#include <linux/module.h>#include <linux/moduleloader.h>#include <linux/kernel.h>#include <linux/mm.h>#include <linux/elf.h>#include <linux/vmalloc.h>#include <linux/fs.h>#include <linux/string.h>#include <linux/gfp.h>#include <asm/pgtable.h>#include <asm/sections.h>#include <asm/unwind.h>#include <linux/init.h>#include <asm/io.h>//arch/arm/include/asm/io.h#include <linux/ioport.h>#include <linux/types.h>#include <linux/cdev.h>#include <asm/uaccess.h>#include <linux/device.h>#define key_paddr 0xE0200C40#define led_paddr 0xE0200280unsigned long *key_ctrl_vaddr=NULL;unsigned long *key_data_vaddr=NULL;unsigned long *led_ctrl_vaddr=NULL;unsigned long *led_data_vaddr=NULL;static unsigned int this_major = 250;static unsigned int this_minor = 0;struct class *key_led_class;static int key_led_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long args){    unsigned int val;        switch(cmd)    {        printk("%d-%d\n",cmd,args);        //led on        case 0:               val = ioread32(led_data_vaddr);            val &=~(0x1<<args);                        iowrite32(val,led_data_vaddr);            break;        case 1:            val = ioread32(led_data_vaddr);            val |=(0x1<<args);            iowrite32(val,led_data_vaddr);            break;        default:            printk("cmd is wrong, 0-->LED OFF  1-->LED ON \n");                return -EINVAL;    }    return 0;}static int key_led_open (struct inode *inode, struct file *file){    printk("open!\n");    return 0;}static int key_led_release (struct inode *inode, struct file *file){    printk("release!\n");    return 0;}struct file_operations key_led_fops={    .owner = THIS_MODULE,    .open = key_led_open,    .release = key_led_release,    .ioctl = key_led_ioctl,};static __init int key_led_init(void){    printk("key_led_init!\n");    int result;    result = register_chrdev(this_major, "key_led", &key_led_fops);    if(result<0)    {        printk("register_chrdev error!\n");        goto register_chrdev_error;    }    key_led_class = class_create(THIS_MODULE, "key_led");    if(IS_ERR(key_led_class))    {        printk("Err:failed in creating class.\n");        goto class_create_error;    }        if(device_create(key_led_class,NULL,MKDEV(this_major, this_minor), NULL, "key_led")==NULL)    {        printk("device_create_error!\n");        goto device_create_error;    }        struct resource *resource;    resource=request_mem_region(key_paddr, 8, "key_men");    if(resource==NULL)    {        printk("request_mem_region_error!\n");        goto request_mem_region;    }    resource=request_mem_region(led_paddr, 8, "led men");    if(resource==NULL)    {        printk("request_mem_region_error!\n");        goto request_mem_region;    }    key_ctrl_vaddr = ioremap(key_paddr, 8);    key_data_vaddr = key_ctrl_vaddr+1;        led_ctrl_vaddr = ioremap(led_paddr, 8);    led_data_vaddr = led_ctrl_vaddr+1;    if(key_ctrl_vaddr==NULL ||led_ctrl_vaddr ==NULL)    {        printk("ioremap_error!\n");        goto ioremap_error;    }    //key_ctrl,input method    unsigned int val;    val = ioread32(key_ctrl_vaddr);    val &= ~(0xf<<0);    iowrite32(val,key_ctrl_vaddr);    //led_ctrl,output method    val = ioread32(led_ctrl_vaddr);    val &=~(0xf<<0);    val |= (0x1<<0);    iowrite32(val,led_ctrl_vaddr);    //led_data    val = ioread32(led_data_vaddr);    val |=(0x1<<0);    iowrite32(val,led_data_vaddr);        return 0;    ioremap_error:    release_mem_region(key_paddr, 8);    release_mem_region(led_paddr, 8);request_mem_region:    device_destroy(key_led_class, MKDEV(this_major, this_minor));device_create_error:    class_destroy(key_led_class);class_create_error:    unregister_chrdev(this_major,"key_led");register_chrdev_error:    return -1;}static __exit void key_led_exit(void){    printk("key_led_exit!\n");    unsigned int val;    val = ioread32(led_data_vaddr);    val |= (0x1<<0);    iowrite32(val,led_data_vaddr);    iounmap(key_ctrl_vaddr);    iounmap(led_ctrl_vaddr);    release_mem_region(key_paddr, 8);    release_mem_region(led_paddr, 8);    device_destroy(key_led_class, MKDEV(this_major, this_minor));    class_destroy(key_led_class);    unregister_chrdev(this_major,"key_led");}module_init(key_led_init);module_exit(key_led_exit);MODULE_LICENSE("GPL");MODULE_AUTHOR("Achilles");

#include <stdio.h>#include <sys/types.h>#include <sys/stat.h>#include <sys/fcntl.h>int on ;int ledn;int main(int argc,char** argv){    printf("app!\n");    if(argc > 3|| sscanf(argv[2], "%d",&ledn)!=1||sscanf(argv[1],"%d",&on)!=1)    {        printf("error: format: ./app on ledn\n");        return -1;    }    int fd = open("/dev/key_led",O_RDWR);        printf("%d-%d\n",on,ledn);    ioctl(fd, ledn, on);        close(fd);    return 0;}

obj-m = module_key_led.oKDIR = ~/kernel_srcall:    cp ~/share/*.c .    make -C $(KDIR) M=`pwd` modules    arm-linux-gcc app.c -o app    cp *.ko ~/share    cp app ~/shareclean:    make -C $(KDIR) M=`pwd` modules clean