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path: root/drivers/rtc/rtc-pcf8523.c
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Diffstat (limited to 'drivers/rtc/rtc-pcf8523.c')
-rw-r--r--drivers/rtc/rtc-pcf8523.c11
1 files changed, 11 insertions, 0 deletions
diff --git a/drivers/rtc/rtc-pcf8523.c b/drivers/rtc/rtc-pcf8523.c
index e7ebcc0b7..988566caa 100644
--- a/drivers/rtc/rtc-pcf8523.c
+++ b/drivers/rtc/rtc-pcf8523.c
@@ -219,6 +219,17 @@ static int pcf8523_rtc_set_time(struct device *dev, struct rtc_time *tm)
u8 regs[8];
int err;
+ /*
+ * The hardware can only store values between 0 and 99 in it's YEAR
+ * register (with 99 overflowing to 0 on increment).
+ * After 2100-02-28 we could start interpreting the year to be in the
+ * interval [2100, 2199], but there is no path to switch in a smooth way
+ * because the chip handles YEAR=0x00 (and the out-of-spec
+ * YEAR=0xa0) as a leap year, but 2100 isn't.
+ */
+ if (tm->tm_year < 100 || tm->tm_year >= 200)
+ return -EINVAL;
+
err = pcf8523_stop_rtc(client);
if (err < 0)
return err;