/*
Conexant cx22700 DVB OFDM demodulator driver
Copyright (C) 2001-2002 Convergence Integrated Media GmbH
Holger Waechtler <holger@convergence.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/kernel.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/string.h>
#include <linux/slab.h>
#include "dvb_frontend.h"
#include "cx22700.h"
struct cx22700_state {
struct i2c_adapter* i2c;
struct dvb_frontend_ops ops;
const struct cx22700_config* config;
struct dvb_frontend frontend;
};
static int debug;
#define dprintk(args...) \
do { \
if (debug) printk(KERN_DEBUG "cx22700: " args); \
} while (0)
static u8 init_tab [] = {
0x04, 0x10,
0x05, 0x09,
0x06, 0x00,
0x08, 0x04,
0x09, 0x00,
0x0a, 0x01,
0x15, 0x40,
0x16, 0x10,
0x17, 0x87,
0x18, 0x17,
0x1a, 0x10,
0x25, 0x04,
0x2e, 0x00,
0x39, 0x00,
0x3a, 0x04,
0x45, 0x08,
0x46, 0x02,
0x47, 0x05,
};
static int cx22700_writereg (struct cx22700_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 };
dprintk ("%s\n", __FUNCTION__);
ret = i2c_transfer (state->i2c, &msg, 1);
if (ret != 1)
printk("%s: writereg error (reg == 0x%02x, val == 0x%02x, ret == %i)\n",
__FUNCTION__, reg, data, ret);
return (ret != 1) ? -1 : 0;
}
static int cx22700_readreg (struct cx22700_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 } };
dprintk ("%s\n", __FUNCTION__);
ret = i2c_transfer (state->i2c, msg, 2);
if (ret != 2) return -EIO;
return b1[0];
}
static int cx22700_set_inversion (struct cx22700_state* state, int inversion)
{
u8 val;
dprintk ("%s\n", __FUNCTION__);
switch (inversion) {
case INVERSION_AUTO:
return -EOPNOTSUPP;
case INVERSION_ON:
val = cx22700_readreg (state, 0x09);
return cx22700_writereg (state, 0x09, val | 0x01);
case INVERSION_OFF:
val = cx22700_readreg (state, 0x09);
return cx22700_writereg (state, 0x09, val & 0xfe);
default:
return -EINVAL;
}
}
static int cx22700_set_tps (struct cx22700_state *state, struct dvb_ofdm_parameters *p)
{
static const u8 qam_tab [4] = { 0, 1, 0, 2 };
static const u8 fec_tab [6] = { 0, 1, 2, 0, 3, 4 };
u8 val;
dprintk ("%s\n", __FUNCTION__);
if (p->code_rate_HP < FEC_1_2 || p->code_rate_HP > FEC_7_8)
return -EINVAL;
if (p->code_rate_LP < FEC_1_2 || p->code_rate_LP > FEC_7_8)
if (p->code_rate_HP == FEC_4_5 || p->code_rate_LP == FEC_4_5)
return -EINVAL;
if (p->guard_interval < GUARD_INTERVAL_1_32 ||
p->guard_interval > GUARD_INTERVAL_1_4)
return -EINVAL;
if (p->transmission_mode != TRANSMISSION_MODE_2K &&
p->transmission_mode != TRANSMISSION_MODE_8K)
return -EINVAL;
if (p->constellation != QPSK &&
p->constellation != QAM_16 &&
p->constellation != QAM_64)
return -EINVAL;
if (p->hierarchy_information < HIERARCHY_NONE ||
p->hierarchy_information > HIERARCHY_4)
return -EINVAL;
if (p->bandwidth < BANDWIDTH_8_MHZ && p->bandwidth > BANDWIDTH_6_MHZ)
return -EINVAL;
if (p->bandwidth == BANDWIDTH_7_MHZ)
cx22700_writereg (state, 0x09, cx22700_readreg (state, 0x09 | 0x10));
else
cx22700_writereg (state, 0x09, cx22700_readreg (state, 0x09 & ~0x10));
val = qam_tab[p->constellation - QPSK];
val |= p->hierarchy_information - HIERARCHY_NONE;
cx22700_writereg (state, 0x04, val);
val = fec_tab[p->code_rate_HP - FEC_1_2] << 3;
val |= fec_tab[p->code_rate_LP - FEC_1_2];
cx22700_writereg (state, 0x05, val);
