drivers/media/tuners/tuner-simple.c

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

File Facts

System
Linux kernel
Corpus path
drivers/media/tuners/tuner-simple.c
Extension
.c
Size
29450 bytes
Lines
1145
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.

Dependency Surface

Detected Declarations

Annotated Snippet

struct tuner_simple_priv {
	unsigned int nr;
	u16 last_div;

	struct tuner_i2c_props i2c_props;
	struct list_head hybrid_tuner_instance_list;

	unsigned int type;
	const struct tunertype *tun;

	u32 frequency;
	u32 bandwidth;
	bool radio_mode;
};

/* ---------------------------------------------------------------------- */

static int tuner_read_status(struct dvb_frontend *fe)
{
	struct tuner_simple_priv *priv = fe->tuner_priv;
	unsigned char byte;

	if (1 != tuner_i2c_xfer_recv(&priv->i2c_props, &byte, 1))
		return 0;

	return byte;
}

static inline int tuner_signal(const int status)
{
	return (status & TUNER_SIGNAL) << 13;
}

static inline int tuner_stereo(const int type, const int status)
{
	switch (type) {
	case TUNER_PHILIPS_FM1216ME_MK3:
	case TUNER_PHILIPS_FM1236_MK3:
	case TUNER_PHILIPS_FM1256_IH3:
	case TUNER_LG_NTSC_TAPE:
	case TUNER_TCL_MF02GIP_5N:
		return ((status & TUNER_SIGNAL) == TUNER_STEREO_MK3);
	case TUNER_PHILIPS_FM1216MK5:
		return status | TUNER_STEREO;
	default:
		return status & TUNER_STEREO;
	}
}

static inline int tuner_islocked(const int status)
{
	return (status & TUNER_FL);
}

static inline int tuner_afcstatus(const int status)
{
	return (status & TUNER_AFC) - 2;
}


static int simple_get_status(struct dvb_frontend *fe, u32 *status)
{
	struct tuner_simple_priv *priv = fe->tuner_priv;
	int tuner_status;

	if (priv->i2c_props.adap == NULL)
		return -EINVAL;

	tuner_status = tuner_read_status(fe);

	*status = 0;

	if (tuner_islocked(tuner_status))
		*status = TUNER_STATUS_LOCKED;
	if (tuner_stereo(priv->type, tuner_status))
		*status |= TUNER_STATUS_STEREO;

	tuner_dbg("AFC Status: %d\n", tuner_afcstatus(tuner_status));

	return 0;
}

static int simple_get_rf_strength(struct dvb_frontend *fe, u16 *strength)
{
	struct tuner_simple_priv *priv = fe->tuner_priv;
	int signal;

	if (priv->i2c_props.adap == NULL || !priv->radio_mode)
		return -EINVAL;

Annotation

Implementation Notes