[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>

1 files changed, 8 insertions, 1 deletions

diff --git a/drivers/rtc/rtc-rs5c348.c b/drivers/rtc/rtc-rs5c348.c
index 0964d1dba925..25589061f931 100644
--- 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);