Openmoko Bug #2008: Suspend exceptions: Do not suspend when certain apps are running

[Openmoko Public Trac]

#2008: Suspend exceptions: Do not suspend when certain apps are running
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    Reporter:  Benih              |        Owner:  openmoko-kernel
        Type:  enhancement        |       Status:  new            
    Priority:  normal             |    Milestone:                 
   Component:  System Software    |      Version:  Om2008.8       
    Severity:  minor              |   Resolution:                 
    Keywords:  suspend exception  |    Blockedby:                 
Reproducible:                     |     Blocking:                 
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Comment(by raster):

 this has been going on for a long while. everything you n4eed is already
 there. ompower is a userspace daemon you talk to via dbus to request power
 states of a device (right now only cpu supported and implicitly screen
 backlight is managed as a result). its a very small program too so can be
 extended very easily.

 to request suspend:

 dbus-send --system --dest=org.openmoko.Power / \
 org.openmoko.Power.Core.RequestResourceState \
 string:cpu string:my-system-name string:off

 to tell ompower that "i want to keep suspend from happening because i need
 the cpu":

 dbus-send --system --dest=org.openmoko.Power / \
 org.openmoko.Power.Core.RequestResourceState \
 string:cpu string:my-system-name string:on

 when you are done with your desire to keep the cpu up or you dont think it
 should be suspended anymore:

 dbus-send --system --dest=org.openmoko.Power / \
 org.openmoko.Power.Core.RemoveRequestedResourceState \
 string:cpu string:my-system-name

 so in the case of "i dont want to suspend while it is connected via usb"

 on usb connect:

 dbus-send --system --dest=org.openmoko.Power / \
 org.openmoko.Power.Core.RequestResourceState \
 string:cpu string:usb-connection string:on

 on usb disconnect:

 dbus-send --system --dest=org.openmoko.Power / \
 org.openmoko.Power.Core.RemoveRequestedResourceState \
 string:cpu string:usb-connection

 you can do this of course from anything that can talk dbus - not just the
 cmd-line. remember the "my-system-name" is an identifier for who is asking
 (i did it this way so it could be used from the cmd-line via dbus-send).
 it says "me - the usb connection" or "me the dialler" or "me the gps nav
 program" is asking for the cpu to stay on, or suspend. as long as at least
 1 person is asking for the cpu to be on - it stays on. when everyone who
 asked for it to be on removes their "keep it on for me" requests, then
 ompower will allow it to suspend *IF there is any off request in the
 queue. at that point ompower executes "apm -s".

-- 
Ticket URL: <https://docs.openmoko.org/trac/ticket/2008#comment:10>
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