Linux-2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

sound/core/pcm_timer.c

@@ -0,0 +1,161 @@
+/*
+ *  Digital Audio (PCM) abstract layer
+ *  Copyright (c) by Jaroslav Kysela <perex@suse.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 <sound/driver.h>
+#include <linux/time.h>
+#include <sound/core.h>
+#include <sound/pcm.h>
+#include <sound/timer.h>
+
+/*
+ *  Timer functions
+ */
+
+/* Greatest common divisor */
+static unsigned long gcd(unsigned long a, unsigned long b)
+{
+	unsigned long r;
+	if (a < b) {
+		r = a;
+		a = b;
+		b = r;
+	}
+	while ((r = a % b) != 0) {
+		a = b;
+		b = r;
+	}
+	return b;
+}
+
+void snd_pcm_timer_resolution_change(snd_pcm_substream_t *substream)
+{
+	unsigned long rate, mult, fsize, l, post;
+	snd_pcm_runtime_t *runtime = substream->runtime;
+	
+        mult = 1000000000;
+	rate = runtime->rate;
+	snd_assert(rate != 0, return);
+	l = gcd(mult, rate);
+	mult /= l;
+	rate /= l;
+	fsize = runtime->period_size;
+	snd_assert(fsize != 0, return);
+	l = gcd(rate, fsize);
+	rate /= l;
+	fsize /= l;
+	post = 1;
+	while ((mult * fsize) / fsize != mult) {
+		mult /= 2;
+		post *= 2;
+	}
+	if (rate == 0) {
+		snd_printk(KERN_ERR "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(snd_timer_t * timer)
+{
+	snd_pcm_substream_t * substream;
+	
+	substream = timer->private_data;
+	return substream->runtime ? substream->runtime->timer_resolution : 0;
+}
+
+static int snd_pcm_timer_start(snd_timer_t * timer)
+{
+	unsigned long flags;
+	snd_pcm_substream_t * substream;
+	
+	substream = snd_timer_chip(timer);
+	spin_lock_irqsave(&substream->timer_lock, flags);
+	substream->timer_running = 1;
+	spin_unlock_irqrestore(&substream->timer_lock, flags);
+	return 0;
+}
+
+static int snd_pcm_timer_stop(snd_timer_t * timer)
+{
+	unsigned long flags;
+	snd_pcm_substream_t * substream;
+	
+	substream = snd_timer_chip(timer);
+	spin_lock_irqsave(&substream->timer_lock, flags);
+	substream->timer_running = 0;
+	spin_unlock_irqrestore(&substream->timer_lock, flags);
+	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(snd_timer_t *timer)
+{
+	snd_pcm_substream_t *substream = timer->private_data;
+	substream->timer = NULL;
+}
+
+void snd_pcm_timer_init(snd_pcm_substream_t *substream)
+{
+	snd_timer_id_t tid;
+	snd_timer_t *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(snd_pcm_substream_t *substream)
+{
+	if (substream->timer) {
+		snd_device_free(substream->pcm->card, substream->timer);
+		substream->timer = NULL;
+	}
+}