Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / sound / core / pcm_timer.c

diff --git a/kernel/sound/core/pcm_timer.c b/kernel/sound/core/pcm_timer.c
new file mode 100644 (file)
index 0000000..20ecd8f
--- /dev/null
+++ b/kernel/sound/core/pcm_timer.c
@@ -0,0 +1,143 @@
+/*
+ *  Digital Audio (PCM) abstract layer
+ *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
+ *
+ *
+ *   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 <linux/time.h>
+#include <linux/gcd.h>
+#include <sound/core.h>
+#include <sound/pcm.h>
+#include <sound/timer.h>
+
+/*
+ *  Timer functions
+ */
+
+void snd_pcm_timer_resolution_change(struct snd_pcm_substream *substream)
+{
+       unsigned long rate, mult, fsize, l, post;
+       struct snd_pcm_runtime *runtime = substream->runtime;
+       
+        mult = 1000000000;
+       rate = runtime->rate;
+       if (snd_BUG_ON(!rate))
+               return;
+       l = gcd(mult, rate);
+       mult /= l;
+       rate /= l;
+       fsize = runtime->period_size;
+       if (snd_BUG_ON(!fsize))
+               return;
+       l = gcd(rate, fsize);
+       rate /= l;
+       fsize /= l;
+       post = 1;
+       while ((mult * fsize) / fsize != mult) {
+               mult /= 2;
+               post *= 2;
+       }
+       if (rate == 0) {
+               pcm_err(substream->pcm,
+                       "pcm timer resolution out of range (rate = %u, period_size = %lu)\n",
+                       runtime->rate, runtime->period_size);
+               runtime->timer_resolution = -1;
+               return;
+       }
+       runtime->timer_resolution = (mult * fsize / rate) * post;
+}
+
+static unsigned long snd_pcm_timer_resolution(struct snd_timer * timer)
+{
+       struct snd_pcm_substream *substream;
+       
+       substream = timer->private_data;
+       return substream->runtime ? substream->runtime->timer_resolution : 0;
+}
+
+static int snd_pcm_timer_start(struct snd_timer * timer)
+{
+       struct snd_pcm_substream *substream;
+       
+       substream = snd_timer_chip(timer);
+       substream->timer_running = 1;
+       return 0;
+}
+
+static int snd_pcm_timer_stop(struct snd_timer * timer)
+{
+       struct snd_pcm_substream *substream;
+       
+       substream = snd_timer_chip(timer);
+       substream->timer_running = 0;
+       return 0;
+}
+
+static struct snd_timer_hardware snd_pcm_timer =
+{
+       .flags =        SNDRV_TIMER_HW_AUTO | SNDRV_TIMER_HW_SLAVE,
+       .resolution =   0,
+       .ticks =        1,
+       .c_resolution = snd_pcm_timer_resolution,
+       .start =        snd_pcm_timer_start,
+       .stop =         snd_pcm_timer_stop,
+};
+
+/*
+ *  Init functions
+ */
+
+static void snd_pcm_timer_free(struct snd_timer *timer)
+{
+       struct snd_pcm_substream *substream = timer->private_data;
+       substream->timer = NULL;
+}
+
+void snd_pcm_timer_init(struct snd_pcm_substream *substream)
+{
+       struct snd_timer_id tid;
+       struct snd_timer *timer;
+       
+       tid.dev_sclass = SNDRV_TIMER_SCLASS_NONE;
+       tid.dev_class = SNDRV_TIMER_CLASS_PCM;
+       tid.card = substream->pcm->card->number;
+       tid.device = substream->pcm->device;
+       tid.subdevice = (substream->number << 1) | (substream->stream & 1);
+       if (snd_timer_new(substream->pcm->card, "PCM", &tid, &timer) < 0)
+               return;
+       sprintf(timer->name, "PCM %s %i-%i-%i",
+                       substream->stream == SNDRV_PCM_STREAM_CAPTURE ?
+                               "capture" : "playback",
+                       tid.card, tid.device, tid.subdevice);
+       timer->hw = snd_pcm_timer;
+       if (snd_device_register(timer->card, timer) < 0) {
+               snd_device_free(timer->card, timer);
+               return;
+       }
+       timer->private_data = substream;
+       timer->private_free = snd_pcm_timer_free;
+       substream->timer = timer;
+}
+
+void snd_pcm_timer_done(struct snd_pcm_substream *substream)
+{
+       if (substream->timer) {
+               snd_device_free(substream->pcm->card, substream->timer);
+               substream->timer = NULL;
+       }
+}