drivers/media/tuners/e4000.c

File Facts

System

Linux kernel

Corpus path

drivers/media/tuners/e4000.c

Extension

.c

Size

17799 bytes

Lines

742

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.
• Allocates kernel memory; connect allocation flags and lifetime to context constraints.
• Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.

Dependency Surface

• e4000_priv.h

Detected Declarations

• function Copyright
• function e4000_sleep
• function e4000_set_params
• function e4000_standby
• function e4000_g_tuner
• function e4000_s_tuner
• function e4000_g_frequency
• function e4000_s_frequency
• function e4000_enum_freq_bands
• function e4000_set_lna_gain
• function e4000_set_mixer_gain
• function e4000_set_if_gain
• function e4000_pll_lock
• function e4000_g_volatile_ctrl
• function e4000_s_ctrl
• function e4000_dvb_set_params
• function e4000_dvb_init
• function e4000_dvb_sleep
• function e4000_dvb_get_if_frequency
• function e4000_probe
• function e4000_remove

Annotated Snippet

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Elonics E4000 silicon tuner driver
 *
 * Copyright (C) 2012 Antti Palosaari <crope@iki.fi>
 */

#include "e4000_priv.h"

static int e4000_init(struct e4000_dev *dev)
{
	struct i2c_client *client = dev->client;
	int ret;

	dev_dbg(&client->dev, "\n");

	/* reset */
	ret = regmap_write(dev->regmap, 0x00, 0x01);
	if (ret)
		goto err;

	/* disable output clock */
	ret = regmap_write(dev->regmap, 0x06, 0x00);
	if (ret)
		goto err;

	ret = regmap_write(dev->regmap, 0x7a, 0x96);
	if (ret)
		goto err;

	/* configure gains */
	ret = regmap_bulk_write(dev->regmap, 0x7e, "\x01\xfe", 2);
	if (ret)
		goto err;

	ret = regmap_write(dev->regmap, 0x82, 0x00);
	if (ret)
		goto err;

	ret = regmap_write(dev->regmap, 0x24, 0x05);
	if (ret)
		goto err;

	ret = regmap_bulk_write(dev->regmap, 0x87, "\x20\x01", 2);
	if (ret)
		goto err;

	ret = regmap_bulk_write(dev->regmap, 0x9f, "\x7f\x07", 2);
	if (ret)
		goto err;

	/* DC offset control */
	ret = regmap_write(dev->regmap, 0x2d, 0x1f);
	if (ret)
		goto err;

	ret = regmap_bulk_write(dev->regmap, 0x70, "\x01\x01", 2);
	if (ret)
		goto err;

	/* gain control */
	ret = regmap_write(dev->regmap, 0x1a, 0x17);
	if (ret)
		goto err;

	ret = regmap_write(dev->regmap, 0x1f, 0x1a);
	if (ret)
		goto err;

	dev->active = true;

	return 0;
err:
	dev_dbg(&client->dev, "failed=%d\n", ret);
	return ret;
}

static int e4000_sleep(struct e4000_dev *dev)
{
	struct i2c_client *client = dev->client;
	int ret;

	dev_dbg(&client->dev, "\n");

	dev->active = false;

	ret = regmap_write(dev->regmap, 0x00, 0x00);
	if (ret)
		goto err;

Annotation

• Immediate include surface: `e4000_priv.h`.
• Detected declarations: `function Copyright`, `function e4000_sleep`, `function e4000_set_params`, `function e4000_standby`, `function e4000_g_tuner`, `function e4000_s_tuner`, `function e4000_g_frequency`, `function e4000_s_frequency`, `function e4000_enum_freq_bands`, `function e4000_set_lna_gain`.
• 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.