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/*
 * soc-io.c  --  ASoC register I/O helpers
 *
 * Copyright 2009-2011 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 as published by the
 *  Free Software Foundation;  either version 2 of the  License, or (at your
 *  option) any later version.
 */

#include <linux/i2c.h>
#include <linux/spi/spi.h>
#include <linux/regmap.h>
#include <linux/export.h>
#include <sound/soc.h>

/**
 * snd_soc_component_read() - Read register value
 * @component: Component to read from
 * @reg: Register to read
 * @val: Pointer to where the read value is stored
 *
 * Return: 0 on success, a negative error code otherwise.
 */
int snd_soc_component_read(struct snd_soc_component *component,
	unsigned int reg, unsigned int *val)
{
	int ret;

	if (component->regmap)
		ret = regmap_read(component->regmap, reg, val);
	else if (component->read)
		ret = component->read(component, reg, val);
	else
		ret = -EIO;

	return ret;
}
EXPORT_SYMBOL_GPL(snd_soc_component_read);

/**
 * snd_soc_component_write() - Write register value
 * @component: Component to write to
 * @reg: Register to write
 * @val: Value to write to the register
 *
 * Return: 0 on success, a negative error code otherwise.
 */
int snd_soc_component_write(struct snd_soc_component *component,
	unsigned int reg, unsigned int val)
{
	if (component->regmap)
		return regmap_write(component->regmap, reg, val);
	else if (component->write)
		return component->write(component, reg, val);
	else
		return -EIO;
}
EXPORT_SYMBOL_GPL(snd_soc_component_write);

static int snd_soc_component_update_bits_legacy(
	struct snd_soc_component *component, unsigned int reg,
	unsigned int mask, unsigned int val, bool *change)
{
	unsigned int old, new;
	int ret;

	if (!component->read || !component->write)
		return -EIO;

	mutex_lock(&component->io_mutex);