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rtc: define RTC_VL_READ values

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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>
This commit is contained in:
Alexandre Belloni 2019-12-14 23:02:43 +01:00
parent 3b52093dc9
commit 3431ca4837
1 changed files with 6 additions and 1 deletions
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7
include/uapi/linux/rtc.h
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@ -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 */