Criando uma regra do udev que usa informações de um pai em seu nome SYMLINK

Question

Criando uma regra do udev que usa informações de um pai em seu nome SYMLINK

#1 resposta do (1 votos)

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Estou tentando gravar uma regra do udev para um dispositivo usb que eventualmente é carregado como um dispositivo oculto. Aqui está o udevadm info para o dispositivo:

Udevadm info starts with the device specified by the devpath and then
walks up the chain of parent devices. It prints for every device
found, all possible attributes in the udev rules key format.
A rule to match, can be composed by the attributes of the device
and the attributes from one single parent device.

  looking at device '/devices/platform/soc/3f980000.usb/usb1/1-1/1-1.2/1-1.2.3/1-1.2.3.3/1-1.2.3.3:1.0/0003:20CE:0023.0010/hidraw/hidraw15':
    KERNEL=="hidraw15"
    SUBSYSTEM=="hidraw"
    DRIVER==""

  looking at parent device '/devices/platform/soc/3f980000.usb/usb1/1-1/1-1.2/1-1.2.3/1-1.2.3.3/1-1.2.3.3:1.0/0003:20CE:0023.0010':
    KERNELS=="0003:20CE:0023.0010"
    SUBSYSTEMS=="hid"
    DRIVERS=="hid-generic"
    ATTRS{country}=="00"

  looking at parent device '/devices/platform/soc/3f980000.usb/usb1/1-1/1-1.2/1-1.2.3/1-1.2.3.3/1-1.2.3.3:1.0':
    KERNELS=="1-1.2.3.3:1.0"
    SUBSYSTEMS=="usb"
    DRIVERS=="usbhid"
    ATTRS{authorized}=="1"
    ATTRS{bAlternateSetting}==" 0"
    ATTRS{bInterfaceClass}=="03"
    ATTRS{bInterfaceNumber}=="00"
    ATTRS{bInterfaceProtocol}=="00"
    ATTRS{bInterfaceSubClass}=="00"
    ATTRS{bNumEndpoints}=="02"
    ATTRS{supports_autosuspend}=="1"

  looking at parent device '/devices/platform/soc/3f980000.usb/usb1/1-1/1-1.2/1-1.2.3/1-1.2.3.3':
    KERNELS=="1-1.2.3.3"
    SUBSYSTEMS=="usb"
    DRIVERS=="usb"
    ATTRS{authorized}=="1"
    ATTRS{avoid_reset_quirk}=="0"
    ATTRS{bConfigurationValue}=="1"
    ATTRS{bDeviceClass}=="00"
    ATTRS{bDeviceProtocol}=="00"
    ATTRS{bDeviceSubClass}=="00"
    ATTRS{bMaxPacketSize0}=="64"
    ATTRS{bMaxPower}=="100mA"
    ATTRS{bNumConfigurations}=="1"
    ATTRS{bNumInterfaces}==" 1"
    ATTRS{bcdDevice}=="0100"
    ATTRS{bmAttributes}=="c0"
    ATTRS{busnum}=="1"
    ATTRS{configuration}==""
    ATTRS{devnum}=="25"
    ATTRS{devpath}=="1.2.3.3"
    ATTRS{idProduct}=="0023"
    ATTRS{idVendor}=="20ce"
    ATTRS{ltm_capable}=="no"
    ATTRS{manufacturer}=="MCL"
    ATTRS{maxchild}=="0"
    ATTRS{product}=="Mini-Circuits"
    ATTRS{quirks}=="0x0"
    ATTRS{removable}=="unknown"
    ATTRS{speed}=="12"
    ATTRS{urbnum}=="12"
    ATTRS{version}==" 1.10"

