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authorAlexandre Belloni <alexandre.belloni@bootlin.com>2021-04-18 02:20:23 +0200
committerAlexandre Belloni <alexandre.belloni@bootlin.com>2021-04-29 23:37:18 +0200
commita1cfe7cc3873baf83a26356cb5e10409c6fb942c (patch)
tree1cf6b54849f8623ac598e87675607093186816cd /drivers/rtc
parent13e37b7fb75dfaeb4f5a72468f0bd32853628d28 (diff)
rtc: pcf8523: report oscillator failures
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
Diffstat (limited to 'drivers/rtc')
-rw-r--r--drivers/rtc/rtc-pcf8523.c13
1 files changed, 11 insertions, 2 deletions
diff --git a/drivers/rtc/rtc-pcf8523.c b/drivers/rtc/rtc-pcf8523.c
index 4e5e5caeb8ce..740e2136ca98 100644
--- a/drivers/rtc/rtc-pcf8523.c
+++ b/drivers/rtc/rtc-pcf8523.c
@@ -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;
+
+ 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(ret, (unsigned int __user *)arg);
+ return put_user(flags, (unsigned int __user *)arg);
default:
return -ENOIOCTLCMD;