diff options
Diffstat (limited to 'drivers/rtc/rtc-pcf85063.c')
| -rw-r--r-- | drivers/rtc/rtc-pcf85063.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/rtc/rtc-pcf85063.c b/drivers/rtc/rtc-pcf85063.c index 7f9caee5f4ab..e0343e6aeb31 100644 --- a/drivers/rtc/rtc-pcf85063.c +++ b/drivers/rtc/rtc-pcf85063.c @@ -22,6 +22,7 @@ #define PCF85063_REG_CTRL2 0x01 #define PCF85063_REG_SC 0x04 /* datetime */ +#define PCF85063_REG_SC_OS 0x80 #define PCF85063_REG_MN 0x05 #define PCF85063_REG_HR 0x06 #define PCF85063_REG_DM 0x07 @@ -62,6 +63,12 @@ static int pcf85063_get_datetime(struct i2c_client *client, struct rtc_time *tm) return -EIO; } + /* if the clock has lost its power it makes no sense to use its time */ + if (regs[0] & PCF85063_REG_SC_OS) { + dev_warn(&client->dev, "Power loss detected, invalid time\n"); + return -EINVAL; + } + tm->tm_sec = bcd2bin(regs[0] & 0x7F); tm->tm_min = bcd2bin(regs[1] & 0x7F); tm->tm_hour = bcd2bin(regs[2] & 0x3F); /* rtc hr 0-23 */ |