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Commit 735ad074 authored by Vladimir Barinov's avatar Vladimir Barinov Committed by Jonathan Cameron
Browse files

iio: Support triggered events 



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: default avatarVladimir Barinov <vladimir.barinov@cogentembedded.com>
Signed-off-by: default avatarJonathan Cameron <jic23@kernel.org>
parent 764589b6

drivers/iio/Kconfig

+6 −0
Original line number Diff line number Diff line
@@ -38,6 +38,12 @@ config IIO_CONSUMERS_PER_TRIGGER 
	This value controls the maximum number of consumers that a

	given trigger may handle. Default is 2.



config IIO_TRIGGERED_EVENT

	tristate

	select IIO_TRIGGER

	help

	  Provides helper functions for setting up triggered events.



source "drivers/iio/accel/Kconfig"

source "drivers/iio/adc/Kconfig"

source "drivers/iio/amplifiers/Kconfig"

drivers/iio/Makefile

+2 −0
Original line number Diff line number Diff line
@@ -7,6 +7,8 @@ industrialio-y := industrialio-core.o industrialio-event.o inkern.o 
industrialio-$(CONFIG_IIO_BUFFER) += industrialio-buffer.o

industrialio-$(CONFIG_IIO_TRIGGER) += industrialio-trigger.o



obj-$(CONFIG_IIO_TRIGGERED_EVENT) += industrialio-triggered-event.o



obj-y += accel/

obj-y += adc/

obj-y += amplifiers/

drivers/iio/industrialio-core.c

+2 −2
Original line number Diff line number Diff line
@@ -962,7 +962,7 @@ static void iio_device_unregister_sysfs(struct iio_dev *indio_dev) 
static void iio_dev_release(struct device *device)

{

	struct iio_dev *indio_dev = dev_to_iio_dev(device);

	if (indio_dev->modes & INDIO_BUFFER_TRIGGERED)

	if (indio_dev->modes & (INDIO_BUFFER_TRIGGERED | INDIO_EVENT_TRIGGERED))

		iio_device_unregister_trigger_consumer(indio_dev);

	iio_device_unregister_eventset(indio_dev);

	iio_device_unregister_sysfs(indio_dev);
@@ -1243,7 +1243,7 @@ int iio_device_register(struct iio_dev *indio_dev) 
			"Failed to register event set\n");

		goto error_free_sysfs;

	}

	if (indio_dev->modes & INDIO_BUFFER_TRIGGERED)

	if (indio_dev->modes & (INDIO_BUFFER_TRIGGERED | INDIO_EVENT_TRIGGERED))

		iio_device_register_trigger_consumer(indio_dev);



	if ((indio_dev->modes & INDIO_ALL_BUFFER_MODES) &&

drivers/iio/industrialio-trigger.c

+10 −2
Original line number Diff line number Diff line
@@ -366,10 +366,18 @@ static ssize_t iio_trigger_write_current(struct device *dev, 


	indio_dev->trig = trig;



	if (oldtrig)

	if (oldtrig) {

		if (indio_dev->modes & INDIO_EVENT_TRIGGERED)

			iio_trigger_detach_poll_func(oldtrig,

						     indio_dev->pollfunc_event);

		iio_trigger_put(oldtrig);

	if (indio_dev->trig)

	}

	if (indio_dev->trig) {

		iio_trigger_get(indio_dev->trig);

		if (indio_dev->modes & INDIO_EVENT_TRIGGERED)

			iio_trigger_attach_poll_func(indio_dev->trig,

						     indio_dev->pollfunc_event);

	}



	return len;

}

drivers/iio/industrialio-triggered-event.c

0 → 100644
+68 −0
Original line number Diff line number Diff line 
/*

 * 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");