Programmer for RTD266X using linux and i2c-dev

This allows you to program these devices just using a VGA cable plugged in to your graphics card (it uses the I2C bus on the DDC pins). No need to buy a programmer!

This is based on the code here (but that code uses an external USB I2C interface and MS windows).

No special requirements except i2c-dev.h, and you probably want i2cdetect from i2c-tools as well. On ubuntu you just need to do sudo apt-get install i2c-tools libi2c-dev and that's it. Then just run make.

Make sure to modprobe i2c-dev

Then run i2cdetect -l. I get the following output:

i2c-0 i2c i915 gmbus ssc I2C adapter
i2c-1 i2c i915 gmbus vga I2C adapter
i2c-2 i2c i915 gmbus panel I2C adapter
i2c-3 i2c i915 gmbus dpc I2C adapter
i2c-4 i2c i915 gmbus dpb I2C adapter
i2c-5 i2c i915 gmbus dpd I2C adapter
i2c-6 i2c DPDDC-B I2C adapter
i2c-7 i2c DPDDC-C I2C adapter
i2c-8 i2c DPDDC-D I2C adapter

Clearly i2c-1 is the i2c bus connected to the VGA DDC pins. Now I can plug a VGA cable between my laptop and the RTD2660 board and run rtd_prog -d 1 -b backup.bin to backup my firmware.

Usage: rtd_prog -d <device #> [-option[s]]
Options:
-d <device #> : Specify the i2c bus to use, e.g. -d 1 means /dev/i2c-1
-b <file> : Backup the current firmware on the RTD266X to a file
-f <file> : Flash a file to the RTD266X