/*
 * wm9705.c  --  ALSA Soc WM9705 codec support
 *
 * Copyright 2008 Ian Molton <spyro@f2s.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; Version 2 of the  License only.
 *
 */

#include <linux/init.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/device.h>
#include <linux/regmap.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/ac97_codec.h>
#include <sound/initval.h>
#include <sound/soc.h>

#include "wm9705.h"

#define WM9705_VENDOR_ID 0x574d4c05
#define WM9705_VENDOR_ID_MASK 0xffffffff

static const struct reg_default wm9705_reg_defaults[] = {
	{ 0x02, 0x8000 },
	{ 0x04, 0x8000 },
	{ 0x06, 0x8000 },
	{ 0x0a, 0x8000 },
	{ 0x0c, 0x8008 },
	{ 0x0e, 0x8008 },
	{ 0x10, 0x8808 },
	{ 0x12, 0x8808 },
	{ 0x14, 0x8808 },
	{ 0x16, 0x8808 },
	{ 0x18, 0x8808 },
	{ 0x1a, 0x0000 },
	{ 0x1c, 0x8000 },
	{ 0x20, 0x0000 },
	{ 0x22, 0x0000 },
	{ 0x26, 0x000f },
	{ 0x28, 0x0605 },
	{ 0x2a, 0x0000 },
	{ 0x2c, 0xbb80 },
	{ 0x32, 0xbb80 },
	{ 0x34, 0x2000 },
	{ 0x5a, 0x0000 },
	{ 0x5c, 0x0000 },
	{ 0x72, 0x0808 },
	{ 0x74, 0x0000 },
	{ 0x76, 0x0006 },
	{ 0x78, 0x0000 },
	{ 0x7a, 0x0000 },
};

static const struct regmap_config wm9705_regmap_config = {
	.reg_bits = 16,
	.reg_stride = 2,
	.val_bits = 16,
	.max_register = 0x7e,
	.cache_type = REGCACHE_RBTREE,

	.volatile_reg = regmap_ac97_default_volatile,

	.reg_defaults = wm9705_reg_defaults,
	.num_reg_defaults = ARRAY_SIZE(wm9705_reg_defaults),
};

static const struct snd_kcontrol_new wm9705_snd_ac97_controls[] = {
	SOC_DOUBLE("Master Playback Volume", AC97_MASTER, 8, 0, 31, 1),
	SOC_SINGLE("Master Playback Switch", AC97_MASTER, 15, 1, 1),
	SOC_DOUBLE("Headphone Playback Volume", AC97_HEADPHONE, 8, 0, 31, 1),
	SOC_SINGLE("Headphone Playback Switch", AC97_HEADPHONE, 15, 1, 1),
	SOC_DOUBLE("PCM Playback Volume", AC97_PCM, 8, 0, 31, 1),
	SOC_SINGLE("PCM Playback Switch", AC97_PCM, 15, 1, 1),
	SOC_SINGLE("Mono Playback Volume", AC97_MASTER_MONO, 0, 31, 1),
	SOC_SINGLE("Mono Playback Switch", AC97_MASTER_MONO, 15, 1, 1),
	SOC_SINGLE("PCBeep Playback Volume", AC97_PC_BEEP, 1, 15, 1),
	SOC_SINGLE("Phone Playback Volume", AC97_PHONE, 0, 31, 1),
	SOC_DOUBLE("Line Playback Volume", AC97_LINE, 8, 0, 31, 1),
	SOC_DOUBLE("CD Playback Volume", AC97_CD, 8, 0, 31, 1),
	SOC_SINGLE("Mic Playback Volume", AC97_MIC, 0, 31, 1),
	SOC_SINGLE("Mic 20dB Boost Switch", AC97_MIC, 6, 1, 0),
	SOC_DOUBLE("Capture Volume", AC97_REC_GAIN, 8, 0, 15, 0),
	SOC_SINGLE("Capture Switch", AC97_REC_GAIN, 15, 1, 1),
};

static const char *wm9705_mic[] = {"Mic 1", "Mic 2"};
static const char *wm9705_rec_sel[] = {"Mic", "CD", "NC", "NC",
	"Line", "Stereo Mix", "Mono Mix", "Phone"};

static SOC_ENUM_SINGLE_DECL(wm9705_enum_mic,
			    AC97_GENERAL_PURPOSE, 8, wm9705_mic);
static SOC_ENUM_SINGLE_DECL(wm9705_enum_rec_l,
			    AC97_REC_SEL, 8, wm9705_rec_sel);
static SOC_ENUM_SINGLE_DECL(wm9705_enum_rec_r,
			    AC97_REC_SEL, 0, wm9705_rec_sel);

