, RTC_MDAY_BCD_MASK,
|
|
RTC_MDAY_BIN_MASK);
|
|
tm->tm_mon = (ds1685_rtc_bcd2bin(rtc, month, RTC_MONTH_BCD_MASK,
|
|
RTC_MONTH_BIN_MASK) - 1);
|
|
tm->tm_year = ((years + (century * 100)) - 1900);
|
|
tm->tm_yday = rtc_year_days(tm->tm_mday, tm->tm_mon, tm->tm_year);
|
|
tm->tm_isdst = 0; /* RTC has hardcoded timezone, so don't use. */
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* ds1685_rtc_set_time - sets the time registers.
|
|
* @dev: pointer to device structure.
|
|
* @tm: pointer to rtc_time structure.
|
|
*/
|
|
static int
|
|
ds1685_rtc_set_time(struct device *dev, struct rtc_time *tm)
|
|
{
|
|
struct ds1685_priv *rtc = dev_get_drvdata(dev);
|
|
u8 ctrlb, seconds, minutes, hours, wday, mday, month, years, century;
|
|
|
|
/* Fetch the time info from rtc_time. */
|
|
seconds = ds1685_rtc_bin2bcd(rtc, tm->tm_sec, RTC_SECS_BIN_MASK,
|
|
RTC_SECS_BCD_MASK);
|
|
minutes = ds1685_rtc_bin2bcd(rtc, tm->tm_min, RTC_MINS_BIN_MASK,
|
|
RTC_MINS_BCD_MASK);
|
|
hours = ds1685_rtc_bin2bcd(rtc, tm->tm_hour, RTC_HRS_24_BIN_MASK,
|
|
RTC_HRS_24_BCD_MASK);
|
|
wday = ds1685_rtc_bin2bcd(rtc, (tm->tm_wday + 1), RTC_WDAY_MASK,
|
|
RTC_WDAY_MASK);
|
|
mday = ds1685_rtc_bin2bcd(rtc, tm->tm_mday, RTC_MDAY_BIN_MASK,
|
|
RTC_MDAY_BCD_MASK);
|
|
month = ds1685_rtc_bin2bcd(rtc, (tm->tm_mon + 1), RTC_MONTH_BIN_MASK,
|
|
RTC_MONTH_BCD_MASK);
|
|
years = ds1685_rtc_bin2bcd(rtc, (tm->tm_year % 100),
|
|
RTC_YEAR_BIN_MASK, RTC_YEAR_BCD_MASK);
|
|
century = ds1685_rtc_bin2bcd(rtc, ((tm->tm_year + 1900) / 100),
|
|
RTC_CENTURY_MASK, RTC_CENTURY_MASK);
|
|
|
|
/*
|
|
* Perform Sanity Checks:
|
|
* - Months: !> 12, Month Day != 0.
|
|
* - Month Day !> Max days in current month.
|
|
* - Hours !>= 24, Mins !>= 60, Secs !>= 60, & Weekday !> 7.
|
|
*/
|
|
if ((tm->tm_mon > 11) || (mday == 0))
|
|
return -EDOM;
|
|
|
|
if (tm->tm_mday > rtc_month_days(tm->tm_mon, tm->tm_year))
|
|
return -EDOM;
|
|
|
|
if ((tm->tm_hour >= 24) || (tm->tm_min >= 60) ||
|
|
(tm->tm_sec >= 60) || (wday > 7))
|
|
return -EDOM;
|
|
|
|
/*
|
|
* Set the data mode to use and store the time values in the
|
|
* RTC registers.
|
|
*/
|
|
ds1685_rtc_begin_data_access(rtc);
|
|
ctrlb = rtc->read(rtc, RTC_CTRL_B);
|
|
if (rtc->bcd_mode)
|
|
ctrlb &= ~(RTC_CTRL_B_DM);
|
|
else
|
|
ctrlb |= RTC_CTRL_B_DM;
|
|
rtc->write(rtc, RTC_CTRL_B, ctrlb);
|
|
rtc->write(rtc, RTC_SECS, seconds);
|
|
rtc->write(rtc, RTC_MINS, minutes);
|
|
rtc->write(rtc, RTC_HRS, hours);
|
|
rtc->write(rtc, RTC_WDAY, wday);
|
|
rtc->write(rtc, RTC_MDAY, mday);
|
|
rtc->write(rtc, RTC_MONTH, month);
|
|
rtc->write(rtc, RTC_YEAR, years);
|
|
rtc->write(rtc, RTC_CENTURY, century);
|
|
ds1685_rtc_end_data_access(rtc);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* ds1685_rtc_read_alarm - reads the alarm registers.
|
|
* @dev: pointer to device structure.
|
|
* @alrm: pointer to rtc_wkalrm structure.
|
|
*
|
|
* There are three primary alarm registers: seconds, minutes, and hours.
|
|
* A fourth alarm register for the month date is also available in bank1 for
|
|
* kickstart/wakeup features. The DS1685/DS1687 manual states that a
|
|
* "don't care" value ranging from 0xc0 to 0xff may be written into one or
|
|
* more of the three alarm bytes to act as a wildcard value. The fourth
|
|
* byte doesn't support a "don't care" value.
|
|
*/
|
|
static int
|
|
ds1685_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alrm)
|
|
{
|
|
struct ds1685_priv *rtc = dev_get_drvdata(dev);
|
|
u8 seconds, minutes, hours, mday, ctrlb, ctrlc;
|
|
int ret;
|
|
|
|
/* Fetch the alarm info from the RTC alarm registers. */
|
|
ds1685_rtc_begin_data_access(rtc);
|
|
seconds = rtc->read(rtc, RTC_SECS_ALARM);
|
|
minutes = rtc->read(rtc, RTC_MINS_ALARM);
|
|
hours = rtc->read(rtc, RTC_HRS_ALARM);
|
|
mday = rtc->read(rtc, RTC_MDAY_ALARM);
|
|
ctrlb = rtc->read(rtc, RTC_CTRL_B);
|
|
ctrlc = rtc->read(rtc, RTC_CTRL_C);
|
|
ds1685_rtc_end_data_access(rtc);
|
|
|
|
/* Check the month date for validity. */
|
|
ret = ds1685_rtc_check_mday(rtc, mday);
|
|
if (ret)
|
|
return ret;
|
|
|
|
/*
|
|
* Check the three alarm bytes.
|
|
*
|
|
* The Linux RTC system doesn't support the "don't care" capability
|
|
* of this RTC chip. We check for it anyways in case support is
|
|
* added in the future and only assign when we care.
