The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/dev/sound/midi/mpu401.c

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    1 /*-
    2  * Copyright (c) 2003 Mathew Kanner
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  *
   14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   24  * SUCH DAMAGE.
   25  */
   26 
   27 #include <sys/cdefs.h>
   28 __FBSDID("$FreeBSD: stable/11/sys/dev/sound/midi/mpu401.c 331722 2018-03-29 02:50:57Z eadler $");
   29 
   30 #include <sys/param.h>
   31 #include <sys/types.h>
   32 #include <sys/param.h>
   33 #include <sys/queue.h>
   34 #include <sys/kernel.h>
   35 #include <sys/lock.h>
   36 #include <sys/mutex.h>
   37 #include <sys/proc.h>
   38 #include <sys/systm.h>
   39 #include <sys/kobj.h>
   40 #include <sys/malloc.h>
   41 #include <sys/bus.h>                    /* to get driver_intr_t */
   42 
   43 #ifdef HAVE_KERNEL_OPTION_HEADERS
   44 #include "opt_snd.h"
   45 #endif
   46 
   47 #include <dev/sound/midi/mpu401.h>
   48 #include <dev/sound/midi/midi.h>
   49 
   50 #include "mpu_if.h"
   51 #include "mpufoi_if.h"
   52 
   53 #ifndef KOBJMETHOD_END
   54 #define KOBJMETHOD_END  { NULL, NULL }
   55 #endif
   56 
   57 #define MPU_DATAPORT   0
   58 #define MPU_CMDPORT    1
   59 #define MPU_STATPORT   1
   60 #define MPU_RESET      0xff
   61 #define MPU_UART       0x3f
   62 #define MPU_ACK        0xfe
   63 #define MPU_STATMASK   0xc0
   64 #define MPU_OUTPUTBUSY 0x40
   65 #define MPU_INPUTBUSY  0x80
   66 #define MPU_TRYDATA 50
   67 #define MPU_DELAY   2500
   68 
   69 #define CMD(m,d)        MPUFOI_WRITE(m, m->cookie, MPU_CMDPORT,d)
   70 #define STATUS(m)       MPUFOI_READ(m, m->cookie, MPU_STATPORT)
   71 #define READ(m)         MPUFOI_READ(m, m->cookie, MPU_DATAPORT)
   72 #define WRITE(m,d)      MPUFOI_WRITE(m, m->cookie, MPU_DATAPORT,d)
   73 
   74 struct mpu401 {
   75         KOBJ_FIELDS;
   76         struct snd_midi *mid;
   77         int     flags;
   78         driver_intr_t *si;
   79         void   *cookie;
   80         struct callout timer;
   81 };
   82 
   83 static void mpu401_timeout(void *m);
   84 static mpu401_intr_t mpu401_intr;
   85 
   86 static int mpu401_minit(struct snd_midi *, void *);
   87 static int mpu401_muninit(struct snd_midi *, void *);
   88 static int mpu401_minqsize(struct snd_midi *, void *);
   89 static int mpu401_moutqsize(struct snd_midi *, void *);
   90 static void mpu401_mcallback(struct snd_midi *, void *, int);
   91 static void mpu401_mcallbackp(struct snd_midi *, void *, int);
   92 static const char *mpu401_mdescr(struct snd_midi *, void *, int);
   93 static const char *mpu401_mprovider(struct snd_midi *, void *);
   94 
   95 static kobj_method_t mpu401_methods[] = {
   96         KOBJMETHOD(mpu_init, mpu401_minit),
   97         KOBJMETHOD(mpu_uninit, mpu401_muninit),
   98         KOBJMETHOD(mpu_inqsize, mpu401_minqsize),
   99         KOBJMETHOD(mpu_outqsize, mpu401_moutqsize),
  100         KOBJMETHOD(mpu_callback, mpu401_mcallback),
  101         KOBJMETHOD(mpu_callbackp, mpu401_mcallbackp),
  102         KOBJMETHOD(mpu_descr, mpu401_mdescr),
  103         KOBJMETHOD(mpu_provider, mpu401_mprovider),
  104         KOBJMETHOD_END
  105 };
  106 
  107 DEFINE_CLASS(mpu401, mpu401_methods, 0);
  108 
  109 void
  110 mpu401_timeout(void *a)
  111 {
  112         struct mpu401 *m = (struct mpu401 *)a;
  113 
  114         if (m->si)
  115                 (m->si)(m->cookie);
  116 
  117 }
  118 static int
  119 mpu401_intr(struct mpu401 *m)
  120 {
  121 #define MPU_INTR_BUF    16
  122         MIDI_TYPE b[MPU_INTR_BUF];
  123         int i;
  124         int s;
  125 
  126 /*
  127         printf("mpu401_intr\n");
  128 */
  129 #define RXRDY(m) ( (STATUS(m) & MPU_INPUTBUSY) == 0)
  130 #define TXRDY(m) ( (STATUS(m) & MPU_OUTPUTBUSY) == 0)
  131 #if 0
  132 #define D(x,l) printf("mpu401_intr %d %x %s %s\n",l, x, x&MPU_INPUTBUSY?"RX":"", x&MPU_OUTPUTBUSY?"TX":"")
  133 #else
  134 #define D(x,l)
  135 #endif
  136         i = 0;
  137         s = STATUS(m);
  138         D(s, 1);
  139         while ((s & MPU_INPUTBUSY) == 0 && i < MPU_INTR_BUF) {
  140                 b[i] = READ(m);
  141 /*
  142                 printf("mpu401_intr in i %d d %d\n", i, b[i]);
  143 */
