lguest: optimize by coding restore_flags and irq_enable in assembler.
[linux-2.6] / drivers / atm / adummy.c
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");