On Fri, Dec 06, 2019 at 04:50:09PM +0000, Philip Molloy wrote:
> Hello,
>
> I'm trying to consolidate the interface for several camera components into one place to represent a single camera.
>
> Each of the camera modules includes a LED driver (0x63) and camera (0x3c) that sit behind a couple muxes. For example:
>
> /sys/devices/platform/amba/ff030000.i2c/i2c-1/i2c-3/i2c-5/5-003c/
> /sys/devices/platform/amba/ff030000.i2c/i2c-1/i2c-3/i2c-7/7-0063/
>
> The LEDs are also available under /sys/class/leds/ based on their labels as defined in the devicetree.
>
> The image data captured by the camera passes through two soft IP blocks. The driver for the second block maps the image into memory and exposes it as a block device in /dev.
>
> In #kernel-newbies on OFC it was suggested that I could use udev to symlink the above into one place in /dev, but I'm having trouble creating a symlink between /sys and /dev (e.g. /sys/.../5-003c -> /dev/camera-name/camera). Perhaps that isn't possible or intended? I've only seen symlinks between /dev and /dev in /usr/lib/udev/rules.d/*.rules on my development system.
>
> If it is I can explain what I've tried in more detail, but basically I'd like to do something like the following:
>
> DRIVER=="aptina-ar0330", SYMLINK+="camera/$attr{../../of_node/name}/$env{OF_NAME}"
>
> If it is not possible any other recommendations would be greatly appreciated.
Try asking on the linux-media mailing list as this is the API those
drivers expose.
thanks,
greg k-h
