Linux-2.6.12-rc2v2.6.12-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!

1 files changed, 2612 insertions, 0 deletions

diff --git a/sound/core/pcm_lib.c b/sound/core/pcm_lib.c
new file mode 100644
index 00000000000..151fd99ca2c
--- /dev/null
+++ b/sound/core/pcm_lib.c
@@ -0,0 +1,2612 @@
+/*
+ *  Digital Audio (PCM) abstract layer
+ *  Copyright (c) by Jaroslav Kysela <perex@suse.cz>
+ *                   Abramo Bagnara <abramo@alsa-project.org>
+ *
+ *
+ *   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/slab.h>
+#include <linux/time.h>
+#include <sound/core.h>
+#include <sound/control.h>
+#include <sound/info.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+#include <sound/timer.h>
+
+/*
+ * fill ring buffer with silence
+ * runtime->silence_start: starting pointer to silence area
+ * runtime->silence_filled: size filled with silence
+ * runtime->silence_threshold: threshold from application
+ * runtime->silence_size: maximal size from application
+ *
+ * when runtime->silence_size >= runtime->boundary - fill processed area with silence immediately
+ */
+void snd_pcm_playback_silence(snd_pcm_substream_t *substream, snd_pcm_uframes_t new_hw_ptr)
+{
+	snd_pcm_runtime_t *runtime = substream->runtime;
+	snd_pcm_uframes_t frames, ofs, transfer;
+
+	if (runtime->silence_size < runtime->boundary) {
+		snd_pcm_sframes_t noise_dist, n;
+		if (runtime->silence_start != runtime->control->appl_ptr) {
+			n = runtime->control->appl_ptr - runtime->silence_start;
+			if (n < 0)
+				n += runtime->boundary;
+			if ((snd_pcm_uframes_t)n < runtime->silence_filled)
+				runtime->silence_filled -= n;
+			else
+				runtime->silence_filled = 0;
+			runtime->silence_start = runtime->control->appl_ptr;
+		}
+		if (runtime->silence_filled == runtime->buffer_size)
+			return;
+		snd_assert(runtime->silence_filled <= runtime->buffer_size, return);
+		noise_dist = snd_pcm_playback_hw_avail(runtime) + runtime->silence_filled;
+		if (noise_dist >= (snd_pcm_sframes_t) runtime->silence_threshold)
+			return;
+		frames = runtime->silence_threshold - noise_dist;
+		if (frames > runtime->silence_size)
+			frames = runtime->silence_size;
+	} else {
+		if (new_hw_ptr == ULONG_MAX) {	/* initialization */
+			snd_pcm_sframes_t avail = snd_pcm_playback_hw_avail(runtime);
+			runtime->silence_filled = avail > 0 ? avail : 0;
+			runtime->silence_start = (runtime->status->hw_ptr +
+						  runtime->silence_filled) %
+						 runtime->boundary;
+		} else {
+			ofs = runtime->status->hw_ptr;
+			frames = new_hw_ptr - ofs;
+			if ((snd_pcm_sframes_t)frames < 0)
+				frames += runtime->boundary;
+			runtime->silence_filled -= frames;
+			if ((snd_pcm_sframes_t)runtime->silence_filled < 0) {
+				runtime->silence_filled = 0;
+				runtime->silence_start = (ofs + frames) - runtime->buffer_size;
+			} else {
+				runtime->silence_start = ofs - runtime->silence_filled;
+			}
+			if ((snd_pcm_sframes_t)runtime->silence_start < 0)
+				runtime->silence_start += runtime->boundary;
+		}
+		frames = runtime->buffer_size - runtime->silence_filled;
+	}
+	snd_assert(frames <= runtime->buffer_size, return);
+	if (frames == 0)
+		return;
+	ofs = (runtime->silence_start + runtime->silence_filled) % runtime->buffer_size;
+	while (frames > 0) {
+		transfer = ofs + frames > runtime->buffer_size ? runtime->buffer_size - ofs : frames;
+		if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED ||
+		    runtime->access == SNDRV_PCM_ACCESS_MMAP_INTERLEAVED) {
+			if (substream->ops->silence) {
+				int err;
+				err = substream->ops->silence(substream, -1, ofs, transfer);
+				snd_assert(err >= 0, );
+			} else {
+				char *hwbuf = runtime->dma_area + frames_to_bytes(runtime, ofs);
+				snd_pcm_format_set_silence(runtime->format, hwbuf, transfer * runtime->channels);
+			}
+		} else {
+			unsigned int c;
+			unsigned int channels = runtime->channels;
+			if (substream->ops->silence) {
+				for (c = 0; c < channels; ++c) {
+					int err;
+					err = substream->ops->silence(substream, c, ofs, transfer);
+					snd_assert(err >= 0, );
+				}
+			} else {
+				size_t dma_csize = runtime->dma_bytes / channels;
+				for (c = 0; c < channels; ++c) {
