1 files changed, 30 insertions, 4 deletions

diff --git a/drivers/rtc/rtc-m48t59.c b/drivers/rtc/rtc-m48t59.c
index 04b63dab6932..43afb7ab5289 100644
--- a/drivers/rtc/rtc-m48t59.c
+++ b/drivers/rtc/rtc-m48t59.c
@@ -87,6 +87,10 @@ static int m48t59_rtc_read_time(struct device *dev, struct rtc_time *tm)
                 dev_dbg(dev, "Century bit is enabled\n");
                 tm->tm_year += 100;     /* one century */
         }
+#ifdef CONFIG_SPARC
+        /* Sun SPARC machines count years since 1968 */
+        tm->tm_year += 68;
+#endif
 
         tm->tm_wday     = bcd2bin(val & 0x07);
         tm->tm_hour     = bcd2bin(M48T59_READ(M48T59_HOUR) & 0x3F);
@@ -110,11 +114,20 @@ static int m48t59_rtc_set_time(struct device *dev, struct rtc_time *tm)
         struct m48t59_private *m48t59 = platform_get_drvdata(pdev);
         unsigned long flags;
         u8 val = 0;
+        int year = tm->tm_year;
+
+#ifdef CONFIG_SPARC
+        /* Sun SPARC machines count years since 1968 */
+        year -= 68;
+#endif
 
         dev_dbg(dev, "RTC set time %04d-%02d-%02d %02d/%02d/%02d\n",
-                tm->tm_year + 1900, tm->tm_mon, tm->tm_mday,
+                year + 1900, tm->tm_mon, tm->tm_mday,
                 tm->tm_hour, tm->tm_min, tm->tm_sec);
 
+        if (year < 0)
+                return -EINVAL;
+
         spin_lock_irqsave(&m48t59->lock, flags);
         /* Issue the WRITE command */
         M48T59_SET_BITS(M48T59_CNTL_WRITE, M48T59_CNTL);
@@ -125,9 +138,9 @@ static int m48t59_rtc_set_time(struct device *dev, struct rtc_time *tm)
         M48T59_WRITE((bin2bcd(tm->tm_mday) & 0x3F), M48T59_MDAY);
         /* tm_mon is 0-11 */
         M48T59_WRITE((bin2bcd(tm->tm_mon + 1) & 0x1F), M48T59_MONTH);
-        M48T59_WRITE(bin2bcd(tm->tm_year % 100), M48T59_YEAR);
+        M48T59_WRITE(bin2bcd(year % 100), M48T59_YEAR);
 
-        if (pdata->type == M48T59RTC_TYPE_M48T59 && (tm->tm_year / 100))
+        if (pdata->type == M48T59RTC_TYPE_M48T59 && (year / 100))
                 val = (M48T59_WDAY_CEB | M48T59_WDAY_CB);
         val |= (bin2bcd(tm->tm_wday) & 0x07);
         M48T59_WRITE(val, M48T59_WDAY);
@@ -159,6 +172,10 @@ static int m48t59_rtc_readalarm(struct device *dev, struct rtc_wkalrm *alrm)
         M48T59_SET_BITS(M48T59_CNTL_READ, M48T59_CNTL);
 
         tm->tm_year = bcd2bin(M48T59_READ(M48T59_YEAR));
+#ifdef CONFIG_SPARC
+        /* Sun SPARC machines count years since 1968 */
+        tm->tm_year += 68;
+#endif
         /* tm_mon is 0-11 */
         tm->tm_mon = bcd2bin(M48T59_READ(M48T59_MONTH)) - 1;
 
@@ -192,11 +209,20 @@ static int m48t59_rtc_setalarm(struct device *dev, struct rtc_wkalrm *alrm)
         struct rtc_time *tm = &alrm->time;
         u8 mday, hour, min, sec;
         unsigned long flags;
+        int year = tm->tm_year;
+
+#ifdef CONFIG_SPARC
+        /* Sun SPARC machines count years since 1968 */
+        year -= 68;
+#endif
 
         /* If no irq, we don't support ALARM */
         if (m48t59->irq == NO_IRQ)
                 return -EIO;
 
+        if (year < 0)
+                return -EINVAL;
+
         /*
          * 0xff means "always match"
          */
@@ -228,7 +254,7 @@ static int m48t59_rtc_setalarm(struct device *dev, struct rtc_wkalrm *alrm)
         spin_unlock_irqrestore(&m48t59->lock, flags);
 
         dev_dbg(dev, "RTC set alarm time %04d-%02d-%02d %02d/%02d/%02d\n",
-                tm->tm_year + 1900, tm->tm_mon, tm->tm_mday,
+                year + 1900, tm->tm_mon, tm->tm_mday,
                 tm->tm_hour, tm->tm_min, tm->tm_sec);
         return 0;
 }