--- /dev/null
+/*
+ * Digital Audio (PCM) abstract layer
+ * Copyright (c) by Jaroslav Kysela <perex@perex.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 <linux/slab.h>
+#include <linux/time.h>
+#include <linux/math64.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(struct snd_pcm_substream *substream, snd_pcm_uframes_t new_hw_ptr)
+{
+ struct snd_pcm_runtime *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;
+ 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 = new_hw_ptr;
+ } else {
+ runtime->silence_start = ofs;
+ }
+ }
+ frames = runtime->buffer_size - runtime->silence_filled;
+ }
+ if (snd_BUG_ON(frames > runtime->buffer_size))
+ return;
+ if (frames == 0)
+ return;
+ ofs = runtime->silence_start % 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_BUG_ON(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_BUG_ON(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 pcm_debug_name(struct snd_pcm_substream *substream,
+ char *name, size_t len)
+{
+ snprintf(name, len, "pcmC%dD%d%c:%d",
+ substream->pcm->card->number,
+ substream->pcm->device,
+ substream->stream ? 'c' : 'p',
+ substream->number);
+}
+
+#define XRUN_DEBUG_BASIC (1<<0)
+#define XRUN_DEBUG_STACK (1<<1) /* dump also stack */
+#define XRUN_DEBUG_JIFFIESCHECK (1<<2) /* do jiffies check */
+#define XRUN_DEBUG_PERIODUPDATE (1<<3) /* full period update info */
+#define XRUN_DEBUG_HWPTRUPDATE (1<<4) /* full hwptr update info */
+#define XRUN_DEBUG_LOG (1<<5) /* show last 10 positions on err */
+#define XRUN_DEBUG_LOGONCE (1<<6) /* do above only once */
+
+#ifdef CONFIG_SND_PCM_XRUN_DEBUG
+
+#define xrun_debug(substream, mask) \
+ ((substream)->pstr->xrun_debug & (mask))
+#else
+#define xrun_debug(substream, mask) 0
+#endif
+
+#define dump_stack_on_xrun(substream) do { \
+ if (xrun_debug(substream, XRUN_DEBUG_STACK)) \
+ dump_stack(); \
+ } while (0)
+
+static void xrun(struct snd_pcm_substream *substream)
+{
+ struct snd_pcm_runtime *runtime = substream->runtime;
+
+ if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE)
+ snd_pcm_gettime(runtime, (struct timespec *)&runtime->status->tstamp);
+ snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
+ if (xrun_debug(substream, XRUN_DEBUG_BASIC)) {
+ char name[16];
+ pcm_debug_name(substream, name, sizeof(name));
+ snd_printd(KERN_DEBUG "XRUN: %s\n", name);
+ dump_stack_on_xrun(substream);
+ }
+}
+
+#ifdef CONFIG_SND_PCM_XRUN_DEBUG
+#define hw_ptr_error(substream, fmt, args...) \
+ do { \
+ if (xrun_debug(substream, XRUN_DEBUG_BASIC)) { \
+ xrun_log_show(substream); \
+ if (printk_ratelimit()) { \
+ snd_printd("PCM: " fmt, ##args); \
+ } \
+ dump_stack_on_xrun(substream); \
+ } \
+ } while (0)
+
+#define XRUN_LOG_CNT 10
+
+struct hwptr_log_entry {
+ unsigned long jiffies;
+ snd_pcm_uframes_t pos;
+ snd_pcm_uframes_t period_size;
+ snd_pcm_uframes_t buffer_size;
+ snd_pcm_uframes_t old_hw_ptr;
+ snd_pcm_uframes_t hw_ptr_base;
+};
+
+struct snd_pcm_hwptr_log {
+ unsigned int idx;
+ unsigned int hit: 1;
+ struct hwptr_log_entry entries[XRUN_LOG_CNT];
+};
+
+static void xrun_log(struct snd_pcm_substream *substream,
+ snd_pcm_uframes_t pos)
+{
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ struct snd_pcm_hwptr_log *log = runtime->hwptr_log;
+ struct hwptr_log_entry *entry;
+
+ if (log == NULL) {
+ log = kzalloc(sizeof(*log), GFP_ATOMIC);
+ if (log == NULL)
+ return;
+ runtime->hwptr_log = log;
+ } else {
+ if (xrun_debug(substream, XRUN_DEBUG_LOGONCE) && log->hit)
+ return;
+ }
+ entry = &log->entries[log->idx];
+ entry->jiffies = jiffies;
+ entry->pos = pos;
+ entry->period_size = runtime->period_size;
+ entry->buffer_size = runtime->buffer_size;;
+ entry->old_hw_ptr = runtime->status->hw_ptr;
+ entry->hw_ptr_base = runtime->hw_ptr_base;
+ log->idx = (log->idx + 1) % XRUN_LOG_CNT;
+}
+
+static void xrun_log_show(struct snd_pcm_substream *substream)
+{
+ struct snd_pcm_hwptr_log *log = substream->runtime->hwptr_log;
+ struct hwptr_log_entry *entry;
+ char name[16];
+ unsigned int idx;
+ int cnt;
+
+ if (log == NULL)
+ return;
+ if (xrun_debug(substream, XRUN_DEBUG_LOGONCE) && log->hit)
+ return;
+ pcm_debug_name(substream, name, sizeof(name));
+ for (cnt = 0, idx = log->idx; cnt < XRUN_LOG_CNT; cnt++) {
+ entry = &log->entries[idx];
+ if (entry->period_size == 0)
+ break;
+ snd_printd("hwptr log: %s: j=%lu, pos=%ld/%ld/%ld, "
+ "hwptr=%ld/%ld\n",
+ name, entry->jiffies, (unsigned long)entry->pos,
+ (unsigned long)entry->period_size,
+ (unsigned long)entry->buffer_size,
+ (unsigned long)entry->old_hw_ptr,
+ (unsigned long)entry->hw_ptr_base);
+ idx++;
+ idx %= XRUN_LOG_CNT;
+ }
+ log->hit = 1;
+}
+
+#else /* ! CONFIG_SND_PCM_XRUN_DEBUG */
+
+#define hw_ptr_error(substream, fmt, args...) do { } while (0)
+#define xrun_log(substream, pos) do { } while (0)
+#define xrun_log_show(substream) do { } while (0)
+
+#endif
+
+int snd_pcm_update_state(struct snd_pcm_substream *substream,
+ struct snd_pcm_runtime *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 (runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
+ if (avail >= runtime->buffer_size) {
+ snd_pcm_drain_done(substream);
+ return -EPIPE;
+ }
+ } else {
+ if (avail >= runtime->stop_threshold) {
+ xrun(substream);
+ return -EPIPE;
+ }
+ }
+ if (avail >= runtime->control->avail_min)
+ wake_up(runtime->twake ? &runtime->tsleep : &runtime->sleep);
+ return 0;
+}
+
+static int snd_pcm_update_hw_ptr0(struct snd_pcm_substream *substream,
+ unsigned int in_interrupt)
+{
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ snd_pcm_uframes_t pos;
+ snd_pcm_uframes_t old_hw_ptr, new_hw_ptr, hw_base;
+ snd_pcm_sframes_t hdelta, delta;
+ unsigned long jdelta;
+
+ old_hw_ptr = runtime->status->hw_ptr;
+ pos = substream->ops->pointer(substream);
+ if (pos == SNDRV_PCM_POS_XRUN) {
+ xrun(substream);
+ return -EPIPE;
+ }
+ if (pos >= runtime->buffer_size) {
+ if (printk_ratelimit()) {
+ char name[16];
+ pcm_debug_name(substream, name, sizeof(name));
+ xrun_log_show(substream);
+ snd_printd(KERN_ERR "BUG: %s, pos = %ld, "
+ "buffer size = %ld, period size = %ld\n",
+ name, pos, runtime->buffer_size,
+ runtime->period_size);
+ }
+ pos = 0;
+ }
+ pos -= pos % runtime->min_align;
+ if (xrun_debug(substream, XRUN_DEBUG_LOG))
+ xrun_log(substream, pos);
+ hw_base = runtime->hw_ptr_base;
+ new_hw_ptr = hw_base + pos;
+ if (in_interrupt) {
+ /* we know that one period was processed */
+ /* delta = "expected next hw_ptr" for in_interrupt != 0 */
+ delta = runtime->hw_ptr_interrupt + runtime->period_size;
+ if (delta > new_hw_ptr) {
+ hw_base += runtime->buffer_size;
+ if (hw_base >= runtime->boundary)
+ hw_base = 0;
+ new_hw_ptr = hw_base + pos;
+ goto __delta;
+ }
+ }
+ /* new_hw_ptr might be lower than old_hw_ptr in case when */
+ /* pointer crosses the end of the ring buffer */
+ if (new_hw_ptr < old_hw_ptr) {
+ hw_base += runtime->buffer_size;
+ if (hw_base >= runtime->boundary)
+ hw_base = 0;
+ new_hw_ptr = hw_base + pos;
+ }
+ __delta:
+ delta = (new_hw_ptr - old_hw_ptr) % runtime->boundary;
+ if (xrun_debug(substream, in_interrupt ?
+ XRUN_DEBUG_PERIODUPDATE : XRUN_DEBUG_HWPTRUPDATE)) {
+ char name[16];
+ pcm_debug_name(substream, name, sizeof(name));
+ snd_printd("%s_update: %s: pos=%u/%u/%u, "
+ "hwptr=%ld/%ld/%ld/%ld\n",
+ in_interrupt ? "period" : "hwptr",
+ name,
+ (unsigned int)pos,
+ (unsigned int)runtime->period_size,
+ (unsigned int)runtime->buffer_size,
+ (unsigned long)delta,
+ (unsigned long)old_hw_ptr,
+ (unsigned long)new_hw_ptr,
+ (unsigned long)runtime->hw_ptr_base);
+ }
+ /* something must be really wrong */
+ if (delta >= runtime->buffer_size + runtime->period_size) {
+ hw_ptr_error(substream,
+ "Unexpected hw_pointer value %s"
+ "(stream=%i, pos=%ld, new_hw_ptr=%ld, "
+ "old_hw_ptr=%ld)\n",
+ in_interrupt ? "[Q] " : "[P]",
+ substream->stream, (long)pos,
+ (long)new_hw_ptr, (long)old_hw_ptr);
+ return 0;
+ }
+
+ /* Do jiffies check only in xrun_debug mode */
+ if (!xrun_debug(substream, XRUN_DEBUG_JIFFIESCHECK))
+ goto no_jiffies_check;
+
+ /* Skip the jiffies check for hardwares with BATCH flag.
+ * Such hardware usually just increases the position at each IRQ,
+ * thus it can't give any strange position.
+ */
+ if (runtime->hw.info & SNDRV_PCM_INFO_BATCH)
+ goto no_jiffies_check;
+ hdelta = delta;
+ if (hdelta < runtime->delay)
+ goto no_jiffies_check;
+ hdelta -= runtime->delay;
+ jdelta = jiffies - runtime->hw_ptr_jiffies;
+ if (((hdelta * HZ) / runtime->rate) > jdelta + HZ/100) {
+ delta = jdelta /
+ (((runtime->period_size * HZ) / runtime->rate)
+ + HZ/100);
+ /* move new_hw_ptr according jiffies not pos variable */
+ new_hw_ptr = old_hw_ptr;
+ hw_base = delta;
+ /* use loop to avoid checks for delta overflows */
+ /* the delta value is small or zero in most cases */
+ while (delta > 0) {
+ new_hw_ptr += runtime->period_size;
+ if (new_hw_ptr >= runtime->boundary)
+ new_hw_ptr -= runtime->boundary;
+ delta--;
+ }
+ /* align hw_base to buffer_size */
+ hw_ptr_error(substream,
+ "hw_ptr skipping! %s"
+ "(pos=%ld, delta=%ld, period=%ld, "
+ "jdelta=%lu/%lu/%lu, hw_ptr=%ld/%ld)\n",
+ in_interrupt ? "[Q] " : "",
+ (long)pos, (long)hdelta,
+ (long)runtime->period_size, jdelta,
+ ((hdelta * HZ) / runtime->rate), hw_base,
+ (unsigned long)old_hw_ptr,
+ (unsigned long)new_hw_ptr);
+ /* reset values to proper state */
+ delta = 0;
+ hw_base = new_hw_ptr - (new_hw_ptr % runtime->buffer_size);
+ }
+ no_jiffies_check:
+ if (delta > runtime->period_size + runtime->period_size / 2) {
+ hw_ptr_error(substream,
+ "Lost interrupts? %s"
+ "(stream=%i, delta=%ld, new_hw_ptr=%ld, "
+ "old_hw_ptr=%ld)\n",
+ in_interrupt ? "[Q] " : "",
+ substream->stream, (long)delta,
+ (long)new_hw_ptr,
+ (long)old_hw_ptr);
+ }
+
+ if (runtime->status->hw_ptr == new_hw_ptr)
+ return 0;
+
+ if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
+ runtime->silence_size > 0)
+ snd_pcm_playback_silence(substream, new_hw_ptr);
+
+ if (in_interrupt) {
+ runtime->hw_ptr_interrupt = new_hw_ptr -
+ (new_hw_ptr % runtime->period_size);
+ }
+ runtime->hw_ptr_base = hw_base;
+ runtime->status->hw_ptr = new_hw_ptr;
+ runtime->hw_ptr_jiffies = jiffies;
+ if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE)
+ snd_pcm_gettime(runtime, (struct timespec *)&runtime->status->tstamp);
+
+ return snd_pcm_update_state(substream, runtime);
+}
+
+/* CAUTION: call it with irq disabled */
+int snd_pcm_update_hw_ptr(struct snd_pcm_substream *substream)
+{
+ return snd_pcm_update_hw_ptr0(substream, 0);
+}
+
+/**
+ * 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(struct snd_pcm *pcm, int direction, struct snd_pcm_ops *ops)
+{
+ struct snd_pcm_str *stream = &pcm->streams[direction];
+ struct snd_pcm_substream *substream;
+
+ for (substream = stream->substream; substream != NULL; substream = substream->next)
+ substream->ops = ops;
+}
+
+EXPORT_SYMBOL(snd_pcm_set_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(struct snd_pcm_substream *substream)
+{
+ struct snd_pcm_runtime *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;
+}
+
+EXPORT_SYMBOL(snd_pcm_set_sync);
+
+/*
+ * Standard ioctl routine
+ */
+
+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_BUG_ON(!n);
+ *r = 0;
+ return UINT_MAX;
+ }
+ n = div_u64_rem(n, c, r);
+ if (n >= UINT_MAX) {
+ *r = 0;
+ return UINT_MAX;
+ }
+ return n;
+}
+
+/**
+ * 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(struct snd_interval *i, const struct snd_interval *v)
+{
+ int changed = 0;
+ if (snd_BUG_ON(snd_interval_empty(i)))
+ return -EINVAL;
+ 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;
+}
+
+EXPORT_SYMBOL(snd_interval_refine);
+
+static int snd_interval_refine_first(struct snd_interval *i)
+{
+ if (snd_BUG_ON(snd_interval_empty(i)))
+ return -EINVAL;
+ 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(struct snd_interval *i)
+{
+ if (snd_BUG_ON(snd_interval_empty(i)))
+ return -EINVAL;
+ if (snd_interval_single(i))
+ return 0;
+ i->min = i->max;
+ i->openmin = i->openmax;
+ if (i->openmin)
+ i->min--;
+ return 1;
+}
+
+void snd_interval_mul(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *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
+ * @a: dividend
+ * @b: divisor
+ * @c: quotient
+ *
+ * c = a / b
+ *
+ * Returns non-zero if the value is changed, zero if not changed.
+ */
+void snd_interval_div(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *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
+ * @a: dividend 1
+ * @b: dividend 2
+ * @k: divisor (as integer)
+ * @c: result
+ *
+ * c = a * b / k
+ *
+ * Returns non-zero if the value is changed, zero if not changed.
+ */
+void snd_interval_muldivk(const struct snd_interval *a, const struct snd_interval *b,
+ unsigned int k, struct snd_interval *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
+ * @a: dividend 1
+ * @k: dividend 2 (as integer)
+ * @b: divisor
+ * @c: result
+ *
+ * c = a * k / b
+ *
+ * Returns non-zero if the value is changed, zero if not changed.
+ */
+void snd_interval_mulkdiv(const struct snd_interval *a, unsigned int k,
+ const struct snd_interval *b, struct snd_interval *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;
+}
+
+/* ---- */
+
+
+/**
+ * snd_interval_ratnum - refine the interval value
+ * @i: interval to refine
+ * @rats_count: number of ratnum_t
+ * @rats: ratnum_t array
+ * @nump: pointer to store the resultant numerator
+ * @denp: pointer to store the resultant denominator
+ *
+ * Returns non-zero if the value is changed, zero if not changed.
+ */
+int snd_interval_ratnum(struct snd_interval *i,
+ unsigned int rats_count, struct snd_ratnum *rats,
+ unsigned int *nump, unsigned int *denp)
+{
+ unsigned int best_num, best_den;
+ int best_diff;
+ unsigned int k;
+ struct snd_interval t;
+ int err;
+ unsigned int result_num, result_den;
+ int result_diff;
+
+ 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_up(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 (diff < 0)
+ diff = -diff;
+ 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);
+
+ result_num = best_num;
+ result_diff = best_diff;
+ result_den = 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_down(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 (diff < 0)
+ diff = -diff;
+ 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 (best_diff * result_den < result_diff * best_den) {
+ result_num = best_num;
+ result_den = best_den;
+ }
+ if (nump)
+ *nump = result_num;
+ if (denp)
+ *denp = result_den;
+ }
+ return err;
+}
+
+EXPORT_SYMBOL(snd_interval_ratnum);
+
+/**
+ * snd_interval_ratden - refine the interval value
+ * @i: interval to refine
+ * @rats_count: number of struct ratden
+ * @rats: struct ratden array
+ * @nump: pointer to store the resultant numerator
+ * @denp: pointer to store the resultant denominator
+ *
+ * Returns non-zero if the value is changed, zero if not changed.
+ */
+static int snd_interval_ratden(struct snd_interval *i,
+ unsigned int rats_count, struct snd_ratden *rats,
+ unsigned int *nump, unsigned int *denp)
+{
+ unsigned int best_num, best_diff, best_den;
+ unsigned int k;
+ struct snd_interval 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(struct snd_interval *i, unsigned int count, unsigned int *list, unsigned int mask)
+{
+ unsigned int k;
+ struct snd_interval list_range;
+
+ if (!count) {
+ i->empty = 1;
+ return -EINVAL;
+ }
+ snd_interval_any(&list_range);
+ list_range.min = UINT_MAX;
+ list_range.max = 0;
+ for (k = 0; k < count; k++) {
+ if (mask && !(mask & (1 << k)))
+ continue;
+ if (!snd_interval_test(i, list[k]))
+ continue;
+ list_range.min = min(list_range.min, list[k]);
+ list_range.max = max(list_range.max, list[k]);
+ }
+ return snd_interval_refine(i, &list_range);
+}
+
+EXPORT_SYMBOL(snd_interval_list);
+
+static int snd_interval_step(struct snd_interval *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(struct snd_pcm_runtime *runtime, unsigned int cond,
+ int var,
+ snd_pcm_hw_rule_func_t func, void *private,
+ int dep, ...)
+{
+ struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
+ struct snd_pcm_hw_rule *c;
+ unsigned int k;
+ va_list args;
+ va_start(args, dep);
+ if (constrs->rules_num >= constrs->rules_all) {
+ struct snd_pcm_hw_rule *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) {
+ if (snd_BUG_ON(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;
+}
+
+EXPORT_SYMBOL(snd_pcm_hw_rule_add);
+
+/**
+ * snd_pcm_hw_constraint_mask - apply the given bitmap mask constraint
+ * @runtime: PCM runtime instance
+ * @var: hw_params variable to apply the mask
+ * @mask: the bitmap mask
+ *
+ * Apply the constraint of the given bitmap mask to a 32-bit mask parameter.
+ */
+int snd_pcm_hw_constraint_mask(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
+ u_int32_t mask)
+{
+ struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
+ struct snd_mask *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 - apply the given bitmap mask constraint
+ * @runtime: PCM runtime instance
+ * @var: hw_params variable to apply the mask
+ * @mask: the 64bit bitmap mask
+ *
+ * Apply the constraint of the given bitmap mask to a 64-bit mask parameter.
