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- .. SPDX-License-Identifier: GPL-2.0
- .. _GPIO_GET_LINEINFO_IOCTL:
- ***********************
- GPIO_GET_LINEINFO_IOCTL
- ***********************
- .. warning::
- This ioctl is part of chardev_v1.rst and is obsoleted by
- gpio-v2-get-lineinfo-ioctl.rst.
- Name
- ====
- GPIO_GET_LINEINFO_IOCTL - Get the publicly available information for a line.
- Synopsis
- ========
- .. c:macro:: GPIO_GET_LINEINFO_IOCTL
- ``int ioctl(int chip_fd, GPIO_GET_LINEINFO_IOCTL, struct gpioline_info *info)``
- Arguments
- =========
- ``chip_fd``
- The file descriptor of the GPIO character device returned by `open()`.
- ``info``
- The :c:type:`line_info<gpioline_info>` to be populated, with the
- ``offset`` field set to indicate the line to be collected.
- Description
- ===========
- Get the publicly available information for a line.
- This information is available independent of whether the line is in use.
- .. note::
- The line info does not include the line value.
- The line must be requested using gpio-get-linehandle-ioctl.rst or
- gpio-get-lineevent-ioctl.rst to access its value.
- Return Value
- ============
- On success 0 and ``info`` is populated with the chip info.
- On error -1 and the ``errno`` variable is set appropriately.
- Common error codes are described in error-codes.rst.
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