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/* $OpenBSD: tea5757.c,v 1.1 2001/10/04 19:46:46 gluk 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 */
#include <sys/param.h>
#include <sys/radioio.h>
#include <dev/ic/tea5757.h>
/*
* Convert frequency to hardware representation
*/
u_long
tea5757_encode_freq(u_long freq)
{
#ifdef RADIO_TEA5759
freq -= IF_FREQ;
#else
freq += IF_FREQ;
#endif /* RADIO_TEA5759 */
/*
* NO FLOATING POINT!
*/
freq *= 10;
freq /= 125;
return freq & TEA5757_FREQ;
}
/*
* Convert frequency from hardware representation
*/
u_long
tea5757_decode_freq(u_long freq)
{
freq &= TEA5757_FREQ;
freq *= 125; /* 12.5 kHz */
freq /= 10;
#ifdef RADIO_TEA5759
freq += IF_FREQ;
#else
freq -= IF_FREQ;
#endif /* RADIO_TEA5759 */
return freq;
}
/*
* Hardware search
*/
void
tea5757_search(struct tea5757_t *tea, u_long stereo, u_long lock, int dir)
{
u_long 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_long 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_long
tea5757_set_freq(struct tea5757_t *tea, u_long stereo, u_long lock, u_long freq)
{
u_long 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) | stereo | lock | TEA5757_SEARCH_END;
tea5757_hardware_write(tea, data);
return freq;
}
u_long
tea5757_encode_lock(u_char lock)
{
u_long 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 if (lock > 50)
ret = TEA5757_S150;
return ret;
}
u_char
tea5757_decode_lock(u_long lock)
{
u_char ret;
switch (lock) {
case TEA5757_S005:
ret = 5;
break;
case TEA5757_S010:
ret = 10;
break;
case TEA5757_S030:
ret = 30;
break;
case TEA5757_S150:
/* FALLTHROUGH */
default:
ret = 150;
break;
}
return ret;
}
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