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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 | ||
46cd2f32 RW |
12 | #if defined(CONFIG_VT) && defined(CONFIG_VT_CONSOLE) |
13 | #define SUSPEND_CONSOLE (MAX_NR_CONSOLES-1) | |
14 | ||
1da177e4 | 15 | static int orig_fgconsole, orig_kmsg; |
1da177e4 LT |
16 | |
17 | int pm_prepare_console(void) | |
18 | { | |
1da177e4 LT |
19 | acquire_console_sem(); |
20 | ||
21 | orig_fgconsole = fg_console; | |
22 | ||
23 | if (vc_allocate(SUSPEND_CONSOLE)) { | |
24 | /* we can't have a free VC for now. Too bad, | |
25 | * we don't want to mess the screen for now. */ | |
26 | release_console_sem(); | |
27 | return 1; | |
28 | } | |
29 | ||
30 | set_console(SUSPEND_CONSOLE); | |
31 | release_console_sem(); | |
32 | ||
33 | if (vt_waitactive(SUSPEND_CONSOLE)) { | |
34 | pr_debug("Suspend: Can't switch VCs."); | |
35 | return 1; | |
36 | } | |
37 | orig_kmsg = kmsg_redirect; | |
38 | kmsg_redirect = SUSPEND_CONSOLE; | |
1da177e4 LT |
39 | return 0; |
40 | } | |
41 | ||
42 | void pm_restore_console(void) | |
43 | { | |
1da177e4 LT |
44 | acquire_console_sem(); |
45 | set_console(orig_fgconsole); | |
46 | release_console_sem(); | |
47 | kmsg_redirect = orig_kmsg; | |
1da177e4 LT |
48 | return; |
49 | } | |
f7b8988f | 50 | #endif |