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| author |   Laurent Pinchart <laurent.pinchart@ideasonboard.com> | 2018-05-27 00:51:57 +0300 |
|---|---|---|
| committer | Laurent Pinchart <laurent.pinchart@ideasonboard.com> | 2018-09-24 18:54:32 +0300 |
| commit | 61ff10e0ea0cb39c737eab7e4fc5f0ae4d0fff33 (patch) | |
| tree | 8e223ae0ac15fa3eaddddb4ca32a63b861ae7a64 /Documentation/ABI | |
| parent | usb: gadget: uvc: configfs: Add interface number attributes (diff) | |
| download | linux-dev-61ff10e0ea0cb39c737eab7e4fc5f0ae4d0fff33.tar.xz linux-dev-61ff10e0ea0cb39c737eab7e4fc5f0ae4d0fff33.zip | |
usb: gadget: uvc: configfs: Add bFormatIndex attributes
The UVC format description are numbered using the descriptor's
bFormatIndex field. The index is used in UVC requests, and is thus
needed to handle requests in userspace. Make it dynamically discoverable
by exposing it in a bFormatIndex configfs attribute of the uncompressed
and mjpeg format config items.
The bFormatIndex value exposed through the attribute is stored in the
config item private data. However, that value is never set: the driver
instead computes the bFormatIndex value when linking the stream class
header in the configfs hierarchy and stores it directly in the class
descriptors in a separate structure. In order to expose the value
through the configfs attribute, store it in the config item private data
as well. This results in a small code simplification.
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 490a0136fb02..a6cc8d6d398e 100644 --- a/Documentation/ABI/testing/configfs-usb-gadget-uvc +++ b/Documentation/ABI/testing/configfs-usb-gadget-uvc @@ -168,6 +168,10 @@ Description: Specific MJPEG format descriptors All attributes read only, except bmaControls and bDefaultFrameIndex: + 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 bmInterfaceFlags - specifies interlace information, @@ -212,6 +216,10 @@ Date: Dec 2014 KernelVersion: 4.0 Description: Specific uncompressed 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 bmInterfaceFlags - specifies interlace information, |