Commit 3431ca48 authored by Alexandre Belloni's avatar Alexandre Belloni
Browse files

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: default avatarAlexandre Belloni <alexandre.belloni@bootlin.com>
parent 3b52093d

include/uapi/linux/rtc.h

+6 −1
Original line number Original line Diff line number Diff line
@@ -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_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_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 */

#define RTC_VL_CLR	_IO('p', 0x14)		/* Clear voltage low information */





/* interrupt flags */

/* interrupt flags */

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