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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
19static const struct iio_buffer_setup_ops iio_triggered_buffer_setup_ops = {
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 * @h: Function which will be used as pollfunc top half
28 * @thread: Function which will be used as pollfunc bottom 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
35 * pollfunc.
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 */
44int iio_triggered_buffer_setup(struct iio_dev *indio_dev,
45 irqreturn_t (*h)(int irq, void *p),
46 irqreturn_t (*thread)(int irq, void *p),
47 const struct iio_buffer_setup_ops *setup_ops)
48{
49 struct iio_buffer *buffer;
50 int ret;
51
52 buffer = iio_kfifo_allocate();
53 if (!buffer) {
54 ret = -ENOMEM;
55 goto error_ret;
56 }
57
58 iio_device_attach_buffer(indio_dev, buffer);
59
60 indio_dev->pollfunc = iio_alloc_pollfunc(h,
61 thread,
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
81 return 0;
82
83error_kfifo_free:
84 iio_kfifo_free(indio_dev->buffer);
85error_ret:
86 return ret;
87}
88EXPORT_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 */
94void iio_triggered_buffer_cleanup(struct iio_dev *indio_dev)
95{
96 iio_dealloc_pollfunc(indio_dev->pollfunc);
97 iio_kfifo_free(indio_dev->buffer);
98}
99EXPORT_SYMBOL(iio_triggered_buffer_cleanup);
100
101static void devm_iio_triggered_buffer_clean(struct device *dev, void *res)
102{
103 iio_triggered_buffer_cleanup(*(struct iio_dev **)res);
104}
105
106int devm_iio_triggered_buffer_setup(struct device *dev,
107 struct iio_dev *indio_dev,
108 irqreturn_t (*h)(int irq, void *p),
109 irqreturn_t (*thread)(int irq, void *p),
110 const struct iio_buffer_setup_ops *ops)
111{
112 struct iio_dev **ptr;
113 int ret;
114
115 ptr = devres_alloc(devm_iio_triggered_buffer_clean, sizeof(*ptr),
116 GFP_KERNEL);
117 if (!ptr)
118 return -ENOMEM;
119
120 *ptr = indio_dev;
121
122 ret = iio_triggered_buffer_setup(indio_dev, h, thread, ops);
123 if (!ret)
124 devres_add(dev, ptr);
125 else
126 devres_free(ptr);
127
128 return ret;
129}
130EXPORT_SYMBOL_GPL(devm_iio_triggered_buffer_setup);
131
132void devm_iio_triggered_buffer_cleanup(struct device *dev,
133 struct iio_dev *indio_dev)
134{
135 int rc;
136
137 rc = devres_release(dev, devm_iio_triggered_buffer_clean,
138 devm_iio_device_match, indio_dev);
139 WARN_ON(rc);
140}
141EXPORT_SYMBOL_GPL(devm_iio_triggered_buffer_cleanup);
142
143MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
144MODULE_DESCRIPTION("IIO helper functions for setting up triggered buffers");
145MODULE_LICENSE("GPL");
1// SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (c) 2012 Analog Devices, Inc.
4 * Author: Lars-Peter Clausen <lars@metafoo.de>
5 */
6
7#include <linux/kernel.h>
8#include <linux/export.h>
9#include <linux/module.h>
10#include <linux/iio/iio.h>
11#include <linux/iio/buffer.h>
12#include <linux/iio/buffer_impl.h>
13#include <linux/iio/kfifo_buf.h>
14#include <linux/iio/triggered_buffer.h>
15#include <linux/iio/trigger_consumer.h>
16
17/**
18 * iio_triggered_buffer_setup_ext() - Setup triggered buffer and pollfunc
19 * @indio_dev: IIO device structure
20 * @h: Function which will be used as pollfunc top half
21 * @thread: Function which will be used as pollfunc bottom half
22 * @setup_ops: Buffer setup functions to use for this device.
23 * If NULL the default setup functions for triggered
24 * buffers will be used.
25 * @buffer_attrs: Extra sysfs buffer attributes for this IIO buffer
26 *
27 * This function combines some common tasks which will normally be performed
28 * when setting up a triggered buffer. It will allocate the buffer and the
29 * pollfunc.
30 *
31 * Before calling this function the indio_dev structure should already be
32 * completely initialized, but not yet registered. In practice this means that
33 * this function should be called right before iio_device_register().
34 *
35 * To free the resources allocated by this function call
36 * iio_triggered_buffer_cleanup().
37 */
38int iio_triggered_buffer_setup_ext(struct iio_dev *indio_dev,
39 irqreturn_t (*h)(int irq, void *p),
40 irqreturn_t (*thread)(int irq, void *p),
41 const struct iio_buffer_setup_ops *setup_ops,
42 const struct attribute **buffer_attrs)
43{
44 struct iio_buffer *buffer;
45 int ret;
46
47 buffer = iio_kfifo_allocate();
48 if (!buffer) {
49 ret = -ENOMEM;
50 goto error_ret;
51 }
52
53 indio_dev->pollfunc = iio_alloc_pollfunc(h,
54 thread,
55 IRQF_ONESHOT,
56 indio_dev,
57 "%s_consumer%d",
58 indio_dev->name,
59 iio_device_id(indio_dev));
60 if (indio_dev->pollfunc == NULL) {
61 ret = -ENOMEM;
62 goto error_kfifo_free;
63 }
64
65 /* Ring buffer functions - here trigger setup related */
66 indio_dev->setup_ops = setup_ops;
67
68 /* Flag that polled ring buffering is possible */
69 indio_dev->modes |= INDIO_BUFFER_TRIGGERED;
70
71 buffer->attrs = buffer_attrs;
72
73 ret = iio_device_attach_buffer(indio_dev, buffer);
74 if (ret < 0)
75 goto error_dealloc_pollfunc;
76
77 return 0;
78
79error_dealloc_pollfunc:
80 iio_dealloc_pollfunc(indio_dev->pollfunc);
81error_kfifo_free:
82 iio_kfifo_free(buffer);
83error_ret:
84 return ret;
85}
86EXPORT_SYMBOL(iio_triggered_buffer_setup_ext);
87
88/**
89 * iio_triggered_buffer_cleanup() - Free resources allocated by iio_triggered_buffer_setup_ext()
90 * @indio_dev: IIO device structure
91 */
92void iio_triggered_buffer_cleanup(struct iio_dev *indio_dev)
93{
94 iio_dealloc_pollfunc(indio_dev->pollfunc);
95 iio_kfifo_free(indio_dev->buffer);
96}
97EXPORT_SYMBOL(iio_triggered_buffer_cleanup);
98
99static void devm_iio_triggered_buffer_clean(void *indio_dev)
100{
101 iio_triggered_buffer_cleanup(indio_dev);
102}
103
104int devm_iio_triggered_buffer_setup_ext(struct device *dev,
105 struct iio_dev *indio_dev,
106 irqreturn_t (*h)(int irq, void *p),
107 irqreturn_t (*thread)(int irq, void *p),
108 const struct iio_buffer_setup_ops *ops,
109 const struct attribute **buffer_attrs)
110{
111 int ret;
112
113 ret = iio_triggered_buffer_setup_ext(indio_dev, h, thread, ops,
114 buffer_attrs);
115 if (ret)
116 return ret;
117
118 return devm_add_action_or_reset(dev, devm_iio_triggered_buffer_clean,
119 indio_dev);
120}
121EXPORT_SYMBOL_GPL(devm_iio_triggered_buffer_setup_ext);
122
123MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
124MODULE_DESCRIPTION("IIO helper functions for setting up triggered buffers");
125MODULE_LICENSE("GPL");