text: /*
   * ALSA SoC WL1273 codec driver
   *
   * Author:      Matti Aaltonen, <matti.j.aaltonen@nokia.com>
   *
   * Copyright:   (C) 2010, 2011 Nokia Corporation
   *
   * This program is free software; you can redistribute it and/or
   * modify it under the terms of the GNU General Public License
   * version 2 as published by the Free Software Foundation.
   *
   * This program is distributed in the hope that it will be useful, but
   * WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   * General Public License for more details.
   *
   * You should have received a copy of the GNU General Public License
   * along with this program; if not, write to the Free Software
   * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
   * 02110-1301 USA
   *
   */
  
  #include <linux/mfd/wl1273-core.h>
  #include <linux/slab.h>
  #include <linux/module.h>
  #include <sound/pcm.h>
  #include <sound/pcm_params.h>
  #include <sound/soc.h>
  #include <sound/initval.h>
  
  #include "wl1273.h"
  
  enum wl1273_mode { WL1273_MODE_BT, WL1273_MODE_FM_RX, WL1273_MODE_FM_TX };
  
  /* codec private data */
  struct wl1273_priv {
  	enum wl1273_mode mode;
  	struct wl1273_core *core;
  	unsigned int channels;
  };
  
  static int snd_wl1273_fm_set_i2s_mode(struct wl1273_core *core,
  				      int rate, int width)
  {
  	struct device *dev = &core->client->dev;
  	int r = 0;
  	u16 mode;
  
  	dev_dbg(dev, "rate: %d\n", rate);
  	dev_dbg(dev, "width: %d\n", width);
  
  	mutex_lock(&core->lock);
  
  	mode = core->i2s_mode & ~WL1273_IS2_WIDTH & ~WL1273_IS2_RATE;
  
  	switch (rate) {
  	case 48000:
  		mode |= WL1273_IS2_RATE_48K;
  		break;
  	case 44100:
  		mode |= WL1273_IS2_RATE_44_1K;
  		break;
  	case 32000:
  		mode |= WL1273_IS2_RATE_32K;
  		break;
  	case 22050:
  		mode |= WL1273_IS2_RATE_22_05K;
  		break;
  	case 16000:
  		mode |= WL1273_IS2_RATE_16K;
  		break;
  	case 12000:
  		mode |= WL1273_IS2_RATE_12K;
  		break;
  	case 11025:
  		mode |= WL1273_IS2_RATE_11_025;
  		break;
  	case 8000:
  		mode |= WL1273_IS2_RATE_8K;
  		break;
  	default:
  		dev_err(dev, "Sampling rate: %d not supported\n", rate);
  		r = -EINVAL;
  		goto out;
  	}
  
  	switch (width) {
  	case 16:
  		mode |= WL1273_IS2_WIDTH_32;
  		break;
  	case 20:
  		mode |= WL1273_IS2_WIDTH_40;
  		break;
  	case 24:
  		mode |= WL1273_IS2_WIDTH_48;
  		break;
  	case 25:
  		mode |= WL1273_IS2_WIDTH_50;
  		break;
  	case 30:
  		mode |= WL1273_IS2_WIDTH_60;
  		break;
  	case 32:
  		mode |= WL1273_IS2_WIDTH_64;
  		break;
  	case 40:
  		mode |= WL1273_IS2_WIDTH_80;
  		break;
  	case 48:
  		mode |= WL1273_IS2_WIDTH_96;
  		break;
  	case 64:
  		mode |= WL1273_IS2_WIDTH_128;
  		break;
  	default:
  		dev_err(dev, "Data width: %d not supported\n", width);
  		r = -EINVAL;
  		goto out;
  	}
  
  	dev_dbg(dev, "WL1273_I2S_DEF_MODE: 0x%04x\n",  WL1273_I2S_DEF_MODE);
  	dev_dbg(dev, "core->i2s_mode: 0x%04x\n", core->i2s_mode);
  	dev_dbg(dev, "mode: 0x%04x\n", mode);
  
  	if (core->i2s_mode != mode) {
  		r = core->write(core, WL1273_I2S_MODE_CONFIG_SET, mode);
  		if (r)
  			goto out;
  
  		core->i2s_mode = mode;
  		r = core->write(core, WL1273_AUDIO_ENABLE,
  				WL1273_AUDIO_ENABLE_I2S);
  		if (r)
  			goto out;
  	}
  out:
  	mutex_unlock(&core->lock);
  
  	return r;
  }
  
  static int snd_wl1273_fm_set_channel_number(struct wl1273_core *core,
  					    int channel_number)
  {
  	struct device *dev = &core->client->dev;
  	int r = 0;
  
