rtc: st-lpc: make it robust against y2038/2106 bug

Make driver use u64 variables and functions to be sure that
it will support dates after year 2038.

Signed-off-by: Benjamin Gaignard <benjamin.gaignard@linaro.org>
Acked-by: Patrice Chotard <patrice.chotard@st.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>

1 files changed, 8 insertions, 11 deletions

diff --git a/drivers/rtc/rtc-st-lpc.c b/drivers/rtc/rtc-st-lpc.c
index 74c0a336ceea..82b0af159a28 100644
--- a/drivers/rtc/rtc-st-lpc.c
+++ b/drivers/rtc/rtc-st-lpc.c
@@ -99,7 +99,7 @@ static int st_rtc_read_time(struct device *dev, struct rtc_time *tm)
 
         lpt = ((unsigned long long)lpt_msb << 32) | lpt_lsb;
         do_div(lpt, rtc->clkrate);
-        rtc_time_to_tm(lpt, tm);
+        rtc_time64_to_tm(lpt, tm);
 
         return 0;
 }
@@ -107,13 +107,10 @@ static int st_rtc_read_time(struct device *dev, struct rtc_time *tm)
 static int st_rtc_set_time(struct device *dev, struct rtc_time *tm)
 {
         struct st_rtc *rtc = dev_get_drvdata(dev);
-        unsigned long long lpt;
-        unsigned long secs, flags;
-        int ret;
+        unsigned long long lpt, secs;
+        unsigned long flags;
 
-        ret = rtc_tm_to_time(tm, &secs);
-        if (ret)
-                return ret;
+        secs = rtc_tm_to_time64(tm);
 
         lpt = (unsigned long long)secs * rtc->clkrate;
 
@@ -161,13 +158,13 @@ static int st_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *t)
 {
         struct st_rtc *rtc = dev_get_drvdata(dev);
         struct rtc_time now;
-        unsigned long now_secs;
-        unsigned long alarm_secs;
+        unsigned long long now_secs;
+        unsigned long long alarm_secs;
         unsigned long long lpa;
 
         st_rtc_read_time(dev, &now);
-        rtc_tm_to_time(&now, &now_secs);
-        rtc_tm_to_time(&t->time, &alarm_secs);
+        now_secs = rtc_tm_to_time64(&now);
+        alarm_secs = rtc_tm_to_time64(&t->time);
 
         /* Invalid alarm time */
         if (now_secs > alarm_secs)