1/* $NetBSD: lm700x.c,v 1.1.20.3 2004/09/21 13:28:04 skrll Exp $ */
2/*	$OpenBSD: lm700x.c,v 1.2 2001/12/06 16:28:18 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 lm700x routines */
30
31/*
32 * Sanyo LM7001 Direct PLL Frequency Synthesizer
33 *    ??? See http://www.redsword.com/tjacobs/geeb/fmcard.htm
34 *
35 * The LM7001J and LM7001JM (used in Aztech/PackardBell cards) are PLL
36 * frequency synthesizer LSIs for tuners. These LSIs are software compatible
37 * with LM7000 (used in Radiotrack, Radioreveal RA300, some Mediaforte cards),
38 * but do not include an IF calculation circuit.
39 *
40 * The FM VCO circuit includes a high-speed programmable divider that can
41 * divide directly.
42 *
43 * Features:
44 * Seven reference frequencies: 1, 5, 9, 10, 25, 50, and 100 kHz;
45 * Band-switching outputs (3 bits);
46 * Controller clock output (400 kHz);
47 * Serial input circuit for data input (using the CE, CL and DATA pins).
48 *
49 * The LM7001J and LM7001JM have a 24-bit shift register.
50 */
51
52#include <sys/cdefs.h>
53__KERNEL_RCSID(0, "$NetBSD: lm700x.c,v 1.1.20.3 2004/09/21 13:28:04 skrll Exp $");
54
55#include <sys/param.h>
56#include <sys/radioio.h>
57
58#include <dev/ic/lm700x.h>
59
60u_int32_t
61lm700x_encode_freq(u_int32_t nfreq, u_int32_t rf)
62{
63	nfreq += IF_FREQ;
64	nfreq /= lm700x_decode_ref(rf);
65	return nfreq;
66}
67
68void
69lm700x_hardware_write(struct lm700x_t *lm, u_int32_t data, u_int32_t addon)
70{
71	int i;
72
73	lm->init(lm->iot, lm->ioh, lm->offset, lm->rsetdata | addon);
74
75	for (i = 0; i < LM700X_REGISTER_LENGTH; i++)
76		if (data & (1 << i)) {
77			bus_space_write_1(lm->iot, lm->ioh, lm->offset,
78					lm->wocl | addon);
79			DELAY(LM700X_WRITE_DELAY);
80			bus_space_write_1(lm->iot, lm->ioh, lm->offset,
81					lm->woch | addon);
82			DELAY(LM700X_WRITE_DELAY);
83			bus_space_write_1(lm->iot, lm->ioh, lm->offset,
84					lm->wocl | addon);
85		} else {
86			bus_space_write_1(lm->iot, lm->ioh, lm->offset,
87					lm->wzcl | addon);
88			DELAY(LM700X_WRITE_DELAY);
89			bus_space_write_1(lm->iot, lm->ioh, lm->offset,
90					lm->wzch | addon);
91			DELAY(LM700X_WRITE_DELAY);
92			bus_space_write_1(lm->iot, lm->ioh, lm->offset,
93					lm->wzcl | addon);
94		}
95
96	lm->rset(lm->iot, lm->ioh, lm->offset, lm->rsetdata | addon);
97}
98
99u_int32_t
100lm700x_encode_ref(u_int8_t rf)
101{
102	u_int32_t ret;
103
104	if (rf < 36)
105		ret = LM700X_REF_025;
106	else if (rf > 35 && rf < 75)
107			ret = LM700X_REF_050;
108	else
109		ret = LM700X_REF_100;
110
111	return ret;
112}
113
114u_int8_t
115lm700x_decode_ref(u_int32_t rf)
116{
117	u_int8_t ret;
118
119	switch (rf) {
120	case LM700X_REF_100:
121		ret = 100;
122		break;
123	case LM700X_REF_025:
124		ret = 25;
125		break;
126	case LM700X_REF_050:
127		/* FALLTHROUGH */
128	default:
129		ret = 50;
130		break;
131	}
132
133	return ret;
134}
135