FreeBSD/Linux Kernel Cross Reference
sys/dev/ic/lm700x.c

     /* $NetBSD: lm700x.c,v 1.2 2003/07/14 15:47:11 lukem Exp $ */
     /*      $OpenBSD: lm700x.c,v 1.2 2001/12/06 16:28:18 mickey Exp $       */
     
     /*
      * Copyright (c) 2001 Vladimir Popov <jumbo@narod.ru>
      * All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
     * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
     * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
     * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
     * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
     * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
     * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     */
    
    /* Implementation of most common lm700x routines */
    
    /*
     * Sanyo LM7001 Direct PLL Frequency Synthesizer
     *    ??? See http://www.redsword.com/tjacobs/geeb/fmcard.htm
     *
     * The LM7001J and LM7001JM (used in Aztech/PackardBell cards) are PLL
     * frequency synthesizer LSIs for tuners. These LSIs are software compatible
     * with LM7000 (used in Radiotrack, Radioreveal RA300, some Mediaforte cards),
     * but do not include an IF calculation circuit.
     *
     * The FM VCO circuit includes a high-speed programmable divider that can
     * divide directly.
     *
     * Features:
     * Seven reference frequencies: 1, 5, 9, 10, 25, 50, and 100 kHz;
     * Band-switching outputs (3 bits);
     * Controller clock output (400 kHz);
     * Serial input circuit for data input (using the CE, CL and DATA pins).
     *
     * The LM7001J and LM7001JM have a 24-bit shift register.
     */
    
    #include <sys/cdefs.h>
    __KERNEL_RCSID(0, "$NetBSD: lm700x.c,v 1.2 2003/07/14 15:47:11 lukem Exp $");
    
    #include <sys/param.h>
    #include <sys/radioio.h>
    
    #include <dev/ic/lm700x.h>
    
    u_int32_t
    lm700x_encode_freq(u_int32_t nfreq, u_int32_t rf)
    {
            nfreq += IF_FREQ;
            nfreq /= lm700x_decode_ref(rf);
            return nfreq;
    }
    
    void
    lm700x_hardware_write(struct lm700x_t *lm, u_int32_t data, u_int32_t addon)
    {
            int i;
    
            lm->init(lm->iot, lm->ioh, lm->offset, lm->rsetdata | addon);
    
            for (i = 0; i < LM700X_REGISTER_LENGTH; i++)
                    if (data & (1 << i)) {
                            bus_space_write_1(lm->iot, lm->ioh, lm->offset,
                                            lm->wocl | addon);
                            DELAY(LM700X_WRITE_DELAY);
                            bus_space_write_1(lm->iot, lm->ioh, lm->offset,
                                            lm->woch | addon);
                            DELAY(LM700X_WRITE_DELAY);
                            bus_space_write_1(lm->iot, lm->ioh, lm->offset,
                                            lm->wocl | addon);
                    } else {
                            bus_space_write_1(lm->iot, lm->ioh, lm->offset,
                                            lm->wzcl | addon);
                            DELAY(LM700X_WRITE_DELAY);
                            bus_space_write_1(lm->iot, lm->ioh, lm->offset,
                                            lm->wzch | addon);
                            DELAY(LM700X_WRITE_DELAY);
                            bus_space_write_1(lm->iot, lm->ioh, lm->offset,
                                            lm->wzcl | addon);
                    }
    
            lm->rset(lm->iot, lm->ioh, lm->offset, lm->rsetdata | addon);
    }
    
    u_int32_t
   lm700x_encode_ref(u_int8_t rf)
   {
           u_int32_t ret;
   
           if (rf < 36)
                   ret = LM700X_REF_025;
           else if (rf > 35 && rf < 75)
                           ret = LM700X_REF_050;
           else
                   ret = LM700X_REF_100;
   
           return ret;
   }
   
   u_int8_t
   lm700x_decode_ref(u_int32_t rf)
   {
           u_int8_t ret;
   
           switch (rf) {
           case LM700X_REF_100:
                   ret = 100;
                   break;
           case LM700X_REF_025:
                   ret = 25;
                   break;
           case LM700X_REF_050:
                   /* FALLTHROUGH */
           default:
                   ret = 50;
                   break;
           }
   
           return ret;
   }

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