1 /*
2 * STMicroelectronics sensors trigger library driver
3 *
4 * Copyright 2012-2013 STMicroelectronics Inc.
5 *
6 * Denis Ciocca <denis.ciocca@st.com>
7 *
8 * Licensed under the GPL-2.
9 */
10
11 #include <linux/kernel.h>
12 #include <linux/module.h>
13 #include <linux/slab.h>
14 #include <linux/iio/iio.h>
15 #include <linux/iio/trigger.h>
16 #include <linux/interrupt.h>
17
18 #include <linux/iio/common/st_sensors.h>
19
20
st_sensors_allocate_trigger(struct iio_dev * indio_dev,const struct iio_trigger_ops * trigger_ops)21 int st_sensors_allocate_trigger(struct iio_dev *indio_dev,
22 const struct iio_trigger_ops *trigger_ops)
23 {
24 int err;
25 struct st_sensor_data *sdata = iio_priv(indio_dev);
26
27 sdata->trig = iio_trigger_alloc("%s-trigger", indio_dev->name);
28 if (sdata->trig == NULL) {
29 err = -ENOMEM;
30 dev_err(&indio_dev->dev, "failed to allocate iio trigger.\n");
31 goto iio_trigger_alloc_error;
32 }
33
34 err = request_threaded_irq(sdata->get_irq_data_ready(indio_dev),
35 iio_trigger_generic_data_rdy_poll,
36 NULL,
37 IRQF_TRIGGER_RISING,
38 sdata->trig->name,
39 sdata->trig);
40 if (err) {
41 dev_err(&indio_dev->dev, "failed to request trigger IRQ.\n");
42 goto request_irq_error;
43 }
44
45 iio_trigger_set_drvdata(sdata->trig, indio_dev);
46 sdata->trig->ops = trigger_ops;
47 sdata->trig->dev.parent = sdata->dev;
48
49 err = iio_trigger_register(sdata->trig);
50 if (err < 0) {
51 dev_err(&indio_dev->dev, "failed to register iio trigger.\n");
52 goto iio_trigger_register_error;
53 }
54 indio_dev->trig = iio_trigger_get(sdata->trig);
55
56 return 0;
57
58 iio_trigger_register_error:
59 free_irq(sdata->get_irq_data_ready(indio_dev), sdata->trig);
60 request_irq_error:
61 iio_trigger_free(sdata->trig);
62 iio_trigger_alloc_error:
63 return err;
64 }
65 EXPORT_SYMBOL(st_sensors_allocate_trigger);
66
st_sensors_deallocate_trigger(struct iio_dev * indio_dev)67 void st_sensors_deallocate_trigger(struct iio_dev *indio_dev)
68 {
69 struct st_sensor_data *sdata = iio_priv(indio_dev);
70
71 iio_trigger_unregister(sdata->trig);
72 free_irq(sdata->get_irq_data_ready(indio_dev), sdata->trig);
73 iio_trigger_free(sdata->trig);
74 }
75 EXPORT_SYMBOL(st_sensors_deallocate_trigger);
76
77 MODULE_AUTHOR("Denis Ciocca <denis.ciocca@st.com>");
78 MODULE_DESCRIPTION("STMicroelectronics ST-sensors trigger");
79 MODULE_LICENSE("GPL v2");
80