基于 Light 介绍安卓 8.0 HAL 变化
/frameworks/base/services/core/java/com/android/server/lights/LightsService.java
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149 |
public class LightsService extends SystemService {
static final String TAG = "LightsService";
@Nullable
private final Supplier<ILights> mVintfLights;
... ...
private final class LightsManagerBinderService extends ILightsManager.Stub {
... ...
}
... ...
public LightsService(Context context) {
this(context, new VintfHalCache(), Looper.myLooper());
}
@VisibleForTesting
LightsService(Context context, Supplier<ILights> service, Looper looper) {
super(context);
mH = new Handler(looper);
mVintfLights = service.get() != null ? service : null;
populateAvailableLights(context);
mManagerService = new LightsManagerBinderService();
}
private void populateAvailableLights(Context context) {
if (mVintfLights != null) {
populateAvailableLightsFromAidl(context);
} else {
populateAvailableLightsFromHidl(context);
}
for (int i = mLightsById.size() - 1; i >= 0; i--) {
final int type = mLightsById.keyAt(i);
if (0 <= type && type < mLightsByType.length) {
mLightsByType[type] = mLightsById.valueAt(i);
}
}
}
private void populateAvailableLightsFromAidl(Context context) {
try {
for (HwLight hwLight : mVintfLights.get().getLights()) {
mLightsById.put(hwLight.id, new LightImpl(context, hwLight));
}
} catch (RemoteException ex) {
Slog.e(TAG, "Unable to get lights from HAL", ex);
}
}
... ...
private final class LightImpl extends LogicalLight {
.... ....
@Override
public void setBrightness(float brightness) {
setBrightness(brightness, BRIGHTNESS_MODE_USER);
}
@Override
public void setBrightness(float brightness, int brightnessMode) {
if (Float.isNaN(brightness)) {
Slog.w(TAG, "Brightness is not valid: " + brightness);
return;
}
synchronized (this) {
// LOW_PERSISTENCE cannot be manually set
if (brightnessMode == BRIGHTNESS_MODE_LOW_PERSISTENCE) {
Slog.w(TAG, "setBrightness with LOW_PERSISTENCE unexpected #" + mHwLight.id
+ ": brightness=" + brightness);
return;
}
// Ideally, we'd like to set the brightness mode through the SF/HWC as well, but
// right now we just fall back to the old path through Lights brightessMode is
// anything but USER or the device shouldBeInLowPersistenceMode().
if (brightnessMode == BRIGHTNESS_MODE_USER && !shouldBeInLowPersistenceMode()
&& mSurfaceControlMaximumBrightness == 255) {
// New system
// TODO: the last check should be mSurfaceControlMaximumBrightness != 0; the
// reason we enforce 255 right now is to stay consistent with the old path. In
// the future, the framework should be refactored so that brightness is a float
// between 0.0f and 1.0f, and the actual number of supported brightness levels
// is determined in the device-specific implementation.
if (DEBUG) {
Slog.d(TAG, "Using new setBrightness path!");
}
SurfaceControl.setDisplayBrightness(mDisplayToken, brightness);
} else {
// Old system
int brightnessInt = BrightnessSynchronizer.brightnessFloatToInt(
getContext(), brightness);
int color = brightnessInt & 0x000000ff;
color = 0xff000000 | (color << 16) | (color << 8) | color;
setLightLocked(color, LIGHT_FLASH_NONE, 0, 0, brightnessMode);
}
}
}
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 #" + mHwLight.id + ": color=#"
+ Integer.toHexString(color) + ": brightnessMode=" + brightnessMode);
}
mInitialized = true;
mLastColor = mColor;
mColor = color;
mMode = mode;
mOnMS = onMS;
mOffMS = offMS;
mBrightnessMode = brightnessMode;
setLightUnchecked(color, mode, onMS, offMS, brightnessMode);
}
}
private void setLightUnchecked(int color, int mode, int onMS, int offMS,
int brightnessMode) {
Trace.traceBegin(Trace.TRACE_TAG_POWER, "setLightState(" + mHwLight.id + ", 0x"
+ Integer.toHexString(color) + ")");
//add for bug1296210
if (!mSprdLightsUtils.isBatteryOpenWhenNotificationCome(mHwLight.id, color)) {
try {
if (mVintfLights != null) {
HwLightState lightState = new HwLightState();
lightState.color = color;
lightState.flashMode = (byte) mode;
lightState.flashOnMs = onMS;
lightState.flashOffMs = offMS;
lightState.brightnessMode = (byte) brightnessMode;
mVintfLights.get().setLightState(mHwLight.id, lightState); //aidl
} else {
setLight_native(mHwLight.id, color, mode, onMS, offMS, brightnessMode); //jni->hidl->hal
}
} catch (RemoteException | UnsupportedOperationException ex) {
Slog.e(TAG, "Failed issuing setLightState", ex);
} finally {
Trace.traceEnd(Trace.TRACE_TAG_POWER);
}
}
}
... ...
