[PATCH 3/3] rtc: pcf8523: report oscillator failures

[Alexandre Belloni]

Report oscillator failures and invalid date/time on RTC_VL_READ.

Signed-off-by: Alexandre Belloni <alexandre.bell...@bootlin.com>
---
 drivers/rtc/rtc-pcf8523.c | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/drivers/rtc/rtc-pcf8523.c b/drivers/rtc/rtc-pcf8523.c
index feadab8e3bd3..bb23379bbfc7 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;
-- 
2.30.2