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218 lines
6.3 KiB
Diff
218 lines
6.3 KiB
Diff
From ba801aa66e869f1f9f9d3a1610a2165baa024e4b Mon Sep 17 00:00:00 2001
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From: Rebecca Schultz <rschultz@google.com>
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Date: Thu, 17 Jul 2008 18:14:55 -0700
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Subject: [PATCH 072/134] PM: earlysuspend: Removing dependence on console.
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MIME-Version: 1.0
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Content-Type: text/plain; charset=utf-8
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Content-Transfer-Encoding: 8bit
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Rather than signaling a full update of the display from userspace via a
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console switch, this patch introduces 2 files int /sys/power,
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wait_for_fb_sleep and wait_for_fb_wake. Reading these files will block
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until the requested state has been entered. When a read from
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wait_for_fb_sleep returns userspace should stop drawing. When
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wait_for_fb_wake returns, it should do a full update. If either are called
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when the fb driver is already in the requested state, they will return
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immediately.
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Signed-off-by: Rebecca Schultz <rschultz@google.com>
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Signed-off-by: Arve Hjønnevåg <arve@android.com>
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---
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kernel/power/Kconfig | 9 +++
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kernel/power/Makefile | 1 +
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kernel/power/fbearlysuspend.c | 153 +++++++++++++++++++++++++++++++++++++++++
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3 files changed, 163 insertions(+), 0 deletions(-)
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create mode 100644 kernel/power/fbearlysuspend.c
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--- a/kernel/power/Kconfig
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+++ b/kernel/power/Kconfig
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@@ -159,6 +159,7 @@ config EARLYSUSPEND
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choice
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prompt "User-space screen access"
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+ default FB_EARLYSUSPEND if !FRAMEBUFFER_CONSOLE
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default CONSOLE_EARLYSUSPEND
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depends on HAS_EARLYSUSPEND
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@@ -172,6 +173,14 @@ choice
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Register early suspend handler to perform a console switch to
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when user-space should stop drawing to the screen and a switch
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back when it should resume.
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+
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+ config FB_EARLYSUSPEND
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+ bool "Sysfs interface"
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+ depends on HAS_EARLYSUSPEND
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+ ---help---
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+ Register early suspend handler that notifies and waits for
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+ user-space through sysfs when user-space should stop drawing
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+ to the screen and notifies user-space when it should resume.
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endchoice
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config HIBERNATION
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--- a/kernel/power/Makefile
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+++ b/kernel/power/Makefile
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@@ -10,6 +10,7 @@ obj-$(CONFIG_WAKELOCK) += wakelock.o
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obj-$(CONFIG_USER_WAKELOCK) += userwakelock.o
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obj-$(CONFIG_EARLYSUSPEND) += earlysuspend.o
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obj-$(CONFIG_CONSOLE_EARLYSUSPEND) += consoleearlysuspend.o
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+obj-$(CONFIG_FB_EARLYSUSPEND) += fbearlysuspend.o
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obj-$(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/fbearlysuspend.c
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@@ -0,0 +1,153 @@
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+/* kernel/power/fbearlysuspend.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/wait.h>
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+
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+#include "power.h"
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+
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+static wait_queue_head_t fb_state_wq;
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+static DEFINE_SPINLOCK(fb_state_lock);
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+static enum {
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+ FB_STATE_STOPPED_DRAWING,
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+ FB_STATE_REQUEST_STOP_DRAWING,
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+ FB_STATE_DRAWING_OK,
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+} fb_state;
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+
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+/* tell userspace to stop drawing, wait for it to stop */
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+static void stop_drawing_early_suspend(struct early_suspend *h)
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+{
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+ int ret;
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+ unsigned long irq_flags;
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+
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+ spin_lock_irqsave(&fb_state_lock, irq_flags);
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+ fb_state = FB_STATE_REQUEST_STOP_DRAWING;
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+ spin_unlock_irqrestore(&fb_state_lock, irq_flags);
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+
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+ wake_up_all(&fb_state_wq);
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+ ret = wait_event_timeout(fb_state_wq,
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+ fb_state == FB_STATE_STOPPED_DRAWING,
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+ HZ);
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+ if (unlikely(fb_state != FB_STATE_STOPPED_DRAWING))
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+ pr_warning("stop_drawing_early_suspend: timeout waiting for "
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+ "userspace to stop drawing\n");
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+}
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+
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+/* tell userspace to start drawing */
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+static void start_drawing_late_resume(struct early_suspend *h)