+					char *hwbuf = runtime->dma_area + (c * dma_csize) + samples_to_bytes(runtime, ofs);
+					snd_pcm_format_set_silence(runtime->format, hwbuf, transfer);
+				}
+			}
+		}
+		runtime->silence_filled += transfer;
+		frames -= transfer;
+		ofs = 0;
+	}
+}
+
+static void xrun(snd_pcm_substream_t *substream)
+{
+	snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
+#ifdef CONFIG_SND_DEBUG
+	if (substream->pstr->xrun_debug) {
+		snd_printd(KERN_DEBUG "XRUN: pcmC%dD%d%c\n",
+			   substream->pcm->card->number,
+			   substream->pcm->device,
+			   substream->stream ? 'c' : 'p');
+		if (substream->pstr->xrun_debug > 1)
+			dump_stack();
+	}
+#endif
+}
+
+static inline snd_pcm_uframes_t snd_pcm_update_hw_ptr_pos(snd_pcm_substream_t *substream,
+							  snd_pcm_runtime_t *runtime)
+{
+	snd_pcm_uframes_t pos;
+
+	pos = substream->ops->pointer(substream);
+	if (pos == SNDRV_PCM_POS_XRUN)
+		return pos; /* XRUN */
+	if (runtime->tstamp_mode & SNDRV_PCM_TSTAMP_MMAP)
+		snd_timestamp_now((snd_timestamp_t*)&runtime->status->tstamp, runtime->tstamp_timespec);
+#ifdef CONFIG_SND_DEBUG
+	if (pos >= runtime->buffer_size) {
+		snd_printk(KERN_ERR  "BUG: stream = %i, pos = 0x%lx, buffer size = 0x%lx, period size = 0x%lx\n", substream->stream, pos, runtime->buffer_size, runtime->period_size);
+	} else
+#endif
+	snd_runtime_check(pos < runtime->buffer_size, return 0);
+	pos -= pos % runtime->min_align;
+	return pos;
+}
+
+static inline int snd_pcm_update_hw_ptr_post(snd_pcm_substream_t *substream,
+					     snd_pcm_runtime_t *runtime)
+{
+	snd_pcm_uframes_t avail;
+
+	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
+		avail = snd_pcm_playback_avail(runtime);
+	else
+		avail = snd_pcm_capture_avail(runtime);
+	if (avail > runtime->avail_max)
+		runtime->avail_max = avail;
+	if (avail >= runtime->stop_threshold) {
+		if (substream->runtime->status->state == SNDRV_PCM_STATE_DRAINING)
+			snd_pcm_drain_done(substream);
+		else
+			xrun(substream);
+		return -EPIPE;
+	}
+	if (avail >= runtime->control->avail_min)
+		wake_up(&runtime->sleep);
+	return 0;
+}
+
+static inline int snd_pcm_update_hw_ptr_interrupt(snd_pcm_substream_t *substream)
+{
+	snd_pcm_runtime_t *runtime = substream->runtime;
+	snd_pcm_uframes_t pos;
+	snd_pcm_uframes_t new_hw_ptr, hw_ptr_interrupt;
+	snd_pcm_sframes_t delta;
+
+	pos = snd_pcm_update_hw_ptr_pos(substream, runtime);
+	if (pos == SNDRV_PCM_POS_XRUN) {
+		xrun(substream);
+		return -EPIPE;
+	}
+	if (runtime->period_size == runtime->buffer_size)
+		goto __next_buf;
+	new_hw_ptr = runtime->hw_ptr_base + pos;
+	hw_ptr_interrupt = runtime->hw_ptr_interrupt + runtime->period_size;
+
+	delta = hw_ptr_interrupt - new_hw_ptr;
+	if (delta > 0) {
+		if ((snd_pcm_uframes_t)delta < runtime->buffer_size / 2) {
+#ifdef CONFIG_SND_DEBUG
+			if (runtime->periods > 1 && substream->pstr->xrun_debug) {
+				snd_printd(KERN_ERR "Unexpected hw_pointer value [1] (stream = %i, delta: -%ld, max jitter = %ld): wrong interrupt acknowledge?\n", substream->stream, (long) delta, runtime->buffer_size / 2);
+				if (substream->pstr->xrun_debug > 1)
+					dump_stack();
+			}
+#endif
+			return 0;
+		}
+	      __next_buf:
+		runtime->hw_ptr_base += runtime->buffer_size;
+		if (runtime->hw_ptr_base == runtime->boundary)
+			runtime->hw_ptr_base = 0;
+		new_hw_ptr = runtime->hw_ptr_base + pos;
+	}
+
+	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
+	    runtime->silence_size > 0)
+		snd_pcm_playback_silence(substream, new_hw_ptr);
+
+	runtime->status->hw_ptr = new_hw_ptr;
+	runtime->hw_ptr_interrupt = new_hw_ptr - new_hw_ptr % runtime->period_size;
+
+	return snd_pcm_update_hw_ptr_post(substream, runtime);
+}
+
+/* CAUTION: call it with irq disabled */
+int snd_pcm_update_hw_ptr(snd_pcm_substream_t *substream)
+{
+	snd_pcm_runtime_t *runtime = substream->runtime;
+	snd_pcm_uframes_t pos;
+	snd_pcm_uframes_t old_hw_ptr, new_hw_ptr;
+	snd_pcm_sframes_t delta;
+
+	old_hw_ptr = runtime->status->hw_ptr;
+	pos = snd_pcm_update_hw_ptr_pos(substream, runtime);
+	if (pos == SNDRV_PCM_POS_XRUN) {
+		xrun(substream);
+		return -EPIPE;
+	}
+	new_hw_ptr = runtime->hw_ptr_base + pos;
+
