1 .. SPDX-License-Identifier: GPL-2.0 2 3 .. _GPIO_V2_GET_LINEINFO_IOCTL: 4 5 ************************** 6 GPIO_V2_GET_LINEINFO_IOCTL 7 ************************** 8 9 Name 10 ==== 11 12 GPIO_V2_GET_LINEINFO_IOCTL - Get the publicly available information for a line. 13 14 Synopsis 15 ======== 16 17 .. c:macro:: GPIO_V2_GET_LINEINFO_IOCTL 18 19 ``int ioctl(int chip_fd, GPIO_V2_GET_LINEINFO_IOCTL, struct gpio_v2_line_info *info)`` 20 21 Arguments 22 ========= 23 24 ``chip_fd`` 25 The file descriptor of the GPIO character device returned by `open()`. 26 27 ``info`` 28 The :c:type:`line_info<gpio_v2_line_info>` to be populated, with the 29 ``offset`` field set to indicate the line to be collected. 30 31 Description 32 =========== 33 34 Get the publicly available information for a line. 35 36 This information is available independent of whether the line is in use. 37 38 .. note:: 39 The line info does not include the line value. 40 41 The line must be requested using gpio-v2-get-line-ioctl.rst to access its 42 value. 43 44 Return Value 45 ============ 46 47 On success 0 and ``info`` is populated with the chip info. 48 49 On error -1 and the ``errno`` variable is set appropriately. 50 Common error codes are described in error-codes.rst.
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