Multi-Tech Systems MT9234MU - page 32

Appendix B – Linux Installations
32 Multi-Tech Systems, Inc. MT9234MU User Guide (S000409C)
Device Files
Because the TI USB driver does not use usbserial (to avoid known problems with usbserial) it uses its
own device file names, /dev/ttyTIUSB0, /dev/ttyTIUSB1, and so on.
The device files are created automatically when the ti_usb driver is loaded. This is done by the module
post-install command in /etc/modules.conf, which runs the script /etc/ti_usb/make_devices.
You can change the device names that ti_usb uses. First you should remove the old device files by
running
/etc/ti_usb/make_devices remove
Then edit /etc/ti_usb/make_devices. At the top of this file you will find the parameters DEVICE_NAME
which determines the basename of the TI USB device files, DEVICE_COUNT which determines the
number of device files created, DEVICE_GROUP which determines the group owner of the device files,
and DEVICE_PERMISSIONS which determines the device file permissions.
For example, to create 8 TI USB device files named /dev/ttyusb0 through /dev/ttyusb7, owned by the
uucp group, and having permissions 0660, change the parameters like this
DEVICE_NAME=/dev/ttyusb
DEVICE_COUNT=8
DEVICE_GROUP=uucp
DEVICE_PERMISSIONS=0660
After editing make_devices, run the script to create the new device files, like this
/etc/ti_usb/make_devices
If you use devfs, the ti_usb devices will be /dev/usb/ti/0, /dev/usb/ti/1, and so on in the order they are
plugged in. The ti_usb driver has not been tested with devfs.