diff options
Diffstat (limited to 'drivers/staging/iio/ring_sw.c')
| -rw-r--r-- | drivers/staging/iio/ring_sw.c | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/drivers/staging/iio/ring_sw.c b/drivers/staging/iio/ring_sw.c index 294272d..ca0e79e4 100644 --- a/drivers/staging/iio/ring_sw.c +++ b/drivers/staging/iio/ring_sw.c @@ -431,5 +431,30 @@ void iio_sw_rb_free(struct iio_ring_buffer *r) iio_put_ring_buffer(r); } EXPORT_SYMBOL(iio_sw_rb_free); + +int iio_sw_ring_preenable(struct iio_dev *indio_dev) +{ + size_t size; + dev_dbg(&indio_dev->dev, "%s\n", __func__); + /* Check if there are any scan elements enabled, if not fail*/ + if (!(indio_dev->scan_count || indio_dev->scan_timestamp)) + return -EINVAL; + if (indio_dev->scan_timestamp) + if (indio_dev->scan_count) + /* Timestamp (aligned to s64) and data */ + size = (((indio_dev->scan_count * indio_dev->ring->bpe) + + sizeof(s64) - 1) + & ~(sizeof(s64) - 1)) + + sizeof(s64); + else /* Timestamp only */ + size = sizeof(s64); + else /* Data only */ + size = indio_dev->scan_count * indio_dev->ring->bpe; + indio_dev->ring->access.set_bpd(indio_dev->ring, size); + + return 0; +} +EXPORT_SYMBOL(iio_sw_ring_preenable); + MODULE_DESCRIPTION("Industrialio I/O software ring buffer"); MODULE_LICENSE("GPL"); |
