rtc: rx8025: only handle dates between 2000 and 2099

The hardware is only capable of handling dates between 2000 and 2099,
enforce that.

Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>

diff --git a/drivers/rtc/rtc-rx8025.c b/drivers/rtc/rtc-rx8025.c
index 52683eda1da28768e8dd8167537f96815e085fe0..3612362b65ac45092203a96305829ee82359054b 100644 (file)
--- a/drivers/rtc/rtc-rx8025.c
+++ b/drivers/rtc/rtc-rx8025.c
@@ -188,10 +188,7 @@ static int rx8025_get_time(struct device *dev, struct rtc_time *dt)
 
        dt->tm_mday = bcd2bin(date[RX8025_REG_MDAY] & 0x3f);
        dt->tm_mon = bcd2bin(date[RX8025_REG_MONTH] & 0x1f) - 1;
-       dt->tm_year = bcd2bin(date[RX8025_REG_YEAR]);
-
-       if (dt->tm_year < 70)
-               dt->tm_year += 100;
+       dt->tm_year = bcd2bin(date[RX8025_REG_YEAR]) + 100;
 
        dev_dbg(dev, "%s: date %ds %dm %dh %dmd %dm %dy\n", __func__,
                dt->tm_sec, dt->tm_min, dt->tm_hour,
@@ -205,11 +202,8 @@ static int rx8025_set_time(struct device *dev, struct rtc_time *dt)
        struct rx8025_data *rx8025 = dev_get_drvdata(dev);
        u8 date[7];
 
-       /*
-        * BUG: The HW assumes every year that is a multiple of 4 to be a leap
-        * year.  Next time this is wrong is 2100, which will not be a leap
-        * year.
-        */
+       if ((dt->tm_year < 100) || (dt->tm_year > 199))
+               return -EINVAL;
 
        /*
         * Here the read-only bits are written as "0".  I'm not sure if that
@@ -226,7 +220,7 @@ static int rx8025_set_time(struct device *dev, struct rtc_time *dt)
        date[RX8025_REG_WDAY] = bin2bcd(dt->tm_wday);
        date[RX8025_REG_MDAY] = bin2bcd(dt->tm_mday);
        date[RX8025_REG_MONTH] = bin2bcd(dt->tm_mon + 1);
-       date[RX8025_REG_YEAR] = bin2bcd(dt->tm_year % 100);
+       date[RX8025_REG_YEAR] = bin2bcd(dt->tm_year - 100);
 
        dev_dbg(dev,
                "%s: write 0x%02x 0x%02x 0x%02x 0x%02x 0x%02x 0x%02x 0x%02x\n",