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authorMatthew Garrett <mjg@redhat.com>2009-09-22 16:46:31 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2009-09-23 07:39:46 -0700
commitea3d1606fd32059461309099e8856c6652888a79 (patch)
tree5d70c39a7534801759a09c5e377afa8f04e7dcca /Documentation/rtc.txt
parentdac94d9ec98517e8fe3f980e38f29ea3ac712168 (diff)
downloadlinux-linaro-stable-ea3d1606fd32059461309099e8856c6652888a79.tar.gz
rtc: document the sysfs interface
The sysfs interface to the RTC class drivers is currently undocumented. Add some basic documentation defining the semantics of the fields. Signed-off-by: Matthew Garrett <mjg@redhat.com> Cc: Mark Brown <broonie@opensource.wolfsonmicro.com> Acked-by: Alessandro Zummo <a.zummo@towertech.it> Cc: David Brownell <david-b@pacbell.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'Documentation/rtc.txt')
-rw-r--r--Documentation/rtc.txt22
1 files changed, 22 insertions, 0 deletions
diff --git a/Documentation/rtc.txt b/Documentation/rtc.txt
index 102ce9625e65..2745e8197fde 100644
--- a/Documentation/rtc.txt
+++ b/Documentation/rtc.txt
@@ -135,6 +135,28 @@ a high functionality RTC is integrated into the SOC. That system might read
the system clock from the discrete RTC, but use the integrated one for all
other tasks, because of its greater functionality.
+SYSFS INTERFACE
+---------------
+
+The sysfs interface under /sys/class/rtc/rtcN provides access to various
+rtc attributes without requiring the use of ioctls. All dates and times
+are in the RTC's timezone, rather than in system time.
+
+date: RTC-provided date
+max_user_freq: The maximum interrupt rate an unprivileged user may request
+ from this RTC.
+name: The name of the RTC corresponding to this sysfs directory
+since_epoch: The number of seconds since the epoch according to the RTC
+time: RTC-provided time
+wakealarm: The time at which the clock will generate a system wakeup
+ event. This is a one shot wakeup event, so must be reset
+ after wake if a daily wakeup is required. Format is either
+ seconds since the epoch or, if there's a leading +, seconds
+ in the future.
+
+IOCTL INTERFACE
+---------------
+
The ioctl() calls supported by /dev/rtc are also supported by the RTC class
framework. However, because the chips and systems are not standardized,
some PC/AT functionality might not be provided. And in the same way, some