[v2,0/7] UVC Gadget: Extend color matching support

Message

Dan Scally Dec. 19, 2022, 2:43 p.m. UTC

The current UVC gadget implementation hardcodes a single color matching
descriptor and includes it in the payload of USB descriptors a single time
following all the format and frame descriptors. This is inflexible, and
additionally applies only to the _last_ format in the array of descriptors.

This series extends the support such that the default descriptor can be amended
and is included once-per-format instead of once-only, it then adds the ability
to create new color matching descriptors and associate them with particular formats.
The default color matching descriptor is retained and used where the user does not
link a new color matching descriptor to the format, so the default interaction
with userspace is unchanged from the current implementation.

Daniel Scally (7):
  usb: gadget: usb: Remove "default" from color matching attributes
  usb: uvc: Enumerate valid values for color matching
  usb: gadget: uvc: Add struct for color matching in configs
  usb: gadget: uvc: Copy color matching descriptor for each frame
  usb: gadget: uvc: Remove the hardcoded default color matching
  usb: gadget: uvc: Make color matching attributes read/write
  usb: gadget: uvc: Allow creating new color matching descriptors

 .../ABI/testing/configfs-usb-gadget-uvc       |  19 +-
 drivers/usb/gadget/function/f_uvc.c           |   9 -
 drivers/usb/gadget/function/u_uvc.h           |   1 -
 drivers/usb/gadget/function/uvc_configfs.c    | 278 ++++++++++++++++--
 drivers/usb/gadget/function/uvc_configfs.h    |  22 +-
 include/uapi/linux/usb/video.h                |  30 ++
 6 files changed, 311 insertions(+), 48 deletions(-)