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>

1 files changed, 7 insertions, 14 deletions

diff --git a/net/rfkill/Kconfig b/net/rfkill/Kconfig
index 7f807b30cfbb..b47f72fae05d 100644
--- a/net/rfkill/Kconfig
+++ b/net/rfkill/Kconfig
@@ -10,22 +10,15 @@ menuconfig RFKILL
           To compile this driver as a module, choose M here: the
           module will be called rfkill.
 
-config RFKILL_INPUT
-        tristate "Input layer to RF switch connector"
-        depends on RFKILL && INPUT
-        help
-          Say Y here if you want kernel automatically toggle state
-          of RF switches on and off when user presses appropriate
-          button or a key on the keyboard. Without this module you
-          need a some kind of userspace application to control
-          state of the switches.
-
-          To compile this driver as a module, choose M here: the
-          module will be called rfkill-input.
-
 # LED trigger support
 config RFKILL_LEDS
         bool
-        depends on RFKILL && LEDS_TRIGGERS
+        depends on RFKILL
+        depends on LEDS_TRIGGERS = y || RFKILL = LEDS_TRIGGERS
         default y
 
+config RFKILL_INPUT
+        bool
+        depends on RFKILL
+        depends on INPUT = y || RFKILL = INPUT
+        default y