}
... ...
static native void setLight_native(int light, int color, int mode,
int onMS, int offMS, int brightnessMode);
} |
一、通过jni的方式：
1. 8.0之前jni->hal
\frameworks\base\services\core\Android.mk
LOCAL_MODULE := services.core
\frameworks\base\services\core\jni\Android.mk
LOCAL_SRC_FILES += \
$(LOCAL_REL_DIR)/com_android_server_lights_LightsService.cpp \
... ...
/frameworks/base/services/core/jni/com_android_server_lights_LightsService.cpp
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/*
* Copyright (C) 2009 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 "LightsService"
#include "jni.h"
#include "JNIHelp.h"
#include "android_runtime/AndroidRuntime.h"
#include <utils/misc.h>
#include <utils/Log.h>
#include <hardware/hardware.h>
#include <hardware/lights.h> //hal层也include了这个
#include <stdio.h>
namespace android
{
// These values must correspond with the LIGHT_ID constants in
// LightsService.java
enum {
LIGHT_INDEX_BACKLIGHT = 0,
LIGHT_INDEX_KEYBOARD = 1,
LIGHT_INDEX_BUTTONS = 2,
LIGHT_INDEX_BATTERY = 3,
LIGHT_INDEX_NOTIFICATIONS = 4,
LIGHT_INDEX_ATTENTION = 5,
LIGHT_INDEX_BLUETOOTH = 6,
LIGHT_INDEX_WIFI = 7,
LIGHT_COUNT
};
struct Devices {
light_device_t* lights[LIGHT_COUNT];
};
static light_device_t* get_device(hw_module_t* module, char const* name)
{
int err;
hw_device_t* device;
err = module->methods->open(module, name, &device); //将二级指针&device传给hal层
if (err == 0) { //hardware/libhardware/include/hardware/lights.h
return (light_device_t*)device; //强转为与hal层同一类型
} else {
return NULL;
}
}
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); //保存着hal层赋值的具体函数指针
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;
}
static void finalize_native(JNIEnv* /* env */, jobject /* clazz */, jlong ptr)
{
Devices* devices = (Devices*)ptr;
if (devices == NULL) {
return;
}
free(devices);
}
static void setLight_native(JNIEnv* /* env */, jobject /* clazz */, jlong ptr,
jint light, jint colorARGB, jint flashMode, jint onMS, jint offMS, jint brightnessMode)
{
Devices* devices = (Devices*)ptr;
light_state_t state;
if (light < 0 || light >= LIGHT_COUNT || devices->lights[light] == NULL) {
return ;
}
uint32_t version = devices->lights[light]->common.version;
memset(&state, 0, sizeof(light_state_t));
if (brightnessMode == BRIGHTNESS_MODE_LOW_PERSISTENCE) {
if (light != LIGHT_INDEX_BACKLIGHT) {
ALOGE("Cannot set low-persistence mode for non-backlight device.");
return;
}
if (version < LIGHTS_DEVICE_API_VERSION_2_0) {
// HAL impl has not been upgraded to support this.
return;
}
} else {
// Only set non-brightness settings when not in low-persistence mode
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); //调用hal层函数指针设置背光
}
}
static const JNINativeMethod method_table[] = {
{ "init_native", "()J", (void*)init_native },
{ "finalize_native", "(J)V", (void*)finalize_native },
{ "setLight_native", "(JIIIIII)V", (void*)setLight_native },
};
int register_android_server_LightsService(JNIEnv *env)
{
return jniRegisterNativeMethods(env, "com/android/server/lights/LightsService",
method_table, NELEM(method_table));
}
}; |
2. 8.0之后jni->HIDL->HAL
JNI:
\frameworks\base\services\core\jni\Android.mk
cc_library_static {
name: "libservices.core",
... ...
srcs: [
":lib_alarmManagerService_native",
"com_android_server_lights_LightsService.cpp",
... ...
