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You're reading from  Linux Device Driver Development - Second Edition

Product typeBook
Published inApr 2022
PublisherPackt
ISBN-139781803240060
Edition2nd Edition
Concepts
Embedded Systems
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Author (1)
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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Understanding the SPI framework abstractions in the Linux kernel

The Linux kernel SPI framework is made up of a few data structures, the most important of which are the following:

  • spi_controller, used to abstract the SPI master device.
  • spi_device, used to abstract a slave device sitting on the SPI bus.
  • spi_driver, the driver of the slave device.
  • spi_transfer, which is the low-level representation of one segment of a protocol. It represents a single operation between the master and slave. It expects Tx and/or Rx buffers as well as the length of the data to be exchanged and an optional CS behavior.
  • spi_message, which is an atomic sequence of transfers.

Let's now introduce each of these data structures, one after the other, starting with the most complex, which represents the SPI controller's data structure.

Brief introduction to struct spi_controller

Throughout this chapter, we will reference the controller because it is deeply coupled with...

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Linux Device Driver Development - Second Edition
Published in: Apr 2022Publisher: PacktISBN-13: 9781803240060
© 2022 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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