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!
diff --git a/sound/core/pcm_lib.c b/sound/core/pcm_lib.c
new file mode 100644
index 0000000..151fd99
--- /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));
+ params->cmask |= 1 << var;
+ params->rmask |= 1 << var;
+ return;
+ }
+ snd_BUG();
+}
+
+/**
+ * snd_pcm_hw_param_any
+ */
+int snd_pcm_hw_param_any(snd_pcm_t *pcm, snd_pcm_hw_params_t *params,
+ snd_pcm_hw_param_t var)
+{
+ _snd_pcm_hw_param_any(params, var);
+ return snd_pcm_hw_refine(pcm, params);
+}
+
+void _snd_pcm_hw_params_any(snd_pcm_hw_params_t *params)
+{
+ unsigned int k;
+ memset(params, 0, sizeof(*params));
+ for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++)
+ _snd_pcm_hw_param_any(params, k);
+ for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++)
+ _snd_pcm_hw_param_any(params, k);
+ params->info = ~0U;
+}
+
+/**
+ * snd_pcm_hw_params_any
+ *
+ * Fill PARAMS with full configuration space boundaries
+ */
+int snd_pcm_hw_params_any(snd_pcm_t *pcm, snd_pcm_hw_params_t *params)
+{
+ _snd_pcm_hw_params_any(params);
+ return snd_pcm_hw_refine(pcm, params);
+}
+
+/**
+ * snd_pcm_hw_param_value
+ *
+ * Return the value for field PAR if it's fixed in configuration space
+ * defined by PARAMS. Return -EINVAL otherwise
+ */
+int snd_pcm_hw_param_value(const snd_pcm_hw_params_t *params,
+ snd_pcm_hw_param_t var, int *dir)
+{
+ if (hw_is_mask(var)) {
+ const snd_mask_t *mask = hw_param_mask_c(params, var);
+ if (!snd_mask_single(mask))
+ return -EINVAL;
+ if (dir)
+ *dir = 0;
+ return snd_mask_value(mask);
+ }
+ if (hw_is_interval(var)) {
+ const snd_interval_t *i = hw_param_interval_c(params, var);
+ if (!snd_interval_single(i))
+ return -EINVAL;
+ if (dir)
+ *dir = i->openmin;
+ return snd_interval_value(i);
+ }
+ assert(0);
+ return -EINVAL;
+}
+
+/**
+ * snd_pcm_hw_param_value_min
+ *
+ * Return the minimum value for field PAR.
+ */
+unsigned int snd_pcm_hw_param_value_min(const snd_pcm_hw_params_t *params,
+ snd_pcm_hw_param_t var, int *dir)
+{
+ if (hw_is_mask(var)) {
+ if (dir)
+ *dir = 0;
+ return snd_mask_min(hw_param_mask_c(params, var));
+ }
+ if (hw_is_interval(var)) {
+ const snd_interval_t *i = hw_param_interval_c(params, var);
+ if (dir)
+ *dir = i->openmin;
+ return snd_interval_min(i);
+ }
+ assert(0);
+ return -EINVAL;
+}
+
+/**
+ * snd_pcm_hw_param_value_max
+ *
+ * Return the maximum value for field PAR.
+ */
+unsigned int snd_pcm_hw_param_value_max(const snd_pcm_hw_params_t *params,
+ snd_pcm_hw_param_t var, int *dir)
+{
+ if (hw_is_mask(var)) {
+ if (dir)
+ *dir = 0;
+ return snd_mask_max(hw_param_mask_c(params, var));
+ }
+ if (hw_is_interval(var)) {
+ const snd_interval_t *i = hw_param_interval_c(params, var);
+ if (dir)
+ *dir = - (int) i->openmax;
+ return snd_interval_max(i);
+ }
+ assert(0);
+ return -EINVAL;
+}
+
+void _snd_pcm_hw_param_setempty(snd_pcm_hw_params_t *params,
+ snd_pcm_hw_param_t var)
+{
+ if (hw_is_mask(var)) {
+ snd_mask_none(hw_param_mask(params, var));
+ params->cmask |= 1 << var;
+ params->rmask |= 1 << var;
+ } else if (hw_is_interval(var)) {
+ snd_interval_none(hw_param_interval(params, var));
+ params->cmask |= 1 << var;
+ params->rmask |= 1 << var;
+ } else {
+ snd_BUG();
+ }
+}
+
+int _snd_pcm_hw_param_setinteger(snd_pcm_hw_params_t *params,
+ snd_pcm_hw_param_t var)
+{
+ int changed;
+ assert(hw_is_interval(var));
+ changed = snd_interval_setinteger(hw_param_interval(params, var));
+ if (changed) {
+ params->cmask |= 1 << var;
+ params->rmask |= 1 << var;
+ }
+ return changed;
+}
+
+/**
+ * snd_pcm_hw_param_setinteger
+ *
+ * Inside configuration space defined by PARAMS remove from PAR all
+ * non integer values. Reduce configuration space accordingly.
+ * Return -EINVAL if the configuration space is empty
+ */
+int snd_pcm_hw_param_setinteger(snd_pcm_t *pcm,
+ snd_pcm_hw_params_t *params,
+ snd_pcm_hw_param_t var)
+{
+ int changed = _snd_pcm_hw_param_setinteger(params, var);
+ if (changed < 0)
+ return changed;
+ if (params->rmask) {
+ int err = snd_pcm_hw_refine(pcm, params);
+ if (err < 0)
+ return err;
+ }
+ return 0;
+}
+
+int _snd_pcm_hw_param_first(snd_pcm_hw_params_t *params,
+ snd_pcm_hw_param_t var)
+{
+ int changed;
+ if (hw_is_mask(var))
+ changed = snd_mask_refine_first(hw_param_mask(params, var));
+ else if (hw_is_interval(var))
+ changed = snd_interval_refine_first(hw_param_interval(params, var));
+ else {
+ assert(0);
+ return -EINVAL;
+ }
+ if (changed) {
+ params->cmask |= 1 << var;
+ params->rmask |= 1 << var;
+ }
+ return changed;
+}
+
+
+/**
+ * snd_pcm_hw_param_first
+ *
+ * Inside configuration space defined by PARAMS remove from PAR all
+ * values > minimum. Reduce configuration space accordingly.
+ * Return the minimum.
