mirror of
git://projects.qi-hardware.com/openwrt-xburst.git
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git-svn-id: svn://svn.openwrt.org/openwrt/trunk@16459 3c298f89-4303-0410-b956-a3cf2f4a3e73
245 lines
6.9 KiB
Diff
245 lines
6.9 KiB
Diff
From 2d4a25785ad1aa51bad967543e1ab20e9ed4a046 Mon Sep 17 00:00:00 2001
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From: =?utf-8?q?Arve=20Hj=C3=B8nnev=C3=A5g?= <arve@android.com>
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Date: Tue, 7 Oct 2008 20:48:01 -0700
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Subject: [PATCH 067/134] PM: Implement early suspend api
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---
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kernel/power/Kconfig | 12 +++
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kernel/power/Makefile | 1 +
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kernel/power/earlysuspend.c | 178 +++++++++++++++++++++++++++++++++++++++++++
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kernel/power/power.h | 6 ++
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4 files changed, 197 insertions(+), 0 deletions(-)
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create mode 100644 kernel/power/earlysuspend.c
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--- a/kernel/power/Kconfig
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+++ b/kernel/power/Kconfig
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@@ -119,6 +119,9 @@ config SUSPEND_FREEZER
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config HAS_WAKELOCK
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bool
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+config HAS_EARLYSUSPEND
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+ bool
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+
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config WAKELOCK
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bool "Wake lock"
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depends on PM && RTC_CLASS
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@@ -135,6 +138,15 @@ config WAKELOCK_STAT
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---help---
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Report wake lock stats in /proc/wakelocks
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+config EARLYSUSPEND
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+ bool "Early suspend"
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+ depends on WAKELOCK
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+ default y
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+ select HAS_EARLYSUSPEND
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+ ---help---
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+ Call early suspend handlers when the user requested sleep state
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+ changes.
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+
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config HIBERNATION
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bool "Hibernation (aka 'suspend to disk')"
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depends on PM && SWAP && ARCH_HIBERNATION_POSSIBLE
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--- a/kernel/power/Makefile
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+++ b/kernel/power/Makefile
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@@ -7,6 +7,7 @@ obj-$(CONFIG_PM) += main.o
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obj-$(CONFIG_PM_SLEEP) += console.o
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obj-$(CONFIG_FREEZER) += process.o
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obj-$(CONFIG_WAKELOCK) += wakelock.o
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+obj-$(CONFIG_EARLYSUSPEND) += earlysuspend.o
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obj-$(CONFIG_HIBERNATION) += swsusp.o disk.o snapshot.o swap.o user.o
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obj-$(CONFIG_MAGIC_SYSRQ) += poweroff.o
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--- /dev/null
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+++ b/kernel/power/earlysuspend.c
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@@ -0,0 +1,178 @@
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+/* kernel/power/earlysuspend.c
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+ *
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+ * Copyright (C) 2005-2008 Google, Inc.
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+ *
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+ * This software is licensed under the terms of the GNU General Public
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+ * License version 2, as published by the Free Software Foundation, and
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+ * may be copied, distributed, and modified under those terms.
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+ *
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+ * This program is distributed in the hope that it will be useful,
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+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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+ * GNU General Public License for more details.
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+ *
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+ */
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+
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+#include <linux/earlysuspend.h>
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+#include <linux/module.h>
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+#include <linux/mutex.h>
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+#include <linux/rtc.h>
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+#include <linux/syscalls.h> /* sys_sync */
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+#include <linux/wakelock.h>
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+#include <linux/workqueue.h>
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+
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+#include "power.h"
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+
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+enum {
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+ DEBUG_USER_STATE = 1U << 0,
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+ DEBUG_SUSPEND = 1U << 2,
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+};
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+static int debug_mask = DEBUG_USER_STATE;
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+module_param_named(debug_mask, debug_mask, int, S_IRUGO | S_IWUSR | S_IWGRP);
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+
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+static DEFINE_MUTEX(early_suspend_lock);
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+static LIST_HEAD(early_suspend_handlers);
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+static void early_suspend(struct work_struct *work);
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+static void late_resume(struct work_struct *work);
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+static DECLARE_WORK(early_suspend_work, early_suspend);
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+static DECLARE_WORK(late_resume_work, late_resume);
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+static DEFINE_SPINLOCK(state_lock);
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+enum {
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+ SUSPEND_REQUESTED = 0x1,
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+ SUSPENDED = 0x2,
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+ SUSPEND_REQUESTED_AND_SUSPENDED = SUSPEND_REQUESTED | SUSPENDED,
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+};
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+static int state;
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+
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+void register_early_suspend(struct early_suspend *handler)
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+{
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+ struct list_head *pos;
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+
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+ mutex_lock(&early_suspend_lock);
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+ list_for_each(pos, &early_suspend_handlers) {
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+ struct early_suspend *e;
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+ e = list_entry(pos, struct early_suspend, link);
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+ if (e->level > handler->level)
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+ break;
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+ }
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+ list_add_tail(&handler->link, pos);
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+ if ((state & SUSPENDED) && handler->suspend)
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+ handler->suspend(handler);
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+ mutex_unlock(&early_suspend_lock);
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+}
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+EXPORT_SYMBOL(register_early_suspend);
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+
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+void unregister_early_suspend(struct early_suspend *handler)
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+{
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+ mutex_lock(&early_suspend_lock);
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+ list_del(&handler->link);