|
|
*/
|
|
if (likely(seconds < 0xc0))
|
|
alrm->time.tm_sec = ds1685_rtc_bcd2bin(rtc, seconds,
|
|
RTC_SECS_BCD_MASK,
|
|
RTC_SECS_BIN_MASK);
|
|
|
|
if (likely(minutes < 0xc0))
|
|
alrm->time.tm_min = ds1685_rtc_bcd2bin(rtc, minutes,
|
|
RTC_MINS_BCD_MASK,
|
|
RTC_MINS_BIN_MASK);
|
|
|
|
if (likely(hours < 0xc0))
|
|
alrm->time.tm_hour = ds1685_rtc_bcd2bin(rtc, hours,
|
|
RTC_HRS_24_BCD_MASK,
|
|
RTC_HRS_24_BIN_MASK);
|
|
|
|
/* Write the data to rtc_wkalrm. */
|
|
alrm->time.tm_mday = ds1685_rtc_bcd2bin(rtc, mday, RTC_MDAY_BCD_MASK,
|
|
RTC_MDAY_BIN_MASK);
|
|
alrm->enabled = !!(ctrlb & RTC_CTRL_B_AIE);
|
|
alrm->pending = !!(ctrlc & RTC_CTRL_C_AF);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* ds1685_rtc_set_alarm - sets the alarm in registers.
|
|
* @dev: pointer to device structure.
|
|
* @alrm: pointer to rtc_wkalrm structure.
|
|
*/
|
|
static int
|
|
ds1685_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alrm)
|
|
{
|
|
struct ds1685_priv *rtc = dev_get_drvdata(dev);
|
|
u8 ctrlb, seconds, minutes, hours, mday;
|
|
int ret;
|
|
|
|
/* Fetch the alarm info and convert to BCD. */
|
|
seconds = ds1685_rtc_bin2bcd(rtc, alrm->time.tm_sec,
|
|
RTC_SECS_BIN_MASK,
|
|
RTC_SECS_BCD_MASK);
|
|
minutes = ds1685_rtc_bin2bcd(rtc, alrm->time.tm_min,
|
|
RTC_MINS_BIN_MASK,
|
|
RTC_MINS_BCD_MASK);
|
|
hours = ds1685_rtc_bin2bcd(rtc, alrm->time.tm_hour,
|
|
RTC_HRS_24_BIN_MASK,
|
|
RTC_HRS_24_BCD_MASK);
|
|
mday = ds1685_rtc_bin2bcd(rtc, alrm->time.tm_mday,
|
|
RTC_MDAY_BIN_MASK,
|
|
RTC_MDAY_BCD_MASK);
|
|
|
|
/* Check the month date for validity. */
|
|
ret = ds1685_rtc_check_mday(rtc, mday);
|
|
if (ret)
|
|
return ret;
|
|
|
|
/*
|
|
* Check the three alarm bytes.
|
|
*
|
|
* The Linux RTC system doesn't support the "don't care" capability
|
|
* of this RTC chip because rtc_valid_tm tries to validate every
|
|
* field, and we only support four fields. We put the support
|
|
* here anyways for the future.
|
|
*/
|
|
if (unlikely(seconds >= 0xc0))
|
|
seconds = 0xff;
|
|
|
|
if (unlikely(minutes >= 0xc0))
|
|
minutes = 0xff;
|
|
|
|
if (unlikely(hours >= 0xc0))
|
|
hours = 0xff;
|
|
|
|
alrm->time.tm_mon = -1;
|
|
alrm->time.tm_year = -1;
|
|
alrm->time.tm_wday = -1;
|
|
alrm->time.tm_yday = -1;
|
|
alrm->time.tm_isdst = -1;
|
|
|
|
/* Disable the alarm interrupt first. */
|
|
ds1685_rtc_begin_data_access(rtc);
|
|
ctrlb = rtc->read(rtc, RTC_CTRL_B);
|
|
rtc->write(rtc, RTC_CTRL_B, (ctrlb & ~(RTC_CTRL_B_AIE)));
|
|
|
|
/* Read ctrlc to clear RTC_CTRL_C_AF. */
|
|
rtc->read(rtc, RTC_CTRL_C);
|
|
|
|
/*
|
|
* Set the data mode to use and store the time values in the
|
|
* RTC registers.
|
|
*/
|
|
ctrlb = rtc->read(rtc, RTC_CTRL_B);
|
|
if (rtc->bcd_mode)
|
|
ctrlb &= ~(RTC_CTRL_B_DM);
|
|
else
|
|
ctrlb |= RTC_CTRL_B_DM;
|
|
rtc->write(rtc, RTC_CTRL_B, ctrlb);
|
|
rtc->write(rtc, RTC_SECS_ALARM, seconds);
|
|
rtc->write(rtc, RTC_MINS_ALARM, minutes);
|
|
rtc->write(rtc, RTC_HRS_ALARM, hours);
|
|
rtc->write(rtc, RTC_MDAY_ALARM, mday);
|
|
|
|
/* Re-enable the alarm if needed. */
|
|
if (alrm->enabled) {
|
|
ctrlb = rtc->read(rtc, RTC_CTRL_B);
|
|
ctrlb |= RTC_CTRL_B_AIE;
|
|
rtc->write(rtc, RTC_CTRL_B, ctrlb);
|
|
}
|
|
|
|
/* Done! */
|
|
ds1685_rtc_end_data_access(rtc);
|
|
|
|
return 0;
|
|
}
|
|
/* ----------------------------------------------------------------------- */
|
|
|
|
|
|
/* ----------------------------------------------------------------------- */
|
|
/* /dev/rtcX Interface functions */
|
|
|
|
/**
|
|
* ds1685_rtc_alarm_irq_enable - replaces ioctl() RTC_AIE on/off.
|
|
* @dev: pointer to device structure.
|
|
* @enabled: flag indicating whether to enable or disable.
|
|
*/
|
|
static int
|
|
ds1685_rtc_alarm_irq_enable(struct device *dev, unsigned int enabled)
|
|
{
|
|
struct ds1685_priv *rtc = dev_get_drvdata(dev);
|
|
|
|
/* Flip the requisite interrupt-enable bit. */
|
|
if (enabled)
|
|
rtc->write(rtc, RTC_CTRL_B, (rtc->read(rtc, RTC_CTRL_B) |
|
|
RTC_CTRL_B_AIE));
|
|
else
|
|
rtc->write(rtc, RTC_CTRL_B, (rtc->read(rtc, RTC_CTRL_B) &
|
|
~(RTC_CTRL_B_AIE)));
|
|
|
|
/* Read Control C to clear all the flag bits. */
|
|
rtc->read(rtc, RTC_CTRL_C);
|
|
|
|
return 0;
|
|
}
|
|
/* ----------------------------------------------------------------------- */
|
|
|
|
|
|
/* ----------------------------------------------------------------------- */
|
|
/* IRQ handler */
|
|
|
|
/**
|
|
* ds1685_rtc_extended_irq - take care of extended interrupts
|
|
* @rtc: pointer to the ds1685 rtc structure.
|
|
* @pdev: platform device pointer.
|
|
*/
|
|
static void
|
|
ds1685_rtc_extended_irq(struct ds1685_priv *rtc, struct platform_device *pdev)
|
|
{
|
|
u8 ctrl4a, ctrl4b;
|
|
|
|
ds1685_rtc_switch_to_bank1(rtc);
|
|
ctrl4a = rtc->read(rtc, RTC_EXT_CTRL_4A);
|
|
ctrl4b = rtc->read(rtc, RTC_EXT_CTRL_4B);
|
|
|
|
/*
|
|
* Check for a kickstart interrupt. With Vcc applied, this
|
|
* typically means that the power button was pressed, so we
|
|
* begin the shutdown sequence.
