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, enable: 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 int adis_validate_irq_flag(struct adis *adis)
30{
31 unsigned long direction = adis->irq_flag & IRQF_TRIGGER_MASK;
32
33 /* We cannot mask the interrupt so ensure it's not enabled at request */
34 if (adis->data->unmasked_drdy)
35 adis->irq_flag |= IRQF_NO_AUTOEN;
36 /*
37 * Typically this devices have data ready either on the rising edge or
38 * on the falling edge of the data ready pin. This checks enforces that
39 * one of those is set in the drivers... It defaults to
40 * IRQF_TRIGGER_RISING for backward compatibility with devices that
41 * don't support changing the pin polarity.
42 */
43 if (direction == IRQF_TRIGGER_NONE) {
44 adis->irq_flag |= IRQF_TRIGGER_RISING;
45 return 0;
46 } else if (direction != IRQF_TRIGGER_RISING &&
47 direction != IRQF_TRIGGER_FALLING) {
48 dev_err(&adis->spi->dev, "Invalid IRQ mask: %08lx\n",
49 adis->irq_flag);
50 return -EINVAL;
51 }
52
53 return 0;
54}
55
56/**
57 * devm_adis_probe_trigger() - Sets up trigger for a managed adis device
58 * @adis: The adis device
59 * @indio_dev: The IIO device
60 *
61 * Returns 0 on success or a negative error code
62 */
63int devm_adis_probe_trigger(struct adis *adis, struct iio_dev *indio_dev)
64{
65 int ret;
66
67 adis->trig = devm_iio_trigger_alloc(&adis->spi->dev, "%s-dev%d",
68 indio_dev->name,
69 iio_device_id(indio_dev));
70 if (!adis->trig)
71 return -ENOMEM;
72
73 adis->trig->ops = &adis_trigger_ops;
74 iio_trigger_set_drvdata(trig: adis->trig, data: adis);
75
76 ret = adis_validate_irq_flag(adis);
77 if (ret)
78 return ret;
79
80 ret = devm_request_irq(dev: &adis->spi->dev, irq: adis->spi->irq,
81 handler: &iio_trigger_generic_data_rdy_poll,
82 irqflags: adis->irq_flag,
83 devname: indio_dev->name,
84 dev_id: adis->trig);
85 if (ret)
86 return ret;
87
88 return devm_iio_trigger_register(dev: &adis->spi->dev, trig_info: adis->trig);
89}
90EXPORT_SYMBOL_NS_GPL(devm_adis_probe_trigger, IIO_ADISLIB);
91
92

source code of linux/drivers/iio/imu/adis_trigger.c