125 lines
3.1 KiB
C
125 lines
3.1 KiB
C
#include <linux/kernel.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/err.h>
|
|
#include <linux/export.h>
|
|
#include <linux/iio/buffer.h>
|
|
#include <linux/iio/consumer.h>
|
|
|
|
struct iio_cb_buffer {
|
|
struct iio_buffer buffer;
|
|
int (*cb)(const void *data, void *private);
|
|
void *private;
|
|
struct iio_channel *channels;
|
|
};
|
|
|
|
static struct iio_cb_buffer *buffer_to_cb_buffer(struct iio_buffer *buffer)
|
|
{
|
|
return container_of(buffer, struct iio_cb_buffer, buffer);
|
|
}
|
|
|
|
static int iio_buffer_cb_store_to(struct iio_buffer *buffer, const void *data)
|
|
{
|
|
struct iio_cb_buffer *cb_buff = buffer_to_cb_buffer(buffer);
|
|
return cb_buff->cb(data, cb_buff->private);
|
|
}
|
|
|
|
static void iio_buffer_cb_release(struct iio_buffer *buffer)
|
|
{
|
|
struct iio_cb_buffer *cb_buff = buffer_to_cb_buffer(buffer);
|
|
kfree(cb_buff->buffer.scan_mask);
|
|
kfree(cb_buff);
|
|
}
|
|
|
|
static const struct iio_buffer_access_funcs iio_cb_access = {
|
|
.store_to = &iio_buffer_cb_store_to,
|
|
.release = &iio_buffer_cb_release,
|
|
};
|
|
|
|
struct iio_cb_buffer *iio_channel_get_all_cb(struct device *dev,
|
|
int (*cb)(const void *data,
|
|
void *private),
|
|
void *private)
|
|
{
|
|
int ret;
|
|
struct iio_cb_buffer *cb_buff;
|
|
struct iio_dev *indio_dev;
|
|
struct iio_channel *chan;
|
|
|
|
cb_buff = kzalloc(sizeof(*cb_buff), GFP_KERNEL);
|
|
if (cb_buff == NULL)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
iio_buffer_init(&cb_buff->buffer);
|
|
|
|
cb_buff->private = private;
|
|
cb_buff->cb = cb;
|
|
cb_buff->buffer.access = &iio_cb_access;
|
|
INIT_LIST_HEAD(&cb_buff->buffer.demux_list);
|
|
|
|
cb_buff->channels = iio_channel_get_all(dev);
|
|
if (IS_ERR(cb_buff->channels)) {
|
|
ret = PTR_ERR(cb_buff->channels);
|
|
goto error_free_cb_buff;
|
|
}
|
|
|
|
indio_dev = cb_buff->channels[0].indio_dev;
|
|
cb_buff->buffer.scan_mask
|
|
= kcalloc(BITS_TO_LONGS(indio_dev->masklength), sizeof(long),
|
|
GFP_KERNEL);
|
|
if (cb_buff->buffer.scan_mask == NULL) {
|
|
ret = -ENOMEM;
|
|
goto error_release_channels;
|
|
}
|
|
chan = &cb_buff->channels[0];
|
|
while (chan->indio_dev) {
|
|
if (chan->indio_dev != indio_dev) {
|
|
ret = -EINVAL;
|
|
goto error_free_scan_mask;
|
|
}
|
|
set_bit(chan->channel->scan_index,
|
|
cb_buff->buffer.scan_mask);
|
|
chan++;
|
|
}
|
|
|
|
return cb_buff;
|
|
|
|
error_free_scan_mask:
|
|
kfree(cb_buff->buffer.scan_mask);
|
|
error_release_channels:
|
|
iio_channel_release_all(cb_buff->channels);
|
|
error_free_cb_buff:
|
|
kfree(cb_buff);
|
|
return ERR_PTR(ret);
|
|
}
|
|
EXPORT_SYMBOL_GPL(iio_channel_get_all_cb);
|
|
|
|
int iio_channel_start_all_cb(struct iio_cb_buffer *cb_buff)
|
|
{
|
|
return iio_update_buffers(cb_buff->channels[0].indio_dev,
|
|
&cb_buff->buffer,
|
|
NULL);
|
|
}
|
|
EXPORT_SYMBOL_GPL(iio_channel_start_all_cb);
|
|
|
|
void iio_channel_stop_all_cb(struct iio_cb_buffer *cb_buff)
|
|
{
|
|
iio_update_buffers(cb_buff->channels[0].indio_dev,
|
|
NULL,
|
|
&cb_buff->buffer);
|
|
}
|
|
EXPORT_SYMBOL_GPL(iio_channel_stop_all_cb);
|
|
|
|
void iio_channel_release_all_cb(struct iio_cb_buffer *cb_buff)
|
|
{
|
|
iio_channel_release_all(cb_buff->channels);
|
|
iio_buffer_put(&cb_buff->buffer);
|
|
}
|
|
EXPORT_SYMBOL_GPL(iio_channel_release_all_cb);
|
|
|
|
struct iio_channel
|
|
*iio_channel_cb_get_channels(const struct iio_cb_buffer *cb_buffer)
|
|
{
|
|
return cb_buffer->channels;
|
|
}
|
|
EXPORT_SYMBOL_GPL(iio_channel_cb_get_channels);
|