June 2017
Intermediate to advanced
478 pages
13h 14m
English
Content preview from Mastering Embedded Linux Programming - Second Edition
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The drivers: /sys/class
This is a view of the device drivers presented by their type. In other words, it is a software view rather than a hardware view. Each of the subdirectories represents a class of driver and is implemented by a component of the driver framework. For example, UART devices are managed by the tty layer, and you will find them in /sys/class/tty. Likewise, you will find network devices in /sys/class/net, input devices such as the keyboard, the touchscreen, and the mouse in /sys/class/input, and so on.
There is a symbolic link in each subdirectory for each instance of that type of device pointing to its representation in /sys/device.
To take a concrete example, let's look at the serial ports on the Versatile PB. First of all, ...
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