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| author | Bernie Thompson <bhthompson@chromium.org> | 2013-07-03 15:07:03 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2013-07-03 16:07:54 -0700 |
| commit | 1df0a4711f6e93c1073dd82f6e7905748842e2b3 (patch) | |
| tree | 4a885c99a414d23d5be468b75aa8ea68109d1081 /Documentation/rtc.txt | |
| parent | c67d96e317510e63e8a24d3a5742dd47b21c3340 (diff) | |
| download | lwn-1df0a4711f6e93c1073dd82f6e7905748842e2b3.tar.gz lwn-1df0a4711f6e93c1073dd82f6e7905748842e2b3.zip | |
rtc: add ability to push out an existing wakealarm using sysfs
This adds the ability for the rtc sysfs code to handle += characters at
the beginning of a wakealarm setting string. This will allow the user
to attempt to push out an existing wakealarm by a provided amount.
In the case that the += characters are provided but the alarm is not
active -EINVAL is returned.
his is useful, at least for my purposes in suspend/resume testing. The
basic test goes something like:
1. Set a wake alarm from userspace 5 seconds in the future
2. Start the suspend process (echo mem > /sys/power/state)
3. After ~2.5 seconds if userspace is still running (using another
thread to check this), move the wake alarm 5 more seconds
If the "move" involves an unset of the wakealarm then there's a period
of time where the system is midway through suspending but has no wake
alarm. It will get stuck.
We'd rather not remove the "move" since the idea is to avoid a cancelled
suspend when the alarm fires _during_ suspend. It is difficult for the
test to tell the difference between a suspend that was cancelled because
the alarm fired too early and a suspend that was
Signed-off-by: Bernie Thompson <bhthompson@chromium.org>
Cc: Alessandro Zummo <a.zummo@towertech.it>
Cc: Doug Anderson <dianders@chromium.org>
Cc: "Rafael J. Wysocki" <rjw@sisk.pl>
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.txt | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/Documentation/rtc.txt b/Documentation/rtc.txt index 32aa4002de4a..596b60c08b74 100644 --- a/Documentation/rtc.txt +++ b/Documentation/rtc.txt @@ -153,9 +153,10 @@ 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. + after wake if a daily wakeup is required. Format is seconds since + the epoch by default, or if there's a leading +, seconds in the + future, or if there is a leading +=, seconds ahead of the current + alarm. IOCTL INTERFACE --------------- |