lgdt330x.c

linux-2.6.15.6

	state->current_frequency = param->frequency;

	lgdt330x_SwReset(state);
	return 0;
}

static int lgdt330x_get_frontend(struct dvb_frontend* fe,
				 struct dvb_frontend_parameters* param)
{
	struct lgdt330x_state *state = fe->demodulator_priv;
	param->frequency = state->current_frequency;
	return 0;
}

static int lgdt3302_read_status(struct dvb_frontend* fe, fe_status_t* status)
{
	struct lgdt330x_state* state = fe->demodulator_priv;
	u8 buf[3];

	*status = 0; /* Reset status result */

	/* AGC status register */
	i2c_read_demod_bytes(state, AGC_STATUS, buf, 1);
	dprintk("%s: AGC_STATUS = 0x%02x\n", __FUNCTION__, buf[0]);
	if ((buf[0] & 0x0c) == 0x8){
		/* Test signal does not exist flag */
		/* as well as the AGC lock flag.   */
		*status |= FE_HAS_SIGNAL;
	} else {
		/* Without a signal all other status bits are meaningless */
		return 0;
	}

	/*
	 * You must set the Mask bits to 1 in the IRQ_MASK in order
	 * to see that status bit in the IRQ_STATUS register.
	 * This is done in SwReset();
	 */
	/* signal status */
	i2c_read_demod_bytes(state, TOP_CONTROL, buf, sizeof(buf));
	dprintk("%s: TOP_CONTROL = 0x%02x, IRO_MASK = 0x%02x, IRQ_STATUS = 0x%02x\n", __FUNCTION__, buf[0], buf[1], buf[2]);


	/* sync status */
	if ((buf[2] & 0x03) == 0x01) {
		*status |= FE_HAS_SYNC;
	}

	/* FEC error status */
	if ((buf[2] & 0x0c) == 0x08) {
		*status |= FE_HAS_LOCK;
		*status |= FE_HAS_VITERBI;
	}

	/* Carrier Recovery Lock Status Register */
	i2c_read_demod_bytes(state, CARRIER_LOCK, buf, 1);
	dprintk("%s: CARRIER_LOCK = 0x%02x\n", __FUNCTION__, buf[0]);
	switch (state->current_modulation) {
	case QAM_256:
	case QAM_64:
		/* Need to undestand why there are 3 lock levels here */
		if ((buf[0] & 0x07) == 0x07)
			*status |= FE_HAS_CARRIER;
		break;
	case VSB_8:
		if ((buf[0] & 0x80) == 0x80)
			*status |= FE_HAS_CARRIER;
		break;
	default:
		printk("KERN_WARNING lgdt330x: %s: Modulation set to unsupported value\n", __FUNCTION__);
	}

	return 0;
}

static int lgdt3303_read_status(struct dvb_frontend* fe, fe_status_t* status)
{
	struct lgdt330x_state* state = fe->demodulator_priv;
	int err;
	u8 buf[3];

	*status = 0; /* Reset status result */

	/* lgdt3303 AGC status register */
	err = i2c_read_demod_bytes(state, 0x58, buf, 1);
	if (err < 0)
		return err;

	dprintk("%s: AGC_STATUS = 0x%02x\n", __FUNCTION__, buf[0]);
	if ((buf[0] & 0x21) == 0x01){
		/* Test input signal does not exist flag */
		/* as well as the AGC lock flag.   */
		*status |= FE_HAS_SIGNAL;
	} else {
		/* Without a signal all other status bits are meaningless */
		return 0;
	}

