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linux-pinenote/drivers/media/dvb/frontends/hd29l2.c
Antti Palosaari dab734ec95 [media] hd29l2: fix review findings 
Fix some issues pointed out by Mauro.
Mauro Carvalho Chehab <mchehab@redhat.com>

Signed-off-by: Antti Palosaari <crope@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
2012-01-10 22:58:55 -02:00

861 lines
18 KiB
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/*
* HDIC HD29L2 DMB-TH demodulator driver
*
* Copyright (C) 2011 Metropolia University of Applied Sciences, Electria R&D
*
* Author: 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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "hd29l2_priv.h"
int hd29l2_debug;
module_param_named(debug, hd29l2_debug, int, 0644);
MODULE_PARM_DESC(debug, "Turn on/off frontend debugging (default:off).");
/* write multiple registers */
static int hd29l2_wr_regs(struct hd29l2_priv *priv, u8 reg, u8 *val, int len)
{
int ret;
u8 buf[2 + len];
struct i2c_msg msg[1] = {
{
.addr = priv->cfg.i2c_addr,
.flags = 0,
.len = sizeof(buf),
.buf = buf,
}
};
buf[0] = 0x00;
buf[1] = reg;
memcpy(&buf[2], val, len);
ret = i2c_transfer(priv->i2c, msg, 1);
if (ret == 1) {
ret = 0;
} else {
warn("i2c wr failed=%d reg=%02x len=%d", ret, reg, len);
ret = -EREMOTEIO;
}
return ret;
}
/* read multiple registers */
static int hd29l2_rd_regs(struct hd29l2_priv *priv, u8 reg, u8 *val, int len)
{
int ret;
u8 buf[2] = { 0x00, reg };
struct i2c_msg msg[2] = {
{
.addr = priv->cfg.i2c_addr,
.flags = 0,
.len = 2,
.buf = buf,
}, {
.addr = priv->cfg.i2c_addr,
.flags = I2C_M_RD,
.len = len,
.buf = val,
}
};
ret = i2c_transfer(priv->i2c, msg, 2);
if (ret == 2) {
ret = 0;
} else {
warn("i2c rd failed=%d reg=%02x len=%d", ret, reg, len);
ret = -EREMOTEIO;
}
return ret;
}
/* write single register */
static int hd29l2_wr_reg(struct hd29l2_priv *priv, u8 reg, u8 val)
{
return hd29l2_wr_regs(priv, reg, &val, 1);
}
/* read single register */
static int hd29l2_rd_reg(struct hd29l2_priv *priv, u8 reg, u8 *val)
{
return hd29l2_rd_regs(priv, reg, val, 1);
}
/* write single register with mask */
static int hd29l2_wr_reg_mask(struct hd29l2_priv *priv, u8 reg, u8 val, u8 mask)
{
int ret;
u8 tmp;
/* no need for read if whole reg is written */
if (mask != 0xff) {
ret = hd29l2_rd_regs(priv, reg, &tmp, 1);
if (ret)
return ret;
val &= mask;
tmp &= ~mask;
val |= tmp;
}
return hd29l2_wr_regs(priv, reg, &val, 1);
}
/* read single register with mask */
int hd29l2_rd_reg_mask(struct hd29l2_priv *priv, u8 reg, u8 *val, u8 mask)
{
int ret, i;
u8 tmp;
ret = hd29l2_rd_regs(priv, reg, &tmp, 1);
if (ret)
return ret;
tmp &= mask;
/* find position of the first bit */
