| /* |
| * Digital Audio (PCM) abstract layer |
| * Copyright (c) by Jaroslav Kysela <perex@suse.cz> |
| * Abramo Bagnara <abramo@alsa-project.org> |
| * |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; either version 2 of the License, or |
| * (at your option) any later version. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write to the Free Software |
| * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| * |
| */ |
| |
| #include <sound/driver.h> |
| #include <linux/slab.h> |
| #include <linux/time.h> |
| #include <sound/core.h> |
| #include <sound/control.h> |
| #include <sound/info.h> |
| #include <sound/pcm.h> |
| #include <sound/pcm_params.h> |
| #include <sound/timer.h> |
| |
| /* |
| * fill ring buffer with silence |
| * runtime->silence_start: starting pointer to silence area |
| * runtime->silence_filled: size filled with silence |
| * runtime->silence_threshold: threshold from application |
| * runtime->silence_size: maximal size from application |
| * |
| * when runtime->silence_size >= runtime->boundary - fill processed area with silence immediately |
| */ |
| void snd_pcm_playback_silence(snd_pcm_substream_t *substream, snd_pcm_uframes_t new_hw_ptr) |
| { |
| snd_pcm_runtime_t *runtime = substream->runtime; |
| snd_pcm_uframes_t frames, ofs, transfer; |
| |
| if (runtime->silence_size < runtime->boundary) { |
| snd_pcm_sframes_t noise_dist, n; |
| if (runtime->silence_start != runtime->control->appl_ptr) { |
| n = runtime->control->appl_ptr - runtime->silence_start; |
| if (n < 0) |
| n += runtime->boundary; |
| if ((snd_pcm_uframes_t)n < runtime->silence_filled) |
| runtime->silence_filled -= n; |
| else |
| runtime->silence_filled = 0; |
| runtime->silence_start = runtime->control->appl_ptr; |
| } |
| if (runtime->silence_filled == runtime->buffer_size) |
| return; |
| snd_assert(runtime->silence_filled <= runtime->buffer_size, return); |
| noise_dist = snd_pcm_playback_hw_avail(runtime) + runtime->silence_filled; |
| if (noise_dist >= (snd_pcm_sframes_t) runtime->silence_threshold) |
| return; |
| frames = runtime->silence_threshold - noise_dist; |
| if (frames > runtime->silence_size) |
| frames = runtime->silence_size; |
| } else { |
| if (new_hw_ptr == ULONG_MAX) { /* initialization */ |
| snd_pcm_sframes_t avail = snd_pcm_playback_hw_avail(runtime); |
| runtime->silence_filled = avail > 0 ? avail : 0; |
| runtime->silence_start = (runtime->status->hw_ptr + |
| runtime->silence_filled) % |
| runtime->boundary; |
| } else { |
| ofs = runtime->status->hw_ptr; |
| frames = new_hw_ptr - ofs; |
| if ((snd_pcm_sframes_t)frames < 0) |
| frames += runtime->boundary; |
| runtime->silence_filled -= frames; |
| if ((snd_pcm_sframes_t)runtime->silence_filled < 0) { |
| runtime->silence_filled = 0; |
| runtime->silence_start = (ofs + frames) - runtime->buffer_size; |
| } else { |
| runtime->silence_start = ofs - runtime->silence_filled; |
| } |
| if ((snd_pcm_sframes_t)runtime->silence_start < 0) |
| runtime->silence_start += runtime->boundary; |
| } |
| frames = runtime->buffer_size - runtime->silence_filled; |
| } |
| snd_assert(frames <= runtime->buffer_size, return); |
| if (frames == 0) |
| return; |
| ofs = (runtime->silence_start + runtime->silence_filled) % runtime->buffer_size; |
| while (frames > 0) { |
| transfer = ofs + frames > runtime->buffer_size ? runtime->buffer_size - ofs : frames; |
| if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED || |
| runtime->access == SNDRV_PCM_ACCESS_MMAP_INTERLEAVED) { |
| if (substream->ops->silence) { |
| int err; |
| err = substream->ops->silence(substream, -1, ofs, transfer); |
| snd_assert(err >= 0, ); |
| } else { |
| char *hwbuf = runtime->dma_area + frames_to_bytes(runtime, ofs); |
| snd_pcm_format_set_silence(runtime->format, hwbuf, transfer * runtime->channels); |
| } |
| } else { |
| unsigned int c; |
| unsigned int channels = runtime->channels; |
| if (substream->ops->silence) { |
| for (c = 0; c < channels; ++c) { |
| int err; |
| err = substream->ops->silence(substream, c, ofs, transfer); |
| snd_assert(err >= 0, ); |
| } |
| } else { |
| size_t dma_csize = runtime->dma_bytes / channels; |
| for (c = 0; c < channels; ++c) { |
| char *hwbuf = runtime->dma_area + (c * dma_csize) + samples_to_bytes(runtime, ofs); |
| snd_pcm_format_set_silence(runtime->format, hwbuf, transfer); |
| } |
| } |
| } |
| runtime->silence_filled += transfer; |
| frames -= transfer; |
| ofs = 0; |
| } |
| } |
| |
| static void xrun(snd_pcm_substream_t *substream) |
| { |
| snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN); |
| #ifdef CONFIG_SND_DEBUG |
| if (substream->pstr->xrun_debug) { |
| snd_printd(KERN_DEBUG "XRUN: pcmC%dD%d%c\n", |
| substream->pcm->card->number, |
| substream->pcm->device, |
| substream->stream ? 'c' : 'p'); |
| if (substream->pstr->xrun_debug > 1) |
| dump_stack(); |
| } |
| #endif |
| } |
| |
| static inline snd_pcm_uframes_t snd_pcm_update_hw_ptr_pos(snd_pcm_substream_t *substream, |
| snd_pcm_runtime_t *runtime) |
| { |
| snd_pcm_uframes_t pos; |
| |
| pos = substream->ops->pointer(substream); |
| if (pos == SNDRV_PCM_POS_XRUN) |
| return pos; /* XRUN */ |
