xref: /linux/drivers/s390/char/tape_class.h (revision 498495dba268b20e8eadd7fe93c140c68b6cc9d2)
1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3  * Copyright IBM Corp. 2004   All Rights Reserved.
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/cdev.h>
18 
19 #include <linux/device.h>
20 #include <linux/kdev_t.h>
21 
22 #define TAPECLASS_NAME_LEN	32
23 
24 struct tape_class_device {
25 	struct cdev		*char_device;
26 	struct device		*class_device;
27 	char			device_name[TAPECLASS_NAME_LEN];
28 	char			mode_name[TAPECLASS_NAME_LEN];
29 };
30 
31 /*
32  * Register a tape device and return a pointer to the tape class device
33  * created by the call.
34  *
35  * device
36  *	The pointer to the struct device of the physical (base) device.
37  * dev
38  *	The intended major/minor number. The major number may be 0 to
39  *	get a dynamic major number.
40  * fops
41  *	The pointer to the drivers file operations for the tape device.
42  * device_name
43  *	Pointer to the logical device name (will also be used as kobject name
44  *	of the cdev). This can also be called the name of the tape class
45  *	device.
46  * mode_name
47  *	Points to the name of the tape mode. This creates a link with that
48  *	name from the physical device to the logical device (class).
49  */
50 struct tape_class_device *register_tape_dev(
51 	struct device *		device,
52 	dev_t			dev,
53 	const struct file_operations *fops,
54 	char *			device_name,
55 	char *			node_name
56 );
57 void unregister_tape_dev(struct device *device, struct tape_class_device *tcd);
58 
59 #endif /* __TAPE_CLASS_H__ */
60