CONFIG_SND_MPU401_UART (not configurable)

modulename: snd-mpu401-uart.ko

configname: CONFIG_SND_MPU401_UART

Linux Kernel Configuration
└─>Device Drivers
└─>Sound card support
└─>Advanced Linux Sound Architecture
└─>SND_MPU401_UART
In linux kernel since version 2.6.20 (release Date: 2007-02-04)  
source code:
sound/drivers//mpu401//