Input: xpad - add support for leds on xbox 360 pad

Export LEDs on Xbox360 pad via led subsystem as a single device in
/sys/class/leds/xpad[0-9]+.

Xbox360 pad has four leds, which form a circle. Unfortunately the leds
can't be controlled independently and can only display a predefined
set of patterns (for example one is turned on wile others are off or
a rotating pattern - 1-2-3-4). To activate a pattern one needs to send
a specific command to the device (see http://www.free60.org/wiki/Gamepad).

Led subsystem allows us to set brightness, but there is nothing like
brightness on this device. So brightness is actually interpreted as
the command (only values between 0 and 14 are accepted).

Signed-off-by: Jan Kratochvil <honza@jikos.cz>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>

1 files changed, 7 insertions, 0 deletions

diff --git a/drivers/input/joystick/Kconfig b/drivers/input/joystick/Kconfig
index 12db72d83ea0..e2abe18e575d 100644
--- a/drivers/input/joystick/Kconfig
+++ b/drivers/input/joystick/Kconfig
@@ -275,4 +275,11 @@ config JOYSTICK_XPAD_FF
         ---help---
           Say Y here if you want to take advantage of xbox 360 rumble features.
 
+config JOYSTICK_XPAD_LEDS
+        bool "LED Support for Xbox360 controller 'BigX' LED"
+        depends on LEDS_CLASS && JOYSTICK_XPAD
+        ---help---
+          This option enables support for the LED which surrounds the Big X on
+          XBox 360 controller.
+
 endif