linux-kernel - [PATCH] NDI FTDI USB driver support

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Message-ID:
 <YQXPR01MB4987C8EA75554A89700D853DDF43A@YQXPR01MB4987.CANPRD01.PROD.OUTLOOK.COM>
Date: Thu, 3 Jul 2025 18:51:50 +0000
From: Ryan Mann <rmann@...gital.com>
To: "johan@...nel.org" <johan@...nel.org>, "gregkh@...uxfoundation.org"
	<gregkh@...uxfoundation.org>
CC: "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: [PATCH] NDI FTDI USB driver support

Hi John and Greg,
Tag: ndi-usb-serial-ftdi-6.16-rc4
Public branch: https://github.com/rmann-ndi/linux-kernel/tree/ndi_usb_serial_ftdi
This represents changes to the FTDI USB serial device drivers to support a new NDI (Northern Digital Inc.) product called the EMGUIDE GEMINI. The EMGUIDE GEMINI will support 1.2Mbaud the same as other NDI FTDI virtual COM port devices. It was noticed in making this change that the NDI Aurora was included in this "quirk", but it does not support rates as high as 1.2Mbaud, so it was replaced by the EMGUIDE.
Previous FTDI devices produced by NDI all used the FTDI VID (0x0403) and a very limited set of PIDs that Future Technology Devices allowed NDI to use (0xda70 to 0xda74). Since then, NDI has reserved its own VID (0x23f2), and used two of the PIDs for two experimental, non-production products that didn't use the FTDI chip for USB connection.
This patch adds the new VID as "FTDI_NDI_VID" in the ftdi_sio_ids.h header file. It also reserves PID 0x0003 for the EMGUIDE GEMINI, as well as stubbing out PIDs 0x0004 through 0x0009 for "future" NDI devices. In the unlikely event that the NDI hardware team chooses to implement the USB functionality using something other than FTDI chips, those "future device" lines may need to get removed.
As the EMGUIDE GEMINI product development has not been completed and the step to write over the default VID and PID has not been completed, these code changes have not been tested with an EMGUIDE GEMINI. However, the code changes were compiled successfully using Ubuntu 24.04 locally and tested as a module using an NDI Aurora system.
Thanks,
-------------------------------------
Ryan Mann
Software Development Lead
103 Randall Drive
Waterloo, ON, Canada N2V 1C5
www.ndigital.com