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Annotation of sys/dev/ic/lm700x.c, Revision 1.1.1.1

1.1       nbrk        1: /*     $OpenBSD: lm700x.c,v 1.3 2007/05/22 04:14:03 jsg 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 lm700x routines */
                     29:
                     30: /*
                     31:  * Sanyo LM7001 Direct PLL Frequency Synthesizer
                     32:  *
                     33:  * The LM7001J and LM7001JM (used in Aztech/PackardBell cards) are PLL
                     34:  * frequency synthesizer LSIs for tuners. These LSIs are software compatible
                     35:  * with LM7000 (used in Radiotrack, Radioreveal RA300, some Mediaforte cards),
                     36:  * but do not include an IF calculation circuit.
                     37:  *
                     38:  * The FM VCO circuit includes a high-speed programmable divider that can
                     39:  * divide directly.
                     40:  *
                     41:  * Features:
                     42:  * Seven reference frequencies: 1, 5, 9, 10, 25, 50, and 100 kHz;
                     43:  * Band-switching outputs (3 bits);
                     44:  * Controller clock output (400 kHz);
                     45:  * Serial input circuit for data input (using the CE, CL and DATA pins).
                     46:  *
                     47:  * The LM7001J and LM7001JM have a 24-bit shift register.
                     48:  */
                     49:
                     50: #include <sys/param.h>
                     51: #include <sys/radioio.h>
                     52:
                     53: #include <dev/ic/lm700x.h>
                     54:
                     55: u_int32_t
                     56: lm700x_encode_freq(u_int32_t nfreq, u_int32_t rf)
                     57: {
                     58:        nfreq += IF_FREQ;
                     59:        nfreq /= lm700x_decode_ref(rf);
                     60:        return nfreq;
                     61: }
                     62:
                     63: void
                     64: lm700x_hardware_write(struct lm700x_t *lm, u_int32_t data, u_int32_t addon)
                     65: {
                     66:        int i;
                     67:
                     68:        lm->init(lm->iot, lm->ioh, lm->offset, lm->rsetdata | addon);
                     69:
                     70:        for (i = 0; i < LM700X_REGISTER_LENGTH; i++)
                     71:                if (data & (1 << i)) {
                     72:                        bus_space_write_1(lm->iot, lm->ioh, lm->offset,
                     73:                                        lm->wocl | addon);
                     74:                        DELAY(LM700X_WRITE_DELAY);
                     75:                        bus_space_write_1(lm->iot, lm->ioh, lm->offset,
                     76:                                        lm->woch | addon);
                     77:                        DELAY(LM700X_WRITE_DELAY);
                     78:                        bus_space_write_1(lm->iot, lm->ioh, lm->offset,
                     79:                                        lm->wocl | addon);
                     80:                } else {
                     81:                        bus_space_write_1(lm->iot, lm->ioh, lm->offset,
                     82:                                        lm->wzcl | addon);
                     83:                        DELAY(LM700X_WRITE_DELAY);
                     84:                        bus_space_write_1(lm->iot, lm->ioh, lm->offset,
                     85:                                        lm->wzch | addon);
                     86:                        DELAY(LM700X_WRITE_DELAY);
                     87:                        bus_space_write_1(lm->iot, lm->ioh, lm->offset,
                     88:                                        lm->wzcl | addon);
                     89:                }
                     90:
                     91:        lm->rset(lm->iot, lm->ioh, lm->offset, lm->rsetdata | addon);
                     92: }
                     93:
                     94: u_int32_t
                     95: lm700x_encode_ref(u_int8_t rf)
                     96: {
                     97:        u_int32_t ret;
                     98:
                     99:        if (rf < 36)
                    100:                ret = LM700X_REF_025;
                    101:        else if (rf > 35 && rf < 75)
                    102:                        ret = LM700X_REF_050;
                    103:        else
                    104:                ret = LM700X_REF_100;
                    105:
                    106:        return ret;
                    107: }
                    108:
                    109: u_int8_t
                    110: lm700x_decode_ref(u_int32_t rf)
                    111: {
                    112:        u_int8_t ret;
                    113:
                    114:        switch (rf) {
                    115:        case LM700X_REF_100:
                    116:                ret = 100;
                    117:                break;
                    118:        case LM700X_REF_025:
                    119:                ret = 25;
                    120:                break;
                    121:        case LM700X_REF_050:
                    122:                /* FALLTHROUGH */
                    123:        default:
                    124:                ret = 50;
                    125:                break;
                    126:        }
                    127:
                    128:        return ret;
                    129: }