Android Light开发（二） 通知灯调用过程

  Android中有各种灯，背光灯，按键灯，指示灯，等等；前几天修改了这部分代码，整理下思路，其实都不难；

       首先，来说说指示灯（提示灯），即未接电话，未接短信的时候，会闪灯，这个其实就是NotificationManager这个类中的notify（）方法来处理的；流程简单来过一下：

       Step 1：从应用层发送的notify（），到framework层被NotificationManager.java这个类接受了，来看看这个notify（）这个方法：

 public void notify(int id, Notification notification)
     {
         notify(null, id, notification);
     }

 public void notify(String tag, int id, Notification notification)
    {
        int[] idOut = new int[1];
        INotificationManager service = getService();
        String pkg = mContext.getPackageName();
        if (notification.sound != null) {
            notification.sound = notification.sound.getCanonicalUri();
        }
        if (localLOGV) Log.v(TAG, pkg + ": notify(" + id + ", " + notification + ")");
        try {
            service.enqueueNotificationWithTag(pkg, tag, id, notification, idOut,
                    UserHandle.myUserId());
            if (id != idOut[0]) {
                Log.w(TAG, "notify: id corrupted: sent " + id + ", got back " + idOut[0]);
            }
        } catch (RemoteException e) {
        }
    }

重点关注这个enqueueNotificationWithTag（）这个方法，这个方法首先会取是否传递过来了声音的Uri，如果传递了，就保存下来，给等会播放用；

     Step 2：enqueueNotificationWithTag（）这个方法调用到了NotificationManagerService.java这个类中去了，来看看这个方法：

 public void enqueueNotificationWithTag(String pkg, String tag, int id, Notification notification,
             int[] idOut, int userId)
     {
         enqueueNotificationInternal(pkg, Binder.getCallingUid(), Binder.getCallingPid(),
                 tag, id, notification, idOut, userId);
     }

 // Not exposed via Binder; for system use only (otherwise malicious apps could spoof the
     // uid/pid of another application)
     public void enqueueNotificationInternal(String pkg, int callingUid, int callingPid,
             String tag, int id, Notification notification, int[] idOut, int userId)
     {
         if (DBG) {
             Slog.v(TAG, "enqueueNotificationInternal: pkg=" + pkg + " id=" + id + " notification=" + notification + ", notification.ledARGB : "+ notification.ledARGB);
         }
         checkCallerIsSystemOrSameApp(pkg);
         final boolean isSystemNotification = ("android".equals(pkg));

         userId = ActivityManager.handleIncomingUser(callingPid,
                 callingUid, userId, true, false, "enqueueNotification", pkg);
         UserHandle user = new UserHandle(userId);

         // Limit the number of notifications that any given package except the android
         // package can enqueue.  Prevents DOS attacks and deals with leaks.
         if (!isSystemNotification) {
             synchronized (mNotificationList) {
                 int count = 0;
                 int eldestIdx = 0;
                 long eldestTime = 0;
                 final int N = mNotificationList.size();
                 for (int i=0; i<N; i++) {
                     NotificationRecord r = mNotificationList.get(i);
                     if (r.pkg.equals(pkg) && r.userId == userId) {
                         if (count == 0) {
                             eldestTime = r.notification.when;
                             eldestIdx = i;
                         }
                         else {
                             if (r.notification.when < eldestTime) {
                                 eldestTime = r.notification.when;
                                 eldestIdx = i;
                             }
                         }
                         count++;
                         if (count >= MAX_PACKAGE_NOTIFICATIONS) {
                             Slog.e(TAG, "Package has already posted " + count
                                     + " notifications.  Not showing more.  package=" + pkg);
                             //return;
                             // [ALPS00447419] SystemUI OOM: remove eldest entry
                             r = mNotificationList.get(eldestIdx);
                             mNotificationList.remove(eldestIdx);
                             cancelNotificationLocked(r, true);
                             break;
                         }
                     }
                 }
             }
         }

         // This conditional is a dirty hack to limit the logging done on
         //     behalf of the download manager without affecting other apps.
         if (!pkg.equals("com.android.providers.downloads")
                 || Log.isLoggable("DownloadManager", Log.VERBOSE)) {
             EventLog.writeEvent(EventLogTags.NOTIFICATION_ENQUEUE, pkg, id, tag, userId,
                     notification.toString());
         }

         if (pkg == null || notification == null) {
             throw new IllegalArgumentException("null not allowed: pkg=" + pkg
                     + " id=" + id + " notification=" + notification);
         }
         if (notification.icon != 0) {
             if (notification.contentView == null) {
                 throw new IllegalArgumentException("contentView required: pkg=" + pkg
                         + " id=" + id + " notification=" + notification);
             }
         }

