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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
11#define KMSG_COMPONENT "tape"
12#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
13
14#include <linux/slab.h>
15
16#include "tape_class.h"
17
18MODULE_AUTHOR("Stefan Bader <shbader@de.ibm.com>");
19MODULE_DESCRIPTION(
20 "(C) Copyright IBM Corp. 2004 All Rights Reserved.\n"
21 "tape_class.c"
22);
23MODULE_LICENSE("GPL");
24
25static struct class *tape_class;
26
27/*
28 * Register a tape device and return a pointer to the cdev structure.
29 *
30 * device
31 * The pointer to the struct device of the physical (base) device.
32 * drivername
33 * The pointer to the drivers name for it's character devices.
34 * dev
35 * The intended major/minor number. The major number may be 0 to
36 * get a dynamic major number.
37 * fops
38 * The pointer to the drivers file operations for the tape device.
39 * devname
40 * The pointer to the name of the character device.
41 */
42struct tape_class_device *register_tape_dev(
43 struct device * device,
44 dev_t dev,
45 const struct file_operations *fops,
46 char * device_name,
47 char * mode_name)
48{
49 struct tape_class_device * tcd;
50 int rc;
51 char * s;
52
53 tcd = kzalloc(sizeof(struct tape_class_device), GFP_KERNEL);
54 if (!tcd)
55 return ERR_PTR(-ENOMEM);
56
57 strncpy(tcd->device_name, device_name, TAPECLASS_NAME_LEN);
58 for (s = strchr(tcd->device_name, '/'); s; s = strchr(s, '/'))
59 *s = '!';
60 strncpy(tcd->mode_name, mode_name, TAPECLASS_NAME_LEN);
61 for (s = strchr(tcd->mode_name, '/'); s; s = strchr(s, '/'))
62 *s = '!';
63
64 tcd->char_device = cdev_alloc();
65 if (!tcd->char_device) {
66 rc = -ENOMEM;
67 goto fail_with_tcd;
68 }
69
70 tcd->char_device->owner = fops->owner;
71 tcd->char_device->ops = fops;
72 tcd->char_device->dev = dev;
73
74 rc = cdev_add(tcd->char_device, tcd->char_device->dev, 1);
75 if (rc)
76 goto fail_with_cdev;
77
78 tcd->class_device = device_create(tape_class, device,
79 tcd->char_device->dev, NULL,
80 "%s", tcd->device_name);
81 rc = IS_ERR(tcd->class_device) ? PTR_ERR(tcd->class_device) : 0;
82 if (rc)
83 goto fail_with_cdev;
84 rc = sysfs_create_link(
85 &device->kobj,
86 &tcd->class_device->kobj,
87 tcd->mode_name
88 );
89 if (rc)
90 goto fail_with_class_device;
91
92 return tcd;
93
94fail_with_class_device:
95 device_destroy(tape_class, tcd->char_device->dev);
96
97fail_with_cdev:
98 cdev_del(tcd->char_device);
99
100fail_with_tcd:
101 kfree(tcd);
102
103 return ERR_PTR(rc);
104}
105EXPORT_SYMBOL(register_tape_dev);
106
107void unregister_tape_dev(struct device *device, struct tape_class_device *tcd)
108{
109 if (tcd != NULL && !IS_ERR(tcd)) {
110 sysfs_remove_link(&device->kobj, tcd->mode_name);
111 device_destroy(tape_class, tcd->char_device->dev);
112 cdev_del(tcd->char_device);
113 kfree(tcd);
114 }
115}
116EXPORT_SYMBOL(unregister_tape_dev);
117
118
119static int __init tape_init(void)
120{
121 tape_class = class_create(THIS_MODULE, "tape390");
122
123 return 0;
124}
125
126static void __exit tape_exit(void)
127{
128 class_destroy(tape_class);
129 tape_class = NULL;
130}
131
132postcore_initcall(tape_init);
133module_exit(tape_exit);
1/*
2 * Copyright IBM Corp. 2004
3 *
4 * Tape class device support
5 *
6 * Author: Stefan Bader <shbader@de.ibm.com>
7 * Based on simple class device code by Greg K-H
8 */
9
10#define KMSG_COMPONENT "tape"
11#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
12
13#include <linux/slab.h>
14
15#include "tape_class.h"
16
17MODULE_AUTHOR("Stefan Bader <shbader@de.ibm.com>");
18MODULE_DESCRIPTION(
19 "Copyright IBM Corp. 2004 All Rights Reserved.\n"
20 "tape_class.c"
21);
22MODULE_LICENSE("GPL");
23
24static struct class *tape_class;
25
26/*
27 * Register a tape device and return a pointer to the cdev structure.
