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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Leveraging Regmap from the user space

Register maps can be monitored from the user space via the debugfs file system. First, debugfs needs to be enabled via the CONFIG_DEBUG_FS kernel configuration option. Then, debugfs can be mounted using the following command:

mount -t debugfs none /sys/kernel/debug

After that, the debugfs register map implementation can be found under /sys/kernel/debug/regmap/. This debugfs view implemented by drivers/base/regmap/regmap-debugfs.c in kernel sources contains a register cache (mirror) for drivers/peripherals based on the Regmap API.

From the Regmap main debugfs directory, we can get the list of devices whose drivers are based on the Regmap API using the following command:

root@jetson-nano-devkit:~# ls -l /sys/kernel/debug/regmap/
drwxr-xr-x   2 root  root   0 Jan  1  1970 4-003c-power-slave
drwxr-xr-x   2 root  root   0 Jan  1...
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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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