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raumfeld.c

/*
 * raumfeld_audio.c  --  SoC audio for Raumfeld audio devices
 *
 * Copyright (c) 2009 Daniel Mack <daniel@caiaq.de>
 *
 * based on code from:
 *
 *    Wolfson Microelectronics PLC.
 *    Openedhand Ltd.
 *    Liam Girdwood <lrg@slimlogic.co.uk>
 *    Richard Purdie <richard@openedhand.com>
 *
 * This program is free software; you can redistribute  it and/or modify it
 * under  the terms of  the GNU General  Public License as published by the
 * Free Software Foundation;  either version 2 of the  License, or (at your
 * option) any later version.
 */

#include <linux/module.h>
#include <linux/i2c.h>
#include <linux/delay.h>
#include <linux/gpio.h>
#include <sound/pcm.h>
#include <sound/soc.h>
#include <sound/soc-dapm.h>

#include <asm/mach-types.h>

#include "../codecs/cs4270.h"
#include "../codecs/ak4104.h"
#include "pxa2xx-pcm.h"
#include "pxa-ssp.h"

#define GPIO_SPDIF_RESET      (38)
#define GPIO_MCLK_RESET       (111)
#define GPIO_CODEC_RESET      (120)

static struct i2c_client *max9486_client;
static struct i2c_board_info max9486_hwmon_info = {
      I2C_BOARD_INFO("max9485", 0x63),
};

#define MAX9485_MCLK_FREQ_112896 0x22
#define     MAX9485_MCLK_FREQ_122880 0x23

static void set_max9485_clk(char clk)
{
      i2c_master_send(max9486_client, &clk, 1);
}

static void raumfeld_enable_audio(bool en)
{
      if (en) {
            gpio_set_value(GPIO_MCLK_RESET, 1);

            /* wait some time to let the clocks become stable */
            msleep(100);

            gpio_set_value(GPIO_SPDIF_RESET, 1);
            gpio_set_value(GPIO_CODEC_RESET, 1);
      } else {
            gpio_set_value(GPIO_MCLK_RESET, 0);
            gpio_set_value(GPIO_SPDIF_RESET, 0);
            gpio_set_value(GPIO_CODEC_RESET, 0);
      }
}

/* CS4270 */
static int raumfeld_cs4270_startup(struct snd_pcm_substream *substream)
{
      struct snd_soc_pcm_runtime *rtd = substream->private_data;
      struct snd_soc_dai *codec_dai = rtd->dai->codec_dai;

      set_max9485_clk(MAX9485_MCLK_FREQ_112896);

      return snd_soc_dai_set_sysclk(codec_dai, 0, 11289600, 0);
}

static int raumfeld_cs4270_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->dai->codec_dai;
      struct snd_soc_dai *cpu_dai = rtd->dai->cpu_dai;
      unsigned int fmt, clk = 0;
      int ret = 0;

      switch (params_rate(params)) {
      case 8000:
      case 16000:
      case 48000:
      case 96000:
            set_max9485_clk(MAX9485_MCLK_FREQ_122880);
            clk = 12288000;
            break;
      case 11025:
      case 22050:
      case 44100:
      case 88200:
            set_max9485_clk(MAX9485_MCLK_FREQ_112896);
            clk = 11289600;
            break;
      }

      fmt = SND_SOC_DAIFMT_I2S |
            SND_SOC_DAIFMT_NB_NF |
            SND_SOC_DAIFMT_CBS_CFS;

      /* setup the CODEC DAI */
      ret = snd_soc_dai_set_fmt(codec_dai, fmt);
      if (ret < 0)
            return ret;

      ret = snd_soc_dai_set_sysclk(codec_dai, 0, clk, 0);
      if (ret < 0)
            return ret;

      /* setup the CPU DAI */
      ret = snd_soc_dai_set_pll(cpu_dai, 0, 0, 0, clk);
      if (ret < 0)
            return ret;

      ret = snd_soc_dai_set_fmt(cpu_dai, fmt);
      if (ret < 0)
            return ret;

      ret = snd_soc_dai_set_clkdiv(cpu_dai, PXA_SSP_DIV_SCR, 4);
      if (ret < 0)
            return ret;

      ret = snd_soc_dai_set_sysclk(cpu_dai, PXA_SSP_CLK_EXT, 0, 1);
      if (ret < 0)
            return ret;

      return 0;
}

static struct snd_soc_ops raumfeld_cs4270_ops = {
      .startup = raumfeld_cs4270_startup,
      .hw_params = raumfeld_cs4270_hw_params,
};

static int raumfeld_line_suspend(struct platform_device *pdev, pm_message_t state)
{
      raumfeld_enable_audio(false);
      return 0;
}

static int raumfeld_line_resume(struct platform_device *pdev)
{
      raumfeld_enable_audio(true);
      return 0;
}

static struct snd_soc_dai_link raumfeld_line_dai = {
      .name       = "CS4270",
      .stream_name      = "CS4270",
      .cpu_dai    = &pxa_ssp_dai[PXA_DAI_SSP1],
      .codec_dai  = &cs4270_dai,
      .ops        = &raumfeld_cs4270_ops,
};

static struct snd_soc_card snd_soc_line_raumfeld = {
      .name       = "Raumfeld analog",
      .platform   = &pxa2xx_soc_platform,
      .dai_link   = &raumfeld_line_dai,
      .suspend_post     = raumfeld_line_suspend,
      .resume_pre = raumfeld_line_resume,
      .num_links  = 1,
};