  	dev_dbg(dev, "%s\n", __func__);
  
  	mutex_lock(&core->lock);
  
  	if (core->channel_number == channel_number)
  		goto out;
  
  	if (channel_number == 1 && core->mode == WL1273_MODE_RX)
  		r = core->write(core, WL1273_MOST_MODE_SET, WL1273_RX_MONO);
  	else if (channel_number == 1 && core->mode == WL1273_MODE_TX)
  		r = core->write(core, WL1273_MONO_SET, WL1273_TX_MONO);
  	else if (channel_number == 2 && core->mode == WL1273_MODE_RX)
  		r = core->write(core, WL1273_MOST_MODE_SET, WL1273_RX_STEREO);
  	else if (channel_number == 2 && core->mode == WL1273_MODE_TX)
  		r = core->write(core, WL1273_MONO_SET, WL1273_TX_STEREO);
  	else
  		r = -EINVAL;
  out:
  	mutex_unlock(&core->lock);
  
  	return r;
  }
  
  static int snd_wl1273_get_audio_route(struct snd_kcontrol *kcontrol,
  				      struct snd_ctl_elem_value *ucontrol)
  {
  	struct snd_soc_codec *codec = snd_kcontrol_chip(kcontrol);
  	struct wl1273_priv *wl1273 = snd_soc_codec_get_drvdata(codec);
  
  	ucontrol->value.integer.value[0] = wl1273->mode;
  
  	return 0;
  }
  
  /*
   * TODO: Implement the audio routing in the driver. Now this control
   * only indicates the setting that has been done elsewhere (in the user
   * space).
   */
  static const char * const wl1273_audio_route[] = { "Bt", "FmRx", "FmTx" };
  
  static int snd_wl1273_set_audio_route(struct snd_kcontrol *kcontrol,
  				      struct snd_ctl_elem_value *ucontrol)
  {
  	struct snd_soc_codec *codec = snd_kcontrol_chip(kcontrol);
  	struct wl1273_priv *wl1273 = snd_soc_codec_get_drvdata(codec);
  
  	if (wl1273->mode == ucontrol->value.integer.value[0])
  		return 0;
  
  	/* Do not allow changes while stream is running */
  	if (codec->active)
  		return -EPERM;
  
  	if (ucontrol->value.integer.value[0] < 0 ||
  	    ucontrol->value.integer.value[0] >=  ARRAY_SIZE(wl1273_audio_route))
  		return -EINVAL;
  
  	wl1273->mode = ucontrol->value.integer.value[0];
  
  	return 1;
  }
  
  static const struct soc_enum wl1273_enum =
  	SOC_ENUM_SINGLE_EXT(ARRAY_SIZE(wl1273_audio_route), wl1273_audio_route);
  
  static int snd_wl1273_fm_audio_get(struct snd_kcontrol *kcontrol,
  				   struct snd_ctl_elem_value *ucontrol)
  {
  	struct snd_soc_codec *codec = snd_kcontrol_chip(kcontrol);
  	struct wl1273_priv *wl1273 = snd_soc_codec_get_drvdata(codec);
  
  	dev_dbg(codec->dev, "%s: enter.\n", __func__);
  
  	ucontrol->value.integer.value[0] = wl1273->core->audio_mode;
  
  	return 0;
  }
  
  static int snd_wl1273_fm_audio_put(struct snd_kcontrol *kcontrol,
  				   struct snd_ctl_elem_value *ucontrol)
  {
  	struct snd_soc_codec *codec = snd_kcontrol_chip(kcontrol);
  	struct wl1273_priv *wl1273 = snd_soc_codec_get_drvdata(codec);
  	int val, r = 0;
  
  	dev_dbg(codec->dev, "%s: enter.\n", __func__);
  
  	val = ucontrol->value.integer.value[0];
  	if (wl1273->core->audio_mode == val)
  		return 0;
  
  	r = wl1273->core->set_audio(wl1273->core, val);
  	if (r < 0)
  		return r;
  
  	return 1;
  }
  
  static const char * const wl1273_audio_strings[] = { "Digital", "Analog" };
  
  static const struct soc_enum wl1273_audio_enum =
  	SOC_ENUM_SINGLE_EXT(ARRAY_SIZE(wl1273_audio_strings),
  			    wl1273_audio_strings);
  
  static int snd_wl1273_fm_volume_get(struct snd_kcontrol *kcontrol,
  				    struct snd_ctl_elem_value *ucontrol)
  {
  	struct snd_soc_codec *codec = snd_kcontrol_chip(kcontrol);
  	struct wl1273_priv *wl1273 = snd_soc_codec_get_drvdata(codec);
  
