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/sequencer.h

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    1 /*
    2  * Include file for midi sequencer driver.
    3  * 
    4  * Copyright by Seigo Tanimura 1999.
    5  *
    6  * Redistribution and use in source and binary forms, with or without
    7  * modification, are permitted provided that the following conditions
    8  * are met:
    9  * 1. Redistributions of source code must retain the above copyright
   10  *    notice, this list of conditions and the following disclaimer.
   11  * 2. Redistributions in binary form must reproduce the above copyright
   12  *    notice, this list of conditions and the following disclaimer in the
   13  *    documentation and/or other materials provided with the distribution.
   14  *
   15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   16  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   17  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   18  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   19  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   20  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   21  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   22  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   23  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   24  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   25  * SUCH DAMAGE.
   26  *
   27  * $FreeBSD: releng/5.0/sys/dev/sound/midi/sequencer.h 88869 2002-01-04 01:13:49Z tanimura $
   28  *
   29  */
   30 
   31 /*
   32  * first, include kernel header files.
   33  */
   34 
   35 #ifndef _SEQUENCER_H_
   36 #define _SEQUENCER_H_
   37 
   38 #include <sys/param.h>
   39 #include <sys/systm.h>
   40 #include <sys/ioccom.h>
   41 
   42 #include <sys/filio.h>
   43 #include <sys/sockio.h>
   44 #include <sys/fcntl.h>
   45 #include <sys/tty.h>
   46 #include <sys/proc.h>
   47 
   48 #include <sys/kernel.h> /* for DATA_SET */
   49 
   50 #include <sys/conf.h>
   51 #include <sys/file.h>
   52 #include <sys/uio.h>
   53 #include <sys/syslog.h>
   54 #include <sys/errno.h>
   55 #include <sys/malloc.h>
   56 #include <sys/condvar.h>
   57 #include <machine/clock.h>      /* for DELAY */
   58 #include <sys/soundcard.h>
   59 
   60 #include <dev/sound/midi/timer.h>
   61 
   62 #define SEQ_CDEV_MAJOR MIDI_CDEV_MAJOR
   63 
   64 /*
   65  * the following assumes that FreeBSD 3.X uses poll(2) instead of select(2).
   66  * This change dates to late 1997.
   67  */
   68 #include <sys/poll.h>
   69 #define d_select_t d_poll_t
   70 
   71 /* Return value from seq_playevent and timer event handers. */
   72 enum {
   73         MORE,
   74         TIMERARMED,
   75         QUEUEFULL
   76 };
   77 
   78 typedef struct _seqdev_info seqdev_info;
   79 
   80 /*
   81  * The order of mutex lock (from the first to the last)
   82  *
   83  * 1. sequencer flags, queues, timer and device list
   84  * 2. midi synth voice and channel
   85  * 3. midi synth status
   86  * 4. generic midi flags and queues
   87  * 5. midi device
   88  */
   89 
   90 /*
   91  * descriptor of sequencer operations ...
   92  *
   93  */
   94 
   95 struct _seqdev_info {
   96 
   97         /*
   98          * the first part of the descriptor is filled up from a
   99          * template.
  100          */
  101         char name[64];
  102 
  103         int type ;
  104 
  105         d_open_t *open;
  106         d_close_t *close;
  107         d_read_t *read;
  108         d_write_t *write;
  109         d_ioctl_t *ioctl;
  110         d_poll_t *poll;
  111         midi_callback_t *callback;
  112 
  113         /*
  114          * combinations of the following flags are used as second argument in
  115          * the callback from the dma module to the device-specific routines.
  116          */
  117 
  118 #define SEQ_CB_RD       0x100   /* read callback */
  119 #define SEQ_CB_WR       0x200   /* write callback */
  120 #define SEQ_CB_REASON_MASK      0xff
  121 #define SEQ_CB_START    0x01   /* start dma op */
  122 #define SEQ_CB_STOP     0x03   /* stop dma op */
  123 #define SEQ_CB_ABORT    0x04   /* abort dma op */
  124 #define SEQ_CB_INIT     0x05   /* init board parameters */
  125 
  126         /*
  127          * callback extensions
  128          */
  129 #define SEQ_CB_DMADONE         0x10
  130 #define SEQ_CB_DMAUPDATE       0x11
  131 #define SEQ_CB_DMASTOP         0x12
  132 
  133         /* init can only be called with int enabled and
  134          * no pending DMA activity.
  135          */
  136 
  137         /*
  138          * whereas from here, parameters are set at runtime.
  139          * io_base == 0 means that the board is not configured.
  140          */
  141 
  142         int unit; /* unit number of the device */
  143         void *softc; /* softc for a device */
  144 
  145         int bd_id ;     /* used to hold board-id info, eg. sb version,
  146                          * mss codec type, etc. etc.
