linux

ALSA: FCP: Add Focusrite Control Protocol driver Add a new kernel driver for the Focusrite Control Protocol (FCP), which is used by Focusrite Scarlett 2nd Gen, 3rd Gen, 4th Gen, Clarett USB, Clarett+, and Vocaster series audio interfaces. This driver provides a user-space control interface via ALSA's hwdep subsystem. Unlike the existing Scarlett2 driver which implements all ALSA controls in kernel space, this new FCP driver takes a different approach by providing a minimal kernel interface that allows a user-space driver to send FCP commands and receive notifications. The only control implemented in kernel space is the Level Meter, since it requires frequent polling of volatile data. While this driver supports all interfaces that the Scarlett2 driver works with, it is initially enabled only for 4th Gen 16i16, 18i16, and 18i20 interfaces that are not supported by the Scarlett2 driver. Signed-off-by: Geoffrey D. Bennett <g@b4.vu> Link: https://patch.msgid.link/597741a9b1198b965561547511d3d345f91cba20.1737048528.git.g@b4.vu Signed-off-by: Takashi Iwai <tiwai@suse.de> 2025-01-17 04:17:38 +10:30