59 lines
1.1 KiB
C
59 lines
1.1 KiB
C
/*
|
|
* 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;
|
|
}
|
|
|
|
if (set_console(SUSPEND_CONSOLE)) {
|
|
/*
|
|
* We're unable to switch to the SUSPEND_CONSOLE.
|
|
* Let the calling function know so it can decide
|
|
* what to do.
|
|
*/
|
|
release_console_sem();
|
|
return 1;
|
|
}
|
|
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
|