[root@armadillo440-0 (ttymxc1) ~]# evtest /dev/input/event0
Input driver version is 1.0.1
Input device ID: bus 0x19 vendor 0x1 product 0x1 version 0x100
Input device name: "gpio-keys"
Supported events:
  Event type 0 (Sync)
  Event type 1 (Key)
    Event code 28 (Enter)
    Event code 102 (Home)
    Event code 139 (Menu)
    Event code 158 (Back)
Testing ... (interrupt to exit)

//この間sw0〜LCD_sw3を順番に押しています

[root@armadillo440-0 (ttymxc1) ~]#