rfkill: add fake rfkill support

allow building of modules depending on RFKILL even if RFKILL is not enabled.

Signed-off-by: John Crispin <john@phrozen.org>

package/kernel/linux/modules/other.mk

@@ -398,7 +398,7 @@ define KernelPackage/rfkill
   TITLE:=RF switch subsystem support
   DEPENDS:=@USE_RFKILL +kmod-input-core
   KCONFIG:= \
-    CONFIG_RFKILL \
+    CONFIG_RFKILL_FULL \
     CONFIG_RFKILL_INPUT=y \
     CONFIG_RFKILL_LEDS=y \
     CONFIG_RFKILL_GPIO=y

target/linux/generic/patches-4.4/280-rfkill-stubs.patch

@@ -0,0 +1,87 @@
+Index: linux-4.4.21/net/rfkill/Kconfig
+===================================================================
+--- linux-4.4.21.orig/net/rfkill/Kconfig	2016-09-15 08:29:29.000000000 +0200
++++ linux-4.4.21/net/rfkill/Kconfig	2016-09-27 18:23:27.210404930 +0200
+@@ -1,7 +1,11 @@
+ #
+ # RF switch subsystem configuration
+ #
+-menuconfig RFKILL
++config RFKILL
++	bool
++	default y
++
++menuconfig RFKILL_FULL
+ 	tristate "RF switch subsystem support"
+ 	help
+ 	  Say Y here if you want to have control over RF switches
+@@ -13,19 +17,19 @@
+ # LED trigger support
+ config RFKILL_LEDS
+ 	bool
+-	depends on RFKILL
++	depends on RFKILL_FULL
+ 	depends on LEDS_TRIGGERS = y || RFKILL = LEDS_TRIGGERS
+ 	default y
+ 
+ config RFKILL_INPUT
+ 	bool "RF switch input support" if EXPERT
+-	depends on RFKILL
++	depends on RFKILL_FULL
+ 	depends on INPUT = y || RFKILL = INPUT
+ 	default y if !EXPERT
+ 
+ config RFKILL_REGULATOR
+ 	tristate "Generic rfkill regulator driver"
+-	depends on RFKILL || !RFKILL
++	depends on RFKILL_FULL || !RFKILL_FULL
+ 	depends on REGULATOR
+ 	help
+           This options enable controlling radio transmitters connected to
+@@ -36,7 +40,7 @@
+ 
+ config RFKILL_GPIO
+ 	tristate "GPIO RFKILL driver"
+-	depends on RFKILL
++	depends on RFKILL_FULL
+ 	depends on GPIOLIB || COMPILE_TEST
+ 	default n
+ 	help
+Index: linux-4.4.21/net/rfkill/Makefile
+===================================================================
+--- linux-4.4.21.orig/net/rfkill/Makefile	2016-09-15 08:29:29.000000000 +0200
++++ linux-4.4.21/net/rfkill/Makefile	2016-09-27 18:22:12.373010155 +0200
+@@ -4,6 +4,6 @@
+ 
+ rfkill-y			+= core.o
+ rfkill-$(CONFIG_RFKILL_INPUT)	+= input.o
+-obj-$(CONFIG_RFKILL)		+= rfkill.o
++obj-$(CONFIG_RFKILL_FULL)	+= rfkill.o
+ obj-$(CONFIG_RFKILL_REGULATOR)	+= rfkill-regulator.o
+ obj-$(CONFIG_RFKILL_GPIO)	+= rfkill-gpio.o
+Index: linux-4.4.21/net/Makefile
+===================================================================
+--- linux-4.4.21.orig/net/Makefile	2016-09-15 08:29:29.000000000 +0200
++++ linux-4.4.21/net/Makefile	2016-09-27 18:23:43.954773045 +0200
+@@ -49,7 +49,7 @@
+ obj-$(CONFIG_TIPC)		+= tipc/
+ obj-$(CONFIG_NETLABEL)		+= netlabel/
+ obj-$(CONFIG_IUCV)		+= iucv/
+-obj-$(CONFIG_RFKILL)		+= rfkill/
++obj-$(CONFIG_RFKILL_FULL)	+= rfkill/
+ obj-$(CONFIG_NET_9P)		+= 9p/
+ obj-$(CONFIG_CAIF)		+= caif/
+ ifneq ($(CONFIG_DCB),)
+Index: linux-4.4.21/include/linux/rfkill.h
+===================================================================
+--- linux-4.4.21.orig/include/linux/rfkill.h	2016-09-15 08:29:29.000000000 +0200
++++ linux-4.4.21/include/linux/rfkill.h	2016-09-27 18:47:20.426653801 +0200
+@@ -64,7 +64,7 @@
+ 	int	(*set_block)(void *data, bool blocked);
+ };
+ 
+-#if defined(CONFIG_RFKILL) || defined(CONFIG_RFKILL_MODULE)
++#if defined(CONFIG_RFKILL_FULL) || defined(CONFIG_RFKILL_FULL_MODULE)
+ /**
+  * rfkill_alloc - allocate rfkill structure
+  * @name: name of the struct -- the string is not copied internally