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https://github.com/dotnet/iot/issues/811
Oct 19, 2019 · Not sure this is a duplicate. #813 is about the hardware PWM driver, which (at the moment) seems to never be accessible as non-root. This is about GPIO access in general and a problem where udev was configured but does not react fast enough so that sometimes a non-root user gets permission problems and later it works.
https://github.com/intel-iot-devkit/mraa/issues/802
Aug 15, 2017 · GPIO based on sysfs does not work reliably for non-root users because of a race between udev and the MRAA application. Rasbian sets the permission of GPIO-related sysfs files using udev rules. See ...
https://www.kernel.org/doc/html/latest/block/queue-sysfs.html
Queue sysfs files¶ This text file will detail the queue files that are located in the sysfs tree for each block device. Note that stacked devices typically do not export any settings, since their queue merely functions are a remapping target. These files are the ones found in the /sys/block/xxx/queue/ directory.
https://www.kernel.org/doc/html/v4.17/driver-api/gpio/legacy.html
If neither of these options are selected, the platform does not support GPIOs through GPIO-lib and the code cannot be enabled by the user. Trivial implementations of those functions can directly use framework code, which always dispatches through the gpio_chip:
https://en.wikipedia.org/wiki/Procfs
The proc filesystem (procfs) is a special filesystem in Unix-like operating systems that presents information about processes and other system information in a hierarchical file-like structure, providing a more convenient and standardized method for dynamically accessing process data held in the kernel than traditional tracing methods or direct access to kernel memory.
https://e2e.ti.com/support/processors/f/791/t/182883?GPIO-Sysfs-Interrupt-using-Poll-not-Working
I'm trying to get GPIO Interrrupt functionality working using sysfs and poll calls. The problem appears to be that the poll call is always returnng immediately and is not triggering on the actualy rising edge. I have configured the kernel for this GPIO to be an input which does work correctly.
https://en.wikipedia.org/wiki/Sysfs
sysfs provides functionality similar to the sysctl mechanism found in BSD operating systems, with the difference that sysfs is implemented as a virtual file system instead of being a purpose-built kernel mechanism, and that, in Linux, sysctl configuration parameters are made available at /proc/sys/ as part of procfs, not sysfs which is mounted ...
https://patchwork.ozlabs.org/patch/1131444/
On Tue, Jul 23, 2019 at 04:21:07PM -0500, Bjorn Helgaas wrote: > On Sat, Jul 13, 2019 at 11:03:53AM -0400, Sasha Levin wrote: [...] > > > > v3: corrected Fixes: tag ...
https://opensourceforu.com/2015/05/talking-to-the-kernel-through-sysfs/
The Linux kernel provides a virtual file system called sysfs. By providing virtual files, sysfs is able to export information about various kernel sub-systems, hardware devices and associated device drivers from the kernel s device model to user space.
https://unix.stackexchange.com/questions/4884/what-is-the-difference-between-procfs-and-sysfs
What is the difference between procfs and sysfs? proc is the old one, it is more or less without rules and structure. And at some point it was decided that proc was a little too chaotic and a new way was needed. Then sysfs was created, and the new stuff that was added was put into sysfs like device information.
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