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
11 #define KMSG_COMPONENT "tape"
12 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
14 #include "tape_class.h"
16 MODULE_AUTHOR("Stefan Bader <shbader@de.ibm.com>");
18 "(C) Copyright IBM Corp. 2004 All Rights Reserved.\n"
21 MODULE_LICENSE("GPL");
23 static struct class *tape_class;
26 * Register a tape device and return a pointer to the cdev structure.
29 * The pointer to the struct device of the physical (base) device.
31 * The pointer to the drivers name for it's character devices.
33 * The intended major/minor number. The major number may be 0 to
34 * get a dynamic major number.
36 * The pointer to the drivers file operations for the tape device.
38 * The pointer to the name of the character device.
40 struct tape_class_device *register_tape_dev(
41 struct device * device,
43 const struct file_operations *fops,
47 struct tape_class_device * tcd;
51 tcd = kzalloc(sizeof(struct tape_class_device), GFP_KERNEL);
53 return ERR_PTR(-ENOMEM);
55 strncpy(tcd->device_name, device_name, TAPECLASS_NAME_LEN);
56 for (s = strchr(tcd->device_name, '/'); s; s = strchr(s, '/'))
58 strncpy(tcd->mode_name, mode_name, TAPECLASS_NAME_LEN);
59 for (s = strchr(tcd->mode_name, '/'); s; s = strchr(s, '/'))
62 tcd->char_device = cdev_alloc();
63 if (!tcd->char_device) {
68 tcd->char_device->owner = fops->owner;
69 tcd->char_device->ops = fops;
70 tcd->char_device->dev = dev;
72 rc = cdev_add(tcd->char_device, tcd->char_device->dev, 1);
76 tcd->class_device = device_create(tape_class, device,
77 tcd->char_device->dev, NULL,
78 "%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 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 device *device, struct tape_class_device *tcd)
107 if (tcd != NULL && !IS_ERR(tcd)) {
108 sysfs_remove_link(&device->kobj, tcd->mode_name);
109 device_destroy(tape_class, tcd->char_device->dev);
110 cdev_del(tcd->char_device);
114 EXPORT_SYMBOL(unregister_tape_dev);
117 static int __init tape_init(void)
119 tape_class = class_create(THIS_MODULE, "tape390");
124 static void __exit tape_exit(void)
126 class_destroy(tape_class);
130 postcore_initcall(tape_init);
131 module_exit(tape_exit);