+ */
+int snd_pcm_hw_param_first(snd_pcm_t *pcm,
+ snd_pcm_hw_params_t *params,
+ snd_pcm_hw_param_t var, int *dir)
+{
+ int changed = _snd_pcm_hw_param_first(params, var);
+ if (changed < 0)
+ return changed;
+ if (params->rmask) {
+ int err = snd_pcm_hw_refine(pcm, params);
+ assert(err >= 0);
+ }
+ return snd_pcm_hw_param_value(params, var, dir);
+}
+
+int _snd_pcm_hw_param_last(snd_pcm_hw_params_t *params,
+ snd_pcm_hw_param_t var)
+{
+ int changed;
+ if (hw_is_mask(var))
+ changed = snd_mask_refine_last(hw_param_mask(params, var));
+ else if (hw_is_interval(var))
+ changed = snd_interval_refine_last(hw_param_interval(params, var));
+ else {
+ assert(0);
+ return -EINVAL;
+ }
+ if (changed) {
+ params->cmask |= 1 << var;
+ params->rmask |= 1 << var;
+ }
+ return changed;
+}
+
+
+/**
+ * snd_pcm_hw_param_last
+ *
+ * Inside configuration space defined by PARAMS remove from PAR all
+ * values < maximum. Reduce configuration space accordingly.
+ * Return the maximum.
+ */
+int snd_pcm_hw_param_last(snd_pcm_t *pcm,
+ snd_pcm_hw_params_t *params,
+ snd_pcm_hw_param_t var, int *dir)
+{
+ int changed = _snd_pcm_hw_param_last(params, var);
+ if (changed < 0)
+ return changed;
+ if (params->rmask) {
+ int err = snd_pcm_hw_refine(pcm, params);
+ assert(err >= 0);
+ }
+ return snd_pcm_hw_param_value(params, var, dir);
+}
+
+int _snd_pcm_hw_param_min(snd_pcm_hw_params_t *params,
+ snd_pcm_hw_param_t var, unsigned int val, int dir)
+{
+ int changed;
+ int open = 0;
+ if (dir) {
+ if (dir > 0) {
+ open = 1;
+ } else if (dir < 0) {
+ if (val > 0) {
+ open = 1;
+ val--;
+ }
+ }
+ }
+ if (hw_is_mask(var))
+ changed = snd_mask_refine_min(hw_param_mask(params, var), val + !!open);
+ else if (hw_is_interval(var))
+ changed = snd_interval_refine_min(hw_param_interval(params, var), val, open);
+ else {
+ assert(0);
+ return -EINVAL;
+ }
+ if (changed) {
+ params->cmask |= 1 << var;
+ params->rmask |= 1 << var;
+ }
+ return changed;
+}
+
+/**
+ * snd_pcm_hw_param_min
+ *
+ * Inside configuration space defined by PARAMS remove from PAR all
+ * values < VAL. Reduce configuration space accordingly.
+ * Return new minimum or -EINVAL if the configuration space is empty
+ */
+int snd_pcm_hw_param_min(snd_pcm_t *pcm, snd_pcm_hw_params_t *params,
+ snd_pcm_hw_param_t var, unsigned int val, int *dir)
+{
+ int changed = _snd_pcm_hw_param_min(params, var, val, dir ? *dir : 0);
+ if (changed < 0)
+ return changed;
+ if (params->rmask) {
+ int err = snd_pcm_hw_refine(pcm, params);
+ if (err < 0)
+ return err;
+ }
+ return snd_pcm_hw_param_value_min(params, var, dir);
+}
+
+int _snd_pcm_hw_param_max(snd_pcm_hw_params_t *params,
+ snd_pcm_hw_param_t var, unsigned int val, int dir)
+{
+ int changed;
+ int open = 0;
+ if (dir) {
+ if (dir < 0) {
+ open = 1;
+ } else if (dir > 0) {
+ open = 1;
+ val++;
+ }
+ }
+ if (hw_is_mask(var)) {
+ if (val == 0 && open) {
+ snd_mask_none(hw_param_mask(params, var));
+ changed = -EINVAL;
+ } else
+ changed = snd_mask_refine_max(hw_param_mask(params, var), val - !!open);
+ } else if (hw_is_interval(var))
+ changed = snd_interval_refine_max(hw_param_interval(params, var), val, open);
+ else {
+ assert(0);
+ return -EINVAL;
+ }
+ if (changed) {
+ params->cmask |= 1 << var;
+ params->rmask |= 1 << var;
+ }
+ return changed;
+}
+
+/**
+ * snd_pcm_hw_param_max
+ *
+ * Inside configuration space defined by PARAMS remove from PAR all
+ * values >= VAL + 1. Reduce configuration space accordingly.
+ * Return new maximum or -EINVAL if the configuration space is empty
+ */
+int snd_pcm_hw_param_max(snd_pcm_t *pcm, snd_pcm_hw_params_t *params,
+ snd_pcm_hw_param_t var, unsigned int val, int *dir)
+{
+ int changed = _snd_pcm_hw_param_max(params, var, val, dir ? *dir : 0);
+ if (changed < 0)
+ return changed;
+ if (params->rmask) {
+ int err = snd_pcm_hw_refine(pcm, params);
+ if (err < 0)
+ return err;
+ }
+ return snd_pcm_hw_param_value_max(params, var, dir);
+}
+
+int _snd_pcm_hw_param_set(snd_pcm_hw_params_t *params,
+ snd_pcm_hw_param_t var, unsigned int val, int dir)
+{
+ int changed;
+ if (hw_is_mask(var)) {
+ snd_mask_t *m = hw_param_mask(params, var);
+ if (val == 0 && dir < 0) {
+ changed = -EINVAL;
+ snd_mask_none(m);
+ } else {
+ if (dir > 0)
+ val++;
+ else if (dir < 0)
+ val--;
+ changed = snd_mask_refine_set(hw_param_mask(params, var), val);
+ }
+ } else if (hw_is_interval(var)) {
+ snd_interval_t *i = hw_param_interval(params, var);
+ if (val == 0 && dir < 0) {
+ changed = -EINVAL;
+ snd_interval_none(i);
+ } else if (dir == 0)
+ changed = snd_interval_refine_set(i, val);
+ else {
+ snd_interval_t t;
+ t.openmin = 1;
+ t.openmax = 1;
+ t.empty = 0;
+ t.integer = 0;
+ if (dir < 0) {
+ t.min = val - 1;
+ t.max = val;
+ } else {
+ t.min = val;
+ t.max = val+1;
+ }
+ changed = snd_interval_refine(i, &t);
+ }
+ } else {
+ assert(0);
+ return -EINVAL;
+ }
+ if (changed) {
+ params->cmask |= 1 << var;
+ params->rmask |= 1 << var;
+ }
+ return changed;
+}
+
+/**
+ * snd_pcm_hw_param_set
+ *
+ * Inside configuration space defined by PARAMS remove from PAR all
+ * values != VAL. Reduce configuration space accordingly.
