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/vt.h>
  10 #include <linux/module.h>
  11 #include "power.h"
  12
  13 #if defined(CONFIG_VT) && defined(CONFIG_VT_CONSOLE)
  14 #define SUSPEND_CONSOLE (MAX_NR_CONSOLES-1)
  15
  16 static int orig_fgconsole, orig_kmsg;
  17
  18 int pm_prepare_console(void)
  19 {
  20         orig_fgconsole = vt_move_to_console(SUSPEND_CONSOLE, 1);
  21         if (orig_fgconsole < 0)
  22                 return 1;
  23
  24         orig_kmsg = vt_kmsg_redirect(SUSPEND_CONSOLE);
  25         return 0;
  26 }
  27
  28 void pm_restore_console(void)
  29 {
  30         if (orig_fgconsole >= 0) {
  31                 vt_move_to_console(orig_fgconsole, 0);
  32                 vt_kmsg_redirect(orig_kmsg);
  33         }
  34 }
  35 #endif