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You're reading from  Mastering Linux Device Driver Development

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Published inJan 2021
PublisherPackt
ISBN-139781789342048
Edition1st Edition
Concepts
Embedded Systems
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John Madieu
John Madieu
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John Madieu

John Madieu is an embedded Linux and kernel engineer living in Paris, France. His main activities consist of developing device drivers and Board Support Packages (BSPs) for companies in domains such as IoT, automation, transport, healthcare, energy, and the military. John is the founder and chief consultant at LABCSMART, a company that provides training and services for embedded Linux and Linux kernel engineering. He is an open source and embedded systems enthusiast, convinced that it is only by sharing knowledge that we can learn more. He is passionate about boxing, which he practiced for 6 years professionally, and continues to channel this passion through training sessions that he provides voluntarily.
Read more about John Madieu

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Writing the platform class driver

The platform driver registers the PCM driver, CPU DAI driver, and their operation functions, pre-allocates buffers for PCM components, and sets playback and capture operations as applicable. In other words, the platform driver contains the audio DMA engine and audio interface drivers (for example, I2S, AC97, and PCM) for that platform.

The platform driver targets the SoC the platform is made of. It concerns the platform's DMA, which is how audio data transits between each block in the SoC, and CPU DAI, which is the path the CPU uses to send/carry audio data to/from the codec. Such a driver has two important data structures: struct snd_soc_component_driver and struct snd_soc_dai_driver. The former is responsible for DMA data management, and the latter is responsible for the parameter configuration of the DAI. However, both of these data structures have already been described while dealing with codec class drivers. Thus, this part will just deal...

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Mastering Linux Device Driver Development
Published in: Jan 2021Publisher: PacktISBN-13: 9781789342048
© 2021 Packt Publishing Limited All Rights Reserved

Author (1)

author image
John Madieu

John Madieu is an embedded Linux and kernel engineer living in Paris, France. His main activities consist of developing device drivers and Board Support Packages (BSPs) for companies in domains such as IoT, automation, transport, healthcare, energy, and the military. John is the founder and chief consultant at LABCSMART, a company that provides training and services for embedded Linux and Linux kernel engineering. He is an open source and embedded systems enthusiast, convinced that it is only by sharing knowledge that we can learn more. He is passionate about boxing, which he practiced for 6 years professionally, and continues to channel this passion through training sessions that he provides voluntarily.
Read more about John Madieu

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