[linux-pm] [PATCH 06/13] PM: Implement early suspend api
Arve Hjønnevåg
arve at android.com
Wed Feb 4 18:50:19 PST 2009
Signed-off-by: Arve Hjønnevåg <arve at android.com>
---
kernel/power/Kconfig | 12 +++
kernel/power/Makefile | 1 +
kernel/power/earlysuspend.c | 178 +++++++++++++++++++++++++++++++++++++++++++
kernel/power/power.h | 6 ++
4 files changed, 197 insertions(+), 0 deletions(-)
create mode 100644 kernel/power/earlysuspend.c
diff --git a/kernel/power/Kconfig b/kernel/power/Kconfig
index dd76467..689abfe 100644
--- a/kernel/power/Kconfig
+++ b/kernel/power/Kconfig
@@ -119,6 +119,9 @@ config SUSPEND_FREEZER
config HAS_WAKELOCK
bool
+config HAS_EARLYSUSPEND
+ bool
+
config WAKELOCK
bool "Wake lock"
depends on PM && RTC_CLASS
@@ -144,6 +147,15 @@ config DISABLE_SYS_POWER_STATE
want to run user-space code that does not support wakelocks, do not
enable this option since it removes the interface.
+config EARLYSUSPEND
+ bool "Early suspend"
+ depends on WAKELOCK
+ default y
+ select HAS_EARLYSUSPEND
+ ---help---
+ Call early suspend handlers when the user requested sleep state
+ changes.
+
config HIBERNATION
bool "Hibernation (aka 'suspend to disk')"
depends on PM && SWAP && ARCH_HIBERNATION_POSSIBLE
diff --git a/kernel/power/Makefile b/kernel/power/Makefile
index 8d8672b..2f17e1d 100644
--- a/kernel/power/Makefile
+++ b/kernel/power/Makefile
@@ -7,6 +7,7 @@ obj-y := main.o
obj-$(CONFIG_PM_SLEEP) += console.o
obj-$(CONFIG_FREEZER) += process.o
obj-$(CONFIG_WAKELOCK) += wakelock.o
+obj-$(CONFIG_EARLYSUSPEND) += earlysuspend.o
obj-$(CONFIG_HIBERNATION) += swsusp.o disk.o snapshot.o swap.o user.o
obj-$(CONFIG_MAGIC_SYSRQ) += poweroff.o
diff --git a/kernel/power/earlysuspend.c b/kernel/power/earlysuspend.c
new file mode 100644
index 0000000..4d70a7e
--- /dev/null
+++ b/kernel/power/earlysuspend.c
@@ -0,0 +1,178 @@
+/* kernel/power/earlysuspend.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/earlysuspend.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/rtc.h>
+#include <linux/syscalls.h> /* sys_sync */
+#include <linux/wakelock.h>
+#include <linux/workqueue.h>
+
+#include "power.h"
+
+enum {
+ DEBUG_USER_STATE = 1U << 0,
+ DEBUG_SUSPEND = 1U << 1,
+};
+static int debug_mask = DEBUG_USER_STATE;
+module_param_named(debug_mask, debug_mask, int, S_IRUGO | S_IWUSR | S_IWGRP);
+
+static DEFINE_MUTEX(early_suspend_lock);
+static LIST_HEAD(early_suspend_handlers);
+static void early_suspend(struct work_struct *work);
+static void late_resume(struct work_struct *work);
+static DECLARE_WORK(early_suspend_work, early_suspend);
+static DECLARE_WORK(late_resume_work, late_resume);
+static DEFINE_SPINLOCK(state_lock);
+enum {
+ SUSPEND_REQUESTED = 0x1,
+ SUSPENDED = 0x2,
+ SUSPEND_REQUESTED_AND_SUSPENDED = SUSPEND_REQUESTED | SUSPENDED,
+};
+static int state;
+
+void register_early_suspend(struct early_suspend *handler)
+{
+ struct list_head *pos;
+
+ mutex_lock(&early_suspend_lock);
+ list_for_each(pos, &early_suspend_handlers) {
+ struct early_suspend *e;
+ e = list_entry(pos, struct early_suspend, link);
+ if (e->level > handler->level)
+ break;
+ }
+ list_add_tail(&handler->link, pos);
+ if ((state & SUSPENDED) && handler->suspend)
+ handler->suspend(handler);
+ mutex_unlock(&early_suspend_lock);
+}
+EXPORT_SYMBOL(register_early_suspend);
+
+void unregister_early_suspend(struct early_suspend *handler)
+{
+ mutex_lock(&early_suspend_lock);
+ list_del(&handler->link);
+ mutex_unlock(&early_suspend_lock);
