android2.3 -添加自定义按键：作唤醒功能 .

最近需要做个唤醒功能，当按键的时候android系统唤醒并点亮屏，在长按键中，系统不能在进入睡眠。

驱动方面：
1：在平台设备文件中添加 一个按键，定义为唤醒源！
archarmmach-s5pv210
static struct gpio_keys_button gpio_buttons[] = {

    {
  .gpio  = S5PV210_GPH1(3),
   .code  = KEY_F22,  //对应 192
   .desc  = "F22",
   .active_low = 1,
   .wakeup  = 1,
   .debounce_interval =100, //去抖动
    },

}



static struct gpio_keys_platform_data gpio_button_data = {
 .buttons = gpio_buttons,
 .nbuttons = ARRAY_SIZE(gpio_buttons),
};

static struct platform_device s3c_device_gpio_button = {
 .name  = "gpio-keys",
 .id  = -1,
 .num_resources = 0,
 .dev  = {
  .platform_data = &gpio_button_data,
 }
};

platform_add_devices(smdkc110_devices, ARRAY_SIZE(smdkc110_devices));


2:添加驱动kernel-v.20120620driversinputkeyboards3c-gpio-keys.c
struct s3c_gpio_key{
    int pin;
    int eint;
    int eintcfg;
    int inputcfg;
};

struct s3c_gpio_key s3c_gpio_keys[]=
{
        ///*
      {
              .pin = S5PV210_GPH1(3), //at base wake up
              .eintcfg = 0X0f<<12,
              .inputcfg = 0<<12,
              .eint = IRQ_EINT11,
      },

     // */
};

驱动方面：
1：在平台设备文件中添加 一个按键，定义为唤醒源！
archarmmach-s5pv210
static struct gpio_keys_button gpio_buttons[] = {

    {
  .gpio  = S5PV210_GPH1(3),
   .code  = KEY_F22,  //对应 192 
   .desc  = "F22",
   .active_low = 1,
   .wakeup  = 1,
   .debounce_interval =100, //去抖动
    },

}



static struct gpio_keys_platform_data gpio_button_data = {
 .buttons = gpio_buttons,
 .nbuttons = ARRAY_SIZE(gpio_buttons),
};

static struct platform_device s3c_device_gpio_button = {
 .name  = "gpio-keys",
 .id  = -1,
 .num_resources = 0,
 .dev  = {
  .platform_data = &gpio_button_data,
 }
};

platform_add_devices(smdkc110_devices, ARRAY_SIZE(smdkc110_devices));


2:添加驱动kernel-v.20120620driversinputkeyboards3c-gpio-keys.c
struct s3c_gpio_key{
	int pin;
	int eint;
	int eintcfg;
	int inputcfg;
};

struct s3c_gpio_key s3c_gpio_keys[]=
{	
        ///*
      { 
              .pin = S5PV210_GPH1(3), //at base wake up
              .eintcfg = 0X0f<<12,      
              .inputcfg = 0<<12,
              .eint = IRQ_EINT11,
      },
      
     // */
};

//申请中断为上/下沿出发方式。

error = request_irq(s3c_gpio_keys[i].eint, gpio_keys_isr,
            IRQF_SAMPLE_RANDOM | IRQF_TRIGGER_RISING |
            IRQF_TRIGGER_FALLING,
            button->desc ? button->desc : "gpio_keys",
            bdata);

		error = request_irq(s3c_gpio_keys[i].eint, gpio_keys_isr,
				    IRQF_SAMPLE_RANDOM | IRQF_TRIGGER_RISING |
					IRQF_TRIGGER_FALLING,
				    button->desc ? button->desc : "gpio_keys",
				    bdata);

static void gpio_keys_report_event(struct gpio_button_data *bdata)
{
    struct gpio_keys_button *button = bdata->button;
    struct input_dev *input = bdata->input;
    unsigned int type = button->type ?: EV_KEY;

    int state = (gpio_get_value(button->gpio) ? 1 : 0) ^ button->active_low;
    //add by xiao@2012-0620:for wake up mid when it on base.
    //上报事件处理下，因会发生系统唤醒后，又马上进入睡眠，造成一种假唤醒状态，所以当按键时，不时上报此事件来唤醒系统
    if(button->code == 192){
        if(state)
           mod_timer(&bdata->timer,
            jiffies + msecs_to_jiffies(button->debounce_interval + 300));
    }
    input_event(input, type, button->code, !!state);
    input_sync(input);
    #ifdef key_debug
    printk("gpio_keys_report_event->code =%d, state = %d
",button->code,state);
    #endif
}

static void gpio_keys_report_event(struct gpio_button_data *bdata)
{
	struct gpio_keys_button *button = bdata->button;
	struct input_dev *input = bdata->input;
	unsigned int type = button->type ?: EV_KEY;

	int state = (gpio_get_value(button->gpio) ? 1 : 0) ^ button->active_low;
    //add by xiao@2012-0620:for wake up mid when it on base.
    //上报事件处理下，因会发生系统唤醒后，又马上进入睡眠，造成一种假唤醒状态，所以当按键时，不时上报此事件来唤醒系统
    if(button->code == 192){
        if(state)
           mod_timer(&bdata->timer,
			jiffies + msecs_to_jiffies(button->debounce_interval + 300));
    }
    input_event(input, type, button->code, !!state);
	input_sync(input);
	#ifdef key_debug
	printk("gpio_keys_report_event->code =%d, state = %d
",button->code,state);
	#endif
}

