16b2bb7fe5
Add documentation for v1 of the GPIO character device userspace API to the obsolete section of both the admin-guide and userspace-api books. Signed-off-by: Kent Gibson <warthog618@gmail.com> Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
50 lines
1.0 KiB
ReStructuredText
50 lines
1.0 KiB
ReStructuredText
.. SPDX-License-Identifier: GPL-2.0
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.. _GPIO_GET_LINEINFO_UNWATCH_IOCTL:
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*******************************
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GPIO_GET_LINEINFO_UNWATCH_IOCTL
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*******************************
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Name
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====
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GPIO_GET_LINEINFO_UNWATCH_IOCTL - Disable watching a line for changes to its
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requested state and configuration information.
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Synopsis
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========
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.. c:macro:: GPIO_GET_LINEINFO_UNWATCH_IOCTL
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``int ioctl(int chip_fd, GPIO_GET_LINEINFO_UNWATCH_IOCTL, u32 *offset)``
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Arguments
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=========
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``chip_fd``
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The file descriptor of the GPIO character device returned by `open()`.
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``offset``
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The offset of the line to no longer watch.
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Description
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===========
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Remove the line from the list of lines being watched on this ``chip_fd``.
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This is the reverse of gpio-v2-get-lineinfo-watch-ioctl.rst (v2) and
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gpio-get-lineinfo-watch-ioctl.rst (v1).
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Unwatching a line that is not watched is an error (**EBUSY**).
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First added in 5.7.
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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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