static int
insert_queue(struct seq_oss_devinfo *dp, union evrec *rec, struct file *opt)
{
int rc = 0;
struct snd_seq_event event;
/* if this is a timing event, process the current time */
if (snd_seq_oss_process_timer_event(dp->timer, rec))
return 0; /* no need to insert queue */
/* parse this event */
memset(&event, 0, sizeof(event));
/* set dummy -- to be sure */
event.type = SNDRV_SEQ_EVENT_NOTEOFF;
snd_seq_oss_fill_addr(dp, &event, dp->addr.port, dp->addr.client);
if (snd_seq_oss_process_event(dp, rec, &event))
return 0; /* invalid event - no need to insert queue */
event.time.tick = snd_seq_oss_timer_cur_tick(dp->timer);
if (dp->timer->realtime || !dp->timer->running) {
snd_seq_oss_dispatch(dp, &event, 0, 0);
} else {
if (is_nonblock_mode(dp->file_mode))
rc = snd_seq_kernel_client_enqueue(dp->cseq, &event, 0, 0);
else
rc = snd_seq_kernel_client_enqueue_blocking(dp->cseq, &event, opt, 0, 0);
}
return rc;
}
int
snd_seq_oss_read(seq_oss_devinfo_t *dp, char __user *buf, int count)
{
seq_oss_readq_t *readq = dp->readq;
int cnt, pos;
evrec_t *q;
unsigned long flags;
if (readq == NULL || ! is_read_mode(dp->file_mode))
return -EIO;
/* copy queued events to read buffer */
cnt = count;
pos = 0;
q = snd_seq_oss_readq_pick(readq, !is_nonblock_mode(dp->file_mode), &flags);
if (q == NULL)
return 0;
do {
int ev_len;
/* tansfer the data */
ev_len = ev_length(q);
if (copy_to_user(buf + pos, q, ev_len)) {
snd_seq_oss_readq_unlock(readq, flags);
break;
}
snd_seq_oss_readq_free(readq, flags);
pos += ev_len;
cnt -= ev_len;
if (cnt < ev_len)
break;
} while ((q = snd_seq_oss_readq_pick(readq, 0, &flags)) != NULL);
return count - cnt;
}
int
snd_seq_oss_write(seq_oss_devinfo_t *dp, const char __user *buf, int count, struct file *opt)
{
int rc, c, p, ev_size;
evrec_t rec;
if (! is_write_mode(dp->file_mode) || dp->writeq == NULL)
return -EIO;
c = count;
p = 0;
while (c >= SHORT_EVENT_SIZE) {
if (copy_from_user(rec.c, buf + p, SHORT_EVENT_SIZE))
break;
p += SHORT_EVENT_SIZE;
if (rec.s.code == SEQ_FULLSIZE) {
/* load patch */
int fmt = (*(unsigned short *)rec.c) & 0xffff;
return snd_seq_oss_synth_load_patch(dp, rec.s.dev, fmt, buf, p, c);
}
if (ev_is_long(&rec)) {
/* extended code */
if (rec.s.code == SEQ_EXTENDED &&
dp->seq_mode == SNDRV_SEQ_OSS_MODE_MUSIC)
return -EINVAL;
ev_size = LONG_EVENT_SIZE;
if (c < ev_size)
break;
/* copy the reset 4 bytes */
if (copy_from_user(rec.c + SHORT_EVENT_SIZE, buf + p,
LONG_EVENT_SIZE - SHORT_EVENT_SIZE))
break;
p += LONG_EVENT_SIZE - SHORT_EVENT_SIZE;
} else {
/* old-type code */
if (dp->seq_mode == SNDRV_SEQ_OSS_MODE_MUSIC)
return -EINVAL;
ev_size = SHORT_EVENT_SIZE;
}
/* insert queue */
if ((rc = insert_queue(dp, &rec, opt)) < 0)
break;
c -= ev_size;
}
if (count == c && is_nonblock_mode(dp->file_mode))
return -EAGAIN;
return count - c;
}
int
snd_seq_oss_read(struct seq_oss_devinfo *dp, char __user *buf, int count)
{
struct seq_oss_readq *readq = dp->readq;
int result = 0, err = 0;
int ev_len;
union evrec rec;
unsigned long flags;
if (readq == NULL || ! is_read_mode(dp->file_mode))
return -ENXIO;
while (count >= SHORT_EVENT_SIZE) {
snd_seq_oss_readq_lock(readq, flags);
err = snd_seq_oss_readq_pick(readq, &rec);
if (err == -EAGAIN &&
!is_nonblock_mode(dp->file_mode) && result == 0) {
snd_seq_oss_readq_unlock(readq, flags);
snd_seq_oss_readq_wait(readq);
snd_seq_oss_readq_lock(readq, flags);
if (signal_pending(current))
err = -ERESTARTSYS;
else
err = snd_seq_oss_readq_pick(readq, &rec);
}
if (err < 0) {
snd_seq_oss_readq_unlock(readq, flags);
break;
}
ev_len = ev_length(&rec);
if (ev_len < count) {
snd_seq_oss_readq_unlock(readq, flags);
break;
}
snd_seq_oss_readq_free(readq);
snd_seq_oss_readq_unlock(readq, flags);
if (copy_to_user(buf, &rec, ev_len)) {
err = -EFAULT;
break;
}
result += ev_len;
buf += ev_len;
count -= ev_len;
}
return result > 0 ? result : err;
}
