s5h1420.c

linux-2.6.15.6

static void s5h1420_reset(struct s5h1420_state* state)
{
	s5h1420_writereg (state, 0x01, 0x08);
	s5h1420_writereg (state, 0x01, 0x00);
	udelay(10);
}

static void s5h1420_setsymbolrate(struct s5h1420_state* state,
				  struct dvb_frontend_parameters *p)
{
	u64 val;

	val = ((u64) p->u.qpsk.symbol_rate / 1000ULL) * (1ULL<<24);
	if (p->u.qpsk.symbol_rate <= 21000000) {
		val *= 2;
	}
	do_div(val, (state->fclk / 1000));

	s5h1420_writereg(state, 0x09, s5h1420_readreg(state, 0x09) & 0x7f);
	s5h1420_writereg(state, 0x11, val >> 16);
	s5h1420_writereg(state, 0x12, val >> 8);
	s5h1420_writereg(state, 0x13, val & 0xff);
	s5h1420_writereg(state, 0x09, s5h1420_readreg(state, 0x09) | 0x80);
}

static u32 s5h1420_getsymbolrate(struct s5h1420_state* state)
{
	u64 val = 0;
	int sampling = 2;

	if (s5h1420_readreg(state, 0x05) & 0x2)
		sampling = 1;

	s5h1420_writereg(state, 0x06, s5h1420_readreg(state, 0x06) | 0x08);
	val  = s5h1420_readreg(state, 0x11) << 16;
	val |= s5h1420_readreg(state, 0x12) << 8;
	val |= s5h1420_readreg(state, 0x13);
	s5h1420_writereg(state, 0x06, s5h1420_readreg(state, 0x06) & 0xf7);

	val *= (state->fclk / 1000ULL);
	do_div(val, ((1<<24) * sampling));

	return (u32) (val * 1000ULL);
}

static void s5h1420_setfreqoffset(struct s5h1420_state* state, int freqoffset)
{
	int val;

	/* remember freqoffset is in kHz, but the chip wants the offset in Hz, so
	 * divide fclk by 1000000 to get the correct value. */
	val = -(int) ((freqoffset * (1<<24)) / (state->fclk / 1000000));

	s5h1420_writereg(state, 0x09, s5h1420_readreg(state, 0x09) & 0xbf);
	s5h1420_writereg(state, 0x0e, val >> 16);
	s5h1420_writereg(state, 0x0f, val >> 8);
	s5h1420_writereg(state, 0x10, val & 0xff);
	s5h1420_writereg(state, 0x09, s5h1420_readreg(state, 0x09) | 0x40);
}

static int s5h1420_getfreqoffset(struct s5h1420_state* state)
{
	int val;

	s5h1420_writereg(state, 0x06, s5h1420_readreg(state, 0x06) | 0x08);
	val  = s5h1420_readreg(state, 0x0e) << 16;
	val |= s5h1420_readreg(state, 0x0f) << 8;
	val |= s5h1420_readreg(state, 0x10);
	s5h1420_writereg(state, 0x06, s5h1420_readreg(state, 0x06) & 0xf7);

	if (val & 0x800000)
		val |= 0xff000000;

	/* remember freqoffset is in kHz, but the chip wants the offset in Hz, so
	 * divide fclk by 1000000 to get the correct value. */
	val = (((-val) * (state->fclk/1000000)) / (1<<24));

	return val;
}

static void s5h1420_setfec_inversion(struct s5h1420_state* state,
				     struct dvb_frontend_parameters *p)
{
	u8 inversion = 0;

	if (p->inversion == INVERSION_OFF) {
		inversion = state->config->invert ? 0x08 : 0;
	} else if (p->inversion == INVERSION_ON) {
		inversion = state->config->invert ? 0 : 0x08;
	}

