|--frameworks/base/services/java/com/android/server/power/PowerManagerService.java
public void systemReady(TwilightService twilight, DreamManagerService dreamManager) {
synchronized (mLock) {
mSystemReady = true;
mDreamManager = dreamManager;
PowerManager pm = (PowerManager)mContext.getSystemService(Context.POWER_SERVICE);
mScreenBrightnessSettingMinimum = pm.getMinimumScreenBrightnessSetting();
mScreenBrightnessSettingMaximum = pm.getMaximumScreenBrightnessSetting();
mScreenBrightnessSettingDefault = pm.getDefaultScreenBrightnessSetting();
SensorManager sensorManager = new SystemSensorManager(mContext, mHandler.getLooper());
// The notifier runs on the system server's main looper so as not to interfere
// with the animations and other critical functions of the power manager.
mNotifier = new Notifier(Looper.getMainLooper(), mContext, mBatteryStats,
mAppOps, createSuspendBlockerLocked("PowerManagerService.Broadcasts"),
mScreenOnBlocker, mPolicy);
// The display power controller runs on the power manager service's
// own handler thread to ensure timely operation.
mDisplayPowerController = new DisplayPowerController(mHandler.getLooper(),
mContext, mNotifier, mLightsService, twilight, sensorManager,
mDisplayManagerService, mDisplaySuspendBlocker, mDisplayBlanker,
mDisplayPowerControllerCallbacks, mHandler);
mWirelessChargerDetector = new WirelessChargerDetector(sensorManager,
createSuspendBlockerLocked("PowerManagerService.WirelessChargerDetector"),
mHandler);
mSettingsObserver = new SettingsObserver(mHandler);
mAttentionLight = mLightsService.getLight(LightsService.LIGHT_ID_ATTENTION);
// Register for broadcasts from other components of the system.
IntentFilter filter = new IntentFilter();
filter.addAction(Intent.ACTION_BATTERY_CHANGED);
mContext.registerReceiver(new BatteryReceiver(), filter, null, mHandler);
filter = new IntentFilter();
filter.addAction(Intent.ACTION_BOOT_COMPLETED);
mContext.registerReceiver(new BootCompletedReceiver(), filter, null, mHandler);
filter = new IntentFilter();
filter.addAction(Intent.ACTION_DREAMING_STARTED);
filter.addAction(Intent.ACTION_DREAMING_STOPPED);
mContext.registerReceiver(new DreamReceiver(), filter, null, mHandler);
filter = new IntentFilter();
filter.addAction(Intent.ACTION_USER_SWITCHED);
mContext.registerReceiver(new UserSwitchedReceiver(), filter, null, mHandler);
filter = new IntentFilter();
filter.addAction(Intent.ACTION_DOCK_EVENT);
mContext.registerReceiver(new DockReceiver(), filter, null, mHandler);
// Register for settings changes.
final ContentResolver resolver = mContext.getContentResolver();
resolver.registerContentObserver(Settings.Secure.getUriFor(
Settings.Secure.SCREENSAVER_ENABLED),
false, mSettingsObserver, UserHandle.USER_ALL);
resolver.registerContentObserver(Settings.Secure.getUriFor(
Settings.Secure.SCREENSAVER_ACTIVATE_ON_SLEEP),
false, mSettingsObserver, UserHandle.USER_ALL);
resolver.registerContentObserver(Settings.Secure.getUriFor(
Settings.Secure.SCREENSAVER_ACTIVATE_ON_DOCK),
false, mSettingsObserver, UserHandle.USER_ALL);
resolver.registerContentObserver(Settings.System.getUriFor(
Settings.System.SCREEN_OFF_TIMEOUT),
false, mSettingsObserver, UserHandle.USER_ALL);
resolver.registerContentObserver(Settings.Global.getUriFor(
Settings.Global.STAY_ON_WHILE_PLUGGED_IN),
false, mSettingsObserver, UserHandle.USER_ALL);
resolver.registerContentObserver(Settings.System.getUriFor(
Settings.System.SCREEN_BRIGHTNESS),//监听亮度变化
false, mSettingsObserver, UserHandle.USER_ALL);
resolver.registerContentObserver(Settings.System.getUriFor(
Settings.System.SCREEN_BRIGHTNESS_MODE),
false, mSettingsObserver, UserHandle.USER_ALL);
// Go.