+ * Return VAL or -EINVAL if the configuration space is empty
+ */
+int snd_pcm_hw_param_set(snd_pcm_t *pcm, snd_pcm_hw_params_t *params,
+ snd_pcm_hw_param_t var, unsigned int val, int dir)
+{
+ int changed = _snd_pcm_hw_param_set(params, var, val, dir);
+ if (changed < 0)
+ return changed;
+ if (params->rmask) {
+ int err = snd_pcm_hw_refine(pcm, params);
+ if (err < 0)
+ return err;
+ }
+ return snd_pcm_hw_param_value(params, var, NULL);
+}
+
+int _snd_pcm_hw_param_mask(snd_pcm_hw_params_t *params,
+ snd_pcm_hw_param_t var, const snd_mask_t *val)
+{
+ int changed;
+ assert(hw_is_mask(var));
+ changed = snd_mask_refine(hw_param_mask(params, var), val);
+ if (changed) {
+ params->cmask |= 1 << var;
+ params->rmask |= 1 << var;
+ }
+ return changed;
+}
+
+/**
+ * snd_pcm_hw_param_mask
+ *
+ * Inside configuration space defined by PARAMS remove from PAR all values
+ * not contained in MASK. Reduce configuration space accordingly.
+ * This function can be called only for SNDRV_PCM_HW_PARAM_ACCESS,
+ * SNDRV_PCM_HW_PARAM_FORMAT, SNDRV_PCM_HW_PARAM_SUBFORMAT.
+ * Return 0 on success or -EINVAL
+ * if the configuration space is empty
+ */
+int snd_pcm_hw_param_mask(snd_pcm_t *pcm, snd_pcm_hw_params_t *params,
+ snd_pcm_hw_param_t var, const snd_mask_t *val)
+{
+ int changed = _snd_pcm_hw_param_mask(params, var, val);
+ if (changed < 0)
+ return changed;
+ if (params->rmask) {
+ int err = snd_pcm_hw_refine(pcm, params);
+ if (err < 0)
+ return err;
+ }
+ return 0;
+}
+
+static int boundary_sub(int a, int adir,
+ int b, int bdir,
+ int *c, int *cdir)
+{
+ adir = adir < 0 ? -1 : (adir > 0 ? 1 : 0);
+ bdir = bdir < 0 ? -1 : (bdir > 0 ? 1 : 0);
+ *c = a - b;
+ *cdir = adir - bdir;
+ if (*cdir == -2) {
+ assert(*c > INT_MIN);
+ (*c)--;
+ } else if (*cdir == 2) {
+ assert(*c < INT_MAX);
+ (*c)++;
+ }
+ return 0;
+}
+
+static int boundary_lt(unsigned int a, int adir,
+ unsigned int b, int bdir)
+{
+ assert(a > 0 || adir >= 0);
+ assert(b > 0 || bdir >= 0);
+ if (adir < 0) {
+ a--;
+ adir = 1;
+ } else if (adir > 0)
+ adir = 1;
+ if (bdir < 0) {
+ b--;
+ bdir = 1;
+ } else if (bdir > 0)
+ bdir = 1;
+ return a < b || (a == b && adir < bdir);
+}
+
+/* Return 1 if min is nearer to best than max */
+static int boundary_nearer(int min, int mindir,
+ int best, int bestdir,
+ int max, int maxdir)
+{
+ int dmin, dmindir;
+ int dmax, dmaxdir;
+ boundary_sub(best, bestdir, min, mindir, &dmin, &dmindir);
+ boundary_sub(max, maxdir, best, bestdir, &dmax, &dmaxdir);
+ return boundary_lt(dmin, dmindir, dmax, dmaxdir);
+}
+
+/**
+ * snd_pcm_hw_param_near
+ *
+ * Inside configuration space defined by PARAMS set PAR to the available value
+ * nearest to VAL. Reduce configuration space accordingly.
+ * This function cannot be called for SNDRV_PCM_HW_PARAM_ACCESS,
+ * SNDRV_PCM_HW_PARAM_FORMAT, SNDRV_PCM_HW_PARAM_SUBFORMAT.
+ * Return the value found.
+ */
+int snd_pcm_hw_param_near(snd_pcm_t *pcm, snd_pcm_hw_params_t *params,
+ snd_pcm_hw_param_t var, unsigned int best, int *dir)
+{
+ snd_pcm_hw_params_t *save = NULL;
+ int v;
+ unsigned int saved_min;
+ int last = 0;
+ int min, max;
+ int mindir, maxdir;
+ int valdir = dir ? *dir : 0;
+ /* FIXME */
+ if (best > INT_MAX)
+ best = INT_MAX;
+ min = max = best;
+ mindir = maxdir = valdir;
+ if (maxdir > 0)
+ maxdir = 0;
+ else if (maxdir == 0)
+ maxdir = -1;
+ else {
+ maxdir = 1;
+ max--;
+ }
+ save = kmalloc(sizeof(*save), GFP_KERNEL);
+ if (save == NULL)
+ return -ENOMEM;
+ *save = *params;
+ saved_min = min;
+ min = snd_pcm_hw_param_min(pcm, params, var, min, &mindir);
+ if (min >= 0) {
+ snd_pcm_hw_params_t *params1;
+ if (max < 0)
+ goto _end;
+ if ((unsigned int)min == saved_min && mindir == valdir)
+ goto _end;
+ params1 = kmalloc(sizeof(*params1), GFP_KERNEL);
+ if (params1 == NULL) {
+ kfree(save);
+ return -ENOMEM;
+ }
+ *params1 = *save;
+ max = snd_pcm_hw_param_max(pcm, params1, var, max, &maxdir);
+ if (max < 0) {
+ kfree(params1);
+ goto _end;
+ }
+ if (boundary_nearer(max, maxdir, best, valdir, min, mindir)) {
+ *params = *params1;
+ last = 1;
+ }
+ kfree(params1);
+ } else {
+ *params = *save;
+ max = snd_pcm_hw_param_max(pcm, params, var, max, &maxdir);
+ assert(max >= 0);
+ last = 1;
+ }
+ _end:
+ kfree(save);
+ if (last)
+ v = snd_pcm_hw_param_last(pcm, params, var, dir);
+ else
+ v = snd_pcm_hw_param_first(pcm, params, var, dir);
+ assert(v >= 0);
+ return v;
+}
+
+/**
+ * snd_pcm_hw_param_choose
+ *
+ * Choose one configuration from configuration space defined by PARAMS
+ * The configuration chosen is that obtained fixing in this order:
+ * first access, first format, first subformat, min channels,
+ * min rate, min period time, max buffer size, min tick time
+ */
+int snd_pcm_hw_params_choose(snd_pcm_t *pcm, snd_pcm_hw_params_t *params)
+{
+ int err;
+
+ err = snd_pcm_hw_param_first(pcm, params, SNDRV_PCM_HW_PARAM_ACCESS, NULL);
+ assert(err >= 0);
+
+ err = snd_pcm_hw_param_first(pcm, params, SNDRV_PCM_HW_PARAM_FORMAT, NULL);
+ assert(err >= 0);
+
+ err = snd_pcm_hw_param_first(pcm, params, SNDRV_PCM_HW_PARAM_SUBFORMAT, NULL);
+ assert(err >= 0);
+
+ err = snd_pcm_hw_param_first(pcm, params, SNDRV_PCM_HW_PARAM_CHANNELS, NULL);
+ assert(err >= 0);
+
+ err = snd_pcm_hw_param_first(pcm, params, SNDRV_PCM_HW_PARAM_RATE, NULL);
+ assert(err >= 0);
+
+ err = snd_pcm_hw_param_first(pcm, params, SNDRV_PCM_HW_PARAM_PERIOD_TIME, NULL);
