/*
 * ALSA SoC CQ0093 Voice Codec Driver for DaVinci platforms
 *
 * Copyright (C) 2010 Texas Instruments, Inc
 *
 * Author: Miguel Aguilar <miguel.aguilar@ridgerun.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.
 *
 * 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/init.h>
#include <linux/io.h>
#include <linux/delay.h>
#include <linux/pm.h>
#include <linux/platform_device.h>
#include <linux/device.h>
#include <linux/slab.h>
#include <linux/clk.h>
#include <linux/mfd/davinci_voicecodec.h>

#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>
#include <sound/soc-dai.h>
#include <sound/soc-dapm.h>
#include <sound/initval.h>

#include <mach/dm365.h>

#include "cq93vc.h"

static inline unsigned int cq93vc_read(struct snd_soc_codec *codec,
						unsigned int reg)
{
	struct davinci_vc *davinci_vc = codec->control_data;

	return readl(davinci_vc->base + reg);
}

static inline int cq93vc_write(struct snd_soc_codec *codec, unsigned int reg,
		       unsigned int value)
{
	struct davinci_vc *davinci_vc = codec->control_data;

	writel(value, davinci_vc->base + reg);

	return 0;
}

static const struct snd_kcontrol_new cq93vc_snd_controls[] = {
	SOC_SINGLE("PGA Capture Volume", DAVINCI_VC_REG05, 0, 0x03, 0),
	SOC_SINGLE("Mono DAC Playback Volume", DAVINCI_VC_REG09, 0, 0x3f, 0),
};

static int cq93vc_mute(struct snd_soc_dai *dai, int mute)
{
	struct snd_soc_codec *codec = dai->codec;
	u8 reg = cq93vc_read(codec, DAVINCI_VC_REG09) & ~DAVINCI_VC_REG09_MUTE;

	if (mute)
		cq93vc_write(codec, DAVINCI_VC_REG09,
			     reg | DAVINCI_VC_REG09_MUTE);
	else
		cq93vc_write(codec, DAVINCI_VC_REG09, reg);

	return 0;
}

static int cq93vc_set_dai_sysclk(struct snd_soc_dai *codec_dai,
				 int clk_id, unsigned int freq, int dir)
{
	struct snd_soc_codec *codec = codec_dai->codec;
	struct davinci_vc *davinci_vc = codec->control_data;

	switch (freq) {
	case 22579200:
	case 27000000:
	case 33868800:
		davinci_vc->cq93vc.sysclk = freq;
		return 0;
	}

	return -EINVAL;
}

static int cq93vc_set_bias_level(struct snd_soc_codec *codec,
				enum snd_soc_bias_level level)
{
	switch (level) {
	case SND_SOC_BIAS_ON:
		cq93vc_write(codec, DAVINCI_VC_REG12,
			     DAVINCI_VC_REG12_POWER_ALL_ON);
		break;
	case SND_SOC_BIAS_PREPARE:
		break;
	case SND_SOC_BIAS_STANDBY:
		cq93vc_write(codec, DAVINCI_VC_REG12,
			     DAVINCI_VC_REG12_POWER_ALL_OFF);
		break;
	case SND_SOC_BIAS_OFF:
		/* force all power off */
		cq93vc_write(codec, DAVINCI_VC_REG12,
			     DAVINCI_VC_REG12_POWER_ALL_OFF);
		break;
	}
	codec->bias_level = level;

	return 0;
}

#define CQ93VC_RATES	(SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_16000)
#define CQ93VC_FORMATS	(SNDRV_PCM_FMTBIT_U8 | SNDRV_PCM_FMTBIT_S16_LE)

static struct snd_soc_dai_ops cq93vc_dai_ops = {
	.digital_mute	= cq93vc_mute,
	.set_sysclk	= cq93vc_set_dai_sysclk,
};

struct snd_soc_dai cq93vc_dai = {
	.name = "CQ93VC",
	.playback = {
		.stream_name = "Playback",
		.channels_min = 1,
		.channels_max = 2,
		.rates = CQ93VC_RATES,
		.formats = CQ93VC_FORMATS,},
	.capture = {
		.stream_name = "Capture",
		.channels_min = 1,
		.channels_max = 2,
		.rates = CQ93VC_RATES,
		.formats = CQ93VC_FORMATS,},
	.ops = &cq93vc_dai_ops,
};
EXPORT_SYMBOL_GPL(cq93vc_dai);

static int cq93vc_resume(struct platform_device *pdev)
{
	struct snd_soc_device *socdev = platform_get_drvdata(pdev);
	struct snd_soc_codec *codec = socdev->card->codec;

	cq93vc_set_bias_level(codec, SND_SOC_BIAS_STANDBY);

	return 0;
}

static struct snd_soc_codec *cq93vc_codec;

static int cq93vc_probe(struct platform_device *pdev)
{
	struct snd_soc_device *socdev = platform_get_drvdata(pdev);
	struct device *dev = &pdev->dev;
	struct snd_soc_codec *codec;
	int ret;

	socdev->card->codec = cq93vc_codec;
	codec = socdev->card->codec;

