drivers/mfd/axp20x-i2c.c

Source file repositories/reference/linux-study-clean/drivers/mfd/axp20x-i2c.c

File Facts

System
Linux kernel
Corpus path
drivers/mfd/axp20x-i2c.c
Extension
.c
Size
3211 bytes
Lines
121
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
/*
 * I2C driver for the X-Powers' Power Management ICs
 *
 * AXP20x typically comprises an adaptive USB-Compatible PWM charger, BUCK DC-DC
 * converters, LDOs, multiple 12-bit ADCs of voltage, current and temperature
 * as well as configurable GPIOs.
 *
 * This driver supports the I2C variants.
 *
 * Copyright (C) 2014 Carlo Caione
 *
 * Author: Carlo Caione <carlo@caione.org>
 */

#include <linux/acpi.h>
#include <linux/err.h>
#include <linux/i2c.h>
#include <linux/module.h>
#include <linux/mfd/axp20x.h>
#include <linux/of.h>
#include <linux/regmap.h>
#include <linux/slab.h>

static int axp20x_i2c_probe(struct i2c_client *i2c)
{
	struct axp20x_dev *axp20x;
	int ret;

	axp20x = devm_kzalloc(&i2c->dev, sizeof(*axp20x), GFP_KERNEL);
	if (!axp20x)
		return -ENOMEM;

	axp20x->dev = &i2c->dev;
	axp20x->irq = i2c->irq;
	dev_set_drvdata(axp20x->dev, axp20x);

	ret = axp20x_match_device(axp20x);
	if (ret)
		return ret;

	axp20x->regmap = devm_regmap_init_i2c(i2c, axp20x->regmap_cfg);
	if (IS_ERR(axp20x->regmap)) {
		ret = PTR_ERR(axp20x->regmap);
		dev_err(&i2c->dev, "regmap init failed: %d\n", ret);
		return ret;
	}

	return axp20x_device_probe(axp20x);
}

static void axp20x_i2c_remove(struct i2c_client *i2c)
{
	struct axp20x_dev *axp20x = i2c_get_clientdata(i2c);

	axp20x_device_remove(axp20x);
}

#ifdef CONFIG_OF
static const struct of_device_id axp20x_i2c_of_match[] = {
	{ .compatible = "x-powers,axp152", .data = (void *)AXP152_ID },
	{ .compatible = "x-powers,axp192", .data = (void *)AXP192_ID },
	{ .compatible = "x-powers,axp202", .data = (void *)AXP202_ID },
	{ .compatible = "x-powers,axp209", .data = (void *)AXP209_ID },
	{ .compatible = "x-powers,axp221", .data = (void *)AXP221_ID },
	{ .compatible = "x-powers,axp223", .data = (void *)AXP223_ID },
	{ .compatible = "x-powers,axp313a", .data = (void *)AXP313A_ID },
	{ .compatible = "x-powers,axp323", .data = (void *)AXP323_ID },
	{ .compatible = "x-powers,axp717", .data = (void *)AXP717_ID },
	{ .compatible = "x-powers,axp803", .data = (void *)AXP803_ID },
	{ .compatible = "x-powers,axp806", .data = (void *)AXP806_ID },
	{ .compatible = "x-powers,axp15060", .data = (void *)AXP15060_ID },
	{ },
};
MODULE_DEVICE_TABLE(of, axp20x_i2c_of_match);
#endif

static const struct i2c_device_id axp20x_i2c_id[] = {
	{ "axp152" },
	{ "axp192" },
	{ "axp202" },
	{ "axp209" },
	{ "axp221" },
	{ "axp223" },
	{ "axp313a" },
	{ "axp717" },
	{ "axp803" },
	{ "axp806" },
	{ "axp15060" },
	{ }

Annotation

Implementation Notes