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 <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 = kmsg_redirect;
  25         kmsg_redirect = SUSPEND_CONSOLE;
  26         return 0;
  27 }
  28
  29 void pm_restore_console(void)
  30 {
  31         if (orig_fgconsole >= 0) {
  32                 vt_move_to_console(orig_fgconsole, 0);
  33                 kmsg_redirect = orig_kmsg;
  34         }
  35 }
  36 #endif