56 lines
1.5 KiB
ReStructuredText
56 lines
1.5 KiB
ReStructuredText
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.. SPDX-License-Identifier: GPL-2.0
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.. _GPIO_HANDLE_SET_LINE_VALUES_IOCTL:
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*********************************
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GPIO_HANDLE_SET_LINE_VALUES_IOCTL
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*********************************
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.. warning::
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This ioctl is part of chardev_v1.rst and is obsoleted by
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gpio-v2-line-set-values-ioctl.rst.
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Name
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====
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GPIO_HANDLE_SET_LINE_VALUES_IOCTL - Set the values of all requested output lines.
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Synopsis
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========
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.. c:macro:: GPIO_HANDLE_SET_LINE_VALUES_IOCTL
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``int ioctl(int handle_fd, GPIO_HANDLE_SET_LINE_VALUES_IOCTL, struct gpiohandle_data *values)``
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Arguments
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=========
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``handle_fd``
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The file descriptor of the GPIO character device, as returned in the
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:c:type:`request.fd<gpiohandle_request>` by gpio-get-linehandle-ioctl.rst.
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``values``
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The :c:type:`line_values<gpiohandle_data>` to set.
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Description
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===========
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Set the values of all requested output lines.
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The values set are logical, indicating if the line is to be active or inactive.
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The ``GPIOHANDLE_REQUEST_ACTIVE_LOW`` flag controls the mapping between logical
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values (active/inactive) and physical values (high/low).
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If ``GPIOHANDLE_REQUEST_ACTIVE_LOW`` is not set then active is high and
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inactive is low. If ``GPIOHANDLE_REQUEST_ACTIVE_LOW`` is set then active is low
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and inactive is high.
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Only the values of output lines may be set.
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Attempting to set the value of input lines is an error (**EPERM**).
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Return Value
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============
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On success 0.
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On error -1 and the ``errno`` variable is set appropriately.
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Common error codes are described in error-codes.rst.
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