// SPDX-License-Identifier: GPL-2.0//// Register map access API - SPI support//// Copyright 2011 Wolfson Microelectronics plc//// Author: Mark Brown <broonie@opensource.wolfsonmicro.com> #include <linux/regmap.h>#include <linux/spi/spi.h>#include <linux/module.h> #include "internal.h" struct regmap_async_spi {	struct regmap_async core;	struct spi_message m;	struct spi_transfer t[2];}; static void regmap_spi_complete(void *data){	struct regmap_async_spi *async = data; 	regmap_async_complete_cb(&async->core, async->m.status);} static int regmap_spi_write(void *context, const void *data, size_t count){	struct device *dev = context;	struct spi_device *spi = to_spi_device(dev); 	return spi_write(spi, data, count);} static int regmap_spi_gather_write(void *context,				   const void *reg, size_t reg_len,				   const void *val, size_t val_len){	struct device *dev = context;	struct spi_device *spi = to_spi_device(dev);	struct spi_message m;	struct spi_transfer t[2] = { { .tx_buf = reg, .len = reg_len, },				     { .tx_buf = val, .len = val_len, }, }; 	spi_message_init(&m);	spi_message_add_tail(&t[0], &m);	spi_message_add_tail(&t[1], &m); 	return spi_sync(spi, &m);} static int regmap_spi_async_write(void *context,				  const void *reg, size_t reg_len,				  const void *val, size_t val_len,				  struct regmap_async *a){	struct regmap_async_spi *async = container_of(a,						      struct regmap_async_spi,						      core);	struct device *dev = context;	struct spi_device *spi = to_spi_device(dev); 	async->t[0].tx_buf = reg;	async->t[0].len = reg_len;	async->t[1].tx_buf = val;	async->t[1].len = val_len; 	spi_message_init(&async->m);	spi_message_add_tail(&async->t[0], &async->m);	if (val)		spi_message_add_tail(&async->t[1], &async->m); 	async->m.complete = regmap_spi_complete;	async->m.context = async; 	return spi_async(spi, &async->m);} static struct regmap_async *regmap_spi_async_alloc(void){	struct regmap_async_spi *async_spi; 	async_spi = kzalloc_obj(*async_spi);	if (!async_spi)		return NULL; 	return &async_spi->core;} static int regmap_spi_read(void *context,			   const void *reg, size_t reg_size,			   void *val, size_t val_size){	struct device *dev = context;	struct spi_device *spi = to_spi_device(dev); 	return spi_write_then_read(spi, reg, reg_size, val, val_size);} static const struct regmap_bus regmap_spi = {	.write = regmap_spi_write,	.gather_write = regmap_spi_gather_write,	.async_write = regmap_spi_async_write,	.async_alloc = regmap_spi_async_alloc,	.read = regmap_spi_read,	.read_flag_mask = 0x80,	.reg_format_endian_default = REGMAP_ENDIAN_BIG,	.val_format_endian_default = REGMAP_ENDIAN_BIG,}; static const struct regmap_bus *regmap_get_spi_bus(struct spi_device *spi,						   const struct regmap_config *config){	size_t max_size = spi_max_transfer_size(spi);	size_t max_msg_size, reg_reserve_size;	struct regmap_bus *bus; 	if (max_size != SIZE_MAX) {		bus = kmemdup(&regmap_spi, sizeof(*bus), GFP_KERNEL);		if (!bus)			return ERR_PTR(-ENOMEM); 		max_msg_size = spi_max_message_size(spi);		reg_reserve_size = (config->reg_bits + config->pad_bits) / BITS_PER_BYTE;		if (max_size + reg_reserve_size > max_msg_size)			max_size -= reg_reserve_size; 		bus->free_on_exit = true;		bus->max_raw_read = max_size;		bus->max_raw_write = max_size; 		return bus;	} 	return &regmap_spi;} struct regmap *__regmap_init_spi(struct spi_device *spi,				 const struct regmap_config *config,				 struct lock_class_key *lock_key,				 const char *lock_name){	const struct regmap_bus *bus = regmap_get_spi_bus(spi, config); 	if (IS_ERR(bus))		return ERR_CAST(bus); 	return __regmap_init(&spi->dev, bus, &spi->dev, config, lock_key, lock_name);}EXPORT_SYMBOL_GPL(__regmap_init_spi); struct regmap *__devm_regmap_init_spi(struct spi_device *spi,				      const struct regmap_config *config,				      struct lock_class_key *lock_key,				      const char *lock_name){	const struct regmap_bus *bus = regmap_get_spi_bus(spi, config); 	if (IS_ERR(bus))		return ERR_CAST(bus); 	return __devm_regmap_init(&spi->dev, bus, &spi->dev, config, lock_key, lock_name);}EXPORT_SYMBOL_GPL(__devm_regmap_init_spi); MODULE_DESCRIPTION("regmap SPI Module");MODULE_LICENSE("GPL");