Add notes on which button is which on various controller setups.

button_maps/gamecube.wii-u-gc-adapter

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+# wii-u-gc-adapter
+
+Driver version is 2.1.0.
+Joystick (Wii U GameCube Adapter Port #) has 6 axes (X, Y, Z, Rx, Ry, Rz)
+and 12 buttons (BtnA, BtnB, BtnX, BtnY, BtnTL, BtnTR, BtnTR2, BtnStart, (null), (null), (null), (null)).
+Testing ... (interrupt to exit)
+Axes:  0:  -919  1:     0  2:-32767  3:  3715  4:     0  5:-32767 Buttons:  0:off  1:off  2:off  3:off  4:off  5:off  6:off  7:off  8:off  9:off 10:off 11:off 
+
+Axes:
+  0,1: primary (left) stick X,Y
+  2: L (left bumper) (-32767 is default, ~25000 is up to the click, 32767 is pressed in all the way)
+  3,4: secondary (right, C) stick X,Y
+  5: R (right bumper)
+
+Buttons:
+  0: A (bottom)
+  1: X (right)
+  2: Y (top)
+  3: B (left)
+  4: L click (after analog part)
+  5: R click (after analog part)
+  6: Z (R2)
+  7: start
+  8: d-pad up
+  9: d-pad down
+ 10: d-pad left
+ 11: d-pad right
+

button_maps/xbox360.xboxdrv

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+# xboxdrv (default)
+
+Driver version is 2.1.0.
+Joystick (Xbox Gamepad (userspace driver)) has 8 axes (X, Y, Rx, Ry, Gas, Brake, Hat0X, Hat0Y)
+and 11 buttons (BtnA, BtnB, BtnX, BtnY, BtnTL, BtnTR, BtnSelect, BtnStart, BtnMode, BtnThumbL, BtnThumbR).
+Testing ... (interrupt to exit)
+Axes:  0:     0  1:     0  2:     0  3:     0  4:-32767  5:-32767  6:     0  7:     0 Buttons:  0:off  1:off  2:off  3:off  4:off  5:off  6:off  7:off  8:off  9:off 10:off 
+
+Axes:
+  0,1: primary (left) stick X,Y
+  2,3: secondary (right) stick X,Y
+  4: RT (right bumper)
+  5: LT (left bumper) (-32767 is default, 32767 is pressed in all the way)
+  6,7: d-pad X,Y (digital, only ever min/max values or 0)
+
+Buttons:
+  0: A (bottom)
+  1: B (right)
+  2: X (left)
+  3: Y (top)
+  4: LB
+  5: RB
+  6: back
+  7: start
+  8: guide (center XBox button)
+  9: primary (left) stick press in (L3/TL)
+ 10: secondary (right) stick press in (R3/TR)

button_maps/xbox360.xboxdrv-mimic-xpad

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+# xboxdrv --mimic-xpad
+
+Driver version is 2.1.0.
+Joystick (Microsoft X-Box 360 pad) has 8 axes (X, Y, Z, Rx, Ry, Rz, Hat0X, Hat0Y)
+and 11 buttons (BtnA, BtnB, BtnX, BtnY, BtnTL, BtnTR, BtnSelect, BtnStart, BtnMode, BtnThumbL, BtnThumbR).
+Testing ... (interrupt to exit)
+Axes:  0:     0  1:     0  2:     0  3:     0  4:-32767  5:-32767  6:     0  7:     0 Buttons:  0:off  1:off  2:off  3:off  4:off  5:off  6:off  7:off  8:off  9:off 10:off 
+
+Axes:
+  0,1: primary (left) stick X,Y
+  2: LT (left bumper) (-32767 is default, 32767 is pressed in all the way)
+  3,4: secondary (right) stick X,Y
+  5: RT (right bumper)
+  6,7: d-pad X,Y (digital, only ever min/max values or 0)
+
+Buttons:
+  0: A (bottom)
+  1: B (right)
+  2: X (left)
+  3: Y (top)
+  4: LB
+  5: RB
+  6: back
+  7: start
+  8: guide (center XBox button)
+  9: primary (left) stick press in (L3/TL)
+ 10: secondary (right) stick press in (R3/TR)

