/xr_usb_serial_common

xr_usb_serial_common kernel module for Ollie

Primary LanguageC

Exar USB Serial Driver

Upstream source: https://www.maxlinear.com/support/design-tools/software-drivers

Version 1C-BH 2021/6/12

  • Fix errors in code.
  • Update to support kernel 5.x
  • Add udev rules to load correct module/unload cdc_acm

Version 1C 2017/1/11

  • Add the 9-bit mode support.
  • Disbale the debug messages.

Version 1B, 11/6/2015

  • Fixed Bug: The conditional logic to support kernel 3.9 was incorrect(line 396 in xr_usb_serial_common.c).

Version 1A, 1/9/2015

This driver will work with any USB UART function in these Exar devices:

  • XR21V1410/1412/1414
  • XR21B1411
  • XR21B1420/1422/1424
  • XR22801/802/804

The source code has been tested on various Linux kernels from 3.6.x to 3.17.x.
This may also work with newer kernels as well.

Installation

  1. Compile and install the common usb serial driver module
  • make
  • make modules_install
  1. Copy udev rules from folder udev_rules, see README in that subfolder
  2. Plug the device into the USB host. You should see up to four devices created, typically /dev/ttyXRUSB[0-3].

Tips for Debugging

  1. Check that the USB UART is detected by the system
  • lsusb
  1. Check that the CDC-ACM driver was not installed for the Exar USB UART

  • ls /dev/tty* To remove the CDC-ACM driver and install the driver:

  • rmmod cdc-acm

  • modprobe -r usbserial

  • modprobe usbserial

  • insmod ./xr_usb_serial_common.ko

Technical Support

Send any technical questions/issues to uarttechsupport@exar.com.