1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Common library for ADIS16XXX devices
4 *
5 * Copyright 2012 Analog Devices Inc.
6 *   Author: Lars-Peter Clausen <lars@metafoo.de>
7 */
8
9#include <linux/interrupt.h>
10#include <linux/kernel.h>
11#include <linux/spi/spi.h>
12#include <linux/export.h>
13
14#include <linux/iio/iio.h>
15#include <linux/iio/trigger.h>
16#include <linux/iio/imu/adis.h>
17
18static int adis_data_rdy_trigger_set_state(struct iio_trigger *trig, bool state)
19{
20	struct adis *adis = iio_trigger_get_drvdata(trig);
21
22	return adis_enable_irq(adis, state);
23}
24
25static const struct iio_trigger_ops adis_trigger_ops = {
26	.set_trigger_state = &adis_data_rdy_trigger_set_state,
27};
28
29static void adis_trigger_setup(struct adis *adis)
30{
31	adis->trig->dev.parent = &adis->spi->dev;
32	adis->trig->ops = &adis_trigger_ops;
33	iio_trigger_set_drvdata(adis->trig, adis);
34}
35
36static int adis_validate_irq_flag(struct adis *adis)
37{
38	unsigned long direction = adis->irq_flag & IRQF_TRIGGER_MASK;
39
40	/* We cannot mask the interrupt so ensure it's not enabled at request */
41	if (adis->data->unmasked_drdy)
42		adis->irq_flag |= IRQF_NO_AUTOEN;
43	/*
44	 * Typically this devices have data ready either on the rising edge or
45	 * on the falling edge of the data ready pin. This checks enforces that
46	 * one of those is set in the drivers... It defaults to
47	 * IRQF_TRIGGER_RISING for backward compatibility with devices that
48	 * don't support changing the pin polarity.
49	 */
50	if (direction == IRQF_TRIGGER_NONE) {
51		adis->irq_flag |= IRQF_TRIGGER_RISING;
52		return 0;
53	} else if (direction != IRQF_TRIGGER_RISING &&
54		   direction != IRQF_TRIGGER_FALLING) {
55		dev_err(&adis->spi->dev, "Invalid IRQ mask: %08lx\n",
56			adis->irq_flag);
57		return -EINVAL;
58	}
59
60	return 0;
61}
62
63/**
64 * devm_adis_probe_trigger() - Sets up trigger for a managed adis device
65 * @adis: The adis device
66 * @indio_dev: The IIO device
67 *
68 * Returns 0 on success or a negative error code
69 */
70int devm_adis_probe_trigger(struct adis *adis, struct iio_dev *indio_dev)
71{
72	int ret;
73
74	adis->trig = devm_iio_trigger_alloc(&adis->spi->dev, "%s-dev%d",
75					    indio_dev->name, indio_dev->id);
76	if (!adis->trig)
77		return -ENOMEM;
78
79	adis_trigger_setup(adis);
80
81	ret = adis_validate_irq_flag(adis);
82	if (ret)
83		return ret;
84
85	ret = devm_request_irq(&adis->spi->dev, adis->spi->irq,
86			       &iio_trigger_generic_data_rdy_poll,
87			       adis->irq_flag,
88			       indio_dev->name,
89			       adis->trig);
90	if (ret)
91		return ret;
92
93	return devm_iio_trigger_register(&adis->spi->dev, adis->trig);
94}
95EXPORT_SYMBOL_NS_GPL(devm_adis_probe_trigger, IIO_ADISLIB);
96
97