	/* Carrier Recovery Lock Status Register */
	i2c_read_demod_bytes(state, CARRIER_LOCK, buf, 1);
	dprintk("%s: CARRIER_LOCK = 0x%02x\n", __FUNCTION__, buf[0]);
	switch (state->current_modulation) {
	case QAM_256:
	case QAM_64:
		/* Need to undestand why there are 3 lock levels here */
		if ((buf[0] & 0x07) == 0x07)
			*status |= FE_HAS_CARRIER;
		else
			break;
		i2c_read_demod_bytes(state, 0x8a, buf, 1);
		if ((buf[0] & 0x04) == 0x04)
			*status |= FE_HAS_SYNC;
		if ((buf[0] & 0x01) == 0x01)
			*status |= FE_HAS_LOCK;
		if ((buf[0] & 0x08) == 0x08)
			*status |= FE_HAS_VITERBI;
		break;
	case VSB_8:
		if ((buf[0] & 0x80) == 0x80)
			*status |= FE_HAS_CARRIER;
		else
			break;
		i2c_read_demod_bytes(state, 0x38, buf, 1);
		if ((buf[0] & 0x02) == 0x00)
			*status |= FE_HAS_SYNC;
		if ((buf[0] & 0x01) == 0x01) {
			*status |= FE_HAS_LOCK;
			*status |= FE_HAS_VITERBI;
		}
		break;
	default:
		printk("KERN_WARNING lgdt330x: %s: Modulation set to unsupported value\n", __FUNCTION__);
	}
	return 0;
}

static int lgdt330x_read_signal_strength(struct dvb_frontend* fe, u16* strength)
{
	/* not directly available. */
	*strength = 0;
	return 0;
}

static int lgdt3302_read_snr(struct dvb_frontend* fe, u16* snr)
{
#ifdef SNR_IN_DB
	/*
	 * Spec sheet shows formula for SNR_EQ = 10 log10(25 * 24**2 / noise)
	 * and SNR_PH = 10 log10(25 * 32**2 / noise) for equalizer and phase tracker
	 * respectively. The following tables are built on these formulas.
	 * The usual definition is SNR = 20 log10(signal/noise)
	 * If the specification is wrong the value retuned is 1/2 the actual SNR in db.
	 *
	 * This table is a an ordered list of noise values computed by the
	 * formula from the spec sheet such that the index into the table
	 * starting at 43 or 45 is the SNR value in db. There are duplicate noise
	 * value entries at the beginning because the SNR varies more than
	 * 1 db for a change of 1 digit in noise at very small values of noise.
	 *
	 * Examples from SNR_EQ table:
	 * noise SNR
	 *   0    43
	 *   1    42
	 *   2    39
	 *   3    37
	 *   4    36
	 *   5    35
	 *   6    34
	 *   7    33
	 *   8    33
	 *   9    32
	 *   10   32
	 *   11   31
	 *   12   31
	 *   13   30
	 */

	static const u32 SNR_EQ[] =
		{ 1,     2,      2,      2, 3,      3,      4,     4,     5,     7,
		  9,     11,     13,     17, 21,     26,     33,    41,    52,    65,
		  81,    102,    129,    162, 204,    257,    323,   406,   511,   644,
		  810,   1020,   1284,   1616, 2035,   2561,   3224,  4059,  5110,  6433,
		  8098,  10195,  12835,  16158, 20341,  25608,  32238, 40585, 51094, 64323,
		  80978, 101945, 128341, 161571, 203406, 256073, 0x40000
		};

	static const u32 SNR_PH[] =
		{ 1,     2,      2,      2,      3,      3,     4,     5,     6,     8,
		  10,    12,     15,     19,     23,     29, 37,    46,    58,    73,
		  91,    115,    144,    182,    229,    288, 362,   456,   574,   722,
		  909,   1144,   1440,   1813,   2282,   2873, 3617,  4553,  5732,  7216,
		  9084,  11436,  14396,  18124,  22817,  28724,  36161, 45524, 57312, 72151,
		  90833, 114351, 143960, 181235, 228161, 0x080000
		};

	static u8 buf[5];/* read data buffer */
	static u32 noise;   /* noise value */
	static u32 snr_db;  /* index into SNR_EQ[] */
	struct lgdt330x_state* state = (struct lgdt330x_state*) fe->demodulator_priv;

