ASoC: TWL4030: Add 4 channel TDM support

Support for 4 channel TDM (SND_SOC_DAIFMT_DSP_A) for twl4030
codec.
The channel allocations are:
Playback:
TDM         i2s   TWL RX
Channel 1   Left  SDRL2
Channel 3   Right SDRR2
Channel 2   --    SDRL1
Channel 4   --    SDRR1

Capture:
TDM         i2s   TWL TX
Channel 1   Left  TXL1
Channel 3   Right TXR1
Channel 2   --    TXL2
Channel 4   --    TXR2

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@nokia.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

2 files changed, 61 insertions, 2 deletions

diff --git a/sound/soc/codecs/twl4030.c b/sound/soc/codecs/twl4030.c
index fdf88dfbcff9..e23c20c42f19 100644
--- a/sound/soc/codecs/twl4030.c
+++ b/sound/soc/codecs/twl4030.c
@@ -1251,6 +1251,28 @@ static void twl4030_constraints(struct twl4030_priv *twl4030,
                                 twl4030->channels);
 }
 
+/* In case of 4 channel mode, the RX1 L/R for playback and the TX2 L/R for
+ * capture has to be enabled/disabled. */
+static void twl4030_tdm_enable(struct snd_soc_codec *codec, int direction,
+                                int enable)
+{
+        u8 reg, mask;
+
+        reg = twl4030_read_reg_cache(codec, TWL4030_REG_OPTION);
+
+        if (direction == SNDRV_PCM_STREAM_PLAYBACK)
+                mask = TWL4030_ARXL1_VRX_EN | TWL4030_ARXR1_EN;
+        else
+                mask = TWL4030_ATXL2_VTXL_EN | TWL4030_ATXR2_VTXR_EN;
+
+        if (enable)
+                reg |= mask;
+        else
+                reg &= ~mask;
+
+        twl4030_write(codec, TWL4030_REG_OPTION, reg);
+}
+
 static int twl4030_startup(struct snd_pcm_substream *substream,
                            struct snd_soc_dai *dai)
 {
@@ -1267,6 +1289,15 @@ static int twl4030_startup(struct snd_pcm_substream *substream,
                 if (twl4030->configured)
                         twl4030_constraints(twl4030, twl4030->master_substream);
         } else {
+                if (!(twl4030_read_reg_cache(codec, TWL4030_REG_CODEC_MODE) &
+                        TWL4030_OPTION_1)) {
+                        /* In option2 4 channel is not supported, set the
+                         * constraint for the first stream for channels, the
+                         * second stream will 'inherit' this cosntraint */
+                        snd_pcm_hw_constraint_minmax(substream->runtime,
+                                                SNDRV_PCM_HW_PARAM_CHANNELS,
+                                                2, 2);
+                }
                 twl4030->master_substream = substream;
         }
 
@@ -1292,6 +1323,10 @@ static void twl4030_shutdown(struct snd_pcm_substream *substream,
                 twl4030->configured = 0;
          else if (!twl4030->master_substream->runtime->channels)
                 twl4030->configured = 0;
+
+         /* If the closing substream had 4 channel, do the necessary cleanup */
+        if (substream->runtime->channels == 4)
+                twl4030_tdm_enable(codec, substream->stream, 0);
 }
 
 static int twl4030_hw_params(struct snd_pcm_substream *substream,
@@ -1304,6 +1339,16 @@ static int twl4030_hw_params(struct snd_pcm_substream *substream,
         struct twl4030_priv *twl4030 = codec->private_data;
         u8 mode, old_mode, format, old_format;
 
+         /* If the substream has 4 channel, do the necessary setup */
+        if (params_channels(params) == 4) {
+                /* Safety check: are we in the correct operating mode? */
+                if ((twl4030_read_reg_cache(codec, TWL4030_REG_CODEC_MODE) &
+                        TWL4030_OPTION_1))
+                        twl4030_tdm_enable(codec, substream->stream, 1);
+                else
+                        return -EINVAL;
+        }
+
         if (twl4030->configured)
                 /* Ignoring hw_params for already configured DAI */
                 return 0;
@@ -1461,6 +1506,9 @@ static int twl4030_set_dai_fmt(struct snd_soc_dai *codec_dai,
         case SND_SOC_DAIFMT_I2S:
                 format |= TWL4030_AIF_FORMAT_CODEC;
                 break;
+        case SND_SOC_DAIFMT_DSP_A:
+                format |= TWL4030_AIF_FORMAT_TDM;
+                break;
         default:
                 return -EINVAL;
         }
@@ -1642,13 +1690,13 @@ struct snd_soc_dai twl4030_dai[] = {
         .playback = {
                 .stream_name = "Playback",
                 .channels_min = 2,
-                .channels_max = 2,
+                .channels_max = 4,
                 .rates = TWL4030_RATES | SNDRV_PCM_RATE_96000,
                 .formats = TWL4030_FORMATS,},
         .capture = {
                 .stream_name = "Capture",
                 .channels_min = 2,
-                .channels_max = 2,
+                .channels_max = 4,
                 .rates = TWL4030_RATES,
                 .formats = TWL4030_FORMATS,},
         .ops = &twl4030_dai_ops,
diff --git a/sound/soc/codecs/twl4030.h b/sound/soc/codecs/twl4030.h
index 981ec609495b..3441115136f6 100644
--- a/sound/soc/codecs/twl4030.h
+++ b/sound/soc/codecs/twl4030.h
@@ -116,6 +116,17 @@
 #define TWL4030_OPTION_1                (1 << 0)
 #define TWL4030_OPTION_2                (0 << 0)
 
+/* TWL4030_OPTION (0x02) Fields */
+
+#define TWL4030_ATXL1_EN                (1 << 0)
+#define TWL4030_ATXR1_EN                (1 << 1)
+#define TWL4030_ATXL2_VTXL_EN           (1 << 2)
+#define TWL4030_ATXR2_VTXR_EN           (1 << 3)
+#define TWL4030_ARXL1_VRX_EN            (1 << 4)
+#define TWL4030_ARXR1_EN                (1 << 5)
+#define TWL4030_ARXL2_EN                (1 << 6)
+#define TWL4030_ARXR2_EN                (1 << 7)
+
 /* TWL4030_REG_MICBIAS_CTL (0x04) Fields */
 
 #define TWL4030_MICBIAS2_CTL            0x40