+ assert(err >= 0);
+
+ err = snd_pcm_hw_param_last(pcm, params, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, NULL);
+ assert(err >= 0);
+
+ err = snd_pcm_hw_param_first(pcm, params, SNDRV_PCM_HW_PARAM_TICK_TIME, NULL);
+ assert(err >= 0);
+
+ return 0;
+}
+
+#undef snd_pcm_t
+#undef assert
+
+static int snd_pcm_lib_ioctl_reset(snd_pcm_substream_t *substream,
+ void *arg)
+{
+ snd_pcm_runtime_t *runtime = substream->runtime;
+ unsigned long flags;
+ snd_pcm_stream_lock_irqsave(substream, flags);
+ if (snd_pcm_running(substream) &&
+ snd_pcm_update_hw_ptr(substream) >= 0)
+ runtime->status->hw_ptr %= runtime->buffer_size;
+ else
+ runtime->status->hw_ptr = 0;
+ snd_pcm_stream_unlock_irqrestore(substream, flags);
+ return 0;
+}
+
+static int snd_pcm_lib_ioctl_channel_info(snd_pcm_substream_t *substream,
+ void *arg)
+{
+ snd_pcm_channel_info_t *info = arg;
+ snd_pcm_runtime_t *runtime = substream->runtime;
+ int width;
+ if (!(runtime->info & SNDRV_PCM_INFO_MMAP)) {
+ info->offset = -1;
+ return 0;
+ }
+ width = snd_pcm_format_physical_width(runtime->format);
+ if (width < 0)
+ return width;
+ info->offset = 0;
+ switch (runtime->access) {
+ case SNDRV_PCM_ACCESS_MMAP_INTERLEAVED:
+ case SNDRV_PCM_ACCESS_RW_INTERLEAVED:
+ info->first = info->channel * width;
+ info->step = runtime->channels * width;
+ break;
+ case SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED:
+ case SNDRV_PCM_ACCESS_RW_NONINTERLEAVED:
+ {
+ size_t size = runtime->dma_bytes / runtime->channels;
+ info->first = info->channel * size * 8;
+ info->step = width;
+ break;
+ }
+ default:
+ snd_BUG();
+ break;
+ }
+ return 0;
+}
+
+/**
+ * snd_pcm_lib_ioctl - a generic PCM ioctl callback
+ * @substream: the pcm substream instance
+ * @cmd: ioctl command
+ * @arg: ioctl argument
+ *
+ * Processes the generic ioctl commands for PCM.
+ * Can be passed as the ioctl callback for PCM ops.
+ *
+ * Returns zero if successful, or a negative error code on failure.
+ */
+int snd_pcm_lib_ioctl(snd_pcm_substream_t *substream,
+ unsigned int cmd, void *arg)
+{
+ switch (cmd) {
+ case SNDRV_PCM_IOCTL1_INFO:
+ return 0;
+ case SNDRV_PCM_IOCTL1_RESET:
+ return snd_pcm_lib_ioctl_reset(substream, arg);
+ case SNDRV_PCM_IOCTL1_CHANNEL_INFO:
+ return snd_pcm_lib_ioctl_channel_info(substream, arg);
+ }
+ return -ENXIO;
+}
+
+/*
+ * Conditions
+ */
+
+static void snd_pcm_system_tick_set(snd_pcm_substream_t *substream,
+ unsigned long ticks)
+{
+ snd_pcm_runtime_t *runtime = substream->runtime;
+ if (ticks == 0)
+ del_timer(&runtime->tick_timer);
+ else {
+ ticks += (1000000 / HZ) - 1;
+ ticks /= (1000000 / HZ);
+ mod_timer(&runtime->tick_timer, jiffies + ticks);
+ }
+}
+
+/* Temporary alias */
+void snd_pcm_tick_set(snd_pcm_substream_t *substream, unsigned long ticks)
+{
+ snd_pcm_system_tick_set(substream, ticks);
+}
+
+void snd_pcm_tick_prepare(snd_pcm_substream_t *substream)
+{
+ snd_pcm_runtime_t *runtime = substream->runtime;
+ snd_pcm_uframes_t frames = ULONG_MAX;
+ snd_pcm_uframes_t avail, dist;
+ unsigned int ticks;
+ u_int64_t n;
+ u_int32_t r;
+ if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
+ if (runtime->silence_size >= runtime->boundary) {
+ frames = 1;
+ } else if (runtime->silence_size > 0 &&
+ runtime->silence_filled < runtime->buffer_size) {
+ snd_pcm_sframes_t noise_dist;
+ noise_dist = snd_pcm_playback_hw_avail(runtime) + runtime->silence_filled;
+ snd_assert(noise_dist <= (snd_pcm_sframes_t)runtime->silence_threshold, );
+ frames = noise_dist - runtime->silence_threshold;
+ }
+ avail = snd_pcm_playback_avail(runtime);
+ } else {
+ avail = snd_pcm_capture_avail(runtime);
+ }
+ if (avail < runtime->control->avail_min) {
+ snd_pcm_sframes_t n = runtime->control->avail_min - avail;
+ if (n > 0 && frames > (snd_pcm_uframes_t)n)
+ frames = n;
+ }
+ if (avail < runtime->buffer_size) {
+ snd_pcm_sframes_t n = runtime->buffer_size - avail;
+ if (n > 0 && frames > (snd_pcm_uframes_t)n)
+ frames = n;
+ }
+ if (frames == ULONG_MAX) {
+ snd_pcm_tick_set(substream, 0);
+ return;
+ }
+ dist = runtime->status->hw_ptr - runtime->hw_ptr_base;
+ /* Distance to next interrupt */
+ dist = runtime->period_size - dist % runtime->period_size;
+ if (dist <= frames) {
+ snd_pcm_tick_set(substream, 0);
+ return;
+ }
+ /* the base time is us */
+ n = frames;
+ n *= 1000000;
+ div64_32(&n, runtime->tick_time * runtime->rate, &r);
+ ticks = n + (r > 0 ? 1 : 0);
+ if (ticks < runtime->sleep_min)
+ ticks = runtime->sleep_min;
+ snd_pcm_tick_set(substream, (unsigned long) ticks);
+}
+
+void snd_pcm_tick_elapsed(snd_pcm_substream_t *substream)
+{
+ snd_pcm_runtime_t *runtime;
+ unsigned long flags;
+
+ snd_assert(substream != NULL, return);
+ runtime = substream->runtime;
+ snd_assert(runtime != NULL, return);
+
+ snd_pcm_stream_lock_irqsave(substream, flags);
+ if (!snd_pcm_running(substream) ||
+ snd_pcm_update_hw_ptr(substream) < 0)
+ goto _end;
+ if (runtime->sleep_min)
+ snd_pcm_tick_prepare(substream);
+ _end:
+ snd_pcm_stream_unlock_irqrestore(substream, flags);
+}
+
+/**
+ * snd_pcm_period_elapsed - update the pcm status for the next period
+ * @substream: the pcm substream instance
+ *
+ * This function is called from the interrupt handler when the
+ * PCM has processed the period size. It will update the current
+ * pointer, set up the tick, wake up sleepers, etc.
