gpio: userspace tools

Fri Aug 31 02:31:58 EDT 2018

Hi All,

I’m using v4.4 kernel and I see that gpiochipN are created under
/sys/class/gpio. Latest kernel has three tools lsgpio, gpio-hammer and
gpio-event-mon, all these tools opens the device node under /dev/gpiochipN.
Does v4.4 kernel has any similar tools to control GPIO pins by using
/sys/class/gpio/gpiochipN?

If not, can someone point me how the GPIO pins were controlled in the older
kernel(which supports /sys/class/gpio)?

Thanks
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