Embest SBC8140, Руководство пользователя

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3.4.5 Audio Input/Output Driver
Figure 18: Working principle of audio input/output
The ASoC embedded audio system is comprised of the following parts;
 Codec Driver:
The codec driver is platform independent and contains audio controls,
audio interface capabilities, codec DAPM definition and codec IO functions.
 Platform Driver:
The Platform driver contains the audio DMA engine and audio interface
drivers (e.g. I2S, AC97, PCM) for that platform.
 Machine Driver:
The Machine driver handles any machine specific controls and audio
events. I.e. turning on an amp at start of playback.