1e3d8abe6d
In this case, we will be sure that there exists a carrier and the center frequency would be simply f1 - f2. In such a circumstance, the TR loop is simplified to doing a simple check for timing, rather than searching for the same. Signed-off-by: Arvo Jarve <arvo@softshark.ee> Signed-off-by: Manu Abraham <manu@linuxtv.org> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
239 lines
6.1 KiB
C
239 lines
6.1 KiB
C
/*
|
|
TDA8261 8PSK/QPSK tuner driver
|
|
Copyright (C) Manu Abraham (abraham.manu@gmail.com)
|
|
|
|
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 "dvb_frontend.h"
|
|
#include "tda8261.h"
|
|
|
|
struct tda8261_state {
|
|
struct dvb_frontend *fe;
|
|
struct i2c_adapter *i2c;
|
|
const struct tda8261_config *config;
|
|
|
|
/* state cache */
|
|
u32 frequency;
|
|
u32 bandwidth;
|
|
};
|
|
|
|
static int tda8261_read(struct tda8261_state *state, u8 *buf)
|
|
{
|
|
struct dvb_frontend *fe = state->fe;
|
|
const struct tda8261_config *config = state->config;
|
|
int err = 0;
|
|
struct i2c_msg msg = { .addr = config->addr, .flags = I2C_M_RD,.buf = buf, .len = 2 };
|
|
|
|
if (fe->ops.i2c_gate_ctrl)
|
|
fe->ops.i2c_gate_ctrl(fe, 1);
|
|
|
|
if ((err = i2c_transfer(state->i2c, &msg, 1)) != 1)
|
|
printk("%s: read error, err=%d\n", __func__, err);
|
|
|
|
return err;
|
|
}
|
|
|
|
static int tda8261_write(struct tda8261_state *state, u8 *buf)
|
|
{
|
|
struct dvb_frontend *fe = state->fe;
|
|
const struct tda8261_config *config = state->config;
|
|
int err = 0;
|
|
struct i2c_msg msg = { .addr = config->addr, .flags = 0, .buf = buf, .len = 4 };
|
|
|
|
if (fe->ops.i2c_gate_ctrl)
|
|
fe->ops.i2c_gate_ctrl(fe, 1);
|
|
|
|
if ((err = i2c_transfer(state->i2c, &msg, 1)) != 1)
|
|
printk("%s: write error, err=%d\n", __func__, err);
|
|
|
|
return err;
|
|
}
|
|
|
|
static int tda8261_get_status(struct dvb_frontend *fe, u32 *status)
|
|
{
|
|
struct tda8261_state *state = fe->tuner_priv;
|
|
u8 result = 0;
|
|
int err = 0;
|
|
|
|
*status = 0;
|
|
|
|
if ((err = tda8261_read(state, &result)) < 0) {
|
|
printk("%s: I/O Error\n", __func__);
|
|
return err;
|
|
}
|
|
if ((result >> 6) & 0x01) {
|
|
printk("%s: Tuner Phase Locked\n", __func__);
|
|
*status = 1;
|
|
}
|
|
|
|
return err;
|
|
}
|
|
|
|
static const u32 div_tab[] = { 2000, 1000, 500, 250, 125 }; /* kHz */
|
|
static const u8 ref_div[] = { 0x00, 0x01, 0x02, 0x05, 0x07 };
|
|
|
|
static int tda8261_get_state(struct dvb_frontend *fe,
|
|
enum tuner_param param,
|
|
struct tuner_state *tstate)
|
|
{
|
|
struct tda8261_state *state = fe->tuner_priv;
|
|
int err = 0;
|
|
|
|
switch (param) {
|
|
case DVBFE_TUNER_FREQUENCY:
|
|
tstate->frequency = state->frequency;
|
|
break;
|
|
case DVBFE_TUNER_BANDWIDTH:
|
|
tstate->bandwidth = 40000000; /* FIXME! need to calculate Bandwidth */
|
|
break;
|
|
default:
|
|
printk("%s: Unknown parameter (param=%d)\n", __func__, param);
|
|
err = -EINVAL;
|
|
break;
|
|
}
|
|
|
|
return err;
|
|
}
|
|
|
|
static int tda8261_set_state(struct dvb_frontend *fe,
|
|
enum tuner_param param,
|
|
struct tuner_state *tstate)
|
|
{
|
|
struct tda8261_state *state = fe->tuner_priv;
|
|
const struct tda8261_config *config = state->config;
|
|
u32 frequency, N, status = 0;
|
|
u8 buf[4];
|