  looking at parent device '/devices/platform/soc/3f980000.usb/usb1/1-1/1-1.2/1-1.2.3':
    KERNELS=="1-1.2.3"
    SUBSYSTEMS=="usb"
    DRIVERS=="usb"
    ATTRS{authorized}=="1"
    ATTRS{avoid_reset_quirk}=="0"
    ATTRS{bConfigurationValue}=="1"
    ATTRS{bDeviceClass}=="09"
    ATTRS{bDeviceProtocol}=="02"
    ATTRS{bDeviceSubClass}=="00"
    ATTRS{bMaxPacketSize0}=="64"
    ATTRS{bMaxPower}=="100mA"
    ATTRS{bNumConfigurations}=="1"
    ATTRS{bNumInterfaces}==" 1"
    ATTRS{bcdDevice}=="9224"
    ATTRS{bmAttributes}=="e0"
    ATTRS{busnum}=="1"
    ATTRS{configuration}==""
    ATTRS{devnum}=="6"
    ATTRS{devpath}=="1.2.3"
    ATTRS{idProduct}=="0610"
    ATTRS{idVendor}=="05e3"
    ATTRS{ltm_capable}=="no"
    ATTRS{manufacturer}=="GenesysLogic"
    ATTRS{maxchild}=="4"
    ATTRS{product}=="USB2.0 Hub"
    ATTRS{quirks}=="0x0"
    ATTRS{removable}=="fixed"
    ATTRS{speed}=="480"
    ATTRS{urbnum}=="70"
    ATTRS{version}==" 2.00"

  looking at parent device '/devices/platform/soc/3f980000.usb/usb1/1-1/1-1.2':
    KERNELS=="1-1.2"
    SUBSYSTEMS=="usb"
    DRIVERS=="usb"
    ATTRS{authorized}=="1"
    ATTRS{avoid_reset_quirk}=="0"
    ATTRS{bConfigurationValue}=="1"
    ATTRS{bDeviceClass}=="09"
    ATTRS{bDeviceProtocol}=="02"
    ATTRS{bDeviceSubClass}=="00"
    ATTRS{bMaxPacketSize0}=="64"
    ATTRS{bMaxPower}=="100mA"
    ATTRS{bNumConfigurations}=="1"
    ATTRS{bNumInterfaces}==" 1"
    ATTRS{bcdDevice}=="9224"
    ATTRS{bmAttributes}=="e0"
    ATTRS{busnum}=="1"
    ATTRS{configuration}==""
    ATTRS{devnum}=="4"
    ATTRS{devpath}=="1.2"
    ATTRS{idProduct}=="0610"
    ATTRS{idVendor}=="05e3"
    ATTRS{ltm_capable}=="no"
    ATTRS{manufacturer}=="GenesysLogic"
    ATTRS{maxchild}=="4"
    ATTRS{product}=="USB2.0 Hub"
    ATTRS{quirks}=="0x0"
    ATTRS{removable}=="removable"
    ATTRS{speed}=="480"
    ATTRS{urbnum}=="80"
    ATTRS{version}==" 2.00"

  looking at parent device '/devices/platform/soc/3f980000.usb/usb1/1-1':
    KERNELS=="1-1"
    SUBSYSTEMS=="usb"
    DRIVERS=="usb"
    ATTRS{authorized}=="1"
    ATTRS{avoid_reset_quirk}=="0"
    ATTRS{bConfigurationValue}=="1"
    ATTRS{bDeviceClass}=="09"
    ATTRS{bDeviceProtocol}=="02"
    ATTRS{bDeviceSubClass}=="00"
    ATTRS{bMaxPacketSize0}=="64"
    ATTRS{bMaxPower}=="2mA"
    ATTRS{bNumConfigurations}=="1"
    ATTRS{bNumInterfaces}==" 1"
    ATTRS{bcdDevice}=="0200"
    ATTRS{bmAttributes}=="e0"
    ATTRS{busnum}=="1"
    ATTRS{configuration}==""
    ATTRS{devnum}=="2"
    ATTRS{devpath}=="1"
    ATTRS{idProduct}=="9514"
    ATTRS{idVendor}=="0424"
    ATTRS{ltm_capable}=="no"
    ATTRS{maxchild}=="5"
    ATTRS{quirks}=="0x0"
    ATTRS{removable}=="unknown"
    ATTRS{speed}=="480"
    ATTRS{urbnum}=="55"
    ATTRS{version}==" 2.00"

