cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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industrialio-triggered-event.c (2108B)

      1// SPDX-License-Identifier: GPL-2.0-or-later
      2/*
      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 event
     15 * @indio_dev:	IIO device structure
     16 * @h:		Function which will be used as pollfunc_event top half
     17 * @thread:	Function which will be used as pollfunc_event bottom half
     18 *
     19 * This function combines some common tasks which will normally be performed
     20 * when setting up a triggered event. It will allocate the pollfunc_event and
     21 * set mode to use it for triggered event.
     22 *
     23 * Before calling this function the indio_dev structure should already be
     24 * completely initialized, but not yet registered. In practice this means that
     25 * this function should be called right before iio_device_register().
     26 *
     27 * To free the resources allocated by this function call
     28 * 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 structure
     54 */
     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");