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// SPDX-License-Identifier: GPL-2.0
// Copyright(c) 2020 Intel Corporation.
#include <linux/device.h>
#include <linux/errno.h>
#include <linux/module.h>
#include <linux/regmap.h>
#include <linux/soundwire/sdw.h>
#include <linux/soundwire/sdw_registers.h>
#include "internal.h"
static int regmap_sdw_mbq_write(void *context, unsigned int reg, unsigned int val)
{
struct device *dev = context;
struct sdw_slave *slave = dev_to_sdw_dev(dev);
int ret;
ret = sdw_write_no_pm(slave, SDW_SDCA_MBQ_CTL(reg), (val >> 8) & 0xff);
if (ret < 0)
return ret;
return sdw_write_no_pm(slave, reg, val & 0xff);
}
static int regmap_sdw_mbq_read(void *context, unsigned int reg, unsigned int *val)
{
struct device *dev = context;
struct sdw_slave *slave = dev_to_sdw_dev(dev);
int read0;
int read1;
read0 = sdw_read_no_pm(slave, reg);
if (read0 < 0)
return read0;
read1 = sdw_read_no_pm(slave, SDW_SDCA_MBQ_CTL(reg));
if (read1 < 0)
return read1;
*val = (read1 << 8) | read0;
return 0;
}
static const struct regmap_bus regmap_sdw_mbq = {
.reg_read = regmap_sdw_mbq_read,
.reg_write = regmap_sdw_mbq_write,
.reg_format_endian_default = REGMAP_ENDIAN_LITTLE,
.val_format_endian_default = REGMAP_ENDIAN_LITTLE,
};
static int regmap_sdw_mbq_config_check(const struct regmap_config *config)
{
/* MBQ-based controls are only 16-bits for now */
if (config->val_bits != 16)
return -ENOTSUPP;
/* Registers are 32 bits wide */
if (config->reg_bits != 32)
return -ENOTSUPP;
if (config->pad_bits != 0)
return -ENOTSUPP;
return 0;
}
struct regmap *__regmap_init_sdw_mbq(struct sdw_slave *sdw,
const struct regmap_config *config,
struct lock_class_key *lock_key,
const char *lock_name)
{
int ret;
ret = regmap_sdw_mbq_config_check(config);
if (ret)
return ERR_PTR(ret);
return __regmap_init(&sdw->dev, ®map_sdw_mbq,
&sdw->dev, config, lock_key, lock_name);
}
EXPORT_SYMBOL_GPL(__regmap_init_sdw_mbq);
struct regmap *__devm_regmap_init_sdw_mbq(struct sdw_slave *sdw,
const struct regmap_config *config,
struct lock_class_key *lock_key,
const char *lock_name)
{
int ret;
ret = regmap_sdw_mbq_config_check(config);
if (ret)
return ERR_PTR(ret);
return __devm_regmap_init(&sdw->dev, ®map_sdw_mbq,
&sdw->dev, config, lock_key, lock_name);
}
EXPORT_SYMBOL_GPL(__devm_regmap_init_sdw_mbq);
MODULE_DESCRIPTION("regmap SoundWire MBQ Module");
MODULE_LICENSE("GPL");
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