Utilizo varios adaptadores USB a serie idénticos con mi computadora portátil (Ubuntu 9.10). Los adaptadores son fabricados por Sabrent y están construidos alrededor de un Prolific PL2303 IC, como se muestra en lsusb
:
Bus 001 Device 008: ID 067b:2303 Prolific Technology, Inc. PL2303 Serial Port
Bus 001 Device 007: ID 067b:2303 Prolific Technology, Inc. PL2303 Serial Port
Bus 001 Device 006: ID 067b:2303 Prolific Technology, Inc. PL2303 Serial Port
Ninguno de los atributos mostrados por udevadm
parece ser exclusivo de un adaptador en particular:
foo@bar:~$ udevadm info --attribute-walk --path=/sys/bus/usb-serial/devices/ttyUSB0
looking at device
'/devices/pci0000:00/0000:00:1d.7/usb1/1-4/1-4.1/1-4.1:1.0/ttyUSB0':
KERNEL=="ttyUSB0"
SUBSYSTEM=="usb-serial"
DRIVER=="pl2303"
ATTR{port_number}=="0"
looking at parent device
'/devices/pci0000:00/0000:00:1d.7/usb1/1-4/1-4.1/1-4.1:1.0':
KERNELS=="1-4.1:1.0"
SUBSYSTEMS=="usb"
DRIVERS=="pl2303"
ATTRS{bInterfaceNumber}=="00"
ATTRS{bAlternateSetting}==" 0"
ATTRS{bNumEndpoints}=="03"
ATTRS{bInterfaceClass}=="ff"
ATTRS{bInterfaceSubClass}=="00"
ATTRS{bInterfaceProtocol}=="00"
ATTRS{modalias}=="usb:v067Bp2303d0300dc00dsc00dp00icFFisc00ip00"
ATTRS{supports_autosuspend}=="1"
looking at parent device
'/devices/pci0000:00/0000:00:1d.7/usb1/1-4/1-4.1':
KERNELS=="1-4.1"
SUBSYSTEMS=="usb"
DRIVERS=="usb"
ATTRS{configuration}==""
ATTRS{bNumInterfaces}==" 1"
ATTRS{bConfigurationValue}=="1"
ATTRS{bmAttributes}=="80"
ATTRS{bMaxPower}=="100mA"
ATTRS{urbnum}=="538"
ATTRS{idVendor}=="067b"
ATTRS{idProduct}=="2303"
ATTRS{bcdDevice}=="0300"
ATTRS{bDeviceClass}=="00"
ATTRS{bDeviceSubClass}=="00"
ATTRS{bDeviceProtocol}=="00"
ATTRS{bNumConfigurations}=="1"
ATTRS{bMaxPacketSize0}=="64"
ATTRS{speed}=="12"
ATTRS{busnum}=="1"
ATTRS{devnum}=="6"
ATTRS{version}==" 1.10"
ATTRS{maxchild}=="0"
ATTRS{quirks}=="0x0"
ATTRS{authorized}=="1"
ATTRS{manufacturer}=="Prolific Technology Inc."
ATTRS{product}=="USB-Serial Controller"
<snip>
foo@bar:~$ udevadm info --attribute-walk --path=/sys/bus/usb-serial/devices/ttyUSB1
looking at device
'/devices/pci0000:00/0000:00:1d.7/usb1/1-4/1-4.5/1-4.5:1.0/ttyUSB1':
KERNEL=="ttyUSB1"
SUBSYSTEM=="usb-serial"
DRIVER=="pl2303"
ATTR{port_number}=="0"
looking at parent device
'/devices/pci0000:00/0000:00:1d.7/usb1/1-4/1-4.5/1-4.5:1.0':
KERNELS=="1-4.5:1.0"
SUBSYSTEMS=="usb"
DRIVERS=="pl2303"
ATTRS{bInterfaceNumber}=="00"
ATTRS{bAlternateSetting}==" 0"
ATTRS{bNumEndpoints}=="03"
ATTRS{bInterfaceClass}=="ff"
ATTRS{bInterfaceSubClass}=="00"
ATTRS{bInterfaceProtocol}=="00"
ATTRS{modalias}=="usb:v067Bp2303d0300dc00dsc00dp00icFFisc00ip00"
ATTRS{supports_autosuspend}=="1"
looking at parent device
'/devices/pci0000:00/0000:00:1d.7/usb1/1-4/1-4.5':
KERNELS=="1-4.5"
SUBSYSTEMS=="usb"
DRIVERS=="usb"
ATTRS{configuration}==""
ATTRS{bNumInterfaces}==" 1"
ATTRS{bConfigurationValue}=="1"
ATTRS{bmAttributes}=="80"
ATTRS{bMaxPower}=="100mA"
ATTRS{urbnum}=="69"
ATTRS{idVendor}=="067b"
ATTRS{idProduct}=="2303"
ATTRS{bcdDevice}=="0300"
ATTRS{bDeviceClass}=="00"
ATTRS{bDeviceSubClass}=="00"
ATTRS{bDeviceProtocol}=="00"
ATTRS{bNumConfigurations}=="1"
ATTRS{bMaxPacketSize0}=="64"
ATTRS{speed}=="12"
ATTRS{busnum}=="1"
ATTRS{devnum}=="7"
ATTRS{version}==" 1.10"
ATTRS{maxchild}=="0"
ATTRS{quirks}=="0x0"
ATTRS{authorized}=="1"
ATTRS{manufacturer}=="Prolific Technology Inc."
ATTRS{product}=="USB-Serial Controller"
<snip>
Todos los adaptadores están conectados a un solo concentrador USB. Dado que no puedo distinguir entre los adaptadores, ¿hay alguna forma de escribir una regla udev que corrija el nombre de cada adaptador según el puerto físico en el que está conectado el adaptador?