ae28ee13b4
Amancio. There is some SoundSource support here that is primitive and probably doesn't work, but I'll let the two submitters let me know how my integration of that was since I don't have this card to test. I've only tested this on my GUS MAX since it's all I have. This all probably needs to be re-done anyway since we're widely variant from the original VOXWARE source in the current layout. Submitted by: Amancio Hasty and Jim Lowe Obtained from: Hannu Savolainen
469 lines
10 KiB
C
469 lines
10 KiB
C
/*
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* sound/midibuf.c
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*
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* Device file manager for /dev/midi#
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*
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* Copyright by Hannu Savolainen 1993
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met: 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer. 2.
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* Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
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* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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*/
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#include "sound_config.h"
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#if defined(CONFIGURE_SOUNDCARD) && !defined(EXCLUDE_MIDI)
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/*
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* Don't make MAX_QUEUE_SIZE larger than 4000
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*/
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#define MAX_QUEUE_SIZE 4000
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DEFINE_WAIT_QUEUES (midi_sleeper[MAX_MIDI_DEV], midi_sleep_flag[MAX_MIDI_DEV]);
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DEFINE_WAIT_QUEUES (input_sleeper[MAX_MIDI_DEV], input_sleep_flag[MAX_MIDI_DEV]);
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struct midi_buf
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{
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int len, head, tail;
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unsigned char queue[MAX_QUEUE_SIZE];
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};
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struct midi_parms
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{
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int prech_timeout; /*
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* Timeout before the first ch
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*/
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};
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static struct midi_buf *midi_out_buf[MAX_MIDI_DEV] =
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{NULL};
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static struct midi_buf *midi_in_buf[MAX_MIDI_DEV] =
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{NULL};
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static struct midi_parms parms[MAX_MIDI_DEV];
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static void midi_poll (unsigned long dummy);
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DEFINE_TIMER (poll_timer, midi_poll);
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static volatile int open_devs = 0;
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#define DATA_AVAIL(q) (q->len)
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#define SPACE_AVAIL(q) (MAX_QUEUE_SIZE - q->len)
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#define QUEUE_BYTE(q, data) \
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if (SPACE_AVAIL(q)) \
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{ \
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unsigned long flags; \
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DISABLE_INTR(flags); \
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q->queue[q->tail] = (data); \
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q->len++; q->tail = (q->tail+1) % MAX_QUEUE_SIZE; \
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RESTORE_INTR(flags); \
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}
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#define REMOVE_BYTE(q, data) \
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if (DATA_AVAIL(q)) \
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{ \
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unsigned long flags; \
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DISABLE_INTR(flags); \
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data = q->queue[q->head]; \
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q->len--; q->head = (q->head+1) % MAX_QUEUE_SIZE; \
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RESTORE_INTR(flags); \
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}
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void
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drain_midi_queue (int dev)
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{
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/*
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* Give the Midi driver time to drain its output queues
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*/
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if (midi_devs[dev]->buffer_status != NULL)
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while (!PROCESS_ABORTING (midi_sleeper[dev], midi_sleep_flag[dev]) &&
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midi_devs[dev]->buffer_status (dev))
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DO_SLEEP (midi_sleeper[dev], midi_sleep_flag[dev], HZ / 10);
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}
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static void
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midi_input_intr (int dev, unsigned char data)
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{
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if (midi_in_buf[dev] == NULL)
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return;
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if (data == 0xfe) /*
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* Active sensing
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*/
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return; /*
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* Ignore
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*/
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if (SPACE_AVAIL (midi_in_buf[dev]))
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{
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QUEUE_BYTE (midi_in_buf[dev], data);
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if (SOMEONE_WAITING (input_sleeper[dev], input_sleep_flag[dev]))
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WAKE_UP (input_sleeper[dev], input_sleep_flag[dev]);
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}
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#if defined(__FreeBSD__)
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if (selinfo[dev].si_pid)
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selwakeup(&selinfo[dev]);
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#endif
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}
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static void
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midi_output_intr (int dev)
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{
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/*
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* Currently NOP
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*/
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#if defined(__FreeBSD__)
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if (selinfo[dev].si_pid)
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selwakeup(&selinfo[dev]);
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#endif
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}
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static void
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midi_poll (unsigned long dummy)
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{
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unsigned long flags;
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int dev;
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DISABLE_INTR (flags);
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if (open_devs)
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{
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for (dev = 0; dev < num_midis; dev++)
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if (midi_out_buf[dev] != NULL)
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{
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while (DATA_AVAIL (midi_out_buf[dev]) &&
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midi_devs[dev]->putc (dev,
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midi_out_buf[dev]->queue[midi_out_buf[dev]->head]))
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{
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midi_out_buf[dev]->head = (midi_out_buf[dev]->head + 1) % MAX_QUEUE_SIZE;
