29
rated 0 times
[
29]
[
0]
/ answers: 1 / hits: 96609
/ 2 Years ago, sun, june 5, 2022, 1:50:33
I use a number of identical USB-to-serial adapters with my laptop (Ubuntu 9.10). The adapters are manufactured by Sabrent and are built around a Prolific PL2303 IC, as shown by 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
None of the attributes displayed by udevadm seem to be unique to a particular adapter:
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>
All of the adapters are plugged into a single USB hub. Since I can't distinguish between the adapters themselves, is there any way I can write a udev rule that fixes the name of each adapter based on which physical port on the hub the adapter is plugged into?
More From » usb
