kernel/power/console.c

   1 /*
   2  * 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/vt.h>
  10 #include <linux/module.h>
  11 #include "power.h"
  12
  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         orig_fgconsole = vt_move_to_console(SUSPEND_CONSOLE, 1);
  20         if (orig_fgconsole < 0)
  21                 return 1;
  22
  23         orig_kmsg = vt_kmsg_redirect(SUSPEND_CONSOLE);
  24         return 0;
  25 }
  26
  27 void pm_restore_console(void)
  28 {
  29         if (orig_fgconsole >= 0) {
  30                 vt_move_to_console(orig_fgconsole, 0);
  31                 vt_kmsg_redirect(orig_kmsg);
  32         }
  33 }