Annotation of sys/dev/ic/tea5757.c, Revision 1.1.1.1
1.1 nbrk 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: }
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