274 lines
7.3 KiB
C
274 lines
7.3 KiB
C
/*
|
|
* 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);
|
|
|
|
ret = component->read(component, reg, &old);
|
|
if (ret < 0)
|
|
goto out_unlock;
|
|
|
|
new = (old & ~mask) | (val & mask);
|
|
*change = old != new;
|
|
if (*change)
|
|
ret = component->write(component, reg, new);
|
|
out_unlock:
|
|
mutex_unlock(&component->io_mutex);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* snd_soc_component_update_bits() - Perform read/modify/write cycle
|
|
* @component: Component to update
|
|
* @reg: Register to update
|
|
* @mask: Mask that specifies which bits to update
|
|
* @val: New value for the bits specified by mask
|
|
*
|
|
* Return: 1 if the operation was successful and the value of the register
|
|
* changed, 0 if the operation was successful, but the value did not change.
|
|
* Returns a negative error code otherwise.
|
|
*/
|
|
int snd_soc_component_update_bits(struct snd_soc_component *component,
|
|
unsigned int reg, unsigned int mask, unsigned int val)
|
|
{
|
|
bool change;
|
|
int ret;
|
|
|
|
if (component->regmap)
|
|
ret = regmap_update_bits_check(component->regmap, reg, mask,
|
|
val, &change);
|
|
else
|
|
ret = snd_soc_component_update_bits_legacy(component, reg,
|
|
mask, val, &change);
|
|
|
|
if (ret < 0)
|
|
return ret;
|
|
return change;
|
|
}
|
|
EXPORT_SYMBOL_GPL(snd_soc_component_update_bits);
|
|
|
|
/**
|
|
* snd_soc_component_update_bits_async() - Perform asynchronous
|
|
* read/modify/write cycle
|
|
* @component: Component to update
|
|
* @reg: Register to update
|
|
* @mask: Mask that specifies which bits to update
|
|
* @val: New value for the bits specified by mask
|
|
*
|
|
* This function is similar to snd_soc_component_update_bits(), but the update
|
|
* operation is scheduled asynchronously. This means it may not be completed
|
|
* when the function returns. To make sure that all scheduled updates have been
|
|
* completed snd_soc_component_async_complete() must be called.
|
|
*
|
|
* Return: 1 if the operation was successful and the value of the register
|
|
* changed, 0 if the operation was successful, but the value did not change.
|
|
* Returns a negative error code otherwise.
|
|
*/
|
|
int snd_soc_component_update_bits_async(struct snd_soc_component *component,
|
|
unsigned int reg, unsigned int mask, unsigned int val)
|
|
{
|
|
bool change;
|
|
int ret;
|
|
|
|
if (component->regmap)
|
|
ret = regmap_update_bits_check_async(component->regmap, reg,
|
|
mask, val, &change);
|
|
else
|
|
ret = snd_soc_component_update_bits_legacy(component, reg,
|
|
mask, val, &change);
|
|
|
|
if (ret < 0)
|
|
return ret;
|
|
return change;
|
|
}
|
|
EXPORT_SYMBOL_GPL(snd_soc_component_update_bits_async);
|
|
|
|
/**
|
|
* snd_soc_component_async_complete() - Ensure asynchronous I/O has completed
|
|
* @component: Component for which to wait
|
|
*
|
|
* This function blocks until all asynchronous I/O which has previously been
|
|
* scheduled using snd_soc_component_update_bits_async() has completed.
|
|
*/
|
|
void snd_soc_component_async_complete(struct snd_soc_component *component)
|
|
{
|
|
if (component->regmap)
|
|
regmap_async_complete(component->regmap);
|
|
}
|
|
EXPORT_SYMBOL_GPL(snd_soc_component_async_complete);
|
|
|
|
/**
|
|
* snd_soc_component_test_bits - Test register for change
|
|
* @component: component
|
|
* @reg: Register to test
|
|
* @mask: Mask that specifies which bits to test
|
|
* @value: Value to test against
|
|
*
|
|
* Tests a register with a new value and checks if the new value is
|
|
* different from the old value.
|
|
*
|
|
* Return: 1 for change, otherwise 0.
|
|
*/
|
|
int snd_soc_component_test_bits(struct snd_soc_component *component,
|
|
unsigned int reg, unsigned int mask, unsigned int value)
|
|
{
|
|
unsigned int old, new;
|
|
int ret;
|
|
|
|
ret = snd_soc_component_read(component, reg, &old);
|
|
if (ret < 0)
|
|
return ret;
|
|
new = (old & ~mask) | value;
|
|
return old != new;
|
|
}
|
|
EXPORT_SYMBOL_GPL(snd_soc_component_test_bits);
|
|
|
|
unsigned int snd_soc_read(struct snd_soc_codec *codec, unsigned int reg)
|
|
{
|
|
unsigned int val;
|
|
int ret;
|
|
|
|
ret = snd_soc_component_read(&codec->component, reg, &val);
|
|
if (ret < 0)
|
|
return -1;
|
|
|
|
return val;
|
|
}
|
|
EXPORT_SYMBOL_GPL(snd_soc_read);
|
|
|
|
int snd_soc_write(struct snd_soc_codec *codec, unsigned int reg,
|
|
unsigned int val)
|
|
{
|
|
return snd_soc_component_write(&codec->component, 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)
|
|
{
|
|
return snd_soc_component_update_bits(&codec->component, reg, mask,
|
|
value);
|
|
}
|
|
EXPORT_SYMBOL_GPL(snd_soc_update_bits);
|
|
|
|
/**
|
|
* 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)
|
|
{
|
|
return snd_soc_component_test_bits(&codec->component, reg, mask, value);
|
|
}
|
|
EXPORT_SYMBOL_GPL(snd_soc_test_bits);
|
|
|
|
int snd_soc_platform_read(struct snd_soc_platform *platform,
|
|
unsigned int reg)
|
|
{
|
|
unsigned int val;
|
|
int ret;
|
|
|
|
ret = snd_soc_component_read(&platform->component, reg, &val);
|
|
if (ret < 0)
|
|
return -1;
|
|
|
|
return val;
|
|
}
|
|
EXPORT_SYMBOL_GPL(snd_soc_platform_read);
|
|
|
|
int snd_soc_platform_write(struct snd_soc_platform *platform,
|
|
unsigned int reg, unsigned int val)
|
|
{
|
|
return snd_soc_component_write(&platform->component, reg, val);
|
|
}
|
|
EXPORT_SYMBOL_GPL(snd_soc_platform_write);
|