drivers/base/regmap/regmap-spi.c


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// 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 <spi/spi.h>

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_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,
	.read = regmap_spi_read,
	.read_flag_mask = 0x80,
	.reg_format_endian_default = REGMAP_ENDIAN_BIG,
	.val_format_endian_default = REGMAP_ENDIAN_BIG,
};

struct regmap *regmap_init_spi(struct spi_device *spi,
			       const struct regmap_config *config)
{
	return regmap_init(&spi->dev, &regmap_spi, &spi->dev, config);
}