Avastar SP88W8782 wifi module Pinout 12 pin usb
Found the pinout on Aliexpress:


Some links that may help you:

http://www.aliexpress.com/store/product/Marvell-88w8782-chip-sdio-interface-high-performance-low-power-small-size-wifi-wireless-module/924751_1793202293.html

See Download section in the following link, download Application notes zip:
http://www.embeddedworks.net/wlan493.html

check out the pdf file named 88MC200_Hardware_Design_Guide (MV-S302321-00) inside the zip file. (page 15) It talks about interfacing a microcontroller to this WiFi module.