.. 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.