+	delta = old_hw_ptr - new_hw_ptr;
+	if (delta > 0) {
+		if ((snd_pcm_uframes_t)delta < runtime->buffer_size / 2) {
+#ifdef CONFIG_SND_DEBUG
+			if (runtime->periods > 2 && substream->pstr->xrun_debug) {
+				snd_printd(KERN_ERR "Unexpected hw_pointer value [2] (stream = %i, delta: -%ld, max jitter = %ld): wrong interrupt acknowledge?\n", substream->stream, (long) delta, runtime->buffer_size / 2);
+				if (substream->pstr->xrun_debug > 1)
+					dump_stack();
+			}
+#endif
+			return 0;
+		}
+		runtime->hw_ptr_base += runtime->buffer_size;
+		if (runtime->hw_ptr_base == runtime->boundary)
+			runtime->hw_ptr_base = 0;
+		new_hw_ptr = runtime->hw_ptr_base + pos;
+	}
+	if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
+	    runtime->silence_size > 0)
+		snd_pcm_playback_silence(substream, new_hw_ptr);
+
+	runtime->status->hw_ptr = new_hw_ptr;
+
+	return snd_pcm_update_hw_ptr_post(substream, runtime);
+}
+
+/**
+ * snd_pcm_set_ops - set the PCM operators
+ * @pcm: the pcm instance
+ * @direction: stream direction, SNDRV_PCM_STREAM_XXX
+ * @ops: the operator table
+ *
+ * Sets the given PCM operators to the pcm instance.
+ */
+void snd_pcm_set_ops(snd_pcm_t *pcm, int direction, snd_pcm_ops_t *ops)
+{
+	snd_pcm_str_t *stream = &pcm->streams[direction];
+	snd_pcm_substream_t *substream;
+	
+	for (substream = stream->substream; substream != NULL; substream = substream->next)
+		substream->ops = ops;
+}
+
+
+/**
+ * snd_pcm_sync - set the PCM sync id
+ * @substream: the pcm substream
+ *
+ * Sets the PCM sync identifier for the card.
+ */
+void snd_pcm_set_sync(snd_pcm_substream_t * substream)
+{
+	snd_pcm_runtime_t *runtime = substream->runtime;
+	
+	runtime->sync.id32[0] = substream->pcm->card->number;
+	runtime->sync.id32[1] = -1;
+	runtime->sync.id32[2] = -1;
+	runtime->sync.id32[3] = -1;
+}
+
+/*
+ *  Standard ioctl routine
+ */
+
+/* Code taken from alsa-lib */
+#define assert(a) snd_assert((a), return -EINVAL)
+
+static inline unsigned int div32(unsigned int a, unsigned int b, 
+				 unsigned int *r)
+{
+	if (b == 0) {
+		*r = 0;
+		return UINT_MAX;
+	}
+	*r = a % b;
+	return a / b;
+}
+
+static inline unsigned int div_down(unsigned int a, unsigned int b)
+{
+	if (b == 0)
+		return UINT_MAX;
+	return a / b;
+}
+
+static inline unsigned int div_up(unsigned int a, unsigned int b)
+{
+	unsigned int r;
+	unsigned int q;
+	if (b == 0)
+		return UINT_MAX;
+	q = div32(a, b, &r);
+	if (r)
+		++q;
+	return q;
+}
+
+static inline unsigned int mul(unsigned int a, unsigned int b)
+{
+	if (a == 0)
+		return 0;
+	if (div_down(UINT_MAX, a) < b)
+		return UINT_MAX;
+	return a * b;
+}
+
+static inline unsigned int muldiv32(unsigned int a, unsigned int b,
+				    unsigned int c, unsigned int *r)
+{
+	u_int64_t n = (u_int64_t) a * b;
+	if (c == 0) {
+		snd_assert(n > 0, );
+		*r = 0;
+		return UINT_MAX;
+	}
+	div64_32(&n, c, r);
+	if (n >= UINT_MAX) {
+		*r = 0;
+		return UINT_MAX;
+	}
+	return n;
+}
+
+static int snd_interval_refine_min(snd_interval_t *i, unsigned int min, int openmin)
+{
+	int changed = 0;
+	assert(!snd_interval_empty(i));
+	if (i->min < min) {
+		i->min = min;
+		i->openmin = openmin;
+		changed = 1;
+	} else if (i->min == min && !i->openmin && openmin) {
+		i->openmin = 1;
+		changed = 1;
+	}
+	if (i->integer) {
+		if (i->openmin) {
+			i->min++;
+			i->openmin = 0;
+		}
+	}
+	if (snd_interval_checkempty(i)) {
+		snd_interval_none(i);
+		return -EINVAL;
+	}
+	return changed;
+}
+
+static int snd_interval_refine_max(snd_interval_t *i, unsigned int max, int openmax)
+{
+	int changed = 0;
+	assert(!snd_interval_empty(i));
+	if (i->max > max) {
+		i->max = max;
+		i->openmax = openmax;
+		changed = 1;
+	} else if (i->max == max && !i->openmax && openmax) {
+		i->openmax = 1;
+		changed = 1;
+	}
+	if (i->integer) {
+		if (i->openmax) {
+			i->max--;
+			i->openmax = 0;
+		}
+	}
+	if (snd_interval_checkempty(i)) {
+		snd_interval_none(i);
+		return -EINVAL;
+	}
+	return changed;
+}
+
+/**
+ * snd_interval_refine - refine the interval value of configurator
+ * @i: the interval value to refine
+ * @v: the interval value to refer to
+ *
+ * Refines the interval value with the reference value.
