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rtc: pcf8563: handle consequeces of lacking second alarm reg 

To guarantee that a set alarm occurs in the future, the set alarm time
is rounded up to the nearest minute.  Also we cannot handle UIE as it
requires second precision.

Signed-off-by: Jan Kardell <jan.kardell@telliq.com>
Cc: Alessandro Zummo <a.zummo@towertech.it>
Cc: Grant Likely <grant.likely@linaro.org>
Cc: Rob Herring <robh+dt@kernel.org>
Cc: Vincent Donnefort <vdonnefort@gmail.com>
Cc: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Jan Kardell 2014-12-10 15:53:40 -08:00 committed by Linus Torvalds
parent c7aef4f886
commit 599cda555c
1 changed files with 11 additions and 0 deletions
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11
drivers/rtc/rtc-pcf8563.c
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@ -361,6 +361,14 @@ static int pcf8563_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *tm)
struct i2c_client *client = to_i2c_client(dev);
unsigned char buf[4];
int err;
unsigned long alarm_time;
/* The alarm has no seconds, round up to nearest minute */
if (tm->time.tm_sec) {
rtc_tm_to_time(&tm->time, &alarm_time);
alarm_time += 60-tm->time.tm_sec;
rtc_time_to_tm(alarm_time, &tm->time);
}
dev_dbg(dev, "%s, min=%d hour=%d wday=%d mday=%d "
"enabled=%d pending=%d\n", __func__,
@ -435,6 +443,9 @@ static int pcf8563_probe(struct i2c_client *client,
}
/* the pcf8563 alarm only supports a minute accuracy */
pcf8563->rtc->uie_unsupported = 1;
return 0;
}