Commit | Line | Data |
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23308ba5 JS |
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 | */ | |
16 | static 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; | |
23308ba5 JS |
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 | ||
652586df TH |
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' : '-', | |
23308ba5 JS |
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 | ||
63 | static void *c_start(struct seq_file *m, loff_t *pos) | |
64 | { | |
65 | struct console *con; | |
66 | loff_t off = 0; | |
67 | ||
ac751efa | 68 | console_lock(); |
23308ba5 JS |
69 | for_each_console(con) |
70 | if (off++ == *pos) | |
71 | break; | |
72 | ||
73 | return con; | |
74 | } | |
75 | ||
76 | static 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 | ||
83 | static void c_stop(struct seq_file *m, void *v) | |
84 | { | |
ac751efa | 85 | console_unlock(); |
23308ba5 JS |
86 | } |
87 | ||
88 | static 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 | ||
95 | static int consoles_open(struct inode *inode, struct file *file) | |
96 | { | |
97 | return seq_open(file, &consoles_op); | |
98 | } | |
99 | ||
100 | static 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 | ||
bf33cbdf | 107 | static int __init proc_consoles_init(void) |
23308ba5 JS |
108 | { |
109 | proc_create("consoles", 0, NULL, &proc_consoles_operations); | |
110 | return 0; | |
111 | } | |
bf33cbdf | 112 | module_init(proc_consoles_init); |