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+{
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+ unsigned long irq_flags;
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+
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+ spin_lock_irqsave(&fb_state_lock, irq_flags);
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+ fb_state = FB_STATE_DRAWING_OK;
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+ spin_unlock_irqrestore(&fb_state_lock, irq_flags);
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+ wake_up(&fb_state_wq);
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+}
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+
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+static struct early_suspend stop_drawing_early_suspend_desc = {
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+ .level = EARLY_SUSPEND_LEVEL_STOP_DRAWING,
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+ .suspend = stop_drawing_early_suspend,
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+ .resume = start_drawing_late_resume,
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+};
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+
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+static ssize_t wait_for_fb_sleep_show(struct kobject *kobj,
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+ struct kobj_attribute *attr, char *buf)
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+{
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+ char *s = buf;
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+ int ret;
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+
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+ ret = wait_event_interruptible(fb_state_wq,
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+ fb_state != FB_STATE_DRAWING_OK);
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+ if (ret && fb_state == FB_STATE_DRAWING_OK)
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+ return ret;
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+ else
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+ s += sprintf(buf, "sleeping");
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+ return s - buf;
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+}
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+
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+static ssize_t wait_for_fb_wake_show(struct kobject *kobj,
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+ struct kobj_attribute *attr, char *buf)
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+{
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+ char *s = buf;
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+ int ret;
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+ unsigned long irq_flags;
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+
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+ spin_lock_irqsave(&fb_state_lock, irq_flags);
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+ if (fb_state == FB_STATE_REQUEST_STOP_DRAWING) {
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+ fb_state = FB_STATE_STOPPED_DRAWING;
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+ wake_up(&fb_state_wq);
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+ }
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+ spin_unlock_irqrestore(&fb_state_lock, irq_flags);
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+
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+ ret = wait_event_interruptible(fb_state_wq,
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+ fb_state == FB_STATE_DRAWING_OK);
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+ if (ret && fb_state != FB_STATE_DRAWING_OK)
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+ return ret;
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+ else
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+ s += sprintf(buf, "awake");
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+
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+ return s - buf;
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+}
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+
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+#define power_ro_attr(_name) \
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+static struct kobj_attribute _name##_attr = { \
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+ .attr = { \
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+ .name = __stringify(_name), \
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+ .mode = 0444, \
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+ }, \
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+ .show = _name##_show, \
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+ .store = NULL, \
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+}
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+
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+power_ro_attr(wait_for_fb_sleep);
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+power_ro_attr(wait_for_fb_wake);
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+
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+static struct attribute *g[] = {
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+ &wait_for_fb_sleep_attr.attr,
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+ &wait_for_fb_wake_attr.attr,
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+ NULL,
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+};
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+
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+static struct attribute_group attr_group = {
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+ .attrs = g,
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+};
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+
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+static int __init android_power_init(void)
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+{
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+ int ret;
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+
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+ init_waitqueue_head(&fb_state_wq);
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+ fb_state = FB_STATE_DRAWING_OK;
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+
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+ ret = sysfs_create_group(power_kobj, &attr_group);
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+ if (ret) {
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+ pr_err("android_power_init: sysfs_create_group failed\n");
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+ return ret;
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+ }
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+
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+ register_early_suspend(&stop_drawing_early_suspend_desc);
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+ return 0;
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+}
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+
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+static void __exit android_power_exit(void)
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+{
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+ unregister_early_suspend(&stop_drawing_early_suspend_desc);
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+ sysfs_remove_group(power_kobj, &attr_group);
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+}
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+
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+module_init(android_power_init);
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+module_exit(android_power_exit);
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+
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