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/* $OpenBSD: tea5757.c,v 1.4 2021/11/23 00:17:59 jsg Exp $ */
/*
* Copyright (c) 2001 Vladimir Popov <jumbo@narod.ru>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/* Implementation of most common TEA5757 routines */
/*
* Philips TEA5757H Self Tuned Radio
* http://www.semiconductors.philips.com/pip/TEA5757H
*
* The TEA5757; TEA5759 is a 44-pin integrated AM/FM stereo radio circuit.
* The radio part is based on the TEA5712.
*
* The TEA5757 is used in FM-standards in which the local oscillator
* frequency is above the radio frequency (e.g. European and American
* standards). The TEA5759 is the version in which the oscillator frequency
* is below the radio frequency (e.g. Japanese standard).
*
* The TEA5757; TEA5759 radio has a bus which consists of three wires:
* BUS-CLOCK: software driven clock input
* DATA: data input/output
* WRITE-ENABLE: write/read input
*
* The TEA5757; TEA5759 has a 25-bit shift register.
*
* The chips are used in Radiotrack II, Guillemot Maxi Radio FM 2000,
* Gemtek PCI cards and most Mediaforte FM tuners and sound cards with
* integrated FM tuners.
*/
#include <sys/param.h>
#include <sys/radioio.h>
#include <dev/ic/tea5757.h>
/*
* Convert frequency to hardware representation
*/
u_int32_t
tea5757_encode_freq(u_int32_t freq, int tea5759)
{
if (tea5759)
freq -= IF_FREQ;
else
freq += IF_FREQ;
/*
* NO FLOATING POINT!
*/
freq *= 10;
freq /= 125;
return freq & TEA5757_FREQ;
}
/*
* Convert frequency from hardware representation
*/
u_int32_t
tea5757_decode_freq(u_int32_t freq, int tea5759)
{
freq &= TEA5757_FREQ;
freq *= 125; /* 12.5 kHz */
freq /= 10;
if (tea5759)
freq += IF_FREQ;
else
freq -= IF_FREQ;
return freq;
}
/*
* Hardware search
*/
void
tea5757_search(struct tea5757_t *tea, u_int32_t stereo, u_int32_t lock, int dir)
{
u_int32_t reg;
u_int co = 0;
reg = stereo | lock | TEA5757_SEARCH_START;
reg |= dir ? TEA5757_SEARCH_UP : TEA5757_SEARCH_DOWN;
tea5757_hardware_write(tea, reg);
DELAY(TEA5757_ACQUISITION_DELAY);
do {
DELAY(TEA5757_WAIT_DELAY);
reg = tea->read(tea->iot, tea->ioh, tea->offset);
} while ((reg & TEA5757_FREQ) == 0 && ++co < 200);
}
void
tea5757_hardware_write(struct tea5757_t *tea, u_int32_t data)
{
int i = TEA5757_REGISTER_LENGTH;
tea->init(tea->iot, tea->ioh, tea->offset, 0);
while (i--)
if (data & (1 << i))
tea->write_bit(tea->iot, tea->ioh, tea->offset, 1);
else
tea->write_bit(tea->iot, tea->ioh, tea->offset, 0);
tea->rset(tea->iot, tea->ioh, tea->offset, 0);
}
u_int32_t
tea5757_set_freq(struct tea5757_t *tea, u_int32_t stereo, u_int32_t lock, u_int32_t freq)
{
u_int32_t data = 0ul;
if (freq < MIN_FM_FREQ)
freq = MIN_FM_FREQ;
if (freq > MAX_FM_FREQ)
freq = MAX_FM_FREQ;
data |= tea5757_encode_freq(freq, tea->flags & TEA5757_TEA5759);
data |= stereo | lock | TEA5757_SEARCH_END;
tea5757_hardware_write(tea, data);
return freq;
}
u_int32_t
tea5757_encode_lock(u_int8_t lock)
{
u_int32_t ret;
if (lock < 8)
ret = TEA5757_S005;
else if (lock > 7 && lock < 15)
ret = TEA5757_S010;
else if (lock > 14 && lock < 51)
ret = TEA5757_S030;
else
ret = TEA5757_S150;
return ret;
}
u_int8_t
tea5757_decode_lock(u_int32_t lock)
{
u_int8_t ret = 150;
switch (lock) {
case TEA5757_S005:
ret = 5;
break;
case TEA5757_S010:
ret = 10;
break;
case TEA5757_S030:
ret = 30;
break;
case TEA5757_S150:
ret = 150;
break;
}
return ret;
}
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