mirror of https://git.proxmox.com/git/fwupd synced 2025-06-28 16:03:16 +00:00

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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DFU Support

Introduction

Device Firmware Update is a standard that allows USB devices to be easily and safely updated by any operating system.

Firmware Format

The daemon will decompress the cabinet archive and extract a firmware blob in DFU or DfuSe file format.

This plugin supports the following protocol IDs:

org.usb.dfu
com.st.dfuse

GUID Generation

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

USB\VID_273F&PID_1003&REV_0001
USB\VID_273F&PID_1003
USB\VID_273F

Update Behavior

A DFU device usually presents in runtime mode (with optional DFU runtime), but on detach re-enumerates with an additional required DFU descriptor. 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, for example USB:0x0A12

Quirk use

This plugin uses the following plugin-specific quirks:

Quirk	Description	Minimum fwupd version
`DfuFlags`	Optional quirks for a DFU device which doesn't follow the DFU 1.0 or 1.1 specification	1.0.1
`DfuForceVersion`	Forces a specific DFU version for the hardware device. This is required if the device does not set, or sets incorrectly, items in the DFU functional descriptor.	1.0.1
`DfuForceTimeout`	Forces a specific device timeout, in ms	1.4.0
`DfuForceTransferSize`	Forces a target transfer size, in bytes	1.5.6

External interface access

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

1.9 KiB Raw Blame History