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.
- 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.
- Allocates kernel memory; connect allocation flags and lifetime to context constraints.
- Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.
Dependency Surface
linux/err.hlinux/i2c.hlinux/module.hlinux/pm_runtime.hlinux/regmap.hlinux/regulator/consumer.hlinux/slab.hlinux/of.hlinux/mfd/arizona/core.harizona.h
Detected Declarations
function arizona_i2c_probefunction arizona_i2c_remove
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
- Immediate include surface: `linux/err.h`, `linux/i2c.h`, `linux/module.h`, `linux/pm_runtime.h`, `linux/regmap.h`, `linux/regulator/consumer.h`, `linux/slab.h`, `linux/of.h`.
- Detected declarations: `function arizona_i2c_probe`, `function arizona_i2c_remove`.
- Atlas domain: Driver Families / drivers/mfd.
- Implementation status: source implementation candidate.
Implementation Notes
- This generated page is the file-by-file coverage layer; curated subsystem chapters should link here when they synthesize a multi-file control flow.
- Core OS pages should be promoted from atlas-only to deep-reviewed when they explain data structures, invariants, locking, lifecycle, and C implementation snippets.
- Driver-family pages are intentionally pattern-oriented unless they are part of the selected PCIe/NVMe representative device path.