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staging:iio:adc:ad7793 use iio_sw_buffer_preenable to avoid repitition.

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Now the generic function caches the scan size a lot of what was here
was redundant and is removed.

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 10:09:39 +01:00 committed by Greg Kroah-Hartman
parent 46df6378c8
commit 81a4fc0121
1 changed files with 4 additions and 17 deletions
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21
drivers/staging/iio/adc/ad7793.c
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@ -319,31 +319,18 @@ out:
static int ad7793_ring_preenable(struct iio_dev *indio_dev)
{
struct ad7793_state *st = iio_priv(indio_dev);
struct iio_buffer *ring = indio_dev->buffer;
size_t d_size;
unsigned channel;
int ret;
if (bitmap_empty(indio_dev->active_scan_mask, indio_dev->masklength))
return -EINVAL;
ret = iio_sw_buffer_preenable(indio_dev);
if (ret < 0)
return ret;
channel = find_first_bit(indio_dev->active_scan_mask,
indio_dev->masklength);
d_size = bitmap_weight(indio_dev->active_scan_mask,
indio_dev->masklength) *
indio_dev->channels[0].scan_type.storagebits / 8;
if (ring->scan_timestamp) {
d_size += sizeof(s64);
if (d_size % sizeof(s64))
d_size += sizeof(s64) - (d_size % sizeof(s64));
}
if (indio_dev->buffer->access->set_bytes_per_datum)
indio_dev->buffer->access->
set_bytes_per_datum(indio_dev->buffer, d_size);
st->mode = (st->mode & ~AD7793_MODE_SEL(-1)) |
AD7793_MODE_SEL(AD7793_MODE_CONT);
st->conf = (st->conf & ~AD7793_CONF_CHAN(-1)) |