IoT & Hardware
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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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Device and driver matching mechanism explained

Device drivers and devices are always registered with the bus. When it comes to exporting the devices that are supported by the driver, you can use driver.of_match_table, driver.of_match_table, or <bus>_driver.id_table (which is specific to the device type; for example, i2c_device.id_table or platform_device.id_table).

Each bus driver has the responsibility of providing its match function, which is run by the kernel whenever a new device or device driver is registered with this bus. That said, there are three matching mechanisms for platform devices, all of which consist of string comparison. Those matching mechanisms are based on the DT table, ACPI table, device, and driver name. Let's see how the pseudo-platform and i2c buses implement their matching functions using those mechanisms:

static int platform_match(struct device *dev,
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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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