Feat/i2c write

Created by: AndreasGeissler

Hello,

I would like to introduce a new version of the 13Z077-90 native driver:

This version was created to enable access to the bit-banging I2C interface of the FPGA and to provide read and write functions for a connected EEPROM with a MAC address. This functionality was copied from the windows driver and adapted for Linux.

To access the I2C a sysfs note will be created by the driver called z77_eeprod_mac. This note can be found at: /sys/class/net/<interface name>/z77_eeprod_mac

In addition a new module parameter was added to select if the sysfs note is created or not, to prevent a customer from accidentally changing the MAC address:

maceepromacc

• 0 no sysfs note will be created
• !=0 create sysfs note z77_eeprod_mac to access EEPROM attached to FPGA

Usage: To create the sysfs note load the driver as followed: # modprobe men_lx_z77 maceepromacc=1

To read the MAC address : # sudo cat /sys/class/net/<interface name>/z77_eeprod_mac

To write the MAC address : # sudo sh -c 'echo -n <MAC address> > /sys/class/net/<interface name>/z77_eeprod_mac'

The MAC address must have the following format: "12:34:56:78:9a:bc"

Before adding these changes, please check the diff, make a code review and perform a full functional test of the 13Z077-90. This driver is used in many projects and the new driver version has not been tested completely yet.

Any remarks, wishes or questions are welcome

Regards, Andreas