button_maps/xbox360.xboxdrv-mimic-xpad-wireless

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+# xboxdrv --mimic-xpad-wireless
+
+Driver version is 2.1.0.
+Joystick (Xbox 360 Wireless Receiver) has 6 axes (X, Y, Z, Rx, Ry, Rz)
+and 15 buttons (BtnA, BtnB, BtnX, BtnY, BtnTL, BtnTR, BtnSelect, BtnStart, BtnMode, BtnThumbL, BtnThumbR, (null), (null), (null), (null)).
+Testing ... (interrupt to exit)
+Axes:  0:     0  1:     0  2:-32767  3:     0  4:     0  5:-32767 Buttons:  0:off  1:off  2:off  3:off  4:off  5:off  6:off  7:off  8:off  9:off 10:off 11:off 12:off 13:off 14:off 
+
+Axes:
+  0,1: primary (left) stick X,Y
+  2: LT (left bumper) (-32767 is default, 32767 is pressed in all the way)
+  3,4: secondary (right) stick X,Y
+  5: RT (right bumper)
+
+Buttons:
+  0: A (bottom)
+  1: B (right)
+  2: X (left)
+  3: Y (top)
+  4: LB
+  5: RB
+  6: back
+  7: start
+  8: guide (center XBox button)
+  9: primary (left) stick press in (L3/TL)
+ 10: secondary (right) stick press in (R3/TR)
+ 11: d-pad left
+ 12: d-pad right
+ 13: d-pad up
+ 14: d-pad down

button_maps/xbox360.xpad

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+# Kernel driver (xpad)
+
+Driver version is 2.1.0.
+Joystick (Xbox 360 Wireless Receiver (XBOX)) has 8 axes (X, Y, Z, Rx, Ry, Rz, Hat0X, Hat0Y)
+and 15 buttons (BtnA, BtnB, BtnX, BtnY, BtnTL, BtnTR, BtnSelect, BtnStart, BtnMode, BtnThumbL, BtnThumbR, (null), (null), (null), (null)).
+Testing ... (interrupt to exit)
+Axes:  0: -5122  1:  -505  2:-32767  3: -2525  4: -2302  5:-32767  6:     0  7:     0 Buttons:  0:off  1:off  2:off  3:off  4:off  5:off  6:off  7:off  8:off  9:off 10:off 11:off 12:off 13:off 14:off 
+
+Axes:
+  0,1: primary (left) stick X,Y
+  2: LT (left bumper) (-32767 is default, 32767 is pressed in all the way)
+  3,4: secondary (right) stick X,Y
+  5: RT (right bumper)
+  6,7: d-pad X,Y (digital, only ever min/max values or 0)
+
+Buttons:
+  0: A (bottom)
+  1: B (right)
+  2: X (left)
+  3: Y (top)
+  4: LB
+  5: RB
+  6: back
+  7: start
+  8: guide (center XBox button)
+  9: primary (left) stick press in (L3/TL)
+ 10: secondary (right) stick press in (R3/TR)
+ 11: d-pad left
+ 12: d-pad right
+ 13: d-pad up
+ 14: d-pad down

gcn

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+#!/usr/bin/sh
+# Select a GameCube controller connected via wii-u-gc-adapter by pressing a
+#   button on it. Make that controller act like an XBox 360 controller.
+xboxdrv --evdev "$(identify_evdev.py)" --evdev-keymap "KEY_#304=a,KEY_#313=rt,KEY_#546=dl,KEY_#308=b,KEY_#310=lb,KEY_#545=dd,KEY_#315=start,KEY_#311=rb,KEY_#307=y,KEY_#305=x,KEY_#544=du,KEY_#547=dr" --evdev-absmap "ABS_RZ=rt,ABS_RY=y2,ABS_RX=x2,ABS_Z=lt,ABS_Y=y1,ABS_X=x1" --axismap "-rt=rt,-y2=y2,-lt=lt,-y1=y1" --mimic-xpad --silent