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iio: Add a DMAengine framework based buffer

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Add a generic fully device independent DMA buffer implementation that uses
the DMAegnine framework to perform the DMA transfers. This can be used by
converter drivers that whish to provide a DMA buffer for converters that
are connected to a DMA core that implements the DMAengine API.

Apart from allocating the buffer using iio_dmaengine_buffer_alloc() and
freeing it using iio_dmaengine_buffer_free() no additional converter driver
specific code is required when using this DMA buffer implementation.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
This commit is contained in:
Lars-Peter Clausen
2015-10-13 18:10:29 +02:00
committed by Jonathan Cameron
parent 670b19ae9b
commit 2d6ca60f32
4 changed files with 243 additions and 0 deletions
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drivers/iio/buffer/Kconfig
+11
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@@ -18,6 +18,17 @@ config IIO_BUFFER_DMA
Should be selected by drivers that want to use the generic DMA buffer
infrastructure.
config IIO_BUFFER_DMAENGINE
tristate
select IIO_BUFFER_DMA
help
Provides a bonding of the generic IIO DMA buffer infrastructure with the
DMAengine framework. This can be used by converter drivers with a DMA port
connected to an external DMA controller which is supported by the
DMAengine framework.
Should be selected by drivers that want to use this functionality.
config IIO_KFIFO_BUF
tristate "Industrial I/O buffering based on kfifo"
help