":lib_networkStatsFactory_native",
}
/frameworks/base/services/core/jni/com_android_server_lights_LightsService.cpp
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62 |
#define LOG_TAG "LightsService"
#include <android/hardware/light/2.0/ILight.h> //对应着ILight.hal
#include <android/hardware/light/2.0/types.h> //对应着types.hal
... ...
namespace android {
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;
template<typename T>
using Return = ::android::hardware::Return<T>;
static bool sLightSupported = true;
... ...
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(); //获取hidl服务
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");
}
}
static const JNINativeMethod method_table[] = {
{ "setLight_native", "(IIIIII)V", (void*)setLight_native },
};
int register_android_server_LightsService(JNIEnv *env) {
return jniRegisterNativeMethods(env, "com/android/server/lights/LightsService",
method_table, NELEM(method_table));
}
}; |
HIDL interface:
/hardware/interfaces/light/2.0/Android.bp
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// This file is autogenerated by hidl-gen -Landroidbp.
hidl_interface {
name: "[email protected]",
root: "android.hardware",
vndk: {
enabled: true,
},
srcs: [
"types.hal",
"ILight.hal",
],
interfaces: [
"[email protected]",
],
gen_java: true,
} |
/hardware/interfaces/light/2.0/types.hal
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57 |
package [email protected];
... ...
/**
* These light IDs correspond to logical lights, not physical.
* So for example, if your INDICATOR light is in line with your
* BUTTONS, it might make sense to also light the INDICATOR
* light to a reasonable color when the BUTTONS are lit.
*/
enum Type : int32_t {
BACKLIGHT,
KEYBOARD,
BUTTONS,
BATTERY,
NOTIFICATIONS,
ATTENTION,
BLUETOOTH,
WIFI,
COUNT,
};
/**
* The parameters that can be set for a given light.
*
* Not all lights must support all parameters. If you
* can do something backward-compatible, do it.
*/
struct LightState {
/**
* The color of the LED in ARGB.
*
* Do your best here.
* - If your light can only do red or green, if they ask for blue,
* you should do green.
* - If you can only do a brightness ramp, then use this formula:
* unsigned char brightness = ((77*((color>>16)&0x00ff))
* + (150*((color>>8)&0x00ff)) + (29*(color&0x00ff))) >> 8;
* - If you can only do on or off, 0 is off, anything else is on.
*
* The high byte should be ignored. Callers will set it to 0xff (which
* would correspond to 255 alpha).
*/
uint32_t color;
/**
* To flash the light at a given rate, set flashMode to LIGHT_FLASH_TIMED,
* and then flashOnMS should be set to the number of milliseconds to turn
* the light on, followed by the number of milliseconds to turn the light
* off.
*/
Flash flashMode;
int32_t flashOnMs;
int32_t flashOffMs;
Brightness brightnessMode;
}; |
/hardware/interfaces/light/2.0/ILight.hal
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package [email protected];
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);
}; |
HIDL:
/vendor/mediatek/proprietary/hardware/liblights/2.0/default/[email protected]
service light-hal-2-0 /vendor/bin/hw/[email protected]
interface [email protected]::ILight default
class hal
user system
group system
# shutting off lights while powering-off
shutdown critical
/vendor/mediatek/proprietary/hardware/liblights/2.0/default/service.cpp
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#define NDEBUG 1
#define LOG_TAG "[email protected]"
#include <android/hardware/light/2.0/ILight.h>
#include <hidl/LegacySupport.h>
using android::hardware::light::V2_0::ILight;
using android::hardware::defaultPassthroughServiceImplementation;
int main() {
return defaultPassthroughServiceImplementation<ILight>();
} |
/vendor/mediatek/proprietary/hardware/liblights/2.0/default/Android.mk
LOCAL_PATH := $(call my-dir) //用于返回当前mk文件路径，由build system提供
include $(CLEAR_VARS)
LOCAL_MODULE_RELATIVE_PATH := hw
LOCAL_MODULE := [email protected]
LOCAL_INIT_RC := [email protected]
LOCAL_SRC_FILES := service.cpp //生成在\out\target\product\tb8321p3_bsp\vendor\bin\hw\[email protected]
... ...
