xref: /linux/drivers/s390/char/tape_class.h (revision f3d9478b2ce468c3115b02ecae7e975990697f15)
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/kobject.h>
18 #include <linux/kobj_map.h>
19 #include <linux/cdev.h>
20 
21 #include <linux/device.h>
22 #include <linux/kdev_t.h>
23 
24 #define TAPECLASS_NAME_LEN	32
25 
26 struct tape_class_device {
27 	struct cdev *		char_device;
28 	struct class_device *	class_device;
29 	char			device_name[TAPECLASS_NAME_LEN];
30 	char			mode_name[TAPECLASS_NAME_LEN];
31 };
32 
33 /*
34  * Register a tape device and return a pointer to the tape class device
35  * created by the call.
36  *
37  * device
38  *	The pointer to the struct device of the physical (base) device.
39  * dev
40  *	The intended major/minor number. The major number may be 0 to
41  *	get a dynamic major number.
42  * fops
43  *	The pointer to the drivers file operations for the tape device.
44  * device_name
45  *	Pointer to the logical device name (will also be used as kobject name
46  *	of the cdev). This can also be called the name of the tape class
47  *	device.
48  * mode_name
49  *	Points to the name of the tape mode. This creates a link with that
50  *	name from the physical device to the logical device (class).
51  */
52 struct tape_class_device *register_tape_dev(
53 	struct device *		device,
54 	dev_t			dev,
55 	struct file_operations *fops,
56 	char *			device_name,
57 	char *			node_name
58 );
59 void unregister_tape_dev(struct tape_class_device *tcd);
60 
61 #endif /* __TAPE_CLASS_H__ */
62