[PATCH] swsusp: fix suspend when console is in VT_AUTO+KD_GRAPHICS mode
[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 #if defined(CONFIG_VT) && defined(CONFIG_VT_CONSOLE)
13 #define SUSPEND_CONSOLE (MAX_NR_CONSOLES-1)
14
15 static int orig_fgconsole, orig_kmsg;
16
17 int pm_prepare_console(void)
18 {
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         if (set_console(SUSPEND_CONSOLE)) {
31                 /*
32                  * We're unable to switch to the SUSPEND_CONSOLE.
33                  * Let the calling function know so it can decide
34                  * what to do.
35                  */
36                 release_console_sem();
37                 return 1;
38         }
39         release_console_sem();
40
41         if (vt_waitactive(SUSPEND_CONSOLE)) {
42                 pr_debug("Suspend: Can't switch VCs.");
43                 return 1;
44         }
45         orig_kmsg = kmsg_redirect;
46         kmsg_redirect = SUSPEND_CONSOLE;
47         return 0;
48 }
49
50 void pm_restore_console(void)
51 {
52         acquire_console_sem();
53         set_console(orig_fgconsole);
54         release_console_sem();
55         kmsg_redirect = orig_kmsg;
56         return;
57 }
58 #endif