text: /*
   * corgi.c  --  SoC audio for Corgi
   *
   * 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 <linux/gpio.h>
  #include <sound/core.h>
  #include <sound/pcm.h>
  #include <sound/soc.h>
  
  #include <asm/mach-types.h>
  #include <mach/corgi.h>
  #include <mach/audio.h>
  
  #include "../codecs/wm8731.h"
  #include "pxa2xx-i2s.h"
  
  #define CORGI_HP        0
  #define CORGI_MIC       1
  #define CORGI_LINE      2
  #define CORGI_HEADSET   3
  #define CORGI_HP_OFF    4
  #define CORGI_SPK_ON    0
  #define CORGI_SPK_OFF   1
  
   /* audio clock in Hz - rounded from 12.235MHz */
  #define CORGI_AUDIO_CLOCK 12288000
  
  static int corgi_jack_func;
  static int corgi_spk_func;
  
  static void corgi_ext_control(struct snd_soc_dapm_context *dapm)
  {
  	snd_soc_dapm_mutex_lock(dapm);
  
  	/* set up jack connection */
  	switch (corgi_jack_func) {
  	case CORGI_HP:
  		/* set = unmute headphone */
  		gpio_set_value(CORGI_GPIO_MUTE_L, 1);
  		gpio_set_value(CORGI_GPIO_MUTE_R, 1);
  		snd_soc_dapm_disable_pin_unlocked(dapm, "Mic Jack");
  		snd_soc_dapm_disable_pin_unlocked(dapm, "Line Jack");
  		snd_soc_dapm_enable_pin_unlocked(dapm, "Headphone Jack");
  		snd_soc_dapm_disable_pin_unlocked(dapm, "Headset Jack");
  		break;
  	case CORGI_MIC:
  		/* reset = mute headphone */
  		gpio_set_value(CORGI_GPIO_MUTE_L, 0);
  		gpio_set_value(CORGI_GPIO_MUTE_R, 0);
  		snd_soc_dapm_enable_pin_unlocked(dapm, "Mic Jack");
  		snd_soc_dapm_disable_pin_unlocked(dapm, "Line Jack");
  		snd_soc_dapm_disable_pin_unlocked(dapm, "Headphone Jack");
  		snd_soc_dapm_disable_pin_unlocked(dapm, "Headset Jack");
  		break;
  	case CORGI_LINE:
  		gpio_set_value(CORGI_GPIO_MUTE_L, 0);
  		gpio_set_value(CORGI_GPIO_MUTE_R, 0);
  		snd_soc_dapm_disable_pin_unlocked(dapm, "Mic Jack");
  		snd_soc_dapm_enable_pin_unlocked(dapm, "Line Jack");
  		snd_soc_dapm_disable_pin_unlocked(dapm, "Headphone Jack");
  		snd_soc_dapm_disable_pin_unlocked(dapm, "Headset Jack");
  		break;
  	case CORGI_HEADSET:
  		gpio_set_value(CORGI_GPIO_MUTE_L, 0);
  		gpio_set_value(CORGI_GPIO_MUTE_R, 1);
  		snd_soc_dapm_enable_pin_unlocked(dapm, "Mic Jack");
  		snd_soc_dapm_disable_pin_unlocked(dapm, "Line Jack");
  		snd_soc_dapm_disable_pin_unlocked(dapm, "Headphone Jack");
  		snd_soc_dapm_enable_pin_unlocked(dapm, "Headset Jack");
  		break;
  	}
  
  	if (corgi_spk_func == CORGI_SPK_ON)
  		snd_soc_dapm_enable_pin_unlocked(dapm, "Ext Spk");
  	else
  		snd_soc_dapm_disable_pin_unlocked(dapm, "Ext Spk");
  
  	/* signal a DAPM event */
  	snd_soc_dapm_sync_unlocked(dapm);
  
  	snd_soc_dapm_mutex_unlock(dapm);
  }
  
  static int corgi_startup(struct snd_pcm_substream *substream)
  {
  	struct snd_soc_pcm_runtime *rtd = substream->private_data;
  
  	/* check the jack status at stream startup */
  	corgi_ext_control(&rtd->card->dapm);
  
  	return 0;
  }
  
  /* we need to unmute the HP at shutdown as the mute burns power on corgi */
  static void corgi_shutdown(struct snd_pcm_substream *substream)
  {
  	/* set = unmute headphone */
  	gpio_set_value(CORGI_GPIO_MUTE_L, 1);
  	gpio_set_value(CORGI_GPIO_MUTE_R, 1);
  }
  
  static int corgi_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 corgi_ops = {
  	.startup = corgi_startup,
  	.hw_params = corgi_hw_params,
  	.shutdown = corgi_shutdown,
  };
  
  static int corgi_get_jack(struct snd_kcontrol *kcontrol,
  	struct snd_ctl_elem_value *ucontrol)
  {
  	ucontrol->value.integer.value[0] = corgi_jack_func;
  	return 0;
  }
  
  static int corgi_set_jack(struct snd_kcontrol *kcontrol,
  	struct snd_ctl_elem_value *ucontrol)
  {
  	struct snd_soc_card *card = snd_kcontrol_chip(kcontrol);
  
