修改指示燈狀態
frameworks/base/core/res/res/values
修改充電指示燈狀態
red = (colorRGB >> 16) & 0xFF;
green = (colorRGB >> 8) & 0xFF;
blue = colorRGB & 0xFF;
低電量顯示紅燈，
<!-- Default value for led color when battery is low on charge -->
<integer name="config_notificationsBatteryLowARGB">0xFFFF0000</integer>
充電過程中顯示紅燈 綠燈
<!-- Default value for led color when battery is medium charged -->
<integer name="config_notificationsBatteryMediumARGB">0xFFFFFF00</integer>
充電完畢顯示紅燈 綠燈 藍燈
<!-- Default value for led color when battery is fully charged -->
<integer name="config_notificationsBatteryFullARGB">0xFFFFFFFF</integer>
充電狀態燈指示狀態函數調用
frameworks\base\services\core\java\com\android\server\BatteryService.java
/**
* Synchronize on BatteryService.
*/
public void updateLightsLocked() {
final int level = mBatteryProps.batteryLevel;
final int status = mBatteryProps.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 {
if (isHvdcpPresent()) {
// Blinking orange if HVDCP charger
mBatteryLight.setFlashing(mBatteryMediumARGB, Light.LIGHT_FLASH_TIMED,
mBatteryLedOn, mBatteryLedOn);
} else {
// Solid orange when charging and halfway full
mBatteryLight.setColor(mBatteryMediumARGB);
}
}
} else {
// No lights if not charging and not low
mBatteryLight.turnOff();
}
}
}
LightsService 管理LED
frameworks\base\services\core\java\com\android\server\lights\LightsService.java
函數：
private void setLightLocked(int color, int mode, int onMS, int offMS, int brightnessMode)；
{
//調用JNI函數設置狀態
setLight_native(mNativePointer, mId, color, mode, onMS, offMS, brightnessMode);
}
com_android_server_lights_LightsService.cpp
static void setLight_native(JNIEnv* /* env */, jobject /* clazz */, jlong ptr,jint light, jint colorARGB, jint flashMode, jint onMS, jint offMS, jint brightnessMode)
{
//調用HAL層接口設置指示燈狀態
devices->lights[light]->set_light(devices->lights[light], &state);
}
獲取HAL層接口函數
static jlong 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);
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;
}
HAL層文件地方：
hardware\qcom\display\liblight\lights.c
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 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))
set_light = set_light_buttons;
else if (0 == strcmp(LIGHT_ID_ATTENTION, name))
set_light = set_light_attention;
else if (0 == strcmp(LIGHT_ID_BLUETOOTH, name))
set_light = set_light_bluetooth;
else
return -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 = 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;
}