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|
/*
NxtWave Communications - NXT6000 demodulator driver
Copyright (C) 2002-2003 Florian Schirmer <jolt@tuxbox.org>
Copyright (C) 2003 Paul Andreassen <paul@andreassen.com.au>
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/slab.h>
#include "dvb_frontend.h"
#include "nxt6000_priv.h"
#include "nxt6000.h"
struct nxt6000_state {
struct i2c_adapter* i2c;
/* configuration settings */
const struct nxt6000_config* config;
struct dvb_frontend frontend;
};
static int debug;
#define dprintk if (debug) printk
static int nxt6000_writereg(struct nxt6000_state* state, u8 reg, u8 data)
{
u8 buf[] = { reg, data };
struct i2c_msg msg = {.addr = state->config->demod_address,.flags = 0,.buf = buf,.len = 2 };
int ret;
if ((ret = i2c_transfer(state->i2c, &msg, 1)) != 1)
dprintk("nxt6000: nxt6000_write error (reg: 0x%02X, data: 0x%02X, ret: %d)\n", reg, data, ret);
return (ret != 1) ? -EFAULT : 0;
}
static u8 nxt6000_readreg(struct nxt6000_state* state, u8 reg)
{
int ret;
u8 b0[] = { reg };
u8 b1[] = { 0 };
struct i2c_msg msgs[] = {
{.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, msgs, 2);
if (ret != 2)
dprintk("nxt6000: nxt6000_read error (reg: 0x%02X, ret: %d)\n", reg, ret);
return b1[0];
}
static void nxt6000_reset(struct nxt6000_state* state)
{
u8 val;
val = nxt6000_readreg(state, OFDM_COR_CTL);
nxt6000_writereg(state, OFDM_COR_CTL, val & ~COREACT);
nxt6000_writereg(state, OFDM_COR_CTL, val | COREACT);
}
static int nxt6000_set_bandwidth(struct nxt6000_state* state, fe_bandwidth_t bandwidth)
{
u16 nominal_rate;
int result;
switch (bandwidth) {
case BANDWIDTH_6_MHZ:
nominal_rate = 0x55B7;
break;
case BANDWIDTH_7_MHZ:
nominal_rate = 0x6400;
break;
case BANDWIDTH_8_MHZ:
nominal_rate = 0x7249;
break;
default:
return -EINVAL;
}
if ((result = nxt6000_writereg(state, OFDM_TRL_NOMINALRATE_1, nominal_rate & 0xFF)) < 0)
return result;
return nxt6000_writereg(state, OFDM_TRL_NOMINALRATE_2, (nominal_rate >> 8) & 0xFF);
}
static int nxt6000_set_guard_interval(struct nxt6000_state* state, fe_guard_interval_t guard_interval)
{
switch (guard_interval) {
case GUARD_INTERVAL_1_32:
return nxt6000_writereg(state, OFDM_COR_MODEGUARD, 0x00 | (nxt6000_readreg(state, OFDM_COR_MODEGUARD) & ~0x03));
case GUARD_INTERVAL_1_16:
return nxt6000_writereg(state, OFDM_COR_MODEGUARD, 0x01 | (nxt6000_readreg(state, OFDM_COR_MODEGUARD) & ~0x03));
case GUARD_INTERVAL_AUTO:
case GUARD_INTERVAL_1_8:
return nxt6000_writereg(state, OFDM_COR_MODEGUARD, 0x02 | (nxt6000_readreg(state, OFDM_COR_MODEGUARD) & ~0x03));
case GUARD_INTERVAL_1_4:
return nxt6000_writereg(state, OFDM_COR_MODEGUARD, 0x03 | (nxt6000_readreg(state, OFDM_COR_MODEGUARD) & ~0x03));
default:
return -EINVAL;
}
}
static int nxt6000_set_inversion(struct nxt6000_state* state, fe_spectral_inversion_t inversion)
{
switch (inversion) {
case INVERSION_OFF:
return nxt6000_writereg(state, OFDM_ITB_CTL, 0x00);
case INVERSION_ON:
return nxt6000_writereg(state, OFDM_ITB_CTL, ITBINV);
default:
return -EINVAL;
}
}
static int nxt6000_set_transmission_mode(struct nxt6000_state* state, fe_transmit_mode_t transmission_mode)
{
int result;
switch (transmission_mode) {
case TRANSMISSION_MODE_2K:
if ((result = nxt6000_writereg(state, EN_DMD_RACQ, 0x00 | (nxt6000_readreg(state, EN_DMD_RACQ) & ~0x03))) < 0)
return result;
return nxt6000_writereg(state, OFDM_COR_MODEGUARD, (0x00 << 2) | (nxt6000_readreg(state, OFDM_COR_MODEGUARD) & ~0x04));
case TRANSMISSION_MODE_8K:
case TRANSMISSION_MODE_AUTO:
if ((result = nxt6000_writereg(state, EN_DMD_RACQ, 0x02 | (nxt6000_readreg(state, EN_DMD_RACQ) & ~0x03))) < 0)
return result;
return nxt6000_writereg(state, OFDM_COR_MODEGUARD, (0x01 << 2) | (nxt6000_readreg(state, OFDM_COR_MODEGUARD) & ~0x04));
default:
return -EINVAL;
}
}
static void nxt6000_setup(struct dvb_frontend* fe)
{
struct nxt6000_state* state = fe->demodulator_priv;
nxt6000_writereg(state, RS_COR_SYNC_PARAM, SYNC_PARAM);
nxt6000_writereg(state, BER_CTRL, /*(1 << 2) | */ (0x01 << 1) | 0x01);
nxt6000_writereg(state, VIT_BERTIME_2, 0x00); // BER Timer = 0x000200 * 256 = 131072 bits
nxt6000_writereg(state, VIT_BERTIME_1, 0x02); //
nxt6000_writereg(state, VIT_BERTIME_0, 0x00); //
nxt6000_writereg(state, VIT_COR_INTEN, 0x98); // Enable BER interrupts
nxt6000_writereg(state, VIT_COR_CTL, 0x82); // Enable BER measurement
nxt6000_writereg(state, VIT_COR_CTL, VIT_COR_RESYNC | 0x02 );
nxt6000_writereg(state, OFDM_COR_CTL, (0x01 << 5) | (nxt6000_readreg(state, OFDM_COR_CTL) & 0x0F));
nxt6000_writereg(state, OFDM_COR_MODEGUARD, FORCEMODE8K | 0x02);
nxt6000_writereg(state, OFDM_AGC_CTL, AGCLAST | INITIAL_AGC_BW);
nxt6000_writereg(state, OFDM_ITB_FREQ_1, 0x06);
nxt6000
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