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/*
Driver for STV0297 demodulator
Copyright (C) 2003-2004 Dennis Noermann <dennis.noermann@noernet.de>
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 <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/string.h>
#include <linux/delay.h>
#include "dvb_frontend.h"
#include "stv0297.h"
struct stv0297_state {
struct i2c_adapter* i2c;
struct dvb_frontend_ops ops;
const struct stv0297_config* config;
struct dvb_frontend frontend;
};
#if 0
#define dprintk(x...) printk(x)
#else
#define dprintk(x...)
#endif
#define STV0297_CLOCK 28900
static u8 init_tab [] = {
0x80, 0x01, /* soft_reset */
0x80, 0x00, /* cleared soft_reset */
0x81, 0x01, /* deinterleaver descrambler reset */
0x81, 0x00, /* cleared deinterleaver descrambler reset */
0x83, 0x10, /* the Reed-Solomon block reset*/
0x83, 0x00, /* cleared the Reed-Solomon block reset */
0x84, 0x2b, /* clears the equalizer and also reinitializes the Reg. 00through 04. */
0x84, 0x2a, /* cleares it .. */
0x03, 0x00,
0x25, 0x88,
0x30, 0x97,
0x31, 0x4C,
0x32, 0xFF,
0x33, 0x55,
0x34, 0x00,
0x35, 0x65,
0x36, 0x80,
0x40, 0x1C,
0x42, 0x3C,
0x43, 0x00,
0x52, 0x28,
0x5A, 0x1E,
0x5B, 0x05,
0x62, 0x06,
0x6A, 0x02,
0x70, 0xFF,
0x71, 0x84,
0x83, 0x10,
0x84, 0x25,
0x85, 0x00,
0x86, 0x78,
0x87, 0x73,
0x88, 0x08,
0x89, 0x00,
0x90, 0x05,
0xA0, 0x00,
0xB0, 0x91,
0xB1, 0x0B,
0xC0, 0x4B,
0xC1, 0x01,
0xC2, 0x00,
0xDE, 0x00,
0xDF, 0x03,
0x87, 0x73
};
static int stv0297_writereg (struct stv0297_state* state, u8 reg, u8 data)
{
int ret;
u8 buf [] = { reg, data };
struct i2c_msg msg = { .addr = state->config->demod_address, .flags = 0, .buf = buf, .len = 2 };
ret = i2c_transfer (state->i2c, &msg, 1);
if (ret != 1)
dprintk("%s: writereg error (reg == 0x%02x, val == 0x%02x, "
"ret == %i)\n", __FUNCTION__, reg, data, ret);
return (ret != 1) ? -1 : 0;
}
static int stv0297_writeregs (struct stv0297_state* state, u8 *data, int len)
{
int ret;
struct i2c_msg msg = { .addr = state->config->demod_address, .flags = 0, .buf = data, .len = len };
ret = i2c_transfer (state->i2c, &msg, 1);
if (ret != 1)
dprintk("%s: writeregs error\n ", __FUNCTION__);
return (ret != 1) ? -1 : 0;
}
static u8 stv0297_readreg (struct stv0297_state* state, u8 reg)
{
int ret;
u8 b0[] = { reg };
u8 b1[] = { 0 };
struct i2c_msg msg [] = { { .addr = state->config->demod_address, .flags = 0, .buf = b0, .len = 1 },
{ .addr = state->config->demod_address, .flags = I2C_M_RD, .buf = b1, .len = 1 } };
ret = i2c_transfer (state->i2c, msg, 2);
if (ret != 2)
dprintk("%s: readreg error (reg == 0x%02x, ret == %i)\n",
__FUNCTION__, reg, ret);
return b1[0];
}
static int stv0297_readregs (struct stv0297_state* state, u8 reg1, u8 *b, u8 len)
{
int ret;
struct i2c_msg msg [] = { { .addr = state->config->demod_address, .flags = 0, .buf = ®1, .len = 1 },
