pxa2xx_keypad: enhance emulation of KPAS, KPASMKP regs
Add emulation of KPAS register and proper emulation of KPASMKP regs, so now driver supports multipresses and properly works with Linux driver. Signed-off-by: NVasily Khoruzhick <anarsoul@gmail.com> Signed-off-by: NAurelien Jarno <aurelien@aurel32.net>
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