Mastering Linux Device Driver Development

Chapter 6: ALSA SoC Framework – Delving into the Machine Class Drivers

While starting our ALSA SoC framework series, we noticed that neither platform nor codec class drivers are intended to work on their own. The ASoC architecture is designed in such a way that platform and codec class drivers must be bound together in order to build the audio device. This binding can be done either from a so-called machine driver or from within the device tree, each of which being machine specific. It then goes without saying that the machine driver targets a specific system, and it may change from one board to another. In this chapter, we highlight the dark side of AsoC machine class drivers and discuss specific cases we may encounter when we need to write ...