/*
* at76c651.c
*
* Atmel DVB-C Frontend Driver (at76c651/tua6010xs)
*
* Copyright (C) 2001 fnbrd <fnbrd@gmx.de>
* & 2002-2004 Andreas Oberritter <obi@linuxtv.org>
* & 2003 Wolfram Joost <dbox2@frokaschwei.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.
*
* AT76C651
* http://www.nalanda.nitc.ac.in/industry/datasheets/atmel/acrobat/doc1293.pdf
* http://www.atmel.com/atmel/acrobat/doc1320.pdf
*/
#include <linux/init.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/slab.h>
#include <linux/bitops.h>
#include "dvb_frontend.h"
#include "at76c651.h"
struct at76c651_state {
struct i2c_adapter* i2c;
struct dvb_frontend_ops ops;
const struct at76c651_config* config;
struct dvb_frontend frontend;
/* revision of the chip */
u8 revision;
/* last QAM value set */
u8 qam;
};
static int debug;
#define dprintk(args...) \
do { \
if (debug) printk(KERN_DEBUG "at76c651: " args); \
} while (0)
#if ! defined(__powerpc__)
static __inline__ int __ilog2(unsigned long x)
{
int i;
if (x == 0)
return -1;
for (i = 0; x != 0; i++)
x >>= 1;
return i - 1;
}
#endif
static int at76c651_writereg(struct at76c651_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);
msleep(10);
return (ret != 1) ? -EREMOTEIO : 0;
}
static u8 at76c651_readreg(struct at76c651_state* state, u8 reg)
{
int ret;
u8 val;
struct i2c_msg msg[] = {
{ .addr = state->config->demod_address, .flags = 0, .buf = ®, .len = 1 },
{ .addr = state->config->demod_address, .flags = I2C_M_RD, .buf = &val, .len = 1 }
};
ret = i2c_transfer(state->i2c, msg, 2);
if (ret != 2)
dprintk("%s: readreg error (ret == %i)\n", __FUNCTION__, ret);
return val;
}
static int at76c651_reset(struct at76c651_state* state)
{
return at76c651_writereg(state, 0x07, 0x01);
}
static void at76c651_disable_interrupts(struct at76c651_state* state)
{
at76c651_writereg(state, 0x0b, 0x00);
}
static int at76c651_set_auto_config(struct at76c651_state *state)
{
/*
* Autoconfig
*/
at76c651_writereg(state, 0x06, 0x01);
/*
* Performance optimizations, should be done after autoconfig
*/
at76c651_writereg(state, 0x10, 0x06);
at76c651_writereg(state, 0x11, ((state->qam == 5) || (state->qam == 7)) ? 0x12 : 0x10);
at76c651_writereg(state, 0x15, 0x28);
at76c651_writereg(state, 0x20, 0x09);
at76c651_writereg(state, 0x24, ((state->qam == 5) || (state->qam == 7)) ? 0xC0 : 0x90);
at76c651_writereg(state, 0x30, 0x90);
if (state->qam == 5)
at76c651_writereg(state, 0x35, 0x2A);
/*
* Initialize A/D-converter
*/
if (state->revision == 0x11) {
at76c651_writereg(state, 0x2E, 0x38);
at76c651_writereg(state, 0x2F, 0x13);
}
at76c651_disable_interrupts(state);
/*
* Restart operation
*/
at76c651_reset(state);
return 0;
}
static void at76c651_set_bbfreq(struct at76c651_state* state)
{
at76c651_writereg(state, 0x04, 0x3f);
at76c651_writereg(state, 0x05, 0xee);
}
static int at76c651_set_symbol_rate(struct at76c651_state* state, u32 symbol_rate)
{
u8 exponent;
u32 mantissa;
if (symbol_rate > 9360000)
return -EINVAL;
/*
* FREF = 57800 kHz
* exponent = 10 + floor (log2(symbol_rate / FREF))
