On Sun, Mar 12, 2017 at 05:59:28PM -0300, Mauro Carvalho Chehab wrote:
> Yet, udev/systemd has some rules that provide an unique name for V4L
> devices at /lib/udev/rules.d/60-persistent-v4l.rules. Basically, it
> runs a small application (v4l_id) with creates a persistent symling
> using rules like this:
>
> KERNEL=="video*", ENV{ID_SERIAL}=="?*",
> SYMLINK+="v4l/by-id/$env{ID_BUS}-$env{ID_SERIAL}-video-index$attr{index}"
>
> Those names are stored at /dev/v4l/by-path.
This doesn't help:
$ ls -Al /dev/v4l/by-id/
total 0
lrwxrwxrwx 1 root root 13 Mar 12 19:54
usb-Sonix_Technology_Co.__Ltd._USB_2.0_Camera-video-index0 -> ../../video10
$ ls -Al /dev/v4l/by-path/
total 0
lrwxrwxrwx 1 root root 12 Mar 12 19:54 platform-2040000.vpu-video-index0 ->
../../video0
lrwxrwxrwx 1 root root 12 Mar 12 19:54 platform-2040000.vpu-video-index1 ->
../../video1
lrwxrwxrwx 1 root root 12 Mar 12 20:53 platform-capture-subsystem-video-index0
-> ../../video2
lrwxrwxrwx 1 root root 12 Mar 12 20:53 platform-capture-subsystem-video-index1
-> ../../video3
lrwxrwxrwx 1 root root 12 Mar 12 20:53 platform-capture-subsystem-video-index2
-> ../../video4
lrwxrwxrwx 1 root root 12 Mar 12 20:53 platform-capture-subsystem-video-index3
-> ../../video5
lrwxrwxrwx 1 root root 12 Mar 12 20:53 platform-capture-subsystem-video-index4
-> ../../video6
lrwxrwxrwx 1 root root 12 Mar 12 20:53 platform-capture-subsystem-video-index5
-> ../../video7
lrwxrwxrwx 1 root root 12 Mar 12 20:53 platform-capture-subsystem-video-index6
-> ../../video8
lrwxrwxrwx 1 root root 12 Mar 12 20:53 platform-capture-subsystem-video-index7
-> ../../video9
lrwxrwxrwx 1 root root 13 Mar 12 19:54
platform-ci_hdrc.0-usb-0:1:1.0-video-index0 -> ../../video10
The problem is the "platform-capture-subsystem-video-index" entries.
These themselves change order. For instance, I now have:
- entity 72: ipu1_csi0 capture (1 pad, 1 link)
type Node subtype V4L flags 0
device node name /dev/video6
which means it's platform-capture-subsystem-video-index4. Before, it
was platform-capture-subsystem-video-index2.
--
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