drivers/media/usb/dvb-usb/cinergyT2-fe.c

Source file repositories/reference/linux-study-clean/drivers/media/usb/dvb-usb/cinergyT2-fe.c

File Facts

System
Linux kernel
Corpus path
drivers/media/usb/dvb-usb/cinergyT2-fe.c
Extension
.c
Size
7002 bytes
Lines
317
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

struct cinergyt2_fe_state {
	struct dvb_frontend fe;
	struct dvb_usb_device *d;

	unsigned char data[64];
	struct mutex data_mutex;

	struct dvbt_get_status_msg status;
};

static int cinergyt2_fe_read_status(struct dvb_frontend *fe,
				    enum fe_status *status)
{
	struct cinergyt2_fe_state *state = fe->demodulator_priv;
	int ret;

	mutex_lock(&state->data_mutex);
	state->data[0] = CINERGYT2_EP1_GET_TUNER_STATUS;

	ret = dvb_usb_generic_rw(state->d, state->data, 1,
				 state->data, sizeof(state->status), 0);
	if (!ret)
		memcpy(&state->status, state->data, sizeof(state->status));
	mutex_unlock(&state->data_mutex);

	if (ret < 0)
		return ret;

	*status = 0;

	if (0xffff - le16_to_cpu(state->status.gain) > 30)
		*status |= FE_HAS_SIGNAL;
	if (state->status.lock_bits & (1 << 6))
		*status |= FE_HAS_LOCK;
	if (state->status.lock_bits & (1 << 5))
		*status |= FE_HAS_SYNC;
	if (state->status.lock_bits & (1 << 4))
		*status |= FE_HAS_CARRIER;
	if (state->status.lock_bits & (1 << 1))
		*status |= FE_HAS_VITERBI;

	if ((*status & (FE_HAS_CARRIER | FE_HAS_VITERBI | FE_HAS_SYNC)) !=
			(FE_HAS_CARRIER | FE_HAS_VITERBI | FE_HAS_SYNC))
		*status &= ~FE_HAS_LOCK;

	return 0;
}

static int cinergyt2_fe_read_ber(struct dvb_frontend *fe, u32 *ber)
{
	struct cinergyt2_fe_state *state = fe->demodulator_priv;

	*ber = le32_to_cpu(state->status.viterbi_error_rate);
	return 0;
}

static int cinergyt2_fe_read_unc_blocks(struct dvb_frontend *fe, u32 *unc)
{
	struct cinergyt2_fe_state *state = fe->demodulator_priv;

	*unc = le32_to_cpu(state->status.uncorrected_block_count);
	return 0;
}

static int cinergyt2_fe_read_signal_strength(struct dvb_frontend *fe,
						u16 *strength)
{
	struct cinergyt2_fe_state *state = fe->demodulator_priv;

	*strength = (0xffff - le16_to_cpu(state->status.gain));
	return 0;
}

static int cinergyt2_fe_read_snr(struct dvb_frontend *fe, u16 *snr)
{
	struct cinergyt2_fe_state *state = fe->demodulator_priv;

	*snr = (state->status.snr << 8) | state->status.snr;
	return 0;
}

static int cinergyt2_fe_init(struct dvb_frontend *fe)
{
	return 0;
}

static int cinergyt2_fe_sleep(struct dvb_frontend *fe)
{
	deb_info("cinergyt2_fe_sleep() Called\n");
	return 0;

Annotation

Implementation Notes