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drivers/rtc/rtc-ab8500.c: use UIE emulation 

RTC: Fix to correct improper implementation of clock update irq
(RTC_UIE) and enable UIE Emulation.

[akpm@linux-foundation.org: checkpatch fixes]
Signed-off-by: Ramesh Chandrasekaran <ramesh.chandrasekaran@stericsson.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Cc: Alessandro Zummo <a.zummo@towertech.it>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Ramesh Chandrasekaran 2012-07-30 14:41:41 -07:00 committed by Linus Torvalds
parent 559a6fc050
commit dc43d4a26b
2 changed files with 15 additions and 1 deletions
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1
drivers/rtc/Kconfig
View File

@ -694,6 +694,7 @@ config RTC_DRV_AB3100
config RTC_DRV_AB8500
tristate "ST-Ericsson AB8500 RTC"
depends on AB8500_CORE
select RTC_INTF_DEV_UIE_EMUL
help
Select this to enable the ST-Ericsson AB8500 power management IC RTC
support. This chip contains a battery- and capacitor-backed RTC.

15
drivers/rtc/rtc-ab8500.c
View File

@ -225,7 +225,8 @@ static int ab8500_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alarm)
{
int retval, i;
unsigned char buf[ARRAY_SIZE(ab8500_rtc_alarm_regs)];
unsigned long mins, secs = 0;
unsigned long mins, secs = 0, cursec = 0;
struct rtc_time curtm;
if (alarm->time.tm_year < (AB8500_RTC_EPOCH - 1900)) {
dev_dbg(dev, "year should be equal to or greater than %d\n",
@ -236,6 +237,18 @@ static int ab8500_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alarm)
/* Get the number of seconds since 1970 */
rtc_tm_to_time(&alarm->time, &secs);
/*
* Check whether alarm is set less than 1min.
* Since our RTC doesn't support alarm resolution less than 1min,
* return -EINVAL, so UIE EMUL can take it up, incase of UIE_ON
*/
ab8500_rtc_read_time(dev, &curtm); /* Read current time */
rtc_tm_to_time(&curtm, &cursec);
if ((secs - cursec) < 59) {
dev_dbg(dev, "Alarm less than 1 minute not supported\r\n");
return -EINVAL;
}
/*
* Convert it to the number of seconds since 01-01-2000 00:00:00, since
* we only have a small counter in the RTC.