ASoC: Intel: add drain_notify support

This patch adds the support to implement drain_notify in Intels mfld driver
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Acked-by: Liam Girdwood <liam.r.girdwood@linux.intel.com>
Signed-off-by: Mark Brown <broonie@linaro.org>

sound/soc/intel/sst-mfld-platform-compress.c

@@ -38,6 +38,15 @@ static void sst_compr_fragment_elapsed(void *arg)
 		snd_compr_fragment_elapsed(cstream);
 }
 
+static void sst_drain_notify(void *arg)
+{
+	struct snd_compr_stream *cstream = (struct snd_compr_stream *)arg;
+
+	pr_debug("drain notify by driver\n");
+	if (cstream)
+		snd_compr_drain_notify(cstream);
+}
+
 static int sst_platform_compr_open(struct snd_compr_stream *cstream)
 {
 
@@ -143,6 +152,8 @@ static int sst_platform_compr_set_params(struct snd_compr_stream *cstream,
 
 	cb.param = cstream;
 	cb.compr_cb = sst_compr_fragment_elapsed;
+	cb.drain_cb_param = cstream;
+	cb.drain_notify = sst_drain_notify;
 
 	retval = stream->compr_ops->open(&str_params, &cb);
 	if (retval < 0) {

sound/soc/intel/sst-mfld-platform.h

@@ -104,6 +104,8 @@ struct sst_stream_params {
 struct sst_compress_cb {
 	void *param;
 	void (*compr_cb)(void *param);
+	void *drain_cb_param;
+	void (*drain_notify)(void *param);
 };
 
 struct compress_sst_ops {