1 files changed, 78 insertions, 0 deletions

diff --git a/kernel/power/consoleearlysuspend.c b/kernel/power/consoleearlysuspend.c
new file mode 100644
index 00000000000..a3edcb26738
--- /dev/null
+++ b/kernel/power/consoleearlysuspend.c
@@ -0,0 +1,78 @@
+/* kernel/power/consoleearlysuspend.c
+ *
+ * Copyright (C) 2005-2008 Google, Inc.
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#include <linux/console.h>
+#include <linux/earlysuspend.h>
+#include <linux/kbd_kern.h>
+#include <linux/module.h>
+#include <linux/vt_kern.h>
+#include <linux/wait.h>
+
+#define EARLY_SUSPEND_CONSOLE   (MAX_NR_CONSOLES-1)
+
+static int orig_fgconsole;
+static void console_early_suspend(struct early_suspend *h)
+{
+        acquire_console_sem();
+        orig_fgconsole = fg_console;
+        if (vc_allocate(EARLY_SUSPEND_CONSOLE))
+                goto err;
+        if (set_console(EARLY_SUSPEND_CONSOLE))
+                goto err;
+        release_console_sem();
+
+        if (vt_waitactive(EARLY_SUSPEND_CONSOLE + 1))
+                pr_warning("console_early_suspend: Can't switch VCs.\n");
+        return;
+err:
+        pr_warning("console_early_suspend: Can't set console\n");
+        release_console_sem();
+}
+
+static void console_late_resume(struct early_suspend *h)
+{
+        int ret;
+        acquire_console_sem();
+        ret = set_console(orig_fgconsole);
+        release_console_sem();
+        if (ret) {
+                pr_warning("console_late_resume: Can't set console.\n");
+                return;
+        }
+
+        if (vt_waitactive(orig_fgconsole + 1))
+                pr_warning("console_late_resume: Can't switch VCs.\n");
+}
+
+static struct early_suspend console_early_suspend_desc = {
+        .level = EARLY_SUSPEND_LEVEL_STOP_DRAWING,
+        .suspend = console_early_suspend,
+        .resume = console_late_resume,
+};
+
+static int __init console_early_suspend_init(void)
+{
+        register_early_suspend(&console_early_suspend_desc);
+        return 0;
+}
+
+static void  __exit console_early_suspend_exit(void)
+{
+        unregister_early_suspend(&console_early_suspend_desc);
+}
+
+module_init(console_early_suspend_init);
+module_exit(console_early_suspend_exit);
+