Functions allowing modification of config options of GPIO lines requested from user-space. More...

Collaboration diagram for Setting line configuration:

Functions
int	gpiod_line_set_config (struct gpiod_line *line, int direction, int flags, int value) GPIOD_API
	Update the configuration of a single GPIO line. More...

int	gpiod_line_set_config_bulk (struct gpiod_line_bulk bulk, int direction, int flags, const int values) GPIOD_API
	Update the configuration of a set of GPIO lines. More...

int	gpiod_line_set_flags (struct gpiod_line *line, int flags) GPIOD_API
	Update the configuration flags of a single GPIO line. More...

int	gpiod_line_set_flags_bulk (struct gpiod_line_bulk *bulk, int flags) GPIOD_API
	Update the configuration flags of a set of GPIO lines. More...

int	gpiod_line_set_direction_input (struct gpiod_line *line) GPIOD_API
	Set the direction of a single GPIO line to input. More...

int	gpiod_line_set_direction_input_bulk (struct gpiod_line_bulk *bulk) GPIOD_API
	Set the direction of a set of GPIO lines to input. More...

int	gpiod_line_set_direction_output (struct gpiod_line *line, int value) GPIOD_API
	Set the direction of a single GPIO line to output. More...

int	gpiod_line_set_direction_output_bulk (struct gpiod_line_bulk bulk, const int values) GPIOD_API
	Set the direction of a set of GPIO lines to output. More...

Detailed Description

Functions allowing modification of config options of GPIO lines requested from user-space.

Function Documentation

◆ gpiod_line_set_config()

int gpiod_line_set_config	(	struct gpiod_line *	line,
		int	direction,
		int	flags,
		int	value
	)

Update the configuration of a single GPIO line.

Parameters

line	GPIO line object.
direction	Updated direction which may be one of GPIOD_LINE_REQUEST_DIRECTION_AS_IS, GPIOD_LINE_REQUEST_DIRECTION_INPUT, or GPIOD_LINE_REQUEST_DIRECTION_OUTPUT.
flags	Replacement flags.
value	The new output value for the line when direction is GPIOD_LINE_REQUEST_DIRECTION_OUTPUT.

Returns: 0 is the operation succeeds. In case of an error this routine returns -1 and sets the last error number.

◆ gpiod_line_set_config_bulk()

int gpiod_line_set_config_bulk	(	struct gpiod_line_bulk *	bulk,
		int	direction,
		int	flags,
		const int *	values
	)

Update the configuration of a set of GPIO lines.

Parameters

bulk	Set of GPIO lines.
direction	Updated direction which may be one of GPIOD_LINE_REQUEST_DIRECTION_AS_IS, GPIOD_LINE_REQUEST_DIRECTION_INPUT, or GPIOD_LINE_REQUEST_DIRECTION_OUTPUT.
flags	Replacement flags.
values	An array holding line_bulk->num_lines new logical values for lines when direction is GPIOD_LINE_REQUEST_DIRECTION_OUTPUT. A NULL pointer is interpreted as a logical low for all lines.

Returns: 0 is the operation succeeds. In case of an error this routine returns -1 and sets the last error number.

If the lines were not previously requested together, the behavior is undefined.

◆ gpiod_line_set_direction_input()

int gpiod_line_set_direction_input ( struct gpiod_line * line )

Set the direction of a single GPIO line to input.

Parameters

line	GPIO line object.

Returns: 0 is the operation succeeds. In case of an error this routine returns -1 and sets the last error number.

◆ gpiod_line_set_direction_input_bulk()

int gpiod_line_set_direction_input_bulk ( struct gpiod_line_bulk * bulk )

Set the direction of a set of GPIO lines to input.

Parameters

bulk	Set of GPIO lines.

Returns: 0 is the operation succeeds. In case of an error this routine returns -1 and sets the last error number.

If the lines were not previously requested together, the behavior is undefined.

◆ gpiod_line_set_direction_output()

int gpiod_line_set_direction_output	(	struct gpiod_line *	line,
		int	value
	)

Set the direction of a single GPIO line to output.

Parameters

line	GPIO line object.
value	The logical value output on the line.

Returns: 0 is the operation succeeds. In case of an error this routine returns -1 and sets the last error number.

◆ gpiod_line_set_direction_output_bulk()

int gpiod_line_set_direction_output_bulk	(	struct gpiod_line_bulk *	bulk,
		const int *	values
	)

Set the direction of a set of GPIO lines to output.

Parameters

bulk	Set of GPIO lines.
values	An array holding line_bulk->num_lines new logical values for lines. A NULL pointer is interpreted as a logical low for all lines.

Returns: 0 is the operation succeeds. In case of an error this routine returns -1 and sets the last error number.

If the lines were not previously requested together, the behavior is undefined.

References GPIOD_LINE_EVENT_FALLING_EDGE, and GPIOD_LINE_EVENT_RISING_EDGE.

◆ gpiod_line_set_flags()

int gpiod_line_set_flags	(	struct gpiod_line *	line,
		int	flags
	)

Update the configuration flags of a single GPIO line.

Parameters

line	GPIO line object.
flags	Replacement flags.

Returns: 0 is the operation succeeds. In case of an error this routine returns -1 and sets the last error number.

◆ gpiod_line_set_flags_bulk()

int gpiod_line_set_flags_bulk	(	struct gpiod_line_bulk *	bulk,
		int	flags
	)

Update the configuration flags of a set of GPIO lines.

Parameters

bulk	Set of GPIO lines.
flags	Replacement flags.

Returns: 0 is the operation succeeds. In case of an error this routine returns -1 and sets the last error number.

If the lines were not previously requested together, the behavior is undefined.