+ *
+ * Even if more than one periods have elapsed since the last call, you
+ * have to call this only once.
+ */
+void snd_pcm_period_elapsed(snd_pcm_substream_t *substream)
+{
+ snd_pcm_runtime_t *runtime;
+ unsigned long flags;
+
+ snd_assert(substream != NULL, return);
+ runtime = substream->runtime;
+ snd_assert(runtime != NULL, return);
+
+ if (runtime->transfer_ack_begin)
+ runtime->transfer_ack_begin(substream);
+
+ snd_pcm_stream_lock_irqsave(substream, flags);
+ if (!snd_pcm_running(substream) ||
+ snd_pcm_update_hw_ptr_interrupt(substream) < 0)
+ goto _end;
+
+ if (substream->timer_running)
+ snd_timer_interrupt(substream->timer, 1);
+ if (runtime->sleep_min)
+ snd_pcm_tick_prepare(substream);
+ _end:
+ snd_pcm_stream_unlock_irqrestore(substream, flags);
+ if (runtime->transfer_ack_end)
+ runtime->transfer_ack_end(substream);
+ kill_fasync(&runtime->fasync, SIGIO, POLL_IN);
+}
+
+static int snd_pcm_lib_write_transfer(snd_pcm_substream_t *substream,
+ unsigned int hwoff,
+ unsigned long data, unsigned int off,
+ snd_pcm_uframes_t frames)
+{
+ snd_pcm_runtime_t *runtime = substream->runtime;
+ int err;
+ char __user *buf = (char __user *) data + frames_to_bytes(runtime, off);
+ if (substream->ops->copy) {
+ if ((err = substream->ops->copy(substream, -1, hwoff, buf, frames)) < 0)
+ return err;
+ } else {
+ char *hwbuf = runtime->dma_area + frames_to_bytes(runtime, hwoff);
+ snd_assert(runtime->dma_area, return -EFAULT);
+ if (copy_from_user(hwbuf, buf, frames_to_bytes(runtime, frames)))
+ return -EFAULT;
+ }
+ return 0;
+}
+
+typedef int (*transfer_f)(snd_pcm_substream_t *substream, unsigned int hwoff,
+ unsigned long data, unsigned int off,
+ snd_pcm_uframes_t size);
+
+static snd_pcm_sframes_t snd_pcm_lib_write1(snd_pcm_substream_t *substream,
+ unsigned long data,
+ snd_pcm_uframes_t size,
+ int nonblock,
+ transfer_f transfer)
+{
+ snd_pcm_runtime_t *runtime = substream->runtime;
+ snd_pcm_uframes_t xfer = 0;
+ snd_pcm_uframes_t offset = 0;
+ int err = 0;
+
+ if (size == 0)
+ return 0;
+ if (size > runtime->xfer_align)
+ size -= size % runtime->xfer_align;
+
+ snd_pcm_stream_lock_irq(substream);
+ switch (runtime->status->state) {
+ case SNDRV_PCM_STATE_PREPARED:
+ case SNDRV_PCM_STATE_RUNNING:
+ case SNDRV_PCM_STATE_PAUSED:
+ break;
+ case SNDRV_PCM_STATE_XRUN:
+ err = -EPIPE;
+ goto _end_unlock;
+ case SNDRV_PCM_STATE_SUSPENDED:
+ err = -ESTRPIPE;
+ goto _end_unlock;
+ default:
+ err = -EBADFD;
+ goto _end_unlock;
+ }
+
+ while (size > 0) {
+ snd_pcm_uframes_t frames, appl_ptr, appl_ofs;
+ snd_pcm_uframes_t avail;
+ snd_pcm_uframes_t cont;
+ if (runtime->sleep_min == 0 && runtime->status->state == SNDRV_PCM_STATE_RUNNING)
+ snd_pcm_update_hw_ptr(substream);
+ avail = snd_pcm_playback_avail(runtime);
+ if (((avail < runtime->control->avail_min && size > avail) ||
+ (size >= runtime->xfer_align && avail < runtime->xfer_align))) {
+ wait_queue_t wait;
+ enum { READY, SIGNALED, ERROR, SUSPENDED, EXPIRED } state;
+ long tout;
+
+ if (nonblock) {
+ err = -EAGAIN;
+ goto _end_unlock;
+ }
+
+ init_waitqueue_entry(&wait, current);
+ add_wait_queue(&runtime->sleep, &wait);
+ while (1) {
+ if (signal_pending(current)) {
+ state = SIGNALED;
+ break;
+ }
+ set_current_state(TASK_INTERRUPTIBLE);
+ snd_pcm_stream_unlock_irq(substream);
+ tout = schedule_timeout(10 * HZ);
+ snd_pcm_stream_lock_irq(substream);
+ if (tout == 0) {
+ if (runtime->status->state != SNDRV_PCM_STATE_PREPARED &&
+ runtime->status->state != SNDRV_PCM_STATE_PAUSED) {
+ state = runtime->status->state == SNDRV_PCM_STATE_SUSPENDED ? SUSPENDED : EXPIRED;
+ break;
+ }
+ }
+ switch (runtime->status->state) {
+ case SNDRV_PCM_STATE_XRUN:
+ case SNDRV_PCM_STATE_DRAINING:
+ state = ERROR;
+ goto _end_loop;
+ case SNDRV_PCM_STATE_SUSPENDED:
+ state = SUSPENDED;
+ goto _end_loop;
+ default:
+ break;
+ }
+ avail = snd_pcm_playback_avail(runtime);
+ if (avail >= runtime->control->avail_min) {
+ state = READY;
+ break;
+ }
+ }
+ _end_loop:
+ remove_wait_queue(&runtime->sleep, &wait);
+
+ switch (state) {
+ case ERROR:
+ err = -EPIPE;
+ goto _end_unlock;
+ case SUSPENDED:
+ err = -ESTRPIPE;
+ goto _end_unlock;
+ case SIGNALED:
+ err = -ERESTARTSYS;
+ goto _end_unlock;
+ case EXPIRED:
+ snd_printd("playback write error (DMA or IRQ trouble?)\n");
+ err = -EIO;
+ goto _end_unlock;
+ default:
+ break;
+ }
+ }
+ if (avail > runtime->xfer_align)
+ avail -= avail % runtime->xfer_align;
+ frames = size > avail ? avail : size;
+ cont = runtime->buffer_size - runtime->control->appl_ptr % runtime->buffer_size;
+ if (frames > cont)
+ frames = cont;
+ snd_assert(frames != 0, snd_pcm_stream_unlock_irq(substream); return -EINVAL);
+ appl_ptr = runtime->control->appl_ptr;
+ appl_ofs = appl_ptr % runtime->buffer_size;
+ snd_pcm_stream_unlock_irq(substream);
