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osk5912.c

/*
 * osk5912.c  --  SoC audio for OSK 5912
 *
 * Copyright (C) 2008 Mistral Solutions
 *
 * Contact: Arun KS  <arunks@mistralsolutions.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.
 *
 * 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/clk.h>
#include <linux/platform_device.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/soc.h>
#include <sound/soc-dapm.h>

#include <asm/mach-types.h>
#include <mach/hardware.h>
#include <linux/gpio.h>
#include <mach/mcbsp.h>

#include "omap-mcbsp.h"
#include "omap-pcm.h"
#include "../codecs/tlv320aic23.h"

#define CODEC_CLOCK     12000000

static struct clk *tlv320aic23_mclk;

static int osk_startup(struct snd_pcm_substream *substream)
{
      return clk_enable(tlv320aic23_mclk);
}

static void osk_shutdown(struct snd_pcm_substream *substream)
{
      clk_disable(tlv320aic23_mclk);
}

static int osk_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 err;

      /* Set codec DAI configuration */
      err = snd_soc_dai_set_fmt(codec_dai,
                          SND_SOC_DAIFMT_DSP_B |
                          SND_SOC_DAIFMT_NB_NF |
                          SND_SOC_DAIFMT_CBM_CFM);
      if (err < 0) {
            printk(KERN_ERR "can't set codec DAI configuration\n");
            return err;
      }

      /* Set cpu DAI configuration */
      err = snd_soc_dai_set_fmt(cpu_dai,
                          SND_SOC_DAIFMT_DSP_B |
                          SND_SOC_DAIFMT_NB_NF |
                          SND_SOC_DAIFMT_CBM_CFM);
      if (err < 0) {
            printk(KERN_ERR "can't set cpu DAI configuration\n");
            return err;
      }

      /* Set the codec system clock for DAC and ADC */
      err =
          snd_soc_dai_set_sysclk(codec_dai, 0, CODEC_CLOCK, SND_SOC_CLOCK_IN);

      if (err < 0) {
            printk(KERN_ERR "can't set codec system clock\n");
            return err;
      }

      return err;
}

static struct snd_soc_ops osk_ops = {
      .startup = osk_startup,
      .hw_params = osk_hw_params,
      .shutdown = osk_shutdown,
};

static const struct snd_soc_dapm_widget tlv320aic23_dapm_widgets[] = {
      SND_SOC_DAPM_HP("Headphone Jack", NULL),
      SND_SOC_DAPM_LINE("Line In", NULL),
      SND_SOC_DAPM_MIC("Mic Jack", NULL),
};

static const struct snd_soc_dapm_route audio_map[] = {
      {"Headphone Jack", NULL, "LHPOUT"},
      {"Headphone Jack", NULL, "RHPOUT"},

      {"LLINEIN", NULL, "Line In"},
      {"RLINEIN", NULL, "Line In"},

      {"MICIN", NULL, "Mic Jack"},
};

static int osk_tlv320aic23_init(struct snd_soc_codec *codec)
{

      /* Add osk5912 specific widgets */
      snd_soc_dapm_new_controls(codec, tlv320aic23_dapm_widgets,
                          ARRAY_SIZE(tlv320aic23_dapm_widgets));

      /* Set up osk5912 specific audio path audio_map */
      snd_soc_dapm_add_routes(codec, audio_map, ARRAY_SIZE(audio_map));

      snd_soc_dapm_enable_pin(codec, "Headphone Jack");
      snd_soc_dapm_enable_pin(codec, "Line In");
      snd_soc_dapm_enable_pin(codec, "Mic Jack");

      snd_soc_dapm_sync(codec);

      return 0;
}

/* Digital audio interface glue - connects codec <--> CPU */
static struct snd_soc_dai_link osk_dai = {
      .name = "TLV320AIC23",
      .stream_name = "AIC23",
      .cpu_dai = &omap_mcbsp_dai[0],
      .codec_dai = &tlv320aic23_dai,
      .init = osk_tlv320aic23_init,
      .ops = &osk_ops,
};

/* Audio machine driver */
static struct snd_soc_card snd_soc_card_osk = {
      .name = "OSK5912",
      .platform = &omap_soc_platform,
      .dai_link = &osk_dai,
      .num_links = 1,
};

/* Audio subsystem */
static struct snd_soc_device osk_snd_devdata = {
      .card = &snd_soc_card_osk,
      .codec_dev = &soc_codec_dev_tlv320aic23,
};

static struct platform_device *osk_snd_device;

static int __init osk_soc_init(void)
{
      int err;
      u32 curRate;
      struct device *dev;

      if (!(machine_is_omap_osk()))
            return -ENODEV;

      osk_snd_device = platform_device_alloc("soc-audio", -1);
      if (!osk_snd_device)
            return -ENOMEM;

      platform_set_drvdata(osk_snd_device, &osk_snd_devdata);
      osk_snd_devdata.dev = &osk_snd_device->dev;
      *(unsigned int *)osk_dai.cpu_dai->private_data = 0;   /* McBSP1 */
      err = platform_device_add(osk_snd_device);
      if (err)
            goto err1;

      dev = &osk_snd_device->dev;

      tlv320aic23_mclk = clk_get(dev, "mclk");
      if (IS_ERR(tlv320aic23_mclk)) {
            printk(KERN_ERR "Could not get mclk clock\n");
            return -ENODEV;
      }

      /*
       * Configure 12 MHz output on MCLK.
       */
      curRate = (uint) clk_get_rate(tlv320aic23_mclk);
      if (curRate != CODEC_CLOCK) {
            if (clk_set_rate(tlv320aic23_mclk, CODEC_CLOCK)) {
                  printk(KERN_ERR "Cannot set MCLK for AIC23 CODEC\n");
                  err = -ECANCELED;
                  goto err1;
            }
      }

      printk(KERN_INFO "MCLK = %d [%d]\n",
             (uint) clk_get_rate(tlv320aic23_mclk), CODEC_CLOCK);

      return 0;
err1:
      clk_put(tlv320aic23_mclk);
      platform_device_del(osk_snd_device);
      platform_device_put(osk_snd_device);

      return err;

}

static void __exit osk_soc_exit(void)
{
      platform_device_unregister(osk_snd_device);
}

module_init(osk_soc_init);
module_exit(osk_soc_exit);

MODULE_AUTHOR("Arun KS <arunks@mistralsolutions.com>");
MODULE_DESCRIPTION("ALSA SoC OSK 5912");
MODULE_LICENSE("GPL");

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