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Message-Id: <1499846682-14093-6-git-send-email-benjamin.gaignard@linaro.org>
Date: Wed, 12 Jul 2017 10:04:25 +0200
From: Benjamin Gaignard <benjamin.gaignard@...aro.org>
To: benjamin.gaignard@...aro.org
Cc: linaro-kernel@...ts.linaro.org,
Linus Walleij <linus.walleij@...aro.org>,
Alessandro Zummo <a.zummo@...ertech.it>,
Alexandre Belloni <alexandre.belloni@...e-electrons.com>,
rtc-linux@...glegroups.com, linux-kernel@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org
Subject: [PATCH v2 05/22] rtc: ab8500: stop using rtc deprecated functions
rtc_time_to_tm() and rtc_tm_to_time() are deprecated because they
rely on 32bits variables and that will make rtc break in y2038/2016.
Stop using those two functions to safer 64bits ones.
version 2:
- fix compilation issues by using do_div()
Signed-off-by: Benjamin Gaignard <benjamin.gaignard@...aro.org>
Acked-by: Linus Walleij <linus.walleij@...aro.org>
CC: Linus Walleij <linus.walleij@...aro.org>
CC: Alessandro Zummo <a.zummo@...ertech.it>
CC: Alexandre Belloni <alexandre.belloni@...e-electrons.com>
CC: rtc-linux@...glegroups.com
CC: linux-kernel@...r.kernel.org
CC: linux-arm-kernel@...ts.infradead.org
---
drivers/rtc/rtc-ab8500.c | 53 +++++++++++++++++++++++-------------------------
1 file changed, 25 insertions(+), 28 deletions(-)
diff --git a/drivers/rtc/rtc-ab8500.c b/drivers/rtc/rtc-ab8500.c
index 24a0af6..4b8696f 100644
--- a/drivers/rtc/rtc-ab8500.c
+++ b/drivers/rtc/rtc-ab8500.c
@@ -71,7 +71,7 @@
/* Calculate the seconds from 1970 to 01-01-2000 00:00:00 */
static unsigned long get_elapsed_seconds(int year)
{
- unsigned long secs;
+ unsigned long long secs;
struct rtc_time tm = {
.tm_year = year - 1900,
.tm_mday = 1,
@@ -81,7 +81,7 @@ static unsigned long get_elapsed_seconds(int year)
* This function calculates secs from 1970 and not from
* 1900, even if we supply the offset from year 1900.
*/
- rtc_tm_to_time(&tm, &secs);
+ secs = rtc_tm_to_time64(&tm);
return secs;
}
@@ -89,7 +89,7 @@ static int ab8500_rtc_read_time(struct device *dev, struct rtc_time *tm)
{
unsigned long timeout = jiffies + HZ;
int retval, i;
- unsigned long mins, secs;
+ unsigned long long mins, secs;
unsigned char buf[ARRAY_SIZE(ab8500_rtc_time_regs)];
u8 value;
@@ -130,7 +130,7 @@ static int ab8500_rtc_read_time(struct device *dev, struct rtc_time *tm)
/* Add back the initially subtracted number of seconds */
secs += get_elapsed_seconds(AB8500_RTC_EPOCH);
- rtc_time_to_tm(secs, tm);
+ rtc_time64_to_tm(secs, tm);
return rtc_valid_tm(tm);
}
@@ -138,7 +138,7 @@ static int ab8500_rtc_set_time(struct device *dev, struct rtc_time *tm)
{
int retval, i;
unsigned char buf[ARRAY_SIZE(ab8500_rtc_time_regs)];
- unsigned long no_secs, no_mins, secs = 0;
+ unsigned long long no_secs, secs = 0;
if (tm->tm_year < (AB8500_RTC_EPOCH - 1900)) {
dev_dbg(dev, "year should be equal to or greater than %d\n",
@@ -147,7 +147,7 @@ static int ab8500_rtc_set_time(struct device *dev, struct rtc_time *tm)
}
/* Get the number of seconds since 1970 */
- rtc_tm_to_time(tm, &secs);
+ secs = rtc_tm_to_time64(tm);
/*
* Convert it to the number of seconds since 01-01-2000 00:00:00, since
@@ -155,18 +155,16 @@ static int ab8500_rtc_set_time(struct device *dev, struct rtc_time *tm)
*/
secs -= get_elapsed_seconds(AB8500_RTC_EPOCH);
- no_mins = secs / 60;
-
- no_secs = secs % 60;
+ no_secs = do_div(secs, 60);
/* Make the seconds count as per the RTC resolution */
no_secs = no_secs * COUNTS_PER_SEC;
buf[4] = no_secs & 0xFF;
