From: Jan Östlund <j...@hms.se> While the oscillator failure flag is set, the RTC registers should be considered invalid. bq32k_rtc_read_time() now returns an error instead of an invalid time.
The failure flag is cleared the next time the clock is set. Signed-off-by: Daniel Romell <d...@hms.se> --- drivers/rtc/rtc-bq32k.c | 14 +++++++++----- 1 file changed, 9 insertions(+), 5 deletions(-) diff --git a/drivers/rtc/rtc-bq32k.c b/drivers/rtc/rtc-bq32k.c index 5a0c137..3fc6f7c 100644 --- a/drivers/rtc/rtc-bq32k.c +++ b/drivers/rtc/rtc-bq32k.c @@ -93,6 +93,13 @@ static int bq32k_rtc_read_time(struct device *dev, struct rtc_time *tm) if (error) return error; + /* + * In case of oscillator failure, the register contents should be + * considered invalid. The flag is cleared the next time the RTC is set. + */ + if (regs.minutes & BQ32K_OF) + return -EIO; + tm->tm_sec = bcd2bin(regs.seconds & BQ32K_SECONDS_MASK); tm->tm_min = bcd2bin(regs.minutes & BQ32K_MINUTES_MASK); tm->tm_hour = bcd2bin(regs.cent_hours & BQ32K_HOURS_MASK); @@ -204,13 +211,10 @@ static int bq32k_probe(struct i2c_client *client, /* Check Oscillator Failure flag */ error = bq32k_read(dev, ®, BQ32K_MINUTES, 1); - if (!error && (reg & BQ32K_OF)) { - dev_warn(dev, "Oscillator Failure. Check RTC battery.\n"); - reg &= ~BQ32K_OF; - error = bq32k_write(dev, ®, BQ32K_MINUTES, 1); - } if (error) return error; + if (reg & BQ32K_OF) + dev_warn(dev, "Oscillator Failure. Check RTC battery.\n"); if (client->dev.of_node) trickle_charger_of_init(dev, client->dev.of_node); -- 2.7.4 -- You received this message because you are subscribed to "rtc-linux". Membership options at http://groups.google.com/group/rtc-linux . Please read http://groups.google.com/group/rtc-linux/web/checklist before submitting a driver. --- You received this message because you are subscribed to the Google Groups "rtc-linux" group. To unsubscribe from this group and stop receiving emails from it, send an email to rtc-linux+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.