|
|
*/
|
|
if ((ctrl4b & RTC_CTRL_4B_KSE) && (ctrl4a & RTC_CTRL_4A_KF)) {
|
|
/* Briefly disable kickstarts to debounce button presses. */
|
|
rtc->write(rtc, RTC_EXT_CTRL_4B,
|
|
(rtc->read(rtc, RTC_EXT_CTRL_4B) &
|
|
~(RTC_CTRL_4B_KSE)));
|
|
|
|
/* Clear the kickstart flag. */
|
|
rtc->write(rtc, RTC_EXT_CTRL_4A,
|
|
(ctrl4a & ~(RTC_CTRL_4A_KF)));
|
|
|
|
|
|
/*
|
|
* Sleep 500ms before re-enabling kickstarts. This allows
|
|
* adequate time to avoid reading signal jitter as additional
|
|
* button presses.
|
|
*/
|
|
msleep(500);
|
|
rtc->write(rtc, RTC_EXT_CTRL_4B,
|
|
(rtc->read(rtc, RTC_EXT_CTRL_4B) |
|
|
RTC_CTRL_4B_KSE));
|
|
|
|
/* Call the platform pre-poweroff function. Else, shutdown. */
|
|
if (rtc->prepare_poweroff != NULL)
|
|
rtc->prepare_poweroff();
|
|
else
|
|
ds1685_rtc_poweroff(pdev);
|
|
}
|
|
|
|
/*
|
|
* Check for a wake-up interrupt. With Vcc applied, this is
|
|
* essentially a second alarm interrupt, except it takes into
|
|
* account the 'date' register in bank1 in addition to the
|
|
* standard three alarm registers.
|
|
*/
|
|
if ((ctrl4b & RTC_CTRL_4B_WIE) && (ctrl4a & RTC_CTRL_4A_WF)) {
|
|
rtc->write(rtc, RTC_EXT_CTRL_4A,
|
|
(ctrl4a & ~(RTC_CTRL_4A_WF)));
|
|
|
|
/* Call the platform wake_alarm function if defined. */
|
|
if (rtc->wake_alarm != NULL)
|
|
rtc->wake_alarm();
|
|
else
|
|
dev_warn(&pdev->dev,
|
|
"Wake Alarm IRQ just occurred!\n");
|
|
}
|
|
|
|
/*
|
|
* Check for a ram-clear interrupt. This happens if RIE=1 and RF=0
|
|
* when RCE=1 in 4B. This clears all NVRAM bytes in bank0 by setting
|
|
* each byte to a logic 1. This has no effect on any extended
|
|
* NV-SRAM that might be present, nor on the time/calendar/alarm
|
|
* registers. After a ram-clear is completed, there is a minimum
|
|
* recovery time of ~150ms in which all reads/writes are locked out.
|
|
* NOTE: A ram-clear can still occur if RCE=1 and RIE=0. We cannot
|
|
* catch this scenario.
|
|
*/
|
|
if ((ctrl4b & RTC_CTRL_4B_RIE) && (ctrl4a & RTC_CTRL_4A_RF)) {
|
|
rtc->write(rtc, RTC_EXT_CTRL_4A,
|
|
(ctrl4a & ~(RTC_CTRL_4A_RF)));
|
|
msleep(150);
|
|
|
|
/* Call the platform post_ram_clear function if defined. */
|
|
if (rtc->post_ram_clear != NULL)
|
|
rtc->post_ram_clear();
|
|
else
|
|
dev_warn(&pdev->dev,
|
|
"RAM-Clear IRQ just occurred!\n");
|
|
}
|
|
ds1685_rtc_switch_to_bank0(rtc);
|
|
}
|
|
|
|
/**
|
|
* ds1685_rtc_irq_handler - IRQ handler.
|
|
* @irq: IRQ number.
|
|
* @dev_id: platform device pointer.
|
|
*/
|
|
static irqreturn_t
|
|
ds1685_rtc_irq_handler(int irq, void *dev_id)
|
|
{
|
|
struct platform_device *pdev = dev_id;
|
|
struct ds1685_priv *rtc = platform_get_drvdata(pdev);
|
|
u8 ctrlb, ctrlc;
|
|
unsigned long events = 0;
|
|
u8 num_irqs = 0;
|
|
|
|
/* Abort early if the device isn't ready yet (i.e., DEBUG_SHIRQ). */
|
|
if (unlikely(!rtc))
|
|
return IRQ_HANDLED;
|
|
|
|
rtc_lock(rtc->dev);
|
|
|
|
/* Ctrlb holds the interrupt-enable bits and ctrlc the flag bits. */
|
|
ctrlb = rtc->read(rtc, RTC_CTRL_B);
|
|
ctrlc = rtc->read(rtc, RTC_CTRL_C);
|
|
|
|
/* Is the IRQF bit set? */
|
|
if (likely(ctrlc & RTC_CTRL_C_IRQF)) {
|
|
/*
|
|
* We need to determine if it was one of the standard
|
|
* events: PF, AF, or UF. If so, we handle them and
|
|
* update the RTC core.
|
|
*/
|
|
if (likely(ctrlc & RTC_CTRL_B_PAU_MASK)) {
|
|
events = RTC_IRQF;
|
|
|
|
/* Check for a periodic interrupt. */
|
|
if ((ctrlb & RTC_CTRL_B_PIE) &&
|
|
(ctrlc & RTC_CTRL_C_PF)) {
|
|
events |= RTC_PF;
|
|
num_irqs++;
|
|
}
|
|
|
|
/* Check for an alarm interrupt. */
|
|
if ((ctrlb & RTC_CTRL_B_AIE) &&
|
|
(ctrlc & RTC_CTRL_C_AF)) {
|
|
events |= RTC_AF;
|
|
num_irqs++;
|
|
}
|
|
|
|
/* Check for an update interrupt. */
|
|
if ((ctrlb & RTC_CTRL_B_UIE) &&
|
|
(ctrlc & RTC_CTRL_C_UF)) {
|
|
events |= RTC_UF;
|
|
num_irqs++;
|
|
}
|
|
} else {
|
|
/*
|
|
* One of the "extended" interrupts was received that
|
|
* is not recognized by the RTC core.
|
|
*/
|
|
ds1685_rtc_extended_irq(rtc, pdev);
|
|
}
|
|
}
|
|
rtc_update_irq(rtc->dev, num_irqs, events);
|
|
rtc_unlock(rtc->dev);
|
|
|
|
return events ? IRQ_HANDLED : IRQ_NONE;
|
|
}
|
|
/* ----------------------------------------------------------------------- */
|
|
|
|
|
|
/* ----------------------------------------------------------------------- */
|
|
/* ProcFS interface */
|
|
|
|
#ifdef CONFIG_PROC_FS
|
|
#define NUM_REGS 6 /* Num of control registers. */
|
|
#define NUM_BITS 8 /* Num bits per register. */
|
|
#define NUM_SPACES 4 /* Num spaces between each bit. */
|
|
|
|
/*
|
|
* Periodic Interrupt Rates.
