The Linux/Android driver Tool Folder is below.

Kernels 3.18 and above are included by default, but there are also patches for Kernels 3.14-3.17, so please refer to the User's Guide for detailed explanations and usage.
* Kernels 3.13 and below are not supported.

Tool Folder
http://www.ti.com/tool/OPT3001SW-LINUX

User's Guide
https://e2e.ti.com/cfs-file/__key/communityserver-wikis-components-files/00-00-00-03-28/opt3001_2D00...

Also, the latest code is available below.
https://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git/tree/drivers/iio/light/opt3001.c