drivers/base/regmap/regmap-spmi.c

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

File Facts

System
Linux kernel
Corpus path
drivers/base/regmap/regmap-spmi.c
Extension
.c
Size
5136 bytes
Lines
227
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
//
// Register map access API - SPMI support
//
// Copyright (c) 2012-2013, The Linux Foundation. All rights reserved.
//
// Based on regmap-i2c.c:
// Copyright 2011 Wolfson Microelectronics plc
// Author: Mark Brown <broonie@opensource.wolfsonmicro.com>

#include <linux/regmap.h>
#include <linux/spmi.h>
#include <linux/module.h>
#include <linux/init.h>

static int regmap_spmi_base_read(void *context,
				 const void *reg, size_t reg_size,
				 void *val, size_t val_size)
{
	u8 addr = *(u8 *)reg;
	int err = 0;

	BUG_ON(reg_size != 1);

	while (val_size-- && !err)
		err = spmi_register_read(context, addr++, val++);

	return err;
}

static int regmap_spmi_base_gather_write(void *context,
					 const void *reg, size_t reg_size,
					 const void *val, size_t val_size)
{
	const u8 *data = val;
	u8 addr = *(u8 *)reg;
	int err = 0;

	BUG_ON(reg_size != 1);

	/*
	 * SPMI defines a more bandwidth-efficient 'Register 0 Write' sequence,
	 * use it when possible.
	 */
	if (addr == 0 && val_size) {
		err = spmi_register_zero_write(context, *data);
		if (err)
			goto err_out;

		data++;
		addr++;
		val_size--;
	}

	while (val_size) {
		err = spmi_register_write(context, addr, *data);
		if (err)
			goto err_out;

		data++;
		addr++;
		val_size--;
	}

err_out:
	return err;
}

static int regmap_spmi_base_write(void *context, const void *data,
				  size_t count)
{
	BUG_ON(count < 1);
	return regmap_spmi_base_gather_write(context, data, 1, data + 1,
					     count - 1);
}

static const struct regmap_bus regmap_spmi_base = {
	.read				= regmap_spmi_base_read,
	.write				= regmap_spmi_base_write,
	.gather_write			= regmap_spmi_base_gather_write,
	.reg_format_endian_default	= REGMAP_ENDIAN_NATIVE,
	.val_format_endian_default	= REGMAP_ENDIAN_NATIVE,
};

struct regmap *__regmap_init_spmi_base(struct spmi_device *sdev,
				       const struct regmap_config *config,
				       struct lock_class_key *lock_key,
				       const char *lock_name)
{
	return __regmap_init(&sdev->dev, &regmap_spmi_base, sdev, config,

Annotation

Implementation Notes