Messages in this thread | | | Date | Mon, 27 Oct 2014 16:31:24 +0100 | Subject | Re: A desktop environment[1] kernel wishlist | From | Geert Uytterhoeven <> |
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Hi Bastien,
On Mon, Oct 27, 2014 at 3:20 PM, Bastien Nocera <hadess@hadess.net> wrote: > On Tue, 2014-10-21 at 20:24 +0200, Geert Uytterhoeven wrote: >> On Tue, Oct 21, 2014 at 7:14 PM, Bastien Nocera <hadess@hadess.net> wrote: >> >> As for: 'Export of "wake reason" when the system wakes up (rtc alarm, >> >> lid open, etc.) and wakealarm (/sys/class/rtc/foo/wakealarm) >> >> documentation' >> >> >> >> Can you expand more on the rational for the need here? Is this for UI >> >> for power debugging, or something else? >> > >> > No, it would be used for automating backups, or implementing >> > suspend->hibernation transitions. For example, right before the machine >> > suspends, I would schedule it to wake up in a hour. If I get woken up by >> > the rtc alarm (and not by the user through a lid open), I might: >> > - check that I'm plugged into the AC, it's night, and in the vicinity of >> > the server that handles my backups and so backup the system. >> > - check whether the battery is low, and hibernate the machine (if it >> > supports it, obviously). >> >> Isn't this already available through /sys/kernel/debug/wakeup_sources >> and/or the various power/wake* files in sysfs? > > That might very well be, but /sys/kernel/debug/wakeup_sources really > isn't much of a user-space API. Where's the documentation for the > various power/wake* files?
The debugfs entry is indeed not documented. Documentation for the others is just a git grep away:
$ git grep power/wake -- Documentation/ Documentation/ABI/testing/sysfs-devices-power:What: /sys/devices/.../power/wakeup Documentation/ABI/testing/sysfs-devices-power: The /sys/devices/.../power/wakeup attribute allows the user Documentation/ABI/testing/sysfs-devices-power: have one of the following two values for the sysfs power/wakeup Documentation/ABI/testing/sysfs-devices-power:What: /sys/devices/.../power/wakeup_count Documentation/ABI/testing/sysfs-devices-power:What: /sys/devices/.../power/wakeup_active_count Documentation/ABI/testing/sysfs-devices-power:What: /sys/devices/.../power/wakeup_abort_count Documentation/ABI/testing/sysfs-devices-power:What: /sys/devices/.../power/wakeup_expire_count Documentation/ABI/testing/sysfs-devices-power:What: /sys/devices/.../power/wakeup_active Documentation/ABI/testing/sysfs-devices-power:What: /sys/devices/.../power/wakeup_total_time_ms Documentation/ABI/testing/sysfs-devices-power:What: /sys/devices/.../power/wakeup_max_time_ms Documentation/ABI/testing/sysfs-devices-power:What: /sys/devices/.../power/wakeup_last_time_ms Documentation/ABI/testing/sysfs-devices-power:What: /sys/devices/.../power/wakeup_prevent_sleep_time_ms Documentation/ABI/testing/sysfs-power:What: /sys/power/wakeup_count Documentation/ABI/testing/sysfs-power: The /sys/power/wakeup_count file allows user space to put the Documentation/ABI/testing/sysfs-power:What: /sys/power/wake_lock Documentation/ABI/testing/sysfs-power: The /sys/power/wake_lock file allows user space to create Documentation/ABI/testing/sysfs-power: /sys/power/wakeup_count file block or return false). When a Documentation/ABI/testing/sysfs-power: string without white space is written to /sys/power/wake_lock, Documentation/ABI/testing/sysfs-power: If a string written to /sys/power/wake_lock contains white Documentation/ABI/testing/sysfs-power:What: /sys/power/wake_unlock Documentation/ABI/testing/sysfs-power: The /sys/power/wake_unlock file allows user space to deactivate Documentation/ABI/testing/sysfs-power: wakeup sources created with the help of /sys/power/wake_lock. Documentation/ABI/testing/sysfs-power: When a string is written to /sys/power/wake_unlock, it will be Documentation/ABI/testing/sysfs-power: wakeup sources created with the help of /sys/power/wake_lock Documentation/power/devices.txt: using the relevant /sys/devices/.../power/wakeup file (for Ethernet Documentation/power/devices.txt:/sys/devices/.../power/wakeup files Documentation/power/devices.txt:"power/wakeup" file. User space can write the strings "enabled" or "disabled" Documentation/power/devices.txt:The "power/wakeup" file is supposed to contain the "disabled" string initially Documentation/power/devices.txt:exists and the corresponding "power/wakeup" file contains the string "enabled". Documentation/usb/power-management.txt: power/wakeup
Gr{oetje,eeting}s,
Geert
-- Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org
In personal conversations with technical people, I call myself a hacker. But when I'm talking to journalists I just say "programmer" or something like that. -- Linus Torvalds
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