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
32 struct adummy_dev {
33 struct atm_dev *atm_dev;
34
35 struct list_head entry;
36 };
37
38 /* globals */
39
40 static LIST_HEAD(adummy_devs);
41
42 static int __init
43 adummy_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
51 static int
52 adummy_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
66 static void
67 adummy_close(struct atm_vcc *vcc)
68 {
69 clear_bit(ATM_VF_READY, &vcc->flags);
70 clear_bit(ATM_VF_ADDR, &vcc->flags);
71 }
72
73 static int
74 adummy_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
85 static int
86 adummy_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
96 static 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
105 static 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);
137 out:
138 return err;
139
140 out_unregister:
141 atm_dev_deregister(atm_dev);
142 out_kfree:
143 kfree(adummy_dev);
144 goto out;
145 }
146
147 static 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
157 module_init(adummy_init);
158 module_exit(adummy_cleanup);
159
160 MODULE_AUTHOR("chas williams <chas@cmf.nrl.navy.mil>");
161 MODULE_DESCRIPTION("dummy ATM driver");
162 MODULE_LICENSE("GPL");
163
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