69 lines
2.3 KiB
C
69 lines
2.3 KiB
C
/*
|
|
* Copyright (C) 2015 Cogent Embedded, Inc.
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify it
|
|
* under the terms of the GNU General Public License as published by the
|
|
* Free Software Foundation; either version 2 of the License, or (at your
|
|
* option) any later version.
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/export.h>
|
|
#include <linux/module.h>
|
|
#include <linux/iio/iio.h>
|
|
#include <linux/iio/triggered_event.h>
|
|
#include <linux/iio/trigger_consumer.h>
|
|
|
|
/**
|
|
* iio_triggered_event_setup() - Setup pollfunc_event for triggered event
|
|
* @indio_dev: IIO device structure
|
|
* @h: Function which will be used as pollfunc_event top half
|
|
* @thread: Function which will be used as pollfunc_event bottom half
|
|
*
|
|
* This function combines some common tasks which will normally be performed
|
|
* when setting up a triggered event. It will allocate the pollfunc_event and
|
|
* set mode to use it for triggered event.
|
|
*
|
|
* Before calling this function the indio_dev structure should already be
|
|
* completely initialized, but not yet registered. In practice this means that
|
|
* this function should be called right before iio_device_register().
|
|
*
|
|
* To free the resources allocated by this function call
|
|
* iio_triggered_event_cleanup().
|
|
*/
|
|
int iio_triggered_event_setup(struct iio_dev *indio_dev,
|
|
irqreturn_t (*h)(int irq, void *p),
|
|
irqreturn_t (*thread)(int irq, void *p))
|
|
{
|
|
indio_dev->pollfunc_event = iio_alloc_pollfunc(h,
|
|
thread,
|
|
IRQF_ONESHOT,
|
|
indio_dev,
|
|
"%s_consumer%d",
|
|
indio_dev->name,
|
|
indio_dev->id);
|
|
if (indio_dev->pollfunc_event == NULL)
|
|
return -ENOMEM;
|
|
|
|
/* Flag that events polling is possible */
|
|
indio_dev->modes |= INDIO_EVENT_TRIGGERED;
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(iio_triggered_event_setup);
|
|
|
|
/**
|
|
* iio_triggered_event_cleanup() - Free resources allocated by iio_triggered_event_setup()
|
|
* @indio_dev: IIO device structure
|
|
*/
|
|
void iio_triggered_event_cleanup(struct iio_dev *indio_dev)
|
|
{
|
|
indio_dev->modes &= ~INDIO_EVENT_TRIGGERED;
|
|
iio_dealloc_pollfunc(indio_dev->pollfunc_event);
|
|
}
|
|
EXPORT_SYMBOL(iio_triggered_event_cleanup);
|
|
|
|
MODULE_AUTHOR("Vladimir Barinov");
|
|
MODULE_DESCRIPTION("IIO helper functions for setting up triggered events");
|
|
MODULE_LICENSE("GPL");
|