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.
- 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.
- Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.
Dependency Surface
dvb-usb-common.h
Detected Declarations
function Copyrightfunction dvb_usb_i2c_exit
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
- Immediate include surface: `dvb-usb-common.h`.
- Detected declarations: `function Copyright`, `function dvb_usb_i2c_exit`.
- Atlas domain: Driver Families / drivers/media.
- 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.