tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * adummy.c: a dummy ATM driver
3 */
4
5#include <linux/module.h>
6#include <linux/kernel.h>
7#include <linux/skbuff.h>
8#include <linux/errno.h>
9#include <linux/types.h>
10#include <linux/string.h>
11#include <linux/delay.h>
12#include <linux/init.h>
13#include <linux/mm.h>
14#include <linux/timer.h>
15#include <linux/interrupt.h>
16#include <asm/io.h>
17#include <asm/byteorder.h>
18#include <asm/uaccess.h>
19
20#include <linux/atmdev.h>
21#include <linux/atm.h>
22#include <linux/sonet.h>
23
24/* version definition */
25
26#define DRV_VERSION "1.0"
27
28#define DEV_LABEL "adummy"
29
30#define ADUMMY_DEV(dev) ((struct adummy_dev *) (dev)->dev_data)
31
32struct adummy_dev {
33 struct atm_dev *atm_dev;
34
35 struct list_head entry;
36};
37
38/* globals */
39
40static LIST_HEAD(adummy_devs);
41
42static int __init
43adummy_start(struct atm_dev *dev)
44{
45 dev->ci_range.vpi_bits = 4;
46 dev->ci_range.vci_bits = 12;
47
48 return 0;
49}
50
51static int
52adummy_open(struct atm_vcc *vcc)
53{
54 short vpi = vcc->vpi;
55 int vci = vcc->vci;
56
57 if (vci == ATM_VCI_UNSPEC || vpi == ATM_VPI_UNSPEC)
58 return 0;
59
60 set_bit(ATM_VF_ADDR, &vcc->flags);
61 set_bit(ATM_VF_READY, &vcc->flags);
62
63 return 0;
64}
65
66static void
67adummy_close(struct atm_vcc *vcc)
68{
69 clear_bit(ATM_VF_READY, &vcc->flags);
70 clear_bit(ATM_VF_ADDR, &vcc->flags);
71}
72
73static int
74adummy_send(struct atm_vcc *vcc, struct sk_buff *skb)
75{
76 if (vcc->pop)
77 vcc->pop(vcc, skb);
78 else
79 dev_kfree_skb_any(skb);
80 atomic_inc(&vcc->stats->tx);
81
82 return 0;
83}
84
85static int
86adummy_proc_read(struct atm_dev *dev, loff_t *pos, char *page)
87{
88 int left = *pos;
89
90 if (!left--)
91 return sprintf(page, "version %s\n", DRV_VERSION);
92
93 return 0;
94}
95
96static struct atmdev_ops adummy_ops =
97{
98 .open = adummy_open,
99 .close = adummy_close,
100 .send = adummy_send,
101 .proc_read = adummy_proc_read,
102 .owner = THIS_MODULE
103};
104
105static int __init adummy_init(void)
106{
107 struct atm_dev *atm_dev;
108 struct adummy_dev *adummy_dev;
109 int err = 0;
110
111 printk(KERN_ERR "adummy: version %s\n", DRV_VERSION);
112
113 adummy_dev = kzalloc(sizeof(struct adummy_dev),
114 GFP_KERNEL);
115 if (!adummy_dev) {
116 printk(KERN_ERR DEV_LABEL ": kzalloc() failed\n");
117 err = -ENOMEM;
118 goto out;
119 }
120 atm_dev = atm_dev_register(DEV_LABEL, &adummy_ops, -1, NULL);
121 if (!atm_dev) {
122 printk(KERN_ERR DEV_LABEL ": atm_dev_register() failed\n");
123 err = -ENODEV;
124 goto out_kfree;
125 }
126
127 adummy_dev->atm_dev = atm_dev;
128 atm_dev->dev_data = adummy_dev;
129
130 if (adummy_start(atm_dev)) {
131 printk(KERN_ERR DEV_LABEL ": adummy_start() failed\n");
132 err = -ENODEV;
133 goto out_unregister;
134 }
135
136 list_add(&adummy_dev->entry, &adummy_devs);
137out:
138 return err;
139
140out_unregister:
141 atm_dev_deregister(atm_dev);
142out_kfree:
143 kfree(adummy_dev);
144 goto out;
145}
146
147static void __exit adummy_cleanup(void)
148{
149 struct adummy_dev *adummy_dev, *next;
150
151 list_for_each_entry_safe(adummy_dev, next, &adummy_devs, entry) {
152 atm_dev_deregister(adummy_dev->atm_dev);
153 kfree(adummy_dev);
154 }
155}
156
157module_init(adummy_init);
158module_exit(adummy_cleanup);
159
160MODULE_AUTHOR("chas williams <chas@cmf.nrl.navy.mil>");
161MODULE_DESCRIPTION("dummy ATM driver");
162MODULE_LICENSE("GPL");