Adding upstream version 4.19.249.upstream/4.19.249upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

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+=======================================================
+xpad - Linux USB driver for Xbox compatible controllers
+=======================================================
+
+This driver exposes all first-party and third-party Xbox compatible
+controllers. It has a long history and has enjoyed considerable usage
+as Window's xinput library caused most PC games to focus on Xbox
+controller compatibility.
+
+Due to backwards compatibility all buttons are reported as digital.
+This only effects Original Xbox controllers. All later controller models
+have only digital face buttons.
+
+Rumble is supported on some models of Xbox 360 controllers but not of
+Original Xbox controllers nor on Xbox One controllers. As of writing
+the Xbox One's rumble protocol has not been reverse engineered but in
+the future could be supported.
+
+
+Notes
+=====
+
+The number of buttons/axes reported varies based on 3 things:
+
+- if you are using a known controller
+- if you are using a known dance pad
+- if using an unknown device (one not listed below), what you set in the
+  module configuration for "Map D-PAD to buttons rather than axes for unknown
+  pads" (module option dpad_to_buttons)
+
+If you set dpad_to_buttons to N and you are using an unknown device
+the driver will map the directional pad to axes (X/Y).
+If you said Y it will map the d-pad to buttons, which is needed for dance
+style games to function correctly. The default is Y.
+
+dpad_to_buttons has no effect for known pads. A erroneous commit message
+claimed dpad_to_buttons could be used to force behavior on known devices.
+This is not true. Both dpad_to_buttons and triggers_to_buttons only affect
+unknown controllers.
+
+
+Normal Controllers
+------------------
+
+With a normal controller, the directional pad is mapped to its own X/Y axes.
+The jstest-program from joystick-1.2.15 (jstest-version 2.1.0) will report 8
+axes and 10 buttons.
+
+All 8 axes work, though they all have the same range (-32768..32767)
+and the zero-setting is not correct for the triggers (I don't know if that
+is some limitation of jstest, since the input device setup should be fine. I
+didn't have a look at jstest itself yet).
+
+All of the 10 buttons work (in digital mode). The six buttons on the
+right side (A, B, X, Y, black, white) are said to be "analog" and
+report their values as 8 bit unsigned, not sure what this is good for.
+
+I tested the controller with quake3, and configuration and
+in game functionality were OK. However, I find it rather difficult to
+play first person shooters with a pad. Your mileage may vary.
+
+
+Xbox Dance Pads
+---------------
+
+When using a known dance pad, jstest will report 6 axes and 14 buttons.
+
+For dance style pads (like the redoctane pad) several changes
+have been made.  The old driver would map the d-pad to axes, resulting
+in the driver being unable to report when the user was pressing both
+left+right or up+down, making DDR style games unplayable.
+
+Known dance pads automatically map the d-pad to buttons and will work
+correctly out of the box.
+
+If your dance pad is recognized by the driver but is using axes instead
+of buttons, see section 0.3 - Unknown Controllers
+
+I've tested this with Stepmania, and it works quite well.
+
+
+Unknown Controllers
+-------------------
+
+If you have an unknown xbox controller, it should work just fine with
+the default settings.
+
+HOWEVER if you have an unknown dance pad not listed below, it will not
+work UNLESS you set "dpad_to_buttons" to 1 in the module configuration.
+
+
+USB adapters
+============
+
+All generations of Xbox controllers speak USB over the wire.
+
+- Original Xbox controllers use a proprietary connector and require adapters.
+- Wireless Xbox 360 controllers require a 'Xbox 360 Wireless Gaming Receiver
+  for Windows'
+- Wired Xbox 360 controllers use standard USB connectors.
+- Xbox One controllers can be wireless but speak Wi-Fi Direct and are not
+  yet supported.
+- Xbox One controllers can be wired and use standard Micro-USB connectors.
+
+
+
+Original Xbox USB adapters
+--------------------------
+
+Using this driver with an Original Xbox controller requires an
+adapter cable to break out the proprietary connector's pins to USB.
+You can buy these online fairly cheap, or build your own.
+
+Such a cable is pretty easy to build. The Controller itself is a USB
+compound device (a hub with three ports for two expansion slots and
+the controller device) with the only difference in a nonstandard connector
+(5 pins vs. 4 on standard USB 1.0 connectors).
+
+You just need to solder a USB connector onto the cable and keep the
+yellow wire unconnected. The other pins have the same order on both
+connectors so there is no magic to it. Detailed info on these matters
+can be found on the net ([1]_, [2]_, [3]_).
