[mirror_ubuntu-artful-kernel.git] / Documentation / ABI / testing / gpio-cdev

What:		/dev/gpiochip[0-9]+
Date:		November 2015
KernelVersion:	4.4
Contact:	linux-gpio@vger.kernel.org
Description:
		The character device files /dev/gpiochip* are the interface
		between GPIO chips and userspace.

		The ioctl(2)-based ABI is defined and documented in
		[include/uapi]<linux/gpio.h>.

		The following file operations are supported:

		open(2)
		Currently the only useful flags are O_RDWR.

		ioctl(2)
		Initiate various actions.
		See the inline documentation in [include/uapi]<linux/gpio.h>
		for descriptions of all ioctls.

		close(2)
		Stops and free up the I/O contexts that was associated
		with the file descriptor.

Users:		TBD
Commit	Line	Data
40c159b7 LW	1	What: /dev/gpiochip[0-9]+
	2	Date: November 2015
	3	KernelVersion: 4.4
	4	Contact: linux-gpio@vger.kernel.org
	5	Description:
	6	The character device files /dev/gpiochip* are the interface
	7	between GPIO chips and userspace.
	8
	9	The ioctl(2)-based ABI is defined and documented in
	10	[include/uapi]<linux/gpio.h>.
	11
	12	The following file operations are supported:
	13
	14	open(2)
	15	Currently the only useful flags are O_RDWR.
	16
	17	ioctl(2)
	18	Initiate various actions.
	19	See the inline documentation in [include/uapi]<linux/gpio.h>
	20	for descriptions of all ioctls.
	21
	22	close(2)
	23	Stops and free up the I/O contexts that was associated
	24	with the file descriptor.
	25
	26	Users: TBD