for (i = 0; i < 8; i++) {
if ((mask >> i) & 0x01)
break;
}
*val = tmp >> i;
return 0;
}
static int hd29l2_soft_reset(struct hd29l2_priv *priv)
{
int ret;
u8 tmp;
ret = hd29l2_rd_reg(priv, 0x26, &tmp);
if (ret)
goto err;
ret = hd29l2_wr_reg(priv, 0x26, 0x0d);
if (ret)
goto err;
usleep_range(10000, 20000);
ret = hd29l2_wr_reg(priv, 0x26, tmp);
if (ret)
goto err;
return 0;
err:
dbg("%s: failed=%d", __func__, ret);
return ret;
}
static int hd29l2_i2c_gate_ctrl(struct dvb_frontend *fe, int enable)
{
int ret, i;
struct hd29l2_priv *priv = fe->demodulator_priv;
u8 tmp;
dbg("%s: enable=%d", __func__, enable);
/* set tuner address for demod */
if (!priv->tuner_i2c_addr_programmed && enable) {
/* no need to set tuner address every time, once is enough */
ret = hd29l2_wr_reg(priv, 0x9d, priv->cfg.tuner_i2c_addr << 1);
if (ret)
goto err;
priv->tuner_i2c_addr_programmed = true;
}
/* open / close gate */
ret = hd29l2_wr_reg(priv, 0x9f, enable);
if (ret)
goto err;
/* wait demod ready */
for (i = 10; i; i--) {
ret = hd29l2_rd_reg(priv, 0x9e, &tmp);
if (ret)
goto err;
if (tmp == enable)
break;
usleep_range(5000, 10000);
}
dbg("%s: loop=%d", __func__, i);
return ret;
err:
dbg("%s: failed=%d", __func__, ret);
return ret;
}
static int hd29l2_read_status(struct dvb_frontend *fe, fe_status_t *status)
{
int ret;
struct hd29l2_priv *priv = fe->demodulator_priv;
u8 buf[2];
*status = 0;
ret = hd29l2_rd_reg(priv, 0x05, &buf[0]);
if (ret)
goto err;
if (buf[0] & 0x01) {
/* full lock */
*status |= FE_HAS_SIGNAL | FE_HAS_CARRIER | FE_HAS_VITERBI |
FE_HAS_SYNC | FE_HAS_LOCK;
} else {
ret = hd29l2_rd_reg(priv, 0x0d, &buf[1]);
if (ret)
goto err;
if ((buf[1] & 0xfe) == 0x78)
/* partial lock */
*status |= FE_HAS_SIGNAL | FE_HAS_CARRIER |
FE_HAS_VITERBI | FE_HAS_SYNC;
}
priv->fe_status = *status;
return 0;
err:
dbg("%s: failed=%d", __func__, ret);
return ret;
}
static int hd29l2_read_snr(struct dvb_frontend *fe, u16 *snr)
{
int ret;
struct hd29l2_priv *priv = fe->demodulator_priv;
u8 buf[2];
u16 tmp;
if (!(priv->fe_status & FE_HAS_LOCK)) {
*snr = 0;
ret = 0;
goto err;
}
ret = hd29l2_rd_regs(priv, 0x0b, buf, 2);
if (ret)
goto err;
tmp = (buf[0] << 8) | buf[1];
/* report SNR in dB * 10 */
#define LOG10_20736_24 72422627 /* log10(20736) << 24 */
if (tmp)
*snr = (LOG10_20736_24 - intlog10(tmp)) / ((1 << 24) / 100);
else
*snr = 0;
return 0;
err:
dbg("%s: failed=%d", __func__, ret);
return ret;
}
static int hd29l2_read_signal_strength(struct dvb_frontend *fe, u16 *strength)
{
int ret;
struct hd29l2_priv *priv = fe->demodulator_priv;
u8 buf[2];
u16 tmp;
*strength = 0;
ret = hd29l2_rd_regs(priv, 0xd5, buf, 2);
if (ret)
goto err;
tmp = buf[0] << 8 | buf[1];