驱动按键添加完成，内核能唤醒，但是android系统屏并不会点亮，所以需要修改源码，让系统服务获取到此按键并作一些处理。

1：首先看下键值表：out argetproductsmdkv210systemusrkeylayout

qwerty.kl

# On an AT keyboard: ESC, F10
key 1     BACK              WAKE_DROPPED
key 68    MENU              WAKE_DROPPED

# on base wake up mid
key 192     NULL         WAKE_DROPPED   //需要添加的键NULL。WAKE_DROPPED：唤醒并点亮屏。

第一列：key
第二列: SCANCODE是一个整数，是驱动里面定义的，在文件./kernel/include/linux/input.h
第三列: KEYCODE 是一个字串，定义在你描述的布局文件frameworks/base/include/ui/KeycodeLabels.h
另外可以设置相关的FLAGS:
SHIFT: 当按下，自动加上SHIFT键值
ALT:当按下，自动加上ALT
CAPS:当按下，自动带上CAPS大写
WAKE:当按下，当设备进入睡眠的时候，按下这个键将唤醒，而且发送消息给应用层。
WAKE_DROPPED:当按下，且设备正处于睡眠，设备被唤醒，但是不发送消息给应用层。

2：./frameworks/base/include/ui/keycodeLabels.h

static const KeycodeLabel KEYCODES[] = {
    { "BUTTON_MODE", 110 },
    { "NULL", 111 }, //在最后添加NULL按键， 键值为111 ，后续android根据键值来映射。    
    // NOTE: If you add a new keycode here you must also add it to several other files.
    //       Refer to frameworks/base/core/java/android/view/KeyEvent.java for the full list.

    { NULL, 0 }
};

3： ./ frameworks/base/native/include/android/Keycodes.h   

enum {
    AKEYCODE_BUTTON_MODE     = 110,
    AKEYCODE_NULL     = 111, //     当keyevent处理按键事件时，isSystemKey 判断是否为系统按键才会继续上报上层，所以需要添加进去。
    // NOTE: If you add a new keycode here you must also add it to several other files.
    //       Refer to frameworks/base/core/java/android/view/KeyEvent.java for the full list.
};

./frameworks/base/libs/ui/input.java

   同时 isSystemKey() 也要添加：

bool KeyEvent::isSystemKey(int32_t keyCode) {
    switch (keyCode) {
        case AKEYCODE_FOCUS:
        case AKEYCODE_SEARCH:
  case AKEYCODE_NULL: // add by xiao@2012-06-20
            return true;
    }
   
    return false;
}

4： ./frameworks/base/core/java/android/view/KeyEvent.java

  //根据键值 映射 为 KEYCODE_BUTTON_NULL  ，为PhoneWindowManager.java 提供按键目标。
    public static final int KEYCODE_BUTTON_NULL     = 111;

 同时 这也修改：

 private static final int LAST_KEYCODE           = KEYCODE_BUTTON_NULL;

5：./frameworks/base/core/res/res/values/attrs.xml
        <enum name="KEYCODE_BUTTON_MODE" value="110" />
        <enum name="KEYCODE_BUTTON_NULL" value="111" />

通过以上的更改，新的键值就添加上去了，由于更改了 KeyEvent，影响到了API， 所以需要make update-api

这样系统就会获取到这个NULL按键，并能够点亮屏幕了。

如果对新键值进行处理，可以通过获取相应的keycode，对它进行处理；对于按键事件的处理一般如下文件中
 frameworks/policies/base/phone/com/android/internal/policy/impl/PhoneWindowManager.java

interceptKeyBeforeQueueing 函数中处理，

public int interceptKeyBeforeQueueing(long whenNanos, int keyCode, boolean down,
           int policyFlags, boolean isScreenOn) {


    //add by xiao@2012-06-20 :wakeup mid when it on base,
    else if(keyCode == KeyEvent.KEYCODE_BUTTON_NULL){ //获取NULL按键，不让系统进入睡眠状态，释放按键时，进入可睡眠。
        if(down){
            if(IS_MID_ONBASE == false)
            {
                IS_MID_ONBASE = true;
                mBroadcastWakeLock.acquire();
                Log.e(TAG,"MID WAKE UP button: DOwn");
            }
        }else{
            IS_MID_ONBASE = false;
            mBroadcastWakeLock.release();
            Log.e(TAG,"MID WAKE UP button: release");
        }
    }

     }

 public int interceptKeyBeforeQueueing(long whenNanos, int keyCode, boolean down,
            int policyFlags, boolean isScreenOn) {


		//add by xiao@2012-06-20 :wakeup mid when it on base,
		else if(keyCode == KeyEvent.KEYCODE_BUTTON_NULL){ //获取NULL按键，不让系统进入睡眠状态，释放按键时，进入可睡眠。
			if(down){
				if(IS_MID_ONBASE == false)
				{
					IS_MID_ONBASE = true;
					mBroadcastWakeLock.acquire();
					Log.e(TAG,"MID WAKE UP button: DOwn");
				}
			}else{
				IS_MID_ONBASE = false;
				mBroadcastWakeLock.release();
				Log.e(TAG,"MID WAKE UP button: release");
			}
		}

      }