mirror of
https://github.com/FEX-Emu/linux.git
synced 2024-12-22 09:22:37 +00:00
92d1079b28
This callback buffer is meant to be opaque to users, but basically adds a very simple pass through buffer to which data may be pushed when it is inserted into the buffer list. Signed-off-by: Jonathan Cameron <jic23@kernel.org>
114 lines
2.6 KiB
C
114 lines
2.6 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)(u8 *data, void *private);
|
|
void *private;
|
|
struct iio_channel *channels;
|
|
};
|
|
|
|
static int iio_buffer_cb_store_to(struct iio_buffer *buffer, u8 *data)
|
|
{
|
|
struct iio_cb_buffer *cb_buff = container_of(buffer,
|
|
struct iio_cb_buffer,
|
|
buffer);
|
|
|
|
return cb_buff->cb(data, cb_buff->private);
|
|
}
|
|
|
|
static struct iio_buffer_access_funcs iio_cb_access = {
|
|
.store_to = &iio_buffer_cb_store_to,
|
|
};
|
|
|
|
struct iio_cb_buffer *iio_channel_get_all_cb(const char *name,
|
|
int (*cb)(u8 *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) {
|
|
ret = -ENOMEM;
|
|
goto error_ret;
|
|
}
|
|
|
|
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(name);
|
|
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_release_channels;
|
|
}
|
|
set_bit(chan->channel->scan_index,
|
|
cb_buff->buffer.scan_mask);
|
|
chan++;
|
|
}
|
|
|
|
return cb_buff;
|
|
|
|
error_release_channels:
|
|
iio_channel_release_all(cb_buff->channels);
|
|
error_free_cb_buff:
|
|
kfree(cb_buff);
|
|
error_ret:
|
|
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);
|
|
kfree(cb_buff);
|
|
}
|
|
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);
|