+ */
+int snd_pcm_hw_constraint_mask64(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
+ u_int64_t mask)
+{
+ struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
+ struct snd_mask *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 - apply an integer constraint to an interval
+ * @runtime: PCM runtime instance
+ * @var: hw_params variable to apply the integer constraint
+ *
+ * Apply the constraint of integer to an interval parameter.
+ */
+int snd_pcm_hw_constraint_integer(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var)
+{
+ struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
+ return snd_interval_setinteger(constrs_interval(constrs, var));
+}
+
+EXPORT_SYMBOL(snd_pcm_hw_constraint_integer);
+
+/**
+ * snd_pcm_hw_constraint_minmax - apply a min/max range constraint to an interval
+ * @runtime: PCM runtime instance
+ * @var: hw_params variable to apply the range
+ * @min: the minimal value
+ * @max: the maximal value
+ *
+ * Apply the min/max range constraint to an interval parameter.
+ */
+int snd_pcm_hw_constraint_minmax(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
+ unsigned int min, unsigned int max)
+{
+ struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
+ struct snd_interval t;
+ t.min = min;
+ t.max = max;
+ t.openmin = t.openmax = 0;
+ t.integer = 0;
+ return snd_interval_refine(constrs_interval(constrs, var), &t);
+}
+
+EXPORT_SYMBOL(snd_pcm_hw_constraint_minmax);
+
+static int snd_pcm_hw_rule_list(struct snd_pcm_hw_params *params,
+ struct snd_pcm_hw_rule *rule)
+{
+ struct snd_pcm_hw_constraint_list *list = rule->private;
+ return snd_interval_list(hw_param_interval(params, rule->var), list->count, list->list, list->mask);
+}
+
+
+/**
+ * snd_pcm_hw_constraint_list - apply a list of constraints to a parameter
+ * @runtime: PCM runtime instance
+ * @cond: condition bits
+ * @var: hw_params variable to apply the list constraint
+ * @l: list
+ *
+ * Apply the list of constraints to an interval parameter.
+ */
+int snd_pcm_hw_constraint_list(struct snd_pcm_runtime *runtime,
+ unsigned int cond,
+ snd_pcm_hw_param_t var,
+ struct snd_pcm_hw_constraint_list *l)
+{
+ return snd_pcm_hw_rule_add(runtime, cond, var,
+ snd_pcm_hw_rule_list, l,
+ var, -1);
+}
+
+EXPORT_SYMBOL(snd_pcm_hw_constraint_list);
+
+static int snd_pcm_hw_rule_ratnums(struct snd_pcm_hw_params *params,
+ struct snd_pcm_hw_rule *rule)
+{
+ struct snd_pcm_hw_constraint_ratnums *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 - apply ratnums constraint to a parameter
+ * @runtime: PCM runtime instance
+ * @cond: condition bits
+ * @var: hw_params variable to apply the ratnums constraint
+ * @r: struct snd_ratnums constriants
+ */
+int snd_pcm_hw_constraint_ratnums(struct snd_pcm_runtime *runtime,
+ unsigned int cond,
+ snd_pcm_hw_param_t var,
+ struct snd_pcm_hw_constraint_ratnums *r)
+{
+ return snd_pcm_hw_rule_add(runtime, cond, var,
+ snd_pcm_hw_rule_ratnums, r,
+ var, -1);
+}
+
+EXPORT_SYMBOL(snd_pcm_hw_constraint_ratnums);
+
+static int snd_pcm_hw_rule_ratdens(struct snd_pcm_hw_params *params,
+ struct snd_pcm_hw_rule *rule)
+{
+ struct snd_pcm_hw_constraint_ratdens *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 - apply ratdens constraint to a parameter
+ * @runtime: PCM runtime instance
+ * @cond: condition bits
+ * @var: hw_params variable to apply the ratdens constraint
+ * @r: struct snd_ratdens constriants
+ */
+int snd_pcm_hw_constraint_ratdens(struct snd_pcm_runtime *runtime,
+ unsigned int cond,
+ snd_pcm_hw_param_t var,
+ struct snd_pcm_hw_constraint_ratdens *r)
+{
+ return snd_pcm_hw_rule_add(runtime, cond, var,
+ snd_pcm_hw_rule_ratdens, r,
+ var, -1);
+}
+
+EXPORT_SYMBOL(snd_pcm_hw_constraint_ratdens);
+
+static int snd_pcm_hw_rule_msbits(struct snd_pcm_hw_params *params,
+ struct snd_pcm_hw_rule *rule)
+{
+ unsigned int l = (unsigned long) rule->private;
+ int width = l & 0xffff;
+ unsigned int msbits = l >> 16;
+ struct snd_interval *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 - add a hw constraint msbits rule
+ * @runtime: PCM runtime instance
+ * @cond: condition bits
+ * @width: sample bits width
+ * @msbits: msbits width
+ */
+int snd_pcm_hw_constraint_msbits(struct snd_pcm_runtime *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);
+}
+
+EXPORT_SYMBOL(snd_pcm_hw_constraint_msbits);
+
+static int snd_pcm_hw_rule_step(struct snd_pcm_hw_params *params,
+ struct snd_pcm_hw_rule *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 - add a hw constraint step rule
+ * @runtime: PCM runtime instance
+ * @cond: condition bits
+ * @var: hw_params variable to apply the step constraint
+ * @step: step size
+ */
+int snd_pcm_hw_constraint_step(struct snd_pcm_runtime *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);
+}
+
+EXPORT_SYMBOL(snd_pcm_hw_constraint_step);
+
+static int snd_pcm_hw_rule_pow2(struct snd_pcm_hw_params *params, struct snd_pcm_hw_rule *rule)
+{
+ static unsigned 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 - add a hw constraint power-of-2 rule
+ * @runtime: PCM runtime instance
+ * @cond: condition bits
+ * @var: hw_params variable to apply the power-of-2 constraint
+ */
+int snd_pcm_hw_constraint_pow2(struct snd_pcm_runtime *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);
+}
+
+EXPORT_SYMBOL(snd_pcm_hw_constraint_pow2);
+
+static void _snd_pcm_hw_param_any(struct snd_pcm_hw_params *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();
+}
+
+void _snd_pcm_hw_params_any(struct snd_pcm_hw_params *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;
+}
+
+EXPORT_SYMBOL(_snd_pcm_hw_params_any);
+
+/**
+ * snd_pcm_hw_param_value - return @params field @var value
+ * @params: the hw_params instance
+ * @var: parameter to retrieve
+ * @dir: pointer to the direction (-1,0,1) or %NULL
+ *
+ * Return the value for field @var if it's fixed in configuration space
+ * defined by @params. Return -%EINVAL otherwise.
+ */
+int snd_pcm_hw_param_value(const struct snd_pcm_hw_params *params,
+ snd_pcm_hw_param_t var, int *dir)
+{
+ if (hw_is_mask(var)) {
+ const struct snd_mask *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 struct snd_interval *i = hw_param_interval_c(params, var);
+ if (!snd_interval_single(i))
+ return -EINVAL;
+ if (dir)
+ *dir = i->openmin;
+ return snd_interval_value(i);
+ }
+ return -EINVAL;
+}
+
+EXPORT_SYMBOL(snd_pcm_hw_param_value);
+
+void _snd_pcm_hw_param_setempty(struct snd_pcm_hw_params *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();
+ }
+}
+
+EXPORT_SYMBOL(_snd_pcm_hw_param_setempty);
+
+static int _snd_pcm_hw_param_first(struct snd_pcm_hw_params *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
+ return -EINVAL;
+ if (changed) {
+ params->cmask |= 1 << var;
+ params->rmask |= 1 << var;
+ }
+ return changed;
+}
+
+
+/**
+ * snd_pcm_hw_param_first - refine config space and return minimum value
+ * @pcm: PCM instance
+ * @params: the hw_params instance
+ * @var: parameter to retrieve
+ * @dir: pointer to the direction (-1,0,1) or %NULL
+ *
+ * Inside configuration space defined by @params remove from @var all
+ * values > minimum. Reduce configuration space accordingly.
+ * Return the minimum.
+ */
+int snd_pcm_hw_param_first(struct snd_pcm_substream *pcm,
+ struct snd_pcm_hw_params *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);
+ if (snd_BUG_ON(err < 0))
+ return err;
+ }
+ return snd_pcm_hw_param_value(params, var, dir);
+}
+
+EXPORT_SYMBOL(snd_pcm_hw_param_first);
+
+static int _snd_pcm_hw_param_last(struct snd_pcm_hw_params *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
+ return -EINVAL;
+ if (changed) {
+ params->cmask |= 1 << var;
+ params->rmask |= 1 << var;
+ }
+ return changed;
+}
+
+
+/**
+ * snd_pcm_hw_param_last - refine config space and return maximum value
+ * @pcm: PCM instance
+ * @params: the hw_params instance
+ * @var: parameter to retrieve
+ * @dir: pointer to the direction (-1,0,1) or %NULL
+ *
+ * Inside configuration space defined by @params remove from @var all
+ * values < maximum. Reduce configuration space accordingly.
+ * Return the maximum.
+ */
+int snd_pcm_hw_param_last(struct snd_pcm_substream *pcm,
+ struct snd_pcm_hw_params *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);
+ if (snd_BUG_ON(err < 0))
+ return err;
+ }
+ return snd_pcm_hw_param_value(params, var, dir);
+}
+
+EXPORT_SYMBOL(snd_pcm_hw_param_last);
+
+/**
+ * snd_pcm_hw_param_choose - choose a configuration defined by @params
+ * @pcm: PCM instance
+ * @params: the hw_params instance
+ *
+ * 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(struct snd_pcm_substream *pcm,
+ struct snd_pcm_hw_params *params)
+{
+ static int vars[] = {
+ SNDRV_PCM_HW_PARAM_ACCESS,
+ SNDRV_PCM_HW_PARAM_FORMAT,
+ SNDRV_PCM_HW_PARAM_SUBFORMAT,
+ SNDRV_PCM_HW_PARAM_CHANNELS,
+ SNDRV_PCM_HW_PARAM_RATE,
+ SNDRV_PCM_HW_PARAM_PERIOD_TIME,
+ SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
+ SNDRV_PCM_HW_PARAM_TICK_TIME,
+ -1
+ };
+ int err, *v;
+
+ for (v = vars; *v != -1; v++) {
+ if (*v != SNDRV_PCM_HW_PARAM_BUFFER_SIZE)
+ err = snd_pcm_hw_param_first(pcm, params, *v, NULL);
+ else
+ err = snd_pcm_hw_param_last(pcm, params, *v, NULL);
+ if (snd_BUG_ON(err < 0))
+ return err;
+ }
+ return 0;
+}
+
+static int snd_pcm_lib_ioctl_reset(struct snd_pcm_substream *substream,
+ void *arg)
+{
+ struct snd_pcm_runtime *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(struct snd_pcm_substream *substream,
+ void *arg)
+{
+ struct snd_pcm_channel_info *info = arg;
+ struct snd_pcm_runtime *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;
+}
+
+static int snd_pcm_lib_ioctl_fifo_size(struct snd_pcm_substream *substream,
+ void *arg)
+{
+ struct snd_pcm_hw_params *params = arg;
+ snd_pcm_format_t format;
+ int channels, width;
+
+ params->fifo_size = substream->runtime->hw.fifo_size;
+ if (!(substream->runtime->hw.info & SNDRV_PCM_INFO_FIFO_IN_FRAMES)) {
+ format = params_format(params);
+ channels = params_channels(params);
+ width = snd_pcm_format_physical_width(format);
+ params->fifo_size /= width * channels;
+ }
+ 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(struct snd_pcm_substream *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);
+ case SNDRV_PCM_IOCTL1_FIFO_SIZE:
+ return snd_pcm_lib_ioctl_fifo_size(substream, arg);
+ }
+ return -ENXIO;
+}
+
+EXPORT_SYMBOL(snd_pcm_lib_ioctl);
+
+/**
+ * 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, 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(struct snd_pcm_substream *substream)
+{
+ struct snd_pcm_runtime *runtime;
+ unsigned long flags;
+
+ if (PCM_RUNTIME_CHECK(substream))
+ return;
+ runtime = substream->runtime;
+
+ if (runtime->transfer_ack_begin)
+ runtime->transfer_ack_begin(substream);
+
+ //giovanni snd_pcm_stream_lock_irqsave(substream, flags); //giovanni
+ if (!snd_pcm_running(substream) ||
+ snd_pcm_update_hw_ptr0(substream, 1) < 0)
+ goto _end;
+
+ if (substream->timer_running)
+ snd_timer_interrupt(substream->timer, 1);
+ _end:
+ //giovanni snd_pcm_stream_unlock_irqrestore(substream, flags); //giovanni
+ if (runtime->transfer_ack_end)
+ runtime->transfer_ack_end(substream);
+ kill_fasync(&runtime->fasync, SIGIO, POLL_IN);
+}
+
+EXPORT_SYMBOL(snd_pcm_period_elapsed);
+
+/*
+ * Wait until avail_min data becomes available
+ * Returns a negative error code if any error occurs during operation.
+ * The available space is stored on availp. When err = 0 and avail = 0
+ * on the capture stream, it indicates the stream is in DRAINING state.
+ */
+static int wait_for_avail_min(struct snd_pcm_substream *substream,
+ snd_pcm_uframes_t *availp)
+{
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ int is_playback = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
+ wait_queue_t wait;
+ int err = 0;
+ snd_pcm_uframes_t avail = 0;
+ long tout;
+
+ init_waitqueue_entry(&wait, current);
+ add_wait_queue(&runtime->tsleep, &wait);
+ for (;;) {
+ if (signal_pending(current)) {
+ err = -ERESTARTSYS;
+ break;
+ }
+ set_current_state(TASK_INTERRUPTIBLE);
+ //giovanni snd_pcm_stream_unlock_irq(substream);
+ tout = schedule_timeout(msecs_to_jiffies(10000));
+ //giovanni snd_pcm_stream_lock_irq(substream);
+ switch (runtime->status->state) {
+ case SNDRV_PCM_STATE_SUSPENDED:
+ err = -ESTRPIPE;
+ goto _endloop;
+ case SNDRV_PCM_STATE_XRUN:
+ err = -EPIPE;
+ goto _endloop;
+ case SNDRV_PCM_STATE_DRAINING:
+ if (is_playback)
+ err = -EPIPE;
+ else
+ avail = 0; /* indicate draining */
+ goto _endloop;
+ case SNDRV_PCM_STATE_OPEN:
+ case SNDRV_PCM_STATE_SETUP:
+ case SNDRV_PCM_STATE_DISCONNECTED:
+ err = -EBADFD;
+ goto _endloop;
+ }
+ if (!tout) {
+ snd_printd("%s write error (DMA or IRQ trouble?)\n",
+ is_playback ? "playback" : "capture");
+ err = -EIO;
+ break;
+ }
+ if (is_playback)
+ avail = snd_pcm_playback_avail(runtime);
+ else
+ avail = snd_pcm_capture_avail(runtime);
+ if (avail >= runtime->control->avail_min)
+ break;
+ }
+ _endloop:
+ remove_wait_queue(&runtime->tsleep, &wait);
+ *availp = avail;
+ return err;
+}
+
+static int snd_pcm_lib_write_transfer(struct snd_pcm_substream *substream,
+ unsigned int hwoff,
+ unsigned long data, unsigned int off,
+ snd_pcm_uframes_t frames)
+{
+ struct snd_pcm_runtime *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);
+ if (copy_from_user(hwbuf, buf, frames_to_bytes(runtime, frames)))
+ return -EFAULT;
+ }
+ return 0;
+}
+
+typedef int (*transfer_f)(struct snd_pcm_substream *substream, unsigned int hwoff,
+ unsigned long data, unsigned int off,
+ snd_pcm_uframes_t size);
+
+static snd_pcm_sframes_t snd_pcm_lib_write1(struct snd_pcm_substream *substream,
+ unsigned long data,
+ snd_pcm_uframes_t size,
+ int nonblock,
+ transfer_f transfer)
+{
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ snd_pcm_uframes_t xfer = 0;
+ snd_pcm_uframes_t offset = 0;
+ int err = 0;
+
+ if (size == 0)
+ return 0;
+
+ //giovanni 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;
+ }
+
+ runtime->twake = 1;
+ while (size > 0) {
+ snd_pcm_uframes_t frames, appl_ptr, appl_ofs;
+ snd_pcm_uframes_t avail;
+ snd_pcm_uframes_t cont;
+ if (runtime->status->state == SNDRV_PCM_STATE_RUNNING)
+ snd_pcm_update_hw_ptr(substream);
+ avail = snd_pcm_playback_avail(runtime);
+ if (!avail) {
+ if (nonblock) {
+ err = -EAGAIN;
+ goto _end_unlock;
+ }
+ err = wait_for_avail_min(substream, &avail);
+ if (err < 0)
+ goto _end_unlock;
+ }
+ frames = size > avail ? avail : size;
+ cont = runtime->buffer_size - runtime->control->appl_ptr % runtime->buffer_size;
+ if (frames > cont)
+ frames = cont;
+ if (snd_BUG_ON(!frames)) {
+ runtime->twake = 0;
+ //giovanni snd_pcm_stream_unlock_irq(substream);
+ return -EINVAL;
+ }
+ appl_ptr = runtime->control->appl_ptr;
+ appl_ofs = appl_ptr % runtime->buffer_size;
+ //giovanni snd_pcm_stream_unlock_irq(substream);
+ err = transfer(substream, appl_ofs, data, offset, frames);
+ //giovanni snd_pcm_stream_lock_irq(substream);
+ if (err < 0)
+ goto _end_unlock;
+ 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;
+ }
+ }
+ _end_unlock:
+ runtime->twake = 0;
+ if (xfer > 0 && err >= 0)
+ snd_pcm_update_state(substream, runtime);
+ //giovanni snd_pcm_stream_unlock_irq(substream);
+ return xfer > 0 ? (snd_pcm_sframes_t)xfer : err;
+}
+
+/* sanity-check for read/write methods */
+static int pcm_sanity_check(struct snd_pcm_substream *substream)
+{
+ struct snd_pcm_runtime *runtime;
+ if (PCM_RUNTIME_CHECK(substream))
+ return -ENXIO;
+ runtime = substream->runtime;
+ if (snd_BUG_ON(!substream->ops->copy && !runtime->dma_area))
+ return -EINVAL;
+ if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
+ return -EBADFD;
+ return 0;
+}
+
+snd_pcm_sframes_t snd_pcm_lib_write(struct snd_pcm_substream *substream, const void __user *buf, snd_pcm_uframes_t size)
+{
+ struct snd_pcm_runtime *runtime;
+ int nonblock;
+ int err;
+
+ err = pcm_sanity_check(substream);
+ if (err < 0)
+ return err;
+ runtime = substream->runtime;
+ nonblock = !!(substream->f_flags & O_NONBLOCK);
+
+ 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);
+}
+
+EXPORT_SYMBOL(snd_pcm_lib_write);
+
+static int snd_pcm_lib_writev_transfer(struct snd_pcm_substream *substream,
+ unsigned int hwoff,
+ unsigned long data, unsigned int off,
+ snd_pcm_uframes_t frames)
+{
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ int err;
+ void __user **bufs = (void __user **)data;
+ int channels = runtime->channels;
+ int c;
+ if (substream->ops->copy) {
+ if (snd_BUG_ON(!substream->ops->silence))
+ 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;
+ 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(struct snd_pcm_substream *substream,
+ void __user **bufs,
+ snd_pcm_uframes_t frames)
+{
+ struct snd_pcm_runtime *runtime;
+ int nonblock;
+ int err;
+
+ err = pcm_sanity_check(substream);
+ if (err < 0)
+ return err;
+ runtime = substream->runtime;
+ nonblock = !!(substream->f_flags & O_NONBLOCK);
+
+ 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);
+}
+
+EXPORT_SYMBOL(snd_pcm_lib_writev);
+