	if ((p->u.qpsk.fec_inner == FEC_AUTO) || (p->inversion == INVERSION_AUTO)) {
		s5h1420_writereg(state, 0x30, 0x3f);
		s5h1420_writereg(state, 0x31, 0x00 | inversion);
	} else {
		switch(p->u.qpsk.fec_inner) {
		case FEC_1_2:
			s5h1420_writereg(state, 0x30, 0x01);
			s5h1420_writereg(state, 0x31, 0x10 | inversion);
			break;

		case FEC_2_3:
			s5h1420_writereg(state, 0x30, 0x02);
			s5h1420_writereg(state, 0x31, 0x11 | inversion);
			break;

		case FEC_3_4:
			s5h1420_writereg(state, 0x30, 0x04);
		        s5h1420_writereg(state, 0x31, 0x12 | inversion);
		        break;

		case FEC_5_6:
			s5h1420_writereg(state, 0x30, 0x08);
			s5h1420_writereg(state, 0x31, 0x13 | inversion);
			break;

		case FEC_6_7:
			s5h1420_writereg(state, 0x30, 0x10);
			s5h1420_writereg(state, 0x31, 0x14 | inversion);
			break;

		case FEC_7_8:
			s5h1420_writereg(state, 0x30, 0x20);
			s5h1420_writereg(state, 0x31, 0x15 | inversion);
			break;

		default:
			return;
		}
	}
}

static fe_code_rate_t s5h1420_getfec(struct s5h1420_state* state)
{
	switch(s5h1420_readreg(state, 0x32) & 0x07) {
	case 0:
		return FEC_1_2;

	case 1:
		return FEC_2_3;

	case 2:
		return FEC_3_4;

	case 3:
		return FEC_5_6;

	case 4:
		return FEC_6_7;

	case 5:
		return FEC_7_8;
	}

	return FEC_NONE;
}

static fe_spectral_inversion_t s5h1420_getinversion(struct s5h1420_state* state)
{
	if (s5h1420_readreg(state, 0x32) & 0x08)
		return INVERSION_ON;

	return INVERSION_OFF;
}

static int s5h1420_set_frontend(struct dvb_frontend* fe,
				struct dvb_frontend_parameters *p)
{
	struct s5h1420_state* state = fe->demodulator_priv;
	int frequency_delta;
	struct dvb_frontend_tune_settings fesettings;
	u32 tmp;

	/* check if we should do a fast-tune */
	memcpy(&fesettings.parameters, p, sizeof(struct dvb_frontend_parameters));
	s5h1420_get_tune_settings(fe, &fesettings);
	frequency_delta = p->frequency - state->tunedfreq;
	if ((frequency_delta > -fesettings.max_drift) &&
	    (frequency_delta < fesettings.max_drift) &&
	    (frequency_delta != 0) &&
	    (state->fec_inner == p->u.qpsk.fec_inner) &&
	    (state->symbol_rate == p->u.qpsk.symbol_rate)) {

		if (state->config->pll_set) {
			s5h1420_writereg (state, 0x02, s5h1420_readreg(state,0x02) | 1);
			state->config->pll_set(fe, p, &tmp);
			s5h1420_setfreqoffset(state, p->frequency - tmp);
		}
		return 0;
	}

	/* first of all, software reset */
	s5h1420_reset(state);

	/* set s5h1420 fclk PLL according to desired symbol rate */
	if (p->u.qpsk.symbol_rate > 28000000) {
		state->fclk = 88000000;
		s5h1420_writereg(state, 0x03, 0x50);
		s5h1420_writereg(state, 0x04, 0x40);
		s5h1420_writereg(state, 0x05, 0xae);
	} else if (p->u.qpsk.symbol_rate > 21000000) {
		state->fclk = 59000000;
		s5h1420_writereg(state, 0x03, 0x33);
		s5h1420_writereg(state, 0x04, 0x40);
		s5h1420_writereg(state, 0x05, 0xae);
	} else {
		state->fclk = 88000000;
		s5h1420_writereg(state, 0x03, 0x50);
		s5h1420_writereg(state, 0x04, 0x40);
		s5h1420_writereg(state, 0x05, 0xac);
	}

