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qi_lb60.c

/*
 * Copyright (C) 2009, Lars-Peter Clausen <lars@metafoo.de>
 *
 * 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.
 *
 *  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.,
 *  675 Mass Ave, Cambridge, MA 02139, USA.
 *
 */

#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/timer.h>
#include <linux/interrupt.h>
#include <linux/platform_device.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/soc.h>
#include <linux/gpio.h>

#define QI_LB60_SND_GPIO JZ_GPIO_PORTB(29)
#define QI_LB60_AMP_GPIO JZ_GPIO_PORTD(4)

static int qi_lb60_spk_event(struct snd_soc_dapm_widget *widget,
                       struct snd_kcontrol *ctrl, int event)
{
      int on = 0;
      if (event & SND_SOC_DAPM_POST_PMU)
            on = 1;
      else if (event & SND_SOC_DAPM_PRE_PMD)
            on = 0;

      gpio_set_value(QI_LB60_SND_GPIO, on);
      gpio_set_value(QI_LB60_AMP_GPIO, on);

      return 0;
}

static const struct snd_soc_dapm_widget qi_lb60_widgets[] = {
      SND_SOC_DAPM_SPK("Speaker", qi_lb60_spk_event),
      SND_SOC_DAPM_MIC("Mic", NULL),
};

static const struct snd_soc_dapm_route qi_lb60_routes[] = {
      {"Mic", NULL, "MIC"},
      {"Speaker", NULL, "LOUT"},
      {"Speaker", NULL, "ROUT"},
};

#define QI_LB60_DAIFMT (SND_SOC_DAIFMT_I2S | \
                  SND_SOC_DAIFMT_NB_NF | \
                  SND_SOC_DAIFMT_CBM_CFM)

static int qi_lb60_codec_init(struct snd_soc_pcm_runtime *rtd)
{
      struct snd_soc_codec *codec = rtd->codec;
      struct snd_soc_dai *cpu_dai = rtd->cpu_dai;
      struct snd_soc_dapm_context *dapm = &codec->dapm;
      int ret;

      snd_soc_dapm_nc_pin(dapm, "LIN");
      snd_soc_dapm_nc_pin(dapm, "RIN");

      ret = snd_soc_dai_set_fmt(cpu_dai, QI_LB60_DAIFMT);
      if (ret < 0) {
            dev_err(codec->dev, "Failed to set cpu dai format: %d\n", ret);
            return ret;
      }

      snd_soc_dapm_new_controls(dapm, qi_lb60_widgets,
                          ARRAY_SIZE(qi_lb60_widgets));
      snd_soc_dapm_add_routes(dapm, qi_lb60_routes,
                        ARRAY_SIZE(qi_lb60_routes));
      snd_soc_dapm_sync(dapm);

      return 0;
}

static struct snd_soc_dai_link qi_lb60_dai = {
      .name = "jz4740",
      .stream_name = "jz4740",
      .cpu_dai_name = "jz4740-i2s",
      .platform_name = "jz4740-pcm-audio",
      .codec_dai_name = "jz4740-hifi",
      .codec_name = "jz4740-codec",
      .init = qi_lb60_codec_init,
};

static struct snd_soc_card qi_lb60 = {
      .name = "QI LB60",
      .dai_link = &qi_lb60_dai,
      .num_links = 1,
};

static struct platform_device *qi_lb60_snd_device;

static int __init qi_lb60_init(void)
{
      int ret;

      qi_lb60_snd_device = platform_device_alloc("soc-audio", -1);

      if (!qi_lb60_snd_device)
            return -ENOMEM;

      ret = gpio_request(QI_LB60_SND_GPIO, "SND");
      if (ret) {
            pr_err("qi_lb60 snd: Failed to request SND GPIO(%d): %d\n",
                        QI_LB60_SND_GPIO, ret);
            goto err_device_put;
      }

      ret = gpio_request(QI_LB60_AMP_GPIO, "AMP");
      if (ret) {
            pr_err("qi_lb60 snd: Failed to request AMP GPIO(%d): %d\n",
                        QI_LB60_AMP_GPIO, ret);
            goto err_gpio_free_snd;
      }

      gpio_direction_output(QI_LB60_SND_GPIO, 0);
      gpio_direction_output(QI_LB60_AMP_GPIO, 0);

      platform_set_drvdata(qi_lb60_snd_device, &qi_lb60);

      ret = platform_device_add(qi_lb60_snd_device);
      if (ret) {
            pr_err("qi_lb60 snd: Failed to add snd soc device: %d\n", ret);
            goto err_unset_pdata;
      }

       return 0;

err_unset_pdata:
      platform_set_drvdata(qi_lb60_snd_device, NULL);
/*err_gpio_free_amp:*/
      gpio_free(QI_LB60_AMP_GPIO);
err_gpio_free_snd:
      gpio_free(QI_LB60_SND_GPIO);
err_device_put:
      platform_device_put(qi_lb60_snd_device);

      return ret;
}
module_init(qi_lb60_init);

static void __exit qi_lb60_exit(void)
{
      gpio_free(QI_LB60_AMP_GPIO);
      gpio_free(QI_LB60_SND_GPIO);
      platform_device_unregister(qi_lb60_snd_device);
}
module_exit(qi_lb60_exit);

MODULE_AUTHOR("Lars-Peter Clausen <lars@metafoo.de>");
MODULE_DESCRIPTION("ALSA SoC QI LB60 Audio support");
MODULE_LICENSE("GPL v2");

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