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/* $OpenBSD: lm700x.c,v 1.3 2007/05/22 04:14:03 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 lm700x routines */
/*
* Sanyo LM7001 Direct PLL Frequency Synthesizer
*
* The LM7001J and LM7001JM (used in Aztech/PackardBell cards) are PLL
* frequency synthesizer LSIs for tuners. These LSIs are software compatible
* with LM7000 (used in Radiotrack, Radioreveal RA300, some Mediaforte cards),
* but do not include an IF calculation circuit.
*
* The FM VCO circuit includes a high-speed programmable divider that can
* divide directly.
*
* Features:
* Seven reference frequencies: 1, 5, 9, 10, 25, 50, and 100 kHz;
* Band-switching outputs (3 bits);
* Controller clock output (400 kHz);
* Serial input circuit for data input (using the CE, CL and DATA pins).
*
* The LM7001J and LM7001JM have a 24-bit shift register.
*/
#include <sys/param.h>
#include <sys/radioio.h>
#include <dev/ic/lm700x.h>
u_int32_t
lm700x_encode_freq(u_int32_t nfreq, u_int32_t rf)
{
nfreq += IF_FREQ;
nfreq /= lm700x_decode_ref(rf);
return nfreq;
}
void
lm700x_hardware_write(struct lm700x_t *lm, u_int32_t data, u_int32_t addon)
{
int i;
lm->init(lm->iot, lm->ioh, lm->offset, lm->rsetdata | addon);
for (i = 0; i < LM700X_REGISTER_LENGTH; i++)
if (data & (1 << i)) {
bus_space_write_1(lm->iot, lm->ioh, lm->offset,
lm->wocl | addon);
DELAY(LM700X_WRITE_DELAY);
bus_space_write_1(lm->iot, lm->ioh, lm->offset,
lm->woch | addon);
DELAY(LM700X_WRITE_DELAY);
bus_space_write_1(lm->iot, lm->ioh, lm->offset,
lm->wocl | addon);
} else {
bus_space_write_1(lm->iot, lm->ioh, lm->offset,
lm->wzcl | addon);
DELAY(LM700X_WRITE_DELAY);
bus_space_write_1(lm->iot, lm->ioh, lm->offset,
lm->wzch | addon);
DELAY(LM700X_WRITE_DELAY);
bus_space_write_1(lm->iot, lm->ioh, lm->offset,
lm->wzcl | addon);
}
lm->rset(lm->iot, lm->ioh, lm->offset, lm->rsetdata | addon);
}
u_int32_t
lm700x_encode_ref(u_int8_t rf)
{
u_int32_t ret;
if (rf < 36)
ret = LM700X_REF_025;
else if (rf > 35 && rf < 75)
ret = LM700X_REF_050;
else
ret = LM700X_REF_100;
return ret;
}
u_int8_t
lm700x_decode_ref(u_int32_t rf)
{
u_int8_t ret;
switch (rf) {
case LM700X_REF_100:
ret = 100;
break;
case LM700X_REF_025:
ret = 25;
break;
case LM700X_REF_050:
/* FALLTHROUGH */
default:
ret = 50;
break;
}
return ret;
}
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