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iio: core: Introduce iio_push_to_buffers_with_ts_unaligned()

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Whilst it is almost always possible to arrange for scan data to be
read directly into a buffer that is suitable for passing to
iio_push_to_buffers_with_timestamp(), there are a few places where
leading data needs to be skipped over.

For these cases introduce a function that will allocate an appropriate
sized and aligned bounce buffer (if not already allocated) and copy
the unaligned data into that before calling
iio_push_to_buffers_with_timestamp() on the bounce buffer.
We tie the lifespace of this buffer to that of the iio_dev.dev
which should ensure no memory leaks occur.

Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Reviewed-by: Nuno Sá <nuno.sa@analog.com>
Link: https://lore.kernel.org/r/20210613151039.569883-2-jic23@kernel.org
This commit is contained in:
Jonathan Cameron 2021-06-13 16:10:36 +01:00
parent b18831cc99
commit 95ec3fdf2b
3 changed files with 54 additions and 0 deletions
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4
include/linux/iio/buffer.h
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@ -38,6 +38,10 @@ static inline int iio_push_to_buffers_with_timestamp(struct iio_dev *indio_dev,
return iio_push_to_buffers(indio_dev, data);
}
int iio_push_to_buffers_with_ts_unaligned(struct iio_dev *indio_dev,
const void *data, size_t data_sz,
int64_t timestamp);
bool iio_validate_scan_mask_onehot(struct iio_dev *indio_dev,
const unsigned long *mask);