I have board with CP2105. It is usb-to-serial bridge with two uart interfaces on one usb port. I've read some guides, and documentation of UDEV, but I'm stuck on creating symlinks for them. I want them to have serial ID in name. The problem is that it does not work, even with simple rules.
My rule, that should do what I want:
ACTION=="add", SUBSYSTEM=="tty", \ ATTR{idVendor}=="10c4", ATTR{idProduct}=="ea70", ENV{ID_MODEL}=="CP2105_Dual_USB_to_UART_Bridge_Controller", \ SYMLINK+="CP2105$env{ID_USB_INTERFACE_NUM}-$env{ID_SERIAL_SHORT}" Simpler attempt, that should add two symlinks with different number at the end:
ACTION=="add", SUBSYSTEM=="tty", ATTR{idVendor}=="10c4", ATTR{idProduct}=="ea70", SYMLINK+="CP2105%n" I also have one rule, that works, but does something else (prevents some other driver from writing to this device):
SUBSYSTEM=="usb", ATTR{idVendor}=="10c4", ATTR{idProduct}=="ea70", ENV{ID_MM_DEVICE_IGNORE}="1" My udevadm info output for first device:
udevadm info -q all /dev/ttyUSB0 P: /devices/pci0000:00/0000:00:14.0/usb3/3-5/3-5.3/3-5.3:1.0/ttyUSB0/tty/ttyUSB0 N: ttyUSB0 S: serial/by-id/usb-Silicon_Labs_CP2105_Dual_USB_to_UART_Bridge_Controller_0087144E-if00-port0 S: serial/by-path/pci-0000:00:14.0-usb-0:5.3:1.0-port0 E: DEVLINKS=/dev/serial/by-path/pci-0000:00:14.0-usb-0:5.3:1.0-port0 /dev/serial/by-id/usb-Silicon_Labs_CP2105_Dual_USB_to_UART_Bridge_Controller_0087144E-if00-port0 E: DEVNAME=/dev/ttyUSB0 E: DEVPATH=/devices/pci0000:00/0000:00:14.0/usb3/3-5/3-5.3/3-5.3:1.0/ttyUSB0/tty/ttyUSB0 E: ID_BUS=usb E: ID_MM_CANDIDATE=1 E: ID_MODEL=CP2105_Dual_USB_to_UART_Bridge_Controller E: ID_MODEL_ENC=CP2105\x20Dual\x20USB\x20to\x20UART\x20Bridge\x20Controller E: ID_MODEL_FROM_DATABASE=CP210x UART Bridge E: ID_MODEL_ID=ea70 E: ID_PATH=pci-0000:00:14.0-usb-0:5.3:1.0 E: ID_PATH_TAG=pci-0000_00_14_0-usb-0_5_3_1_0 E: ID_PCI_CLASS_FROM_DATABASE=Serial bus controller E: ID_PCI_INTERFACE_FROM_DATABASE=XHCI E: ID_PCI_SUBCLASS_FROM_DATABASE=USB controller E: ID_REVISION=0100 E: ID_SERIAL=Silicon_Labs_CP2105_Dual_USB_to_UART_Bridge_Controller_0087144E E: ID_SERIAL_SHORT=0087144E E: ID_TYPE=generic E: ID_USB_DRIVER=cp210x E: ID_USB_INTERFACES=:ff0000: E: ID_USB_INTERFACE_NUM=00 E: ID_VENDOR=Silicon_Labs E: ID_VENDOR_ENC=Silicon\x20Labs E: ID_VENDOR_FROM_DATABASE=Cygnal Integrated Products, Inc. E: ID_VENDOR_ID=10c4 E: MAJOR=188 E: MINOR=0 E: SUBSYSTEM=tty E: TAGS=:systemd: E: USEC_INITIALIZED=5571337818 And the second one:
udevadm info -q all /dev/ttyUSB1 P: /devices/pci0000:00/0000:00:14.0/usb3/3-5/3-5.3/3-5.3:1.1/ttyUSB1/tty/ttyUSB1 N: ttyUSB1 S: serial/by-id/usb-Silicon_Labs_CP2105_Dual_USB_to_UART_Bridge_Controller_0087144E-if01-port0 S: serial/by-path/pci-0000:00:14.0-usb-0:5.3:1.1-port0 E: DEVLINKS=/dev/serial/by-path/pci-0000:00:14.0-usb-0:5.3:1.1-port0 /dev/serial/by-id/usb-Silicon_Labs_CP2105_Dual_USB_to_UART_Bridge_Controller_0087144E-if01-port0 E: DEVNAME=/dev/ttyUSB1 E: DEVPATH=/devices/pci0000:00/0000:00:14.0/usb3/3-5/3-5.3/3-5.3:1.1/ttyUSB1/tty/ttyUSB1 E: ID_BUS=usb E: ID_MM_CANDIDATE=1 E: ID_MODEL=CP2105_Dual_USB_to_UART_Bridge_Controller E: ID_MODEL_ENC=CP2105\x20Dual\x20USB\x20to\x20UART\x20Bridge\x20Controller E: ID_MODEL_FROM_DATABASE=CP210x UART Bridge E: ID_MODEL_ID=ea70 E: ID_PATH=pci-0000:00:14.0-usb-0:5.3:1.1 E: ID_PATH_TAG=pci-0000_00_14_0-usb-0_5_3_1_1 E: ID_PCI_CLASS_FROM_DATABASE=Serial bus controller E: ID_PCI_INTERFACE_FROM_DATABASE=XHCI E: ID_PCI_SUBCLASS_FROM_DATABASE=USB controller E: ID_REVISION=0100 E: ID_SERIAL=Silicon_Labs_CP2105_Dual_USB_to_UART_Bridge_Controller_0087144E E: ID_SERIAL_SHORT=0087144E E: ID_TYPE=generic E: ID_USB_DRIVER=cp210x E: ID_USB_INTERFACES=:ff0000: E: ID_USB_INTERFACE_NUM=01 E: ID_VENDOR=Silicon_Labs E: ID_VENDOR_ENC=Silicon\x20Labs E: ID_VENDOR_FROM_DATABASE=Cygnal Integrated Products, Inc. E: ID_VENDOR_ID=10c4 E: MAJOR=188 E: MINOR=1 E: SUBSYSTEM=tty E: TAGS=:systemd: E: USEC_INITIALIZED=5570324399 Can anybody help?