{ .addr = state->config->demod_address, .flags = I2C_M_RD, .buf = b, .len = len } };
ret = i2c_transfer (state->i2c, msg, 2);
if (ret != 2)
dprintk("%s: readreg error (ret == %i)\n", __FUNCTION__, ret);
return ret == 2 ? 0 : ret;
}
static int stv0297_set_symbolrate (struct stv0297_state* state, u32 srate)
{
/*
Betanova sniff : 690000
stv0297_writereg (i2c, 0x55, 0x4E);
stv0297_writereg (i2c, 0x56, 0x00);
stv0297_writereg (i2c, 0x57, 0x1F);
stv0297_writereg (i2c, 0x58, 0x3D);
*/
long tmp, ExtClk;
ExtClk = (long)(STV0297_CLOCK) / 4; /* 1/4 = 2^-2 */
tmp = 131072L * srate; /* 131072 = 2^17 */
tmp = tmp /ExtClk;
tmp = tmp * 8192L; /* 8192 = 2^13 */
stv0297_writereg (state, 0x55,(unsigned char)(tmp & 0xFF));
stv0297_writereg (state, 0x56,(unsigned char)(tmp>> 8));
stv0297_writereg (state, 0x57,(unsigned char)(tmp>>16));
stv0297_writereg (state, 0x58,(unsigned char)(tmp>>24));
return 0;
}
void stv0297_set_sweeprate(struct stv0297_state* state, short _FShift, long _SymbolRate)
{
long long_tmp;
short FShift ;
unsigned char carrier;
int RegSymbolRate;
FShift = _FShift; /* in mS .. +/- 5,100 S von 6975 S */
RegSymbolRate = _SymbolRate; //RegGetSRate() ; /* in KHz */
if(RegSymbolRate <= 0) return ;
long_tmp = (long)FShift * 262144L ; // 262144 = 2*18
long_tmp /= RegSymbolRate ;
long_tmp *= 1024 ; // 1024 = 2*10
if(long_tmp >= 0)
long_tmp += 500000 ;
else long_tmp -= 500000 ;
long_tmp /= 1000000 ;
stv0297_writereg (state, 0x60,(unsigned char)(long_tmp & 0xFF));
carrier = stv0297_readreg(state, 0x69) & ~ 0xF0;
carrier |= (unsigned char)((long_tmp>>4) & 0xF0);
stv0297_writereg (state, 0x69, carrier);
return;
}
void stv0297_set_frequencyoffset(struct stv0297_state* state, long _CarrierOffset)
{
long long_tmp;
unsigned char sweep;
long_tmp = _CarrierOffset * 26844L ; /* (2**28)/10000 */
if(long_tmp < 0) long_tmp += 0x10000000 ;
long_tmp &= 0x0FFFFFFF ;
stv0297_writereg (state,0x66,(unsigned char)(long_tmp & 0xFF)); // iphase0
stv0297_writereg (state,0x67,(unsigned char)(long_tmp>>8)); // iphase1
stv0297_writereg (state,0x68,(unsigned char)(long_tmp>>16)); // iphase2
sweep = stv0297_readreg(state,0x69) & 0xF0;
sweep |= ((unsigned char)(long_tmp>>24) & 0x0F);
stv0297_writereg (state,0x69,sweep);
return;
}
static int stv0297_init (struct dvb_frontend* fe)
{
struct stv0297_state* state = (struct stv0297_state*) fe->demodulator_priv;
int i;
dprintk("stv0297: init chip\n");
for (i=0; i<sizeof(init_tab); i+=2) {
stv0297_writereg (state, init_tab[i], init_tab[i+1]);
}
return 0;
}
static int stv0297_read_status(struct dvb_frontend* fe, fe_status_t* status)
{
struct stv0297_state* state = (struct stv0297_state*) fe->demodulator_priv;
u8 sync = stv0297_readreg (state, 0xDF);
*status = 0;
if (sync & 0x80)
*status |= FE_HAS_SYNC | FE_HAS_SIGNAL;
if (sync & 0x80)
*status |= FE_HAS_CARRIER;
if (sync & 0x80)
*status |= FE_HAS_VITERBI;
