drivers/mfd/arizona-i2c.c

Source file repositories/reference/linux-study-clean/drivers/mfd/arizona-i2c.c

File Facts

System
Linux kernel
Corpus path
drivers/mfd/arizona-i2c.c
Extension
.c
Size
3133 bytes
Lines
128
Domain
Driver Families
Bucket
drivers/mfd
Inferred role
Driver Families: implementation source
Status
source 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-only
/*
 * Arizona-i2c.c  --  Arizona I2C bus interface
 *
 * Copyright 2012 Wolfson Microelectronics plc
 *
 * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
 */

#include <linux/err.h>
#include <linux/i2c.h>
#include <linux/module.h>
#include <linux/pm_runtime.h>
#include <linux/regmap.h>
#include <linux/regulator/consumer.h>
#include <linux/slab.h>
#include <linux/of.h>

#include <linux/mfd/arizona/core.h>

#include "arizona.h"

static int arizona_i2c_probe(struct i2c_client *i2c)
{
	struct arizona *arizona;
	const struct regmap_config *regmap_config = NULL;
	unsigned long type;
	int ret;

	type = (uintptr_t)i2c_get_match_data(i2c);
	switch (type) {
	case WM5102:
		if (IS_ENABLED(CONFIG_MFD_WM5102))
			regmap_config = &wm5102_i2c_regmap;
		break;
	case WM5110:
	case WM8280:
		if (IS_ENABLED(CONFIG_MFD_WM5110))
			regmap_config = &wm5110_i2c_regmap;
		break;
	case WM8997:
		if (IS_ENABLED(CONFIG_MFD_WM8997))
			regmap_config = &wm8997_i2c_regmap;
		break;
	case WM8998:
	case WM1814:
		if (IS_ENABLED(CONFIG_MFD_WM8998))
			regmap_config = &wm8998_i2c_regmap;
		break;
	default:
		dev_err(&i2c->dev, "Unknown device type %ld\n", type);
		return -EINVAL;
	}

	if (!regmap_config) {
		dev_err(&i2c->dev,
			"No kernel support for device type %ld\n", type);
		return -EINVAL;
	}

	arizona = devm_kzalloc(&i2c->dev, sizeof(*arizona), GFP_KERNEL);
	if (arizona == NULL)
		return -ENOMEM;

	arizona->regmap = devm_regmap_init_i2c(i2c, regmap_config);
	if (IS_ERR(arizona->regmap)) {
		ret = PTR_ERR(arizona->regmap);
		dev_err(&i2c->dev, "Failed to allocate register map: %d\n",
			ret);
		return ret;
	}

	arizona->type = type;
	arizona->dev = &i2c->dev;
	arizona->irq = i2c->irq;

	return arizona_dev_init(arizona);
}

static void arizona_i2c_remove(struct i2c_client *i2c)
{
	struct arizona *arizona = dev_get_drvdata(&i2c->dev);

	arizona_dev_exit(arizona);
}

static const struct i2c_device_id arizona_i2c_id[] = {
	{ "wm5102", WM5102 },
	{ "wm5110", WM5110 },
	{ "wm8280", WM8280 },

Annotation

Implementation Notes