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f50a7f3d | 1 | // SPDX-License-Identifier: GPL-2.0-only |
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2 | /* |
3 | * Copyright (c) 2010 Werner Fink, Jiri Slaby | |
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4 | */ |
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 | */ | |
15 | static 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; | |
23308ba5 JS |
31 | 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 | ||
652586df TH |
48 | 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' : '-', | |
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52 | con->write ? 'W' : '-', con->unblank ? 'U' : '-', |
53 | flags); | |
54 | if (dev) | |
55 | seq_printf(m, " %4d:%d", MAJOR(dev), MINOR(dev)); | |
56 | ||
4bf8ba81 | 57 | seq_putc(m, '\n'); |
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58 | return 0; |
59 | } | |
60 | ||
61 | static void *c_start(struct seq_file *m, loff_t *pos) | |
62 | { | |
63 | struct console *con; | |
64 | loff_t off = 0; | |
65 | ||
ac751efa | 66 | console_lock(); |
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67 | for_each_console(con) |
68 | if (off++ == *pos) | |
69 | break; | |
70 | ||
71 | return con; | |
72 | } | |
73 | ||
74 | static 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 | ||
81 | static void c_stop(struct seq_file *m, void *v) | |
82 | { | |
ac751efa | 83 | console_unlock(); |
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84 | } |
85 | ||
86 | static 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 | ||
bf33cbdf | 93 | static int __init proc_consoles_init(void) |
23308ba5 | 94 | { |
fddda2b7 | 95 | proc_create_seq("consoles", 0, NULL, &consoles_op); |
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96 | return 0; |
97 | } | |
abaf3787 | 98 | fs_initcall(proc_consoles_init); |