linux-kernel - [PATCH 5/8] usb: audio-v2: add ability to define feature unit descriptor

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Date:   Mon,  1 Mar 2021 15:05:40 +0200
From:   Ruslan Bilovol <ruslan.bilovol@...il.com>
To:     Felipe Balbi <balbi@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jonathan Corbet <corbet@....net>
Cc:     gschmottlach@...il.com, linux-usb@...r.kernel.org,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 5/8] usb: audio-v2: add ability to define feature unit descriptor

Similar to UAC1 spec, UAC2 feature unit descriptor
has variable size.

Current audio-v2 feature unit descriptor structure
is used for parsing descriptors, but can't be used
to define your own descriptor.

Add a new macro similar to what audio v1 already has.

Signed-off-by: Ruslan Bilovol <ruslan.bilovol@...il.com>
---
 include/linux/usb/audio-v2.h | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/include/linux/usb/audio-v2.h b/include/linux/usb/audio-v2.h
index ead8c9a..8fc2abd 100644
--- a/include/linux/usb/audio-v2.h
+++ b/include/linux/usb/audio-v2.h
@@ -156,6 +156,20 @@ struct uac2_feature_unit_descriptor {
 	__u8 bmaControls[]; /* variable length */
 } __attribute__((packed));
 
+#define UAC2_DT_FEATURE_UNIT_SIZE(ch)		(6 + ((ch) + 1) * 4)
+
+/* As above, but more useful for defining your own descriptors: */
+#define DECLARE_UAC2_FEATURE_UNIT_DESCRIPTOR(ch)		\
+struct uac2_feature_unit_descriptor_##ch {			\
+	__u8  bLength;						\
+	__u8  bDescriptorType;					\
+	__u8  bDescriptorSubtype;				\
+	__u8  bUnitID;						\
+	__u8  bSourceID;					\
+	__le32 bmaControls[ch + 1];				\
+	__u8  iFeature;						\
+} __packed
+
 /* 4.7.2.10 Effect Unit Descriptor */
 
 struct uac2_effect_unit_descriptor {
-- 
1.9.1