// SPDX-License-Identifier: GPL-2.0// Copyright(c) 2015-17 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/types.h>#include "internal.h" static int regmap_sdw_write(void *context, const void *val_buf, size_t val_size){	struct device *dev = context;	struct sdw_slave *slave = dev_to_sdw_dev(dev);	/* First word of buffer contains the destination address */	u32 addr = le32_to_cpu(*(const __le32 *)val_buf);	const u8 *val = val_buf; 	return sdw_nwrite_no_pm(slave, addr, val_size - sizeof(addr), val + sizeof(addr));} static int regmap_sdw_gather_write(void *context,				   const void *reg_buf, size_t reg_size,				   const void *val_buf, size_t val_size){	struct device *dev = context;	struct sdw_slave *slave = dev_to_sdw_dev(dev);	u32 addr = le32_to_cpu(*(const __le32 *)reg_buf); 	return sdw_nwrite_no_pm(slave, addr, val_size, val_buf);} static int regmap_sdw_read(void *context,			   const void *reg_buf, size_t reg_size,			   void *val_buf, size_t val_size){	struct device *dev = context;	struct sdw_slave *slave = dev_to_sdw_dev(dev);	u32 addr = le32_to_cpu(*(const __le32 *)reg_buf); 	return sdw_nread_no_pm(slave, addr, val_size, val_buf);} static const struct regmap_bus regmap_sdw = {	.write = regmap_sdw_write,	.gather_write = regmap_sdw_gather_write,	.read = regmap_sdw_read,	.reg_format_endian_default = REGMAP_ENDIAN_LITTLE,	.val_format_endian_default = REGMAP_ENDIAN_LITTLE,}; static int regmap_sdw_config_check(const struct regmap_config *config){	/* Register addresses are 32 bits wide */	if (config->reg_bits != 32)		return -ENOTSUPP; 	if (config->pad_bits != 0)		return -ENOTSUPP; 	/* Only bulk writes are supported not multi-register writes */	if (config->can_multi_write)		return -ENOTSUPP; 	return 0;} struct regmap *__regmap_init_sdw(struct sdw_slave *sdw,				 const struct regmap_config *config,				 struct lock_class_key *lock_key,				 const char *lock_name){	int ret; 	ret = regmap_sdw_config_check(config);	if (ret)		return ERR_PTR(ret); 	return __regmap_init(&sdw->dev, &regmap_sdw,			&sdw->dev, config, lock_key, lock_name);}EXPORT_SYMBOL_GPL(__regmap_init_sdw); struct regmap *__devm_regmap_init_sdw(struct sdw_slave *sdw,				      const struct regmap_config *config,				      struct lock_class_key *lock_key,				      const char *lock_name){	int ret; 	ret = regmap_sdw_config_check(config);	if (ret)		return ERR_PTR(ret); 	return __devm_regmap_init(&sdw->dev, &regmap_sdw,			&sdw->dev, config, lock_key, lock_name);}EXPORT_SYMBOL_GPL(__devm_regmap_init_sdw); MODULE_DESCRIPTION("regmap SoundWire Module");MODULE_LICENSE("GPL v2");