+ if ((err = transfer(substream, appl_ofs, data, offset, frames)) < 0)
+ goto _end;
+ snd_pcm_stream_lock_irq(substream);
+ switch (runtime->status->state) {
+ case SNDRV_PCM_STATE_XRUN:
+ err = -EPIPE;
+ goto _end_unlock;
+ case SNDRV_PCM_STATE_SUSPENDED:
+ err = -ESTRPIPE;
+ goto _end_unlock;
+ default:
+ break;
+ }
+ appl_ptr += frames;
+ if (appl_ptr >= runtime->boundary)
+ appl_ptr -= runtime->boundary;
+ runtime->control->appl_ptr = appl_ptr;
+ if (substream->ops->ack)
+ substream->ops->ack(substream);
+
+ offset += frames;
+ size -= frames;
+ xfer += frames;
+ if (runtime->status->state == SNDRV_PCM_STATE_PREPARED &&
+ snd_pcm_playback_hw_avail(runtime) >= (snd_pcm_sframes_t)runtime->start_threshold) {
+ err = snd_pcm_start(substream);
+ if (err < 0)
+ goto _end_unlock;
+ }
+ if (runtime->sleep_min &&
+ runtime->status->state == SNDRV_PCM_STATE_RUNNING)
+ snd_pcm_tick_prepare(substream);
+ }
+ _end_unlock:
+ snd_pcm_stream_unlock_irq(substream);
+ _end:
+ return xfer > 0 ? (snd_pcm_sframes_t)xfer : err;
+}
+
+snd_pcm_sframes_t snd_pcm_lib_write(snd_pcm_substream_t *substream, const void __user *buf, snd_pcm_uframes_t size)
+{
+ snd_pcm_runtime_t *runtime;
+ int nonblock;
+
+ snd_assert(substream != NULL, return -ENXIO);
+ runtime = substream->runtime;
+ snd_assert(runtime != NULL, return -ENXIO);
+ snd_assert(substream->ops->copy != NULL || runtime->dma_area != NULL, return -EINVAL);
+ if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
+ return -EBADFD;
+
+ snd_assert(substream->ffile != NULL, return -ENXIO);
+ nonblock = !!(substream->ffile->f_flags & O_NONBLOCK);
+#if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
+ if (substream->oss.oss) {
+ snd_pcm_oss_setup_t *setup = substream->oss.setup;
+ if (setup != NULL) {
+ if (setup->nonblock)
+ nonblock = 1;
+ else if (setup->block)
+ nonblock = 0;
+ }
+ }
+#endif
+
+ if (runtime->access != SNDRV_PCM_ACCESS_RW_INTERLEAVED &&
+ runtime->channels > 1)
+ return -EINVAL;
+ return snd_pcm_lib_write1(substream, (unsigned long)buf, size, nonblock,
+ snd_pcm_lib_write_transfer);
+}
+
+static int snd_pcm_lib_writev_transfer(snd_pcm_substream_t *substream,
+ unsigned int hwoff,
+ unsigned long data, unsigned int off,
+ snd_pcm_uframes_t frames)
+{
+ snd_pcm_runtime_t *runtime = substream->runtime;
+ int err;
+ void __user **bufs = (void __user **)data;
+ int channels = runtime->channels;
+ int c;
+ if (substream->ops->copy) {
+ snd_assert(substream->ops->silence != NULL, return -EINVAL);
+ for (c = 0; c < channels; ++c, ++bufs) {
+ if (*bufs == NULL) {
+ if ((err = substream->ops->silence(substream, c, hwoff, frames)) < 0)
+ return err;
+ } else {
+ char __user *buf = *bufs + samples_to_bytes(runtime, off);
+ if ((err = substream->ops->copy(substream, c, hwoff, buf, frames)) < 0)
+ return err;
+ }
+ }
+ } else {
+ /* default transfer behaviour */
+ size_t dma_csize = runtime->dma_bytes / channels;
+ snd_assert(runtime->dma_area, return -EFAULT);
+ for (c = 0; c < channels; ++c, ++bufs) {
+ char *hwbuf = runtime->dma_area + (c * dma_csize) + samples_to_bytes(runtime, hwoff);
+ if (*bufs == NULL) {
+ snd_pcm_format_set_silence(runtime->format, hwbuf, frames);
+ } else {
+ char __user *buf = *bufs + samples_to_bytes(runtime, off);
+ if (copy_from_user(hwbuf, buf, samples_to_bytes(runtime, frames)))
+ return -EFAULT;
+ }
+ }
+ }
+ return 0;
+}
+
+snd_pcm_sframes_t snd_pcm_lib_writev(snd_pcm_substream_t *substream,
+ void __user **bufs,
+ snd_pcm_uframes_t frames)
+{
+ snd_pcm_runtime_t *runtime;
+ int nonblock;
+
+ snd_assert(substream != NULL, return -ENXIO);
+ runtime = substream->runtime;
+ snd_assert(runtime != NULL, return -ENXIO);
+ snd_assert(substream->ops->copy != NULL || runtime->dma_area != NULL, return -EINVAL);
+ if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
+ return -EBADFD;
+
+ snd_assert(substream->ffile != NULL, return -ENXIO);
+ nonblock = !!(substream->ffile->f_flags & O_NONBLOCK);
+#if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
+ if (substream->oss.oss) {
+ snd_pcm_oss_setup_t *setup = substream->oss.setup;
+ if (setup != NULL) {
+ if (setup->nonblock)
+ nonblock = 1;
+ else if (setup->block)
+ nonblock = 0;
+ }
+ }
+#endif
+
+ if (runtime->access != SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
+ return -EINVAL;
+ return snd_pcm_lib_write1(substream, (unsigned long)bufs, frames,
+ nonblock, snd_pcm_lib_writev_transfer);
+}
+
+static int snd_pcm_lib_read_transfer(snd_pcm_substream_t *substream,
+ unsigned int hwoff,
+ unsigned long data, unsigned int off,
+ snd_pcm_uframes_t frames)
+{
+ snd_pcm_runtime_t *runtime = substream->runtime;
+ int err;
+ char __user *buf = (char __user *) data + frames_to_bytes(runtime, off);
+ if (substream->ops->copy) {
+ if ((err = substream->ops->copy(substream, -1, hwoff, buf, frames)) < 0)