include $(BUILD_EXECUTABLE) //对应Android.bp的 cc_binary{
include $(CLEAR_VARS) //让GNU MAKEFILE为你清除除LOCAL_PATH以外的所有LOCAL_XXX变量，因为所有的编译控制文件都在同一个GNU MAKE执行环境中，所有的变量都是全局的。
LOCAL_MODULE := [email protected]
LOCAL_MODULE_RELATIVE_PATH := hw //生成在\out\target\product\tb8321p3_bsp\vendor\lib\hw\[email protected]
LOCAL_SRC_FILES := \
Light.cpp \
... ...
include $(BUILD_SHARED_LIBRARY) //对应Android.bp的 cc_library_shared{
/vendor/mediatek/proprietary/hardware/liblights/2.0/default/Light.h
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48 |
#ifndef ANDROID_HARDWARE_LIGHT_V2_0_LIGHT_H
#define ANDROID_HARDWARE_LIGHT_V2_0_LIGHT_H
#include <android/hardware/light/2.0/ILight.h> //对应着ILight.hal
#include <hardware/hardware.h>
#include <hardware/lights.h>
#include <hidl/Status.h>
#include <hidl/MQDescriptor.h>
#include <map>
#include <cutils/log.h>
namespace android {
namespace hardware {
namespace light {
namespace V2_0 {
namespace implementation {
using ::android::hardware::light::V2_0::ILight;
using ::android::hardware::light::V2_0::LightState;
using ::android::hardware::light::V2_0::Status;
using ::android::hardware::light::V2_0::Type;
using ::android::hardware::Return;
using ::android::hardware::Void;
using ::android::hardware::hidl_vec;
using ::android::hardware::hidl_string;
using ::android::sp;
struct Light : public ILight {
Light(std::map<Type, light_device_t*> &&lights);
// Methods from ::android::hardware::light::V2_0::ILight follow.
Return<Status> setLight(Type type, const LightState& state) override;
Return<void> getSupportedTypes(getSupportedTypes_cb _hidl_cb) override;
private:
std::map<Type, light_device_t*> mLights;
};
extern "C" ILight* HIDL_FETCH_ILight(const char* name);
} // namespace implementation
} // namespace V2_0
} // namespace light
} // namespace hardware
} // namespace android
#endif // ANDROID_HARDWARE_LIGHT_V2_0_LIGHT_H |
/vendor/mediatek/proprietary/hardware/liblights/2.0/default/Light.cpp
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/*
* Copyright (C) 2016 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.
*/
#include "Light.h"
namespace android {
namespace hardware {
namespace light {
namespace V2_0 {
namespace implementation {
static_assert(LIGHT_FLASH_NONE == static_cast<int>(Flash::NONE),
"Flash::NONE must match legacy value.");
static_assert(LIGHT_FLASH_TIMED == static_cast<int>(Flash::TIMED),
"Flash::TIMED must match legacy value.");
static_assert(LIGHT_FLASH_HARDWARE == static_cast<int>(Flash::HARDWARE),
"Flash::HARDWARE must match legacy value.");
static_assert(BRIGHTNESS_MODE_USER == static_cast<int>(Brightness::USER),
"Brightness::USER must match legacy value.");
static_assert(BRIGHTNESS_MODE_SENSOR == static_cast<int>(Brightness::SENSOR),
"Brightness::SENSOR must match legacy value.");
static_assert(BRIGHTNESS_MODE_LOW_PERSISTENCE ==
static_cast<int>(Brightness::LOW_PERSISTENCE),
"Brightness::LOW_PERSISTENCE must match legacy value.");
Light::Light(std::map<Type, light_device_t*> &&lights)
: mLights(std::move(lights)) {} //将lights转换为右值，相当于mlights=lights
// Methods from ::android::hardware::light::V2_0::ILight follow.