| if (runtime->tstamp_mode & SNDRV_PCM_TSTAMP_MMAP) |
| snd_timestamp_now((snd_timestamp_t*)&runtime->status->tstamp, runtime->tstamp_timespec); |
| #ifdef CONFIG_SND_DEBUG |
| if (pos >= runtime->buffer_size) { |
| snd_printk(KERN_ERR "BUG: stream = %i, pos = 0x%lx, buffer size = 0x%lx, period size = 0x%lx\n", substream->stream, pos, runtime->buffer_size, runtime->period_size); |
| } |
| #endif |
| pos -= pos % runtime->min_align; |
| return pos; |
| } |
| |
| static inline int snd_pcm_update_hw_ptr_post(snd_pcm_substream_t *substream, |
| snd_pcm_runtime_t *runtime) |
| { |
| snd_pcm_uframes_t avail; |
| |
| if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) |
| avail = snd_pcm_playback_avail(runtime); |
| else |
| avail = snd_pcm_capture_avail(runtime); |
| if (avail > runtime->avail_max) |
| runtime->avail_max = avail; |
| if (avail >= runtime->stop_threshold) { |
| if (substream->runtime->status->state == SNDRV_PCM_STATE_DRAINING) |
| snd_pcm_drain_done(substream); |
| else |
| xrun(substream); |
| return -EPIPE; |
| } |
| if (avail >= runtime->control->avail_min) |
| wake_up(&runtime->sleep); |
| return 0; |
| } |
| |
| static inline int snd_pcm_update_hw_ptr_interrupt(snd_pcm_substream_t *substream) |
| { |
| snd_pcm_runtime_t *runtime = substream->runtime; |
| snd_pcm_uframes_t pos; |
| snd_pcm_uframes_t new_hw_ptr, hw_ptr_interrupt; |
| snd_pcm_sframes_t delta; |
| |
| pos = snd_pcm_update_hw_ptr_pos(substream, runtime); |
| if (pos == SNDRV_PCM_POS_XRUN) { |
| xrun(substream); |
| return -EPIPE; |
| } |
| if (runtime->period_size == runtime->buffer_size) |
| goto __next_buf; |
| new_hw_ptr = runtime->hw_ptr_base + pos; |
| hw_ptr_interrupt = runtime->hw_ptr_interrupt + runtime->period_size; |
| |
| delta = hw_ptr_interrupt - new_hw_ptr; |
| if (delta > 0) { |
| if ((snd_pcm_uframes_t)delta < runtime->buffer_size / 2) { |
| #ifdef CONFIG_SND_DEBUG |
| if (runtime->periods > 1 && substream->pstr->xrun_debug) { |
| snd_printd(KERN_ERR "Unexpected hw_pointer value [1] (stream = %i, delta: -%ld, max jitter = %ld): wrong interrupt acknowledge?\n", substream->stream, (long) delta, runtime->buffer_size / 2); |
| if (substream->pstr->xrun_debug > 1) |
| dump_stack(); |
| } |
| #endif |
| return 0; |
| } |
| __next_buf: |
| runtime->hw_ptr_base += runtime->buffer_size; |
| if (runtime->hw_ptr_base == runtime->boundary) |
| runtime->hw_ptr_base = 0; |
| new_hw_ptr = runtime->hw_ptr_base + pos; |
| } |
| |
| if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && |
| runtime->silence_size > 0) |
| snd_pcm_playback_silence(substream, new_hw_ptr); |
| |
| runtime->status->hw_ptr = new_hw_ptr; |
| runtime->hw_ptr_interrupt = new_hw_ptr - new_hw_ptr % runtime->period_size; |
| |
| return snd_pcm_update_hw_ptr_post(substream, runtime); |
| } |
| |
| /* CAUTION: call it with irq disabled */ |
| int snd_pcm_update_hw_ptr(snd_pcm_substream_t *substream) |
| { |
| snd_pcm_runtime_t *runtime = substream->runtime; |
| snd_pcm_uframes_t pos; |
| snd_pcm_uframes_t old_hw_ptr, new_hw_ptr; |
| snd_pcm_sframes_t delta; |
| |
| old_hw_ptr = runtime->status->hw_ptr; |
| pos = snd_pcm_update_hw_ptr_pos(substream, runtime); |
| if (pos == SNDRV_PCM_POS_XRUN) { |
| xrun(substream); |
| return -EPIPE; |
| } |
| new_hw_ptr = runtime->hw_ptr_base + pos; |
| |
| delta = old_hw_ptr - new_hw_ptr; |
| if (delta > 0) { |
| if ((snd_pcm_uframes_t)delta < runtime->buffer_size / 2) { |
| #ifdef CONFIG_SND_DEBUG |
| if (runtime->periods > 2 && substream->pstr->xrun_debug) { |
| snd_printd(KERN_ERR "Unexpected hw_pointer value [2] (stream = %i, delta: -%ld, max jitter = %ld): wrong interrupt acknowledge?\n", substream->stream, (long) delta, runtime->buffer_size / 2); |
| if (substream->pstr->xrun_debug > 1) |
| dump_stack(); |
| } |
| #endif |
| return 0; |
| } |
| runtime->hw_ptr_base += runtime->buffer_size; |
| if (runtime->hw_ptr_base == runtime->boundary) |
| runtime->hw_ptr_base = 0; |
| new_hw_ptr = runtime->hw_ptr_base + pos; |
| } |
| if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && |
| runtime->silence_size > 0) |
| snd_pcm_playback_silence(substream, new_hw_ptr); |
| |
| runtime->status->hw_ptr = new_hw_ptr; |
| |
| return snd_pcm_update_hw_ptr_post(substream, runtime); |
| } |
| |
| /** |
| * snd_pcm_set_ops - set the PCM operators |
| * @pcm: the pcm instance |
| * @direction: stream direction, SNDRV_PCM_STREAM_XXX |
| * @ops: the operator table |
| * |
| * Sets the given PCM operators to the pcm instance. |
| */ |
| void snd_pcm_set_ops(snd_pcm_t *pcm, int direction, snd_pcm_ops_t *ops) |
| { |
| snd_pcm_str_t *stream = &pcm->streams[direction]; |
| snd_pcm_substream_t *substream; |
| |
| for (substream = stream->substream; substream != NULL; substream = substream->next) |
| substream->ops = ops; |
| } |
| |
| |
| /** |
| * snd_pcm_sync - set the PCM sync id |
| * @substream: the pcm substream |
| * |
| * Sets the PCM sync identifier for the card. |
| */ |
| void snd_pcm_set_sync(snd_pcm_substream_t * substream) |
| { |
| snd_pcm_runtime_t *runtime = substream->runtime; |
| |
| runtime->sync.id32[0] = substream->pcm->card->number; |
| runtime->sync.id32[1] = -1; |
