Root/target/linux/goldfish/patches-2.6.30/0067-PM-Implement-early-suspend-api.patch

1From 2d4a25785ad1aa51bad967543e1ab20e9ed4a046 Mon Sep 17 00:00:00 2001
2From: =?utf-8?q?Arve=20Hj=C3=B8nnev=C3=A5g?= <arve@android.com>
3Date: Tue, 7 Oct 2008 20:48:01 -0700
4Subject: [PATCH 067/134] PM: Implement early suspend api
5
6---
7 kernel/power/Kconfig | 12 +++
8 kernel/power/Makefile | 1 +
9 kernel/power/earlysuspend.c | 178 +++++++++++++++++++++++++++++++++++++++++++
10 kernel/power/power.h | 6 ++
11 4 files changed, 197 insertions(+), 0 deletions(-)
12 create mode 100644 kernel/power/earlysuspend.c
13
14--- a/kernel/power/Kconfig
15+++ b/kernel/power/Kconfig
16@@ -119,6 +119,9 @@ config SUSPEND_FREEZER
17 config HAS_WAKELOCK
18     bool
19 
20+config HAS_EARLYSUSPEND
21+ bool
22+
23 config WAKELOCK
24     bool "Wake lock"
25     depends on PM && RTC_CLASS
26@@ -135,6 +138,15 @@ config WAKELOCK_STAT
27     ---help---
28       Report wake lock stats in /proc/wakelocks
29 
30+config EARLYSUSPEND
31+ bool "Early suspend"
32+ depends on WAKELOCK
33+ default y
34+ select HAS_EARLYSUSPEND
35+ ---help---
36+ Call early suspend handlers when the user requested sleep state
37+ changes.
38+
39 config HIBERNATION
40     bool "Hibernation (aka 'suspend to disk')"
41     depends on PM && SWAP && ARCH_HIBERNATION_POSSIBLE
42--- a/kernel/power/Makefile
43+++ b/kernel/power/Makefile
44@@ -7,6 +7,7 @@ obj-$(CONFIG_PM) += main.o
45 obj-$(CONFIG_PM_SLEEP) += console.o
46 obj-$(CONFIG_FREEZER) += process.o
47 obj-$(CONFIG_WAKELOCK) += wakelock.o
48+obj-$(CONFIG_EARLYSUSPEND) += earlysuspend.o
49 obj-$(CONFIG_HIBERNATION) += swsusp.o disk.o snapshot.o swap.o user.o
50 
51 obj-$(CONFIG_MAGIC_SYSRQ) += poweroff.o
52--- /dev/null
53+++ b/kernel/power/earlysuspend.c
54@@ -0,0 +1,178 @@
55+/* kernel/power/earlysuspend.c
56+ *
57+ * Copyright (C) 2005-2008 Google, Inc.
58+ *
59+ * This software is licensed under the terms of the GNU General Public
60+ * License version 2, as published by the Free Software Foundation, and
61+ * may be copied, distributed, and modified under those terms.
62+ *
63+ * This program is distributed in the hope that it will be useful,
64+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
65+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
66+ * GNU General Public License for more details.
67+ *
68+ */
69+
70+#include <linux/earlysuspend.h>
71+#include <linux/module.h>
72+#include <linux/mutex.h>
73+#include <linux/rtc.h>
74+#include <linux/syscalls.h> /* sys_sync */
75+#include <linux/wakelock.h>
76+#include <linux/workqueue.h>
77+
78+#include "power.h"
79+
80+enum {
81+ DEBUG_USER_STATE = 1U << 0,
82+ DEBUG_SUSPEND = 1U << 2,
83+};
84+static int debug_mask = DEBUG_USER_STATE;
85+module_param_named(debug_mask, debug_mask, int, S_IRUGO | S_IWUSR | S_IWGRP);
86+
87+static DEFINE_MUTEX(early_suspend_lock);
88+static LIST_HEAD(early_suspend_handlers);
89+static void early_suspend(struct work_struct *work);
90+static void late_resume(struct work_struct *work);
91+static DECLARE_WORK(early_suspend_work, early_suspend);
92+static DECLARE_WORK(late_resume_work, late_resume);
93+static DEFINE_SPINLOCK(state_lock);
94+enum {
95+ SUSPEND_REQUESTED = 0x1,
96+ SUSPENDED = 0x2,
97+ SUSPEND_REQUESTED_AND_SUSPENDED = SUSPEND_REQUESTED | SUSPENDED,
98+};
99+static int state;
100+
101+void register_early_suspend(struct early_suspend *handler)
102+{
103+ struct list_head *pos;
104+
105+ mutex_lock(&early_suspend_lock);
106+ list_for_each(pos, &early_suspend_handlers) {
107+ struct early_suspend *e;
108+ e = list_entry(pos, struct early_suspend, link);
109+ if (e->level > handler->level)
110+ break;
111+ }
112+ list_add_tail(&handler->link, pos);
113+ if ((state & SUSPENDED) && handler->suspend)
114+ handler->suspend(handler);
115+ mutex_unlock(&early_suspend_lock);
116+}
117+EXPORT_SYMBOL(register_early_suspend);
118+
