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ASoC: Implement TDM configuration for WM8993

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Note that the number of slots used internally is specified in terms
of stereo slots while the external API works with mono slots.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
This commit is contained in:
Mark Brown 2009-08-17 18:52:47 +01:00
parent 0182dcc52c
commit d3c9e9a139
1 changed files with 81 additions and 18 deletions
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63
sound/soc/codecs/wm8993.c
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@ -218,6 +218,8 @@ struct wm8993_priv {
struct snd_soc_codec codec;
int master;
int sysclk_source;
int tdm_slots;
int tdm_width;
unsigned int mclk_rate;
unsigned int sysclk_rate;
unsigned int fs;
@ -1107,6 +1109,11 @@ static int wm8993_hw_params(struct snd_pcm_substream *substream,
/* What BCLK do we need? */
wm8993->fs = params_rate(params);
wm8993->bclk = 2 * wm8993->fs;
if (wm8993->tdm_slots) {
dev_dbg(codec->dev, "Configuring for %d %d bit TDM slots\n",
wm8993->tdm_slots, wm8993->tdm_width);
wm8993->bclk *= wm8993->tdm_width * wm8993->tdm_slots;
} else {
switch (params_format(params)) {
case SNDRV_PCM_FORMAT_S16_LE:
wm8993->bclk *= 16;
@ -1126,6 +1133,7 @@ static int wm8993_hw_params(struct snd_pcm_substream *substream,
default:
return -EINVAL;
}
}
dev_dbg(codec->dev, "Target BCLK is %dHz\n", wm8993->bclk);
@ -1243,12 +1251,67 @@ static int wm8993_digital_mute(struct snd_soc_dai *codec_dai, int mute)
return 0;
}
static int wm8993_set_tdm_slot(struct snd_soc_dai *dai, unsigned int tx_mask,
unsigned int rx_mask, int slots, int slot_width)
{
struct snd_soc_codec *codec = dai->codec;
struct wm8993_priv *wm8993 = codec->private_data;
int aif1 = 0;
int aif2 = 0;
/* Don't need to validate anything if we're turning off TDM */
if (slots == 0) {
wm8993->tdm_slots = 0;
goto out;
}
/* Note that we allow configurations we can't handle ourselves -
* for example, we can generate clocks for slots 2 and up even if
* we can't use those slots ourselves.
*/
aif1 |= WM8993_AIFADC_TDM;
aif2 |= WM8993_AIFDAC_TDM;
switch (rx_mask) {
case 3:
break;
case 0xc:
aif1 |= WM8993_AIFADC_TDM_CHAN;
break;
default:
return -EINVAL;
}
switch (tx_mask) {
case 3:
break;
case 0xc:
aif2 |= WM8993_AIFDAC_TDM_CHAN;
break;
default:
return -EINVAL;
}
out:
wm8993->tdm_width = slot_width;
wm8993->tdm_slots = slots / 2;
snd_soc_update_bits(codec, WM8993_AUDIO_INTERFACE_1,
WM8993_AIFADC_TDM | WM8993_AIFADC_TDM_CHAN, aif1);
snd_soc_update_bits(codec, WM8993_AUDIO_INTERFACE_2,
WM8993_AIFDAC_TDM | WM8993_AIFDAC_TDM_CHAN, aif2);
return 0;
}
static struct snd_soc_dai_ops wm8993_ops = {
.set_sysclk = wm8993_set_sysclk,
.set_fmt = wm8993_set_dai_fmt,
.hw_params = wm8993_hw_params,
.digital_mute = wm8993_digital_mute,
.set_pll = wm8993_set_fll,
.set_tdm_slot = wm8993_set_tdm_slot,
};
#define WM8993_RATES SNDRV_PCM_RATE_8000_48000