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+ mutex_unlock(&early_suspend_lock);
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+}
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+EXPORT_SYMBOL(unregister_early_suspend);
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+
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+static void early_suspend(struct work_struct *work)
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+{
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+ struct early_suspend *pos;
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+ unsigned long irqflags;
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+ int abort = 0;
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+
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+ mutex_lock(&early_suspend_lock);
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+ spin_lock_irqsave(&state_lock, irqflags);
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+ if (state == SUSPEND_REQUESTED)
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+ state |= SUSPENDED;
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+ else
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+ abort = 1;
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+ spin_unlock_irqrestore(&state_lock, irqflags);
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+
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+ if (abort) {
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+ if (debug_mask & DEBUG_SUSPEND)
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+ pr_info("early_suspend: abort, state %d\n", state);
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+ mutex_unlock(&early_suspend_lock);
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+ goto abort;
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+ }
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+
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+ if (debug_mask & DEBUG_SUSPEND)
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+ pr_info("early_suspend: call handlers\n");
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+ list_for_each_entry(pos, &early_suspend_handlers, link) {
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+ if (pos->suspend != NULL)
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+ pos->suspend(pos);
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+ }
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+ mutex_unlock(&early_suspend_lock);
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+
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+ if (debug_mask & DEBUG_SUSPEND)
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+ pr_info("early_suspend: sync\n");
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+
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+ sys_sync();
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+abort:
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+ spin_lock_irqsave(&state_lock, irqflags);
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+ if (state == SUSPEND_REQUESTED_AND_SUSPENDED)
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+ wake_unlock(&main_wake_lock);
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+ spin_unlock_irqrestore(&state_lock, irqflags);
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+}
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+
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+static void late_resume(struct work_struct *work)
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+{
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+ struct early_suspend *pos;
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+ unsigned long irqflags;
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+ int abort = 0;
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+
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+ mutex_lock(&early_suspend_lock);
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+ spin_lock_irqsave(&state_lock, irqflags);
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+ if (state == SUSPENDED)
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+ state &= ~SUSPENDED;
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+ else
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+ abort = 1;
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+ spin_unlock_irqrestore(&state_lock, irqflags);
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+
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+ if (abort) {
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+ if (debug_mask & DEBUG_SUSPEND)
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+ pr_info("late_resume: abort, state %d\n", state);
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+ goto abort;
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+ }
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+ if (debug_mask & DEBUG_SUSPEND)
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+ pr_info("late_resume: call handlers\n");
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+ list_for_each_entry_reverse(pos, &early_suspend_handlers, link)
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+ if (pos->resume != NULL)
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+ pos->resume(pos);
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+ if (debug_mask & DEBUG_SUSPEND)
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+ pr_info("late_resume: done\n");
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+abort:
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+ mutex_unlock(&early_suspend_lock);
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+}
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+
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+void request_suspend_state(suspend_state_t new_state)
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+{
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+ unsigned long irqflags;
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+ int old_sleep;
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+
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+ spin_lock_irqsave(&state_lock, irqflags);
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+ old_sleep = state & SUSPEND_REQUESTED;
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+ if (debug_mask & DEBUG_USER_STATE) {
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+ struct timespec ts;
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+ struct rtc_time tm;
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+ getnstimeofday(&ts);
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+ rtc_time_to_tm(ts.tv_sec, &tm);
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+ pr_info("request_suspend_state: %s (%d->%d) at %lld "
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+ "(%d-%02d-%02d %02d:%02d:%02d.%09lu UTC)\n",
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+ new_state != PM_SUSPEND_ON ? "sleep" : "wakeup",
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+ requested_suspend_state, new_state,
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+ ktime_to_ns(ktime_get()),
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+ tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday,
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+ tm.tm_hour, tm.tm_min, tm.tm_sec, ts.tv_nsec);
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+ }
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+ if (!old_sleep && new_state != PM_SUSPEND_ON) {
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+ state |= SUSPEND_REQUESTED;
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+ queue_work(suspend_work_queue, &early_suspend_work);
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+ } else if (old_sleep && new_state == PM_SUSPEND_ON) {
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+ state &= ~SUSPEND_REQUESTED;
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+ wake_lock(&main_wake_lock);
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+ queue_work(suspend_work_queue, &late_resume_work);
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+ }
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+ requested_suspend_state = new_state;
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+ spin_unlock_irqrestore(&state_lock, irqflags);
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+}
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+
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+suspend_state_t get_suspend_state(void)
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+{
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+ return requested_suspend_state;
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+}
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--- a/kernel/power/power.h
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+++ b/kernel/power/power.h
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@@ -230,3 +230,9 @@ extern struct workqueue_struct *suspend_
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extern struct wake_lock main_wake_lock;
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extern suspend_state_t requested_suspend_state;
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#endif
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+
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+#ifdef CONFIG_EARLYSUSPEND
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+/* kernel/power/earlysuspend.c */
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+void request_suspend_state(suspend_state_t state);
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+suspend_state_t get_suspend_state(void);
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+#endif
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