+static int snd_pcm_lib_read_transfer(struct snd_pcm_substream *substream,
+ unsigned int hwoff,
+ unsigned long data, unsigned int off,
+ snd_pcm_uframes_t frames)
+{
+ struct snd_pcm_runtime *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);
+ if (copy_to_user(buf, hwbuf, frames_to_bytes(runtime, frames)))
+ return -EFAULT;
+ }
+ return 0;
+}
+
+static snd_pcm_sframes_t snd_pcm_lib_read1(struct snd_pcm_substream *substream,
+ unsigned long data,
+ snd_pcm_uframes_t size,
+ int nonblock,
+ transfer_f transfer)
+{
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ snd_pcm_uframes_t xfer = 0;
+ snd_pcm_uframes_t offset = 0;
+ int err = 0;
+
+ if (size == 0)
+ return 0;
+
+ //giovanni 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;
+ }
+
+ runtime->twake = 1;
+ while (size > 0) {
+ snd_pcm_uframes_t frames, appl_ptr, appl_ofs;
+ snd_pcm_uframes_t avail;
+ snd_pcm_uframes_t cont;
+ if (runtime->status->state == SNDRV_PCM_STATE_RUNNING)
+ snd_pcm_update_hw_ptr(substream);
+ avail = snd_pcm_capture_avail(runtime);
+ if (!avail) {
+ if (runtime->status->state ==
+ SNDRV_PCM_STATE_DRAINING) {
+ snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
+ goto _end_unlock;
+ }
+ if (nonblock) {
+ err = -EAGAIN;
+ goto _end_unlock;
+ }
+ err = wait_for_avail_min(substream, &avail);
+ if (err < 0)
+ goto _end_unlock;
+ if (!avail)
+ continue; /* draining */
+ }
+ frames = size > avail ? avail : size;
+ cont = runtime->buffer_size - runtime->control->appl_ptr % runtime->buffer_size;
+ if (frames > cont)
+ frames = cont;
+ if (snd_BUG_ON(!frames)) {
+ runtime->twake = 0;
+ //giovanni snd_pcm_stream_unlock_irq(substream);
+ return -EINVAL;
+ }
+ appl_ptr = runtime->control->appl_ptr;
+ appl_ofs = appl_ptr % runtime->buffer_size;
+ //giovanni snd_pcm_stream_unlock_irq(substream);
+ err = transfer(substream, appl_ofs, data, offset, frames);
+ //giovanni snd_pcm_stream_lock_irq(substream);
+ if (err < 0)
+ goto _end_unlock;
+ 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;
+ }
+ _end_unlock:
+ runtime->twake = 0;
+ if (xfer > 0 && err >= 0)
+ snd_pcm_update_state(substream, runtime);
+ //giovanni snd_pcm_stream_unlock_irq(substream);
+ return xfer > 0 ? (snd_pcm_sframes_t)xfer : err;
+}
+
+snd_pcm_sframes_t snd_pcm_lib_read(struct snd_pcm_substream *substream, void __user *buf, snd_pcm_uframes_t size)
+{
+ struct snd_pcm_runtime *runtime;
+ int nonblock;
+ int err;
+
+ err = pcm_sanity_check(substream);
+ if (err < 0)
+ return err;
+ runtime = substream->runtime;
+ nonblock = !!(substream->f_flags & O_NONBLOCK);
+ 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);
+}
+
+EXPORT_SYMBOL(snd_pcm_lib_read);
+
+static int snd_pcm_lib_readv_transfer(struct snd_pcm_substream *substream,
+ unsigned int hwoff,
+ unsigned long data, unsigned int off,
+ snd_pcm_uframes_t frames)
+{
+ struct snd_pcm_runtime *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;
+ 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(struct snd_pcm_substream *substream,
+ void __user **bufs,
+ snd_pcm_uframes_t frames)
+{
+ struct snd_pcm_runtime *runtime;
+ int nonblock;
+ int err;
+
+ err = pcm_sanity_check(substream);
+ if (err < 0)
+ return err;
+ runtime = substream->runtime;
+ if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
+ return -EBADFD;
+
+ nonblock = !!(substream->f_flags & O_NONBLOCK);
+ 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);
+}
+
+EXPORT_SYMBOL(snd_pcm_lib_readv);
--- /dev/null
+/*
+ * Digital Audio (PCM) abstract layer
+ * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
+ *
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ */
+
+#include <linux/mm.h>
+#include <linux/file.h>
+#include <linux/slab.h>
+#include <linux/smp_lock.h>
+#include <linux/time.h>
+#include <linux/pm_qos_params.h>
+#include <linux/uio.h>
+#include <linux/dma-mapping.h>
+#include <linux/math64.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>
+#include <sound/minors.h>
+#include <asm/io.h>
+
+/*
+ * Compatibility
+ */
+
+struct snd_pcm_hw_params_old {
+ unsigned int flags;
+ unsigned int masks[SNDRV_PCM_HW_PARAM_SUBFORMAT -
+ SNDRV_PCM_HW_PARAM_ACCESS + 1];
+ struct snd_interval intervals[SNDRV_PCM_HW_PARAM_TICK_TIME -
+ SNDRV_PCM_HW_PARAM_SAMPLE_BITS + 1];
+ unsigned int rmask;
+ unsigned int cmask;
+ unsigned int info;
+ unsigned int msbits;
+ unsigned int rate_num;
+ unsigned int rate_den;
+ snd_pcm_uframes_t fifo_size;
+ unsigned char reserved[64];
+};
+
+#ifdef CONFIG_SND_SUPPORT_OLD_API
+#define SNDRV_PCM_IOCTL_HW_REFINE_OLD _IOWR('A', 0x10, struct snd_pcm_hw_params_old)
+#define SNDRV_PCM_IOCTL_HW_PARAMS_OLD _IOWR('A', 0x11, struct snd_pcm_hw_params_old)
+
+static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
+ struct snd_pcm_hw_params_old __user * _oparams);
+static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
+ struct snd_pcm_hw_params_old __user * _oparams);
+#endif
+static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream);
+
+/*
+ *
+ */
+
+DEFINE_RWLOCK(snd_pcm_link_rwlock);
+EXPORT_SYMBOL(snd_pcm_link_rwlock);
+
+static DECLARE_RWSEM(snd_pcm_link_rwsem);
+
+static inline mm_segment_t snd_enter_user(void)
+{
+ mm_segment_t fs = get_fs();
+ set_fs(get_ds());
+ return fs;
+}
+
+static inline void snd_leave_user(mm_segment_t fs)
+{
+ set_fs(fs);
+}
+
+
+
+int snd_pcm_info(struct snd_pcm_substream *substream, struct snd_pcm_info *info)
+{
+ struct snd_pcm_runtime *runtime;
+ struct snd_pcm *pcm = substream->pcm;
+ struct snd_pcm_str *pstr = substream->pstr;
+
+ memset(info, 0, sizeof(*info));
+ info->card = pcm->card->number;
+ info->device = pcm->device;
+ info->stream = substream->stream;
+ info->subdevice = substream->number;
+ strlcpy(info->id, pcm->id, sizeof(info->id));
+ strlcpy(info->name, pcm->name, sizeof(info->name));
+ info->dev_class = pcm->dev_class;
+ info->dev_subclass = pcm->dev_subclass;
+ info->subdevices_count = pstr->substream_count;
+ info->subdevices_avail = pstr->substream_count - pstr->substream_opened;
+ strlcpy(info->subname, substream->name, sizeof(info->subname));
+ runtime = substream->runtime;
+ /* AB: FIXME!!! This is definitely nonsense */
+ if (runtime) {
+ info->sync = runtime->sync;
+ substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_INFO, info);
+ }
+ return 0;
+}
+
+int snd_pcm_info_user(struct snd_pcm_substream *substream,
+ struct snd_pcm_info __user * _info)
+{
+ struct snd_pcm_info *info;
+ int err;
+
+ info = kmalloc(sizeof(*info), GFP_KERNEL);
+ if (! info)
+ return -ENOMEM;
+ err = snd_pcm_info(substream, info);
+ if (err >= 0) {
+ if (copy_to_user(_info, info, sizeof(*info)))
+ err = -EFAULT;
+ }
+ kfree(info);
+ return err;
+}
+
+#undef RULES_DEBUG
+
+#ifdef RULES_DEBUG
+#define HW_PARAM(v) [SNDRV_PCM_HW_PARAM_##v] = #v
+char *snd_pcm_hw_param_names[] = {
+ HW_PARAM(ACCESS),
+ HW_PARAM(FORMAT),
+ HW_PARAM(SUBFORMAT),
+ HW_PARAM(SAMPLE_BITS),
+ HW_PARAM(FRAME_BITS),
+ HW_PARAM(CHANNELS),
+ HW_PARAM(RATE),
+ HW_PARAM(PERIOD_TIME),
+ HW_PARAM(PERIOD_SIZE),
+ HW_PARAM(PERIOD_BYTES),
+ HW_PARAM(PERIODS),
+ HW_PARAM(BUFFER_TIME),
+ HW_PARAM(BUFFER_SIZE),
+ HW_PARAM(BUFFER_BYTES),
+ HW_PARAM(TICK_TIME),
+};
+#endif
+
+int snd_pcm_hw_refine(struct snd_pcm_substream *substream,
+ struct snd_pcm_hw_params *params)
+{
+ unsigned int k;
+ struct snd_pcm_hardware *hw;
+ struct snd_interval *i = NULL;
+ struct snd_mask *m = NULL;
+ struct snd_pcm_hw_constraints *constrs = &substream->runtime->hw_constraints;
+ unsigned int rstamps[constrs->rules_num];
+ unsigned int vstamps[SNDRV_PCM_HW_PARAM_LAST_INTERVAL + 1];
+ unsigned int stamp = 2;
+ int changed, again;
+
+ params->info = 0;
+ params->fifo_size = 0;
+ if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_SAMPLE_BITS))
+ params->msbits = 0;
+ if (params->rmask & (1 << SNDRV_PCM_HW_PARAM_RATE)) {
+ params->rate_num = 0;
+ params->rate_den = 0;
+ }
+
+ for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
+ m = hw_param_mask(params, k);
+ if (snd_mask_empty(m))
+ return -EINVAL;
+ if (!(params->rmask & (1 << k)))
+ continue;
+#ifdef RULES_DEBUG
+ printk(KERN_DEBUG "%s = ", snd_pcm_hw_param_names[k]);
+ printk("%04x%04x%04x%04x -> ", m->bits[3], m->bits[2], m->bits[1], m->bits[0]);
+#endif
+ changed = snd_mask_refine(m, constrs_mask(constrs, k));
+#ifdef RULES_DEBUG
+ printk("%04x%04x%04x%04x\n", m->bits[3], m->bits[2], m->bits[1], m->bits[0]);
+#endif
+ if (changed)
+ params->cmask |= 1 << k;
+ if (changed < 0)
+ return changed;
+ }
+
+ for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
+ i = hw_param_interval(params, k);
+ if (snd_interval_empty(i))
+ return -EINVAL;
+ if (!(params->rmask & (1 << k)))
+ continue;
+#ifdef RULES_DEBUG
+ printk(KERN_DEBUG "%s = ", snd_pcm_hw_param_names[k]);
+ if (i->empty)
+ printk("empty");
+ else
+ printk("%c%u %u%c",
+ i->openmin ? '(' : '[', i->min,
+ i->max, i->openmax ? ')' : ']');
+ printk(" -> ");
+#endif
+ changed = snd_interval_refine(i, constrs_interval(constrs, k));
+#ifdef RULES_DEBUG
+ if (i->empty)
+ printk("empty\n");
+ else
+ printk("%c%u %u%c\n",
+ i->openmin ? '(' : '[', i->min,
+ i->max, i->openmax ? ')' : ']');
+#endif
+ if (changed)
+ params->cmask |= 1 << k;
+ if (changed < 0)
+ return changed;
+ }
+
+ for (k = 0; k < constrs->rules_num; k++)
+ rstamps[k] = 0;
+ for (k = 0; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++)
+ vstamps[k] = (params->rmask & (1 << k)) ? 1 : 0;
+ do {
+ again = 0;
+ for (k = 0; k < constrs->rules_num; k++) {
+ struct snd_pcm_hw_rule *r = &constrs->rules[k];
+ unsigned int d;
+ int doit = 0;
+ if (r->cond && !(r->cond & params->flags))
+ continue;
+ for (d = 0; r->deps[d] >= 0; d++) {
+ if (vstamps[r->deps[d]] > rstamps[k]) {
+ doit = 1;
+ break;
+ }
+ }
+ if (!doit)
+ continue;
+#ifdef RULES_DEBUG
+ printk(KERN_DEBUG "Rule %d [%p]: ", k, r->func);
+ if (r->var >= 0) {
+ printk("%s = ", snd_pcm_hw_param_names[r->var]);
+ if (hw_is_mask(r->var)) {
+ m = hw_param_mask(params, r->var);
+ printk("%x", *m->bits);
+ } else {
+ i = hw_param_interval(params, r->var);
+ if (i->empty)
+ printk("empty");
+ else
+ printk("%c%u %u%c",
+ i->openmin ? '(' : '[', i->min,
+ i->max, i->openmax ? ')' : ']');
+ }
+ }
+#endif
+ changed = r->func(params, r);
+#ifdef RULES_DEBUG
+ if (r->var >= 0) {
+ printk(" -> ");
+ if (hw_is_mask(r->var))
+ printk("%x", *m->bits);
+ else {
+ if (i->empty)
+ printk("empty");
+ else
+ printk("%c%u %u%c",
+ i->openmin ? '(' : '[', i->min,
+ i->max, i->openmax ? ')' : ']');
+ }
+ }
+ printk("\n");
+#endif
+ rstamps[k] = stamp;
+ if (changed && r->var >= 0) {
+ params->cmask |= (1 << r->var);
+ vstamps[r->var] = stamp;
+ again = 1;
+ }
+ if (changed < 0)
+ return changed;
+ stamp++;
+ }
+ } while (again);
+ if (!params->msbits) {
+ i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS);
+ if (snd_interval_single(i))
+ params->msbits = snd_interval_value(i);
+ }
+
+ if (!params->rate_den) {
+ i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
+ if (snd_interval_single(i)) {
+ params->rate_num = snd_interval_value(i);
+ params->rate_den = 1;
+ }
+ }
+
+ hw = &substream->runtime->hw;
+ if (!params->info)
+ params->info = hw->info & ~SNDRV_PCM_INFO_FIFO_IN_FRAMES;
+ if (!params->fifo_size) {
+ m = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
+ i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_CHANNELS);
+ if (snd_mask_min(m) == snd_mask_max(m) &&
+ snd_interval_min(i) == snd_interval_max(i)) {
+ changed = substream->ops->ioctl(substream,
+ SNDRV_PCM_IOCTL1_FIFO_SIZE, params);
+ if (changed < 0)
+ return changed;
+ }
+ }
+ params->rmask = 0;
+ return 0;
+}
+
+EXPORT_SYMBOL(snd_pcm_hw_refine);
+
+static int snd_pcm_hw_refine_user(struct snd_pcm_substream *substream,
+ struct snd_pcm_hw_params __user * _params)
+{
+ struct snd_pcm_hw_params *params;
+ int err;
+
+ params = memdup_user(_params, sizeof(*params));
+ if (IS_ERR(params))
+ return PTR_ERR(params);
+
+ err = snd_pcm_hw_refine(substream, params);
+ if (copy_to_user(_params, params, sizeof(*params))) {
+ if (!err)
+ err = -EFAULT;
+ }
+
+ kfree(params);
+ return err;
+}
+
+static int period_to_usecs(struct snd_pcm_runtime *runtime)
+{
+ int usecs;
+
+ if (! runtime->rate)
+ return -1; /* invalid */
+
+ /* take 75% of period time as the deadline */
+ usecs = (750000 / runtime->rate) * runtime->period_size;
+ usecs += ((750000 % runtime->rate) * runtime->period_size) /
+ runtime->rate;
+
+ return usecs;
+}
+
+static int calc_boundary(struct snd_pcm_runtime *runtime)
+{
+ u_int64_t boundary;
+
+ boundary = (u_int64_t)runtime->buffer_size *
+ (u_int64_t)runtime->period_size;
+#if BITS_PER_LONG < 64
+ /* try to find lowest common multiple for buffer and period */
+ if (boundary > LONG_MAX - runtime->buffer_size) {
+ u_int32_t remainder = -1;
+ u_int32_t divident = runtime->buffer_size;
+ u_int32_t divisor = runtime->period_size;
+ while (remainder) {
+ remainder = divident % divisor;
+ if (remainder) {
+ divident = divisor;
+ divisor = remainder;
+ }
+ }
+ boundary = div_u64(boundary, divisor);
+ if (boundary > LONG_MAX - runtime->buffer_size)
+ return -ERANGE;
+ }
+#endif
+ if (boundary == 0)
+ return -ERANGE;
+ runtime->boundary = boundary;
+ while (runtime->boundary * 2 <= LONG_MAX - runtime->buffer_size)
+ runtime->boundary *= 2;
+ return 0;
+}
+
+static int snd_pcm_hw_params(struct snd_pcm_substream *substream,
+ struct snd_pcm_hw_params *params)
+{
+ struct snd_pcm_runtime *runtime;
+ int err, usecs;
+ unsigned int bits;
+ snd_pcm_uframes_t frames;
+
+ if (PCM_RUNTIME_CHECK(substream))
+ return -ENXIO;
+ runtime = substream->runtime;
+ snd_pcm_stream_lock_irq(substream);
+ switch (runtime->status->state) {
+ case SNDRV_PCM_STATE_OPEN:
+ case SNDRV_PCM_STATE_SETUP:
+ case SNDRV_PCM_STATE_PREPARED:
+ break;
+ default:
+ snd_pcm_stream_unlock_irq(substream);
+ return -EBADFD;
+ }
+ snd_pcm_stream_unlock_irq(substream);
+#if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE)
+ if (!substream->oss.oss)
+#endif
+ if (atomic_read(&substream->mmap_count))
+ return -EBADFD;
+
+ params->rmask = ~0U;
+ err = snd_pcm_hw_refine(substream, params);
+ if (err < 0)
+ goto _error;
+
+ err = snd_pcm_hw_params_choose(substream, params);
+ if (err < 0)
+ goto _error;
+
+ if (substream->ops->hw_params != NULL) {
+ err = substream->ops->hw_params(substream, params);
+ if (err < 0)
+ goto _error;
+ }
+
+ runtime->access = params_access(params);
+ runtime->format = params_format(params);
+ runtime->subformat = params_subformat(params);
+ runtime->channels = params_channels(params);
+ runtime->rate = params_rate(params);
+ runtime->period_size = params_period_size(params);
+ runtime->periods = params_periods(params);
+ runtime->buffer_size = params_buffer_size(params);
+ runtime->info = params->info;
+ runtime->rate_num = params->rate_num;
+ runtime->rate_den = params->rate_den;
+
+ bits = snd_pcm_format_physical_width(runtime->format);
+ runtime->sample_bits = bits;
+ bits *= runtime->channels;
+ runtime->frame_bits = bits;
+ frames = 1;
+ while (bits % 8 != 0) {
+ bits *= 2;
+ frames *= 2;
+ }
+ runtime->byte_align = bits / 8;
+ runtime->min_align = frames;
+
+ /* Default sw params */
+ runtime->tstamp_mode = SNDRV_PCM_TSTAMP_NONE;
+ runtime->period_step = 1;
+ runtime->control->avail_min = runtime->period_size;
+ runtime->start_threshold = 1;
+ runtime->stop_threshold = runtime->buffer_size;
+ runtime->silence_threshold = 0;
+ runtime->silence_size = 0;
+ err = calc_boundary(runtime);
+ if (err < 0)
+ goto _error;
+
+ snd_pcm_timer_resolution_change(substream);
+ runtime->status->state = SNDRV_PCM_STATE_SETUP;
+
+ pm_qos_remove_requirement(PM_QOS_CPU_DMA_LATENCY,
+ substream->latency_id);
+ if ((usecs = period_to_usecs(runtime)) >= 0)
+ pm_qos_add_requirement(PM_QOS_CPU_DMA_LATENCY,
+ substream->latency_id, usecs);
+ return 0;
+ _error:
+ /* hardware might be unuseable from this time,
+ so we force application to retry to set
+ the correct hardware parameter settings */
+ runtime->status->state = SNDRV_PCM_STATE_OPEN;
+ if (substream->ops->hw_free != NULL)
+ substream->ops->hw_free(substream);
+ return err;
+}
+
+static int snd_pcm_hw_params_user(struct snd_pcm_substream *substream,
+ struct snd_pcm_hw_params __user * _params)
+{
+ struct snd_pcm_hw_params *params;
+ int err;
+
+ params = memdup_user(_params, sizeof(*params));
+ if (IS_ERR(params))
+ return PTR_ERR(params);
+
+ err = snd_pcm_hw_params(substream, params);
+ if (copy_to_user(_params, params, sizeof(*params))) {
+ if (!err)
+ err = -EFAULT;
+ }
+
+ kfree(params);
+ return err;
+}
+
+static int snd_pcm_hw_free(struct snd_pcm_substream *substream)
+{
+ struct snd_pcm_runtime *runtime;
+ int result = 0;
+
+ if (PCM_RUNTIME_CHECK(substream))
+ return -ENXIO;
+ runtime = substream->runtime;
+ snd_pcm_stream_lock_irq(substream);
+ switch (runtime->status->state) {
+ case SNDRV_PCM_STATE_SETUP:
+ case SNDRV_PCM_STATE_PREPARED:
+ break;
+ default:
+ snd_pcm_stream_unlock_irq(substream);
+ return -EBADFD;
+ }
+ snd_pcm_stream_unlock_irq(substream);
+ if (atomic_read(&substream->mmap_count))
+ return -EBADFD;
+ if (substream->ops->hw_free)
