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2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
735ad074 VB |
2 | /* |
3 | * Copyright (C) 2015 Cogent Embedded, Inc. | |
735ad074 VB |
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 | indio_dev->id); | |
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"); |