/*
   * ASoC driver for Stretch s6105 IP camera platform
   *
   * Author:      Daniel Gloeckner, <dg@emlix.com>
   * Copyright:   (C) 2009 emlix GmbH <info@emlix.com>
   *
   * 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.
   */
  
  #include <linux/module.h>
  #include <linux/moduleparam.h>
  #include <linux/timer.h>
  #include <linux/interrupt.h>
  #include <linux/platform_device.h>
  #include <linux/i2c.h>
  #include <sound/core.h>
  #include <sound/pcm.h>
  #include <sound/soc.h>
  
  #include <variant/dmac.h>
  
  #include "s6000-pcm.h"
  #include "s6000-i2s.h"
  
  #define S6105_CAM_CODEC_CLOCK 12288000
  
  static int s6105_hw_params(struct snd_pcm_substream *substream,
  			   struct snd_pcm_hw_params *params)
  {
  	struct snd_soc_pcm_runtime *rtd = substream->private_data;
  	struct snd_soc_dai *codec_dai = rtd->codec_dai;
  	struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
  	int ret = 0;
  
  	/* set codec DAI configuration */
  	ret = snd_soc_dai_set_fmt(codec_dai, SND_SOC_DAIFMT_I2S |
  					     SND_SOC_DAIFMT_CBM_CFM);
  	if (ret < 0)
  		return ret;
  
  	/* set cpu DAI configuration */
  	ret = snd_soc_dai_set_fmt(cpu_dai, SND_SOC_DAIFMT_CBM_CFM |
  					   SND_SOC_DAIFMT_NB_NF);
  	if (ret < 0)
  		return ret;
  
  	/* set the codec system clock */
  	ret = snd_soc_dai_set_sysclk(codec_dai, 0, S6105_CAM_CODEC_CLOCK,
  					    SND_SOC_CLOCK_OUT);
  	if (ret < 0)
  		return ret;
  
  	return 0;
  }
  
  static struct snd_soc_ops s6105_ops = {
  	.hw_params = s6105_hw_params,
  };
  
  /* s6105 machine dapm widgets */
  static const struct snd_soc_dapm_widget aic3x_dapm_widgets[] = {
  	SND_SOC_DAPM_LINE("Audio Out Differential", NULL),
  	SND_SOC_DAPM_LINE("Audio Out Stereo", NULL),
  	SND_SOC_DAPM_LINE("Audio In", NULL),
  };
  
  /* s6105 machine audio_mapnections to the codec pins */
  static const struct snd_soc_dapm_route audio_map[] = {
  	/* Audio Out connected to HPLOUT, HPLCOM, HPROUT */
  	{"Audio Out Differential", NULL, "HPLOUT"},
  	{"Audio Out Differential", NULL, "HPLCOM"},
  	{"Audio Out Stereo", NULL, "HPLOUT"},
  	{"Audio Out Stereo", NULL, "HPROUT"},
  
  	/* Audio In connected to LINE1L, LINE1R */
  	{"LINE1L", NULL, "Audio In"},
  	{"LINE1R", NULL, "Audio In"},
  };
  
  static int output_type_info(struct snd_kcontrol *kcontrol,
  			    struct snd_ctl_elem_info *uinfo)
  {
  	uinfo->type = SNDRV_CTL_ELEM_TYPE_ENUMERATED;
  	uinfo->count = 1;
  	uinfo->value.enumerated.items = 2;
  	if (uinfo->value.enumerated.item) {
  		uinfo->value.enumerated.item = 1;
  		strcpy(uinfo->value.enumerated.name, "HPLOUT/HPROUT");
  	} else {
  		strcpy(uinfo->value.enumerated.name, "HPLOUT/HPLCOM");
  	}
  	return 0;
  }
  
  static int output_type_get(struct snd_kcontrol *kcontrol,
  			   struct snd_ctl_elem_value *ucontrol)
  {
  	ucontrol->value.enumerated.item[0] = kcontrol->private_value;
  	return 0;
  }
  
  static int output_type_put(struct snd_kcontrol *kcontrol,
  			   struct snd_ctl_elem_value *ucontrol)
  {
  	struct snd_soc_codec *codec = kcontrol->private_data;
  	struct snd_soc_dapm_context *dapm = &codec->dapm;
  	unsigned int val = (ucontrol->value.enumerated.item[0] != 0);
  	char *differential = "Audio Out Differential";
  	char *stereo = "Audio Out Stereo";
  
  	if (kcontrol->private_value == val)
  		return 0;
  	kcontrol->private_value = val;
  	snd_soc_dapm_disable_pin(dapm, val ? differential : stereo);
  	snd_soc_dapm_sync(dapm);
  	snd_soc_dapm_enable_pin(dapm, val ? stereo : differential);
  	snd_soc_dapm_sync(dapm);
  
  	return 1;
  }
  
  static const struct snd_kcontrol_new audio_out_mux = {
  	.iface = SNDRV_CTL_ELEM_IFACE_MIXER,
  	.name = "Master Output Mux",
  	.index = 0,
  	.access = SNDRV_CTL_ELEM_ACCESS_READWRITE,
  	.info = output_type_info,
  	.get = output_type_get,
  	.put = output_type_put,
  	.private_value = 1 /* default to stereo */
  };
  
