ASoC: Support WM8994 mono AIF configurations

The WM8994 supports mono signals - enable this in the driver. With DSP
mode an automatic data channel selector is available, activate this
when in mono mode.

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

1 files changed, 15 insertions, 6 deletions

diff --git a/sound/soc/codecs/wm8994.c b/sound/soc/codecs/wm8994.c
index b37e95c4e7c7..997fd178563f 100644
--- a/sound/soc/codecs/wm8994.c
+++ b/sound/soc/codecs/wm8994.c
@@ -2099,10 +2099,12 @@ static int wm8994_hw_params(struct snd_pcm_substream *substream,
         struct wm8994 *control = codec->control_data;
         struct wm8994_priv *wm8994 = snd_soc_codec_get_drvdata(codec);
         int aif1_reg;
+        int aif2_reg;
         int bclk_reg;
         int lrclk_reg;
         int rate_reg;
         int aif1 = 0;
+        int aif2 = 0;
         int bclk = 0;
         int lrclk = 0;
         int rate_val = 0;
@@ -2113,6 +2115,7 @@ static int wm8994_hw_params(struct snd_pcm_substream *substream,
         switch (dai->id) {
         case 1:
                 aif1_reg = WM8994_AIF1_CONTROL_1;
+                aif2_reg = WM8994_AIF1_CONTROL_2;
                 bclk_reg = WM8994_AIF1_BCLK;
                 rate_reg = WM8994_AIF1_RATE;
                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK ||
@@ -2125,6 +2128,7 @@ static int wm8994_hw_params(struct snd_pcm_substream *substream,
                 break;
         case 2:
                 aif1_reg = WM8994_AIF2_CONTROL_1;
+                aif2_reg = WM8994_AIF2_CONTROL_2;
                 bclk_reg = WM8994_AIF2_BCLK;
                 rate_reg = WM8994_AIF2_RATE;
                 if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK ||
@@ -2180,6 +2184,10 @@ static int wm8994_hw_params(struct snd_pcm_substream *substream,
         dev_dbg(dai->dev, "AIF%dCLK is %dHz, target BCLK %dHz\n",
                 dai->id, wm8994->aifclk[id], bclk_rate);
 
+        if (params_channels(params) == 1 &&
+            (snd_soc_read(codec, aif1_reg) & 0x18) == 0x18)
+                aif2 |= WM8994_AIF1_MONO;
+
         if (wm8994->aifclk[id] == 0) {
                 dev_err(dai->dev, "AIF%dCLK not configured\n", dai->id);
                 return -EINVAL;
@@ -2223,6 +2231,7 @@ static int wm8994_hw_params(struct snd_pcm_substream *substream,
                 lrclk, bclk_rate / lrclk);
 
         snd_soc_update_bits(codec, aif1_reg, WM8994_AIF1_WL_MASK, aif1);
+        snd_soc_update_bits(codec, aif2_reg, WM8994_AIF1_MONO, aif2);
         snd_soc_update_bits(codec, bclk_reg, WM8994_AIF1_BCLK_DIV_MASK, bclk);
         snd_soc_update_bits(codec, lrclk_reg, WM8994_AIF1DAC_RATE_MASK,
                             lrclk);
@@ -2378,14 +2387,14 @@ static struct snd_soc_dai_driver wm8994_dai[] = {
                 .id = 1,
                 .playback = {
                         .stream_name = "AIF1 Playback",
-                        .channels_min = 2,
+                        .channels_min = 1,
                         .channels_max = 2,
                         .rates = WM8994_RATES,
                         .formats = WM8994_FORMATS,
                 },
                 .capture = {
                         .stream_name = "AIF1 Capture",
-                        .channels_min = 2,
+                        .channels_min = 1,
                         .channels_max = 2,
                         .rates = WM8994_RATES,
                         .formats = WM8994_FORMATS,
@@ -2397,14 +2406,14 @@ static struct snd_soc_dai_driver wm8994_dai[] = {
                 .id = 2,
                 .playback = {
                         .stream_name = "AIF2 Playback",
-                        .channels_min = 2,
+                        .channels_min = 1,
                         .channels_max = 2,
                         .rates = WM8994_RATES,
                         .formats = WM8994_FORMATS,
                 },
                 .capture = {
                         .stream_name = "AIF2 Capture",
-                        .channels_min = 2,
+                        .channels_min = 1,
                         .channels_max = 2,
                         .rates = WM8994_RATES,
                         .formats = WM8994_FORMATS,
@@ -2416,14 +2425,14 @@ static struct snd_soc_dai_driver wm8994_dai[] = {
                 .id = 3,
                 .playback = {
                         .stream_name = "AIF3 Playback",
-                        .channels_min = 2,
+                        .channels_min = 1,
                         .channels_max = 2,
                         .rates = WM8994_RATES,
                         .formats = WM8994_FORMATS,
                 },
                 .capture = {
                         .stream_name = "AIF3 Capture",
-                        .channels_min = 2,
+                        .channels_min = 1,
                         .channels_max = 2,
                         .rates = WM8994_RATES,
                         .formats = WM8994_FORMATS,