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>

include/linux/rfkill.h

@@ -64,7 +64,7 @@ struct rfkill_ops {
 	int	(*set_block)(void *data, bool blocked);
 };
 
-#if defined(CONFIG_RFKILL) || defined(CONFIG_RFKILL_MODULE)
+#if IS_ENABLED(CONFIG_RFKILL_FULL)
 /**
  * rfkill_alloc - allocate rfkill structure
  * @name: name of the struct -- the string is not copied internally

net/Makefile

@@ -52,7 +52,7 @@ obj-$(CONFIG_MAC80211)		+= mac80211/
 obj-$(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),)

net/rfkill/Kconfig

 #
 # 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 @@ menuconfig RFKILL
 # 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_REGULATOR
 
 config RFKILL_GPIO
 	tristate "GPIO RFKILL driver"
-	depends on RFKILL
+	depends on RFKILL_FULL
 	depends on GPIOLIB || COMPILE_TEST
 	default n
 	help

net/rfkill/Makefile

@@ -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