* UVC ioctl call is failing
@ 2019-06-28 11:37 Manoj Tiwary
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From: Manoj Tiwary @ 2019-06-28 11:37 UTC (permalink / raw)
To: kernelnewbies
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Hi All,
I have iCatch camera connected to my ubuntu 16.04 desktop, I'm trying to
use GET_CUR and SET_CUR commands to control the camera Extension Unit.
I have a common api for both get and set which first queries the camera
with get_len and then send get or set command.
But When I call a set or get command repeatedly without any delay, the
ioctl is failing due to timeout, If I set UVC_CTRL_CONTROL_TIMEOUT to 0
(infinite) or more or delay between (min 2 sec ) get and set commands It
will complete successfully.
But same thing is working when I tried in windows.
Is delay required between repeated ioctl calls? If so, why?
Thank you,
manoj
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