Re: Possible problem with stk1160 driver

[Ezequiel Garcia <ezequiel.garcia@free-electrons.com>]

Hi Sergei,

On Wed, Jul 17, 2013 at 12:04:18AM +0200, Sergey 'Jin' Bostandzhyan wrote:
> 
> I am not quite sure if the problem is in the driver or if the user space
> applications are doing something in a weird or wrong way, I hope you can
> help me.
> 
> I have one of those easycap 4x-input devices with a Syntek chip:
> Bus 001 Device 002: ID 05e1:0408 Syntek Semiconductor Co., Ltd STK1160 Video Capture Device
> 
> I'm on 3.9.9-201.fc18.i686.PAE kernel, using the stk1160 driver.
> 
> It generally works fine, I can, for example, open the video device using VLC,
> select one of the inputs and get the picture.
> 
> However, programs like motion or zoneminder fail, I am not quite sure if it
> is something that they might be doing or if it is a problem in the driver.
> 
> Basically, for both of the above, the problem is that VIDIOC_S_INPUT fails
> with EBUSY.
> 
> I do not see any errors in the message log, only:
> Jul 16 21:27:24 localhost kernel: [ 9477.574448] stk1160: queue_setup: buffer
> +count 8, each 829440 bytes
> Jul 16 21:27:24 localhost kernel: [ 9477.595667] stk1160: setting alternate 5
> 
> I somewhat assume that it works with VLC because when switching the input you
> more or less "open a new device", while zoneminder/motion might try to
> change the input while actually streaming.
> 
> I'd appreciate any help or hint, also in case if you think that it's not the
> driver issue, maybe you have an idea what I should be looking for (i.e.
> what other operations might cause the VIDIOC_S_INPUT ioctl to fail?).
> 

Let me try those applications and see what I find. From what you
describe I believe your suspicious might be accurate, but let me check
first.

Thanks,
-- 
Ezequiel García, Free Electrons
Embedded Linux, Kernel and Android Engineering
http://free-electrons.com