  	dev_dbg(codec->dev, "%s: enter.\n", __func__);
  
  	ucontrol->value.integer.value[0] = wl1273->core->volume;
  
  	return 0;
  }
  
  static int snd_wl1273_fm_volume_put(struct snd_kcontrol *kcontrol,
  				    struct snd_ctl_elem_value *ucontrol)
  {
  	struct snd_soc_codec *codec = snd_kcontrol_chip(kcontrol);
  	struct wl1273_priv *wl1273 = snd_soc_codec_get_drvdata(codec);
  	int r;
  
  	dev_dbg(codec->dev, "%s: enter.\n", __func__);
  
  	r = wl1273->core->set_volume(wl1273->core,
  				     ucontrol->value.integer.value[0]);
  	if (r)
  		return r;
  
  	return 1;
  }
  
  static const struct snd_kcontrol_new wl1273_controls[] = {
  	SOC_ENUM_EXT("Codec Mode", wl1273_enum,
  		     snd_wl1273_get_audio_route, snd_wl1273_set_audio_route),
  	SOC_ENUM_EXT("Audio Switch", wl1273_audio_enum,
  		     snd_wl1273_fm_audio_get,  snd_wl1273_fm_audio_put),
  	SOC_SINGLE_EXT("Volume", 0, 0, WL1273_MAX_VOLUME, 0,
  		       snd_wl1273_fm_volume_get, snd_wl1273_fm_volume_put),
  };
  
  static int wl1273_startup(struct snd_pcm_substream *substream,
  			  struct snd_soc_dai *dai)
  {
  	struct snd_soc_pcm_runtime *rtd = substream->private_data;
  	struct snd_soc_codec *codec = rtd->codec;
  	struct wl1273_priv *wl1273 = snd_soc_codec_get_drvdata(codec);
  
  	switch (wl1273->mode) {
  	case WL1273_MODE_BT:
  		snd_pcm_hw_constraint_minmax(substream->runtime,
  					     SNDRV_PCM_HW_PARAM_RATE,
  					     8000, 8000);
  		snd_pcm_hw_constraint_minmax(substream->runtime,
  					     SNDRV_PCM_HW_PARAM_CHANNELS, 1, 1);
  		break;
  	case WL1273_MODE_FM_RX:
  		if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
  			pr_err("Cannot play in RX mode.\n");
  			return -EINVAL;
  		}
  		break;
  	case WL1273_MODE_FM_TX:
  		if (substream->stream == SNDRV_PCM_STREAM_CAPTURE) {
  			pr_err("Cannot capture in TX mode.\n");
  			return -EINVAL;
  		}
  		break;
  	default:
  		return -EINVAL;
  		break;
  	}
  
  	return 0;
  }
  
  static int wl1273_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 wl1273_priv *wl1273 = snd_soc_codec_get_drvdata(rtd->codec);
  	struct wl1273_core *core = wl1273->core;
  	unsigned int rate, width, r;
  
  	if (params_format(params) != SNDRV_PCM_FORMAT_S16_LE) {
  		pr_err("Only SNDRV_PCM_FORMAT_S16_LE supported.\n");
  		return -EINVAL;
  	}
  
  	rate = params_rate(params);
  	width =  hw_param_interval(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS)->min;
  
  	if (wl1273->mode == WL1273_MODE_BT) {
  		if (rate != 8000) {
  			pr_err("Rate %d not supported.\n", params_rate(params));
  			return -EINVAL;
  		}
  
  		if (params_channels(params) != 1) {
  			pr_err("Only mono supported.\n");
  			return -EINVAL;
  		}
  
  		return 0;
  	}
  
  	if (wl1273->mode == WL1273_MODE_FM_TX &&
  	    substream->stream == SNDRV_PCM_STREAM_CAPTURE) {
  		pr_err("Only playback supported with TX.\n");
  		return -EINVAL;
  	}
  
  	if (wl1273->mode == WL1273_MODE_FM_RX  &&
  	    substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
  		pr_err("Only capture supported with RX.\n");
  		return -EINVAL;
  	}
  
  	if (wl1273->mode != WL1273_MODE_FM_RX  &&
  	    wl1273->mode != WL1273_MODE_FM_TX) {
  		pr_err("Unexpected mode: %d.\n", wl1273->mode);
  		return -EINVAL;
  	}
  
  	r = snd_wl1273_fm_set_i2s_mode(core, rate, width);
  	if (r)
  		return r;
  
  	wl1273->channels = params_channels(params);
  	r = snd_wl1273_fm_set_channel_number(core, wl1273->channels);
  	if (r)
  		return r;
  
