path: root/sound/soc/codecs/wm8974.c

/*
 * wm8974.c  --  WM8974 ALSA Soc Audio driver
 *
 * Copyright 2006 Wolfson Microelectronics PLC.
 *
 * Author: Liam Girdwood <linux@wolfsonmicro.com>
 *
 * 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.
 */

#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/version.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/pm.h>
#include <linux/i2c.h>
#include <linux/platform_device.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 <sound/tlv.h>

#include "wm8974.h"

static const u16 wm8974_reg[WM8974_CACHEREGNUM] = {
	0x0000, 0x0000, 0x0000, 0x0000,
	0x0050, 0x0000, 0x0140, 0x0000,
	0x0000, 0x0000, 0x0000, 0x00ff,
	0x0000, 0x0000, 0x0100, 0x00ff,
	0x0000, 0x0000, 0x012c, 0x002c,
	0x002c, 0x002c, 0x002c, 0x0000,
	0x0032, 0x0000, 0x0000, 0x0000,
	0x0000, 0x0000, 0x0000, 0x0000,
	0x0038, 0x000b, 0x0032, 0x0000,
	0x0008, 0x000c, 0x0093, 0x00e9,
	0x0000, 0x0000, 0x0000, 0x0000,
	0x0003, 0x0010, 0x0000, 0x0000,
	0x0000, 0x0002, 0x0000, 0x0000,
	0x0000, 0x0000, 0x0039, 0x0000,
	0x0000,
};

#define WM8974_POWER1_BIASEN  0x08
#define WM8974_POWER1_BUFIOEN 0x10

struct wm8974_priv {
	struct snd_soc_codec codec;
	u16 reg_cache[WM8974_CACHEREGNUM];
};

static struct snd_soc_codec *wm8974_codec;

/*
 * read wm8974 register cache
 */
static inline unsigned int wm8974_read_reg_cache(struct snd_soc_codec *codec,
	unsigned int reg)
{
	u16 *cache = codec->reg_cache;
	if (reg == WM8974_RESET)
		return 0;
	if (reg >= WM8974_CACHEREGNUM)
		return -1;
	return cache[reg];
}

/*
 * write wm8974 register cache
 */
static inline void wm8974_write_reg_cache(struct snd_soc_codec *codec,
	u16 reg, unsigned int value)
{
	u16 *cache = codec->reg_cache;
	if (reg >= WM8974_CACHEREGNUM)
		return;
	cache[reg] = value;
}

/*
 * write to the WM8974 register space
 */
static int wm8974_write(struct snd_soc_codec *codec, unsigned int reg,
	unsigned int value)
{
	u8 data[2];

	/* data is
	 *   D15..D9 WM8974 register offset
	 *   D8...D0 register data
	 */
	data[0] = (reg << 1) | ((value >> 8) & 0x0001);
	data[1] = value & 0x00ff;

	wm8974_write_reg_cache(codec, reg, value);
	if (codec->hw_write(codec->control_data, data, 2) == 2)
		return 0;
	else
		return -EIO;
}

#define wm8974_reset(c)	wm8974_write(c, WM8974_RESET, 0)

static const char *wm8974_companding[] = {"Off", "NC", "u-law", "A-law" };
static const char *wm8974_deemp[] = {"None", "32kHz", "44.1kHz", "48kHz" };
static const char *wm8974_eqmode[] = {"Capture", "Playback" };
static const char *wm8974_bw[] = {"Narrow", "Wide" };
static const char *wm8974_eq1[] = {"80Hz", "105Hz", "135Hz", "175Hz" };
static const char *wm8974_eq2[] = {"230Hz", "300Hz", "385Hz", "500Hz" };
static const char *wm8974_eq3[] = {"650Hz", "850Hz", "1.1kHz", "1.4kHz" };
static const char *wm8974_eq4[] = {"1.8kHz", "2.4kHz", "3.2kHz", "4.1kHz" };
static const char *wm8974_eq5[] = {"5.3kHz", "6.9kHz", "9kHz", "11.7kHz" };
static const char *wm8974_alc[] = {"ALC", "Limiter" };

static const struct soc_enum wm8974_enum[] = {
	SOC_ENUM_SINGLE(WM8974_COMP, 1, 4, wm8974_companding), /* adc */
	SOC_ENUM_SINGLE(WM8974_COMP, 3, 4, wm8974_companding), /* dac */
	SOC_ENUM_SINGLE(WM8974_DAC,  4, 4, wm8974_deemp),
	SOC_ENUM_SINGLE(WM8974_EQ1,  8, 2, wm8974_eqmode),

	SOC_ENUM_SINGLE(WM8974_EQ1,  5, 4, wm8974_eq1),
	SOC_ENUM_SINGLE(WM8974_EQ2,  8, 2, wm8974_bw),
	SOC_ENUM_SINGLE(WM8974_EQ2,  5, 4, wm8974_eq2),
	SOC_ENUM_SINGLE(WM8974_EQ3,  8, 2, wm8974_bw),

	SOC_ENUM_SINGLE(WM8974_EQ3,  5, 4, wm8974_eq3),
	SOC_ENUM_SINGLE(WM8974_EQ4,  8, 2, wm8974_bw),
	SOC_ENUM_SINGLE(WM8974_EQ4,  5, 4, wm8974_eq4),
	SOC_ENUM_SINGLE(WM8974_EQ5,  8, 2, wm8974_bw),

	SOC_ENUM_SINGLE(WM8974_EQ5,  5, 4, wm8974_eq5),
	SOC_ENUM_SINGLE(WM8974_ALC3,  8, 2, wm8974_alc),
};

static const DECLARE_TLV_DB_SCALE(digital_tlv, -12750, 50, 1);
static