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Thomas Gleixnerf50a7f32019-05-28 09:57:18 -07001// SPDX-License-Identifier: GPL-2.0-only
Jiri Slaby23308ba2010-11-04 16:20:24 +01002/*
3 * Copyright (c) 2010 Werner Fink, Jiri Slaby
Jiri Slaby23308ba2010-11-04 16:20:24 +01004 */
5
6#include <linux/console.h>
7#include <linux/kernel.h>
8#include <linux/proc_fs.h>
9#include <linux/seq_file.h>
10#include <linux/tty_driver.h>
11
12/*
13 * This is handler for /proc/consoles
14 */
15static int show_console_dev(struct seq_file *m, void *v)
16{
17 static const struct {
18 short flag;
19 char name;
20 } con_flags[] = {
21 { CON_ENABLED, 'E' },
22 { CON_CONSDEV, 'C' },
23 { CON_BOOT, 'B' },
24 { CON_PRINTBUFFER, 'p' },
25 { CON_BRL, 'b' },
26 { CON_ANYTIME, 'a' },
27 };
28 char flags[ARRAY_SIZE(con_flags) + 1];
29 struct console *con = v;
30 unsigned int a;
Jiri Slaby23308ba2010-11-04 16:20:24 +010031 dev_t dev = 0;
32
33 if (con->device) {
34 const struct tty_driver *driver;
35 int index;
36 driver = con->device(con, &index);
37 if (driver) {
38 dev = MKDEV(driver->major, driver->minor_start);
39 dev += index;
40 }
41 }
42
43 for (a = 0; a < ARRAY_SIZE(con_flags); a++)
44 flags[a] = (con->flags & con_flags[a].flag) ?
45 con_flags[a].name : ' ';
46 flags[a] = 0;
47
Tetsuo Handa652586d2013-11-14 14:31:57 -080048 seq_setwidth(m, 21 - 1);
49 seq_printf(m, "%s%d", con->name, con->index);
50 seq_pad(m, ' ');
51 seq_printf(m, "%c%c%c (%s)", con->read ? 'R' : '-',
Jiri Slaby23308ba2010-11-04 16:20:24 +010052 con->write ? 'W' : '-', con->unblank ? 'U' : '-',
53 flags);
54 if (dev)
55 seq_printf(m, " %4d:%d", MAJOR(dev), MINOR(dev));
56
Markus Elfring4bf8ba82018-02-06 15:37:34 -080057 seq_putc(m, '\n');
Jiri Slaby23308ba2010-11-04 16:20:24 +010058 return 0;
59}
60
61static void *c_start(struct seq_file *m, loff_t *pos)
62{
63 struct console *con;
64 loff_t off = 0;
65
Torben Hohnac751ef2011-01-25 15:07:35 -080066 console_lock();
Jiri Slaby23308ba2010-11-04 16:20:24 +010067 for_each_console(con)
68 if (off++ == *pos)
69 break;
70
71 return con;
72}
73
74static void *c_next(struct seq_file *m, void *v, loff_t *pos)
75{
76 struct console *con = v;
77 ++*pos;
78 return con->next;
79}
80
81static void c_stop(struct seq_file *m, void *v)
82{
Torben Hohnac751ef2011-01-25 15:07:35 -080083 console_unlock();
Jiri Slaby23308ba2010-11-04 16:20:24 +010084}
85
86static const struct seq_operations consoles_op = {
87 .start = c_start,
88 .next = c_next,
89 .stop = c_stop,
90 .show = show_console_dev
91};
92
Alexey Dobriyanbf33cbd2011-01-12 17:00:36 -080093static int __init proc_consoles_init(void)
Jiri Slaby23308ba2010-11-04 16:20:24 +010094{
Christoph Hellwigfddda2b2018-04-13 19:44:18 +020095 proc_create_seq("consoles", 0, NULL, &consoles_op);
Jiri Slaby23308ba2010-11-04 16:20:24 +010096 return 0;
97}
Paul Gortmakerabaf3782014-01-23 15:55:45 -080098fs_initcall(proc_consoles_init);