drivers/iio/dac/ad5696-i2c.c

Source file repositories/reference/linux-study-clean/drivers/iio/dac/ad5696-i2c.c

File Facts

System
Linux kernel
Corpus path
drivers/iio/dac/ad5696-i2c.c
Extension
.c
Size
2989 bytes
Lines
123
Domain
Driver Families
Bucket
drivers/iio
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
/*
 * AD5338R, AD5671R, AD5673R, AD5675R, AD5677R, AD5691R, AD5692R, AD5693,
 * AD5693R, AD5694, AD5694R, AD5695R, AD5696, AD5696R
 * Digital to analog converters driver
 *
 * Copyright 2018 Analog Devices Inc.
 */

#include "ad5686.h"

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

static int ad5686_i2c_read(struct ad5686_state *st, u8 addr)
{
	struct i2c_client *i2c = to_i2c_client(st->dev);
	struct i2c_msg msg[2] = {
		{
			.addr = i2c->addr,
			.flags = i2c->flags,
			.len = 3,
			.buf = &st->data[0].d8[1],
		},
		{
			.addr = i2c->addr,
			.flags = i2c->flags | I2C_M_RD,
			.len = 2,
			.buf = (char *)&st->data[0].d16,
		},
	};
	int ret;

	st->data[0].d32 = cpu_to_be32(AD5686_CMD(AD5686_CMD_NOOP) |
				      AD5686_ADDR(addr) |
				      0x00);

	ret = i2c_transfer(i2c->adapter, msg, 2);
	if (ret < 0)
		return ret;

	return be16_to_cpu(st->data[0].d16);
}

static int ad5686_i2c_write(struct ad5686_state *st,
			    u8 cmd, u8 addr, u16 val)
{
	struct i2c_client *i2c = to_i2c_client(st->dev);
	int ret;

	st->data[0].d32 = cpu_to_be32(AD5686_CMD(cmd) | AD5686_ADDR(addr)
				      | val);

	ret = i2c_master_send(i2c, &st->data[0].d8[1], 3);
	if (ret < 0)
		return ret;

	return (ret != 3) ? -EIO : 0;
}

static int ad5686_i2c_probe(struct i2c_client *i2c)
{
	const struct i2c_device_id *id = i2c_client_get_device_id(i2c);
	return ad5686_probe(&i2c->dev, id->driver_data, id->name,
			    ad5686_i2c_write, ad5686_i2c_read);
}

static const struct i2c_device_id ad5686_i2c_id[] = {
	{"ad5311r", ID_AD5311R},
	{"ad5337r", ID_AD5337R},
	{"ad5338r", ID_AD5338R},
	{"ad5671r", ID_AD5671R},
	{"ad5673r", ID_AD5673R},
	{"ad5675r", ID_AD5675R},
	{"ad5677r", ID_AD5677R},
	{"ad5691r", ID_AD5691R},
	{"ad5692r", ID_AD5692R},
	{"ad5693", ID_AD5693},
	{"ad5693r", ID_AD5693R},
	{"ad5694", ID_AD5694},
	{"ad5694r", ID_AD5694R},
	{"ad5695r", ID_AD5695R},
	{"ad5696", ID_AD5696},
	{"ad5696r", ID_AD5696R},
	{ }
};
MODULE_DEVICE_TABLE(i2c, ad5686_i2c_id);

static const struct of_device_id ad5686_of_match[] = {
	{ .compatible = "adi,ad5311r" },

Annotation

Implementation Notes