Commit | Line | Data |
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fb296449 CW |
1 | /* |
2 | * adummy.c: a dummy ATM driver | |
3 | */ | |
4 | ||
fb296449 CW |
5 | #include <linux/module.h> |
6 | #include <linux/version.h> | |
7 | #include <linux/kernel.h> | |
8 | #include <linux/skbuff.h> | |
fb296449 CW |
9 | #include <linux/errno.h> |
10 | #include <linux/types.h> | |
11 | #include <linux/string.h> | |
12 | #include <linux/delay.h> | |
13 | #include <linux/init.h> | |
14 | #include <linux/mm.h> | |
fb296449 CW |
15 | #include <linux/timer.h> |
16 | #include <linux/interrupt.h> | |
17 | #include <asm/io.h> | |
18 | #include <asm/byteorder.h> | |
19 | #include <asm/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 | ||
33 | struct adummy_dev { | |
34 | struct atm_dev *atm_dev; | |
35 | ||
36 | struct list_head entry; | |
37 | }; | |
38 | ||
39 | /* globals */ | |
40 | ||
41 | static LIST_HEAD(adummy_devs); | |
42 | ||
43 | static int __init | |
44 | adummy_start(struct atm_dev *dev) | |
45 | { | |
46 | dev->ci_range.vpi_bits = 4; | |
47 | dev->ci_range.vci_bits = 12; | |
48 | ||
49 | return 0; | |
50 | } | |
51 | ||
52 | static int | |
53 | adummy_open(struct atm_vcc *vcc) | |
54 | { | |
55 | short vpi = vcc->vpi; | |
56 | int vci = vcc->vci; | |
57 | ||
58 | if (vci == ATM_VCI_UNSPEC || vpi == ATM_VPI_UNSPEC) | |
59 | return 0; | |
60 | ||
61 | set_bit(ATM_VF_ADDR, &vcc->flags); | |
62 | set_bit(ATM_VF_READY, &vcc->flags); | |
63 | ||
64 | return 0; | |
65 | } | |
66 | ||
67 | static void | |
68 | adummy_close(struct atm_vcc *vcc) | |
69 | { | |
70 | clear_bit(ATM_VF_READY, &vcc->flags); | |
71 | clear_bit(ATM_VF_ADDR, &vcc->flags); | |
72 | } | |
73 | ||
74 | static int | |
75 | adummy_send(struct atm_vcc *vcc, struct sk_buff *skb) | |
76 | { | |
77 | if (vcc->pop) | |
78 | vcc->pop(vcc, skb); | |
79 | else | |
80 | dev_kfree_skb_any(skb); | |
81 | atomic_inc(&vcc->stats->tx); | |
82 | ||
83 | return 0; | |
84 | } | |
85 | ||
86 | static int | |
87 | adummy_proc_read(struct atm_dev *dev, loff_t *pos, char *page) | |
88 | { | |
89 | int left = *pos; | |
90 | ||
91 | if (!left--) | |
92 | return sprintf(page, "version %s\n", DRV_VERSION); | |
93 | ||
94 | return 0; | |
95 | } | |
96 | ||
97 | static struct atmdev_ops adummy_ops = | |
98 | { | |
99 | .open = adummy_open, | |
100 | .close = adummy_close, | |
101 | .send = adummy_send, | |
102 | .proc_read = adummy_proc_read, | |
103 | .owner = THIS_MODULE | |
104 | }; | |
105 | ||
106 | static int __init adummy_init(void) | |
107 | { | |
108 | struct atm_dev *atm_dev; | |
109 | struct adummy_dev *adummy_dev; | |
110 | int err = 0; | |
111 | ||
112 | printk(KERN_ERR "adummy: version %s\n", DRV_VERSION); | |
113 | ||
0c1cca1d | 114 | adummy_dev = kzalloc(sizeof(struct adummy_dev), |
fb296449 CW |
115 | GFP_KERNEL); |
116 | if (!adummy_dev) { | |
0c1cca1d | 117 | printk(KERN_ERR DEV_LABEL ": kzalloc() failed\n"); |
fb296449 CW |
118 | err = -ENOMEM; |
119 | goto out; | |
120 | } | |
7877327d | 121 | atm_dev = atm_dev_register(DEV_LABEL, &adummy_ops, -1, NULL); |
fb296449 CW |
122 | if (!atm_dev) { |
123 | printk(KERN_ERR DEV_LABEL ": atm_dev_register() failed\n"); | |
124 | err = -ENODEV; | |
125 | goto out_kfree; | |
126 | } | |
127 | ||
128 | adummy_dev->atm_dev = atm_dev; | |
129 | atm_dev->dev_data = adummy_dev; | |
130 | ||
131 | if (adummy_start(atm_dev)) { | |
132 | printk(KERN_ERR DEV_LABEL ": adummy_start() failed\n"); | |
133 | err = -ENODEV; | |
134 | goto out_unregister; | |
135 | } | |
136 | ||
137 | list_add(&adummy_dev->entry, &adummy_devs); | |
138 | out: | |
139 | return err; | |
140 | ||
141 | out_unregister: | |
142 | atm_dev_deregister(atm_dev); | |
143 | out_kfree: | |
144 | kfree(adummy_dev); | |
145 | goto out; | |
146 | } | |
147 | ||
148 | static void __exit adummy_cleanup(void) | |
149 | { | |
150 | struct adummy_dev *adummy_dev, *next; | |
151 | ||
152 | list_for_each_entry_safe(adummy_dev, next, &adummy_devs, entry) { | |
153 | atm_dev_deregister(adummy_dev->atm_dev); | |
154 | kfree(adummy_dev); | |
155 | } | |
156 | } | |
157 | ||
158 | module_init(adummy_init); | |
159 | module_exit(adummy_cleanup); | |
160 | ||
161 | MODULE_AUTHOR("chas williams <chas@cmf.nrl.navy.mil>"); | |
162 | MODULE_DESCRIPTION("dummy ATM driver"); | |
163 | MODULE_LICENSE("GPL"); |