---------- Forwarded message ----------
From: Paulo Assis <pj.assis@xxxxxxxxx>
Date: 2017-04-20 12:04 GMT+01:00
Subject: uvcvideo extension controls
To: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>
Cc: Linux Media Mailing List <linux-media@xxxxxxxxxxxxxxx>, aUDIo
<djaudio101@xxxxxxxxx>
Laurent Hi,
I've just noticed that uvcvideo extension controls no longer work
properly, for instance for a logitech c930e I have the
'UVC_GUID_LOGITECH_PERIPHERAL':
VideoControl Interface Descriptor:
bLength 28
bDescriptorType 36
bDescriptorSubtype 6 (EXTENSION_UNIT)
bUnitID 11
guidExtensionCode {212de5ff-3080-2c4e-82d9-f587d00540bd}
bNumControl 3
bNrPins 1
baSourceID( 0) 10
bControlSize 3
bmControls( 0) 0x00
bmControls( 1) 0x41
bmControls( 2) 0x01
iExtension 0
when I try to map or query the controls associated with this GUID
(like the LED control) I get a ENOENT error, the same applies for
other GUID, although some, like the h264 extension, will work just
fine:
VideoControl Interface Descriptor:
bLength 27
bDescriptorType 36
bDescriptorSubtype 6 (EXTENSION_UNIT)
bUnitID 12
guidExtensionCode {41769ea2-04de-e347-8b2b-f4341aff003b}
bNumControl 11
bNrPins 1
baSourceID( 0) 3
bControlSize 2
bmControls( 0) 0x07
bmControls( 1) 0x7f
iExtension 0
'uvcdynctrl --device=/dev/video1 --get_raw=12:1' returns without error:
query control size of : 46
query control flags of: 0x3
----
These mappings were working just fine in previous kernels, did
something changed in the uvc extension control API, or do you think
this is just a bug in the driver?
Regards,
Paulo
