systemd/rules.d/60-persistent-v4l.rules
Yu Watanabe 873be895ed udev: add USB revision in ID_PATH
xHCI host controller may register two (or more?) USB root hubs for USB
2.0 and USB 3.0, and devices under the hubs may have same ID_PATH.
So, to avoid the conflict, let's introduce ID_PATH_WITH_USB_REVISION
that includes the USB revision.

Closes #19406.
2023-05-20 14:27:10 +09:00

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# do not edit this file, it will be overwritten on update
ACTION=="remove", GOTO="persistent_v4l_end"
SUBSYSTEM!="video4linux", GOTO="persistent_v4l_end"
ENV{MAJOR}=="", GOTO="persistent_v4l_end"
IMPORT{program}="v4l_id $devnode"
SUBSYSTEMS=="usb", IMPORT{builtin}="usb_id"
KERNEL=="video*", ENV{ID_SERIAL}=="?*", SYMLINK+="v4l/by-id/$env{ID_BUS}-$env{ID_SERIAL}-video-index$attr{index}"
# check for valid "index" number
TEST!="index", GOTO="persistent_v4l_end"
ATTR{index}!="?*", GOTO="persistent_v4l_end"
IMPORT{builtin}="path_id"
KERNEL=="video*|vbi*", ENV{ID_PATH}=="?*", SYMLINK+="v4l/by-path/$env{ID_PATH}-video-index$attr{index}"
KERNEL=="video*|vbi*", ENV{ID_PATH_WITH_USB_REVISION}=="?*", SYMLINK+="v4l/by-path/$env{ID_PATH_WITH_USB_REVISION}-video-index$attr{index}"
KERNEL=="audio*", ENV{ID_PATH}=="?*", SYMLINK+="v4l/by-path/$env{ID_PATH}-audio-index$attr{index}"
KERNEL=="audio*", ENV{ID_PATH_WITH_USB_REVISION}=="?*", SYMLINK+="v4l/by-path/$env{ID_PATH_WITH_USB_REVISION}-audio-index$attr{index}"
LABEL="persistent_v4l_end"