Re: [PATCH v30 28/30] ALSA: usb-audio: Add USB offload route kcontrol

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On 2024-11-06 8:34 PM, Wesley Cheng wrote:
In order to allow userspace/applications know about USB offloading status,
expose a sound kcontrol that fetches information about which sound card
and PCM index the USB device is mapped to for supporting offloading.  In
the USB audio offloading framework, the ASoC BE DAI link is the entity
responsible for registering to the SOC USB layer.

...

R) += mixer_usb_offload.o
diff --git a/sound/usb/mixer_usb_offload.c b/sound/usb/mixer_usb_offload.c
new file mode 100644
index 000000000000..e0689a3b9b86
--- /dev/null
+++ b/sound/usb/mixer_usb_offload.c
@@ -0,0 +1,102 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2022-2024 Qualcomm Innovation Center, Inc. All rights reserved.
+ */
+
+#include <linux/usb.h>
+
+#include <sound/core.h>
+#include <sound/control.h>
+#include <sound/soc-usb.h>

ALSA-components should not be dependent on ASoC ones. It should be done the other way around: ALSA <- ASoC.

+
+#include "usbaudio.h"
+#include "card.h"
+#include "helper.h"
+#include "mixer.h"
+
+#include "mixer_usb_offload.h"




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