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rtc: pcf8523: report oscillator failures

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Report oscillator failures and invalid date/time on RTC_VL_READ.

Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Link: https://lore.kernel.org/r/20210418002023.1000265-3-alexandre.belloni@bootlin.com
This commit is contained in:
Alexandre Belloni 2021-04-18 02:20:23 +02:00
parent 13e37b7fb7
commit a1cfe7cc38
1 changed files with 11 additions and 2 deletions
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13
drivers/rtc/rtc-pcf8523.c
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@ -406,6 +406,8 @@ static int pcf8523_rtc_ioctl(struct device *dev, unsigned int cmd,
unsigned long arg)
{
struct i2c_client *client = to_i2c_client(dev);
unsigned int flags = 0;
u8 value;
int ret;
switch (cmd) {
@ -414,9 +416,16 @@ static int pcf8523_rtc_ioctl(struct device *dev, unsigned int cmd,
if (ret < 0)
return ret;
if (ret)
ret = RTC_VL_BACKUP_LOW;
flags |= RTC_VL_BACKUP_LOW;
return put_user(ret, (unsigned int __user *)arg);
ret = pcf8523_read(client, REG_SECONDS, &value);
if (ret < 0)
return ret;
if (value & REG_SECONDS_OS)
flags |= RTC_VL_DATA_INVALID;
return put_user(flags, (unsigned int __user *)arg);
default:
return -ENOIOCTLCMD;