buf[3] = (no_secs >> 8) & 0xFF;
- buf[2] = no_mins & 0xFF;
- buf[1] = (no_mins >> 8) & 0xFF;
- buf[0] = (no_mins >> 16) & 0xFF;
+ buf[2] = secs & 0xFF;
+ buf[1] = (secs >> 8) & 0xFF;
+ buf[0] = (secs >> 16) & 0xFF;
for (i = 0; i < ARRAY_SIZE(ab8500_rtc_time_regs); i++) {
retval = abx500_set_register_interruptible(dev, AB8500_RTC,
@@ -185,7 +183,7 @@ static int ab8500_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alarm)
int retval, i;
u8 rtc_ctrl, value;
unsigned char buf[ARRAY_SIZE(ab8500_rtc_alarm_regs)];
- unsigned long secs, mins;
+ unsigned long long secs, mins;
/* Check if the alarm is enabled or not */
retval = abx500_get_register_interruptible(dev, AB8500_RTC,
@@ -214,7 +212,7 @@ static int ab8500_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alarm)
/* Add back the initially subtracted number of seconds */
secs += get_elapsed_seconds(AB8500_RTC_EPOCH);
- rtc_time_to_tm(secs, &alarm->time);
+ rtc_time64_to_tm(secs, &alarm->time);
return rtc_valid_tm(&alarm->time);
}
@@ -230,7 +228,7 @@ static int ab8500_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alarm)
{
int retval, i;
unsigned char buf[ARRAY_SIZE(ab8500_rtc_alarm_regs)];
- unsigned long mins, secs = 0, cursec = 0;
+ unsigned long long secs = 0, cursec = 0;
struct rtc_time curtm;
if (alarm->time.tm_year < (AB8500_RTC_EPOCH - 1900)) {
@@ -240,7 +238,7 @@ static int ab8500_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alarm)
}
/* Get the number of seconds since 1970 */
- rtc_tm_to_time(&alarm->time, &secs);
+ secs = rtc_tm_to_time64(&alarm->time);
/*
* Check whether alarm is set less than 1min.
@@ -248,7 +246,7 @@ static int ab8500_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alarm)
* return -EINVAL, so UIE EMUL can take it up, incase of UIE_ON
*/
ab8500_rtc_read_time(dev, &curtm); /* Read current time */
- rtc_tm_to_time(&curtm, &cursec);
+ cursec = rtc_tm_to_time64(&curtm);
if ((secs - cursec) < 59) {
dev_dbg(dev, "Alarm less than 1 minute not supported\r\n");
return -EINVAL;
@@ -260,11 +258,11 @@ static int ab8500_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alarm)
*/
secs -= get_elapsed_seconds(AB8500_RTC_EPOCH);
- mins = secs / 60;
+ do_div(secs, 60);
- buf[2] = mins & 0xFF;
- buf[1] = (mins >> 8) & 0xFF;
- buf[0] = (mins >> 16) & 0xFF;
+ buf[2] = secs & 0xFF;
+ buf[1] = (secs >> 8) & 0xFF;
+ buf[0] = (secs >> 16) & 0xFF;
/* Set the alarm time */
for (i = 0; i < ARRAY_SIZE(ab8500_rtc_alarm_regs); i++) {
@@ -281,7 +279,7 @@ static int ab8540_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alarm)
{
int retval, i;
unsigned char buf[ARRAY_SIZE(ab8540_rtc_alarm_regs)];
- unsigned long mins, secs = 0;
+ unsigned long long secs = 0;
if (alarm->time.tm_year < (AB8500_RTC_EPOCH - 1900)) {
dev_dbg(dev, "year should be equal to or greater than %d\n",
@@ -290,18 +288,17 @@ static int ab8540_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alarm)
}
/* Get the number of seconds since 1970 */
- rtc_tm_to_time(&alarm->time, &secs);
+ secs = rtc_tm_to_time64(&alarm->time);
/*
* Convert it to the number of seconds since 01-01-2000 00:00:00
*/
secs -= get_elapsed_seconds(AB8500_RTC_EPOCH);
- mins = secs / 60;
- buf[3] = secs % 60;
- buf[2] = mins & 0xFF;
- buf[1] = (mins >> 8) & 0xFF;
- buf[0] = (mins >> 16) & 0xFF;
+ buf[3] = do_div(secs, 60);
+ buf[2] = secs & 0xFF;
+ buf[1] = (secs >> 8) & 0xFF;
+ buf[0] = (secs >> 16) & 0xFF;
/* Set the alarm time */
for (i = 0; i < ARRAY_SIZE(ab8540_rtc_alarm_regs); i++) {
--
1.9.1
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