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path: root/drivers/rtc/rtc-sysfs.c
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Diffstat (limited to 'drivers/rtc/rtc-sysfs.c')
-rw-r--r--drivers/rtc/rtc-sysfs.c20
1 files changed, 15 insertions, 5 deletions
diff --git a/drivers/rtc/rtc-sysfs.c b/drivers/rtc/rtc-sysfs.c
index b70e2bb6364..4b26f8672b2 100644
--- a/drivers/rtc/rtc-sysfs.c
+++ b/drivers/rtc/rtc-sysfs.c
@@ -164,6 +164,7 @@ rtc_sysfs_set_wakealarm(struct device *dev, struct device_attribute *attr,
{
ssize_t retval;
unsigned long now, alarm;
+ unsigned long push = 0;
struct rtc_wkalrm alm;
struct rtc_device *rtc = to_rtc_device(dev);
char *buf_ptr;
@@ -180,13 +181,17 @@ rtc_sysfs_set_wakealarm(struct device *dev, struct device_attribute *attr,
buf_ptr = (char *)buf;
if (*buf_ptr == '+') {
buf_ptr++;
- adjust = 1;
+ if (*buf_ptr == '=') {
+ buf_ptr++;
+ push = 1;
+ } else
+ adjust = 1;
}
alarm = simple_strtoul(buf_ptr, NULL, 0);
if (adjust) {
alarm += now;
}
- if (alarm > now) {
+ if (alarm > now || push) {
/* Avoid accidentally clobbering active alarms; we can't
* entirely prevent that here, without even the minimal
* locking from the /dev/rtcN api.
@@ -194,9 +199,14 @@ rtc_sysfs_set_wakealarm(struct device *dev, struct device_attribute *attr,
retval = rtc_read_alarm(rtc, &alm);
if (retval < 0)
return retval;
- if (alm.enabled)
- return -EBUSY;
-
+ if (alm.enabled) {
+ if (push) {
+ rtc_tm_to_time(&alm.time, &push);
+ alarm += push;
+ } else
+ return -EBUSY;
+ } else if (push)
+ return -EINVAL;
alm.enabled = 1;
} else {
alm.enabled = 0;