text: /*
   * poodle.c  --  SoC audio for Poodle
   *
   * Copyright 2005 Wolfson Microelectronics PLC.
   * Copyright 2005 Openedhand Ltd.
   *
   * Authors: Liam Girdwood <lrg@slimlogic.co.uk>
   *          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/i2c.h>
  #include <linux/interrupt.h>
  #include <linux/platform_device.h>
  #include <sound/core.h>
  #include <sound/pcm.h>
  #include <sound/soc.h>
  
  #include <asm/mach-types.h>
  #include <asm/hardware/locomo.h>
  #include <mach/poodle.h>
  #include <mach/audio.h>
  
  #include "../codecs/wm8731.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_dapm_context *dapm)
  {
  	/* 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(dapm, "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(dapm, "Headphone Jack");
  	}
  
  	/* set the enpoints to their new connetion states */
  	if (poodle_spk_func == POODLE_SPK_ON)
  		snd_soc_dapm_enable_pin(dapm, "Ext Spk");
  	else
  		snd_soc_dapm_disable_pin(dapm, "Ext Spk");
  
  	/* signal a DAPM event */
  	snd_soc_dapm_sync(dapm);
  }
  
  static int poodle_startup(struct snd_pcm_substream *substream)
  {
  	struct snd_soc_pcm_runtime *rtd = substream->private_data;
  	struct snd_soc_codec *codec = rtd->codec;
  
  	mutex_lock(&codec->mutex);
  
  	/* check the jack status at stream startup */
  	poodle_ext_control(&codec->dapm);
  
  	mutex_unlock(&codec->mutex);
  
  	return 0;
  }
  
  /* we need to unmute the HP at shutdown as the mute burns power on poodle */
  static void poodle_shutdown(struct snd_pcm_substream *substream)
  {
  	/* 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);
  }
  
  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->codec_dai;
  	struct snd_soc_dai *cpu_dai = rtd->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 the codec system clock for DAC and ADC */
  	ret = snd_soc_dai_set_sysclk(codec_dai, WM8731_SYSCLK_XTAL, 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_card *card =  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(&card->dapm);
  	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_card *card =  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(&card->dapm);
  	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 poodle_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 struct snd_kcontrol_new 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_pcm_runtime *rtd)
  {
  	struct snd_soc_codec *codec = rtd->codec;
  	struct snd_soc_dapm_context *dapm = &codec->dapm;
  
  	snd_soc_dapm_nc_pin(dapm, "LLINEIN");
  	snd_soc_dapm_nc_pin(dapm, "RLINEIN");
  	snd_soc_dapm_enable_pin(dapm, "MICIN");
  
  	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_name = "pxa2xx-i2s",
  	.codec_dai_name = "wm8731-hifi",
  	.platform_name = "pxa-pcm-audio",
  	.codec_name = "wm8731.0-001b",
  	.init = poodle_wm8731_init,
  	.dai_fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF |
  		   SND_SOC_DAIFMT_CBS_CFS,
  	.ops = &poodle_ops,
  };
  
  /* poodle audio machine driver */
  static struct snd_soc_card poodle = {
  	.name = "Poodle",
  	.dai_link = &poodle_dai,
  	.num_links = 1,
  	.owner = THIS_MODULE,
  
  	.controls = wm8731_poodle_controls,
  	.num_controls = ARRAY_SIZE(wm8731_poodle_controls),
  	.dapm_widgets = wm8731_dapm_widgets,
  	.num_dapm_widgets = ARRAY_SIZE(wm8731_dapm_widgets),
  	.dapm_routes = poodle_audio_map,
  	.num_dapm_routes = ARRAY_SIZE(poodle_audio_map),
  };
  
  static int __devinit poodle_probe(struct platform_device *pdev)
  {
  	struct snd_soc_card *card = &poodle;
  	int ret;
  
  	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);
  
  	card->dev = &pdev->dev;
  
  	ret = snd_soc_register_card(card);
  	if (ret)
  		dev_err(&pdev->dev, "snd_soc_register_card() failed: %d\n",
  			ret);
  	return ret;
  }
  
  static int __devexit poodle_remove(struct platform_device *pdev)
  {
  	struct snd_soc_card *card = platform_get_drvdata(pdev);
  
  	snd_soc_unregister_card(card);
  	return 0;
  }
  
  static struct platform_driver poodle_driver = {
  	.driver		= {
  		.name	= "poodle-audio",
  		.owner	= THIS_MODULE,
  	},
  	.probe		= poodle_probe,
  	.remove		= __devexit_p(poodle_remove),
  };
  
  module_platform_driver(poodle_driver);
  
  /* Module information */
  MODULE_AUTHOR("Richard Purdie");
  MODULE_DESCRIPTION("ALSA SoC Poodle");
  MODULE_LICENSE("GPL");
  MODULE_ALIAS("platform:poodle-audio");
  