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 | |