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poodle.c

/*
 * poodle.c  --  SoC audio for Poodle
 *
 * Copyright 2005 Wolfson Microelectronics PLC.
 * Copyright 2005 Openedhand Ltd.
 *
 * Authors: Liam Girdwood <liam.girdwood@wolfsonmicro.com>
 *          Richard Purdie <richard@openedhand.com>
 *
 *  This program is free software; you can redistribute  it and/or modify it
 *  under  the terms of  the GNU General  Public License as published by the
 *  Free Software Foundation;  either version 2 of the  License, or (at your
 *  option) any later version.
 *
 */

#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 <sound/soc-dapm.h>

#include <asm/mach-types.h>
#include <asm/hardware/locomo.h>
#include <asm/arch/pxa-regs.h>
#include <asm/arch/hardware.h>
#include <asm/arch/poodle.h>
#include <asm/arch/audio.h>

#include "../codecs/wm8731.h"
#include "pxa2xx-pcm.h"
#include "pxa2xx-i2s.h"

#define POODLE_HP        1
#define POODLE_HP_OFF    0
#define POODLE_SPK_ON    1
#define POODLE_SPK_OFF   0

 /* audio clock in Hz - rounded from 12.235MHz */
#define POODLE_AUDIO_CLOCK 12288000

static int poodle_jack_func;
static int poodle_spk_func;

static void poodle_ext_control(struct snd_soc_codec *codec)
{
      /* set up jack connection */
      if (poodle_jack_func == POODLE_HP) {
            /* set = unmute headphone */
            locomo_gpio_write(&poodle_locomo_device.dev,
                  POODLE_LOCOMO_GPIO_MUTE_L, 1);
            locomo_gpio_write(&poodle_locomo_device.dev,
                  POODLE_LOCOMO_GPIO_MUTE_R, 1);
            snd_soc_dapm_enable_pin(codec, "Headphone Jack");
      } else {
            locomo_gpio_write(&poodle_locomo_device.dev,
                  POODLE_LOCOMO_GPIO_MUTE_L, 0);
            locomo_gpio_write(&poodle_locomo_device.dev,
                  POODLE_LOCOMO_GPIO_MUTE_R, 0);
            snd_soc_dapm_disable_pin(codec, "Headphone Jack");
      }

      /* set the enpoints to their new connetion states */
      if (poodle_spk_func == POODLE_SPK_ON)
            snd_soc_dapm_enable_pin(codec, "Ext Spk");
      else
            snd_soc_dapm_disable_pin(codec, "Ext Spk");

      /* signal a DAPM event */
      snd_soc_dapm_sync(codec);
}

static int poodle_startup(struct snd_pcm_substream *substream)
{
      struct snd_soc_pcm_runtime *rtd = substream->private_data;
      struct snd_soc_codec *codec = rtd->socdev->codec;

      /* check the jack status at stream startup */
      poodle_ext_control(codec);
      return 0;
}

/* we need to unmute the HP at shutdown as the mute burns power on poodle */
static int poodle_shutdown(struct snd_pcm_substream *substream)
{
      struct snd_soc_pcm_runtime *rtd = substream->private_data;
      struct snd_soc_codec *codec = rtd->socdev->codec;

      /* set = unmute headphone */
      locomo_gpio_write(&poodle_locomo_device.dev,
            POODLE_LOCOMO_GPIO_MUTE_L, 1);
      locomo_gpio_write(&poodle_locomo_device.dev,
            POODLE_LOCOMO_GPIO_MUTE_R, 1);
      return 0;
}

static int poodle_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 clk = 0;
      int ret = 0;

      switch (params_rate(params)) {
      case 8000:
      case 16000:
      case 48000:
      case 96000:
            clk = 12288000;
            break;
      case 11025:
      case 22050:
      case 44100:
            clk = 11289600;
            break;
      }

      /* set codec DAI configuration */
      ret = snd_soc_dai_set_fmt(codec_dai, SND_SOC_DAIFMT_I2S |
            SND_SOC_DAIFMT_NB_NF | SND_SOC_DAIFMT_CBS_CFS);
      if (ret < 0)
            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_CBS_CFS);
      if (ret < 0)
            return ret;

      /* set the codec system clock for DAC and ADC */
      ret = snd_soc_dai_set_sysclk(codec_dai, WM8731_SYSCLK, clk,
            SND_SOC_CLOCK_IN);
      if (ret < 0)
            return ret;

      /* set the I2S system clock as input (unused) */
      ret = snd_soc_dai_set_sysclk(cpu_dai, PXA2XX_I2S_SYSCLK, 0,
            SND_SOC_CLOCK_IN);
      if (ret < 0)
            return ret;

      return 0;
}

static struct snd_soc_ops poodle_ops = {
      .startup = poodle_startup,
      .hw_params = poodle_hw_params,
      .shutdown = poodle_shutdown,
};

static int poodle_get_jack(struct snd_kcontrol *kcontrol,
      struct snd_ctl_elem_value *ucontrol)
{
      ucontrol->value.integer.value[0] = poodle_jack_func;
      return 0;
}

static int poodle_set_jack(struct snd_kcontrol *kcontrol,
      struct snd_ctl_elem_value *ucontrol)
{
      struct snd_soc_codec *codec =  snd_kcontrol_chip(kcontrol);

      if (poodle_jack_func == ucontrol->value.integer.value[0])
            return 0;

      poodle_jack_func = ucontrol->value.integer.value[0];
      poodle_ext_control(codec);
      return 1;
}

static int poodle_get_spk(struct snd_kcontrol *kcontrol,
      struct snd_ctl_elem_value *ucontrol)
{
      ucontrol->value.integer.value[0] = poodle_spk_func;
      return 0;
}