val = (p->guard_interval - GUARD_INTERVAL_1_32) << 2;
val |= p->transmission_mode - TRANSMISSION_MODE_2K;
cx22700_writereg (state, 0x06, val);
cx22700_writereg (state, 0x08, 0x04 | 0x02); /* use user tps parameters */
cx22700_writereg (state, 0x08, 0x04); /* restart aquisition */
return 0;
}
static int cx22700_get_tps (struct cx22700_state* state, struct dvb_ofdm_parameters *p)
{
static const fe_modulation_t qam_tab [3] = { QPSK, QAM_16, QAM_64 };
static const fe_code_rate_t fec_tab [5] = { FEC_1_2, FEC_2_3, FEC_3_4,
FEC_5_6, FEC_7_8 };
u8 val;
dprintk ("%s\n", __FUNCTION__);
if (!(cx22700_readreg(state, 0x07) & 0x20)) /* tps valid? */
return -EAGAIN;
val = cx22700_readreg (state, 0x01);
if ((val & 0x7) > 4)
p->hierarchy_information = HIERARCHY_AUTO;
else
p->hierarchy_information = HIERARCHY_NONE + (val & 0x7);
if (((val >> 3) & 0x3) > 2)
p->constellation = QAM_AUTO;
else
p->constellation = qam_tab[(val >> 3) & 0x3];
val = cx22700_readreg (state, 0x02);
if (((val >> 3) & 0x07) > 4)
p->code_rate_HP = FEC_AUTO;
else
p->code_rate_HP = fec_tab[(val >> 3) & 0x07];
if ((val & 0x07) > 4)
p->code_rate_LP = FEC_AUTO;
else
p->code_rate_LP = fec_tab[val & 0x07];
val = cx22700_readreg (state, 0x03);
p->guard_interval = GUARD_INTERVAL_1_32 + ((val >> 6) & 0x3);
p->transmission_mode = TRANSMISSION_MODE_2K + ((val >> 5) & 0x1);
return 0;
}
static int cx22700_init (struct dvb_frontend* fe)
{ struct cx22700_state* state = (struct cx22700_state*) fe->demodulator_priv;
int i;
dprintk("cx22700_init: init chip\n");
cx22700_writereg (state, 0x00, 0x02); /* soft reset */
cx22700_writereg (state, 0x00, 0x00);
msleep(10);
for (i=0; i<sizeof(init_tab); i+=2)
cx22700_writereg (state, init_tab[i], init_tab[i+1]);
cx22700_writereg (state, 0x00, 0x01);
if (state->config->pll_init) {
cx22700_writereg (state, 0x0a, 0x00); /* open i2c bus switch */
state->config->pll_init(fe);
cx22700_writereg (state, 0x0a, 0x01); /* close i2c bus switch */
}
return 0;
}
static int cx22700_read_status(struct dvb_frontend* fe, fe_status_t* status)
{
struct cx22700_state* state = (struct cx22700_state*) fe->demodulator_priv;
u16 rs_ber = (cx22700_readreg (state, 0x0d) << 9)
| (cx22700_readreg (state, 0x0e) << 1);
u8 sync = cx22700_readreg (state, 0x07);
*status = 0;
if (rs_ber < 0xff00)
*status |= FE_HAS_SIGNAL;
if (sync & 0x20)
*status |= FE_HAS_CARRIER;
if (sync & 0x10)
*status |= FE_HAS_VITERBI;
if (sync & 0x10)
*status |= FE_HAS_SYNC;
if (*status == 0x0f)
*status |= FE_HAS_LOCK;
return 0;
}
static int cx22700_read_ber(struct dvb_frontend* fe, u32* ber)
{
struct cx22700_state* state = (struct cx22700_state*) fe->demodulator_priv;
*ber = cx22700_readreg (state, 0x0c) & 0x7f;
cx22700_writereg (state, 0x0c, 0x00);
return 0;
}
static int cx22700_read_signal_strength(struct dvb_frontend* fe, u16* signal_strength)
{
struct cx22700_state* state = (struct cx22700_state*) fe->demodulator_priv;
u16 rs_ber = (cx22700_readreg (state, 0x0d) << 9)
| (cx22700_readreg (state, 0x0e) << 1);
*signal_strength = ~rs_ber;
return 0;
}
static int cx22700_read_snr(struct dvb_frontend* fe, u16* snr)
{
struct cx22700_state* state = (struct cx22700_state*) fe->demodulator_priv;
u16 rs_ber = (cx22700_readreg (state, 0x0d) << 9)