+ result = substream->ops->hw_free(substream);
+ runtime->status->state = SNDRV_PCM_STATE_OPEN;
+ pm_qos_remove_requirement(PM_QOS_CPU_DMA_LATENCY,
+ substream->latency_id);
+ return result;
+}
+
+static int snd_pcm_sw_params(struct snd_pcm_substream *substream,
+ struct snd_pcm_sw_params *params)
+{
+ struct snd_pcm_runtime *runtime;
+ int err;
+
+ if (PCM_RUNTIME_CHECK(substream))
+ return -ENXIO;
+ runtime = substream->runtime;
+ snd_pcm_stream_lock_irq(substream);
+ if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
+ snd_pcm_stream_unlock_irq(substream);
+ return -EBADFD;
+ }
+ snd_pcm_stream_unlock_irq(substream);
+
+ if (params->tstamp_mode > SNDRV_PCM_TSTAMP_LAST)
+ return -EINVAL;
+ if (params->avail_min == 0)
+ return -EINVAL;
+ if (params->silence_size >= runtime->boundary) {
+ if (params->silence_threshold != 0)
+ return -EINVAL;
+ } else {
+ if (params->silence_size > params->silence_threshold)
+ return -EINVAL;
+ if (params->silence_threshold > runtime->buffer_size)
+ return -EINVAL;
+ }
+ err = 0;
+ snd_pcm_stream_lock_irq(substream);
+ runtime->tstamp_mode = params->tstamp_mode;
+ runtime->period_step = params->period_step;
+ runtime->control->avail_min = params->avail_min;
+ runtime->start_threshold = params->start_threshold;
+ runtime->stop_threshold = params->stop_threshold;
+ runtime->silence_threshold = params->silence_threshold;
+ runtime->silence_size = params->silence_size;
+ params->boundary = runtime->boundary;
+ if (snd_pcm_running(substream)) {
+ if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
+ runtime->silence_size > 0)
+ snd_pcm_playback_silence(substream, ULONG_MAX);
+ err = snd_pcm_update_state(substream, runtime);
+ }
+ snd_pcm_stream_unlock_irq(substream);
+ return err;
+}
+
+static int snd_pcm_sw_params_user(struct snd_pcm_substream *substream,
+ struct snd_pcm_sw_params __user * _params)
+{
+ struct snd_pcm_sw_params params;
+ int err;
+ if (copy_from_user(¶ms, _params, sizeof(params)))
+ return -EFAULT;
+ err = snd_pcm_sw_params(substream, ¶ms);
+ if (copy_to_user(_params, ¶ms, sizeof(params)))
+ return -EFAULT;
+ return err;
+}
+
+int snd_pcm_status(struct snd_pcm_substream *substream,
+ struct snd_pcm_status *status)
+{
+ struct snd_pcm_runtime *runtime = substream->runtime;
+
+ //giovanni snd_pcm_stream_lock_irq(substream);
+ status->state = runtime->status->state;
+ status->suspended_state = runtime->status->suspended_state;
+ if (status->state == SNDRV_PCM_STATE_OPEN)
+ goto _end;
+ status->trigger_tstamp = runtime->trigger_tstamp;
+ if (snd_pcm_running(substream)) {
+ snd_pcm_update_hw_ptr(substream);
+ if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE) {
+ status->tstamp = runtime->status->tstamp;
+ goto _tstamp_end;
+ }
+ }
+ snd_pcm_gettime(runtime, &status->tstamp);
+ _tstamp_end:
+ status->appl_ptr = runtime->control->appl_ptr;
+ status->hw_ptr = runtime->status->hw_ptr;
+ if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
+ status->avail = snd_pcm_playback_avail(runtime);
+ if (runtime->status->state == SNDRV_PCM_STATE_RUNNING ||
+ runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
+ status->delay = runtime->buffer_size - status->avail;
+ status->delay += runtime->delay;
+ } else
+ status->delay = 0;
+ } else {
+ status->avail = snd_pcm_capture_avail(runtime);
+ if (runtime->status->state == SNDRV_PCM_STATE_RUNNING)
+ status->delay = status->avail + runtime->delay;
+ else
+ status->delay = 0;
+ }
+ status->avail_max = runtime->avail_max;
+ status->overrange = runtime->overrange;
+ runtime->avail_max = 0;
+ runtime->overrange = 0;
+ _end:
+ //giovanni snd_pcm_stream_unlock_irq(substream);
+ return 0;
+}
+
+static int snd_pcm_status_user(struct snd_pcm_substream *substream,
+ struct snd_pcm_status __user * _status)
+{
+ struct snd_pcm_status status;
+ int res;
+
+ memset(&status, 0, sizeof(status));
+ res = snd_pcm_status(substream, &status);
+ if (res < 0)
+ return res;
+ if (copy_to_user(_status, &status, sizeof(status)))
+ return -EFAULT;
+ return 0;
+}
+
+static int snd_pcm_channel_info(struct snd_pcm_substream *substream,
+ struct snd_pcm_channel_info * info)
+{
+ struct snd_pcm_runtime *runtime;
+ unsigned int channel;
+
+ channel = info->channel;
+ runtime = substream->runtime;
+ //giovanni snd_pcm_stream_lock_irq(substream);
+ if (runtime->status->state == SNDRV_PCM_STATE_OPEN) {
+ //giovanni snd_pcm_stream_unlock_irq(substream);
+ return -EBADFD;
+ }
+ //giovanni snd_pcm_stream_unlock_irq(substream);
+ if (channel >= runtime->channels)
+ return -EINVAL;
+ memset(info, 0, sizeof(*info));
+ info->channel = channel;
+ return substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_CHANNEL_INFO, info);
+}
+
+static int snd_pcm_channel_info_user(struct snd_pcm_substream *substream,
+ struct snd_pcm_channel_info __user * _info)
+{
+ struct snd_pcm_channel_info info;
+ int res;
+
+ if (copy_from_user(&info, _info, sizeof(info)))
+ return -EFAULT;
+ res = snd_pcm_channel_info(substream, &info);
+ if (res < 0)
+ return res;
+ if (copy_to_user(_info, &info, sizeof(info)))
+ return -EFAULT;
+ return 0;
+}
+
+static void snd_pcm_trigger_tstamp(struct snd_pcm_substream *substream)
+{
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ if (runtime->trigger_master == NULL)
+ return;
+ if (runtime->trigger_master == substream) {
+ snd_pcm_gettime(runtime, &runtime->trigger_tstamp);
+ } else {
+ snd_pcm_trigger_tstamp(runtime->trigger_master);
+ runtime->trigger_tstamp = runtime->trigger_master->runtime->trigger_tstamp;
+ }
+ runtime->trigger_master = NULL;
+}
+
+struct action_ops {
+ int (*pre_action)(struct snd_pcm_substream *substream, int state);
+ int (*do_action)(struct snd_pcm_substream *substream, int state);
+ void (*undo_action)(struct snd_pcm_substream *substream, int state);
+ void (*post_action)(struct snd_pcm_substream *substream, int state);
+};
+
+/*
+ * this functions is core for handling of linked stream
+ * Note: the stream state might be changed also on failure
+ * Note2: call with calling stream lock + link lock
+ */
+static int snd_pcm_action_group(struct action_ops *ops,
+ struct snd_pcm_substream *substream,
+ int state, int do_lock)
+{
+ struct snd_pcm_substream *s = NULL;
+ struct snd_pcm_substream *s1;
+ int res = 0;
+
+ snd_pcm_group_for_each_entry(s, substream) {
+ if (do_lock && s != substream)
+ spin_lock_nested(&s->self_group.lock,
+ SINGLE_DEPTH_NESTING);
+ res = ops->pre_action(s, state);
+ if (res < 0)
+ goto _unlock;
+ }
+ snd_pcm_group_for_each_entry(s, substream) {
+ res = ops->do_action(s, state);
+ if (res < 0) {
+ if (ops->undo_action) {
+ snd_pcm_group_for_each_entry(s1, substream) {
+ if (s1 == s) /* failed stream */
+ break;
+ ops->undo_action(s1, state);
+ }
+ }
+ s = NULL; /* unlock all */
+ goto _unlock;
+ }
+ }
+ snd_pcm_group_for_each_entry(s, substream) {
+ ops->post_action(s, state);
+ }
+ _unlock:
+ if (do_lock) {
+ /* unlock streams */
+ snd_pcm_group_for_each_entry(s1, substream) {
+ if (s1 != substream)
+ spin_unlock(&s1->self_group.lock);
+ if (s1 == s) /* end */
+ break;
+ }
+ }
+ return res;
+}
+
+/*
+ * Note: call with stream lock
+ */
+static int snd_pcm_action_single(struct action_ops *ops,
+ struct snd_pcm_substream *substream,
+ int state)
+{
+ int res;
+
+ res = ops->pre_action(substream, state);
+ if (res < 0)
+ return res;
+ res = ops->do_action(substream, state);
+ if (res == 0)
+ ops->post_action(substream, state);
+ else if (ops->undo_action)
+ ops->undo_action(substream, state);
+ return res;
+}
+
+/*
+ * Note: call with stream lock
+ */
+static int snd_pcm_action(struct action_ops *ops,
+ struct snd_pcm_substream *substream,
+ int state)
+{
+ int res;
+
+ if (snd_pcm_stream_linked(substream)) {
+ if (!spin_trylock(&substream->group->lock)) {
+ spin_unlock(&substream->self_group.lock);
+ spin_lock(&substream->group->lock);
+ spin_lock(&substream->self_group.lock);
+ }
+ res = snd_pcm_action_group(ops, substream, state, 1);
+ spin_unlock(&substream->group->lock);
+ } else {
+ res = snd_pcm_action_single(ops, substream, state);
+ }
+ return res;
+}
+
+/*
+ * Note: don't use any locks before
+ */
+static int snd_pcm_action_lock_irq(struct action_ops *ops,
+ struct snd_pcm_substream *substream,
+ int state)
+{
+ int res;
+
+ read_lock_irq(&snd_pcm_link_rwlock);
+ if (snd_pcm_stream_linked(substream)) {
+ spin_lock(&substream->group->lock);
+ spin_lock(&substream->self_group.lock);
+ res = snd_pcm_action_group(ops, substream, state, 1);
+ spin_unlock(&substream->self_group.lock);
+ spin_unlock(&substream->group->lock);
+ } else {
+ spin_lock(&substream->self_group.lock);
+ res = snd_pcm_action_single(ops, substream, state);
+ spin_unlock(&substream->self_group.lock);
+ }
+ read_unlock_irq(&snd_pcm_link_rwlock);
+ return res;
+}
+
+/*
+ */
+static int snd_pcm_action_nonatomic(struct action_ops *ops,
+ struct snd_pcm_substream *substream,
+ int state)
+{
+ int res;
+
+ down_read(&snd_pcm_link_rwsem);
+ if (snd_pcm_stream_linked(substream))
+ res = snd_pcm_action_group(ops, substream, state, 0);
+ else
+ res = snd_pcm_action_single(ops, substream, state);
+ up_read(&snd_pcm_link_rwsem);
+ return res;
+}
+
+/*
+ * start callbacks
+ */
+static int snd_pcm_pre_start(struct snd_pcm_substream *substream, int state)
+{
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ if (runtime->status->state != SNDRV_PCM_STATE_PREPARED)
+ return -EBADFD;
+ if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
+ !snd_pcm_playback_data(substream))
+ return -EPIPE;
+ runtime->trigger_master = substream;
+ return 0;
+}
+
+static int snd_pcm_do_start(struct snd_pcm_substream *substream, int state)
+{
+ if (substream->runtime->trigger_master != substream)
+ return 0;
+ return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_START);
+}
+
+static void snd_pcm_undo_start(struct snd_pcm_substream *substream, int state)
+{
+ if (substream->runtime->trigger_master == substream)
+ substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
+}
+
+static void snd_pcm_post_start(struct snd_pcm_substream *substream, int state)
+{
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ snd_pcm_trigger_tstamp(substream);
+ runtime->hw_ptr_jiffies = jiffies;
+ runtime->status->state = state;
+ if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
+ runtime->silence_size > 0)
+ snd_pcm_playback_silence(substream, ULONG_MAX);
+ if (substream->timer)
+ snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSTART,
+ &runtime->trigger_tstamp);
+}
+
+static struct action_ops snd_pcm_action_start = {
+ .pre_action = snd_pcm_pre_start,
+ .do_action = snd_pcm_do_start,
+ .undo_action = snd_pcm_undo_start,
+ .post_action = snd_pcm_post_start
+};
+
+/**
+ * snd_pcm_start - start all linked streams
+ * @substream: the PCM substream instance
+ */
+int snd_pcm_start(struct snd_pcm_substream *substream)
+{
+ return snd_pcm_action(&snd_pcm_action_start, substream,
+ SNDRV_PCM_STATE_RUNNING);
+}
+
+/*
+ * stop callbacks
+ */
+static int snd_pcm_pre_stop(struct snd_pcm_substream *substream, int state)
+{
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
+ return -EBADFD;
+ runtime->trigger_master = substream;
+ return 0;
+}
+
+static int snd_pcm_do_stop(struct snd_pcm_substream *substream, int state)
+{
+ if (substream->runtime->trigger_master == substream &&
+ snd_pcm_running(substream))
+ substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_STOP);
+ return 0; /* unconditonally stop all substreams */
+}
+
+static void snd_pcm_post_stop(struct snd_pcm_substream *substream, int state)
+{
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ if (runtime->status->state != state) {
+ snd_pcm_trigger_tstamp(substream);
+ if (substream->timer)
+ snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSTOP,
+ &runtime->trigger_tstamp);
+ runtime->status->state = state;
+ }
+ wake_up(&runtime->sleep);
+ wake_up(&runtime->tsleep);
+}
+
+static struct action_ops snd_pcm_action_stop = {
+ .pre_action = snd_pcm_pre_stop,
+ .do_action = snd_pcm_do_stop,
+ .post_action = snd_pcm_post_stop
+};
+
+/**
+ * snd_pcm_stop - try to stop all running streams in the substream group
+ * @substream: the PCM substream instance
+ * @state: PCM state after stopping the stream
+ *
+ * The state of each stream is then changed to the given state unconditionally.
+ */
+int snd_pcm_stop(struct snd_pcm_substream *substream, int state)
+{
+ return snd_pcm_action(&snd_pcm_action_stop, substream, state);
+}
+
+EXPORT_SYMBOL(snd_pcm_stop);
+
+/**
+ * snd_pcm_drain_done - stop the DMA only when the given stream is playback
+ * @substream: the PCM substream
+ *
+ * After stopping, the state is changed to SETUP.
+ * Unlike snd_pcm_stop(), this affects only the given stream.
+ */
+int snd_pcm_drain_done(struct snd_pcm_substream *substream)
+{
+ return snd_pcm_action_single(&snd_pcm_action_stop, substream,
+ SNDRV_PCM_STATE_SETUP);
+}
+
+/*
+ * pause callbacks
+ */
+static int snd_pcm_pre_pause(struct snd_pcm_substream *substream, int push)
+{
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ if (!(runtime->info & SNDRV_PCM_INFO_PAUSE))
+ return -ENOSYS;
+ if (push) {
+ if (runtime->status->state != SNDRV_PCM_STATE_RUNNING)
+ return -EBADFD;
+ } else if (runtime->status->state != SNDRV_PCM_STATE_PAUSED)
+ return -EBADFD;
+ runtime->trigger_master = substream;
+ return 0;
+}
+
+static int snd_pcm_do_pause(struct snd_pcm_substream *substream, int push)
+{
+ if (substream->runtime->trigger_master != substream)
+ return 0;
+ /* The jiffies check in snd_pcm_update_hw_ptr*() is done by
+ * a delta betwen the current jiffies, this gives a large enough
+ * delta, effectively to skip the check once.
+ */
+ substream->runtime->hw_ptr_jiffies = jiffies - HZ * 1000;
+ return substream->ops->trigger(substream,
+ push ? SNDRV_PCM_TRIGGER_PAUSE_PUSH :
+ SNDRV_PCM_TRIGGER_PAUSE_RELEASE);
+}
+
+static void snd_pcm_undo_pause(struct snd_pcm_substream *substream, int push)
+{
+ if (substream->runtime->trigger_master == substream)
+ substream->ops->trigger(substream,
+ push ? SNDRV_PCM_TRIGGER_PAUSE_RELEASE :
+ SNDRV_PCM_TRIGGER_PAUSE_PUSH);
+}
+
+static void snd_pcm_post_pause(struct snd_pcm_substream *substream, int push)
+{
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ snd_pcm_trigger_tstamp(substream);
+ if (push) {
+ runtime->status->state = SNDRV_PCM_STATE_PAUSED;
+ if (substream->timer)
+ snd_timer_notify(substream->timer,
+ SNDRV_TIMER_EVENT_MPAUSE,
+ &runtime->trigger_tstamp);
+ wake_up(&runtime->sleep);
+ wake_up(&runtime->tsleep);
+ } else {
+ runtime->status->state = SNDRV_PCM_STATE_RUNNING;
+ if (substream->timer)
+ snd_timer_notify(substream->timer,
+ SNDRV_TIMER_EVENT_MCONTINUE,
+ &runtime->trigger_tstamp);
+ }
+}
+
+static struct action_ops snd_pcm_action_pause = {
+ .pre_action = snd_pcm_pre_pause,
+ .do_action = snd_pcm_do_pause,
+ .undo_action = snd_pcm_undo_pause,
+ .post_action = snd_pcm_post_pause
+};
+
+/*
+ * Push/release the pause for all linked streams.
+ */
+static int snd_pcm_pause(struct snd_pcm_substream *substream, int push)
+{
+ return snd_pcm_action(&snd_pcm_action_pause, substream, push);
+}
+
+#ifdef CONFIG_PM
+/* suspend */
+
+static int snd_pcm_pre_suspend(struct snd_pcm_substream *substream, int state)
+{
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
+ return -EBUSY;
+ runtime->trigger_master = substream;
+ return 0;
+}
+
+static int snd_pcm_do_suspend(struct snd_pcm_substream *substream, int state)
+{
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ if (runtime->trigger_master != substream)
+ return 0;
+ if (! snd_pcm_running(substream))
+ return 0;
+ substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
+ return 0; /* suspend unconditionally */
+}
+
+static void snd_pcm_post_suspend(struct snd_pcm_substream *substream, int state)
+{
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ snd_pcm_trigger_tstamp(substream);
+ if (substream->timer)
+ snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MSUSPEND,
+ &runtime->trigger_tstamp);
+ runtime->status->suspended_state = runtime->status->state;
+ runtime->status->state = SNDRV_PCM_STATE_SUSPENDED;
+ wake_up(&runtime->sleep);
+ wake_up(&runtime->tsleep);
+}
+
+static struct action_ops snd_pcm_action_suspend = {
+ .pre_action = snd_pcm_pre_suspend,
+ .do_action = snd_pcm_do_suspend,
+ .post_action = snd_pcm_post_suspend
+};
+
+/**
+ * snd_pcm_suspend - trigger SUSPEND to all linked streams
+ * @substream: the PCM substream
+ *
+ * After this call, all streams are changed to SUSPENDED state.
+ */
+int snd_pcm_suspend(struct snd_pcm_substream *substream)
+{
+ int err;
+ unsigned long flags;
+
+ if (! substream)
+ return 0;
+
+ snd_pcm_stream_lock_irqsave(substream, flags);
+ err = snd_pcm_action(&snd_pcm_action_suspend, substream, 0);
+ snd_pcm_stream_unlock_irqrestore(substream, flags);
+ return err;
+}
+
+EXPORT_SYMBOL(snd_pcm_suspend);
+
+/**
+ * snd_pcm_suspend_all - trigger SUSPEND to all substreams in the given pcm
+ * @pcm: the PCM instance
+ *
+ * After this call, all streams are changed to SUSPENDED state.
