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omap2evm.c

/*
 * omap2evm.c  --  SoC audio machine driver for omap2evm board
 *
 * Author: Arun KS <arunks@mistralsolutions.com>
 *
 * Based on sound/soc/omap/overo.c by Steve Sakoman
 *
 * 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 omap2evm_hw_params(struct snd_pcm_substream *substream,
      struct snd_pcm_hw_params *params,
      struct snd_soc_dai *dai)
{
      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 ret;

      /* Set codec DAI configuration */
      ret = snd_soc_dai_set_fmt(codec_dai,
                          SND_SOC_DAIFMT_I2S |
                          SND_SOC_DAIFMT_NB_NF |
                          SND_SOC_DAIFMT_CBM_CFM);
      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,
                          SND_SOC_DAIFMT_I2S |
                          SND_SOC_DAIFMT_NB_NF |
                          SND_SOC_DAIFMT_CBM_CFM);
      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 omap2evm_ops = {
      .hw_params = omap2evm_hw_params,
};

/* Digital audio interface glue - connects codec <--> CPU */
static struct snd_soc_dai_link omap2evm_dai = {
      .name = "TWL4030",
      .stream_name = "TWL4030",
      .cpu_dai = &omap_mcbsp_dai[0],
      .codec_dai = &twl4030_dai[TWL4030_DAI_HIFI],
      .ops = &omap2evm_ops,
};

/* Audio machine driver */
static struct snd_soc_card snd_soc_omap2evm = {
      .name = "omap2evm",
      .platform = &omap_soc_platform,
      .dai_link = &omap2evm_dai,
      .num_links = 1,
};

/* Audio subsystem */
static struct snd_soc_device omap2evm_snd_devdata = {
      .card = &snd_soc_omap2evm,
      .codec_dev = &soc_codec_dev_twl4030,
};

static struct platform_device *omap2evm_snd_device;

static int __init omap2evm_soc_init(void)
{
      int ret;

      if (!machine_is_omap2evm()) {
            pr_debug("Not omap2evm!\n");
            return -ENODEV;
      }
      printk(KERN_INFO "omap2evm SoC init\n");

      omap2evm_snd_device = platform_device_alloc("soc-audio", -1);
      if (!omap2evm_snd_device) {
            printk(KERN_ERR "Platform device allocation failed\n");
            return -ENOMEM;
      }

      platform_set_drvdata(omap2evm_snd_device, &omap2evm_snd_devdata);
      omap2evm_snd_devdata.dev = &omap2evm_snd_device->dev;
      *(unsigned int *)omap2evm_dai.cpu_dai->private_data = 1; /* McBSP2 */

      ret = platform_device_add(omap2evm_snd_device);
      if (ret)
            goto err1;

      return 0;

err1:
      printk(KERN_ERR "Unable to add platform device\n");
      platform_device_put(omap2evm_snd_device);

      return ret;
}
module_init(omap2evm_soc_init);

static void __exit omap2evm_soc_exit(void)
{
      platform_device_unregister(omap2evm_snd_device);
}
module_exit(omap2evm_soc_exit);

MODULE_AUTHOR("Arun KS <arunks@mistralsolutions.com>");
MODULE_DESCRIPTION("ALSA SoC omap2evm");
MODULE_LICENSE("GPL");

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