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omap3pandora.c

/*
 * omap3pandora.c  --  SoC audio for Pandora Handheld Console
 *
 * Author: GraÅžvydas Ignotas <notasas@gmail.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 <linux/gpio.h>
#include <linux/delay.h>
#include <linux/regulator/consumer.h>

#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/soc.h>

#include <asm/mach-types.h>
#include <plat/mcbsp.h>

#include "omap-mcbsp.h"
#include "omap-pcm.h"

#define OMAP3_PANDORA_DAC_POWER_GPIO      118
#define OMAP3_PANDORA_AMP_POWER_GPIO      14

#define PREFIX "ASoC omap3pandora: "

static struct regulator *omap3pandora_dac_reg;

static int omap3pandora_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 fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF |
              SND_SOC_DAIFMT_CBS_CFS;
      int ret;

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

      /* Set McBSP clock to external */
      ret = snd_soc_dai_set_sysclk(cpu_dai, OMAP_MCBSP_SYSCLK_CLKS_EXT,
                             256 * params_rate(params),
                             SND_SOC_CLOCK_IN);
      if (ret < 0) {
            pr_err(PREFIX "can't set cpu system clock\n");
            return ret;
      }

      ret = snd_soc_dai_set_clkdiv(cpu_dai, OMAP_MCBSP_CLKGDV, 8);
      if (ret < 0) {
            pr_err(PREFIX "can't set SRG clock divider\n");
            return ret;
      }

      return 0;
}

static int omap3pandora_dac_event(struct snd_soc_dapm_widget *w,
      struct snd_kcontrol *k, int event)
{
      /*
       * The PCM1773 DAC datasheet requires 1ms delay between switching
       * VCC power on/off and /PD pin high/low
       */
      if (SND_SOC_DAPM_EVENT_ON(event)) {
            regulator_enable(omap3pandora_dac_reg);
            mdelay(1);
            gpio_set_value(OMAP3_PANDORA_DAC_POWER_GPIO, 1);
      } else {
            gpio_set_value(OMAP3_PANDORA_DAC_POWER_GPIO, 0);
            mdelay(1);
            regulator_disable(omap3pandora_dac_reg);
      }

      return 0;
}

static int omap3pandora_hp_event(struct snd_soc_dapm_widget *w,
      struct snd_kcontrol *k, int event)
{
      if (SND_SOC_DAPM_EVENT_ON(event))
            gpio_set_value(OMAP3_PANDORA_AMP_POWER_GPIO, 1);
      else
            gpio_set_value(OMAP3_PANDORA_AMP_POWER_GPIO, 0);

      return 0;
}

/*
 * Audio paths on Pandora board:
 *
 *  |O| ---> PCM DAC +-> AMP -> Headphone Jack
 *  |M|         A    +--------> Line Out
 *  |A| <~~clk~~+
 *  |P| <--- TWL4030 <--------- Line In and MICs
 */
static const struct snd_soc_dapm_widget omap3pandora_out_dapm_widgets[] = {
      SND_SOC_DAPM_DAC_E("PCM DAC", "HiFi Playback", SND_SOC_NOPM,
                     0, 0, omap3pandora_dac_event,
                     SND_SOC_DAPM_POST_PMU | SND_SOC_DAPM_PRE_PMD),
      SND_SOC_DAPM_PGA_E("Headphone Amplifier", SND_SOC_NOPM,
                     0, 0, NULL, 0, omap3pandora_hp_event,
                     SND_SOC_DAPM_POST_PMU | SND_SOC_DAPM_PRE_PMD),
      SND_SOC_DAPM_HP("Headphone Jack", NULL),
      SND_SOC_DAPM_LINE("Line Out", NULL),
};

static const struct snd_soc_dapm_widget omap3pandora_in_dapm_widgets[] = {
      SND_SOC_DAPM_MIC("Mic (internal)", NULL),
      SND_SOC_DAPM_MIC("Mic (external)", NULL),
      SND_SOC_DAPM_LINE("Line In", NULL),
};