Return<Status> Light::setLight(Type type, const LightState& state) {
auto it = mLights.find(type); //找到具体light type的light_device_t *(即hal层的函数指针)
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;
}
}
Return<void> Light::getSupportedTypes(getSupportedTypes_cb _hidl_cb) {
Type *types = new Type[mLights.size()];
int idx = 0;
for(auto const &pair : mLights) {
Type type = pair.first;
types[idx++] = type;
}
{
hidl_vec<Type> hidl_types{};
hidl_types.setToExternal(types, mLights.size());
_hidl_cb(hidl_types);
}
delete[] types;
return Void();
}
const static std::map<Type, const char*> kLogicalLights = {
{Type::BACKLIGHT, LIGHT_ID_BACKLIGHT},
{Type::KEYBOARD, LIGHT_ID_KEYBOARD},
{Type::BUTTONS, LIGHT_ID_BUTTONS},
{Type::BATTERY, LIGHT_ID_BATTERY},
{Type::NOTIFICATIONS, LIGHT_ID_NOTIFICATIONS},
{Type::ATTENTION, LIGHT_ID_ATTENTION},
{Type::BLUETOOTH, LIGHT_ID_BLUETOOTH},
{Type::WIFI, LIGHT_ID_WIFI}
};
light_device_t* getLightDevice(const char* name) {
light_device_t* lightDevice;
const hw_module_t* hwModule = NULL;
int ret = hw_get_module (LIGHTS_HARDWARE_MODULE_ID, &hwModule);
if (ret == 0) {
ret = hwModule->methods->open(hwModule, name,
reinterpret_cast<hw_device_t**>(&lightDevice)); //将二级指针&lightDevice传给hal层
if (ret != 0) {
ALOGE("light_open %s %s failed: %d", LIGHTS_HARDWARE_MODULE_ID, name, ret);
}
} else {
ALOGE("hw_get_module %s %s failed: %d", LIGHTS_HARDWARE_MODULE_ID, name, ret);
}
if (ret == 0) {
return lightDevice;
} else {
ALOGE("Light passthrough failed to load legacy HAL.");
return nullptr;
}
}
ILight* HIDL_FETCH_ILight(const char* /* name */) { //HIDL直通式
std::map<Type, light_device_t*> lights;
for(auto const &pair : kLogicalLights) { //遍历所有的light type
Type type = pair.first;
const char* name = pair.second;
light_device_t* light = getLightDevice(name);
if (light != nullptr) {
lights[type] = light;
}
}
if (lights.size() == 0) {
// Log information, but still return new Light.
// Some devices may not have any lights.
ALOGI("Could not open any lights.");
}
return new Light(std::move(lights));
}
} // namespace implementation
} // namespace V2_0
} // namespace light
} // namespace hardware
} // namespace android |
HAL:
/vendor/mediatek/proprietary/hardware/liblights/Android.mk
LOCAL_PATH:= $(call my-dir)
# HAL module implemenation, not prelinked and stored in
# hw/<COPYPIX_HARDWARE_MODULE_ID>.<ro.board.platform>.so
include $(CLEAR_VARS)
LOCAL_HEADER_LIBRARIES := libhardware_headers
LOCAL_MULTILIB := both
LOCAL_MODULE_TAGS := optional
LOCAL_PRELINK_MODULE := false
LOCAL_MODULE_RELATIVE_PATH := hw
LOCAL_SHARED_LIBRARIES := liblog
LOCAL_MODULE := lights.$(TARGET_BOARD_PLATFORM)
LOCAL_PROPRIETARY_MODULE := true
LOCAL_MODULE_OWNER := mtk
include $(MTK_SHARED_LIBRARY)
include $(call all-makefiles-under, $(LOCAL_PATH))
./tb8321p3_bsp/vendor/lib/hw/lights.mt6580.so
./tb8321p3_bsp/symbols/vendor/lib/hw/lights.mt6580.so
/hardware/libhardware/include/hardware/lights.h
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/*
* These light IDs correspond to logical lights, not physical.
* So for example, if your INDICATOR light is in line with your
* BUTTONS, it might make sense to also light the INDICATOR
* light to a reasonable color when the BUTTONS are lit.
*/
#define LIGHT_ID_BACKLIGHT "backlight"
#define LIGHT_ID_KEYBOARD "keyboard"
#define LIGHT_ID_BUTTONS "buttons"
#define LIGHT_ID_BATTERY "battery"
#define LIGHT_ID_NOTIFICATIONS "notifications"
#define LIGHT_ID_ATTENTION "attention"
struct light_device_t {
struct hw_device_t common;
/**
* Set the provided lights to the provided values.
*
* Returns: 0 on succes, error code on failure.
