diff options
Diffstat (limited to 'sound/core/pcm_lib.c')
| -rw-r--r-- | sound/core/pcm_lib.c | 2289 |
1 files changed, 2289 insertions, 0 deletions
diff --git a/sound/core/pcm_lib.c b/sound/core/pcm_lib.c new file mode 100644 index 00000000..4d189411 --- /dev/null +++ b/sound/core/pcm_lib.c @@ -0,0 +1,2289 @@ +/* + * 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 <linux/export.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); + if (avail > runtime->buffer_size) + avail = runtime->buffer_size; + 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; + } +} + +#ifdef CONFIG_SND_DEBUG +void snd_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); +} +EXPORT_SYMBOL(snd_pcm_debug_name); +#endif + +#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]; + snd_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 int in_interrupt; + 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, int in_interrupt) +{ + 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->in_interrupt = in_interrupt; + 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; + snd_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: %sj=%lu, pos=%ld/%ld/%ld, " + "hwptr=%ld/%ld\n", + name, entry->in_interrupt ? "[Q] " : "", + 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, in_interrupt) 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 (runtime->twake) { + if (avail >= runtime->twake) + wake_up(&runtime->tsleep); + } else if (avail >= runtime->control->avail_min) + wake_up(&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]; + snd_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, in_interrupt); + 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) { + /* check for double acknowledged interrupts */ + hdelta = jiffies - runtime->hw_ptr_jiffies; + if (hdelta > runtime->hw_ptr_buffer_jiffies/2) { + 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; + if (delta < 0) + delta += runtime->boundary; + if (xrun_debug(substream, in_interrupt ? + XRUN_DEBUG_PERIODUPDATE : XRUN_DEBUG_HWPTRUPDATE)) { + char name[16]; + snd_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); + } + + if (runtime->no_period_wakeup) { + snd_pcm_sframes_t xrun_threshold; + /* + * Without regular period interrupts, we have to check + * the elapsed time to detect xruns. + */ + jdelta = jiffies - runtime->hw_ptr_jiffies; + if (jdelta < runtime->hw_ptr_buffer_jiffies / 2) + goto no_delta_check; + hdelta = jdelta - delta * HZ / runtime->rate; + xrun_threshold = runtime->hw_ptr_buffer_jiffies / 2 + 1; + while (hdelta > xrun_threshold) { + delta += runtime->buffer_size; + hw_base += runtime->buffer_size; + if (hw_base >= runtime->boundary) + hw_base = 0; + new_hw_ptr = hw_base + pos; + hdelta -= runtime->hw_ptr_buffer_jiffies; + } + goto no_delta_check; + } + + /* 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); + } + + no_delta_check: + 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) { + delta = new_hw_ptr - runtime->hw_ptr_interrupt; + if (delta < 0) + delta += runtime->boundary; + delta -= (snd_pcm_uframes_t)delta % runtime->period_size; + runtime->hw_ptr_interrupt += delta; + if (runtime->hw_ptr_interrupt >= runtime->boundary) + runtime->hw_ptr_interrupt -= runtime->boundary; + } + 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, + const 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) { + va_end(args); + 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))) { + va_end(args); + 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 int snd_pcm_hw_rule_noresample_func(struct snd_pcm_hw_params *params, + struct snd_pcm_hw_rule *rule) +{ + unsigned int base_rate = (unsigned int)(uintptr_t)rule->private; + struct snd_interval *rate; + + rate = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE); + return snd_interval_list(rate, 1, &base_rate, 0); +} + +/** + * snd_pcm_hw_rule_noresample - add a rule to allow disabling hw resampling + * @runtime: PCM runtime instance + * @base_rate: the rate at which the hardware does not resample + */ +int snd_pcm_hw_rule_noresample(struct snd_pcm_runtime *runtime, + unsigned int base_rate) +{ + return snd_pcm_hw_rule_add(runtime, SNDRV_PCM_HW_PARAMS_NORESAMPLE, + SNDRV_PCM_HW_PARAM_RATE, + snd_pcm_hw_rule_noresample_func, + (void *)(uintptr_t)base_rate, + SNDRV_PCM_HW_PARAM_RATE, -1); +} +EXPORT_SYMBOL(snd_pcm_hw_rule_noresample); + +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); + + snd_pcm_stream_lock_irqsave(substream, flags); + 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: + snd_pcm_stream_unlock_irqrestore(substream, flags); + 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(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 wait_time, tout; + + init_waitqueue_entry(&wait, current); + set_current_state(TASK_INTERRUPTIBLE); + add_wait_queue(&runtime->tsleep, &wait); + + if (runtime->no_period_wakeup) + wait_time = MAX_SCHEDULE_TIMEOUT; + else { + wait_time = 10; + if (runtime->rate) { + long t = runtime->period_size * 2 / runtime->rate; + wait_time = max(t, wait_time); + } + wait_time = msecs_to_jiffies(wait_time * 1000); + } + + for (;;) { + if (signal_pending(current)) { + err = -ERESTARTSYS; + break; + } + + /* + * We need to check if space became available already + * (and thus the wakeup happened already) first to close + * the race of space already having become available. + * This check must happen after been added to the waitqueue + * and having current state be INTERRUPTIBLE. + */ + if (is_playback) + avail = snd_pcm_playback_avail(runtime); + else + avail = snd_pcm_capture_avail(runtime); + if (avail >= runtime->twake) + break; + snd_pcm_stream_unlock_irq(substream); + + tout = schedule_timeout(wait_time); + + snd_pcm_stream_lock_irq(substream); + set_current_state(TASK_INTERRUPTIBLE); + 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; + } + } + _endloop: + set_current_state(TASK_RUNNING); + 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; + + 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 = runtime->control->avail_min ? : 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; + } + runtime->twake = min_t(snd_pcm_uframes_t, size, + runtime->control->avail_min ? : 1); + err = wait_for_avail(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; + snd_pcm_stream_unlock_irq(substream); + return -EINVAL; + } + appl_ptr = runtime->control->appl_ptr; + appl_ofs = appl_ptr % runtime->buffer_size; + snd_pcm_stream_unlock_irq(substream); + err = transfer(substream, appl_ofs, data, offset, frames); + 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); + 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; + + 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 = runtime->control->avail_min ? : 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; + } + runtime->twake = min_t(snd_pcm_uframes_t, size, + runtime->control->avail_min ? : 1); + err = wait_for_avail(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; + snd_pcm_stream_unlock_irq(substream); + return -EINVAL; + } + appl_ptr = runtime->control->appl_ptr; + appl_ofs = appl_ptr % runtime->buffer_size; + snd_pcm_stream_unlock_irq(substream); + err = transfer(substream, appl_ofs, data, offset, frames); + 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); + 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); |