tree 76208030c07e648a0c7daa9532fd1611ffe3a3fd
parent 92e89eb5bd184c6bdd569a2bc905bce12cad488e
author Lei YU <mine260309@gmail.com> 1573107860 +0800
committer Lei YU <mine260309@gmail.com> 1575872081 +0800

i2c: Implement write function

Implement I2CDevice::write() by invoking i2c_smbus_write_xxx() APIs.
The code is referenced from i2c-tools' i2cset.c:

 https://github.com/ev3dev/i2c-tools/blob/ev3dev-stretch/tools/i2cset.c

Tested: Verify on Witherspoon that it writes the PSU unlock upgrade
        command and boot flag successfully.

Signed-off-by: Lei YU <mine260309@gmail.com>
Change-Id: I9fb014c787ef3ebb2f7793a0d012b1d652ef069f