Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / sound / core / seq / oss / seq_oss_writeq.c

diff --git a/kernel/sound/core/seq/oss/seq_oss_writeq.c b/kernel/sound/core/seq/oss/seq_oss_writeq.c
new file mode 100644 (file)
index 0000000..d50338b
--- /dev/null
+++ b/kernel/sound/core/seq/oss/seq_oss_writeq.c
@@ -0,0 +1,173 @@
+/*
+ * 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>
+#include <linux/slab.h>
+
+
+/*
+ * create a write queue record
+ */
+struct seq_oss_writeq *
+snd_seq_oss_writeq_new(struct seq_oss_devinfo *dp, int maxlen)
+{
+       struct seq_oss_writeq *q;
+       struct snd_seq_client_pool pool;
+
+       if ((q = kzalloc(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(struct seq_oss_writeq *q)
+{
+       if (q) {
+               snd_seq_oss_writeq_clear(q);    /* to be sure */
+               kfree(q);
+       }
+}
+
+
+/*
+ * reset the write queue
+ */
+void
+snd_seq_oss_writeq_clear(struct seq_oss_writeq *q)
+{
+       struct snd_seq_remove_events 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(struct seq_oss_writeq *q)
+{
+       struct seq_oss_devinfo *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) {
+               struct snd_seq_event ev;
+               union evrec *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 = (union evrec *)&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(struct seq_oss_writeq *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(struct seq_oss_writeq *q)
+{
+       struct snd_seq_client_pool 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(struct seq_oss_writeq *q, int val)
+{
+       struct snd_seq_client_pool 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);
+}
+