Messages in this thread Patch in this message | | | From | Ruslan Bilovol <> | Subject | [PATCH 5/8] usb: audio-v2: add ability to define feature unit descriptor | Date | Mon, 1 Mar 2021 15:05:40 +0200 |
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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> --- 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
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