+ */
+int snd_pcm_suspend_all(struct snd_pcm *pcm)
+{
+ struct snd_pcm_substream *substream;
+ int stream, err = 0;
+
+ if (! pcm)
+ return 0;
+
+ for (stream = 0; stream < 2; stream++) {
+ for (substream = pcm->streams[stream].substream;
+ substream; substream = substream->next) {
+ /* FIXME: the open/close code should lock this as well */
+ if (substream->runtime == NULL)
+ continue;
+ err = snd_pcm_suspend(substream);
+ if (err < 0 && err != -EBUSY)
+ return err;
+ }
+ }
+ return 0;
+}
+
+EXPORT_SYMBOL(snd_pcm_suspend_all);
+
+/* resume */
+
+static int snd_pcm_pre_resume(struct snd_pcm_substream *substream, int state)
+{
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ if (!(runtime->info & SNDRV_PCM_INFO_RESUME))
+ return -ENOSYS;
+ runtime->trigger_master = substream;
+ return 0;
+}
+
+static int snd_pcm_do_resume(struct snd_pcm_substream *substream, int state)
+{
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ if (runtime->trigger_master != substream)
+ return 0;
+ /* DMA not running previously? */
+ if (runtime->status->suspended_state != SNDRV_PCM_STATE_RUNNING &&
+ (runtime->status->suspended_state != SNDRV_PCM_STATE_DRAINING ||
+ substream->stream != SNDRV_PCM_STREAM_PLAYBACK))
+ return 0;
+ return substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_RESUME);
+}
+
+static void snd_pcm_undo_resume(struct snd_pcm_substream *substream, int state)
+{
+ if (substream->runtime->trigger_master == substream &&
+ snd_pcm_running(substream))
+ substream->ops->trigger(substream, SNDRV_PCM_TRIGGER_SUSPEND);
+}
+
+static void snd_pcm_post_resume(struct snd_pcm_substream *substream, int state)
+{
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ snd_pcm_trigger_tstamp(substream);
+ if (substream->timer)
+ snd_timer_notify(substream->timer, SNDRV_TIMER_EVENT_MRESUME,
+ &runtime->trigger_tstamp);
+ runtime->status->state = runtime->status->suspended_state;
+}
+
+static struct action_ops snd_pcm_action_resume = {
+ .pre_action = snd_pcm_pre_resume,
+ .do_action = snd_pcm_do_resume,
+ .undo_action = snd_pcm_undo_resume,
+ .post_action = snd_pcm_post_resume
+};
+
+static int snd_pcm_resume(struct snd_pcm_substream *substream)
+{
+ struct snd_card *card = substream->pcm->card;
+ int res;
+
+ snd_power_lock(card);
+ if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0)
+ res = snd_pcm_action_lock_irq(&snd_pcm_action_resume, substream, 0);
+ snd_power_unlock(card);
+ return res;
+}
+
+#else
+
+static int snd_pcm_resume(struct snd_pcm_substream *substream)
+{
+ return -ENOSYS;
+}
+
+#endif /* CONFIG_PM */
+
+/*
+ * xrun ioctl
+ *
+ * Change the RUNNING stream(s) to XRUN state.
+ */
+static int snd_pcm_xrun(struct snd_pcm_substream *substream)
+{
+ struct snd_card *card = substream->pcm->card;
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ int result;
+
+ snd_power_lock(card);
+ if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
+ result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
+ if (result < 0)
+ goto _unlock;
+ }
+
+ snd_pcm_stream_lock_irq(substream);
+ switch (runtime->status->state) {
+ case SNDRV_PCM_STATE_XRUN:
+ result = 0; /* already there */
+ break;
+ case SNDRV_PCM_STATE_RUNNING:
+ result = snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
+ break;
+ default:
+ result = -EBADFD;
+ }
+ snd_pcm_stream_unlock_irq(substream);
+ _unlock:
+ snd_power_unlock(card);
+ return result;
+}
+
+/*
+ * reset ioctl
+ */
+static int snd_pcm_pre_reset(struct snd_pcm_substream *substream, int state)
+{
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ switch (runtime->status->state) {
+ case SNDRV_PCM_STATE_RUNNING:
+ case SNDRV_PCM_STATE_PREPARED:
+ case SNDRV_PCM_STATE_PAUSED:
+ case SNDRV_PCM_STATE_SUSPENDED:
+ return 0;
+ default:
+ return -EBADFD;
+ }
+}
+
+static int snd_pcm_do_reset(struct snd_pcm_substream *substream, int state)
+{
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ int err = substream->ops->ioctl(substream, SNDRV_PCM_IOCTL1_RESET, NULL);
+ if (err < 0)
+ return err;
+ runtime->hw_ptr_base = 0;
+ runtime->hw_ptr_interrupt = runtime->status->hw_ptr -
+ runtime->status->hw_ptr % runtime->period_size;
+ runtime->silence_start = runtime->status->hw_ptr;
+ runtime->silence_filled = 0;
+ return 0;
+}
+
+static void snd_pcm_post_reset(struct snd_pcm_substream *substream, int state)
+{
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ runtime->control->appl_ptr = runtime->status->hw_ptr;
+ if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
+ runtime->silence_size > 0)
+ snd_pcm_playback_silence(substream, ULONG_MAX);
+}
+
+static struct action_ops snd_pcm_action_reset = {
+ .pre_action = snd_pcm_pre_reset,
+ .do_action = snd_pcm_do_reset,
+ .post_action = snd_pcm_post_reset
+};
+
+static int snd_pcm_reset(struct snd_pcm_substream *substream)
+{
+ return snd_pcm_action_nonatomic(&snd_pcm_action_reset, substream, 0);
+}
+
+/*
+ * prepare ioctl
+ */
+/* we use the second argument for updating f_flags */
+static int snd_pcm_pre_prepare(struct snd_pcm_substream *substream,
+ int f_flags)
+{
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
+ runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED)
+ return -EBADFD;
+ if (snd_pcm_running(substream))
+ return -EBUSY;
+ substream->f_flags = f_flags;
+ return 0;
+}
+
+static int snd_pcm_do_prepare(struct snd_pcm_substream *substream, int state)
+{
+ int err;
+ err = substream->ops->prepare(substream);
+ if (err < 0)
+ return err;
+ return snd_pcm_do_reset(substream, 0);
+}
+
+static void snd_pcm_post_prepare(struct snd_pcm_substream *substream, int state)
+{
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ runtime->control->appl_ptr = runtime->status->hw_ptr;
+ runtime->status->state = SNDRV_PCM_STATE_PREPARED;
+}
+
+static struct action_ops snd_pcm_action_prepare = {
+ .pre_action = snd_pcm_pre_prepare,
+ .do_action = snd_pcm_do_prepare,
+ .post_action = snd_pcm_post_prepare
+};
+
+/**
+ * snd_pcm_prepare - prepare the PCM substream to be triggerable
+ * @substream: the PCM substream instance
+ * @file: file to refer f_flags
+ */
+static int snd_pcm_prepare(struct snd_pcm_substream *substream,
+ struct file *file)
+{
+ int res;
+ struct snd_card *card = substream->pcm->card;
+ int f_flags;
+
+ if (file)
+ f_flags = file->f_flags;
+ else
+ f_flags = substream->f_flags;
+
+ snd_power_lock(card);
+ if ((res = snd_power_wait(card, SNDRV_CTL_POWER_D0)) >= 0)
+ res = snd_pcm_action_nonatomic(&snd_pcm_action_prepare,
+ substream, f_flags);
+ snd_power_unlock(card);
+ return res;
+}
+
+/*
+ * drain ioctl
+ */
+
+static int snd_pcm_pre_drain_init(struct snd_pcm_substream *substream, int state)
+{
+ substream->runtime->trigger_master = substream;
+ return 0;
+}
+
+static int snd_pcm_do_drain_init(struct snd_pcm_substream *substream, int state)
+{
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
+ switch (runtime->status->state) {
+ case SNDRV_PCM_STATE_PREPARED:
+ /* start playback stream if possible */
+ if (! snd_pcm_playback_empty(substream)) {
+ snd_pcm_do_start(substream, SNDRV_PCM_STATE_DRAINING);
+ snd_pcm_post_start(substream, SNDRV_PCM_STATE_DRAINING);
+ }
+ break;
+ case SNDRV_PCM_STATE_RUNNING:
+ runtime->status->state = SNDRV_PCM_STATE_DRAINING;
+ break;
+ default:
+ break;
+ }
+ } else {
+ /* stop running stream */
+ if (runtime->status->state == SNDRV_PCM_STATE_RUNNING) {
+ int new_state = snd_pcm_capture_avail(runtime) > 0 ?
+ SNDRV_PCM_STATE_DRAINING : SNDRV_PCM_STATE_SETUP;
+ snd_pcm_do_stop(substream, new_state);
+ snd_pcm_post_stop(substream, new_state);
+ }
+ }
+ return 0;
+}
+
+static void snd_pcm_post_drain_init(struct snd_pcm_substream *substream, int state)
+{
+}
+
+static struct action_ops snd_pcm_action_drain_init = {
+ .pre_action = snd_pcm_pre_drain_init,
+ .do_action = snd_pcm_do_drain_init,
+ .post_action = snd_pcm_post_drain_init
+};
+
+static int snd_pcm_drop(struct snd_pcm_substream *substream);
+
+/*
+ * Drain the stream(s).
+ * When the substream is linked, sync until the draining of all playback streams
+ * is finished.
+ * After this call, all streams are supposed to be either SETUP or DRAINING
+ * (capture only) state.
+ */
+static int snd_pcm_drain(struct snd_pcm_substream *substream,
+ struct file *file)
+{
+ struct snd_card *card;
+ struct snd_pcm_runtime *runtime;
+ struct snd_pcm_substream *s;
+ wait_queue_t wait;
+ int result = 0;
+ int nonblock = 0;
+
+ card = substream->pcm->card;
+ runtime = substream->runtime;
+
+ if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
+ return -EBADFD;
+
+ snd_power_lock(card);
+ if (runtime->status->state == SNDRV_PCM_STATE_SUSPENDED) {
+ result = snd_power_wait(card, SNDRV_CTL_POWER_D0);
+ if (result < 0) {
+ snd_power_unlock(card);
+ return result;
+ }
+ }
+
+ if (file) {
+ if (file->f_flags & O_NONBLOCK)
+ nonblock = 1;
+ } else if (substream->f_flags & O_NONBLOCK)
+ nonblock = 1;
+
+ down_read(&snd_pcm_link_rwsem);
+ snd_pcm_stream_lock_irq(substream);
+ /* resume pause */
+ if (runtime->status->state == SNDRV_PCM_STATE_PAUSED)
+ snd_pcm_pause(substream, 0);
+
+ /* pre-start/stop - all running streams are changed to DRAINING state */
+ result = snd_pcm_action(&snd_pcm_action_drain_init, substream, 0);
+ if (result < 0)
+ goto unlock;
+ /* in non-blocking, we don't wait in ioctl but let caller poll */
+ if (nonblock) {
+ result = -EAGAIN;
+ goto unlock;
+ }
+
+ for (;;) {
+ long tout;
+ struct snd_pcm_runtime *to_check;
+ if (signal_pending(current)) {
+ result = -ERESTARTSYS;
+ break;
+ }
+ /* find a substream to drain */
+ to_check = NULL;
+ snd_pcm_group_for_each_entry(s, substream) {
+ if (s->stream != SNDRV_PCM_STREAM_PLAYBACK)
+ continue;
+ runtime = s->runtime;
+ if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
+ to_check = runtime;
+ break;
+ }
+ }
+ if (!to_check)
+ break; /* all drained */
+ init_waitqueue_entry(&wait, current);
+ add_wait_queue(&to_check->sleep, &wait);
+ set_current_state(TASK_INTERRUPTIBLE);
+ snd_pcm_stream_unlock_irq(substream);
+ up_read(&snd_pcm_link_rwsem);
+ snd_power_unlock(card);
+ tout = schedule_timeout(10 * HZ);
+ snd_power_lock(card);
+ down_read(&snd_pcm_link_rwsem);
+ snd_pcm_stream_lock_irq(substream);
+ remove_wait_queue(&to_check->sleep, &wait);
+ if (tout == 0) {
+ if (substream->runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
+ result = -ESTRPIPE;
+ else {
+ snd_printd("playback drain error (DMA or IRQ trouble?)\n");
+ snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
+ result = -EIO;
+ }
+ break;
+ }
+ }
+
+ unlock:
+ snd_pcm_stream_unlock_irq(substream);
+ up_read(&snd_pcm_link_rwsem);
+ snd_power_unlock(card);
+
+ return result;
+}
+
+/*
+ * drop ioctl
+ *
+ * Immediately put all linked substreams into SETUP state.
+ */
+static int snd_pcm_drop(struct snd_pcm_substream *substream)
+{
+ struct snd_pcm_runtime *runtime;
+ struct snd_card *card;
+ int result = 0;
+
+ if (PCM_RUNTIME_CHECK(substream))
+ return -ENXIO;
+ runtime = substream->runtime;
+ card = substream->pcm->card;
+
+ if (runtime->status->state == SNDRV_PCM_STATE_OPEN ||
+ runtime->status->state == SNDRV_PCM_STATE_DISCONNECTED ||
+ runtime->status->state == SNDRV_PCM_STATE_SUSPENDED)
+ return -EBADFD;
+
+ snd_pcm_stream_lock_irq(substream);
+ /* resume pause */
+ if (runtime->status->state == SNDRV_PCM_STATE_PAUSED)
+ snd_pcm_pause(substream, 0);
+
+ snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
+ /* runtime->control->appl_ptr = runtime->status->hw_ptr; */
+ snd_pcm_stream_unlock_irq(substream);
+
+ return result;
+}
+
+
+/* WARNING: Don't forget to fput back the file */
+static struct file *snd_pcm_file_fd(int fd)
+{
+ struct file *file;
+ struct inode *inode;
+ unsigned int minor;
+
+ file = fget(fd);
+ if (!file)
+ return NULL;
+ inode = file->f_path.dentry->d_inode;
+ if (!S_ISCHR(inode->i_mode) ||
+ imajor(inode) != snd_major) {
+ fput(file);
+ return NULL;
+ }
+ minor = iminor(inode);
+ if (!snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_PLAYBACK) &&
+ !snd_lookup_minor_data(minor, SNDRV_DEVICE_TYPE_PCM_CAPTURE)) {
+ fput(file);
+ return NULL;
+ }
+ return file;
+}
+
+/*
+ * PCM link handling
+ */
+static int snd_pcm_link(struct snd_pcm_substream *substream, int fd)
+{
+ int res = 0;
+ struct file *file;
+ struct snd_pcm_file *pcm_file;
+ struct snd_pcm_substream *substream1;
+
+ file = snd_pcm_file_fd(fd);
+ if (!file)
+ return -EBADFD;
+ pcm_file = file->private_data;
+ substream1 = pcm_file->substream;
+ down_write(&snd_pcm_link_rwsem);
+ write_lock_irq(&snd_pcm_link_rwlock);
+ if (substream->runtime->status->state == SNDRV_PCM_STATE_OPEN ||
+ substream->runtime->status->state != substream1->runtime->status->state) {
+ res = -EBADFD;
+ goto _end;
+ }
+ if (snd_pcm_stream_linked(substream1)) {
+ res = -EALREADY;
+ goto _end;
+ }
+ if (!snd_pcm_stream_linked(substream)) {
+ substream->group = kmalloc(sizeof(struct snd_pcm_group), GFP_ATOMIC);
+ if (substream->group == NULL) {
+ res = -ENOMEM;
+ goto _end;
+ }
+ spin_lock_init(&substream->group->lock);
+ INIT_LIST_HEAD(&substream->group->substreams);
+ list_add_tail(&substream->link_list, &substream->group->substreams);
+ substream->group->count = 1;
+ }
+ list_add_tail(&substream1->link_list, &substream->group->substreams);
+ substream->group->count++;
+ substream1->group = substream->group;
+ _end:
+ write_unlock_irq(&snd_pcm_link_rwlock);
+ up_write(&snd_pcm_link_rwsem);
+ fput(file);
+ return res;
+}
+
+static void relink_to_local(struct snd_pcm_substream *substream)
+{
+ substream->group = &substream->self_group;
+ INIT_LIST_HEAD(&substream->self_group.substreams);
+ list_add_tail(&substream->link_list, &substream->self_group.substreams);
+}
+
+static int snd_pcm_unlink(struct snd_pcm_substream *substream)
+{
+ struct snd_pcm_substream *s;
+ int res = 0;
+
+ down_write(&snd_pcm_link_rwsem);
+ write_lock_irq(&snd_pcm_link_rwlock);
+ if (!snd_pcm_stream_linked(substream)) {
+ res = -EALREADY;
+ goto _end;
+ }
+ list_del(&substream->link_list);
+ substream->group->count--;
+ if (substream->group->count == 1) { /* detach the last stream, too */
+ snd_pcm_group_for_each_entry(s, substream) {
+ relink_to_local(s);
+ break;
+ }
+ kfree(substream->group);
+ }
+ relink_to_local(substream);
+ _end:
+ write_unlock_irq(&snd_pcm_link_rwlock);
+ up_write(&snd_pcm_link_rwsem);
+ return res;
+}
+
+/*
+ * hw configurator
+ */
+static int snd_pcm_hw_rule_mul(struct snd_pcm_hw_params *params,
+ struct snd_pcm_hw_rule *rule)
+{
+ struct snd_interval t;
+ snd_interval_mul(hw_param_interval_c(params, rule->deps[0]),
+ hw_param_interval_c(params, rule->deps[1]), &t);
+ return snd_interval_refine(hw_param_interval(params, rule->var), &t);
+}
+
+static int snd_pcm_hw_rule_div(struct snd_pcm_hw_params *params,
+ struct snd_pcm_hw_rule *rule)
+{
+ struct snd_interval t;
+ snd_interval_div(hw_param_interval_c(params, rule->deps[0]),
+ hw_param_interval_c(params, rule->deps[1]), &t);
+ return snd_interval_refine(hw_param_interval(params, rule->var), &t);
+}
+
+static int snd_pcm_hw_rule_muldivk(struct snd_pcm_hw_params *params,
+ struct snd_pcm_hw_rule *rule)
+{
+ struct snd_interval t;
+ snd_interval_muldivk(hw_param_interval_c(params, rule->deps[0]),
+ hw_param_interval_c(params, rule->deps[1]),
+ (unsigned long) rule->private, &t);
+ return snd_interval_refine(hw_param_interval(params, rule->var), &t);
+}
+
+static int snd_pcm_hw_rule_mulkdiv(struct snd_pcm_hw_params *params,
+ struct snd_pcm_hw_rule *rule)
+{
+ struct snd_interval t;
+ snd_interval_mulkdiv(hw_param_interval_c(params, rule->deps[0]),
+ (unsigned long) rule->private,
+ hw_param_interval_c(params, rule->deps[1]), &t);
+ return snd_interval_refine(hw_param_interval(params, rule->var), &t);
+}
+
+static int snd_pcm_hw_rule_format(struct snd_pcm_hw_params *params,
+ struct snd_pcm_hw_rule *rule)
+{
+ unsigned int k;
+ struct snd_interval *i = hw_param_interval(params, rule->deps[0]);
+ struct snd_mask m;
+ struct snd_mask *mask = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
+ snd_mask_any(&m);
+ for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) {
+ int bits;
+ if (! snd_mask_test(mask, k))
+ continue;
+ bits = snd_pcm_format_physical_width(k);
+ if (bits <= 0)
+ continue; /* ignore invalid formats */
+ if ((unsigned)bits < i->min || (unsigned)bits > i->max)
+ snd_mask_reset(&m, k);
+ }
+ return snd_mask_refine(mask, &m);
+}
+
+static int snd_pcm_hw_rule_sample_bits(struct snd_pcm_hw_params *params,
+ struct snd_pcm_hw_rule *rule)
+{
+ struct snd_interval t;
+ unsigned int k;
+ t.min = UINT_MAX;
+ t.max = 0;
+ t.openmin = 0;
+ t.openmax = 0;
+ for (k = 0; k <= SNDRV_PCM_FORMAT_LAST; ++k) {
+ int bits;
+ if (! snd_mask_test(hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT), k))
+ continue;
+ bits = snd_pcm_format_physical_width(k);
+ if (bits <= 0)
+ continue; /* ignore invalid formats */
+ if (t.min > (unsigned)bits)
+ t.min = bits;
+ if (t.max < (unsigned)bits)
+ t.max = bits;
+ }
+ t.integer = 1;
+ return snd_interval_refine(hw_param_interval(params, rule->var), &t);
+}
+
+#if SNDRV_PCM_RATE_5512 != 1 << 0 || SNDRV_PCM_RATE_192000 != 1 << 12
+#error "Change this table"
+#endif
+
+static unsigned int rates[] = { 5512, 8000, 11025, 16000, 22050, 32000, 44100,
+ 48000, 64000, 88200, 96000, 176400, 192000 };
+
+const struct snd_pcm_hw_constraint_list snd_pcm_known_rates = {
+ .count = ARRAY_SIZE(rates),
+ .list = rates,
