Linux-2.6.12-rc2
[linux-2.6.git] / kernel / power / console.c
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 }