readConfigurationLocked();
updateSettingsLocked();
mDirty |= DIRTY_BATTERY_STATE;
updatePowerStateLocked();
}
} private void handleSettingsChangedLocked() {
updateSettingsLocked();
updatePowerStateLocked();
} private void updateSettingsLocked() {
final ContentResolver resolver = mContext.getContentResolver();
mDreamsEnabledSetting = (Settings.Secure.getIntForUser(resolver,
Settings.Secure.SCREENSAVER_ENABLED,
mDreamsEnabledByDefaultConfig ? 1 : 0,
UserHandle.USER_CURRENT) != 0);
mDreamsActivateOnSleepSetting = (Settings.Secure.getIntForUser(resolver,
Settings.Secure.SCREENSAVER_ACTIVATE_ON_SLEEP,
mDreamsActivatedOnSleepByDefaultConfig ? 1 : 0,
UserHandle.USER_CURRENT) != 0);
mDreamsActivateOnDockSetting = (Settings.Secure.getIntForUser(resolver,
Settings.Secure.SCREENSAVER_ACTIVATE_ON_DOCK,
mDreamsActivatedOnDockByDefaultConfig ? 1 : 0,
UserHandle.USER_CURRENT) != 0);
mScreenOffTimeoutSetting = Settings.System.getIntForUser(resolver,
Settings.System.SCREEN_OFF_TIMEOUT, DEFAULT_SCREEN_OFF_TIMEOUT,
UserHandle.USER_CURRENT);
mStayOnWhilePluggedInSetting = Settings.Global.getInt(resolver,
Settings.Global.STAY_ON_WHILE_PLUGGED_IN, BatteryManager.BATTERY_PLUGGED_AC);
final int oldScreenBrightnessSetting = mScreenBrightnessSetting;
mScreenBrightnessSetting = Settings.System.getIntForUser(resolver,
Settings.System.SCREEN_BRIGHTNESS, mScreenBrightnessSettingDefault,
UserHandle.USER_CURRENT);//更新亮度值
if (oldScreenBrightnessSetting != mScreenBrightnessSetting) {
mTemporaryScreenBrightnessSettingOverride = -1;
}
final float oldScreenAutoBrightnessAdjustmentSetting =
mScreenAutoBrightnessAdjustmentSetting;
mScreenAutoBrightnessAdjustmentSetting = Settings.System.getFloatForUser(resolver,
Settings.System.SCREEN_AUTO_BRIGHTNESS_ADJ, 0.0f,
UserHandle.USER_CURRENT);
if (oldScreenAutoBrightnessAdjustmentSetting != mScreenAutoBrightnessAdjustmentSetting) {
mTemporaryScreenAutoBrightnessAdjustmentSettingOverride = Float.NaN;
}
mScreenBrightnessModeSetting = Settings.System.getIntForUser(resolver,
Settings.System.SCREEN_BRIGHTNESS_MODE,
Settings.System.SCREEN_BRIGHTNESS_MODE_MANUAL, UserHandle.USER_CURRENT);
mDirty |= DIRTY_SETTINGS;
} /**
* Updates the global power state based on dirty bits recorded in mDirty.
*
* This is the main function that performs power state transitions.
* We centralize them here so that we can recompute the power state completely
* each time something important changes, and ensure that we do it the same
* way each time. The point is to gather all of the transition logic here.
*/
private void updatePowerStateLocked() {
if (!mSystemReady || mDirty == 0) {
return;
}
// Phase 0: Basic state updates.
updateIsPoweredLocked(mDirty);
updateStayOnLocked(mDirty);
// Phase 1: Update wakefulness.
// Loop because the wake lock and user activity computations are influenced
// by changes in wakefulness.
final long now = SystemClock.uptimeMillis();
int dirtyPhase2 = 0;
for (;;) {
int dirtyPhase1 = mDirty;
dirtyPhase2 |= dirtyPhase1;
mDirty = 0;
updateWakeLockSummaryLocked(dirtyPhase1);
updateUserActivitySummaryLocked(now, dirtyPhase1);
if (!updateWakefulnessLocked(dirtyPhase1)) {
break;
}
}
// Phase 2: Update dreams and display power state.
updateDreamLocked(dirtyPhase2);
updateDisplayPowerStateLocked(dirtyPhase2);//下一步
// Phase 3: Send notifications, if needed.
if (mDisplayReady) {
sendPendingNotificationsLocked();
}
// Phase 4: Update suspend blocker.
