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| author |   Ruslan Bilovol <ruslan.bilovol@gmail.com> | 2021-07-12 14:55:26 +0200 |
|---|---|---|
| committer |   Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-07-21 10:10:11 +0200 |
| commit | b48f8939b9ff593ebed20433bb53c51199920412 (patch) | |
| tree | 06624dbed7bef0c12e3a1782e556939b222517e4 | |
| parent | dt-bindings: usb: generic-ohci: Document dr_mode property (diff) | |
| download | linux-dev-b48f8939b9ff593ebed20433bb53c51199920412.tar.xz linux-dev-b48f8939b9ff593ebed20433bb53c51199920412.zip | |
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@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>
| -rw-r--r-- | include/linux/usb/audio-v2.h | 14 |
1 files changed, 14 insertions, 0 deletions
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 { |