| runtime->sync.id32[2] = -1; |
| runtime->sync.id32[3] = -1; |
| } |
| |
| /* |
| * Standard ioctl routine |
| */ |
| |
| /* Code taken from alsa-lib */ |
| #define assert(a) snd_assert((a), return -EINVAL) |
| |
| static inline unsigned int div32(unsigned int a, unsigned int b, |
| unsigned int *r) |
| { |
| if (b == 0) { |
| *r = 0; |
| return UINT_MAX; |
| } |
| *r = a % b; |
| return a / b; |
| } |
| |
| static inline unsigned int div_down(unsigned int a, unsigned int b) |
| { |
| if (b == 0) |
| return UINT_MAX; |
| return a / b; |
| } |
| |
| static inline unsigned int div_up(unsigned int a, unsigned int b) |
| { |
| unsigned int r; |
| unsigned int q; |
| if (b == 0) |
| return UINT_MAX; |
| q = div32(a, b, &r); |
| if (r) |
| ++q; |
| return q; |
| } |
| |
| static inline unsigned int mul(unsigned int a, unsigned int b) |
| { |
| if (a == 0) |
| return 0; |
| if (div_down(UINT_MAX, a) < b) |
| return UINT_MAX; |
| return a * b; |
| } |
| |
| static inline unsigned int muldiv32(unsigned int a, unsigned int b, |
| unsigned int c, unsigned int *r) |
| { |
| u_int64_t n = (u_int64_t) a * b; |
| if (c == 0) { |
| snd_assert(n > 0, ); |
| *r = 0; |
| return UINT_MAX; |
| } |
| div64_32(&n, c, r); |
| if (n >= UINT_MAX) { |
| *r = 0; |
| return UINT_MAX; |
| } |
| return n; |
| } |
| |
| static int snd_interval_refine_min(snd_interval_t *i, unsigned int min, int openmin) |
| { |
| int changed = 0; |
| assert(!snd_interval_empty(i)); |
| if (i->min < min) { |
| i->min = min; |
| i->openmin = openmin; |
| changed = 1; |
| } else if (i->min == min && !i->openmin && openmin) { |
| i->openmin = 1; |
| changed = 1; |
| } |
| if (i->integer) { |
| if (i->openmin) { |
| i->min++; |
| i->openmin = 0; |
| } |
| } |
| if (snd_interval_checkempty(i)) { |
| snd_interval_none(i); |
| return -EINVAL; |
| } |
| return changed; |
| } |
| |
| static int snd_interval_refine_max(snd_interval_t *i, unsigned int max, int openmax) |
| { |
| int changed = 0; |
| assert(!snd_interval_empty(i)); |
| if (i->max > max) { |
| i->max = max; |
| i->openmax = openmax; |
| changed = 1; |
| } else if (i->max == max && !i->openmax && openmax) { |
| i->openmax = 1; |
| changed = 1; |
| } |
| if (i->integer) { |
| if (i->openmax) { |
| i->max--; |
| i->openmax = 0; |
| } |
| } |
| if (snd_interval_checkempty(i)) { |
| snd_interval_none(i); |
| return -EINVAL; |
| } |
| return changed; |
| } |
| |
| /** |
| * snd_interval_refine - refine the interval value of configurator |
| * @i: the interval value to refine |
| * @v: the interval value to refer to |
| * |
| * Refines the interval value with the reference value. |
| * The interval is changed to the range satisfying both intervals. |
| * The interval status (min, max, integer, etc.) are evaluated. |
| * |
| * Returns non-zero if the value is changed, zero if not changed. |
| */ |
| int snd_interval_refine(snd_interval_t *i, const snd_interval_t *v) |
| { |
| int changed = 0; |
| assert(!snd_interval_empty(i)); |
| if (i->min < v->min) { |
| i->min = v->min; |
| i->openmin = v->openmin; |
| changed = 1; |
| } else if (i->min == v->min && !i->openmin && v->openmin) { |
| i->openmin = 1; |
| changed = 1; |
| } |
| if (i->max > v->max) { |
| i->max = v->max; |
| i->openmax = v->openmax; |
| changed = 1; |
| } else if (i->max == v->max && !i->openmax && v->openmax) { |
| i->openmax = 1; |
| changed = 1; |
| } |
| if (!i->integer && v->integer) { |
| i->integer = 1; |
| changed = 1; |
| } |
| if (i->integer) { |
| if (i->openmin) { |
| i->min++; |
| i->openmin = 0; |
| } |
| if (i->openmax) { |
| i->max--; |
| i->openmax = 0; |
| } |
| } else if (!i->openmin && !i->openmax && i->min == i->max) |
| i->integer = 1; |
| if (snd_interval_checkempty(i)) { |
| snd_interval_none(i); |
| return -EINVAL; |
| } |
| return changed; |
| } |
| |
| static int snd_interval_refine_first(snd_interval_t *i) |
| { |
| assert(!snd_interval_empty(i)); |
| if (snd_interval_single(i)) |
| return 0; |
| i->max = i->min; |
| i->openmax = i->openmin; |
| if (i->openmax) |
| i->max++; |
| return 1; |
| } |
| |
| static int snd_interval_refine_last(snd_interval_t *i) |
| { |
| assert(!snd_interval_empty(i)); |
| if (snd_interval_single(i)) |
| return 0; |
| i->min = i->max; |
| i->openmin = i->openmax; |
| if (i->openmin) |
| i->min--; |
| return 1; |
| } |
| |
| static int snd_interval_refine_set(snd_interval_t *i, unsigned int val) |
| { |
| snd_interval_t t; |
| t.empty = 0; |
| t.min = t.max = val; |
| t.openmin = t.openmax = 0; |
| t.integer = 1; |
| return snd_interval_refine(i, &t); |
| } |
| |
| void snd_interval_mul(const snd_interval_t *a, const snd_interval_t *b, snd_interval_t *c) |
| { |
| if (a->empty || b->empty) { |
| snd_interval_none(c); |
| return; |
| } |
| c->empty = 0; |
| c->min = mul(a->min, b->min); |
| c->openmin = (a->openmin || b->openmin); |
| c->max = mul(a->max, b->max); |
| c->openmax = (a->openmax || b->openmax); |
| c->integer = (a->integer && b->integer); |
| } |
| |
| /** |
| * snd_interval_div - refine the interval value with division |
| * @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 snd_interval_t *a, const snd_interval_t *b, snd_interval_t *c) |
