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1// SPDX-License-Identifier: GPL-2.0-or-later2/*3 * Copyright (C) 2015 Cogent Embedded, Inc.4 */5 6#include <linux/kernel.h>7#include <linux/export.h>8#include <linux/module.h>9#include <linux/iio/iio.h>10#include <linux/iio/triggered_event.h>11#include <linux/iio/trigger_consumer.h>12 13/**14 * iio_triggered_event_setup() - Setup pollfunc_event for triggered event15 * @indio_dev: IIO device structure16 * @h: Function which will be used as pollfunc_event top half17 * @thread: Function which will be used as pollfunc_event bottom half18 *19 * This function combines some common tasks which will normally be performed20 * when setting up a triggered event. It will allocate the pollfunc_event and21 * set mode to use it for triggered event.22 *23 * Before calling this function the indio_dev structure should already be24 * completely initialized, but not yet registered. In practice this means that25 * this function should be called right before iio_device_register().26 *27 * To free the resources allocated by this function call28 * iio_triggered_event_cleanup().29 */30int iio_triggered_event_setup(struct iio_dev *indio_dev,31 irqreturn_t (*h)(int irq, void *p),32 irqreturn_t (*thread)(int irq, void *p))33{34 indio_dev->pollfunc_event = iio_alloc_pollfunc(h,35 thread,36 IRQF_ONESHOT,37 indio_dev,38 "%s_consumer%d",39 indio_dev->name,40 iio_device_id(indio_dev));41 if (indio_dev->pollfunc_event == NULL)42 return -ENOMEM;43 44 /* Flag that events polling is possible */45 indio_dev->modes |= INDIO_EVENT_TRIGGERED;46 47 return 0;48}49EXPORT_SYMBOL(iio_triggered_event_setup);50 51/**52 * iio_triggered_event_cleanup() - Free resources allocated by iio_triggered_event_setup()53 * @indio_dev: IIO device structure54 */55void iio_triggered_event_cleanup(struct iio_dev *indio_dev)56{57 indio_dev->modes &= ~INDIO_EVENT_TRIGGERED;58 iio_dealloc_pollfunc(indio_dev->pollfunc_event);59}60EXPORT_SYMBOL(iio_triggered_event_cleanup);61 62MODULE_AUTHOR("Vladimir Barinov");63MODULE_DESCRIPTION("IIO helper functions for setting up triggered events");64MODULE_LICENSE("GPL");65