[PATCH 1/2] ALSA: usb-audio: Add quirk flags for Feaulle Rainbow

[Rong Zhang]

Feaulle Rainbow is a wired USB-C dynamic in-ear monitor (IEM) featuring
active noise cancellation (ANC).

The supported sample rates are 48000Hz and 96000Hz at 16bit or 24bit,
but it does not support reading the current sample rate and results in
an error message printed to kmsg. Set QUIRK_FLAG_GET_SAMPLE_RATE to skip
the sample rate check.

Its playback mixer reports val = -15360/0/128. Setting -15360 (-60dB)
mutes the playback, so QUIRK_FLAG_MIXER_PLAYBACK_MIN_MUTE is needed.

Add a quirk table entry matching VID/PID=0x0e0b/0xfa01 and applying
the mentioned quirk flags, so that it can work properly.

Quirky device sample:

  usb 7-1: New USB device found, idVendor=0e0b, idProduct=fa01, bcdDevice= 1.00
  usb 7-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
  usb 7-1: Product: Feaulle Rainbow
  usb 7-1: Manufacturer: Generic
  usb 7-1: SerialNumber: 20210726905926

Signed-off-by: Rong Zhang <i@xxxxxxxx>
---
 sound/usb/quirks.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/sound/usb/quirks.c b/sound/usb/quirks.c
index 48acd8dac689..f73d5d01726e 100644
--- a/sound/usb/quirks.c
+++ b/sound/usb/quirks.c
@@ -2337,6 +2337,8 @@ static const struct usb_audio_quirk_flags_table quirk_flags_table[] = {
 		   QUIRK_FLAG_MIXER_PLAYBACK_MIN_MUTE),
 	DEVICE_FLG(0x0d8c, 0x0014, /* C-Media */
 		   QUIRK_FLAG_CTL_MSG_DELAY_1M | QUIRK_FLAG_MIXER_PLAYBACK_MIN_MUTE),
+	DEVICE_FLG(0x0e0b, 0xfa01, /* Feaulle Rainbow */
+		   QUIRK_FLAG_GET_SAMPLE_RATE | QUIRK_FLAG_MIXER_PLAYBACK_MIN_MUTE),
 	DEVICE_FLG(0x0ecb, 0x205c, /* JBL Quantum610 Wireless */
 		   QUIRK_FLAG_FIXED_RATE),
 	DEVICE_FLG(0x0ecb, 0x2069, /* JBL Quantum810 Wireless */

-- 
2.53.0