Interrupt management services

Collaboration diagram for Interrupt management services:

Functions
unsigned int	a4l_get_irq (a4l_dev_t *dev)
	Get the interrupt number in use for a specific device. More...
int	a4l_request_irq (a4l_dev_t *dev, unsigned int irq, a4l_irq_hdlr_t handler, unsigned long flags, void *cookie)
	Register an interrupt handler for a specific device. More...
int	a4l_free_irq (a4l_dev_t *dev, unsigned int irq)
	Release an interrupt handler for a specific device. More...

Detailed Description

Function Documentation

int a4l_free_irq	(	a4l_dev_t *	dev,
		unsigned int	irq
	)

Release an interrupt handler for a specific device.

Parameters

[in]	dev	Device descriptor structure
[in]	irq	Line number of the addressed IRQ

Returns

0 on success, otherwise negative error code.

unsigned int a4l_get_irq

(

a4l_dev_t *

dev

)

Get the interrupt number in use for a specific device.

Parameters

[in]

dev

Device descriptor structure

Returns

the line number used or A4L_IRQ_UNUSED if no interrupt is registered.

int a4l_request_irq	(	a4l_dev_t *	dev,
		unsigned int	irq,
		a4l_irq_hdlr_t	handler,
		unsigned long	flags,
		void *	cookie
	)

Register an interrupt handler for a specific device.

Parameters

[in]	dev	Device descriptor structure
[in]	irq	Line number of the addressed IRQ
[in]	handler	Interrupt handler
[in]	flags	Registration flags: A4L_IRQ_SHARED: enable IRQ-sharing with other drivers (Warning: real-time drivers and non-real-time drivers cannot share an interrupt line). A4L_IRQ_EDGE: mark IRQ as edge-triggered (Warning: this flag is meaningless in RTDM-less context). A4L_IRQ_DISABLED: keep IRQ disabled when calling the action handler (Warning: this flag is ignored in RTDM-enabled configuration).
[in]	cookie	Pointer to be passed to the interrupt handler on invocation

Returns

0 on success, otherwise negative error code.