* mantissa = (symbol_rate / FREF) * (1 << (30 - exponent))
*/
exponent = __ilog2((symbol_rate << 4) / 903125);
mantissa = ((symbol_rate / 3125) * (1 << (24 - exponent))) / 289;
at76c651_writereg(state, 0x00, mantissa >> 13);
at76c651_writereg(state, 0x01, mantissa >> 5);
at76c651_writereg(state, 0x02, (mantissa << 3) | exponent);
return 0;
}
static int at76c651_set_qam(struct at76c651_state *state, fe_modulation_t qam)
{
switch (qam) {
case QPSK:
state->qam = 0x02;
break;
case QAM_16:
state->qam = 0x04;
break;
case QAM_32:
state->qam = 0x05;
break;
case QAM_64:
state->qam = 0x06;
break;
case QAM_128:
state->qam = 0x07;
break;
case QAM_256:
state->qam = 0x08;
break;
#if 0
case QAM_512:
state->qam = 0x09;
break;
case QAM_1024:
state->qam = 0x0A;
break;
#endif
default:
return -EINVAL;
}
return at76c651_writereg(state, 0x03, state->qam);
}
static int at76c651_set_inversion(struct at76c651_state* state, fe_spectral_inversion_t inversion)
{
u8 feciqinv = at76c651_readreg(state, 0x60);
switch (inversion) {
case INVERSION_OFF:
feciqinv |= 0x02;
feciqinv &= 0xFE;
break;
case INVERSION_ON:
feciqinv |= 0x03;
break;
case INVERSION_AUTO:
feciqinv &= 0xFC;
break;
default:
return -EINVAL;
}
return at76c651_writereg(state, 0x60, feciqinv);
}
static int at76c651_set_parameters(struct dvb_frontend* fe,
struct dvb_frontend_parameters *p)
{
int ret;
struct at76c651_state* state = fe->demodulator_priv;
at76c651_writereg(state, 0x0c, 0xc3);
state->config->pll_set(fe, p);
at76c651_writereg(state, 0x0c, 0xc2);
if ((ret = at76c651_set_symbol_rate(state, p->u.qam.symbol_rate)))
return ret;
if ((ret = at76c651_set_inversion(state, p->inversion)))
return ret;
return at76c651_set_auto_config(state);
}
static int at76c651_set_defaults(struct dvb_frontend* fe)
{
struct at76c651_state* state = fe->demodulator_priv;
at76c651_set_symbol_rate(state, 6900000);
at76c651_set_qam(state, QAM_64);
at76c651_set_bbfreq(state);
at76c651_set_auto_config(state);
if (state->config->pll_init) {
at76c651_writereg(state, 0x0c, 0xc3);
state->config->pll_init(fe);
at76c651_writereg(state, 0x0c, 0xc2);
}
return 0;
}
static int at76c651_read_status(struct dvb_frontend* fe, fe_status_t* status)
{
struct at76c651_state* state = fe->demodulator_priv;
u8 sync;
/*
* Bits: FEC, CAR, EQU, TIM, AGC2, AGC1, ADC, PLL (PLL=0)
*/
sync = at76c651_readreg(state, 0x80);
*status = 0;
if (sync & (0x04 | 0x10)) /* AGC1 || TIM */
*status |= FE_HAS_SIGNAL;
if (sync & 0x10) /* TIM */
*status |= FE_HAS_CARRIER;
if (sync & 0x80) /* FEC */
*status |= FE_HAS_VITERBI;
if (sync & 0x40) /* CAR */
*status |= FE_HAS_SYNC;
if ((sync & 0xF0) == 0xF0) /* TIM && EQU && CAR && FEC */
*status |= FE_HAS_LOCK;
return 0;
}
static int at76c651_read_ber(struct dvb_frontend* fe, u32* ber)
{
struct at76c651_state* state = fe->demodulator_priv;
*ber = (at76c651_readreg(state, 0x81) & 0x0F) << 16;
*ber |= at76c651_readreg(state, 0x82) << 8;
*ber |= at76c651_readreg(state, 0x83);
*ber *= 10;
return 0;
}
