Multi-Tech Systems MT9234MU manual Device Files

Appendix B – Linux Installations

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.

32 Multi-Tech Systems, Inc. MT9234MU User Guide (S000409C)