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drivers/rtc/rtc-isl12057.c: add proper handling of oscillator failure bit

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As suggested by Uwe, instead of clearing oscillator failure bit
unconditionally at driver load, this patch adds proper handling of the
flag.  The driver now returns -ENODATA when reading time from the device
and oscillator failure bit is set.  The flag is now cleared only when the
a new time value is pushed to the device.

Signed-off-by: Arnaud Ebalard <arno@natisbad.org>
Reported-by: Uwe Kleine-König <uwe@kleine-koenig.org>
Acked-by: Uwe Kleine-König <uwe@kleine-koenig.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Alessandro Zummo <a.zummo@towertech.it>
Cc: Peter Huewe <peter.huewe@infineon.com>
Cc: Linus Walleij <linus.walleij@linaro.org>
Cc: Thierry Reding <treding@nvidia.com>
Cc: Mark Brown <broonie@kernel.org>
Cc: Grant Likely <grant.likely@linaro.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Arnaud Ebalard 2014-12-10 15:54:08 -08:00 committed by Linus Torvalds
parent b5f4184d14
commit 10df1e6787
1 changed files with 33 additions and 14 deletions
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47
drivers/rtc/rtc-isl12057.c
View file

@ -164,17 +164,32 @@ static int isl12057_rtc_read_time(struct device *dev, struct rtc_time *tm)
{
struct isl12057_rtc_data *data = dev_get_drvdata(dev);
u8 regs[ISL12057_RTC_SEC_LEN];
unsigned int sr;
int ret;
mutex_lock(&data->lock);
ret = regmap_read(data->regmap, ISL12057_REG_SR, &sr);
if (ret) {
dev_err(dev, "%s: unable to read oscillator status flag\n",
__func__);
goto out;
} else {
if (sr & ISL12057_REG_SR_OSF) {
ret = -ENODATA;
goto out;
}
}
ret = regmap_bulk_read(data->regmap, ISL12057_REG_RTC_SC, regs,
ISL12057_RTC_SEC_LEN);
if (ret)
dev_err(dev, "%s: unable to read RTC time\n", __func__);
out:
mutex_unlock(&data->lock);
if (ret) {
dev_err(dev, "%s: RTC read failed\n", __func__);
if (ret)
return ret;
}
isl12057_rtc_regs_to_tm(tm, regs);
@ -194,10 +209,22 @@ static int isl12057_rtc_set_time(struct device *dev, struct rtc_time *tm)
mutex_lock(&data->lock);
ret = regmap_bulk_write(data->regmap, ISL12057_REG_RTC_SC, regs,
ISL12057_RTC_SEC_LEN);
mutex_unlock(&data->lock);
if (ret) {
dev_err(dev, "%s: writing RTC time failed\n", __func__);
goto out;
}
if (ret)
dev_err(dev, "%s: RTC write failed\n", __func__);
/*
* Now that RTC time has been updated, let's clear oscillator
* failure flag, if needed.
*/
ret = regmap_update_bits(data->regmap, ISL12057_REG_SR,
ISL12057_REG_SR_OSF, 0);
if (ret < 0)
dev_err(dev, "Unable to clear oscillator failure bit\n");
out:
mutex_unlock(&data->lock);
return ret;
}
@ -219,14 +246,6 @@ static int isl12057_check_rtc_status(struct device *dev, struct regmap *regmap)
return ret;
}
/* Clear oscillator failure bit if needed */
ret = regmap_update_bits(regmap, ISL12057_REG_SR,
ISL12057_REG_SR_OSF, 0);
if (ret < 0) {
dev_err(dev, "Unable to clear oscillator failure bit\n");
return ret;
}
/* Clear alarm bit if needed */
ret = regmap_update_bits(regmap, ISL12057_REG_SR,
ISL12057_REG_SR_A1F, 0);