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735ad074ff
Support triggered events. This is useful for chips that don't have their own interrupt sources. It allows to use generic/standalone iio triggers for those drivers. Signed-off-by: Vladimir Barinov <vladimir.barinov@cogentembedded.com> Signed-off-by: Jonathan Cameron <jic23@kernel.org>
68 lines
2.3 KiB
C
68 lines
2.3 KiB
C
/*
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* Copyright (C) 2015 Cogent Embedded, Inc.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*/
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#include <linux/kernel.h>
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#include <linux/export.h>
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#include <linux/module.h>
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#include <linux/iio/iio.h>
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#include <linux/iio/triggered_event.h>
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#include <linux/iio/trigger_consumer.h>
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/**
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* iio_triggered_event_setup() - Setup pollfunc_event for triggered event
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* @indio_dev: IIO device structure
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* @h: Function which will be used as pollfunc_event top half
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* @thread: Function which will be used as pollfunc_event bottom half
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*
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* This function combines some common tasks which will normally be performed
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* when setting up a triggered event. It will allocate the pollfunc_event and
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* set mode to use it for triggered event.
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*
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* Before calling this function the indio_dev structure should already be
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* completely initialized, but not yet registered. In practice this means that
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* this function should be called right before iio_device_register().
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*
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* To free the resources allocated by this function call
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* iio_triggered_event_cleanup().
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*/
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int iio_triggered_event_setup(struct iio_dev *indio_dev,
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irqreturn_t (*h)(int irq, void *p),
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irqreturn_t (*thread)(int irq, void *p))
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{
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indio_dev->pollfunc_event = iio_alloc_pollfunc(h,
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thread,
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IRQF_ONESHOT,
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indio_dev,
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"%s_consumer%d",
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indio_dev->name,
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indio_dev->id);
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if (indio_dev->pollfunc_event == NULL)
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return -ENOMEM;
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/* Flag that events polling is possible */
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indio_dev->modes |= INDIO_EVENT_TRIGGERED;
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return 0;
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}
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EXPORT_SYMBOL(iio_triggered_event_setup);
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/**
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* iio_triggered_event_cleanup() - Free resources allocated by iio_triggered_event_setup()
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* @indio_dev: IIO device structure
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*/
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void iio_triggered_event_cleanup(struct iio_dev *indio_dev)
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{
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indio_dev->modes &= ~INDIO_EVENT_TRIGGERED;
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iio_dealloc_pollfunc(indio_dev->pollfunc_event);
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}
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EXPORT_SYMBOL(iio_triggered_event_cleanup);
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MODULE_AUTHOR("Vladimir Barinov");
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MODULE_DESCRIPTION("IIO helper functions for setting up triggered events");
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MODULE_LICENSE("GPL");
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