Add I2C slave provider using the generic slave interface for i.MX devices

This package provides:

• kernel patches:
  1. Add the basic i2c-slave support
  2. User-space Notification support from the slave-eeprom backend
• eeprom_listener: Sample for testing the notification support
• eeprog: open source i2c-tool for testing eeproms

Go to your kernel source directory and apply the patches.

$ cd <kernel_dir>
$ git am -3 <imx_i2c_slave_support/kernel_patches>/*.patch

Rebuild you kernel

$ make

Replace zImage on your boot partition device

$ cp <kernel_dir>/arch/arm/boot/zImage /run/media/<boot_part>/

You will need to connect a master device (like a Raspberry Pi or other board that acts as the master device) to your i.mx board by connecting the I2C_SDA and I2C_SCL lines between them.

For this example we will instantiate a slave-eeprom backend device with address 0x64 on the i2c bus 0

Instantiate the slave-eeprom backend

   $ echo slave-24c02 0x64 > /sys/bus/i2c/devices/i2c-0/new_device

Dump the content of the eeprom

    $ i2cdump -y 0 0x64

The output shold look like this

     0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f    0123456789abcdef
00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00    ................
10: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00    ................
20: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00    ................
30: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00    ................

Write the date at address 0x10 using eeprog. (Check Section below to see how to build/install eeprog)

    $ cd eeprog-0.7.6-tear12
    $ date > dateFile
    $ ./eeprog -f -i dateFile /dev/i2c-0 0x64 -w 0x10

Read the contents again

    $ i2cdump -y 0 0x64

You should see the content now contains the previuos writing

     0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f    0123456789abcdef
00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00    ................
10: 54 68 75 20 4f 63 74 20 31 32 20 32 33 3a 34 38    Thu Oct 12 23:48
20: 3a 30 31 20 55 54 43 20 32 30 31 37 0a 00 00 00    :01 UTC 2017?...
30: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00    ................

Copy the eeprog-0.7.6-tear12 directory to your MASTER device and just build it with make

$ cd eeprog-0.7.6-tear12
$ make

NOTE: A prebuild binary for the eeprog (for arm v7) is already included