drivers/media/dvb-frontends/si21xx.h

File Facts

System

Linux kernel

Corpus path

drivers/media/dvb-frontends/si21xx.h

Extension

.h

Size

830 bytes

Lines

38

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

• linux/dvb/frontend.h
• media/dvb_frontend.h

Detected Declarations

• struct si21xx_config
• function si21xx_writeregister

Annotated Snippet

struct si21xx_config {
	/* the demodulator's i2c address */
	u8 demod_address;

	/* minimum delay before retuning */
	int min_delay_ms;
};

#if IS_REACHABLE(CONFIG_DVB_SI21XX)
extern struct dvb_frontend *si21xx_attach(const struct si21xx_config *config,
						struct i2c_adapter *i2c);
#else
static inline struct dvb_frontend *si21xx_attach(
		const struct si21xx_config *config, struct i2c_adapter *i2c)
{
	printk(KERN_WARNING "%s: driver disabled by Kconfig\n", __func__);
	return NULL;
}
#endif

static inline int si21xx_writeregister(struct dvb_frontend *fe, u8 reg, u8 val)
{
	int r = 0;
	u8 buf[] = {reg, val};
	if (fe->ops.write)
		r = fe->ops.write(fe, buf, 2);
	return r;
}

#endif

Annotation

• Immediate include surface: `linux/dvb/frontend.h`, `media/dvb_frontend.h`.
• Detected declarations: `struct si21xx_config`, `function si21xx_writeregister`.
• 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.