drivers/rtc/ab3100: Update driver to address y2038/y2106 issues

This driver has a number of y2038/y2106 issues.

This patch resolves them by:

  - Replacing rtc_tm_to_time() with rtc_tm_to_time64()
  - Replacing rtc_time_to_tm() with rtc_time64_to_tm()
  - Changing ab3100_rtc_set_mmss() to use rtc_class_ops's set_mmss64()

After this patch, the driver should not have any remaining
y2038/y2106 issues.

Signed-off-by: Xunlei Pang <pang.xunlei@linaro.org>
Signed-off-by: John Stultz <john.stultz@linaro.org>
Acked-by: Alessandro Zummo <a.zummo@towertech.it>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/1427945681-29972-10-git-send-email-john.stultz@linaro.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>

diff --git a/drivers/rtc/rtc-ab3100.c b/drivers/rtc/rtc-ab3100.c
index 1d0340fdb82021b5326182b4a517c4763b0818e8..9b725c55305859b48f5e6f2ffe45088d4b6f0659 100644 (file)
--- a/drivers/rtc/rtc-ab3100.c
+++ b/drivers/rtc/rtc-ab3100.c
@@ -43,21 +43,21 @@
 /*
  * RTC clock functions and device struct declaration
  */
-static int ab3100_rtc_set_mmss(struct device *dev, unsigned long secs)
+static int ab3100_rtc_set_mmss(struct device *dev, time64_t secs)
 {
        u8 regs[] = {AB3100_TI0, AB3100_TI1, AB3100_TI2,
                     AB3100_TI3, AB3100_TI4, AB3100_TI5};
        unsigned char buf[6];
-       u64 fat_time = (u64) secs * AB3100_RTC_CLOCK_RATE * 2;
+       u64 hw_counter = secs * AB3100_RTC_CLOCK_RATE * 2;
        int err = 0;
        int i;
 
-       buf[0] = (fat_time) & 0xFF;
-       buf[1] = (fat_time >> 8) & 0xFF;
-       buf[2] = (fat_time >> 16) & 0xFF;
-       buf[3] = (fat_time >> 24) & 0xFF;
-       buf[4] = (fat_time >> 32) & 0xFF;
-       buf[5] = (fat_time >> 40) & 0xFF;
+       buf[0] = (hw_counter) & 0xFF;
+       buf[1] = (hw_counter >> 8) & 0xFF;
+       buf[2] = (hw_counter >> 16) & 0xFF;
+       buf[3] = (hw_counter >> 24) & 0xFF;
+       buf[4] = (hw_counter >> 32) & 0xFF;
+       buf[5] = (hw_counter >> 40) & 0xFF;
 
        for (i = 0; i < 6; i++) {
                err = abx500_set_register_interruptible(dev, 0,
@@ -75,7 +75,7 @@ static int ab3100_rtc_set_mmss(struct device *dev, unsigned long secs)
 
 static int ab3100_rtc_read_time(struct device *dev, struct rtc_time *tm)
 {
-       unsigned long time;
+       time64_t time;
        u8 rtcval;
        int err;
 
@@ -88,7 +88,7 @@ static int ab3100_rtc_read_time(struct device *dev, struct rtc_time *tm)
                dev_info(dev, "clock not set (lost power)");
                return -EINVAL;
        } else {
-               u64 fat_time;
+               u64 hw_counter;
                u8 buf[6];
 
                /* Read out time registers */
@@ -98,22 +98,21 @@ static int ab3100_rtc_read_time(struct device *dev, struct rtc_time *tm)
                if (err != 0)
                        return err;
 
-               fat_time = ((u64) buf[5] << 40) | ((u64) buf[4] << 32) |
+               hw_counter = ((u64) buf[5] << 40) | ((u64) buf[4] << 32) |
                        ((u64) buf[3] << 24) | ((u64) buf[2] << 16) |
                        ((u64) buf[1] << 8) | (u64) buf[0];
-               time = (unsigned long) (fat_time /
-                                       (u64) (AB3100_RTC_CLOCK_RATE * 2));
+               time = hw_counter / (u64) (AB3100_RTC_CLOCK_RATE * 2);
        }
 
-       rtc_time_to_tm(time, tm);
+       rtc_time64_to_tm(time, tm);
 
        return rtc_valid_tm(tm);
 }
 
 static int ab3100_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alarm)
 {
-       unsigned long time;
-       u64 fat_time;
+       time64_t time;
+       u64 hw_counter;
        u8 buf[6];
        u8 rtcval;
        int err;
@@ -134,11 +133,11 @@ static int ab3100_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alarm)
                                                     AB3100_AL0, buf, 4);
        if (err)
                return err;
-       fat_time = ((u64) buf[3] << 40) | ((u64) buf[2] << 32) |
+       hw_counter = ((u64) buf[3] << 40) | ((u64) buf[2] << 32) |
                ((u64) buf[1] << 24) | ((u64) buf[0] << 16);
-       time = (unsigned long) (fat_time / (u64) (AB3100_RTC_CLOCK_RATE * 2));
+       time = hw_counter / (u64) (AB3100_RTC_CLOCK_RATE * 2);
 
-       rtc_time_to_tm(time, &alarm->time);
+       rtc_time64_to_tm(time, &alarm->time);
 
        return rtc_valid_tm(&alarm->time);
 }
@@ -147,17 +146,17 @@ static int ab3100_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alarm)
 {
        u8 regs[] = {AB3100_AL0, AB3100_AL1, AB3100_AL2, AB3100_AL3};
        unsigned char buf[4];
-       unsigned long secs;
-       u64 fat_time;
+       time64_t secs;
+       u64 hw_counter;
        int err;
        int i;
 
-       rtc_tm_to_time(&alarm->time, &secs);
-       fat_time = (u64) secs * AB3100_RTC_CLOCK_RATE * 2;
-       buf[0] = (fat_time >> 16) & 0xFF;
-       buf[1] = (fat_time >> 24) & 0xFF;
-       buf[2] = (fat_time >> 32) & 0xFF;
-       buf[3] = (fat_time >> 40) & 0xFF;
+       secs = rtc_tm_to_time64(&alarm->time);
+       hw_counter = secs * AB3100_RTC_CLOCK_RATE * 2;
+       buf[0] = (hw_counter >> 16) & 0xFF;
+       buf[1] = (hw_counter >> 24) & 0xFF;
+       buf[2] = (hw_counter >> 32) & 0xFF;
+       buf[3] = (hw_counter >> 40) & 0xFF;
 
        /* Set the alarm */
        for (i = 0; i < 4; i++) {
@@ -193,7 +192,7 @@ static int ab3100_rtc_irq_enable(struct device *dev, unsigned int enabled)
 
 static const struct rtc_class_ops ab3100_rtc_ops = {
        .read_time      = ab3100_rtc_read_time,
-       .set_mmss       = ab3100_rtc_set_mmss,
+       .set_mmss64     = ab3100_rtc_set_mmss,
        .read_alarm     = ab3100_rtc_read_alarm,
        .set_alarm      = ab3100_rtc_set_alarm,
        .alarm_irq_enable = ab3100_rtc_irq_enable,