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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * drivers/power/process.c - Functions for saving/restoring console. | |
3 | * | |
4 | * Originally from swsusp. | |
5 | */ | |
6 | ||
7 | #include <linux/vt_kern.h> | |
8 | #include <linux/kbd_kern.h> | |
9 | #include <linux/console.h> | |
10 | #include "power.h" | |
11 | ||
12 | static int new_loglevel = 10; | |
13 | static int orig_loglevel; | |
14 | #ifdef SUSPEND_CONSOLE | |
15 | static int orig_fgconsole, orig_kmsg; | |
16 | #endif | |
17 | ||
18 | int pm_prepare_console(void) | |
19 | { | |
20 | orig_loglevel = console_loglevel; | |
21 | console_loglevel = new_loglevel; | |
22 | ||
23 | #ifdef SUSPEND_CONSOLE | |
24 | acquire_console_sem(); | |
25 | ||
26 | orig_fgconsole = fg_console; | |
27 | ||
28 | if (vc_allocate(SUSPEND_CONSOLE)) { | |
29 | /* we can't have a free VC for now. Too bad, | |
30 | * we don't want to mess the screen for now. */ | |
31 | release_console_sem(); | |
32 | return 1; | |
33 | } | |
34 | ||
35 | set_console(SUSPEND_CONSOLE); | |
36 | release_console_sem(); | |
37 | ||
38 | if (vt_waitactive(SUSPEND_CONSOLE)) { | |
39 | pr_debug("Suspend: Can't switch VCs."); | |
40 | return 1; | |
41 | } | |
42 | orig_kmsg = kmsg_redirect; | |
43 | kmsg_redirect = SUSPEND_CONSOLE; | |
44 | #endif | |
45 | return 0; | |
46 | } | |
47 | ||
48 | void pm_restore_console(void) | |
49 | { | |
50 | console_loglevel = orig_loglevel; | |
51 | #ifdef SUSPEND_CONSOLE | |
52 | acquire_console_sem(); | |
53 | set_console(orig_fgconsole); | |
54 | release_console_sem(); | |
55 | kmsg_redirect = orig_kmsg; | |
56 | #endif | |
57 | return; | |
58 | } |