Power button on beagleboard with Android 2.3.4

steve won86774

Hi,

I would like to generate a keyboard event on Android 2.3.4 and Beagleboard, especialy the power button. I have tried to emulate this with adb, with this command:

adb shell input keyevent 26

Here it is the list of the different events:

http://www.kandroid.org/online-pdk/guide/keymaps_keyboard_input.html

It does not work for me, I have this log:

D/AndroidRuntime( 1951):
D/AndroidRuntime( 1951): >>>>>> AndroidRuntime START com.android.internal.os.RuntimeInit <<<<<<
D/AndroidRuntime( 1951): CheckJNI is ON
D/dalvikvm( 1951): creating instr width table
D/AndroidRuntime( 1951): Calling main entry com.android.commands.input.Input
I/SendKeyEvent( 1951): 26
D/AndroidRuntime( 1951): Shutting down VM
D/dalvikvm( 1951): GC_CONCURRENT freed 98K, 72% free 289K/1024K, external 0K/0K, paused 0ms+1ms
I/AndroidRuntime( 1951): NOTE: attach of thread 'Binder Thread #2' failed
D/jdwp    ( 1951): adbd disconnected

However, I have the event enabled in the file android_rootfs/system/usr/keylayout/qwerty.kl:

key 115   VOLUME_UP         WAKE
key 114   VOLUME_DOWN       WAKE
key 116   POWER             WAKE

Nevertheless, events like VOLUME_UP or VOLUME_DOWN  works well.

I have tested this command with an Android emulator and it works.

Do someone have already done this before and could help me how can I do this?

BR,

Steve.

over 13 years ago

0 Satish Patel over 13 years ago

TI__Expert 4390 points

Hi Steve,

This might help you.

http://processors.wiki.ti.com/index.php/TI-Android-GingerBread-2.3.4-DevKit-2.1_PortingGuides#How_to_designate_a_POWER_key

BR,

satish

0 steve won86774 over 13 years ago in reply to Satish Patel

Prodigy 150 points

Hi,

I've followed instructions from here:

http://e2e.ti.com/support/embedded/android/f/509/t/171383.aspx

I've modified the struct gpio_buttons in the file kernel/arch/arm/mach-omap2/board-omap3beagle.c to add the right code event (116=KEY_POWER), also change the gpio because there is an error into this struct, on beagleboard xm the user button is wired to gpio_4 and not gpio_7.

So now when I do a "long press", about 2/3 seconds, a menu appears with different items, like silent mode, airplane mode and power off.

If I launch a getevent on the shell, I have it:

# getevent
getevent
add device 1: /dev/input/event3
  name:     "DELL Dell USB Entry Keyboard"
add device 2: /dev/input/event2
  name:     "Logitech USB Optical Mouse"
could not get driver version for /dev/input/mouse0, Not a typewriter
could not get driver version for /dev/input/mice, Not a typewriter
add device 3: /dev/input/event0
  name:     "gpio-keys"
add device 4: /dev/input/event1
  name:     "twl4030_pwrbutton"
/dev/input/event0: 0001 0074 00000001
/dev/input/event0: 0000 0000 00000000
/dev/input/event0: 0001 0074 00000000
/dev/input/event0: 0000 0000 00000000

Ok so the event is well send by the kernel, with 0074 = 116 = KEY_POWER.

But on the Android side I have this log:

W/KeyCharacterMap( 1088): Can't open keycharmap file
W/KeyCharacterMap( 1088): Error loading keycharmap file '/system/usr/keychars/gpio-keys.kcm.bin'. hw
.keyboards.65538.devname='gpio-keys'
W/KeyCharacterMap( 1088): Using default keymap: /system/usr/keychars/qwerty.kcm.bin

This file is not present, but the default qwerty works for this event.

Ok, so it works, but it miss something!

In deed, my concern is not this behaviour but more putting the screen off. If I do a short push on this button, the screen should go off, but there is nothing that happend...

The event is however well sent by the kernel but it seems that the Android layer drop this event. I don't know the Android framework, there's should be somewhere a method that count the time between the press button event and release button event.

Someone could help me to find how to put the screen off when I press this button?

BR,

Steve.

0 RajeeSankar over 13 years ago in reply to steve won86774

Intellectual 270 points

Hi Steve,

We are also facing the same issue.

Long press is powering off the system.We need short press to dim LCD.

Any help?

Regards,

RajeeSankar

0 Arun Joseph over 13 years ago in reply to RajeeSankar

TI__Expert 7220 points

Hi Steve/RajeeSankar,

Now you have your gpio key sending KEY_POWER and android recognizes the event from qwerty.kl, so it works well.

Now to enable suspend-resume we need to enable power management via

Replace the line "setprop hw.nopm true" with "setprop hw.nopm false" init.rc.
Uncheck Settings-> Applications-> Development-> Stay awake

There are some more steps to be done from kernel to support suspend-resume for Beagleboard. Please pick the relevant patches from http://groups.google.com/group/rowboat/browse_thread/thread/1a950d7ae3b1f339#

We will push these patches to gitorious.org/rowboat soon.

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Power button on beagleboard with Android 2.3.4