Ok, nevertheless thank your for your reply.
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Sebastian Süsens Tel. +49 4321 559 56-27
mycable GmbH Fax +49 4321 559 56-10
Gartenstrasse 10
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----- Ursprüngliche Mail -----
Von: "Hans Verkuil" <hverk...@xs4all.nl>
An: "Sebastian Süsens" <s...@mycable.de>
CC: "linux-media" <linux-media@vger.kernel.org>
Gesendet: Montag, 3. Dezember 2018 11:06:29
Betreff: Re: v4l controls API
On 12/03/2018 11:03 AM, Sebastian Süsens wrote:
> Hey,
>
> I use the driver mx6s_capture kernel 4.9.88
> On the device tree it is registered with following name "fsl,imx6s-csi".
Ah, that's probably the freescale driver. We don't support that. It's known
to be quite buggy.
Sorry, you're on your own here.
Regards,
Hans
>
> Hint:
> I have no sub-devices on my systems only /dev/video0
>
> ------------------------------------------------------------------------
> Sebastian Süsens Tel. +49 4321 559 56-27
> mycable GmbH Fax +49 4321 559 56-10
> Gartenstrasse 10
> 24534 Neumuenster, Germany Email s...@mycable.de
> ------------------------------------------------------------------------
> mycable GmbH, Managing Director: Michael Carstens-Behrens
> USt-IdNr: DE 214 231 199, Amtsgericht Kiel, HRB 1797 NM
> ------------------------------------------------------------------------
> This e-mail and any files transmitted with it are confidential and
> intended solely for the use of the individual or entity to whom
> they are addressed. If you have received this e-mail in error,
> please notify the sender and delete all copies from your system.
> ------------------------------------------------------------------------
>
> ----- Ursprüngliche Mail -----
> Von: "Hans Verkuil" <hverk...@xs4all.nl>
> An: "Sebastian Süsens" <s...@mycable.de>, "linux-media"
> <linux-media@vger.kernel.org>
> Gesendet: Montag, 3. Dezember 2018 09:29:14
> Betreff: Re: v4l controls API
>
> On 12/03/2018 09:02 AM, Sebastian Süsens wrote:
>> Hello,
>>
>> I don't know how to get access to the v4l controls on a I2C camera sensor.
>>
>> My driver structure looks following:
>>
>> bridge driver -> csi-driver
>> -> sensor driver (includes controls)
>> register-async-notifer for csi driver register-async-notifer for
>> sensor driver
>> register video device
>>
>> The v4l2 API say:
>> When a sub-device is registered with a V4L2 driver by calling
>> v4l2_device_register_subdev() and the ctrl_handler fields of both
>> v4l2_subdev and v4l2_device are set, then the controls of the subdev will
>> become automatically available in the V4L2 driver as well. If the subdev
>> driver contains controls that already exist in the V4L2 driver, then those
>> will be skipped (so a V4L2 driver can always override a subdev control).
>>
>> But how can I get access to the controls by asynchronous registration,
>> because the controls are not added to the video device automatically?
>
> Yes, they are via v4l2_device_register_subdev(), which is called by the async
> code
> when the subdev driver arrives.
>
> Note that this assumes that the bridge driver has a control handler that
> struct
> v4l2_device points to (the ctrl_handler field).
>
> Also note that certain types of drivers (media controller-based) such as the
> imx
> driver do not 'inherit' controls since each subdev has its own v4l-subdevX
> device node
> through which its controls can be set. You do not mention which bridge driver
> you are
> using, so I can't tell whether or not it falls in this category.
>
> Regards,
>
> Hans
>
>>
>> Normally I can use:
>>
>> v4l2-ctl -l -d /dev/video0
>>
>> I don't know if this forum is the right place for this question, so please
>> answer with a private e-mail s...@mycable.de
>>
>> ------------------------------------------------------------------------
>> Sebastian Süsens Tel. +49 4321 559 56-27
>> mycable GmbH Fax +49 4321 559 56-10
>> Gartenstrasse 10
>> 24534 Neumuenster, Germany Email s...@mycable.de
>> ------------------------------------------------------------------------
>> mycable GmbH, Managing Director: Michael Carstens-Behrens
>> USt-IdNr: DE 214 231 199, Amtsgericht Kiel, HRB 1797 NM
>> ------------------------------------------------------------------------
>> This e-mail and any files transmitted with it are confidential and
>> intended solely for the use of the individual or entity to whom
>> they are addressed. If you have received this e-mail in error,
>> please notify the sender and delete all copies from your system.
>> ------------------------------------------------------------------------
>>
