dmaengine: add helper function for slave_single (90b44f8f) · Commits · 戴 / test

For clients which require a single slave transfer and dont want to be bothered about the scatterlist api, this helper gives simple API for this transfer and creates single scatterlist for DMA API Idea from Russell King Signed-off-by:

Vinod Koul <vinod.koul@intel.com>

include/linux/dmaengine.h

+11 −0

Original line number	Diff line number	Diff line
		@@ -24,6 +24,7 @@
		#include <linux/device.h>
		#include <linux/uio.h>
		#include <linux/dma-direction.h>
		#include <linux/scatterlist.h>

		struct scatterlist;

		@@ -519,6 +520,16 @@ static inline int dmaengine_slave_config(struct dma_chan *chan,
		(unsigned long)config);
		}

		static inline struct dma_async_tx_descriptor *dmaengine_prep_slave_single(
		struct dma_chan chan, void buf, size_t len,
		enum dma_data_direction dir, unsigned long flags)
		{
		struct scatterlist sg;
		sg_init_one(&sg, buf, len);

		return chan->device->device_prep_slave_sg(chan, &sg, 1, dir, flags);
		}

		static inline int dmaengine_terminate_all(struct dma_chan *chan)
		{
		return dmaengine_device_control(chan, DMA_TERMINATE_ALL, 0);

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