Hi Prasad,
Command ANDROID_ALARM_ELAPSED_REALTIME can't wake up system.
You can try ANDROID_ALARM_ELAPSED_REALTIME_WAKEUP command, and you should
confirm whether the real rtc chip on your platform supports wakeup function
and the rtc driver enables it.
Because the android alarm is just a virtual driver, it will finally call
the real rtc driver to set alarm to the chip.
Thanks
Gary
在 2013年10月1日星期二UTC+8上午3时15分41秒，Guru Prasad写道：
>
> Hi,
>
> I'm working with a fairly old version of the Linux kernel (v3.0) on
> the Android platform (4.1.1_r4).
>
> From my understanding, it should be possible to wake the system from
> suspend so as long as I can
> request an alarm from ANDROID_ALARM_ELAPSED_REALTIME
>
> I'm trying to look at the Android platform AlarmManager code; both
> Java and native, to try and figure out exactly how I'm supposed to use
> this interface.
>
> So far, after looking at
> frameworks/base/services/jni/com_android_server_AlarmManagerService.cpp
> frameworks/base/services/java/com/android/server/AlarmManagerService.java
>
> I'm now trying to set an alarm using something like
> struct timespec ts;
> ts.tv_nsec = 0;
> ts.tv_sec = 15;
>
> int alarm_fd = open("/dev/alarm", O_RDWR);
> int result = ioctl(alarm_fd,
> ANDROID_ALARM_SET(ANDROID_
> ALARM_ELAPSED_REALTIME), &ts);
>
>
> However, upon execution, kmsg shows me the following
> [ 430.304171] alarm_release: clear alarm, pending 0
>
>
> I've also confirmed that the device does not wake up from suspend
> using the above snippet.
>
> I'm not sure what I'm doing wrong..I've tried to replicate most of what
> the AlarmMAnagerService.cpp is doing..
>
>
> I would greatly appreciate it if someone could help me with the Android
> alarm interface
>
>
> Thanks
>
>
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