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rtc: rv3028: return meaningful value for RTC_VL_READ

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RV3028_STATUS_PORF means the voltage dropped too low and data has been
lost.

Link: https://lore.kernel.org/r/20191214220259.621996-14-alexandre.belloni@bootlin.com
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
This commit is contained in:
Alexandre Belloni 2019-12-14 23:02:55 +01:00
parent 92c02daaba
commit 86e655f9f3
1 changed files with 2 additions and 9 deletions
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11
drivers/rtc/rtc-rv3028.c
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@ -428,15 +428,8 @@ static int rv3028_ioctl(struct device *dev, unsigned int cmd, unsigned long arg)
if (ret < 0)
return ret;
if (status & RV3028_STATUS_PORF)
dev_warn(&rv3028->rtc->dev, "Voltage low, data loss detected.\n");
status &= RV3028_STATUS_PORF;
if (copy_to_user((void __user *)arg, &status, sizeof(int)))
return -EFAULT;
return 0;
status = status & RV3028_STATUS_PORF ? RTC_VL_DATA_INVALID : 0;
return put_user(status, (unsigned int __user *)arg);
default:
return -ENOIOCTLCMD;