/* Set the soft decision threshold */ if (fec == FEC_1_2)
cx24123_writereg(state, 0x43,
cx24123_readreg(state, 0x43) | 0x01); else
cx24123_writereg(state, 0x43,
cx24123_readreg(state, 0x43) & ~0x01);
switch (fec) { case FEC_1_2:
dprintk("set FEC to 1/2\n");
cx24123_writereg(state, 0x0e, nom_reg | 0x01);
cx24123_writereg(state, 0x0f, 0x02); break; case FEC_2_3:
dprintk("set FEC to 2/3\n");
cx24123_writereg(state, 0x0e, nom_reg | 0x02);
cx24123_writereg(state, 0x0f, 0x04); break; case FEC_3_4:
dprintk("set FEC to 3/4\n");
cx24123_writereg(state, 0x0e, nom_reg | 0x03);
cx24123_writereg(state, 0x0f, 0x08); break; case FEC_4_5:
dprintk("set FEC to 4/5\n");
cx24123_writereg(state, 0x0e, nom_reg | 0x04);
cx24123_writereg(state, 0x0f, 0x10); break; case FEC_5_6:
dprintk("set FEC to 5/6\n");
cx24123_writereg(state, 0x0e, nom_reg | 0x05);
cx24123_writereg(state, 0x0f, 0x20); break; case FEC_6_7:
dprintk("set FEC to 6/7\n");
cx24123_writereg(state, 0x0e, nom_reg | 0x06);
cx24123_writereg(state, 0x0f, 0x40);
break;
case FEC_7_8:
dprintk("set FEC to 7/8\n");
cx24123_writereg(state, 0x0e, nom_reg | 0x07);
cx24123_writereg(state, 0x0f, 0x80);
break;
case FEC_AUTO:
dprintk("set FEC to auto\n");
cx24123_writereg(state, 0x0f, 0xfe);
break;
default:
return -EOPNOTSUPP;
}
return 0;
}
static int cx24123_get_fec(struct cx24123_state *state, enum fe_code_rate *fec)
{
int ret;
ret = cx24123_readreg(state, 0x1b);
if (ret < 0)
return ret;
ret = ret & 0x07;
switch (ret) {
case 1:
*fec = FEC_1_2;
break;
case 2:
*fec = FEC_2_3;
break;
case 3:
*fec = FEC_3_4;
break;
case 4:
*fec = FEC_4_5;
break;
case 5:
*fec = FEC_5_6;
break;
case 6:
*fec = FEC_6_7;
break;
case 7:
*fec = FEC_7_8;
break;
default:
/* this can happen when there's no lock */
*fec = FEC_NONE;
}
return 0;
}
/* Approximation of closest integer of log2(a/b). It actually gives the
lowest integer i such that 2^i >= round(a/b) */
static u32 cx24123_int_log2(u32 a, u32 b)
{
u32 exp, nearest = 0;
u32 div = a / b;
if (a % b >= b / 2)
++div;
if (div < (1UL << 31)) {
for (exp = 1; div > exp; nearest++)
exp += exp;
}
return nearest;
}
/* check if symbol rate is within limits */
if ((srate > state->frontend.ops.info.symbol_rate_max) ||
(srate < state->frontend.ops.info.symbol_rate_min))
return -EOPNOTSUPP;
/* choose the sampling rate high enough for the required operation,
while optimizing the power consumed by the demodulator */
if (srate < (XTAL*2)/2)
pll_mult = 2;
else if (srate < (XTAL*3)/2)
pll_mult = 3;
else if (srate < (XTAL*4)/2)
pll_mult = 4;
else if (srate < (XTAL*5)/2)
pll_mult = 5;
else if (srate < (XTAL*6)/2)
pll_mult = 6;
else if (srate < (XTAL*7)/2)
pll_mult = 7;
else if (srate < (XTAL*8)/2)
pll_mult = 8;
else
pll_mult = 9;
/*
* Based on the required frequency and symbolrate, the tuner AGC has
* to be configured and the correct band selected.
* Calculate those values.
