tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
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linux
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 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 adis devices without FIFO have data ready either on the
38 * rising edge or on the falling edge of the data ready pin.
39 * IMU devices with FIFO support have the watermark pin level driven
40 * either high or low when the FIFO is filled with the desired number
41 * of samples.
42 * It defaults to IRQF_TRIGGER_RISING for backward compatibility with
43 * devices that don't support changing the pin polarity.
44 */
45 if (direction == IRQF_TRIGGER_NONE) {
46 adis->irq_flag |= IRQF_TRIGGER_RISING;
47 return 0;
48 } else if (direction != IRQF_TRIGGER_RISING &&
49 direction != IRQF_TRIGGER_FALLING && !adis->data->has_fifo) {
50 dev_err(&adis->spi->dev, "Invalid IRQ mask: %08lx\n",
51 adis->irq_flag);
52 return -EINVAL;
53 } else if (direction != IRQF_TRIGGER_HIGH &&
54 direction != IRQF_TRIGGER_LOW && adis->data->has_fifo) {
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,
76 iio_device_id(indio_dev));
77 if (!adis->trig)
78 return -ENOMEM;
79
80 adis->trig->ops = &adis_trigger_ops;
81 iio_trigger_set_drvdata(adis->trig, adis);
82
83 ret = adis_validate_irq_flag(adis);
84 if (ret)
85 return ret;
86
87 if (adis->data->has_fifo)
88 ret = devm_request_threaded_irq(&adis->spi->dev, adis->spi->irq,
89 NULL,
90 &iio_trigger_generic_data_rdy_poll,
91 adis->irq_flag | IRQF_ONESHOT,
92 indio_dev->name,
93 adis->trig);
94 else
95 ret = devm_request_irq(&adis->spi->dev, adis->spi->irq,
96 &iio_trigger_generic_data_rdy_poll,
97 adis->irq_flag,
98 indio_dev->name,
99 adis->trig);
100 if (ret)
101 return ret;
102
103 return devm_iio_trigger_register(&adis->spi->dev, adis->trig);
104}
105EXPORT_SYMBOL_NS_GPL(devm_adis_probe_trigger, "IIO_ADISLIB");
106