OpenWRT Auto Bind USB Device to USBIP

OpenWRT 加载设备自动执行脚本使用的是 hotplug，官方文档在

https://openwrt.org/docs/guide-user/base-system/hotplug

一般 Linux 可能要使用 udev。

此方案的设计目标是，使支持 OpenWRT 的随身路由，通过 USB/IP，改造成车载CAN采集终端，并可以支持远程实时采集、刷写。

简单的脚本如下。（此处只使用了 ETAS 的产品的 USB VID，其他诸如 Vector，IntrepidCS，Peak 等的，修改 if 的条件即可。）

/etc/hotplug/usb/99-usbcan

#!/bin/sh

# ETAS 58x
#    108c/168/*) # es582.1
#    108c/169/*) # es584.1
#    108c/15a/*) # es583.1
#    108c/159/*) # es581.4
#    108c/15b/*) # es581.4

if [ "${ACTION}" = "bind" ]; then
    if [[ "${PRODUCT}" =~ "108c/.*" ]]; then
      usbip bind -b ${DEVICENAME}
    fi
fi

if [ "${ACTION}" = "remove" ]; then
    if [[ "${PRODUCT}" =~ "108c/.*" ]]; then
      usbip unbind -b ${DEVICENAME}
    fi
fi

附上记录的日志，内容格式

"$PRODUCT detected, Action=${ACTION}, DEVICENAME=${DEVICENAME}, DEVICE_TTY=${DEVICE_TTY}, DEVPATH=${DEVPATH}"

插拔 ES582.1 的日志

108c/168/100 detected, Action=add, DEVICENAME=3-1, DEVICE_TTY=, DEVPATH=/devices/platform/usbdrd3_0/fc000000.usb/xhci-hcd.6.auto/usb3/3-1
108c/168/100 detected, Action=add, DEVICENAME=3-1:1.0, DEVICE_TTY=, DEVPATH=/devices/platform/usbdrd3_0/fc000000.usb/xhci-hcd.6.auto/usb3/3-1/3-1:1.0
108c/168/100 detected, Action=add, DEVICENAME=3-1:1.1, DEVICE_TTY=, DEVPATH=/devices/platform/usbdrd3_0/fc000000.usb/xhci-hcd.6.auto/usb3/3-1/3-1:1.1
108c/168/100 detected, Action=bind, DEVICENAME=3-1, DEVICE_TTY=, DEVPATH=/devices/platform/usbdrd3_0/fc000000.usb/xhci-hcd.6.auto/usb3/3-1

108c/168/100 detected, Action=remove, DEVICENAME=3-1:1.0, DEVICE_TTY=, DEVPATH=/devices/platform/usbdrd3_0/fc000000.usb/xhci-hcd.6.auto/usb3/3-1/3-1:1.0
108c/168/100 detected, Action=remove, DEVICENAME=3-1:1.1, DEVICE_TTY=, DEVPATH=/devices/platform/usbdrd3_0/fc000000.usb/xhci-hcd.6.auto/usb3/3-1/3-1:1.1
108c/168/100 detected, Action=unbind, DEVICENAME=3-1, DEVICE_TTY=, DEVPATH=/devices/platform/usbdrd3_0/fc000000.usb/xhci-hcd.6.auto/usb3/3-1
108c/168/100 detected, Action=remove, DEVICENAME=3-1, DEVICE_TTY=, DEVPATH=/devices/platform/usbdrd3_0/fc000000.usb/xhci-hcd.6.auto/usb3/3-1

其他已知的 USB VIDs:

Vector: 0x1248
Peak System: 0x0C72
Kvaser: 0x0BFD

也可以从Linux 内核源码里找 https://github.com/torvalds/linux/tree/master/drivers/net/can/usb