Differences

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--- docs:techref:hardware:port.gpio [2022/01/31 18:40] – [Pin Multiplexing] fix code danitool
+++ docs:techref:hardware:port.gpio [2023/07/20 01:47] (current) – Add info box about gpiod-tools, gpio sysfs has been marked obsolete and won't work correctly djfe
@@ Line 56: / Line 56: @@
 ===== Software =====
+<WRAP round info 100%>
+**The GPIO SYSFS interface has been marked as obsolete in 2015. I couldn't get the following scripts to work. This page needs an overhaul.**
+The new interface is the linux GPIO character device. One way to access it is [[https://git.kernel.org/pub/scm/libs/libgpiod/libgpiod.git/tree/README|libgpiod]].
+You can install it with the [[:packages:pkgdata:gpiod-tools]] package like this:
+<code bash>opkg update
+opkg install gpiod-tools</code>
+A good article on how to use the new CLI and why we should move on: [[https://www.thegoodpenguin.co.uk/blog/stop-using-sys-class-gpio-its-deprecated/|Stop using /sys/class/gpio – it’s deprecated]]
+The biggest differences are:
+  * The new interface isn't stateless like the old one. Processes are able to take exclusive control over a gpio line now
+  * There is a character device /dev/gpiochipX for each gpio chip found in the system
+  * TODO
+As I said: This page needs an overhaul. This info box is just to prevent people from wasting their time on a deprecated ABI.
+</WRAP>
 In linux GPIOs can be accessed through GPIO SYSFS interface: **/sys/class/gpio/**
@@ Line 329: / Line 348: @@
   - Compare the changed GPIO value which corresponding to the button held
 ===== Links =====
-  * [[http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/tree/Documentation/gpio|Kernel gpio documentation]]
+  * [[https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/driver-api/gpio|Kernel gpio documentation]]
   * [[http://www.mjmwired.net/kernel/Documentation/gpio.txt|other kernel gpio doc]]