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FTDI FT232RL USB<->USART and new udev-197
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cz0
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Joined: 13 Jun 2005
Posts: 181
Location: /earth/russia/moscow

PostPosted: Mon Feb 11, 2013 10:26 am    Post subject: FTDI FT232RL USB<->USART and new udev-197 Reply with quote

Hello folks!
Well, seems new udev is a pain not only for me, but here is my story. Being and embedded developer for a long period, I have my AVR programmer, based on FTDI FT232RL USB to USART bridge with me for years now. Besides, I have a number of devices and some other stuff I need to talk to my PC, based on same FT232RL bridge (and all of them emerge as ttyUSBn in system). So, not to make a mess, I wrote a simple udev rule, the after my programmed is plugged in, name it as /dev/avrusb500v2 and make a symlink to this name from the original kernel device name like ttyUSBn.

cat /etc/udev/rules.d/09--avrusb500v2.rules
Code:

KERNEL=="ttyUSB[0-9]*", ATTRS{product}=="AVRUsb500v2", ATTRS{idProduct}=="6001", ATTRS{idVendor}=="0403", NAME="avrusb500v2", SYMLINK="%k", GROUP="uucp", MODE="0660"


That used to work perfectly until the udev-197 came to life. Now udev ignores this and names programmer as a regular /dev/ttyUSBn, where n - number of such devices attached to the system at this moment. Sure, I have "product" variable programmed into FT232RL EEPROM, so it shows up in lsusb -v like this:
Code:

Bus 006 Device 009: ID 0403:6001 Future Technology Devices International, Ltd FT232 USB-Serial (UART) IC
Device Descriptor:
  bLength                18
  bDescriptorType         1
  bcdUSB               2.00
  bDeviceClass            0 (Defined at Interface level)
  bDeviceSubClass         0
  bDeviceProtocol         0
  bMaxPacketSize0         8
  idVendor           0x0403 Future Technology Devices International, Ltd
  idProduct          0x6001 FT232 USB-Serial (UART) IC
  bcdDevice            6.00
  iManufacturer           1 cz0
  iProduct                2 AVRUsb500v2
  iSerial                 3 A4QTO6NI
  bNumConfigurations      1
  Configuration Descriptor:
    bLength                 9
    bDescriptorType         2
    wTotalLength           32
    bNumInterfaces          1
    bConfigurationValue     1
    iConfiguration          0
    bmAttributes         0xa0
      (Bus Powered)
      Remote Wakeup
    MaxPower               90mA
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        0
      bAlternateSetting       0
      bNumEndpoints           2
      bInterfaceClass       255 Vendor Specific Class
      bInterfaceSubClass    255 Vendor Specific Subclass
      bInterfaceProtocol    255 Vendor Specific Protocol
      iInterface              2 AVRUsb500v2
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x81  EP 1 IN
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0040  1x 64 bytes
        bInterval               0
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x02  EP 2 OUT
        bmAttributes            2
          Transfer Type            Bulk
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0040  1x 64 bytes
        bInterval               0
Device Status:     0x0000
  (Bus Powered)


Here is what udevadm monitor --kernel --udev --property shows while connecting the programmer:
Code:

monitor will print the received events for:
UDEV - the event which udev sends out after rule processing
KERNEL - the kernel uevent

KERNEL[251155.094230] add      /devices/pci0000:00/0000:00:1d.0/usb6/6-1 (usb)
ACTION=add
BUSNUM=006
DEVNAME=/dev/bus/usb/006/013
DEVNUM=013
DEVPATH=/devices/pci0000:00/0000:00:1d.0/usb6/6-1
DEVTYPE=usb_device
MAJOR=189
MINOR=652
PRODUCT=403/6001/600
SEQNUM=20692
SUBSYSTEM=usb
TYPE=0/0/0

KERNEL[251155.101071] add      /devices/pci0000:00/0000:00:1d.0/usb6/6-1/6-1:1.0 (usb)
ACTION=add
DEVPATH=/devices/pci0000:00/0000:00:1d.0/usb6/6-1/6-1:1.0
DEVTYPE=usb_interface
INTERFACE=255/255/255
MODALIAS=usb:v0403p6001d0600dc00dsc00dp00icFFiscFFipFF
PRODUCT=403/6001/600
SEQNUM=20693
SUBSYSTEM=usb
TYPE=0/0/0

KERNEL[251155.101156] add      /devices/pci0000:00/0000:00:1d.0/usb6/6-1/6-1:1.0/ttyUSB0 (usb-serial)
ACTION=add
DEVPATH=/devices/pci0000:00/0000:00:1d.0/usb6/6-1/6-1:1.0/ttyUSB0
SEQNUM=20694
SUBSYSTEM=usb-serial

KERNEL[251155.103102] add      /devices/pci0000:00/0000:00:1d.0/usb6/6-1/6-1:1.0/ttyUSB0/tty/ttyUSB0 (tty)
ACTION=add
DEVNAME=/dev/ttyUSB0
DEVPATH=/devices/pci0000:00/0000:00:1d.0/usb6/6-1/6-1:1.0/ttyUSB0/tty/ttyUSB0
MAJOR=188
MINOR=0
SEQNUM=20695
SUBSYSTEM=tty

