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09c434b8 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
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2 | /* |
3 | * adummy.c: a dummy ATM driver | |
4 | */ | |
5 | ||
fb296449 | 6 | #include <linux/module.h> |
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7 | #include <linux/kernel.h> |
8 | #include <linux/skbuff.h> | |
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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> | |
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15 | #include <linux/timer.h> |
16 | #include <linux/interrupt.h> | |
5a0e3ad6 | 17 | #include <linux/slab.h> |
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18 | #include <asm/io.h> |
19 | #include <asm/byteorder.h> | |
7c0f6ba6 | 20 | #include <linux/uaccess.h> |
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21 | |
22 | #include <linux/atmdev.h> | |
23 | #include <linux/atm.h> | |
24 | #include <linux/sonet.h> | |
25 | ||
26 | /* version definition */ | |
27 | ||
28 | #define DRV_VERSION "1.0" | |
29 | ||
30 | #define DEV_LABEL "adummy" | |
31 | ||
32 | #define ADUMMY_DEV(dev) ((struct adummy_dev *) (dev)->dev_data) | |
33 | ||
34 | struct adummy_dev { | |
35 | struct atm_dev *atm_dev; | |
36 | ||
37 | struct list_head entry; | |
38 | }; | |
39 | ||
40 | /* globals */ | |
41 | ||
42 | static LIST_HEAD(adummy_devs); | |
43 | ||
c69fb76e KH |
44 | static ssize_t __set_signal(struct device *dev, |
45 | struct device_attribute *attr, | |
46 | const char *buf, size_t len) | |
47 | { | |
48 | struct atm_dev *atm_dev = container_of(dev, struct atm_dev, class_dev); | |
49 | int signal; | |
50 | ||
51 | if (sscanf(buf, "%d", &signal) == 1) { | |
52 | ||
53 | if (signal < ATM_PHY_SIG_LOST || signal > ATM_PHY_SIG_FOUND) | |
54 | signal = ATM_PHY_SIG_UNKNOWN; | |
55 | ||
56 | atm_dev_signal_change(atm_dev, signal); | |
57 | return 1; | |
58 | } | |
59 | return -EINVAL; | |
60 | } | |
61 | ||
62 | static ssize_t __show_signal(struct device *dev, | |
63 | struct device_attribute *attr, char *buf) | |
64 | { | |
65 | struct atm_dev *atm_dev = container_of(dev, struct atm_dev, class_dev); | |
66 | return sprintf(buf, "%d\n", atm_dev->signal); | |
67 | } | |
68 | static DEVICE_ATTR(signal, 0644, __show_signal, __set_signal); | |
69 | ||
70 | static struct attribute *adummy_attrs[] = { | |
71 | &dev_attr_signal.attr, | |
72 | NULL | |
73 | }; | |
74 | ||
444826a9 | 75 | static const struct attribute_group adummy_group_attrs = { |
c69fb76e KH |
76 | .name = NULL, /* We want them in dev's root folder */ |
77 | .attrs = adummy_attrs | |
78 | }; | |
79 | ||
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80 | static int __init |
81 | adummy_start(struct atm_dev *dev) | |
82 | { | |
83 | dev->ci_range.vpi_bits = 4; | |
84 | dev->ci_range.vci_bits = 12; | |
85 | ||
86 | return 0; | |
87 | } | |
88 | ||
89 | static int | |
90 | adummy_open(struct atm_vcc *vcc) | |
91 | { | |
92 | short vpi = vcc->vpi; | |
93 | int vci = vcc->vci; | |
94 | ||
95 | if (vci == ATM_VCI_UNSPEC || vpi == ATM_VPI_UNSPEC) | |
96 | return 0; | |
97 | ||
98 | set_bit(ATM_VF_ADDR, &vcc->flags); | |
99 | set_bit(ATM_VF_READY, &vcc->flags); | |
100 | ||
101 | return 0; | |
102 | } | |
103 | ||