// Because we might release the last suspend blocker here, we need to make sure
// we finished everything else first!
updateSuspendBlockerLocked();
//updateBootFastSuspendBlockerLocked();
} /**
* Updates the display power state asynchronously.
* When the update is finished, mDisplayReady will be set to true. The display
* controller posts a message to tell us when the actual display power state
* has been updated so we come back here to double-check and finish up.
*
* This function recalculates the display power state each time.
*/
private void updateDisplayPowerStateLocked(int dirty) {
if ((dirty & (DIRTY_WAKE_LOCKS | DIRTY_USER_ACTIVITY | DIRTY_WAKEFULNESS
| DIRTY_ACTUAL_DISPLAY_POWER_STATE_UPDATED | DIRTY_BOOT_COMPLETED
| DIRTY_SETTINGS | DIRTY_SCREEN_ON_BLOCKER_RELEASED)) != 0) {
int newScreenState = getDesiredScreenPowerStateLocked();
if (newScreenState != mDisplayPowerRequest.screenState) {
if (newScreenState == DisplayPowerRequest.SCREEN_STATE_OFF
&& mDisplayPowerRequest.screenState
!= DisplayPowerRequest.SCREEN_STATE_OFF) {
mLastScreenOffEventElapsedRealTime = SystemClock.elapsedRealtime();
}
mDisplayPowerRequest.screenState = newScreenState;
nativeSetPowerState(
newScreenState != DisplayPowerRequest.SCREEN_STATE_OFF,
newScreenState == DisplayPowerRequest.SCREEN_STATE_BRIGHT);
}
int screenBrightness = mScreenBrightnessSettingDefault;
float screenAutoBrightnessAdjustment = 0.0f;
boolean autoBrightness = (mScreenBrightnessModeSetting ==
Settings.System.SCREEN_BRIGHTNESS_MODE_AUTOMATIC);
if (isValidBrightness(mScreenBrightnessOverrideFromWindowManager)) {
screenBrightness = mScreenBrightnessOverrideFromWindowManager;
autoBrightness = false;
} else if (isValidBrightness(mTemporaryScreenBrightnessSettingOverride)) {
screenBrightness = mTemporaryScreenBrightnessSettingOverride;
} else if (isValidBrightness(mScreenBrightnessSetting)) {
screenBrightness = mScreenBrightnessSetting;
}
if (autoBrightness) {
screenBrightness = mScreenBrightnessSettingDefault;
if (isValidAutoBrightnessAdjustment(
mTemporaryScreenAutoBrightnessAdjustmentSettingOverride)) {
screenAutoBrightnessAdjustment =
mTemporaryScreenAutoBrightnessAdjustmentSettingOverride;
} else if (isValidAutoBrightnessAdjustment(
mScreenAutoBrightnessAdjustmentSetting)) {
screenAutoBrightnessAdjustment = mScreenAutoBrightnessAdjustmentSetting;
}
}
screenBrightness = Math.max(Math.min(screenBrightness,
mScreenBrightnessSettingMaximum), mScreenBrightnessSettingMinimum);
screenAutoBrightnessAdjustment = Math.max(Math.min(
screenAutoBrightnessAdjustment, 1.0f), -1.0f);
mDisplayPowerRequest.screenBrightness = screenBrightness;
mDisplayPowerRequest.screenAutoBrightnessAdjustment =
screenAutoBrightnessAdjustment;
mDisplayPowerRequest.useAutoBrightness = autoBrightness;
mDisplayPowerRequest.useProximitySensor = shouldUseProximitySensorLocked();
mDisplayPowerRequest.blockScreenOn = mScreenOnBlocker.isHeld();
mDisplayReady = mDisplayPowerController.requestPowerState(mDisplayPowerRequest,
mRequestWaitForNegativeProximity);//下一步
mRequestWaitForNegativeProximity = false;
if (DEBUG_SPEW) {
Slog.d(TAG, "updateScreenStateLocked: mDisplayReady=" + mDisplayReady
+ ", newScreenState=" + newScreenState
+ ", mWakefulness=" + mWakefulness
+ ", mWakeLockSummary=0x" + Integer.toHexString(mWakeLockSummary)
+ ", mUserActivitySummary=0x" + Integer.toHexString(mUserActivitySummary)
+ ", mBootCompleted=" + mBootCompleted);
}
}
}|--frameworks/base/services/java/com/android/server/power/DisplayPowerController.java
/**
* Requests a new power state.