| { |
| unsigned int r; |
| if (a->empty || b->empty) { |
| snd_interval_none(c); |
| return; |
| } |
| c->empty = 0; |
| c->min = div32(a->min, b->max, &r); |
| c->openmin = (r || a->openmin || b->openmax); |
| if (b->min > 0) { |
| c->max = div32(a->max, b->min, &r); |
| if (r) { |
| c->max++; |
| c->openmax = 1; |
| } else |
| c->openmax = (a->openmax || b->openmin); |
| } else { |
| c->max = UINT_MAX; |
| c->openmax = 0; |
| } |
| c->integer = 0; |
| } |
| |
| /** |
| * snd_interval_muldivk - refine the interval value |
| * @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 snd_interval_t *a, const snd_interval_t *b, |
| unsigned int k, snd_interval_t *c) |
| { |
| unsigned int r; |
| if (a->empty || b->empty) { |
| snd_interval_none(c); |
| return; |
| } |
| c->empty = 0; |
| c->min = muldiv32(a->min, b->min, k, &r); |
| c->openmin = (r || a->openmin || b->openmin); |
| c->max = muldiv32(a->max, b->max, k, &r); |
| if (r) { |
| c->max++; |
| c->openmax = 1; |
| } else |
| c->openmax = (a->openmax || b->openmax); |
| c->integer = 0; |
| } |
| |
| /** |
| * snd_interval_mulkdiv - refine the interval value |
| * @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 snd_interval_t *a, unsigned int k, |
| const snd_interval_t *b, snd_interval_t *c) |
| { |
| unsigned int r; |
| if (a->empty || b->empty) { |
| snd_interval_none(c); |
| return; |
| } |
| c->empty = 0; |
| c->min = muldiv32(a->min, k, b->max, &r); |
| c->openmin = (r || a->openmin || b->openmax); |
| if (b->min > 0) { |
| c->max = muldiv32(a->max, k, b->min, &r); |
| if (r) { |
| c->max++; |
| c->openmax = 1; |
| } else |
| c->openmax = (a->openmax || b->openmin); |
| } else { |
| c->max = UINT_MAX; |
| c->openmax = 0; |
| } |
| c->integer = 0; |
| } |
| |
| #undef assert |
| /* ---- */ |
| |
| |
| /** |
| * snd_interval_ratnum - refine the interval value |
| * @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(snd_interval_t *i, |
| unsigned int rats_count, ratnum_t *rats, |
| unsigned int *nump, unsigned int *denp) |
| { |
| unsigned int best_num, best_diff, best_den; |
| unsigned int k; |
| snd_interval_t t; |
| int err; |
| |
| best_num = best_den = best_diff = 0; |
| for (k = 0; k < rats_count; ++k) { |
| unsigned int num = rats[k].num; |
| unsigned int den; |
| unsigned int q = i->min; |
| int diff; |
| if (q == 0) |
| q = 1; |
| den = div_down(num, q); |
| if (den < rats[k].den_min) |
| continue; |
| if (den > rats[k].den_max) |
| den = rats[k].den_max; |
| else { |
| unsigned int r; |
| r = (den - rats[k].den_min) % rats[k].den_step; |
| if (r != 0) |
| den -= r; |
| } |
| diff = num - q * den; |
| if (best_num == 0 || |
| diff * best_den < best_diff * den) { |
| best_diff = diff; |
| best_den = den; |
| best_num = num; |
| } |
| } |
| if (best_den == 0) { |
| i->empty = 1; |
| return -EINVAL; |
| } |
| t.min = div_down(best_num, best_den); |
| t.openmin = !!(best_num % best_den); |
| |
| best_num = best_den = best_diff = 0; |
| for (k = 0; k < rats_count; ++k) { |
| unsigned int num = rats[k].num; |
| unsigned int den; |
| unsigned int q = i->max; |
| int diff; |
| if (q == 0) { |
| i->empty = 1; |
| return -EINVAL; |
| } |
| den = div_up(num, q); |
| if (den > rats[k].den_max) |
| continue; |
| if (den < rats[k].den_min) |
| den = rats[k].den_min; |
| else { |
| unsigned int r; |
| r = (den - rats[k].den_min) % rats[k].den_step; |
| if (r != 0) |
| den += rats[k].den_step - r; |
| } |
| diff = q * den - num; |
| if (best_num == 0 || |
| diff * best_den < best_diff * den) { |
| best_diff = diff; |
| best_den = den; |
| best_num = num; |
| } |
| } |
| if (best_den == 0) { |
| i->empty = 1; |
| return -EINVAL; |
| } |
| t.max = div_up(best_num, best_den); |
| t.openmax = !!(best_num % best_den); |
| t.integer = 0; |
| err = snd_interval_refine(i, &t); |
| if (err < 0) |
| return err; |
| |
| if (snd_interval_single(i)) { |
| if (nump) |
| *nump = best_num; |
| if (denp) |
| *denp = best_den; |
| } |
| return err; |
| } |
| |
| /** |
| * snd_interval_ratden - refine the interval value |
| * @i: interval to refine |
| * @rats_count: number of ratden_t |
| * @rats: ratden_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. |
| */ |
| static int snd_interval_ratden(snd_interval_t *i, |
| unsigned int rats_count, ratden_t *rats, |
| unsigned int *nump, unsigned int *denp) |
| { |
| unsigned int best_num, best_diff, best_den; |
| unsigned int k; |
| snd_interval_t t; |
| int err; |
| |
| best_num = best_den = best_diff = 0; |
| for (k = 0; k < rats_count; ++k) { |
| unsigned int num; |
| unsigned int den = rats[k].den; |
| unsigned int q = i->min; |
| int diff; |
| num = mul(q, den); |
| if (num > rats[k].num_max) |
| continue; |
| if (num < rats[k].num_min) |
| num = rats[k].num_max; |
| else { |
| unsigned int r; |
| r = (num - rats[k].num_min) % rats[k].num_step; |
| if (r != 0) |
| num += rats[k].num_step - r; |
| } |
| diff = num - q * den; |
| if (best_num == 0 || |
| diff * best_den < best_diff * den) { |
| best_diff = diff; |
| best_den = den; |
| best_num = num; |
| } |
| } |
| if (best_den == 0) { |
| i->empty = 1; |
