用ioctl传入命令控制LED（需要自己建立节点）
驱动程序
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/fs.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/poll.h>
#include <linux/irq.h>
#include <asm/irq.h>
#include <linux/interrupt.h>
#include <asm/uaccess.h>
#include <mach/regs-gpio.h>
#include <mach/hardware.h>
#include <linux/platform_device.h>
#include <linux/cdev.h>
#include <linux/miscdevice.h>
#include <linux/mm.h>
#include <asm/io.h> //ioremap()
/* 定义幻数 */
#define MEMDEV_IOC_MAGIC 'k'
/* 定义命令 */
#define LED_ON_1 _IOR(MEMDEV_IOC_MAGIC,1,int) //读
#define LED_ON_2 _IOR(MEMDEV_IOC_MAGIC,2,int)
#define LED_ON_3 _IOW(MEMDEV_IOC_MAGIC,3,int) //写
#define LED_ON_4 _IOW(MEMDEV_IOC_MAGIC,4,int)
#define MEMDEV_IOC_MAXNR 4
volatile unsigned long *gpbcon = (void *)0; //LED
volatile unsigned long *gpbdat = (void *)0;
//////////////////////////////////////////////////////////////////
/*IO操作*/
int ioctl_led_ioctl(struct inode *inode, struct file *filp,unsigned int cmd, unsigned long arg)
{
int ret = 0;
int ioarg = 0;
/* 根据命令，执行相应的操作 */
switch(cmd) {
case LED_ON_1:
printk("The CMD LED_ON_1 ---===>>>\n");
ret = __get_user(ioarg, (int *)arg);
if(ioarg == 0x01)
{
*gpbdat &= ~(1<<5);
printk("you input CMD that Light the LED \n");
}
else if(ioarg == 0x81)
{
*gpbdat |= (1<<5);
printk("you input CMD that UNlight the LED \n");
}
else
{
printk("Wrong CMD \n");
}
break;
case LED_ON_2:
printk("The CMD LED_ON_2 ---===>>> \n");
ret = __get_user(ioarg, (int *)arg);
if(ioarg == 0x02)
{
*gpbdat &= ~(1<<6);
printk("you input CMD that Light the LED \n");
}
else if(ioarg == 0x82)
{
*gpbdat |= (1<<6);
printk("you input CMD that UNlight the LED \n");
}
else
{
printk("Wrong CMD \n");
}
break;
case LED_ON_3:
printk("The CMD LED_ON_4 \n");
printk("The third LED on !!! output the number 666 !!!\n");
ioarg = 666;
ret = __put_user(ioarg, (int *)arg);
*gpbdat &= ~(1<<7);
break;
case LED_ON_4:
printk("The CMD LED_ON_4 \n");
printk("The forth LED on !!! output the number 888 !!!\n");
ioarg = 888;
ret = __put_user(ioarg, (int *)arg);
*gpbdat &= ~(1<<8);
break;
default:
return -EINVAL;
}
return ret;
}
static int ioctl_led_open(struct inode *inode, struct file *file)
{
*gpbdat |= ((1<<5) | (1<<6) | (1<<7) | (1<<8)); //LED全灭
return 0;
}
static struct file_operations led_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 = ioctl_led_open,
.ioctl = ioctl_led_ioctl,
};
int major; //主设备号
static int ioctl_led_init(void)
{
major = register_chrdev(0, "myled", &led_fops);
gpbcon = (volatile unsigned long *)ioremap(0x56000010, 16);
gpbdat = gpbcon + 1;
return 0;
}
static void ioctl_led_exit(void)
{
unregister_chrdev(major, "myled");
iounmap(gpbcon);
}
module_init(ioctl_led_init);
module_exit(ioctl_led_exit);
MODULE_LICENSE("GPL");
测试程序
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stdio.h>
#include <linux/ioctl.h>
/* 定义幻数 */
#define MEMDEV_IOC_MAGIC 'k'
/* 定义命令 */
#define LED_ON_1 _IOR(MEMDEV_IOC_MAGIC,1,int) //读
#define LED_ON_2 _IOR(MEMDEV_IOC_MAGIC,2,int)
#define LED_ON_3 _IOW(MEMDEV_IOC_MAGIC,3,int) //写
#define LED_ON_4 _IOW(MEMDEV_IOC_MAGIC,4,int)
#define MEMDEV_IOC_MAXNR 4
static int input[4] = {{"cmd1"},{"cmd2"},{"cmd3"},{"cmd4"}};
int main(int argc,char **argv)
{
int fd = 0;
int cmd;
int input_flag = 0;
int arg = 0;
unsigned char key_val;
/*打开设备文件*/
fd = open("/dev/ioctlled",O_RDWR); //ioctlled 在 /dev/ 下可以看见是这个名字
if (fd < 0)
{
printf("Open Dev Mem0 Error!\n");
return -1;
}
//while(1)
//{
if (strcmp(*input, argv[1]) == 0)
{
input_flag = 1;
}
else if (strcmp(*(input+1), argv[1]) == 0)
{
input_flag = 2;
}
else if (strcmp(*(input+2), argv[1]) == 0)
{
input_flag = 3;
}
else if (strcmp(*(input+3), argv[1]) == 0)
{
input_flag = 4;
}
else
{
printf("Wrong CMD ---===>>> \n");
}
switch(input_flag)
{
case 0x01: //judge the "input_flag"
cmd = LED_ON_1;
arg = 0x01; //write "arg" to driver
if (ioctl(fd, cmd, &arg) < 0)
{
printf("Call cmd MEMDEV_IOCPRINT fail\n");
return -1;
}
break;
case 0x02:
cmd = LED_ON_2;
arg = 0x02;
if (ioctl(fd, cmd, &arg) < 0)
{
printf("Call cmd MEMDEV_IOCSETDATA fail\n");
return -1;
}
break;
case 0x03:
cmd = LED_ON_3;
if (ioctl(fd, cmd, &arg) < 0)
{
printf("Call cmd MEMDEV_IOCGETDATA fail\n");
return -1;
}
printf("we received number %d from kernel \n",arg);
break;
case 0x04:
cmd = LED_ON_4;
if (ioctl(fd, cmd, &arg) < 0)
{
printf("Call cmd MEMDEV_IOCGETDATA fail\n");
return -1;
}
printf("we received number %d from kernel \n",arg);
break;
}
//}
close(fd);
return 0;
}
运行结果
[root@EmbedSky huayang]# insmod ioctlled.ko
Loaded Modle 这是打印出的一句话
[root@EmbedSky huayang]#
[root@EmbedSky huayang]# cat /proc/devices
Character devices:
1 mem
4 /dev/vc/0
4 tty
5 /dev/tty
5 /dev/console
5 /dev/ptmx
7 vcs
10 misc
13 input
14 sound
29 fb
81 video4linux
89 i2c
90 mtd
116 alsa
128 ptm
136 pts
180 usb
188 ttyUSB
189 usb_device
204 tq2440_serial
252 myled 这是我们安装的模块 它的主设备号是252
253 usb_endpoint
254 rtc
创建设备节点并查看一下
[root@EmbedSky huayang]# mknod /dev/ioctlled c 252 0
[root@EmbedSky huayang]# ls /dev/ioctlled
/dev/ioctlled
[root@EmbedSky huayang]#
测试它
[root@EmbedSky huayang]# ioctlledtest cmd1
The CMD LED_ON_1 ---===>>>
you input CMD that Light the LED 这是打印出的信息
[root@EmbedSky huayang]#
谢谢支持！！！