>> when the PowerManagerService( >>PowerManagerSerivce.java) write "on" to /sys/power/state (using SetScreenState(true) ),
Note that in android (for that matter, universally in java) java applications cant access system resources (sys/power/state file in this case) directly, as they have to bypass VM (dalvik in android). so, usually its java-app -> JNI -> native library -> kernel component so, the sysfs entry sys/poewr/state will be updated in kernel component finally. the call sequence will be like com.android.PowerManagerSerivce => android.app.ActivityManagerNative => JNI => ... => kernel power -> writing /sys/power/state btw, "ON" is not supported in /sys/power/state, and supported state are 'standby' (Power-On Suspend) 'mem' (Suspend-to-RAM) 'disk' (Suspend-to-Disk). System enters either of the above state, when user says so, and system will resume on a scheduled event or user input.. On Tue, Apr 6, 2010 at 1:12 PM, ZhangJieJing <kzj...@gmail.com> wrote: > Hi All: > > At android power manage service, it have early suspend and late resume > mechanism to control devices such as LCD backlight, touchscreen, when wake > lock free/expired or user request suspend, the kernel will call early > suspend workqueue, and execute the registered early suspend handler. when > the user(PowerManageService) request "on" (echo "on" > /sys/power/state) , > the late resume handlers will be called. > > My question is, > 1, when the PowerManagerService(PowerManagerSerivce.java) write "on" to > /sys/power/state (using SetScreenState(true) ), > 2, and how the services know the resume of system to write /sys/power/state > ? > > Thanks in advance, > > --- > Best regards, > Zhang Jiejing > > -- > unsubscribe: > android-porting+unsubscr...@googlegroups.com<android-porting%2bunsubscr...@googlegroups.com> > website: http://groups.google.com/group/android-porting > -- unsubscribe: android-porting+unsubscr...@googlegroups.com website: http://groups.google.com/group/android-porting To unsubscribe, reply using "remove me" as the subject.
