[PATCH] RTC: more XSTP/VDET support for rtc-rs5c348 driver

If the chip detected "oscillator stop" condition, show an warning message.
And initialize it with the Epoch time instead of leaving it with unknown
date/time.

Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Acked-by: Alessandro Zummo <a.zummo@towertech.it>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

diff --git a/drivers/rtc/rtc-rs5c348.c b/drivers/rtc/rtc-rs5c348.c
index 0964d1dba92519e6fe3ab799f2c04bb4ae26db40..25589061f9310d6555d729205b09490982c19132 100644 (file)
--- a/drivers/rtc/rtc-rs5c348.c
+++ b/drivers/rtc/rtc-rs5c348.c
@@ -23,7 +23,7 @@
 #include <linux/workqueue.h>
 #include <linux/spi/spi.h>
 
-#define DRV_VERSION "0.1"
+#define DRV_VERSION "0.2"
 
 #define RS5C348_REG_SECS       0
 #define RS5C348_REG_MINS       1
@@ -175,8 +175,15 @@ static int __devinit rs5c348_probe(struct spi_device *spi)
                goto kfree_exit;
        if (ret & (RS5C348_BIT_XSTP | RS5C348_BIT_VDET)) {
                u8 buf[2];
+               struct rtc_time tm;
                if (ret & RS5C348_BIT_VDET)
                        dev_warn(&spi->dev, "voltage-low detected.\n");
+               if (ret & RS5C348_BIT_XSTP)
+                       dev_warn(&spi->dev, "oscillator-stop detected.\n");
+               rtc_time_to_tm(0, &tm); /* 1970/1/1 */
+               ret = rs5c348_rtc_set_time(&spi->dev, &tm);
+               if (ret < 0)
+                       goto kfree_exit;
                buf[0] = RS5C348_CMD_W(RS5C348_REG_CTL2);
                buf[1] = 0;
                ret = spi_write_then_read(spi, buf, sizeof(buf), NULL, 0);