BCM2835 Audio

modulename: snd-bcm2835.ko

configname: CONFIG_SND_BCM2835

Linux Kernel Configuration
└─>Device Drivers
└─>Staging drivers
└─>Broadcom VideoCore support
└─>Advanced Linux Sound Architecture
└─>BCM2835 Audio
In linux kernel since version 3.10 (release Date: 2013-06-30)  
Say Y or M if you want to support BCM2835 built in audio.
This driver handles both 3.5mm and HDMI audio, by leveraging
the VCHIQ messaging interface between the kernel and the firmware
running on VideoCore.

source code:
drivers/staging/vc04_services/bcm2835-audio/