if (sync & 0x80)
*status |= FE_HAS_LOCK;
return 0;
}
static int stv0297_read_ber(struct dvb_frontend* fe, u32* ber)
{
struct stv0297_state* state = (struct stv0297_state*) fe->demodulator_priv;
u8 BER[3];
stv0297_writereg (state, 0xA0, 0x80); // Start Counting bit errors for 4096 Bytes
mdelay(25); // Hopefully got 4096 Bytes
stv0297_readregs (state, 0xA0, BER, 3);
mdelay(25);
*ber = (BER[2] << 8 | BER[1]) / ( 8 * 4096);
return 0;
}
static int stv0297_read_signal_strength(struct dvb_frontend* fe, u16* strength)
{
struct stv0297_state* state = (struct stv0297_state*) fe->demodulator_priv;
u8 STRENGTH[2];
mdelay(25);
stv0297_readregs (state, 0x41, STRENGTH, 2);
*strength = (STRENGTH[1] & 0x03) << 8 | STRENGTH[0];
return 0;
}
static int stv0297_read_snr(struct dvb_frontend* fe, u16* snr)
{
struct stv0297_state* state = (struct stv0297_state*) fe->demodulator_priv;
u8 SNR[2];
mdelay(25);
stv0297_readregs (state, 0x07, SNR, 2);
*snr = SNR[1] << 8 | SNR[0];
return 0;
}
static int stv0297_read_ucblocks(struct dvb_frontend* fe, u32* ucblocks)
{
struct stv0297_state* state = (struct stv0297_state*) fe->demodulator_priv;
*ucblocks = (stv0297_readreg (state, 0xD5) << 8)
| stv0297_readreg (state, 0xD4);
return 0;
}
static int stv0297_set_frontend(struct dvb_frontend* fe, struct dvb_frontend_parameters * p)
{
struct stv0297_state* state = (struct stv0297_state*) fe->demodulator_priv;
u8 buf2[] = { 0x83, 0x10, 0x25, 0x00, 0x78, 0x73 };
u8 buf3[] = { 0xC0, 0x4B, 0x01, 0x00 };
int CarrierOffset = -500;
int SweepRate = 1380;
int SpectrumInversion = 0;
if (SpectrumInversion) {
SweepRate = -SweepRate ;
CarrierOffset = -CarrierOffset ;
}
else {
SweepRate = SweepRate ;
CarrierOffset = CarrierOffset ;
}
stv0297_writereg(state, 0x86, 0xF8);
state->config->pll_set(fe, p);
stv0297_writeregs (state, buf2, sizeof(buf2));
stv0297_writereg (state, 0x84, 0x24);
stv0297_writeregs (state, buf3, sizeof(buf3));
stv0297_writereg (state, 0x88, 0x08);
stv0297_writereg (state, 0x90, 0x01);
stv0297_writereg (state, 0x37, 0x20);
stv0297_writereg (state, 0x40, 0x19);
stv0297_writereg (state, 0x43, 0x40);
stv0297_writereg (state, 0x41, 0xE4);
stv0297_writereg (state, 0x42, 0x3C);
stv0297_writereg (state, 0x44, 0xFF);
stv0297_writereg (state, 0x49, 0x04);
stv0297_writereg (state, 0x4A, 0xFF);
stv0297_writereg (state, 0x4B, 0xFF);
stv0297_writereg (state, 0x71, 0x04);
stv0297_writereg (state, 0x53, 0x08);
stv0297_writereg (state, 0x5A, 0x3E); //3E forces the direct path to be immediately
stv0297_writereg (state, 0x5B, 0x07);
stv0297_writereg (state, 0x5B, 0x05);
stv0297_set_symbolrate (state, p->u.qam.symbol_rate/1000);
stv0297_writereg (state, 0x59, 0x08);
stv0297_writereg (state, 0x61, 0x49);
stv0297_writereg (state, 0x62, 0x0E);
stv0297_writereg (state, 0x6A, 0x02);
stv0297_writereg (state, 0x00, 0x48); // set qam-64