+};
+
+static int snd_pcm_hw_rule_rate(struct snd_pcm_hw_params *params,
+ struct snd_pcm_hw_rule *rule)
+{
+ struct snd_pcm_hardware *hw = rule->private;
+ return snd_interval_list(hw_param_interval(params, rule->var),
+ snd_pcm_known_rates.count,
+ snd_pcm_known_rates.list, hw->rates);
+}
+
+static int snd_pcm_hw_rule_buffer_bytes_max(struct snd_pcm_hw_params *params,
+ struct snd_pcm_hw_rule *rule)
+{
+ struct snd_interval t;
+ struct snd_pcm_substream *substream = rule->private;
+ t.min = 0;
+ t.max = substream->buffer_bytes_max;
+ t.openmin = 0;
+ t.openmax = 0;
+ t.integer = 1;
+ return snd_interval_refine(hw_param_interval(params, rule->var), &t);
+}
+
+int snd_pcm_hw_constraints_init(struct snd_pcm_substream *substream)
+{
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
+ int k, err;
+
+ for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) {
+ snd_mask_any(constrs_mask(constrs, k));
+ }
+
+ for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) {
+ snd_interval_any(constrs_interval(constrs, k));
+ }
+
+ snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_CHANNELS));
+ snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_SIZE));
+ snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_BUFFER_BYTES));
+ snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_SAMPLE_BITS));
+ snd_interval_setinteger(constrs_interval(constrs, SNDRV_PCM_HW_PARAM_FRAME_BITS));
+
+ err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FORMAT,
+ snd_pcm_hw_rule_format, NULL,
+ SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
+ if (err < 0)
+ return err;
+ err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
+ snd_pcm_hw_rule_sample_bits, NULL,
+ SNDRV_PCM_HW_PARAM_FORMAT,
+ SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
+ if (err < 0)
+ return err;
+ err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_SAMPLE_BITS,
+ snd_pcm_hw_rule_div, NULL,
+ SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
+ if (err < 0)
+ return err;
+ err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
+ snd_pcm_hw_rule_mul, NULL,
+ SNDRV_PCM_HW_PARAM_SAMPLE_BITS, SNDRV_PCM_HW_PARAM_CHANNELS, -1);
+ if (err < 0)
+ return err;
+ err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
+ snd_pcm_hw_rule_mulkdiv, (void*) 8,
+ SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
+ if (err < 0)
+ return err;
+ err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_FRAME_BITS,
+ snd_pcm_hw_rule_mulkdiv, (void*) 8,
+ SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, -1);
+ if (err < 0)
+ return err;
+ err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_CHANNELS,
+ snd_pcm_hw_rule_div, NULL,
+ SNDRV_PCM_HW_PARAM_FRAME_BITS, SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
+ if (err < 0)
+ return err;
+ err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
+ snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
+ SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_TIME, -1);
+ if (err < 0)
+ return err;
+ err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
+ snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
+ SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_BUFFER_TIME, -1);
+ if (err < 0)
+ return err;
+ err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIODS,
+ snd_pcm_hw_rule_div, NULL,
+ SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIOD_SIZE, -1);
+ if (err < 0)
+ return err;
+ err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
+ snd_pcm_hw_rule_div, NULL,
+ SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
+ if (err < 0)
+ return err;
+ err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
+ snd_pcm_hw_rule_mulkdiv, (void*) 8,
+ SNDRV_PCM_HW_PARAM_PERIOD_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
+ if (err < 0)
+ return err;
+ err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_SIZE,
+ snd_pcm_hw_rule_muldivk, (void*) 1000000,
+ SNDRV_PCM_HW_PARAM_PERIOD_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
+ if (err < 0)
+ return err;
+ err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
+ snd_pcm_hw_rule_mul, NULL,
+ SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_PERIODS, -1);
+ if (err < 0)
+ return err;
+ err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
+ snd_pcm_hw_rule_mulkdiv, (void*) 8,
+ SNDRV_PCM_HW_PARAM_BUFFER_BYTES, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
+ if (err < 0)
+ return err;
+ err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
+ snd_pcm_hw_rule_muldivk, (void*) 1000000,
+ SNDRV_PCM_HW_PARAM_BUFFER_TIME, SNDRV_PCM_HW_PARAM_RATE, -1);
+ if (err < 0)
+ return err;
+ err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
+ snd_pcm_hw_rule_muldivk, (void*) 8,
+ SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
+ if (err < 0)
+ return err;
+ err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
+ snd_pcm_hw_rule_muldivk, (void*) 8,
+ SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_FRAME_BITS, -1);
+ if (err < 0)
+ return err;
+ err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_PERIOD_TIME,
+ snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
+ SNDRV_PCM_HW_PARAM_PERIOD_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
+ if (err < 0)
+ return err;
+ err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_TIME,
+ snd_pcm_hw_rule_mulkdiv, (void*) 1000000,
+ SNDRV_PCM_HW_PARAM_BUFFER_SIZE, SNDRV_PCM_HW_PARAM_RATE, -1);
+ if (err < 0)
+ return err;
+ return 0;
+}
+
+int snd_pcm_hw_constraints_complete(struct snd_pcm_substream *substream)
+{
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ struct snd_pcm_hardware *hw = &runtime->hw;
+ int err;
+ unsigned int mask = 0;
+
+ if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
+ mask |= 1 << SNDRV_PCM_ACCESS_RW_INTERLEAVED;
+ if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
+ mask |= 1 << SNDRV_PCM_ACCESS_RW_NONINTERLEAVED;
+ if (hw->info & SNDRV_PCM_INFO_MMAP) {
+ if (hw->info & SNDRV_PCM_INFO_INTERLEAVED)
+ mask |= 1 << SNDRV_PCM_ACCESS_MMAP_INTERLEAVED;
+ if (hw->info & SNDRV_PCM_INFO_NONINTERLEAVED)
+ mask |= 1 << SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED;
+ if (hw->info & SNDRV_PCM_INFO_COMPLEX)
+ mask |= 1 << SNDRV_PCM_ACCESS_MMAP_COMPLEX;
+ }
+ err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_ACCESS, mask);
+ if (err < 0)
+ return err;
+
+ err = snd_pcm_hw_constraint_mask64(runtime, SNDRV_PCM_HW_PARAM_FORMAT, hw->formats);
+ if (err < 0)
+ return err;
+
+ err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_SUBFORMAT, 1 << SNDRV_PCM_SUBFORMAT_STD);
+ if (err < 0)
+ return err;
+
+ err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_CHANNELS,
+ hw->channels_min, hw->channels_max);
+ if (err < 0)
+ return err;
+
+ err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_RATE,
+ hw->rate_min, hw->rate_max);
+ if (err < 0)
+ return err;
+
+ err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIOD_BYTES,
+ hw->period_bytes_min, hw->period_bytes_max);
+ if (err < 0)
+ return err;
+
+ err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_PERIODS,
+ hw->periods_min, hw->periods_max);
+ if (err < 0)
+ return err;
+
+ err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
+ hw->period_bytes_min, hw->buffer_bytes_max);
+ if (err < 0)
+ return err;
+
+ err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_BUFFER_BYTES,
+ snd_pcm_hw_rule_buffer_bytes_max, substream,
+ SNDRV_PCM_HW_PARAM_BUFFER_BYTES, -1);
+ if (err < 0)
+ return err;
+
+ /* FIXME: remove */
+ if (runtime->dma_bytes) {
+ err = snd_pcm_hw_constraint_minmax(runtime, SNDRV_PCM_HW_PARAM_BUFFER_BYTES, 0, runtime->dma_bytes);
+ if (err < 0)
+ return -EINVAL;
+ }
+
+ if (!(hw->rates & (SNDRV_PCM_RATE_KNOT | SNDRV_PCM_RATE_CONTINUOUS))) {
+ err = snd_pcm_hw_rule_add(runtime, 0, SNDRV_PCM_HW_PARAM_RATE,
+ snd_pcm_hw_rule_rate, hw,
+ SNDRV_PCM_HW_PARAM_RATE, -1);
+ if (err < 0)
+ return err;
+ }
+
+ /* FIXME: this belong to lowlevel */
+ snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIOD_SIZE);
+
+ return 0;
+}
+
+static void pcm_release_private(struct snd_pcm_substream *substream)
+{
+ snd_pcm_unlink(substream);
+}
+
+void snd_pcm_release_substream(struct snd_pcm_substream *substream)
+{
+ substream->ref_count--;
+ if (substream->ref_count > 0)
+ return;
+
+ snd_pcm_drop(substream);
+ if (substream->hw_opened) {
+ if (substream->ops->hw_free != NULL)
+ substream->ops->hw_free(substream);
+ substream->ops->close(substream);
+ substream->hw_opened = 0;
+ }
+ if (substream->pcm_release) {
+ substream->pcm_release(substream);
+ substream->pcm_release = NULL;
+ }
+ snd_pcm_detach_substream(substream);
+}
+
+EXPORT_SYMBOL(snd_pcm_release_substream);
+
+int snd_pcm_open_substream(struct snd_pcm *pcm, int stream,
+ struct file *file,
+ struct snd_pcm_substream **rsubstream)
+{
+ struct snd_pcm_substream *substream;
+ int err;
+
+ err = snd_pcm_attach_substream(pcm, stream, file, &substream);
+ if (err < 0)
+ return err;
+ if (substream->ref_count > 1) {
+ *rsubstream = substream;
+ return 0;
+ }
+
+ err = snd_pcm_hw_constraints_init(substream);
+ if (err < 0) {
+ snd_printd("snd_pcm_hw_constraints_init failed\n");
+ goto error;
+ }
+
+ if ((err = substream->ops->open(substream)) < 0)
+ goto error;
+
+ substream->hw_opened = 1;
+
+ err = snd_pcm_hw_constraints_complete(substream);
+ if (err < 0) {
+ snd_printd("snd_pcm_hw_constraints_complete failed\n");
+ goto error;
+ }
+
+ *rsubstream = substream;
+ return 0;
+
+ error:
+ snd_pcm_release_substream(substream);
+ return err;
+}
+
+EXPORT_SYMBOL(snd_pcm_open_substream);
+
+static int snd_pcm_open_file(struct file *file,
+ struct snd_pcm *pcm,
+ int stream,
+ struct snd_pcm_file **rpcm_file)
+{
+ struct snd_pcm_file *pcm_file;
+ struct snd_pcm_substream *substream;
+ struct snd_pcm_str *str;
+ int err;
+
+ if (rpcm_file)
+ *rpcm_file = NULL;
+
+ err = snd_pcm_open_substream(pcm, stream, file, &substream);
+ if (err < 0)
+ return err;
+
+ pcm_file = kzalloc(sizeof(*pcm_file), GFP_KERNEL);
+ if (pcm_file == NULL) {
+ snd_pcm_release_substream(substream);
+ return -ENOMEM;
+ }
+ pcm_file->substream = substream;
+ if (substream->ref_count == 1) {
+ str = substream->pstr;
+ substream->file = pcm_file;
+ substream->pcm_release = pcm_release_private;
+ }
+ file->private_data = pcm_file;
+ if (rpcm_file)
+ *rpcm_file = pcm_file;
+ return 0;
+}
+
+static int snd_pcm_playback_open(struct inode *inode, struct file *file)
+{
+ struct snd_pcm *pcm;
+ int err = nonseekable_open(inode, file);
+ if (err < 0)
+ return err;
+ pcm = snd_lookup_minor_data(iminor(inode),
+ SNDRV_DEVICE_TYPE_PCM_PLAYBACK);
+ return snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_PLAYBACK);
+}
+
+static int snd_pcm_capture_open(struct inode *inode, struct file *file)
+{
+ struct snd_pcm *pcm;
+ int err = nonseekable_open(inode, file);
+ if (err < 0)
+ return err;
+ pcm = snd_lookup_minor_data(iminor(inode),
+ SNDRV_DEVICE_TYPE_PCM_CAPTURE);
+ return snd_pcm_open(file, pcm, SNDRV_PCM_STREAM_CAPTURE);
+}
+
+static int snd_pcm_open(struct file *file, struct snd_pcm *pcm, int stream)
+{
+ int err;
+ struct snd_pcm_file *pcm_file;
+ wait_queue_t wait;
+
+ if (pcm == NULL) {
+ err = -ENODEV;
+ goto __error1;
+ }
+ err = snd_card_file_add(pcm->card, file);
+ if (err < 0)
+ goto __error1;
+ if (!try_module_get(pcm->card->module)) {
+ err = -EFAULT;
+ goto __error2;
+ }
+ init_waitqueue_entry(&wait, current);
+ add_wait_queue(&pcm->open_wait, &wait);
+ mutex_lock(&pcm->open_mutex);
+ while (1) {
+ err = snd_pcm_open_file(file, pcm, stream, &pcm_file);
+ if (err >= 0)
+ break;
+ if (err == -EAGAIN) {
+ if (file->f_flags & O_NONBLOCK) {
+ err = -EBUSY;
+ break;
+ }
+ } else
+ break;
+ set_current_state(TASK_INTERRUPTIBLE);
+ mutex_unlock(&pcm->open_mutex);
+ schedule();
+ mutex_lock(&pcm->open_mutex);
+ if (signal_pending(current)) {
+ err = -ERESTARTSYS;
+ break;
+ }
+ }
+ remove_wait_queue(&pcm->open_wait, &wait);
+ mutex_unlock(&pcm->open_mutex);
+ if (err < 0)
+ goto __error;
+ return err;
+
+ __error:
+ module_put(pcm->card->module);
+ __error2:
+ snd_card_file_remove(pcm->card, file);
+ __error1:
+ return err;
+}
+
+static int snd_pcm_release(struct inode *inode, struct file *file)
+{
+ struct snd_pcm *pcm;
+ struct snd_pcm_substream *substream;
+ struct snd_pcm_file *pcm_file;
+
+ pcm_file = file->private_data;
+ substream = pcm_file->substream;
+ if (snd_BUG_ON(!substream))
+ return -ENXIO;
+ pcm = substream->pcm;
+ mutex_lock(&pcm->open_mutex);
+ snd_pcm_release_substream(substream);
+ kfree(pcm_file);
+ mutex_unlock(&pcm->open_mutex);
+ wake_up(&pcm->open_wait);
+ module_put(pcm->card->module);
+ snd_card_file_remove(pcm->card, file);
+ return 0;
+}
+
+static snd_pcm_sframes_t snd_pcm_playback_rewind(struct snd_pcm_substream *substream,
+ snd_pcm_uframes_t frames)
+{
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ snd_pcm_sframes_t appl_ptr;
+ snd_pcm_sframes_t ret;
+ snd_pcm_sframes_t hw_avail;
+
+ if (frames == 0)
+ return 0;
+
+ snd_pcm_stream_lock_irq(substream);
+ switch (runtime->status->state) {
+ case SNDRV_PCM_STATE_PREPARED:
+ break;
+ case SNDRV_PCM_STATE_DRAINING:
+ case SNDRV_PCM_STATE_RUNNING:
+ if (snd_pcm_update_hw_ptr(substream) >= 0)
+ break;
+ /* Fall through */
+ case SNDRV_PCM_STATE_XRUN:
+ ret = -EPIPE;
+ goto __end;
+ case SNDRV_PCM_STATE_SUSPENDED:
+ ret = -ESTRPIPE;
+ goto __end;
+ default:
+ ret = -EBADFD;
+ goto __end;
+ }
+
+ hw_avail = snd_pcm_playback_hw_avail(runtime);
+ if (hw_avail <= 0) {
+ ret = 0;
+ goto __end;
+ }
+ if (frames > (snd_pcm_uframes_t)hw_avail)
+ frames = hw_avail;
+ appl_ptr = runtime->control->appl_ptr - frames;
+ if (appl_ptr < 0)
+ appl_ptr += runtime->boundary;
+ runtime->control->appl_ptr = appl_ptr;
+ ret = frames;
+ __end:
+ snd_pcm_stream_unlock_irq(substream);
+ return ret;
+}
+
+static snd_pcm_sframes_t snd_pcm_capture_rewind(struct snd_pcm_substream *substream,
+ snd_pcm_uframes_t frames)
+{
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ snd_pcm_sframes_t appl_ptr;
+ snd_pcm_sframes_t ret;
+ snd_pcm_sframes_t hw_avail;
+
+ if (frames == 0)
+ return 0;
+
+ snd_pcm_stream_lock_irq(substream);
+ switch (runtime->status->state) {
+ case SNDRV_PCM_STATE_PREPARED:
+ case SNDRV_PCM_STATE_DRAINING:
+ break;
+ case SNDRV_PCM_STATE_RUNNING:
+ if (snd_pcm_update_hw_ptr(substream) >= 0)
+ break;
+ /* Fall through */
+ case SNDRV_PCM_STATE_XRUN:
+ ret = -EPIPE;
+ goto __end;
+ case SNDRV_PCM_STATE_SUSPENDED:
+ ret = -ESTRPIPE;
+ goto __end;
+ default:
+ ret = -EBADFD;
+ goto __end;
+ }
+
+ hw_avail = snd_pcm_capture_hw_avail(runtime);
+ if (hw_avail <= 0) {
+ ret = 0;
+ goto __end;
+ }
+ if (frames > (snd_pcm_uframes_t)hw_avail)
+ frames = hw_avail;
+ appl_ptr = runtime->control->appl_ptr - frames;
+ if (appl_ptr < 0)
+ appl_ptr += runtime->boundary;
+ runtime->control->appl_ptr = appl_ptr;
+ ret = frames;
+ __end:
+ snd_pcm_stream_unlock_irq(substream);
+ return ret;
+}
+
+static snd_pcm_sframes_t snd_pcm_playback_forward(struct snd_pcm_substream *substream,
+ snd_pcm_uframes_t frames)
+{
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ snd_pcm_sframes_t appl_ptr;
+ snd_pcm_sframes_t ret;
+ snd_pcm_sframes_t avail;
+
+ if (frames == 0)
+ return 0;
+
+ snd_pcm_stream_lock_irq(substream);
+ switch (runtime->status->state) {
+ case SNDRV_PCM_STATE_PREPARED:
+ case SNDRV_PCM_STATE_PAUSED:
+ break;
+ case SNDRV_PCM_STATE_DRAINING:
+ case SNDRV_PCM_STATE_RUNNING:
+ if (snd_pcm_update_hw_ptr(substream) >= 0)
+ break;
+ /* Fall through */
+ case SNDRV_PCM_STATE_XRUN:
+ ret = -EPIPE;
+ goto __end;
+ case SNDRV_PCM_STATE_SUSPENDED:
+ ret = -ESTRPIPE;
+ goto __end;
+ default:
+ ret = -EBADFD;
+ goto __end;
+ }
+
+ avail = snd_pcm_playback_avail(runtime);
+ if (avail <= 0) {
+ ret = 0;
+ goto __end;
+ }
+ if (frames > (snd_pcm_uframes_t)avail)
+ frames = avail;
+ appl_ptr = runtime->control->appl_ptr + frames;
+ if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary)
+ appl_ptr -= runtime->boundary;
+ runtime->control->appl_ptr = appl_ptr;
+ ret = frames;
+ __end:
+ snd_pcm_stream_unlock_irq(substream);
+ return ret;
+}
+
+static snd_pcm_sframes_t snd_pcm_capture_forward(struct snd_pcm_substream *substream,
+ snd_pcm_uframes_t frames)
+{
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ snd_pcm_sframes_t appl_ptr;
+ snd_pcm_sframes_t ret;
+ snd_pcm_sframes_t avail;
+
+ if (frames == 0)
+ return 0;
+
+ snd_pcm_stream_lock_irq(substream);
+ switch (runtime->status->state) {
+ case SNDRV_PCM_STATE_PREPARED:
+ case SNDRV_PCM_STATE_DRAINING:
+ case SNDRV_PCM_STATE_PAUSED:
+ break;
+ case SNDRV_PCM_STATE_RUNNING:
+ if (snd_pcm_update_hw_ptr(substream) >= 0)
+ break;
+ /* Fall through */
+ case SNDRV_PCM_STATE_XRUN:
+ ret = -EPIPE;
+ goto __end;
+ case SNDRV_PCM_STATE_SUSPENDED:
+ ret = -ESTRPIPE;
+ goto __end;
+ default:
+ ret = -EBADFD;
+ goto __end;
+ }
+
+ avail = snd_pcm_capture_avail(runtime);
+ if (avail <= 0) {
+ ret = 0;
+ goto __end;
+ }
+ if (frames > (snd_pcm_uframes_t)avail)
+ frames = avail;
+ appl_ptr = runtime->control->appl_ptr + frames;
+ if (appl_ptr >= (snd_pcm_sframes_t)runtime->boundary)
+ appl_ptr -= runtime->boundary;
+ runtime->control->appl_ptr = appl_ptr;
+ ret = frames;
+ __end:
+ snd_pcm_stream_unlock_irq(substream);
+ return ret;
+}
+
+static int snd_pcm_hwsync(struct snd_pcm_substream *substream)
+{
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ int err;