| return -EINVAL; |
| } |
| t.min = div_down(best_num, best_den); |
| t.openmin = !!(best_num % best_den); |
| |
| best_num = best_den = best_diff = 0; |
| for (k = 0; k < rats_count; ++k) { |
| unsigned int num; |
| unsigned int den = rats[k].den; |
| unsigned int q = i->max; |
| int diff; |
| num = mul(q, den); |
| if (num < rats[k].num_min) |
| continue; |
| if (num > rats[k].num_max) |
| num = rats[k].num_max; |
| else { |
| unsigned int r; |
| r = (num - rats[k].num_min) % rats[k].num_step; |
| if (r != 0) |
| num -= r; |
| } |
| diff = q * den - num; |
| if (best_num == 0 || |
| diff * best_den < best_diff * den) { |
| best_diff = diff; |
| best_den = den; |
| best_num = num; |
| } |
| } |
| if (best_den == 0) { |
| i->empty = 1; |
| return -EINVAL; |
| } |
| t.max = div_up(best_num, best_den); |
| t.openmax = !!(best_num % best_den); |
| t.integer = 0; |
| err = snd_interval_refine(i, &t); |
| if (err < 0) |
| return err; |
| |
| if (snd_interval_single(i)) { |
| if (nump) |
| *nump = best_num; |
| if (denp) |
| *denp = best_den; |
| } |
| return err; |
| } |
| |
| /** |
| * snd_interval_list - refine the interval value from the list |
| * @i: the interval value to refine |
| * @count: the number of elements in the list |
| * @list: the value list |
| * @mask: the bit-mask to evaluate |
| * |
| * Refines the interval value from the list. |
| * When mask is non-zero, only the elements corresponding to bit 1 are |
| * evaluated. |
| * |
| * Returns non-zero if the value is changed, zero if not changed. |
| */ |
| int snd_interval_list(snd_interval_t *i, unsigned int count, unsigned int *list, unsigned int mask) |
| { |
| unsigned int k; |
| int changed = 0; |
| for (k = 0; k < count; k++) { |
| if (mask && !(mask & (1 << k))) |
| continue; |
| if (i->min == list[k] && !i->openmin) |
| goto _l1; |
| if (i->min < list[k]) { |
| i->min = list[k]; |
| i->openmin = 0; |
| changed = 1; |
| goto _l1; |
| } |
| } |
| i->empty = 1; |
| return -EINVAL; |
| _l1: |
| for (k = count; k-- > 0;) { |
| if (mask && !(mask & (1 << k))) |
| continue; |
| if (i->max == list[k] && !i->openmax) |
| goto _l2; |
| if (i->max > list[k]) { |
| i->max = list[k]; |
| i->openmax = 0; |
| changed = 1; |
| goto _l2; |
| } |
| } |
| i->empty = 1; |
| return -EINVAL; |
| _l2: |
| if (snd_interval_checkempty(i)) { |
| i->empty = 1; |
| return -EINVAL; |
| } |
| return changed; |
| } |
| |
| static int snd_interval_step(snd_interval_t *i, unsigned int min, unsigned int step) |
| { |
| unsigned int n; |
| int changed = 0; |
| n = (i->min - min) % step; |
| if (n != 0 || i->openmin) { |
| i->min += step - n; |
| changed = 1; |
| } |
| n = (i->max - min) % step; |
| if (n != 0 || i->openmax) { |
| i->max -= n; |
| changed = 1; |
| } |
| if (snd_interval_checkempty(i)) { |
| i->empty = 1; |
| return -EINVAL; |
| } |
| return changed; |
| } |
| |
| /* Info constraints helpers */ |
| |
| /** |
| * snd_pcm_hw_rule_add - add the hw-constraint rule |
| * @runtime: the pcm runtime instance |
| * @cond: condition bits |
| * @var: the variable to evaluate |
| * @func: the evaluation function |
| * @private: the private data pointer passed to function |
| * @dep: the dependent variables |
| * |
| * Returns zero if successful, or a negative error code on failure. |
| */ |
| int snd_pcm_hw_rule_add(snd_pcm_runtime_t *runtime, unsigned int cond, |
| int var, |
| snd_pcm_hw_rule_func_t func, void *private, |
| int dep, ...) |
| { |
| snd_pcm_hw_constraints_t *constrs = &runtime->hw_constraints; |
| snd_pcm_hw_rule_t *c; |
| unsigned int k; |
| va_list args; |
| va_start(args, dep); |
| if (constrs->rules_num >= constrs->rules_all) { |
| snd_pcm_hw_rule_t *new; |
| unsigned int new_rules = constrs->rules_all + 16; |
| new = kcalloc(new_rules, sizeof(*c), GFP_KERNEL); |
| if (!new) |
| return -ENOMEM; |
| if (constrs->rules) { |
| memcpy(new, constrs->rules, |
| constrs->rules_num * sizeof(*c)); |
| kfree(constrs->rules); |
| } |
| constrs->rules = new; |
| constrs->rules_all = new_rules; |
| } |
| c = &constrs->rules[constrs->rules_num]; |
| c->cond = cond; |
| c->func = func; |
| c->var = var; |
| c->private = private; |
| k = 0; |
| while (1) { |
| snd_assert(k < ARRAY_SIZE(c->deps), return -EINVAL); |
| c->deps[k++] = dep; |
| if (dep < 0) |
| break; |
| dep = va_arg(args, int); |
| } |
| constrs->rules_num++; |
| va_end(args); |
| return 0; |
| } |
| |
| /** |
| * snd_pcm_hw_constraint_mask |
| * @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 mask parameter. |
| */ |
| int snd_pcm_hw_constraint_mask(snd_pcm_runtime_t *runtime, snd_pcm_hw_param_t var, |
| u_int32_t mask) |
| { |
| snd_pcm_hw_constraints_t *constrs = &runtime->hw_constraints; |
| snd_mask_t *maskp = constrs_mask(constrs, var); |
| *maskp->bits &= mask; |
| memset(maskp->bits + 1, 0, (SNDRV_MASK_MAX-32) / 8); /* clear rest */ |
| if (*maskp->bits == 0) |
| return -EINVAL; |
| return 0; |
| } |
| |
| /** |
| * snd_pcm_hw_constraint_mask64 |
| * @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 mask parameter. |
| */ |
| int snd_pcm_hw_constraint_mask64(snd_pcm_runtime_t *runtime, snd_pcm_hw_param_t var, |
| u_int64_t mask) |
| { |
