dleidert / btn-touch-mod

Linux kernel module to unblank GNOME screensaver on BTN_TOUCH events

btn-touch-mod module

This module is supposed to run a helper script unblank-screen whenever a BTN_TOUCH key event appears. The helper script runs a dbus command to turn off the GNOME screensaver.

Installation

The module is provided as an out-of-tree kernel module installable as Debian dkms package. Just run

apt-get install ./btn-touch-dkms_0.0.1_amd64.deb

Testing

This is how one can test (requires the evemu-tools package):

$ gdbus call --session --dest=org.gnome.ScreenSaver --object-path=/org/gnome/ScreenSaver --method=org.gnome.ScreenSaver.GetActive
(true,)
$ sudo evemu-event /dev/input/by-id/usb-Weida_Hi-Tech_CoolTouch_System-event-if00 --type EV_KEY --code 330 --value 1 --sync
$ sudo evemu-event /dev/input/by-id/usb-Weida_Hi-Tech_CoolTouch_System-event-if00 --type EV_KEY --code 330 --value 0 --sync
$ gdbus call --session --dest=org.gnome.ScreenSaver --object-path=/org/gnome/ScreenSaver --method=org.gnome.ScreenSaver.GetActive
(false,)

And this should appear in the syslog then:

<date> panel1 kernel: [  740.395478] btn_touch_mod: BTN_TOUCH requesting unblanking screen.
<date> panel1 kernel: [  740.395486] btn_touch_mod: BTN_TOUCH unblanking screen successful.

Limitations

The program is hardcoded to set the UID to 1000 and one might need to adjust btn_touch_ids to register for the correct device.

If anybody has some suggestions how to improve it, please feel free to send me your comments.