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omap3beagle.c

/*
 * omap3beagle.c  --  SoC audio for OMAP3 Beagle
 *
 * Author: Steve Sakoman <steve@sakoman.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 <mach/gpio.h>
#include <mach/mcbsp.h>

#include "omap-mcbsp.h"
#include "omap-pcm.h"
#include "../codecs/twl4030.h"

static int omap3beagle_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;
      int ret;

      switch (params_channels(params)) {
      case 2: /* Stereo I2S mode */
            fmt = SND_SOC_DAIFMT_I2S |
                  SND_SOC_DAIFMT_NB_NF |
                  SND_SOC_DAIFMT_CBM_CFM;
            break;
      case 4: /* Four channel TDM mode */
            fmt = SND_SOC_DAIFMT_DSP_A |
                  SND_SOC_DAIFMT_IB_NF |
                  SND_SOC_DAIFMT_CBM_CFM;
            break;
      default:
            return -EINVAL;
      }

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

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

      /* Set the codec system clock for DAC and ADC */
      ret = snd_soc_dai_set_sysclk(codec_dai, 0, 26000000,
                             SND_SOC_CLOCK_IN);
      if (ret < 0) {
            printk(KERN_ERR "can't set codec system clock\n");
            return ret;
      }

      return 0;
}

static struct snd_soc_ops omap3beagle_ops = {
      .hw_params = omap3beagle_hw_params,
};

/* Digital audio interface glue - connects codec <--> CPU */
static struct snd_soc_dai_link omap3beagle_dai = {
      .name = "TWL4030",
      .stream_name = "TWL4030",
      .cpu_dai = &omap_mcbsp_dai[0],
      .codec_dai = &twl4030_dai[TWL4030_DAI_HIFI],
      .ops = &omap3beagle_ops,
};

/* Audio machine driver */
static struct snd_soc_card snd_soc_omap3beagle = {
      .name = "omap3beagle",
      .platform = &omap_soc_platform,
      .dai_link = &omap3beagle_dai,
      .num_links = 1,
};

/* Audio subsystem */
static struct snd_soc_device omap3beagle_snd_devdata = {
      .card = &snd_soc_omap3beagle,
      .codec_dev = &soc_codec_dev_twl4030,
};

static struct platform_device *omap3beagle_snd_device;

static int __init omap3beagle_soc_init(void)
{
      int ret;

      if (!machine_is_omap3_beagle()) {
            pr_debug("Not OMAP3 Beagle!\n");
            return -ENODEV;
      }
      pr_info("OMAP3 Beagle SoC init\n");

      omap3beagle_snd_device = platform_device_alloc("soc-audio", -1);
      if (!omap3beagle_snd_device) {
            printk(KERN_ERR "Platform device allocation failed\n");
            return -ENOMEM;
      }

      platform_set_drvdata(omap3beagle_snd_device, &omap3beagle_snd_devdata);
      omap3beagle_snd_devdata.dev = &omap3beagle_snd_device->dev;
      *(unsigned int *)omap3beagle_dai.cpu_dai->private_data = 1; /* McBSP2 */

      ret = platform_device_add(omap3beagle_snd_device);
      if (ret)
            goto err1;

      return 0;

err1:
      printk(KERN_ERR "Unable to add platform device\n");
      platform_device_put(omap3beagle_snd_device);

      return ret;
}

static void __exit omap3beagle_soc_exit(void)
{
      platform_device_unregister(omap3beagle_snd_device);
}

module_init(omap3beagle_soc_init);
module_exit(omap3beagle_soc_exit);

MODULE_AUTHOR("Steve Sakoman <steve@sakoman.com>");
MODULE_DESCRIPTION("ALSA SoC OMAP3 Beagle");
MODULE_LICENSE("GPL");

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