tmp = ~tmp & 0x0fff;
/* scale value to 0x0000-0xffff from 0x0000-0x0fff */
*strength = tmp * 0xffff / 0x0fff;
return 0;
err:
dbg("%s: failed=%d", __func__, ret);
return ret;
}
static int hd29l2_read_ber(struct dvb_frontend *fe, u32 *ber)
{
int ret;
struct hd29l2_priv *priv = fe->demodulator_priv;
u8 buf[2];
if (!(priv->fe_status & FE_HAS_SYNC)) {
*ber = 0;
ret = 0;
goto err;
}
ret = hd29l2_rd_regs(priv, 0xd9, buf, 2);
if (ret) {
*ber = 0;
goto err;
}
/* LDPC BER */
*ber = ((buf[0] & 0x0f) << 8) | buf[1];
return 0;
err:
dbg("%s: failed=%d", __func__, ret);
return ret;
}
static int hd29l2_read_ucblocks(struct dvb_frontend *fe, u32 *ucblocks)
{
/* no way to read? */
*ucblocks = 0;
return 0;
}
static enum dvbfe_search hd29l2_search(struct dvb_frontend *fe)
{
int ret, i;
struct hd29l2_priv *priv = fe->demodulator_priv;
struct dtv_frontend_properties *c = &fe->dtv_property_cache;
u8 tmp, buf[3];
u8 modulation, carrier, guard_interval, interleave, code_rate;
u64 num64;
u32 if_freq, if_ctl;
bool auto_mode;
dbg("%s: delivery_system=%d frequency=%d bandwidth_hz=%d " \
"modulation=%d inversion=%d fec_inner=%d guard_interval=%d",
__func__,
c->delivery_system, c->frequency, c->bandwidth_hz,
c->modulation, c->inversion, c->fec_inner, c->guard_interval);
/* as for now we detect always params automatically */
auto_mode = true;
/* program tuner */
if (fe->ops.tuner_ops.set_params)
fe->ops.tuner_ops.set_params(fe);
/* get and program IF */
if (fe->ops.tuner_ops.get_if_frequency)
fe->ops.tuner_ops.get_if_frequency(fe, &if_freq);
else
if_freq = 0;
if (if_freq) {
/* normal IF */
/* calc IF control value */
num64 = if_freq;
num64 *= 0x800000;
num64 = div_u64(num64, HD29L2_XTAL);
num64 -= 0x800000;
if_ctl = num64;
tmp = 0xfc; /* tuner type normal */
} else {
/* zero IF */
if_ctl = 0;
tmp = 0xfe; /* tuner type Zero-IF */
}
buf[0] = ((if_ctl >> 0) & 0xff);
buf[1] = ((if_ctl >> 8) & 0xff);
buf[2] = ((if_ctl >> 16) & 0xff);
/* program IF control */
ret = hd29l2_wr_regs(priv, 0x14, buf, 3);
if (ret)
goto err;
/* program tuner type */
ret = hd29l2_wr_reg(priv, 0xab, tmp);
if (ret)
goto err;
dbg("%s: if_freq=%d if_ctl=%x", __func__, if_freq, if_ctl);
if (auto_mode) {
/*
* use auto mode
*/
/* disable quick mode */
ret = hd29l2_wr_reg_mask(priv, 0xac, 0 << 7, 0x80);
if (ret)
goto err;
ret = hd29l2_wr_reg_mask(priv, 0x82, 1 << 1, 0x02);
if (ret)
goto err;
/* enable auto mode */
ret = hd29l2_wr_reg_mask(priv, 0x7d, 1 << 6, 0x40);
if (ret)
goto err;
ret = hd29l2_wr_reg_mask(priv, 0x81, 1 << 3, 0x08);
if (ret)
goto err;
/* soft reset */
ret = hd29l2_soft_reset(priv);
if (ret)
goto err;
/* detect modulation */
for (i = 30; i; i--) {
