90-MCP2221-LibUsbDotNet.rules

# SPDX-FileCopyrightText: 2021 smdn <smdn@smdn.jp>
# SPDX-License-Identifier: MIT
#
#      udev rules for MCP2221/MCP2221A + LibUsbDotNet (libusb)
#
# copy this file to `/etc/udev/rules.d/` and run `sudo udevadm control --reload-rules && sudo udevadm trigger -s usb`
# tested on Ubuntu 20.04.2 LTS
#
# reference:
#   http://reactivated.net/writing_udev_rules.html
#   https://wiki.archlinux.jp/index.php/Udev
#

SUBSYSTEM=="usb", DRIVER=="usb|usbhid", \
# [mandatory] matching keys for MCP2221/MCP2221A
  ATTRS{idVendor}=="04d8", ATTRS{idProduct}=="00dd", \
# [optional] matching keys for the device bus number and device path of MCP2221/MCP2221A
#  ATTRS{busnum}=="x", ATTRS{devpath}!="y", \
# [mandatory] unbind kernel driver from MCP2221/MCP2221A's HID interface
  RUN+="/bin/sh -c 'echo $kernel >/sys/bus/usb/drivers/usbhid/unbind'", \
# [optional] grant non-root user access to MCP2221/MCP2221A by specifying group for the device
  GROUP="plugdev", TAG+="uaccess", \
# [optional] grant non-root user access to MCP2221/MCP2221A by specifying permission for the device
#  MODE="0666", \