|
|
*/
|
|
static const char *ds1685_rtc_pirq_rate[16] = {
|
|
"none", "3.90625ms", "7.8125ms", "0.122070ms", "0.244141ms",
|
|
"0.488281ms", "0.9765625ms", "1.953125ms", "3.90625ms", "7.8125ms",
|
|
"15.625ms", "31.25ms", "62.5ms", "125ms", "250ms", "500ms"
|
|
};
|
|
|
|
/*
|
|
* Square-Wave Output Frequencies.
|
|
*/
|
|
static const char *ds1685_rtc_sqw_freq[16] = {
|
|
"none", "256Hz", "128Hz", "8192Hz", "4096Hz", "2048Hz", "1024Hz",
|
|
"512Hz", "256Hz", "128Hz", "64Hz", "32Hz", "16Hz", "8Hz", "4Hz", "2Hz"
|
|
};
|
|
|
|
/**
|
|
* ds1685_rtc_proc - procfs access function.
|
|
* @dev: pointer to device structure.
|
|
* @seq: pointer to seq_file structure.
|
|
*/
|
|
static int
|
|
ds1685_rtc_proc(struct device *dev, struct seq_file *seq)
|
|
{
|
|
struct ds1685_priv *rtc = dev_get_drvdata(dev);
|
|
u8 ctrla, ctrlb, ctrld, ctrl4a, ctrl4b, ssn[8];
|
|
char *model;
|
|
|
|
/* Read all the relevant data from the control registers. */
|
|
ds1685_rtc_switch_to_bank1(rtc);
|
|
ds1685_rtc_get_ssn(rtc, ssn);
|
|
ctrla = rtc->read(rtc, RTC_CTRL_A);
|
|
ctrlb = rtc->read(rtc, RTC_CTRL_B);
|
|
ctrld = rtc->read(rtc, RTC_CTRL_D);
|
|
ctrl4a = rtc->read(rtc, RTC_EXT_CTRL_4A);
|
|
ctrl4b = rtc->read(rtc, RTC_EXT_CTRL_4B);
|
|
ds1685_rtc_switch_to_bank0(rtc);
|
|
|
|
/* Determine the RTC model. */
|
|
switch (ssn[0]) {
|
|
case RTC_MODEL_DS1685:
|
|
model = "DS1685/DS1687\0";
|
|
break;
|
|
case RTC_MODEL_DS1689:
|
|
model = "DS1689/DS1693\0";
|
|
break;
|
|
case RTC_MODEL_DS17285:
|
|
model = "DS17285/DS17287\0";
|
|
break;
|
|
case RTC_MODEL_DS17485:
|
|
model = "DS17485/DS17487\0";
|
|
break;
|
|
case RTC_MODEL_DS17885:
|
|
model = "DS17885/DS17887\0";
|
|
break;
|
|
default:
|
|
model = "Unknown\0";
|
|
break;
|
|
}
|
|
|
|
/* Print out the information. */
|
|
seq_printf(seq,
|
|
"Model\t\t: %s\n"
|
|
"Oscillator\t: %s\n"
|
|
"12/24hr\t\t: %s\n"
|
|
"DST\t\t: %s\n"
|
|
"Data mode\t: %s\n"
|
|
"Battery\t\t: %s\n"
|
|
"Aux batt\t: %s\n"
|
|
"Update IRQ\t: %s\n"
|
|
"Periodic IRQ\t: %s\n"
|
|
"Periodic Rate\t: %s\n"
|
|
"SQW Freq\t: %s\n"
|
|
"Serial #\t: %8phC\n",
|
|
model,
|
|
((ctrla & RTC_CTRL_A_DV1) ? "enabled" : "disabled"),
|
|
((ctrlb & RTC_CTRL_B_2412) ? "24-hour" : "12-hour"),
|
|
((ctrlb & RTC_CTRL_B_DSE) ? "enabled" : "disabled"),
|
|
((ctrlb & RTC_CTRL_B_DM) ? "binary" : "BCD"),
|
|
((ctrld & RTC_CTRL_D_VRT) ? "ok" : "exhausted or n/a"),
|
|
((ctrl4a & RTC_CTRL_4A_VRT2) ? "ok" : "exhausted or n/a"),
|
|
((ctrlb & RTC_CTRL_B_UIE) ? "yes" : "no"),
|
|
((ctrlb & RTC_CTRL_B_PIE) ? "yes" : "no"),
|
|
(!(ctrl4b & RTC_CTRL_4B_E32K) ?
|
|
ds1685_rtc_pirq_rate[(ctrla & RTC_CTRL_A_RS_MASK)] : "none"),
|
|
(!((ctrl4b & RTC_CTRL_4B_E32K)) ?
