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authorJan Kardell <jan.kardell@telliq.com>2014-12-11 02:53:40 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2014-12-11 04:41:15 +0300
commit599cda555c1bf6ba9b98e28f707f7b27c8276796 (patch)
treecd2391d1617e51469983acee7c62270819a2a1a4 /drivers/rtc/rtc-pcf8563.c
parentc7aef4f88629dcd6efbf9c80c9805625e149c868 (diff)
downloadlinux-599cda555c1bf6ba9b98e28f707f7b27c8276796.tar.xz
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>
Diffstat (limited to 'drivers/rtc/rtc-pcf8563.c')
-rw-r--r--drivers/rtc/rtc-pcf8563.c11
1 files changed, 11 insertions, 0 deletions
diff --git a/drivers/rtc/rtc-pcf8563.c b/drivers/rtc/rtc-pcf8563.c
index 78f76d99bd35..ce6a11bc0fd7 100644
--- a/drivers/rtc/rtc-pcf8563.c
+++ b/drivers/rtc/rtc-pcf8563.c
@@ -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;
}