119+void unregister_early_suspend(struct early_suspend *handler)
120+{
121+ mutex_lock(&early_suspend_lock);
122+ list_del(&handler->link);
123+ mutex_unlock(&early_suspend_lock);
124+}
125+EXPORT_SYMBOL(unregister_early_suspend);
126+
127+static void early_suspend(struct work_struct *work)
128+{
129+ struct early_suspend *pos;
130+ unsigned long irqflags;
131+ int abort = 0;
132+
133+ mutex_lock(&early_suspend_lock);
134+ spin_lock_irqsave(&state_lock, irqflags);
135+ if (state == SUSPEND_REQUESTED)
136+ state |= SUSPENDED;
137+ else
138+ abort = 1;
139+ spin_unlock_irqrestore(&state_lock, irqflags);
140+
141+ if (abort) {
142+ if (debug_mask & DEBUG_SUSPEND)
143+ pr_info("early_suspend: abort, state %d\n", state);
144+ mutex_unlock(&early_suspend_lock);
145+ goto abort;
146+ }
147+
148+ if (debug_mask & DEBUG_SUSPEND)
149+ pr_info("early_suspend: call handlers\n");
150+ list_for_each_entry(pos, &early_suspend_handlers, link) {
151+ if (pos->suspend != NULL)
152+ pos->suspend(pos);
153+ }
154+ mutex_unlock(&early_suspend_lock);
155+
156+ if (debug_mask & DEBUG_SUSPEND)
157+ pr_info("early_suspend: sync\n");
158+
159+ sys_sync();
160+abort:
161+ spin_lock_irqsave(&state_lock, irqflags);
162+ if (state == SUSPEND_REQUESTED_AND_SUSPENDED)
163+ wake_unlock(&main_wake_lock);
164+ spin_unlock_irqrestore(&state_lock, irqflags);
165+}
166+
167+static void late_resume(struct work_struct *work)
168+{
169+ struct early_suspend *pos;
170+ unsigned long irqflags;
171+ int abort = 0;
172+
173+ mutex_lock(&early_suspend_lock);
174+ spin_lock_irqsave(&state_lock, irqflags);
175+ if (state == SUSPENDED)
176+ state &= ~SUSPENDED;
177+ else
178+ abort = 1;
179+ spin_unlock_irqrestore(&state_lock, irqflags);
180+
181+ if (abort) {
182+ if (debug_mask & DEBUG_SUSPEND)
183+ pr_info("late_resume: abort, state %d\n", state);
184+ goto abort;
185+ }
186+ if (debug_mask & DEBUG_SUSPEND)
187+ pr_info("late_resume: call handlers\n");
188+ list_for_each_entry_reverse(pos, &early_suspend_handlers, link)
189+ if (pos->resume != NULL)
190+ pos->resume(pos);
191+ if (debug_mask & DEBUG_SUSPEND)
192+ pr_info("late_resume: done\n");
193+abort:
194+ mutex_unlock(&early_suspend_lock);
195+}
196+
197+void request_suspend_state(suspend_state_t new_state)
198+{
199+ unsigned long irqflags;
200+ int old_sleep;
201+
202+ spin_lock_irqsave(&state_lock, irqflags);
203+ old_sleep = state & SUSPEND_REQUESTED;
204+ if (debug_mask & DEBUG_USER_STATE) {
205+ struct timespec ts;
206+ struct rtc_time tm;
207+ getnstimeofday(&ts);
208+ rtc_time_to_tm(ts.tv_sec, &tm);
209+ pr_info("request_suspend_state: %s (%d->%d) at %lld "
210+ "(%d-%02d-%02d %02d:%02d:%02d.%09lu UTC)\n",
211+ new_state != PM_SUSPEND_ON ? "sleep" : "wakeup",
212+ requested_suspend_state, new_state,
213+ ktime_to_ns(ktime_get()),
214+ tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday,
215+ tm.tm_hour, tm.tm_min, tm.tm_sec, ts.tv_nsec);
216+ }
217+ if (!old_sleep && new_state != PM_SUSPEND_ON) {
218+ state |= SUSPEND_REQUESTED;
219+ queue_work(suspend_work_queue, &early_suspend_work);
220+ } else if (old_sleep && new_state == PM_SUSPEND_ON) {
221+ state &= ~SUSPEND_REQUESTED;
222+ wake_lock(&main_wake_lock);
223+ queue_work(suspend_work_queue, &late_resume_work);
224+ }
225+ requested_suspend_state = new_state;
226+ spin_unlock_irqrestore(&state_lock, irqflags);
227+}
228+
229+suspend_state_t get_suspend_state(void)
230+{
231+ return requested_suspend_state;
232+}
233--- a/kernel/power/power.h
234+++ b/kernel/power/power.h
235@@ -230,3 +230,9 @@ extern struct workqueue_struct *suspend_
236 extern struct wake_lock main_wake_lock;
237 extern suspend_state_t requested_suspend_state;
238 #endif
239+
240+#ifdef CONFIG_EARLYSUSPEND
241+/* kernel/power/earlysuspend.c */
242+void request_suspend_state(suspend_state_t state);
243+suspend_state_t get_suspend_state(void);
244+#endif
245

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