#### Plugin: Wacom USB

## 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 `WACOM` vendor 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`

## 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`.

## Version Considerations

This plugin has been available since fwupd version `1.2.2`.