sys/dev/ic/lm700x.c

   1 /* $NetBSD: lm700x.c,v 1.1.20.3 2004/09/21 13:28:04 skrll Exp $ */
   2 /*      $OpenBSD: lm700x.c,v 1.2 2001/12/06 16:28:18 mickey Exp $       */
   3
   4 /*
   5  * Copyright (c) 2001 Vladimir Popov <jumbo@narod.ru>
   6  * All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  18  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  19  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  21  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  22  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
  23  * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
  24  * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
  25  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
  26  * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27  */
  28
  29 /* Implementation of most common lm700x routines */
  30
  31 /*
  32  * Sanyo LM7001 Direct PLL Frequency Synthesizer
  33  *    ??? See http://www.redsword.com/tjacobs/geeb/fmcard.htm
  34  *
  35  * The LM7001J and LM7001JM (used in Aztech/PackardBell cards) are PLL
  36  * frequency synthesizer LSIs for tuners. These LSIs are software compatible
  37  * with LM7000 (used in Radiotrack, Radioreveal RA300, some Mediaforte cards),
  38  * but do not include an IF calculation circuit.
  39  *
  40  * The FM VCO circuit includes a high-speed programmable divider that can
  41  * divide directly.
  42  *
  43  * Features:
  44  * Seven reference frequencies: 1, 5, 9, 10, 25, 50, and 100 kHz;
  45  * Band-switching outputs (3 bits);
  46  * Controller clock output (400 kHz);
  47  * Serial input circuit for data input (using the CE, CL and DATA pins).
  48  *
  49  * The LM7001J and LM7001JM have a 24-bit shift register.
  50  */
  51
  52 #include <sys/cdefs.h>
  53 __KERNEL_RCSID(0, "$NetBSD: lm700x.c,v 1.1.20.3 2004/09/21 13:28:04 skrll Exp $");
  54
  55 #include <sys/param.h>
  56 #include <sys/radioio.h>
  57
  58 #include <dev/ic/lm700x.h>
  59
  60 u_int32_t
  61 lm700x_encode_freq(u_int32_t nfreq, u_int32_t rf)
  62 {
  63         nfreq += IF_FREQ;
  64         nfreq /= lm700x_decode_ref(rf);
  65         return nfreq;
  66 }
  67
  68 void
  69 lm700x_hardware_write(struct lm700x_t *lm, u_int32_t data, u_int32_t addon)
  70 {
  71         int i;
  72
  73         lm->init(lm->iot, lm->ioh, lm->offset, lm->rsetdata | addon);
  74
  75         for (i = 0; i < LM700X_REGISTER_LENGTH; i++)
  76                 if (data & (1 << i)) {
  77                         bus_space_write_1(lm->iot, lm->ioh, lm->offset,
  78                                         lm->wocl | addon);
  79                         DELAY(LM700X_WRITE_DELAY);
  80                         bus_space_write_1(lm->iot, lm->ioh, lm->offset,
  81                                         lm->woch | addon);
  82                         DELAY(LM700X_WRITE_DELAY);
  83                         bus_space_write_1(lm->iot, lm->ioh, lm->offset,
  84                                         lm->wocl | addon);
  85                 } else {
  86                         bus_space_write_1(lm->iot, lm->ioh, lm->offset,
  87                                         lm->wzcl | addon);
  88                         DELAY(LM700X_WRITE_DELAY);
  89                         bus_space_write_1(lm->iot, lm->ioh, lm->offset,
  90                                         lm->wzch | addon);
  91                         DELAY(LM700X_WRITE_DELAY);
  92                         bus_space_write_1(lm->iot, lm->ioh, lm->offset,
  93                                         lm->wzcl | addon);
  94                 }
  95
  96         lm->rset(lm->iot, lm->ioh, lm->offset, lm->rsetdata | addon);
  97 }
  98
  99 u_int32_t
 100 lm700x_encode_ref(u_int8_t rf)
 101 {
 102         u_int32_t ret;
 103
 104         if (rf < 36)
 105                 ret = LM700X_REF_025;
 106         else if (rf > 35 && rf < 75)
 107                         ret = LM700X_REF_050;
 108         else
 109                 ret = LM700X_REF_100;
 110
 111         return ret;
 112 }
 113
 114 u_int8_t
 115 lm700x_decode_ref(u_int32_t rf)
 116 {
 117         u_int8_t ret;
 118
 119         switch (rf) {
 120         case LM700X_REF_100:
 121                 ret = 100;
 122                 break;
 123         case LM700X_REF_025:
 124                 ret = 25;
 125                 break;
 126         case LM700X_REF_050:
 127                 /* FALLTHROUGH */
 128         default:
 129                 ret = 50;
 130                 break;
 131         }
 132
 133         return ret;
 134 }