text: /*
   * sam9g20_wm8731  --  SoC audio for AT91SAM9G20-based
   * 			ATMEL AT91SAM9G20ek board.
   *
   *  Copyright (C) 2005 SAN People
   *  Copyright (C) 2008 Atmel
   *
   * Authors: Sedji Gaouaou <sedji.gaouaou@atmel.com>
   *
   * Based on ati_b1_wm8731.c by:
   * Frank Mandarino <fmandarino@endrelia.com>
   * Copyright 2006 Endrelia Technologies Inc.
   * Based on corgi.c by:
   * Copyright 2005 Wolfson Microelectronics PLC.
   * Copyright 2005 Openedhand Ltd.
   *
   * 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.
   *
   * 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
   */
  
  #include <linux/module.h>
  #include <linux/moduleparam.h>
  #include <linux/kernel.h>
  #include <linux/clk.h>
  #include <linux/timer.h>
  #include <linux/interrupt.h>
  #include <linux/platform_device.h>
  #include <linux/i2c.h>
  #include <linux/of.h>
  
  #include <linux/atmel-ssc.h>
  
  #include <sound/core.h>
  #include <sound/pcm.h>
  #include <sound/pcm_params.h>
  #include <sound/soc.h>
  
  #include <asm/mach-types.h>
  #include <mach/hardware.h>
  
  #include "../codecs/wm8731.h"
  #include "atmel-pcm.h"
  #include "atmel_ssc_dai.h"
  
  #define MCLK_RATE 12000000
  
  /*
   * As shipped the board does not have inputs.  However, it is relatively
   * straightforward to modify the board to hook them up so support is left
   * in the driver.
   */
  #undef ENABLE_MIC_INPUT
  
  static struct clk *mclk;
  
  static int at91sam9g20ek_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 ret;
  
  	/* set codec DAI configuration */
  	ret = snd_soc_dai_set_fmt(codec_dai, SND_SOC_DAIFMT_I2S |
  		SND_SOC_DAIFMT_NB_NF | SND_SOC_DAIFMT_CBM_CFM);
  	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_CBM_CFM);
  	if (ret < 0)
  		return ret;
  
  	return 0;
  }
  
  static struct snd_soc_ops at91sam9g20ek_ops = {
  	.hw_params = at91sam9g20ek_hw_params,
  };
  
  static int at91sam9g20ek_set_bias_level(struct snd_soc_card *card,
  					struct snd_soc_dapm_context *dapm,
  					enum snd_soc_bias_level level)
  {
  	static int mclk_on;
  	int ret = 0;
  
  	switch (level) {
  	case SND_SOC_BIAS_ON:
  	case SND_SOC_BIAS_PREPARE:
  		if (!mclk_on)
  			ret = clk_enable(mclk);
  		if (ret == 0)
  			mclk_on = 1;
  		break;
  
  	case SND_SOC_BIAS_OFF:
  	case SND_SOC_BIAS_STANDBY:
  		if (mclk_on)
  			clk_disable(mclk);
  		mclk_on = 0;
  		break;
  	}
  
  	return ret;
  }
  
  static const struct snd_soc_dapm_widget at91sam9g20ek_dapm_widgets[] = {
  	SND_SOC_DAPM_MIC("Int Mic", NULL),
  	SND_SOC_DAPM_SPK("Ext Spk", NULL),
  };
  
  static const struct snd_soc_dapm_route intercon[] = {
  
  	/* speaker connected to LHPOUT */
  	{"Ext Spk", NULL, "LHPOUT"},
  
  	/* mic is connected to Mic Jack, with WM8731 Mic Bias */
  	{"MICIN", NULL, "Mic Bias"},
  	{"Mic Bias", NULL, "Int Mic"},
  };
  
  /*
   * Logic for a wm8731 as connected on a at91sam9g20ek board.
   */
  static int at91sam9g20ek_wm8731_init(struct snd_soc_pcm_runtime *rtd)
  {
  	struct snd_soc_codec *codec = rtd->codec;
  	struct snd_soc_dai *codec_dai = rtd->codec_dai;
  	struct snd_soc_dapm_context *dapm = &codec->dapm;
  	int ret;
  
  	printk(KERN_DEBUG
  			"at91sam9g20ek_wm8731 "
  			": at91sam9g20ek_wm8731_init() called\n");
  
  	ret = snd_soc_dai_set_sysclk(codec_dai, WM8731_SYSCLK_MCLK,
  		MCLK_RATE, SND_SOC_CLOCK_IN);
  	if (ret < 0) {
  		printk(KERN_ERR "Failed to set WM8731 SYSCLK: %d\n", ret);
  		return ret;
  	}
  
  	/* not connected */
  	snd_soc_dapm_nc_pin(dapm, "RLINEIN");
  	snd_soc_dapm_nc_pin(dapm, "LLINEIN");
  
  #ifndef ENABLE_MIC_INPUT
  	snd_soc_dapm_nc_pin(&rtd->card->dapm, "Int Mic");
  #endif
  
  	return 0;
  }
  
  static struct snd_soc_dai_link at91sam9g20ek_dai = {
  	.name = "WM8731",
  	.stream_name = "WM8731 PCM",
  	.cpu_dai_name = "at91rm9200_ssc.0",
  	.codec_dai_name = "wm8731-hifi",
  	.init = at91sam9g20ek_wm8731_init,
  	.platform_name = "at91rm9200_ssc.0",
  	.codec_name = "wm8731.0-001b",
  	.ops = &at91sam9g20ek_ops,
  };
  
  static struct snd_soc_card snd_soc_at91sam9g20ek = {
  	.name = "AT91SAMG20-EK",
  	.owner = THIS_MODULE,
  	.dai_link = &at91sam9g20ek_dai,
  	.num_links = 1,
  	.set_bias_level = at91sam9g20ek_set_bias_level,
  
