linux-kernel - [PATCH] ALSA: usb-audio: Add quirk for VF0770

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Date:   Sun, 10 Oct 2021 13:19:47 +0200
From:   Jonas Hahnfeld <hahnjo@...njo.de>
To:     Takashi Iwai <tiwai@...e.com>, Jaroslav Kysela <perex@...ex.cz>
Cc:     alsa-devel@...a-project.org, linux-kernel@...r.kernel.org,
        Jonas Hahnfeld <hahnjo@...njo.de>
Subject: [PATCH] ALSA: usb-audio: Add quirk for VF0770

The device advertises 8 formats, but only a rate of 48kHz is honored
by the hardware and 24 bits give chopped audio, so only report the
one working combination. This fixes out-of-the-box audio experience
with PipeWire which otherwise attempts to choose S24_3LE (while
PulseAudio defaulted to S16_LE).

Signed-off-by: Jonas Hahnfeld <hahnjo@...njo.de>
---
 sound/usb/quirks-table.h | 39 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 39 insertions(+)

diff --git a/sound/usb/quirks-table.h b/sound/usb/quirks-table.h
index e03043f7dad3..be5c2bc26a1d 100644
--- a/sound/usb/quirks-table.h
+++ b/sound/usb/quirks-table.h
@@ -77,6 +77,45 @@
 /* E-Mu 0204 USB */
 { USB_DEVICE_VENDOR_SPEC(0x041e, 0x3f19) },
 
+/*
+ * Creative Technology, Ltd Live! Cam Sync HD [VF0770]
+ * The device advertises 8 formats, but only a rate of 48kHz is honored by the
+ * hardware and 24 bits give chopped audio, so only report the one working
+ * combination.
+ */
+{
+	USB_DEVICE(0x041e, 0x4095),
+	.driver_info = (unsigned long) &(const struct snd_usb_audio_quirk) {
+		.ifnum = QUIRK_ANY_INTERFACE,
+		.type = QUIRK_COMPOSITE,
+		.data = &(const struct snd_usb_audio_quirk[]) {
+			{
+				.ifnum = 2,
+				.type = QUIRK_AUDIO_STANDARD_MIXER,
+			},
+			{
+				.ifnum = 3,
+				.type = QUIRK_AUDIO_FIXED_ENDPOINT,
+				.data = &(const struct audioformat) {
+					.formats = SNDRV_PCM_FMTBIT_S16_LE,
+					.channels = 2,
+					.fmt_bits = 16,
+					.iface = 3,
+					.altsetting = 4,
+					.altset_idx = 4,
+					.endpoint = 0x82,
+					.ep_attr = 0x05,
+					.rates = SNDRV_PCM_RATE_48000,
+					.rate_min = 48000,
+					.rate_max = 48000,
+					.nr_rates = 1,
+					.rate_table = (unsigned int[]) { 48000 },
+				},
+			},
+		},
+	},
+},
+
 /*
  * HP Wireless Audio
  * When not ignored, causes instability issues for some users, forcing them to
-- 
2.33.0