  /* Logic for a aic3x as connected on the s6105 ip camera ref design */
  static int s6105_aic3x_init(struct snd_soc_pcm_runtime *rtd)
  {
  	struct snd_soc_codec *codec = rtd->codec;
  	struct snd_soc_dapm_context *dapm = &codec->dapm;
  
  	/* Add s6105 specific widgets */
  	snd_soc_dapm_new_controls(dapm, aic3x_dapm_widgets,
  				  ARRAY_SIZE(aic3x_dapm_widgets));
  
  	/* Set up s6105 specific audio path audio_map */
  	snd_soc_dapm_add_routes(dapm, audio_map, ARRAY_SIZE(audio_map));
  
  	/* not present */
  	snd_soc_dapm_nc_pin(dapm, "MONO_LOUT");
  	snd_soc_dapm_nc_pin(dapm, "LINE2L");
  	snd_soc_dapm_nc_pin(dapm, "LINE2R");
  
  	/* not connected */
  	snd_soc_dapm_nc_pin(dapm, "MIC3L"); /* LINE2L on this chip */
  	snd_soc_dapm_nc_pin(dapm, "MIC3R"); /* LINE2R on this chip */
  	snd_soc_dapm_nc_pin(dapm, "LLOUT");
  	snd_soc_dapm_nc_pin(dapm, "RLOUT");
  	snd_soc_dapm_nc_pin(dapm, "HPRCOM");
  
  	/* always connected */
  	snd_soc_dapm_enable_pin(dapm, "Audio In");
  
  	/* must correspond to audio_out_mux.private_value initializer */
  	snd_soc_dapm_disable_pin(dapm, "Audio Out Differential");
  	snd_soc_dapm_sync(dapm);
  	snd_soc_dapm_enable_pin(dapm, "Audio Out Stereo");
  
  	snd_soc_dapm_sync(dapm);
  
  	snd_ctl_add(codec->card->snd_card, snd_ctl_new1(&audio_out_mux, codec));
  
  	return 0;
  }
  
  /* s6105 digital audio interface glue - connects codec <--> CPU */
  static struct snd_soc_dai_link s6105_dai = {
  	.name = "TLV320AIC31",
  	.stream_name = "AIC31",
  	.cpu_dai_name = "s6000-i2s",
  	.codec_dai_name = "tlv320aic3x-hifi",
  	.platform_name = "s6000-pcm-audio",
  	.codec_name = "tlv320aic3x-codec.0-001a",
  	.init = s6105_aic3x_init,
  	.ops = &s6105_ops,
  };
  
  /* s6105 audio machine driver */
  static struct snd_soc_card snd_soc_card_s6105 = {
  	.name = "Stretch IP Camera",
  	.owner = THIS_MODULE,
  	.dai_link = &s6105_dai,
  	.num_links = 1,
  };
  
  static struct s6000_snd_platform_data s6105_snd_data __initdata = {
  	.wide		= 0,
  	.channel_in	= 0,
  	.channel_out	= 1,
  	.lines_in	= 1,
  	.lines_out	= 1,
  	.same_rate	= 1,
  };
  
  static struct platform_device *s6105_snd_device;
  
  /* temporary i2c device creation until this can be moved into the machine
   * support file.
  */
  static struct i2c_board_info i2c_device[] = {
  	{ I2C_BOARD_INFO("tlv320aic33", 0x18), }
  };
  
  static int __init s6105_init(void)
  {
  	int ret;
  
  	i2c_register_board_info(0, i2c_device, ARRAY_SIZE(i2c_device));
  
  	s6105_snd_device = platform_device_alloc("soc-audio", -1);
  	if (!s6105_snd_device)
  		return -ENOMEM;
  
  	platform_set_drvdata(s6105_snd_device, &snd_soc_card_s6105);
  	platform_device_add_data(s6105_snd_device, &s6105_snd_data,
  				 sizeof(s6105_snd_data));
  
  	ret = platform_device_add(s6105_snd_device);
  	if (ret)
  		platform_device_put(s6105_snd_device);
  
  	return ret;
  }
  
  static void __exit s6105_exit(void)
  {
  	platform_device_unregister(s6105_snd_device);
  }
  
  module_init(s6105_init);
  module_exit(s6105_exit);
  
  MODULE_AUTHOR("Daniel Gloeckner");
  MODULE_DESCRIPTION("Stretch s6105 IP camera ASoC driver");
  MODULE_LICENSE("GPL");