078beafb2d
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
1.3 KiB
ColorHug Support
Introduction
The ColorHug is an affordable open source display colorimeter built by Hughski Limited. The USB device allows you to calibrate your screen for accurate color matching.
ColorHug versions 1 and 2 support a custom HID-based flashing protocol, but version 3 (ColorHug+) has now switched to DFU.
Firmware Format
The daemon will decompress the cabinet archive and extract a firmware blob in a packed binary file format.
This plugin supports the following protocol ID:
- com.hughski.colorhug
GUID Generation
These devices use the standard USB DeviceInstanceId values, e.g.
USB\VID_273F&PID_1001&REV_0001USB\VID_273F&PID_1001USB\VID_273F
Update Behavior
The device usually presents in runtime mode, but on detach re-enumerates with a different USB 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, in this instance set to USB:0x273F
External interface access
This plugin requires read/write access to /dev/bus/usb.