* The controller makes a copy of the provided object and then
* begins adjusting the power state to match what was requested.
*
* @param request The requested power state.
* @param waitForNegativeProximity If true, issues a request to wait for
* negative proximity before turning the screen back on, assuming the screen
* was turned off by the proximity sensor.
* @return True if display is ready, false if there are important changes that must
* be made asynchronously (such as turning the screen on), in which case the caller
* should grab a wake lock, watch for {@link Callbacks#onStateChanged()} then try
* the request again later until the state converges.
*/
public boolean requestPowerState(DisplayPowerRequest request,
boolean waitForNegativeProximity) {
if (mPendingRequestLocked == null) {
mPendingRequestLocked = new DisplayPowerRequest(request);
changed = true;
} else if (!mPendingRequestLocked.equals(request)) {
mPendingRequestLocked.copyFrom(request);
changed = true;
}
if (changed) {
mDisplayReadyLocked = false;
}
if (changed && !mPendingRequestChangedLocked) {
mPendingRequestChangedLocked = true;
sendUpdatePowerStateLocked();//下一步
} private void sendUpdatePowerState() {
synchronized (mLock) {
sendUpdatePowerStateLocked();
}
}
private void sendUpdatePowerStateLocked() {
if (!mPendingUpdatePowerStateLocked) {
mPendingUpdatePowerStateLocked = true;
Message msg = mHandler.obtainMessage(MSG_UPDATE_POWER_STATE);
msg.setAsynchronous(true);
mHandler.sendMessage(msg);
}
}
...
@Override
public void handleMessage(Message msg) {
switch (msg.what) {
case MSG_UPDATE_POWER_STATE:
updatePowerState();//下一步
break;
... private void updatePowerState() {
// Update the power state request.
final boolean mustNotify;
boolean mustInitialize = false;
boolean updateAutoBrightness = mTwilightChanged;
boolean wasDim = false;
mTwilightChanged = false;
synchronized (mLock) {
mPendingUpdatePowerStateLocked = false;
if (mPendingRequestLocked == null) {
return; // wait until first actual power request
}
if (mPowerRequest == null) {
mPowerRequest = new DisplayPowerRequest(mPendingRequestLocked);
mWaitingForNegativeProximity = mPendingWaitForNegativeProximityLocked;
mPendingWaitForNegativeProximityLocked = false;
mPendingRequestChangedLocked = false;
mustInitialize = true;
} else if (mPendingRequestChangedLocked) {
if (mPowerRequest.screenAutoBrightnessAdjustment
!= mPendingRequestLocked.screenAutoBrightnessAdjustment) {
updateAutoBrightness = true;
}
wasDim = (mPowerRequest.screenState == DisplayPowerRequest.SCREEN_STATE_DIM);
mPowerRequest.copyFrom(mPendingRequestLocked);
mWaitingForNegativeProximity |= mPendingWaitForNegativeProximityLocked;
mPendingWaitForNegativeProximityLocked = false;
mPendingRequestChangedLocked = false;
mDisplayReadyLocked = false;
}
mustNotify = !mDisplayReadyLocked;
}
// Initialize things the first time the power state is changed.
if (mustInitialize) {
initialize();
}
// Apply the proximity sensor.
if (mProximitySensor != null) {
if (mPowerRequest.useProximitySensor
&& mPowerRequest.screenState != DisplayPowerRequest.SCREEN_STATE_OFF) {
setProximitySensorEnabled(true);
if (!mScreenOffBecauseOfProximity
&& mProximity == PROXIMITY_POSITIVE) {
mScreenOffBecauseOfProximity = true;
sendOnProximityPositiveWithWakelock();
setScreenOn(false);
}
} else if (mWaitingForNegativeProximity
&& mScreenOffBecauseOfProximity
&& mProximity == PROXIMITY_POSITIVE
&& mPowerRequest.screenState != DisplayPowerRequest.SCREEN_STATE_OFF) {
setProximitySensorEnabled(true);
} else {
setProximitySensorEnabled(false);
mWaitingForNegativeProximity = false;
}
if (mScreenOffBecauseOfProximity
&& mProximity != PROXIMITY_POSITIVE) {
mScreenOffBecauseOfProximity = false;
sendOnProximityNegativeWithWakelock();
}
} else {
mWaitingForNegativeProximity = false;
}
// Turn on the light sensor if needed.
