修改添加按键KEY_EVENT

1.在frameworks/base/core/java/android/view/KeyEvent.java中添加键值,病修改LAST_KEYCODE

    /* And W key for Winew*/
    public static final int KEYCODE_WKEY   = 263;

    private static final int LAST_KEYCODE = KEYCODE_WKEY;

2.在frameworks/native/include/android/keycodes.h添加和KeyEvent.java中对应键值的AKEY

AKEYCODE_WKEY            = 263

3.frameworks/native/include/input/InputEventLabels.h的KEYCODES数组中添加DEFINE_KEYCODE

static const InputEventLabel KEYCODES[] = {
...
    DEFINE_KEYCODE(WKEY),
    { NULL, 0 }
};

4.在例如device/qcom/l932/gpio-keys.kl的kl文件中添加和驱动硬件对应的gpio的键值

一定要确保在kl文件中定义的键在上层framework中有定义，不然会在加载kl文件的时候报错。

key 250   WKEY

5.查看驱动按键消息

apu@apu-pc:~/l910$ adb root
restarting adbd as root
apu@apu-pc:~/l910$ adb remount
remount succeeded
apu@apu-pc:~/l910$ adb shell
root@550:/ # getevent
add device 1: /dev/input/event5
  name:     "msm8x10-skuaa-snd-card Headset Jack"
add device 2: /dev/input/event4
  name:     "msm8x10-skuaa-snd-card Button Jack"
add device 3: /dev/input/event3
  name:     "qpnp_pon"
add device 4: /dev/input/event2
  name:     "accelerometer"
add device 5: /dev/input/event1
  name:     "speed_keypad"
add device 6: /dev/input/event0
  name:     "synaptics_rmi4_i2c"
^C
130|root@550:/ # getevent -lt /dev/input/event1
[     887.617253] EV_KEY       KEY_F7               DOWN                
[     887.617297] EV_SYN       SYN_REPORT           00000000            
[     887.861869] EV_KEY       KEY_F7               UP                                 
[     895.531064] EV_SYN       SYN_REPORT           00000000            
[     896.273882] EV_KEY       KEY_REPLY            DOWN                
[     896.273923] EV_SYN       SYN_REPORT           00000000            
[     896.518718] EV_KEY       KEY_REPLY            UP