Greg Kroah-Hartman
598cf27219
Link: https://lore.kernel.org/r/20260217200002.683975158@linuxfoundation.org Tested-by: Florian Fainelli <florian.fainelli@broadcom.com> Tested-by: Takeshi Ogasawara <takeshi.ogasawara@futuring-girl.com> Tested-by: Peter Schneider <pschneider1968@googlemail.com> Tested-by: Jon Hunter <jonathanh@nvidia.com> Tested-by: Salvatore Bonaccorso <carnil@debian.org> Tested-by: Brett A C Sheffield <bacs@librecast.net> Tested-by: Mark Brown <broonie@kernel.org> Tested-by: Luna Jernberg <droidbittin@gmail.com> Tested-by: Ronald Warsow <rwarsow@gmx.de> Tested-by: Justin M. Forbes <jforbes@fedoraproject.org> Tested-by: Ron Economos <re@w6rz.net> Tested-by: Miguel Ojeda <ojeda@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
55 lines
1.2 KiB
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55 lines
1.2 KiB
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.. SPDX-License-Identifier: GPL-2.0
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.. _GPIO_GET_LINEINFO_IOCTL:
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***********************
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GPIO_GET_LINEINFO_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-get-lineinfo-ioctl.rst.
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Name
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====
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GPIO_GET_LINEINFO_IOCTL - Get the publicly available information for a line.
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Synopsis
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========
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.. c:macro:: GPIO_GET_LINEINFO_IOCTL
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``int ioctl(int chip_fd, GPIO_GET_LINEINFO_IOCTL, struct gpioline_info *info)``
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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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``info``
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The :c:type:`line_info<gpioline_info>` to be populated, with the
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``offset`` field set to indicate the line to be collected.
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Description
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===========
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Get the publicly available information for a line.
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This information is available independent of whether the line is in use.
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.. note::
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The line info does not include the line value.
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The line must be requested using gpio-get-linehandle-ioctl.rst or
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gpio-get-lineevent-ioctl.rst to access its value.
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Return Value
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============
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On success 0 and ``info`` is populated with the chip info.
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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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