[ALSA] at73c213: monaural support

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@mba.ocn.ne.jp>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

1 files changed, 15 insertions, 4 deletions

diff --git a/sound/spi/at73c213.c b/sound/spi/at73c213.c
index c1b0b9dff819..1355fe0c6674 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,
@@ -229,6 +229,14 @@ 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));
 }
@@ -250,10 +258,12 @@ 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;
 }
@@ -376,7 +386,8 @@ 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;
         }