*/
int (*set_light)(struct light_device_t* dev,
struct light_state_t const* state);
}; |
/vendor/mediatek/proprietary/hardware/liblights/lights.c
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#define LOG_TAG "lights"
#include <hardware/lights.h> //jni也include了这个(jni->hal)、hidl也include了这个(jni->hidl->hal)
... ...
/* LCD BACKLIGHT */
char const*const LCD_FILE
= "/sys/class/leds/lcd-backlight/brightness";
... ...
/** 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;
if (access(LCD_FILE, F_OK) < 0)
return -errno;
}
else if (0 == strcmp(LIGHT_ID_KEYBOARD, name)) {
set_light = set_light_keyboard;
if (access(KEYBOARD_FILE, F_OK) < 0)
return -errno;
}
else if (0 == strcmp(LIGHT_ID_BUTTONS, name)) {
set_light = set_light_buttons;
if (access(BUTTON_FILE, F_OK) < 0)
return -errno;
}
else if (0 == strcmp(LIGHT_ID_BATTERY, name)) {
set_light = set_light_battery;
if (access(RED_LED_FILE, F_OK) < 0)
return -errno;
if (access(GREEN_LED_FILE, F_OK) < 0)
return -errno;
if (access(BLUE_LED_FILE, F_OK) < 0)
return -errno;
}
else if (0 == strcmp(LIGHT_ID_NOTIFICATIONS, name)) {
set_light = set_light_notifications;
if (access(RED_LED_FILE, F_OK) < 0)
return -errno;
if (access(GREEN_LED_FILE, F_OK) < 0)
return -errno;
if (access(BLUE_LED_FILE, F_OK) < 0)
return -errno;
}
else if (0 == strcmp(LIGHT_ID_ATTENTION, name)) {
set_light = set_light_attention;
if (access(RED_LED_FILE, F_OK) < 0)
return -errno;
if (access(GREEN_LED_FILE, F_OK) < 0)
return -errno;
if (access(BLUE_LED_FILE, F_OK) < 0)
return -errno;
}
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; //将jni或者hidl传进来的二级指针赋值为具体的函数指针
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,
};
|
/vendor/mediatek/proprietary/hardware/liblights/lights.c
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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 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;
} |
二、通过aidl的方式：
/hardware/interfaces/light/aidl/android/hardware/light/ILights.aidl
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package android.hardware.light;
import android.hardware.light.HwLightState;
import android.hardware.light.HwLight;
/**
* Allows controlling logical lights/indicators, mapped to LEDs in a
* hardware-specific manner by the HAL implementation.
*/
@VintfStability
interface ILights {
/**
* Set light identified by id to the provided state.
*
* If control over an invalid light is requested, this method exists with
* EX_UNSUPPORTED_OPERATION. Control over supported lights is done on a
* device-specific best-effort basis and unsupported sub-features will not
* be reported.
*
* @param id ID of logical light to set as returned by getLights()
* @param state describes what the light should look like.
*/
void setLightState(in int id, in HwLightState state);
/**
* Discover what lights are supported by the HAL implementation.
*
* @return List of available lights
*/
HwLight[] getLights();
} |
/vendor/mediatek/proprietary/hardware/liblights/aidl/default/Android.bp
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cc_binary {
name: "android.hardware.lights-service.mediatek",
relative_install_path: "hw",
init_rc: ["lights-mtk-default.rc"],
vintf_fragments: ["lights-mtk-default.xml"],
vendor: true,
shared_libs: [
"libbase",
"libutils",
"liblog",
"libbinder_ndk",
"android.hardware.light-ndk_platform",
"libhardware",
"libhardware_legacy",
],
srcs: [
"Lights.cpp",
"main.cpp", #ABinderProcess_joinThreadPool();
],
} |
androidgroup04@androidgroup04:~/disk00/Isaac/MT8168_alps-mp-r0.mp5/alps/out/target/product/tb8168p1_64_bsp$ find -name "*android.hardware.lights-service.mediatek*"
./vendor/bin/hw/android.hardware.lights-service.mediatek
./obj/EXECUTABLES/android.hardware.lights-service.mediatek_intermediates
./obj/EXECUTABLES/android.hardware.lights-service.mediatek_intermediates/android.hardware.lights-service.mediatek
./obj/PACKAGING/vendor_target_files_intermediates/vnd_tb8168p1_64_bsp-vendor_target_files-mp5V4381/VENDOR/bin/hw/android.hardware.lights-service.mediatek
./symbols/vendor/bin/hw/android.hardware.lights-service.mediatek
/vendor/mediatek/proprietary/hardware/liblights/aidl/default/Lights.cpp
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#include "Lights.h"
namespace aidl {
namespace android {
namespace hardware {
namespace light {
using ::aidl::android::hardware::light::BnLights;
using ::aidl::android::hardware::light::HwLight;
using ::aidl::android::hardware::light::HwLightState;
using ::aidl::android::hardware::light::ILights;
using ::aidl::android::hardware::light::LightType;
using ::aidl::android::hardware::light::FlashMode;
... ...