+}
+EXPORT_SYMBOL(unregister_early_suspend);
+
+static void early_suspend(struct work_struct *work)
+{
+ struct early_suspend *pos;
+ unsigned long irqflags;
+ int abort = 0;
+
+ mutex_lock(&early_suspend_lock);
+ spin_lock_irqsave(&state_lock, irqflags);
+ if (state == SUSPEND_REQUESTED)
+ state |= SUSPENDED;
+ else
+ abort = 1;
+ spin_unlock_irqrestore(&state_lock, irqflags);
+
+ if (abort) {
+ if (debug_mask & DEBUG_SUSPEND)
+ pr_info("early_suspend: abort, state %d\n", state);
+ mutex_unlock(&early_suspend_lock);
+ goto abort;
+ }
+
+ if (debug_mask & DEBUG_SUSPEND)
+ pr_info("early_suspend: call handlers\n");
+ list_for_each_entry(pos, &early_suspend_handlers, link) {
+ if (pos->suspend)
+ pos->suspend(pos);
+ }
+ mutex_unlock(&early_suspend_lock);
+
+ if (debug_mask & DEBUG_SUSPEND)
+ pr_info("early_suspend: sync\n");
+
+ sys_sync();
+abort:
+ spin_lock_irqsave(&state_lock, irqflags);
+ if (state == SUSPEND_REQUESTED_AND_SUSPENDED)
+ wake_unlock(&main_wake_lock);
+ spin_unlock_irqrestore(&state_lock, irqflags);
+}
+
+static void late_resume(struct work_struct *work)
+{
+ struct early_suspend *pos;
+ unsigned long irqflags;
+ int abort = 0;
+
+ mutex_lock(&early_suspend_lock);
+ spin_lock_irqsave(&state_lock, irqflags);
+ if (state == SUSPENDED)
+ state = 0; /* clear SUSPENDED */
+ else
+ abort = 1;
+ spin_unlock_irqrestore(&state_lock, irqflags);
+
+ if (abort) {
+ if (debug_mask & DEBUG_SUSPEND)
+ pr_info("late_resume: abort, state %d\n", state);
+ goto abort;
+ }
+ if (debug_mask & DEBUG_SUSPEND)
+ pr_info("late_resume: call handlers\n");
+ list_for_each_entry_reverse(pos, &early_suspend_handlers, link)
+ if (pos->resume)
+ pos->resume(pos);
+ if (debug_mask & DEBUG_SUSPEND)
+ pr_info("late_resume: done\n");
+abort:
+ mutex_unlock(&early_suspend_lock);
+}
+
+void request_suspend_state(suspend_state_t new_state)
+{
+ unsigned long irqflags;
+ int old_sleep;
+
+ spin_lock_irqsave(&state_lock, irqflags);
+ old_sleep = state & SUSPEND_REQUESTED;
+ if (debug_mask & DEBUG_USER_STATE) {
+ struct timespec ts;
+ struct rtc_time tm;
+ getnstimeofday(&ts);
+ rtc_time_to_tm(ts.tv_sec, &tm);
+ pr_info("request_suspend_state: %s (%d->%d) at %lld "
+ "(%d-%02d-%02d %02d:%02d:%02d.%09lu UTC)\n",
+ new_state != PM_SUSPEND_ON ? "sleep" : "wakeup",
+ requested_suspend_state, new_state,
+ ktime_to_ns(ktime_get()),
+ tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday,
+ tm.tm_hour, tm.tm_min, tm.tm_sec, ts.tv_nsec);
+ }
+ if (!old_sleep && new_state != PM_SUSPEND_ON) {
+ state |= SUSPEND_REQUESTED;
+ queue_work(suspend_work_queue, &early_suspend_work);
+ } else if (old_sleep && new_state == PM_SUSPEND_ON) {
+ state &= ~SUSPEND_REQUESTED;
+ wake_lock(&main_wake_lock);
+ queue_work(suspend_work_queue, &late_resume_work);
+ }
+ requested_suspend_state = new_state;
+ spin_unlock_irqrestore(&state_lock, irqflags);
+}
+
+suspend_state_t get_suspend_state(void)
+{
+ return requested_suspend_state;
+}
diff --git a/kernel/power/power.h b/kernel/power/power.h
index ed1b7f4..acbb13a 100644
--- a/kernel/power/power.h
+++ b/kernel/power/power.h
@@ -231,3 +231,9 @@ extern struct wake_lock main_wake_lock;
extern suspend_state_t requested_suspend_state;
extern bool ignore_suspend_wakelocks;
#endif
+
+#ifdef CONFIG_EARLYSUSPEND
+/* kernel/power/earlysuspend.c */
+void request_suspend_state(suspend_state_t state);
+suspend_state_t get_suspend_state(void);
+#endif
--
1.6.1
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