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s6105-ipcam.c

/*
 * 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",
      .dai_link = &s6105_dai,
      .num_links = 1,
};

static struct s6000_snd_platform_data __initdata s6105_snd_data = {
      .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");

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