drivers/media/dvb-frontends/stb6000.c

File Facts

System

Linux kernel

Corpus path

drivers/media/dvb-frontends/stb6000.c

Extension

.c

Size

4749 bytes

Lines

243

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/slab.h
• linux/module.h
• linux/dvb/frontend.h
• asm/types.h
• stb6000.h

Detected Declarations

• struct stb6000_priv
• function stb6000_release
• function stb6000_sleep
• function stb6000_set_params
• function stb6000_get_frequency
• export stb6000_attach

Annotated Snippet

struct stb6000_priv {
	/* i2c details */
	int i2c_address;
	struct i2c_adapter *i2c;
	u32 frequency;
};

static void stb6000_release(struct dvb_frontend *fe)
{
	kfree(fe->tuner_priv);
	fe->tuner_priv = NULL;
}

static int stb6000_sleep(struct dvb_frontend *fe)
{
	struct stb6000_priv *priv = fe->tuner_priv;
	int ret;
	u8 buf[] = { 10, 0 };
	struct i2c_msg msg = {
		.addr = priv->i2c_address,
		.flags = 0,
		.buf = buf,
		.len = 2
	};

	dprintk("%s:\n", __func__);

	if (fe->ops.i2c_gate_ctrl)
		fe->ops.i2c_gate_ctrl(fe, 1);

	ret = i2c_transfer(priv->i2c, &msg, 1);
	if (ret != 1)
		dprintk("%s: i2c error\n", __func__);

	if (fe->ops.i2c_gate_ctrl)
		fe->ops.i2c_gate_ctrl(fe, 0);

	return (ret == 1) ? 0 : ret;
}

static int stb6000_set_params(struct dvb_frontend *fe)
{
	struct dtv_frontend_properties *p = &fe->dtv_property_cache;
	struct stb6000_priv *priv = fe->tuner_priv;
	unsigned int n, m;
	int ret;
	u32 freq_mhz;
	int bandwidth;
	u8 buf[12];
	struct i2c_msg msg = {
		.addr = priv->i2c_address,
		.flags = 0,
		.buf = buf,
		.len = 12
	};

	dprintk("%s:\n", __func__);

	freq_mhz = p->frequency / 1000;
	bandwidth = p->symbol_rate / 1000000;

	if (bandwidth > 31)
		bandwidth = 31;

	if ((freq_mhz > 949) && (freq_mhz < 2151)) {
		buf[0] = 0x01;
		buf[1] = 0xac;
		if (freq_mhz < 1950)
			buf[1] = 0xaa;
		if (freq_mhz < 1800)
			buf[1] = 0xa8;
		if (freq_mhz < 1650)
			buf[1] = 0xa6;
		if (freq_mhz < 1530)
			buf[1] = 0xa5;
		if (freq_mhz < 1470)
			buf[1] = 0xa4;
		if (freq_mhz < 1370)
			buf[1] = 0xa2;
		if (freq_mhz < 1300)
			buf[1] = 0xa1;
		if (freq_mhz < 1200)
			buf[1] = 0xa0;
		if (freq_mhz < 1075)
			buf[1] = 0xbc;
		if (freq_mhz < 1000)
			buf[1] = 0xba;
		if (freq_mhz < 1075) {
			n = freq_mhz / 8; /* vco=lo*4 */
			m = 2;

Annotation

• Immediate include surface: `linux/slab.h`, `linux/module.h`, `linux/dvb/frontend.h`, `asm/types.h`, `stb6000.h`.
• Detected declarations: `struct stb6000_priv`, `function stb6000_release`, `function stb6000_sleep`, `function stb6000_set_params`, `function stb6000_get_frequency`, `export stb6000_attach`.
• 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.