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| author |   Joel Pepper <joel.pepper@rwth-aachen.de> | 2018-05-29 21:02:13 +0200 |
|---|---|---|
| committer |   Laurent Pinchart <laurent.pinchart@ideasonboard.com> | 2018-09-24 19:00:35 +0300 |
| commit | b206548be6459ea5ffa82b9f1175915b225a89a1 (patch) | |
| tree | a4829236755de0f970f8bae416cad8ee5742dbe6 /Documentation/ABI | |
| parent | usb: gadget: uvc: configfs: Add bFormatIndex attributes (diff) | |
| download | linux-dev-b206548be6459ea5ffa82b9f1175915b225a89a1.tar.xz linux-dev-b206548be6459ea5ffa82b9f1175915b225a89a1.zip | |
usb: gadget: uvc: configfs: Add bFrameIndex attributes
- Add bFrameIndex as a UVCG_FRAME_ATTR_RO for each frame size.
- Automatically assign ascending bFrameIndex to each frame in a format.
Before all "bFrameindex" attributes were set to "1" with no way to
configure the gadget otherwise. This resulted in the host always
negotiating for bFrameIndex 1 (i.e. the first frame size of the gadget).
After the negotiation the host driver will set the user or application
selected frame size, while the gadget is actually set to the first frame
size.
Now, when the containing format is linked into the streaming header,
iterate over all child frame descriptors and assign ascending indices.
The automatically assigned indices can be read from the new read only
bFrameIndex configfs attribute in each frame descriptor item.
Signed-off-by: Joel Pepper <joel.pepper@rwth-aachen.de>
[Simplified documentation, renamed function, blank space update]
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Diffstat (limited to 'Documentation/ABI')
| -rw-r--r-- | Documentation/ABI/testing/configfs-usb-gadget-uvc | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/Documentation/ABI/testing/configfs-usb-gadget-uvc b/Documentation/ABI/testing/configfs-usb-gadget-uvc index a6cc8d6d398e..809765bd9573 100644 --- a/Documentation/ABI/testing/configfs-usb-gadget-uvc +++ b/Documentation/ABI/testing/configfs-usb-gadget-uvc @@ -189,6 +189,10 @@ Date: Dec 2014 KernelVersion: 4.0 Description: Specific MJPEG 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 @@ -240,6 +244,10 @@ Date: Dec 2014 KernelVersion: 4.0 Description: Specific uncompressed 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 |