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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
* Tuner "middleware" for Philips TEA5760UK chip
*
* Copyright (C) 2004 Jörg Hohensohn
*
* 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 software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/
#include "config.h"
#include <stdbool.h>
#include <string.h>
#include <stdlib.h>
#include "kernel.h"
#include "tuner.h" /* tuner abstraction interface */
#include "fmradio.h"
#include "fmradio_i2c.h" /* physical interface driver */
#define I2C_ADR 0x22
static bool tuner_present = false;
static unsigned char write_bytes[7] = {
0x00, /* INTREG LSB */
0x80, /* FRQSET MSB */
0x00, /* FRQSET LSB */
0x08, /* TNCTRL MSB */
0xD2, /* TNCTRL LSB */
0x00, /* TESTREG MSB */
0x40 /* TESTREG LSB */
};
static void tea5760_set_clear(int byte, unsigned char bits, int set)
{
write_bytes[byte] &= ~bits;
if (set)
write_bytes[byte] |= bits;
}
/* tuner abstraction layer: set something to the tuner */
int tea5760_set(int setting, int value)
{
switch(setting)
{
case RADIO_SLEEP:
if (value) {
/* sleep / standby mode */
tea5760_set_clear(3, (1<<6), 0);
}
else {
/* active mode */
tea5760_set_clear(3, (1<<6), 1);
/* disable hard mute */
tea5760_set_clear(4, (1<<7), 0);
}
break;
case RADIO_FREQUENCY:
{
int n;
/* low side injection */
tea5760_set_clear(4, (1<<4), 0);
n = (4 * (value - 225000) + 16384) / 32768;
/* set frequency in preset mode */
write_bytes[1] = (n >> 8) & 0x3F;
write_bytes[2] = n;
}
break;
case RADIO_SCAN_FREQUENCY:
tea5760_set(RADIO_FREQUENCY, value);
sleep(40*HZ/1000);
return tea5760_get(RADIO_TUNED);
case RADIO_MUTE:
tea5760_set_clear(3, (1<<2), value);
break;
case RADIO_REGION:
{
const struct fm_region_data *rd = &fm_region_data[value];
int band = (rd->freq_min == 76000000) ? 1 : 0;
int deemphasis = (rd->deemphasis == 50) ? 1 : 0;
tea5760_set_clear(3, (1<<5), band);
tea5760_set_clear(4, (1<<1), deemphasis);
}
break;
case RADIO_FORCE_MONO:
tea5760_set_clear(4, (1<<3), value);
break;
default:
return -1;
}
fmradio_i2c_write(I2C_ADR, write_bytes, sizeof(write_bytes));
return 1;
}
/* tuner abstraction layer: read something from the tuner */
int tea5760_get(int setting)
{
unsigned char read_bytes[16];
int val = -1; /* default for unsupported query */
fmradio_i2c_read(I2C_ADR, read_bytes, sizeof(read_bytes));
switch(setting)
{
case RADIO_PRESENT:
val = tuner_present ? 1 : 0;
break;
case RADIO_TUNED:
val = 0;
if (read_bytes[0] & (1<<4)) /* IF count correct */
{
val = read_bytes[8] >> 1; /* IF counter */
val = (abs(val - 0x36) < 2); /* close match */
}
break;
case RADIO_STEREO:
val = read_bytes[9] >> 2;
break;
}
return val;
}
void tea5760_init(void)
{
unsigned char buf[16];
unsigned short manid, chipid;
/* read all registers */
fmradio_i2c_read(I2C_ADR, buf, sizeof(buf));
/* check device id */
manid = (buf[12] << 8) | buf[13];
chipid = (buf[14] << 8) | buf[15];
if ((manid == 0x202B) && (chipid == 0x5760))
{
tuner_present = true;
}
/* write initial values */
tea5760_set_clear(3, (1<<1), 1); /* soft mute on */
tea5760_set_clear(3, (1<<0), 1); /* stereo noise cancellation on */
fmradio_i2c_write(I2C_ADR, write_bytes, sizeof(write_bytes));
}
void tea5760_dbg_info(struct tea5760_dbg_info *info)
{
fmradio_i2c_read(I2C_ADR, info->read_regs, sizeof(info->read_regs));
memcpy(info->write_regs, write_bytes, sizeof(info->write_regs));
}
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