/* Headphone Mixer */
static const struct snd_kcontrol_new wm9705_hp_mixer_controls[] = {
	SOC_DAPM_SINGLE("PCBeep Playback Switch", AC97_PC_BEEP, 15, 1, 1),
	SOC_DAPM_SINGLE("CD Playback Switch", AC97_CD, 15, 1, 1),
	SOC_DAPM_SINGLE("Mic Playback Switch", AC97_MIC, 15, 1, 1),
	SOC_DAPM_SINGLE("Phone Playback Switch", AC97_PHONE, 15, 1, 1),
	SOC_DAPM_SINGLE("Line Playback Switch", AC97_LINE, 15, 1, 1),
};

/* Mic source */
static const struct snd_kcontrol_new wm9705_mic_src_controls =
	SOC_DAPM_ENUM("Route", wm9705_enum_mic);

/* Capture source */
static const struct snd_kcontrol_new wm9705_capture_selectl_controls =
	SOC_DAPM_ENUM("Route", wm9705_enum_rec_l);
static const struct snd_kcontrol_new wm9705_capture_selectr_controls =
	SOC_DAPM_ENUM("Route", wm9705_enum_rec_r);

/* DAPM widgets */
static const struct snd_soc_dapm_widget wm9705_dapm_widgets[] = {
	SND_SOC_DAPM_MUX("Mic Source", SND_SOC_NOPM, 0, 0,
		&wm9705_mic_src_controls),
	SND_SOC_DAPM_MUX("Left Capture Source", SND_SOC_NOPM, 0, 0,
		&wm9705_capture_selectl_controls),
	SND_SOC_DAPM_MUX("Right Capture Source", SND_SOC_NOPM, 0, 0,
		&wm9705_capture_selectr_controls),
	SND_SOC_DAPM_DAC("Left DAC", "Left HiFi Playback",
		SND_SOC_NOPM, 0, 0),
	SND_SOC_DAPM_DAC("Right DAC", "Right HiFi Playback",
		SND_SOC_NOPM, 0, 0),
	SND_SOC_DAPM_MIXER_NAMED_CTL("HP Mixer", SND_SOC_NOPM, 0, 0,
		&wm9705_hp_mixer_controls[0],
		ARRAY_SIZE(wm9705_hp_mixer_controls)),
	SND_SOC_DAPM_MIXER("Mono Mixer", SND_SOC_NOPM, 0, 0, NULL, 0),
	SND_SOC_DAPM_ADC("Left ADC", "Left HiFi Capture", SND_SOC_NOPM, 0, 0),
	SND_SOC_DAPM_ADC("Right ADC", "Right HiFi Capture", SND_SOC_NOPM, 0, 0),
	SND_SOC_DAPM_PGA("Headphone PGA", SND_SOC_NOPM, 0, 0, NULL, 0),
	SND_SOC_DAPM_PGA("Speaker PGA", SND_SOC_NOPM, 0, 0, NULL, 0),
	SND_SOC_DAPM_PGA("Line PGA", SND_SOC_NOPM, 0, 0, NULL, 0),
	SND_SOC_DAPM_PGA("Line out PGA", SND_SOC_NOPM, 0, 0, NULL, 0),
	SND_SOC_DAPM_PGA("Mono PGA", SND_SOC_NOPM, 0, 0, NULL, 0),
	SND_SOC_DAPM_PGA("Phone PGA", SND_SOC_NOPM, 0, 0, NULL, 0),
	SND_SOC_DAPM_PGA("Mic PGA", SND_SOC_NOPM, 0, 0, NULL, 0),
	SND_SOC_DAPM_PGA("PCBEEP PGA", SND_SOC_NOPM, 0, 0, NULL, 0),
	SND_SOC_DAPM_PGA("CD PGA", SND_SOC_NOPM, 0, 0, NULL, 0),
	SND_SOC_DAPM_PGA("ADC PGA", SND_SOC_NOPM, 0, 0, NULL, 0),
	SND_SOC_DAPM_OUTPUT("HPOUTL"),
	SND_SOC_DAPM_OUTPUT("HPOUTR"),
	SND_SOC_DAPM_OUTPUT("LOUT"),
	SND_SOC_DAPM_OUTPUT("ROUT"),
	SND_SOC_DAPM_OUTPUT("MONOOUT"),
	SND_SOC_DAPM_INPUT("PHONE"),
	SND_SOC_DAPM_INPUT("LINEINL"),
	SND_SOC_DAPM_INPUT("LINEINR"),
	SND_SOC_DAPM_INPUT("CDINL"),
	SND_SOC_DAPM_INPUT("CDINR"),
	SND_SOC_DAPM_INPUT("PCBEEP"),
	SND_SOC_DAPM_INPUT("MIC1"),
	SND_SOC_DAPM_INPUT("MIC2"),
};

