path: root/sound/soc/codecs/wm8955.c

/*
 * wm8955.c  --  WM8955 ALSA SoC Audio driver
 *
 * Copyright 2009 Wolfson Microelectronics plc
 *
 * Author: Mark Brown <broonie@opensource.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/init.h>
#include <linux/delay.h>
#include <linux/pm.h>
#include <linux/i2c.h>
#include <linux/regulator/consumer.h>
#include <linux/slab.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/pcm_params.h>
#include <sound/soc.h>
#include <sound/initval.h>
#include <sound/tlv.h>
#include <sound/wm8955.h>

#include "wm8955.h"

#define WM8955_NUM_SUPPLIES 4
static const char *wm8955_supply_names[WM8955_NUM_SUPPLIES] = {
	"DCVDD",
	"DBVDD",
	"HPVDD",
	"AVDD",
};

/* codec private data */
struct wm8955_priv {
	enum snd_soc_control_type control_type;

	unsigned int mclk_rate;

	int deemph;
	int fs;

	struct regulator_bulk_data supplies[WM8955_NUM_SUPPLIES];
};

static const u16 wm8955_reg[WM8955_MAX_REGISTER + 1] = {
	0x0000,     /* R0 */
	0x0000,     /* R1 */
	0x0079,     /* R2  - LOUT1 volume */
	0x0079,     /* R3  - ROUT1 volume */
	0x0000,     /* R4 */
	0x0008,     /* R5  - DAC Control */
	0x0000,     /* R6 */
	0x000A,     /* R7  - Audio Interface */
	0x0000,     /* R8  - Sample Rate */
	0x0000,     /* R9 */
	0x00FF,     /* R10 - Left DAC volume */
	0x00FF,     /* R11 - Right DAC volume */
	0x000F,     /* R12 - Bass control */
	0x000F,     /* R13 - Treble control */
	0x0000,     /* R14 */
	0x0000,     /* R15 - Reset */
	0x0000,     /* R16 */
	0x0000,     /* R17 */
	0x0000,     /* R18 */
	0x0000,     /* R19 */
	0x0000,     /* R20 */
	0x0000,     /* R21 */
	0x0000,     /* R22 */
	0x00C1,     /* R23 - Additional control (1) */
	0x0000,     /* R24 - Additional control (2) */
	0x0000,     /* R25 - Power Management (1) */
	0x0000,     /* R26 - Power Management (2) */
	0x0000,     /* R27 - Additional Control (3) */
	0x0000,     /* R28 */
	0x0000,     /* R29 */
	0x0000,     /* R30 */
	0x0000,     /* R31 */
	0x0000,     /* R32 */
	0x0000,     /* R33 */
	0x0050,     /* R34 - Left out Mix (1) */
	0x0050,     /* R35 - Left out Mix (2) */
	0x0050,     /* R36 - Right out Mix (1) */
	0x0050,     /* R37 - Right Out Mix (2) */
	0x0050,     /* R38 - Mono out Mix (1) */
	0x0050,     /* R39 - Mono out Mix (2) */
	0x0079,     /* R40 - LOUT2 volume */
	0x0079,     /* R41 - ROUT2 volume */
	0x0079,     /* R42 - MONOOUT volume */
	0x0000,     /* R43 - Clocking / PLL */
	0x0103,     /* R44 - PLL Control 1 */
	0x0024,     /* R45 - PLL Control 2 */
	0x01BA,     /* R46 - PLL Control 3 */
	0x0000,     /* R47 */
	0x0000,     /* R48 */
	0x0000,     /* R49 */
	0x0000,     /* R50 */
	0x0000,     /* R51 */
	0x0000,     /* R52 */
	0x0000,     /* R53 */
	0x0000,     /* R54 */
	0x0000,     /* R55 */
	0x0000,     /* R56 */
	0x0000,     /* R57 */
	0x0000,     /* R58 */
	0x0000,     /* R59 - PLL Control 4 */
};

static int wm8955_reset(struct snd_soc_codec *codec)
{
	return snd_soc_write(codec, WM8955_RESET, 0);
}

struct pll_factors {
	int n;
	int k;
	int outdiv;
};

/* The size in bits of the FLL divide multiplied by 10
 * to allow rounding later */
#define FIXED_FLL_SIZE ((1 << 22) * 10)

static int wm8995_pll_factors(struct device *dev,
			      int Fref, int Fout, struct pll_factors *pll)
{
	u64 Kpart;
	unsigned int K, Ndiv, Nmod, target;

	dev_dbg(dev, "Fref=%u Fout=%u\n", Fref, Fout);

	/* The oscilator should run at should be 90-100MHz, and
	 * there's a divide by 4 plus an optional divide by 2 in the
	 * output path to generate the system clock.  The clock table
	 * is sortd so we should always generate a suitable target. */
	target = Fout * 4;
	if (target < 90000000) {
		pll->outdiv = 1;
		target *= 2;
	} else {
		pll->outdiv = 0;
	}

	WARN_ON(target < 90000000 || target > 100000000);

	dev_dbg(dev, "Fvco=%dHz\n", target);

	/* Now, calculate N.K */
	Ndiv = target / Fref;

	pll->n = Ndiv;
	Nmod = target % Fref;