ndk::ScopedAStatus Lights::setLightState(int id, const HwLightState& state) {
#ifdef LIGHTS_INFO_ON
ALOGD("Lights setting state for id=%d, color=%0x\n",
id, state.color);
#endif
if (!(0 <= id && id < availableLights.size())) {
ALOGI("Lights id %d does not exist.", id);
return ndk::ScopedAStatus::fromExceptionCode(EX_UNSUPPORTED_OPERATION);
}
//int const color = rgbToBrightness(state.color);
HwLight const* light = &(availableLights[id]);
int ret = 0;
switch (light->type) {
case LightType::BACKLIGHT:
ret = set_light_backlight(light, &state);
break;
case LightType::KEYBOARD:
ret = set_light_keyboard(light, &state);
break;
case LightType::BUTTONS:
ret = set_light_buttons(light, &state);
break;
case LightType::BATTERY:
ret = set_light_battery(light, &state);
break;
case LightType::NOTIFICATIONS:
ret = set_light_notifications(light, &state);
break;
case LightType::ATTENTION:
ret = set_light_attention(light, &state);
break;
default:
return ndk::ScopedAStatus::fromServiceSpecificError(EX_UNSUPPORTED_OPERATION);
}
switch (ret) {
case -ENXIO:
ALOGI("Lights id %d return %d.", id, ret);
case 0:
return ndk::ScopedAStatus::ok();
default:
ALOGI("Lights id %d return %d.", id, ret);
return ndk::ScopedAStatus::fromServiceSpecificError(EX_UNSUPPORTED_OPERATION);
}
}
} // namespace light
} // namespace hardware
} // namespace android
} // namespace aidl |
/vendor/mediatek/proprietary/hardware/liblights/aidl/default/Lights.h
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/* LCD BACKLIGHT */
char const*const LCD_FILE
= "/sys/class/leds/lcd-backlight/brightness"; |
/vendor/mediatek/proprietary/hardware/liblights/aidl/default/Lights.cpp
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static int
set_light_backlight(HwLight const* light, HwLightState const* state)
{
if(!light) {
return -1;
}
int err = 0;
int brightness = rgb_to_brightness(state);
if (!device_exists(LCD_FILE)) {
return -ENXIO;
}
#ifdef LIGHTS_INFO_ON
ALOGD("set_light_backlight, level=%d, onMS=%d, offMS=%d\n",
brightness, state->flashOnMs, state->flashOffMs);
#endif
pthread_mutex_lock(&g_lock);
g_backlight = brightness;
err = write_int(LCD_FILE, brightness);
if (g_haveTrackballLight) {
handle_trackball_light_locked(light, state);
}
pthread_mutex_unlock(&g_lock);
return err;
} |
/vendor/mediatek/proprietary/hardware/liblights/aidl/default/Lights.cpp
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static int write_int(char const* path, int value)
{
int fd = -1, ret = 0;
#ifdef LIGHTS_DBG_ON
ALOGD("write %d to %s", value, path);
#endif
fd = open(path, O_RDWR);
if (fd >= 0) {
char buffer[20];
int bytes = snprintf(buffer, sizeof(buffer), "%d\n", value); //将背光亮度格式化为字符串保存在buffer，返回字符串长度
if (bytes >= sizeof(buffer)) {
ret = -EINVAL;
ALOGE("write error1 %d to %s, ret=%d", value, path, ret);
} else {
int amt = write(fd, buffer, bytes); //往节点写数据
ret = (amt == -1 ? -errno : 0);
}
close(fd);
fd = -1;
} else {
ret = -errno;
ALOGE("write %d to %s, result: %d", value, path, ret);
}
ALOGD("write %d to %s, result: %d", value, path, ret);
return ret;
} |
==================================================================