*/
static int cx24123_pll_calculate(struct dvb_frontend *fe)
{
struct dtv_frontend_properties *p = &fe->dtv_property_cache;
struct cx24123_state *state = fe->demodulator_priv;
u32 ndiv = 0, adiv = 0, vco_div = 0;
int i = 0;
int pump = 2;
int band = 0;
int num_bands = ARRAY_SIZE(cx24123_bandselect_vals);
struct cx24123_bandselect_val *bsv = NULL;
struct cx24123_AGC_val *agcv = NULL;
/* For the given symbol rate, determine the VCA, VGA and
* FILTUNE programming bits */
for (i = 0; i < ARRAY_SIZE(cx24123_AGC_vals); i++) {
agcv = &cx24123_AGC_vals[i];
if ((agcv->symbolrate_low <= p->symbol_rate) &&
(agcv->symbolrate_high >= p->symbol_rate)) {
state->VCAarg = agcv->VCAprogdata;
state->VGAarg = agcv->VGAprogdata;
state->FILTune = agcv->FILTune;
}
}
/* determine the band to use */
if (force_band < 1 || force_band > num_bands) {
for (i = 0; i < num_bands; i++) {
bsv = &cx24123_bandselect_vals[i];
if ((bsv->freq_low <= p->frequency) &&
(bsv->freq_high >= p->frequency))
band = i;
}
} else
band = force_band - 1;
/*
* Tuner data is 21 bits long, must be left-aligned in data.
* Tuner cx24109 is written through a dedicated 3wire interface
* on the demod chip.
*/
static int cx24123_pll_writereg(struct dvb_frontend *fe, u32 data)
{
struct cx24123_state *state = fe->demodulator_priv;
unsigned long timeout;
/* align the 21 bytes into to bit23 boundary */
data = data << 3;
/* Reset the demod pll word length to 0x15 bits */
cx24123_writereg(state, 0x21, 0x15);
/* write the msb 8 bits, wait for the send to be completed */
timeout = jiffies + msecs_to_jiffies(40);
cx24123_writereg(state, 0x22, (data >> 16) & 0xff);
while ((cx24123_readreg(state, 0x20) & 0x40) == 0) {
if (time_after(jiffies, timeout)) {
err("%s: demodulator is not responding, "\
"possibly hung, aborting.\n", __func__);
return -EREMOTEIO;
}
msleep(10);
}
/* send another 8 bytes, wait for the send to be completed */
timeout = jiffies + msecs_to_jiffies(40);
cx24123_writereg(state, 0x22, (data >> 8) & 0xff);
while ((cx24123_readreg(state, 0x20) & 0x40) == 0) {
if (time_after(jiffies, timeout)) {
err("%s: demodulator is not responding, "\
"possibly hung, aborting.\n", __func__);
return -EREMOTEIO;
}
msleep(10);
}
/* send the lower 5 bits of this byte, padded with 3 LBB,
* wait for the send to be completed */
timeout = jiffies + msecs_to_jiffies(40);
cx24123_writereg(state, 0x22, (data) & 0xff);
while ((cx24123_readreg(state, 0x20) & 0x80)) {
if (time_after(jiffies, timeout)) {
err("%s: demodulator is not responding," \
"possibly hung, aborting.\n", __func__);
return -EREMOTEIO;
}
msleep(10);
}
/* Trigger the demod to configure the tuner */
cx24123_writereg(state, 0x20, cx24123_readreg(state, 0x20) | 2);
cx24123_writereg(state, 0x20, cx24123_readreg(state, 0x20) & 0xfd);
/* Write the new VCO/VGA */
cx24123_pll_writereg(fe, state->VCAarg);
cx24123_pll_writereg(fe, state->VGAarg);
/* Write the new bandselect and pll args */
cx24123_pll_writereg(fe, state->bandselectarg);
cx24123_pll_writereg(fe, state->pllarg);
/* set the FILTUNE voltage */
val = cx24123_readreg(state, 0x28) & ~0x3;
cx24123_writereg(state, 0x27, state->FILTune >> 2);
cx24123_writereg(state, 0x28, val | (state->FILTune & 0x3));
static int cx24123_initfe(struct dvb_frontend *fe)
{
struct cx24123_state *state = fe->demodulator_priv;
int i;
dprintk("init frontend\n");
/* Configure the demod to a good set of defaults */
for (i = 0; i < ARRAY_SIZE(cx24123_regdata); i++)
cx24123_writereg(state, cx24123_regdata[i].reg,
cx24123_regdata[i].data);
/* Set the LNB polarity */
if (state->config->lnb_polarity)
cx24123_writereg(state, 0x32,
