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 #ifdef SUSPEND_CONSOLE
13 static int orig_fgconsole, orig_kmsg;
15 int pm_prepare_console(void)
17 acquire_console_sem();
19 orig_fgconsole = fg_console;
21 if (vc_allocate(SUSPEND_CONSOLE)) {
22 /* we can't have a free VC for now. Too bad,
23 * we don't want to mess the screen for now. */
24 release_console_sem();
28 set_console(SUSPEND_CONSOLE);
29 release_console_sem();
31 if (vt_waitactive(SUSPEND_CONSOLE)) {
32 pr_debug("Suspend: Can't switch VCs.");
35 orig_kmsg = kmsg_redirect;
36 kmsg_redirect = SUSPEND_CONSOLE;
40 void pm_restore_console(void)
42 acquire_console_sem();
43 set_console(orig_fgconsole);
44 release_console_sem();
45 kmsg_redirect = orig_kmsg;