static int at76c651_read_signal_strength(struct dvb_frontend* fe, u16* strength)
{
struct at76c651_state* state = fe->demodulator_priv;
u8 gain = ~at76c651_readreg(state, 0x91);
*strength = (gain << 8) | gain;
return 0;
}
static int at76c651_read_snr(struct dvb_frontend* fe, u16* snr)
{
struct at76c651_state* state = fe->demodulator_priv;
*snr = 0xFFFF -
((at76c651_readreg(state, 0x8F) << 8) |
at76c651_readreg(state, 0x90));
return 0;
}
static int at76c651_read_ucblocks(struct dvb_frontend* fe, u32* ucblocks)
{
struct at76c651_state* state = fe->demodulator_priv;
*ucblocks = at76c651_readreg(state, 0x82);
return 0;
}
static int at76c651_get_tune_settings(struct dvb_frontend* fe, struct dvb_frontend_tune_settings *fesettings)
{
fesettings->min_delay_ms = 50;
fesettings->step_size = 0;
fesettings->max_drift = 0;
return 0;
}
static void at76c651_release(struct dvb_frontend* fe)
{
struct at76c651_state* state = fe->demodulator_priv;
kfree(state);
}
static struct dvb_frontend_ops at76c651_ops;
struct dvb_frontend* at76c651_attach(const struct at76c651_config* config,
struct i2c_adapter* i2c)
{
struct at76c651_state* state = NULL;
/* allocate memory for the internal state */
state = kmalloc(sizeof(struct at76c651_state), GFP_KERNEL);
if (state == NULL) goto error;
/* setup the state */
state->config = config;
state->qam = 0;
/* check if the demod is there */
if (at76c651_readreg(state, 0x0e) != 0x65) goto error;
/* finalise state setup */
state->i2c = i2c;
state->revision = at76c651_readreg(state, 0x0f) & 0xfe;
memcpy(&state->ops, &at76c651_ops, sizeof(struct dvb_frontend_ops));
/* create dvb_frontend */
state->frontend.ops = &state->ops;
state->frontend.demodulator_priv = state;
return &state->frontend;
error:
kfree(state);
return NULL;
}
static struct dvb_frontend_ops at76c651_ops = {
.info = {
.name = "Atmel AT76C651B DVB-C",
.type = FE_QAM,
.frequency_min = 48250000,
.frequency_max = 863250000,
.frequency_stepsize = 62500,
/*.frequency_tolerance = */ /* FIXME: 12% of SR */
.symbol_rate_min = 0, /* FIXME */
.symbol_rate_max = 9360000, /* FIXME */
.symbol_rate_tolerance = 4000,
.caps = FE_CAN_INVERSION_AUTO |
FE_CAN_FEC_1_2 | FE_CAN_FEC_2_3 | FE_CAN_FEC_3_4 |
FE_CAN_FEC_4_5 | FE_CAN_FEC_5_6 | FE_CAN_FEC_6_7 |
FE_CAN_FEC_7_8 | FE_CAN_FEC_8_9 | FE_CAN_FEC_AUTO |
FE_CAN_QAM_16 | FE_CAN_QAM_32 | FE_CAN_QAM_64 | FE_CAN_QAM_128 |
FE_CAN_MUTE_TS | FE_CAN_QAM_256 | FE_CAN_RECOVER
},
.release = at76c651_release,
.init = at76c651_set_defaults,
.set_frontend = at76c651_set_parameters,
.get_tune_settings = at76c651_get_tune_settings,
.read_status = at76c651_read_status,
.read_ber = at76c651_read_ber,
.read_signal_strength = at76c651_read_signal_strength,
.read_snr = at76c651_read_snr,
.read_ucblocks = at76c651_read_ucblocks,
};
module_param(debug, int, 0644);
MODULE_PARM_DESC(debug, "Turn on/off frontend debugging (default:off).");
MODULE_DESCRIPTION("Atmel AT76C651 DVB-C Demodulator Driver");
MODULE_AUTHOR("Andreas Oberritter <obi@linuxtv.org>");
MODULE_LICENSE("GPL");
EXPORT_SYMBOL(at76c651_attach);
