Wolfson Microelectroncis WM8400 AudioPlus PMIC

modulename: wm8400-regulator.ko

configname: CONFIG_REGULATOR_WM8400

Linux Kernel Configuration
└─>Device Drivers
└─>Voltage and Current Regulator Support
└─>Wolfson Microelectroncis WM8400 AudioPlus PMIC
In linux kernel since version 2.6.28 (release Date: 2008-12-24)  
This driver provides support for the voltage regulators of the
WM8400 AudioPlus PMIC.

source code:
drivers/regulator/wm8400-regulator.c