1/*
2 * Copyright (c) 2010 Werner Fink, Jiri Slaby
3 *
4 * Licensed under GPLv2
5 */
6
7#include <linux/console.h>
8#include <linux/kernel.h>
9#include <linux/proc_fs.h>
10#include <linux/seq_file.h>
11#include <linux/tty_driver.h>
12
13/*
14 * This is handler for /proc/consoles
15 */
16static int show_console_dev(struct seq_file *m, void *v)
17{
18	static const struct {
19		short flag;
20		char name;
21	} con_flags[] = {
22		{ CON_ENABLED,		'E' },
23		{ CON_CONSDEV,		'C' },
24		{ CON_BOOT,		'B' },
25		{ CON_PRINTBUFFER,	'p' },
26		{ CON_BRL,		'b' },
27		{ CON_ANYTIME,		'a' },
28	};
29	char flags[ARRAY_SIZE(con_flags) + 1];
30	struct console *con = v;
31	unsigned int a;
32	dev_t dev = 0;
33
34	if (con->device) {
35		const struct tty_driver *driver;
36		int index;
37		driver = con->device(con, &index);
38		if (driver) {
39			dev = MKDEV(driver->major, driver->minor_start);
40			dev += index;
41		}
42	}
43
44	for (a = 0; a < ARRAY_SIZE(con_flags); a++)
45		flags[a] = (con->flags & con_flags[a].flag) ?
46			con_flags[a].name : ' ';
47	flags[a] = 0;
48
49	seq_setwidth(m, 21 - 1);
50	seq_printf(m, "%s%d", con->name, con->index);
51	seq_pad(m, ' ');
52	seq_printf(m, "%c%c%c (%s)", con->read ? 'R' : '-',
53			con->write ? 'W' : '-', con->unblank ? 'U' : '-',
54			flags);
55	if (dev)
56		seq_printf(m, " %4d:%d", MAJOR(dev), MINOR(dev));
57
58	seq_printf(m, "\n");
59
60	return 0;
61}
62
63static void *c_start(struct seq_file *m, loff_t *pos)
64{
65	struct console *con;
66	loff_t off = 0;
67
68	console_lock();
69	for_each_console(con)
70		if (off++ == *pos)
71			break;
72
73	return con;
74}
75
76static void *c_next(struct seq_file *m, void *v, loff_t *pos)
77{
78	struct console *con = v;
79	++*pos;
80	return con->next;
81}
82
83static void c_stop(struct seq_file *m, void *v)
84{
85	console_unlock();
86}
87
88static const struct seq_operations consoles_op = {
89	.start	= c_start,
90	.next	= c_next,
91	.stop	= c_stop,
92	.show	= show_console_dev
93};
94
95static int consoles_open(struct inode *inode, struct file *file)
96{
97	return seq_open(file, &consoles_op);
98}
99
100static const struct file_operations proc_consoles_operations = {
101	.open		= consoles_open,
102	.read		= seq_read,
103	.llseek		= seq_lseek,
104	.release	= seq_release,
105};
106
107static int __init proc_consoles_init(void)
108{
109	proc_create("consoles", 0, NULL, &proc_consoles_operations);
110	return 0;
111}
112fs_initcall(proc_consoles_init);
113