#define LOG_TAG "LedService"#include "jni.h"
#include "JNIHelp.h"
#include "android_runtime/AndroidRuntime.h"#include <utils/misc.h>
#include <utils/Log.h>#include <stdio.h>#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <hardware/led_hal.h>namespace android
{static led_device_t* led_device;jint ledOpen(JNIEnv *env, jobject cls)
{jint err;hw_module_t* module;hw_device_t* device;ALOGI("native ledOpen ...");/* 1. hw_get_module */err = hw_get_module("led", (hw_module_t const**)&module);if (err == 0) {/* 2. get device : module->methods->open */err = module->methods->open(module, NULL, &device);if (err == 0) {/* 3. call led_open */led_device = (led_device_t *)device;return led_device->led_open(led_device);} else {return -1;}}return -1;
}void ledClose(JNIEnv *env, jobject cls)
{//ALOGI("native ledClose ...");//close(fd);
}jint ledCtrl(JNIEnv *env, jobject cls, jint which, jint status)
{ALOGI("native ledCtrl %d, %d", which, status);return led_device->led_ctrl(led_device, which, status);
}static const JNINativeMethod methods[] = {{"native_ledOpen", "()I", (void *)ledOpen},{"native_ledClose", "()V", (void *)ledClose},{"native_ledCtrl", "(II)I", (void *)ledCtrl},
};int register_android_server_LedService(JNIEnv *env)
{return jniRegisterNativeMethods(env, "com/android/server/LedService",methods, NELEM(methods));
}}

#define LOG_TAG "LedHal"/* 1. 实现一个名为HMI的hw_module_t结构体 *//* 2. 实现一个open函数, 它返回led_device_t结构体 *//* 3. 实现led_device_t结构体 *//* 参考 hardware\libhardware\modules\vibrator\vibrator.c*/#include <hardware/vibrator.h>
#include <hardware/hardware.h>#include <cutils/log.h>#include <stdio.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>#include <hardware/led_hal.h>#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <utils/Log.h>static int fd;/** Close this device */
static int led_close(struct hw_device_t* device)
{close(fd);return 0;
}static int led_open(struct led_device_t* dev)
{fd = open("/dev/leds", O_RDWR);ALOGI("led_open : %d", fd);if (fd >= 0)return 0;elsereturn -1;
}static int led_ctrl(struct led_device_t* dev, int which, int status)
{int ret = ioctl(fd, status, which);ALOGI("led_ctrl : %d, %d, %d", which, status, ret);return ret;
}static struct led_device_t led_dev = {.common = {.tag   = HARDWARE_DEVICE_TAG,.close = led_close,},.led_open  = led_open,.led_ctrl  = led_ctrl,
};static int led_device_open(const struct hw_module_t* module, const char* id,struct hw_device_t** device)
{*device = &led_dev;return 0;
}static struct hw_module_methods_t led_module_methods = {.open = led_device_open,
};struct hw_module_t HAL_MODULE_INFO_SYM = {.tag = HARDWARE_MODULE_TAG,.id = "led",.methods = &led_module_methods,
};

#ifndef ANDROID_LED_INTERFACE_H
#define ANDROID_LED_INTERFACE_H#include <stdint.h>
#include <sys/cdefs.h>
#include <sys/types.h>#include <hardware/hardware.h>__BEGIN_DECLSstruct led_device_t {struct hw_device_t common;int (*led_open)(struct led_device_t* dev);int (*led_ctrl)(struct led_device_t* dev, int which, int status);
};__END_DECLS#endif  // ANDROID_LED_INTERFACE_H