Adding a special key for touchpad toggle

[Corentin Chary]

Hi,
in drivers/platform/x86/ there is 3 drivers who need a key to toggle
the touchpad:
- topstar-laptop.c: mapped to KEY_F13
- asus-laptop.c: mapped to BTN_TOUCH, don't know why
- eeepc-laptop.c: I didn't do the patch yet, because I don't know what
key to use

Do you think we need a new key ? (KEY_TOUCHPAD)
Should we use KEY_F13 in all drivers ?
Thanks,
-- 
Corentin Chary
http://xf.iksaif.net
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