ASoC: TWL4030: Add support Voice DAI

Add Voice DAI to support the PCM voice interface of the twl4030 codec.

The PCM voice interface can be used with 8-kHz(voice narrowband) or
16-kHz(voice wideband) sampling rates, and 16bits, and mono RX and mono
TX or stereo TX.

The PCM voice interface has two modes
 - PCM mode1 : This uses the normal FS polarity and the rising edge of
               the clock signal.
 - PCM mode2 : This uses the FS polarity inverted and the falling edge
               of the clock signal.

If the system master clock is not 26MHz or the twl4030 codec mode is not
option2, the voice PCM interface is not available.

Signed-off-by: Joonyoung Shim <jy0922.shim@samsung.com>
Acked-by: Peter Ujfalusi <peter.ujfalusi@nokia.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

1 files changed, 168 insertions, 5 deletions

diff --git a/sound/soc/codecs/twl4030.c b/sound/soc/codecs/twl4030.c
index a1b76d7fd130..cc2968cf6409 100644
--- a/sound/soc/codecs/twl4030.c
+++ b/sound/soc/codecs/twl4030.c
@@ -1484,6 +1484,144 @@ static int twl4030_set_dai_fmt(struct snd_soc_dai *codec_dai,
         return 0;
 }
 
+static int twl4030_voice_startup(struct snd_pcm_substream *substream,
+                struct snd_soc_dai *dai)
+{
+        struct snd_soc_pcm_runtime *rtd = substream->private_data;
+        struct snd_soc_device *socdev = rtd->socdev;
+        struct snd_soc_codec *codec = socdev->card->codec;
+        u8 infreq;
+        u8 mode;
+
+        /* If the system master clock is not 26MHz, the voice PCM interface is
+         * not avilable.
+         */
+        infreq = twl4030_read_reg_cache(codec, TWL4030_REG_APLL_CTL)
+                & TWL4030_APLL_INFREQ;
+
+        if (infreq != TWL4030_APLL_INFREQ_26000KHZ) {
+                printk(KERN_ERR "TWL4030 voice startup: "
+                        "MCLK is not 26MHz, call set_sysclk() on init\n");
+                return -EINVAL;
+        }
+
+        /* If the codec mode is not option2, the voice PCM interface is not
+         * avilable.
+         */
+        mode = twl4030_read_reg_cache(codec, TWL4030_REG_CODEC_MODE)
+                & TWL4030_OPT_MODE;
+
+        if (mode != TWL4030_OPTION_2) {
+                printk(KERN_ERR "TWL4030 voice startup: "
+                        "the codec mode is not option2\n");
+                return -EINVAL;
+        }
+
+        return 0;
+}
+
+static int twl4030_voice_hw_params(struct snd_pcm_substream *substream,
+                struct snd_pcm_hw_params *params, struct snd_soc_dai *dai)
+{
+        struct snd_soc_pcm_runtime *rtd = substream->private_data;
+        struct snd_soc_device *socdev = rtd->socdev;
+        struct snd_soc_codec *codec = socdev->card->codec;
+        u8 old_mode, mode;
+
+        /* bit rate */
+        old_mode = twl4030_read_reg_cache(codec, TWL4030_REG_CODEC_MODE)
+                & ~(TWL4030_CODECPDZ);
+        mode = old_mode;
+
+        switch (params_rate(params)) {
+        case 8000:
+                mode &= ~(TWL4030_SEL_16K);
+                break;
+        case 16000:
+                mode |= TWL4030_SEL_16K;
+                break;
+        default:
+                printk(KERN_ERR "TWL4030 voice hw params: unknown rate %d\n",
+                        params_rate(params));
+                return -EINVAL;
+        }
+
+        if (mode != old_mode) {
+                /* change rate and set CODECPDZ */
+                twl4030_codec_enable(codec, 0);
+                twl4030_write(codec, TWL4030_REG_CODEC_MODE, mode);
+                twl4030_codec_enable(codec, 1);
+        }
+
+        return 0;
+}
+
+static int twl4030_voice_set_dai_sysclk(struct snd_soc_dai *codec_dai,
+                int clk_id, unsigned int freq, int dir)
+{
+        struct snd_soc_codec *codec = codec_dai->codec;
+        u8 infreq;
+
+        switch (freq) {
+        case 26000000:
+                infreq = TWL4030_APLL_INFREQ_26000KHZ;
+                break;
+        default:
+                printk(KERN_ERR "TWL4030 voice set sysclk: unknown rate %d\n",
+                        freq);
+                return -EINVAL;
+        }
+
+        infreq |= TWL4030_APLL_EN;
+        twl4030_write(codec, TWL4030_REG_APLL_CTL, infreq);
+
+        return 0;
+}
+
+static int twl4030_voice_set_dai_fmt(struct snd_soc_dai *codec_dai,
+                unsigned int fmt)
+{
+        struct snd_soc_codec *codec = codec_dai->codec;
+        u8 old_format, format;
+
+        /* get format */
+        old_format = twl4030_read_reg_cache(codec, TWL4030_REG_VOICE_IF);
+        format = old_format;
+
+        /* set master/slave audio interface */
+        switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
+        case SND_SOC_DAIFMT_CBS_CFM:
+                format &= ~(TWL4030_VIF_SLAVE_EN);
+                break;
+        case SND_SOC_DAIFMT_CBS_CFS:
+                format |= TWL4030_VIF_SLAVE_EN;
+                break;
+        default:
+                return -EINVAL;
+        }
+
+        /* clock inversion */
+        switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
+        case SND_SOC_DAIFMT_IB_NF:
+                format &= ~(TWL4030_VIF_FORMAT);
+                break;
+        case SND_SOC_DAIFMT_NB_IF:
+                format |= TWL4030_VIF_FORMAT;
+                break;
+        default:
+                return -EINVAL;
+        }
+
+        if (format != old_format) {
+                /* change format and set CODECPDZ */
+                twl4030_codec_enable(codec, 0);
+                twl4030_write(codec, TWL4030_REG_VOICE_IF, format);
+                twl4030_codec_enable(codec, 1);
+        }
+
+        return 0;
+}
+
 #define TWL4030_RATES    (SNDRV_PCM_RATE_8000_48000)
 #define TWL4030_FORMATS  (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FORMAT_S24_LE)
 
