Searching for Sysfs Support information? Find all needed info by using official links provided below.
https://www.kernel.org/doc/html/latest/admin-guide/gpio/sysfs.html
This explicit exporting can help with debugging (by making some kinds of experiments easier), or can provide an always-there interface that’s suitable for documenting as part of a board support package. After the GPIO has been exported, gpiod_export_link() allows creating symlinks from elsewhere in sysfs to the GPIO sysfs node. Drivers can ...
https://www.linuxsecrets.com/linuxtv-wiki/mailinglists/linux-dvb/2004/05-2004/msg00400.html
Ok.. here is the patch... i hope it works. Note: This is a pre1 - not the final patch. At the moment i need help with the udev rule and some bughunters :) So as more peolpe try this patch as sooner we will have sysfs support.
https://www.ibm.com/support/knowledgecenter/SSB23S_1.1.0.13/gtpd1/d1mtprocfs.html
The process pseudo-file system (PROCFS) and system pseudo-file system (SYSFS) are created automatically when the file system is initialized using the ZFINT on bp command. ... Parent topic: Process pseudo-file system and system pseudo-file system support ...
https://github.com/matrix-io/xc3sprog/commit/57f99d9ed8f287cb491d48bf23bba97cc56acb4f
xc3sprog is a suite of utilities for programming Xilinx FPGAs, CPLDs, and EEPROMs with the Xilinx Parallel Cable and other JTAG adapters under Linux. Used to program the FPGA of the MATRIX Creator/Voice via Raspberry Pi. - matrix-io/xc3sprog
https://www.kernel.org/doc/html/v4.17/driver-api/gpio/legacy.html
This explicit exporting can help with debugging (by making some kinds of experiments easier), or can provide an always-there interface that’s suitable for documenting as part of a board support package. After the GPIO has been exported, gpio_export_link() allows creating symlinks from elsewhere in sysfs to the GPIO sysfs node.
https://www.mjmwired.net/kernel/Documentation/gpio/sysfs.txt
149 150 This explicit exporting can help with debugging (by making some kinds 151 of experiments easier), or can provide an always-there interface that's 152 suitable for documenting as part of a board support package. 153 154 After the GPIO has been exported, gpiod_export_link() allows creating 155 symlinks from elsewhere in sysfs to the GPIO ...
https://en.wikipedia.org/wiki/Sysfs
sysfs is a pseudo file system provided by the Linux kernel that exports information about various kernel subsystems, hardware devices, and associated device drivers from the kernel's device model to user space through virtual files. In addition to providing information about various devices and kernel subsystems, exported virtual files are also used for their configuration.
https://developer.ridgerun.com/wiki/index.php/How_to_use_GPIO_signals
You must have GPIO support in sysfs for this program to work (or you will not see the /sys/class/gpio directory). The gpio-int-test.c program uses poll() to wake up every 3 seconds (using poll() timeout mechanism) at which time it prints a period.
https://www.qsc.com/systems/support/q-sys-support/
Download the QSC Remote Support Portal. We use a really nifty support tool by an outfit called TeamViewer. It is very secure and simple to use. Just click the button above to download the QSC Support Portal. Choose “Run” when asked, choosing the default answers if in doubt.
General Purpose Input or Output: a generic I/O line on a SoC is often referred to as a GPIO. By definition a GPIO is a line that can be used as an input or output. In some cases vendors will to a signal that support external interrupts as a GPIO line as well.
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