55 lines
1.5 KiB
ReStructuredText
55 lines
1.5 KiB
ReStructuredText
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.. SPDX-License-Identifier: GPL-2.0
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.. _GPIO_V2_LINE_SET_VALUES_IOCTL:
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*****************************
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GPIO_V2_LINE_SET_VALUES_IOCTL
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*****************************
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Name
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====
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GPIO_V2_LINE_SET_VALUES_IOCTL - Set the values of requested output lines.
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Synopsis
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========
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.. c:macro:: GPIO_V2_LINE_SET_VALUES_IOCTL
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``int ioctl(int req_fd, GPIO_V2_LINE_SET_VALUES_IOCTL, struct gpio_v2_line_values *values)``
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Arguments
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=========
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``req_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<gpio_v2_line_request>` by gpio-v2-get-line-ioctl.rst.
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``values``
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The :c:type:`line_values<gpio_v2_line_values>` to set with the ``mask`` set
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to indicate the subset of requested lines to set and ``bits`` set to
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indicate the new value.
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Description
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===========
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Set the values of 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 ``GPIO_V2_LINE_FLAG_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 ``GPIO_V2_LINE_FLAG_ACTIVE_LOW`` is not set then active is high and inactive
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is low. If ``GPIO_V2_LINE_FLAG_ACTIVE_LOW`` is set then active is low and
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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 an input line 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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