How to set HOME key as wake up key

[DESCRIPTION]

How to set HOME key as wake up key

[SOLUTION]

MT6572平台的路径有做修改：
1、set keypad as wakeup source
确认在mediatek\platform\mt6572\kernel\core\mt_spm_suspend.c文件
WAKE_SRC_FOR_SUSPEND 宏定义和
mediatek\platform\mt6572\kernel\core\mt_spm_dpidle.c文件
WAKE_SRC_FOR_DPIDLE 宏定义里是否都有包含了WAKE_SRC_KP
2、set wake flag for home key
mediatek/config/<project>/mtk-kpd.kl
key 102 HOME ===>key 102 HOME WAKE
3、modify keypad GPIO setting in suspend&resume
mediatek/platform/mt6572/kernel/drivers/keypad/kpd.c
-针对除了HOME key之外的keypad GPIO做如下配置：
In suspend:
-Set KCOL GPIO as GPIO mode,input,pull-down;
-Set KROW GPIO as GPIO mode,output high;
In resume:
-set KCOL GPIO as keypad mode,input,pull-up;
-set KROW GPIO as keypad mode,output;
-将kpd_pdrv_suspend&kpd_pdrv_resume always enable
-Remove "#ifndef CONFIG_HAS_EARLYSUSPEND...."
4、使用Volume up as wake up key
-之前步骤保证了任意键盘键能唤醒kernel,但android php?mod=tag&id=6090" target="_blank" class="relatedlink">Framework 屏蔽了若干特殊按键，而使
用的Volume Up 正在其中，解决方法如下：
将alps/frameworks/base/policy/src/com/android/internal/policy/impl下的
PhoneWindowManager.java文件中isWakeKeyWhenScreenOff()函数中KEYCODE_VOLUME_UP
和KEYCODE_VOLUME_DOWN这两行删除掉就可以了.