  	.dapm_widgets = at91sam9g20ek_dapm_widgets,
  	.num_dapm_widgets = ARRAY_SIZE(at91sam9g20ek_dapm_widgets),
  	.dapm_routes = intercon,
  	.num_dapm_routes = ARRAY_SIZE(intercon),
  };
  
  static int at91sam9g20ek_audio_probe(struct platform_device *pdev)
  {
  	struct device_node *np = pdev->dev.of_node;
  	struct device_node *codec_np, *cpu_np;
  	struct clk *pllb;
  	struct snd_soc_card *card = &snd_soc_at91sam9g20ek;
  	int ret;
  
  	if (!np) {
  		if (!(machine_is_at91sam9g20ek() ||
  			machine_is_at91sam9g20ek_2mmc()))
  			return -ENODEV;
  	}
  
  	ret = atmel_ssc_set_audio(0);
  	if (ret) {
  		dev_err(&pdev->dev, "ssc channel is not valid\n");
  		return -EINVAL;
  	}
  
  	/*
  	 * Codec MCLK is supplied by PCK0 - set it up.
  	 */
  	mclk = clk_get(NULL, "pck0");
  	if (IS_ERR(mclk)) {
  		printk(KERN_ERR "ASoC: Failed to get MCLK\n");
  		ret = PTR_ERR(mclk);
  		goto err;
  	}
  
  	pllb = clk_get(NULL, "pllb");
  	if (IS_ERR(pllb)) {
  		printk(KERN_ERR "ASoC: Failed to get PLLB\n");
  		ret = PTR_ERR(pllb);
  		goto err_mclk;
  	}
  	ret = clk_set_parent(mclk, pllb);
  	clk_put(pllb);
  	if (ret != 0) {
  		printk(KERN_ERR "ASoC: Failed to set MCLK parent\n");
  		goto err_mclk;
  	}
  
  	clk_set_rate(mclk, MCLK_RATE);
  
  	card->dev = &pdev->dev;
  
  	/* Parse device node info */
  	if (np) {
  		ret = snd_soc_of_parse_card_name(card, "atmel,model");
  		if (ret)
  			goto err;
  
  		ret = snd_soc_of_parse_audio_routing(card,
  			"atmel,audio-routing");
  		if (ret)
  			goto err;
  
  		/* Parse codec info */
  		at91sam9g20ek_dai.codec_name = NULL;
  		codec_np = of_parse_phandle(np, "atmel,audio-codec", 0);
  		if (!codec_np) {
  			dev_err(&pdev->dev, "codec info missing\n");
  			return -EINVAL;
  		}
  		at91sam9g20ek_dai.codec_of_node = codec_np;
  
  		/* Parse dai and platform info */
  		at91sam9g20ek_dai.cpu_dai_name = NULL;
  		at91sam9g20ek_dai.platform_name = NULL;
  		cpu_np = of_parse_phandle(np, "atmel,ssc-controller", 0);
  		if (!cpu_np) {
  			dev_err(&pdev->dev, "dai and pcm info missing\n");
  			return -EINVAL;
  		}
  		at91sam9g20ek_dai.cpu_of_node = cpu_np;
  		at91sam9g20ek_dai.platform_of_node = cpu_np;
  
  		of_node_put(codec_np);
  		of_node_put(cpu_np);
  	}
  
  	ret = snd_soc_register_card(card);
  	if (ret) {
  		printk(KERN_ERR "ASoC: snd_soc_register_card() failed\n");
  	}
  
  	return ret;
  
  err_mclk:
  	clk_put(mclk);
  	mclk = NULL;
  err:
  	atmel_ssc_put_audio(0);
  	return ret;
  }
  
  static int at91sam9g20ek_audio_remove(struct platform_device *pdev)
  {
  	struct snd_soc_card *card = platform_get_drvdata(pdev);
  
  	clk_disable(mclk);
  	mclk = NULL;
  	snd_soc_unregister_card(card);
  	atmel_ssc_put_audio(0);
  
  	return 0;
  }
  
  #ifdef CONFIG_OF
  static const struct of_device_id at91sam9g20ek_wm8731_dt_ids[] = {
  	{ .compatible = "atmel,at91sam9g20ek-wm8731-audio", },
  	{ }
  };
  MODULE_DEVICE_TABLE(of, at91sam9g20ek_wm8731_dt_ids);
  #endif
  
  static struct platform_driver at91sam9g20ek_audio_driver = {
  	.driver = {
  		.name	= "at91sam9g20ek-audio",
  		.of_match_table = of_match_ptr(at91sam9g20ek_wm8731_dt_ids),
  	},
  	.probe	= at91sam9g20ek_audio_probe,
  	.remove	= at91sam9g20ek_audio_remove,
  };
  
  module_platform_driver(at91sam9g20ek_audio_driver);
  
  /* Module information */
  MODULE_AUTHOR("Sedji Gaouaou <sedji.gaouaou@atmel.com>");
  MODULE_DESCRIPTION("ALSA SoC AT91SAM9G20EK_WM8731");
  MODULE_ALIAS("platform:at91sam9g20ek-audio");
  MODULE_LICENSE("GPL");
  