+ * The interval is changed to the range satisfying both intervals.
+ * The interval status (min, max, integer, etc.) are evaluated.
+ *
+ * Returns non-zero if the value is changed, zero if not changed.
+ */
+int snd_interval_refine(snd_interval_t *i, const snd_interval_t *v)
+{
+	int changed = 0;
+	assert(!snd_interval_empty(i));
+	if (i->min < v->min) {
+		i->min = v->min;
+		i->openmin = v->openmin;
+		changed = 1;
+	} else if (i->min == v->min && !i->openmin && v->openmin) {
+		i->openmin = 1;
+		changed = 1;
+	}
+	if (i->max > v->max) {
+		i->max = v->max;
+		i->openmax = v->openmax;
+		changed = 1;
+	} else if (i->max == v->max && !i->openmax && v->openmax) {
+		i->openmax = 1;
+		changed = 1;
+	}
+	if (!i->integer && v->integer) {
+		i->integer = 1;
+		changed = 1;
+	}
+	if (i->integer) {
+		if (i->openmin) {
+			i->min++;
+			i->openmin = 0;
+		}
+		if (i->openmax) {
+			i->max--;
+			i->openmax = 0;
+		}
+	} else if (!i->openmin && !i->openmax && i->min == i->max)
+		i->integer = 1;
+	if (snd_interval_checkempty(i)) {
+		snd_interval_none(i);
+		return -EINVAL;
+	}
+	return changed;
+}
+
+static int snd_interval_refine_first(snd_interval_t *i)
+{
+	assert(!snd_interval_empty(i));
+	if (snd_interval_single(i))
+		return 0;
+	i->max = i->min;
+	i->openmax = i->openmin;
+	if (i->openmax)
+		i->max++;
+	return 1;
+}
+
+static int snd_interval_refine_last(snd_interval_t *i)
+{
+	assert(!snd_interval_empty(i));
+	if (snd_interval_single(i))
+		return 0;
+	i->min = i->max;
+	i->openmin = i->openmax;
+	if (i->openmin)
+		i->min--;
+	return 1;
+}
+
+static int snd_interval_refine_set(snd_interval_t *i, unsigned int val)
+{
+	snd_interval_t t;
+	t.empty = 0;
+	t.min = t.max = val;
+	t.openmin = t.openmax = 0;
+	t.integer = 1;
+	return snd_interval_refine(i, &t);
+}
+
+void snd_interval_mul(const snd_interval_t *a, const snd_interval_t *b, snd_interval_t *c)
+{
+	if (a->empty || b->empty) {
+		snd_interval_none(c);
+		return;
+	}
+	c->empty = 0;
+	c->min = mul(a->min, b->min);
+	c->openmin = (a->openmin || b->openmin);
+	c->max = mul(a->max,  b->max);
+	c->openmax = (a->openmax || b->openmax);
+	c->integer = (a->integer && b->integer);
+}
+
+/**
+ * snd_interval_div - refine the interval value with division
+ *
+ * c = a / b
+ *
+ * Returns non-zero if the value is changed, zero if not changed.
+ */
+void snd_interval_div(const snd_interval_t *a, const snd_interval_t *b, snd_interval_t *c)
+{
+	unsigned int r;
+	if (a->empty || b->empty) {
+		snd_interval_none(c);
+		return;
+	}
+	c->empty = 0;
+	c->min = div32(a->min, b->max, &r);
+	c->openmin = (r || a->openmin || b->openmax);
+	if (b->min > 0) {
+		c->max = div32(a->max, b->min, &r);
+		if (r) {
+			c->max++;
+			c->openmax = 1;
+		} else
+			c->openmax = (a->openmax || b->openmin);
+	} else {
+		c->max = UINT_MAX;
+		c->openmax = 0;
+	}
+	c->integer = 0;
+}
+
+/**
+ * snd_interval_muldivk - refine the interval value
+ *
+ * c = a * b / k
+ *
+ * Returns non-zero if the value is changed, zero if not changed.
