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, 6 insertions, 8 deletions

diff --git a/drivers/platform/x86/Kconfig b/drivers/platform/x86/Kconfig
index 284ebaca6e4..c682ac53641 100644
--- a/drivers/platform/x86/Kconfig
+++ b/drivers/platform/x86/Kconfig
@@ -21,7 +21,7 @@ config ACER_WMI
 	depends on NEW_LEDS
 	depends on BACKLIGHT_CLASS_DEVICE
 	depends on SERIO_I8042
-	depends on RFKILL
+	depends on RFKILL || RFKILL = n
 	select ACPI_WMI
 	---help---
 	  This is a driver for newer Acer (and Wistron) laptops. It adds
@@ -60,7 +60,7 @@ config DELL_LAPTOP
 	depends on DCDBAS
 	depends on EXPERIMENTAL
 	depends on BACKLIGHT_CLASS_DEVICE
-	depends on RFKILL
+	depends on RFKILL || RFKILL = n
 	depends on POWER_SUPPLY
 	default n
 	---help---
@@ -117,7 +117,7 @@ config HP_WMI
 	tristate "HP WMI extras"
 	depends on ACPI_WMI
 	depends on INPUT
-	depends on RFKILL
+	depends on RFKILL || RFKILL = n
 	help
 	 Say Y here if you want to support WMI-based hotkeys on HP laptops and
 	 to read data from WMI such as docking or ambient light sensor state.
@@ -196,14 +196,13 @@ config THINKPAD_ACPI
 	tristate "ThinkPad ACPI Laptop Extras"
 	depends on ACPI
 	depends on INPUT
+	depends on RFKILL || RFKILL = n
 	select BACKLIGHT_LCD_SUPPORT
 	select BACKLIGHT_CLASS_DEVICE
 	select HWMON
 	select NVRAM
 	select NEW_LEDS
 	select LEDS_CLASS
-	select NET
-	select RFKILL
 	---help---
 	  This is a driver for the IBM and Lenovo ThinkPad laptops. It adds
 	  support for Fn-Fx key combinations, Bluetooth control, video
@@ -338,9 +337,9 @@ config EEEPC_LAPTOP
 	depends on ACPI
 	depends on INPUT
 	depends on EXPERIMENTAL
+	depends on RFKILL || RFKILL = n
 	select BACKLIGHT_CLASS_DEVICE
 	select HWMON
-	select RFKILL
 	---help---
 	  This driver supports the Fn-Fx keys on Eee PC laptops.
 	  It also adds the ability to switch camera/wlan on/off.
@@ -405,9 +404,8 @@ config ACPI_TOSHIBA
 	tristate "Toshiba Laptop Extras"
 	depends on ACPI
 	depends on INPUT
+	depends on RFKILL || RFKILL = n
 	select INPUT_POLLDEV
-	select NET
-	select RFKILL
 	select BACKLIGHT_CLASS_DEVICE
 	---help---
 	  This driver adds support for access to certain system settings