drivers/media/tuners/tua9001.c

Source file repositories/reference/linux-study-clean/drivers/media/tuners/tua9001.c

File Facts

System
Linux kernel
Corpus path
drivers/media/tuners/tua9001.c
Extension
.c
Size
5622 bytes
Lines
268
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

switch (c->bandwidth_hz) {
		case 8000000:
			val  = 0x0000;
			break;
		case 7000000:
			val  = 0x1000;
			break;
		case 6000000:
			val  = 0x2000;
			break;
		case 5000000:
			val  = 0x3000;
			break;
		default:
			ret = -EINVAL;
			goto err;
		}
		break;
	default:
		ret = -EINVAL;
		goto err;
	}

	data[0].reg = 0x04;
	data[0].val = val;
	data[1].reg = 0x1f;
	data[1].val = div_u64((u64) (c->frequency - 150000000) * 48, 1000000);

	if (fe->callback) {
		ret = fe->callback(client->adapter,
				   DVB_FRONTEND_COMPONENT_TUNER,
				   TUA9001_CMD_RXEN, 0);
		if (ret)
			goto err;
	}

	for (i = 0; i < ARRAY_SIZE(data); i++) {
		ret = regmap_write(dev->regmap, data[i].reg, data[i].val);
		if (ret)
			goto err;
	}

	if (fe->callback) {
		ret = fe->callback(client->adapter,
				   DVB_FRONTEND_COMPONENT_TUNER,
				   TUA9001_CMD_RXEN, 1);
		if (ret)
			goto err;
	}
	return 0;
err:
	dev_dbg(&client->dev, "failed=%d\n", ret);
	return ret;
}

static int tua9001_get_if_frequency(struct dvb_frontend *fe, u32 *frequency)
{
	struct tua9001_dev *dev = fe->tuner_priv;
	struct i2c_client *client = dev->client;

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

	*frequency = 0; /* Zero-IF */
	return 0;
}

static const struct dvb_tuner_ops tua9001_tuner_ops = {
	.info = {
		.name             = "Infineon TUA9001",
		.frequency_min_hz = 170 * MHz,
		.frequency_max_hz = 862 * MHz,
	},

	.init = tua9001_init,
	.sleep = tua9001_sleep,
	.set_params = tua9001_set_params,

	.get_if_frequency = tua9001_get_if_frequency,
};

static int tua9001_probe(struct i2c_client *client)
{
	struct tua9001_dev *dev;
	struct tua9001_platform_data *pdata = client->dev.platform_data;
	struct dvb_frontend *fe = pdata->dvb_frontend;
	int ret;
	static const struct regmap_config regmap_config = {
		.reg_bits =  8,
		.val_bits = 16,
	};

Annotation

Implementation Notes