drivers/mfd/stmpe-i2c.c

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

File Facts

System
Linux kernel
Corpus path
drivers/mfd/stmpe-i2c.c
Extension
.c
Size
3531 bytes
Lines
130
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
/*
 * ST Microelectronics MFD: stmpe's i2c client specific driver
 *
 * Copyright (C) ST-Ericsson SA 2010
 * Copyright (C) ST Microelectronics SA 2011
 *
 * Author: Rabin Vincent <rabin.vincent@stericsson.com> for ST-Ericsson
 * Author: Viresh Kumar <vireshk@kernel.org> for ST Microelectronics
 */

#include <linux/i2c.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/types.h>
#include <linux/of_device.h>
#include "stmpe.h"

static int i2c_reg_read(struct stmpe *stmpe, u8 reg)
{
	struct i2c_client *i2c = stmpe->client;

	return i2c_smbus_read_byte_data(i2c, reg);
}

static int i2c_reg_write(struct stmpe *stmpe, u8 reg, u8 val)
{
	struct i2c_client *i2c = stmpe->client;

	return i2c_smbus_write_byte_data(i2c, reg, val);
}

static int i2c_block_read(struct stmpe *stmpe, u8 reg, u8 length, u8 *values)
{
	struct i2c_client *i2c = stmpe->client;

	return i2c_smbus_read_i2c_block_data(i2c, reg, length, values);
}

static int i2c_block_write(struct stmpe *stmpe, u8 reg, u8 length,
		const u8 *values)
{
	struct i2c_client *i2c = stmpe->client;

	return i2c_smbus_write_i2c_block_data(i2c, reg, length, values);
}

static struct stmpe_client_info i2c_ci = {
	.read_byte = i2c_reg_read,
	.write_byte = i2c_reg_write,
	.read_block = i2c_block_read,
	.write_block = i2c_block_write,
};

static const struct of_device_id stmpe_of_match[] = {
	{ .compatible = "st,stmpe610", .data = (void *)STMPE610, },
	{ .compatible = "st,stmpe801", .data = (void *)STMPE801, },
	{ .compatible = "st,stmpe811", .data = (void *)STMPE811, },
	{ .compatible = "st,stmpe1600", .data = (void *)STMPE1600, },
	{ .compatible = "st,stmpe1601", .data = (void *)STMPE1601, },
	{ .compatible = "st,stmpe1801", .data = (void *)STMPE1801, },
	{ .compatible = "st,stmpe2401", .data = (void *)STMPE2401, },
	{ .compatible = "st,stmpe2403", .data = (void *)STMPE2403, },
	{},
};
MODULE_DEVICE_TABLE(of, stmpe_of_match);

static int
stmpe_i2c_probe(struct i2c_client *i2c)
{
	const struct i2c_device_id *id = i2c_client_get_device_id(i2c);
	enum stmpe_partnum partnum;
	const struct of_device_id *of_id;

	i2c_ci.data = (void *)id;
	i2c_ci.irq = i2c->irq;
	i2c_ci.client = i2c;
	i2c_ci.dev = &i2c->dev;

	of_id = of_match_device(stmpe_of_match, &i2c->dev);
	if (!of_id) {
		/*
		 * This happens when the I2C ID matches the node name
		 * but no real compatible string has been given.
		 */
		dev_info(&i2c->dev, "matching on node name, compatible is preferred\n");
		partnum = id->driver_data;
	} else
		partnum = (uintptr_t)of_id->data;

Annotation

Implementation Notes