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/*
 * ak4642.c  --  AK4642/AK4643 ALSA Soc Audio driver
 *
 * Copyright (C) 2009 Renesas Solutions Corp.
 * Kuninori Morimoto <morimoto.kuninori@renesas.com>
 *
 * Based on wm8731.c by Richard Purdie
 * Based on ak4535.c by Richard Purdie
 * Based on wm8753.c by Liam Girdwood
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

/* ** CAUTION **
 *
 * This is very simple driver.
 * It can use headphone output / stereo input only
 *
 * AK4642 is not tested.
 * AK4643 is tested.
 */

#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/pm.h>
#include <linux/i2c.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>
#include <sound/soc-dapm.h>
#include <sound/initval.h>

#include "ak4642.h"

#define AK4642_VERSION "0.0.1"

#define PW_MGMT1	0x00
#define PW_MGMT2	0x01
#define SG_SL1		0x02
#define SG_SL2		0x03
#define MD_CTL1		0x04
#define MD_CTL2		0x05
#define TIMER		0x06
#define ALC_CTL1	0x07
#define ALC_CTL2	0x08
#define L_IVC		0x09
#define L_DVC		0x0a
#define ALC_CTL3	0x0b
#define R_IVC		0x0c
#define R_DVC		0x0d
#define MD_CTL3		0x0e
#define MD_CTL4		0x0f
#define PW_MGMT3	0x10
#define DF_S		0x11
#define FIL3_0		0x12
#define FIL3_1		0x13
#define FIL3_2		0x14
#define FIL3_3		0x15
#define EQ_0		0x16
#define EQ_1		0x17
#define EQ_2		0x18
#define EQ_3		0x19
#define EQ_4		0x1a
#define EQ_5		0x1b
#define FIL1_0		0x1c
#define FIL1_1		0x1d
#define FIL1_2		0x1e
#define FIL1_3		0x1f
#define PW_MGMT4	0x20
#define MD_CTL5		0x21
#define LO_MS		0x22
#define HP_MS		0x23
#define SPK_MS		0x24

#define AK4642_CACHEREGNUM 	0x25

/* PW_MGMT2 */
#define HPMTN		(1 << 6)
#define PMHPL		(1 << 5)
#define PMHPR		(1 << 4)
#define MS		(1 << 3) /* master/slave select */
#define MCKO		(1 << 1)
#define PMPLL		(1 << 0)

#define PMHP_MASK	(PMHPL | PMHPR)
#define PMHP		PMHP_MASK

/* MD_CTL1 */
#define PLL3		(1 << 7)
#define PLL2		(1 << 6)
#define PLL1		(1 << 5)
#define PLL0		(1 << 4)
#define PLL_MASK	(PLL3 | PLL2 | PLL1 | PLL0)

#define BCKO_MASK	(1 << 3)
#define BCKO_64		BCKO_MASK

/* MD_CTL2 */
#define FS0		(1 << 0)
#define FS1		(1 << 1)
#define FS2		(1 << 2)
#define FS3		(1 << 5)
#define FS_MASK		(FS0 | FS1 | FS2 | FS3)

struct snd_soc_codec_device soc_codec_dev_ak4642;

/* codec private data */
struct ak4642_priv {
	struct snd_soc_codec codec;
};

static struct snd_soc_codec *ak4642_codec;

/*
 * ak4642 register cache
 */
static const u16 ak4642_reg[AK4642_CACHEREGNUM] = {
	0x0000, 0x0000, 0x0001, 0x0000,
	0x0002, 0x0000, 0x0000, 0x0000,
	0x00e1, 0x00e1, 0x0018, 0x0000,
	0x00e1, 0x0018, 0x0011, 0x0008,
	0x0000, 0x0000, 0x0000, 0x0000,
	0x0000, 0x0000, 0x0000, 0x0000,
	0x0000, 0x0000, 0x0000, 0x0000,
	0x0000, 0x0000, 0x0000, 0x0000,
	0x0000, 0x0000, 0x0000, 0x0000,
	0x0000,
};

/*
 * read ak4642 register cache
 */
static inline unsigned int ak4642_read_reg_cache(struct snd_soc_codec *codec,
	unsigned int reg)
{
	u16 *cache = codec->reg_cache;
	if (reg >= AK4642_CACHEREGNUM)
		return -1;
	return cache[reg];
}

/*
 * write ak4642 register cache
 */
static inline void ak4642_write_reg_cache(struct snd_soc_codec *codec,
	u16 reg, unsigned int value)
{
	u16 *cache = codec->reg_cache;
	if (reg >= AK4642_CACHEREGNUM)
		return;

	cache[reg] = value;
}

/*
 * write to the AK4642 register space
 */
static int ak4642_write(struct snd_soc_codec *codec, unsigned int reg,
	unsigned int value)
{
	u8 data[2];

	/* data is
	 *   D15..D8 AK4642 register offset
	 *   D7...D0 register data
	 */
	data[0] = reg & 0xff;
	data[1] = value & 0xff;

	if (codec->hw_write(codec->control_data, data, 2) == 2) {
		ak4642_write_reg_cache(codec, reg, value);
		return 0;
	} else
		return -EIO;
}

static int ak4642_sync(struct snd_soc_codec *codec)
{
	u16 *cache = codec->reg_cache;
	int i, r = 0;

	for (i = 0; i < AK4642_CACHEREGNUM; i++)
		r |= ak4642_write(codec, i, cache[i]);

	return r;
};

static int ak4642_dai_startup(struct snd_pcm_substream *substream,
			      struct snd_soc_dai *dai)