msleep(100);
ret = hd29l2_rd_reg(priv, 0x0d, &tmp);
if (ret)
goto err;
if ((((tmp & 0xf0) >= 0x10) &&
((tmp & 0x0f) == 0x08)) || (tmp >= 0x2c))
break;
}
dbg("%s: loop=%d", __func__, i);
if (i == 0)
/* detection failed */
return DVBFE_ALGO_SEARCH_FAILED;
/* read modulation */
ret = hd29l2_rd_reg_mask(priv, 0x7d, &modulation, 0x07);
if (ret)
goto err;
} else {
/*
* use manual mode
*/
modulation = HD29L2_QAM64;
carrier = HD29L2_CARRIER_MULTI;
guard_interval = HD29L2_PN945;
interleave = HD29L2_INTERLEAVER_420;
code_rate = HD29L2_CODE_RATE_08;
tmp = (code_rate << 3) | modulation;
ret = hd29l2_wr_reg_mask(priv, 0x7d, tmp, 0x5f);
if (ret)
goto err;
tmp = (carrier << 2) | guard_interval;
ret = hd29l2_wr_reg_mask(priv, 0x81, tmp, 0x0f);
if (ret)
goto err;
tmp = interleave;
ret = hd29l2_wr_reg_mask(priv, 0x82, tmp, 0x03);
if (ret)
goto err;
}
/* ensure modulation validy */
/* 0=QAM4_NR, 1=QAM4, 2=QAM16, 3=QAM32, 4=QAM64 */
if (modulation > (ARRAY_SIZE(reg_mod_vals_tab[0].val) - 1)) {
dbg("%s: modulation=%d not valid", __func__, modulation);
goto err;
}
/* program registers according to modulation */
for (i = 0; i < ARRAY_SIZE(reg_mod_vals_tab); i++) {
ret = hd29l2_wr_reg(priv, reg_mod_vals_tab[i].reg,
reg_mod_vals_tab[i].val[modulation]);
if (ret)
goto err;
}
/* read guard interval */
ret = hd29l2_rd_reg_mask(priv, 0x81, &guard_interval, 0x03);
if (ret)
goto err;
/* read carrier mode */
ret = hd29l2_rd_reg_mask(priv, 0x81, &carrier, 0x04);
if (ret)
goto err;
dbg("%s: modulation=%d guard_interval=%d carrier=%d",
__func__, modulation, guard_interval, carrier);
if ((carrier == HD29L2_CARRIER_MULTI) && (modulation == HD29L2_QAM64) &&
(guard_interval == HD29L2_PN945)) {
dbg("%s: C=3780 && QAM64 && PN945", __func__);
ret = hd29l2_wr_reg(priv, 0x42, 0x33);
if (ret)
goto err;
ret = hd29l2_wr_reg(priv, 0xdd, 0x01);
if (ret)
goto err;
}
usleep_range(10000, 20000);
/* soft reset */
ret = hd29l2_soft_reset(priv);
if (ret)
goto err;
/* wait demod lock */
for (i = 30; i; i--) {
msleep(100);
/* read lock bit */
ret = hd29l2_rd_reg_mask(priv, 0x05, &tmp, 0x01);
if (ret)
goto err;
if (tmp)
break;
}
dbg("%s: loop=%d", __func__, i);
if (i == 0)
return DVBFE_ALGO_SEARCH_AGAIN;
return DVBFE_ALGO_SEARCH_SUCCESS;
err:
dbg("%s: failed=%d", __func__, ret);
return DVBFE_ALGO_SEARCH_ERROR;
}
static int hd29l2_get_frontend_algo(struct dvb_frontend *fe)
{
return DVBFE_ALGO_CUSTOM;
}
static int hd29l2_get_frontend(struct dvb_frontend *fe)
{
int ret;
struct hd29l2_priv *priv = fe->demodulator_priv;
struct dtv_frontend_properties *c = &fe->dtv_property_cache;
u8 buf[3];
u32 if_ctl;
char *str_constellation, *str_code_rate, *str_constellation_code_rate,
