mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-11-01 08:58:07 +00:00
4d9127faa8
Using the IS_ENABLED() macro can make the code shorter and simpler. Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com> Signed-off-by: Mark Brown <broonie@linaro.org>
146 lines
3.5 KiB
C
146 lines
3.5 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>
|
|
|
|
#include <trace/events/asoc.h>
|
|
|
|
#ifdef CONFIG_REGMAP
|
|
static int hw_write(struct snd_soc_codec *codec, unsigned int reg,
|
|
unsigned int value)
|
|
{
|
|
int ret;
|
|
|
|
if (!snd_soc_codec_volatile_register(codec, reg) &&
|
|
reg < codec->driver->reg_cache_size &&
|
|
!codec->cache_bypass) {
|
|
ret = snd_soc_cache_write(codec, reg, value);
|
|
if (ret < 0)
|
|
return -1;
|
|
}
|
|
|
|
if (codec->cache_only) {
|
|
codec->cache_sync = 1;
|
|
return 0;
|
|
}
|
|
|
|
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;
|
|
|
|
if (reg >= codec->driver->reg_cache_size ||
|
|
snd_soc_codec_volatile_register(codec, reg) ||
|
|
codec->cache_bypass) {
|
|
if (codec->cache_only)
|
|
return -1;
|
|
|
|
ret = regmap_read(codec->control_data, reg, &val);
|
|
if (ret == 0)
|
|
return val;
|
|
else
|
|
return -1;
|
|
}
|
|
|
|
ret = snd_soc_cache_read(codec, reg, &val);
|
|
if (ret < 0)
|
|
return -1;
|
|
return val;
|
|
}
|
|
|
|
/**
|
|
* snd_soc_codec_set_cache_io: Set up standard I/O functions.
|
|
*
|
|
* @codec: CODEC to configure.
|
|
* @addr_bits: Number of bits of register address data.
|
|
* @data_bits: Number of bits of data per register.
|
|
* @control: Control bus used.
|
|
*
|
|
* 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,
|
|
int addr_bits, int data_bits,
|
|
enum snd_soc_control_type control)
|
|
{
|
|
struct regmap_config config;
|
|
int ret;
|
|
|
|
memset(&config, 0, sizeof(config));
|
|
codec->write = hw_write;
|
|
codec->read = hw_read;
|
|
|
|
config.reg_bits = addr_bits;
|
|
config.val_bits = data_bits;
|
|
|
|
switch (control) {
|
|
#if IS_ENABLED(CONFIG_REGMAP_I2C)
|
|
case SND_SOC_I2C:
|
|
codec->control_data = regmap_init_i2c(to_i2c_client(codec->dev),
|
|
&config);
|
|
break;
|
|
#endif
|
|
|
|
#if IS_ENABLED(CONFIG_REGMAP_SPI)
|
|
case SND_SOC_SPI:
|
|
codec->control_data = regmap_init_spi(to_spi_device(codec->dev),
|
|
&config);
|
|
break;
|
|
#endif
|
|
|
|
case SND_SOC_REGMAP:
|
|
/* Device has made its own regmap arrangements */
|
|
codec->using_regmap = true;
|
|
if (!codec->control_data)
|
|
codec->control_data = dev_get_regmap(codec->dev, NULL);
|
|
|
|
if (codec->control_data) {
|
|
ret = regmap_get_val_bytes(codec->control_data);
|
|
/* Errors are legitimate for non-integer byte
|
|
* multiples */
|
|
if (ret > 0)
|
|
codec->val_bytes = ret;
|
|
}
|
|
break;
|
|
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
|
|
return PTR_ERR_OR_ZERO(codec->control_data);
|
|
}
|
|
EXPORT_SYMBOL_GPL(snd_soc_codec_set_cache_io);
|
|
#else
|
|
int snd_soc_codec_set_cache_io(struct snd_soc_codec *codec,
|
|
int addr_bits, int data_bits,
|
|
enum snd_soc_control_type control)
|
|
{
|
|
return -ENOTSUPP;
|
|
}
|
|
EXPORT_SYMBOL_GPL(snd_soc_codec_set_cache_io);
|
|
#endif
|