@@ -1495,7 +1633,15 @@ static struct snd_soc_dai_ops twl4030_dai_ops = {
         .set_fmt        = twl4030_set_dai_fmt,
 };
 
-struct snd_soc_dai twl4030_dai = {
+static struct snd_soc_dai_ops twl4030_dai_voice_ops = {
+        .startup        = twl4030_voice_startup,
+        .hw_params      = twl4030_voice_hw_params,
+        .set_sysclk     = twl4030_voice_set_dai_sysclk,
+        .set_fmt        = twl4030_voice_set_dai_fmt,
+};
+
+struct snd_soc_dai twl4030_dai[] = {
+{
         .name = "twl4030",
         .playback = {
                 .stream_name = "Playback",
@@ -1510,6 +1656,23 @@ struct snd_soc_dai twl4030_dai = {
                 .rates = TWL4030_RATES,
                 .formats = TWL4030_FORMATS,},
         .ops = &twl4030_dai_ops,
+},
+{
+        .name = "twl4030 Voice",
+        .playback = {
+                .stream_name = "Playback",
+                .channels_min = 1,
+                .channels_max = 1,
+                .rates = SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_16000,
+                .formats = SNDRV_PCM_FMTBIT_S16_LE,},
+        .capture = {
+                .stream_name = "Capture",
+                .channels_min = 1,
+                .channels_max = 2,
+                .rates = SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_16000,
+                .formats = SNDRV_PCM_FMTBIT_S16_LE,},
+        .ops = &twl4030_dai_voice_ops,
+},
 };
 EXPORT_SYMBOL_GPL(twl4030_dai);
 
@@ -1550,8 +1713,8 @@ static int twl4030_init(struct snd_soc_device *socdev)
         codec->read = twl4030_read_reg_cache;
         codec->write = twl4030_write;
         codec->set_bias_level = twl4030_set_bias_level;
-        codec->dai = &twl4030_dai;
-        codec->num_dai = 1;
+        codec->dai = twl4030_dai;
+        codec->num_dai = ARRAY_SIZE(twl4030_dai),
         codec->reg_cache_size = sizeof(twl4030_reg);
         codec->reg_cache = kmemdup(twl4030_reg, sizeof(twl4030_reg),
                                         GFP_KERNEL);
@@ -1645,13 +1808,13 @@ EXPORT_SYMBOL_GPL(soc_codec_dev_twl4030);
 
 static int __init twl4030_modinit(void)
 {
-        return snd_soc_register_dai(&twl4030_dai);
+        return snd_soc_register_dais(&twl4030_dai[0], ARRAY_SIZE(twl4030_dai));
 }
 module_init(twl4030_modinit);
 
 static void __exit twl4030_exit(void)
 {
-        snd_soc_unregister_dai(&twl4030_dai);
+        snd_soc_unregister_dais(&twl4030_dai[0], ARRAY_SIZE(twl4030_dai));
 }
 module_exit(twl4030_exit);