[alsa-devel] [PATCH] ASoC:nau8825: automatic LRCK and BCLK divide in master mode

[John Hsu]

Provide the automatic configurable LRC and BCLK divide. The bit clock rate
can be chosen by userspace. The driver will make configurations of LRCK
and BCLK automatically when playback or capture in master mode.

Signed-off-by: John Hsu <KCHSU0 at nuvoton.com>
---
 sound/soc/codecs/nau8825.c | 56 ++++++++++++++++++++++++++++++++++++++++++++++
 sound/soc/codecs/nau8825.h |  1 +
 2 files changed, 57 insertions(+)

diff --git a/sound/soc/codecs/nau8825.c b/sound/soc/codecs/nau8825.c
index 4576f98..502443b 100644
--- a/sound/soc/codecs/nau8825.c
+++ b/sound/soc/codecs/nau8825.c
@@ -1007,6 +1007,42 @@ static int nau8825_biq_coeff_put(struct snd_kcontrol *kcontrol,
        return 0;
 }

+int nau8825_bclk_rate_get_enum(struct snd_kcontrol *kcontrol,
+       struct snd_ctl_elem_value *ucontrol)
+{
+       struct soc_enum *e = (struct soc_enum *)kcontrol->private_value;
+       struct snd_soc_codec *codec = snd_soc_kcontrol_codec(kcontrol);
+       struct nau8825 *nau8825 = snd_soc_codec_get_drvdata(codec);
+       unsigned int item;
+
+       item = snd_soc_enum_val_to_item(e, nau8825->bclk_rate);
+       ucontrol->value.enumerated.item[0] = item;
+
+       return 0;
+}
+
+int nau8825_bclk_rate_put_enum(struct snd_kcontrol *kcontrol,
+       struct snd_ctl_elem_value *ucontrol)
+{
+       struct soc_enum *e = (struct soc_enum *)kcontrol->private_value;
+       struct snd_soc_codec *codec = snd_soc_kcontrol_codec(kcontrol);
+       struct nau8825 *nau8825 = snd_soc_codec_get_drvdata(codec);
+       unsigned int *item = ucontrol->value.enumerated.item;
+       unsigned int val;
+       bool change = false;
+
+       if (item[0] >= e->items)
+               return -EINVAL;
+
+       val = snd_soc_enum_item_to_val(e, item[0]);
+       if (val != nau8825->bclk_rate) {
+               nau8825->bclk_rate = val;
+               change = true;
+       }
+
+       return change;
+}
+
 static const char * const nau8825_biq_path[] = {
        "ADC", "DAC"
 };
@@ -1031,6 +1067,13 @@ static const struct soc_enum nau8825_dac_oversampl_enum =
        SOC_ENUM_SINGLE(NAU8825_REG_DAC_CTRL1, NAU8825_DAC_OVERSAMPLE_SFT,
                ARRAY_SIZE(nau8825_dac_oversampl), nau8825_dac_oversampl);

+static const char * const nau8825_bclk_rate[] = {
+       "128fs", "64fs", "32fs" };
+
+static const struct soc_enum nau8825_bclk_rate_enum =
+       SOC_ENUM_SINGLE(SND_SOC_NOPM, 0,
+               ARRAY_SIZE(nau8825_bclk_rate), nau8825_bclk_rate);
+
 static const DECLARE_TLV_DB_MINMAX_MUTE(adc_vol_tlv, -10300, 2400);
 static const DECLARE_TLV_DB_MINMAX_MUTE(sidetone_vol_tlv, -4200, 0);
 static const DECLARE_TLV_DB_MINMAX(dac_vol_tlv, -5400, 0);
@@ -1055,6 +1098,9 @@ static const struct snd_kcontrol_new nau8825_controls[] = {
        SOC_ENUM("BIQ Path Select", nau8825_biq_path_enum),
        SND_SOC_BYTES_EXT("BIQ Coefficients", 20,
                  nau8825_biq_coeff_get, nau8825_biq_coeff_put),
+
+       SOC_ENUM_EXT("BCLK rate", nau8825_bclk_rate_enum,
+               nau8825_bclk_rate_get_enum, nau8825_bclk_rate_put_enum),
 };

 /* DAC Mux 0x33[9] and 0x34[9] */
@@ -1343,6 +1389,14 @@ static int nau8825_set_dai_fmt(struct snd_soc_dai *codec_dai, unsigned int fmt)
        regmap_update_bits(nau8825->regmap, NAU8825_REG_I2S_PCM_CTRL2,
                NAU8825_I2S_MS_MASK, ctrl2_val);

+       if (ctrl2_val & NAU8825_I2S_MS_MASTER) {
+               regmap_update_bits(nau8825->regmap, NAU8825_REG_I2S_PCM_CTRL2,
+                       NAU8825_I2S_BLK_DIV_MASK, nau8825->bclk_rate);
+               regmap_update_bits(nau8825->regmap, NAU8825_REG_I2S_PCM_CTRL2,
+                       NAU8825_I2S_LRC_DIV_MASK,
+                       (nau8825->bclk_rate + 1) << NAU8825_I2S_LRC_DIV_SFT);
+       }
+
        /* Release the semaphone. */
        nau8825_sema_release(nau8825);

@@ -2497,6 +2551,8 @@ static int nau8825_i2c_probe(struct i2c_client *i2c,
                return PTR_ERR(nau8825->regmap);
        nau8825->dev = dev;
        nau8825->irq = i2c->irq;
+       /* assign 32fs as default bit clock rate */
+       nau8825->bclk_rate = 2;
        /* Initiate parameters, semaphone and work queue which are needed in
         * cross talk suppression measurment function.
         */
diff --git a/sound/soc/codecs/nau8825.h b/sound/soc/codecs/nau8825.h
index 514fd13..5f2ed8d 100644
--- a/sound/soc/codecs/nau8825.h
+++ b/sound/soc/codecs/nau8825.h
@@ -476,6 +476,7 @@ struct nau8825 {
        int xtalk_event_mask;
        bool xtalk_protect;
        int imp_rms[NAU8825_XTALK_IMM];
+       int bclk_rate;
 };

 int nau8825_enable_jack_detect(struct snd_soc_codec *codec,
--
2.6.4



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