#include <linux/vt_kern.h>
#include <linux/kbd_kern.h>
#include <linux/console.h>
+#include <linux/module.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;
+static int disable_vt_switch;
+
+/*
+ * Normally during a suspend, we allocate a new console and switch to it.
+ * When we resume, we switch back to the original console. This switch
+ * can be slow, so on systems where the framebuffer can handle restoration
+ * of video registers anyways, there's little point in doing the console
+ * switch. This function allows you to disable it by passing it '0'.
+ */
+void pm_set_vt_switch(int do_switch)
+{
+ acquire_console_sem();
+ disable_vt_switch = !do_switch;
+ release_console_sem();
+}
+EXPORT_SYMBOL(pm_set_vt_switch);
int pm_prepare_console(void)
{
acquire_console_sem();
+ if (disable_vt_switch) {
+ release_console_sem();
+ return 0;
+ }
+
orig_fgconsole = fg_console;
if (vc_allocate(SUSPEND_CONSOLE)) {
return 1;
}
- set_console(SUSPEND_CONSOLE);
+ 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)) {
void pm_restore_console(void)
{
acquire_console_sem();
+ if (disable_vt_switch) {
+ release_console_sem();
+ return;
+ }
set_console(orig_fgconsole);
release_console_sem();
+
+ if (vt_waitactive(orig_fgconsole)) {
+ pr_debug("Resume: Can't switch VCs.");
+ return;
+ }
+
kmsg_redirect = orig_kmsg;
- return;
}
#endif