         // === Scoring ===

         // 0. Sanitize inputs
         notification.priority = clamp(notification.priority, Notification.PRIORITY_MIN, Notification.PRIORITY_MAX);
         // Migrate notification flags to scores
         if (0 != (notification.flags & Notification.FLAG_HIGH_PRIORITY)) {
             if (notification.priority < Notification.PRIORITY_MAX) notification.priority = Notification.PRIORITY_MAX;
         } else if (SCORE_ONGOING_HIGHER && 0 != (notification.flags & Notification.FLAG_ONGOING_EVENT)) {
             if (notification.priority < Notification.PRIORITY_HIGH) notification.priority = Notification.PRIORITY_HIGH;
         }

         // 1. initial score: buckets of 10, around the app
         int score = notification.priority * NOTIFICATION_PRIORITY_MULTIPLIER; //[-20..20]

         // 2. Consult external heuristics (TBD)

         // 3. Apply local rules

         // blocked apps
         if (ENABLE_BLOCKED_NOTIFICATIONS && !isSystemNotification && !areNotificationsEnabledForPackageInt(pkg)) {
             score = JUNK_SCORE;
             Slog.e(TAG, "Suppressing notification from package " + pkg + " by user request.");
         }

         if (DBG) {
             Slog.v(TAG, "Assigned score=" + score + " to " + notification);
         }

         if (score < SCORE_DISPLAY_THRESHOLD) {
             // Notification will be blocked because the score is too low.
             return;
         }

         // Should this notification make noise, vibe, or use the LED?
         final boolean canInterrupt = (score >= SCORE_INTERRUPTION_THRESHOLD);

         synchronized (mNotificationList) {
             NotificationRecord r = new NotificationRecord(pkg, tag, id,
                     callingUid, callingPid, userId,
                     score,
                     notification);
             NotificationRecord old = null;

             int index = indexOfNotificationLocked(pkg, tag, id, userId);
             if (index < 0) {
                 mNotificationList.add(r);
             } else {
                 old = mNotificationList.remove(index);
                 mNotificationList.add(index, r);
                 // Make sure we don't lose the foreground service state.
                 if (old != null) {
                     notification.flags |=
                         old.notification.flags&Notification.FLAG_FOREGROUND_SERVICE;
                 }
             }

             // Ensure if this is a foreground service that the proper additional
             // flags are set.
             if ((notification.flags&Notification.FLAG_FOREGROUND_SERVICE) != 0) {
                 notification.flags |= Notification.FLAG_ONGOING_EVENT
                         | Notification.FLAG_NO_CLEAR;
             }

             final int currentUser;
             final long token = Binder.clearCallingIdentity();
             try {
                 currentUser = ActivityManager.getCurrentUser();
             } finally {
                 Binder.restoreCallingIdentity(token);
             }

             if (notification.icon != 0) {
                 final StatusBarNotification n = new StatusBarNotification(
                         pkg, id, tag, r.uid, r.initialPid, score, notification, user);
                 if (old != null && old.statusBarKey != null) {
                     r.statusBarKey = old.statusBarKey;
                     long identity = Binder.clearCallingIdentity();
                     try {
                         mStatusBar.updateNotification(r.statusBarKey, n);
                     }
                     finally {
                         Binder.restoreCallingIdentity(identity);
                     }
                 } else {
                     long identity = Binder.clearCallingIdentity();
                     try {
                         r.statusBarKey = mStatusBar.addNotification(n);
                         if ((n.notification.flags & Notification.FLAG_SHOW_LIGHTS) != 0
                                 && canInterrupt) {
                             mAttentionLight.pulse();
                         }
                     }
                     finally {
                         Binder.restoreCallingIdentity(identity);
                     }
                 }
                 // Send accessibility events only for the current user.
                 if (currentUser == userId) {
                     sendAccessibilityEvent(notification, pkg);
                 }
             } else {
                 Slog.e(TAG, "Ignoring notification with icon==0: " + notification);
                 if (old != null && old.statusBarKey != null) {
                     long identity = Binder.clearCallingIdentity();
                     try {
                         mStatusBar.removeNotification(old.statusBarKey);
                     }
                     finally {
                         Binder.restoreCallingIdentity(identity);
                     }
                 }
             }

             // If we're not supposed to beep, vibrate, etc. then don't.
             // ensure mms can send notification when a phone is calling
             if ((((mDisabledNotifications & StatusBarManager.DISABLE_NOTIFICATION_ALERTS) == 0) || pkg.equals("com.android.mms"))
                     && (!(old != null
                         && (notification.flags & Notification.FLAG_ONLY_ALERT_ONCE) != 0 ))
                     && (r.userId == UserHandle.USER_ALL ||
                         (r.userId == userId && r.userId == currentUser))
                     && canInterrupt
                     && mSystemReady) {
                 ///M:
                 if (DBG) {
                     Log.d(TAG,"pakage="+pkg+",In NotificationMangerService, this notification soud, leds and vibrate enable");
                 }
                 final AudioManager audioManager = (AudioManager) mContext
                 .getSystemService(Context.AUDIO_SERVICE);

