1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0-or-later
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * Common library for ADIS16XXX devices
4*4882a593Smuzhiyun *
5*4882a593Smuzhiyun * Copyright 2012 Analog Devices Inc.
6*4882a593Smuzhiyun * Author: Lars-Peter Clausen <lars@metafoo.de>
7*4882a593Smuzhiyun */
8*4882a593Smuzhiyun
9*4882a593Smuzhiyun #include <linux/interrupt.h>
10*4882a593Smuzhiyun #include <linux/kernel.h>
11*4882a593Smuzhiyun #include <linux/spi/spi.h>
12*4882a593Smuzhiyun #include <linux/export.h>
13*4882a593Smuzhiyun
14*4882a593Smuzhiyun #include <linux/iio/iio.h>
15*4882a593Smuzhiyun #include <linux/iio/trigger.h>
16*4882a593Smuzhiyun #include <linux/iio/imu/adis.h>
17*4882a593Smuzhiyun
adis_data_rdy_trigger_set_state(struct iio_trigger * trig,bool state)18*4882a593Smuzhiyun static int adis_data_rdy_trigger_set_state(struct iio_trigger *trig,
19*4882a593Smuzhiyun bool state)
20*4882a593Smuzhiyun {
21*4882a593Smuzhiyun struct adis *adis = iio_trigger_get_drvdata(trig);
22*4882a593Smuzhiyun
23*4882a593Smuzhiyun return adis_enable_irq(adis, state);
24*4882a593Smuzhiyun }
25*4882a593Smuzhiyun
26*4882a593Smuzhiyun static const struct iio_trigger_ops adis_trigger_ops = {
27*4882a593Smuzhiyun .set_trigger_state = &adis_data_rdy_trigger_set_state,
28*4882a593Smuzhiyun };
29*4882a593Smuzhiyun
adis_trigger_setup(struct adis * adis)30*4882a593Smuzhiyun static void adis_trigger_setup(struct adis *adis)
31*4882a593Smuzhiyun {
32*4882a593Smuzhiyun adis->trig->dev.parent = &adis->spi->dev;
33*4882a593Smuzhiyun adis->trig->ops = &adis_trigger_ops;
34*4882a593Smuzhiyun iio_trigger_set_drvdata(adis->trig, adis);
35*4882a593Smuzhiyun }
36*4882a593Smuzhiyun
adis_validate_irq_flag(struct adis * adis)37*4882a593Smuzhiyun static int adis_validate_irq_flag(struct adis *adis)
38*4882a593Smuzhiyun {
39*4882a593Smuzhiyun /*
40*4882a593Smuzhiyun * Typically this devices have data ready either on the rising edge or
41*4882a593Smuzhiyun * on the falling edge of the data ready pin. This checks enforces that
42*4882a593Smuzhiyun * one of those is set in the drivers... It defaults to
43*4882a593Smuzhiyun * IRQF_TRIGGER_RISING for backward compatibility wiht devices that
44*4882a593Smuzhiyun * don't support changing the pin polarity.
45*4882a593Smuzhiyun */
46*4882a593Smuzhiyun if (!adis->irq_flag) {
47*4882a593Smuzhiyun adis->irq_flag = IRQF_TRIGGER_RISING;
48*4882a593Smuzhiyun return 0;
49*4882a593Smuzhiyun } else if (adis->irq_flag != IRQF_TRIGGER_RISING &&
50*4882a593Smuzhiyun adis->irq_flag != IRQF_TRIGGER_FALLING) {
51*4882a593Smuzhiyun dev_err(&adis->spi->dev, "Invalid IRQ mask: %08lx\n",
52*4882a593Smuzhiyun adis->irq_flag);
53*4882a593Smuzhiyun return -EINVAL;
54*4882a593Smuzhiyun }
55*4882a593Smuzhiyun
56*4882a593Smuzhiyun return 0;
57*4882a593Smuzhiyun }
58*4882a593Smuzhiyun
59*4882a593Smuzhiyun /**
60*4882a593Smuzhiyun * devm_adis_probe_trigger() - Sets up trigger for a managed adis device
61*4882a593Smuzhiyun * @adis: The adis device
62*4882a593Smuzhiyun * @indio_dev: The IIO device
63*4882a593Smuzhiyun *
64*4882a593Smuzhiyun * Returns 0 on success or a negative error code
65*4882a593Smuzhiyun */
devm_adis_probe_trigger(struct adis * adis,struct iio_dev * indio_dev)66*4882a593Smuzhiyun int devm_adis_probe_trigger(struct adis *adis, struct iio_dev *indio_dev)
67*4882a593Smuzhiyun {
68*4882a593Smuzhiyun int ret;
69*4882a593Smuzhiyun
70*4882a593Smuzhiyun adis->trig = devm_iio_trigger_alloc(&adis->spi->dev, "%s-dev%d",
71*4882a593Smuzhiyun indio_dev->name, indio_dev->id);
72*4882a593Smuzhiyun if (!adis->trig)
73*4882a593Smuzhiyun return -ENOMEM;
74*4882a593Smuzhiyun
75*4882a593Smuzhiyun adis_trigger_setup(adis);
76*4882a593Smuzhiyun
77*4882a593Smuzhiyun ret = adis_validate_irq_flag(adis);
78*4882a593Smuzhiyun if (ret)
79*4882a593Smuzhiyun return ret;
80*4882a593Smuzhiyun
81*4882a593Smuzhiyun ret = devm_request_irq(&adis->spi->dev, adis->spi->irq,
82*4882a593Smuzhiyun &iio_trigger_generic_data_rdy_poll,
83*4882a593Smuzhiyun adis->irq_flag,
84*4882a593Smuzhiyun indio_dev->name,
85*4882a593Smuzhiyun adis->trig);
86*4882a593Smuzhiyun if (ret)
87*4882a593Smuzhiyun return ret;
88*4882a593Smuzhiyun
89*4882a593Smuzhiyun return devm_iio_trigger_register(&adis->spi->dev, adis->trig);
90*4882a593Smuzhiyun }
91*4882a593Smuzhiyun EXPORT_SYMBOL_GPL(devm_adis_probe_trigger);
92*4882a593Smuzhiyun
93