[PATCH 02/13] PM: Add early suspend api.

["Arve Hjønnevåg" <arve@android.com>]

Signed-off-by: Arve Hjønnevåg <arve@android.com>
---
 Documentation/power/early-suspend.txt |   26 +++++++++++++++
 include/linux/earlysuspend.h          |   55 +++++++++++++++++++++++++++++++++
 2 files changed, 81 insertions(+), 0 deletions(-)
 create mode 100644 Documentation/power/early-suspend.txt
 create mode 100755 include/linux/earlysuspend.h

diff --git a/Documentation/power/early-suspend.txt b/Documentation/power/early-suspend.txt
new file mode 100644
index 0000000..8286d3a
--- /dev/null
+++ b/Documentation/power/early-suspend.txt
@@ -0,0 +1,26 @@
+Early-suspend
+=============
+
+The early-suspend api allows drivers to get notified when user-space writes to 
+/sys/power/request_state to indicate that the user visible sleep state should 
+change. A level controls what order the handlers are called in. Suspend 
+handlers are called in low to high level order, resume handlers are called in 
+the opposite order. 
+
+Four levels are defined:
+EARLY_SUSPEND_LEVEL_BLANK_SCREEN:
+  On suspend the screen should be turned off but the framebuffer must still be
+  accessible. On resume the screen can be turned back on.
+
+EARLY_SUSPEND_LEVEL_STOP_DRAWING:
+  On suspend this level notifies user-space that it should stop accessing the 
+  framebuffer and it waits for it to complete. On resume it notifies user-space 
+  that it should resume screen access.
+  Two methods are provided, console switch or a sysfs interface.
+
+EARLY_SUSPEND_LEVEL_DISABLE_FB:
+  Turn off the framebuffer on suspend and back on on resume.
+
+EARLY_SUSPEND_LEVEL_STOP_INPUT:
+  On suspend turn off input devices that are not capable of wakeup or where
+  wakeup is disabled. On resume turn the same devices back on.
diff --git a/include/linux/earlysuspend.h b/include/linux/earlysuspend.h
new file mode 100755
index 0000000..1587a3f
--- /dev/null
+++ b/include/linux/earlysuspend.h
@@ -0,0 +1,55 @@
+/* include/linux/earlysuspend.h
+ *
+ * Copyright (C) 2007-2008 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.
+ *
+ */
+
+#ifndef _LINUX_EARLYSUSPEND_H
+#define _LINUX_EARLYSUSPEND_H
+
+#include <linux/list.h>
+
+/* The early_suspend structure defines suspend and resume hooks to be called
+ * when the user visible sleep state of the system changes, and a level to
+ * control the order. They can be used to turn off the screen and input
+ * devices that are not used for wakeup.
+ * Suspend handlers are called in low to high level order, resume handlers are
+ * called in the opposite order. If, when calling register_early_suspend,
+ * the suspend handlers have already been called without a matching call to the
+ * resume handlers, the suspend handler will be called directly from
+ * register_early_suspend. This direct call can violate the normal level order.
+ */
+enum {
+	EARLY_SUSPEND_LEVEL_BLANK_SCREEN = 50,
+	EARLY_SUSPEND_LEVEL_STOP_INPUT = 75,
+	EARLY_SUSPEND_LEVEL_STOP_DRAWING = 100,
+	EARLY_SUSPEND_LEVEL_DISABLE_FB = 150,
+};
+struct early_suspend {
+#ifdef CONFIG_HAS_EARLYSUSPEND
+	struct list_head link;
+	int level;
+	void (*suspend)(struct early_suspend *h);
+	void (*resume)(struct early_suspend *h);
+#endif
+};
+
+#ifdef CONFIG_HAS_EARLYSUSPEND
+void register_early_suspend(struct early_suspend *handler);
+void unregister_early_suspend(struct early_suspend *handler);
+#else
+#define register_early_suspend(handler) do { } while (0)
+#define unregister_early_suspend(handler) do { } while (0)
+#endif
+
+#endif
+
-- 
1.6.1

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