]>
git.proxmox.com Git - mirror_ubuntu-artful-kernel.git/blob - kernel/power/console.c
2 * drivers/power/process.c - Functions for saving/restoring console.
4 * Originally from swsusp.
7 #include <linux/vt_kern.h>
8 #include <linux/kbd_kern.h>
9 #include <linux/console.h>
12 #if defined(CONFIG_VT) && defined(CONFIG_VT_CONSOLE)
13 #define SUSPEND_CONSOLE (MAX_NR_CONSOLES-1)
15 static int orig_fgconsole
, orig_kmsg
;
17 int pm_prepare_console(void)
19 acquire_console_sem();
21 orig_fgconsole
= fg_console
;
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();
30 if (set_console(SUSPEND_CONSOLE
)) {
32 * We're unable to switch to the SUSPEND_CONSOLE.
33 * Let the calling function know so it can decide
36 release_console_sem();
39 release_console_sem();
41 if (vt_waitactive(SUSPEND_CONSOLE
)) {
42 pr_debug("Suspend: Can't switch VCs.");
45 orig_kmsg
= kmsg_redirect
;
46 kmsg_redirect
= SUSPEND_CONSOLE
;
50 void pm_restore_console(void)
52 acquire_console_sem();
53 set_console(orig_fgconsole
);
54 release_console_sem();
55 kmsg_redirect
= orig_kmsg
;