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staging:iio:buffer: pull computation of scan length into a utility function.

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Principal reason is to make later patches more coherent and easier to review
but this set in itself separates a logical entity out nicely wihin the code.

Signed-off-by: Jonathan Cameron <jic23@kernel.org>
Acked-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jonathan Cameron 2012-04-21 10:09:33 +01:00 committed by Greg Kroah-Hartman
parent a714af276f
commit 6b3b58ed15
1 changed files with 28 additions and 16 deletions
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44
drivers/staging/iio/industrialio-buffer.c
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@ -508,29 +508,41 @@ static const unsigned long *iio_scan_mask_match(const unsigned long *av_masks,
return NULL;
}
int iio_sw_buffer_preenable(struct iio_dev *indio_dev)
static int iio_compute_scan_bytes(struct iio_dev *indio_dev, const long *mask,
bool timestamp)
{
struct iio_buffer *buffer = indio_dev->buffer;
const struct iio_chan_spec *ch;
unsigned bytes = 0;
int length, i;
/* How much space will the demuxed element take? */
for_each_set_bit(i, mask,
indio_dev->masklength) {
ch = iio_find_channel_from_si(indio_dev, i);
length = ch->scan_type.storagebits / 8;
bytes = ALIGN(bytes, length);
bytes += length;
}
if (timestamp) {
ch = iio_find_channel_from_si(indio_dev,
indio_dev
->buffer->scan_index_timestamp);
length = ch->scan_type.storagebits / 8;
bytes = ALIGN(bytes, length);
bytes += length;
}
return bytes;
}
int iio_sw_buffer_preenable(struct iio_dev *indio_dev)
{
struct iio_buffer *buffer = indio_dev->buffer;
unsigned bytes;
dev_dbg(&indio_dev->dev, "%s\n", __func__);
/* How much space will the demuxed element take? */
for_each_set_bit(i, buffer->scan_mask,
indio_dev->masklength) {
ch = iio_find_channel_from_si(indio_dev, i);
length = ch->scan_type.storagebits/8;
bytes = ALIGN(bytes, length);
bytes += length;
}
if (buffer->scan_timestamp) {
ch = iio_find_channel_from_si(indio_dev,
buffer->scan_index_timestamp);
length = ch->scan_type.storagebits/8;
bytes = ALIGN(bytes, length);
bytes += length;
}
bytes = iio_compute_scan_bytes(indio_dev, buffer->scan_mask,
buffer->scan_timestamp);
buffer->access->set_bytes_per_datum(buffer, bytes);
/* What scan mask do we actually have ?*/