/* AK4104 */

static int raumfeld_ak4104_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->dai->codec_dai;
      struct snd_soc_dai *cpu_dai = rtd->dai->cpu_dai;
      int fmt, ret = 0, clk = 0;

      switch (params_rate(params)) {
      case 8000:
      case 16000:
      case 48000:
      case 96000:
            set_max9485_clk(MAX9485_MCLK_FREQ_122880);
            clk = 12288000;
            break;
      case 11025:
      case 22050:
      case 44100:
      case 88200:
            set_max9485_clk(MAX9485_MCLK_FREQ_112896);
            clk = 11289600;
            break;
      }

      fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF;

      /* setup the CODEC DAI */
      ret = snd_soc_dai_set_fmt(codec_dai, fmt | SND_SOC_DAIFMT_CBS_CFS);
      if (ret < 0)
            return ret;

      /* setup the CPU DAI */
      ret = snd_soc_dai_set_pll(cpu_dai, 0, 0, 0, clk);
      if (ret < 0)
            return ret;

      ret = snd_soc_dai_set_fmt(cpu_dai, fmt | SND_SOC_DAIFMT_CBS_CFS);
      if (ret < 0)
            return ret;

      ret = snd_soc_dai_set_clkdiv(cpu_dai, PXA_SSP_DIV_SCR, 4);
      if (ret < 0)
            return ret;

      ret = snd_soc_dai_set_sysclk(cpu_dai, PXA_SSP_CLK_EXT, 0, 1);
      if (ret < 0)
            return ret;

      return 0;
}

static struct snd_soc_ops raumfeld_ak4104_ops = {
      .hw_params = raumfeld_ak4104_hw_params,
};

static struct snd_soc_dai_link raumfeld_spdif_dai = {
      .name       = "ak4104",
      .stream_name      = "Playback",
      .cpu_dai    = &pxa_ssp_dai[PXA_DAI_SSP2],
      .codec_dai  = &ak4104_dai,
      .ops        = &raumfeld_ak4104_ops,
};

static struct snd_soc_card snd_soc_spdif_raumfeld = {
      .name       = "Raumfeld S/PDIF",
      .platform   = &pxa2xx_soc_platform,
      .dai_link   = &raumfeld_spdif_dai,
      .num_links  = 1
};

/* raumfeld_audio audio subsystem */
static struct snd_soc_device raumfeld_line_devdata = {
      .card = &snd_soc_line_raumfeld,
      .codec_dev = &soc_codec_device_cs4270,
};

static struct snd_soc_device raumfeld_spdif_devdata = {
      .card = &snd_soc_spdif_raumfeld,
      .codec_dev = &soc_codec_device_ak4104,
};

static struct platform_device *raumfeld_audio_line_device;
static struct platform_device *raumfeld_audio_spdif_device;

static int __init raumfeld_audio_init(void)
{
      int ret;

      if (!machine_is_raumfeld_speaker() &&
          !machine_is_raumfeld_connector())
            return 0;

      max9486_client = i2c_new_device(i2c_get_adapter(0),
                              &max9486_hwmon_info);

      if (!max9486_client)
            return -ENOMEM;

      set_max9485_clk(MAX9485_MCLK_FREQ_122880);

      /* LINE */
      raumfeld_audio_line_device = platform_device_alloc("soc-audio", 0);
      if (!raumfeld_audio_line_device)
            return -ENOMEM;

      platform_set_drvdata(raumfeld_audio_line_device,
                       &raumfeld_line_devdata);
      raumfeld_line_devdata.dev = &raumfeld_audio_line_device->dev;
      ret = platform_device_add(raumfeld_audio_line_device);
      if (ret)
            platform_device_put(raumfeld_audio_line_device);

      /* no S/PDIF on Speakers */
      if (machine_is_raumfeld_speaker())
            return ret;

      /* S/PDIF */
      raumfeld_audio_spdif_device = platform_device_alloc("soc-audio", 1);
      if (!raumfeld_audio_spdif_device) {
            platform_device_put(raumfeld_audio_line_device);
            return -ENOMEM;
      }

      platform_set_drvdata(raumfeld_audio_spdif_device,
                       &raumfeld_spdif_devdata);
      raumfeld_spdif_devdata.dev = &raumfeld_audio_spdif_device->dev;
      ret = platform_device_add(raumfeld_audio_spdif_device);
      if (ret) {
            platform_device_put(raumfeld_audio_line_device);
            platform_device_put(raumfeld_audio_spdif_device);
      }

      raumfeld_enable_audio(true);

      return ret;
}

static void __exit raumfeld_audio_exit(void)
{
      raumfeld_enable_audio(false);

      platform_device_unregister(raumfeld_audio_line_device);

      if (machine_is_raumfeld_connector())
            platform_device_unregister(raumfeld_audio_spdif_device);

      i2c_unregister_device(max9486_client);

      gpio_free(GPIO_MCLK_RESET);
      gpio_free(GPIO_CODEC_RESET);
      gpio_free(GPIO_SPDIF_RESET);
}

module_init(raumfeld_audio_init);
module_exit(raumfeld_audio_exit);

/* Module information */
MODULE_AUTHOR("Daniel Mack <daniel@caiaq.de>");
MODULE_DESCRIPTION("Raumfeld audio SoC");
MODULE_LICENSE("GPL");

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