|
|
ds1685_rtc_sqw_freq[(ctrla & RTC_CTRL_A_RS_MASK)] : "32768Hz"),
|
|
ssn);
|
|
return 0;
|
|
}
|
|
#else
|
|
#define ds1685_rtc_proc NULL
|
|
#endif /* CONFIG_PROC_FS */
|
|
/* ----------------------------------------------------------------------- */
|
|
|
|
|
|
/* ----------------------------------------------------------------------- */
|
|
/* RTC Class operations */
|
|
|
|
static const struct rtc_class_ops
|
|
ds1685_rtc_ops = {
|
|
.proc = ds1685_rtc_proc,
|
|
.read_time = ds1685_rtc_read_time,
|
|
.set_time = ds1685_rtc_set_time,
|
|
.read_alarm = ds1685_rtc_read_alarm,
|
|
.set_alarm = ds1685_rtc_set_alarm,
|
|
.alarm_irq_enable = ds1685_rtc_alarm_irq_enable,
|
|
};
|
|
/* ----------------------------------------------------------------------- */
|
|
|
|
static int ds1685_nvram_read(void *priv, unsigned int pos, void *val,
|
|
size_t size)
|
|
{
|
|
struct ds1685_priv *rtc = priv;
|
|
struct mutex *rtc_mutex = &rtc->dev->ops_lock;
|
|
ssize_t count;
|
|
u8 *buf = val;
|
|
int err;
|
|
|
|
err = mutex_lock_interruptible(rtc_mutex);
|
|
if (err)
|
|
return err;
|
|
|
|
ds1685_rtc_switch_to_bank0(rtc);
|
|
|
|
/* Read NVRAM in time and bank0 registers. */
|
|
for (count = 0; size > 0 && pos < NVRAM_TOTAL_SZ_BANK0;
|
|
count++, size--) {
|
|
if (count < NVRAM_SZ_TIME)
|
|
*buf++ = rtc->read(rtc, (NVRAM_TIME_BASE + pos++));
|
|
else
|
|
*buf++ = rtc->read(rtc, (NVRAM_BANK0_BASE + pos++));
|
|
}
|
|
|
|
#ifndef CONFIG_RTC_DRV_DS1689
|
|
if (size > 0) {
|
|
ds1685_rtc_switch_to_bank1(rtc);
|
|
|
|
#ifndef CONFIG_RTC_DRV_DS1685
|
|
/* Enable burst-mode on DS17x85/DS17x87 */
|
|
rtc->write(rtc, RTC_EXT_CTRL_4A,
|
|
(rtc->read(rtc, RTC_EXT_CTRL_4A) |
|
|
RTC_CTRL_4A_BME));
|
|
|
|
/* We need one write to RTC_BANK1_RAM_ADDR_LSB to start
|
|
* reading with burst-mode */
|
|
rtc->write(rtc, RTC_BANK1_RAM_ADDR_LSB,
|
|
(pos - NVRAM_TOTAL_SZ_BANK0));
|
|
#endif
|
|
|
|
/* Read NVRAM in bank1 registers. */
|
|
for (count = 0; size > 0 && pos < NVRAM_TOTAL_SZ;
|
|
count++, size--) {
|
|
#ifdef CONFIG_RTC_DRV_DS1685
|
|
/* DS1685/DS1687 has to write to RTC_BANK1_RAM_ADDR
|
|
* before each read. */
|
|
rtc->write(rtc, RTC_BANK1_RAM_ADDR,
|
|
(pos - NVRAM_TOTAL_SZ_BANK0));
|
|
#endif
|
|
*buf++ = rtc->read(rtc, RTC_BANK1_RAM_DATA_PORT);
|
|
pos++;
|
|
}
|
|
|
|
#ifndef CONFIG_RTC_DRV_DS1685
|
|
/* Disable burst-mode on DS17x85/DS17x87 */
|
|
rtc->write(rtc, RTC_EXT_CTRL_4A,
|
|
(rtc->read(rtc, RTC_EXT_CTRL_4A) &
|
|
~(RTC_CTRL_4A_BME)));
|
|
#endif
|
|
ds1685_rtc_switch_to_bank0(rtc);
|
|
}
|
|
#endif /* !CONFIG_RTC_DRV_DS1689 */
|
|
mutex_unlock(rtc_mutex);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int ds1685_nvram_write(void *priv, unsigned int pos, void *val,
|
|
size_t size)
|
|
{
|
|
struct ds1685_priv *rtc = priv;
|
|
struct mutex *rtc_mutex = &rtc->dev->ops_lock;
|
|
ssize_t count;
|
|
u8 *buf = val;
|
|
int err;
|
|
|
|
err = mutex_lock_interruptible(rtc_mutex);
|
|
if (err)
|
|
return err;
|
|
|
|
ds1685_rtc_switch_to_bank0(rtc);
|
|
|
|
/* Write NVRAM in time and bank0 registers. */
|
|
for (count = 0; size > 0 && pos < NVRAM_TOTAL_SZ_BANK0;
|
|
count++, size--)
|
|
if (count < NVRAM_SZ_TIME)
|
|
rtc->write(rtc, (NVRAM_TIME_BASE + pos++),
|
|
*buf++);
|
|
else
|
|
rtc->write(rtc, (NVRAM_BANK0_BASE), *buf++);
|
|
|
|
#ifndef CONFIG_RTC_DRV_DS1689
|
|
if (size > 0) {
|
|
ds1685_rtc_switch_to_bank1(rtc);
|
|
|
|
#ifndef CONFIG_RTC_DRV_DS1685
|
|
/* Enable burst-mode on DS17x85/DS17x87 */
|
|
rtc->write(rtc, RTC_EXT_CTRL_4A,
|
|
(rtc->read(rtc, RTC_EXT_CTRL_4A) |
|
|
RTC_CTRL_4A_BME));
|
|
|
|
/* We need one write to RTC_BANK1_RAM_ADDR_LSB to start
|
|
* writing with burst-mode */
|
|
rtc->write(rtc, RTC_BANK1_RAM_ADDR_LSB,
|
|
(pos - NVRAM_TOTAL_SZ_BANK0));
|
|
#endif
|
|
|
|
/* Write NVRAM in bank1 registers. */
|
|
for (count = 0; size > 0 && pos < NVRAM_TOTAL_SZ;
|
|
count++, size--) {
|
|
#ifdef CONFIG_RTC_DRV_DS1685
|
|
/* DS1685/DS1687 has to write to RTC_BANK1_RAM_ADDR
|
|
* before each read. */
|
|
rtc->write(rtc, RTC_BANK1_RAM_ADDR,
|
|
(pos - NVRAM_TOTAL_SZ_BANK0));
|
|
#endif
|
|
rtc->write(rtc, RTC_BANK1_RAM_DATA_PORT, *buf++);
|
|
pos++;
|
|
}
|
|
|
|
#ifndef CONFIG_RTC_DRV_DS1685
|
|
/* Disable burst-mode on DS17x85/DS17x87 */
|
|
rtc->write(rtc, RTC_EXT_CTRL_4A,
|
|
(rtc->read(rtc, RTC_EXT_CTRL_4A) &
|
|
~(RTC_CTRL_4A_BME)));
|
|
#endif
|
|
ds1685_rtc_switch_to_bank0(rtc);
|
|
}
|
|
#endif /* !CONFIG_RTC_DRV_DS1689 */
|
|
mutex_unlock(rtc_mutex);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* ----------------------------------------------------------------------- */
|
|
/* SysFS interface */
|
|
|
|
/**
|
|
* ds1685_rtc_sysfs_battery_show - sysfs file for main battery status.
|
|
* @dev: pointer to device structure.
|
|
* @attr: pointer to device_attribute structure.
|
|
* @buf: pointer to char array to hold the output.
|
|
*/
|
|
static ssize_t
|
|
ds1685_rtc_sysfs_battery_show(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct ds1685_priv *rtc = dev_get_drvdata(dev->parent);
|
|
u8 ctrld;
|
|
|
|
ctrld = rtc->read(rtc, RTC_CTRL_D);
|
|
|
|
return sprintf(buf, "%s\n",
|
|
(ctrld & RTC_CTRL_D_VRT) ? "ok" : "not ok or N/A");
|
|
}
|
|
static DEVICE_ATTR(battery, S_IRUGO, ds1685_rtc_sysfs_battery_show, NULL);
|
|
|
|
/**
|
|
* ds1685_rtc_sysfs_auxbatt_show - sysfs file for aux battery status.
|
|
* @dev: pointer to device structure.
|
|
* @attr: pointer to device_attribute structure.
|
|
* @buf: pointer to char array to hold the output.
