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23f2d735 LPC |
1 | /* |
2 | * Copyright (c) 2012 Analog Devices, Inc. | |
3 | * Author: Lars-Peter Clausen <lars@metafoo.de> | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify it | |
6 | * under the terms of the GNU General Public License version 2 as published by | |
7 | * the Free Software Foundation. | |
8 | */ | |
9 | ||
10 | #include <linux/kernel.h> | |
11 | #include <linux/export.h> | |
12 | #include <linux/module.h> | |
13 | #include <linux/iio/iio.h> | |
14 | #include <linux/iio/buffer.h> | |
15 | #include <linux/iio/kfifo_buf.h> | |
16 | #include <linux/iio/triggered_buffer.h> | |
17 | #include <linux/iio/trigger_consumer.h> | |
18 | ||
19 | static const struct iio_buffer_setup_ops iio_triggered_buffer_setup_ops = { | |
23f2d735 LPC |
20 | .postenable = &iio_triggered_buffer_postenable, |
21 | .predisable = &iio_triggered_buffer_predisable, | |
22 | }; | |
23 | ||
24 | /** | |
25 | * iio_triggered_buffer_setup() - Setup triggered buffer and pollfunc | |
26 | * @indio_dev: IIO device structure | |
27 | * @pollfunc_bh: Function which will be used as pollfunc bottom half | |
28 | * @pollfunc_th: Function which will be used as pollfunc top half | |
29 | * @setup_ops: Buffer setup functions to use for this device. | |
30 | * If NULL the default setup functions for triggered | |
31 | * buffers will be used. | |
32 | * | |
33 | * This function combines some common tasks which will normally be performed | |
34 | * when setting up a triggered buffer. It will allocate the buffer and the | |
3e1b6c95 | 35 | * pollfunc. |
23f2d735 LPC |
36 | * |
37 | * Before calling this function the indio_dev structure should already be | |
38 | * completely initialized, but not yet registered. In practice this means that | |
39 | * this function should be called right before iio_device_register(). | |
40 | * | |
41 | * To free the resources allocated by this function call | |
42 | * iio_triggered_buffer_cleanup(). | |
43 | */ | |
44 | int iio_triggered_buffer_setup(struct iio_dev *indio_dev, | |
45 | irqreturn_t (*pollfunc_bh)(int irq, void *p), | |
46 | irqreturn_t (*pollfunc_th)(int irq, void *p), | |
47 | const struct iio_buffer_setup_ops *setup_ops) | |
48 | { | |
9e69c935 | 49 | struct iio_buffer *buffer; |
23f2d735 LPC |
50 | int ret; |
51 | ||
7ab374a0 | 52 | buffer = iio_kfifo_allocate(); |
9e69c935 | 53 | if (!buffer) { |
23f2d735 LPC |
54 | ret = -ENOMEM; |
55 | goto error_ret; | |
56 | } | |
57 | ||
9e69c935 LPC |
58 | iio_device_attach_buffer(indio_dev, buffer); |
59 | ||
23f2d735 LPC |
60 | indio_dev->pollfunc = iio_alloc_pollfunc(pollfunc_bh, |
61 | pollfunc_th, | |
62 | IRQF_ONESHOT, | |
63 | indio_dev, | |
64 | "%s_consumer%d", | |
65 | indio_dev->name, | |
66 | indio_dev->id); | |
67 | if (indio_dev->pollfunc == NULL) { | |
68 | ret = -ENOMEM; | |
69 | goto error_kfifo_free; | |
70 | } | |
71 | ||
72 | /* Ring buffer functions - here trigger setup related */ | |
73 | if (setup_ops) | |
74 | indio_dev->setup_ops = setup_ops; | |
75 | else | |
76 | indio_dev->setup_ops = &iio_triggered_buffer_setup_ops; | |
77 | ||
78 | /* Flag that polled ring buffering is possible */ | |
79 | indio_dev->modes |= INDIO_BUFFER_TRIGGERED; | |
80 | ||
23f2d735 LPC |
81 | return 0; |
82 | ||
23f2d735 LPC |
83 | error_kfifo_free: |
84 | iio_kfifo_free(indio_dev->buffer); | |
85 | error_ret: | |
86 | return ret; | |
87 | } | |
88 | EXPORT_SYMBOL(iio_triggered_buffer_setup); | |
89 | ||
90 | /** | |
91 | * iio_triggered_buffer_cleanup() - Free resources allocated by iio_triggered_buffer_setup() | |
92 | * @indio_dev: IIO device structure | |
93 | */ | |
94 | void iio_triggered_buffer_cleanup(struct iio_dev *indio_dev) | |
95 | { | |
23f2d735 LPC |
96 | iio_dealloc_pollfunc(indio_dev->pollfunc); |
97 | iio_kfifo_free(indio_dev->buffer); | |
98 | } | |
99 | EXPORT_SYMBOL(iio_triggered_buffer_cleanup); | |
100 | ||
101 | MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>"); | |
102 | MODULE_DESCRIPTION("IIO helper functions for setting up triggered buffers"); | |
103 | MODULE_LICENSE("GPL"); |