drivers/media/dvb-frontends/bsbe1.h

Source file repositories/reference/linux-study-clean/drivers/media/dvb-frontends/bsbe1.h

File Facts

System
Linux kernel
Corpus path
drivers/media/dvb-frontends/bsbe1.h
Extension
.h
Size
2606 bytes
Lines
90
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.

Dependency Surface

Detected Declarations

Annotated Snippet

else if (srate < 3000000) { aclk = 0xb7; bclk = 0x4b; }
	else if (srate < 7000000) { aclk = 0xb7; bclk = 0x4f; }
	else if (srate < 14000000) { aclk = 0xb7; bclk = 0x53; }
	else if (srate < 30000000) { aclk = 0xb6; bclk = 0x53; }
	else if (srate < 45000000) { aclk = 0xb4; bclk = 0x51; }

	stv0299_writereg(fe, 0x13, aclk);
	stv0299_writereg(fe, 0x14, bclk);
	stv0299_writereg(fe, 0x1f, (ratio >> 16) & 0xff);
	stv0299_writereg(fe, 0x20, (ratio >>  8) & 0xff);
	stv0299_writereg(fe, 0x21, (ratio      ) & 0xf0);

	return 0;
}

static int alps_bsbe1_tuner_set_params(struct dvb_frontend *fe)
{
	struct dtv_frontend_properties *p = &fe->dtv_property_cache;
	int ret;
	u8 data[4];
	u32 div;
	struct i2c_msg msg = { .addr = 0x61, .flags = 0, .buf = data, .len = sizeof(data) };
	struct i2c_adapter *i2c = fe->tuner_priv;

	if ((p->frequency < 950000) || (p->frequency > 2150000))
		return -EINVAL;

	div = p->frequency / 1000;
	data[0] = (div >> 8) & 0x7f;
	data[1] = div & 0xff;
	data[2] = 0x80 | ((div & 0x18000) >> 10) | 0x1;
	data[3] = 0xe0;

	if (fe->ops.i2c_gate_ctrl)
		fe->ops.i2c_gate_ctrl(fe, 1);
	ret = i2c_transfer(i2c, &msg, 1);
	return (ret != 1) ? -EIO : 0;
}

static struct stv0299_config alps_bsbe1_config = {
	.demod_address = 0x68,
	.inittab = alps_bsbe1_inittab,
	.mclk = 88000000UL,
	.invert = 1,
	.skip_reinit = 0,
	.min_delay_ms = 100,
	.set_symbol_rate = alps_bsbe1_set_symbol_rate,
};

#endif

Annotation

Implementation Notes