drivers/media/dvb-frontends/isl6405.c

File Facts

System

Linux kernel

Corpus path

drivers/media/dvb-frontends/isl6405.c

Extension

.c

Size

3666 bytes

Lines

149

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/delay.h
• linux/errno.h
• linux/init.h
• linux/kernel.h
• linux/module.h
• linux/string.h
• linux/slab.h
• media/dvb_frontend.h
• isl6405.h

Detected Declarations

• struct isl6405
• function isl6405_set_voltage
• function isl6405_enable_high_lnb_voltage
• function isl6405_release
• export isl6405_attach

Annotated Snippet

struct isl6405 {
	u8			config;
	u8			override_or;
	u8			override_and;
	struct i2c_adapter	*i2c;
	u8			i2c_addr;
};

static int isl6405_set_voltage(struct dvb_frontend *fe,
			       enum fe_sec_voltage voltage)
{
	struct isl6405 *isl6405 = (struct isl6405 *) fe->sec_priv;
	struct i2c_msg msg = {	.addr = isl6405->i2c_addr, .flags = 0,
				.buf = &isl6405->config,
				.len = sizeof(isl6405->config) };

	if (isl6405->override_or & 0x80) {
		isl6405->config &= ~(ISL6405_VSEL2 | ISL6405_EN2);
		switch (voltage) {
		case SEC_VOLTAGE_OFF:
			break;
		case SEC_VOLTAGE_13:
			isl6405->config |= ISL6405_EN2;
			break;
		case SEC_VOLTAGE_18:
			isl6405->config |= (ISL6405_EN2 | ISL6405_VSEL2);
			break;
		default:
			return -EINVAL;
		}
	} else {
		isl6405->config &= ~(ISL6405_VSEL1 | ISL6405_EN1);
		switch (voltage) {
		case SEC_VOLTAGE_OFF:
			break;
		case SEC_VOLTAGE_13:
			isl6405->config |= ISL6405_EN1;
			break;
		case SEC_VOLTAGE_18:
			isl6405->config |= (ISL6405_EN1 | ISL6405_VSEL1);
			break;
		default:
			return -EINVAL;
		}
	}
	isl6405->config |= isl6405->override_or;
	isl6405->config &= isl6405->override_and;

	return (i2c_transfer(isl6405->i2c, &msg, 1) == 1) ? 0 : -EIO;
}

static int isl6405_enable_high_lnb_voltage(struct dvb_frontend *fe, long arg)
{
	struct isl6405 *isl6405 = (struct isl6405 *) fe->sec_priv;
	struct i2c_msg msg = {	.addr = isl6405->i2c_addr, .flags = 0,
				.buf = &isl6405->config,
				.len = sizeof(isl6405->config) };

	if (isl6405->override_or & 0x80) {
		if (arg)
			isl6405->config |= ISL6405_LLC2;
		else
			isl6405->config &= ~ISL6405_LLC2;
	} else {
		if (arg)
			isl6405->config |= ISL6405_LLC1;
		else
			isl6405->config &= ~ISL6405_LLC1;
	}
	isl6405->config |= isl6405->override_or;
	isl6405->config &= isl6405->override_and;

	return (i2c_transfer(isl6405->i2c, &msg, 1) == 1) ? 0 : -EIO;
}

static void isl6405_release(struct dvb_frontend *fe)
{
	/* power off */
	isl6405_set_voltage(fe, SEC_VOLTAGE_OFF);

	/* free */
	kfree(fe->sec_priv);
	fe->sec_priv = NULL;
}

struct dvb_frontend *isl6405_attach(struct dvb_frontend *fe, struct i2c_adapter *i2c,
				    u8 i2c_addr, u8 override_set, u8 override_clear)
{
	struct isl6405 *isl6405 = kmalloc_obj(struct isl6405);
	if (!isl6405)

Annotation

• Immediate include surface: `linux/delay.h`, `linux/errno.h`, `linux/init.h`, `linux/kernel.h`, `linux/module.h`, `linux/string.h`, `linux/slab.h`, `media/dvb_frontend.h`.
• Detected declarations: `struct isl6405`, `function isl6405_set_voltage`, `function isl6405_enable_high_lnb_voltage`, `function isl6405_release`, `export isl6405_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.