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fwupd/plugins/ebitdo/README.md
Richard Hughes 078beafb2d Add a new internal flag to opt-in to GUID matching 
It is far too easy to forget to set FWUPD_DEVICE_FLAG_NO_GUID_MATCHING for new
plugins, and without it it all works really well *until* a user has two devices
of the same type installed at the same time and then one 'disappears' for hard
to explain reasons. Typically we only need it for replug anyway!

Explicitly opt-in to this rarely-required behaviour, with the default to just
use the physical and logical IDs. Also document the update behavior for each
plugin to explain why the flag is being used.

This allows you to have two identical Unifying plugged in without one of them
being hidden from the user, at the same time allowing a HIDRAW<->USB transition
when going to and from bootloader and runtime modes.

This removes the workaround added in 99eb3f06b6.

Fixes https://github.com/fwupd/fwupd/issues/2915
2021-02-25 15:47:25 +00:00

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8Bitdo Support

Introduction

This plugin can flash the firmware on the 8Bitdo game pads.

Ebitdo support is supported directly by this project with the embedded libebitdo library and is possible thanks to the vendor open sourcing the flashing tool.

The 8Bitdo devices share legacy USB VID/PIDs with other projects and so we have to be a bit careful to not claim other devices as our own.

Firmware Format

The daemon will decompress the cabinet archive and extract a firmware blob in an unspecified binary file format. The binary file has a vendor-specific header that is used when flashing the image.

This plugin supports the following protocol ID:

  • com.8bitdo

GUID Generation

These devices use the standard USB DeviceInstanceId values, e.g.

  • USB\VID_2DC8&PID_AB11&REV_0001
  • USB\VID_2DC8&PID_AB11
  • USB\VID_2DC8

Update Behavior

The device usually presents in runtime mode, but on detach re-enumerates with a different USB VID and PID in a bootloader mode. On attach the device again re-enumerates back to the runtime mode.

For this reason the REPLUG_MATCH_GUID internal device flag is used so that the bootloader and runtime modes are treated as the same device.

Vendor ID Security

The vendor ID is set from the USB vendor, which is set to various different values depending on the model and device mode. The list of USB VIDs used is:

  • USB:0x2DC8
  • USB:0x0483
  • USB:0x1002
  • USB:0x1235
  • USB:0x2002
  • USB:0x8000

External interface access

This plugin requires read/write access to /dev/bus/usb.