[PATCH] rtc: Use time64_t variables to set time/alarm from sysfs

[Baolin Wang]

Use time64_t variables and related APIs for sysfs interfaces to
support setting time or alarm after the year 2038 on 32-bit system.

Signed-off-by: Baolin Wang <baolin.w...@linaro.org>
---
 drivers/rtc/rtc-sysfs.c |   25 +++++++++++++------------
 1 file changed, 13 insertions(+), 12 deletions(-)

diff --git a/drivers/rtc/rtc-sysfs.c b/drivers/rtc/rtc-sysfs.c
index e364550..92ff2ed 100644
--- a/drivers/rtc/rtc-sysfs.c
+++ b/drivers/rtc/rtc-sysfs.c
@@ -72,9 +72,10 @@
 
        retval = rtc_read_time(to_rtc_device(dev), &tm);
        if (retval == 0) {
-               unsigned long time;
-               rtc_tm_to_time(&tm, &time);
-               retval = sprintf(buf, "%lu\n", time);
+               time64_t time;
+
+               time = rtc_tm_to_time64(&tm);
+               retval = sprintf(buf, "%lld\n", time);
        }
 
        return retval;
@@ -132,7 +133,7 @@
 wakealarm_show(struct device *dev, struct device_attribute *attr, char *buf)
 {
        ssize_t retval;
-       unsigned long alarm;
+       time64_t alarm;
        struct rtc_wkalrm alm;
 
        /* Don't show disabled alarms.  For uniformity, RTC alarms are
@@ -145,8 +146,8 @@
         */
        retval = rtc_read_alarm(to_rtc_device(dev), &alm);
        if (retval == 0 && alm.enabled) {
-               rtc_tm_to_time(&alm.time, &alarm);
-               retval = sprintf(buf, "%lu\n", alarm);
+               alarm = rtc_tm_to_time64(&alm.time);
+               retval = sprintf(buf, "%lld\n", alarm);
        }
 
        return retval;
@@ -157,8 +158,8 @@
                const char *buf, size_t n)
 {
        ssize_t retval;
-       unsigned long now, alarm;
-       unsigned long push = 0;
+       time64_t now, alarm;
+       time64_t push = 0;
        struct rtc_wkalrm alm;
        struct rtc_device *rtc = to_rtc_device(dev);
        const char *buf_ptr;
@@ -170,7 +171,7 @@
        retval = rtc_read_time(rtc, &alm.time);
        if (retval < 0)
                return retval;
-       rtc_tm_to_time(&alm.time, &now);
+       now = rtc_tm_to_time64(&alm.time);
 
        buf_ptr = buf;
        if (*buf_ptr == '+') {
@@ -181,7 +182,7 @@
                } else
                        adjust = 1;
        }
-       retval = kstrtoul(buf_ptr, 0, &alarm);
+       retval = kstrtos64(buf_ptr, 0, &alarm);
        if (retval)
                return retval;
        if (adjust) {
@@ -197,7 +198,7 @@
                        return retval;
                if (alm.enabled) {
                        if (push) {
-                               rtc_tm_to_time(&alm.time, &push);
+                               push = rtc_tm_to_time64(&alm.time);
                                alarm += push;
                        } else
                                return -EBUSY;
@@ -212,7 +213,7 @@
                 */
                alarm = now + 300;
        }
-       rtc_time_to_tm(alarm, &alm.time);
+       rtc_time64_to_tm(alarm, &alm.time);
 
        retval = rtc_set_alarm(rtc, &alm);
        return (retval < 0) ? retval : n;
-- 
1.7.9.5