  144                 i++;
  145                 s = STATUS(m);
  146         }
  147         if (i)
  148                 midi_in(m->mid, b, i);
  149         i = 0;
  150         while (!(s & MPU_OUTPUTBUSY) && i < MPU_INTR_BUF) {
  151                 if (midi_out(m->mid, b, 1)) {
  152 /*
  153                         printf("mpu401_intr out i %d d %d\n", i, b[0]);
  154 */
  155 
  156                         WRITE(m, *b);
  157                 } else {
  158 /*
  159                         printf("mpu401_intr write: no output\n");
  160 */
  161                         return 0;
  162                 }
  163                 i++;
  164                 /* DELAY(100); */
  165                 s = STATUS(m);
  166         }
  167 
  168         if ((m->flags & M_TXEN) && (m->si)) {
  169                 callout_reset(&m->timer, 1, mpu401_timeout, m);
  170         }
  171         return (m->flags & M_TXEN) == M_TXEN;
  172 }
  173 
  174 struct mpu401 *
  175 mpu401_init(kobj_class_t cls, void *cookie, driver_intr_t softintr,
  176     mpu401_intr_t ** cb)
  177 {
  178         struct mpu401 *m;
  179 
  180         *cb = NULL;
  181         m = malloc(sizeof(*m), M_MIDI, M_NOWAIT | M_ZERO);
  182 
  183         if (!m)
  184                 return NULL;
  185 
  186         kobj_init((kobj_t)m, cls);
  187 
  188         callout_init(&m->timer, 1);
  189 
  190         m->si = softintr;
  191         m->cookie = cookie;
  192         m->flags = 0;
  193 
  194         m->mid = midi_init(&mpu401_class, 0, 0, m);
  195         if (!m->mid)
  196                 goto err;
  197         *cb = mpu401_intr;
  198         return m;
  199 err:
  200         printf("mpu401_init error\n");
  201         free(m, M_MIDI);
  202         return NULL;
  203 }
  204 
  205 int
  206 mpu401_uninit(struct mpu401 *m)
  207 {
  208         int retval;
  209 
  210         CMD(m, MPU_RESET);
  211         retval = midi_uninit(m->mid);
  212         if (retval)
  213                 return retval;
  214         free(m, M_MIDI);
  215         return 0;
  216 }
  217 
  218 static int
  219 mpu401_minit(struct snd_midi *sm, void *arg)
  220 {
  221         struct mpu401 *m = arg;
  222         int i;
  223 
  224         CMD(m, MPU_RESET);
  225         CMD(m, MPU_UART);
  226         return 0;
  227         i = 0;
  228         while (++i < 2000) {
  229                 if (RXRDY(m))
  230                         if (READ(m) == MPU_ACK)
  231                                 break;
  232         }
  233 
  234         if (i < 2000) {
  235                 CMD(m, MPU_UART);
  236                 return 0;
  237         }
  238         printf("mpu401_minit failed active sensing\n");
  239         return 1;
  240 }
  241 
  242 
  243 int
  244 mpu401_muninit(struct snd_midi *sm, void *arg)
  245 {
  246         struct mpu401 *m = arg;
  247 
  248         return MPUFOI_UNINIT(m, m->cookie);
  249 }
  250 
  251 int
  252 mpu401_minqsize(struct snd_midi *sm, void *arg)
  253 {
  254         return 128;
  255 }
  256 
  257 int
  258 mpu401_moutqsize(struct snd_midi *sm, void *arg)
  259 {
  260         return 128;
  261 }
  262 
  263 static void
  264 mpu401_mcallback(struct snd_midi *sm, void *arg, int flags)
  265 {
  266         struct mpu401 *m = arg;
  267 #if 0
  268         printf("mpu401_callback %s %s %s %s\n",
  269             flags & M_RX ? "M_RX" : "",
  270             flags & M_TX ? "M_TX" : "",
  271             flags & M_RXEN ? "M_RXEN" : "",
  272             flags & M_TXEN ? "M_TXEN" : "");
  273 #endif
  274         if (flags & M_TXEN && m->si) {
  275                 callout_reset(&m->timer, 1, mpu401_timeout, m);
  276         }
  277         m->flags = flags;
  278 }
  279 
  280 static void
  281 mpu401_mcallbackp(struct snd_midi *sm, void *arg, int flags)
  282 {
  283 /*      printf("mpu401_callbackp\n"); */
  284         mpu401_mcallback(sm, arg, flags);
  285 }
  286 
  287 static const char *
  288 mpu401_mdescr(struct snd_midi *sm, void *arg, int verbosity)
  289 {
  290 
  291         return "descr mpu401";
  292 }
  293 
  294 static const char *
  295 mpu401_mprovider(struct snd_midi *m, void *arg)
  296 {
  297         return "provider mpu401";
  298 }

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