+ return err;
+ } else {
+ char *hwbuf = runtime->dma_area + frames_to_bytes(runtime, hwoff);
+ snd_assert(runtime->dma_area, return -EFAULT);
+ if (copy_to_user(buf, hwbuf, frames_to_bytes(runtime, frames)))
+ return -EFAULT;
+ }
+ return 0;
+}
+
+static snd_pcm_sframes_t snd_pcm_lib_read1(snd_pcm_substream_t *substream,
+ unsigned long data,
+ snd_pcm_uframes_t size,
+ int nonblock,
+ transfer_f transfer)
+{
+ snd_pcm_runtime_t *runtime = substream->runtime;
+ snd_pcm_uframes_t xfer = 0;
+ snd_pcm_uframes_t offset = 0;
+ int err = 0;
+
+ if (size == 0)
+ return 0;
+ if (size > runtime->xfer_align)
+ size -= size % runtime->xfer_align;
+
+ snd_pcm_stream_lock_irq(substream);
+ switch (runtime->status->state) {
+ case SNDRV_PCM_STATE_PREPARED:
+ if (size >= runtime->start_threshold) {
+ err = snd_pcm_start(substream);
+ if (err < 0)
+ goto _end_unlock;
+ }
+ break;
+ case SNDRV_PCM_STATE_DRAINING:
+ case SNDRV_PCM_STATE_RUNNING:
+ case SNDRV_PCM_STATE_PAUSED:
+ break;
+ case SNDRV_PCM_STATE_XRUN:
+ err = -EPIPE;
+ goto _end_unlock;
+ case SNDRV_PCM_STATE_SUSPENDED:
+ err = -ESTRPIPE;
+ goto _end_unlock;
+ default:
+ err = -EBADFD;
+ goto _end_unlock;
+ }
+
+ while (size > 0) {
+ snd_pcm_uframes_t frames, appl_ptr, appl_ofs;
+ snd_pcm_uframes_t avail;
+ snd_pcm_uframes_t cont;
+ if (runtime->sleep_min == 0 && runtime->status->state == SNDRV_PCM_STATE_RUNNING)
+ snd_pcm_update_hw_ptr(substream);
+ __draining:
+ avail = snd_pcm_capture_avail(runtime);
+ if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
+ if (avail < runtime->xfer_align) {
+ err = -EPIPE;
+ goto _end_unlock;
+ }
+ } else if ((avail < runtime->control->avail_min && size > avail) ||
+ (size >= runtime->xfer_align && avail < runtime->xfer_align)) {
+ wait_queue_t wait;
+ enum { READY, SIGNALED, ERROR, SUSPENDED, EXPIRED } state;
+ long tout;
+
+ if (nonblock) {
+ err = -EAGAIN;
+ goto _end_unlock;
+ }
+
+ init_waitqueue_entry(&wait, current);
+ add_wait_queue(&runtime->sleep, &wait);
+ while (1) {
+ if (signal_pending(current)) {
+ state = SIGNALED;
+ break;
+ }
+ set_current_state(TASK_INTERRUPTIBLE);
+ snd_pcm_stream_unlock_irq(substream);
+ tout = schedule_timeout(10 * HZ);
+ snd_pcm_stream_lock_irq(substream);
+ if (tout == 0) {
+ if (runtime->status->state != SNDRV_PCM_STATE_PREPARED &&
+ runtime->status->state != SNDRV_PCM_STATE_PAUSED) {
+ state = runtime->status->state == SNDRV_PCM_STATE_SUSPENDED ? SUSPENDED : EXPIRED;
+ break;
+ }
+ }
+ switch (runtime->status->state) {
+ case SNDRV_PCM_STATE_XRUN:
+ state = ERROR;
+ goto _end_loop;
+ case SNDRV_PCM_STATE_SUSPENDED:
+ state = SUSPENDED;
+ goto _end_loop;
+ case SNDRV_PCM_STATE_DRAINING:
+ goto __draining;
+ default:
+ break;
+ }
+ avail = snd_pcm_capture_avail(runtime);
+ if (avail >= runtime->control->avail_min) {
+ state = READY;
+ break;
+ }
+ }
+ _end_loop:
+ remove_wait_queue(&runtime->sleep, &wait);
+
+ switch (state) {
+ case ERROR:
+ err = -EPIPE;
+ goto _end_unlock;
+ case SUSPENDED:
+ err = -ESTRPIPE;
+ goto _end_unlock;
+ case SIGNALED:
+ err = -ERESTARTSYS;
+ goto _end_unlock;
+ case EXPIRED:
+ snd_printd("capture read error (DMA or IRQ trouble?)\n");
+ err = -EIO;
+ goto _end_unlock;
+ default:
+ break;
+ }
+ }
+ if (avail > runtime->xfer_align)
+ avail -= avail % runtime->xfer_align;
+ frames = size > avail ? avail : size;
+ cont = runtime->buffer_size - runtime->control->appl_ptr % runtime->buffer_size;
+ if (frames > cont)
+ frames = cont;
+ snd_assert(frames != 0, snd_pcm_stream_unlock_irq(substream); return -EINVAL);
+ appl_ptr = runtime->control->appl_ptr;
+ appl_ofs = appl_ptr % runtime->buffer_size;
+ snd_pcm_stream_unlock_irq(substream);
+ if ((err = transfer(substream, appl_ofs, data, offset, frames)) < 0)
+ goto _end;
+ snd_pcm_stream_lock_irq(substream);
+ switch (runtime->status->state) {
+ case SNDRV_PCM_STATE_XRUN:
+ err = -EPIPE;
+ goto _end_unlock;
+ case SNDRV_PCM_STATE_SUSPENDED:
+ err = -ESTRPIPE;
+ goto _end_unlock;
+ default:
+ break;
+ }
+ appl_ptr += frames;
+ if (appl_ptr >= runtime->boundary)
+ appl_ptr -= runtime->boundary;
+ runtime->control->appl_ptr = appl_ptr;
+ if (substream->ops->ack)
+ substream->ops->ack(substream);
+
+ offset += frames;
+ size -= frames;
+ xfer += frames;
+ if (runtime->sleep_min &&
+ runtime->status->state == SNDRV_PCM_STATE_RUNNING)
+ snd_pcm_tick_prepare(substream);
+ }
+ _end_unlock:
+ snd_pcm_stream_unlock_irq(substream);
+ _end:
+ return xfer > 0 ? (snd_pcm_sframes_t)xfer : err;
+}
+
+snd_pcm_sframes_t snd_pcm_lib_read(snd_pcm_substream_t *substream, void __user *buf, snd_pcm_uframes_t size)
+{
+ snd_pcm_runtime_t *runtime;
+ int nonblock;
+
+ snd_assert(substream != NULL, return -ENXIO);
+ runtime = substream->runtime;
+ snd_assert(runtime != NULL, return -ENXIO);
