drivers/base/regmap/regmap-i3c.c

Source file repositories/reference/linux-study-clean/drivers/base/regmap/regmap-i3c.c

File Facts

System
Linux kernel
Corpus path
drivers/base/regmap/regmap-i3c.c
Extension
.c
Size
1869 bytes
Lines
72
Domain
Driver Families
Bucket
drivers/base
Inferred role
Driver Families: exported/initcall integration point
Status
integration implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

// SPDX-License-Identifier: GPL-2.0
// Copyright (c) 2018 Synopsys, Inc. and/or its affiliates.

#include <linux/array_size.h>
#include <linux/regmap.h>
#include <linux/i3c/device.h>
#include <linux/i3c/master.h>
#include <linux/module.h>

static int regmap_i3c_write(void *context, const void *data, size_t count)
{
	struct device *dev = context;
	struct i3c_device *i3c = dev_to_i3cdev(dev);
	struct i3c_xfer xfers[] = {
		{
			.rnw = false,
			.len = count,
			.data.out = data,
		},
	};

	return i3c_device_do_xfers(i3c, xfers, ARRAY_SIZE(xfers), I3C_SDR);
}

static int regmap_i3c_read(void *context,
			   const void *reg, size_t reg_size,
			   void *val, size_t val_size)
{
	struct device *dev = context;
	struct i3c_device *i3c = dev_to_i3cdev(dev);
	struct i3c_xfer xfers[2];

	xfers[0].rnw = false;
	xfers[0].len = reg_size;
	xfers[0].data.out = reg;

	xfers[1].rnw = true;
	xfers[1].len = val_size;
	xfers[1].data.in = val;

	return i3c_device_do_xfers(i3c, xfers, ARRAY_SIZE(xfers), I3C_SDR);
}

static const struct regmap_bus regmap_i3c = {
	.write = regmap_i3c_write,
	.read = regmap_i3c_read,
};

struct regmap *__regmap_init_i3c(struct i3c_device *i3c,
				 const struct regmap_config *config,
				 struct lock_class_key *lock_key,
				 const char *lock_name)
{
	return __regmap_init(&i3c->dev, &regmap_i3c, &i3c->dev, config,
				  lock_key, lock_name);
}
EXPORT_SYMBOL_GPL(__regmap_init_i3c);

struct regmap *__devm_regmap_init_i3c(struct i3c_device *i3c,
				      const struct regmap_config *config,
				      struct lock_class_key *lock_key,
				      const char *lock_name)
{
	return __devm_regmap_init(&i3c->dev, &regmap_i3c, &i3c->dev, config,
				  lock_key, lock_name);
}
EXPORT_SYMBOL_GPL(__devm_regmap_init_i3c);

MODULE_AUTHOR("Vitor Soares <vitor.soares@synopsys.com>");
MODULE_DESCRIPTION("regmap I3C Module");
MODULE_LICENSE("GPL v2");

Annotation

Implementation Notes