[PATCH] at73c213: Monaural support

[Atsushi Nemoto]

This patch add support for monaural playback to at73c213 driver.  The
sound will be apear on L-channel.  Tested on AT91SAM9260-EK.

Signed-off-by: Atsushi Nemoto <anemo@xxxxxxxxxxxxx>
---
diff --git a/sound/spi/at73c213.c b/sound/spi/at73c213.c
index 89d6e9c..a7839cc 100644
--- a/sound/spi/at73c213.c
+++ b/sound/spi/at73c213.c
@@ -118,7 +118,7 @@ static struct snd_pcm_hardware snd_at73c213_playback_hw = {
 	.rates		= SNDRV_PCM_RATE_CONTINUOUS,
 	.rate_min	= 8000,  /* Replaced by chip->bitrate later. */
 	.rate_max	= 50000, /* Replaced by chip->bitrate later. */
-	.channels_min	= 2,
+	.channels_min	= 1,
 	.channels_max	= 2,
 	.buffer_bytes_max = 64 * 1024 - 1,
 	.period_bytes_min = 512,
@@ -228,6 +228,14 @@ static int snd_at73c213_pcm_close(struct snd_pcm_substream *substream)
 static int snd_at73c213_pcm_hw_params(struct snd_pcm_substream *substream,
 				 struct snd_pcm_hw_params *hw_params)
 {
+	struct snd_at73c213 *chip = snd_pcm_substream_chip(substream);
+	int channels = params_channels(hw_params);
+	int val;
+
+	val = ssc_readl(chip->ssc->regs, TFMR);
+	val = SSC_BFINS(TFMR_DATNB, channels - 1, val);
+	ssc_writel(chip->ssc->regs, TFMR, val);
+
 	return snd_pcm_lib_malloc_pages(substream,
 					params_buffer_bytes(hw_params));
 }
@@ -249,10 +257,12 @@ static int snd_at73c213_pcm_prepare(struct snd_pcm_substream *substream)
 
 	ssc_writel(chip->ssc->regs, PDC_TPR,
 			(long)runtime->dma_addr);
-	ssc_writel(chip->ssc->regs, PDC_TCR, runtime->period_size * 2);
+	ssc_writel(chip->ssc->regs, PDC_TCR,
+			runtime->period_size * runtime->channels);
 	ssc_writel(chip->ssc->regs, PDC_TNPR,
 			(long)runtime->dma_addr + block_size);
-	ssc_writel(chip->ssc->regs, PDC_TNCR, runtime->period_size * 2);
+	ssc_writel(chip->ssc->regs, PDC_TNCR,
+			runtime->period_size * runtime->channels);
 
 	return 0;
 }
@@ -375,7 +385,8 @@ static irqreturn_t snd_at73c213_interrupt(int irq, void *dev_id)
 
 		ssc_writel(chip->ssc->regs, PDC_TNPR,
 				(long)runtime->dma_addr + offset);
-		ssc_writel(chip->ssc->regs, PDC_TNCR, runtime->period_size * 2);
+		ssc_writel(chip->ssc->regs, PDC_TNCR,
+				runtime->period_size * runtime->channels);
 		retval = IRQ_HANDLED;
 	}
 
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