My HP 8150w laptop has this neat lis3lv02d accelerometer to be able to detect when it's falling and to park the harddisk to prevent damage. I use this instrument to detect whether I'm on the road or at the office. This way, I can set preferences at boot-time, even before the network settings are loaded.
I have added a few scripts to my initrd, which are not very interesting. But what is, is the driver required to do this.
I created a file named /etc/dracut.conf.d/tilt.conf which contains:
add_drivers="$add_drivers hp_accel lis3lv02d input_polldev"
After creating a new initrd by running dracut, my scripts can see the x/y/z tilt of the machine by reading from /sys/devices/platform/lis3lv02d/position
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