rtc: add ioctl to get/clear battery low voltage status
authorAlexander Stein <alexander.stein@systec-electronic.com>
Tue, 29 May 2012 22:07:36 +0000 (15:07 -0700)
committerLinus Torvalds <torvalds@linux-foundation.org>
Tue, 29 May 2012 23:22:33 +0000 (16:22 -0700)
commite311c9295912209dcf8e54de5401f8518112b7f8
treee1016bbb7d43aa6086ea0ee5d1935b309d43d81c
parent84d56b38b9abd36565f74cbf68501cee6206761e
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 <alexander.stein@systec-electronic.com>
Cc: Alessandro Zummo <a.zummo@towertech.it>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
include/linux/rtc.h