	/* read both equalizer and phase tracker noise data */
	i2c_read_demod_bytes(state, EQPH_ERR0, buf, sizeof(buf));

	if (state->current_modulation == VSB_8) {
		/* Equalizer Mean-Square Error Register for VSB */
		noise = ((buf[0] & 7) << 16) | (buf[1] << 8) | buf[2];

		/*
		 * Look up noise value in table.
		 * A better search algorithm could be used...
		 * watch out there are duplicate entries.
		 */
		for (snr_db = 0; snr_db < sizeof(SNR_EQ); snr_db++) {
			if (noise < SNR_EQ[snr_db]) {
				*snr = 43 - snr_db;
				break;
			}
		}
	} else {
		/* Phase Tracker Mean-Square Error Register for QAM */
		noise = ((buf[0] & 7<<3) << 13) | (buf[3] << 8) | buf[4];

		/* Look up noise value in table. */
		for (snr_db = 0; snr_db < sizeof(SNR_PH); snr_db++) {
			if (noise < SNR_PH[snr_db]) {
				*snr = 45 - snr_db;
				break;
			}
		}
	}
#else
	/* Return the raw noise value */
	static u8 buf[5];/* read data buffer */
	static u32 noise;   /* noise value */
	struct lgdt330x_state* state = (struct lgdt330x_state*) fe->demodulator_priv;

	/* read both equalizer and pase tracker noise data */
	i2c_read_demod_bytes(state, EQPH_ERR0, buf, sizeof(buf));

	if (state->current_modulation == VSB_8) {
		/* Phase Tracker Mean-Square Error Register for VSB */
		noise = ((buf[0] & 7<<3) << 13) | (buf[3] << 8) | buf[4];
	} else {

		/* Carrier Recovery Mean-Square Error for QAM */
		i2c_read_demod_bytes(state, 0x1a, buf, 2);
		noise = ((buf[0] & 3) << 8) | buf[1];
	}

	/* Small values for noise mean signal is better so invert noise */
	*snr = ~noise;
#endif

	dprintk("%s: noise = 0x%05x, snr = %idb\n",__FUNCTION__, noise, *snr);

	return 0;
}

static int lgdt3303_read_snr(struct dvb_frontend* fe, u16* snr)
{
	/* Return the raw noise value */
	static u8 buf[5];/* read data buffer */
	static u32 noise;   /* noise value */
	struct lgdt330x_state* state = (struct lgdt330x_state*) fe->demodulator_priv;

	if (state->current_modulation == VSB_8) {

		/* Phase Tracker Mean-Square Error Register for VSB */
		noise = ((buf[0] & 7) << 16) | (buf[3] << 8) | buf[4];
	} else {

		/* Carrier Recovery Mean-Square Error for QAM */
		i2c_read_demod_bytes(state, 0x1a, buf, 2);
		noise = (buf[0] << 8) | buf[1];
	}

	/* Small values for noise mean signal is better so invert noise */
	*snr = ~noise;

	dprintk("%s: noise = 0x%05x, snr = %idb\n",__FUNCTION__, noise, *snr);

	return 0;
}

static int lgdt330x_get_tune_settings(struct dvb_frontend* fe, struct dvb_frontend_tune_settings* fe_tune_settings)
{
	/* I have no idea about this - it may not be needed */
	fe_tune_settings->min_delay_ms = 500;
	fe_tune_settings->step_size = 0;
	fe_tune_settings->max_drift = 0;
	return 0;
}

static void lgdt330x_release(struct dvb_frontend* fe)
{
	struct lgdt330x_state* state = (struct lgdt330x_state*) fe->demodulator_priv;
	kfree(state);
}

static struct dvb_frontend_ops lgdt3302_ops;
static struct dvb_frontend_ops lgdt3303_ops;

struct dvb_frontend* lgdt330x_attach(const struct lgdt330x_config* config,
				     struct i2c_adapter* i2c)
{
	struct lgdt330x_state* state = NULL;
	u8 buf[1];