  147                          */
  148 
  149         struct mtx flagqueue_mtx; /* Mutex to protect flags and queues */
  150         struct cv insync_cv; /* Conditional variable for sync */
  151 
  152         /* Queues */
  153         midi_dbuf midi_dbuf_in; /* midi input event/message queue */
  154         midi_dbuf midi_dbuf_out; /* midi output event/message queue */
  155         
  156 
  157         /*
  158          * these parameters describe the operation of the board.
  159          * Generic things like busy flag, speed, etc are here.
  160          */
  161 
  162         /* Flags */
  163         volatile u_long  flags ;     /* 32 bits, used for various purposes. */
  164 
  165         /*
  166          * we have separate flags for read and write, although in some
  167          * cases this is probably not necessary (e.g. because we cannot
  168          * know how many processes are using the device, we cannot
  169          * distinguish if open, close, abort are for a write or for a
  170          * read).
  171          */
  172 
  173         /*
  174          * the following flag is used by open-close routines
  175          * to mark the status of the device.
  176          */
  177 #define SEQ_F_BUSY              0x0001  /* has been opened      */
  178         /*
  179          * the next two are used to allow only one pending operation of
  180          * each type.
  181          */
  182 #define SEQ_F_READING           0x0004  /* have a pending read */
  183 #define SEQ_F_WRITING           0x0008  /* have a pending write */
  184 
  185         /*
  186          * flag used to mark a pending close.
  187          */
  188 #define SEQ_F_CLOSING           0x0040  /* a pending close */
  189 
  190         /*
  191          * if user has not set block size, then make it adaptive
  192          * (0.25s, or the perhaps last read/write ?)
  193          */
  194 #define SEQ_F_HAS_SIZE          0x0080  /* user set block size */
  195         /*
  196          * assorted flags related to operating mode.
  197          */
  198 #define SEQ_F_STEREO            0x0100  /* doing stereo */
  199 #define SEQ_F_NBIO              0x0200  /* do non-blocking i/o */
  200 
  201         /*
  202          * these flags mark a pending abort on a r/w operation.
  203          */
  204 #define SEQ_F_ABORTING          0x1000  /* a pending abort */
  205 
  206         /*
  207          * this is used to mark that board initialization is needed, e.g.
  208          * because of a change in sampling rate, format, etc. -- It will
  209          * be done at the next convenient time.
  210          */
  211 #define SEQ_F_INIT              0x4000  /* changed parameters. need init */
  212 
  213 #define SEQ_F_INSYNC            0x8000  /* a pending sync */
  214 
  215         int     play_blocksize, rec_blocksize;  /* blocksize for io and dma ops */
  216 
  217 #define swsel midi_dbuf_out.sel
  218 #define srsel midi_dbuf_in.sel
  219         u_long  interrupts;     /* counter of interrupts */
  220         u_long  magic;
  221 #define MAGIC(unit) ( 0xa4d10de0 + unit )
  222         void    *device_data ;  /* just in case it is needed...*/
  223 
  224         /* The tailq entry of the next sequencer device. */
  225         TAILQ_ENTRY(_seqdev_info) sd_link;
  226 };
  227 
  228 
  229 /*
  230  * then ioctls and other stuff
  231  */
  232 #define NSEQ_MAX        16      /* Number of supported devices */
  233 
  234 /*
  235  * many variables should be reduced to a range. Here define a macro
  236  */
  237 
  238 #define RANGE(var, low, high) (var) = \
  239 ((var)<(low)?(low) : (var)>(high)?(high) : (var))
  240 
  241 /*
  242  * finally, all default parameters
  243  */
  244 #define SEQ_BUFFSIZE (1024) /* XXX */
  245 
  246 #define MIDI_DEV_SEQ    1       /* Sequencer output /dev/sequencer (FM
  247                                    synthesizer and MIDI output) */
  248 #define MIDI_DEV_MUSIC  8       /* Sequencer output /dev/music (FM
  249                                    synthesizer and MIDI output) */
  250 
  251 #ifdef _KERNEL
  252 
  253 extern midi_cmdtab      cmdtab_seqioctl[];
  254 extern midi_cmdtab      cmdtab_timer[];
  255 
  256 void    seq_timer(void *arg);
  257 int     seq_copytoinput(void *arg, u_char *event, int len);
  258 
  259 SYSCTL_DECL(_hw_midi_seq);
  260 
  261 extern int      seq_debug;
  262 #define SEQ_DEBUG(x)                    \
  263         do {                            \
  264                 if (seq_debug) {        \
  265                         (x);            \
  266                 }                       \
  267         } while(0)
  268 
  269 #endif /* _KERNEL */
  270 
  271 
  272 #endif /* _SEQUENCER_H_ */

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