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
1.7 KiB
Wacom USB Support
Introduction
Wacom provides interactive pen displays, pen tablets, and styluses to equip and inspire everyone make the world a more creative place.
From 2016 Wacom has been using a HID-based proprietary flashing algorithm which has been documented by support team at Wacom and provided under NDA under the understanding it would be used to build a plugin under a LGPLv2+ license.
Wacom devices are actually composite devices, with the main ARM CPU being programmed using a more complicated erase, write, verify algorithm based on a historical update protocol. The "sub-module" devices use a newer protocol, again based on HID, but are handled differently depending on their type.
Firmware Format
The daemon will decompress the cabinet archive and extract a firmware blob in the following formats:
- Touch module: Intel HEX file format
- Bluetooth module: Unknown airoflash file format
- EMR module: Plain SREC file format
- Main module: SREC file format, with a custom
WACOMvendor header
This plugin supports the following protocol ID:
- com.wacom.usb
GUID Generation
These devices use the standard USB DeviceInstanceId values, e.g.
USB\VID_056A&PID_0378&REV_0001USB\VID_056A&PID_0378USB\VID_056A
Update Behavior
The firmware is deployed when the device is in normal runtime mode, and the device will reset when the new firmware has been written.
Vendor ID Security
The vendor ID is set from the USB vendor, for example set to USB:0x056A
External interface access
This plugin requires read/write access to /dev/bus/usb.