1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
|
.. SPDX-License-Identifier: GPL-2.0
.. _GPIO_HANDLE_SET_LINE_VALUES_IOCTL:
*********************************
GPIO_HANDLE_SET_LINE_VALUES_IOCTL
*********************************
.. warning::
This ioctl is part of chardev_v1.rst and is obsoleted by
gpio-v2-line-set-values-ioctl.rst.
Name
====
GPIO_HANDLE_SET_LINE_VALUES_IOCTL - Set the values of all requested output lines.
Synopsis
========
.. c:macro:: GPIO_HANDLE_SET_LINE_VALUES_IOCTL
``int ioctl(int handle_fd, GPIO_HANDLE_SET_LINE_VALUES_IOCTL, struct gpiohandle_data *values)``
Arguments
=========
``handle_fd``
The file descriptor of the GPIO character device, as returned in the
:c:type:`request.fd<gpiohandle_request>` by gpio-get-linehandle-ioctl.rst.
``values``
The :c:type:`line_values<gpiohandle_data>` to set.
Description
===========
Set the values of all requested output lines.
The values set are logical, indicating if the line is to be active or inactive.
The ``GPIOHANDLE_REQUEST_ACTIVE_LOW`` flag controls the mapping between logical
values (active/inactive) and physical values (high/low).
If ``GPIOHANDLE_REQUEST_ACTIVE_LOW`` is not set then active is high and
inactive is low. If ``GPIOHANDLE_REQUEST_ACTIVE_LOW`` is set then active is low
and inactive is high.
Only the values of output lines may be set.
Attempting to set the value of input lines 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.
|