  	return 0;
  }
  
  static const struct snd_soc_dai_ops wl1273_dai_ops = {
  	.startup	= wl1273_startup,
  	.hw_params	= wl1273_hw_params,
  };
  
  static struct snd_soc_dai_driver wl1273_dai = {
  	.name = "wl1273-fm",
  	.playback = {
  		.stream_name = "Playback",
  		.channels_min = 1,
  		.channels_max = 2,
  		.rates = SNDRV_PCM_RATE_8000_48000,
  		.formats = SNDRV_PCM_FMTBIT_S16_LE},
  	.capture = {
  		.stream_name = "Capture",
  		.channels_min = 1,
  		.channels_max = 2,
  		.rates = SNDRV_PCM_RATE_8000_48000,
  		.formats = SNDRV_PCM_FMTBIT_S16_LE},
  	.ops = &wl1273_dai_ops,
  };
  
  /* Audio interface format for the soc_card driver */
  int wl1273_get_format(struct snd_soc_codec *codec, unsigned int *fmt)
  {
  	struct wl1273_priv *wl1273;
  
  	if (codec == NULL || fmt == NULL)
  		return -EINVAL;
  
  	wl1273 = snd_soc_codec_get_drvdata(codec);
  
  	switch (wl1273->mode) {
  	case WL1273_MODE_FM_RX:
  	case WL1273_MODE_FM_TX:
  		*fmt =	SND_SOC_DAIFMT_I2S |
  			SND_SOC_DAIFMT_NB_NF |
  			SND_SOC_DAIFMT_CBM_CFM;
  
  		break;
  	case WL1273_MODE_BT:
  		*fmt =	SND_SOC_DAIFMT_DSP_A |
  			SND_SOC_DAIFMT_IB_NF |
  			SND_SOC_DAIFMT_CBM_CFM;
  
  		break;
  	default:
  		return -EINVAL;
  	}
  
  	return 0;
  }
  EXPORT_SYMBOL_GPL(wl1273_get_format);
  
  static int wl1273_probe(struct snd_soc_codec *codec)
  {
  	struct wl1273_core **core = codec->dev->platform_data;
  	struct wl1273_priv *wl1273;
  	int r;
  
  	dev_dbg(codec->dev, "%s.\n", __func__);
  
  	if (!core) {
  		dev_err(codec->dev, "Platform data is missing.\n");
  		return -EINVAL;
  	}
  
  	wl1273 = kzalloc(sizeof(struct wl1273_priv), GFP_KERNEL);
  	if (wl1273 == NULL) {
  		dev_err(codec->dev, "Cannot allocate memory.\n");
  		return -ENOMEM;
  	}
  
  	wl1273->mode = WL1273_MODE_BT;
  	wl1273->core = *core;
  
  	snd_soc_codec_set_drvdata(codec, wl1273);
  
  	r = snd_soc_add_controls(codec, wl1273_controls,
  				 ARRAY_SIZE(wl1273_controls));
  	if (r)
  		kfree(wl1273);
  
  	return r;
  }
  
  static int wl1273_remove(struct snd_soc_codec *codec)
  {
  	struct wl1273_priv *wl1273 = snd_soc_codec_get_drvdata(codec);
  
  	dev_dbg(codec->dev, "%s\n", __func__);
  	kfree(wl1273);
  
  	return 0;
  }
  
  static struct snd_soc_codec_driver soc_codec_dev_wl1273 = {
  	.probe = wl1273_probe,
  	.remove = wl1273_remove,
  };
  
  static int __devinit wl1273_platform_probe(struct platform_device *pdev)
  {
  	return snd_soc_register_codec(&pdev->dev, &soc_codec_dev_wl1273,
  				      &wl1273_dai, 1);
  }
  
  static int __devexit wl1273_platform_remove(struct platform_device *pdev)
  {
  	snd_soc_unregister_codec(&pdev->dev);
  	return 0;
  }
  
  MODULE_ALIAS("platform:wl1273-codec");
  
  static struct platform_driver wl1273_platform_driver = {
  	.driver		= {
  		.name	= "wl1273-codec",
  		.owner	= THIS_MODULE,
  	},
  	.probe		= wl1273_platform_probe,
  	.remove		= __devexit_p(wl1273_platform_remove),
  };
  
  module_platform_driver(wl1273_platform_driver);
  
  MODULE_AUTHOR("Matti Aaltonen <matti.j.aaltonen@nokia.com>");
  MODULE_DESCRIPTION("ASoC WL1273 codec driver");
  MODULE_LICENSE("GPL");
  