[v8,06/18] dmaengine: Add helper function to convert direction value to text

Commit Message

Peter Ujfalusi Dec. 23, 2019, 11:04 a.m. UTC

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 <[e-mail]>
---
 include/linux/dmaengine.h | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

Patch

diff --git a/include/linux/dmaengine.h b/include/linux/dmaengine.h
index 7f9a7150a632..9852ba7399db 100644
--- a/include/linux/dmaengine.h
+++ b/include/linux/dmaengine.h
@@ -1537,4 +1537,23 @@  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 */