rfkill: rewrite

This patch completely rewrites the rfkill core to address
the following deficiencies:

 * all rfkill drivers need to implement polling where necessary
   rather than having one central implementation

 * updating the rfkill state cannot be done from arbitrary
   contexts, forcing drivers to use schedule_work and requiring
   lots of code

 * rfkill drivers need to keep track of soft/hard blocked
   internally -- the core should do this

 * the rfkill API has many unexpected quirks, for example being
   asymmetric wrt. alloc/free and register/unregister

 * rfkill can call back into a driver from within a function the
   driver called -- this is prone to deadlocks and generally
   should be avoided

 * rfkill-input pointlessly is a separate module

 * drivers need to #ifdef rfkill functions (unless they want to
   depend on or select RFKILL) -- rfkill should provide inlines
   that do nothing if it isn't compiled in

 * the rfkill structure is not opaque -- drivers need to initialise
   it correctly (lots of sanity checking code required) -- instead
   force drivers to pass the right variables to rfkill_alloc()

 * the documentation is hard to read because it always assumes the
   reader is completely clueless and contains way TOO MANY CAPS

 * the rfkill code needlessly uses a lot of locks and atomic
   operations in locked sections

 * fix LED trigger to actually change the LED when the radio state
   changes -- this wasn't done before

Tested-by: Alan Jenkins <alan-jenkins@tuffmail.co.uk>
Signed-off-by: Henrique de Moraes Holschuh <hmh@hmh.eng.br> [thinkpad]
Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

net/wimax/Kconfig

@@ -1,23 +1,9 @@
 #
 # WiMAX LAN device configuration
 #
-# Note the ugly 'depends on' on WIMAX: that disallows RFKILL to be a
-# module if WIMAX is to be linked in. The WiMAX code is done in such a
-# way that it doesn't require and explicit dependency on RFKILL in
-# case an embedded system wants to rip it out.
-#
-# As well, enablement of the RFKILL code means we need the INPUT layer
-# support to inject events coming from hw rfkill switches. That
-# dependency could be killed if input.h provided appropriate means to
-# work when input is disabled.
-
-comment "WiMAX Wireless Broadband support requires CONFIG_INPUT enabled"
-	depends on INPUT = n && RFKILL != n
 
 menuconfig WIMAX
 	tristate "WiMAX Wireless Broadband support"
-	depends on (y && RFKILL != m) || m
-	depends on (INPUT && RFKILL != n) || RFKILL = n
 	help
 
 	  Select to configure support for devices that provide