1.. SPDX-License-Identifier: GPL-2.0 2 3.. _GPIO_V2_LINE_SET_CONFIG_IOCTL: 4 5***************************** 6GPIO_V2_LINE_SET_CONFIG_IOCTL 7***************************** 8 9Name 10==== 11 12GPIO_V2_LINE_SET_CONFIG_IOCTL - Update the configuration of previously requested lines. 13 14Synopsis 15======== 16 17.. c:macro:: GPIO_V2_LINE_SET_CONFIG_IOCTL 18 19``int ioctl(int req_fd, GPIO_V2_LINE_SET_CONFIG_IOCTL, struct gpio_v2_line_config *config)`` 20 21Arguments 22========= 23 24``req_fd`` 25 The file descriptor of the GPIO character device, as returned in the 26 :c:type:`request.fd<gpio_v2_line_request>` by gpio-v2-get-line-ioctl.rst. 27 28``config`` 29 The new :c:type:`configuration<gpio_v2_line_config>` to apply to the 30 requested lines. 31 32Description 33=========== 34 35Update the configuration of previously requested lines, without releasing the 36line or introducing potential glitches. 37 38The new configuration must specify the configuration of all requested lines. 39 40The same :ref:`gpio-v2-get-line-config-rules` and 41:ref:`gpio-v2-get-line-config-support` that apply when requesting the lines 42also apply when updating the line configuration. 43 44The motivating use case for this command is changing direction of 45bi-directional lines between input and output, but it may also be used to 46dynamically control edge detection, or more generally move lines seamlessly 47from one configuration state to another. 48 49To only change the value of output lines, use 50gpio-v2-line-set-values-ioctl.rst. 51 52Return Value 53============ 54 55On success 0. 56 57On error -1 and the ``errno`` variable is set appropriately. 58Common error codes are described in error-codes.rst. 59