- 根目录:
- drivers
- media
- dvb
- frontends
- cxd2820r_c.c
/*
* Sony CXD2820R demodulator driver
*
* Copyright (C) 2010 Antti Palosaari <crope@iki.fi>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "cxd2820r_priv.h"
int cxd2820r_set_frontend_c(struct dvb_frontend *fe)
{
struct cxd2820r_priv *priv = fe->demodulator_priv;
struct dtv_frontend_properties *c = &fe->dtv_property_cache;
int ret, i;
u8 buf[2];
u32 if_freq;
u16 if_ctl;
u64 num;
struct reg_val_mask tab[] = {
{ 0x00080, 0x01, 0xff },
{ 0x00081, 0x05, 0xff },
{ 0x00085, 0x07, 0xff },
{ 0x00088, 0x01, 0xff },
{ 0x00082, 0x20, 0x60 },
{ 0x1016a, 0x48, 0xff },
{ 0x100a5, 0x00, 0x01 },
{ 0x10020, 0x06, 0x07 },
{ 0x10059, 0x50, 0xff },
{ 0x10087, 0x0c, 0x3c },
{ 0x1008b, 0x07, 0xff },
{ 0x1001f, priv->cfg.if_agc_polarity << 7, 0x80 },
{ 0x10070, priv->cfg.ts_mode, 0xff },
};
dbg("%s: RF=%d SR=%d", __func__, c->frequency, c->symbol_rate);
/* update GPIOs */
ret = cxd2820r_gpio(fe);
if (ret)
goto error;
/* program tuner */
if (fe->ops.tuner_ops.set_params)
fe->ops.tuner_ops.set_params(fe);
if (priv->delivery_system != SYS_DVBC_ANNEX_A) {
for (i = 0; i < ARRAY_SIZE(tab); i++) {
ret = cxd2820r_wr_reg_mask(priv, tab[i].reg,
tab[i].val, tab[i].mask);
if (ret)
goto error;
}
}
priv->delivery_system = SYS_DVBC_ANNEX_A;
priv->ber_running = 0; /* tune stops BER counter */
/* program IF frequency */
if (fe->ops.tuner_ops.get_if_frequency) {
ret = fe->ops.tuner_ops.get_if_frequency(fe, &if_freq);
if (ret)
goto error;
} else
if_freq = 0;
dbg("%s: if_freq=%d", __func__, if_freq);
num = if_freq / 1000; /* Hz => kHz */
num *= 0x4000;
if_ctl = cxd2820r_div_u64_round_closest(num, 41000);
buf[0] = (if_ctl >> 8) & 0x3f;
buf[1] = (if_ctl >> 0) & 0xff;
ret = cxd2820r_wr_regs(priv, 0x10042, buf, 2);
if (ret)
goto error;
ret = cxd2820r_wr_reg(priv, 0x000ff, 0x08);
if (ret)
goto error;
ret = cxd2820r_wr_reg(priv, 0x000fe, 0x01);
if (ret)
goto error;
return ret;
error:
dbg("%s: failed:%d", __func__, ret);
return ret;
}
int cxd2820r_get_frontend_c(struct dvb_frontend *fe)
{
struct cxd2820r_priv *priv = fe->demodulator_priv;
struct dtv_frontend_properties *c = &fe->dtv_property_cache;
int ret;
u8 buf[2];
ret = cxd2820r_rd_regs(priv, 0x1001a, buf, 2);
if (ret)
goto error;
c->symbol_rate = 2500 * ((buf[0] & 0x0f) << 8 | buf[1]);
ret = cxd2820r_rd_reg(priv, 0x10019, &buf[0]);
if (ret)
goto error;
switch ((buf[0] >> 0) & 0x03) {
case 0:
c->modulation = QAM_16;
break;
case 1:
c->modulation = QAM_32;
break;
case 2:
c->modulation = QAM_64;
break;
case 3:
c->modulation = QAM_128;
break;
case 4:
c->modulation = QAM_256;
break;
}
switch ((buf[0] >> 7) & 0x01) {
case 0:
c->inversion = INVERSION_OFF;
break;
case 1:
c->inversion = INVERSION_ON;
break;
}
return ret;
error:
dbg("%s: failed:%d", __func__, ret);
return ret;
}
int cxd2820r_read_ber_c(struct dvb_frontend *fe, u32 *ber)
{
struct cxd2820r_priv *priv = fe->demodulator_priv;
int ret;
u8 buf[3], start_ber = 0;
*ber = 0;
if (priv->ber_running) {
ret = cxd2820r_rd_regs(priv, 0x10076, buf, sizeof(buf));
if (ret)
goto error;
if ((buf[2] >> 7) & 0x01 || (buf[2] >> 4) & 0x01) {
