From e85ad9182c962bb095beb435e98fde612a4ef88d Mon Sep 17 00:00:00 2001
From: Joel Fernandes <joelf@ti.com>
Date: Wed, 3 Jul 2013 17:29:44 -0500
Subject: [PATCH 11/13] sound: soc: soc-dmaengine-pcm: Add support for new
 DMAEngine request API

Formerly these resources were coming HWMOD on OMAP-like SoCs. With the
impending removal of HWMOD data, drivers are being converted to use the
"of-dma" method of requesting DMA channels which from DT and can be obtained
using the dma_request_slave_channel API. Add support to the soc-dmaengine-pcm
helpers so that we can fetch and open channels using this method.

Signed-off-by: Joel Fernandes <joelf@ti.com>
---
 sound/core/pcm_dmaengine.c | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/sound/core/pcm_dmaengine.c b/sound/core/pcm_dmaengine.c
index aa924d9..461fe4f 100644
--- a/sound/core/pcm_dmaengine.c
+++ b/sound/core/pcm_dmaengine.c
@@ -276,6 +276,16 @@ struct dma_chan *snd_dmaengine_pcm_request_channel(dma_filter_fn filter_fn,
 }
 EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_request_channel);
 
+struct dma_chan *snd_dmaengine_pcm_request_slave_channel(
+	struct snd_pcm_substream *substream, char *name)
+{
+	struct snd_soc_pcm_runtime *rtd = substream->private_data;
+	struct device *dev = snd_soc_dai_get_drvdata(rtd->cpu_dai);
+
+	return dma_request_slave_channel(dev, name);
+}
+EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_request_slave_channel);
+
 /**
  * snd_dmaengine_pcm_open - Open a dmaengine based PCM substream
  * @substream: PCM substream
@@ -334,6 +344,18 @@ int snd_dmaengine_pcm_open_request_chan(struct snd_pcm_substream *substream,
 }
 EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_open_request_chan);
 
+int snd_dmaengine_pcm_open_request_slave_chan(struct snd_pcm_substream *substream, char *name)
+{
+	if(substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
+		return snd_dmaengine_pcm_open(substream,
+			    snd_dmaengine_pcm_request_slave_channel(substream, "tx"));
+	} else {
+		return snd_dmaengine_pcm_open(substream,
+			    snd_dmaengine_pcm_request_slave_channel(substream, "rx"));
+	}
+}
+EXPORT_SYMBOL_GPL(snd_dmaengine_pcm_open_request_slave_chan);
+
 /**
  * snd_dmaengine_pcm_close - Close a dmaengine based PCM substream
  * @substream: PCM substream
-- 
1.8.2.1