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Diffstat (limited to 'drivers/s390/char/tape_class.c')
-rw-r--r--drivers/s390/char/tape_class.c126
1 files changed, 126 insertions, 0 deletions
diff --git a/drivers/s390/char/tape_class.c b/drivers/s390/char/tape_class.c
new file mode 100644
index 000000000000..0f8ffd4167ca
--- /dev/null
+++ b/drivers/s390/char/tape_class.c
@@ -0,0 +1,126 @@
1/*
2 * (C) Copyright IBM Corp. 2004
3 * tape_class.c ($Revision: 1.8 $)
4 *
5 * Tape class device support
6 *
7 * Author: Stefan Bader <shbader@de.ibm.com>
8 * Based on simple class device code by Greg K-H
9 */
10#include "tape_class.h"
11
12MODULE_AUTHOR("Stefan Bader <shbader@de.ibm.com>");
13MODULE_DESCRIPTION(
14 "(C) Copyright IBM Corp. 2004 All Rights Reserved.\n"
15 "tape_class.c ($Revision: 1.8 $)"
16);
17MODULE_LICENSE("GPL");
18
19struct class_simple *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 */
36struct tape_class_device *register_tape_dev(
37 struct device * device,
38 dev_t dev,
39 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 = kmalloc(sizeof(struct tape_class_device), GFP_KERNEL);
48 if (!tcd)
49 return ERR_PTR(-ENOMEM);
50
51 memset(tcd, 0, sizeof(struct tape_class_device));
52 strncpy(tcd->device_name, device_name, TAPECLASS_NAME_LEN);
53 for (s = strchr(tcd->device_name, '/'); s; s = strchr(s, '/'))
54 *s = '!';
55 strncpy(tcd->mode_name, mode_name, TAPECLASS_NAME_LEN);
56 for (s = strchr(tcd->mode_name, '/'); s; s = strchr(s, '/'))
57 *s = '!';
58
59 tcd->char_device = cdev_alloc();
60 if (!tcd->char_device) {
61 rc = -ENOMEM;
62 goto fail_with_tcd;
63 }
64
65 tcd->char_device->owner = fops->owner;
66 tcd->char_device->ops = fops;
67 tcd->char_device->dev = dev;
68
69 rc = cdev_add(tcd->char_device, tcd->char_device->dev, 1);
70 if (rc)
71 goto fail_with_cdev;
72
73 tcd->class_device = class_simple_device_add(
74 tape_class,
75 tcd->char_device->dev,
76 device,
77 "%s", tcd->device_name
78 );
79 sysfs_create_link(
80 &device->kobj,
81 &tcd->class_device->kobj,
82 tcd->mode_name
83 );
84
85 return tcd;
86
87fail_with_cdev:
88 cdev_del(tcd->char_device);
89
90fail_with_tcd:
91 kfree(tcd);
92
93 return ERR_PTR(rc);
94}
95EXPORT_SYMBOL(register_tape_dev);
96
97void unregister_tape_dev(struct tape_class_device *tcd)
98{
99 if (tcd != NULL && !IS_ERR(tcd)) {
100 sysfs_remove_link(
101 &tcd->class_device->dev->kobj,
102 tcd->mode_name
103 );
104 class_simple_device_remove(tcd->char_device->dev);
105 cdev_del(tcd->char_device);
106 kfree(tcd);
107 }
108}
109EXPORT_SYMBOL(unregister_tape_dev);
110
111
112static int __init tape_init(void)
113{
114 tape_class = class_simple_create(THIS_MODULE, "tape390");
115
116 return 0;
117}
118
119static void __exit tape_exit(void)
120{
121 class_simple_destroy(tape_class);
122 tape_class = NULL;
123}
124
125postcore_initcall(tape_init);
126module_exit(tape_exit);