/* Audio map
 * WM9705 has no switches to disable the route from the inputs to the HP mixer
 * so in order to prevent active inputs from forcing the audio outputs to be
 * constantly enabled, we use the mutes on those inputs to simulate such
 * controls.
 */
static const struct snd_soc_dapm_route wm9705_audio_map[] = {
	/* HP mixer */
	{"HP Mixer", "PCBeep Playback Switch", "PCBEEP PGA"},
	{"HP Mixer", "CD Playback Switch", "CD PGA"},
	{"HP Mixer", "Mic Playback Switch", "Mic PGA"},
	{"HP Mixer", "Phone Playback Switch", "Phone PGA"},
	{"HP Mixer", "Line Playback Switch", "Line PGA"},
	{"HP Mixer", NULL, "Left DAC"},
	{"HP Mixer", NULL, "Right DAC"},

	/* mono mixer */
	{"Mono Mixer", NULL, "HP Mixer"},

	/* outputs */
	{"Headphone PGA", NULL, "HP Mixer"},
	{"HPOUTL", NULL, "Headphone PGA"},
	{"HPOUTR", NULL, "Headphone PGA"},
	{"Line out PGA", NULL, "HP Mixer"},
	{"LOUT", NULL, "Line out PGA"},
	{"ROUT", NULL, "Line out PGA"},
	{"Mono PGA", NULL, "Mono Mixer"},
	{"MONOOUT", NULL, "Mono PGA"},

	/* inputs */
	{"CD PGA", NULL, "CDINL"},
	{"CD PGA", NULL, "CDINR"},
	{"Line PGA", NULL, "LINEINL"},
	{"Line PGA", NULL, "LINEINR"},
	{"Phone PGA", NULL, "PHONE"},
	{"Mic Source", "Mic 1", "MIC1"},
	{"Mic Source", "Mic 2", "MIC2"},
	{"Mic PGA", NULL, "Mic Source"},
	{"PCBEEP PGA", NULL, "PCBEEP"},

	/* Left capture selector */
	{"Left Capture Source", "Mic", "Mic Source"},
	{"Left Capture Source", "CD", "CDINL"},
	{"Left Capture Source", "Line", "LINEINL"},
	{"Left Capture Source", "Stereo Mix", "HP Mixer"},
	{"Left Capture Source", "Mono Mix", "HP Mixer"},
	{"Left Capture Source", "Phone", "PHONE"},

	/* Right capture source */
	{"Right Capture Source", "Mic", "Mic Source"},
	{"Right Capture Source", "CD", "CDINR"},
	{"Right Capture Source", "Line", "LINEINR"},
	{"Right Capture Source", "Stereo Mix", "HP Mixer"},
	{"Right Capture Source", "Mono Mix", "HP Mixer"},
	{"Right Capture Source", "Phone", "PHONE"},

	{"ADC PGA", NULL, "Left Capture Source"},
	{"ADC PGA", NULL, "Right Capture Source"},

	/* ADC's */
	{"Left ADC",  NULL, "ADC PGA"},
	{"Right ADC", NULL, "ADC PGA"},
};

static unsigned int ac97_read(struct snd_soc_codec *codec, unsigned int reg)
{
	return snd_soc_read(codec, reg);
}

static int ac97_write(struct snd_soc_codec *codec, unsigned int reg,
	unsigned int val)
{
	return snd_soc_write(codec, reg, val);
}

static int ac97_prepare(struct snd_pcm_substream *substream,
			struct snd_soc_dai *dai)
{
	struct snd_soc_codec *codec = dai->codec;
	int reg;
	u16 vra;

	vra = ac97_read(codec, AC97_EXTENDED_STATUS);
	ac97_write(codec, AC97_EXTENDED_STATUS, vra | 0x1);

