aboutsummaryrefslogtreecommitdiffstats
path: root/Documentation/usb
diff options
context:
space:
mode:
authorAndrzej Pietrasiewicz <andrzej.p@samsung.com>2014-12-16 13:56:42 (GMT)
committerFelipe Balbi <balbi@ti.com>2015-01-12 18:13:26 (GMT)
commit9c4f538bfaf696c5cb24ec58fbeba12155c56c31 (patch)
treeeae380be926ba9bc685a25faca675bd4fc4dcd98 /Documentation/usb
parent020c6f93484370672060fabebc49aed5d1a7c58f (diff)
Documentation: usb: UVC function testing
Summary of how to test UVC function of USB gadget. Signed-off-by: Andrzej Pietrasiewicz <andrzej.p@samsung.com> Signed-off-by: Felipe Balbi <balbi@ti.com>
Diffstat (limited to 'Documentation/usb')
-rw-r--r--Documentation/usb/gadget-testing.txt73
1 files changed, 73 insertions, 0 deletions
diff --git a/Documentation/usb/gadget-testing.txt b/Documentation/usb/gadget-testing.txt
index 5ac9dc7..076ac7b 100644
--- a/Documentation/usb/gadget-testing.txt
+++ b/Documentation/usb/gadget-testing.txt
@@ -18,6 +18,7 @@ provided by gadgets.
15. SOURCESINK function
16. UAC1 function
17. UAC2 function
+18. UVC function
1. ACM function
@@ -653,3 +654,75 @@ e.g.:
$ arecord -f dat -t wav -D hw:CARD=UAC2Gadget,DEV=0 | \
aplay -D default:CARD=OdroidU3
+
+18. UVC function
+================
+
+The function is provided by usb_f_uvc.ko module.
+
+Function-specific configfs interface
+------------------------------------
+
+The function name to use when creating the function directory is "uvc".
+The uvc function provides these attributes in its function directory:
+
+ streaming_interval - interval for polling endpoint for data transfers
+ streaming_maxburst - bMaxBurst for super speed companion descriptor
+ streaming_maxpacket - maximum packet size this endpoint is capable of
+ sending or receiving when this configuration is
+ selected
+
+There are also "control" and "streaming" subdirectories, each of which contain
+a number of their subdirectories. There are some sane defaults provided, but
+the user must provide the following:
+
+ control header - create in control/header, link from control/class/fs
+ and/or control/class/ss
+ streaming header - create in streaming/header, link from
+ streaming/class/fs and/or streaming/class/hs and/or
+ streaming/class/ss
+ format description - create in streaming/mjpeg and/or
+ streaming/uncompressed
+ frame description - create in streaming/mjpeg/<format> and/or in
+ streaming/uncompressed/<format>
+
+Each frame description contains frame interval specification, and each
+such specification consists of a number of lines with an inverval value
+in each line. The rules stated above are best illustrated with an example:
+
+# mkdir functions/uvc.usb0/control/header/h
+# cd functions/uvc.usb0/control/header/h
+# ln -s header/h class/fs
+# ln -s header/h class/ss
+# mkdir -p functions/uvc.usb0/streaming/uncompressed/u/360p
+# cat <<EOF > functions/uvc.usb0/streaming/uncompressed/u/360p/dwFrameInterval
+666666
+1000000
+5000000
+EOF
+# cd $GADGET_CONFIGFS_ROOT
+# mkdir functions/uvc.usb0/streaming/header/h
+# cd functions/uvc.usb0/streaming/header/h
+# ln -s ../../uncompressed/u
+# cd ../../class/fs
+# ln -s ../../header/h
+# cd ../../class/hs
+# ln -s ../../header/h
+# cd ../../class/ss
+# ln -s ../../header/h
+
+
+Testing the UVC function
+------------------------
+
+device: run the gadget, modprobe vivid
+
+# uvc-gadget -u /dev/video<uvc video node #> -v /dev/video<vivid video node #>
+
+where uvc-gadget is this program:
+http://git.ideasonboard.org/uvc-gadget.git
+
+with these patches:
+http://www.spinics.net/lists/linux-usb/msg99220.html
+
+host: luvcview -f yuv

Privacy Policy