[PATCH] ALSA: FCP: Add Focusrite ISA C8X support

["Geoffrey D. Bennett" <g@b4.vu>]

Add USB PID 0x821e to the list of devices handled by the Focusrite
Control Protocol (FCP) driver.

Cc: stable@vger.kernel.org
Signed-off-by: Geoffrey D. Bennett <g@b4.vu>
---
Trivial new-device enablement: the ISA C8X uses the same FCP control
interface as the Scarlett 16i16/18i16/18i20 4th Gen, so only the USB
PID needs adding. Device attach and device-map retrieval confirmed on
a pre-production unit.

 sound/usb/mixer_quirks.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/sound/usb/mixer_quirks.c b/sound/usb/mixer_quirks.c
index ec65e8a71919..c89087321173 100644
--- a/sound/usb/mixer_quirks.c
+++ b/sound/usb/mixer_quirks.c
@@ -4449,6 +4449,7 @@ int snd_usb_mixer_apply_create_quirk(struct usb_mixer_interface *mixer)
 	case USB_ID(0x1235, 0x821b): /* Focusrite Scarlett 16i16 4th Gen */
 	case USB_ID(0x1235, 0x821c): /* Focusrite Scarlett 18i16 4th Gen */
 	case USB_ID(0x1235, 0x821d): /* Focusrite Scarlett 18i20 4th Gen */
+	case USB_ID(0x1235, 0x821e): /* Focusrite ISA C8X */
 		err = snd_fcp_init(mixer);
 		break;
 
-- 
2.54.0