drivers/media/dvb-frontends/cxd2820r_t2.c

Source file repositories/reference/linux-study-clean/drivers/media/dvb-frontends/cxd2820r_t2.c

File Facts

System
Linux kernel
Corpus path
drivers/media/dvb-frontends/cxd2820r_t2.c
Extension
.c
Size
9360 bytes
Lines
421
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

if ((buf[0] >> 4) & 0x01) {
			post_bit_error = buf[0] << 24 | buf[1] << 16 |
					 buf[2] << 8 | buf[3] << 0;
			post_bit_error &= 0x0fffffff;
		} else {
			post_bit_error = 0;
		}

		priv->post_bit_error += post_bit_error;

		c->post_bit_error.len = 1;
		c->post_bit_error.stat[0].scale = FE_SCALE_COUNTER;
		c->post_bit_error.stat[0].uvalue = priv->post_bit_error;
	} else {
		c->post_bit_error.len = 1;
		c->post_bit_error.stat[0].scale = FE_SCALE_NOT_AVAILABLE;
	}

	return ret;
error:
	dev_dbg(&client->dev, "failed=%d\n", ret);
	return ret;
}

int cxd2820r_sleep_t2(struct dvb_frontend *fe)
{
	struct cxd2820r_priv *priv = fe->demodulator_priv;
	struct i2c_client *client = priv->client[0];
	int ret;
	static const struct reg_val_mask tab[] = {
		{ 0x000ff, 0x1f, 0xff },
		{ 0x00085, 0x00, 0xff },
		{ 0x00088, 0x01, 0xff },
		{ 0x02069, 0x00, 0xff },
		{ 0x00081, 0x00, 0xff },
		{ 0x00080, 0x00, 0xff },
	};

	dev_dbg(&client->dev, "\n");

	ret = cxd2820r_wr_reg_val_mask_tab(priv, tab, ARRAY_SIZE(tab));
	if (ret)
		goto error;

	priv->delivery_system = SYS_UNDEFINED;

	return ret;
error:
	dev_dbg(&client->dev, "failed=%d\n", ret);
	return ret;
}

int cxd2820r_get_tune_settings_t2(struct dvb_frontend *fe,
	struct dvb_frontend_tune_settings *s)
{
	s->min_delay_ms = 1500;
	s->step_size = fe->ops.info.frequency_stepsize_hz * 2;
	s->max_drift = (fe->ops.info.frequency_stepsize_hz * 2) + 1;

	return 0;
}

Annotation

Implementation Notes