104 | static void | |
105 | adummy_close(struct atm_vcc *vcc) | |
106 | { | |
107 | clear_bit(ATM_VF_READY, &vcc->flags); | |
108 | clear_bit(ATM_VF_ADDR, &vcc->flags); | |
109 | } | |
110 | ||
111 | static int | |
112 | adummy_send(struct atm_vcc *vcc, struct sk_buff *skb) | |
113 | { | |
114 | if (vcc->pop) | |
115 | vcc->pop(vcc, skb); | |
116 | else | |
117 | dev_kfree_skb_any(skb); | |
118 | atomic_inc(&vcc->stats->tx); | |
119 | ||
120 | return 0; | |
121 | } | |
122 | ||
123 | static int | |
124 | adummy_proc_read(struct atm_dev *dev, loff_t *pos, char *page) | |
125 | { | |
126 | int left = *pos; | |
127 | ||
128 | if (!left--) | |
129 | return sprintf(page, "version %s\n", DRV_VERSION); | |
130 | ||
131 | return 0; | |
132 | } | |
133 | ||
46c4b7a5 | 134 | static const struct atmdev_ops adummy_ops = |
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135 | { |
136 | .open = adummy_open, | |
137 | .close = adummy_close, | |
138 | .send = adummy_send, | |
139 | .proc_read = adummy_proc_read, | |
140 | .owner = THIS_MODULE | |
141 | }; | |
142 | ||
143 | static int __init adummy_init(void) | |
144 | { | |
145 | struct atm_dev *atm_dev; | |
146 | struct adummy_dev *adummy_dev; | |
147 | int err = 0; | |
148 | ||
149 | printk(KERN_ERR "adummy: version %s\n", DRV_VERSION); | |
150 | ||
0c1cca1d | 151 | adummy_dev = kzalloc(sizeof(struct adummy_dev), |
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152 | GFP_KERNEL); |
153 | if (!adummy_dev) { | |
0c1cca1d | 154 | printk(KERN_ERR DEV_LABEL ": kzalloc() failed\n"); |
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155 | err = -ENOMEM; |
156 | goto out; | |
157 | } | |
d9ca676b | 158 | atm_dev = atm_dev_register(DEV_LABEL, NULL, &adummy_ops, -1, NULL); |
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159 | if (!atm_dev) { |
160 | printk(KERN_ERR DEV_LABEL ": atm_dev_register() failed\n"); | |
161 | err = -ENODEV; | |
162 | goto out_kfree; | |
163 | } | |
164 | ||
165 | adummy_dev->atm_dev = atm_dev; | |
166 | atm_dev->dev_data = adummy_dev; | |
167 | ||
c69fb76e KH |
168 | if (sysfs_create_group(&atm_dev->class_dev.kobj, &adummy_group_attrs)) |
169 | dev_err(&atm_dev->class_dev, "Could not register attrs for adummy\n"); | |
170 | ||
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171 | if (adummy_start(atm_dev)) { |
172 | printk(KERN_ERR DEV_LABEL ": adummy_start() failed\n"); | |
173 | err = -ENODEV; | |
174 | goto out_unregister; | |
175 | } | |
176 | ||
177 | list_add(&adummy_dev->entry, &adummy_devs); | |
178 | out: | |
179 | return err; | |
180 | ||
181 | out_unregister: | |
182 | atm_dev_deregister(atm_dev); | |
183 | out_kfree: | |
184 | kfree(adummy_dev); | |
185 | goto out; | |
186 | } | |
187 | ||
188 | static void __exit adummy_cleanup(void) | |
189 | { | |
190 | struct adummy_dev *adummy_dev, *next; | |
191 | ||
192 | list_for_each_entry_safe(adummy_dev, next, &adummy_devs, entry) { | |
193 | atm_dev_deregister(adummy_dev->atm_dev); | |
194 | kfree(adummy_dev); | |
195 | } | |
196 | } | |
197 | ||
198 | module_init(adummy_init); | |
199 | module_exit(adummy_cleanup); | |
200 | ||
201 | MODULE_AUTHOR("chas williams <chas@cmf.nrl.navy.mil>"); | |
202 | MODULE_DESCRIPTION("dummy ATM driver"); | |
203 | MODULE_LICENSE("GPL"); |