cx24123_readreg(state, 0x32) | 0x02);
if (state->config->dont_use_pll)
cx24123_repeater_mode(state, 1, 0);
switch (voltage) {
case SEC_VOLTAGE_13:
dprintk("setting voltage 13V\n");
return cx24123_writereg(state, 0x29, val & 0x7f);
case SEC_VOLTAGE_18:
dprintk("setting voltage 18V\n");
return cx24123_writereg(state, 0x29, val | 0x80);
case SEC_VOLTAGE_OFF:
/* already handled in cx88-dvb */
return 0;
default:
return -EINVAL;
}
return 0;
}
/* wait for diseqc queue to become ready (or timeout) */
static void cx24123_wait_for_diseqc(struct cx24123_state *state)
{
unsigned long timeout = jiffies + msecs_to_jiffies(200);
while (!(cx24123_readreg(state, 0x29) & 0x40)) {
if (time_after(jiffies, timeout)) {
err("%s: diseqc queue not ready, " \
"command may be lost.\n", __func__);
break;
}
msleep(10);
}
}
static int cx24123_send_diseqc_msg(struct dvb_frontend *fe,
struct dvb_diseqc_master_cmd *cmd)
{
struct cx24123_state *state = fe->demodulator_priv;
int i, val, tone;
dprintk("\n");
/* stop continuous tone if enabled */
tone = cx24123_readreg(state, 0x29);
if (tone & 0x10)
cx24123_writereg(state, 0x29, tone & ~0x50);
/* wait for diseqc queue ready */
cx24123_wait_for_diseqc(state);
/* restart continuous tone if enabled */
if (tone & 0x10)
cx24123_writereg(state, 0x29, tone & ~0x40);
return 0;
}
static int cx24123_read_status(struct dvb_frontend *fe, enum fe_status *status)
{
struct cx24123_state *state = fe->demodulator_priv;
int sync = cx24123_readreg(state, 0x14);
*status = 0;
if (state->config->dont_use_pll) {
u32 tun_status = 0;
if (fe->ops.tuner_ops.get_status)
fe->ops.tuner_ops.get_status(fe, &tun_status);
if (tun_status & TUNER_STATUS_LOCKED)
*status |= FE_HAS_SIGNAL;
} else {
int lock = cx24123_readreg(state, 0x20);
if (lock & 0x01)
*status |= FE_HAS_SIGNAL;
}
if (sync & 0x02)
*status |= FE_HAS_CARRIER; /* Phase locked */
if (sync & 0x04)
*status |= FE_HAS_VITERBI;
/* Reed-Solomon Status */
if (sync & 0x08)
*status |= FE_HAS_SYNC;
if (sync & 0x80)
*status |= FE_HAS_LOCK; /*Full Sync */
return 0;
}
/*
* Configured to return the measurement of errors in blocks,
* because no UCBLOCKS value is available, so this value doubles up
* to satisfy both measurements.
*/
static int cx24123_read_ber(struct dvb_frontend *fe, u32 *ber)
{
struct cx24123_state *state = fe->demodulator_priv;
/* The true bit error rate is this value divided by
the window size (set as 256 * 255) */
*ber = ((cx24123_readreg(state, 0x1c) & 0x3f) << 16) |
(cx24123_readreg(state, 0x1d) << 8 |
cx24123_readreg(state, 0x1e));
/* Inverted raw Es/N0 count, totally bogus but better than the
BER threshold. */
*snr = 65535 - (((u16)cx24123_readreg(state, 0x18) << 8) |
(u16)cx24123_readreg(state, 0x19));
if (!state->config->dont_use_pll)
cx24123_pll_tune(fe);
else if (fe->ops.tuner_ops.set_params)
fe->ops.tuner_ops.set_params(fe);
else
err("it seems I don't have a tuner...");
/* wait for diseqc queue ready */
cx24123_wait_for_diseqc(state);
val = cx24123_readreg(state, 0x29) & ~0x40;
switch (tone) {
case SEC_TONE_ON:
dprintk("setting tone on\n");
return cx24123_writereg(state, 0x29, val | 0x10);
case SEC_TONE_OFF:
dprintk("setting tone off\n");
return cx24123_writereg(state, 0x29, val & 0xef);
default:
err("CASE reached default with tone=%d\n", tone);
return -EINVAL;
}
return 0;
}
static int cx24123_tune(struct dvb_frontend *fe,
bool re_tune,
unsigned int mode_flags,
unsigned int *delay,
enum fe_status *status)
{
int retval = 0;
if (re_tune)
retval = cx24123_set_frontend(fe);
if (!(mode_flags & FE_TUNE_MODE_ONESHOT))
cx24123_read_status(fe, status);
*delay = HZ/10;
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