	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
		reg = AC97_PCM_FRONT_DAC_RATE;
	else
		reg = AC97_PCM_LR_ADC_RATE;

	return ac97_write(codec, reg, substream->runtime->rate);
}

#define WM9705_AC97_RATES (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 | \
			SNDRV_PCM_RATE_16000 | SNDRV_PCM_RATE_22050 | \
			SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 | \
			SNDRV_PCM_RATE_48000)

static const struct snd_soc_dai_ops wm9705_dai_ops = {
	.prepare	= ac97_prepare,
};

static struct snd_soc_dai_driver wm9705_dai[] = {
	{
		.name = "wm9705-hifi",
		.playback = {
			.stream_name = "HiFi Playback",
			.channels_min = 1,
			.channels_max = 2,
			.rates = WM9705_AC97_RATES,
			.formats = SND_SOC_STD_AC97_FMTS,
		},
		.capture = {
			.stream_name = "HiFi Capture",
			.channels_min = 1,
			.channels_max = 2,
			.rates = WM9705_AC97_RATES,
			.formats = SND_SOC_STD_AC97_FMTS,
		},
		.ops = &wm9705_dai_ops,
	},
	{
		.name = "wm9705-aux",
		.playback = {
			.stream_name = "Aux Playback",
			.channels_min = 1,
			.channels_max = 1,
			.rates = WM9705_AC97_RATES,
			.formats = SNDRV_PCM_FMTBIT_S16_LE,
		},
	}
};

#ifdef CONFIG_PM
static int wm9705_soc_suspend(struct snd_soc_codec *codec)
{
	regcache_cache_bypass(codec->component.regmap, true);
	ac97_write(codec, AC97_POWERDOWN, 0xffff);
	regcache_cache_bypass(codec->component.regmap, false);

	return 0;
}

static int wm9705_soc_resume(struct snd_soc_codec *codec)
{
	struct snd_ac97 *ac97 = snd_soc_codec_get_drvdata(codec);
	int ret;

	ret = snd_ac97_reset(ac97, true, WM9705_VENDOR_ID,
		WM9705_VENDOR_ID_MASK);
	if (ret < 0)
		return ret;

	regcache_sync(codec->component.regmap);

	return 0;
}
#else
#define wm9705_soc_suspend NULL
#define wm9705_soc_resume NULL
#endif

static int wm9705_soc_probe(struct snd_soc_codec *codec)
{
	struct snd_ac97 *ac97;
	struct regmap *regmap;
	int ret;

	ac97 = snd_soc_new_ac97_codec(codec, WM9705_VENDOR_ID,
		WM9705_VENDOR_ID_MASK);
	if (IS_ERR(ac97)) {
		dev_err(codec->dev, "Failed to register AC97 codec\n");
		return PTR_ERR(ac97);
	}

	regmap = regmap_init_ac97(ac97, &wm9705_regmap_config);
	if (IS_ERR(regmap)) {
		ret = PTR_ERR(regmap);
		goto err_free_ac97_codec;
	}

	snd_soc_codec_set_drvdata(codec, ac97);
	snd_soc_codec_init_regmap(codec, regmap);

	return 0;
err_free_ac97_codec:
	snd_soc_free_ac97_codec(ac97);
	return ret;
}

static int wm9705_soc_remove(struct snd_soc_codec *codec)
{
	struct snd_ac97 *ac97 = snd_soc_codec_get_drvdata(codec);

	snd_soc_codec_exit_regmap(codec);
	snd_soc_free_ac97_codec(ac97);
	return 0;
}

static const struct snd_soc_codec_driver soc_codec_dev_wm9705 = {
	.probe = 	wm9705_soc_probe,
	.remove = 	wm9705_soc_remove,
	.suspend =	wm9705_soc_suspend,
	.resume =	wm9705_soc_resume,

	.component_driver = {
		.controls		= wm9705_snd_ac97_controls,
		.num_controls		= ARRAY_SIZE(wm9705_snd_ac97_controls),
		.dapm_widgets		= wm9705_dapm_widgets,
		.num_dapm_widgets	= ARRAY_SIZE(wm9705_dapm_widgets),
		.dapm_routes		= wm9705_audio_map,
		.num_dapm_routes	= ARRAY_SIZE(wm9705_audio_map),
	},
};

static int wm9705_probe(struct platform_device *pdev)
{
	return snd_soc_register_codec(&pdev->dev,
			&soc_codec_dev_wm9705, wm9705_dai, ARRAY_SIZE(wm9705_dai));
}

static int wm9705_remove(struct platform_device *pdev)
{
	snd_soc_unregister_codec(&pdev->dev);
	return 0;
}

static struct platform_driver wm9705_codec_driver = {
	.driver = {
			.name = "wm9705-codec",
	},

	.probe = wm9705_probe,
	.remove = wm9705_remove,
};

module_platform_driver(wm9705_codec_driver);

MODULE_DESCRIPTION("ASoC WM9705 driver");
MODULE_AUTHOR("Ian Molton");
MODULE_LICENSE("GPL v2");