UDEV  [251155.116463] add      /devices/pci0000:00/0000:00:1d.0/usb6/6-1 (usb)
ACTION=add
BUSNUM=006
DEVNAME=/dev/bus/usb/006/013
DEVNUM=013
DEVPATH=/devices/pci0000:00/0000:00:1d.0/usb6/6-1
DEVTYPE=usb_device
ID_BUS=usb
ID_MODEL=AVRUsb500v2
ID_MODEL_ENC=AVRUsb500v2
ID_MODEL_ID=6001
ID_PRODUCT_FROM_DATABASE=FT232 USB-Serial (UART) IC
ID_REVISION=0600
ID_SERIAL=cz0_AVRUsb500v2_A4QTO6NI
ID_SERIAL_SHORT=A4QTO6NI
ID_USB_INTERFACES=:ffffff:
ID_VENDOR=cz0
ID_VENDOR_ENC=cz0
ID_VENDOR_FROM_DATABASE=Future Technology Devices International, Ltd
ID_VENDOR_ID=0403
MAJOR=189
MINOR=652
PRODUCT=403/6001/600
SEQNUM=20692
SUBSYSTEM=usb
TYPE=0/0/0
USEC_INITIALIZED=1155094234

UDEV  [251155.117355] add      /devices/pci0000:00/0000:00:1d.0/usb6/6-1/6-1:1.0 (usb)
ACTION=add
DEVPATH=/devices/pci0000:00/0000:00:1d.0/usb6/6-1/6-1:1.0
DEVTYPE=usb_interface
ID_PRODUCT_FROM_DATABASE=FT232 USB-Serial (UART) IC
ID_VENDOR_FROM_DATABASE=Future Technology Devices International, Ltd
INTERFACE=255/255/255
MODALIAS=usb:v0403p6001d0600dc00dsc00dp00icFFiscFFipFF
PRODUCT=403/6001/600
SEQNUM=20693
SUBSYSTEM=usb
TYPE=0/0/0
USEC_INITIALIZED=55101115

UDEV  [251155.117766] add      /devices/pci0000:00/0000:00:1d.0/usb6/6-1/6-1:1.0/ttyUSB0 (usb-serial)
ACTION=add
DEVPATH=/devices/pci0000:00/0000:00:1d.0/usb6/6-1/6-1:1.0/ttyUSB0
SEQNUM=20694
SUBSYSTEM=usb-serial
USEC_INITIALIZED=55101134

UDEV  [251155.118765] add      /devices/pci0000:00/0000:00:1d.0/usb6/6-1/6-1:1.0/ttyUSB0/tty/ttyUSB0 (tty)
ACTION=add
DEVLINKS=/dev/serial/by-id/usb-cz0_AVRUsb500v2_A4QTO6NI-if00-port0 /dev/serial/by-path/pci-0000:00:1d.0-usb-0:1:1.0-port0 /dev/ttyUSB0
DEVNAME=/dev/ttyUSB0
DEVPATH=/devices/pci0000:00/0000:00:1d.0/usb6/6-1/6-1:1.0/ttyUSB0/tty/ttyUSB0
ID_BUS=usb
ID_MODEL=AVRUsb500v2
ID_MODEL_ENC=AVRUsb500v2
ID_MODEL_ID=6001
ID_PATH=pci-0000:00:1d.0-usb-0:1:1.0
ID_PATH_TAG=pci-0000_00_1d_0-usb-0_1_1_0
ID_PRODUCT_FROM_DATABASE=FT232 USB-Serial (UART) IC
ID_REVISION=0600
ID_SERIAL=cz0_AVRUsb500v2_A4QTO6NI
ID_SERIAL_SHORT=A4QTO6NI
ID_TYPE=generic
ID_USB_DRIVER=ftdi_sio
ID_USB_INTERFACES=:ffffff:
ID_USB_INTERFACE_NUM=00
ID_VENDOR=cz0
ID_VENDOR_ENC=cz0
ID_VENDOR_FROM_DATABASE=Future Technology Devices International, Ltd
ID_VENDOR_ID=0403
MAJOR=188
MINOR=0
SEQNUM=20695
SUBSYSTEM=tty
USEC_INITIALIZED=55103130


I played with rule, but without any luck. Besides, I tried to use this rule on machine, running udev-172, and it works just perfect, giving me /dev/avrusb500v2 device with a symlink to /dev/ttyUSB0. So, what should be done to get this little thing work again?
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cz0
Apprentice
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Joined: 13 Jun 2005
Posts: 181
Location: /earth/russia/moscow

PostPosted: Tue Feb 12, 2013 1:18 pm    Post subject: Reply with quote

Seems it somehow connected with NAME parameter. If I cut it out and leave only SYMLINK+="avrusb500v2", it work flawlessly, making /dev/ttyUSBn as a primary device file and a symlink /dev/avrusb500v2 , pointing to it.
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