1 files changed, 58 insertions, 0 deletions

diff --git a/kernel/power/console.c b/kernel/power/console.c
new file mode 100644
index 000000000000..7ff375e7c95f
--- /dev/null
+++ b/kernel/power/console.c
@@ -0,0 +1,58 @@
+/*
+ * 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"
+
+static int new_loglevel = 10;
+static int orig_loglevel;
+#ifdef SUSPEND_CONSOLE
+static int orig_fgconsole, orig_kmsg;
+#endif
+
+int pm_prepare_console(void)
+{
+        orig_loglevel = console_loglevel;
+        console_loglevel = new_loglevel;
+
+#ifdef SUSPEND_CONSOLE
+        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;
+#endif
+        return 0;
+}
+
+void pm_restore_console(void)
+{
+        console_loglevel = orig_loglevel;
+#ifdef SUSPEND_CONSOLE
+        acquire_console_sem();
+        set_console(orig_fgconsole);
+        release_console_sem();
+        kmsg_redirect = orig_kmsg;
+#endif
+        return;
+}