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authorLaurent Pinchart <laurent.pinchart@ideasonboard.com>2018-05-23 17:47:56 +0200
committerLaurent Pinchart <laurent.pinchart@ideasonboard.com>2018-09-24 17:54:26 +0200
commitbf71544883a1ccb20021eb5139475496dbd8abd9 (patch)
treee9614859bafc12c92acfa0ff9f09f27eb10fa939 /Documentation/ABI
parentusb: gadget: uvc: configfs: Allocate groups dynamically (diff)
downloadlinux-bf71544883a1ccb20021eb5139475496dbd8abd9.tar.xz
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usb: gadget: uvc: configfs: Add interface number attributes
The video control and video streaming interface numbers are needed in the UVC gadget userspace stack to reply to UVC requests. They are hardcoded to fixed values at the moment, preventing configurations with multiple functions. To fix this, make them dynamically discoverable by userspace through read-only configfs attributes in <function>/control/bInterfaceNumber and <function>/streaming/bInterfaceNumber respectively. 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-uvc8
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 9281e2aa38df..490a0136fb02 100644
--- a/Documentation/ABI/testing/configfs-usb-gadget-uvc
+++ b/Documentation/ABI/testing/configfs-usb-gadget-uvc
@@ -12,6 +12,10 @@ Date: Dec 2014
KernelVersion: 4.0
Description: Control descriptors
+ All attributes read only:
+ bInterfaceNumber - USB interface number for this
+ streaming interface
+
What: /config/usb-gadget/gadget/functions/uvc.name/control/class
Date: Dec 2014
KernelVersion: 4.0
@@ -109,6 +113,10 @@ Date: Dec 2014
KernelVersion: 4.0
Description: Streaming descriptors
+ All attributes read only:
+ bInterfaceNumber - USB interface number for this
+ streaming interface
+
What: /config/usb-gadget/gadget/functions/uvc.name/streaming/class
Date: Dec 2014
KernelVersion: 4.0