dmaengine: Add helper function to convert direction value to text

dmaengine_get_direction_text() can be useful when the direction is printed
out. The text is easier to comprehend than the number.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Link: https://lore.kernel.org/r/20191223110458.30766-7-peter.ujfalusi@ti.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>

diff --git a/include/linux/dmaengine.h b/include/linux/dmaengine.h
index b44b9c6..62225d4 100644 (file)
--- a/include/linux/dmaengine.h
+++ b/include/linux/dmaengine.h
@@ -1545,4 +1545,23 @@ static inline struct dma_chan
 
        return __dma_request_channel(mask, fn, fn_param, NULL);
 }
+
+static inline char *
+dmaengine_get_direction_text(enum dma_transfer_direction dir)
+{
+       switch (dir) {
+       case DMA_DEV_TO_MEM:
+               return "DEV_TO_MEM";
+       case DMA_MEM_TO_DEV:
+               return "MEM_TO_DEV";
+       case DMA_MEM_TO_MEM:
+               return "MEM_TO_MEM";
+       case DMA_DEV_TO_DEV:
+               return "DEV_TO_DEV";
+       default:
+               break;
+       }
+
+       return "invalid";
+}
 #endif /* DMAENGINE_H */