|
|
*/
|
|
static ssize_t
|
|
ds1685_rtc_sysfs_auxbatt_show(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct ds1685_priv *rtc = dev_get_drvdata(dev->parent);
|
|
u8 ctrl4a;
|
|
|
|
ds1685_rtc_switch_to_bank1(rtc);
|
|
ctrl4a = rtc->read(rtc, RTC_EXT_CTRL_4A);
|
|
ds1685_rtc_switch_to_bank0(rtc);
|
|
|
|
return sprintf(buf, "%s\n",
|
|
(ctrl4a & RTC_CTRL_4A_VRT2) ? "ok" : "not ok or N/A");
|
|
}
|
|
static DEVICE_ATTR(auxbatt, S_IRUGO, ds1685_rtc_sysfs_auxbatt_show, NULL);
|
|
|
|
/**
|
|
* ds1685_rtc_sysfs_serial_show - sysfs file for silicon serial number.
|
|
* @dev: pointer to device structure.
|
|
* @attr: pointer to device_attribute structure.
|
|
* @buf: pointer to char array to hold the output.
|
|
*/
|
|
static ssize_t
|
|
ds1685_rtc_sysfs_serial_show(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct ds1685_priv *rtc = dev_get_drvdata(dev->parent);
|
|
u8 ssn[8];
|
|
|
|
ds1685_rtc_switch_to_bank1(rtc);
|
|
ds1685_rtc_get_ssn(rtc, ssn);
|
|
ds1685_rtc_switch_to_bank0(rtc);
|
|
|
|
return sprintf(buf, "%8phC\n", ssn);
|
|
}
|
|
static DEVICE_ATTR(serial, S_IRUGO, ds1685_rtc_sysfs_serial_show, NULL);
|
|
|
|
/*
|
|
* struct ds1685_rtc_sysfs_misc_attrs - list for misc RTC features.
|
|
*/
|
|
static struct attribute*
|
|
ds1685_rtc_sysfs_misc_attrs[] = {
|
|
&dev_attr_battery.attr,
|
|
&dev_attr_auxbatt.attr,
|
|
&dev_attr_serial.attr,
|
|
NULL,
|
|
};
|
|
|
|
/*
|
|
* struct ds1685_rtc_sysfs_misc_grp - attr group for misc RTC features.
|
|
*/
|
|
static const struct attribute_group
|
|
ds1685_rtc_sysfs_misc_grp = {
|
|
.name = "misc",
|
|
.attrs = ds1685_rtc_sysfs_misc_attrs,
|
|
};
|
|
|
|
/* ----------------------------------------------------------------------- */
|
|
/* Driver Probe/Removal */
|
|
|
|
/**
|
|
* ds1685_rtc_probe - initializes rtc driver.
|
|
* @pdev: pointer to platform_device structure.
|
|
*/
|
|
static int
|
|
ds1685_rtc_probe(struct platform_device *pdev)
|
|
{
|
|
struct rtc_device *rtc_dev;
|
|
struct ds1685_priv *rtc;
|
|
struct ds1685_rtc_platform_data *pdata;
|
|
u8 ctrla, ctrlb, hours;
|
|
unsigned char am_pm;
|
|
int ret = 0;
|
|
struct nvmem_config nvmem_cfg = {
|
|
.name = "ds1685_nvram",
|
|
.size = NVRAM_TOTAL_SZ,
|
|
.reg_read = ds1685_nvram_read,
|
|
.reg_write = ds1685_nvram_write,
|
|
};
|
|
|
|
/* Get the platform data. */
|
|
pdata = (struct ds1685_rtc_platform_data *) pdev->dev.platform_data;
|
|
if (!pdata)
|
|
return -ENODEV;
|
|
|
|
/* Allocate memory for the rtc device. */
|
|
rtc = devm_kzalloc(&pdev->dev, sizeof(*rtc), GFP_KERNEL);
|
|
if (!rtc)
|
|
return -ENOMEM;
|
|
|
|
/* Setup resources and access functions */
|
|
switch (pdata->access_type) {
|
|
case ds1685_reg_direct:
|
|
rtc->regs = devm_platform_ioremap_resource(pdev, 0);
|
|
if (IS_ERR(rtc->regs))
|
|
return PTR_ERR(rtc->regs);
|
|
rtc->read = ds1685_read;
|
|
rtc->write = ds1685_write;
|
|
break;
|
|
case ds1685_reg_indirect:
|
|
rtc->regs = devm_platform_ioremap_resource(pdev, 0);
|
|
if (IS_ERR(rtc->regs))
|
|
return PTR_ERR(rtc->regs);
|
|
rtc->data = devm_platform_ioremap_resource(pdev, 1);
|
|
if (IS_ERR(rtc->data))
|
|
return PTR_ERR(rtc->data);
|
|
rtc->read = ds1685_indirect_read;
|
|
rtc->write = ds1685_indirect_write;
|
|
break;
|
|
}
|
|
|
|
if (!rtc->read || !rtc->write)
|
|
return -ENXIO;
|
|
|
|
/* Get the register step size. */
|
|
if (pdata->regstep > 0)
|
|
rtc->regstep = pdata->regstep;
|
|
else
|
|
rtc->regstep = 1;
|
|
|
|
/* Platform pre-shutdown function, if defined. */
|
|
if (pdata->plat_prepare_poweroff)
|
|
rtc->prepare_poweroff = pdata->plat_prepare_poweroff;
|
|
|
|
/* Platform wake_alarm function, if defined. */
|
|
if (pdata->plat_wake_alarm)
|
|
rtc->wake_alarm = pdata->plat_wake_alarm;
|
|
|
|
/* Platform post_ram_clear function, if defined. */
|
|
if (pdata->plat_post_ram_clear)
|
|
rtc->post_ram_clear = pdata->plat_post_ram_clear;
|
|
|
|
/* set the driver data. */
|
|
platform_set_drvdata(pdev, rtc);
|
|
|
|
/* Turn the oscillator on if is not already on (DV1 = 1). */
|
|
ctrla = rtc->read(rtc, RTC_CTRL_A);
|
|
if (!(ctrla & RTC_CTRL_A_DV1))
|
|
ctrla |= RTC_CTRL_A_DV1;
|
|
|
|
/* Enable the countdown chain (DV2 = 0) */
|
|
ctrla &= ~(RTC_CTRL_A_DV2);
|
|
|
|
/* Clear RS3-RS0 in Control A. */
|
|
ctrla &= ~(RTC_CTRL_A_RS_MASK);
|
|
|
|
/*
|
|
* All done with Control A. Switch to Bank 1 for the remainder of
|
|
* the RTC setup so we have access to the extended functions.
|
|
*/
|
|
ctrla |= RTC_CTRL_A_DV0;
|
|
rtc->write(rtc, RTC_CTRL_A, ctrla);
|
|
|
|
/* Default to 32768kHz output. */
|
|
rtc->write(rtc, RTC_EXT_CTRL_4B,
|
|
(rtc->read(rtc, RTC_EXT_CTRL_4B) | RTC_CTRL_4B_E32K));
|
|
|
|
/* Set the SET bit in Control B so we can do some housekeeping. */
|
|
rtc->write(rtc, RTC_CTRL_B,
|
|
(rtc->read(rtc, RTC_CTRL_B) | RTC_CTRL_B_SET));
|
|
|
|
/* Read Ext Ctrl 4A and check the INCR bit to avoid a lockout. */
|
|
while (rtc->read(rtc, RTC_EXT_CTRL_4A) & RTC_CTRL_4A_INCR)
|
|
cpu_relax();
|
|
|
|
/*
|
|
* If the platform supports BCD mode, then set DM=0 in Control B.
