From b48f8939b9ff593ebed20433bb53c51199920412 Mon Sep 17 00:00:00 2001
From: Ruslan Bilovol <ruslan.bilovol@gmail.com>
Date: Mon, 12 Jul 2021 14:55:26 +0200
Subject: [PATCH] usb: audio-v2: add ability to define feature unit descriptor
Git-commit: b48f8939b9ff593ebed20433bb53c51199920412
References: git-fixes
Patch-mainline: v5.15-rc1
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@gmail.com>
Signed-off-by: Pavel Hofman <pavel.hofman@ivitera.com>
Link: https://lore.kernel.org/r/20210712125529.76070-2-pavel.hofman@ivitera.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Oliver Neukum <oneukum@suse.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 ead8c9a47c6a..8fc2abd7aecb 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 {
--
2.26.2