+ */
+void snd_interval_muldivk(const snd_interval_t *a, const snd_interval_t *b,
+		      unsigned int k, snd_interval_t *c)
+{
+	unsigned int r;
+	if (a->empty || b->empty) {
+		snd_interval_none(c);
+		return;
+	}
+	c->empty = 0;
+	c->min = muldiv32(a->min, b->min, k, &r);
+	c->openmin = (r || a->openmin || b->openmin);
+	c->max = muldiv32(a->max, b->max, k, &r);
+	if (r) {
+		c->max++;
+		c->openmax = 1;
+	} else
+		c->openmax = (a->openmax || b->openmax);
+	c->integer = 0;
+}
+
+/**
+ * snd_interval_mulkdiv - refine the interval value
+ *
+ * c = a * k / b
+ *
+ * Returns non-zero if the value is changed, zero if not changed.
+ */
+void snd_interval_mulkdiv(const snd_interval_t *a, unsigned int k,
+		      const snd_interval_t *b, snd_interval_t *c)
+{
+	unsigned int r;
+	if (a->empty || b->empty) {
+		snd_interval_none(c);
+		return;
+	}
+	c->empty = 0;
+	c->min = muldiv32(a->min, k, b->max, &r);
+	c->openmin = (r || a->openmin || b->openmax);
+	if (b->min > 0) {
+		c->max = muldiv32(a->max, k, b->min, &r);
+		if (r) {
+			c->max++;
+			c->openmax = 1;
+		} else
+			c->openmax = (a->openmax || b->openmin);
+	} else {
+		c->max = UINT_MAX;
+		c->openmax = 0;
+	}
+	c->integer = 0;
+}
+
+#undef assert
+/* ---- */
+
+
+/**
+ * snd_interval_ratnum - refine the interval value
+ *
+ * Returns non-zero if the value is changed, zero if not changed.
+ */
+int snd_interval_ratnum(snd_interval_t *i,
+		    unsigned int rats_count, ratnum_t *rats,
+		    unsigned int *nump, unsigned int *denp)
+{
+	unsigned int best_num, best_diff, best_den;
+	unsigned int k;
+	snd_interval_t t;
+	int err;
+
+	best_num = best_den = best_diff = 0;
+	for (k = 0; k < rats_count; ++k) {
+		unsigned int num = rats[k].num;
+		unsigned int den;
+		unsigned int q = i->min;
+		int diff;
+		if (q == 0)
+			q = 1;
+		den = div_down(num, q);
+		if (den < rats[k].den_min)
+			continue;
+		if (den > rats[k].den_max)
+			den = rats[k].den_max;
+		else {
+			unsigned int r;
+			r = (den - rats[k].den_min) % rats[k].den_step;
+			if (r != 0)
+				den -= r;
+		}
+		diff = num - q * den;
+		if (best_num == 0 ||
+		    diff * best_den < best_diff * den) {
+			best_diff = diff;
+			best_den = den;
+			best_num = num;
+		}
+	}
+	if (best_den == 0) {
+		i->empty = 1;
+		return -EINVAL;
+	}
+	t.min = div_down(best_num, best_den);
+	t.openmin = !!(best_num % best_den);
+	
+	best_num = best_den = best_diff = 0;
+	for (k = 0; k < rats_count; ++k) {
+		unsigned int num = rats[k].num;
+		unsigned int den;
+		unsigned int q = i->max;
+		int diff;
+		if (q == 0) {
+			i->empty = 1;
+			return -EINVAL;
+		}
+		den = div_up(num, q);
+		if (den > rats[k].den_max)
+			continue;
+		if (den < rats[k].den_min)
+			den = rats[k].den_min;
+		else {
+			unsigned int r;
+			r = (den - rats[k].den_min) % rats[k].den_step;
+			if (r != 0)
+				den += rats[k].den_step - r;
+		}
+		diff = q * den - num;
+		if (best_num == 0 ||
+		    diff * best_den < best_diff * den) {
+			best_diff = diff;
+			best_den = den;
+			best_num = num;
+		}
+	}
+	if (best_den == 0) {
+		i->empty = 1;
+		return -EINVAL;
+	}
+	t.max = div_up(best_num, best_den);
+	t.openmax = !!(best_num % best_den);
+	t.integer = 0;
+	err = snd_interval_refine(i, &t);
+	if (err < 0)
+		return err;
+
+	if (snd_interval_single(i)) {
+		if (nump)
+			*nump = best_num;
+		if (denp)
+			*denp = best_den;
+	}
+	return err;
+}
+
+/**
+ * snd_interval_ratden - refine the interval value
+ *
+ * Returns non-zero if the value is changed, zero if not changed.
