Android P指示灯调节代码逻辑

指示灯代码逻辑查看与定义：
默认当低电量时候，指示灯亮灭是1s-1s 的切换；根据产品定义反馈，切换的太过频繁，需要调整修改。
当电量较多时候，不处于低电量时候，系统处于正常的battery实现逻辑中，而当电量低于15之后，电量切换为setBrightness和setColor模式下，出现了闪光灯一直切换的情况。所以其闪烁未按照现有的软件逻辑执行。

LightsService.java

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);}}}

设置执行的主要函数是：setLight_native

    static native void setLight_native(int light, int color, int mode,int onMS, int offMS, int brightnessMode);

根据Jni函数设置找到对应的文件：
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 (!validate(light, flashMode, brightnessMode)) {return;}//连接LightHal节点sp<ILight> hal = LightHal::associate();if (hal == nullptr) {return;}Type type = static_cast<Type>(light);LightState state = constructState(colorARGB, flashMode, onMS, offMS, brightnessMode);{android::base::Timer t;Return<Status> ret = hal->setLight(type, state);processReturn(ret, type, state);if (t.duration() > 50ms) ALOGD("Excessive delay setting light");}
}static LightState constructState(jint colorARGB,jint flashMode,jint onMS,jint offMS,jint brightnessMode){Flash flash = static_cast<Flash>(flashMode);Brightness brightness = static_cast<Brightness>(brightnessMode);LightState state{};if (brightness == Brightness::LOW_PERSISTENCE) {state.flashMode = Flash::NONE;} else {// Only set non-brightness settings when not in low-persistence modestate.flashMode = flash;state.flashOnMs = onMS;state.flashOffMs = offMS;}state.color = colorARGB;state.brightnessMode = brightness;return state;
}

此处插一句：刚刚总是查找android.hardware.light.V2_0.Flash和android.hardware/light.V2_0.Brightnes

import android.hardware.light.V2_0.Flash;
import android.hardware.light.V2_0.Brightness;

此文件的定义在jni中也同样找到：

using Brightness = ::android::hardware::light::V2_0::Brightness;
using Flash      = ::android::hardware::light::V2_0::Flash;
using ILight     = ::android::hardware::light::V2_0::ILight;
using LightState = ::android::hardware::light::V2_0::LightState;
using Status     = ::android::hardware::light::V2_0::Status;
using Type       = ::android::hardware::light::V2_0::Type;

找到匹配文件点：
hardware/interfaces/light/2.0/types.hal

enum Flash : int32_t {/*** Keep the light steady on or off.*/NONE,/*** Flash the light at specified rate.*/TIMED,/*** Flash the light using hardware assist.*/HARDWARE,
};

其对应的外部接口函数为：hardware\interfaces\light\2.0\ILight.hal

package android.hardware.light@2.0;interface ILight {/*** Set the provided lights to the provided values.** @param type logical light to set* @param state describes what the light should look like.* @return status result of applying state transformation.*/setLight(Type type, LightState state) generates (Status status);/*** Discover what indicator lights are available.** @return types list of available lights*/getSupportedTypes() generates (vec<Type> types);};

在\hardware\interfaces\light\2.0\default\Light.cpp文件中的实现过程是：

// 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;}
}

在lights.c文件hardware/qcom/display/liblight/lights.c:
不同的模式下的闪光灯赋予均赋予给set_light 处理；

/******************************************************************************//*** 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_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_BUTTONS, name)) {if (!access(BUTTON_FILE, F_OK)) {// enable light button when the file is presentset_light = set_light_buttons;} else {return -EINVAL;}}else if (0 == strcmp(LIGHT_ID_ATTENTION, name))set_light = set_light_attention;elsereturn -EINVAL;pthread_once(&g_init, init_globals);struct light_device_t *dev = malloc(sizeof(struct light_device_t));if(!dev)return -ENOMEM;memset(dev, 0, sizeof(*dev));dev->common.tag = HARDWARE_DEVICE_TAG;dev->common.version = LIGHTS_DEVICE_API_VERSION_2_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;
}

而我们现在主要是查找关于battery电量的闪烁：

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_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;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;handle_speaker_battery_locked(dev);pthread_mutex_unlock(&g_lock);return 0;
}

进而直接可以找到其实现过程：


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

如果不是按照时间闪烁，则直接on/off 时间直接均赋予为0.

那么可以知道现在指示灯闪烁基本是芯片默认设置。

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Android P指示灯调节代码逻辑

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