編寫android燈光系統的hal程序

編寫android燈光系統的hal程序
Java: frameworks/base/services/core/java/com/android/server/lights/LightsService.java
JNI:  frameworks/base/services/core/jni/com_android_server_lights_LightsService.cpp
Hal:  lights.c

 

public LightsService(Context context) {
        super(context);

        mNativePointer = init_native();

static jlong init_native(JNIEnv *env, jobject clazz)
{
    int err;
   hw_module_t* module;
   Devices* devices;
   
   devices = (Devices*)malloc(sizeof(Devices));

    return (jlong)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;

HAL: lights.c

把新文件上傳到服務器, 所在目錄:
hardware/libhardware/modules/lights/led_hal.c
hardware/libhardware/modules/lights/Android.mk

Android.mk內容如下:
LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)
LOCAL_MODULE := lights.tiny4412
LOCAL_MODULE_RELATIVE_PATH := hw
LOCAL_C_INCLUDES := hardware/libhardware
LOCAL_SRC_FILES := lights.c
LOCAL_SHARED_LIBRARIES := liblog
LOCAL_MODULE_TAGS := eng
include $(BUILD_SHARED_LIBRARY)

 

 

 

 

修改
vi vendor/friendly-arm/tiny4412/device-tiny4412.mk

ifeq ($(BOARD_USES_PWMLIGHTS),false)
#PRODUCT_COPY_FILES += \
#       $(VENDOR_PATH)/proprietary/lights.tiny4412.so:system/lib/hw/lights.tiny4412.so
endif


編譯：
$ mmm hardware/libhardware/modules/lights
$ make snod
$ ./gen-img.sh


內核也需要修改：
1. drivers/leds/led-class.c: 0644 改爲 0666
static struct device_attribute led_class_attrs[] = {
	__ATTR(brightness, 0666, led_brightness_show, led_brightness_store),
	__ATTR(max_brightness, 0444, led_max_brightness_show, NULL),
#ifdef CONFIG_LEDS_TRIGGERS
	__ATTR(trigger, 0666, led_trigger_show, led_trigger_store),
#endif
	__ATTR_NULL,
};

2. drivers/leds/ledtrig-timer.c: 0644 改爲 0666
#if defined(CONFIG_MACH_IPCAM)
static DEVICE_ATTR(delay_on, 0666, led_delay_on_show, led_delay_on_store);
static DEVICE_ATTR(delay_off, 0666, led_delay_off_show, led_delay_off_store);
#else
static DEVICE_ATTR(delay_on, 0666, led_delay_on_show, led_delay_on_store);
static DEVICE_ATTR(delay_off, 0666, led_delay_off_show, led_delay_off_store);
#endif

make zImage



用這個命令確保我們提供的lights.c已經編進system.img:
diff vendor/friendly-arm/tiny4412/proprietary/lights.tiny4412.so out/target/product/tiny4412/system/lib/hw/lights.tiny4412.so


logcat lights:V *:S

 

 

root@android-virtual-machine:/work/android-5.0.2/vendor/friendly-arm# cd tiny4412
root@android-virtual-machine:/work/android-5.0.2/vendor/friendly-arm/tiny4412# ls
Android.mk          libcamera                libgralloc_ump  libsecion  prebuilt     rootdir         wifi
device-tiny4412.mk  libfriendlyarm-hardware  libhwcomposer   mali_ump   proprietary  sechdmiservice
root@android-virtual-machine:/work/android-5.0.2/vendor/friendly-arm/tiny4412# 

hardware/libhardware/modules/lights/lights.c:32:18: error: 'O_RDWR' undeclared (first use in this function)
  fd = open(path, O_RDWR);

out/target/product/tiny4412/system.img maxsize=642318336 blocksize=4224 total=552904348 reserve=6488064

#### make completed successfully (01:01 (mm:ss)) ####

  OBJCOPY arch/arm/boot/zImage
  Kernel: arch/arm/boot/zImage is ready

root@android-virtual-machine:/work/linux-3.0.86# find ./ -name 'zImage'
./arch/arm/boot/zImage
root@android-virtual-machine:/work/linux-3.0.86#