+ */
+static int snd_interval_ratden(snd_interval_t *i,
+			       unsigned int rats_count, ratden_t *rats,
+			       unsigned int *nump, unsigned int *denp)
+{
+	unsigned int best_num, best_diff, best_den;
+	unsigned int k;
+	snd_interval_t t;
+	int err;
+
+	best_num = best_den = best_diff = 0;
+	for (k = 0; k < rats_count; ++k) {
+		unsigned int num;
+		unsigned int den = rats[k].den;
+		unsigned int q = i->min;
+		int diff;
+		num = mul(q, den);
+		if (num > rats[k].num_max)
+			continue;
+		if (num < rats[k].num_min)
+			num = rats[k].num_max;
+		else {
+			unsigned int r;
+			r = (num - rats[k].num_min) % rats[k].num_step;
+			if (r != 0)
+				num += rats[k].num_step - r;
+		}
+		diff = num - q * den;
+		if (best_num == 0 ||
+		    diff * best_den < best_diff * den) {
+			best_diff = diff;
+			best_den = den;
+			best_num = num;
+		}
+	}
+	if (best_den == 0) {
+		i->empty = 1;
+		return -EINVAL;
+	}
+	t.min = div_down(best_num, best_den);
+	t.openmin = !!(best_num % best_den);
+	
+	best_num = best_den = best_diff = 0;
+	for (k = 0; k < rats_count; ++k) {
+		unsigned int num;
+		unsigned int den = rats[k].den;
+		unsigned int q = i->max;
+		int diff;
+		num = mul(q, den);
+		if (num < rats[k].num_min)
+			continue;
+		if (num > rats[k].num_max)
+			num = rats[k].num_max;
+		else {
+			unsigned int r;
+			r = (num - rats[k].num_min) % rats[k].num_step;
+			if (r != 0)
+				num -= r;
+		}
+		diff = q * den - num;
+		if (best_num == 0 ||
+		    diff * best_den < best_diff * den) {
+			best_diff = diff;
+			best_den = den;
+			best_num = num;
+		}
+	}
+	if (best_den == 0) {
+		i->empty = 1;
+		return -EINVAL;
+	}
+	t.max = div_up(best_num, best_den);
+	t.openmax = !!(best_num % best_den);
+	t.integer = 0;
+	err = snd_interval_refine(i, &t);
+	if (err < 0)
+		return err;
+
+	if (snd_interval_single(i)) {
+		if (nump)
+			*nump = best_num;
+		if (denp)
+			*denp = best_den;
+	}
+	return err;
+}
+
+/**
+ * snd_interval_list - refine the interval value from the list
+ * @i: the interval value to refine
+ * @count: the number of elements in the list
+ * @list: the value list
+ * @mask: the bit-mask to evaluate
+ *
+ * Refines the interval value from the list.
+ * When mask is non-zero, only the elements corresponding to bit 1 are
+ * evaluated.
+ *
+ * Returns non-zero if the value is changed, zero if not changed.
+ */
+int snd_interval_list(snd_interval_t *i, unsigned int count, unsigned int *list, unsigned int mask)
+{
+        unsigned int k;
+	int changed = 0;
+        for (k = 0; k < count; k++) {
+		if (mask && !(mask & (1 << k)))
+			continue;
+                if (i->min == list[k] && !i->openmin)
+                        goto _l1;
+                if (i->min < list[k]) {
+                        i->min = list[k];
+			i->openmin = 0;
+			changed = 1;
+                        goto _l1;
+                }
+        }
+        i->empty = 1;
+        return -EINVAL;
+ _l1:
+        for (k = count; k-- > 0;) {
+		if (mask && !(mask & (1 << k)))
+			continue;
+                if (i->max == list[k] && !i->openmax)
+                        goto _l2;
+                if (i->max > list[k]) {
+                        i->max = list[k];
+			i->openmax = 0;
+			changed = 1;
+                        goto _l2;
+                }
+        }
+        i->empty = 1;
+        return -EINVAL;
+ _l2:
+	if (snd_interval_checkempty(i)) {
+		i->empty = 1;
+		return -EINVAL;
+	}
+        return changed;
+}
+
+static int snd_interval_step(snd_interval_t *i, unsigned int min, unsigned int step)
+{
+	unsigned int n;
+	int changed = 0;
+	n = (i->min - min) % step;
+	if (n != 0 || i->openmin) {
+		i->min += step - n;
+		changed = 1;
+	}
+	n = (i->max - min) % step;
+	if (n != 0 || i->openmax) {
+		i->max -= n;
+		changed = 1;
+	}
+	if (snd_interval_checkempty(i)) {
+		i->empty = 1;
+		return -EINVAL;
+	}
+	return changed;
+}
+
+/* Info constraints helpers */
+
+/**
+ * snd_pcm_hw_rule_add - add the hw-constraint rule
+ * @runtime: the pcm runtime instance
+ * @cond: condition bits
+ * @var: the variable to evaluate
+ * @func: the evaluation function
+ * @private: the private data pointer passed to function
+ * @dep: the dependent variables
+ *
+ * Returns zero if successful, or a negative error code on failure.
+ */
+int snd_pcm_hw_rule_add(snd_pcm_runtime_t *runtime, unsigned int cond,
+			int var,
+			snd_pcm_hw_rule_func_t func, void *private,
+			int dep, ...)
