Support for Nacon Pro Compact

.github/pull_request_template.md

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+<!--
+If you are adding support for a new generic xpad controller it is sufficient
+to update the xpad_table[] array.
+The type will be auto-detected in xpad_probe().
+Updating the xpad_device[] array is only needed if the controller requires
+additional flags like DANCEPAD_MAP_CONFIG to work.
+
+If you are updating any of the above tables, make sure you keep the sorted!
+
+To get attribution for your work when this goes upstream, make sure to use
+a real name and a real email address as per:
+https://www.kernel.org/doc/html/v4.10/process/submitting-patches.html#sign-your-work-the-developer-s-certificate-of-origin
+ -->

.github/workflows/ci-build.yml

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+name: CI Build
+on: 
+  push:
+    branches: [master]
+  pull_request:
+    branches: [master]
+jobs:
+  linux:
+    runs-on: ubuntu-22.04
+    steps:
+    - name: Install Dependencies
+      run: |
+        sudo apt update
+        sudo apt install -y dkms
+    - uses: actions/checkout@v2
+    - name: Build
+      run: |
+        sudo ln -s `pwd` /usr/src/xpad-0.4
+        sudo dkms install -m xpad -v 0.4

README.md

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+# Updated Xpad Linux Kernel Driver
+Driver for the Xbox/ Xbox 360/ Xbox 360 Wireless/ Xbox One Controllers
+
+This driver includes the latest changes in the upstream linux kernel and additionally carries the following staging changes:
+
+* support for more compatible devices
+* support for xbox360 class controllers, that need initialisation
+* support for xbox one elite paddles
+* xpad360w: power-off by long-pressing the power button
+
+## Xbox One Controllers
+This driver is only used if you connect the controller via USB.
+
+**Connecting via Bluetooth**  
+If you get past the pairing issues, the controller will operate in the [generic-HID bluetooth profile](https://en.wikipedia.org/wiki/List_of_Bluetooth_profiles#Human_Interface_Device_Profile_(HID)).  
+The xpad driver will not be used.
+
+**Connecting via XBox One Wireless Adapter (WiFi)**  
+The adapter needs daemon in userspace, see: [medusalix/xow](https://github.com/medusalix/xow)  
+Opinion: rather get a controller that supports bluetooth.
+
+
+# Installing
+```
+sudo git clone https://github.com/paroj/xpad.git /usr/src/xpad-0.4
+sudo dkms install -m xpad -v 0.4
+```
+# Updating
+```
+cd /usr/src/xpad-0.4
+sudo git fetch
+sudo git checkout origin/master
+sudo dkms remove -m xpad -v 0.4 --all
+sudo dkms install -m xpad -v 0.4
+```
+# Removing
+```
+sudo dkms remove -m xpad -v 0.4 --all
+sudo rm -rf /usr/src/xpad-0.4
+```
+# Usage
+This driver creates three devices for each attached gamepad
+
+1. /dev/input/js**N**
+    * example `jstest /dev/input/js0`
+2. /sys/class/leds/xpad**N**/brightness
+    * example `echo COMMAND > /sys/class/leds/xpad0/brightness` where COMMAND is one of
+        *  0: off
+        *  1: all blink, then previous setting
+        *  2: 1/top-left blink, then on
+        *  3: 2/top-right blink, then on
+        *  4: 3/bottom-left blink, then on
+        *  5: 4/bottom-right blink, then on
+        *  6: 1/top-left on
+        *  7: 2/top-right on
+        *  8: 3/bottom-left on
+        *  9: 4/bottom-right on
+        * 10: rotate
+        * 11: blink, based on previous setting
+        * 12: slow blink, based on previous setting
+        * 13: rotate with two lights
+        * 14: persistent slow all blink
+        * 15: blink once, then previous setting
+3. the generic event device
+    * example `fftest /dev/input/by-id/usb-*360*event*`
+
+# Debugging
+As a regular unpriveledged user
+
+Setup console to display kernel log.  
+`dmesg --level=debug --follow`
+
+Open a new console and access the device with jstest.  
+`jstest /dev/input/jsX`
+
+Interact with the device and observe that data packets recieved from device are printed to kernel log.
+```
+[ 3968.772128] xpad-dbg: 00000000: 20 00 b5 0e 00 00 00 00 00 00 0c 03 04 fd 6c 01 40 fe 00 00 00 00 00 00 00 00 00 00 00 00 00 00
+[ 3968.772135] xpad-dbg: 00000020: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
+[ 3968.804137] xpad-dbg: 00000000: 20 00 b6 0e 00 00 00 00 00 00 0c 03 04 fd 6c 01 fc fd 00 00 00 00 00 00 00 00 00 00 00 00 00 00
+[ 3968.804145] xpad-dbg: 00000020: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
+[ 3969.152120] xpad-dbg: 00000000: 20 00 b7 0e 00 00 00 00 00 00 0c 03 04 fd 6c 01 b8 fd 00 00 00 00 00 00 00 00 00 00 00 00 00 00
+[ 3969.152129] xpad-dbg: 00000020: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
+```
+
+Save dmesg buffer and attach to bug report, don't forget to describe button sequences in bug report.  
+`dmesg --level=debug > dmesg.txt`
+
+Ctrl+C to close interactive console sessions when finished.
+
+# Sending Upstream
+
+1. `git format-patch --cover-letter upstream..master`
+2. `git send-email --to xxx *.patch`

stress_urb_out.sh

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+#!/bin/sh
+# stress test irq_urb_out. provokes URB request dropping.
+# script by Laura Abbott
+# see: http://www.spinics.net/lists/linux-input/msg40477.html
+
+while true; do
+    for i in $(seq 0 5); do
+        echo $i > /sys/class/leds/xpad0/subsystem/xpad0/brightness
+    done
+done