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linux uinput
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´Ó init ²¿·Ö˵Æð°É¡£
static const struct file_operations uinput_fops = {
    .owner        = THIS_MODULE,
    .open        = uinput_open,
    .release    = uinput_release,
    .read        = uinput_read,
    .write        = uinput_write,
    .poll        = uinput_poll,
    .unlocked_ioctl    = uinput_ioctl,
};
static struct miscdevice uinput_misc = {
    .fops        = &uinput_fops,
    .minor        = UINPUT_MINOR,
    .name        = UINPUT_NAME,
};
static int __init uinput_init(void)
{
    return misc_register(&uinput_misc);
}
Ê×ÏÈ˵˵ miscdevice, ºÜ·½±ãµÄ¶«Î÷£¬¶Ô device ×öÁ˼òµ¥µÄ°ü×°£¬
µ± misc_register µÄʱºò¾ÍÍê³ÉÁË É豸µÄ ×¢²á°²×°Ò»ÀàµÄ¶«¶«£¬ ²»ÓÃ×Ô¼ºÔÙ²ÙÐÄÁË¡£ÕæÊÇÀÁÈ˵ÄÉè¼Æ°¢¡£
ËùÓÐµÄ misc É豸¹«ÓÃͬһ¸öÖ÷É豸ºÅ£¬ÔÚ misc_init ÖУ¬
static int __init misc_init(void)
{
#ifdef CONFIG_PROC_FS
    struct proc_dir_entry *ent;
    ent = create_proc_entry("misc", 0, NULL);
    if (ent)
        ent->proc_fops = &misc_proc_fops;
#endif
    misc_class = class_create(THIS_MODULE, "misc");
    if (IS_ERR(misc_class))
        return PTR_ERR(misc_class);
    if (register_chrdev(MISC_MAJOR,"misc",&misc_fops)) {
        printk("unable to get major


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