xref: /linux/drivers/atm/adummy.c (revision 14b42963f64b98ab61fa9723c03d71aa5ef4f862)
1 /*
2  * adummy.c: a dummy ATM driver
3  */
4 
5 #include <linux/module.h>
6 #include <linux/version.h>
7 #include <linux/kernel.h>
8 #include <linux/skbuff.h>
9 #include <linux/pci.h>
10 #include <linux/errno.h>
11 #include <linux/types.h>
12 #include <linux/string.h>
13 #include <linux/delay.h>
14 #include <linux/init.h>
15 #include <linux/mm.h>
16 #include <linux/sched.h>
17 #include <linux/timer.h>
18 #include <linux/interrupt.h>
19 #include <asm/io.h>
20 #include <asm/byteorder.h>
21 #include <asm/uaccess.h>
22 
23 #include <linux/atmdev.h>
24 #include <linux/atm.h>
25 #include <linux/sonet.h>
26 
27 /* version definition */
28 
29 #define DRV_VERSION "1.0"
30 
31 #define DEV_LABEL "adummy"
32 
33 #define ADUMMY_DEV(dev) ((struct adummy_dev *) (dev)->dev_data)
34 
35 struct adummy_dev {
36 	struct atm_dev *atm_dev;
37 
38 	struct list_head entry;
39 };
40 
41 /* globals */
42 
43 static LIST_HEAD(adummy_devs);
44 
45 static int __init
46 adummy_start(struct atm_dev *dev)
47 {
48 	dev->ci_range.vpi_bits = 4;
49 	dev->ci_range.vci_bits = 12;
50 
51 	return 0;
52 }
53 
54 static int
55 adummy_open(struct atm_vcc *vcc)
56 {
57 	short vpi = vcc->vpi;
58 	int vci = vcc->vci;
59 
60 	if (vci == ATM_VCI_UNSPEC || vpi == ATM_VPI_UNSPEC)
61 		return 0;
62 
63 	set_bit(ATM_VF_ADDR, &vcc->flags);
64 	set_bit(ATM_VF_READY, &vcc->flags);
65 
66 	return 0;
67 }
68 
69 static void
70 adummy_close(struct atm_vcc *vcc)
71 {
72 	clear_bit(ATM_VF_READY, &vcc->flags);
73 	clear_bit(ATM_VF_ADDR, &vcc->flags);
74 }
75 
76 static int
77 adummy_send(struct atm_vcc *vcc, struct sk_buff *skb)
78 {
79 	if (vcc->pop)
80 		vcc->pop(vcc, skb);
81 	else
82 		dev_kfree_skb_any(skb);
83 	atomic_inc(&vcc->stats->tx);
84 
85 	return 0;
86 }
87 
88 static int
89 adummy_proc_read(struct atm_dev *dev, loff_t *pos, char *page)
90 {
91 	int left = *pos;
92 
93 	if (!left--)
94 		return sprintf(page, "version %s\n", DRV_VERSION);
95 
96 	return 0;
97 }
98 
99 static struct atmdev_ops adummy_ops =
100 {
101 	.open =		adummy_open,
102 	.close =	adummy_close,
103 	.send =		adummy_send,
104 	.proc_read =	adummy_proc_read,
105 	.owner =	THIS_MODULE
106 };
107 
108 static int __init adummy_init(void)
109 {
110 	struct atm_dev *atm_dev;
111 	struct adummy_dev *adummy_dev;
112 	int err = 0;
113 
114 	printk(KERN_ERR "adummy: version %s\n", DRV_VERSION);
115 
116 	adummy_dev = (struct adummy_dev *) kmalloc(sizeof(struct adummy_dev),
117 						   GFP_KERNEL);
118 	if (!adummy_dev) {
119 		printk(KERN_ERR DEV_LABEL ": kmalloc() failed\n");
120 		err = -ENOMEM;
121 		goto out;
122 	}
123 	memset(adummy_dev, 0, sizeof(struct adummy_dev));
124 
125 	atm_dev = atm_dev_register(DEV_LABEL, &adummy_ops, -1, NULL);
126 	if (!atm_dev) {
127 		printk(KERN_ERR DEV_LABEL ": atm_dev_register() failed\n");
128 		err = -ENODEV;
129 		goto out_kfree;
130 	}
131 
132 	adummy_dev->atm_dev = atm_dev;
133 	atm_dev->dev_data = adummy_dev;
134 
135 	if (adummy_start(atm_dev)) {
136 		printk(KERN_ERR DEV_LABEL ": adummy_start() failed\n");
137 		err = -ENODEV;
138 		goto out_unregister;
139 	}
140 
141 	list_add(&adummy_dev->entry, &adummy_devs);
142 out:
143 	return err;
144 
145 out_unregister:
146 	atm_dev_deregister(atm_dev);
147 out_kfree:
148 	kfree(adummy_dev);
149 	goto out;
150 }
151 
152 static void __exit adummy_cleanup(void)
153 {
154 	struct adummy_dev *adummy_dev, *next;
155 
156 	list_for_each_entry_safe(adummy_dev, next, &adummy_devs, entry) {
157 		atm_dev_deregister(adummy_dev->atm_dev);
158 		kfree(adummy_dev);
159 	}
160 }
161 
162 module_init(adummy_init);
163 module_exit(adummy_cleanup);
164 
165 MODULE_AUTHOR("chas williams <chas@cmf.nrl.navy.mil>");
166 MODULE_DESCRIPTION("dummy ATM driver");
167 MODULE_LICENSE("GPL");
168