+ snd_assert(substream->ops->copy != NULL || runtime->dma_area != NULL, return -EINVAL);
+ if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
+ return -EBADFD;
+
+ snd_assert(substream->ffile != NULL, return -ENXIO);
+ nonblock = !!(substream->ffile->f_flags & O_NONBLOCK);
+#if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
+ if (substream->oss.oss) {
+ snd_pcm_oss_setup_t *setup = substream->oss.setup;
+ if (setup != NULL) {
+ if (setup->nonblock)
+ nonblock = 1;
+ else if (setup->block)
+ nonblock = 0;
+ }
+ }
+#endif
+ if (runtime->access != SNDRV_PCM_ACCESS_RW_INTERLEAVED)
+ return -EINVAL;
+ return snd_pcm_lib_read1(substream, (unsigned long)buf, size, nonblock, snd_pcm_lib_read_transfer);
+}
+
+static int snd_pcm_lib_readv_transfer(snd_pcm_substream_t *substream,
+ unsigned int hwoff,
+ unsigned long data, unsigned int off,
+ snd_pcm_uframes_t frames)
+{
+ snd_pcm_runtime_t *runtime = substream->runtime;
+ int err;
+ void __user **bufs = (void __user **)data;
+ int channels = runtime->channels;
+ int c;
+ if (substream->ops->copy) {
+ for (c = 0; c < channels; ++c, ++bufs) {
+ char __user *buf;
+ if (*bufs == NULL)
+ continue;
+ buf = *bufs + samples_to_bytes(runtime, off);
+ if ((err = substream->ops->copy(substream, c, hwoff, buf, frames)) < 0)
+ return err;
+ }
+ } else {
+ snd_pcm_uframes_t dma_csize = runtime->dma_bytes / channels;
+ snd_assert(runtime->dma_area, return -EFAULT);
+ for (c = 0; c < channels; ++c, ++bufs) {
+ char *hwbuf;
+ char __user *buf;
+ if (*bufs == NULL)
+ continue;
+
+ hwbuf = runtime->dma_area + (c * dma_csize) + samples_to_bytes(runtime, hwoff);
+ buf = *bufs + samples_to_bytes(runtime, off);
+ if (copy_to_user(buf, hwbuf, samples_to_bytes(runtime, frames)))
+ return -EFAULT;
+ }
+ }
+ return 0;
+}
+
+snd_pcm_sframes_t snd_pcm_lib_readv(snd_pcm_substream_t *substream,
+ void __user **bufs,
+ snd_pcm_uframes_t frames)
+{
+ snd_pcm_runtime_t *runtime;
+ int nonblock;
+
+ snd_assert(substream != NULL, return -ENXIO);
+ runtime = substream->runtime;
+ snd_assert(runtime != NULL, return -ENXIO);
+ snd_assert(substream->ops->copy != NULL || runtime->dma_area != NULL, return -EINVAL);
+ if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
+ return -EBADFD;
+
+ snd_assert(substream->ffile != NULL, return -ENXIO);
+ nonblock = !!(substream->ffile->f_flags & O_NONBLOCK);
+#if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
+ if (substream->oss.oss) {
+ snd_pcm_oss_setup_t *setup = substream->oss.setup;
+ if (setup != NULL) {
+ if (setup->nonblock)
+ nonblock = 1;
+ else if (setup->block)
+ nonblock = 0;
+ }
+ }
+#endif
+
+ if (runtime->access != SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
+ return -EINVAL;
+ return snd_pcm_lib_read1(substream, (unsigned long)bufs, frames, nonblock, snd_pcm_lib_readv_transfer);
+}
+
+/*
+ * Exported symbols
+ */
+
+EXPORT_SYMBOL(snd_interval_refine);
+EXPORT_SYMBOL(snd_interval_list);
+EXPORT_SYMBOL(snd_interval_ratnum);
+EXPORT_SYMBOL(snd_interval_muldivk);
+EXPORT_SYMBOL(snd_interval_mulkdiv);
+EXPORT_SYMBOL(snd_interval_div);
+EXPORT_SYMBOL(_snd_pcm_hw_params_any);
+EXPORT_SYMBOL(_snd_pcm_hw_param_min);
+EXPORT_SYMBOL(_snd_pcm_hw_param_set);
+EXPORT_SYMBOL(_snd_pcm_hw_param_setempty);
+EXPORT_SYMBOL(_snd_pcm_hw_param_setinteger);
+EXPORT_SYMBOL(snd_pcm_hw_param_value_min);
+EXPORT_SYMBOL(snd_pcm_hw_param_value_max);
+EXPORT_SYMBOL(snd_pcm_hw_param_mask);
+EXPORT_SYMBOL(snd_pcm_hw_param_first);
+EXPORT_SYMBOL(snd_pcm_hw_param_last);
+EXPORT_SYMBOL(snd_pcm_hw_param_near);
+EXPORT_SYMBOL(snd_pcm_hw_param_set);
+EXPORT_SYMBOL(snd_pcm_hw_refine);
+EXPORT_SYMBOL(snd_pcm_hw_params);
+EXPORT_SYMBOL(snd_pcm_hw_constraints_init);
+EXPORT_SYMBOL(snd_pcm_hw_constraints_complete);
+EXPORT_SYMBOL(snd_pcm_hw_constraint_list);
+EXPORT_SYMBOL(snd_pcm_hw_constraint_step);
+EXPORT_SYMBOL(snd_pcm_hw_constraint_ratnums);
+EXPORT_SYMBOL(snd_pcm_hw_constraint_ratdens);
+EXPORT_SYMBOL(snd_pcm_hw_constraint_msbits);
+EXPORT_SYMBOL(snd_pcm_hw_constraint_minmax);
+EXPORT_SYMBOL(snd_pcm_hw_constraint_integer);
+EXPORT_SYMBOL(snd_pcm_hw_constraint_pow2);
+EXPORT_SYMBOL(snd_pcm_hw_rule_add);
+EXPORT_SYMBOL(snd_pcm_set_ops);
+EXPORT_SYMBOL(snd_pcm_set_sync);
+EXPORT_SYMBOL(snd_pcm_lib_ioctl);
+EXPORT_SYMBOL(snd_pcm_stop);
+EXPORT_SYMBOL(snd_pcm_period_elapsed);
+EXPORT_SYMBOL(snd_pcm_lib_write);
+EXPORT_SYMBOL(snd_pcm_lib_read);
+EXPORT_SYMBOL(snd_pcm_lib_writev);
+EXPORT_SYMBOL(snd_pcm_lib_readv);
+EXPORT_SYMBOL(snd_pcm_lib_buffer_bytes);
+EXPORT_SYMBOL(snd_pcm_lib_period_bytes);
+/* pcm_memory.c */
+EXPORT_SYMBOL(snd_pcm_lib_preallocate_free_for_all);
+EXPORT_SYMBOL(snd_pcm_lib_preallocate_pages);
+EXPORT_SYMBOL(snd_pcm_lib_preallocate_pages_for_all);
+EXPORT_SYMBOL(snd_pcm_sgbuf_ops_page);
+EXPORT_SYMBOL(snd_pcm_lib_malloc_pages);
+EXPORT_SYMBOL(snd_pcm_lib_free_pages);