2 * Copyright IBM Corp. 2004
4 * Tape class device support
6 * Author: Stefan Bader <shbader@de.ibm.com>
7 * Based on simple class device code by Greg K-H
10 #define KMSG_COMPONENT "tape"
11 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
13 #include <linux/slab.h>
15 #include "tape_class.h"
17 MODULE_AUTHOR("Stefan Bader <shbader@de.ibm.com>");
19 "Copyright IBM Corp. 2004 All Rights Reserved.\n"
22 MODULE_LICENSE("GPL");
24 static struct class *tape_class;
27 * Register a tape device and return a pointer to the cdev structure.
30 * The pointer to the struct device of the physical (base) device.
32 * The pointer to the drivers name for it's character devices.
34 * The intended major/minor number. The major number may be 0 to
35 * get a dynamic major number.
37 * The pointer to the drivers file operations for the tape device.
39 * The pointer to the name of the character device.
41 struct tape_class_device *register_tape_dev(
42 struct device * device,
44 const struct file_operations *fops,
48 struct tape_class_device * tcd;
52 tcd = kzalloc(sizeof(struct tape_class_device), GFP_KERNEL);
54 return ERR_PTR(-ENOMEM);
56 strncpy(tcd->device_name, device_name, TAPECLASS_NAME_LEN);
57 for (s = strchr(tcd->device_name, '/'); s; s = strchr(s, '/'))
59 strncpy(tcd->mode_name, mode_name, TAPECLASS_NAME_LEN);
60 for (s = strchr(tcd->mode_name, '/'); s; s = strchr(s, '/'))
63 tcd->char_device = cdev_alloc();
64 if (!tcd->char_device) {
69 tcd->char_device->owner = fops->owner;
70 tcd->char_device->ops = fops;
71 tcd->char_device->dev = dev;
73 rc = cdev_add(tcd->char_device, tcd->char_device->dev, 1);
77 tcd->class_device = device_create(tape_class, device,
78 tcd->char_device->dev, NULL,
79 "%s", tcd->device_name);
80 rc = IS_ERR(tcd->class_device) ? PTR_ERR(tcd->class_device) : 0;
83 rc = sysfs_create_link(
85 &tcd->class_device->kobj,
89 goto fail_with_class_device;
93 fail_with_class_device:
94 device_destroy(tape_class, tcd->char_device->dev);
97 cdev_del(tcd->char_device);
104 EXPORT_SYMBOL(register_tape_dev);
106 void unregister_tape_dev(struct device *device, struct tape_class_device *tcd)
108 if (tcd != NULL && !IS_ERR(tcd)) {
109 sysfs_remove_link(&device->kobj, tcd->mode_name);
110 device_destroy(tape_class, tcd->char_device->dev);
111 cdev_del(tcd->char_device);
115 EXPORT_SYMBOL(unregister_tape_dev);
118 static int __init tape_init(void)
120 tape_class = class_create(THIS_MODULE, "tape390");
125 static void __exit tape_exit(void)
127 class_destroy(tape_class);
131 postcore_initcall(tape_init);
132 module_exit(tape_exit);