Signed-off-by: Arve Hjønnevåg <arve@xxxxxxxxxxx>--- 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.txtnew file mode 100644index 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.hnew file mode 100755index 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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