28 *
29 * device
30 * The pointer to the struct device of the physical (base) device.
31 * drivername
32 * The pointer to the drivers name for it's character devices.
33 * dev
34 * The intended major/minor number. The major number may be 0 to
35 * get a dynamic major number.
36 * fops
37 * The pointer to the drivers file operations for the tape device.
38 * devname
39 * The pointer to the name of the character device.
40 */
41struct tape_class_device *register_tape_dev(
42 struct device * device,
43 dev_t dev,
44 const struct file_operations *fops,
45 char * device_name,
46 char * mode_name)
47{
48 struct tape_class_device * tcd;
49 int rc;
50 char * s;
51
52 tcd = kzalloc(sizeof(struct tape_class_device), GFP_KERNEL);
53 if (!tcd)
54 return ERR_PTR(-ENOMEM);
55
56 strncpy(tcd->device_name, device_name, TAPECLASS_NAME_LEN);
57 for (s = strchr(tcd->device_name, '/'); s; s = strchr(s, '/'))
58 *s = '!';
59 strncpy(tcd->mode_name, mode_name, TAPECLASS_NAME_LEN);
60 for (s = strchr(tcd->mode_name, '/'); s; s = strchr(s, '/'))
61 *s = '!';
62
63 tcd->char_device = cdev_alloc();
64 if (!tcd->char_device) {
65 rc = -ENOMEM;
66 goto fail_with_tcd;
67 }
68
69 tcd->char_device->owner = fops->owner;
70 tcd->char_device->ops = fops;
71 tcd->char_device->dev = dev;
72
73 rc = cdev_add(tcd->char_device, tcd->char_device->dev, 1);
74 if (rc)
75 goto fail_with_cdev;
76
77 tcd->class_device = device_create(tape_class, device,
78 tcd->char_device->dev, NULL,
79 "%s", tcd->device_name);
80 rc = PTR_RET(tcd->class_device);
81 if (rc)
82 goto fail_with_cdev;
83 rc = sysfs_create_link(
84 &device->kobj,
85 &tcd->class_device->kobj,
86 tcd->mode_name
87 );
88 if (rc)
89 goto fail_with_class_device;
90
91 return tcd;
92
93fail_with_class_device:
94 device_destroy(tape_class, tcd->char_device->dev);
95
96fail_with_cdev:
97 cdev_del(tcd->char_device);
98
99fail_with_tcd:
100 kfree(tcd);
101
102 return ERR_PTR(rc);
103}
104EXPORT_SYMBOL(register_tape_dev);
105
106void unregister_tape_dev(struct device *device, struct tape_class_device *tcd)
107{
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);
112 kfree(tcd);
113 }
114}
115EXPORT_SYMBOL(unregister_tape_dev);
116
117
118static int __init tape_init(void)
119{
120 tape_class = class_create(THIS_MODULE, "tape390");
121
122 return 0;
123}
124
125static void __exit tape_exit(void)
126{
127 class_destroy(tape_class);
128 tape_class = NULL;
129}
130
131postcore_initcall(tape_init);
132module_exit(tape_exit);