sys/dev/ic/tea5757.c

   1 /* $NetBSD: tea5757.c,v 1.2.6.4 2005/11/10 14:04:15 skrll Exp $ */
   2 /*      $OpenBSD: tea5757.c,v 1.3 2002/01/07 18:32:19 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 TEA5757 routines */
  30
  31 /*
  32  * Philips TEA5757H Self Tuned Radio
  33  *         http://www.semiconductors.philips.com/pip/TEA5757H
  34  *
  35  * The TEA5757; TEA5759 is a 44-pin integrated AM/FM stereo radio circuit.
  36  * The radio part is based on the TEA5712.
  37  *
  38  * The TEA5757 is used in FM-standards in which the local oscillator
  39  * frequency is above the radio frequency (e.g. European and American
  40  * standards). The TEA5759 is the version in which the oscillator frequency
  41  * is below the radio frequency (e.g. Japanese standard).
  42  *
  43  * The TEA5757; TEA5759 radio has a bus which consists of three wires:
  44  * BUS-CLOCK: software driven clock input
  45  * DATA: data input/output
  46  * WRITE-ENABLE: write/read input
  47  *
  48  * The TEA5757; TEA5759 has a 25-bit shift register.
  49  *
  50  * The chips are used in Radiotrack II, Guillemot Maxi Radio FM 2000,
  51  * Gemtek PCI cards and most Mediaforte FM tuners and sound cards with
  52  * integrated FM tuners.
  53  */
  54
  55 #include <sys/cdefs.h>
  56 __KERNEL_RCSID(0, "$NetBSD: tea5757.c,v 1.2.6.4 2005/11/10 14:04:15 skrll Exp $");
  57
  58 #include <sys/param.h>
  59 #include <sys/radioio.h>
  60
  61 #include <dev/ic/tea5757.h>
  62
  63 /*
  64  * Convert frequency to hardware representation
  65  */
  66 u_int32_t
  67 tea5757_encode_freq(u_int32_t freq, int tea5759)
  68 {
  69         if (tea5759)
  70                 freq -= IF_FREQ;
  71         else
  72                 freq += IF_FREQ;
  73
  74         /*
  75          * NO FLOATING POINT!
  76          */
  77         freq *= 10;
  78         freq /= 125;
  79
  80         return freq & TEA5757_FREQ;
  81 }
  82
  83 /*
  84  * Convert frequency from hardware representation
  85  */
  86 u_int32_t
  87 tea5757_decode_freq(u_int32_t freq, int tea5759)
  88 {
  89         freq &= TEA5757_FREQ;
  90         freq *= 125; /* 12.5 kHz */
  91         freq /= 10;
  92
  93         if (tea5759)
  94                 freq += IF_FREQ;
  95         else
  96                 freq -= IF_FREQ;
  97
  98         return freq;
  99 }
 100
 101 /*
 102  * Hardware search
 103  */
 104 void
 105 tea5757_search(struct tea5757_t *tea, u_int32_t stereo, u_int32_t lock, int dir)
 106 {
 107         u_int32_t reg;
 108         u_int co = 0;
 109
 110         reg = stereo | lock | TEA5757_SEARCH_START;
 111         reg |= dir ? TEA5757_SEARCH_UP : TEA5757_SEARCH_DOWN;
 112         tea5757_hardware_write(tea, reg);
 113
 114         DELAY(TEA5757_ACQUISITION_DELAY);
 115
 116         do {
 117                 DELAY(TEA5757_WAIT_DELAY);
 118                 reg = tea->read(tea->iot, tea->ioh, tea->offset);
 119         } while ((reg & TEA5757_FREQ) == 0 && ++co < 200);
 120 }
 121
 122 void
 123 tea5757_hardware_write(struct tea5757_t *tea, u_int32_t data)
 124 {
 125         int i = TEA5757_REGISTER_LENGTH;
 126
 127         tea->init(tea->iot, tea->ioh, tea->offset, 0);
 128
 129         while (i--)
 130                 if (data & (1 << i))
 131                         tea->write_bit(tea->iot, tea->ioh, tea->offset, 1);
 132                 else
 133                         tea->write_bit(tea->iot, tea->ioh, tea->offset, 0);
 134
 135         tea->rset(tea->iot, tea->ioh, tea->offset, 0);
 136 }
 137
 138 u_int32_t
 139 tea5757_set_freq(struct tea5757_t *tea, u_int32_t stereo, u_int32_t lock, u_int32_t freq)
 140 {
 141         u_int32_t data = 0ul;
 142
 143         if (freq < MIN_FM_FREQ)
 144                 freq = MIN_FM_FREQ;
 145         if (freq > MAX_FM_FREQ)
 146                 freq = MAX_FM_FREQ;
 147
 148         data |= tea5757_encode_freq(freq, tea->flags & TEA5757_TEA5759);
 149         data |= stereo | lock | TEA5757_SEARCH_END;
 150         tea5757_hardware_write(tea, data);
 151
 152         return freq;
 153 }
 154
 155 u_int32_t
 156 tea5757_encode_lock(u_int8_t lock)
 157 {
 158         if (lock < 8)
 159                 return TEA5757_S005;
 160         if (lock < 15)
 161                 return TEA5757_S010;
 162         if (lock < 51)
 163                 return TEA5757_S030;
 164         return TEA5757_S150;
 165 }
 166
 167 u_int8_t
 168 tea5757_decode_lock(u_int32_t lock)
 169 {
 170         switch (lock) {
 171         case TEA5757_S005:
 172                 return 5;
 173         case TEA5757_S010:
 174                 return 10;
 175                 break;
 176         case TEA5757_S030:
 177                 return 30;
 178         case TEA5757_S150:
 179         default:
 180                 return 150;
 181         }
 182 }