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-rw-r--r--drivers/rtc/rtc-ds1307.c25
1 files changed, 25 insertions, 0 deletions
diff --git a/drivers/rtc/rtc-ds1307.c b/drivers/rtc/rtc-ds1307.c
index 81e20653700d..974eafda9de4 100644
--- a/drivers/rtc/rtc-ds1307.c
+++ b/drivers/rtc/rtc-ds1307.c
@@ -194,6 +194,20 @@ static int ds1307_get_time(struct device *dev, struct rtc_time *t)
const struct chip_desc *chip = &chips[ds1307->type];
u8 regs[7];
+ if (ds1307->type == rx_8130) {
+ unsigned int regflag;
+ ret = regmap_read(ds1307->regmap, RX8130_REG_FLAG, &regflag);
+ if (ret) {
+ dev_err(dev, "%s error %d\n", "read", ret);
+ return ret;
+ }
+
+ if (regflag & RX8130_REG_FLAG_VLF) {
+ dev_warn_once(dev, "oscillator failed, set time!\n");
+ return -EINVAL;
+ }
+ }
+
/* read the RTC date and time registers all at once */
ret = regmap_bulk_read(ds1307->regmap, chip->offset, regs,
sizeof(regs));
@@ -293,6 +307,17 @@ static int ds1307_set_time(struct device *dev, struct rtc_time *t)
dev_err(dev, "%s error %d\n", "write", result);
return result;
}
+
+ if (ds1307->type == rx_8130) {
+ /* clear Voltage Loss Flag as data is available now */
+ result = regmap_write(ds1307->regmap, RX8130_REG_FLAG,
+ ~(u8)RX8130_REG_FLAG_VLF);
+ if (result) {
+ dev_err(dev, "%s error %d\n", "write", result);
+ return result;
+ }
+ }
+
return 0;
}