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drivers/iio/industrialio-triggered-event.c
2.26 KB
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iio: Support trig...
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/*
* 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");
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