drivers/media/usb/dvb-usb/dvb-usb-i2c.c

Source file repositories/reference/linux-study-clean/drivers/media/usb/dvb-usb/dvb-usb-i2c.c

File Facts

System
Linux kernel
Corpus path
drivers/media/usb/dvb-usb/dvb-usb-i2c.c
Extension
.c
Size
1093 bytes
Lines
50
Domain
Driver Families
Bucket
drivers/media
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
/* dvb-usb-i2c.c is part of the DVB USB library.
 *
 * Copyright (C) 2004-6 Patrick Boettcher (patrick.boettcher@posteo.de)
 * see dvb-usb-init.c for copyright information.
 *
 * This file contains functions for (de-)initializing an I2C adapter.
 */
#include "dvb-usb-common.h"

int dvb_usb_i2c_init(struct dvb_usb_device *d)
{
	int ret = 0;

	if (!(d->props.caps & DVB_USB_IS_AN_I2C_ADAPTER))
		return 0;

	if (d->props.i2c_algo == NULL) {
		err("no i2c algorithm specified");
		ret = -EINVAL;
		goto err;
	}

	strscpy(d->i2c_adap.name, d->desc->name, sizeof(d->i2c_adap.name));
	d->i2c_adap.algo      = d->props.i2c_algo;
	d->i2c_adap.algo_data = NULL;
	d->i2c_adap.dev.parent = &d->udev->dev;

	i2c_set_adapdata(&d->i2c_adap, d);

	ret = i2c_add_adapter(&d->i2c_adap);
	if (ret < 0) {
		err("could not add i2c adapter");
		goto err;
	}

	d->state |= DVB_USB_STATE_I2C;

err:
	return ret;
}

int dvb_usb_i2c_exit(struct dvb_usb_device *d)
{
	if (d->state & DVB_USB_STATE_I2C)
		i2c_del_adapter(&d->i2c_adap);
	d->state &= ~DVB_USB_STATE_I2C;
	return 0;
}

Annotation

Implementation Notes