static int poodle_set_spk(struct snd_kcontrol *kcontrol,
      struct snd_ctl_elem_value *ucontrol)
{
      struct snd_soc_codec *codec =  snd_kcontrol_chip(kcontrol);

      if (poodle_spk_func == ucontrol->value.integer.value[0])
            return 0;

      poodle_spk_func = ucontrol->value.integer.value[0];
      poodle_ext_control(codec);
      return 1;
}

static int poodle_amp_event(struct snd_soc_dapm_widget *w,
      struct snd_kcontrol *k, int event)
{
      if (SND_SOC_DAPM_EVENT_ON(event))
            locomo_gpio_write(&poodle_locomo_device.dev,
                  POODLE_LOCOMO_GPIO_AMP_ON, 0);
      else
            locomo_gpio_write(&poodle_locomo_device.dev,
                  POODLE_LOCOMO_GPIO_AMP_ON, 1);

      return 0;
}

/* poodle machine dapm widgets */
static const struct snd_soc_dapm_widget wm8731_dapm_widgets[] = {
SND_SOC_DAPM_HP("Headphone Jack", NULL),
SND_SOC_DAPM_SPK("Ext Spk", poodle_amp_event),
};

/* Corgi machine connections to the codec pins */
static const struct snd_soc_dapm_route audio_map[] = {

      /* headphone connected to LHPOUT1, RHPOUT1 */
      {"Headphone Jack", NULL, "LHPOUT"},
      {"Headphone Jack", NULL, "RHPOUT"},

      /* speaker connected to LOUT, ROUT */
      {"Ext Spk", NULL, "ROUT"},
      {"Ext Spk", NULL, "LOUT"},
};

static const char *jack_function[] = {"Off", "Headphone"};
static const char *spk_function[] = {"Off", "On"};
static const struct soc_enum poodle_enum[] = {
      SOC_ENUM_SINGLE_EXT(2, jack_function),
      SOC_ENUM_SINGLE_EXT(2, spk_function),
};

static const snd_kcontrol_new_t wm8731_poodle_controls[] = {
      SOC_ENUM_EXT("Jack Function", poodle_enum[0], poodle_get_jack,
            poodle_set_jack),
      SOC_ENUM_EXT("Speaker Function", poodle_enum[1], poodle_get_spk,
            poodle_set_spk),
};

/*
 * Logic for a wm8731 as connected on a Sharp SL-C7x0 Device
 */
static int poodle_wm8731_init(struct snd_soc_codec *codec)
{
      int i, err;

      snd_soc_dapm_disable_pin(codec, "LLINEIN");
      snd_soc_dapm_disable_pin(codec, "RLINEIN");
      snd_soc_dapm_enable_pin(codec, "MICIN");

      /* Add poodle specific controls */
      for (i = 0; i < ARRAY_SIZE(wm8731_poodle_controls); i++) {
            err = snd_ctl_add(codec->card,
                  snd_soc_cnew(&wm8731_poodle_controls[i], codec, NULL));
            if (err < 0)
                  return err;
      }

      /* Add poodle specific widgets */
      snd_soc_dapm_new_controls(codec, wm8731_dapm_widgets,
                          ARRAY_SIZE(wm8731_dapm_widgets));

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

      snd_soc_dapm_sync(codec);
      return 0;
}

/* poodle digital audio interface glue - connects codec <--> CPU */
static struct snd_soc_dai_link poodle_dai = {
      .name = "WM8731",
      .stream_name = "WM8731",
      .cpu_dai = &pxa_i2s_dai,
      .codec_dai = &wm8731_dai,
      .init = poodle_wm8731_init,
      .ops = &poodle_ops,
};

/* poodle audio machine driver */
static struct snd_soc_machine snd_soc_machine_poodle = {
      .name = "Poodle",
      .dai_link = &poodle_dai,
      .num_links = 1,
};

/* poodle audio private data */
static struct wm8731_setup_data poodle_wm8731_setup = {
      .i2c_address = 0x1b,
};

/* poodle audio subsystem */
static struct snd_soc_device poodle_snd_devdata = {
      .machine = &snd_soc_machine_poodle,
      .platform = &pxa2xx_soc_platform,
      .codec_dev = &soc_codec_dev_wm8731,
      .codec_data = &poodle_wm8731_setup,
};

static struct platform_device *poodle_snd_device;

static int __init poodle_init(void)
{
      int ret;

      if (!machine_is_poodle())
            return -ENODEV;

      locomo_gpio_set_dir(&poodle_locomo_device.dev,
            POODLE_LOCOMO_GPIO_AMP_ON, 0);
      /* should we mute HP at startup - burning power ?*/
      locomo_gpio_set_dir(&poodle_locomo_device.dev,
            POODLE_LOCOMO_GPIO_MUTE_L, 0);
      locomo_gpio_set_dir(&poodle_locomo_device.dev,
            POODLE_LOCOMO_GPIO_MUTE_R, 0);

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

      platform_set_drvdata(poodle_snd_device, &poodle_snd_devdata);
      poodle_snd_devdata.dev = &poodle_snd_device->dev;
      ret = platform_device_add(poodle_snd_device);

      if (ret)
            platform_device_put(poodle_snd_device);

      return ret;
}

static void __exit poodle_exit(void)
{
      platform_device_unregister(poodle_snd_device);
}

module_init(poodle_init);
module_exit(poodle_exit);

/* Module information */
MODULE_AUTHOR("Richard Purdie");
MODULE_DESCRIPTION("ALSA SoC Poodle");
MODULE_LICENSE("GPL");

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