2 * OSS compatible sequencer driver
4 * seq_oss_readq.c - MIDI input queue
6 * Copyright (C) 1998,99 Takashi Iwai <tiwai@suse.de>
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23 #include "seq_oss_readq.h"
24 #include "seq_oss_event.h"
25 #include <sound/seq_oss_legacy.h>
26 #include "../seq_lock.h"
27 #include <linux/wait.h>
28 #include <linux/slab.h>
33 //#define SNDRV_SEQ_OSS_MAX_TIMEOUT (unsigned long)(-1)
34 #define SNDRV_SEQ_OSS_MAX_TIMEOUT (HZ * 3600)
45 struct seq_oss_readq *
46 snd_seq_oss_readq_new(struct seq_oss_devinfo *dp, int maxlen)
48 struct seq_oss_readq *q;
50 q = kzalloc(sizeof(*q), GFP_KERNEL);
54 q->q = kcalloc(maxlen, sizeof(union evrec), GFP_KERNEL);
62 q->head = q->tail = 0;
63 init_waitqueue_head(&q->midi_sleep);
64 spin_lock_init(&q->lock);
65 q->pre_event_timeout = SNDRV_SEQ_OSS_MAX_TIMEOUT;
66 q->input_time = (unsigned long)-1;
72 * delete the read queue
75 snd_seq_oss_readq_delete(struct seq_oss_readq *q)
84 * reset the read queue
87 snd_seq_oss_readq_clear(struct seq_oss_readq *q)
91 q->head = q->tail = 0;
93 /* if someone sleeping, wake'em up */
94 wake_up(&q->midi_sleep);
95 q->input_time = (unsigned long)-1;
102 snd_seq_oss_readq_puts(struct seq_oss_readq *q, int dev, unsigned char *data, int len)
107 memset(&rec, 0, sizeof(rec));
108 rec.c[0] = SEQ_MIDIPUTC;
113 result = snd_seq_oss_readq_put_event(q, &rec);
121 * put MIDI sysex bytes; the event buffer may be chained, thus it has
122 * to be expanded via snd_seq_dump_var_event().
124 struct readq_sysex_ctx {
125 struct seq_oss_readq *readq;
129 static int readq_dump_sysex(void *ptr, void *buf, int count)
131 struct readq_sysex_ctx *ctx = ptr;
133 return snd_seq_oss_readq_puts(ctx->readq, ctx->dev, buf, count);
136 int snd_seq_oss_readq_sysex(struct seq_oss_readq *q, int dev,
137 struct snd_seq_event *ev)
139 struct readq_sysex_ctx ctx = {
144 if ((ev->flags & SNDRV_SEQ_EVENT_LENGTH_MASK) != SNDRV_SEQ_EVENT_LENGTH_VARIABLE)
146 return snd_seq_dump_var_event(ev, readq_dump_sysex, &ctx);
150 * copy an event to input queue:
151 * return zero if enqueued
154 snd_seq_oss_readq_put_event(struct seq_oss_readq *q, union evrec *ev)
158 spin_lock_irqsave(&q->lock, flags);
159 if (q->qlen >= q->maxlen - 1) {
160 spin_unlock_irqrestore(&q->lock, flags);
164 memcpy(&q->q[q->tail], ev, sizeof(*ev));
165 q->tail = (q->tail + 1) % q->maxlen;
168 /* wake up sleeper */
169 wake_up(&q->midi_sleep);
171 spin_unlock_irqrestore(&q->lock, flags);
179 * caller must hold lock
182 snd_seq_oss_readq_pick(struct seq_oss_readq *q, union evrec *rec)
186 memcpy(rec, &q->q[q->head], sizeof(*rec));
194 snd_seq_oss_readq_wait(struct seq_oss_readq *q)
196 wait_event_interruptible_timeout(q->midi_sleep,
197 (q->qlen > 0 || q->head == q->tail),
198 q->pre_event_timeout);
203 * caller must hold lock
206 snd_seq_oss_readq_free(struct seq_oss_readq *q)
209 q->head = (q->head + 1) % q->maxlen;
216 * return non-zero if readq is not empty.
219 snd_seq_oss_readq_poll(struct seq_oss_readq *q, struct file *file, poll_table *wait)
221 poll_wait(file, &q->midi_sleep, wait);
229 snd_seq_oss_readq_put_timestamp(struct seq_oss_readq *q, unsigned long curt, int seq_mode)
231 if (curt != q->input_time) {
233 memset(&rec, 0, sizeof(rec));
235 case SNDRV_SEQ_OSS_MODE_SYNTH:
236 rec.echo = (curt << 8) | SEQ_WAIT;
237 snd_seq_oss_readq_put_event(q, &rec);
239 case SNDRV_SEQ_OSS_MODE_MUSIC:
240 rec.t.code = EV_TIMING;
241 rec.t.cmd = TMR_WAIT_ABS;
243 snd_seq_oss_readq_put_event(q, &rec);
246 q->input_time = curt;
252 #ifdef CONFIG_SND_PROC_FS
257 snd_seq_oss_readq_info_read(struct seq_oss_readq *q, struct snd_info_buffer *buf)
259 snd_iprintf(buf, " read queue [%s] length = %d : tick = %ld\n",
260 (waitqueue_active(&q->midi_sleep) ? "sleeping":"running"),
261 q->qlen, q->input_time);
263 #endif /* CONFIG_SND_PROC_FS */