2 * (C) Copyright IBM Corp. 2004
5 * Tape class device support
7 * Author: Stefan Bader <shbader@de.ibm.com>
8 * Based on simple class device code by Greg K-H
10 #include "tape_class.h"
12 MODULE_AUTHOR("Stefan Bader <shbader@de.ibm.com>");
14 "(C) Copyright IBM Corp. 2004 All Rights Reserved.\n"
17 MODULE_LICENSE("GPL");
19 static struct class *tape_class
;
22 * Register a tape device and return a pointer to the cdev structure.
25 * The pointer to the struct device of the physical (base) device.
27 * The pointer to the drivers name for it's character devices.
29 * The intended major/minor number. The major number may be 0 to
30 * get a dynamic major number.
32 * The pointer to the drivers file operations for the tape device.
34 * The pointer to the name of the character device.
36 struct tape_class_device
*register_tape_dev(
37 struct device
* device
,
39 const struct file_operations
*fops
,
43 struct tape_class_device
* tcd
;
47 tcd
= kzalloc(sizeof(struct tape_class_device
), GFP_KERNEL
);
49 return ERR_PTR(-ENOMEM
);
51 strncpy(tcd
->device_name
, device_name
, TAPECLASS_NAME_LEN
);
52 for (s
= strchr(tcd
->device_name
, '/'); s
; s
= strchr(s
, '/'))
54 strncpy(tcd
->mode_name
, mode_name
, TAPECLASS_NAME_LEN
);
55 for (s
= strchr(tcd
->mode_name
, '/'); s
; s
= strchr(s
, '/'))
58 tcd
->char_device
= cdev_alloc();
59 if (!tcd
->char_device
) {
64 tcd
->char_device
->owner
= fops
->owner
;
65 tcd
->char_device
->ops
= fops
;
66 tcd
->char_device
->dev
= dev
;
68 rc
= cdev_add(tcd
->char_device
, tcd
->char_device
->dev
, 1);
72 tcd
->class_device
= class_device_create(
75 tcd
->char_device
->dev
,
77 "%s", tcd
->device_name
79 rc
= IS_ERR(tcd
->class_device
) ? PTR_ERR(tcd
->class_device
) : 0;
82 rc
= sysfs_create_link(
84 &tcd
->class_device
->kobj
,
88 goto fail_with_class_device
;
92 fail_with_class_device
:
93 class_device_destroy(tape_class
, tcd
->char_device
->dev
);
96 cdev_del(tcd
->char_device
);
103 EXPORT_SYMBOL(register_tape_dev
);
105 void unregister_tape_dev(struct tape_class_device
*tcd
)
107 if (tcd
!= NULL
&& !IS_ERR(tcd
)) {
109 &tcd
->class_device
->dev
->kobj
,
112 class_device_destroy(tape_class
, tcd
->char_device
->dev
);
113 cdev_del(tcd
->char_device
);
117 EXPORT_SYMBOL(unregister_tape_dev
);
120 static int __init
tape_init(void)
122 tape_class
= class_create(THIS_MODULE
, "tape390");
127 static void __exit
tape_exit(void)
129 class_destroy(tape_class
);
133 postcore_initcall(tape_init
);
134 module_exit(tape_exit
);