kbuild: use POSIX BRE in headers install target
[wrt350n-kernel.git] / drivers / s390 / char / tape_class.c
blob2e0d29730b67590639f8e0dba84b48ae90ebd5b5
1 /*
2 * (C) Copyright IBM Corp. 2004
3 * tape_class.c
5 * Tape class device support
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"
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"
17 MODULE_LICENSE("GPL");
19 static struct class *tape_class;
22 * Register a tape device and return a pointer to the cdev structure.
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.
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)
43 struct tape_class_device * tcd;
44 int rc;
45 char * s;
47 tcd = kzalloc(sizeof(struct tape_class_device), GFP_KERNEL);
48 if (!tcd)
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, '/'))
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 = '!';
58 tcd->char_device = cdev_alloc();
59 if (!tcd->char_device) {
60 rc = -ENOMEM;
61 goto fail_with_tcd;
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);
69 if (rc)
70 goto fail_with_cdev;
72 tcd->class_device = class_device_create(
73 tape_class,
74 NULL,
75 tcd->char_device->dev,
76 device,
77 "%s", tcd->device_name
79 rc = IS_ERR(tcd->class_device) ? PTR_ERR(tcd->class_device) : 0;
80 if (rc)
81 goto fail_with_cdev;
82 rc = sysfs_create_link(
83 &device->kobj,
84 &tcd->class_device->kobj,
85 tcd->mode_name
87 if (rc)
88 goto fail_with_class_device;
90 return tcd;
92 fail_with_class_device:
93 class_device_destroy(tape_class, tcd->char_device->dev);
95 fail_with_cdev:
96 cdev_del(tcd->char_device);
98 fail_with_tcd:
99 kfree(tcd);
101 return ERR_PTR(rc);
103 EXPORT_SYMBOL(register_tape_dev);
105 void unregister_tape_dev(struct tape_class_device *tcd)
107 if (tcd != NULL && !IS_ERR(tcd)) {
108 sysfs_remove_link(
109 &tcd->class_device->dev->kobj,
110 tcd->mode_name
112 class_device_destroy(tape_class, tcd->char_device->dev);
113 cdev_del(tcd->char_device);
114 kfree(tcd);
117 EXPORT_SYMBOL(unregister_tape_dev);
120 static int __init tape_init(void)
122 tape_class = class_create(THIS_MODULE, "tape390");
124 return 0;
127 static void __exit tape_exit(void)
129 class_destroy(tape_class);
130 tape_class = NULL;
133 postcore_initcall(tape_init);
134 module_exit(tape_exit);