[PATCH] ARM: RTC: allow driver methods to return error

Allow RTC drivers to return error codes from their read_time
or read_alarm methods.

Signed-off-by: Russell King <rmk@arm.linux.org.uk>

4 files changed, 35 insertions, 23 deletions

diff --git a/arch/arm/common/rtctime.c b/arch/arm/common/rtctime.c
index c397e71f938d..72b03f201eb9 100644
--- a/arch/arm/common/rtctime.c
+++ b/arch/arm/common/rtctime.c
@@ -141,10 +141,10 @@ void rtc_next_alarm_time(struct rtc_time *next, struct rtc_time *now, struct rtc
         next->tm_sec = alrm->tm_sec;
 }
 
-static inline void rtc_read_time(struct rtc_ops *ops, struct rtc_time *tm)
+static inline int rtc_read_time(struct rtc_ops *ops, struct rtc_time *tm)
 {
         memset(tm, 0, sizeof(struct rtc_time));
-        ops->read_time(tm);
+        return ops->read_time(tm);
 }
 
 static inline int rtc_set_time(struct rtc_ops *ops, struct rtc_time *tm)
@@ -163,8 +163,7 @@ static inline int rtc_read_alarm(struct rtc_ops *ops, struct rtc_wkalrm *alrm)
         int ret = -EINVAL;
         if (ops->read_alarm) {
                 memset(alrm, 0, sizeof(struct rtc_wkalrm));
-                ops->read_alarm(alrm);
-                ret = 0;
+                ret = ops->read_alarm(alrm);
         }
         return ret;
 }
@@ -283,7 +282,9 @@ static int rtc_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
                 break;
 
         case RTC_RD_TIME:
-                rtc_read_time(ops, &tm);
+                ret = rtc_read_time(ops, &tm);
+                if (ret)
+                        break;
                 ret = copy_to_user(uarg, &tm, sizeof(tm));
                 if (ret)
                         ret = -EFAULT;
@@ -424,15 +425,15 @@ static int rtc_read_proc(char *page, char **start, off_t off, int count, int *eo
         struct rtc_time tm;
         char *p = page;
 
-        rtc_read_time(ops, &tm);
-
-        p += sprintf(p,
-                "rtc_time\t: %02d:%02d:%02d\n"
-                "rtc_date\t: %04d-%02d-%02d\n"
-                "rtc_epoch\t: %04lu\n",
-                tm.tm_hour, tm.tm_min, tm.tm_sec,
-                tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday,
-                rtc_epoch);
+        if (rtc_read_time(ops, &tm) == 0) {
+                p += sprintf(p,
+                        "rtc_time\t: %02d:%02d:%02d\n"
+                        "rtc_date\t: %04d-%02d-%02d\n"
+                        "rtc_epoch\t: %04lu\n",
+                        tm.tm_hour, tm.tm_min, tm.tm_sec,
+                        tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday,
+                        rtc_epoch);
+        }
 
         if (rtc_read_alarm(ops, &alrm) == 0) {
                 p += sprintf(p, "alrm_time\t: ");
diff --git a/arch/arm/mach-integrator/time.c b/arch/arm/mach-integrator/time.c
index 20729de2af28..1a844ca139e0 100644
--- a/arch/arm/mach-integrator/time.c
+++ b/arch/arm/mach-integrator/time.c
@@ -40,25 +40,32 @@ static int integrator_set_rtc(void)
         return 1;
 }
 
-static void rtc_read_alarm(struct rtc_wkalrm *alrm)
+static int rtc_read_alarm(struct rtc_wkalrm *alrm)
 {
         rtc_time_to_tm(readl(rtc_base + RTC_MR), &alrm->time);
+        return 0;
 }
 
-static int rtc_set_alarm(struct rtc_wkalrm *alrm)
+static inline int rtc_set_alarm(struct rtc_wkalrm *alrm)
 {
         unsigned long time;
         int ret;
 
-        ret = rtc_tm_to_time(&alrm->time, &time);
+        /*
+         * At the moment, we can only deal with non-wildcarded alarm times.
+         */
+        ret = rtc_valid_tm(&alrm->time);
+        if (ret == 0)
+                ret = rtc_tm_to_time(&alrm->time, &time);
         if (ret == 0)
                 writel(time, rtc_base + RTC_MR);
         return ret;
 }
 
-static void rtc_read_time(struct rtc_time *tm)
+static int rtc_read_time(struct rtc_time *tm)
 {
         rtc_time_to_tm(readl(rtc_base + RTC_DR), tm);
+        return 0;
 }
 
 /*
@@ -69,7 +76,7 @@ static void rtc_read_time(struct rtc_time *tm)
  * edge of the 1Hz clock, we must write the time one second
  * in advance.
  */
-static int rtc_set_time(struct rtc_time *tm)
+static inline int rtc_set_time(struct rtc_time *tm)
 {
         unsigned long time;
         int ret;
diff --git a/drivers/char/s3c2410-rtc.c b/drivers/char/s3c2410-rtc.c
index 8e61be34a1d3..ed867db550a9 100644
--- a/drivers/char/s3c2410-rtc.c
+++ b/drivers/char/s3c2410-rtc.c
@@ -116,7 +116,7 @@ static void s3c2410_rtc_setfreq(int freq)
 
 /* Time read/write */
 
-static void s3c2410_rtc_gettime(struct rtc_time *rtc_tm)
+static int s3c2410_rtc_gettime(struct rtc_time *rtc_tm)
 {
         unsigned int have_retried = 0;
 
@@ -151,6 +151,8 @@ static void s3c2410_rtc_gettime(struct rtc_time *rtc_tm)
 
         rtc_tm->tm_year += 100;
         rtc_tm->tm_mon -= 1;
+
+        return 0;
 }
 
 
@@ -171,7 +173,7 @@ static int s3c2410_rtc_settime(struct rtc_time *tm)
         return 0;
 }
 
-static void s3c2410_rtc_getalarm(struct rtc_wkalrm *alrm)
+static int s3c2410_rtc_getalarm(struct rtc_wkalrm *alrm)
 {
         struct rtc_time *alm_tm = &alrm->time;
         unsigned int alm_en;
@@ -231,6 +233,8 @@ static void s3c2410_rtc_getalarm(struct rtc_wkalrm *alrm)
         }
 
         /* todo - set alrm->enabled ? */
+
+        return 0;
 }
 
 static int s3c2410_rtc_setalarm(struct rtc_wkalrm *alrm)
diff --git a/include/asm-arm/rtc.h b/include/asm-arm/rtc.h
index aa7e16b2e225..370dfe77589d 100644
--- a/include/asm-arm/rtc.h
+++ b/include/asm-arm/rtc.h
@@ -18,9 +18,9 @@ struct rtc_ops {
         void            (*release)(void);
         int             (*ioctl)(unsigned int, unsigned long);
 
-        void            (*read_time)(struct rtc_time *);
+        int             (*read_time)(struct rtc_time *);
         int             (*set_time)(struct rtc_time *);
-        void            (*read_alarm)(struct rtc_wkalrm *);
+        int             (*read_alarm)(struct rtc_wkalrm *);
         int             (*set_alarm)(struct rtc_wkalrm *);
         int             (*proc)(char *buf);
 };