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      1 /* $NetBSD: lm700x.c,v 1.3 2005/12/11 12:21:27 christos 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 (at) 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 1.3 2005/12/11 12:21:27 christos Exp $");
     54 
     55 #include <sys/param.h>
     56 #include <sys/radioio.h>
     57 
     58 #include <dev/ic/lm700x.h>
     59 
     60 u_int32_t
     61 lm700x_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 
     68 void
     69 lm700x_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 
     99 u_int32_t
    100 lm700x_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 
    114 u_int8_t
    115 lm700x_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