1 /* $NetBSD: tea5757.c,v 1.2 2002/09/03 18:53:40 augustss 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/param.h> 56 #include <sys/radioio.h> 57 58 #include <dev/ic/tea5757.h> 59 60 /* 61 * Convert frequency to hardware representation 62 */ 63 u_int32_t 64 tea5757_encode_freq(u_int32_t freq, int tea5759) 65 { 66 if (tea5759) 67 freq -= IF_FREQ; 68 else 69 freq += IF_FREQ; 70 71 /* 72 * NO FLOATING POINT! 73 */ 74 freq *= 10; 75 freq /= 125; 76 77 return freq & TEA5757_FREQ; 78 } 79 80 /* 81 * Convert frequency from hardware representation 82 */ 83 u_int32_t 84 tea5757_decode_freq(u_int32_t freq, int tea5759) 85 { 86 freq &= TEA5757_FREQ; 87 freq *= 125; /* 12.5 kHz */ 88 freq /= 10; 89 90 if (tea5759) 91 freq += IF_FREQ; 92 else 93 freq -= IF_FREQ; 94 95 return freq; 96 } 97 98 /* 99 * Hardware search 100 */ 101 void 102 tea5757_search(struct tea5757_t *tea, u_int32_t stereo, u_int32_t lock, int dir) 103 { 104 u_int32_t reg; 105 u_int co = 0; 106 107 reg = stereo | lock | TEA5757_SEARCH_START; 108 reg |= dir ? TEA5757_SEARCH_UP : TEA5757_SEARCH_DOWN; 109 tea5757_hardware_write(tea, reg); 110 111 DELAY(TEA5757_ACQUISITION_DELAY); 112 113 do { 114 DELAY(TEA5757_WAIT_DELAY); 115 reg = tea->read(tea->iot, tea->ioh, tea->offset); 116 } while ((reg & TEA5757_FREQ) == 0 && ++co < 200); 117 } 118 119 void 120 tea5757_hardware_write(struct tea5757_t *tea, u_int32_t data) 121 { 122 int i = TEA5757_REGISTER_LENGTH; 123 124 tea->init(tea->iot, tea->ioh, tea->offset, 0); 125 126 while (i--) 127 if (data & (1 << i)) 128 tea->write_bit(tea->iot, tea->ioh, tea->offset, 1); 129 else 130 tea->write_bit(tea->iot, tea->ioh, tea->offset, 0); 131 132 tea->rset(tea->iot, tea->ioh, tea->offset, 0); 133 } 134 135 u_int32_t 136 tea5757_set_freq(struct tea5757_t *tea, u_int32_t stereo, u_int32_t lock, u_int32_t freq) 137 { 138 u_int32_t data = 0ul; 139 140 if (freq < MIN_FM_FREQ) 141 freq = MIN_FM_FREQ; 142 if (freq > MAX_FM_FREQ) 143 freq = MAX_FM_FREQ; 144 145 data |= tea5757_encode_freq(freq, tea->flags & TEA5757_TEA5759); 146 data |= stereo | lock | TEA5757_SEARCH_END; 147 tea5757_hardware_write(tea, data); 148 149 return freq; 150 } 151 152 u_int32_t 153 tea5757_encode_lock(u_int8_t lock) 154 { 155 u_int32_t ret; 156 157 if (lock < 8) 158 ret = TEA5757_S005; 159 else if (lock > 7 && lock < 15) 160 ret = TEA5757_S010; 161 else if (lock > 14 && lock < 51) 162 ret = TEA5757_S030; 163 else if (lock > 50) 164 ret = TEA5757_S150; 165 166 return ret; 167 } 168 169 u_int8_t 170 tea5757_decode_lock(u_int32_t lock) 171 { 172 u_int8_t ret = 150; 173 174 switch (lock) { 175 case TEA5757_S005: 176 ret = 5; 177 break; 178 case TEA5757_S010: 179 ret = 10; 180 break; 181 case TEA5757_S030: 182 ret = 30; 183 break; 184 case TEA5757_S150: 185 ret = 150; 186 break; 187 } 188 189 return ret; 190 } 191