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
adis_data_rdy_trigger_set_state(struct iio_trigger * trig,bool state)18 static 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
25 static const struct iio_trigger_ops adis_trigger_ops = {
26 .set_trigger_state = &adis_data_rdy_trigger_set_state,
27 };
28
adis_trigger_setup(struct adis * adis)29 static 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
adis_validate_irq_flag(struct adis * adis)36 static 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 */
devm_adis_probe_trigger(struct adis * adis,struct iio_dev * indio_dev)70 int 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 }
95 EXPORT_SYMBOL_NS_GPL(devm_adis_probe_trigger, IIO_ADISLIB);
96
97