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>

diff --git a/sound/soc/codecs/wm8994.c b/sound/soc/codecs/wm8994.c
index b37e95c4e7c7491cede2c2e296aa87f88adc31c7..997fd178563f2f0af26eeaf031402e56f47d88a7 100644 (file)
--- 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,