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https://www.kernel.org/doc/html/latest/admin-guide/gpio/index.html
gpio. GPIO Sysfs Interface for Userspace; Notes on the change from 16-bit UIDs to 32-bit UIDs; Linux support for random number generator in i8xx chipsets; Using the initial RAM disk (initrd) I/O statistics fields; Java(tm) Binary Kernel Support for Linux v1.03; IBM’s Journaled File System (JFS) for Linux; Reducing OS jitter due to per-cpu ...
Linux GPIO support includes the ability to export GPIO control and status for use with applications using sysfs. No other driver can be using the GPIO of interest. Simple tools like cat and echo can be used to quickly read the current value of a GPIO input or to set the level of a GPIO output. Configure the kernel for GPIO support in sysfs. You ...
https://www.kernel.org/doc/html/v4.17/driver-api/gpio/board.html
In the future, these flags might be extended to support more properties. Note that GPIO_LOOKUP() is just a shortcut to GPIO_LOOKUP_IDX() where idx = 0. A lookup table can then be defined as follows, with an empty entry defining its end. The ‘dev_id’ field of the table is the identifier of the device that will make use of these GPIOs.
https://www.kernel.org/doc/html/latest/admin-guide/gpio/sysfs.html
Note that this attribute will not exist if the kernel doesn’t support changing the direction of a GPIO, or it was exported by kernel code that didn’t explicitly allow userspace to reconfigure this GPIO’s direction. “value” … reads as either 0 (low) or 1 (high).
https://www.kernel.org/doc/html/v4.17/driver-api/gpio/legacy.html
Legacy GPIO Interfaces ... Note that this attribute will not exist if the kernel doesn’t support changing the direction of a GPIO, or it was exported by kernel code that didn’t explicitly allow userspace to reconfigure this GPIO’s direction. “value” ... reads as either 0 (low) or 1 (high). ...
https://www.silabs.com/community/interface/forum.topic.html/cp210x_gpio_support-mzM7
Sep 16, 2017 · Hi @vanmierlo, Brian is correct in that ther version of our driver with GPIO support has not been included in the Linux kernel due to some conflict with system level IO stuff (I am similarly lacking in expertise on the details of all of this).
https://forum.libreelec.tv/thread/12111-kernel-module-gpio-ir-sending-ir-codes/
Apr 05, 2018 · In LE8.2 this doesn't work yet, but you'll be able to do that in LE9.0 (it'll work eg in current Milhouse builds). LE9.0 uses the newer 4.14 kernel which added support for gpio-ir-tx and pwm-ir-tx.
https://www.kernel.org/doc/html/latest/driver-api/gpio/consumer.html
GPIO Descriptor Consumer Interface ... Platforms that support this type of GPIO distinguish them from other GPIOs by returning nonzero from this call: ... Interacting With the Legacy GPIO Subsystem¶ Many kernel subsystems still handle GPIOs using the legacy integer-based interface. Although it is strongly encouraged to upgrade them to the ...
https://patchwork.kernel.org/patch/11234609/
Nov 08, 2019 · Hi Fabrizio Castro, I find a kernel panic issue by gpio when I upgrade kernel to 4.4.182-cip34 with Freescale LS1021A (gpiochip is mpc8xxx series): Kernel log shows “Unable to handle kernel NULL pointer dereference at virtual address 000000b4.” ... Support 'gpio-reserved-ranges' property > > Hi Fabrizio Castro, > > > > I find a kernel panic ...
https://www.kernel.org/doc/html/latest/driver-api/gpio/index.html
ACPI support¶ void acpi_gpiochip_request_interrupts (struct gpio_chip * chip) ¶. Register isr for gpio chip ACPI events. Parameters. struct gpio_chip * chip GPIO chip. Description. ACPI5 platforms can use GPIO signaled ACPI events. These GPIO interrupts are handled by ACPI event methods which need to be called from the GPIO chip’s interrupt handler.
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