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path: root/drivers/rtc/rtc-cmos.c
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Diffstat (limited to 'drivers/rtc/rtc-cmos.c')
-rw-r--r--drivers/rtc/rtc-cmos.c75
1 files changed, 72 insertions, 3 deletions
diff --git a/drivers/rtc/rtc-cmos.c b/drivers/rtc/rtc-cmos.c
index 38aa8e1906c2..f4a96dbdabf2 100644
--- a/drivers/rtc/rtc-cmos.c
+++ b/drivers/rtc/rtc-cmos.c
@@ -332,14 +332,86 @@ static void cmos_irq_disable(struct cmos_rtc *cmos, unsigned char mask)
cmos_checkintr(cmos, rtc_control);
}
+static int cmos_validate_alarm(struct device *dev, struct rtc_wkalrm *t)
+{
+ struct cmos_rtc *cmos = dev_get_drvdata(dev);
+ struct rtc_time now;
+
+ cmos_read_time(dev, &now);
+
+ if (!cmos->day_alrm) {
+ time64_t t_max_date;
+ time64_t t_alrm;
+
+ t_max_date = rtc_tm_to_time64(&now);
+ t_max_date += 24 * 60 * 60 - 1;
+ t_alrm = rtc_tm_to_time64(&t->time);
+ if (t_alrm > t_max_date) {
+ dev_err(dev,
+ "Alarms can be up to one day in the future\n");
+ return -EINVAL;
+ }
+ } else if (!cmos->mon_alrm) {
+ struct rtc_time max_date = now;
+ time64_t t_max_date;
+ time64_t t_alrm;
+ int max_mday;
+
+ if (max_date.tm_mon == 11) {
+ max_date.tm_mon = 0;
+ max_date.tm_year += 1;
+ } else {
+ max_date.tm_mon += 1;
+ }
+ max_mday = rtc_month_days(max_date.tm_mon, max_date.tm_year);
+ if (max_date.tm_mday > max_mday)
+ max_date.tm_mday = max_mday;
+
+ t_max_date = rtc_tm_to_time64(&max_date);
+ t_max_date -= 1;
+ t_alrm = rtc_tm_to_time64(&t->time);
+ if (t_alrm > t_max_date) {
+ dev_err(dev,
+ "Alarms can be up to one month in the future\n");
+ return -EINVAL;
+ }
+ } else {
+ struct rtc_time max_date = now;
+ time64_t t_max_date;
+ time64_t t_alrm;
+ int max_mday;
+
+ max_date.tm_year += 1;
+ max_mday = rtc_month_days(max_date.tm_mon, max_date.tm_year);
+ if (max_date.tm_mday > max_mday)
+ max_date.tm_mday = max_mday;
+
+ t_max_date = rtc_tm_to_time64(&max_date);
+ t_max_date -= 1;
+ t_alrm = rtc_tm_to_time64(&t->time);
+ if (t_alrm > t_max_date) {
+ dev_err(dev,
+ "Alarms can be up to one year in the future\n");
+ return -EINVAL;
+ }
+ }
+
+ return 0;
+}
+
static int cmos_set_alarm(struct device *dev, struct rtc_wkalrm *t)
{
struct cmos_rtc *cmos = dev_get_drvdata(dev);
unsigned char mon, mday, hrs, min, sec, rtc_control;
+ int ret;
if (!is_valid_irq(cmos->irq))
return -EIO;
+ ret = cmos_validate_alarm(dev, t);
+ if (ret < 0)
+ return ret;
+
mon = t->time.tm_mon + 1;
mday = t->time.tm_mday;
hrs = t->time.tm_hour;
@@ -707,9 +779,6 @@ cmos_do_probe(struct device *dev, struct resource *ports, int rtc_irq)
spin_unlock_irq(&rtc_lock);
- /* FIXME:
- * <asm-generic/rtc.h> doesn't know 12-hour mode either.
- */
if (is_valid_irq(rtc_irq) && !(rtc_control & RTC_24H)) {
dev_warn(dev, "only 24-hr supported\n");
retval = -ENXIO;
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