+
+ snd_pcm_stream_lock_irq(substream);
+ switch (runtime->status->state) {
+ case SNDRV_PCM_STATE_DRAINING:
+ if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
+ goto __badfd;
+ case SNDRV_PCM_STATE_RUNNING:
+ if ((err = snd_pcm_update_hw_ptr(substream)) < 0)
+ break;
+ /* Fall through */
+ case SNDRV_PCM_STATE_PREPARED:
+ case SNDRV_PCM_STATE_SUSPENDED:
+ err = 0;
+ break;
+ case SNDRV_PCM_STATE_XRUN:
+ err = -EPIPE;
+ break;
+ default:
+ __badfd:
+ err = -EBADFD;
+ break;
+ }
+ snd_pcm_stream_unlock_irq(substream);
+ return err;
+}
+
+static int snd_pcm_delay(struct snd_pcm_substream *substream,
+ snd_pcm_sframes_t __user *res)
+{
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ int err;
+ snd_pcm_sframes_t n = 0;
+
+ //giovanni snd_pcm_stream_lock_irq(substream);
+ switch (runtime->status->state) {
+ case SNDRV_PCM_STATE_DRAINING:
+ if (substream->stream == SNDRV_PCM_STREAM_CAPTURE)
+ goto __badfd;
+ case SNDRV_PCM_STATE_RUNNING:
+ if ((err = snd_pcm_update_hw_ptr(substream)) < 0)
+ break;
+ /* Fall through */
+ case SNDRV_PCM_STATE_PREPARED:
+ case SNDRV_PCM_STATE_SUSPENDED:
+ err = 0;
+ if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
+ n = snd_pcm_playback_hw_avail(runtime);
+ else
+ n = snd_pcm_capture_avail(runtime);
+ n += runtime->delay;
+ break;
+ case SNDRV_PCM_STATE_XRUN:
+ err = -EPIPE;
+ break;
+ default:
+ __badfd:
+ err = -EBADFD;
+ break;
+ }
+ //giovanni snd_pcm_stream_unlock_irq(substream);
+ if (!err)
+ if (put_user(n, res))
+ err = -EFAULT;
+ return err;
+}
+
+static int snd_pcm_sync_ptr(struct snd_pcm_substream *substream,
+ struct snd_pcm_sync_ptr __user *_sync_ptr)
+{
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ struct snd_pcm_sync_ptr sync_ptr;
+ volatile struct snd_pcm_mmap_status *status;
+ volatile struct snd_pcm_mmap_control *control;
+ int err;
+
+ memset(&sync_ptr, 0, sizeof(sync_ptr));
+ if (get_user(sync_ptr.flags, (unsigned __user *)&(_sync_ptr->flags)))
+ return -EFAULT;
+ if (copy_from_user(&sync_ptr.c.control, &(_sync_ptr->c.control), sizeof(struct snd_pcm_mmap_control)))
+ return -EFAULT;
+ status = runtime->status;
+ control = runtime->control;
+ if (sync_ptr.flags & SNDRV_PCM_SYNC_PTR_HWSYNC) {
+ err = snd_pcm_hwsync(substream);
+ if (err < 0)
+ return err;
+ }
+ //giovanni snd_pcm_stream_lock_irq(substream);
+ if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_APPL))
+ control->appl_ptr = sync_ptr.c.control.appl_ptr;
+ else
+ sync_ptr.c.control.appl_ptr = control->appl_ptr;
+ if (!(sync_ptr.flags & SNDRV_PCM_SYNC_PTR_AVAIL_MIN))
+ control->avail_min = sync_ptr.c.control.avail_min;
+ else
+ sync_ptr.c.control.avail_min = control->avail_min;
+ sync_ptr.s.status.state = status->state;
+ sync_ptr.s.status.hw_ptr = status->hw_ptr;
+ sync_ptr.s.status.tstamp = status->tstamp;
+ sync_ptr.s.status.suspended_state = status->suspended_state;
+ //giovanni snd_pcm_stream_unlock_irq(substream);
+ if (copy_to_user(_sync_ptr, &sync_ptr, sizeof(sync_ptr)))
+ return -EFAULT;
+ return 0;
+}
+
+static int snd_pcm_tstamp(struct snd_pcm_substream *substream, int __user *_arg)
+{
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ int arg;
+
+ if (get_user(arg, _arg))
+ return -EFAULT;
+ if (arg < 0 || arg > SNDRV_PCM_TSTAMP_TYPE_LAST)
+ return -EINVAL;
+ runtime->tstamp_type = SNDRV_PCM_TSTAMP_TYPE_GETTIMEOFDAY;
+ if (arg == SNDRV_PCM_TSTAMP_TYPE_MONOTONIC)
+ runtime->tstamp_type = SNDRV_PCM_TSTAMP_TYPE_MONOTONIC;
+ return 0;
+}
+
+static int snd_pcm_common_ioctl1(struct file *file,
+ struct snd_pcm_substream *substream,
+ unsigned int cmd, void __user *arg)
+{
+ switch (cmd) {
+ case SNDRV_PCM_IOCTL_PVERSION:
+ return put_user(SNDRV_PCM_VERSION, (int __user *)arg) ? -EFAULT : 0;
+ case SNDRV_PCM_IOCTL_INFO:
+ return snd_pcm_info_user(substream, arg);
+ case SNDRV_PCM_IOCTL_TSTAMP: /* just for compatibility */
+ return 0;
+ case SNDRV_PCM_IOCTL_TTSTAMP:
+ return snd_pcm_tstamp(substream, arg);
+ case SNDRV_PCM_IOCTL_HW_REFINE:
+ return snd_pcm_hw_refine_user(substream, arg);
+ case SNDRV_PCM_IOCTL_HW_PARAMS:
+ return snd_pcm_hw_params_user(substream, arg);
+ case SNDRV_PCM_IOCTL_HW_FREE:
+ return snd_pcm_hw_free(substream);
+ case SNDRV_PCM_IOCTL_SW_PARAMS:
+ return snd_pcm_sw_params_user(substream, arg);
+ case SNDRV_PCM_IOCTL_STATUS:
+ return snd_pcm_status_user(substream, arg);
+ case SNDRV_PCM_IOCTL_CHANNEL_INFO:
+ return snd_pcm_channel_info_user(substream, arg);
+ case SNDRV_PCM_IOCTL_PREPARE:
+ return snd_pcm_prepare(substream, file);
+ case SNDRV_PCM_IOCTL_RESET:
+ return snd_pcm_reset(substream);
+ case SNDRV_PCM_IOCTL_START:
+ return snd_pcm_action_lock_irq(&snd_pcm_action_start, substream, SNDRV_PCM_STATE_RUNNING);
+ case SNDRV_PCM_IOCTL_LINK:
+ return snd_pcm_link(substream, (int)(unsigned long) arg);
+ case SNDRV_PCM_IOCTL_UNLINK:
+ return snd_pcm_unlink(substream);
+ case SNDRV_PCM_IOCTL_RESUME:
+ return snd_pcm_resume(substream);
+ case SNDRV_PCM_IOCTL_XRUN:
+ return snd_pcm_xrun(substream);
+ case SNDRV_PCM_IOCTL_HWSYNC:
+ return snd_pcm_hwsync(substream);
+ case SNDRV_PCM_IOCTL_DELAY:
+ return snd_pcm_delay(substream, arg);
+ case SNDRV_PCM_IOCTL_SYNC_PTR:
+ return snd_pcm_sync_ptr(substream, arg);
+#ifdef CONFIG_SND_SUPPORT_OLD_API
+ case SNDRV_PCM_IOCTL_HW_REFINE_OLD:
+ return snd_pcm_hw_refine_old_user(substream, arg);
+ case SNDRV_PCM_IOCTL_HW_PARAMS_OLD:
+ return snd_pcm_hw_params_old_user(substream, arg);
+#endif
+ case SNDRV_PCM_IOCTL_DRAIN:
+ return snd_pcm_drain(substream, file);
+ case SNDRV_PCM_IOCTL_DROP:
+ return snd_pcm_drop(substream);
+ case SNDRV_PCM_IOCTL_PAUSE:
+ {
+ int res;
+ snd_pcm_stream_lock_irq(substream);
+ res = snd_pcm_pause(substream, (int)(unsigned long)arg);
+ snd_pcm_stream_unlock_irq(substream);
+ return res;
+ }
+ }
+ snd_printd("unknown ioctl = 0x%x\n", cmd);
+ return -ENOTTY;
+}
+
+static int snd_pcm_playback_ioctl1(struct file *file,
+ struct snd_pcm_substream *substream,
+ unsigned int cmd, void __user *arg)
+{
+ if (snd_BUG_ON(!substream))
+ return -ENXIO;
+ if (snd_BUG_ON(substream->stream != SNDRV_PCM_STREAM_PLAYBACK))
+ return -EINVAL;
+ switch (cmd) {
+ case SNDRV_PCM_IOCTL_WRITEI_FRAMES:
+ {
+ struct snd_xferi xferi;
+ struct snd_xferi __user *_xferi = arg;
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ snd_pcm_sframes_t result;
+ if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
+ return -EBADFD;
+ if (put_user(0, &_xferi->result))
+ return -EFAULT;
+ if (copy_from_user(&xferi, _xferi, sizeof(xferi)))
+ return -EFAULT;
+ result = snd_pcm_lib_write(substream, xferi.buf, xferi.frames);
+ __put_user(result, &_xferi->result);
+ return result < 0 ? result : 0;
+ }
+ case SNDRV_PCM_IOCTL_WRITEN_FRAMES:
+ {
+ struct snd_xfern xfern;
+ struct snd_xfern __user *_xfern = arg;
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ void __user **bufs;
+ snd_pcm_sframes_t result;
+ if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
+ return -EBADFD;
+ if (runtime->channels > 128)
+ return -EINVAL;
+ if (put_user(0, &_xfern->result))
+ return -EFAULT;
+ if (copy_from_user(&xfern, _xfern, sizeof(xfern)))
+ return -EFAULT;
+
+ bufs = memdup_user(xfern.bufs,
+ sizeof(void *) * runtime->channels);
+ if (IS_ERR(bufs))
+ return PTR_ERR(bufs);
+ result = snd_pcm_lib_writev(substream, bufs, xfern.frames);
+ kfree(bufs);
+ __put_user(result, &_xfern->result);
+ return result < 0 ? result : 0;
+ }
+ case SNDRV_PCM_IOCTL_REWIND:
+ {
+ snd_pcm_uframes_t frames;
+ snd_pcm_uframes_t __user *_frames = arg;
+ snd_pcm_sframes_t result;
+ if (get_user(frames, _frames))
+ return -EFAULT;
+ if (put_user(0, _frames))
+ return -EFAULT;
+ result = snd_pcm_playback_rewind(substream, frames);
+ __put_user(result, _frames);
+ return result < 0 ? result : 0;
+ }
+ case SNDRV_PCM_IOCTL_FORWARD:
+ {
+ snd_pcm_uframes_t frames;
+ snd_pcm_uframes_t __user *_frames = arg;
+ snd_pcm_sframes_t result;
+ if (get_user(frames, _frames))
+ return -EFAULT;
+ if (put_user(0, _frames))
+ return -EFAULT;
+ result = snd_pcm_playback_forward(substream, frames);
+ __put_user(result, _frames);
+ return result < 0 ? result : 0;
+ }
+ }
+ return snd_pcm_common_ioctl1(file, substream, cmd, arg);
+}
+
+static int snd_pcm_capture_ioctl1(struct file *file,
+ struct snd_pcm_substream *substream,
+ unsigned int cmd, void __user *arg)
+{
+ if (snd_BUG_ON(!substream))
+ return -ENXIO;
+ if (snd_BUG_ON(substream->stream != SNDRV_PCM_STREAM_CAPTURE))
+ return -EINVAL;
+ switch (cmd) {
+ case SNDRV_PCM_IOCTL_READI_FRAMES:
+ {
+ struct snd_xferi xferi;
+ struct snd_xferi __user *_xferi = arg;
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ snd_pcm_sframes_t result;
+ if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
+ return -EBADFD;
+ if (put_user(0, &_xferi->result))
+ return -EFAULT;
+ if (copy_from_user(&xferi, _xferi, sizeof(xferi)))
+ return -EFAULT;
+ result = snd_pcm_lib_read(substream, xferi.buf, xferi.frames);
+ __put_user(result, &_xferi->result);
+ return result < 0 ? result : 0;
+ }
+ case SNDRV_PCM_IOCTL_READN_FRAMES:
+ {
+ struct snd_xfern xfern;
+ struct snd_xfern __user *_xfern = arg;
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ void *bufs;
+ snd_pcm_sframes_t result;
+ if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
+ return -EBADFD;
+ if (runtime->channels > 128)
+ return -EINVAL;
+ if (put_user(0, &_xfern->result))
+ return -EFAULT;
+ if (copy_from_user(&xfern, _xfern, sizeof(xfern)))
+ return -EFAULT;
+
+ bufs = memdup_user(xfern.bufs,
+ sizeof(void *) * runtime->channels);
+ if (IS_ERR(bufs))
+ return PTR_ERR(bufs);
+ result = snd_pcm_lib_readv(substream, bufs, xfern.frames);
+ kfree(bufs);
+ __put_user(result, &_xfern->result);
+ return result < 0 ? result : 0;
+ }
+ case SNDRV_PCM_IOCTL_REWIND:
+ {
+ snd_pcm_uframes_t frames;
+ snd_pcm_uframes_t __user *_frames = arg;
+ snd_pcm_sframes_t result;
+ if (get_user(frames, _frames))
+ return -EFAULT;
+ if (put_user(0, _frames))
+ return -EFAULT;
+ result = snd_pcm_capture_rewind(substream, frames);
+ __put_user(result, _frames);
+ return result < 0 ? result : 0;
+ }
+ case SNDRV_PCM_IOCTL_FORWARD:
+ {
+ snd_pcm_uframes_t frames;
+ snd_pcm_uframes_t __user *_frames = arg;
+ snd_pcm_sframes_t result;
+ if (get_user(frames, _frames))
+ return -EFAULT;
+ if (put_user(0, _frames))
+ return -EFAULT;
+ result = snd_pcm_capture_forward(substream, frames);
+ __put_user(result, _frames);
+ return result < 0 ? result : 0;
+ }
+ }
+ return snd_pcm_common_ioctl1(file, substream, cmd, arg);
+}
+
+static long snd_pcm_playback_ioctl(struct file *file, unsigned int cmd,
+ unsigned long arg)
+{
+ struct snd_pcm_file *pcm_file;
+
+ pcm_file = file->private_data;
+
+ if (((cmd >> 8) & 0xff) != 'A')
+ return -ENOTTY;
+
+ return snd_pcm_playback_ioctl1(file, pcm_file->substream, cmd,
+ (void __user *)arg);
+}
+
+static long snd_pcm_capture_ioctl(struct file *file, unsigned int cmd,
+ unsigned long arg)
+{
+ struct snd_pcm_file *pcm_file;
+
+ pcm_file = file->private_data;
+
+ if (((cmd >> 8) & 0xff) != 'A')
+ return -ENOTTY;
+
+ return snd_pcm_capture_ioctl1(file, pcm_file->substream, cmd,
+ (void __user *)arg);
+}
+
+int snd_pcm_kernel_ioctl(struct snd_pcm_substream *substream,
+ unsigned int cmd, void *arg)
+{
+ mm_segment_t fs;
+ int result;
+
+ fs = snd_enter_user();
+ switch (substream->stream) {
+ case SNDRV_PCM_STREAM_PLAYBACK:
+ result = snd_pcm_playback_ioctl1(NULL, substream, cmd,
+ (void __user *)arg);
+ break;
+ case SNDRV_PCM_STREAM_CAPTURE:
+ result = snd_pcm_capture_ioctl1(NULL, substream, cmd,
+ (void __user *)arg);
+ break;
+ default:
+ result = -EINVAL;
+ break;
+ }
+ snd_leave_user(fs);
+ return result;
+}
+
+EXPORT_SYMBOL(snd_pcm_kernel_ioctl);
+
+static ssize_t snd_pcm_read(struct file *file, char __user *buf, size_t count,
+ loff_t * offset)
+{
+ struct snd_pcm_file *pcm_file;
+ struct snd_pcm_substream *substream;
+ struct snd_pcm_runtime *runtime;
+ snd_pcm_sframes_t result;
+
+ pcm_file = file->private_data;
+ substream = pcm_file->substream;
+ if (PCM_RUNTIME_CHECK(substream))
+ return -ENXIO;
+ runtime = substream->runtime;
+ if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
+ return -EBADFD;
+ if (!frame_aligned(runtime, count))
+ return -EINVAL;
+ count = bytes_to_frames(runtime, count);
+ result = snd_pcm_lib_read(substream, buf, count);
+ if (result > 0)
+ result = frames_to_bytes(runtime, result);
+ return result;
+}
+
+static ssize_t snd_pcm_write(struct file *file, const char __user *buf,
+ size_t count, loff_t * offset)
+{
+ struct snd_pcm_file *pcm_file;
+ struct snd_pcm_substream *substream;
+ struct snd_pcm_runtime *runtime;
+ snd_pcm_sframes_t result;
+
+ pcm_file = file->private_data;
+ substream = pcm_file->substream;
+ if (PCM_RUNTIME_CHECK(substream))
+ return -ENXIO;
+ runtime = substream->runtime;
+ if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
+ return -EBADFD;
+ if (!frame_aligned(runtime, count))
+ return -EINVAL;
+ count = bytes_to_frames(runtime, count);
+ result = snd_pcm_lib_write(substream, buf, count);
+ if (result > 0)
+ result = frames_to_bytes(runtime, result);
+ return result;
+}
+
+static ssize_t snd_pcm_aio_read(struct kiocb *iocb, const struct iovec *iov,
+ unsigned long nr_segs, loff_t pos)
+
+{
+ struct snd_pcm_file *pcm_file;
+ struct snd_pcm_substream *substream;
+ struct snd_pcm_runtime *runtime;
+ snd_pcm_sframes_t result;
+ unsigned long i;
+ void __user **bufs;
+ snd_pcm_uframes_t frames;
+
+ pcm_file = iocb->ki_filp->private_data;
+ substream = pcm_file->substream;
+ if (PCM_RUNTIME_CHECK(substream))
+ return -ENXIO;
+ runtime = substream->runtime;
+ if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
+ return -EBADFD;
+ if (nr_segs > 1024 || nr_segs != runtime->channels)
+ return -EINVAL;
+ if (!frame_aligned(runtime, iov->iov_len))
+ return -EINVAL;
+ frames = bytes_to_samples(runtime, iov->iov_len);
+ bufs = kmalloc(sizeof(void *) * nr_segs, GFP_KERNEL);
+ if (bufs == NULL)
+ return -ENOMEM;
+ for (i = 0; i < nr_segs; ++i)
+ bufs[i] = iov[i].iov_base;
+ result = snd_pcm_lib_readv(substream, bufs, frames);
+ if (result > 0)
+ result = frames_to_bytes(runtime, result);
+ kfree(bufs);
+ return result;
+}
+
+static ssize_t snd_pcm_aio_write(struct kiocb *iocb, const struct iovec *iov,
+ unsigned long nr_segs, loff_t pos)
+{
+ struct snd_pcm_file *pcm_file;
+ struct snd_pcm_substream *substream;
+ struct snd_pcm_runtime *runtime;
+ snd_pcm_sframes_t result;
+ unsigned long i;
+ void __user **bufs;
+ snd_pcm_uframes_t frames;
+
+ pcm_file = iocb->ki_filp->private_data;
+ substream = pcm_file->substream;
+ if (PCM_RUNTIME_CHECK(substream))
+ return -ENXIO;
+ runtime = substream->runtime;
+ if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
+ return -EBADFD;
+ if (nr_segs > 128 || nr_segs != runtime->channels ||
+ !frame_aligned(runtime, iov->iov_len))
+ return -EINVAL;
+ frames = bytes_to_samples(runtime, iov->iov_len);
+ bufs = kmalloc(sizeof(void *) * nr_segs, GFP_KERNEL);
+ if (bufs == NULL)
+ return -ENOMEM;
+ for (i = 0; i < nr_segs; ++i)
+ bufs[i] = iov[i].iov_base;
+ result = snd_pcm_lib_writev(substream, bufs, frames);
+ if (result > 0)
+ result = frames_to_bytes(runtime, result);
+ kfree(bufs);
+ return result;
+}
+
+static unsigned int snd_pcm_playback_poll(struct file *file, poll_table * wait)
+{
+ struct snd_pcm_file *pcm_file;
+ struct snd_pcm_substream *substream;
+ struct snd_pcm_runtime *runtime;
+ unsigned int mask;
+ snd_pcm_uframes_t avail;
+
+ pcm_file = file->private_data;
+
+ substream = pcm_file->substream;
+ if (PCM_RUNTIME_CHECK(substream))
+ return -ENXIO;
+ runtime = substream->runtime;
+
+ poll_wait(file, &runtime->sleep, wait);
+
+ //giovanni snd_pcm_stream_lock_irq(substream);
+ avail = snd_pcm_playback_avail(runtime);
+ switch (runtime->status->state) {
+ case SNDRV_PCM_STATE_RUNNING:
+ case SNDRV_PCM_STATE_PREPARED:
+ case SNDRV_PCM_STATE_PAUSED:
+ if (avail >= runtime->control->avail_min) {
+ mask = POLLOUT | POLLWRNORM;
+ break;
+ }
+ /* Fall through */
+ case SNDRV_PCM_STATE_DRAINING:
+ mask = 0;
+ break;
+ default:
+ mask = POLLOUT | POLLWRNORM | POLLERR;
+ break;
+ }
+ //giovanni snd_pcm_stream_unlock_irq(substream);
+ return mask;
+}
+
+static unsigned int snd_pcm_capture_poll(struct file *file, poll_table * wait)
+{
+ struct snd_pcm_file *pcm_file;
+ struct snd_pcm_substream *substream;
+ struct snd_pcm_runtime *runtime;
+ unsigned int mask;
+ snd_pcm_uframes_t avail;
+
+ pcm_file = file->private_data;
+
+ substream = pcm_file->substream;
+ if (PCM_RUNTIME_CHECK(substream))
+ return -ENXIO;
+ runtime = substream->runtime;
+
+ poll_wait(file, &runtime->sleep, wait);
+
+ //giovanni snd_pcm_stream_lock_irq(substream);
+ avail = snd_pcm_capture_avail(runtime);
+ switch (runtime->status->state) {
+ case SNDRV_PCM_STATE_RUNNING:
+ case SNDRV_PCM_STATE_PREPARED:
+ case SNDRV_PCM_STATE_PAUSED:
+ if (avail >= runtime->control->avail_min) {
+ mask = POLLIN | POLLRDNORM;
+ break;
+ }
+ mask = 0;
+ break;
+ case SNDRV_PCM_STATE_DRAINING:
+ if (avail > 0) {
+ mask = POLLIN | POLLRDNORM;
+ break;
+ }
+ /* Fall through */
+ default:
+ mask = POLLIN | POLLRDNORM | POLLERR;
+ break;
+ }
+ //giovanni snd_pcm_stream_unlock_irq(substream);
+ return mask;
+}
+
+/*
+ * mmap support
+ */
+
+/*
+ * Only on coherent architectures, we can mmap the status and the control records
+ * for effcient data transfer. On others, we have to use HWSYNC ioctl...