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midi_out_buf[dev]->len--;
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}
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if (DATA_AVAIL (midi_out_buf[dev]) < 100 &&
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SOMEONE_WAITING (midi_sleeper[dev], midi_sleep_flag[dev]))
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WAKE_UP (midi_sleeper[dev], midi_sleep_flag[dev]);
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}
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ACTIVATE_TIMER (poll_timer, midi_poll, 1); /*
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* Come back later
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*/
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}
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RESTORE_INTR (flags);
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}
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int
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MIDIbuf_open (int dev, struct fileinfo *file)
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{
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int mode, err;
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unsigned long flags;
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dev = dev >> 4;
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mode = file->mode & O_ACCMODE;
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if (num_midis > MAX_MIDI_DEV)
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{
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printk ("Sound: FATAL ERROR: Too many midi interfaces\n");
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num_midis = MAX_MIDI_DEV;
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}
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if (dev < 0 || dev >= num_midis)
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{
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printk ("Sound: Nonexistent MIDI interface %d\n", dev);
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return RET_ERROR (ENXIO);
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}
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/*
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* Interrupts disabled. Be careful
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*/
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DISABLE_INTR (flags);
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if ((err = midi_devs[dev]->open (dev, mode,
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midi_input_intr, midi_output_intr)) < 0)
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{
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RESTORE_INTR (flags);
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return err;
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}
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parms[dev].prech_timeout = 0;
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RESET_WAIT_QUEUE (midi_sleeper[dev], midi_sleep_flag[dev]);
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RESET_WAIT_QUEUE (input_sleeper[dev], input_sleep_flag[dev]);
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midi_in_buf[dev] = (struct midi_buf *) KERNEL_MALLOC (sizeof (struct midi_buf));
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if (midi_in_buf[dev] == NULL)
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{
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printk ("midi: Can't allocate buffer\n");
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midi_devs[dev]->close (dev);
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RESTORE_INTR (flags);
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return RET_ERROR (EIO);
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}
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midi_in_buf[dev]->len = midi_in_buf[dev]->head = midi_in_buf[dev]->tail = 0;
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midi_out_buf[dev] = (struct midi_buf *) KERNEL_MALLOC (sizeof (struct midi_buf));
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if (midi_out_buf[dev] == NULL)
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{
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printk ("midi: Can't allocate buffer\n");
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midi_devs[dev]->close (dev);
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KERNEL_FREE (midi_in_buf[dev]);
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midi_in_buf[dev] = NULL;
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RESTORE_INTR (flags);
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return RET_ERROR (EIO);
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}
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midi_out_buf[dev]->len = midi_out_buf[dev]->head = midi_out_buf[dev]->tail = 0;
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if (!open_devs)
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ACTIVATE_TIMER (poll_timer, midi_poll, 1); /*
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* Come back later
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*/
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open_devs++;
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RESTORE_INTR (flags);
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return err;
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}
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void
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MIDIbuf_release (int dev, struct fileinfo *file)
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{
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int mode;
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unsigned long flags;
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dev = dev >> 4;
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mode = file->mode & O_ACCMODE;
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DISABLE_INTR (flags);
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/*
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* Wait until the queue is empty
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*/
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if (mode != OPEN_READ)
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{
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midi_devs[dev]->putc (dev, 0xfe); /*
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* Active sensing to shut the
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* devices
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*/
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while (!PROCESS_ABORTING (midi_sleeper[dev], midi_sleep_flag[dev]) &&
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DATA_AVAIL (midi_out_buf[dev]))
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DO_SLEEP (midi_sleeper[dev], midi_sleep_flag[dev], 0); /*
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* Sync
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*/
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drain_midi_queue (dev); /*
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* Ensure the output queues are empty
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*/
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}
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midi_devs[dev]->close (dev);
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KERNEL_FREE (midi_in_buf[dev]);
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KERNEL_FREE (midi_out_buf[dev]);
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midi_in_buf[dev] = NULL;
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midi_out_buf[dev] = NULL;
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open_devs--;
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RESTORE_INTR (flags);
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}
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int
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MIDIbuf_write (int dev, struct fileinfo *file, snd_rw_buf * buf, int count)
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{
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unsigned long flags;
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int c, n, i;
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unsigned char tmp_data;
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dev = dev >> 4;
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if (!count)
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return 0;
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DISABLE_INTR (flags);
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c = 0;
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while (c < count)
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{
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n = SPACE_AVAIL (midi_out_buf[dev]);
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if (n == 0) /*
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* No space just now. We have to sleep
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*/
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{
