1
2
3
4
5
6
7#include <asm/uaccess.h>
8#include <linux/module.h>
9#include <linux/init.h>
10#include <linux/errno.h>
11#include <linux/time.h>
12#include <linux/proc_fs.h>
13#include <linux/stat.h>
14#include <linux/tty.h>
15#include <linux/seq_file.h>
16#include <linux/bitops.h>
17
18
19
20
21static struct proc_dir_entry *proc_tty_ldisc, *proc_tty_driver;
22
23
24
25
26static void show_tty_range(struct seq_file *m, struct tty_driver *p,
27 dev_t from, int num)
28{
29 seq_printf(m, "%-20s ", p->driver_name ? p->driver_name : "unknown");
30 seq_printf(m, "/dev/%-8s ", p->name);
31 if (p->num > 1) {
32 seq_printf(m, "%3d %d-%d ", MAJOR(from), MINOR(from),
33 MINOR(from) + num - 1);
34 } else {
35 seq_printf(m, "%3d %7d ", MAJOR(from), MINOR(from));
36 }
37 switch (p->type) {
38 case TTY_DRIVER_TYPE_SYSTEM:
39 seq_printf(m, "system");
40 if (p->subtype == SYSTEM_TYPE_TTY)
41 seq_printf(m, ":/dev/tty");
42 else if (p->subtype == SYSTEM_TYPE_SYSCONS)
43 seq_printf(m, ":console");
44 else if (p->subtype == SYSTEM_TYPE_CONSOLE)
45 seq_printf(m, ":vtmaster");
46 break;
47 case TTY_DRIVER_TYPE_CONSOLE:
48 seq_printf(m, "console");
49 break;
50 case TTY_DRIVER_TYPE_SERIAL:
51 seq_printf(m, "serial");
52 break;
53 case TTY_DRIVER_TYPE_PTY:
54 if (p->subtype == PTY_TYPE_MASTER)
55 seq_printf(m, "pty:master");
56 else if (p->subtype == PTY_TYPE_SLAVE)
57 seq_printf(m, "pty:slave");
58 else
59 seq_printf(m, "pty");
60 break;
61 default:
62 seq_printf(m, "type:%d.%d", p->type, p->subtype);
63 }
64 seq_putc(m, '\n');
65}
66
67static int show_tty_driver(struct seq_file *m, void *v)
68{
69 struct tty_driver *p = list_entry(v, struct tty_driver, tty_drivers);
70 dev_t from = MKDEV(p->major, p->minor_start);
71 dev_t to = from + p->num;
72
73 if (&p->tty_drivers == tty_drivers.next) {
74
75 seq_printf(m, "%-20s /dev/%-8s ", "/dev/tty", "tty");
76 seq_printf(m, "%3d %7d ", TTYAUX_MAJOR, 0);
77 seq_printf(m, "system:/dev/tty\n");
78 seq_printf(m, "%-20s /dev/%-8s ", "/dev/console", "console");
79 seq_printf(m, "%3d %7d ", TTYAUX_MAJOR, 1);
80 seq_printf(m, "system:console\n");
81#ifdef CONFIG_UNIX98_PTYS
82 seq_printf(m, "%-20s /dev/%-8s ", "/dev/ptmx", "ptmx");
83 seq_printf(m, "%3d %7d ", TTYAUX_MAJOR, 2);
84 seq_printf(m, "system\n");
85#endif
86#ifdef CONFIG_VT
87 seq_printf(m, "%-20s /dev/%-8s ", "/dev/vc/0", "vc/0");
88 seq_printf(m, "%3d %7d ", TTY_MAJOR, 0);
89 seq_printf(m, "system:vtmaster\n");
90#endif
91 }
92
93 while (MAJOR(from) < MAJOR(to)) {
94 dev_t next = MKDEV(MAJOR(from)+1, 0);
95 show_tty_range(m, p, from, next - from);
96 from = next;
97 }
98 if (from != to)
99 show_tty_range(m, p, from, to - from);
100 return 0;
101}
102
103
104static void *t_start(struct seq_file *m, loff_t *pos)
105{
106 mutex_lock(&tty_mutex);
107 return seq_list_start(&tty_drivers, *pos);
108}
109
110static void *t_next(struct seq_file *m, void *v, loff_t *pos)
111{
112 return seq_list_next(v, &tty_drivers, pos);
113}
114
115static void t_stop(struct seq_file *m, void *v)
116{
117 mutex_unlock(&tty_mutex);
118}
119
120static const struct seq_operations tty_drivers_op = {
121 .start = t_start,
122 .next = t_next,
123 .stop = t_stop,
124 .show = show_tty_driver
125};
126
127static int tty_drivers_open(struct inode *inode, struct file *file)
128{
129 return seq_open(file, &tty_drivers_op);
130}
131
132static const struct file_operations proc_tty_drivers_operations = {
133 .open = tty_drivers_open,
134 .read = seq_read,
135 .llseek = seq_lseek,
136 .release = seq_release,
137};
138
139
140
141
142
143void proc_tty_register_driver(struct tty_driver *driver)
144{
145 struct proc_dir_entry *ent;
146
147 if (!driver->ops->read_proc || !driver->driver_name ||
148 driver->proc_entry)
149 return;
150
151 ent = create_proc_entry(driver->driver_name, 0, proc_tty_driver);
152 if (!ent)
153 return;
154 ent->read_proc = driver->ops->read_proc;
155 ent->owner = driver->owner;
156 ent->data = driver;
157
158 driver->proc_entry = ent;
159}
160
161
162
163
164void proc_tty_unregister_driver(struct tty_driver *driver)
165{
166 struct proc_dir_entry *ent;
167
168 ent = driver->proc_entry;
169 if (!ent)
170 return;
171
172 remove_proc_entry(driver->driver_name, proc_tty_driver);
173
174 driver->proc_entry = NULL;
175}
176
177
178
179
180void __init proc_tty_init(void)
181{
182 if (!proc_mkdir("tty", NULL))
183 return;
184 proc_tty_ldisc = proc_mkdir("tty/ldisc", NULL);
185
186
187
188
189
190
191 proc_tty_driver = proc_mkdir_mode("tty/driver", S_IRUSR|S_IXUSR, NULL);
192 proc_create("tty/ldiscs", 0, NULL, &tty_ldiscs_proc_fops);
193 proc_create("tty/drivers", 0, NULL, &proc_tty_drivers_operations);
194}