PM: earlysuspend: Add console switch when user requested sleep state changes.
Signed-off-by: Arve Hjønnevåg <arve@android.com>
diff --git a/kernel/power/consoleearlysuspend.c b/kernel/power/consoleearlysuspend.c
new file mode 100644
index 0000000..a8befb4
--- /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))
+ 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))
+ 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);
+