led.c

基于ppc405eP平台的键盘驱动代码

/** ************************************************************************* ** 
 ** includes
 ** ************************************************************************* **/
#include <linux/init.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/config.h>
#include <linux/slab.h>
#include <linux/vmalloc.h>
#include <linux/ioctl.h>
#include <linux/major.h>
#include <linux/delay.h>
#include <asm/errno.h>
#include <asm/irq.h>
#include <asm/uaccess.h>
#include <asm/io.h>
#include <asm/delay.h>

#include "led.h"

#ifdef __KERNEL_2_6_X__
#include <linux/proc_fs.h>
#endif

volatile unsigned short * led_base;

static int led_open(struct inode* inode, struct file* filp)
{
#ifdef __KERNEL_2_4_X__
	MOD_INC_USE_COUNT;
#endif	
	printk("led driver is opened\n");
	return 0;
}

static int led_release(struct inode* inode, struct file* filp)
{
#ifdef __KERNEL_2_4_X__
	MOD_DEC_USE_COUNT;
#endif	
	printk("led driver is closed\n");
	return 0;
}

static int led_ioctl (struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg)
{	
	printk("led driver ioctl\n");
	return ret;
}

/* LED file operations */
static struct file_operations led_fops = {
	open:		led_open,
	ioctl:		led_ioctl,
	release:	led_release
};

int init_led(void)
{
	volatile int ret;

	printk("LED Driver Initialized...\n");   
	led_base = (volatile unsigned short *)ioremap(LED_PHY_ADDR, LED_MAP_SIZE);
	printk("init_led %p\n",led_base);
	ret = register_chrdev(LED_MAJOR, "led", &led_fops);
	if (ret < 0) {
		printk("init_led: led register failed\n");
		return ret;
	}

	return 0;
}

void exit_led(void)
{
	volatile int ret;

	ret = unregister_chrdev(LED_MAJOR, "led");
	if (ret < 0) {
		printk("exit_led: led unregister failed\n");
		return;
	}

	iounmap((void *)led_base);
   
	return;
}

module_init(init_led)
module_exit(exit_led)
#ifdef __KERNEL_2_6_X__
MODULE_LICENSE("Dual BSD/GPL");
#endif