  looking at parent device '/devices/platform/soc/3f980000.usb/usb1':
    KERNELS=="usb1"
    SUBSYSTEMS=="usb"
    DRIVERS=="usb"
    ATTRS{authorized}=="1"
    ATTRS{authorized_default}=="1"
    ATTRS{avoid_reset_quirk}=="0"
    ATTRS{bConfigurationValue}=="1"
    ATTRS{bDeviceClass}=="09"
    ATTRS{bDeviceProtocol}=="01"
    ATTRS{bDeviceSubClass}=="00"
    ATTRS{bMaxPacketSize0}=="64"
    ATTRS{bMaxPower}=="0mA"
    ATTRS{bNumConfigurations}=="1"
    ATTRS{bNumInterfaces}==" 1"
    ATTRS{bcdDevice}=="0409"
    ATTRS{bmAttributes}=="e0"
    ATTRS{busnum}=="1"
    ATTRS{configuration}==""
    ATTRS{devnum}=="1"
    ATTRS{devpath}=="0"
    ATTRS{idProduct}=="0002"
    ATTRS{idVendor}=="1d6b"
    ATTRS{interface_authorized_default}=="1"
    ATTRS{ltm_capable}=="no"
    ATTRS{manufacturer}=="Linux 4.9.60-1-ARCH dwc_otg_hcd"
    ATTRS{maxchild}=="1"
    ATTRS{product}=="DWC OTG Controller"
    ATTRS{quirks}=="0x0"
    ATTRS{removable}=="unknown"
    ATTRS{serial}=="3f980000.usb"
    ATTRS{speed}=="480"
    ATTRS{urbnum}=="26"
    ATTRS{version}==" 2.00"

  looking at parent device '/devices/platform/soc/3f980000.usb':
    KERNELS=="3f980000.usb"
    SUBSYSTEMS=="platform"
    DRIVERS=="dwc_otg"
    ATTRS{busconnected}=="Bus Connected = 0x1"
    ATTRS{buspower}=="Bus Power = 0x1"
    ATTRS{bussuspend}=="Bus Suspend = 0x0"
    ATTRS{devspeed}=="Device Speed = 0x0"
    ATTRS{driver_override}=="(null)"
    ATTRS{enumspeed}=="Device Enumeration Speed = 0x1"
    ATTRS{fr_interval}=="Frame Interval = 0x1d4b"
    ATTRS{ggpio}=="GGPIO = 0x00000000"
    ATTRS{gnptxfsiz}=="GNPTXFSIZ = 0x01000306"
    ATTRS{gotgctl}=="GOTGCTL = 0x001c0001"
    ATTRS{gpvndctl}=="GPVNDCTL = 0x00000000"
    ATTRS{grxfsiz}=="GRXFSIZ = 0x00000306"
    ATTRS{gsnpsid}=="GSNPSID = 0x4f54280a"
    ATTRS{guid}=="GUID = 0x2708a000"
    ATTRS{gusbcfg}=="GUSBCFG = 0x20001700"
    ATTRS{hcd_frrem}=="HCD Dump Frame Remaining"
    ATTRS{hcddump}=="HCD Dump"
    ATTRS{hnp}=="HstNegScs = 0x0"
    ATTRS{hnpcapable}=="HNPCapable = 0x1"
    ATTRS{hprt0}=="HPRT0 = 0x00001405"
    ATTRS{hptxfsiz}=="HPTXFSIZ = 0x02000406"
    ATTRS{hsic_connect}=="HSIC Connect = 0x1"
    ATTRS{inv_sel_hsic}=="Invert Select HSIC = 0x0"
    ATTRS{mode}=="Mode = 0x1"
    ATTRS{mode_ch_tim_en}=="Mode Change Ready Timer Enable = 0x0"
    ATTRS{rd_reg_test}=="Time to read GNPTXFSIZ reg 10000000 times: 1330 msecs (133 jiffies)"
    ATTRS{regdump}=="Register Dump"
    ATTRS{regoffset}=="0xffffffff"
    ATTRS{regvalue}=="invalid offset"
    ATTRS{rem_wakeup_pwrdn}==""
    ATTRS{remote_wakeup}=="Remote Wakeup Sig = 0 Enabled = 0 LPM Remote Wakeup = 0"
    ATTRS{spramdump}=="SPRAM Dump"
    ATTRS{srp}=="SesReqScs = 0x1"
    ATTRS{srpcapable}=="SRPCapable = 0x1"
    ATTRS{wr_reg_test}=="Time to write GNPTXFSIZ reg 10000000 times: 330 msecs (33 jiffies)"

