xref: /openbmc/linux/drivers/iio/imu/adis_trigger.c (revision 0c6dfa75)
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 
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 
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  */
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