Interrupt Output

Interrupt output functions. More...

Data Structures
struct	mcp23016_interrupt
	Handle to a MCP23016 interrupt. More...

Functions
struct mcp23016_interrupt *	mcp23016_interrupt_open (const char *path, unsigned int offset)
	Open the MCP23016 interrupt specified by path and offset. More...
void	mcp23016_interrupt_close (struct mcp23016_interrupt *intr)
	Close a MCP23016 interrupt handle and free associated memory. More...
int	mcp23016_has_interrupt (struct mcp23016_interrupt *intr)
	Check interrupt output status. More...

Detailed Description

Interrupt output functions.

These functions manage the interrupt output functionality of the MCP23016, which can be shared by multiple devices. Use of these functions is considered optional and is only required if the caller wishes to be notified of input state changes.

Function Documentation

mcp23016_has_interrupt()

int mcp23016_has_interrupt

(

struct mcp23016_interrupt *

intr

)

Check interrupt output status.

Parameters

intr	Pointer to a MCP23016 interrupt handle.

Returns

Interrupt status (0 or 1) on success, or -1 on error with errno set appropriately.

mcp23016_interrupt_close()

void mcp23016_interrupt_close

(

struct mcp23016_interrupt *

intr

)

Close a MCP23016 interrupt handle and free associated memory.

Parameters

intr	Pointer to a MCP23016 interrupt handle.

Once closed, interrupt is no longer valid for use.

mcp23016_interrupt_open()

struct mcp23016_interrupt* mcp23016_interrupt_open	(	const char *	path,
		unsigned int	offset
	)

Open the MCP23016 interrupt specified by path and offset.

Parameters

path	Pointer to a GPIO character device.
offset	GPIO line offset.

Returns

Pointer to a MCP23016 interrupt handle, or NULL on error with errno set appropriately.