ASoC: fsi: data push/pop calculation part was divided

Next transfer data size of "push" and "pop" had calculated on shared function.
But it was not readable code.
This patch divided it into for push, and for pop.

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

sound/soc/sh/fsi.c

@@ -747,17 +747,14 @@ static void fsi_fifo_init(struct fsi_priv *fsi,
 	}
 }
 
-static int fsi_fifo_data_ctrl(struct fsi_priv *fsi, int stream)
+static int fsi_fifo_data_ctrl(struct fsi_priv *fsi, struct fsi_stream *io,
+			      void (*run16)(struct fsi_priv *fsi, int size),
+			      void (*run32)(struct fsi_priv *fsi, int size),
+			      int samples)
 {
 	struct snd_pcm_runtime *runtime;
-	struct snd_pcm_substream *substream = NULL;
-	int is_play = fsi_stream_is_play(stream);
-	struct fsi_stream *io = fsi_stream_get(fsi, is_play);
-	int sample_residues;
-	int samples;
-	int samples_max;
+	struct snd_pcm_substream *substream;
 	int over_period;
-	void (*fn)(struct fsi_priv *fsi, int size);
 
 	if (!fsi			||
 	    !io->substream		||
@@ -781,57 +778,17 @@ static int fsi_fifo_data_ctrl(struct fsi_priv *fsi, int stream)
 			io->buff_sample_pos = 0;
 	}
 
-	/* get number of residue samples */
-	sample_residues = io->buff_sample_capa - io->buff_sample_pos;
-
-	if (is_play) {
-		/*
-		 * for play-back
-		 *
-		 * samples_max	: number of FSI fifo free samples space
-		 * samples	: number of ALSA residue samples
-		 */
-		samples_max  = io->fifo_sample_capa;
-		samples_max -= fsi_get_current_fifo_samples(fsi, is_play);
-
-		samples = sample_residues;
-
-		switch (io->sample_width) {
-		case 2:
-			fn = fsi_dma_soft_push16;
-			break;
-		case 4:
-			fn = fsi_dma_soft_push32;
-			break;
-		default:
-			return -EINVAL;
-		}
-	} else {
-		/*
-		 * for capture
-		 *
-		 * samples_max	: number of ALSA free samples space
-		 * samples	: number of samples in FSI fifo
-		 */
-		samples_max = sample_residues;
-		samples     = fsi_get_current_fifo_samples(fsi, is_play);
-
-		switch (io->sample_width) {
-		case 2:
-			fn = fsi_dma_soft_pop16;
-			break;
-		case 4:
-			fn = fsi_dma_soft_pop32;
-			break;
-		default:
-			return -EINVAL;
-		}
+	switch (io->sample_width) {
+	case 2:
+		run16(fsi, samples);
+		break;
+	case 4:
+		run32(fsi, samples);
+		break;
+	default:
+		return -EINVAL;
 	}
 
-	samples = min(samples, samples_max);
-
-	fn(fsi, samples);
-
 	/* update buff_sample_pos */
 	io->buff_sample_pos += samples;
 
@@ -843,12 +800,41 @@ static int fsi_fifo_data_ctrl(struct fsi_priv *fsi, int stream)
 
 static int fsi_data_pop(struct fsi_priv *fsi)
 {
-	return fsi_fifo_data_ctrl(fsi, SNDRV_PCM_STREAM_CAPTURE);
+	int is_play = fsi_stream_is_play(SNDRV_PCM_STREAM_CAPTURE);
+	int sample_residues;	/* samples in FSI fifo */
+	int sample_space;	/* ALSA free samples space */
+	int samples;
+	struct fsi_stream *io = fsi_stream_get(fsi, is_play);
+
+	sample_residues	= fsi_get_current_fifo_samples(fsi, is_play);
+	sample_space	= io->buff_sample_capa - io->buff_sample_pos;
+
+	samples = min(sample_residues, sample_space);
+
+	return fsi_fifo_data_ctrl(fsi, io,
+				  fsi_dma_soft_pop16,
+				  fsi_dma_soft_pop32,
+				  samples);
 }
 
 static int fsi_data_push(struct fsi_priv *fsi)
 {
-	return fsi_fifo_data_ctrl(fsi, SNDRV_PCM_STREAM_PLAYBACK);
+	int is_play = fsi_stream_is_play(SNDRV_PCM_STREAM_PLAYBACK);
+	int sample_residues;	/* ALSA residue samples */
+	int sample_space;	/* FSI fifo free samples space */
+	int samples;
+	struct fsi_stream *io = fsi_stream_get(fsi, is_play);
+
+	sample_residues	= io->buff_sample_capa - io->buff_sample_pos;
+	sample_space	= io->fifo_sample_capa -
+		fsi_get_current_fifo_samples(fsi, is_play);
+
+	samples = min(sample_residues, sample_space);
+
+	return fsi_fifo_data_ctrl(fsi, io,
+				  fsi_dma_soft_push16,
+				  fsi_dma_soft_push32,
+				  samples);
 }
 
 static irqreturn_t fsi_interrupt(int irq, void *data)