	/* set misc registers */
	s5h1420_writereg(state, 0x02, 0x00);
	s5h1420_writereg(state, 0x06, 0x00);
	s5h1420_writereg(state, 0x07, 0xb0);
	s5h1420_writereg(state, 0x0a, 0xe7);
	s5h1420_writereg(state, 0x0b, 0x78);
	s5h1420_writereg(state, 0x0c, 0x48);
	s5h1420_writereg(state, 0x0d, 0x6b);
	s5h1420_writereg(state, 0x2e, 0x8e);
	s5h1420_writereg(state, 0x35, 0x33);
	s5h1420_writereg(state, 0x38, 0x01);
	s5h1420_writereg(state, 0x39, 0x7d);
	s5h1420_writereg(state, 0x3a, (state->fclk + (TONE_FREQ * 32) - 1) / (TONE_FREQ * 32));
	s5h1420_writereg(state, 0x3c, 0x00);
	s5h1420_writereg(state, 0x45, 0x61);
	s5h1420_writereg(state, 0x46, 0x1d);

	/* start QPSK */
	s5h1420_writereg(state, 0x05, s5h1420_readreg(state, 0x05) | 1);

	/* set tuner PLL */
	if (state->config->pll_set) {
		s5h1420_writereg (state, 0x02, s5h1420_readreg(state,0x02) | 1);
		state->config->pll_set(fe, p, &tmp);
		s5h1420_setfreqoffset(state, 0);
	}

	/* set the reset of the parameters */
	s5h1420_setsymbolrate(state, p);
	s5h1420_setfec_inversion(state, p);

	state->fec_inner = p->u.qpsk.fec_inner;
	state->symbol_rate = p->u.qpsk.symbol_rate;
	state->postlocked = 0;
	state->tunedfreq = p->frequency;
	return 0;
}

static int s5h1420_get_frontend(struct dvb_frontend* fe,
				struct dvb_frontend_parameters *p)
{
	struct s5h1420_state* state = fe->demodulator_priv;

	p->frequency = state->tunedfreq + s5h1420_getfreqoffset(state);
	p->inversion = s5h1420_getinversion(state);
	p->u.qpsk.symbol_rate = s5h1420_getsymbolrate(state);
	p->u.qpsk.fec_inner = s5h1420_getfec(state);

	return 0;
}

static int s5h1420_get_tune_settings(struct dvb_frontend* fe,
				     struct dvb_frontend_tune_settings* fesettings)
{
	if (fesettings->parameters.u.qpsk.symbol_rate > 20000000) {
		fesettings->min_delay_ms = 50;
		fesettings->step_size = 2000;
		fesettings->max_drift = 8000;
	} else if (fesettings->parameters.u.qpsk.symbol_rate > 12000000) {
		fesettings->min_delay_ms = 100;
		fesettings->step_size = 1500;
		fesettings->max_drift = 9000;
	} else if (fesettings->parameters.u.qpsk.symbol_rate > 8000000) {
		fesettings->min_delay_ms = 100;
		fesettings->step_size = 1000;
		fesettings->max_drift = 8000;
	} else if (fesettings->parameters.u.qpsk.symbol_rate > 4000000) {
		fesettings->min_delay_ms = 100;
		fesettings->step_size = 500;
		fesettings->max_drift = 7000;
	} else if (fesettings->parameters.u.qpsk.symbol_rate > 2000000) {
		fesettings->min_delay_ms = 200;
		fesettings->step_size = (fesettings->parameters.u.qpsk.symbol_rate / 8000);
		fesettings->max_drift = 14 * fesettings->step_size;
	} else {
		fesettings->min_delay_ms = 200;
		fesettings->step_size = (fesettings->parameters.u.qpsk.symbol_rate / 8000);
		fesettings->max_drift = 18 * fesettings->step_size;
	}

	return 0;
}

static int s5h1420_init (struct dvb_frontend* fe)
{
	struct s5h1420_state* state = fe->demodulator_priv;

