freebsd-dev/sys/i386/isa/sound/midibuf.c
Bruce Evans b8be6ed0c2 Added a used include. This file doesn't get tested by LINT because
it is null when trix is configured.

Submitted by:	Brian Feldman <green@unixhelp.org> but moved by me
1999-02-04 08:52:46 +00:00

432 lines
9.4 KiB
C

/*
* sound/midibuf.c
*
* Device file manager for /dev/midi#
*
* Copyright by Hannu Savolainen 1993
*
* 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 AND CONTRIBUTORS ``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 OR CONTRIBUTORS 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.
*
*/
#include <i386/isa/sound/sound_config.h>
#if defined(CONFIG_MIDI)
#include <sys/select.h>
/*
* Don't make MAX_QUEUE_SIZE larger than 4000
*/
#define MAX_QUEUE_SIZE 4000
int
MIDIbuf_poll (int dev, struct fileinfo *file, int events, select_table * wait);
static void
drain_midi_queue(int dev);
static int *midi_sleeper[MAX_MIDI_DEV] = {NULL};
static volatile struct snd_wait midi_sleep_flag[MAX_MIDI_DEV] = { {0}};
static int *input_sleeper[MAX_MIDI_DEV] = {NULL};
static volatile struct snd_wait input_sleep_flag[MAX_MIDI_DEV] = { {0}};
struct midi_buf {
int len, head, tail;
u_char queue[MAX_QUEUE_SIZE];
};
struct midi_parms {
int prech_timeout; /* Timeout before the first ch */
};
static struct midi_buf *midi_out_buf[MAX_MIDI_DEV] = {NULL};
static struct midi_buf *midi_in_buf[MAX_MIDI_DEV] = {NULL};
static struct midi_parms parms[MAX_MIDI_DEV];
static void midi_poll(void *dummy);
static volatile int open_devs = 0;
#define DATA_AVAIL(q) (q->len)
#define SPACE_AVAIL(q) (MAX_QUEUE_SIZE - q->len)
#define QUEUE_BYTE(q, data) \
if (SPACE_AVAIL(q)) { \
u_long flags; \
flags = splhigh(); \
q->queue[q->tail] = (data); \
q->len++; q->tail = (q->tail+1) % MAX_QUEUE_SIZE; \
splx(flags); \
}
#define REMOVE_BYTE(q, data) \
if (DATA_AVAIL(q)) { \
u_long flags; \
flags = splhigh(); \
data = q->queue[q->head]; \
q->len--; q->head = (q->head+1) % MAX_QUEUE_SIZE; \
splx(flags); \
}
static void
drain_midi_queue(int dev)
{
/*
* Give the Midi driver time to drain its output queues
*/
if (midi_devs[dev]->buffer_status != NULL)
while (!(PROCESS_ABORTING (midi_sleep_flag[dev])) &&
midi_devs[dev]->buffer_status(dev)) {
int chn;
midi_sleeper[dev] = &chn;
DO_SLEEP(chn, midi_sleep_flag[dev], hz / 10);
};
}
static void
midi_input_intr(int dev, u_char data)
{
if (midi_in_buf[dev] == NULL)
return;
if (data == 0xfe) /* Active sensing */
return; /* Ignore */
if (SPACE_AVAIL(midi_in_buf[dev])) {
QUEUE_BYTE(midi_in_buf[dev], data);
if ((input_sleep_flag[dev].mode & WK_SLEEP)) {
input_sleep_flag[dev].mode = WK_WAKEUP;
wakeup(input_sleeper[dev]);
};
}
}
static void
midi_output_intr(int dev)
{
/*
* Currently NOP
*/
}
static void
midi_poll(void *dummy)
{
u_long flags;
int dev;
flags = splhigh();
if (open_devs) {
for (dev = 0; dev < num_midis; dev++)
if (midi_out_buf[dev] != NULL) {
while (DATA_AVAIL(midi_out_buf[dev]) &&
midi_devs[dev]->putc(dev,
midi_out_buf[dev]->queue[midi_out_buf[dev]->head])) {
midi_out_buf[dev]->head = (midi_out_buf[dev]->head + 1) % MAX_QUEUE_SIZE;
midi_out_buf[dev]->len--;
}
if (DATA_AVAIL(midi_out_buf[dev]) < 100 &&
(midi_sleep_flag[dev].mode & WK_SLEEP)) {
midi_sleep_flag[dev].mode = WK_WAKEUP;
wakeup(midi_sleeper[dev]);
};
}
timeout( midi_poll, 0, 1);; /* Come back later */
}
splx(flags);
}
int
MIDIbuf_open(int dev, struct fileinfo * file)
{
int mode, err;
dev = dev >> 4;
mode = file->mode & O_ACCMODE;
if (num_midis > MAX_MIDI_DEV) {
printf("Sound: FATAL ERROR: Too many midi interfaces\n");
num_midis = MAX_MIDI_DEV;
}
if (dev < 0 || dev >= num_midis) {
printf("Sound: Nonexistent MIDI interface %d\n", dev);
return -(ENXIO);
}
/*
* Interrupts disabled. Be careful
*/
if ((err = midi_devs[dev]->open(dev, mode,
midi_input_intr, midi_output_intr)) < 0) {
return err;
}
parms[dev].prech_timeout = 0;
midi_in_buf[dev] = (struct midi_buf *) malloc(sizeof(struct midi_buf), M_TEMP, M_WAITOK);
if (midi_in_buf[dev] == NULL) {
printf("midi: Can't allocate buffer\n");
midi_devs[dev]->close(dev);
