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// SPDX-License-Identifier: GPL-2.0
#include <linux/errno.h>
#include <linux/mdio.h>
#include <linux/module.h>
#include <linux/regmap.h>
#define REGVAL_MASK GENMASK(15, 0)
#define REGNUM_C22_MASK GENMASK(4, 0)
static int regmap_mdio_read(void *context, unsigned int reg, unsigned int *val)
{
struct mdio_device *mdio_dev = context;
int ret;
ret = mdiobus_read(mdio_dev->bus, mdio_dev->addr, reg & REGNUM_C22_MASK);
if (ret < 0)
return ret;
*val = ret & REGVAL_MASK;
return 0;
}
static int regmap_mdio_write(void *context, unsigned int reg, unsigned int val)
{
struct mdio_device *mdio_dev = context;
return mdiobus_write(mdio_dev->bus, mdio_dev->addr, reg & REGNUM_C22_MASK, val);
}
static const struct regmap_bus regmap_mdio_bus = {
.reg_write = regmap_mdio_write,
.reg_read = regmap_mdio_read,
};
struct regmap *__regmap_init_mdio(struct mdio_device *mdio_dev,
const struct regmap_config *config, struct lock_class_key *lock_key,
const char *lock_name)
{
if (config->reg_bits != 5 || config->val_bits != 16)
return ERR_PTR(-EOPNOTSUPP);
return __regmap_init(&mdio_dev->dev, ®map_mdio_bus, mdio_dev, config,
lock_key, lock_name);
}
EXPORT_SYMBOL_GPL(__regmap_init_mdio);
struct regmap *__devm_regmap_init_mdio(struct mdio_device *mdio_dev,
const struct regmap_config *config, struct lock_class_key *lock_key,
const char *lock_name)
{
if (config->reg_bits != 5 || config->val_bits != 16)
return ERR_PTR(-EOPNOTSUPP);
return __devm_regmap_init(&mdio_dev->dev, ®map_mdio_bus, mdio_dev,
config, lock_key, lock_name);
}
EXPORT_SYMBOL_GPL(__devm_regmap_init_mdio);
MODULE_AUTHOR("Sander Vanheule <sander@svanheule.net>");
MODULE_DESCRIPTION("Regmap MDIO Module");
MODULE_LICENSE("GPL v2");
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