mouse.c

LINUX1.0内核源代码,学习LINUX编程的一定要看。

/*
 * linux/kernel/chr_drv/mouse.c
 *
 * Generic mouse open routine by Johan Myreen
 *
 * Based on code from Linus
 *
 * Teemu Rantanen's Microsoft Busmouse support and Derrick Cole's
 *   changes incorporated into 0.97pl4
 *   by Peter Cervasio ([e-mail]) (08SEP92)
 *   See busmouse.c for particulars.
 *
 * Made things a lot mode modular - easy to compile in just one or two
 * of the mouse drivers, as they are now completely independent. Linus.
 */

#include <linux/fs.h>
#include <linux/errno.h>
#include <linux/mouse.h>
#include <linux/config.h>
#include <linux/kernel.h>
#include <linux/major.h>

/*
 * note that you can remove any or all of the drivers by undefining
 * the minor values in <linux/mouse.h>
 */
extern struct file_operations bus_mouse_fops;
extern struct file_operations psaux_fops;
extern struct file_operations ms_bus_mouse_fops;
extern struct file_operations atixl_busmouse_fops;

extern unsigned long bus_mouse_init(unsigned long);
extern unsigned long psaux_init(unsigned long);
extern unsigned long ms_bus_mouse_init(unsigned long);
extern unsigned long atixl_busmouse_init(unsigned long);

static int mouse_open(struct inode * inode, struct file * file)
{
	int minor = MINOR(inode->i_rdev);

	switch (minor) {
#ifdef CONFIG_BUSMOUSE
		case BUSMOUSE_MINOR:
	                file->f_op = &bus_mouse_fops;
	                break;
#endif
#if defined CONFIG_PSMOUSE || defined CONFIG_82C710_MOUSE
		case PSMOUSE_MINOR:
	                file->f_op = &psaux_fops;
	                break;
#endif
#ifdef CONFIG_MS_BUSMOUSE
		case MS_BUSMOUSE_MINOR:
		        file->f_op = &ms_bus_mouse_fops;
		        break;
#endif
#ifdef CONFIG_ATIXL_BUSMOUSE
		case ATIXL_BUSMOUSE_MINOR:
			file->f_op = &atixl_busmouse_fops;
			break;
#endif
		default:
			return -ENODEV;
	}
        return file->f_op->open(inode,file);
}

static struct file_operations mouse_fops = {
        NULL,		/* seek */
	NULL,		/* read */
	NULL,		/* write */
	NULL,		/* readdir */
	NULL,		/* select */
	NULL,		/* ioctl */
	NULL,		/* mmap */
        mouse_open,
        NULL		/* release */
};

unsigned long mouse_init(unsigned long kmem_start)
{
#ifdef CONFIG_BUSMOUSE
	kmem_start = bus_mouse_init(kmem_start);
#endif
#if defined CONFIG_PSMOUSE || defined CONFIG_82C710_MOUSE
	kmem_start = psaux_init(kmem_start);
#endif
#ifdef CONFIG_MS_BUSMOUSE
	kmem_start = ms_bus_mouse_init(kmem_start);
#endif
#ifdef CONFIG_ATIXL_BUSMOUSE
 	kmem_start = atixl_busmouse_init(kmem_start);
#endif
	if (register_chrdev(MOUSE_MAJOR,"mouse",&mouse_fops))
		printk("unable to get major %d for mouse devices\n",
		       MOUSE_MAJOR);
	return kmem_start;
}