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[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>
This commit is contained in:
Atsushi Nemoto 2008-03-08 11:08:32 +01:00 committed by Takashi Iwai
parent c67582b195
commit 4a295ca474
1 changed files with 15 additions and 4 deletions
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19
sound/spi/at73c213.c
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@ -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;
}