1 .. SPDX-License-Identifier: GPL-2.0 2 3 .. _GPIO_GET_LINEINFO_IOCTL: 4 5 *********************** 6 GPIO_GET_LINEINFO_IOCTL 7 *********************** 8 9 .. warning:: 10 This ioctl is part of chardev_v1.rst and is obsoleted by 11 gpio-v2-get-lineinfo-ioctl.rst. 12 13 Name 14 ==== 15 16 GPIO_GET_LINEINFO_IOCTL - Get the publicly available information for a line. 17 18 Synopsis 19 ======== 20 21 .. c:macro:: GPIO_GET_LINEINFO_IOCTL 22 23 ``int ioctl(int chip_fd, GPIO_GET_LINEINFO_IOCTL, struct gpioline_info *info)`` 24 25 Arguments 26 ========= 27 28 ``chip_fd`` 29 The file descriptor of the GPIO character device returned by `open()`. 30 31 ``info`` 32 The :c:type:`line_info<gpioline_info>` to be populated, with the 33 ``offset`` field set to indicate the line to be collected. 34 35 Description 36 =========== 37 38 Get the publicly available information for a line. 39 40 This information is available independent of whether the line is in use. 41 42 .. note:: 43 The line info does not include the line value. 44 45 The line must be requested using gpio-get-linehandle-ioctl.rst or 46 gpio-get-lineevent-ioctl.rst to access its value. 47 48 Return Value 49 ============ 50 51 On success 0 and ``info`` is populated with the chip info. 52 53 On error -1 and the ``errno`` variable is set appropriately. 54 Common error codes are described in error-codes.rst.
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