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_validate_irq_flag(struct adis * adis)29 static 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 */
devm_adis_probe_trigger(struct adis * adis,struct iio_dev * indio_dev)63 int 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(adis->trig, adis);
75
76 ret = adis_validate_irq_flag(adis);
77 if (ret)
78 return ret;
79
80 ret = devm_request_irq(&adis->spi->dev, adis->spi->irq,
81 &iio_trigger_generic_data_rdy_poll,
82 adis->irq_flag,
83 indio_dev->name,
84 adis->trig);
85 if (ret)
86 return ret;
87
88 return devm_iio_trigger_register(&adis->spi->dev, adis->trig);
89 }
90 EXPORT_SYMBOL_NS_GPL(devm_adis_probe_trigger, IIO_ADISLIB);
91
92