                 // sound
                 final boolean useDefaultSound =
                     (notification.defaults & Notification.DEFAULT_SOUND) != 0;
                 ///M: log sound information
                 if (DBG) {
                     Log.d(TAG,"useDefaultSound="+useDefaultSound);
                     Log.d(TAG,"notification.sound="+notification.sound);
                 }

                 Uri soundUri = null;
                 boolean hasValidSound = false;

                 if (useDefaultSound) {
                     soundUri = Settings.System.DEFAULT_NOTIFICATION_URI;

                     // check to see if the default notification sound is silent
                     ContentResolver resolver = mContext.getContentResolver();
                     hasValidSound = Settings.System.getString(resolver,
                            Settings.System.NOTIFICATION_SOUND) != null;
                 } else if (notification.sound != null) {
                     soundUri = notification.sound;
                     hasValidSound = (soundUri != null);
                 }

                 if (hasValidSound) {
                     boolean looping = (notification.flags & Notification.FLAG_INSISTENT) != 0;
                     int audioStreamType;
                     if (notification.audioStreamType >= 0) {
                         audioStreamType = notification.audioStreamType;
                     } else {
                         audioStreamType = DEFAULT_STREAM_TYPE;
                     }
                     mSoundNotification = r;
                     ///M: log sound information
                     if (DBG) {
                         Log.d(TAG,"looping="+looping);
                         Log.d(TAG,"audioStreamType="+audioStreamType);
                         Log.d(TAG,"StreamVolume="+audioManager.getStreamVolume(audioStreamType));
                     }
                     // do not play notifications if stream volume is 0
                     // (typically because ringer mode is silent) or if speech recognition is active.
                     if ((audioManager.getStreamVolume(audioStreamType) != 0)
                             && !audioManager.isSpeechRecognitionActive()) {
                         final long identity = Binder.clearCallingIdentity();
                         try {
                             final IRingtonePlayer player = mAudioService.getRingtonePlayer();
                             if (player != null) {
                                 ///M: [ALPS00461691]No notification sound when it detects wifi networks
                                 if (user.getIdentifier() == UserHandle.USER_ALL) {
                                     user = UserHandle.OWNER;
                                 }
                                 player.playAsync(soundUri, user, looping, audioStreamType);
                             }
                         } catch (RemoteException e) {
                         } finally {
                             Binder.restoreCallingIdentity(identity);
                         }
                     }
                 }

                 // vibrate
                 ///M: for device manager
                 if (DBG) {
                     Log.d(TAG,"mDmLock="+mDmLock);
                 }
                 if (mDmLock == false){
                 // Does the notification want to specify its own vibration?
                 final boolean hasCustomVibrate = notification.vibrate != null;

                 // new in 4.2: if there was supposed to be a sound and we're in vibrate mode,
                 // and no other vibration is specified, we fall back to vibration
                 final boolean convertSoundToVibration =
                            !hasCustomVibrate
                         && hasValidSound
                         && (audioManager.getRingerMode() == AudioManager.RINGER_MODE_VIBRATE);

                 // The DEFAULT_VIBRATE flag trumps any custom vibration AND the fallback.
                 final boolean useDefaultVibrate =
                         (notification.defaults & Notification.DEFAULT_VIBRATE) != 0;

                 if ((useDefaultVibrate || convertSoundToVibration || hasCustomVibrate)
                         && !(audioManager.getRingerMode() == AudioManager.RINGER_MODE_SILENT)) {
                     mVibrateNotification = r;

                     if (DBG) {
                         Log.w(TAG, "set vibrate!");
                     }

                     if (useDefaultVibrate || convertSoundToVibration) {
                         // Escalate privileges so we can use the vibrator even if the notifying app
                         // does not have the VIBRATE permission.
                         long identity = Binder.clearCallingIdentity();
                         try {
                             mVibrator.vibrate(useDefaultVibrate ? mDefaultVibrationPattern
                                                                 : mFallbackVibrationPattern,
                                 ((notification.flags & Notification.FLAG_INSISTENT) != 0) ? 0: -1);
                         } finally {
                             Binder.restoreCallingIdentity(identity);
                         }
                     } else if (notification.vibrate.length > 1) {
                         // If you want your own vibration pattern, you need the VIBRATE permission
                         mVibrator.vibrate(notification.vibrate,
                             ((notification.flags & Notification.FLAG_INSISTENT) != 0) ? 0: -1);
                     }
                 }
                 } // mDmLock == false
             }