if (mLightSensor != null) {
setLightSensorEnabled(mPowerRequest.useAutoBrightness
&& wantScreenOn(mPowerRequest.screenState), updateAutoBrightness);
}
// Set the screen brightness.
if (wantScreenOn(mPowerRequest.screenState)) {
int target;
boolean slow;
if (mScreenAutoBrightness >= 0 && mLightSensorEnabled) {
// Use current auto-brightness value.
target = mScreenAutoBrightness;
slow = mUsingScreenAutoBrightness;
mUsingScreenAutoBrightness = true;
} else {
// Light sensor is disabled or not ready yet.
// Use the current brightness setting from the request, which is expected
// provide a nominal default value for the case where auto-brightness
// is not ready yet.
target = mPowerRequest.screenBrightness;
slow = false;
mUsingScreenAutoBrightness = false;
}
if (mPowerRequest.screenState == DisplayPowerRequest.SCREEN_STATE_DIM) {
// Dim quickly by at least some minimum amount.
target = Math.min(target - SCREEN_DIM_MINIMUM_REDUCTION,
mScreenBrightnessDimConfig);
slow = false;
} else if (wasDim) {
// Brighten quickly.
slow = false;
}
animateScreenBrightness(clampScreenBrightness(target),
slow ? BRIGHTNESS_RAMP_RATE_SLOW : BRIGHTNESS_RAMP_RATE_FAST);
...
} private void animateScreenBrightness(int target, int rate) {
if (mScreenBrightnessRampAnimator.animateTo(target, rate)) {//mScreenBrightnessRampAnimator = new RampAnimator<DisplayPowerState>(mPowerState, DisplayPowerState.SCREEN_BRIGHTNESS);
mNotifier.onScreenBrightness(target);
}
} public static final IntProperty<DisplayPowerState> SCREEN_BRIGHTNESS =
new IntProperty<DisplayPowerState>("screenBrightness") {
@Override
public void setValue(DisplayPowerState object, int value) {
object.setScreenBrightness(value);//下一步
}
@Override
public Integer get(DisplayPowerState object) {
return object.getScreenBrightness();
}
}; /**
* Sets the display brightness.
*
* @param brightness The brightness, ranges from 0 (minimum / off) to 255 (brightest).
*/
public void setScreenBrightness(int brightness) {
if (mScreenBrightness != brightness) {
if (DEBUG) {
Slog.d(TAG, "setScreenBrightness: brightness=" + brightness);
}
mScreenBrightness = brightness;
if (mScreenOn) {
mScreenReady = false;
scheduleScreenUpdate();
}
}
}
private void scheduleScreenUpdate() {
if (!mScreenUpdatePending) {
mScreenUpdatePending = true;
postScreenUpdateThreadSafe();
}
}
private void postScreenUpdateThreadSafe() {
mHandler.removeCallbacks(mScreenUpdateRunnable);
mHandler.post(mScreenUpdateRunnable);
}
private final Runnable mScreenUpdateRunnable = new Runnable() {
@Override
public void run() {
mScreenUpdatePending = false;
int brightness = mScreenOn && mElectronBeamLevel > 0f ? mScreenBrightness : 0;
if (mPhotonicModulator.setState(mScreenOn, brightness)) {
mScreenReady = true;
invokeCleanListenerIfNeeded();
}
}
};|-- frameworks/base/services/java/com/android/server/power/DisplayPowerState.java
private final LightsService.Light mBacklight; private final Runnable mTask = new Runnable() {
@Override
public void run() {
// Apply pending changes until done.