	/* disable power down and do reset */
	s5h1420_writereg(state, 0x02, 0x10);
	msleep(10);
	s5h1420_reset(state);

	/* init PLL */
	if (state->config->pll_init) {
		s5h1420_writereg (state, 0x02, s5h1420_readreg(state,0x02) | 1);
		state->config->pll_init(fe);
		s5h1420_writereg (state, 0x02, s5h1420_readreg(state,0x02) & 0xfe);
	}

	return 0;
}

static int s5h1420_sleep(struct dvb_frontend* fe)
{
	struct s5h1420_state* state = fe->demodulator_priv;

	return s5h1420_writereg(state, 0x02, 0x12);
}

static void s5h1420_release(struct dvb_frontend* fe)
{
	struct s5h1420_state* state = fe->demodulator_priv;
	kfree(state);
}

static struct dvb_frontend_ops s5h1420_ops;

struct dvb_frontend* s5h1420_attach(const struct s5h1420_config* config,
				    struct i2c_adapter* i2c)
{
	struct s5h1420_state* state = NULL;
	u8 identity;

	/* allocate memory for the internal state */
	state = kmalloc(sizeof(struct s5h1420_state), GFP_KERNEL);
	if (state == NULL)
		goto error;

	/* setup the state */
	state->config = config;
	state->i2c = i2c;
	memcpy(&state->ops, &s5h1420_ops, sizeof(struct dvb_frontend_ops));
	state->postlocked = 0;
	state->fclk = 88000000;
	state->tunedfreq = 0;
	state->fec_inner = FEC_NONE;
	state->symbol_rate = 0;

	/* check if the demod is there + identify it */
	identity = s5h1420_readreg(state, 0x00);
	if (identity != 0x03)
		goto error;

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

error:
	kfree(state);
	return NULL;
}

static struct dvb_frontend_ops s5h1420_ops = {

	.info = {
		.name     = "Samsung S5H1420 DVB-S",
		.type     = FE_QPSK,
		.frequency_min    = 950000,
		.frequency_max    = 2150000,
		.frequency_stepsize = 125,     /* kHz for QPSK frontends */
		.frequency_tolerance  = 29500,
		.symbol_rate_min  = 1000000,
		.symbol_rate_max  = 45000000,
		/*  .symbol_rate_tolerance  = ???,*/
		.caps = FE_CAN_INVERSION_AUTO |
		FE_CAN_FEC_1_2 | FE_CAN_FEC_2_3 | FE_CAN_FEC_3_4 |
		FE_CAN_FEC_5_6 | FE_CAN_FEC_6_7 | FE_CAN_FEC_7_8 | FE_CAN_FEC_AUTO |
		FE_CAN_QPSK
	},

	.release = s5h1420_release,

	.init = s5h1420_init,
	.sleep = s5h1420_sleep,

	.set_frontend = s5h1420_set_frontend,
	.get_frontend = s5h1420_get_frontend,
	.get_tune_settings = s5h1420_get_tune_settings,

	.read_status = s5h1420_read_status,
	.read_ber = s5h1420_read_ber,
	.read_signal_strength = s5h1420_read_signal_strength,
	.read_ucblocks = s5h1420_read_ucblocks,

	.diseqc_send_master_cmd = s5h1420_send_master_cmd,
	.diseqc_recv_slave_reply = s5h1420_recv_slave_reply,
	.diseqc_send_burst = s5h1420_send_burst,
	.set_tone = s5h1420_set_tone,
	.set_voltage = s5h1420_set_voltage,
};

module_param(debug, int, 0644);

MODULE_DESCRIPTION("Samsung S5H1420 DVB-S Demodulator driver");
MODULE_AUTHOR("Andrew de Quincey");
MODULE_LICENSE("GPL");

EXPORT_SYMBOL(s5h1420_attach);