             // this option doesn't shut off the lights

             // light
             // the most recent thing gets the light
             mLights.remove(old);
             if (mLedNotification == old) {
                 mLedNotification = null;
             }
             //Slog.i(TAG, "notification.lights="
             //        + ((old.notification.lights.flags & Notification.FLAG_SHOW_LIGHTS) != 0));
             if ((notification.flags & Notification.FLAG_SHOW_LIGHTS) != 0
                     && canInterrupt) {
                 mLights.add(r);
                 updateLightsLocked();
             } else {
                 if (old != null
                         && ((old.notification.flags & Notification.FLAG_SHOW_LIGHTS) != 0)) {
                     updateLightsLocked();
                 }
             }
         }

         idOut[0] = id;
     }

上面这个方法做的操作有点多，代码有300多行。其中有设计播放声音的地方：

 <span style="font-size:18px;"> player.playAsync(soundUri, user, looping, audioStreamType);</span>

有是否播放震动的地方：

 mVibrator.vibrate(notification.vibrate,
                            ((notification.flags & Notification.FLAG_INSISTENT) != 0) ? 0: -1);

最后闪灯的地方在这个逻辑中：

 if ((notification.flags & Notification.FLAG_SHOW_LIGHTS) != 0
                    && canInterrupt) {
                mLights.add(r);
                updateLightsLocked();
            }

重点看updateLightsLocked（）这个方法，这个方法里面有逻辑的操作；

       Step 3：updateLightsLocked（）这个方法的代码如下：

 // lock on mNotificationList
     private void updateLightsLocked()
     {
         // handle notification lights
         if (mLedNotification == null) {
             // get next notification, if any
             int n = mLights.size();
             if (n > 0) {
                 mLedNotification = mLights.get(n-1);
             }
         }

         // Don't flash while we are in a call or screen is on
         ///M: we need flash when screen is on
         //mScreenOn add by lvmingfei for don't flash while screen is on in 2013-09-20
         if (mLedNotification == null || mInCall || mCallRinging)) {
             mNotificationLight.turnOff();
         } else {
             int ledARGB = mLedNotification.notification.ledARGB;
             int ledOnMS = mLedNotification.notification.ledOnMS;
             int ledOffMS = mLedNotification.notification.ledOffMS;
             if ((mLedNotification.notification.defaults & Notification.DEFAULT_LIGHTS) != 0) {
                 ledARGB = mDefaultNotificationColor;
                 ledOnMS = mDefaultNotificationLedOn;
                 ledOffMS = mDefaultNotificationLedOff;
             }
             if (mNotificationPulseEnabled) {
                 // pulse repeatedly
                 ///M: log lights information
                 Log.d(TAG, "notification setFlashing ledOnMS = "+ledOnMS + " ledOffMS = "+ ledOffMS + "， ledARGB ：" + ledARGB);
                 mNotificationLight.setFlashing(ledARGB, LightsService.LIGHT_FLASH_TIMED,
                         ledOnMS, ledOffMS);
                 ///M:
             } else {
                 // pulse only once
                 mNotificationLight.pulse(ledARGB, ledOnMS);
             }
         }
     }

这段代码中有如下操作，判断一些变量的状态，以决定时候关闭指示灯，还是闪光，还是只闪一次的操作；
电话的状态是否是offhook，或来电的状态，会操作：

 <span style="font-size:18px;">mNotificationLight.turnOff();</span>

下面这个条件也很重要：

 <span style="font-size:18px;">if ((mLedNotification.notification.defaults & Notification.DEFAULT_LIGHTS) != 0) {</span>

未解来电，或短信的时候这个值会设置为

 <span style="font-size:18px;">notification.defaults |= Notification.DEFAULT_LIGHTS;</span>

这个值是4，那么上面的这个判断就为true了，所以灯的颜色就不是由

 <span style="font-size:18px;">mLedNotification.notification.ledARGB;</span>

这个值决定的了，而是由mDefaultNotificationColor这个值决定的，这个值的定义在

 <span style="font-size:18px;">mDefaultNotificationColor = resources.getColor(
                 com.android.internal.R.color.config_defaultNotificationColor);</span>

这个值的定义在framework/base/core/res/res/values/config.xml中定义的，

 <span style="font-size:18px;"><color name="config_defaultNotificationColor">#ff0000ff</color></span>

这个表示是蓝灯；具体想改成其他值；

1. #ff0000ff 表示蓝灯
   
2. #ff00ff00 表示绿灯
   
3. #ffff0000 表示红灯

后面的逻辑就调用到LightsService.java中去了，这个类是管理灯的类，（背光灯，按键灯，指示灯等等）；

     拓展：

             如果想实现屏幕亮的时候，指示灯灭，屏幕灭的时候指示灯亮；可以监听ACTION_SCREEN_ON/ACTION_SCREEN_OFF的广播，搞一个全局的变量控制下；再调用updateNotificationPulse（）这个方法，把变量的判断加载updateNotificationPulse（）这个方法的灯亮灭判断的地方即可；

