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 | fmt: "%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(pf: 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 | |