HID: add framebuffer support to PicoLCD device

Add framebuffer support to PicoLCD device with use of deferred-io.

Only changed areas of framebuffer get sent to device in order to
save USB bandwidth and especially resources on PicoLCD device or
allow higher refresh rate for a small area. Changed tiles are
determined while updating shadow framebuffer.

Signed-off-by: Bruno Prémont <bonbons@linux-vserver.org>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

Documentation/ABI/testing/sysfs-driver-hid-picolcd

@@ -15,3 +15,20 @@ Description:	Make it possible to switch the PicoLCD device between LCD
 		disconnected and reconnects after above delay (default value
 		is 5 seconds though this default should not be relied on).
 
+
+What:		/sys/bus/usb/devices/<busnum>-<devnum>:<config num>.<interface num>/<hid-bus>:<vendor-id>:<product-id>.<num>/fb_update_rate
+Date:		March 2010
+Contact:	Bruno Prémont <bonbons@linux-vserver.org>
+Description:	Make it possible to adjust defio refresh rate.
+
+		Reading: returns list of available refresh rates (expressed in Hz),
+		the active refresh rate being enclosed in brackets ('[' and ']')
+
+		Writing: accepts new refresh rate expressed in integer Hz
+		within permitted rates.
+
+		Note: As device can barely do 2 complete refreshes a second
+		it only makes sense to adjust this value if only one or two
+		tiles get changed and it's not appropriate to expect the application
+		to flush it's tiny changes explicitely at higher than default rate.
+

drivers/hid/Kconfig

@@ -265,15 +265,20 @@ config HID_PETALYNX
 config HID_PICOLCD
 	tristate "PicoLCD (graphic version)"
 	depends on USB_HID
+	select FB_DEFERRED_IO if FB
+	select FB_SYS_FILLRECT if FB
+	select FB_SYS_COPYAREA if FB
+	select FB_SYS_IMAGEBLIT if FB
+	select FB_SYS_FOPS if FB
 	---help---
 	  This provides support for Minibox PicoLCD devices, currently
 	  only the graphical ones are supported.
 
 	  This includes support for the following device features:
 	  - Keypad
 	  - Switching between Firmware and Flash mode
-	  Features that are not (yet) supported:
 	  - Framebuffer for monochrome 256x64 display
+	  Features that are not (yet) supported:
 	  - Backlight control
 	  - Contrast control
 	  - IR