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UPSTREAM: usb: gadget: configfs: Add frame-based frame format support

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Add support for frame-based frame format, which can be used to support
multiple formats like H264 or H265, in addition to MJPEG and YUV frames.

The frame-based format is set to H264 by default, but it can be updated
to other formats by modifying the GUID through the guid configfs
attribute. Different structures are used for all three formats, as
H264 has a different structure compared to MJPEG and uncompressed
formats. These structures will be passed to the frame make function
based on the active format, using a common frame structure with
additional parameters needed only for frame-based formats. These
parameters are handled at runtime in the UVC driver.

Signed-off-by: Akash Kumar <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>

Git-commit: 7b5a58952fc3b51905c2963647485565df1e5e26
Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git.

Change-Id: Iffef14deba1f7e22c74b89b72a252f23802549d4
Signed-off-by: Akash Kumar <[email protected]>
This commit is contained in:
Akash Kumar 2025-10-30 16:07:18 +05:30
commit 5cef717354
5 changed files with 469 additions and 14 deletions
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65
Documentation/ABI/testing/configfs-usb-gadget-uvc
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@ -265,6 +265,71 @@ Description: Specific uncompressed frame descriptors
bmCapabilities - still image support, fixed frame-rate
support
What: /config/usb-gadget/gadget/functions/uvc.name/streaming/framebased
Date: Oct 2025
KernelVersion: 5.4
Description: Framebased format descriptors
What: /config/usb-gadget/gadget/functions/uvc.name/streaming/framebased/name
Date: Oct 2025
KernelVersion: 5.4
Description: Specific framebased format descriptors
================== =======================================
bFormatIndex unique id for this format descriptor;
only defined after parent header is
linked into the streaming class;
read-only
bmaControls this format's data for bmaControls in
the streaming header
bmInterlaceFlags specifies interlace information,
read-only
bAspectRatioY the X dimension of the picture aspect
ratio, read-only
bAspectRatioX the Y dimension of the picture aspect
ratio, read-only
bDefaultFrameIndex optimum frame index for this stream
bBitsPerPixel number of bits per pixel used to
specify color in the decoded video
frame
guidFormat globally unique id used to identify
stream-encoding format
================== =======================================
What: /config/usb-gadget/gadget/functions/uvc.name/streaming/framebased/name/name
Date: Sept 2024
KernelVersion: 5.15
Description: Specific framebased frame descriptors
========================= =====================================
bFrameIndex unique id for this framedescriptor;
only defined after parent format is
linked into the streaming header;
read-only
dwFrameInterval indicates how frame interval can be
programmed; a number of values
separated by newline can be specified
dwDefaultFrameInterval the frame interval the device would
like to use as default
dwBytesPerLine Specifies the number of bytes per line
of video for packed fixed frame size
formats, allowing the receiver to
perform stride alignment of the video.
If the bVariableSize value (above) is
TRUE (1), or if the format does not
permit such alignment, this value shall
be set to zero (0).
dwMaxBitRate the maximum bit rate at the shortest
frame interval in bps
dwMinBitRate the minimum bit rate at the longest
frame interval in bps
wHeight height of decoded bitmap frame in px
wWidth width of decoded bitmam frame in px
bmCapabilities still image support, fixed frame-rate
support
========================= =====================================
What: /config/usb-gadget/gadget/functions/uvc.name/streaming/header
Date: Dec 2014
KernelVersion: 4.0