android60 power显示（亮度等）深入分析（二）DisplayManagerSe

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mDisplayPowerController=newDisplayPowerController(mContext,callbacks,handler,sensorManager,blanker);}}

我们再来看看requestGlobalDisplayStateInternal函数：

[cpp]viewplaincopy在CODE上查看代码片派生到我的代码片

privatevoidrequestGlobalDisplayStateInternal(intstate,intbrightness){if(state==Display.STATE_UNKNOWN){state=Display.STATE_ON;}

if(state==Display.STATE_OFF){

brightness=PowerManager.BRIGHTNESS_OFF;}elseif(brightnessPowerManager.BRIGHTNESS_ON){brightness=PowerManager.BRIGHTNESS_ON;}

synchronized(mTempDisplayStateWorkQueue){try{

//Updatethedisplaystatewithinthelock.

//Notethatwedonotneedtoscheduletraversalsherealthoughit//mayhappenasaside-effectofdisplayschangingstate.synchronized(mSyncRoot){if(mGlobalDisplayState==state

//nochange}Trace.traceBegin(Trace.TRACE_TAG_POWER,\

+Display.stateToString(state)

+\mGlobalDisplayState=state;mGlobalDisplayBrightness=brightness;applyGlobalDisplayStateLocked(mTempDisplayStateWorkQueue);}

//Settingthedisplaypowerstatecantakehundredsofmilliseconds//tocompletesowedeferthemostexpensivepartoftheworkuntil//afterwehaveexitedthecriticalsectiontoavoidblockingother//threadsforalongtime.

for(inti=0;iworkQueue){finalintcount=mDisplayDevices.size();for(inti=0;icolor=0xff000000|(color=LIGHT_COUNT||devices->lights[light]==NULL){return;}

memset(state.color=colorARGB;state.flashMode=flashMode;state.flashOnMS=onMS;state.flashOffMS=offMS;

state.brightnessMode=brightnessMode;

{

ALOGD_IF_SLOW(50,\

devices->lights[light]->set_light(devices->lights[light],}}

而mNativePointer也是调用了init_native函数

[cpp]viewplaincopy在CODE上查看代码片派生到我的代码片staticjlonginit_native(JNIEnv*/*env*/,jobject/*clazz*/){

interr;

hw_module_t*module;Devices*devices;

devices=(Devices*)malloc(sizeof(Devices));

err=hw_get_module(LIGHTS_HARDWARE_MODULE_ID,(hw_module_tconst**)if(err==0){

devices->lights[LIGHT_INDEX_BACKLIGHT]=get_device(module,LIGHT_ID_BACKLIGHT);devices->lights[LIGHT_INDEX_KEYBOARD]=get_device(module,LIGHT_ID_KEYBOARD);devices->lights[LIGHT_INDEX_BUTTONS]=get_device(module,LIGHT_ID_BUTTONS);devices->lights[LIGHT_INDEX_BATTERY]=get_device(module,LIGHT_ID_BATTERY);devices->lights[LIGHT_INDEX_NOTIFICATIONS]=get_device(module,LIGHT_ID_NOTIFICATIONS);devices->lights[LIGHT_INDEX_ATTENTION]=get_device(module,LIGHT_ID_ATTENTION);devices->lights[LIGHT_INDEX_BLUETOOTH]=get_device(module,LIGHT_ID_BLUETOOTH);devices->lights[LIGHT_INDEX_WIFI]=get_device(module,LIGHT_ID_WIFI);}else{

memset(devices,0,sizeof(Devices));}

return(jlong)devices;}

这就到驱动了，最终到hardware目录下有个lights.c文件有下面函数

[cpp]viewincopy在CODE上查看代码片派生到我的代码片staticintopen_lights(conststructhw_module_t*module,charconst*name,structhw_device_t**device){

int(*set_light)(structlight_device_t*dev,structlight_state_tconst*state);

if(0==strcmp(LIGHT_ID_BACKLIGHT,name))set_light=set_light_backlight;

elseif(0==strcmp(LIGHT_ID_NOTIFICATIONS,name))set_light=set_light_leds_notifications;

elseif(0==strcmp(LIGHT_ID_ATTENTION,name))set_light=set_light_leds_attention;

elseif(0==strcmp(LIGHT_ID_BATTERY,name))set_light=set_light_leds_battery;

elseif(0==strcmp(LIGHT_ID_BUTTONS,name))set_light=set_light_keyboard;else

return-EINVAL;

pthread_once(

structlight_device_t*dev=malloc(sizeof(structlight_device_t));memset(dev,0,sizeof(*dev));

dev->common.tag=HARDWARE_DEVICE_TAG;dev->common.version=0;

dev->common.module=(structhw_module_t*)module;

dev->common.close=(int(*)(structhw_device_t*))close_lights;dev->set_light=set_light;

*device=(structhw_device_t*)dev;

return0;}

下面我们再来看set_light_backlight函数：

[cpp]viewplaincopy在CODE上查看代码片派生到我的代码片staticint

set_light_backlight(structlight_device_t*dev,structlight_state_tconst*state){

interr=0;

intbrightness=rgb_to_brightness(state);if(!dev){return-1;}

pthread_mutex_lock(

err=write_int(LCD_FILE,brightness);

pthread_mutex_unlock(returnerr;}其中

[cpp]viewplaincopy在CODE上查看代码片派生