Android驱动编写LED-NDK程序

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/fs.h>
#include <linux/slab.h>
#include <linux/device.h>
#include <asm/io.h>
#include <asm/uaccess.h>
#include <linux/cdev.h>


MODULE_LICENSE("GPL");

#define GPM4CON 0X110002E0
#define GPM4DAT 0X110002E4

#define LED_ON _IOW(‘G‘,0,int)

#define LED_OFF _IOW(‘G‘,1,int)

static struct cdev dev;//1.1 分配cdev结构

static dev_t dev_no;
struct class *led_class;

static unsigned int *led_con;
static unsigned int *led_dat;

long led_ioctl( struct file *file, unsigned int cmd, unsigned long arg )
{
    switch( cmd )
    {
        case LED_ON:
            writel((readl(led_dat)&(~(0x1<<(arg-1)))),led_dat);
            break;

        case LED_OFF:
            writel( (readl(led_dat)|(0x1<<(arg-1))),led_dat);
            break;

        default: 
            return -EINVAL;        
            break;
    }
    return 0;
}

struct file_operations led_fops = {
    .owner = THIS_MODULE,
    .unlocked_ioctl = led_ioctl,
};


static void hw_init()
{
    
    //初始化GPIO控制寄存器
    led_con = ioremap( GPM4CON, 4 );    //地址映射
    led_dat = ioremap( GPM4DAT, 4 );
    writel((readl(led_con)&~0xffff)|0x1111,led_con);    
    writel(readl(led_dat)|0xf,led_dat);    
    
}

static int led_init()
{
    
    //1.2 初始化cdev结构
    alloc_chrdev_region( &dev_no, 0, 1, "my_led" );
    cdev_init( &dev, &led_fops );    
    dev.owner = THIS_MODULE;
    //1.3 注册cdev结构
    cdev_add( &dev, dev_no, 1 );
    //2.硬件初始化
    hw_init();
    //3.创建设备文件
    led_class = class_create(THIS_MODULE,"my_led");                //创建设备类
    device_create( led_class, NULL, dev_no,NULL,"%s","my_led");

    printk("init led device ok!\n");

    return 0;
}

void led_exit()
{
    device_destroy(led_class,dev_no);
    class_destroy(led_class);

    iounmap(led_con);
    iounmap(led_dat);

    cdev_del(&dev);
    unregister_chrdev_region(dev_no,1);
}

module_init( led_init );
module_exit( led_exit );

javah -d jni -classpath /opt/android-sdk-linux/platforms/android-23/android.jar:/home/my_Android/led\
/NDK/NDK_APP/app/build/intermediates/classes/debug/ com.android.jack.ndk.happy.MainActivity

LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)
LOCAL_MODULE := ndk_test_myled
LOCAL_SRC_FILES := ndk_led.c
include $(BUILD_SHARED_LIBRARY)