深入浅出Linux设备驱动编程－－复杂设备驱动
作者 佚名技术
来源 Linux系统
浏览
发布时间 2012-05-16
| kb == NULL) { PDEBUG("tint for %p, tbusy %ld, skb %pn", dev, dev->tbusy, skb); snull_tx_timeout (dev); if (skb == NULL) return 0; } #endif len = skb->len < ETH_ZLEN ? ETH_ZLEN : skb->len; data = skb->data; dev->trans_start = jiffies; /* save the timestamp */ /* Remember the skb, so we can free it at interrupt time */ priv->skb = skb; /* actual deliver of data is device-specific, and not shown here */ snull_hw_tx(data, len, dev); return 0; /* Our simple device can not fail */ } /* MTD_BLOCK_MAJOR); return -EAGAIN; } devfs_dir_handle = devfs_mk_dir(NULL, DEVICE_NAME, NULL); register_mtd_user(¬ifier); #else if (register_blkdev(MAJOR_NR,DEVICE_NAME,&mtd_fops)) { printk(KERN_NOTICE "Can''t allocate major number %d for Memory Technology Devices.n", MTD_BLOCK_MAJOR); return -EAGAIN; } #endif /* We fill it in at open() time. */ for (i=0; i< MAX_MTD_DEVICES; i ) { mtd_sizes[i] = 0; mtd_blksizes[i] = BLOCK_SIZE; } init_waitqueue_head(&thr_wq); /* Allow the block size to default to BLOCK_SIZE. */ blksize_size[MAJOR_NR] = mtd_blksizes; blk_size[MAJOR_NR] = mtd_sizes; BLK_INIT_QUEUE(BLK_DEFAULT_QUEUE(MAJOR_NR), &mtdblock_request, &mtdblock_lock); kernel_thread (mtdblock_thread, NULL, CLONE_FS|CLONE_FILES|CLONE_SIGHAND); return 0; } static void __exit cleanup_mtdblock(void) { leaving = 1; wake_up(&thr_wq); down(&thread_sem); #ifdef CONFIG_DEVFS_FS unregister_mtd_user(¬ifier); devfs_unregister(devfs_dir_handle); devfs_unregister_blkdev(MTD_BLOCK_MAJOR, DEVICE_NAME); #else unregister_blkdev(MAJOR_NR,DEVICE_NAME); #endif blk_cleanup_queue(BLK_DEFAULT_QUEUE(MAJOR_NR)); blksize_size[MAJOR_NR] = NULL; blk_size[MAJOR_NR] = NULL; } |
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