/** * 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; }