| snd_pcm_hw_constraints_t *constrs = &runtime->hw_constraints; |
| snd_mask_t *maskp = constrs_mask(constrs, var); |
| maskp->bits[0] &= (u_int32_t)mask; |
| maskp->bits[1] &= (u_int32_t)(mask >> 32); |
| memset(maskp->bits + 2, 0, (SNDRV_MASK_MAX-64) / 8); /* clear rest */ |
| if (! maskp->bits[0] && ! maskp->bits[1]) |
| return -EINVAL; |
| return 0; |
| } |
| |
| /** |
| * snd_pcm_hw_constraint_integer |
| * @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(snd_pcm_runtime_t *runtime, snd_pcm_hw_param_t var) |
| { |
| snd_pcm_hw_constraints_t *constrs = &runtime->hw_constraints; |
| return snd_interval_setinteger(constrs_interval(constrs, var)); |
| } |
| |
| /** |
| * snd_pcm_hw_constraint_minmax |
| * @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(snd_pcm_runtime_t *runtime, snd_pcm_hw_param_t var, |
| unsigned int min, unsigned int max) |
| { |
| snd_pcm_hw_constraints_t *constrs = &runtime->hw_constraints; |
| snd_interval_t t; |
| t.min = min; |
| t.max = max; |
| t.openmin = t.openmax = 0; |
| t.integer = 0; |
| return snd_interval_refine(constrs_interval(constrs, var), &t); |
| } |
| |
| static int snd_pcm_hw_rule_list(snd_pcm_hw_params_t *params, |
| snd_pcm_hw_rule_t *rule) |
| { |
| snd_pcm_hw_constraint_list_t *list = rule->private; |
| return snd_interval_list(hw_param_interval(params, rule->var), list->count, list->list, list->mask); |
| } |
| |
| |
| /** |
| * snd_pcm_hw_constraint_list |
| * @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(snd_pcm_runtime_t *runtime, |
| unsigned int cond, |
| snd_pcm_hw_param_t var, |
| snd_pcm_hw_constraint_list_t *l) |
| { |
| return snd_pcm_hw_rule_add(runtime, cond, var, |
| snd_pcm_hw_rule_list, l, |
| var, -1); |
| } |
| |
| static int snd_pcm_hw_rule_ratnums(snd_pcm_hw_params_t *params, |
| snd_pcm_hw_rule_t *rule) |
| { |
| snd_pcm_hw_constraint_ratnums_t *r = rule->private; |
| unsigned int num = 0, den = 0; |
| int err; |
| err = snd_interval_ratnum(hw_param_interval(params, rule->var), |
| r->nrats, r->rats, &num, &den); |
| if (err >= 0 && den && rule->var == SNDRV_PCM_HW_PARAM_RATE) { |
| params->rate_num = num; |
| params->rate_den = den; |
| } |
| return err; |
| } |
| |
| /** |
| * snd_pcm_hw_constraint_ratnums |
| * @runtime: PCM runtime instance |
| * @cond: condition bits |
| * @var: hw_params variable to apply the ratnums constraint |
| * @r: ratnums_t constriants |
| */ |
| int snd_pcm_hw_constraint_ratnums(snd_pcm_runtime_t *runtime, |
| unsigned int cond, |
| snd_pcm_hw_param_t var, |
| snd_pcm_hw_constraint_ratnums_t *r) |
| { |
| return snd_pcm_hw_rule_add(runtime, cond, var, |
| snd_pcm_hw_rule_ratnums, r, |
| var, -1); |
| } |
| |
| static int snd_pcm_hw_rule_ratdens(snd_pcm_hw_params_t *params, |
| snd_pcm_hw_rule_t *rule) |
| { |
| snd_pcm_hw_constraint_ratdens_t *r = rule->private; |
| unsigned int num = 0, den = 0; |
| int err = snd_interval_ratden(hw_param_interval(params, rule->var), |
| r->nrats, r->rats, &num, &den); |
| if (err >= 0 && den && rule->var == SNDRV_PCM_HW_PARAM_RATE) { |
| params->rate_num = num; |
| params->rate_den = den; |
| } |
| return err; |
| } |
| |
| /** |
| * snd_pcm_hw_constraint_ratdens |
| * @runtime: PCM runtime instance |
| * @cond: condition bits |
| * @var: hw_params variable to apply the ratdens constraint |
| * @r: ratdens_t constriants |
| */ |
| int snd_pcm_hw_constraint_ratdens(snd_pcm_runtime_t *runtime, |
| unsigned int cond, |
| snd_pcm_hw_param_t var, |
| snd_pcm_hw_constraint_ratdens_t *r) |
| { |
| return snd_pcm_hw_rule_add(runtime, cond, var, |
| snd_pcm_hw_rule_ratdens, r, |
| var, -1); |
| } |
| |
| static int snd_pcm_hw_rule_msbits(snd_pcm_hw_params_t *params, |
| snd_pcm_hw_rule_t *rule) |
| { |
| unsigned int l = (unsigned long) rule->private; |
| int width = l & 0xffff; |
| unsigned int msbits = l >> 16; |
| snd_interval_t *i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS); |
| if (snd_interval_single(i) && snd_interval_value(i) == width) |
| params->msbits = msbits; |
| return 0; |
| } |
| |
| /** |
| * snd_pcm_hw_constraint_msbits |
| * @runtime: PCM runtime instance |
| * @cond: condition bits |
| * @width: sample bits width |
| * @msbits: msbits width |
| */ |
| int snd_pcm_hw_constraint_msbits(snd_pcm_runtime_t *runtime, |
| unsigned int cond, |
| unsigned int width, |
| unsigned int msbits) |
| { |
| unsigned long l = (msbits << 16) | width; |
| return snd_pcm_hw_rule_add(runtime, cond, -1, |
| snd_pcm_hw_rule_msbits, |
| (void*) l, |
| SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1); |
| } |
| |
| static int snd_pcm_hw_rule_step(snd_pcm_hw_params_t *params, |
| snd_pcm_hw_rule_t *rule) |
| { |
| unsigned long step = (unsigned long) rule->private; |
| return snd_interval_step(hw_param_interval(params, rule->var), 0, step); |
| } |
| |
| /** |
| * snd_pcm_hw_constraint_step |
| * @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(snd_pcm_runtime_t *runtime, |
| unsigned int cond, |
| snd_pcm_hw_param_t var, |
| unsigned long step) |
| { |
| return snd_pcm_hw_rule_add(runtime, cond, var, |
| snd_pcm_hw_rule_step, (void *) step, |
| var, -1); |
| } |
| |
