lkml.org 
[lkml]   [2012]   [Feb]   [14]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 1/2 RFC] rtc: Add ioctl to get/clear battery low voltage status
Date
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 <alexander.stein@systec-electronic.com>
---
include/linux/rtc.h | 3 +++
1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/include/linux/rtc.h b/include/linux/rtc.h
index 93f4d03..1a6ec5f 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 */
--
1.7.3.4


\
 
 \ /
  Last update: 2012-02-14 17:17    [W:0.250 / U:0.240 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site