        其次，我们来看看返回键的灯，即按键灯；

        Step 1 ：先来看看PowerManagerService.java这个类。按键灯的定义

 <span style="font-size:18px;"> private LightsService.Light mButtonLight;</span>

        初始化方法：

 <span style="font-size:18px;">mButtonLight = mLightsService.getLight(LightsService.LIGHT_ID_BUTTONS);</span>

 <span style="font-size:18px;"> if ( (newScreenState == DisplayPowerRequest.SCREEN_STATE_BRIGHT) && (mWakefulness == WAKEFULNESS_AWAKE) && !mIPOShutdown && !mShutdownFlag) {
                 if ( ( (mWakeLockSummary & WAKE_LOCK_BUTTON_BRIGHT) != 0 ) ||
                         ( (mUserActivitySummary & USER_ACTIVITY_BUTTON_BRIGHT) != 0) ) {
                     mButtonLight.setBrightness(mScreenBrightness);
                     Slog.i(TAG, "setBrightness mButtonLight, mScreenBrightness=" + mScreenBrightness);
                 } else {
                     mButtonLight.turnOff();
                     Slog.i(TAG, "setBrightness mButtonLight 0 ===.");
                 }
             } else {
                 mButtonLight.turnOff();
                 Slog.i(TAG, "setBrightness mButtonLight else 0.");
             }</span>

灯的点亮的方法setBrightness（）

灯关闭的方法turnOff（）

要想修改按键灯随p-sensor的灯的亮灭同步，可以参考Android4.2中Phone的P-sensor的应用的分析。

然后再加上上述控制灯亮灭的方法就可实现同步；

     总结：灯的亮灭最后都会调用到LightsService.java这个类的，最后通过c代码调用底层的接口实现灯的颜色和闪烁的变化的；

最终通过JNI调用vendor\mediatek\proprietary\hardware\liblights\lights.c

另外三色灯底层是写死的只能三色，要是自定义请修改lights.c

/* Copyright Statement:
 *
 * This software/firmware and related documentation ("MediaTek Software") are
 * protected under relevant copyright laws. The information contained herein is
 * confidential and proprietary to MediaTek Inc. and/or its licensors. Without
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 *
 * The following software/firmware and/or related documentation ("MediaTek
 * Software") have been modified by MediaTek Inc. All revisions are subject to
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/*
 * Copyright (C) 2008 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */


#define LOG_TAG "lights"


#include <cutils/log.h>

#include <stdint.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>
#include <fcntl.h>
#include <pthread.h>
#include <time.h>

#include <sys/ioctl.h>
#include <sys/types.h>

#include <hardware/lights.h>

#define LIGHTS_DBG_ON
/******************************************************************************/

static pthread_once_t g_init = PTHREAD_ONCE_INIT;
static pthread_mutex_t g_lock = PTHREAD_MUTEX_INITIALIZER;
static int g_haveTrackballLight = 0;
static struct light_state_t g_notification;
static struct light_state_t g_battery;
static int g_backlight = 255;
static int g_trackball = -1;
static int g_buttons = 0;
static int g_attention = 0;

/* TRACKBALL BACKLIGHT */
char const*const TRACKBALL_FILE
        = "/sys/class/leds/jogball-backlight/brightness";

/* RED LED */
char const*const RED_LED_FILE
        = "/sys/class/leds/red/brightness";

char const*const RED_TRIGGER_FILE
        = "/sys/class/leds/red/trigger";

char const*const RED_DELAY_ON_FILE
        = "/sys/class/leds/red/delay_on";

char const*const RED_DELAY_OFF_FILE
        = "/sys/class/leds/red/delay_off";

/* GREEN LED */
char const*const GREEN_LED_FILE
        = "/sys/class/leds/green/brightness";

char const*const GREEN_TRIGGER_FILE
        = "/sys/class/leds/green/trigger";

char const*const GREEN_DELAY_ON_FILE
        = "/sys/class/leds/green/delay_on";

char const*const GREEN_DELAY_OFF_FILE
        = "/sys/class/leds/green/delay_off";

/* BLUE LED */
char const*const BLUE_LED_FILE
        = "/sys/class/leds/blue/brightness";

char const*const BLUE_TRIGGER_FILE
        = "/sys/class/leds/blue/trigger";

char const*const BLUE_DELAY_ON_FILE
        = "/sys/class/leds/blue/delay_on";

char const*const BLUE_DELAY_OFF_FILE
        = "/sys/class/leds/blue/delay_off";

/* LCD BACKLIGHT */
char const*const LCD_FILE
        = "/sys/class/leds/lcd-backlight/brightness";

/* KEYBOARD BACKLIGHT */
char const*const KEYBOARD_FILE
        = "/sys/class/leds/keyboard-backlight/brightness";

