PM: earlysuspend: Removing dependence on console.
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>
diff --git a/kernel/power/Kconfig b/kernel/power/Kconfig
index 625d653..a70f6c8 100644
--- a/kernel/power/Kconfig
+++ b/kernel/power/Kconfig
@@ -61,6 +61,7 @@
choice
prompt "User-space screen access"
+ default FB_EARLYSUSPEND if !FRAMEBUFFER_CONSOLE
default CONSOLE_EARLYSUSPEND
depends on HAS_EARLYSUSPEND
@@ -74,6 +75,14 @@
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