1 #include <linux/kernel.h>
2 #include <linux/slab.h>
4 #include <linux/export.h>
5 #include <linux/iio/buffer.h>
6 #include <linux/iio/consumer.h>
9 struct iio_buffer buffer;
10 int (*cb)(const void *data, void *private);
12 struct iio_channel *channels;
15 static struct iio_cb_buffer *buffer_to_cb_buffer(struct iio_buffer *buffer)
17 return container_of(buffer, struct iio_cb_buffer, buffer);
20 static int iio_buffer_cb_store_to(struct iio_buffer *buffer, const void *data)
22 struct iio_cb_buffer *cb_buff = buffer_to_cb_buffer(buffer);
23 return cb_buff->cb(data, cb_buff->private);
26 static void iio_buffer_cb_release(struct iio_buffer *buffer)
28 struct iio_cb_buffer *cb_buff = buffer_to_cb_buffer(buffer);
29 kfree(cb_buff->buffer.scan_mask);
33 static const struct iio_buffer_access_funcs iio_cb_access = {
34 .store_to = &iio_buffer_cb_store_to,
35 .release = &iio_buffer_cb_release,
38 struct iio_cb_buffer *iio_channel_get_all_cb(struct device *dev,
39 int (*cb)(const void *data,
44 struct iio_cb_buffer *cb_buff;
45 struct iio_dev *indio_dev;
46 struct iio_channel *chan;
48 cb_buff = kzalloc(sizeof(*cb_buff), GFP_KERNEL);
49 if (cb_buff == NULL) {
54 iio_buffer_init(&cb_buff->buffer);
56 cb_buff->private = private;
58 cb_buff->buffer.access = &iio_cb_access;
59 INIT_LIST_HEAD(&cb_buff->buffer.demux_list);
61 cb_buff->channels = iio_channel_get_all(dev);
62 if (IS_ERR(cb_buff->channels)) {
63 ret = PTR_ERR(cb_buff->channels);
64 goto error_free_cb_buff;
67 indio_dev = cb_buff->channels[0].indio_dev;
68 cb_buff->buffer.scan_mask
69 = kcalloc(BITS_TO_LONGS(indio_dev->masklength), sizeof(long),
71 if (cb_buff->buffer.scan_mask == NULL) {
73 goto error_release_channels;
75 chan = &cb_buff->channels[0];
76 while (chan->indio_dev) {
77 if (chan->indio_dev != indio_dev) {
79 goto error_free_scan_mask;
81 set_bit(chan->channel->scan_index,
82 cb_buff->buffer.scan_mask);
89 kfree(cb_buff->buffer.scan_mask);
90 error_release_channels:
91 iio_channel_release_all(cb_buff->channels);
97 EXPORT_SYMBOL_GPL(iio_channel_get_all_cb);
99 int iio_channel_start_all_cb(struct iio_cb_buffer *cb_buff)
101 return iio_update_buffers(cb_buff->channels[0].indio_dev,
105 EXPORT_SYMBOL_GPL(iio_channel_start_all_cb);
107 void iio_channel_stop_all_cb(struct iio_cb_buffer *cb_buff)
109 iio_update_buffers(cb_buff->channels[0].indio_dev,
113 EXPORT_SYMBOL_GPL(iio_channel_stop_all_cb);
115 void iio_channel_release_all_cb(struct iio_cb_buffer *cb_buff)
117 iio_channel_release_all(cb_buff->channels);
118 iio_buffer_put(&cb_buff->buffer);
120 EXPORT_SYMBOL_GPL(iio_channel_release_all_cb);
123 *iio_channel_cb_get_channels(const struct iio_cb_buffer *cb_buffer)
125 return cb_buffer->channels;
127 EXPORT_SYMBOL_GPL(iio_channel_cb_get_channels);