1 files changed, 112 insertions, 0 deletions
diff --git a/kernel/power/consoleearlysuspend.c b/kernel/power/consoleearlysuspend.c
new file mode 100644
index 000000000000..b6c47d88584a
--- /dev/null
+++ b/kernel/power/consoleearlysuspend.c
@@ -0,0 +1,112 @@
+/* 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 ssize_t console_switch_show(struct kobject *kobj,
+				   struct kobj_attribute *attr, char *buf)
+{
+	return 0;
+}
+
+#define power_ro_attr(_name) \
+	static struct kobj_attribute _name##_attr = {	\
+			.attr	= {				\
+						.name = __stringify(_name),	\
+						.mode = 0444,			\
+					},					\
+			.show	= _name##_show,			\
+			.store	= NULL,		\
+	}
+
+power_ro_attr(console_switch);
+
+static struct attribute *g[] = {
+	&console_switch_attr.attr,
+	NULL,
+};
+
+static struct attribute_group attr_group = {
+	.attrs = g,
+};
+
+static int __init console_early_suspend_init(void)
+{
+	int ret;
+
+	ret = sysfs_create_group(power_kobj, &attr_group);
+	if (ret) {
+		pr_err("android_power_init: sysfs_create_group failed\n");
+		return ret;
+	}
+	register_early_suspend(&console_early_suspend_desc);
+	return 0;
+}
+
+static void __exit console_early_suspend_exit(void)
+{
+	unregister_early_suspend(&console_early_suspend_desc);
+	sysfs_remove_group(power_kobj, &attr_group);
+}
+
+module_init(console_early_suspend_init);
+module_exit(console_early_suspend_exit);