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 <linux/slab.h>
17#include <asm/io.h>
18#include <asm/byteorder.h>
19#include <linux/uaccess.h>
20
21#include <linux/atmdev.h>
22#include <linux/atm.h>
23#include <linux/sonet.h>
24
25/* version definition */
26
27#define DRV_VERSION "1.0"
28
29#define DEV_LABEL "adummy"
30
31#define ADUMMY_DEV(dev) ((struct adummy_dev *) (dev)->dev_data)
32
33struct adummy_dev {
34 struct atm_dev *atm_dev;
35
36 struct list_head entry;
37};
38
39/* globals */
40
41static LIST_HEAD(adummy_devs);
42
43static ssize_t __set_signal(struct device *dev,
44 struct device_attribute *attr,
45 const char *buf, size_t len)
46{
47 struct atm_dev *atm_dev = container_of(dev, struct atm_dev, class_dev);
48 int signal;
49
50 if (sscanf(buf, "%d", &signal) == 1) {
51
52 if (signal < ATM_PHY_SIG_LOST || signal > ATM_PHY_SIG_FOUND)
53 signal = ATM_PHY_SIG_UNKNOWN;
54
55 atm_dev_signal_change(atm_dev, signal);
56 return 1;
57 }
58 return -EINVAL;
59}
60
61static ssize_t __show_signal(struct device *dev,
62 struct device_attribute *attr, char *buf)
63{
64 struct atm_dev *atm_dev = container_of(dev, struct atm_dev, class_dev);
65 return sprintf(buf, "%d\n", atm_dev->signal);
66}
67static DEVICE_ATTR(signal, 0644, __show_signal, __set_signal);
68
69static struct attribute *adummy_attrs[] = {
70 &dev_attr_signal.attr,
71 NULL
72};
73
74static const struct attribute_group adummy_group_attrs = {
75 .name = NULL, /* We want them in dev's root folder */
76 .attrs = adummy_attrs
77};
78
79static int __init
80adummy_start(struct atm_dev *dev)
81{
82 dev->ci_range.vpi_bits = 4;
83 dev->ci_range.vci_bits = 12;
84
85 return 0;
86}
87
88static int
89adummy_open(struct atm_vcc *vcc)
90{
91 short vpi = vcc->vpi;
92 int vci = vcc->vci;
93
94 if (vci == ATM_VCI_UNSPEC || vpi == ATM_VPI_UNSPEC)
95 return 0;
96
97 set_bit(ATM_VF_ADDR, &vcc->flags);
98 set_bit(ATM_VF_READY, &vcc->flags);
99
100 return 0;
101}
102
103static void
104adummy_close(struct atm_vcc *vcc)
105{
106 clear_bit(ATM_VF_READY, &vcc->flags);
107 clear_bit(ATM_VF_ADDR, &vcc->flags);
108}
109
110static int
111adummy_send(struct atm_vcc *vcc, struct sk_buff *skb)
112{
113 if (vcc->pop)
114 vcc->pop(vcc, skb);
115 else
116 dev_kfree_skb_any(skb);
117 atomic_inc(&vcc->stats->tx);
118
119 return 0;
120}
121
122static int
123adummy_proc_read(struct atm_dev *dev, loff_t *pos, char *page)
124{
125 int left = *pos;
126
127 if (!left--)
128 return sprintf(page, "version %s\n", DRV_VERSION);
129
130 return 0;
131}
132
133static const struct atmdev_ops adummy_ops =
134{
135 .open = adummy_open,
136 .close = adummy_close,
137 .send = adummy_send,
138 .proc_read = adummy_proc_read,
139 .owner = THIS_MODULE
140};
141
142static int __init adummy_init(void)
143{
144 struct atm_dev *atm_dev;
145 struct adummy_dev *adummy_dev;
146 int err = 0;
147
148 printk(KERN_ERR "adummy: version %s\n", DRV_VERSION);
149
150 adummy_dev = kzalloc(sizeof(struct adummy_dev),
151 GFP_KERNEL);
152 if (!adummy_dev) {
153 printk(KERN_ERR DEV_LABEL ": kzalloc() failed\n");
154 err = -ENOMEM;
155 goto out;
156 }
157 atm_dev = atm_dev_register(DEV_LABEL, NULL, &adummy_ops, -1, NULL);
158 if (!atm_dev) {
159 printk(KERN_ERR DEV_LABEL ": atm_dev_register() failed\n");
160 err = -ENODEV;
161 goto out_kfree;
162 }
163
164 adummy_dev->atm_dev = atm_dev;
165 atm_dev->dev_data = adummy_dev;
166
167 if (sysfs_create_group(&atm_dev->class_dev.kobj, &adummy_group_attrs))
168 dev_err(&atm_dev->class_dev, "Could not register attrs for adummy\n");
169
170 if (adummy_start(atm_dev)) {
171 printk(KERN_ERR DEV_LABEL ": adummy_start() failed\n");
172 err = -ENODEV;
173 goto out_unregister;
174 }
175
176 list_add(&adummy_dev->entry, &adummy_devs);
177out:
178 return err;
179
180out_unregister:
181 atm_dev_deregister(atm_dev);
182out_kfree:
183 kfree(adummy_dev);
184 goto out;
185}
186
187static void __exit adummy_cleanup(void)
188{
189 struct adummy_dev *adummy_dev, *next;
190
191 list_for_each_entry_safe(adummy_dev, next, &adummy_devs, entry) {
192 atm_dev_deregister(adummy_dev->atm_dev);
193 kfree(adummy_dev);
194 }
195}
196
197module_init(adummy_init);
198module_exit(adummy_cleanup);
199
200MODULE_AUTHOR("chas williams <chas@cmf.nrl.navy.mil>");
201MODULE_DESCRIPTION("dummy ATM driver");
202MODULE_LICENSE("GPL");
203