fbmem.c 分析1

fbmem.c 分析1

/**
 *      fbmem_init - init frame buffer subsystem
 *
 *      Initialize the frame buffer subsystem.
 *
 *      NOTE: This function is _only_ to be called by drivers/char/mem.c.
 *
 */


static int __init  fbmem_init(void)
{
        proc_create("fb", 0, NULL, &fb_proc_fops);       //建立proc檔案

        if (register_chrdev(FB_MAJOR,"fb",&fb_fops))     //注冊fb字元裝置 
                printk("unable to get major %d for fb devs\n", FB_MAJOR);

        fb_class = class_create(THIS_MODULE, "graphics");   //在/sys/class/下建立類目錄
        if (IS_ERR(fb_class)) {
                printk(KERN_WARNING "Unable to create fb class; errno = %ld\n", PTR_ERR(fb_class));
                fb_class = NULL;
        }
        return 0;
}