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Diffstat (limited to 'sound/soc/codecs/wm8974.c')
-rw-r--r--sound/soc/codecs/wm8974.c93
1 files changed, 93 insertions, 0 deletions
diff --git a/sound/soc/codecs/wm8974.c b/sound/soc/codecs/wm8974.c
index c284c7b6d..dc8c3b1eb 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);