[PATCH] dmaengine: add helper function for slave_single
From: Vinod Koul <hidden>
Date: 2011-07-25 14:27:52
Subsystem:
dma generic offload engine subsystem, the rest · Maintainers:
Vinod Koul, Linus Torvalds
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 Russel King Signed-off-by: Vinod Koul <redacted> --- include/linux/dmaengine.h | 10 ++++++++++ 1 files changed, 10 insertions(+), 0 deletions(-)
diff --git a/include/linux/dmaengine.h b/include/linux/dmaengine.h
index eee7add..97dafc6 100644
--- a/include/linux/dmaengine.h
+++ b/include/linux/dmaengine.h@@ -517,6 +517,16 @@ 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);
--
1.7.0.4
--
~Vinod Koul
Intel Corp.