/* * drivers/power/process.c - Functions for saving/restoring console. * * Originally from swsusp. */ #include <linux/vt_kern.h> #include <linux/kbd_kern.h> #include <linux/console.h> #include "power.h" #if defined(CONFIG_VT) && defined(CONFIG_VT_CONSOLE) #define SUSPEND_CONSOLE (MAX_NR_CONSOLES-1) static int orig_fgconsole, orig_kmsg; int pm_prepare_console(void) { acquire_console_sem(); orig_fgconsole = fg_console; if (vc_allocate(SUSPEND_CONSOLE)) { /* we can't have a free VC for now. Too bad, * we don't want to mess the screen for now. */ release_console_sem(); return 1; } set_console(SUSPEND_CONSOLE); release_console_sem(); if (vt_waitactive(SUSPEND_CONSOLE)) { pr_debug("Suspend: Can't switch VCs."); return 1; } orig_kmsg = kmsg_redirect; kmsg_redirect = SUSPEND_CONSOLE; return 0; } void pm_restore_console(void) { acquire_console_sem(); set_console(orig_fgconsole); release_console_sem(); kmsg_redirect = orig_kmsg; return; } #endif