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__ */