for (;;) {
final boolean on;
final boolean onChanged;
final int backlight;
final boolean backlightChanged;
synchronized (mLock) {
on = mPendingOn;
onChanged = (on != mActualOn);
backlight = mPendingBacklight;
backlightChanged = (backlight != mActualBacklight);
if (!onChanged && !backlightChanged) {
mChangeInProgress = false;
break;
}
mActualOn = on;
mActualBacklight = backlight;
}
if (DEBUG) {
Slog.d(TAG, "Updating screen state: on=" + on
+ ", backlight=" + backlight);
}
if (onChanged && on) {
mDisplayBlanker.unblankAllDisplays();
}
if (backlightChanged) {
mBacklight.setBrightness(backlight);//关键代码|--frameworks/base/services/java/com/android/server/LightsService.java
public final class Light {
private Light(int id) {
mId = id;
}
public void setBrightness(int brightness) {
setBrightness(brightness, BRIGHTNESS_MODE_USER);
}
public void setBrightness(int brightness, int brightnessMode) {
synchronized (this) {
int color = brightness & 0x000000ff;
color = 0xff000000 | (color << 16) | (color << 8) | color;
setLightLocked(color, LIGHT_FLASH_NONE, 0, 0, brightnessMode);//继续
}
} private void setLightLocked(int color, int mode, int onMS, int offMS, int brightnessMode) {
if (color != mColor || mode != mMode || onMS != mOnMS || offMS != mOffMS) {
if (DEBUG) Slog.v(TAG, "setLight #" + mId + ": color=#"
+ Integer.toHexString(color));
mColor = color;
mMode = mode;
mOnMS = onMS;
mOffMS = offMS;
setLight_native(mNativePointer, mId, color, mode, onMS, offMS, brightnessMode);//JNI
}
}|--frameworks/base/services/jni/com_android_server_LightsService.cpp
static void setLight_native(JNIEnv *env, jobject clazz, int ptr,
int light, int colorARGB, int flashMode, int onMS, int offMS, int brightnessMode)
{
Devices* devices = (Devices*)ptr;
light_state_t state;
if (light < 0 || light >= LIGHT_COUNT || devices->lights[light] == NULL) {
return ;
}
memset(&state, 0, sizeof(light_state_t));
state.color = colorARGB;
state.flashMode = flashMode;
state.flashOnMS = onMS;
state.flashOffMS = offMS;
state.brightnessMode = brightnessMode;
{
ALOGD_IF_SLOW(50, "Excessive delay setting light");
devices->lights[light]->set_light(devices->lights[light], &state);//light->set_light
}
}static jint init_native(JNIEnv *env, jobject clazz)
{
int err;
hw_module_t* module;
Devices* devices;
devices = (Devices*)malloc(sizeof(Devices));
err = hw_get_module(LIGHTS_HARDWARE_MODULE_ID, (hw_module_t const**)&module);//获取HAL
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 (jint)devices;
}/*
* Copyright (C) 2012 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"
#define LOGE ALOGE
#include <cutils/log.h>
#include <stdint.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <hardware/lights.h>
#include <hardware/hardware.h>
#include <drv_display.h>
static pthread_mutex_t g_lock = PTHREAD_MUTEX_INITIALIZER;
int fd =0;
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)
{
struct light_context_t *ctx;
int brightness = rgb_to_brightness(state);
int i = 0;
unsigned long args[3];
int err = 0;
pthread_mutex_lock(&g_lock);
for(i = 0; i < 3; i++)
{
args[0] = i;
if(ioctl(fd,DISP_CMD_GET_OUTPUT_TYPE,args) == DISP_OUTPUT_TYPE_LCD)
{
args[1] = brightness;
args[2] = 0;
err = ioctl(fd,DISP_CMD_LCD_SET_BRIGHTNESS,args);
break;
}
}
pthread_mutex_unlock(&g_lock);
return err;
}
/** Close the lights device */
static int close_lights(struct light_device_t *dev)
{
if(fd != 0)
{
close(fd);
}
if (dev)
free(dev);
return 0;
}
/** 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)
{
pthread_t lighting_poll_thread;
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;
fd = open("/dev/disp", O_RDONLY);
}
else
return -EINVAL;
pthread_mutex_init(&g_lock, NULL);
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_methods =
{
.open = open_lights,
};
/*
* The backlight 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 = "SoftWinner lights Module",
.author = "SOFTWINNER",
.methods = &lights_methods,
};