| (cx22700_readreg (state, 0x0e) << 1);
*snr = ~rs_ber;
return 0;
}
static int cx22700_read_ucblocks(struct dvb_frontend* fe, u32* ucblocks)
{
struct cx22700_state* state = (struct cx22700_state*) fe->demodulator_priv;
*ucblocks = cx22700_readreg (state, 0x0f);
cx22700_writereg (state, 0x0f, 0x00);
return 0;
}
static int cx22700_set_frontend(struct dvb_frontend* fe, struct dvb_frontend_parameters *p)
{
struct cx22700_state* state = (struct cx22700_state*) fe->demodulator_priv;
cx22700_writereg (state, 0x00, 0x02); /* XXX CHECKME: soft reset*/
cx22700_writereg (state, 0x00, 0x00);
cx22700_writereg (state, 0x0a, 0x00); /* open i2c bus switch */
state->config->pll_set(fe, p);
cx22700_writereg (state, 0x0a, 0x01); /* close i2c bus switch */
cx22700_set_inversion (state, p->inversion);
cx22700_set_tps (state, &p->u.ofdm);
cx22700_writereg (state, 0x37, 0x01); /* PAL loop filter off */
cx22700_writereg (state, 0x00, 0x01); /* restart acquire */
return 0;
}
static int cx22700_get_frontend(struct dvb_frontend* fe, struct dvb_frontend_parameters *p)
{
struct cx22700_state* state = (struct cx22700_state*) fe->demodulator_priv;
u8 reg09 = cx22700_readreg (state, 0x09);
p->inversion = reg09 & 0x1 ? INVERSION_ON : INVERSION_OFF;
return cx22700_get_tps (state, &p->u.ofdm);
}
static int cx22700_get_tune_settings(struct dvb_frontend* fe, struct dvb_frontend_tune_settings* fesettings)
{
fesettings->min_delay_ms = 150;
fesettings->step_size = 166667;
fesettings->max_drift = 166667*2;
return 0;
}
static void cx22700_release(struct dvb_frontend* fe)
{
struct cx22700_state* state = (struct cx22700_state*) fe->demodulator_priv;
kfree(state);
}
static struct dvb_frontend_ops cx22700_ops;
struct dvb_frontend* cx22700_attach(const struct cx22700_config* config,
struct i2c_adapter* i2c)
{
struct cx22700_state* state = NULL;
/* allocate memory for the internal state */
state = (struct cx22700_state*) kmalloc(sizeof(struct cx22700_state), GFP_KERNEL);
if (state == NULL) goto error;
/* setup the state */
state->config = config;
state->i2c = i2c;
memcpy(&state->ops, &cx22700_ops, sizeof(struct dvb_frontend_ops));
/* check if the demod is there */
if (cx22700_readreg(state, 0x07) < 0) goto error;
/* 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 cx22700_ops = {
.info = {
.name = "Conexant CX22700 DVB-T",
.type = FE_OFDM,
.frequency_min = 470000000,
.frequency_max = 860000000,
.frequency_stepsize = 166667,
.caps = FE_CAN_FEC_1_2 | FE_CAN_FEC_2_3 | FE_CAN_FEC_3_4 |
FE_CAN_FEC_5_6 | FE_CAN_FEC_7_8 | FE_CAN_FEC_AUTO |
FE_CAN_QPSK | FE_CAN_QAM_16 | FE_CAN_QAM_64 |
FE_CAN_RECOVER
},
.release = cx22700_release,
.init = cx22700_init,
.set_frontend = cx22700_set_frontend,
.get_frontend = cx22700_get_frontend,
.get_tune_settings = cx22700_get_tune_settings,
.read_status = cx22700_read_status,
.read_ber = cx22700_read_ber,
.read_signal_strength = cx22700_read_signal_strength,
.read_snr = cx22700_read_snr,
.read_ucblocks = cx22700_read_ucblocks,
};
module_param(debug, int, 0644);
MODULE_PARM_DESC(debug, "Turn on/off frontend debugging (default:off).");
MODULE_DESCRIPTION("Conexant CX22700 DVB-T Demodulator driver");
MODULE_AUTHOR("Holger Waechtler");
MODULE_LICENSE("GPL");
EXPORT_SYMBOL(cx22700_attach);
