drivers/misc/ad525x_dpot-i2c.c

Source file repositories/reference/linux-study-clean/drivers/misc/ad525x_dpot-i2c.c

File Facts

System
Linux kernel
Corpus path
drivers/misc/ad525x_dpot-i2c.c
Extension
.c
Size
2669 bytes
Lines
119
Domain
Driver Families
Bucket
drivers/misc
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-or-later
/*
 * Driver for the Analog Devices digital potentiometers (I2C bus)
 *
 * Copyright (C) 2010-2011 Michael Hennerich, Analog Devices Inc.
 */

#include <linux/i2c.h>
#include <linux/module.h>

#include "ad525x_dpot.h"

/* I2C bus functions */
static int write_d8(void *client, u8 val)
{
	return i2c_smbus_write_byte(client, val);
}

static int write_r8d8(void *client, u8 reg, u8 val)
{
	return i2c_smbus_write_byte_data(client, reg, val);
}

static int write_r8d16(void *client, u8 reg, u16 val)
{
	return i2c_smbus_write_word_data(client, reg, val);
}

static int read_d8(void *client)
{
	return i2c_smbus_read_byte(client);
}

static int read_r8d8(void *client, u8 reg)
{
	return i2c_smbus_read_byte_data(client, reg);
}

static int read_r8d16(void *client, u8 reg)
{
	return i2c_smbus_read_word_data(client, reg);
}

static const struct ad_dpot_bus_ops bops = {
	.read_d8	= read_d8,
	.read_r8d8	= read_r8d8,
	.read_r8d16	= read_r8d16,
	.write_d8	= write_d8,
	.write_r8d8	= write_r8d8,
	.write_r8d16	= write_r8d16,
};

static int ad_dpot_i2c_probe(struct i2c_client *client)
{
	const struct i2c_device_id *id = i2c_client_get_device_id(client);
	struct ad_dpot_bus_data bdata = {
		.client = client,
		.bops = &bops,
	};

	if (!i2c_check_functionality(client->adapter,
				     I2C_FUNC_SMBUS_WORD_DATA)) {
		dev_err(&client->dev, "SMBUS Word Data not Supported\n");
		return -EIO;
	}

	return ad_dpot_probe(&client->dev, &bdata, id->driver_data, id->name);
}

static void ad_dpot_i2c_remove(struct i2c_client *client)
{
	ad_dpot_remove(&client->dev);
}

static const struct i2c_device_id ad_dpot_id[] = {
	{"ad5258", AD5258_ID},
	{"ad5259", AD5259_ID},
	{"ad5251", AD5251_ID},
	{"ad5252", AD5252_ID},
	{"ad5253", AD5253_ID},
	{"ad5254", AD5254_ID},
	{"ad5255", AD5255_ID},
	{"ad5241", AD5241_ID},
	{"ad5242", AD5242_ID},
	{"ad5243", AD5243_ID},
	{"ad5245", AD5245_ID},
	{"ad5246", AD5246_ID},
	{"ad5247", AD5247_ID},
	{"ad5248", AD5248_ID},
	{"ad5280", AD5280_ID},

Annotation

Implementation Notes