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92d1079b JC |
1 | #include <linux/kernel.h> |
2 | #include <linux/slab.h> | |
3 | #include <linux/err.h> | |
4 | #include <linux/export.h> | |
5 | #include <linux/iio/buffer.h> | |
6 | #include <linux/iio/consumer.h> | |
7 | ||
8 | struct iio_cb_buffer { | |
9 | struct iio_buffer buffer; | |
10 | int (*cb)(u8 *data, void *private); | |
11 | void *private; | |
12 | struct iio_channel *channels; | |
13 | }; | |
14 | ||
15 | static int iio_buffer_cb_store_to(struct iio_buffer *buffer, u8 *data) | |
16 | { | |
17 | struct iio_cb_buffer *cb_buff = container_of(buffer, | |
18 | struct iio_cb_buffer, | |
19 | buffer); | |
20 | ||
21 | return cb_buff->cb(data, cb_buff->private); | |
22 | } | |
23 | ||
24 | static struct iio_buffer_access_funcs iio_cb_access = { | |
25 | .store_to = &iio_buffer_cb_store_to, | |
26 | }; | |
27 | ||
ca7d98db | 28 | struct iio_cb_buffer *iio_channel_get_all_cb(struct device *dev, |
92d1079b JC |
29 | int (*cb)(u8 *data, |
30 | void *private), | |
31 | void *private) | |
32 | { | |
33 | int ret; | |
34 | struct iio_cb_buffer *cb_buff; | |
35 | struct iio_dev *indio_dev; | |
36 | struct iio_channel *chan; | |
37 | ||
38 | cb_buff = kzalloc(sizeof(*cb_buff), GFP_KERNEL); | |
39 | if (cb_buff == NULL) { | |
40 | ret = -ENOMEM; | |
41 | goto error_ret; | |
42 | } | |
43 | ||
44 | cb_buff->private = private; | |
45 | cb_buff->cb = cb; | |
46 | cb_buff->buffer.access = &iio_cb_access; | |
47 | INIT_LIST_HEAD(&cb_buff->buffer.demux_list); | |
48 | ||
ca7d98db | 49 | cb_buff->channels = iio_channel_get_all(dev); |
92d1079b JC |
50 | if (IS_ERR(cb_buff->channels)) { |
51 | ret = PTR_ERR(cb_buff->channels); | |
52 | goto error_free_cb_buff; | |
53 | } | |
54 | ||
55 | indio_dev = cb_buff->channels[0].indio_dev; | |
56 | cb_buff->buffer.scan_mask | |
57 | = kcalloc(BITS_TO_LONGS(indio_dev->masklength), sizeof(long), | |
58 | GFP_KERNEL); | |
59 | if (cb_buff->buffer.scan_mask == NULL) { | |
60 | ret = -ENOMEM; | |
61 | goto error_release_channels; | |
62 | } | |
63 | chan = &cb_buff->channels[0]; | |
64 | while (chan->indio_dev) { | |
65 | if (chan->indio_dev != indio_dev) { | |
66 | ret = -EINVAL; | |
67 | goto error_release_channels; | |
68 | } | |
69 | set_bit(chan->channel->scan_index, | |
70 | cb_buff->buffer.scan_mask); | |
71 | chan++; | |
72 | } | |
73 | ||
74 | return cb_buff; | |
75 | ||
76 | error_release_channels: | |
77 | iio_channel_release_all(cb_buff->channels); | |
78 | error_free_cb_buff: | |
79 | kfree(cb_buff); | |
80 | error_ret: | |
81 | return ERR_PTR(ret); | |
82 | } | |
83 | EXPORT_SYMBOL_GPL(iio_channel_get_all_cb); | |
84 | ||
85 | int iio_channel_start_all_cb(struct iio_cb_buffer *cb_buff) | |
86 | { | |
87 | return iio_update_buffers(cb_buff->channels[0].indio_dev, | |
88 | &cb_buff->buffer, | |
89 | NULL); | |
90 | } | |
91 | EXPORT_SYMBOL_GPL(iio_channel_start_all_cb); | |
92 | ||
93 | void iio_channel_stop_all_cb(struct iio_cb_buffer *cb_buff) | |
94 | { | |
95 | iio_update_buffers(cb_buff->channels[0].indio_dev, | |
96 | NULL, | |
97 | &cb_buff->buffer); | |
98 | } | |
99 | EXPORT_SYMBOL_GPL(iio_channel_stop_all_cb); | |
100 | ||
101 | void iio_channel_release_all_cb(struct iio_cb_buffer *cb_buff) | |
102 | { | |
103 | iio_channel_release_all(cb_buff->channels); | |
104 | kfree(cb_buff); | |
105 | } | |
106 | EXPORT_SYMBOL_GPL(iio_channel_release_all_cb); | |
107 | ||
108 | struct iio_channel | |
109 | *iio_channel_cb_get_channels(const struct iio_cb_buffer *cb_buffer) | |
110 | { | |
111 | return cb_buffer->channels; | |
112 | } | |
113 | EXPORT_SYMBOL_GPL(iio_channel_cb_get_channels); |