| static int snd_pcm_hw_rule_pow2(snd_pcm_hw_params_t *params, snd_pcm_hw_rule_t *rule) |
| { |
| static int pow2_sizes[] = { |
| 1<<0, 1<<1, 1<<2, 1<<3, 1<<4, 1<<5, 1<<6, 1<<7, |
| 1<<8, 1<<9, 1<<10, 1<<11, 1<<12, 1<<13, 1<<14, 1<<15, |
| 1<<16, 1<<17, 1<<18, 1<<19, 1<<20, 1<<21, 1<<22, 1<<23, |
| 1<<24, 1<<25, 1<<26, 1<<27, 1<<28, 1<<29, 1<<30 |
| }; |
| return snd_interval_list(hw_param_interval(params, rule->var), |
| ARRAY_SIZE(pow2_sizes), pow2_sizes, 0); |
| } |
| |
| /** |
| * snd_pcm_hw_constraint_pow2 |
| * @runtime: PCM runtime instance |
| * @cond: condition bits |
| * @var: hw_params variable to apply the power-of-2 constraint |
| */ |
| int snd_pcm_hw_constraint_pow2(snd_pcm_runtime_t *runtime, |
| unsigned int cond, |
| snd_pcm_hw_param_t var) |
| { |
| return snd_pcm_hw_rule_add(runtime, cond, var, |
| snd_pcm_hw_rule_pow2, NULL, |
| var, -1); |
| } |
| |
| /* To use the same code we have in alsa-lib */ |
| #define snd_pcm_t snd_pcm_substream_t |
| #define assert(i) snd_assert((i), return -EINVAL) |
| #ifndef INT_MIN |
| #define INT_MIN ((int)((unsigned int)INT_MAX+1)) |
| #endif |
| |
| static void _snd_pcm_hw_param_any(snd_pcm_hw_params_t *params, |
| snd_pcm_hw_param_t var) |
| { |
| if (hw_is_mask(var)) { |
| snd_mask_any(hw_param_mask(params, var)); |
| params->cmask |= 1 << var; |
| params->rmask |= 1 << var; |
| return; |
| } |
| if (hw_is_interval(var)) { |
| snd_interval_any(hw_param_interval(params, var)); |
| params->cmask |= 1 << var; |
| params->rmask |= 1 << var; |
| return; |
| } |
| snd_BUG(); |
| } |
| |
| #if 0 |
| /* |
| * snd_pcm_hw_param_any |
| */ |
| int snd_pcm_hw_param_any(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, |
| snd_pcm_hw_param_t var) |
| { |
| _snd_pcm_hw_param_any(params, var); |
| return snd_pcm_hw_refine(pcm, params); |
| } |
| #endif /* 0 */ |
| |
| void _snd_pcm_hw_params_any(snd_pcm_hw_params_t *params) |
| { |
| unsigned int k; |
| memset(params, 0, sizeof(*params)); |
| for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) |
| _snd_pcm_hw_param_any(params, k); |
| for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) |
| _snd_pcm_hw_param_any(params, k); |
| params->info = ~0U; |
| } |
| |
| #if 0 |
| /* |
| * snd_pcm_hw_params_any |
| * |
| * Fill PARAMS with full configuration space boundaries |
| */ |
| int snd_pcm_hw_params_any(snd_pcm_t *pcm, snd_pcm_hw_params_t *params) |
| { |
| _snd_pcm_hw_params_any(params); |
| return snd_pcm_hw_refine(pcm, params); |
| } |
| #endif /* 0 */ |
| |
| /** |
| * snd_pcm_hw_param_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 PAR if it's fixed in configuration space |
| * defined by PARAMS. Return -EINVAL otherwise |
| */ |
| static int snd_pcm_hw_param_value(const snd_pcm_hw_params_t *params, |
| snd_pcm_hw_param_t var, int *dir) |
| { |
| if (hw_is_mask(var)) { |
| const snd_mask_t *mask = hw_param_mask_c(params, var); |
| if (!snd_mask_single(mask)) |
| return -EINVAL; |
| if (dir) |
| *dir = 0; |
| return snd_mask_value(mask); |
| } |
| if (hw_is_interval(var)) { |
| const snd_interval_t *i = hw_param_interval_c(params, var); |
| if (!snd_interval_single(i)) |
| return -EINVAL; |
| if (dir) |
| *dir = i->openmin; |
| return snd_interval_value(i); |
| } |
| assert(0); |
| return -EINVAL; |
| } |
| |
| /** |
| * snd_pcm_hw_param_value_min |
| * @params: the hw_params instance |
| * @var: parameter to retrieve |
| * @dir: pointer to the direction (-1,0,1) or NULL |
| * |
| * Return the minimum value for field PAR. |
| */ |
| unsigned int snd_pcm_hw_param_value_min(const snd_pcm_hw_params_t *params, |
| snd_pcm_hw_param_t var, int *dir) |
| { |
| if (hw_is_mask(var)) { |
| if (dir) |
| *dir = 0; |
| return snd_mask_min(hw_param_mask_c(params, var)); |
| } |
| if (hw_is_interval(var)) { |
| const snd_interval_t *i = hw_param_interval_c(params, var); |
| if (dir) |
| *dir = i->openmin; |
| return snd_interval_min(i); |
| } |
| assert(0); |
| return -EINVAL; |
| } |
| |
| /** |
| * snd_pcm_hw_param_value_max |
| * @params: the hw_params instance |
| * @var: parameter to retrieve |
| * @dir: pointer to the direction (-1,0,1) or NULL |
| * |
| * Return the maximum value for field PAR. |
| */ |
| unsigned int snd_pcm_hw_param_value_max(const snd_pcm_hw_params_t *params, |
| snd_pcm_hw_param_t var, int *dir) |
| { |
| if (hw_is_mask(var)) { |
| if (dir) |
| *dir = 0; |
| return snd_mask_max(hw_param_mask_c(params, var)); |
| } |
| if (hw_is_interval(var)) { |
| const snd_interval_t *i = hw_param_interval_c(params, var); |
| if (dir) |
| *dir = - (int) i->openmax; |
| return snd_interval_max(i); |
| } |
| assert(0); |
| return -EINVAL; |
| } |
| |
| void _snd_pcm_hw_param_setempty(snd_pcm_hw_params_t *params, |
| snd_pcm_hw_param_t var) |
| { |
| if (hw_is_mask(var)) { |
| snd_mask_none(hw_param_mask(params, var)); |
| params->cmask |= 1 << var; |
| params->rmask |= 1 << var; |
| } else if (hw_is_interval(var)) { |
| snd_interval_none(hw_param_interval(params, var)); |
| params->cmask |= 1 << var; |
| params->rmask |= 1 << var; |
| } else { |
| snd_BUG(); |
| } |
| } |
| |
| int _snd_pcm_hw_param_setinteger(snd_pcm_hw_params_t *params, |
| snd_pcm_hw_param_t var) |
