xref: /linux/Documentation/userspace-api/gpio/gpio-v2-line-set-values-ioctl.rst (revision ae22a94997b8a03dcb3c922857c203246711f9d4) 
1.. SPDX-License-Identifier: GPL-2.0
2
3.. _GPIO_V2_LINE_SET_VALUES_IOCTL:
4
5*****************************
6GPIO_V2_LINE_SET_VALUES_IOCTL
7*****************************
8
9Name
10====
11
12GPIO_V2_LINE_SET_VALUES_IOCTL - Set the values of requested output lines.
13
14Synopsis
15========
16
17.. c:macro:: GPIO_V2_LINE_SET_VALUES_IOCTL
18
19``int ioctl(int req_fd, GPIO_V2_LINE_SET_VALUES_IOCTL, struct gpio_v2_line_values *values)``
20
21Arguments
22=========
23
24``req_fd``
25    The file descriptor of the GPIO character device, as returned in the
26    :c:type:`request.fd<gpio_v2_line_request>` by gpio-v2-get-line-ioctl.rst.
27
28``values``
29    The :c:type:`line_values<gpio_v2_line_values>` to set with the ``mask`` set
30    to indicate the subset of requested lines to set and ``bits`` set to
31    indicate the new value.
32
33Description
34===========
35
36Set the values of requested output lines.
37
38Only the values of output lines may be set.
39Attempting to set the value of an input line is an error (**EPERM**).
40
41Return Value
42============
43
44On success 0.
45
46On error -1 and the ``errno`` variable is set appropriately.
47Common error codes are described in error-codes.rst.
48