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From: Greg KH <gregkh@linuxfoundation.org>
To: linux-hotplug@vger.kernel.org
Subject: Re: Consolidating the interface for camera components
Date: Fri, 06 Dec 2019 17:57:21 +0000	[thread overview]
Message-ID: <20191206175721.GC186026@kroah.com> (raw)
In-Reply-To: <MNGy0F8hmcJu26jxhZS9eQjsTAmh1Uh_zqVhTzSeFndBaPi2lEXsbCO99Wdja9-5yaBOihwddIZbD8NTDTwerYtAUQ89wckBymIFeG5-eD0=@philipmolloy.com>

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

  reply	other threads:[~2019-12-06 17:57 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-12-06 16:50 Consolidating the interface for camera components Philip Molloy
2019-12-06 17:57 ` Greg KH [this message]
2019-12-09  3:02 Philip Molloy

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