32a0a0da53
Add documentation for the GPIO character device userspace API. Added to the userspace-api book, but also provide a link from the admin-guide book, as historically the GPIO documentation has been there. Signed-off-by: Kent Gibson <warthog618@gmail.com> Reviewed-by: Linus Walleij <linus.walleij@linaro.org> Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
48 lines
1.1 KiB
ReStructuredText
48 lines
1.1 KiB
ReStructuredText
.. SPDX-License-Identifier: GPL-2.0
|
|
|
|
.. _GPIO_V2_LINE_SET_VALUES_IOCTL:
|
|
|
|
*****************************
|
|
GPIO_V2_LINE_SET_VALUES_IOCTL
|
|
*****************************
|
|
|
|
Name
|
|
====
|
|
|
|
GPIO_V2_LINE_SET_VALUES_IOCTL - Set the values of requested output lines.
|
|
|
|
Synopsis
|
|
========
|
|
|
|
.. c:macro:: GPIO_V2_LINE_SET_VALUES_IOCTL
|
|
|
|
``int ioctl(int req_fd, GPIO_V2_LINE_SET_VALUES_IOCTL, struct gpio_v2_line_values *values)``
|
|
|
|
Arguments
|
|
=========
|
|
|
|
``req_fd``
|
|
The file descriptor of the GPIO character device, as returned in the
|
|
:c:type:`request.fd<gpio_v2_line_request>` by gpio-v2-get-line-ioctl.rst.
|
|
|
|
``values``
|
|
The :c:type:`line_values<gpio_v2_line_values>` to set with the ``mask`` set
|
|
to indicate the subset of requested lines to set and ``bits`` set to
|
|
indicate the new value.
|
|
|
|
Description
|
|
===========
|
|
|
|
Set the values of requested output lines.
|
|
|
|
Only the values of output lines may be set.
|
|
Attempting to set the value of an input line is an error (**EPERM**).
|
|
|
|
Return Value
|
|
============
|
|
|
|
On success 0.
|
|
|
|
On error -1 and the ``errno`` variable is set appropriately.
|
|
Common error codes are described in error-codes.rst.
|