*ber = (buf[2] & 0x0f) << 16 | buf[1] << 8 | buf[0];
start_ber = 1;
}
} else {
priv->ber_running = 1;
start_ber = 1;
}
if (start_ber) {
/* (re)start BER */
ret = cxd2820r_wr_reg(priv, 0x10079, 0x01);
if (ret)
goto error;
}
return ret;
error:
dbg("%s: failed:%d", __func__, ret);
return ret;
}
int cxd2820r_read_signal_strength_c(struct dvb_frontend *fe,
u16 *strength)
{
struct cxd2820r_priv *priv = fe->demodulator_priv;
int ret;
u8 buf[2];
u16 tmp;
ret = cxd2820r_rd_regs(priv, 0x10049, buf, sizeof(buf));
if (ret)
goto error;
tmp = (buf[0] & 0x03) << 8 | buf[1];
tmp = (~tmp & 0x03ff);
if (tmp == 512)
/* ~no signal */
tmp = 0;
else if (tmp > 350)
tmp = 350;
/* scale value to 0x0000-0xffff */
*strength = tmp * 0xffff / (350-0);
return ret;
error:
dbg("%s: failed:%d", __func__, ret);
return ret;
}
int cxd2820r_read_snr_c(struct dvb_frontend *fe, u16 *snr)
{
struct cxd2820r_priv *priv = fe->demodulator_priv;
int ret;
u8 tmp;
unsigned int A, B;
/* report SNR in dB * 10 */
ret = cxd2820r_rd_reg(priv, 0x10019, &tmp);
if (ret)
goto error;
if (((tmp >> 0) & 0x03) % 2) {
A = 875;
B = 650;
} else {
A = 950;
B = 760;
}
ret = cxd2820r_rd_reg(priv, 0x1004d, &tmp);
if (ret)
goto error;
#define CXD2820R_LOG2_E_24 24204406 /* log2(e) << 24 */
if (tmp)
*snr = A * (intlog2(B / tmp) >> 5) / (CXD2820R_LOG2_E_24 >> 5)
/ 10;
else
*snr = 0;
return ret;
error:
dbg("%s: failed:%d", __func__, ret);
return ret;
}
int cxd2820r_read_ucblocks_c(struct dvb_frontend *fe, u32 *ucblocks)
{
*ucblocks = 0;
/* no way to read ? */
return 0;
}
int cxd2820r_read_status_c(struct dvb_frontend *fe, fe_status_t *status)
{
struct cxd2820r_priv *priv = fe->demodulator_priv;
int ret;
u8 buf[2];
*status = 0;
ret = cxd2820r_rd_regs(priv, 0x10088, buf, sizeof(buf));
if (ret)
goto error;
if (((buf[0] >> 0) & 0x01) == 1) {
*status |= FE_HAS_SIGNAL | FE_HAS_CARRIER |
FE_HAS_VITERBI | FE_HAS_SYNC;
if (((buf[1] >> 3) & 0x01) == 1) {
*status |= FE_HAS_SIGNAL | FE_HAS_CARRIER |
FE_HAS_VITERBI | FE_HAS_SYNC | FE_HAS_LOCK;
}
}
dbg("%s: lock=%02x %02x", __func__, buf[0], buf[1]);
return ret;
error:
dbg("%s: failed:%d", __func__, ret);
return ret;
}
int cxd2820r_init_c(struct dvb_frontend *fe)
{
struct cxd2820r_priv *priv = fe->demodulator_priv;
int ret;
ret = cxd2820r_wr_reg(priv, 0x00085, 0x07);
if (ret)
goto error;
return ret;
error:
dbg("%s: failed:%d", __func__, ret);
return ret;
}
int cxd2820r_sleep_c(struct dvb_frontend *fe)
{
struct cxd2820r_priv *priv = fe->demodulator_priv;
int ret, i;
struct reg_val_mask tab[] = {
{ 0x000ff, 0x1f, 0xff },
{ 0x00085, 0x00, 0xff },
{ 0x00088, 0x01, 0xff },
{ 0x00081, 0x00, 0xff },
{ 0x00080, 0x00, 0xff },
};
dbg("%s", __func__);
priv->delivery_system = SYS_UNDEFINED;
for (i = 0; i < ARRAY_SIZE(tab); i++) {
ret = cxd2820r_wr_reg_mask(priv, tab[i].reg, tab[i].val,
tab[i].mask);
if (ret)
goto error;
}
return ret;
error:
dbg("%s: failed:%d", __func__, ret);
return ret;
}
int cxd2820r_get_tune_settings_c(struct dvb_frontend *fe,
struct dvb_frontend_tune_settings *s)
{
s->min_delay_ms = 500;
s->step_size = 0; /* no zigzag */
s->max_drift = 0;
return 0;
}