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DO_SLEEP (midi_sleeper[dev], midi_sleep_flag[dev], 0);
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if (PROCESS_ABORTING (midi_sleeper[dev], midi_sleep_flag[dev]))
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{
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RESTORE_INTR (flags);
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return RET_ERROR (EINTR);
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}
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n = SPACE_AVAIL (midi_out_buf[dev]);
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}
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if (n > (count - c))
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n = count - c;
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for (i = 0; i < n; i++)
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{
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COPY_FROM_USER (&tmp_data, buf, c, 1);
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QUEUE_BYTE (midi_out_buf[dev], tmp_data);
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c++;
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}
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}
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RESTORE_INTR (flags);
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return c;
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}
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int
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MIDIbuf_read (int dev, struct fileinfo *file, snd_rw_buf * buf, int count)
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{
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int n, c = 0;
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unsigned long flags;
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unsigned char tmp_data;
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dev = dev >> 4;
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DISABLE_INTR (flags);
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if (!DATA_AVAIL (midi_in_buf[dev])) /*
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* No data yet, wait
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*/
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{
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DO_SLEEP (input_sleeper[dev], input_sleep_flag[dev],
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parms[dev].prech_timeout);
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if (PROCESS_ABORTING (input_sleeper[dev], input_sleep_flag[dev]))
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c = RET_ERROR (EINTR); /*
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* The user is getting restless
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*/
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}
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if (c == 0 && DATA_AVAIL (midi_in_buf[dev])) /*
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* Got some bytes
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*/
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{
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n = DATA_AVAIL (midi_in_buf[dev]);
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if (n > count)
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n = count;
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c = 0;
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while (c < n)
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{
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REMOVE_BYTE (midi_in_buf[dev], tmp_data);
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COPY_TO_USER (buf, c, &tmp_data, 1);
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c++;
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}
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}
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RESTORE_INTR (flags);
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return c;
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}
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int
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MIDIbuf_ioctl (int dev, struct fileinfo *file,
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unsigned int cmd, unsigned int arg)
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{
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int val;
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dev = dev >> 4;
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if (((cmd >> 8) & 0xff) == 'C')
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{
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if (midi_devs[dev]->coproc) /* Coprocessor ioctl */
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return midi_devs[dev]->coproc->ioctl (midi_devs[dev]->coproc->devc, cmd, arg, 0);
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else
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printk ("/dev/midi%d: No coprocessor for this device\n", dev);
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return RET_ERROR (EREMOTEIO);
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}
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else
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switch (cmd)
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{
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case SNDCTL_MIDI_PRETIME:
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val = IOCTL_IN (arg);
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if (val < 0)
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val = 0;
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val = (HZ * val) / 10;
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parms[dev].prech_timeout = val;
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return IOCTL_OUT (arg, val);
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break;
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default:
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return midi_devs[dev]->ioctl (dev, cmd, arg);
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}
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}
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#ifdef ALLOW_SELECT
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int
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MIDIbuf_select (int dev, struct fileinfo *file, int sel_type, select_table * wait)
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{
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dev = dev >> 4;
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switch (sel_type)
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{
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case SEL_IN:
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if (!DATA_AVAIL (midi_in_buf[dev]))
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{
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#if defined(__FreeBSD__)
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selrecord(wait, &selinfo[dev]);
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#else
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input_sleep_flag[dev].mode = WK_SLEEP;
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select_wait (&input_sleeper[dev], wait);
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#endif
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return 0;
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}
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return 1;
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break;
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case SEL_OUT:
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if (SPACE_AVAIL (midi_out_buf[dev]))
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{
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#if defined(__FreeBSD__)
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selrecord(wait, &selinfo[dev]);
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#else
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midi_sleep_flag[dev].mode = WK_SLEEP;
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select_wait (&midi_sleeper[dev], wait);
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#endif
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return 0;
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}
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return 1;
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break;
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case SEL_EX:
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return 0;
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}
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return 0;
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}
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#endif /* ALLOW_SELECT */
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long
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MIDIbuf_init (long mem_start)
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{
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return mem_start;
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}
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#endif
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