|
|
* Otherwise, set DM=1 for BIN mode.
|
|
*/
|
|
ctrlb = rtc->read(rtc, RTC_CTRL_B);
|
|
if (pdata->bcd_mode)
|
|
ctrlb &= ~(RTC_CTRL_B_DM);
|
|
else
|
|
ctrlb |= RTC_CTRL_B_DM;
|
|
rtc->bcd_mode = pdata->bcd_mode;
|
|
|
|
/*
|
|
* Disable Daylight Savings Time (DSE = 0).
|
|
* The RTC has hardcoded timezone information that is rendered
|
|
* obselete. We'll let the OS deal with DST settings instead.
|
|
*/
|
|
if (ctrlb & RTC_CTRL_B_DSE)
|
|
ctrlb &= ~(RTC_CTRL_B_DSE);
|
|
|
|
/* Force 24-hour mode (2412 = 1). */
|
|
if (!(ctrlb & RTC_CTRL_B_2412)) {
|
|
/* Reinitialize the time hours. */
|
|
hours = rtc->read(rtc, RTC_HRS);
|
|
am_pm = hours & RTC_HRS_AMPM_MASK;
|
|
hours = ds1685_rtc_bcd2bin(rtc, hours, RTC_HRS_12_BCD_MASK,
|
|
RTC_HRS_12_BIN_MASK);
|
|
hours = ((hours == 12) ? 0 : ((am_pm) ? hours + 12 : hours));
|
|
|
|
/* Enable 24-hour mode. */
|
|
ctrlb |= RTC_CTRL_B_2412;
|
|
|
|
/* Write back to Control B, including DM & DSE bits. */
|
|
rtc->write(rtc, RTC_CTRL_B, ctrlb);
|
|
|
|
/* Write the time hours back. */
|
|
rtc->write(rtc, RTC_HRS,
|
|
ds1685_rtc_bin2bcd(rtc, hours,
|
|
RTC_HRS_24_BIN_MASK,
|
|
RTC_HRS_24_BCD_MASK));
|
|
|
|
/* Reinitialize the alarm hours. */
|
|
hours = rtc->read(rtc, RTC_HRS_ALARM);
|
|
am_pm = hours & RTC_HRS_AMPM_MASK;
|
|
hours = ds1685_rtc_bcd2bin(rtc, hours, RTC_HRS_12_BCD_MASK,
|
|
RTC_HRS_12_BIN_MASK);
|
|
hours = ((hours == 12) ? 0 : ((am_pm) ? hours + 12 : hours));
|
|
|
|
/* Write the alarm hours back. */
|
|
rtc->write(rtc, RTC_HRS_ALARM,
|
|
ds1685_rtc_bin2bcd(rtc, hours,
|
|
RTC_HRS_24_BIN_MASK,
|
|
RTC_HRS_24_BCD_MASK));
|
|
} else {
|
|
/* 24-hour mode is already set, so write Control B back. */
|
|
rtc->write(rtc, RTC_CTRL_B, ctrlb);
|
|
}
|
|
|
|
/* Unset the SET bit in Control B so the RTC can update. */
|
|
rtc->write(rtc, RTC_CTRL_B,
|
|
(rtc->read(rtc, RTC_CTRL_B) & ~(RTC_CTRL_B_SET)));
|
|
|
|
/* Check the main battery. */
|
|
if (!(rtc->read(rtc, RTC_CTRL_D) & RTC_CTRL_D_VRT))
|
|
dev_warn(&pdev->dev,
|
|
"Main battery is exhausted! RTC may be invalid!\n");
|
|
|
|
/* Check the auxillary battery. It is optional. */
|
|
if (!(rtc->read(rtc, RTC_EXT_CTRL_4A) & RTC_CTRL_4A_VRT2))
|
|
dev_warn(&pdev->dev,
|
|
"Aux battery is exhausted or not available.\n");
|
|
|
|
/* Read Ctrl B and clear PIE/AIE/UIE. */
|
|
rtc->write(rtc, RTC_CTRL_B,
|
|
(rtc->read(rtc, RTC_CTRL_B) & ~(RTC_CTRL_B_PAU_MASK)));
|
|
|
|
/* Reading Ctrl C auto-clears PF/AF/UF. */
|
|
rtc->read(rtc, RTC_CTRL_C);
|
|
|
|
/* Read Ctrl 4B and clear RIE/WIE/KSE. */
|
|
rtc->write(rtc, RTC_EXT_CTRL_4B,
|
|
(rtc->read(rtc, RTC_EXT_CTRL_4B) & ~(RTC_CTRL_4B_RWK_MASK)));
|
|
|
|
/* Clear RF/WF/KF in Ctrl 4A. */
|
|
rtc->write(rtc, RTC_EXT_CTRL_4A,
|
|
(rtc->read(rtc, RTC_EXT_CTRL_4A) & ~(RTC_CTRL_4A_RWK_MASK)));
|
|
|
|
/*
|
|
* Re-enable KSE to handle power button events. We do not enable
|
|
* WIE or RIE by default.
|
|
*/
|
|
rtc->write(rtc, RTC_EXT_CTRL_4B,
|
|
(rtc->read(rtc, RTC_EXT_CTRL_4B) | RTC_CTRL_4B_KSE));
|
|
|
|
rtc_dev = devm_rtc_allocate_device(&pdev->dev);
|
|
if (IS_ERR(rtc_dev))
|
|
return PTR_ERR(rtc_dev);
|
|
|
|
rtc_dev->ops = &ds1685_rtc_ops;
|
|
|
|
/* Century bit is useless because leap year fails in 1900 and 2100 */
|
|
rtc_dev->range_min = RTC_TIMESTAMP_BEGIN_2000;
|
|
rtc_dev->range_max = RTC_TIMESTAMP_END_2099;
|
|
|
|
/* Maximum periodic rate is 8192Hz (0.122070ms). */
|
|
rtc_dev->max_user_freq = RTC_MAX_USER_FREQ;
|
|
|
|
/* See if the platform doesn't support UIE. */
|
|
if (pdata->uie_unsupported)
|
|
clear_bit(RTC_FEATURE_UPDATE_INTERRUPT, rtc_dev->features);
|
|
|
|
rtc->dev = rtc_dev;
|
|
|
|
/*
|
|
* Fetch the IRQ and setup the interrupt handler.
|
|
*
|
|
* Not all platforms have the IRQF pin tied to something. If not, the
|
|
* RTC will still set the *IE / *F flags and raise IRQF in ctrlc, but
|
|
* there won't be an automatic way of notifying the kernel about it,
|
|
* unless ctrlc is explicitly polled.
