[S390] Cleanup 3215 printk messages.
[linux-2.6] / drivers / s390 / char / tape_class.c
1 /*
2  * (C) Copyright IBM Corp. 2004
3  * tape_class.c
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 #include "tape_class.h"
11
12 MODULE_AUTHOR("Stefan Bader <shbader@de.ibm.com>");
13 MODULE_DESCRIPTION(
14         "(C) Copyright IBM Corp. 2004   All Rights Reserved.\n"
15         "tape_class.c"
16 );
17 MODULE_LICENSE("GPL");
18
19 static struct class *tape_class;
20
21 /*
22  * Register a tape device and return a pointer to the cdev structure.
23  *
24  * device
25  *      The pointer to the struct device of the physical (base) device.
26  * drivername
27  *      The pointer to the drivers name for it's character devices.
28  * dev
29  *      The intended major/minor number. The major number may be 0 to
30  *      get a dynamic major number.
31  * fops
32  *      The pointer to the drivers file operations for the tape device.
33  * devname
34  *      The pointer to the name of the character device.
35  */
36 struct tape_class_device *register_tape_dev(
37         struct device *         device,
38         dev_t                   dev,
39         const struct file_operations *fops,
40         char *                  device_name,
41         char *                  mode_name)
42 {
43         struct tape_class_device *      tcd;
44         int             rc;
45         char *          s;
46
47         tcd = kzalloc(sizeof(struct tape_class_device), GFP_KERNEL);
48         if (!tcd)
49                 return ERR_PTR(-ENOMEM);
50
51         strncpy(tcd->device_name, device_name, TAPECLASS_NAME_LEN);
52         for (s = strchr(tcd->device_name, '/'); s; s = strchr(s, '/'))
53                 *s = '!';
54         strncpy(tcd->mode_name, mode_name, TAPECLASS_NAME_LEN);
55         for (s = strchr(tcd->mode_name, '/'); s; s = strchr(s, '/'))
56                 *s = '!';
57
58         tcd->char_device = cdev_alloc();
59         if (!tcd->char_device) {
60                 rc = -ENOMEM;
61                 goto fail_with_tcd;
62         }
63
64         tcd->char_device->owner = fops->owner;
65         tcd->char_device->ops   = fops;
66         tcd->char_device->dev   = dev;
67
68         rc = cdev_add(tcd->char_device, tcd->char_device->dev, 1);
69         if (rc)
70                 goto fail_with_cdev;
71
72         tcd->class_device = device_create(tape_class, device,
73                                           tcd->char_device->dev,
74                                           "%s", tcd->device_name
75                         );
76         rc = IS_ERR(tcd->class_device) ? PTR_ERR(tcd->class_device) : 0;
77         if (rc)
78                 goto fail_with_cdev;
79         rc = sysfs_create_link(
80                 &device->kobj,
81                 &tcd->class_device->kobj,
82                 tcd->mode_name
83         );
84         if (rc)
85                 goto fail_with_class_device;
86
87         return tcd;
88
89 fail_with_class_device:
90         device_destroy(tape_class, tcd->char_device->dev);
91
92 fail_with_cdev:
93         cdev_del(tcd->char_device);
94
95 fail_with_tcd:
96         kfree(tcd);
97
98         return ERR_PTR(rc);
99 }
100 EXPORT_SYMBOL(register_tape_dev);
101
102 void unregister_tape_dev(struct device *device, struct tape_class_device *tcd)
103 {
104         if (tcd != NULL && !IS_ERR(tcd)) {
105                 sysfs_remove_link(&device->kobj, tcd->mode_name);
106                 device_destroy(tape_class, tcd->char_device->dev);
107                 cdev_del(tcd->char_device);
108                 kfree(tcd);
109         }
110 }
111 EXPORT_SYMBOL(unregister_tape_dev);
112
113
114 static int __init tape_init(void)
115 {
116         tape_class = class_create(THIS_MODULE, "tape390");
117
118         return 0;
119 }
120
121 static void __exit tape_exit(void)
122 {
123         class_destroy(tape_class);
124         tape_class = NULL;
125 }
126
127 postcore_initcall(tape_init);
128 module_exit(tape_exit);