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usb: audio-v2: add ability to define feature unit descriptor

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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>
This commit is contained in:
Ruslan Bilovol 2021-07-12 14:55:26 +02:00 committed by Greg Kroah-Hartman
parent 0c29ec9210
commit b48f8939b9
1 changed files with 14 additions and 0 deletions
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14
include/linux/usb/audio-v2.h
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@ -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 {