#include <linux/module.h>#include <linux/kernel.h>#include <linux/fs.h>#include <linux/init.h>#include <linux/delay.h>#include <asm/uaccess.h>#include <asm/irq.h>#include <asm/io.h>#include <asm/arch/regs-gpio.h>#include <asm/hardware.h>#define DEVICE_NAME     "leds"  /* 加载模式后，执行”cat /proc/devices”命令看到的设备名称 */#define LED_MAJOR       231     /* 主设备号 */static struct class *leds_class;static struct class_device    *leds_class_devs[4];/* bit0<=>D10, 0:亮, 1:灭 *  bit1<=>D11, 0:亮, 1:灭 *  bit2<=>D12, 0:亮, 1:灭 */static char leds_status = 0x0;static DECLARE_MUTEX(leds_lock); // 定义赋值//static int minor;static unsigned long gpio_va;#define GPIO_OFT(x) ((x) - 0x56000000)#define GPFCON  (*(volatile unsigned long *)(gpio_va + GPIO_OFT(0x56000050)))//oo00:GPFCON  0x56000050  R/W  配置端口F的引脚#define GPFDAT  (*(volatile unsigned long *)(gpio_va + GPIO_OFT(0x56000054)))//oo00:gpio_va + 0x54 ，把物理地址0x56000054映射为虚拟地址GPFDAT。//led驱动中，要操作io口，必须要把物理地址映射为虚拟地址。/* 应用程序对设备文件/dev/leds执行open(...)时， * 就会调用s3c24xx_leds_open函数 */static int s3c24xx_leds_open(struct inode *inode, struct file *file){    int minor = MINOR(inode->i_rdev); //MINOR(inode->i_cdev);    switch(minor)    {        case 0: /* /dev/leds */        {            // 配置3引脚为输出            //s3c2410_gpio_cfgpin(S3C2410_GPF4, S3C2410_GPF4_OUTP);            GPFCON &= ~(0x3<<(4*2)); //oo00:这里GPFCON是虚拟地址，在驱动模块开始的时候，这个虚拟地址已经通过宏定义 #define GPFCON  (*(volatile unsigned long *)(gpio_va + GPIO_OFT(0x56000050)))被映射到物理地址            GPFCON |= (1<<(4*2));            //s3c2410_gpio_cfgpin(S3C2410_GPF5, S3C2410_GPF5_OUTP);            GPFCON &= ~(0x3<<(5*2));            GPFCON |= (1<<(5*2));            //s3c2410_gpio_cfgpin(S3C2410_GPF6, S3C2410_GPF6_OUTP);            GPFCON &= ~(0x3<<(6*2));            GPFCON |= (1<<(6*2));            // 都输出0            //s3c2410_gpio_setpin(S3C2410_GPF4, 0);            GPFDAT &= ~(1<<4);            //s3c2410_gpio_setpin(S3C2410_GPF5, 0);            GPFDAT &= ~(1<<5);            //s3c2410_gpio_setpin(S3C2410_GPF6, 0);            GPFDAT &= ~(1<<6);            down(&leds_lock);            leds_status = 0x0;            up(&leds_lock);            break;        }        case 1: /* /dev/led1 */        {            s3c2410_gpio_cfgpin(S3C2410_GPF4, S3C2410_GPF4_OUTP);            s3c2410_gpio_setpin(S3C2410_GPF4, 0);            down(&leds_lock);            leds_status &= ~(1<<0);            up(&leds_lock);            break;        }        case 2: /* /dev/led2 */        {            s3c2410_gpio_cfgpin(S3C2410_GPF5, S3C2410_GPF5_OUTP);            s3c2410_gpio_setpin(S3C2410_GPF5, 0);            leds_status &= ~(1<<1);            break;        }        case 3: /* /dev/led3 */        {            s3c2410_gpio_cfgpin(S3C2410_GPF6, S3C2410_GPF6_OUTP);            s3c2410_gpio_setpin(S3C2410_GPF6, 0);            down(&leds_lock);            leds_status &= ~(1<<2);            up(&leds_lock);            break;        }    }    return 0;}static int s3c24xx_leds_read(struct file *filp, char __user *buff,                                         size_t count, loff_t *offp){    int minor = MINOR(filp->f_dentry->d_inode->i_rdev);    char val;    switch (minor)    {        case 0: /* /dev/leds */        {            copy_to_user(buff, (const void *)&leds_status, 1);            break;        }        case 1: /* /dev/led1 */        {            down(&leds_lock);            val = leds_status & 0x1;            up(&leds_lock);            copy_to_user(buff, (const void *)&val, 1);            break;        }        case 2: /* /dev/led2 */        {            down(&leds_lock);            val = (leds_status>>1) & 0x1;            up(&leds_lock);            copy_to_user(buff, (const void *)&val, 1);            break;        }        case 3: /* /dev/led3 */        {            down(&leds_lock);            val = (leds_status>>2) & 0x1;            up(&leds_lock);            copy_to_user(buff, (const void *)&val, 1);            break;        }    }    return 1;}static ssize_t s3c24xx_leds_write(struct file *file, const char __user *buf, size_t count, loff_t * ppos){    //int minor = MINOR(inode->i_rdev); //MINOR(inode->i_cdev);    int minor = MINOR(file->f_dentry->d_inode->i_rdev);    char val;    copy_from_user(&val, buf, 1);    switch (minor)    {        case 0: /* /dev/leds */        {            s3c2410_gpio_setpin(S3C2410_GPF4, (val & 0x1));            s3c2410_gpio_setpin(S3C2410_GPF5, (val & 0x1));            s3c2410_gpio_setpin(S3C2410_GPF6, (val & 0x1));            down(&leds_lock);            leds_status = val;            up(&leds_lock);            break;        }        case 1: /* /dev/led1 */        {            s3c2410_gpio_setpin(S3C2410_GPF4, val);            if (val == 0)            {                down(&leds_lock);                leds_status &= ~(1<<0);                up(&leds_lock);            }            else            {                down(&leds_lock);                leds_status |= (1<<0);                up(&leds_lock);            }            break;        }        case 2: /* /dev/led2 */        {            s3c2410_gpio_setpin(S3C2410_GPF5, val);            if (val == 0)            {                down(&leds_lock);                leds_status &= ~(1<<1);                up(&leds_lock);            }            else            {                down(&leds_lock);                leds_status |= (1<<1);                up(&leds_lock);            }            break;        }        case 3: /* /dev/led3 */        {            s3c2410_gpio_setpin(S3C2410_GPF6, val);            if (val == 0)            {                down(&leds_lock);                leds_status &= ~(1<<2);                up(&leds_lock);            }            else            {                down(&leds_lock);                leds_status |= (1<<2);                up(&leds_lock);            }            break;        }    }    return 1;}/* 这个结构是字符设备驱动程序的核心 * 当应用程序操作设备文件时所调用的open、read、write等函数， * 最终会调用这个结构中指定的对应函数 */static struct file_operations s3c24xx_leds_fops = {    .owner  =   THIS_MODULE,    /* 这是一个宏，推向编译模块时自动创建的__this_module变量 */    .open   =   s3c24xx_leds_open,    .read    =    s3c24xx_leds_read,    .write    =    s3c24xx_leds_write,};/* * 执行insmod命令时就会调用这个函数 */static int __init s3c24xx_leds_init(void)//static int __init init_module(void){    int ret;    int minor = 0;    gpio_va = ioremap(0x56000000, 0x100000);    if (!gpio_va) {        return -EIO;    }    printk(DEVICE_NAME "gpio_va = %x\n",gpio_va);    /* 注册字符设备     * 参数为主设备号、设备名字、file_operations结构；     * 这样，主设备号就和具体的file_operations结构联系起来了，     * 操作主设备为LED_MAJOR的设备文件时，就会调用s3c24xx_leds_fops中的相关成员函数     * LED_MAJOR可以设为0，表示由内核自动分配主设备号     */    ret = register_chrdev(LED_MAJOR, DEVICE_NAME, &s3c24xx_leds_fops);    if (ret < 0) {      printk(DEVICE_NAME " can‘t register major number\n");      return ret;    }//oo00 :begin : 分配了四个子设备号  minor == 0 1 2 3    leds_class = class_create(THIS_MODULE, "leds");    if (IS_ERR(leds_class))        return PTR_ERR(leds_class);    leds_class_devs[0] = class_device_create(leds_class, NULL, MKDEV(LED_MAJOR, 0), NULL, "leds");    for (minor = 1; minor < 4; minor++)    {        leds_class_devs[minor] = class_device_create(leds_class, NULL, MKDEV(LED_MAJOR, minor), NULL, "led%d", minor);        if (unlikely(IS_ERR(leds_class_devs[minor])))            return PTR_ERR(leds_class_devs[minor]);    }//oo00 :end    printk(DEVICE_NAME " initialized\n");    return 0;}/* * 执行rmmod命令时就会调用这个函数 */static void __exit s3c24xx_leds_exit(void){    int minor;    /* 卸载驱动程序 */    unregister_chrdev(LED_MAJOR, DEVICE_NAME);    for (minor = 0; minor < 4; minor++)    {        class_device_unregister(leds_class_devs[minor]);    }    class_destroy(leds_class);    iounmap(gpio_va);}/* 这两行指定驱动程序的初始化函数和卸载函数 */module_init(s3c24xx_leds_init);module_exit(s3c24xx_leds_exit);/* 描述驱动程序的一些信息，不是必须的 */MODULE_AUTHOR("http://www.100ask.net");MODULE_VERSION("0.1.0");MODULE_DESCRIPTION("S3C2410/S3C2440 LED Driver");MODULE_LICENSE("GPL");

#include <sys/types.h>#include <sys/stat.h>#include <fcntl.h>#include <stdio.h>/*  *  ledtest <dev> <on|off>  */void print_usage(char *file){    printf("Usage:\n");    printf("%s <dev> <on|off>\n",file);    printf("eg. \n");    printf("%s /dev/leds on\n", file);    printf("%s /dev/leds off\n", file);    printf("%s /dev/led1 on\n", file);    printf("%s /dev/led1 off\n", file);}int main(int argc, char **argv){    int fd;    char* filename;    char val;    if (argc != 3)    {        print_usage(argv[0]);        return 0;    }    filename = argv[1];    fd = open(filename, O_RDWR);    if (fd < 0)    {        printf("error, can‘t open %s\n", filename);        return 0;    }    if (!strcmp("on", argv[2]))    {        // 亮灯        val = 0;        write(fd, &val, 1);    }    else if (!strcmp("off", argv[2]))    {        // 灭灯        val = 1;        write(fd, &val, 1);    }    else    {        print_usage(argv[0]);        return 0;    }            return 0;}