1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * Copyright (C) 2015 Cogent Embedded, Inc.
4  */
5 
6 #include <linux/kernel.h>
7 #include <linux/export.h>
8 #include <linux/module.h>
9 #include <linux/iio/iio.h>
10 #include <linux/iio/triggered_event.h>
11 #include <linux/iio/trigger_consumer.h>
12 
13 /**
14  * iio_triggered_event_setup() - Setup pollfunc_event for triggered event
15  * @indio_dev:	IIO device structure
16  * @h:		Function which will be used as pollfunc_event top half
17  * @thread:	Function which will be used as pollfunc_event bottom half
18  *
19  * This function combines some common tasks which will normally be performed
20  * when setting up a triggered event. It will allocate the pollfunc_event and
21  * set mode to use it for triggered event.
22  *
23  * Before calling this function the indio_dev structure should already be
24  * completely initialized, but not yet registered. In practice this means that
25  * this function should be called right before iio_device_register().
26  *
27  * To free the resources allocated by this function call
28  * iio_triggered_event_cleanup().
29  */
30 int iio_triggered_event_setup(struct iio_dev *indio_dev,
31 			      irqreturn_t (*h)(int irq, void *p),
32 			      irqreturn_t (*thread)(int irq, void *p))
33 {
34 	indio_dev->pollfunc_event = iio_alloc_pollfunc(h,
35 						       thread,
36 						       IRQF_ONESHOT,
37 						       indio_dev,
38 						       "%s_consumer%d",
39 						       indio_dev->name,
40 						       iio_device_id(indio_dev));
41 	if (indio_dev->pollfunc_event == NULL)
42 		return -ENOMEM;
43 
44 	/* Flag that events polling is possible */
45 	indio_dev->modes |= INDIO_EVENT_TRIGGERED;
46 
47 	return 0;
48 }
49 EXPORT_SYMBOL(iio_triggered_event_setup);
50 
51 /**
52  * iio_triggered_event_cleanup() - Free resources allocated by iio_triggered_event_setup()
53  * @indio_dev: IIO device structure
54  */
55 void iio_triggered_event_cleanup(struct iio_dev *indio_dev)
56 {
57 	indio_dev->modes &= ~INDIO_EVENT_TRIGGERED;
58 	iio_dealloc_pollfunc(indio_dev->pollfunc_event);
59 }
60 EXPORT_SYMBOL(iio_triggered_event_cleanup);
61 
62 MODULE_AUTHOR("Vladimir Barinov");
63 MODULE_DESCRIPTION("IIO helper functions for setting up triggered events");
64 MODULE_LICENSE("GPL");
65