	/* Allocate memory for the internal state */
	state = (struct lgdt330x_state*) kmalloc(sizeof(struct lgdt330x_state), GFP_KERNEL);
	if (state == NULL)
		goto error;
	memset(state,0,sizeof(*state));

	/* Setup the state */
	state->config = config;
	state->i2c = i2c;
	switch (config->demod_chip) {
	case LGDT3302:
		memcpy(&state->ops, &lgdt3302_ops, sizeof(struct dvb_frontend_ops));
		break;
	case LGDT3303:
		memcpy(&state->ops, &lgdt3303_ops, sizeof(struct dvb_frontend_ops));
		break;
	default:
		goto error;
	}

	/* Verify communication with demod chip */
	if (i2c_read_demod_bytes(state, 2, buf, 1))
		goto error;

	state->current_frequency = -1;
	state->current_modulation = -1;

	/* Create dvb_frontend */
	state->frontend.ops = &state->ops;
	state->frontend.demodulator_priv = state;
	return &state->frontend;

error:
	kfree(state);
	dprintk("%s: ERROR\n",__FUNCTION__);
	return NULL;
}

static struct dvb_frontend_ops lgdt3302_ops = {
	.info = {
		.name= "LG Electronics LGDT3302 VSB/QAM Frontend",
		.type = FE_ATSC,
		.frequency_min= 54000000,
		.frequency_max= 858000000,
		.frequency_stepsize= 62500,
		.symbol_rate_min    = 5056941,	/* QAM 64 */
		.symbol_rate_max    = 10762000,	/* VSB 8  */
		.caps = FE_CAN_QAM_64 | FE_CAN_QAM_256 | FE_CAN_8VSB
	},
	.init                 = lgdt330x_init,
	.set_frontend         = lgdt330x_set_parameters,
	.get_frontend         = lgdt330x_get_frontend,
	.get_tune_settings    = lgdt330x_get_tune_settings,
	.read_status          = lgdt3302_read_status,
	.read_ber             = lgdt330x_read_ber,
	.read_signal_strength = lgdt330x_read_signal_strength,
	.read_snr             = lgdt3302_read_snr,
	.read_ucblocks        = lgdt330x_read_ucblocks,
	.release              = lgdt330x_release,
};

static struct dvb_frontend_ops lgdt3303_ops = {
	.info = {
		.name= "LG Electronics LGDT3303 VSB/QAM Frontend",
		.type = FE_ATSC,
		.frequency_min= 54000000,
		.frequency_max= 858000000,
		.frequency_stepsize= 62500,
		.symbol_rate_min    = 5056941,	/* QAM 64 */
		.symbol_rate_max    = 10762000,	/* VSB 8  */
		.caps = FE_CAN_QAM_64 | FE_CAN_QAM_256 | FE_CAN_8VSB
	},
	.init                 = lgdt330x_init,
	.set_frontend         = lgdt330x_set_parameters,
	.get_frontend         = lgdt330x_get_frontend,
	.get_tune_settings    = lgdt330x_get_tune_settings,
	.read_status          = lgdt3303_read_status,
	.read_ber             = lgdt330x_read_ber,
	.read_signal_strength = lgdt330x_read_signal_strength,
	.read_snr             = lgdt3303_read_snr,
	.read_ucblocks        = lgdt330x_read_ucblocks,
	.release              = lgdt330x_release,
};

MODULE_DESCRIPTION("LGDT330X (ATSC 8VSB & ITU-T J.83 AnnexB 64/256 QAM) Demodulator Driver");
MODULE_AUTHOR("Wilson Michaels");
MODULE_LICENSE("GPL");

EXPORT_SYMBOL(lgdt330x_attach);

/*
 * Local variables:
 * c-basic-offset: 8
 * End:
 */