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Message-Id: <20080307.190234.55730878.nemoto@toshiba-tops.co.jp>
Date: Fri, 07 Mar 2008 19:02:34 +0900 (JST)
From: Atsushi Nemoto <anemo@....ocn.ne.jp>
To: linux-kernel@...r.kernel.org
Cc: Hans-Christian Egtvedt <hcegtvedt@...el.com>,
Haavard Skinnemoen <hskinnemoen@...el.com>,
Andrew Victor <avictor.za@...il.com>
Subject: [PATCH] at73c213: Monaural support
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@....ocn.ne.jp>
---
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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