return -(EIO);
}
midi_in_buf[dev]->len = midi_in_buf[dev]->head = midi_in_buf[dev]->tail = 0;
midi_out_buf[dev] = (struct midi_buf *) malloc(sizeof(struct midi_buf), M_TEMP, M_WAITOK);
if (midi_out_buf[dev] == NULL) {
printf("midi: Can't allocate buffer\n");
midi_devs[dev]->close(dev);
free(midi_in_buf[dev], M_TEMP);
midi_in_buf[dev] = NULL;
return -(EIO);
}
midi_out_buf[dev]->len = midi_out_buf[dev]->head = midi_out_buf[dev]->tail = 0;
open_devs++;
{
midi_sleep_flag[dev].aborting = 0;
midi_sleep_flag[dev].mode = WK_NONE;
};
{
input_sleep_flag[dev].aborting = 0;
input_sleep_flag[dev].mode = WK_NONE;
};
if (open_devs < 2) { /* This was first open */
{
};
timeout( midi_poll, 0, 1);; /* Start polling */
}
return err;
}
void
MIDIbuf_release(int dev, struct fileinfo * file)
{
int mode;
u_long flags;
dev = dev >> 4;
mode = file->mode & O_ACCMODE;
if (dev < 0 || dev >= num_midis)
return;
flags = splhigh();
/*
* Wait until the queue is empty
*/
if (mode != OPEN_READ) {
midi_devs[dev]->putc(dev, 0xfe); /* Active sensing to
* shut the devices */
while (!(PROCESS_ABORTING (midi_sleep_flag[dev])) &&
DATA_AVAIL(midi_out_buf[dev])) {
int chn;
midi_sleeper[dev] = &chn;
DO_SLEEP(chn, midi_sleep_flag[dev], 0);
}; /* Sync */
drain_midi_queue(dev); /* Ensure the output queues are empty */
}
splx(flags);
midi_devs[dev]->close(dev);
free(midi_in_buf[dev], M_TEMP);
free(midi_out_buf[dev], M_TEMP);
midi_in_buf[dev] = NULL;
midi_out_buf[dev] = NULL;
if (open_devs < 2) {
};
open_devs--;
}
int
MIDIbuf_write(int dev, struct fileinfo * file, snd_rw_buf * buf, int count)
{
u_long flags;
int c, n, i;
u_char tmp_data;
dev = dev >> 4;
if (!count)
return 0;
flags = splhigh();
c = 0;
while (c < count) {
n = SPACE_AVAIL(midi_out_buf[dev]);
if (n == 0) { /* No space just now. We have to sleep */
{
int chn;
midi_sleeper[dev] = &chn;
DO_SLEEP(chn, midi_sleep_flag[dev], 0);
};
if (PROCESS_ABORTING(midi_sleep_flag[dev])) {
splx(flags);
return -(EINTR);
}
n = SPACE_AVAIL(midi_out_buf[dev]);
}
if (n > (count - c))
n = count - c;
for (i = 0; i < n; i++) {
if (uiomove((char *) &tmp_data, 1, buf)) {
printf("sb: Bad copyin()!\n");
};
QUEUE_BYTE(midi_out_buf[dev], tmp_data);
c++;
}
}
splx(flags);
return c;
}
int
MIDIbuf_read(int dev, struct fileinfo * file, snd_rw_buf * buf, int count)
{
int n, c = 0;
u_long flags;
u_char tmp_data;
dev = dev >> 4;
flags = splhigh();
if (!DATA_AVAIL(midi_in_buf[dev])) { /* No data yet, wait */
{
int chn;
input_sleeper[dev] = &chn;
DO_SLEEP(chn, input_sleep_flag[dev],
parms[dev].prech_timeout);
};
if (PROCESS_ABORTING(input_sleep_flag[dev]))
c = -(EINTR); /* The user is getting restless */
}
if (c == 0 && DATA_AVAIL(midi_in_buf[dev])) { /* Got some bytes */
n = DATA_AVAIL(midi_in_buf[dev]);
if (n > count)
n = count;
c = 0;
while (c < n) {
REMOVE_BYTE(midi_in_buf[dev], tmp_data);
if (uiomove((char *) &tmp_data, 1, buf)) {
printf("sb: Bad copyout()!\n");
};
c++;
}
}
splx(flags);
return c;
}
int
MIDIbuf_ioctl(int dev, struct fileinfo * file, u_int cmd, ioctl_arg arg)
{
int val;
dev = dev >> 4;
if (((cmd >> 8) & 0xff) == 'C') {
if (midi_devs[dev]->coproc) /* Coprocessor ioctl */
return midi_devs[dev]->coproc->ioctl(midi_devs[dev]->coproc->devc, cmd, arg, 0);
else
printf("/dev/midi%d: No coprocessor for this device\n", dev);
return -(ENXIO);
} else
switch (cmd) {
case SNDCTL_MIDI_PRETIME:
val = (int) (*(int *) arg);
if (val < 0)
val = 0;
val = (hz * val) / 10;
parms[dev].prech_timeout = val;
return *(int *) arg = val;
break;
default:
return midi_devs[dev]->ioctl(dev, cmd, arg);
}
}
#ifdef ALLOW_POLL
int
MIDIbuf_poll (int dev, struct fileinfo *file, int events, select_table * wait)
{
int revents = 0;
dev = dev >> 4;
if (events & (POLLIN | POLLRDNORM))
if (!DATA_AVAIL (midi_in_buf[dev]))
selrecord(wait, &selinfo[dev]);
else
revents |= events & (POLLIN | POLLRDNORM);
if (events & (POLLOUT | POLLWRNORM))
if (SPACE_AVAIL (midi_out_buf[dev]))
selrecord(wait, &selinfo[dev]);
else
revents |= events & (POLLOUT | POLLWRNORM);
return revents;
}
#endif /* ALLOW_SELECT */
#endif