|
int err = 0;
|
|
|
|
if (param & DVBFE_TUNER_FREQUENCY) {
|
|
/**
|
|
* N = Max VCO Frequency / Channel Spacing
|
|
* Max VCO Frequency = VCO frequency + (channel spacing - 1)
|
|
* (to account for half channel spacing on either side)
|
|
*/
|
|
frequency = tstate->frequency;
|
|
if ((frequency < 950000) || (frequency > 2150000)) {
|
|
printk("%s: Frequency beyond limits, frequency=%d\n", __func__, frequency);
|
|
return -EINVAL;
|
|
}
|
|
N = (frequency + (div_tab[config->step_size] - 1)) / div_tab[config->step_size];
|
|
printk("%s: Step size=%d, Divider=%d, PG=0x%02x (%d)\n",
|
|
__func__, config->step_size, div_tab[config->step_size], N, N);
|
|
|
|
buf[0] = (N >> 8) & 0xff;
|
|
buf[1] = N & 0xff;
|
|
buf[2] = (0x01 << 7) | ((ref_div[config->step_size] & 0x07) << 1);
|
|
|
|
if (frequency < 1450000)
|
|
buf[3] = 0x00;
|
|
if (frequency < 2000000)
|
|
buf[3] = 0x40;
|
|
if (frequency < 2150000)
|
|
buf[3] = 0x80;
|
|
|
|
/* Set params */
|
|
if ((err = tda8261_write(state, buf)) < 0) {
|
|
printk("%s: I/O Error\n", __func__);
|
|
return err;
|
|
}
|
|
/* sleep for some time */
|
|
printk("%s: Waiting to Phase LOCK\n", __func__);
|
|
msleep(20);
|
|
/* check status */
|
|
if ((err = tda8261_get_status(fe, &status)) < 0) {
|
|
printk("%s: I/O Error\n", __func__);
|
|
return err;
|
|
}
|
|
if (status == 1) {
|
|
printk("%s: Tuner Phase locked: status=%d\n", __func__, status);
|
|
state->frequency = frequency; /* cache successful state */
|
|
} else {
|
|
printk("%s: No Phase lock: status=%d\n", __func__, status);
|
|
}
|
|
} else {
|
|
printk("%s: Unknown parameter (param=%d)\n", __func__, param);
|
|
return -EINVAL;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int tda8261_release(struct dvb_frontend *fe)
|
|
{
|
|
struct tda8261_state *state = fe->tuner_priv;
|
|
|
|
fe->tuner_priv = NULL;
|
|
kfree(state);
|
|
return 0;
|
|
}
|
|
|
|
static struct dvb_tuner_ops tda8261_ops = {
|
|
|
|
.info = {
|
|
.name = "TDA8261",
|
|
// .tuner_name = NULL,
|
|
.frequency_min = 950000,
|
|
.frequency_max = 2150000,
|
|
.frequency_step = 0
|
|
},
|
|
|
|
.set_state = tda8261_set_state,
|
|
.get_state = tda8261_get_state,
|
|
.get_status = tda8261_get_status,
|
|
.release = tda8261_release
|
|
};
|
|
|
|
struct dvb_frontend *tda8261_attach(struct dvb_frontend *fe,
|
|
const struct tda8261_config *config,
|
|
struct i2c_adapter *i2c)
|
|
{
|
|
struct tda8261_state *state = NULL;
|
|
|
|
if ((state = kzalloc(sizeof (struct tda8261_state), GFP_KERNEL)) == NULL)
|
|
goto exit;
|
|
|
|
state->config = config;
|
|
state->i2c = i2c;
|
|
state->fe = fe;
|
|
fe->tuner_priv = state;
|
|
fe->ops.tuner_ops = tda8261_ops;
|
|
|
|
fe->ops.tuner_ops.info.frequency_step = div_tab[config->step_size];
|
|
// fe->ops.tuner_ops.tuner_name = &config->buf;
|
|
|
|
// printk("%s: Attaching %s TDA8261 8PSK/QPSK tuner\n",
|
|
// __func__, fe->ops.tuner_ops.tuner_name);
|
|
printk("%s: Attaching TDA8261 8PSK/QPSK tuner\n", __func__);
|
|
|
|
return fe;
|
|
|
|
exit:
|
|
kfree(state);
|
|
return NULL;
|
|
}
|
|
|
|
EXPORT_SYMBOL(tda8261_attach);
|
|
MODULE_PARM_DESC(verbose, "Set verbosity level");
|
|
|
|
MODULE_AUTHOR("Manu Abraham");
|
|
MODULE_DESCRIPTION("TDA8261 8PSK/QPSK Tuner");
|
|
MODULE_LICENSE("GPL");
|