1 /*
2 * Common library for ADIS16XXX devices
3 *
4 * Copyright 2012 Analog Devices Inc.
5 * Author: Lars-Peter Clausen <lars@metafoo.de>
6 *
7 * Licensed under the GPL-2 or later.
8 */
9
10 #include <linux/interrupt.h>
11 #include <linux/kernel.h>
12 #include <linux/spi/spi.h>
13 #include <linux/export.h>
14
15 #include <linux/iio/iio.h>
16 #include <linux/iio/trigger.h>
17 #include <linux/iio/imu/adis.h>
18
adis_data_rdy_trigger_set_state(struct iio_trigger * trig,bool state)19 static int adis_data_rdy_trigger_set_state(struct iio_trigger *trig,
20 bool state)
21 {
22 struct adis *adis = iio_trigger_get_drvdata(trig);
23
24 return adis_enable_irq(adis, state);
25 }
26
27 static const struct iio_trigger_ops adis_trigger_ops = {
28 .owner = THIS_MODULE,
29 .set_trigger_state = &adis_data_rdy_trigger_set_state,
30 };
31
32 /**
33 * adis_probe_trigger() - Sets up trigger for a adis device
34 * @adis: The adis device
35 * @indio_dev: The IIO device
36 *
37 * Returns 0 on success or a negative error code
38 *
39 * adis_remove_trigger() should be used to free the trigger.
40 */
adis_probe_trigger(struct adis * adis,struct iio_dev * indio_dev)41 int adis_probe_trigger(struct adis *adis, struct iio_dev *indio_dev)
42 {
43 int ret;
44
45 adis->trig = iio_trigger_alloc("%s-dev%d", indio_dev->name,
46 indio_dev->id);
47 if (adis->trig == NULL)
48 return -ENOMEM;
49
50 ret = request_irq(adis->spi->irq,
51 &iio_trigger_generic_data_rdy_poll,
52 IRQF_TRIGGER_RISING,
53 indio_dev->name,
54 adis->trig);
55 if (ret)
56 goto error_free_trig;
57
58 adis->trig->dev.parent = &adis->spi->dev;
59 adis->trig->ops = &adis_trigger_ops;
60 iio_trigger_set_drvdata(adis->trig, adis);
61 ret = iio_trigger_register(adis->trig);
62
63 indio_dev->trig = adis->trig;
64 if (ret)
65 goto error_free_irq;
66
67 return 0;
68
69 error_free_irq:
70 free_irq(adis->spi->irq, adis->trig);
71 error_free_trig:
72 iio_trigger_free(adis->trig);
73 return ret;
74 }
75 EXPORT_SYMBOL_GPL(adis_probe_trigger);
76
77 /**
78 * adis_remove_trigger() - Remove trigger for a adis devices
79 * @adis: The adis device
80 *
81 * Removes the trigger previously registered with adis_probe_trigger().
82 */
adis_remove_trigger(struct adis * adis)83 void adis_remove_trigger(struct adis *adis)
84 {
85 iio_trigger_unregister(adis->trig);
86 free_irq(adis->spi->irq, adis->trig);
87 iio_trigger_free(adis->trig);
88 }
89 EXPORT_SYMBOL_GPL(adis_remove_trigger);
90