stv0297_writereg (state, 0x01, 0x58);
stv0297_writereg (state, 0x82, 0x00);
stv0297_writereg (state, 0x83, 0x08);
stv0297_set_sweeprate(state,SweepRate, p->u.qam.symbol_rate/1000);
stv0297_writereg (state, 0x20, 0x00);
stv0297_writereg (state, 0x21, 0x40);
stv0297_set_frequencyoffset(state,CarrierOffset);
stv0297_writereg (state, 0x82, 0x00);
stv0297_writereg (state, 0x85, 0x04);
stv0297_writereg (state, 0x43, 0x10);
stv0297_writereg (state, 0x5A, 0x5E);
stv0297_writereg (state, 0x6A, 0x03);
stv0297_writereg (state, 0x85, 0x04);
stv0297_writereg (state, 0x6B, 0x00);
stv0297_writereg (state, 0x4A, 0xFF);
stv0297_writereg (state, 0x61, 0x49);
stv0297_writereg (state, 0x62, 0x0E);
stv0297_writereg (state, 0xDF, 0x02);
stv0297_writereg (state, 0xDF, 0x01);
stv0297_writereg (state, 0xDF, 0x02);
stv0297_writereg (state, 0xDF, 0x01);
stv0297_writereg (state, 0xDF, 0x02);
stv0297_writereg (state, 0xDF, 0x01);
return 0;
}
static void stv0297_release(struct dvb_frontend* fe)
{
struct stv0297_state* state = (struct stv0297_state*) fe->demodulator_priv;
kfree(state);
}
static struct dvb_frontend_ops stv0297_ops;
struct dvb_frontend* stv0297_attach(const struct stv0297_config* config,
struct i2c_adapter* i2c)
{
struct stv0297_state* state = NULL;
int id;
/* allocate memory for the internal state */
state = (struct stv0297_state*) kmalloc(sizeof(struct stv0297_state), GFP_KERNEL);
if (state == NULL) goto error;
/* setup the state */
state->config = config;
state->i2c = i2c;
memcpy(&state->ops, &stv0297_ops, sizeof(struct dvb_frontend_ops));
/* check if the demod is there */
stv0297_writereg(state, 0x02, 0x34); /* standby off */
msleep(200);
id = stv0297_readreg(state, 0x00);
/* register 0x00 contains 0xa1 for STV0299 and STV0299B */
/* register 0x00 might contain 0x80 when returning from standby */
if (id != 0xa1 && id != 0x80) goto error;
/* create dvb_frontend */
state->frontend.ops = &state->ops;
state->frontend.demodulator_priv = state;
return &state->frontend;
error:
if (state) kfree(state);
return NULL;
}
static struct dvb_frontend_ops stv0297_ops = {
.info = {
.name = "ST STV0297 DVB-C",
.type = FE_QAM,
.frequency_min = 64000000,
.frequency_max = 1300000000,
.frequency_stepsize = 62500,
.symbol_rate_min = 870000,
.symbol_rate_max = 11700000,
.caps = FE_CAN_QAM_16 | FE_CAN_QAM_32 | FE_CAN_QAM_64 |
FE_CAN_QAM_128 | FE_CAN_QAM_256 |
FE_CAN_FEC_AUTO | FE_CAN_INVERSION_AUTO |
FE_CAN_RECOVER
},
.release = stv0297_release,
.init = stv0297_init,
.set_frontend = stv0297_set_frontend,
.read_status = stv0297_read_status,
.read_ber = stv0297_read_ber,
.read_signal_strength = stv0297_read_signal_strength,
.read_snr = stv0297_read_snr,
.read_ucblocks = stv0297_read_ucblocks,
};
MODULE_DESCRIPTION("ST STV0297 DVB-C Demodulator driver");
MODULE_AUTHOR("Dennis Noermann");
MODULE_LICENSE("GPL");
EXPORT_SYMBOL(stv0297_attach);
|