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path: root/drivers/rtc/rtc-ds1302.c
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Diffstat (limited to 'drivers/rtc/rtc-ds1302.c')
-rw-r--r--drivers/rtc/rtc-ds1302.c15
1 files changed, 7 insertions, 8 deletions
diff --git a/drivers/rtc/rtc-ds1302.c b/drivers/rtc/rtc-ds1302.c
index d13954346286..07e8d79b4a09 100644
--- a/drivers/rtc/rtc-ds1302.c
+++ b/drivers/rtc/rtc-ds1302.c
@@ -23,8 +23,12 @@
#define RTC_CMD_READ 0x81 /* Read command */
#define RTC_CMD_WRITE 0x80 /* Write command */
+#define RTC_CMD_WRITE_ENABLE 0x00 /* Write enable */
+#define RTC_CMD_WRITE_DISABLE 0x80 /* Write disable */
+
#define RTC_ADDR_RAM0 0x20 /* Address of RAM0 */
#define RTC_ADDR_TCR 0x08 /* Address of trickle charge register */
+#define RTC_ADDR_CTRL 0x07 /* Address of control register */
#define RTC_ADDR_YEAR 0x06 /* Address of year register */
#define RTC_ADDR_DAY 0x05 /* Address of day of week register */
#define RTC_ADDR_MON 0x04 /* Address of month register */
@@ -161,6 +165,7 @@ static int ds1302_rtc_read_time(struct device *dev, struct rtc_time *tm)
static int ds1302_rtc_set_time(struct device *dev, struct rtc_time *tm)
{
+ ds1302_writebyte(RTC_ADDR_CTRL, RTC_CMD_WRITE_ENABLE);
/* Stop RTC */
ds1302_writebyte(RTC_ADDR_SEC, ds1302_readbyte(RTC_ADDR_SEC) | 0x80);
@@ -175,6 +180,8 @@ static int ds1302_rtc_set_time(struct device *dev, struct rtc_time *tm)
/* Start RTC */
ds1302_writebyte(RTC_ADDR_SEC, ds1302_readbyte(RTC_ADDR_SEC) & ~0x80);
+ ds1302_writebyte(RTC_ADDR_CTRL, RTC_CMD_WRITE_DISABLE);
+
return 0;
}
@@ -234,19 +241,11 @@ static int __init ds1302_rtc_probe(struct platform_device *pdev)
return 0;
}
-static int __exit ds1302_rtc_remove(struct platform_device *pdev)
-{
- platform_set_drvdata(pdev, NULL);
-
- return 0;
-}
-
static struct platform_driver ds1302_platform_driver = {
.driver = {
.name = DRV_NAME,
.owner = THIS_MODULE,
},
- .remove = __exit_p(ds1302_rtc_remove),
};
module_platform_driver_probe(ds1302_platform_driver, ds1302_rtc_probe);