diff options
| -rw-r--r-- | sound/soc/codecs/wm8974.c | 93 |
1 files changed, 93 insertions, 0 deletions
diff --git a/sound/soc/codecs/wm8974.c b/sound/soc/codecs/wm8974.c index c284c7b6db8b..dc8c3b1ebb6f 100644 --- a/sound/soc/codecs/wm8974.c +++ b/sound/soc/codecs/wm8974.c @@ -28,6 +28,11 @@ #include "wm8974.h" +struct wm8974_priv { + unsigned int mclk; + unsigned int fs; +}; + static const struct reg_default wm8974_reg_defaults[] = { { 0, 0x0000 }, { 1, 0x0000 }, { 2, 0x0000 }, { 3, 0x0000 }, { 4, 0x0050 }, { 5, 0x0000 }, { 6, 0x0140 }, { 7, 0x0000 }, @@ -379,6 +384,79 @@ static int wm8974_set_dai_clkdiv(struct snd_soc_dai *codec_dai, return 0; } +static unsigned int wm8974_get_mclkdiv(unsigned int f_in, unsigned int f_out, + int *mclkdiv) +{ + unsigned int ratio = 2 * f_in / f_out; + + if (ratio <= 2) { + *mclkdiv = WM8974_MCLKDIV_1; + ratio = 2; + } else if (ratio == 3) { + *mclkdiv = WM8974_MCLKDIV_1_5; + } else if (ratio == 4) { + *mclkdiv = WM8974_MCLKDIV_2; + } else if (ratio <= 6) { + *mclkdiv = WM8974_MCLKDIV_3; + ratio = 6; + } else if (ratio <= 8) { + *mclkdiv = WM8974_MCLKDIV_4; + ratio = 8; + } else if (ratio <= 12) { + *mclkdiv = WM8974_MCLKDIV_6; + ratio = 12; + } else if (ratio <= 16) { + *mclkdiv = WM8974_MCLKDIV_8; + ratio = 16; + } else { + *mclkdiv = WM8974_MCLKDIV_12; + ratio = 24; + } + + return f_out * ratio / 2; +} + +static int wm8974_update_clocks(struct snd_soc_dai *dai) +{ + struct snd_soc_codec *codec = dai->codec; + struct wm8974_priv *priv = snd_soc_codec_get_drvdata(codec); + unsigned int fs256; + unsigned int fpll = 0; + unsigned int f; + int mclkdiv; + + if (!priv->mclk || !priv->fs) + return 0; + + fs256 = 256 * priv->fs; + + f = wm8974_get_mclkdiv(priv->mclk, fs256, &mclkdiv); + + if (f != priv->mclk) { + /* The PLL performs best around 90MHz */ + fpll = wm8974_get_mclkdiv(22500000, fs256, &mclkdiv); + } + + wm8974_set_dai_pll(dai, 0, 0, priv->mclk, fpll); + wm8974_set_dai_clkdiv(dai, WM8974_MCLKDIV, mclkdiv); + + return 0; +} + +static int wm8974_set_dai_sysclk(struct snd_soc_dai *dai, int clk_id, + unsigned int freq, int dir) +{ + struct snd_soc_codec *codec = dai->codec; + struct wm8974_priv *priv = snd_soc_codec_get_drvdata(codec); + + if (dir != SND_SOC_CLOCK_IN) + return -EINVAL; + + priv->mclk = freq; + + return wm8974_update_clocks(dai); +} + static int wm8974_set_dai_fmt(struct snd_soc_dai *codec_dai, unsigned int fmt) { @@ -441,8 +519,15 @@ static int wm8974_pcm_hw_params(struct snd_pcm_substream *substream, struct snd_soc_dai *dai) { struct snd_soc_codec *codec = dai->codec; + struct wm8974_priv *priv = snd_soc_codec_get_drvdata(codec); u16 iface = snd_soc_read(codec, WM8974_IFACE) & 0x19f; u16 adn = snd_soc_read(codec, WM8974_ADD) & 0x1f1; + int err; + + priv->fs = params_rate(params); + err = wm8974_update_clocks(dai); + if (err) + return err; /* bit size */ switch (params_width(params)) { @@ -547,6 +632,7 @@ static const struct snd_soc_dai_ops wm8974_ops = { .set_fmt = wm8974_set_dai_fmt, .set_clkdiv = wm8974_set_dai_clkdiv, .set_pll = wm8974_set_dai_pll, + .set_sysclk = wm8974_set_dai_sysclk, }; static struct snd_soc_dai_driver wm8974_dai = { @@ -606,9 +692,16 @@ static struct snd_soc_codec_driver soc_codec_dev_wm8974 = { static int wm8974_i2c_probe(struct i2c_client *i2c, const struct i2c_device_id *id) { + struct wm8974_priv *priv; struct regmap *regmap; int ret; + priv = devm_kzalloc(&i2c->dev, sizeof(*priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + + i2c_set_clientdata(i2c, priv); + regmap = devm_regmap_init_i2c(i2c, &wm8974_regmap); if (IS_ERR(regmap)) return PTR_ERR(regmap); |