ASoC: Automatically manage ALC coefficients for WM8960

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Acked-by: Liam Girdwood <lrg@slimlogic.co.uk>

1 files changed, 22 insertions, 0 deletions

diff --git a/sound/soc/codecs/wm8960.c b/sound/soc/codecs/wm8960.c
index 743d9a708a22..3c6ee61f6c95 100644
--- a/sound/soc/codecs/wm8960.c
+++ b/sound/soc/codecs/wm8960.c
@@ -487,6 +487,21 @@ static int wm8960_set_dai_fmt(struct snd_soc_dai *codec_dai,
         return 0;
 }
 
+static struct {
+        int rate;
+        unsigned int val;
+} alc_rates[] = {
+        { 48000, 0 },
+        { 44100, 0 },
+        { 32000, 1 },
+        { 22050, 2 },
+        { 24000, 2 },
+        { 16000, 3 },
+        { 11250, 4 },
+        { 12000, 4 },
+        {  8000, 5 },
+};
+
 static int wm8960_hw_params(struct snd_pcm_substream *substream,
                             struct snd_pcm_hw_params *params,
                             struct snd_soc_dai *dai)
@@ -496,6 +511,7 @@ static int wm8960_hw_params(struct snd_pcm_substream *substream,
         struct snd_soc_codec *codec = socdev->card->codec;
         struct wm8960_priv *wm8960 = snd_soc_codec_get_drvdata(codec);
         u16 iface = snd_soc_read(codec, WM8960_IFACE1) & 0xfff3;
+        int i;
 
         /* bit size */
         switch (params_format(params)) {
@@ -513,6 +529,12 @@ static int wm8960_hw_params(struct snd_pcm_substream *substream,
         if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
                 wm8960->playback_fs = params_rate(params);
                 wm8960_set_deemph(codec);
+        } else {
+                for (i = 0; i < ARRAY_SIZE(alc_rates); i++)
+                        if (alc_rates[i].rate == params_rate(params))
+                                snd_soc_update_bits(codec,
+                                                    WM8960_ADDCTL3, 0x7,
+                                                    alc_rates[i].val);
         }
 
         /* set iface */