+
+Thanks to the trip splitter found on the cable you don't even need to cut the
+original one. You can buy an extension cable and cut that instead. That way,
+you can still use the controller with your X-Box, if you have one ;)
+
+
+
+Driver Installation
+===================
+
+Once you have the adapter cable, if needed, and the controller connected
+the xpad module should be auto loaded. To confirm you can cat
+/sys/kernel/debug/usb/devices. There should be an entry like those:
+
+.. code-block:: none
+   :caption: dump from InterAct PowerPad Pro (Germany)
+
+    T:  Bus=01 Lev=03 Prnt=04 Port=00 Cnt=01 Dev#=  5 Spd=12  MxCh= 0
+    D:  Ver= 1.10 Cls=00(>ifc ) Sub=00 Prot=00 MxPS=32 #Cfgs=  1
+    P:  Vendor=05fd ProdID=107a Rev= 1.00
+    C:* #Ifs= 1 Cfg#= 1 Atr=80 MxPwr=100mA
+    I:  If#= 0 Alt= 0 #EPs= 2 Cls=58(unk. ) Sub=42 Prot=00 Driver=(none)
+    E:  Ad=81(I) Atr=03(Int.) MxPS=  32 Ivl= 10ms
+    E:  Ad=02(O) Atr=03(Int.) MxPS=  32 Ivl= 10ms
+
+.. code-block:: none
+   :caption: dump from Redoctane Xbox Dance Pad (US)
+
+    T:  Bus=01 Lev=02 Prnt=09 Port=00 Cnt=01 Dev#= 10 Spd=12  MxCh= 0
+    D:  Ver= 1.10 Cls=00(>ifc ) Sub=00 Prot=00 MxPS= 8 #Cfgs=  1
+    P:  Vendor=0c12 ProdID=8809 Rev= 0.01
+    S:  Product=XBOX DDR
+    C:* #Ifs= 1 Cfg#= 1 Atr=80 MxPwr=100mA
+    I:  If#= 0 Alt= 0 #EPs= 2 Cls=58(unk. ) Sub=42 Prot=00 Driver=xpad
+    E:  Ad=82(I) Atr=03(Int.) MxPS=  32 Ivl=4ms
+    E:  Ad=02(O) Atr=03(Int.) MxPS=  32 Ivl=4ms
+
+
+Supported Controllers
+=====================
+
+For a full list of supported controllers and associated vendor and product
+IDs see the xpad_device[] array\ [4]_.
+
+As of the historic version 0.0.6 (2006-10-10) the following devices
+were supported::
+
+ original Microsoft XBOX controller (US),    vendor=0x045e, product=0x0202
+ smaller  Microsoft XBOX controller (US),    vendor=0x045e, product=0x0289
+ original Microsoft XBOX controller (Japan), vendor=0x045e, product=0x0285
+ InterAct PowerPad Pro (Germany),            vendor=0x05fd, product=0x107a
+ RedOctane Xbox Dance Pad (US),              vendor=0x0c12, product=0x8809
+
+Unrecognized models of Xbox controllers should function as Generic
+Xbox controllers. Unrecognized Dance Pad controllers require setting
+the module option 'dpad_to_buttons'.
+
+If you have an unrecognized controller please see 0.3 - Unknown Controllers
+
+
+Manual Testing
+==============
+
+To test this driver's functionality you may use 'jstest'.
+
+For example::
+
+    > modprobe xpad
+    > modprobe joydev
+    > jstest /dev/js0
+
+If you're using a normal controller, there should be a single line showing
+18 inputs (8 axes, 10 buttons), and its values should change if you move
+the sticks and push the buttons.  If you're using a dance pad, it should
+show 20 inputs (6 axes, 14 buttons).
+
+It works? Voila, you're done ;)
+
+
+
+Thanks
+======
+
+I have to thank ITO Takayuki for the detailed info on his site
+    http://euc.jp/periphs/xbox-controller.ja.html.
+
+His useful info and both the usb-skeleton as well as the iforce input driver
+(Greg Kroah-Hartmann; Vojtech Pavlik) helped a lot in rapid prototyping
+the basic functionality.
+
+
+
+References
+==========
+
+.. [1] http://euc.jp/periphs/xbox-controller.ja.html (ITO Takayuki)
+.. [2] http://xpad.xbox-scene.com/
+.. [3] http://www.markosweb.com/www/xboxhackz.com/
+.. [4] http://lxr.free-electrons.com/ident?i=xpad_device
+
+
+Historic Edits
+==============
+
+2002-07-16 - Marko Friedemann <mfr@bmx-chemnitz.de>
+ - original doc
+
+2005-03-19 - Dominic Cerquetti <binary1230@yahoo.com>
+ - added stuff for dance pads, new d-pad->axes mappings
+
+Later changes may be viewed with
+'git log --follow Documentation/input/devices/xpad.rst'