/*
* 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>
#include <trace/events/asoc.h>
unsigned int snd_soc_read(struct snd_soc_codec *codec, unsigned int reg)
{
unsigned int ret;
ret = codec->read(codec, reg);
dev_dbg(codec->dev, "read %x => %x\n", reg, ret);
trace_snd_soc_reg_read(codec, reg, ret);
return ret;
}
EXPORT_SYMBOL_GPL(snd_soc_read);
int snd_soc_write(struct snd_soc_codec *codec, unsigned int reg,
unsigned int val)
{
dev_dbg(codec->dev, "write %x = %x\n", reg, val);
trace_snd_soc_reg_write(codec, reg, val);
return codec->write(codec, reg, val);
}
EXPORT_SYMBOL_GPL(snd_soc_write);
/**
* snd_soc_update_bits - update codec register bits
* @codec: audio codec
* @reg: codec register
* @mask: register mask
* @value: new value
*
* Writes new register value.
*
* Returns 1 for change, 0 for no change, or negative error code.
*/
int snd_soc_update_bits(struct snd_soc_codec *codec, unsigned int reg,
unsigned int mask, unsigned int value)
{
bool change;
unsigned int old, new;
int ret;
if (codec->using_regmap) {
ret = regmap_update_bits_check(codec->control_data, reg,
mask, value, &change);
} else {
ret = snd_soc_read(codec, reg);
if (ret < 0)
return ret;
old = ret;
new = (old & ~mask) | (value & mask);
change = old != new;
if (change)
ret = snd_soc_write(codec, reg, new);
}
if (ret < 0)
return ret;
return change;
}
EXPORT_SYMBOL_GPL(snd_soc_update_bits);
/**
* snd_soc_update_bits_locked - update codec register bits
* @codec: audio codec
* @reg: codec register
* @mask: register mask
* @value: new value
*
* Writes new register value, and takes the codec mutex.
*
* Returns 1 for change else 0.
*/
int snd_soc_update_bits_locked(struct snd_soc_codec *codec,
unsigned int reg, unsigned int mask,
unsigned int value)
{
int change;
mutex_lock(&codec->mutex);
change = snd_soc_update_bits(codec, reg, mask, value);
mutex_unlock(&codec->mutex);
return change;
}
EXPORT_SYMBOL_GPL(snd_soc_update_bits_locked);
/**
* snd_soc_test_bits - test register for change
* @codec: audio codec
* @reg: codec register
* @mask: register mask
* @value: new value
*
* Tests a register with a new value and checks if the new value is
* different from the old value.
*
* Returns 1 for change else 0.
*/
int snd_soc_test_bits(struct snd_soc_codec *codec, unsigned int reg,
unsigned int mask, unsigned int value)
{
int change;
unsigned int old, new;
old = snd_soc_read(codec, reg);
new = (old & ~mask) | value;
change = old != new;
return change;
}
EXPORT_SYMBOL_GPL(snd_soc_test_bits);
int snd_soc_platform_read(struct snd_soc_platform *platform,
unsigned int reg)
{
unsigned int ret;
if (!platform->driver->read) {
dev_err(platform->dev, "ASoC: platform has no read back\n");
return -1;
}
ret = platform->driver->read(platform, reg);
dev_dbg(platform->dev, "read %x => %x\n", reg, ret);
trace_snd_soc_preg_read(platform, reg, ret);
return ret;
}
EXPORT_SYMBOL_GPL(snd_soc_platform_read);
int snd_soc_platform_write(struct snd_soc_platform *platform,
unsigned int reg, unsigned int val)
{
if (!platform->driver->write) {
dev_err(platform->dev, "ASoC: platform has no write back\n");
return -1;
}
dev_dbg(platform->dev, "write %x = %x\n", reg, val);
trace_snd_soc_preg_write(platform, reg, val);
return platform->driver->write(platform, reg, val);
}
EXPORT_SYMBOL_GPL(snd_soc_platform_write);
#ifdef CONFIG_REGMAP
static int hw_write(struct snd_soc_codec *codec, unsigned int reg,
unsigned int value)
{
return regmap_write(codec->control_data, reg, value);
}
static unsigned int hw_read(struct snd_soc_codec *codec, unsigned int reg)
{
int ret;
unsigned int val;
ret = regmap_read(codec->control_data, reg, &val);
if (ret == 0)
return val;
else
return -1;
}
/**
* snd_soc_codec_set_cache_io: Set up standard I/O functions.
*
* @codec: CODEC to configure.
* @map: Register map to write to
*
* Register formats are frequently shared between many I2C and SPI
* devices. In order to promote code reuse the ASoC core provides
* some standard implementations of CODEC read and write operations
* which can be set up using this function.
*
* The caller is responsible for allocating and initialising the
* actual cache.
*
* Note that at present this code cannot be used by CODECs with
* volatile registers.
*/
int snd_soc_codec_set_cache_io(struct snd_soc_codec *codec,
struct regmap *regmap)
{
int ret;
if (!regmap)
return -EINVAL;
/* Device has made its own regmap arrangements */
codec->control_data = regmap;
codec->write = hw_write;
codec->read = hw_read;
ret = regmap_get_val_bytes(codec->control_data);
/* Errors are legitimate for non-integer byte
* multiples */
if (ret > 0)
codec->val_bytes = ret;
codec->using_regmap = true;
return 0;
}
EXPORT_SYMBOL_GPL(snd_soc_codec_set_cache_io);
#else
int snd_soc_codec_set_cache_io(struct snd_soc_codec *codec,
struct regmap *regmap)
{
return -ENOTSUPP;
}
EXPORT_SYMBOL_GPL(snd_soc_codec_set_cache_io);
#endif
