drivers/media/dvb-frontends/si21xx.c

File Facts

System

Linux kernel

Corpus path

drivers/media/dvb-frontends/si21xx.c

Extension

.c

Size

20998 bytes

Lines

948

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

• linux/init.h
• linux/kernel.h
• linux/module.h
• linux/string.h
• linux/slab.h
• linux/jiffies.h
• asm/div64.h
• media/dvb_frontend.h
• si21xx.h

Detected Declarations

• struct si21xx_state
• function si21_writeregs
• function si21_writereg
• function si21_write
• function si21_readreg
• function si21_readregs
• function si21xx_wait_diseqc_idle
• function si21xx_set_symbolrate
• function si21xx_send_diseqc_msg
• function si21xx_send_diseqc_burst
• function si21xx_set_tone
• function si21xx_set_voltage
• function si21xx_init
• function si21_read_status
• function si21_read_signal_strength
• function si21_read_ber
• function si21_read_snr
• function si21_read_ucblocks
• function si21xx_setacquire
• function si21xx_set_frontend
• function si21xx_sleep
• function si21xx_release
• export si21xx_attach

Annotated Snippet

struct si21xx_state {
	struct i2c_adapter *i2c;
	const struct si21xx_config *config;
	struct dvb_frontend frontend;
	u8 initialised:1;
	int errmode;
	int fs;			/*Sampling rate of the ADC in MHz*/
};

/*	register default initialization */
static u8 serit_sp1511lhb_inittab[] = {
	0x01, 0x28,	/* set i2c_inc_disable */
	0x20, 0x03,
	0x27, 0x20,
	0xe0, 0x45,
	0xe1, 0x08,
	0xfe, 0x01,
	0x01, 0x28,
	0x89, 0x09,
	0x04, 0x80,
	0x05, 0x01,
	0x06, 0x00,
	0x20, 0x03,
	0x24, 0x88,
	0x29, 0x09,
	0x2a, 0x0f,
	0x2c, 0x10,
	0x2d, 0x19,
	0x2e, 0x08,
	0x2f, 0x10,
	0x30, 0x19,
	0x34, 0x20,
	0x35, 0x03,
	0x45, 0x02,
	0x46, 0x45,
	0x47, 0xd0,
	0x48, 0x00,
	0x49, 0x40,
	0x4a, 0x03,
	0x4c, 0xfd,
	0x4f, 0x2e,
	0x50, 0x2e,
	0x51, 0x10,
	0x52, 0x10,
	0x56, 0x92,
	0x59, 0x00,
	0x5a, 0x2d,
	0x5b, 0x33,
	0x5c, 0x1f,
	0x5f, 0x76,
	0x62, 0xc0,
	0x63, 0xc0,
	0x64, 0xf3,
	0x65, 0xf3,
	0x79, 0x40,
	0x6a, 0x40,
	0x6b, 0x0a,
	0x6c, 0x80,
	0x6d, 0x27,
	0x71, 0x06,
	0x75, 0x60,
	0x78, 0x00,
	0x79, 0xb5,
	0x7c, 0x05,
	0x7d, 0x1a,
	0x87, 0x55,
	0x88, 0x72,
	0x8f, 0x08,
	0x90, 0xe0,
	0x94, 0x40,
	0xa0, 0x3f,
	0xa1, 0xc0,
	0xa4, 0xcc,
	0xa5, 0x66,
	0xa6, 0x66,
	0xa7, 0x7b,
	0xa8, 0x7b,
	0xa9, 0x7b,
	0xaa, 0x9a,
	0xed, 0x04,
	0xad, 0x00,
	0xae, 0x03,
	0xcc, 0xab,
	0x01, 0x08,
	0xff, 0xff
};

/*	low level read/writes */
static int si21_writeregs(struct si21xx_state *state, u8 reg1,
							u8 *data, int len)

Annotation

• Immediate include surface: `linux/init.h`, `linux/kernel.h`, `linux/module.h`, `linux/string.h`, `linux/slab.h`, `linux/jiffies.h`, `asm/div64.h`, `media/dvb_frontend.h`.
• Detected declarations: `struct si21xx_state`, `function si21_writeregs`, `function si21_writereg`, `function si21_write`, `function si21_readreg`, `function si21_readregs`, `function si21xx_wait_diseqc_idle`, `function si21xx_set_symbolrate`, `function si21xx_send_diseqc_msg`, `function si21xx_send_diseqc_burst`.
• 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.