android 10 系统源码 充电指示灯设置流程

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frameworks/base/services/core/java/com/android/server/BatteryService.java
		/**
         * Synchronize on BatteryService.
         */
        public void updateLightsLocked() {
            final int level = mHealthInfo.batteryLevel;
            final int status = mHealthInfo.batteryStatus;
            if (level < mLowBatteryWarningLevel) {
                if (status == BatteryManager.BATTERY_STATUS_CHARGING) {
                    // Solid red when battery is charging
                    mBatteryLight.setColor(mBatteryLowARGB);
                } else {
                    // Flash red when battery is low and not charging
                    mBatteryLight.setFlashing(mBatteryLowARGB, Light.LIGHT_FLASH_TIMED,
                            mBatteryLedOn, mBatteryLedOff);
                }
            } else if (status == BatteryManager.BATTERY_STATUS_CHARGING
                    || status == BatteryManager.BATTERY_STATUS_FULL) {
                if (status == BatteryManager.BATTERY_STATUS_FULL || level >= 90) {
                    // Solid green when full or charging and nearly full
                    mBatteryLight.setColor(mBatteryFullARGB);
                } else {
                    // Solid orange when charging and halfway full
                    mBatteryLight.setColor(mBatteryMediumARGB);
                }
            } else {
                // No lights if not charging and not low
                mBatteryLight.turnOff();
            }
        }

frameworks/base/services/core/java/com/android/server/lights/LightsService.java

		@Override
        public void setFlashing(int color, int mode, int onMS, int offMS) {
            synchronized (this) {
                setLightLocked(color, mode, onMS, offMS, BRIGHTNESS_MODE_USER);
            }
        }

		private void setLightLocked(int color, int mode, int onMS, int offMS, int brightnessMode) {
            if (shouldBeInLowPersistenceMode()) {
                brightnessMode = BRIGHTNESS_MODE_LOW_PERSISTENCE;
            } else if (brightnessMode == BRIGHTNESS_MODE_LOW_PERSISTENCE) {
                brightnessMode = mLastBrightnessMode;
            }

            if (!mInitialized || color != mColor || mode != mMode || onMS != mOnMS ||
                    offMS != mOffMS || mBrightnessMode != brightnessMode) {
                if (DEBUG) Slog.v(TAG, "setLight #" + mId + ": color=#"
                        + Integer.toHexString(color) + ": brightnessMode=" + brightnessMode);
                mInitialized = true;
                mLastColor = mColor;
                mColor = color;
                mMode = mode;
                mOnMS = onMS;
                mOffMS = offMS;
                mBrightnessMode = brightnessMode;
                Trace.traceBegin(Trace.TRACE_TAG_POWER, "setLight(" + mId + ", 0x"
                        + Integer.toHexString(color) + ")");
                try {
                    setLight_native(mId, color, mode, onMS, offMS, brightnessMode);
                } finally {
                    Trace.traceEnd(Trace.TRACE_TAG_POWER);
                }
            }
        }

frameworks/base/services/core/jni/com_android_server_lights_LightsService.cpp
static void setLight_native(
        JNIEnv* /* env */,
        jobject /* clazz */,
        jint light,
        jint colorARGB,
        jint flashMode,
        jint onMS,
        jint offMS,
        jint brightnessMode) {

    if (!sLightSupported) {
        return;
    }

    if (!validate(light, flashMode, brightnessMode)) {
        return;
    }

    Type type = static_cast<Type>(light);
    LightState state = constructState(
        colorARGB, flashMode, onMS, offMS, brightnessMode);

    {
        android::base::Timer t;
        sp<ILight> hal = ILight::getService();
        if (hal == nullptr) {
            sLightSupported = false;
            return;
        }
        Return<Status> ret = hal->setLight(type, state);
        processReturn(ret, type, state);
        if (t.duration() > 50ms) ALOGD("Excessive delay setting light");
    }
}

hardware/interfaces/light/2.0/default/Light.cpp
// Methods from ::android::hardware::light::V2_0::ILight follow.
Return<Status> Light::setLight(Type type, const LightState& state)  {
    auto it = mLights.find(type);

    if (it == mLights.end()) {
        return Status::LIGHT_NOT_SUPPORTED;
    }

    light_device_t* hwLight = it->second;

    light_state_t legacyState {
        .color = state.color,
        .flashMode = static_cast<int>(state.flashMode),
        .flashOnMS = state.flashOnMs,
        .flashOffMS = state.flashOffMs,
        .brightnessMode = static_cast<int>(state.brightnessMode),
    };

    int ret = hwLight->set_light(hwLight, &legacyState);

    switch (ret) {
        case -ENOSYS:
            return Status::BRIGHTNESS_NOT_SUPPORTED;
        case 0:
            return Status::SUCCESS;
        default:
            return Status::UNKNOWN;
    }
}


hardware/qcom/display/liblight/lights.c
static int set_speaker_light_locked(struct light_device_t* dev,
        struct light_state_t const* state)
{
    int red, green, blue;
    int blink;
    int onMS, offMS;
    unsigned int colorRGB;

    if(!dev) {
        return -1;
    }

    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;

#if 0
    ALOGD("set_speaker_light_locked mode %d, colorRGB=%08X, onMS=%d, offMS=%d\n",
            state->flashMode, colorRGB, onMS, offMS);
#endif

    red = (colorRGB >> 16) & 0xFF;
    green = (colorRGB >> 8) & 0xFF;
    blue = colorRGB & 0xFF;

    if (onMS > 0 && offMS > 0) {
        /*
         * if ON time == OFF time
         *   use blink mode 2
         * else
         *   use blink mode 1
         */
        if (onMS == offMS)
            blink = 2;
        else
            blink = 1;
    } else {
        blink = 0;
    }

    if (blink) {
        if (red) {
            if (write_int(RED_BLINK_FILE, blink))
                write_int(RED_LED_FILE, 0);
        }
        if (green) {
            if (write_int(GREEN_BLINK_FILE, blink))
                write_int(GREEN_LED_FILE, 0);
        }
        if (blue) {
            if (write_int(BLUE_BLINK_FILE, blink))
                write_int(BLUE_LED_FILE, 0);
        }
    } else {
        write_int(RED_LED_FILE, red);
        write_int(GREEN_LED_FILE, green);
        write_int(BLUE_LED_FILE, blue);
    }

    return 0;
}

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