/* BUTTON BACKLIGHT */
char const*const BUTTON_FILE
        = "/sys/class/leds/button-backlight/brightness";

//ALPS0804285 add for delay
int led_wait_delay(int ms) 
{
	struct timespec req = {.tv_sec = 0, .tv_nsec = ms*1000000};
	struct timespec rem;
	int ret = nanosleep(&req, &rem);

	while(ret)
	{
		if(errno == EINTR)
		{
			req.tv_sec  = rem.tv_sec;
			req.tv_nsec = rem.tv_nsec;
			ret = nanosleep(&req, &rem);
		}
		else
		{
			perror("nanosleep");
			return errno;
		}
	}
	return 0;
}

/**
 * device methods
 */

void init_globals(void)
{
    // init the mutex
    pthread_mutex_init(&g_lock, NULL);

    // figure out if we have the trackball LED or not
    g_haveTrackballLight = (access(TRACKBALL_FILE, W_OK) == 0) ? 1 : 0;

}

static int
write_int(char const* path, int value)
{
    int fd;

#ifdef LIGHTS_INFO_ON
	ALOGD("write %d to %s", value, path);
#endif

    fd = open(path, O_RDWR);
	ALOGD("write_int open fd=%d\n", fd);
    if (fd >= 0) {
        char buffer[20];
        int bytes = sprintf(buffer, "%d\n", value);
        int amt = write(fd, buffer, bytes);
        close(fd);
        return amt == -1 ? -errno : 0;
    } else {
        return -errno;
    }
}

static int
write_str(char const* path, char *str)
{
    int fd;

#ifdef LIGHTS_INFO_ON
	ALOGD("write %s to %s", str, path);
#endif

    fd = open(path, O_WRONLY);
    if (fd >= 0) {
        char buffer[20];
        int bytes = sprintf(buffer, "%s", str);
        int amt = write(fd, buffer, bytes);
        close(fd);
        return amt == -1 ? -errno : 0;
    } else {
        return -errno;
    }
}

static int
is_lit(struct light_state_t const* state)
{
    return state->color & 0x00ffffff;
}

static int
blink_red(int level, int onMS, int offMS)
{
	static int preStatus = 0; // 0: off, 1: blink, 2: no blink
	int nowStatus;
	int i = 0;

	if (level == 0)
		nowStatus = 0;
	else if (onMS && offMS)
		nowStatus = 1;
	else
		nowStatus = 2;

	if (preStatus == nowStatus)
		return -1;

#ifdef LIGHTS_DBG_ON
	ALOGD("blink_red, level=%d, onMS=%d, offMS=%d\n", level, onMS, offMS);
#endif
	if (nowStatus == 0) {
        	write_int(RED_LED_FILE, 0);
	}
	else if (nowStatus == 1) {
//        	write_int(RED_LED_FILE, level); // default full brightness
		write_str(RED_TRIGGER_FILE, "timer");
		while (((access(RED_DELAY_OFF_FILE, F_OK) == -1) || (access(RED_DELAY_OFF_FILE, R_OK|W_OK) == -1)) && i<10) {
			ALOGD("RED_DELAY_OFF_FILE doesn't exist or cannot write!!\n");
			led_wait_delay(5);//sleep 5ms for wait kernel LED class create led delay_off/delay_on node of fs
			i++;
		}
		write_int(RED_DELAY_OFF_FILE, offMS);
		write_int(RED_DELAY_ON_FILE, onMS);
	}
	else {
		write_str(RED_TRIGGER_FILE, "none");
        	write_int(RED_LED_FILE, 255); // default full brightness
	}

	preStatus = nowStatus;

	return 0;
}

static int
blink_green(int level, int onMS, int offMS)
{
	static int preStatus = 0; // 0: off, 1: blink, 2: no blink
	int nowStatus;
	int i = 0;

	if (level == 0)
		nowStatus = 0;
	else if (onMS && offMS)
		nowStatus = 1;
	else
		nowStatus = 2;

	if (preStatus == nowStatus)
		return -1;

#ifdef LIGHTS_DBG_ON
	ALOGD("blink_green, level=%d, onMS=%d, offMS=%d\n", level, onMS, offMS);
#endif
	if (nowStatus == 0) {
        	write_int(GREEN_LED_FILE, 0);
	}
	else if (nowStatus == 1) {
//        	write_int(GREEN_LED_FILE, level); // default full brightness
		write_str(GREEN_TRIGGER_FILE, "timer");
		while (((access(GREEN_DELAY_OFF_FILE, F_OK) == -1) || (access(GREEN_DELAY_OFF_FILE, R_OK|W_OK) == -1)) && i<10) {
			ALOGD("GREEN_DELAY_OFF_FILE doesn't exist or cannot write!!\n");
			led_wait_delay(5);//sleep 5ms for wait kernel LED class create led delay_off/delay_on node of fs
			i++;
		}
		write_int(GREEN_DELAY_OFF_FILE, offMS);
		write_int(GREEN_DELAY_ON_FILE, onMS);
	}
	else {
		write_str(GREEN_TRIGGER_FILE, "none");
        	write_int(GREEN_LED_FILE, 255); // default full brightness
	}

