// 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)/* Clause-45 mask includes the device type (5 bit) and actual register number (16 bit) */#define REGNUM_C45_MASK		GENMASK(20, 0) static int regmap_mdio_c22_read(void *context, unsigned int reg, unsigned int *val){	struct mdio_device *mdio_dev = context;	int ret; 	if (unlikely(reg & ~REGNUM_C22_MASK))		return -ENXIO; 	ret = mdiodev_read(mdio_dev, reg);	if (ret < 0)		return ret; 	*val = ret & REGVAL_MASK; 	return 0;} static int regmap_mdio_c22_write(void *context, unsigned int reg, unsigned int val){	struct mdio_device *mdio_dev = context; 	if (unlikely(reg & ~REGNUM_C22_MASK))		return -ENXIO; 	return mdiodev_write(mdio_dev, reg, val);} static const struct regmap_bus regmap_mdio_c22_bus = {	.reg_write = regmap_mdio_c22_write,	.reg_read = regmap_mdio_c22_read,}; static int regmap_mdio_c45_read(void *context, unsigned int reg, unsigned int *val){	struct mdio_device *mdio_dev = context;	unsigned int devad;	int ret; 	if (unlikely(reg & ~REGNUM_C45_MASK))		return -ENXIO; 	devad = reg >> REGMAP_MDIO_C45_DEVAD_SHIFT;	reg = reg & REGMAP_MDIO_C45_REGNUM_MASK; 	ret = mdiodev_c45_read(mdio_dev, devad, reg);	if (ret < 0)		return ret; 	*val = ret & REGVAL_MASK; 	return 0;} static int regmap_mdio_c45_write(void *context, unsigned int reg, unsigned int val){	struct mdio_device *mdio_dev = context;	unsigned int devad; 	if (unlikely(reg & ~REGNUM_C45_MASK))		return -ENXIO; 	devad = reg >> REGMAP_MDIO_C45_DEVAD_SHIFT;	reg = reg & REGMAP_MDIO_C45_REGNUM_MASK; 	return mdiodev_c45_write(mdio_dev, devad, reg, val);} static const struct regmap_bus regmap_mdio_c45_bus = {	.reg_write = regmap_mdio_c45_write,	.reg_read = regmap_mdio_c45_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){	const struct regmap_bus *bus; 	if (config->reg_bits == 5 && config->val_bits == 16)		bus = &regmap_mdio_c22_bus;	else if (config->reg_bits == 21 && config->val_bits == 16)		bus = &regmap_mdio_c45_bus;	else		return ERR_PTR(-EOPNOTSUPP); 	return __regmap_init(&mdio_dev->dev, 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){	const struct regmap_bus *bus; 	if (config->reg_bits == 5 && config->val_bits == 16)		bus = &regmap_mdio_c22_bus;	else if (config->reg_bits == 21 && config->val_bits == 16)		bus = &regmap_mdio_c45_bus;	else		return ERR_PTR(-EOPNOTSUPP); 	return __devm_regmap_init(&mdio_dev->dev, 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");