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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 = { | |
20 | .preenable = &iio_sw_buffer_preenable, | |
21 | .postenable = &iio_triggered_buffer_postenable, | |
22 | .predisable = &iio_triggered_buffer_predisable, | |
23 | }; | |
24 | ||
25 | /** | |
26 | * iio_triggered_buffer_setup() - Setup triggered buffer and pollfunc | |
27 | * @indio_dev: IIO device structure | |
28 | * @pollfunc_bh: Function which will be used as pollfunc bottom half | |
29 | * @pollfunc_th: Function which will be used as pollfunc top half | |
30 | * @setup_ops: Buffer setup functions to use for this device. | |
31 | * If NULL the default setup functions for triggered | |
32 | * buffers will be used. | |
33 | * | |
34 | * This function combines some common tasks which will normally be performed | |
35 | * when setting up a triggered buffer. It will allocate the buffer and the | |
36 | * pollfunc, as well as register the buffer with the IIO core. | |
37 | * | |
38 | * Before calling this function the indio_dev structure should already be | |
39 | * completely initialized, but not yet registered. In practice this means that | |
40 | * this function should be called right before iio_device_register(). | |
41 | * | |
42 | * To free the resources allocated by this function call | |
43 | * iio_triggered_buffer_cleanup(). | |
44 | */ | |
45 | int iio_triggered_buffer_setup(struct iio_dev *indio_dev, | |
46 | irqreturn_t (*pollfunc_bh)(int irq, void *p), | |
47 | irqreturn_t (*pollfunc_th)(int irq, void *p), | |
48 | const struct iio_buffer_setup_ops *setup_ops) | |
49 | { | |
50 | int ret; | |
51 | ||
52 | indio_dev->buffer = iio_kfifo_allocate(indio_dev); | |
53 | if (!indio_dev->buffer) { | |
54 | ret = -ENOMEM; | |
55 | goto error_ret; | |
56 | } | |
57 | ||
58 | indio_dev->pollfunc = iio_alloc_pollfunc(pollfunc_bh, | |
59 | pollfunc_th, | |
60 | IRQF_ONESHOT, | |
61 | indio_dev, | |
62 | "%s_consumer%d", | |
63 | indio_dev->name, | |
64 | indio_dev->id); | |
65 | if (indio_dev->pollfunc == NULL) { | |
66 | ret = -ENOMEM; | |
67 | goto error_kfifo_free; | |
68 | } | |
69 | ||
70 | /* Ring buffer functions - here trigger setup related */ | |
71 | if (setup_ops) | |
72 | indio_dev->setup_ops = setup_ops; | |
73 | else | |
74 | indio_dev->setup_ops = &iio_triggered_buffer_setup_ops; | |
75 | ||
76 | /* Flag that polled ring buffering is possible */ | |
77 | indio_dev->modes |= INDIO_BUFFER_TRIGGERED; | |
78 | ||
79 | ret = iio_buffer_register(indio_dev, | |
80 | indio_dev->channels, | |
81 | indio_dev->num_channels); | |
82 | if (ret) | |
83 | goto error_dealloc_pollfunc; | |
84 | ||
85 | return 0; | |
86 | ||
87 | error_dealloc_pollfunc: | |
88 | iio_dealloc_pollfunc(indio_dev->pollfunc); | |
89 | error_kfifo_free: | |
90 | iio_kfifo_free(indio_dev->buffer); | |
91 | error_ret: | |
92 | return ret; | |
93 | } | |
94 | EXPORT_SYMBOL(iio_triggered_buffer_setup); | |
95 | ||
96 | /** | |
97 | * iio_triggered_buffer_cleanup() - Free resources allocated by iio_triggered_buffer_setup() | |
98 | * @indio_dev: IIO device structure | |
99 | */ | |
100 | void iio_triggered_buffer_cleanup(struct iio_dev *indio_dev) | |
101 | { | |
102 | iio_buffer_unregister(indio_dev); | |
103 | iio_dealloc_pollfunc(indio_dev->pollfunc); | |
104 | iio_kfifo_free(indio_dev->buffer); | |
105 | } | |
106 | EXPORT_SYMBOL(iio_triggered_buffer_cleanup); | |
107 | ||
108 | MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>"); | |
109 | MODULE_DESCRIPTION("IIO helper functions for setting up triggered buffers"); | |
110 | MODULE_LICENSE("GPL"); |