	preStatus = nowStatus;

	return 0;
}

static int
blink_blue(int level, int onMS, int offMS)
{
	static int preStatus = 0; // 0: off, 1: blink, 2: no blink
	int nowStatus;
	int i = 0;

	if (level == 0)
		nowStatus = 0;
	else if (onMS && offMS)
		nowStatus = 1;
	else
		nowStatus = 2;

	if (preStatus == nowStatus)
		return -1;

#ifdef LIGHTS_DBG_ON
	ALOGD("blink_blue, level=%d, onMS=%d, offMS=%d\n", level, onMS, offMS);
#endif
	if (nowStatus == 0) {
        	write_int(BLUE_LED_FILE, 0);
	}
	else if (nowStatus == 1) {
//        	write_int(BLUE_LED_FILE, level); // default full brightness
		write_str(BLUE_TRIGGER_FILE, "timer");
		while (((access(BLUE_DELAY_OFF_FILE, F_OK) == -1) || (access(BLUE_DELAY_OFF_FILE, R_OK|W_OK) == -1)) && i<10) {
			ALOGD("BLUE_DELAY_OFF_FILE doesn't exist or cannot write!!\n");
			led_wait_delay(5);//sleep 5ms for wait kernel LED class create led delay_off/delay_on node of fs
			i++;
		}
		write_int(BLUE_DELAY_OFF_FILE, offMS);
		write_int(BLUE_DELAY_ON_FILE, onMS);
	}
	else {
		write_str(BLUE_TRIGGER_FILE, "none");
        	write_int(BLUE_LED_FILE, 255); // default full brightness
	}

	preStatus = nowStatus;

	return 0;
}

static int
handle_trackball_light_locked(struct light_device_t* dev)
{
    int mode = g_attention;

    if (mode == 7 && g_backlight) {
        mode = 0;
    }
    ALOGV("%s g_backlight = %d, mode = %d, g_attention = %d\n",
        __func__, g_backlight, mode, g_attention);

    // If the value isn't changing, don't set it, because this
    // can reset the timer on the breathing mode, which looks bad.
    if (g_trackball == mode) {
        return 0;
    }

    return write_int(TRACKBALL_FILE, mode);
}

static int
rgb_to_brightness(struct light_state_t const* state)
{
    int color = state->color & 0x00ffffff;
    return ((77*((color>>16)&0x00ff))
            + (150*((color>>8)&0x00ff)) + (29*(color&0x00ff))) >> 8;
}

static int
set_light_backlight(struct light_device_t* dev,
        struct light_state_t const* state)
{
    int err = 0;
    int brightness = rgb_to_brightness(state);
    pthread_mutex_lock(&g_lock);
    g_backlight = brightness;
    err = write_int(LCD_FILE, brightness);
    if (g_haveTrackballLight) {
        handle_trackball_light_locked(dev);
    }
    pthread_mutex_unlock(&g_lock);
    return err;
}

static int
set_light_keyboard(struct light_device_t* dev,
        struct light_state_t const* state)
{
    int err = 0;
    int on = is_lit(state);
    pthread_mutex_lock(&g_lock);
    err = write_int(KEYBOARD_FILE, on?255:0);
    pthread_mutex_unlock(&g_lock);
    return err;
}

static int
set_light_buttons(struct light_device_t* dev,
        struct light_state_t const* state)
{
    int err = 0;
    int on = is_lit(state);
    pthread_mutex_lock(&g_lock);
    g_buttons = on;
    err = write_int(BUTTON_FILE, on?255:0);
    pthread_mutex_unlock(&g_lock);
    return err;
}

static int
set_speaker_light_locked(struct light_device_t* dev,
        struct light_state_t const* state)
{
    int len;
    int alpha, red, green, blue;
    int onMS, offMS;
    unsigned int colorRGB;

    switch (state->flashMode) {
        case LIGHT_FLASH_TIMED:
            onMS = state->flashOnMS;
            offMS = state->flashOffMS;
            break;
        case LIGHT_FLASH_NONE:
        default:
            onMS = 0;
            offMS = 0;
            break;
    }

    colorRGB = state->color;

