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

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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>
This commit is contained in:
Benjamin Gaignard 2017-06-19 11:36:22 +02:00 committed by Alexandre Belloni
parent 69c31226fc
commit f4b82d39e4
1 changed files with 8 additions and 11 deletions
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19
drivers/rtc/rtc-st-lpc.c
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@ -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)