/**
* max1363_ring_preenable() - setup the parameters of the ring before enabling
*
* The complex nature of the setting of the nuber of bytes per datum is due
* to this driver currently ensuring that the timestamp is stored at an 8
* byte boundary.
**/
static int max1363_ring_preenable(struct iio_dev *indio_dev)
{
struct max1363_state *st = indio_dev->dev_data;
struct iio_ring_buffer *ring = indio_dev->ring;
size_t d_size;
unsigned long numvals;
/*
* Need to figure out the current mode based upon the requested
* scan mask in iio_dev
*/
st->current_mode = max1363_match_mode(ring->scan_mask,
st->chip_info);
if (!st->current_mode)
return -EINVAL;
max1363_set_scan_mode(st);
numvals = hweight_long(st->current_mode->modemask);
if (ring->access.set_bytes_per_datum) {
if (st->chip_info->bits != 8)
d_size = numvals*2 + sizeof(s64);
else
d_size = numvals + sizeof(s64);
if (d_size % 8)
d_size += 8 - (d_size % 8);
ring->access.set_bytes_per_datum(ring, d_size);
}
return 0;
}
int max1363_update_scan_mode(struct iio_dev *indio_dev,
const unsigned long *scan_mask)
{
struct max1363_state *st = iio_priv(indio_dev);
/*
* Need to figure out the current mode based upon the requested
* scan mask in iio_dev
*/
st->current_mode = max1363_match_mode(scan_mask, st->chip_info);
if (!st->current_mode)
return -EINVAL;
max1363_set_scan_mode(st);
return 0;
}
