linux-kernel - Re: [PATCH v2] ALSA: usb-audio: add mixer support for Focusrite Forte

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Message-ID: <87pl6v2zx4.wl-tiwai@suse.de>
Date: Tue, 27 Jan 2026 10:00:23 +0100
From: Takashi Iwai <tiwai@...e.de>
To: Jegor van Opdorp <jegorvanopdorp@...il.com>
Cc: linux-sound@...r.kernel.org,
	tiwai@...e.com,
	perex@...ex.cz,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] ALSA: usb-audio: add mixer support for Focusrite Forte

On Tue, 27 Jan 2026 09:15:41 +0100,
Jegor van Opdorp wrote:
> 
> Add mixer control support for the Focusrite Forte (USB ID 0x1235:0x8010),
> an older USB audio interface that predates the Scarlett 2nd generation.
> 
> The Forte uses UAC2_CS_MEM (bRequest=0x03) for its input controls rather
> than the standard UAC2_CS_CUR (0x01) used by Scarlett devices. This patch
> adds Forte-specific control handlers that use the correct USB protocol.
> 
> Features implemented:
> - Input source selection (Mic/Line/Inst) for both channels
> - High pass filter switch
> - 48V phantom power switch
> - Phase invert switch
> - Pad switch
> - Preamp gain control (0-42 range, ~0-75dB)
> - Matrix mixer controls (6 inputs x 4 outputs)
> - Output volume and mute controls
> 
> The device is registered via mixer_quirks.c and uses the existing
> mixer_scarlett.c infrastructure with Forte-specific additions.
> 
> Credit: This work builds on prior reverse-engineering by alastair-dm.
> 
> Link: https://github.com/alastair-dm/forte-mixer/wiki
> Link: https://github.com/alastair-dm/forte-mixer
> Link: https://github.com/jopdorp/forte-mixer
> Signed-off-by: Jegor van Opdorp <jegorvanopdorp@...il.com>

Thanks, applied now to for-next branch.

I noticed that I took your previous version mistakenly, so I dropped
it and reapplied the v2.


Takashi