  looking at parent device '/devices/platform/soc':
    KERNELS=="soc"
    SUBSYSTEMS=="platform"
    DRIVERS==""
    ATTRS{driver_override}=="(null)"

  looking at parent device '/devices/platform':
    KERNELS=="platform"
    SUBSYSTEMS==""
    DRIVERS==""

A regra que estou tentando criar deve filtrar por qualquer dispositivo usb por idVendor e idProduct , em seguida, vincule o dispositivo hidraw a attenuators/%s{devpath} . O devpath é um atributo do pai usb e não do próprio dispositivo hidraw.

Esta regra parece combinar e ligar corretamente o dispositivo usb corretamente, mas eu preciso deles para linkar com o dispositivo hidraw:

SUBSYSTEM=="usb", ATTRS{idVendor}=="20ce", ATTR{idProduct}=="0023", SYMLINK+="attenuators/%s{devpath}"

Aqui estão minhas tentativas de solução, e nenhuma delas parece funcionar:

1:

SUBSYSTEM=="usb", ATTRS{idVendor}=="20ce", ATTR{idProduct}=="0023", ENV{IS_ATTENUATOR}="t", ENV{DEV_PATH}="%s{devpath}"
SUBSYSTEM=="hidraw", ENV{IS_ATTENUATOR}=="t", SYMLINK+="attenuators/%E{DEV_PATH}"

2:

SUBSYSTEM=="usb", ATTRS{idVendor}=="20ce", ATTR{idProduct}=="0023", ENV{IS_ATTENUATOR}="t", ENV{DEV_PATH}="%s{devpath}"
ENV{IS_ATTENUATOR}!="t", GOTO="attenuator_end"
SUBSYSTEM=="hidraw", SYMLINK+="attenuators/%E{DEV_PATH}"

LABEL="attenuator_end"

3, tentando apenas referenciar atributos pai:

SUBSYSTEM=="hidraw", ATTR{idVendor}=="20ce", ATTR{idProduct}=="0023", SYMLINK+="attenuators/%s{devpath}"

Juntamente com vários testes, alguns dos quais parecem até ligar um dispositivo. Eu sinto que há algum entendimento fundamental que sinto falta aqui. Qualquer ajuda seria apreciada!

udev linux

por Lindenk 07.11.2017 / 19:41

1 resposta

Tags udev linux

Como obter o antigo pseudo-gui do mpv video player? Ver progresso do scp de outra máquina

score 1 · Answer 1

Embora possa não ser a solução mais fácil ou elegante, acabei escrevendo um script python para mover recursivamente um diretório do DEVPATH do dispositivo hidraw até encontrar um arquivo chamado 'devpath' (mantendo o barramento / porta caminho da porta usb fiscial). Uma vez encontrado, ele verifica o IDVendor e o idProduct em relação aos valores corretos (agora codificados) e imprime o devpath do dispositivo, se estiver correto.

Minhas regras terminaram assim:

SUBSYSTEM=="hidraw", PROGRAM="/path/to/script.py", SYMLINK+="attenuators/%c"

E o script é assim:

#!/usr/bin/env python3

import os, sys

path = '/sys' + os.environ["DEVPATH"]

while path != '/':
  if 'devpath' in os.listdir(path):
    with open(path + '/idVendor') as f:
      vendor = f.readline().rstrip()
    with open(path + '/idProduct') as f:
      product = f.readline().rstrip()

    if vendor != '20ce' or product != '0023':
      sys.exit(1)   

    with open(path + '/devpath') as f:
      print(f.readline().rstrip())
      sys.exit(0)
  else:
    path = os.path.dirname(path)