  	if (corgi_jack_func == ucontrol->value.integer.value[0])
  		return 0;
  
  	corgi_jack_func = ucontrol->value.integer.value[0];
  	corgi_ext_control(&card->dapm);
  	return 1;
  }
  
  static int corgi_get_spk(struct snd_kcontrol *kcontrol,
  	struct snd_ctl_elem_value *ucontrol)
  {
  	ucontrol->value.integer.value[0] = corgi_spk_func;
  	return 0;
  }
  
  static int corgi_set_spk(struct snd_kcontrol *kcontrol,
  	struct snd_ctl_elem_value *ucontrol)
  {
  	struct snd_soc_card *card =  snd_kcontrol_chip(kcontrol);
  
  	if (corgi_spk_func == ucontrol->value.integer.value[0])
  		return 0;
  
  	corgi_spk_func = ucontrol->value.integer.value[0];
  	corgi_ext_control(&card->dapm);
  	return 1;
  }
  
  static int corgi_amp_event(struct snd_soc_dapm_widget *w,
  	struct snd_kcontrol *k, int event)
  {
  	gpio_set_value(CORGI_GPIO_APM_ON, SND_SOC_DAPM_EVENT_ON(event));
  	return 0;
  }
  
  static int corgi_mic_event(struct snd_soc_dapm_widget *w,
  	struct snd_kcontrol *k, int event)
  {
  	gpio_set_value(CORGI_GPIO_MIC_BIAS, SND_SOC_DAPM_EVENT_ON(event));
  	return 0;
  }
  
  /* corgi machine dapm widgets */
  static const struct snd_soc_dapm_widget wm8731_dapm_widgets[] = {
  SND_SOC_DAPM_HP("Headphone Jack", NULL),
  SND_SOC_DAPM_MIC("Mic Jack", corgi_mic_event),
  SND_SOC_DAPM_SPK("Ext Spk", corgi_amp_event),
  SND_SOC_DAPM_LINE("Line Jack", NULL),
  SND_SOC_DAPM_HP("Headset Jack", NULL),
  };
  
  /* Corgi machine audio map (connections to the codec pins) */
  static const struct snd_soc_dapm_route corgi_audio_map[] = {
  
  	/* headset Jack  - in = micin, out = LHPOUT*/
  	{"Headset Jack", NULL, "LHPOUT"},
  
  	/* 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"},
  
  	/* mic is connected to MICIN (via right channel of headphone jack) */
  	{"MICIN", NULL, "Mic Jack"},
  
  	/* Same as the above but no mic bias for line signals */
  	{"MICIN", NULL, "Line Jack"},
  };
  
  static const char *jack_function[] = {"Headphone", "Mic", "Line", "Headset",
  	"Off"};
  static const char *spk_function[] = {"On", "Off"};
  static const struct soc_enum corgi_enum[] = {
  	SOC_ENUM_SINGLE_EXT(5, jack_function),
  	SOC_ENUM_SINGLE_EXT(2, spk_function),
  };
  
  static const struct snd_kcontrol_new wm8731_corgi_controls[] = {
  	SOC_ENUM_EXT("Jack Function", corgi_enum[0], corgi_get_jack,
  		corgi_set_jack),
  	SOC_ENUM_EXT("Speaker Function", corgi_enum[1], corgi_get_spk,
  		corgi_set_spk),
  };
  
  /* corgi digital audio interface glue - connects codec <--> CPU */
  static struct snd_soc_dai_link corgi_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",
  	.dai_fmt = SND_SOC_DAIFMT_I2S | SND_SOC_DAIFMT_NB_NF |
  		   SND_SOC_DAIFMT_CBS_CFS,
  	.ops = &corgi_ops,
  };
  
  /* corgi audio machine driver */
  static struct snd_soc_card corgi = {
  	.name = "Corgi",
  	.owner = THIS_MODULE,
  	.dai_link = &corgi_dai,
  	.num_links = 1,
  
  	.controls = wm8731_corgi_controls,
  	.num_controls = ARRAY_SIZE(wm8731_corgi_controls),
  	.dapm_widgets = wm8731_dapm_widgets,
  	.num_dapm_widgets = ARRAY_SIZE(wm8731_dapm_widgets),
  	.dapm_routes = corgi_audio_map,
  	.num_dapm_routes = ARRAY_SIZE(corgi_audio_map),
  	.fully_routed = true,
  };
  
  static int corgi_probe(struct platform_device *pdev)
  {
  	struct snd_soc_card *card = &corgi;
  	int ret;
  
  	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 corgi_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 corgi_driver = {
  	.driver		= {
  		.name	= "corgi-audio",
  		.pm     = &snd_soc_pm_ops,
  	},
  	.probe		= corgi_probe,
  	.remove		= corgi_remove,
  };
  
  module_platform_driver(corgi_driver);
  
  /* Module information */
  MODULE_AUTHOR("Richard Purdie");
  MODULE_DESCRIPTION("ALSA SoC Corgi");
  MODULE_LICENSE("GPL");
  MODULE_ALIAS("platform:corgi-audio");
  