	/* Register pcms */
	ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1);
	if (ret < 0) {
		dev_err(dev, "%s: failed to create pcms\n", pdev->name);
		return ret;
	}

	/* Set controls */
	snd_soc_add_controls(codec, cq93vc_snd_controls,
			     ARRAY_SIZE(cq93vc_snd_controls));

	/* Off, with power on */
	cq93vc_set_bias_level(codec, SND_SOC_BIAS_STANDBY);

	return 0;
}

static int cq93vc_remove(struct platform_device *pdev)
{
	struct snd_soc_device *socdev = platform_get_drvdata(pdev);

	snd_soc_free_pcms(socdev);
	snd_soc_dapm_free(socdev);

	return 0;
}

struct snd_soc_codec_device soc_codec_dev_cq93vc = {
	.probe = cq93vc_probe,
	.remove = cq93vc_remove,
	.resume = cq93vc_resume,
};
EXPORT_SYMBOL_GPL(soc_codec_dev_cq93vc);

static __init int cq93vc_codec_probe(struct platform_device *pdev)
{
	struct davinci_vc *davinci_vc = platform_get_drvdata(pdev);
	struct snd_soc_codec *codec;
	int ret;

	codec = kzalloc(sizeof(struct snd_soc_codec), GFP_KERNEL);
	if (codec == NULL) {
		dev_dbg(davinci_vc->dev,
			"could not allocate memory for codec data\n");
		return -ENOMEM;
	}

	davinci_vc->cq93vc.codec = codec;

	cq93vc_dai.dev = &pdev->dev;

	mutex_init(&codec->mutex);
	INIT_LIST_HEAD(&codec->dapm_widgets);
	INIT_LIST_HEAD(&codec->dapm_paths);
	codec->dev = &pdev->dev;
	codec->name = "CQ93VC";
	codec->owner = THIS_MODULE;
	codec->read = cq93vc_read;
	codec->write = cq93vc_write;
	codec->set_bias_level = cq93vc_set_bias_level;
	codec->dai = &cq93vc_dai;
	codec->num_dai = 1;
	codec->control_data = davinci_vc;

	cq93vc_codec = codec;

	ret = snd_soc_register_codec(codec);
	if (ret) {
		dev_err(davinci_vc->dev, "failed to register codec\n");
		goto fail1;
	}

	ret = snd_soc_register_dai(&cq93vc_dai);
	if (ret) {
		dev_err(davinci_vc->dev, "could register dai\n");
		goto fail2;
	}
	return 0;

fail2:
	snd_soc_unregister_codec(codec);

fail1:
	kfree(codec);
	cq93vc_codec = NULL;

	return ret;
}

static int __devexit cq93vc_codec_remove(struct platform_device *pdev)
{
	struct snd_soc_device *socdev = platform_get_drvdata(pdev);
	struct snd_soc_codec *codec = socdev->card->codec;

	snd_soc_unregister_dai(&cq93vc_dai);
	snd_soc_unregister_codec(&codec);

	kfree(codec);
	cq93vc_codec = NULL;

	return 0;
}

static struct platform_driver cq93vc_codec_driver = {
	.driver = {
		   .name = "cq93vc",
		   .owner = THIS_MODULE,
		   },
	.probe = cq93vc_codec_probe,
	.remove = __devexit_p(cq93vc_codec_remove),
};

static __init int cq93vc_init(void)
{
	return platform_driver_probe(&cq93vc_codec_driver, cq93vc_codec_probe);
}
module_init(cq93vc_init);

static __exit void cq93vc_exit(void)
{
	platform_driver_unregister(&cq93vc_codec_driver);
}
module_exit(cq93vc_exit);

MODULE_DESCRIPTION("Texas Instruments DaVinci ASoC CQ0093 Voice Codec Driver");
MODULE_AUTHOR("Miguel Aguilar");
MODULE_LICENSE("GPL");