static const struct snd_soc_dapm_route omap3pandora_out_map[] = {
      {"PCM DAC", NULL, "APLL Enable"},
      {"Headphone Amplifier", NULL, "PCM DAC"},
      {"Line Out", NULL, "PCM DAC"},
      {"Headphone Jack", NULL, "Headphone Amplifier"},
};

static const struct snd_soc_dapm_route omap3pandora_in_map[] = {
      {"AUXL", NULL, "Line In"},
      {"AUXR", NULL, "Line In"},

      {"MAINMIC", NULL, "Mic Bias 1"},
      {"Mic Bias 1", NULL, "Mic (internal)"},

      {"SUBMIC", NULL, "Mic Bias 2"},
      {"Mic Bias 2", NULL, "Mic (external)"},
};

static int omap3pandora_out_init(struct snd_soc_pcm_runtime *rtd)
{
      struct snd_soc_codec *codec = rtd->codec;
      struct snd_soc_dapm_context *dapm = &codec->dapm;
      int ret;

      /* All TWL4030 output pins are floating */
      snd_soc_dapm_nc_pin(dapm, "EARPIECE");
      snd_soc_dapm_nc_pin(dapm, "PREDRIVEL");
      snd_soc_dapm_nc_pin(dapm, "PREDRIVER");
      snd_soc_dapm_nc_pin(dapm, "HSOL");
      snd_soc_dapm_nc_pin(dapm, "HSOR");
      snd_soc_dapm_nc_pin(dapm, "CARKITL");
      snd_soc_dapm_nc_pin(dapm, "CARKITR");
      snd_soc_dapm_nc_pin(dapm, "HFL");
      snd_soc_dapm_nc_pin(dapm, "HFR");
      snd_soc_dapm_nc_pin(dapm, "VIBRA");

      ret = snd_soc_dapm_new_controls(dapm, omap3pandora_out_dapm_widgets,
                        ARRAY_SIZE(omap3pandora_out_dapm_widgets));
      if (ret < 0)
            return ret;

      snd_soc_dapm_add_routes(dapm, omap3pandora_out_map,
            ARRAY_SIZE(omap3pandora_out_map));

      return snd_soc_dapm_sync(dapm);
}

static int omap3pandora_in_init(struct snd_soc_pcm_runtime *rtd)
{
      struct snd_soc_codec *codec = rtd->codec;
      struct snd_soc_dapm_context *dapm = &codec->dapm;
      int ret;

      /* Not comnnected */
      snd_soc_dapm_nc_pin(dapm, "HSMIC");
      snd_soc_dapm_nc_pin(dapm, "CARKITMIC");
      snd_soc_dapm_nc_pin(dapm, "DIGIMIC0");
      snd_soc_dapm_nc_pin(dapm, "DIGIMIC1");

      ret = snd_soc_dapm_new_controls(dapm, omap3pandora_in_dapm_widgets,
                        ARRAY_SIZE(omap3pandora_in_dapm_widgets));
      if (ret < 0)
            return ret;

      snd_soc_dapm_add_routes(dapm, omap3pandora_in_map,
            ARRAY_SIZE(omap3pandora_in_map));

      return snd_soc_dapm_sync(dapm);
}

static struct snd_soc_ops omap3pandora_ops = {
      .hw_params = omap3pandora_hw_params,
};