+ */
+#if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA)
+/*
+ * mmap status record
+ */
+static int snd_pcm_mmap_status_fault(struct vm_area_struct *area,
+ struct vm_fault *vmf)
+{
+ struct snd_pcm_substream *substream = area->vm_private_data;
+ struct snd_pcm_runtime *runtime;
+
+ if (substream == NULL)
+ return VM_FAULT_SIGBUS;
+ runtime = substream->runtime;
+ vmf->page = virt_to_page(runtime->status);
+ get_page(vmf->page);
+ return 0;
+}
+
+static const struct vm_operations_struct snd_pcm_vm_ops_status =
+{
+ .fault = snd_pcm_mmap_status_fault,
+};
+
+static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
+ struct vm_area_struct *area)
+{
+ struct snd_pcm_runtime *runtime;
+ long size;
+ if (!(area->vm_flags & VM_READ))
+ return -EINVAL;
+ runtime = substream->runtime;
+ size = area->vm_end - area->vm_start;
+ if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_status)))
+ return -EINVAL;
+ area->vm_ops = &snd_pcm_vm_ops_status;
+ area->vm_private_data = substream;
+ area->vm_flags |= VM_RESERVED;
+ return 0;
+}
+
+/*
+ * mmap control record
+ */
+static int snd_pcm_mmap_control_fault(struct vm_area_struct *area,
+ struct vm_fault *vmf)
+{
+ struct snd_pcm_substream *substream = area->vm_private_data;
+ struct snd_pcm_runtime *runtime;
+
+ if (substream == NULL)
+ return VM_FAULT_SIGBUS;
+ runtime = substream->runtime;
+ vmf->page = virt_to_page(runtime->control);
+ get_page(vmf->page);
+ return 0;
+}
+
+static const struct vm_operations_struct snd_pcm_vm_ops_control =
+{
+ .fault = snd_pcm_mmap_control_fault,
+};
+
+static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
+ struct vm_area_struct *area)
+{
+ struct snd_pcm_runtime *runtime;
+ long size;
+ if (!(area->vm_flags & VM_READ))
+ return -EINVAL;
+ runtime = substream->runtime;
+ size = area->vm_end - area->vm_start;
+ if (size != PAGE_ALIGN(sizeof(struct snd_pcm_mmap_control)))
+ return -EINVAL;
+ area->vm_ops = &snd_pcm_vm_ops_control;
+ area->vm_private_data = substream;
+ area->vm_flags |= VM_RESERVED;
+ return 0;
+}
+#else /* ! coherent mmap */
+/*
+ * don't support mmap for status and control records.
+ */
+static int snd_pcm_mmap_status(struct snd_pcm_substream *substream, struct file *file,
+ struct vm_area_struct *area)
+{
+ return -ENXIO;
+}
+static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file *file,
+ struct vm_area_struct *area)
+{
+ return -ENXIO;
+}
+#endif /* coherent mmap */
+
+static inline struct page *
+snd_pcm_default_page_ops(struct snd_pcm_substream *substream, unsigned long ofs)
+{
+ void *vaddr = substream->runtime->dma_area + ofs;
+#if defined(CONFIG_MIPS) && defined(CONFIG_DMA_NONCOHERENT)
+ if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV)
+ return virt_to_page(CAC_ADDR(vaddr));
+#endif
+#if defined(CONFIG_PPC32) && defined(CONFIG_NOT_COHERENT_CACHE)
+ if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV) {
+ dma_addr_t addr = substream->runtime->dma_addr + ofs;
+ addr -= get_dma_offset(substream->dma_buffer.dev.dev);
+ /* assume dma_handle set via pfn_to_phys() in
+ * mm/dma-noncoherent.c
+ */
+ return pfn_to_page(addr >> PAGE_SHIFT);
+ }
+#endif
+ return virt_to_page(vaddr);
+}
+
+/*
+ * fault callback for mmapping a RAM page
+ */
+static int snd_pcm_mmap_data_fault(struct vm_area_struct *area,
+ struct vm_fault *vmf)
+{
+ struct snd_pcm_substream *substream = area->vm_private_data;
+ struct snd_pcm_runtime *runtime;
+ unsigned long offset;
+ struct page * page;
+ size_t dma_bytes;
+
+ if (substream == NULL)
+ return VM_FAULT_SIGBUS;
+ runtime = substream->runtime;
+ offset = vmf->pgoff << PAGE_SHIFT;
+ dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
+ if (offset > dma_bytes - PAGE_SIZE)
+ return VM_FAULT_SIGBUS;
+ if (substream->ops->page)
+ page = substream->ops->page(substream, offset);
+ else
+ page = snd_pcm_default_page_ops(substream, offset);
+ if (!page)
+ return VM_FAULT_SIGBUS;
+ get_page(page);
+ vmf->page = page;
+ return 0;
+}
+
+static const struct vm_operations_struct snd_pcm_vm_ops_data = {
+ .open = snd_pcm_mmap_data_open,
+ .close = snd_pcm_mmap_data_close,
+};
+
+static const struct vm_operations_struct snd_pcm_vm_ops_data_fault = {
+ .open = snd_pcm_mmap_data_open,
+ .close = snd_pcm_mmap_data_close,
+ .fault = snd_pcm_mmap_data_fault,
+};
+
+#ifndef ARCH_HAS_DMA_MMAP_COHERENT
+/* This should be defined / handled globally! */
+#ifdef CONFIG_ARM
+#define ARCH_HAS_DMA_MMAP_COHERENT
+#endif
+#endif
+
+/*
+ * mmap the DMA buffer on RAM
+ */
+static int snd_pcm_default_mmap(struct snd_pcm_substream *substream,
+ struct vm_area_struct *area)
+{
+ area->vm_flags |= VM_RESERVED;
+#ifdef ARCH_HAS_DMA_MMAP_COHERENT
+ if (!substream->ops->page &&
+ substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV)
+ return dma_mmap_coherent(substream->dma_buffer.dev.dev,
+ area,
+ substream->runtime->dma_area,
+ substream->runtime->dma_addr,
+ area->vm_end - area->vm_start);
+#endif /* ARCH_HAS_DMA_MMAP_COHERENT */
+ /* mmap with fault handler */
+ area->vm_ops = &snd_pcm_vm_ops_data_fault;
+ return 0;
+}
+
+/*
+ * mmap the DMA buffer on I/O memory area
+ */
+#if SNDRV_PCM_INFO_MMAP_IOMEM
+int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream,
+ struct vm_area_struct *area)
+{
+ long size;
+ unsigned long offset;
+
+ area->vm_page_prot = pgprot_noncached(area->vm_page_prot);
+ area->vm_flags |= VM_IO;
+ size = area->vm_end - area->vm_start;
+ offset = area->vm_pgoff << PAGE_SHIFT;
+ if (io_remap_pfn_range(area, area->vm_start,
+ (substream->runtime->dma_addr + offset) >> PAGE_SHIFT,
+ size, area->vm_page_prot))
+ return -EAGAIN;
+ return 0;
+}
+
+EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem);
+#endif /* SNDRV_PCM_INFO_MMAP */
+
+/* mmap callback with pgprot_noncached */
+int snd_pcm_lib_mmap_noncached(struct snd_pcm_substream *substream,
+ struct vm_area_struct *area)
+{
+ area->vm_page_prot = pgprot_noncached(area->vm_page_prot);
+ return snd_pcm_default_mmap(substream, area);
+}
+EXPORT_SYMBOL(snd_pcm_lib_mmap_noncached);
+
+/*
+ * mmap DMA buffer
+ */
+int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file,
+ struct vm_area_struct *area)
+{
+ struct snd_pcm_runtime *runtime;
+ long size;
+ unsigned long offset;
+ size_t dma_bytes;
+ int err;
+
+ if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
+ if (!(area->vm_flags & (VM_WRITE|VM_READ)))
+ return -EINVAL;
+ } else {
+ if (!(area->vm_flags & VM_READ))
+ return -EINVAL;
+ }
+ runtime = substream->runtime;
+ if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
+ return -EBADFD;
+ if (!(runtime->info & SNDRV_PCM_INFO_MMAP))
+ return -ENXIO;
+ if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED ||
+ runtime->access == SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
+ return -EINVAL;
+ size = area->vm_end - area->vm_start;
+ offset = area->vm_pgoff << PAGE_SHIFT;
+ dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
+ if ((size_t)size > dma_bytes)
+ return -EINVAL;
+ if (offset > dma_bytes - size)
+ return -EINVAL;
+
+ area->vm_ops = &snd_pcm_vm_ops_data;
+ area->vm_private_data = substream;
+ if (substream->ops->mmap)
+ err = substream->ops->mmap(substream, area);
+ else
+ err = snd_pcm_default_mmap(substream, area);
+ if (!err)
+ atomic_inc(&substream->mmap_count);
+ return err;
+}
+
+EXPORT_SYMBOL(snd_pcm_mmap_data);
+
+static int snd_pcm_mmap(struct file *file, struct vm_area_struct *area)
+{
+ struct snd_pcm_file * pcm_file;
+ struct snd_pcm_substream *substream;
+ unsigned long offset;
+
+ pcm_file = file->private_data;
+ substream = pcm_file->substream;
+ if (PCM_RUNTIME_CHECK(substream))
+ return -ENXIO;
+
+ offset = area->vm_pgoff << PAGE_SHIFT;
+ switch (offset) {
+ case SNDRV_PCM_MMAP_OFFSET_STATUS:
+ if (pcm_file->no_compat_mmap)
+ return -ENXIO;
+ return snd_pcm_mmap_status(substream, file, area);
+ case SNDRV_PCM_MMAP_OFFSET_CONTROL:
+ if (pcm_file->no_compat_mmap)
+ return -ENXIO;
+ return snd_pcm_mmap_control(substream, file, area);
+ default:
+ return snd_pcm_mmap_data(substream, file, area);
+ }
+ return 0;
+}
+
+static int snd_pcm_fasync(int fd, struct file * file, int on)
+{
+ struct snd_pcm_file * pcm_file;
+ struct snd_pcm_substream *substream;
+ struct snd_pcm_runtime *runtime;
+
+ pcm_file = file->private_data;
+ substream = pcm_file->substream;
+ if (PCM_RUNTIME_CHECK(substream))
+ return -ENXIO;
+ runtime = substream->runtime;
+ return fasync_helper(fd, file, on, &runtime->fasync);
+}
+
+/*
+ * ioctl32 compat
+ */
+#ifdef CONFIG_COMPAT
+#include "pcm_compat.c"
+#else
+#define snd_pcm_ioctl_compat NULL
+#endif
+
+/*
+ * To be removed helpers to keep binary compatibility
+ */
+
+#ifdef CONFIG_SND_SUPPORT_OLD_API
+#define __OLD_TO_NEW_MASK(x) ((x&7)|((x&0x07fffff8)<<5))
+#define __NEW_TO_OLD_MASK(x) ((x&7)|((x&0xffffff00)>>5))
+
+static void snd_pcm_hw_convert_from_old_params(struct snd_pcm_hw_params *params,
+ struct snd_pcm_hw_params_old *oparams)
+{
+ unsigned int i;
+
+ memset(params, 0, sizeof(*params));
+ params->flags = oparams->flags;
+ for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
+ params->masks[i].bits[0] = oparams->masks[i];
+ memcpy(params->intervals, oparams->intervals, sizeof(oparams->intervals));
+ params->rmask = __OLD_TO_NEW_MASK(oparams->rmask);
+ params->cmask = __OLD_TO_NEW_MASK(oparams->cmask);
+ params->info = oparams->info;
+ params->msbits = oparams->msbits;
+ params->rate_num = oparams->rate_num;
+ params->rate_den = oparams->rate_den;
+ params->fifo_size = oparams->fifo_size;
+}
+
+static void snd_pcm_hw_convert_to_old_params(struct snd_pcm_hw_params_old *oparams,
+ struct snd_pcm_hw_params *params)
+{
+ unsigned int i;
+
+ memset(oparams, 0, sizeof(*oparams));
+ oparams->flags = params->flags;
+ for (i = 0; i < ARRAY_SIZE(oparams->masks); i++)
+ oparams->masks[i] = params->masks[i].bits[0];
+ memcpy(oparams->intervals, params->intervals, sizeof(oparams->intervals));
+ oparams->rmask = __NEW_TO_OLD_MASK(params->rmask);
+ oparams->cmask = __NEW_TO_OLD_MASK(params->cmask);
+ oparams->info = params->info;
+ oparams->msbits = params->msbits;
+ oparams->rate_num = params->rate_num;
+ oparams->rate_den = params->rate_den;
+ oparams->fifo_size = params->fifo_size;
+}
+
+static int snd_pcm_hw_refine_old_user(struct snd_pcm_substream *substream,
+ struct snd_pcm_hw_params_old __user * _oparams)
+{
+ struct snd_pcm_hw_params *params;
+ struct snd_pcm_hw_params_old *oparams = NULL;
+ int err;
+
+ params = kmalloc(sizeof(*params), GFP_KERNEL);
+ if (!params)
+ return -ENOMEM;
+
+ oparams = memdup_user(_oparams, sizeof(*oparams));
+ if (IS_ERR(oparams)) {
+ err = PTR_ERR(oparams);
+ goto out;
+ }
+ snd_pcm_hw_convert_from_old_params(params, oparams);
+ err = snd_pcm_hw_refine(substream, params);
+ snd_pcm_hw_convert_to_old_params(oparams, params);
+ if (copy_to_user(_oparams, oparams, sizeof(*oparams))) {
+ if (!err)
+ err = -EFAULT;
+ }
+
+ kfree(oparams);
+out:
+ kfree(params);
+ return err;
+}
+
+static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
+ struct snd_pcm_hw_params_old __user * _oparams)
+{
+ struct snd_pcm_hw_params *params;
+ struct snd_pcm_hw_params_old *oparams = NULL;
+ int err;
+
+ params = kmalloc(sizeof(*params), GFP_KERNEL);
+ if (!params)
+ return -ENOMEM;
+
+ oparams = memdup_user(_oparams, sizeof(*oparams));
+ if (IS_ERR(oparams)) {
+ err = PTR_ERR(oparams);
+ goto out;
+ }
+ snd_pcm_hw_convert_from_old_params(params, oparams);
+ err = snd_pcm_hw_params(substream, params);
+ snd_pcm_hw_convert_to_old_params(oparams, params);
+ if (copy_to_user(_oparams, oparams, sizeof(*oparams))) {
+ if (!err)
+ err = -EFAULT;
+ }
+
+ kfree(oparams);
+out:
+ kfree(params);
+ return err;
+}
+#endif /* CONFIG_SND_SUPPORT_OLD_API */
+
+#ifndef CONFIG_MMU
+static unsigned long snd_pcm_get_unmapped_area(struct file *file,
+ unsigned long addr,
+ unsigned long len,
+ unsigned long pgoff,
+ unsigned long flags)
+{
+ struct snd_pcm_file *pcm_file = file->private_data;
+ struct snd_pcm_substream *substream = pcm_file->substream;
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ unsigned long offset = pgoff << PAGE_SHIFT;
+
+ switch (offset) {
+ case SNDRV_PCM_MMAP_OFFSET_STATUS:
+ return (unsigned long)runtime->status;
+ case SNDRV_PCM_MMAP_OFFSET_CONTROL:
+ return (unsigned long)runtime->control;
+ default:
+ return (unsigned long)runtime->dma_area + offset;
+ }
+}
+#else
+# define snd_pcm_get_unmapped_area NULL
+#endif
+
+/*
+ * Register section
+ */
+
+const struct file_operations snd_pcm_f_ops[2] = {
+ {
+ .owner = THIS_MODULE,
+ .write = snd_pcm_write,
+ .aio_write = snd_pcm_aio_write,
+ .open = snd_pcm_playback_open,
+ .release = snd_pcm_release,
+ .llseek = no_llseek,
+ .poll = snd_pcm_playback_poll,
+ .unlocked_ioctl = snd_pcm_playback_ioctl,
+ .compat_ioctl = snd_pcm_ioctl_compat,
+ .mmap = snd_pcm_mmap,
+ .fasync = snd_pcm_fasync,
+ .get_unmapped_area = snd_pcm_get_unmapped_area,
+ },
+ {
+ .owner = THIS_MODULE,
+ .read = snd_pcm_read,
+ .aio_read = snd_pcm_aio_read,
+ .open = snd_pcm_capture_open,
+ .release = snd_pcm_release,
+ .llseek = no_llseek,
+ .poll = snd_pcm_capture_poll,
+ .unlocked_ioctl = snd_pcm_capture_ioctl,
+ .compat_ioctl = snd_pcm_ioctl_compat,
+ .mmap = snd_pcm_mmap,
+ .fasync = snd_pcm_fasync,
+ .get_unmapped_area = snd_pcm_get_unmapped_area,
+ }
+};
projects / thirdparty / freeswitch.git / commitdiff