|
|
*/
|
|
rtc->irq_num = platform_get_irq(pdev, 0);
|
|
if (rtc->irq_num <= 0) {
|
|
clear_bit(RTC_FEATURE_ALARM, rtc_dev->features);
|
|
} else {
|
|
/* Request an IRQ. */
|
|
ret = devm_request_threaded_irq(&pdev->dev, rtc->irq_num,
|
|
NULL, ds1685_rtc_irq_handler,
|
|
IRQF_SHARED | IRQF_ONESHOT,
|
|
pdev->name, pdev);
|
|
|
|
/* Check to see if something came back. */
|
|
if (unlikely(ret)) {
|
|
dev_warn(&pdev->dev,
|
|
"RTC interrupt not available\n");
|
|
rtc->irq_num = 0;
|
|
}
|
|
}
|
|
|
|
/* Setup complete. */
|
|
ds1685_rtc_switch_to_bank0(rtc);
|
|
|
|
ret = rtc_add_group(rtc_dev, &ds1685_rtc_sysfs_misc_grp);
|
|
if (ret)
|
|
return ret;
|
|
|
|
nvmem_cfg.priv = rtc;
|
|
ret = devm_rtc_nvmem_register(rtc_dev, &nvmem_cfg);
|
|
if (ret)
|
|
return ret;
|
|
|
|
return devm_rtc_register_device(rtc_dev);
|
|
}
|
|
|
|
/**
|
|
* ds1685_rtc_remove - removes rtc driver.
|
|
* @pdev: pointer to platform_device structure.
|
|
*/
|
|
static int
|
|
ds1685_rtc_remove(struct platform_device *pdev)
|
|
{
|
|
struct ds1685_priv *rtc = platform_get_drvdata(pdev);
|
|
|
|
/* Read Ctrl B and clear PIE/AIE/UIE. */
|
|
rtc->write(rtc, RTC_CTRL_B,
|
|
(rtc->read(rtc, RTC_CTRL_B) &
|
|
~(RTC_CTRL_B_PAU_MASK)));
|
|
|
|
/* Reading Ctrl C auto-clears PF/AF/UF. */
|
|
rtc->read(rtc, RTC_CTRL_C);
|
|
|
|
/* Read Ctrl 4B and clear RIE/WIE/KSE. */
|
|
rtc->write(rtc, RTC_EXT_CTRL_4B,
|
|
(rtc->read(rtc, RTC_EXT_CTRL_4B) &
|
|
~(RTC_CTRL_4B_RWK_MASK)));
|
|
|
|
/* Manually clear RF/WF/KF in Ctrl 4A. */
|
|
rtc->write(rtc, RTC_EXT_CTRL_4A,
|
|
(rtc->read(rtc, RTC_EXT_CTRL_4A) &
|
|
~(RTC_CTRL_4A_RWK_MASK)));
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* ds1685_rtc_driver - rtc driver properties.
|
|
*/
|
|
static struct platform_driver ds1685_rtc_driver = {
|
|
.driver = {
|
|
.name = "rtc-ds1685",
|
|
},
|
|
.probe = ds1685_rtc_probe,
|
|
.remove = ds1685_rtc_remove,
|
|
};
|
|
module_platform_driver(ds1685_rtc_driver);
|
|
/* ----------------------------------------------------------------------- */
|
|
|
|
|
|
/* ----------------------------------------------------------------------- */
|
|
/* Poweroff function */
|
|
|
|
/**
|
|
* ds1685_rtc_poweroff - uses the RTC chip to power the system off.
|
|
* @pdev: pointer to platform_device structure.
|
|
*/
|
|
void __noreturn
|
|
ds1685_rtc_poweroff(struct platform_device *pdev)
|
|
{
|
|
u8 ctrla, ctrl4a, ctrl4b;
|
|
struct ds1685_priv *rtc;
|
|
|
|
/* Check for valid RTC data, else, spin forever. */
|
|
if (unlikely(!pdev)) {
|
|
pr_emerg("platform device data not available, spinning forever ...\n");
|
|
while(1);
|
|
unreachable();
|
|
} else {
|
|
/* Get the rtc data. */
|
|
rtc = platform_get_drvdata(pdev);
|
|
|
|
/*
|
|
* Disable our IRQ. We're powering down, so we're not
|
|
* going to worry about cleaning up. Most of that should
|
|
* have been taken care of by the shutdown scripts and this
|
|
* is the final function call.
|
|
*/
|
|
if (rtc->irq_num)
|
|
disable_irq_nosync(rtc->irq_num);
|
|
|
|
/* Oscillator must be on and the countdown chain enabled. */
|
|
ctrla = rtc->read(rtc, RTC_CTRL_A);
|
|
ctrla |= RTC_CTRL_A_DV1;
|
|
ctrla &= ~(RTC_CTRL_A_DV2);
|
|
rtc->write(rtc, RTC_CTRL_A, ctrla);
|
|
|
|
/*
|
|
* Read Control 4A and check the status of the auxillary
|
|
* battery. This must be present and working (VRT2 = 1)
|
|
* for wakeup and kickstart functionality to be useful.
|
|
*/
|
|
ds1685_rtc_switch_to_bank1(rtc);
|
|
ctrl4a = rtc->read(rtc, RTC_EXT_CTRL_4A);
|
|
if (ctrl4a & RTC_CTRL_4A_VRT2) {
|
|
/* Clear all of the interrupt flags on Control 4A. */
|
|
ctrl4a &= ~(RTC_CTRL_4A_RWK_MASK);
|
|
rtc->write(rtc, RTC_EXT_CTRL_4A, ctrl4a);
|
|
|
|
/*
|
|
* The auxillary battery is present and working.
|
|
* Enable extended functions (ABE=1), enable
|
|
* wake-up (WIE=1), and enable kickstart (KSE=1)
|
|
* in Control 4B.
|
|
*/
|
|
ctrl4b = rtc->read(rtc, RTC_EXT_CTRL_4B);
|
|
ctrl4b |= (RTC_CTRL_4B_ABE | RTC_CTRL_4B_WIE |
|
|
RTC_CTRL_4B_KSE);
|
|
rtc->write(rtc, RTC_EXT_CTRL_4B, ctrl4b);
|
|
}
|
|
|
|
/* Set PAB to 1 in Control 4A to power the system down. */
|
|
dev_warn(&pdev->dev, "Powerdown.\n");
|
|
msleep(20);
|
|
rtc->write(rtc, RTC_EXT_CTRL_4A,
|
|
(ctrl4a | RTC_CTRL_4A_PAB));
|
|
|
|
/* Spin ... we do not switch back to bank0. */
|
|
while(1);
|
|
unreachable();
|
|
}
|
|
}
|
|
EXPORT_SYMBOL(ds1685_rtc_poweroff);
|
|
/* ----------------------------------------------------------------------- */
|
|
|
|
|
|
MODULE_AUTHOR("Joshua Kinard <kumba@gentoo.org>");
|
|
MODULE_AUTHOR("Matthias Fuchs <matthias.fuchs@esd-electronics.com>");
|
|
MODULE_DESCRIPTION("Dallas/Maxim DS1685/DS1687-series RTC driver");
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_ALIAS("platform:rtc-ds1685");
|