Linux/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 }
 34

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