misc: add dell-laptop driver

Add a driver for controlling Dell-specific backlight and rfkill interfaces.
This driver makes use of the dcdbas interface to the Dell firmware to
allow the backlight and rfkill interfaces on Dell systems to be driven
through the standardised sysfs interfaces.

Signed-off-by: Matthew Garrett <[email protected]>
Cc: Matt Domsch <[email protected]>
Cc: Ivo van Doorn <[email protected]>
Cc: Len Brown <[email protected]>
Cc: Richard Purdie <[email protected]>
Cc: Henrique de Moraes Holschuh <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

Author: mjg59

MAINTAINERS

@@ -1360,6 +1360,11 @@ P:	Maciej W. Rozycki
 M:	[email protected]
 S:	Maintained
 
+DELL LAPTOP DRIVER
+P:	Matthew Garrett
+M:	[email protected]
+S:	Maintained
+
 DELL LAPTOP SMM DRIVER
 P:	Massimo Dal Zotto
 M:	[email protected]

drivers/misc/Kconfig

@@ -498,6 +498,18 @@ config SGI_GRU_DEBUG
 	This option enables addition debugging code for the SGI GRU driver. If
 	you are unsure, say N.
 
+config DELL_LAPTOP
+	tristate "Dell Laptop Extras (EXPERIMENTAL)"
+	depends on X86
+	depends on DCDBAS
+	depends on EXPERIMENTAL
+	depends on BACKLIGHT_CLASS_DEVICE
+	depends on RFKILL
+	default n
+	---help---
+	This driver adds support for rfkill and backlight control to Dell
+	laptops.
+
 source "drivers/misc/c2port/Kconfig"
 
 endif # MISC_DEVICES

drivers/misc/Makefile

@@ -18,6 +18,7 @@ obj-$(CONFIG_ICS932S401)	+= ics932s401.o
 obj-$(CONFIG_TC1100_WMI)	+= tc1100-wmi.o
 obj-$(CONFIG_LKDTM)		+= lkdtm.o
 obj-$(CONFIG_TIFM_CORE)       	+= tifm_core.o
+obj-$(CONFIG_DELL_LAPTOP)	+= dell-laptop.o
 obj-$(CONFIG_TIFM_7XX1)       	+= tifm_7xx1.o
 obj-$(CONFIG_PHANTOM)		+= phantom.o
 obj-$(CONFIG_SGI_IOC4)		+= ioc4.o