Module v2

Expand description

This module implements GPIO ABI v2 which is the current version of the ABI, released in Linux v5.10.

Structs§

ChipInfo: Information about a particular GPIO chip.
Errno: An error number returned by a kernel ioctl call.
LineAttribute: A configurable attribute of a line.
LineAttributes: The set of potential configuration attributes for a line.
LineConfig: Configuration for a set of requested lines.
LineConfigAttribute: A configuration attribute associated with one or more of the requested lines.
LineConfigAttributes: The set of additional configuration attributes for a line request.
LineEdgeEvent: Information about an edge event on a requested line.
LineFlags: Flags indicating the configuration of a line.
LineInfo: Information about a certain GPIO line.
LineInfoChangeEvent: An event indicating a change to the info for a line.
LineRequest: Information about a request for GPIO lines.
LineValues: Values of GPIO lines.
Name: A uAPI name string, common to ABI v1 and v2.
Offsets: A collection of line offsets.
UnderReadError: A failure to read sufficient bytes to construct an object.
ValidationError: A failure to validate a struct returned from a system call.

Error: Errors returned by gpiocdev_uapi functions.
LineAttributeKind: An identifier for which field of the LineAttributeValueUnion is in use.
LineAttributeValue: The attribute value contained within a LineAttribute.
LineEdgeEventKind: The trigger identifier for a LineEdgeEvent.
LineInfoChangeKind: The trigger identifier for a LineInfoChangeEvent.

NAME_LEN_MAX: The maximum number of bytes stored in a Name.
NUM_ATTRS_MAX: The capacity of LineAttributes and LineConfigAttributes arrays.
NUM_LINES_MAX: The maximum number of lines that may be requested in a single request.

get_chip_info: Get the publicly available information for a chip.
get_line: Request a line or set of lines for exclusive access.
get_line_info: Get the publicly available information for a line.
get_line_values: Read values of requested lines.
has_event: Check if the file has an event available to read.
read_event: Read an event from a chip or request file descriptor.
set_line_config: Update the configuration of an existing line request.
set_line_values: Set values of requested output lines.
unwatch_line_info: Remove any watch on changes to the LineInfo for a line.
wait_event: Wait for the file to have an event available to read.
watch_line_info: Add a watch on changes to the LineInfo for a line.