From e311c9295912209dcf8e54de5401f8518112b7f8 Mon Sep 17 00:00:00 2001 From: Alexander Stein Date: Tue, 29 May 2012 15:07:36 -0700 Subject: [PATCH] rtc: add ioctl to get/clear battery low voltage status Currently there is no generic way to get the RTC battery status within an application. So add an ioctl to read the status bit. The idea is that the bit is set once a low voltage is detected. It stays there until it is reset using the RTC_VL_CLR ioctl. Signed-off-by: Alexander Stein Cc: Alessandro Zummo Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- include/linux/rtc.h | 3 +++ 1 file changed, 3 insertions(+) diff --git a/include/linux/rtc.h b/include/linux/rtc.h index fcabfb4873c8..f071b3922c67 100644 --- a/include/linux/rtc.h +++ b/include/linux/rtc.h @@ -91,6 +91,9 @@ 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_CLR _IO('p', 0x14) /* Clear voltage low information */ + /* interrupt flags */ #define RTC_IRQF 0x80 /* Any of the following is active */ #define RTC_PF 0x40 /* Periodic interrupt */ -- GitLab