staging: olpc_dcon: add OLPC display controller (DCON) support

This adds DCON support for the OLPC XO.  The DCON is found in XO-1 and
XO-1.5 hardware.  The XO-1 has a CS5536 southbridge, while the XO-1.5
has a Via chipset; the GPIO magic that's necessary to communicate with
the DCON chip is unfortunately different across both platforms.  This
driver supports both.

This driver is in bad state atm, so I'm requesting its inclusion into
staging so it can be cleaned up while staying in the kernel tree.

Original driver by Dave Woodhouse, and modified extensively by
Jordan Crouse, myself, Deepak Saxena, Paul Fox, Daniel Drake, and
probably others that I've missed.

Signed-off-by: Andres Salomon <dilinger@queued.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/staging/Kconfig

@@ -69,6 +69,8 @@ source "drivers/staging/rt2870/Kconfig"
 
 source "drivers/staging/comedi/Kconfig"
 
+source "drivers/staging/olpc_dcon/Kconfig"
+
 source "drivers/staging/asus_oled/Kconfig"
 
 source "drivers/staging/panel/Kconfig"

drivers/staging/Makefile

@@ -18,6 +18,7 @@ obj-$(CONFIG_BRCM80211)		+= brcm80211/
 obj-$(CONFIG_RT2860)		+= rt2860/
 obj-$(CONFIG_RT2870)		+= rt2870/
 obj-$(CONFIG_COMEDI)		+= comedi/
+obj-$(CONFIG_FB_OLPC_DCON)	+= olpc_dcon/
 obj-$(CONFIG_ASUS_OLED)		+= asus_oled/
 obj-$(CONFIG_PANEL)		+= panel/
 obj-$(CONFIG_R8187SE)		+= rtl8187se/

drivers/staging/olpc_dcon/Kconfig

@@ -0,0 +1,8 @@
+config FB_OLPC_DCON
+	tristate "One Laptop Per Child Display CONtroller support"
+	depends on OLPC
+	select I2C
+	---help---
+	  Add support for the OLPC XO DCON controller.  This controller is
+	  only available on OLPC platforms.   Unless you have one of these
+	  platforms, you will want to say 'N'.

drivers/staging/olpc_dcon/Makefile

@@ -0,0 +1 @@
+obj-$(CONFIG_FB_OLPC_DCON)	+= olpc_dcon.o