/drivers/s390/char/tape_class.h

 1/*
 2 * (C) Copyright IBM Corp. 2004   All Rights Reserved.
 3 * tape_class.h
 4 *
 5 * Tape class device support
 6 *
 7 * Author: Stefan Bader <shbader@de.ibm.com>
 8 * Based on simple class device code by Greg K-H
 9 */
10#ifndef __TAPE_CLASS_H__
11#define __TAPE_CLASS_H__
12
13#include <linux/init.h>
14#include <linux/module.h>
15#include <linux/fs.h>
16#include <linux/major.h>
17#include <linux/kobj_map.h>
18#include <linux/cdev.h>
19
20#include <linux/device.h>
21#include <linux/kdev_t.h>
22
23#define TAPECLASS_NAME_LEN	32
24
25struct tape_class_device {
26	struct cdev		*char_device;
27	struct device		*class_device;
28	char			device_name[TAPECLASS_NAME_LEN];
29	char			mode_name[TAPECLASS_NAME_LEN];
30};
31
32/*
33 * Register a tape device and return a pointer to the tape class device
34 * created by the call.
35 *
36 * device
37 *	The pointer to the struct device of the physical (base) device.
38 * dev
39 *	The intended major/minor number. The major number may be 0 to
40 *	get a dynamic major number.
41 * fops
42 *	The pointer to the drivers file operations for the tape device.
43 * device_name
44 *	Pointer to the logical device name (will also be used as kobject name
45 *	of the cdev). This can also be called the name of the tape class
46 *	device.
47 * mode_name
48 *	Points to the name of the tape mode. This creates a link with that
49 *	name from the physical device to the logical device (class).
50 */
51struct tape_class_device *register_tape_dev(
52	struct device *		device,
53	dev_t			dev,
54	const struct file_operations *fops,
55	char *			device_name,
56	char *			node_name
57);
58void unregister_tape_dev(struct device *device, struct tape_class_device *tcd);
59
60#endif /* __TAPE_CLASS_H__ */