Laurent, > > > Is there a way to make these changes when mapping the controls, or do > they > > have to be coded in the driver itself ? > > Switching the Pan Reset and Tilt Reset from integers to button should > require > a modification of the logitech.xml file only (although it might also > trigger > bugs in yet unused code paths of libwebcam/uvcdynctrl).
I gave that a go: I changed the v4l2_type element from V4L2_CTRL_TYPE_INTEGER to V4L2_CTRL_TYPE_BUTTON for both the Pan Reset and Tilt Reset mappings. Not sure how to get uvcvideo to unmap existing controls, so I rmmod/modprobe (trace=1023) it, and confirmed it lacks these mappings. Then I had to modify libwebcam to support the V4L2_CTRL_TYPE_BUTTON. To be precise, libwebcam already had the code for that but it was commented out (lines 446 to 456 in dynctrl.c). I then imported the dynamic controls with uvcdynctrl -i, and it went fine. Pan & Tilt Reset are reported as buttons, but setting a value on them does nothing and these lines are added to syslog: kernel: [57399.195259] v4l2 ioctl VIDIOC_S_CTRL, dir=rw (0xc008561c) kernel: [57399.202594] uvcvideo: Control 9/2 failure change len 6. I m not sure what the implications of the change to V4L2_CTRL_TYPE_BUTTON are (besides modifying the reported v4l2_queryctrl struct) within the driver and the way it send control values to the device. Is it anything that can be fixed ? If so how can I help ? Gilles
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