#ifdef LIGHTS_DBG_ON
    ALOGD("set_led_state colorRGB=%08X, onMS=%d, offMS=%d\n",
            colorRGB, onMS, offMS);
#endif

    alpha = (colorRGB >> 24) & 0xFF;
    if (alpha) {
    	red = (colorRGB >> 16) & 0xFF;
    	green = (colorRGB >> 8) & 0xFF;
    	blue = colorRGB & 0xFF;
    } else { // alpha = 0 means turn the LED off
    	red = green = blue = 0;
    }

    if (red) {
        blink_green(0, 0, 0);
        blink_blue(0, 0, 0);
        blink_red(red, onMS, offMS);
    }
    else if (green) {
        blink_red(0, 0, 0);
        blink_blue(0, 0, 0);
        blink_green(green, onMS, offMS);
    }
    else if (blue) {
        blink_red(0, 0, 0);
        blink_green(0, 0, 0);
        blink_blue(blue, onMS, offMS);
    }
    else {
        blink_red(0, 0, 0);
        blink_green(0, 0, 0);
        blink_blue(0, 0, 0);
    }

    return 0;
}

static void
handle_speaker_battery_locked(struct light_device_t* dev)
{
    if (is_lit(&g_battery)) {
        set_speaker_light_locked(dev, &g_battery);
    } else {
    	set_speaker_light_locked(dev, &g_battery); /*Turkey workaround: notification and Low battery case, IPO bootup, NLED cannot blink*/
        set_speaker_light_locked(dev, &g_notification);
    }
}

static int
set_light_battery(struct light_device_t* dev,
        struct light_state_t const* state)
{
    pthread_mutex_lock(&g_lock);
    g_battery = *state;
    if (g_haveTrackballLight) {
        set_speaker_light_locked(dev, state);
    }
    handle_speaker_battery_locked(dev);
    pthread_mutex_unlock(&g_lock);
    return 0;
}

static int
set_light_notifications(struct light_device_t* dev,
        struct light_state_t const* state)
{
    pthread_mutex_lock(&g_lock);
    g_notification = *state;
    ALOGV("set_light_notifications g_trackball=%d color=0x%08x",
            g_trackball, state->color);
    if (g_haveTrackballLight) {
        handle_trackball_light_locked(dev);
    }
    handle_speaker_battery_locked(dev);
    pthread_mutex_unlock(&g_lock);
    return 0;
}

static int
set_light_attention(struct light_device_t* dev,
        struct light_state_t const* state)
{
    pthread_mutex_lock(&g_lock);
    ALOGV("set_light_attention g_trackball=%d color=0x%08x",
            g_trackball, state->color);
    if (state->flashMode == LIGHT_FLASH_HARDWARE) {
        g_attention = state->flashOnMS;
    } else if (state->flashMode == LIGHT_FLASH_NONE) {
        g_attention = 0;
    }
    if (g_haveTrackballLight) {
        handle_trackball_light_locked(dev);
    }
    pthread_mutex_unlock(&g_lock);
    return 0;
}


/** Close the lights device */
static int
close_lights(struct light_device_t *dev)
{
    if (dev) {
        free(dev);
    }
    return 0;
}


/******************************************************************************/

/**
 * module methods
 */

/** Open a new instance of a lights device using name */
static int open_lights(const struct hw_module_t* module, char const* name,
        struct hw_device_t** device)
{
    int (*set_light)(struct light_device_t* dev,
            struct light_state_t const* state);

    if (0 == strcmp(LIGHT_ID_BACKLIGHT, name)) {
        set_light = set_light_backlight;
    }
    else if (0 == strcmp(LIGHT_ID_KEYBOARD, name)) {
        set_light = set_light_keyboard;
    }
    else if (0 == strcmp(LIGHT_ID_BUTTONS, name)) {
        set_light = set_light_buttons;
    }
    else if (0 == strcmp(LIGHT_ID_BATTERY, name)) {
        set_light = set_light_battery;
    }
    else if (0 == strcmp(LIGHT_ID_NOTIFICATIONS, name)) {
        set_light = set_light_notifications;
    }
    else if (0 == strcmp(LIGHT_ID_ATTENTION, name)) {
        set_light = set_light_attention;
    }
    else {
        return -EINVAL;
    }

    pthread_once(&g_init, init_globals);

    struct light_device_t *dev = malloc(sizeof(struct light_device_t));
    memset(dev, 0, sizeof(*dev));

    dev->common.tag = HARDWARE_DEVICE_TAG;
    dev->common.version = 0;
    dev->common.module = (struct hw_module_t*)module;
    dev->common.close = (int (*)(struct hw_device_t*))close_lights;
    dev->set_light = set_light;

    *device = (struct hw_device_t*)dev;
    return 0;
}


static struct hw_module_methods_t lights_module_methods = {
    .open =  open_lights,
};

/*
 * The lights Module
 */
struct hw_module_t HAL_MODULE_INFO_SYM = {
    .tag = HARDWARE_MODULE_TAG,
    //.version_major = 1,
    //.version_minor = 0,
    .id = LIGHTS_HARDWARE_MODULE_ID,
    .name = "MTK lights Module",
    .author = "MediaTek",
    .methods = &lights_module_methods,
};