/* Digital audio interface glue - connects codec <--> CPU */
static struct snd_soc_dai_link omap3pandora_dai[] = {
      {
            .name = "PCM1773",
            .stream_name = "HiFi Out",
            .cpu_dai_name = "omap-mcbsp-dai.1",
            .codec_dai_name = "twl4030-hifi",
            .platform_name = "omap-pcm-audio",
            .codec_name = "twl4030-codec",
            .ops = &omap3pandora_ops,
            .init = omap3pandora_out_init,
      }, {
            .name = "TWL4030",
            .stream_name = "Line/Mic In",
            .cpu_dai_name = "omap-mcbsp-dai.3",
            .codec_dai_name = "twl4030-hifi",
            .platform_name = "omap-pcm-audio",
            .codec_name = "twl4030-codec",
            .ops = &omap3pandora_ops,
            .init = omap3pandora_in_init,
      }
};

/* SoC card */
static struct snd_soc_card snd_soc_card_omap3pandora = {
      .name = "omap3pandora",
      .dai_link = omap3pandora_dai,
      .num_links = ARRAY_SIZE(omap3pandora_dai),
};

static struct platform_device *omap3pandora_snd_device;

static int __init omap3pandora_soc_init(void)
{
      int ret;

      if (!machine_is_omap3_pandora())
            return -ENODEV;

      pr_info("OMAP3 Pandora SoC init\n");

      ret = gpio_request(OMAP3_PANDORA_DAC_POWER_GPIO, "dac_power");
      if (ret) {
            pr_err(PREFIX "Failed to get DAC power GPIO\n");
            return ret;
      }

      ret = gpio_direction_output(OMAP3_PANDORA_DAC_POWER_GPIO, 0);
      if (ret) {
            pr_err(PREFIX "Failed to set DAC power GPIO direction\n");
            goto fail0;
      }

      ret = gpio_request(OMAP3_PANDORA_AMP_POWER_GPIO, "amp_power");
      if (ret) {
            pr_err(PREFIX "Failed to get amp power GPIO\n");
            goto fail0;
      }

      ret = gpio_direction_output(OMAP3_PANDORA_AMP_POWER_GPIO, 0);
      if (ret) {
            pr_err(PREFIX "Failed to set amp power GPIO direction\n");
            goto fail1;
      }

      omap3pandora_snd_device = platform_device_alloc("soc-audio", -1);
      if (omap3pandora_snd_device == NULL) {
            pr_err(PREFIX "Platform device allocation failed\n");
            ret = -ENOMEM;
            goto fail1;
      }

      platform_set_drvdata(omap3pandora_snd_device, &snd_soc_card_omap3pandora);

      ret = platform_device_add(omap3pandora_snd_device);
      if (ret) {
            pr_err(PREFIX "Unable to add platform device\n");
            goto fail2;
      }

      omap3pandora_dac_reg = regulator_get(&omap3pandora_snd_device->dev, "vcc");
      if (IS_ERR(omap3pandora_dac_reg)) {
            pr_err(PREFIX "Failed to get DAC regulator from %s: %ld\n",
                  dev_name(&omap3pandora_snd_device->dev),
                  PTR_ERR(omap3pandora_dac_reg));
            ret = PTR_ERR(omap3pandora_dac_reg);
            goto fail3;
      }

      return 0;

fail3:
      platform_device_del(omap3pandora_snd_device);
fail2:
      platform_device_put(omap3pandora_snd_device);
fail1:
      gpio_free(OMAP3_PANDORA_AMP_POWER_GPIO);
fail0:
      gpio_free(OMAP3_PANDORA_DAC_POWER_GPIO);
      return ret;
}
module_init(omap3pandora_soc_init);

static void __exit omap3pandora_soc_exit(void)
{
      regulator_put(omap3pandora_dac_reg);
      platform_device_unregister(omap3pandora_snd_device);
      gpio_free(OMAP3_PANDORA_AMP_POWER_GPIO);
      gpio_free(OMAP3_PANDORA_DAC_POWER_GPIO);
}
module_exit(omap3pandora_soc_exit);

MODULE_AUTHOR("Grazvydas Ignotas <notasas@gmail.com>");
MODULE_DESCRIPTION("ALSA SoC OMAP3 Pandora");
MODULE_LICENSE("GPL");

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