linux/drivers/iio/dummy/iio_simple_dummy_buffer.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright (c) 2011 Jonathan Cameron
 *
 * Buffer handling elements of industrial I/O reference driver.
 * Uses the kfifo buffer.
 *
 * To test without hardware use the sysfs trigger.
 */

#include <linux/kernel.h>
#include <linux/export.h>
#include <linux/slab.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/bitmap.h>

#include <linux/iio/iio.h>
#include <linux/iio/buffer.h>
#include <linux/iio/trigger_consumer.h>
#include <linux/iio/triggered_buffer.h>

#include "iio_simple_dummy.h"

/* Some fake data */

static const s16 fakedata[] = …;

/**
 * iio_simple_dummy_trigger_h() - the trigger handler function
 * @irq: the interrupt number
 * @p: private data - always a pointer to the poll func.
 *
 * This is the guts of buffered capture. On a trigger event occurring,
 * if the pollfunc is attached then this handler is called as a threaded
 * interrupt (and hence may sleep). It is responsible for grabbing data
 * from the device and pushing it into the associated buffer.
 */
static irqreturn_t iio_simple_dummy_trigger_h(int irq, void *p)
{ … }

static const struct iio_buffer_setup_ops iio_simple_dummy_buffer_setup_ops = …;

int iio_simple_dummy_configure_buffer(struct iio_dev *indio_dev)
{ … }

/**
 * iio_simple_dummy_unconfigure_buffer() - release buffer resources
 * @indio_dev: device instance state
 */
void iio_simple_dummy_unconfigure_buffer(struct iio_dev *indio_dev)
{ … }