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,
19 bool state)
20 {
21 struct adis *adis = iio_trigger_get_drvdata(trig);
22
23 return adis_enable_irq(adis, state);
24 }
25
26 static const struct iio_trigger_ops adis_trigger_ops = {
27 .set_trigger_state = &adis_data_rdy_trigger_set_state,
28 };
29
adis_validate_irq_flag(struct adis * adis)30 static int adis_validate_irq_flag(struct adis *adis)
31 {
32 unsigned long direction = adis->irq_flag & IRQF_TRIGGER_MASK;
33
34 /* We cannot mask the interrupt so ensure it's not enabled at request */
35 if (adis->data->unmasked_drdy)
36 adis->irq_flag |= IRQF_NO_AUTOEN;
37 /*
38 * Typically this devices have data ready either on the rising edge or
39 * on the falling edge of the data ready pin. This checks enforces that
40 * one of those is set in the drivers... It defaults to
41 * IRQF_TRIGGER_RISING for backward compatibility with devices that
42 * don't support changing the pin polarity.
43 */
44 if (direction == IRQF_TRIGGER_NONE) {
45 adis->irq_flag |= IRQF_TRIGGER_RISING;
46 return 0;
47 } else if (direction != IRQF_TRIGGER_RISING &&
48 direction != IRQF_TRIGGER_FALLING) {
49 dev_err(&adis->spi->dev, "Invalid IRQ mask: %08lx\n",
50 adis->irq_flag);
51 return -EINVAL;
52 }
53
54 return 0;
55 }
56
57 /**
58 * devm_adis_probe_trigger() - Sets up trigger for a managed adis device
59 * @adis: The adis device
60 * @indio_dev: The IIO device
61 *
62 * Returns 0 on success or a negative error code
63 */
devm_adis_probe_trigger(struct adis * adis,struct iio_dev * indio_dev)64 int devm_adis_probe_trigger(struct adis *adis, struct iio_dev *indio_dev)
65 {
66 int ret;
67
68 adis->trig = devm_iio_trigger_alloc(&adis->spi->dev, "%s-dev%d",
69 indio_dev->name,
70 iio_device_id(indio_dev));
71 if (!adis->trig)
72 return -ENOMEM;
73
74 adis->trig->ops = &adis_trigger_ops;
75 iio_trigger_set_drvdata(adis->trig, adis);
76
77 ret = adis_validate_irq_flag(adis);
78 if (ret)
79 return ret;
80
81 ret = devm_request_irq(&adis->spi->dev, adis->spi->irq,
82 &iio_trigger_generic_data_rdy_poll,
83 adis->irq_flag,
84 indio_dev->name,
85 adis->trig);
86 if (ret)
87 return ret;
88
89 return devm_iio_trigger_register(&adis->spi->dev, adis->trig);
90 }
91 EXPORT_SYMBOL_GPL(devm_adis_probe_trigger);
92
93