[libcamera-devel] Compatibility with cameras

[Guido Körber]

Hi Laurent,

can’t check that at the moment but will do.

The camera supposedly contains an Omnivision OV2740 sensor.

I was hoping that we would only need to tell some existing driver to use this camera.



> Am 24.02.2022 um 16:12 schrieb Laurent Pinchart <laurent.pinchart at ideasonboard.com>:
> 
> Hi Guido,
> 
> On Thu, Feb 24, 2022 at 04:02:58PM +0100, Guido Körber wrote:
>> We can see a device on the I2C. (Took a bit more testing to get the
>> hardware to really respond…)
>> 
>> So will we need a specific kernel driver for that camera, or is there
>> some way to handle it via a generic driver?
> 
> It needs a kernel driver. Have you checked in drivers/media/i2c/ (in the
> kernel) if the sensor you're using is already supported ? If so, some
> work may still be needed to support all the features required by
> libcamera (see Documentation/sensor_driver_requirements.rst), but it
> would be much easier than writing a new driver from scratch.
> 
>>> Am 17.02.2022 um 17:43 schrieb Laurent Pinchart:
>>> On Thu, Feb 17, 2022 at 05:00:23PM +0100, Guido Körber wrote:
>>>> Is there a simple way to check if the hardware is present even if
>>>> the camera is not detected by software?
>>>> 
>>>> I have set up a prototype with a hand soldered connector and would
>>>> like to know if I did all the wiring correct.
>>> 
>>> You can use i2cdetect and i2cget ([1]) to talk to the sensor. You may
>>> need to first enable power by toggling the corresponding GPIO, which can
>>> also be done from userspace ([2]). Checking video transmission is more
>>> difficult, you will need to get at least the kernel driver for the
>>> sensor and Unicam up and running.
>>> 
>>> [1] https://manpages.debian.org/unstable/i2c-tools/i2cdetect.8.en.html
>>> [2] https://manpages.debian.org/experimental/gpiod/gpioset.1.en.html
>>> 
>>>>> Am 17.02.2022 um 14:09 schrieb Kieran Bingham:
>>>>> Quoting Guido Körber (2022-02-17 13:04:18)
>>>>>> 
>>>>>> I want to use libcamera on Raspberry with a camera that is not
>>>>>> explicitly supported by libcamera but does generic CSI-2. Will this
>>>>>> work, or do I need a camera specific plugin or something else?
>>>>> 
>>>>> You will likely need to make sure you have a relevant kernel driver, and
>>>>> may likely need to do some updates to libcamera, to manage the
>>>>> CameraSensorHelper classes.
>>>>> 
>>>>> You might also then want to follow the Raspberry Pi ISP tuning
>>>>> procedures.
>>>>> 
>>>>> https://datasheets.raspberrypi.com/camera/raspberry-pi-camera-guide.pdf
>>>>> 
>>>>> But yes, you should be able to get it to work.
> 
> -- 
> Regards,
> 
> Laurent Pinchart

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