adis_trigger.c revision ec04cb048d79cd778c06e28f34395a46d774800d 
1/*
2 * Common library for ADIS16XXX devices
3 *
4 * Copyright 2012 Analog Devices Inc.
5 *   Author: Lars-Peter Clausen <lars@metafoo.de>
6 *
7 * Licensed under the GPL-2 or later.
8 */
9
10#include <linux/interrupt.h>
11#include <linux/kernel.h>
12#include <linux/spi/spi.h>
13#include <linux/export.h>
14
15#include <linux/iio/iio.h>
16#include <linux/iio/trigger.h>
17#include <linux/iio/imu/adis.h>
18
19static int adis_data_rdy_trigger_set_state(struct iio_trigger *trig,
20						bool state)
21{
22	struct adis *adis = trig->private_data;
23
24	return adis_enable_irq(adis, state);
25}
26
27static const struct iio_trigger_ops adis_trigger_ops = {
28	.owner = THIS_MODULE,
29	.set_trigger_state = &adis_data_rdy_trigger_set_state,
30};
31
32/**
33 * adis_probe_trigger() - Sets up trigger for a adis device
34 * @adis: The adis device
35 * @indio_dev: The IIO device
36 *
37 * Returns 0 on success or a negative error code
38 *
39 * adis_remove_trigger() should be used to free the trigger.
40 */
41int adis_probe_trigger(struct adis *adis, struct iio_dev *indio_dev)
42{
43	int ret;
44
45	adis->trig = iio_trigger_alloc("%s-dev%d", indio_dev->name,
46					indio_dev->id);
47	if (adis->trig == NULL)
48		return -ENOMEM;
49
50	ret = request_irq(adis->spi->irq,
51			  &iio_trigger_generic_data_rdy_poll,
52			  IRQF_TRIGGER_RISING,
53			  indio_dev->name,
54			  adis->trig);
55	if (ret)
56		goto error_free_trig;
57
58	adis->trig->dev.parent = &adis->spi->dev;
59	adis->trig->ops = &adis_trigger_ops;
60	adis->trig->private_data = adis;
61	ret = iio_trigger_register(adis->trig);
62
63	indio_dev->trig = adis->trig;
64	if (ret)
65		goto error_free_irq;
66
67	return 0;
68
69error_free_irq:
70	free_irq(adis->spi->irq, adis->trig);
71error_free_trig:
72	iio_trigger_free(adis->trig);
73	return ret;
74}
75EXPORT_SYMBOL_GPL(adis_probe_trigger);
76
77/**
78 * adis_remove_trigger() - Remove trigger for a adis devices
79 * @adis: The adis device
80 *
81 * Removes the trigger previously registered with adis_probe_trigger().
82 */
83void adis_remove_trigger(struct adis *adis)
84{
85	iio_trigger_unregister(adis->trig);
86	free_irq(adis->spi->irq, adis->trig);
87	iio_trigger_free(adis->trig);
88}
89EXPORT_SYMBOL_GPL(adis_remove_trigger);
90