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: Vladimir Barinov <vladimir.barinov@cogentembedded.com> Signed-off-by: Jonathan Cameron <jic23@kernel.org>
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@ -38,6 +38,12 @@ config IIO_CONSUMERS_PER_TRIGGER
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This value controls the maximum number of consumers that a
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given trigger may handle. Default is 2.
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config IIO_TRIGGERED_EVENT
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tristate
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select IIO_TRIGGER
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help
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Provides helper functions for setting up triggered events.
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source "drivers/iio/accel/Kconfig"
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source "drivers/iio/adc/Kconfig"
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source "drivers/iio/amplifiers/Kconfig"
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@ -7,6 +7,8 @@ industrialio-y := industrialio-core.o industrialio-event.o inkern.o
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industrialio-$(CONFIG_IIO_BUFFER) += industrialio-buffer.o
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industrialio-$(CONFIG_IIO_TRIGGER) += industrialio-trigger.o
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obj-$(CONFIG_IIO_TRIGGERED_EVENT) += industrialio-triggered-event.o
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obj-y += accel/
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obj-y += adc/
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obj-y += amplifiers/
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@ -962,7 +962,7 @@ static void iio_device_unregister_sysfs(struct iio_dev *indio_dev)
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static void iio_dev_release(struct device *device)
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{
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struct iio_dev *indio_dev = dev_to_iio_dev(device);
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if (indio_dev->modes & INDIO_BUFFER_TRIGGERED)
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if (indio_dev->modes & (INDIO_BUFFER_TRIGGERED | INDIO_EVENT_TRIGGERED))
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iio_device_unregister_trigger_consumer(indio_dev);
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iio_device_unregister_eventset(indio_dev);
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iio_device_unregister_sysfs(indio_dev);
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@ -1243,7 +1243,7 @@ int iio_device_register(struct iio_dev *indio_dev)
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"Failed to register event set\n");
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goto error_free_sysfs;
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}
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if (indio_dev->modes & INDIO_BUFFER_TRIGGERED)
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if (indio_dev->modes & (INDIO_BUFFER_TRIGGERED | INDIO_EVENT_TRIGGERED))
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iio_device_register_trigger_consumer(indio_dev);
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if ((indio_dev->modes & INDIO_ALL_BUFFER_MODES) &&
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@ -366,10 +366,18 @@ static ssize_t iio_trigger_write_current(struct device *dev,
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indio_dev->trig = trig;
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if (oldtrig)
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if (oldtrig) {
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if (indio_dev->modes & INDIO_EVENT_TRIGGERED)
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iio_trigger_detach_poll_func(oldtrig,
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indio_dev->pollfunc_event);
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iio_trigger_put(oldtrig);
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if (indio_dev->trig)
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}
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if (indio_dev->trig) {
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iio_trigger_get(indio_dev->trig);
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if (indio_dev->modes & INDIO_EVENT_TRIGGERED)
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iio_trigger_attach_poll_func(indio_dev->trig,
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indio_dev->pollfunc_event);
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}
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return len;
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}
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68
drivers/iio/industrialio-triggered-event.c
Normal file
68
drivers/iio/industrialio-triggered-event.c
Normal file
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@ -0,0 +1,68 @@
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/*
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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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@ -294,6 +294,7 @@ static inline s64 iio_get_time_ns(void)
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#define INDIO_BUFFER_TRIGGERED 0x02
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#define INDIO_BUFFER_SOFTWARE 0x04
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#define INDIO_BUFFER_HARDWARE 0x08
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#define INDIO_EVENT_TRIGGERED 0x10
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#define INDIO_ALL_BUFFER_MODES \
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(INDIO_BUFFER_TRIGGERED | INDIO_BUFFER_HARDWARE | INDIO_BUFFER_SOFTWARE)
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@ -457,6 +458,7 @@ struct iio_buffer_setup_ops {
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* @scan_index_timestamp:[INTERN] cache of the index to the timestamp
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* @trig: [INTERN] current device trigger (buffer modes)
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* @pollfunc: [DRIVER] function run on trigger being received
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* @pollfunc_event: [DRIVER] function run on events trigger being received
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* @channels: [DRIVER] channel specification structure table
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* @num_channels: [DRIVER] number of channels specified in @channels.
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* @channel_attr_list: [INTERN] keep track of automatically created channel
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@ -495,6 +497,7 @@ struct iio_dev {
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unsigned scan_index_timestamp;
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struct iio_trigger *trig;
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struct iio_poll_func *pollfunc;
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struct iio_poll_func *pollfunc_event;
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struct iio_chan_spec const *channels;
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int num_channels;
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11
include/linux/iio/triggered_event.h
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11
include/linux/iio/triggered_event.h
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@ -0,0 +1,11 @@
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#ifndef _LINUX_IIO_TRIGGERED_EVENT_H_
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#define _LINUX_IIO_TRIGGERED_EVENT_H_
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#include <linux/interrupt.h>
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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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void iio_triggered_event_cleanup(struct iio_dev *indio_dev);
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#endif
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