*str_guard_interval, *str_carrier, *str_guard_interval_carrier,
*str_interleave, *str_interleave_;
ret = hd29l2_rd_reg(priv, 0x7d, &buf[0]);
if (ret)
goto err;
ret = hd29l2_rd_regs(priv, 0x81, &buf[1], 2);
if (ret)
goto err;
/* constellation, 0x7d[2:0] */
switch ((buf[0] >> 0) & 0x07) {
case 0: /* QAM4NR */
str_constellation = "QAM4NR";
c->modulation = QAM_AUTO; /* FIXME */
break;
case 1: /* QAM4 */
str_constellation = "QAM4";
c->modulation = QPSK; /* FIXME */
break;
case 2:
str_constellation = "QAM16";
c->modulation = QAM_16;
break;
case 3:
str_constellation = "QAM32";
c->modulation = QAM_32;
break;
case 4:
str_constellation = "QAM64";
c->modulation = QAM_64;
break;
default:
str_constellation = "?";
}
/* LDPC code rate, 0x7d[4:3] */
switch ((buf[0] >> 3) & 0x03) {
case 0: /* 0.4 */
str_code_rate = "0.4";
c->fec_inner = FEC_AUTO; /* FIXME */
break;
case 1: /* 0.6 */
str_code_rate = "0.6";
c->fec_inner = FEC_3_5;
break;
case 2: /* 0.8 */
str_code_rate = "0.8";
c->fec_inner = FEC_4_5;
break;
default:
str_code_rate = "?";
}
/* constellation & code rate set, 0x7d[6] */
switch ((buf[0] >> 6) & 0x01) {
case 0:
str_constellation_code_rate = "manual";
break;
case 1:
str_constellation_code_rate = "auto";
break;
default:
str_constellation_code_rate = "?";
}
/* frame header, 0x81[1:0] */
switch ((buf[1] >> 0) & 0x03) {
case 0: /* PN945 */
str_guard_interval = "PN945";
c->guard_interval = GUARD_INTERVAL_AUTO; /* FIXME */
break;
case 1: /* PN595 */
str_guard_interval = "PN595";
c->guard_interval = GUARD_INTERVAL_AUTO; /* FIXME */
break;
case 2: /* PN420 */
str_guard_interval = "PN420";
c->guard_interval = GUARD_INTERVAL_AUTO; /* FIXME */
break;
default:
str_guard_interval = "?";
}
/* carrier, 0x81[2] */
switch ((buf[1] >> 2) & 0x01) {
case 0:
str_carrier = "C=1";
break;
case 1:
str_carrier = "C=3780";
break;
default:
str_carrier = "?";
}
/* frame header & carrier set, 0x81[3] */
switch ((buf[1] >> 3) & 0x01) {
case 0:
str_guard_interval_carrier = "manual";
break;
case 1:
str_guard_interval_carrier = "auto";
break;
default:
str_guard_interval_carrier = "?";
}
/* interleave, 0x82[0] */
switch ((buf[2] >> 0) & 0x01) {
case 0:
str_interleave = "M=720";
break;
case 1:
str_interleave = "M=240";
break;
default:
str_interleave = "?";
}
/* interleave set, 0x82[1] */
switch ((buf[2] >> 1) & 0x01) {
case 0:
str_interleave_ = "manual";
break;
case 1:
str_interleave_ = "auto";
break;
default:
str_interleave_ = "?";
}
/*
* We can read out current detected NCO and use that value next
* time instead of calculating new value from targed IF.
* I think it will not effect receiver sensitivity but gaining lock
* after tune could be easier...
