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fwupd/plugins/genesys/README.md
Gaël PORTAY be4e3fffdc genesys: usbhub: Identify HP usbhub using its public-key 
The HP M2xfd monitors use GenesysLogic GL3523 USB Hub and provides their
own firmwares. Furthermore, HP uses the same VID/PID for other USB Hubs
products, with a different public-key; the HP M24fd and M27fd use
different public-key.

This appends the public-key to the instance-id string to make the
distinction between all the HP USB Hubs, and prevents to install a
firmware with the wrong public-key.
2022-03-23 20:46:39 +00:00

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Genesys Logic

Introduction

This plugin allows updating the Genesys Logic USB Hub devices.

  • GL3523
  • GL3590

Additionally, this plugin allows updating the MStar Semiconductor Scaler connected via an I²C bus.

  • TSUM G

Firmware Format

The daemon will decompress the cabinet archives and extract the firmware blob in an unspecified binary file format.

This plugin supports the following protocol IDs:

  • com.genesys.usbhub
  • com.mstarsemi.scaler

GUID Generation

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

  • HP USB-C Controller: USB\VID_03F0&PID_0610
  • HP M24fd USB-C Controller: USB\VID_03F0&PID_0610&PUBKEY_B335BDCE-7073-5D0E-9BD3-9B69C1A6899F
  • HP M27fd USB-C Controller: USB\VID_03F0&PID_0610&PUBKEY_847A3650-8648-586B-83C8-8B53714F37E3

These devices also use custom GUID values for the Scaler, e.g.

  • HP M24fd USB-C Monitor: GENESYS_SCALER\MSTAR_TSUM_G&PUBKEY_B335BDCE-7073-5D0E-9BD3-9B69C1A6899F
  • HP M27fd USB-C Monitor: GENESYS_SCALER\MSTAR_TSUM_G&PUBKEY_847A3650-8648-586B-83C8-8B53714F37E3

The Public Key is product-specific and is required to identify the product.

Quirk Use

This plugin uses the following plugin-specific quirks:

has-mstar-scaler

USB Hub has a MStar Semiconductor Scaler attached via I²C.

Since 1.7.6.

GenesysUsbhubSwitchRequest

USB Hub Switch Request value.

  • HP Mxfd FHD Monitors: 0xA1

Since 1.7.6.

GenesysUsbhubReadRequest

USB Hub Read Request value.

  • HP Mxfd FHD Monitors: 0xA2

Since 1.7.6.

GenesysUsbhubWriteRequest

USB Hub Write Request value.

  • HP Mxfd FHD Monitors: 0xA3

Since 1.7.6.

use-i2c-ch0

Scalar uses I²C channel 0.

Since 1.7.6.

pause-r2-cpu

Scalar pause R2 CPU.

Since 1.7.6.

GenesysScalerDeviceTransferSize

Scaler Block size to use for transfers.

  • MStar Semiconductor TSUM G: 0x40

Since 1.7.6.

GenesysScalerGpioOutputRegister

Scaler GPIO Output Register value.

  • MStar Semiconductor TSUM G: 0x0426

Since 1.7.6.

GenesysScalerGpioEnableRegister

Scaler GPIO Enable Register value.

  • MStar Semiconductor TSUM G: 0x0428

Since 1.7.6.

GenesysScalerGpioValue

Scaler GPIO value.

  • MStar Semiconductor TSUM G: 0x01

Since 1.7.6.

Runtime Requirement

The USB Hub devices and its attached Scaler require libgusb version 0.3.8 or later to be detected.

Update Behavior

The devices are independently updated at runtime using USB control transfers.

The firmware is deployed when the device is in normal runtime mode, and the device will reset when the new firmware has been written.

The HP Mxfd FHD Monitors must be connected to host via the USB-C cable to apply an update. The devices remain functional during the update; the Scaler update is ~10 minute long.

Vendor ID Security

The vendor ID is set from the USB vendor, for example set to USB:0x03F0 for HP.

External Interface Access

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