PM: earlysuspend: Removing dependence on console.
Rebecca Schultz [Fri, 18 Jul 2008 01:14:55 +0000 (18:14 -0700)]
Rather than signaling a full update of the display from userspace via a
console switch, this patch introduces 2 files int /sys/power,
wait_for_fb_sleep and wait_for_fb_wake.  Reading these files will block
until the requested state has been entered.  When a read from
wait_for_fb_sleep returns userspace should stop drawing.  When
wait_for_fb_wake returns, it should do a full update.  If either are called
when the fb driver is already in the requested state, they will return
immediately.

Signed-off-by: Rebecca Schultz <rschultz@google.com>
Signed-off-by: Arve Hjønnevåg <arve@android.com>

kernel/power/Kconfig
kernel/power/Makefile
kernel/power/fbearlysuspend.c [new file with mode: 0644]

index eec7034..3a27c53 100644 (file)
@@ -61,6 +61,7 @@ config EARLYSUSPEND
 
 choice
        prompt "User-space screen access"
+       default FB_EARLYSUSPEND if !FRAMEBUFFER_CONSOLE
        default CONSOLE_EARLYSUSPEND
        depends on HAS_EARLYSUSPEND
 
@@ -74,6 +75,14 @@ choice
                  Register early suspend handler to perform a console switch to
                  when user-space should stop drawing to the screen and a switch
                  back when it should resume.
+
+       config FB_EARLYSUSPEND
+               bool "Sysfs interface"
+               depends on HAS_EARLYSUSPEND
+               ---help---
+                 Register early suspend handler that notifies and waits for
+                 user-space through sysfs when user-space should stop drawing
+                 to the screen and notifies user-space when it should resume.
 endchoice
 
 config HIBERNATE_CALLBACKS
index 0d1c5e4..493f19d 100644 (file)
@@ -12,5 +12,6 @@ obj-$(CONFIG_WAKELOCK)                += wakelock.o
 obj-$(CONFIG_USER_WAKELOCK)    += userwakelock.o
 obj-$(CONFIG_EARLYSUSPEND)     += earlysuspend.o
 obj-$(CONFIG_CONSOLE_EARLYSUSPEND)     += consoleearlysuspend.o
+obj-$(CONFIG_FB_EARLYSUSPEND)  += fbearlysuspend.o
 
 obj-$(CONFIG_MAGIC_SYSRQ)      += poweroff.o
diff --git a/kernel/power/fbearlysuspend.c b/kernel/power/fbearlysuspend.c
new file mode 100644 (file)
index 0000000..1513765
--- /dev/null
@@ -0,0 +1,153 @@
+/* kernel/power/fbearlysuspend.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/wait.h>
+
+#include "power.h"
+
+static wait_queue_head_t fb_state_wq;
+static DEFINE_SPINLOCK(fb_state_lock);
+static enum {
+       FB_STATE_STOPPED_DRAWING,
+       FB_STATE_REQUEST_STOP_DRAWING,
+       FB_STATE_DRAWING_OK,
+} fb_state;
+
+/* tell userspace to stop drawing, wait for it to stop */
+static void stop_drawing_early_suspend(struct early_suspend *h)
+{
+       int ret;
+       unsigned long irq_flags;
+
+       spin_lock_irqsave(&fb_state_lock, irq_flags);
+       fb_state = FB_STATE_REQUEST_STOP_DRAWING;
+       spin_unlock_irqrestore(&fb_state_lock, irq_flags);
+
+       wake_up_all(&fb_state_wq);
+       ret = wait_event_timeout(fb_state_wq,
+                                fb_state == FB_STATE_STOPPED_DRAWING,
+                                HZ);
+       if (unlikely(fb_state != FB_STATE_STOPPED_DRAWING))
+               pr_warning("stop_drawing_early_suspend: timeout waiting for "
+                          "userspace to stop drawing\n");
+}
+
+/* tell userspace to start drawing */
+static void start_drawing_late_resume(struct early_suspend *h)
+{
+       unsigned long irq_flags;
+
+       spin_lock_irqsave(&fb_state_lock, irq_flags);
+       fb_state = FB_STATE_DRAWING_OK;
+       spin_unlock_irqrestore(&fb_state_lock, irq_flags);
+       wake_up(&fb_state_wq);
+}
+
+static struct early_suspend stop_drawing_early_suspend_desc = {
+       .level = EARLY_SUSPEND_LEVEL_STOP_DRAWING,
+       .suspend = stop_drawing_early_suspend,
+       .resume = start_drawing_late_resume,
+};
+
+static ssize_t wait_for_fb_sleep_show(struct kobject *kobj,
+                                     struct kobj_attribute *attr, char *buf)
+{
+       char *s = buf;
+       int ret;
+
+       ret = wait_event_interruptible(fb_state_wq,
+                                      fb_state != FB_STATE_DRAWING_OK);
+       if (ret && fb_state == FB_STATE_DRAWING_OK)
+               return ret;
+       else
+               s += sprintf(buf, "sleeping");
+       return s - buf;
+}
+
+static ssize_t wait_for_fb_wake_show(struct kobject *kobj,
+                                    struct kobj_attribute *attr, char *buf)
+{
+       char *s = buf;
+       int ret;
+       unsigned long irq_flags;
+
+       spin_lock_irqsave(&fb_state_lock, irq_flags);
+       if (fb_state == FB_STATE_REQUEST_STOP_DRAWING) {
+               fb_state = FB_STATE_STOPPED_DRAWING;
+               wake_up(&fb_state_wq);
+       }
+       spin_unlock_irqrestore(&fb_state_lock, irq_flags);
+
+       ret = wait_event_interruptible(fb_state_wq,
+                                      fb_state == FB_STATE_DRAWING_OK);
+       if (ret && fb_state != FB_STATE_DRAWING_OK)
+               return ret;
+       else
+               s += sprintf(buf, "awake");
+
+       return s - buf;
+}
+
+#define power_ro_attr(_name) \
+static struct kobj_attribute _name##_attr = {  \
+       .attr   = {                             \
+               .name = __stringify(_name),     \
+               .mode = 0444,                   \
+       },                                      \
+       .show   = _name##_show,                 \
+       .store  = NULL,         \
+}
+
+power_ro_attr(wait_for_fb_sleep);
+power_ro_attr(wait_for_fb_wake);
+
+static struct attribute *g[] = {
+       &wait_for_fb_sleep_attr.attr,
+       &wait_for_fb_wake_attr.attr,
+       NULL,
+};
+
+static struct attribute_group attr_group = {
+       .attrs = g,
+};
+
+static int __init android_power_init(void)
+{
+       int ret;
+
+       init_waitqueue_head(&fb_state_wq);
+       fb_state = FB_STATE_DRAWING_OK;
+
+       ret = sysfs_create_group(power_kobj, &attr_group);
+       if (ret) {
+               pr_err("android_power_init: sysfs_create_group failed\n");
+               return ret;
+       }
+
+       register_early_suspend(&stop_drawing_early_suspend_desc);
+       return 0;
+}
+
+static void  __exit android_power_exit(void)
+{
+       unregister_early_suspend(&stop_drawing_early_suspend_desc);
+       sysfs_remove_group(power_kobj, &attr_group);
+}
+
+module_init(android_power_init);
+module_exit(android_power_exit);
+