diff options
Diffstat (limited to 'sound/core/seq/oss/seq_oss_writeq.c')
| -rw-r--r-- | sound/core/seq/oss/seq_oss_writeq.c | 170 |
1 files changed, 170 insertions, 0 deletions
diff --git a/sound/core/seq/oss/seq_oss_writeq.c b/sound/core/seq/oss/seq_oss_writeq.c new file mode 100644 index 000000000000..87f85f7ee814 --- /dev/null +++ b/sound/core/seq/oss/seq_oss_writeq.c @@ -0,0 +1,170 @@ +/* + * OSS compatible sequencer driver + * + * seq_oss_writeq.c - write queue and sync + * + * Copyright (C) 1998,99 Takashi Iwai <tiwai@suse.de> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ + +#include "seq_oss_writeq.h" +#include "seq_oss_event.h" +#include "seq_oss_timer.h" +#include <sound/seq_oss_legacy.h> +#include "../seq_lock.h" +#include "../seq_clientmgr.h" +#include <linux/wait.h> + + +/* + * create a write queue record + */ +seq_oss_writeq_t * +snd_seq_oss_writeq_new(seq_oss_devinfo_t *dp, int maxlen) +{ + seq_oss_writeq_t *q; + snd_seq_client_pool_t pool; + + if ((q = kcalloc(1, sizeof(*q), GFP_KERNEL)) == NULL) + return NULL; + q->dp = dp; + q->maxlen = maxlen; + spin_lock_init(&q->sync_lock); + q->sync_event_put = 0; + q->sync_time = 0; + init_waitqueue_head(&q->sync_sleep); + + memset(&pool, 0, sizeof(pool)); + pool.client = dp->cseq; + pool.output_pool = maxlen; + pool.output_room = maxlen / 2; + + snd_seq_oss_control(dp, SNDRV_SEQ_IOCTL_SET_CLIENT_POOL, &pool); + + return q; +} + +/* + * delete the write queue + */ +void +snd_seq_oss_writeq_delete(seq_oss_writeq_t *q) +{ + snd_seq_oss_writeq_clear(q); /* to be sure */ + kfree(q); +} + + +/* + * reset the write queue + */ +void +snd_seq_oss_writeq_clear(seq_oss_writeq_t *q) +{ + snd_seq_remove_events_t reset; + + memset(&reset, 0, sizeof(reset)); + reset.remove_mode = SNDRV_SEQ_REMOVE_OUTPUT; /* remove all */ + snd_seq_oss_control(q->dp, SNDRV_SEQ_IOCTL_REMOVE_EVENTS, &reset); + + /* wake up sleepers if any */ + snd_seq_oss_writeq_wakeup(q, 0); +} + +/* + * wait until the write buffer has enough room + */ +int +snd_seq_oss_writeq_sync(seq_oss_writeq_t *q) +{ + seq_oss_devinfo_t *dp = q->dp; + abstime_t time; + + time = snd_seq_oss_timer_cur_tick(dp->timer); + if (q->sync_time >= time) + return 0; /* already finished */ + + if (! q->sync_event_put) { + snd_seq_event_t ev; + evrec_t *rec; + + /* put echoback event */ + memset(&ev, 0, sizeof(ev)); + ev.flags = 0; + ev.type = SNDRV_SEQ_EVENT_ECHO; + ev.time.tick = time; + /* echo back to itself */ + snd_seq_oss_fill_addr(dp, &ev, dp->addr.client, dp->addr.port); + rec = (evrec_t*)&ev.data; + rec->t.code = SEQ_SYNCTIMER; + rec->t.time = time; + q->sync_event_put = 1; + snd_seq_kernel_client_enqueue_blocking(dp->cseq, &ev, NULL, 0, 0); + } + + wait_event_interruptible_timeout(q->sync_sleep, ! q->sync_event_put, HZ); + if (signal_pending(current)) + /* interrupted - return 0 to finish sync */ + q->sync_event_put = 0; + if (! q->sync_event_put || q->sync_time >= time) + return 0; + return 1; +} + +/* + * wake up sync - echo event was catched + */ +void +snd_seq_oss_writeq_wakeup(seq_oss_writeq_t *q, abstime_t time) +{ + unsigned long flags; + + spin_lock_irqsave(&q->sync_lock, flags); + q->sync_time = time; + q->sync_event_put = 0; + if (waitqueue_active(&q->sync_sleep)) { + wake_up(&q->sync_sleep); + } + spin_unlock_irqrestore(&q->sync_lock, flags); +} + + +/* + * return the unused pool size + */ +int +snd_seq_oss_writeq_get_free_size(seq_oss_writeq_t *q) +{ + snd_seq_client_pool_t pool; + pool.client = q->dp->cseq; + snd_seq_oss_control(q->dp, SNDRV_SEQ_IOCTL_GET_CLIENT_POOL, &pool); + return pool.output_free; +} + + +/* + * set output threshold size from ioctl + */ +void +snd_seq_oss_writeq_set_output(seq_oss_writeq_t *q, int val) +{ + snd_seq_client_pool_t pool; + pool.client = q->dp->cseq; + snd_seq_oss_control(q->dp, SNDRV_SEQ_IOCTL_GET_CLIENT_POOL, &pool); + pool.output_room = val; + snd_seq_oss_control(q->dp, SNDRV_SEQ_IOCTL_SET_CLIENT_POOL, &pool); +} + |