From f5e60d56f71bab2a7f93ab3900da22d127e177b2 Mon Sep 17 00:00:00 2001 From: Peter Wu Date: Mon, 15 Dec 2014 01:47:09 +0100 Subject: Add README and copyright header --- README.md | 56 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 56 insertions(+) create mode 100644 README.md (limited to 'README.md') diff --git a/README.md b/README.md new file mode 100644 index 0000000..bd9d177 --- /dev/null +++ b/README.md @@ -0,0 +1,56 @@ +# Logitech Unifying firmware updater for Linux +This repository contains an experimental firmware updater for the Logitech +Wireless Rechargeable Touchpad T650. It was successfully tested on Lekensteyn's +T650 device. + +The tool is created using reverse engineering on the [official Logitech firmware +updater][1] and a virtual, fake [Logitech Unifying Receiver device in QEMU][2]. +It may therefore not work in certain edge cases although I have tried my best to +match the behavior of the firmware updater. See also the comments in +`fw-update.c`. The custom QEMU sources are based on v2.2.0, with +v2.2.0-76-g5ac86ef being the latest version which was used for REing ("unifying: +acknowledge device when entering LTx"). + +If the DFU (Device Firmware Updater) process is generic to all Logitech devices, +then this tool could be modified to handle other devices as well. As of now +(December 2014), it contains some hard-coded details. + +Feel free to risk your device by trying this tool, it worked for me, but YMMV. + +## Building +This tool depends on an experimental ltunify library. The expected directory +layout is: + + - ltunify: https://git.lekensteyn.nl/ltunify.git, branch refactor-lib, tested + with commit 1b3247bc573314e4b05ce5bc60cf9f14c93228a5 + - ltunify/t650-dfu: this repository, tested with commit + 4cc4c75708811d8ef54edd2384b14d00b736c874 + + cd ltunify/lib + make + cd ../t650-dfu + make + +This should produce a `fw-update` binary (tested with Clang 3.5.0). + +## Usage +The command is used as follows: + + ./fw-update /dev/hidrawX device_index flash-file + +Example for my T650 device which is paired on index 2 (use `ltunify list` to +find out the index): + + ./fw-update /dev/hidraw1 2 RQM_041_001_00038.bin + +## Copyright +The `RQM_041_001_00038.bin` firmware blob is from Logitech. License unknown, but +it was retrieved from USB communications between the firmware updater and the +virtual USB device. + +The `fw-update.c` is authored by Peter Wu (peter@lekensteyn.nl). It is released +under the terms of the GPL license version 3 (or any latter version, at your +choice). + + [1]: http://www.logitech.com/en-us/support/articles/unifying-firmware-t650 + [2]: https://git.lekensteyn.nl/peter/qemu/log/?h=logitech-unifying-2.2 -- cgit v1.2.1