+{
+	snd_pcm_hw_constraints_t *constrs = &runtime->hw_constraints;
+	snd_pcm_hw_rule_t *c;
+	unsigned int k;
+	va_list args;
+	va_start(args, dep);
+	if (constrs->rules_num >= constrs->rules_all) {
+		snd_pcm_hw_rule_t *new;
+		unsigned int new_rules = constrs->rules_all + 16;
+		new = kcalloc(new_rules, sizeof(*c), GFP_KERNEL);
+		if (!new)
+			return -ENOMEM;
+		if (constrs->rules) {
+			memcpy(new, constrs->rules,
+			       constrs->rules_num * sizeof(*c));
+			kfree(constrs->rules);
+		}
+		constrs->rules = new;
+		constrs->rules_all = new_rules;
+	}
+	c = &constrs->rules[constrs->rules_num];
+	c->cond = cond;
+	c->func = func;
+	c->var = var;
+	c->private = private;
+	k = 0;
+	while (1) {
+		snd_assert(k < ARRAY_SIZE(c->deps), return -EINVAL);
+		c->deps[k++] = dep;
+		if (dep < 0)
+			break;
+		dep = va_arg(args, int);
+	}
+	constrs->rules_num++;
+	va_end(args);
+	return 0;
+}				    
+
+/**
+ * snd_pcm_hw_constraint_mask
+ */
+int snd_pcm_hw_constraint_mask(snd_pcm_runtime_t *runtime, snd_pcm_hw_param_t var,
+			       u_int32_t mask)
+{
+	snd_pcm_hw_constraints_t *constrs = &runtime->hw_constraints;
+	snd_mask_t *maskp = constrs_mask(constrs, var);
+	*maskp->bits &= mask;
+	memset(maskp->bits + 1, 0, (SNDRV_MASK_MAX-32) / 8); /* clear rest */
+	if (*maskp->bits == 0)
+		return -EINVAL;
+	return 0;
+}
+
+/**
+ * snd_pcm_hw_constraint_mask64
+ */
+int snd_pcm_hw_constraint_mask64(snd_pcm_runtime_t *runtime, snd_pcm_hw_param_t var,
+				 u_int64_t mask)
+{
+	snd_pcm_hw_constraints_t *constrs = &runtime->hw_constraints;
+	snd_mask_t *maskp = constrs_mask(constrs, var);
+	maskp->bits[0] &= (u_int32_t)mask;
+	maskp->bits[1] &= (u_int32_t)(mask >> 32);
+	memset(maskp->bits + 2, 0, (SNDRV_MASK_MAX-64) / 8); /* clear rest */
+	if (! maskp->bits[0] && ! maskp->bits[1])
+		return -EINVAL;
+	return 0;
+}
+
+/**
+ * snd_pcm_hw_constraint_integer
+ */
+int snd_pcm_hw_constraint_integer(snd_pcm_runtime_t *runtime, snd_pcm_hw_param_t var)
+{
+	snd_pcm_hw_constraints_t *constrs = &runtime->hw_constraints;
+	return snd_interval_setinteger(constrs_interval(constrs, var));
+}
+
+/**
+ * snd_pcm_hw_constraint_minmax
+ */
+int snd_pcm_hw_constraint_minmax(snd_pcm_runtime_t *runtime, snd_pcm_hw_param_t var,
+				 unsigned int min, unsigned int max)
+{
+	snd_pcm_hw_constraints_t *constrs = &runtime->hw_constraints;
+	snd_interval_t t;
+	t.min = min;
+	t.max = max;
+	t.openmin = t.openmax = 0;
+	t.integer = 0;
+	return snd_interval_refine(constrs_interval(constrs, var), &t);
+}
+
+static int snd_pcm_hw_rule_list(snd_pcm_hw_params_t *params,
+				snd_pcm_hw_rule_t *rule)
+{
+	snd_pcm_hw_constraint_list_t *list = rule->private;
+	return snd_interval_list(hw_param_interval(params, rule->var), list->count, list->list, list->mask);
+}		
+
+
+/**
+ * snd_pcm_hw_constraint_list
+ */
+int snd_pcm_hw_constraint_list(snd_pcm_runtime_t *runtime,
+			       unsigned int cond,
+			       snd_pcm_hw_param_t var,
+			       snd_pcm_hw_constraint_list_t *l)
+{
+	return snd_pcm_hw_rule_add(runtime, cond, var,
+				   snd_pcm_hw_rule_list, l,
+				   var, -1);
+}
+
+static int snd_pcm_hw_rule_ratnums(snd_pcm_hw_params_t *params,
+				   snd_pcm_hw_rule_t *rule)
+{
+	snd_pcm_hw_constraint_ratnums_t *r = rule->private;
+	unsigned int num = 0, den = 0;
+	int err;
+	err = snd_interval_ratnum(hw_param_interval(params, rule->var),
+				  r->nrats, r->rats, &num, &den);
+	if (err >= 0 && den && rule->var == SNDRV_PCM_HW_PARAM_RATE) {
+		params->rate_num = num;
+		params->rate_den = den;
+	}
+	return err;
+}
+
+/**
+ * snd_pcm_hw_constraint_ratnums
+ */