*/
ret = hd29l2_rd_regs(priv, 0xb1, &buf[0], 3);
if (ret)
goto err;
if_ctl = (buf[0] << 16) | ((buf[1] - 7) << 8) | buf[2];
dbg("%s: %s %s %s | %s %s %s | %s %s | NCO=%06x", __func__,
str_constellation, str_code_rate, str_constellation_code_rate,
str_guard_interval, str_carrier, str_guard_interval_carrier,
str_interleave, str_interleave_, if_ctl);
return 0;
err:
dbg("%s: failed=%d", __func__, ret);
return ret;
}
static int hd29l2_init(struct dvb_frontend *fe)
{
int ret, i;
struct hd29l2_priv *priv = fe->demodulator_priv;
u8 tmp;
static const struct reg_val tab[] = {
{ 0x3a, 0x06 },
{ 0x3b, 0x03 },
{ 0x3c, 0x04 },
{ 0xaf, 0x06 },
{ 0xb0, 0x1b },
{ 0x80, 0x64 },
{ 0x10, 0x38 },
};
dbg("%s:", __func__);
/* reset demod */
/* it is recommended to HW reset chip using RST_N pin */
if (fe->callback) {
ret = fe->callback(fe, DVB_FRONTEND_COMPONENT_DEMOD, 0, 0);
if (ret)
goto err;
/* reprogramming needed because HW reset clears registers */
priv->tuner_i2c_addr_programmed = false;
}
/* init */
for (i = 0; i < ARRAY_SIZE(tab); i++) {
ret = hd29l2_wr_reg(priv, tab[i].reg, tab[i].val);
if (ret)
goto err;
}
/* TS params */
ret = hd29l2_rd_reg(priv, 0x36, &tmp);
if (ret)
goto err;
tmp &= 0x1b;
tmp |= priv->cfg.ts_mode;
ret = hd29l2_wr_reg(priv, 0x36, tmp);
if (ret)
goto err;
ret = hd29l2_rd_reg(priv, 0x31, &tmp);
tmp &= 0xef;
if (!(priv->cfg.ts_mode >> 7))
/* set b4 for serial TS */
tmp |= 0x10;
ret = hd29l2_wr_reg(priv, 0x31, tmp);
if (ret)
goto err;
return ret;
err:
dbg("%s: failed=%d", __func__, ret);
return ret;
}
static void hd29l2_release(struct dvb_frontend *fe)
{
struct hd29l2_priv *priv = fe->demodulator_priv;
kfree(priv);
}
static struct dvb_frontend_ops hd29l2_ops;
struct dvb_frontend *hd29l2_attach(const struct hd29l2_config *config,
struct i2c_adapter *i2c)
{
int ret;
struct hd29l2_priv *priv = NULL;
u8 tmp;
/* allocate memory for the internal state */
priv = kzalloc(sizeof(struct hd29l2_priv), GFP_KERNEL);
if (priv == NULL)
goto err;
/* setup the state */
priv->i2c = i2c;
memcpy(&priv->cfg, config, sizeof(struct hd29l2_config));
/* check if the demod is there */
ret = hd29l2_rd_reg(priv, 0x00, &tmp);
if (ret)
goto err;
/* create dvb_frontend */
memcpy(&priv->fe.ops, &hd29l2_ops, sizeof(struct dvb_frontend_ops));
priv->fe.demodulator_priv = priv;
return &priv->fe;
err:
kfree(priv);
return NULL;
}
EXPORT_SYMBOL(hd29l2_attach);
static struct dvb_frontend_ops hd29l2_ops = {
.delsys = { SYS_DVBT },
.info = {
.name = "HDIC HD29L2 DMB-TH",
.frequency_min = 474000000,
.frequency_max = 858000000,
.frequency_stepsize = 10000,
.caps = FE_CAN_FEC_AUTO |
FE_CAN_QPSK |
FE_CAN_QAM_16 |
FE_CAN_QAM_32 |
FE_CAN_QAM_64 |
FE_CAN_QAM_AUTO |
FE_CAN_TRANSMISSION_MODE_AUTO |
FE_CAN_BANDWIDTH_AUTO |
FE_CAN_GUARD_INTERVAL_AUTO |
FE_CAN_HIERARCHY_AUTO |
FE_CAN_RECOVER
},
.release = hd29l2_release,
.init = hd29l2_init,
.get_frontend_algo = hd29l2_get_frontend_algo,
.search = hd29l2_search,
.get_frontend = hd29l2_get_frontend,
.read_status = hd29l2_read_status,
.read_snr = hd29l2_read_snr,
.read_signal_strength = hd29l2_read_signal_strength,
.read_ber = hd29l2_read_ber,
.read_ucblocks = hd29l2_read_ucblocks,
.i2c_gate_ctrl = hd29l2_i2c_gate_ctrl,
};
MODULE_AUTHOR("Antti Palosaari <crope@iki.fi>");
MODULE_DESCRIPTION("HDIC HD29L2 DMB-TH demodulator driver");
MODULE_LICENSE("GPL");
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