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| author | Alexandre Belloni <alexandre.belloni@bootlin.com> | 2019-12-15 01:02:43 +0300 |
|---|---|---|
| committer | Alexandre Belloni <alexandre.belloni@bootlin.com> | 2019-12-18 12:37:18 +0300 |
| commit | 3431ca4837bf7f2b816e4c439db5bb66e7586746 (patch) | |
| tree | f5154638098278b5a4c51a6fa09ed729075ffc04 | |
| parent | 3b52093dc9175f48b275a02919149a2dff3a386d (diff) | |
| download | linux-3431ca4837bf7f2b816e4c439db5bb66e7586746.tar.xz | |
rtc: define RTC_VL_READ values
Currently, the meaning of the value returned by RTC_VL_READ is undocumented
and left to the driver implementation. In order to get more meaningful
values, define a set of values to use as to make clear to userspace what is
the status of the various voltages feeding the RTC.
Link: https://lore.kernel.org/r/20191214220259.621996-2-alexandre.belloni@bootlin.com
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
| -rw-r--r-- | include/uapi/linux/rtc.h | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/include/uapi/linux/rtc.h b/include/uapi/linux/rtc.h index 2ad1788968d0..095af360326a 100644 --- a/include/uapi/linux/rtc.h +++ b/include/uapi/linux/rtc.h @@ -92,7 +92,12 @@ struct rtc_pll_info { #define RTC_PLL_GET _IOR('p', 0x11, struct rtc_pll_info) /* Get PLL correction */ #define RTC_PLL_SET _IOW('p', 0x12, struct rtc_pll_info) /* Set PLL correction */ -#define RTC_VL_READ _IOR('p', 0x13, int) /* Voltage low detector */ +#define RTC_VL_DATA_INVALID BIT(0) /* Voltage too low, RTC data is invalid */ +#define RTC_VL_BACKUP_LOW BIT(1) /* Backup voltage is low */ +#define RTC_VL_BACKUP_EMPTY BIT(2) /* Backup empty or not present */ +#define RTC_VL_ACCURACY_LOW BIT(3) /* Voltage is low, RTC accuracy is reduced */ + +#define RTC_VL_READ _IOR('p', 0x13, unsigned int) /* Voltage low detection */ #define RTC_VL_CLR _IO('p', 0x14) /* Clear voltage low information */ /* interrupt flags */ |