Force kernel to call hotplug script

Refractor · 06-20-2013, 11:36 AM

Greetings, I have an Atheros AP123 reference board with a switch for turning on/off the wireless and a reset button. I'd like to call a script when a button is pressed. I tried creating a test hotplug script (/tmp/hotplug) with the following contents:

Code:

#!/bin/sh
echo $* >> /tmp/hotplug.log
env >> /tmp/hotplug.log

and echo '/tmp/hotplug' > /proc/sys/kernel/hotplug
but when I press a button nothing gets logged. In dmesg however I can see "Reset button pressed." or "WIFI button pressed.". I found where these get echoed (arch/mips/atheros/gpio.c) but my knowledge for the linux kernel ends there. I can modify the source but I'm not sure if I add execve calls to the kernel is a good idea. Perhaps there's some way to make the kernel call hotplug with the button on press. Any help will be greatly appreciated. Thanks!

business_kid · 06-21-2013, 04:38 AM

Try if acpid picks it up. Run acpid with the -l option and it will send events to syslog. You can run 'tail -f /var/log/messages' on another terminal to see.

Refractor · 06-27-2013, 03:29 PM

Thanks for the tip. I ran acpid with -d to dump stuff to stdout, but then I realized that the kernel has no acpi support (no /proc/acpi or /dev/input/event0). Anyway, it's a nice tip, I have another board for a future project and I tested acpid there, it turned out great, so you really helped. Thanks!