1 /* $OpenBSD: tea5757.c,v 1.3 2002/01/07 18:32:19 mickey Exp $ */
2
3 /*
4 * Copyright (c) 2001 Vladimir Popov <jumbo@narod.ru>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
20 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
21 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
22 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
23 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
24 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
25 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 */
27
28 /* Implementation of most common TEA5757 routines */
29
30 /*
31 * Philips TEA5757H Self Tuned Radio
32 * http://www.semiconductors.philips.com/pip/TEA5757H
33 *
34 * The TEA5757; TEA5759 is a 44-pin integrated AM/FM stereo radio circuit.
35 * The radio part is based on the TEA5712.
36 *
37 * The TEA5757 is used in FM-standards in which the local oscillator
38 * frequency is above the radio frequency (e.g. European and American
39 * standards). The TEA5759 is the version in which the oscillator frequency
40 * is below the radio frequency (e.g. Japanese standard).
41 *
42 * The TEA5757; TEA5759 radio has a bus which consists of three wires:
43 * BUS-CLOCK: software driven clock input
44 * DATA: data input/output
45 * WRITE-ENABLE: write/read input
46 *
47 * The TEA5757; TEA5759 has a 25-bit shift register.
48 *
49 * The chips are used in Radiotrack II, Guillemot Maxi Radio FM 2000,
50 * Gemtek PCI cards and most Mediaforte FM tuners and sound cards with
51 * integrated FM tuners.
52 */
53
54 #include <sys/param.h>
55 #include <sys/radioio.h>
56
57 #include <dev/ic/tea5757.h>
58
59 /*
60 * Convert frequency to hardware representation
61 */
62 u_int32_t
63 tea5757_encode_freq(u_int32_t freq, int tea5759)
64 {
65 if (tea5759)
66 freq -= IF_FREQ;
67 else
68 freq += IF_FREQ;
69
70 /*
71 * NO FLOATING POINT!
72 */
73 freq *= 10;
74 freq /= 125;
75
76 return freq & TEA5757_FREQ;
77 }
78
79 /*
80 * Convert frequency from hardware representation
81 */
82 u_int32_t
83 tea5757_decode_freq(u_int32_t freq, int tea5759)
84 {
85 freq &= TEA5757_FREQ;
86 freq *= 125; /* 12.5 kHz */
87 freq /= 10;
88
89 if (tea5759)
90 freq += IF_FREQ;
91 else
92 freq -= IF_FREQ;
93
94 return freq;
95 }
96
97 /*
98 * Hardware search
99 */
100 void
101 tea5757_search(struct tea5757_t *tea, u_int32_t stereo, u_int32_t lock, int dir)
102 {
103 u_int32_t reg;
104 u_int co = 0;
105
106 reg = stereo | lock | TEA5757_SEARCH_START;
107 reg |= dir ? TEA5757_SEARCH_UP : TEA5757_SEARCH_DOWN;
108 tea5757_hardware_write(tea, reg);
109
110 DELAY(TEA5757_ACQUISITION_DELAY);
111
112 do {
113 DELAY(TEA5757_WAIT_DELAY);
114 reg = tea->read(tea->iot, tea->ioh, tea->offset);
115 } while ((reg & TEA5757_FREQ) == 0 && ++co < 200);
116 }
117
118 void
119 tea5757_hardware_write(struct tea5757_t *tea, u_int32_t data)
120 {
121 int i = TEA5757_REGISTER_LENGTH;
122
123 tea->init(tea->iot, tea->ioh, tea->offset, 0);
124
125 while (i--)
126 if (data & (1 << i))
127 tea->write_bit(tea->iot, tea->ioh, tea->offset, 1);
128 else
129 tea->write_bit(tea->iot, tea->ioh, tea->offset, 0);
130
131 tea->rset(tea->iot, tea->ioh, tea->offset, 0);
132 }
133
134 u_int32_t
135 tea5757_set_freq(struct tea5757_t *tea, u_int32_t stereo, u_int32_t lock, u_int32_t freq)
136 {
137 u_int32_t data = 0ul;
138
139 if (freq < MIN_FM_FREQ)
140 freq = MIN_FM_FREQ;
141 if (freq > MAX_FM_FREQ)
142 freq = MAX_FM_FREQ;
143
144 data |= tea5757_encode_freq(freq, tea->flags & TEA5757_TEA5759);
145 data |= stereo | lock | TEA5757_SEARCH_END;
146 tea5757_hardware_write(tea, data);
147
148 return freq;
149 }
150
151 u_int32_t
152 tea5757_encode_lock(u_int8_t lock)
153 {
154 u_int32_t ret;
155
156 if (lock < 8)
157 ret = TEA5757_S005;
158 else if (lock > 7 && lock < 15)
159 ret = TEA5757_S010;
160 else if (lock > 14 && lock < 51)
161 ret = TEA5757_S030;
162 else if (lock > 50)
163 ret = TEA5757_S150;
164
165 return ret;
166 }
167
168 u_int8_t
169 tea5757_decode_lock(u_int32_t lock)
170 {
171 u_int8_t ret = 150;
172
173 switch (lock) {
174 case TEA5757_S005:
175 ret = 5;
176 break;
177 case TEA5757_S010:
178 ret = 10;
179 break;
180 case TEA5757_S030:
181 ret = 30;
182 break;
183 case TEA5757_S150:
184 ret = 150;
185 break;
186 }
187
188 return ret;
189 }