[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>
diff --git a/sound/spi/at73c213.c b/sound/spi/at73c213.c
index c1b0b9d..1355fe0 100644
--- a/sound/spi/at73c213.c
+++ b/sound/spi/at73c213.c
@@ -118,7 +118,7 @@
.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_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 @@
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 @@
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;
}