October 2017
Intermediate to advanced
586 pages
14h 8m
English
Content preview from Linux Device Drivers Development
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Putting it all together
The driver here summarizes the concepts introduced in descriptor-based interfaces. The principle is the same, as are the GPIOs:
#include <linux/init.h> #include <linux/module.h> #include <linux/kernel.h> #include <linux/platform_device.h> /* For platform devices */ #include <linux/gpio/consumer.h> /* For GPIO Descriptor */ #include <linux/interrupt.h> /* For IRQ */ #include <linux/of.h> /* For DT*/ /* * Let us consider the below mapping in device tree: * * foo_device { * compatible = "packt,gpio-descriptor-sample"; * led-gpios = <&gpio2 15 GPIO_ACTIVE_HIGH>, // red * <&gpio2 16 GPIO_ACTIVE_HIGH>, // green * * btn1-gpios = <&gpio2 1 GPIO_ACTIVE_LOW>; * btn2-gpios = <&gpio2 31 GPIO_ACTIVE_LOW>; * }; */ static struct ...Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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