The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/dev/ic/tea5757.c

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    1 /* $NetBSD: tea5757.c,v 1.5 2005/12/11 12:21:28 christos 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 1.5 2005/12/11 12:21:28 christos 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 }

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