dev_gpio.h

利用开发板上的/dev/mem设备,进行内存映射,驱动cpu的GPIO口,点亮和熄灭led灯.附makefile文件

#include <linux/fs.h>
#include <linux/iobuf.h>
#include <linux/major.h>
#include <linux/blkdev.h>
#include <linux/capability.h>
#include <linux/smp_lock.h>
#include <asm/uaccess.h>

#include <asm/io.h>
#include <linux/vmalloc.h>

#define dprintk(x...)
#define IOPORT_MAJOR 220

typedef char ioport_device_t;

int gpio_open(struct inode *, struct file *);
int gpio_release(struct inode *, struct file *);
int gpio_ctl_ioctl(struct inode *, struct file *, unsigned int, unsigned long);
static struct file_operations gpio_fops =
{
	open: gpio_open,
	release: gpio_release,
};
static struct file_operations gpio_ctl_fops =
{
	ioctl: gpio_ctl_ioctl,
	open: gpio_open,
	release: gpio_release,
};