+int snd_pcm_hw_constraint_ratnums(snd_pcm_runtime_t *runtime, 
+				  unsigned int cond,
+				  snd_pcm_hw_param_t var,
+				  snd_pcm_hw_constraint_ratnums_t *r)
+{
+	return snd_pcm_hw_rule_add(runtime, cond, var,
+				   snd_pcm_hw_rule_ratnums, r,
+				   var, -1);
+}
+
+static int snd_pcm_hw_rule_ratdens(snd_pcm_hw_params_t *params,
+				   snd_pcm_hw_rule_t *rule)
+{
+	snd_pcm_hw_constraint_ratdens_t *r = rule->private;
+	unsigned int num = 0, den = 0;
+	int err = snd_interval_ratden(hw_param_interval(params, rule->var),
+				  r->nrats, r->rats, &num, &den);
+	if (err >= 0 && den && rule->var == SNDRV_PCM_HW_PARAM_RATE) {
+		params->rate_num = num;
+		params->rate_den = den;
+	}
+	return err;
+}
+
+/**
+ * snd_pcm_hw_constraint_ratdens
+ */
+int snd_pcm_hw_constraint_ratdens(snd_pcm_runtime_t *runtime, 
+				  unsigned int cond,
+				  snd_pcm_hw_param_t var,
+				  snd_pcm_hw_constraint_ratdens_t *r)
+{
+	return snd_pcm_hw_rule_add(runtime, cond, var,
+				   snd_pcm_hw_rule_ratdens, r,
+				   var, -1);
+}
+
+static int snd_pcm_hw_rule_msbits(snd_pcm_hw_params_t *params,
+				  snd_pcm_hw_rule_t *rule)
+{
+	unsigned int l = (unsigned long) rule->private;
+	int width = l & 0xffff;
+	unsigned int msbits = l >> 16;
+	snd_interval_t *i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS);
+	if (snd_interval_single(i) && snd_interval_value(i) == width)
+		params->msbits = msbits;
+	return 0;
+}
+
+/**
+ * snd_pcm_hw_constraint_msbits
+ */
+int snd_pcm_hw_constraint_msbits(snd_pcm_runtime_t *runtime, 
+				 unsigned int cond,
+				 unsigned int width,
+				 unsigned int msbits)
+{
+	unsigned long l = (msbits << 16) | width;
+	return snd_pcm_hw_rule_add(runtime, cond, -1,
+				    snd_pcm_hw_rule_msbits,
+				    (void*) l,
+				    SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
+}
+
+static int snd_pcm_hw_rule_step(snd_pcm_hw_params_t *params,
+				snd_pcm_hw_rule_t *rule)
+{
+	unsigned long step = (unsigned long) rule->private;
+	return snd_interval_step(hw_param_interval(params, rule->var), 0, step);
+}
+
+/**
+ * snd_pcm_hw_constraint_step
+ */
+int snd_pcm_hw_constraint_step(snd_pcm_runtime_t *runtime,
+			       unsigned int cond,
+			       snd_pcm_hw_param_t var,
+			       unsigned long step)
+{
+	return snd_pcm_hw_rule_add(runtime, cond, var, 
+				   snd_pcm_hw_rule_step, (void *) step,
+				   var, -1);
+}
+
+static int snd_pcm_hw_rule_pow2(snd_pcm_hw_params_t *params, snd_pcm_hw_rule_t *rule)
+{
+	static int pow2_sizes[] = {
+		1<<0, 1<<1, 1<<2, 1<<3, 1<<4, 1<<5, 1<<6, 1<<7,
+		1<<8, 1<<9, 1<<10, 1<<11, 1<<12, 1<<13, 1<<14, 1<<15,
+		1<<16, 1<<17, 1<<18, 1<<19, 1<<20, 1<<21, 1<<22, 1<<23,
+		1<<24, 1<<25, 1<<26, 1<<27, 1<<28, 1<<29, 1<<30
+	};
+	return snd_interval_list(hw_param_interval(params, rule->var),
+				 ARRAY_SIZE(pow2_sizes), pow2_sizes, 0);
+}		
+
+/**
+ * snd_pcm_hw_constraint_pow2
+ */
+int snd_pcm_hw_constraint_pow2(snd_pcm_runtime_t *runtime,
+			       unsigned int cond,
+			       snd_pcm_hw_param_t var)
+{
+	return snd_pcm_hw_rule_add(runtime, cond, var, 
+				   snd_pcm_hw_rule_pow2, NULL,
+				   var, -1);
+}
+
+/* To use the same code we have in alsa-lib */
+#define snd_pcm_t snd_pcm_substream_t
+#define assert(i) snd_assert((i), return -EINVAL)
+#ifndef INT_MIN
+#define INT_MIN ((int)((unsigned int)INT_MAX+1))
+#endif
+
+void _snd_pcm_hw_param_any(snd_pcm_hw_params_t *params, snd_pcm_hw_param_t var)
+{
+	if (hw_is_mask(var)) {
+		snd_mask_any(hw_param_mask(params, var));
+		params->cmask |= 1 << var;
+		params->rmask |= 1 << var;
+		return;
+	}
+	if (hw_is_interval(var)) {
+		snd_interval_any(hw_param_interval(params, var));</