drivers/media/dvb-frontends/zd1301_demod.c

File Facts

System

Linux kernel

Corpus path

drivers/media/dvb-frontends/zd1301_demod.c

Extension

.c

Size

12732 bytes

Lines

541

Domain

Driver Families

Bucket

drivers/media

Inferred role

Driver Families: exported/initcall integration point

Status

integration 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.
• Exports symbols or registers init work; inspect boot/module ordering and who consumes the exported contract.
• 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

• zd1301_demod.h

Detected Declarations

• struct zd1301_demod_dev
• function zd1301_demod_wreg
• function zd1301_demod_rreg
• function zd1301_demod_set_frontend
• function zd1301_demod_sleep
• function zd1301_demod_init
• function zd1301_demod_get_tune_settings
• function zd1301_demod_read_status
• function zd1301_demod_i2c_master_xfer
• function zd1301_demod_i2c_functionality
• function zd1301_demod_probe
• function zd1301_demod_remove
• export zd1301_demod_get_dvb_frontend
• export zd1301_demod_get_i2c_adapter

Annotated Snippet

struct zd1301_demod_dev {
	struct platform_device *pdev;
	struct dvb_frontend frontend;
	struct i2c_adapter adapter;
	u8 gain;
};

static int zd1301_demod_wreg(struct zd1301_demod_dev *dev, u16 reg, u8 val)
{
	struct platform_device *pdev = dev->pdev;
	struct zd1301_demod_platform_data *pdata = pdev->dev.platform_data;

	return pdata->reg_write(pdata->reg_priv, reg, val);
}

static int zd1301_demod_rreg(struct zd1301_demod_dev *dev, u16 reg, u8 *val)
{
	struct platform_device *pdev = dev->pdev;
	struct zd1301_demod_platform_data *pdata = pdev->dev.platform_data;

	return pdata->reg_read(pdata->reg_priv, reg, val);
}

static int zd1301_demod_set_frontend(struct dvb_frontend *fe)
{
	struct zd1301_demod_dev *dev = fe->demodulator_priv;
	struct platform_device *pdev = dev->pdev;
	struct dtv_frontend_properties *c = &fe->dtv_property_cache;
	int ret;
	u32 if_frequency;
	u8 r6a50_val;

	dev_dbg(&pdev->dev, "frequency=%u bandwidth_hz=%u\n",
		c->frequency, c->bandwidth_hz);

	/* Program tuner */
	if (fe->ops.tuner_ops.set_params &&
	    fe->ops.tuner_ops.get_if_frequency) {
		ret = fe->ops.tuner_ops.set_params(fe);
		if (ret)
			goto err;
		ret = fe->ops.tuner_ops.get_if_frequency(fe, &if_frequency);
		if (ret)
			goto err;
	} else {
		ret = -EINVAL;
		goto err;
	}

	dev_dbg(&pdev->dev, "if_frequency=%u\n", if_frequency);
	if (if_frequency != 36150000) {
		ret = -EINVAL;
		goto err;
	}

	switch (c->bandwidth_hz) {
	case 6000000:
		r6a50_val = 0x78;
		break;
	case 7000000:
		r6a50_val = 0x68;
		break;
	case 8000000:
		r6a50_val = 0x58;
		break;
	default:
		ret = -EINVAL;
		goto err;
	}

	ret = zd1301_demod_wreg(dev, 0x6a60, 0x11);
	if (ret)
		goto err;
	ret = zd1301_demod_wreg(dev, 0x6a47, 0x46);
	if (ret)
		goto err;
	ret = zd1301_demod_wreg(dev, 0x6a48, 0x46);
	if (ret)
		goto err;
	ret = zd1301_demod_wreg(dev, 0x6a4a, 0x15);
	if (ret)
		goto err;
	ret = zd1301_demod_wreg(dev, 0x6a4b, 0x63);
	if (ret)
		goto err;
	ret = zd1301_demod_wreg(dev, 0x6a5b, 0x99);
	if (ret)
		goto err;
	ret = zd1301_demod_wreg(dev, 0x6a3b, 0x10);
	if (ret)

Annotation

• Immediate include surface: `zd1301_demod.h`.
• Detected declarations: `struct zd1301_demod_dev`, `function zd1301_demod_wreg`, `function zd1301_demod_rreg`, `function zd1301_demod_set_frontend`, `function zd1301_demod_sleep`, `function zd1301_demod_init`, `function zd1301_demod_get_tune_settings`, `function zd1301_demod_read_status`, `function zd1301_demod_i2c_master_xfer`, `function zd1301_demod_i2c_functionality`.
• Atlas domain: Driver Families / drivers/media.
• Implementation status: integration 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.