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Diffstat (limited to 'Documentation/userspace-api/gpio/gpio-get-lineinfo-unwatch-ioctl.rst')
-rw-r--r-- | Documentation/userspace-api/gpio/gpio-get-lineinfo-unwatch-ioctl.rst | 49 |
1 files changed, 49 insertions, 0 deletions
diff --git a/Documentation/userspace-api/gpio/gpio-get-lineinfo-unwatch-ioctl.rst b/Documentation/userspace-api/gpio/gpio-get-lineinfo-unwatch-ioctl.rst new file mode 100644 index 000000000000..a82d0161daf8 --- /dev/null +++ b/Documentation/userspace-api/gpio/gpio-get-lineinfo-unwatch-ioctl.rst @@ -0,0 +1,49 @@ +.. SPDX-License-Identifier: GPL-2.0 + +.. _GPIO_GET_LINEINFO_UNWATCH_IOCTL: + +******************************* +GPIO_GET_LINEINFO_UNWATCH_IOCTL +******************************* + +Name +==== + +GPIO_GET_LINEINFO_UNWATCH_IOCTL - Disable watching a line for changes to its +requested state and configuration information. + +Synopsis +======== + +.. c:macro:: GPIO_GET_LINEINFO_UNWATCH_IOCTL + +``int ioctl(int chip_fd, GPIO_GET_LINEINFO_UNWATCH_IOCTL, u32 *offset)`` + +Arguments +========= + +``chip_fd`` + The file descriptor of the GPIO character device returned by `open()`. + +``offset`` + The offset of the line to no longer watch. + +Description +=========== + +Remove the line from the list of lines being watched on this ``chip_fd``. + +This is the reverse of gpio-v2-get-lineinfo-watch-ioctl.rst (v2) and +gpio-get-lineinfo-watch-ioctl.rst (v1). + +Unwatching a line that is not watched is an error (**EBUSY**). + +First added in 5.7. + +Return Value +============ + +On success 0. + +On error -1 and the ``errno`` variable is set appropriately. +Common error codes are described in error-codes.rst. |