| { |
| int changed; |
| assert(hw_is_interval(var)); |
| changed = snd_interval_setinteger(hw_param_interval(params, var)); |
| if (changed) { |
| params->cmask |= 1 << var; |
| params->rmask |= 1 << var; |
| } |
| return changed; |
| } |
| |
| #if 0 |
| /* |
| * snd_pcm_hw_param_setinteger |
| * |
| * Inside configuration space defined by PARAMS remove from PAR all |
| * non integer values. Reduce configuration space accordingly. |
| * Return -EINVAL if the configuration space is empty |
| */ |
| int snd_pcm_hw_param_setinteger(snd_pcm_t *pcm, |
| snd_pcm_hw_params_t *params, |
| snd_pcm_hw_param_t var) |
| { |
| int changed = _snd_pcm_hw_param_setinteger(params, var); |
| if (changed < 0) |
| return changed; |
| if (params->rmask) { |
| int err = snd_pcm_hw_refine(pcm, params); |
| if (err < 0) |
| return err; |
| } |
| return 0; |
| } |
| #endif /* 0 */ |
| |
| static int _snd_pcm_hw_param_first(snd_pcm_hw_params_t *params, |
| snd_pcm_hw_param_t var) |
| { |
| int changed; |
| if (hw_is_mask(var)) |
| changed = snd_mask_refine_first(hw_param_mask(params, var)); |
| else if (hw_is_interval(var)) |
| changed = snd_interval_refine_first(hw_param_interval(params, var)); |
| else { |
| assert(0); |
| return -EINVAL; |
| } |
| if (changed) { |
| params->cmask |= 1 << var; |
| params->rmask |= 1 << var; |
| } |
| return changed; |
| } |
| |
| |
| /** |
| * snd_pcm_hw_param_first |
| * @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 PAR all |
| * values > minimum. Reduce configuration space accordingly. |
| * Return the minimum. |
| */ |
| static int snd_pcm_hw_param_first(snd_pcm_t *pcm, |
| snd_pcm_hw_params_t *params, |
| snd_pcm_hw_param_t var, int *dir) |
| { |
| int changed = _snd_pcm_hw_param_first(params, var); |
| if (changed < 0) |
| return changed; |
| if (params->rmask) { |
| int err = snd_pcm_hw_refine(pcm, params); |
| assert(err >= 0); |
| } |
| return snd_pcm_hw_param_value(params, var, dir); |
| } |
| |
| static int _snd_pcm_hw_param_last(snd_pcm_hw_params_t *params, |
| snd_pcm_hw_param_t var) |
| { |
| int changed; |
| if (hw_is_mask(var)) |
| changed = snd_mask_refine_last(hw_param_mask(params, var)); |
| else if (hw_is_interval(var)) |
| changed = snd_interval_refine_last(hw_param_interval(params, var)); |
| else { |
| assert(0); |
| return -EINVAL; |
| } |
| if (changed) { |
| params->cmask |= 1 << var; |
| params->rmask |= 1 << var; |
| } |
| return changed; |
| } |
| |
| |
| /** |
| * snd_pcm_hw_param_last |
| * @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 PAR all |
| * values < maximum. Reduce configuration space accordingly. |
| * Return the maximum. |
| */ |
| static int snd_pcm_hw_param_last(snd_pcm_t *pcm, |
| snd_pcm_hw_params_t *params, |
| snd_pcm_hw_param_t var, int *dir) |
| { |
| int changed = _snd_pcm_hw_param_last(params, var); |
| if (changed < 0) |
| return changed; |
| if (params->rmask) { |
| int err = snd_pcm_hw_refine(pcm, params); |
| assert(err >= 0); |
| } |
| return snd_pcm_hw_param_value(params, var, dir); |
| } |
| |
| int _snd_pcm_hw_param_min(snd_pcm_hw_params_t *params, |
| snd_pcm_hw_param_t var, unsigned int val, int dir) |
| { |
| int changed; |
| int open = 0; |
| if (dir) { |
| if (dir > 0) { |
| open = 1; |
| } else if (dir < 0) { |
| if (val > 0) { |
| open = 1; |
| val--; |
| } |
| } |
| } |
| if (hw_is_mask(var)) |
| changed = snd_mask_refine_min(hw_param_mask(params, var), val + !!open); |
| else if (hw_is_interval(var)) |
| changed = snd_interval_refine_min(hw_param_interval(params, var), val, open); |
| else { |
| assert(0); |
| return -EINVAL; |
| } |
| if (changed) { |
| params->cmask |= 1 << var; |
| params->rmask |= 1 << var; |
| } |
| return changed; |
| } |
| |
| /** |
| * snd_pcm_hw_param_min |
| * @pcm: PCM instance |
| * @params: the hw_params instance |
| * @var: parameter to retrieve |
| * @val: minimal value |
| * @dir: pointer to the direction (-1,0,1) or NULL |
| * |
| * Inside configuration space defined by PARAMS remove from PAR all |
| * values < VAL. Reduce configuration space accordingly. |
| * Return new minimum or -EINVAL if the configuration space is empty |
| */ |
| static int snd_pcm_hw_param_min(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, |
| snd_pcm_hw_param_t var, unsigned int val, |
| int *dir) |
| { |
| int changed = _snd_pcm_hw_param_min(params, var, val, dir ? *dir : 0); |
| if (changed < 0) |
| return changed; |
| if (params->rmask) { |
| int err = snd_pcm_hw_refine(pcm, params); |
| if (err < 0) |
| return err; |
| } |
| return snd_pcm_hw_param_value_min(params, var, dir); |
| } |
| |
| static int _snd_pcm_hw_param_max(snd_pcm_hw_params_t *params, |
| snd_pcm_hw_param_t var, unsigned int val, |
| int dir) |
| { |
| int changed; |
| int open = 0; |
| if (dir) { |
| if (dir < 0) { |
| open = 1; |
| } else if (dir > 0) { |
| open = 1; |
| val++; |
| } |
| } |
| if (hw_is_mask(var)) { |
| if (val == 0 && open) { |
| snd_mask_none(hw_param_mask(params, var)); |
| changed = -EINVAL; |
| } else |
| changed = snd_mask_refine_max(hw_param_mask(params, var), val - !!open); |
| } else if (hw_is_interval(var)) |
| changed = snd_interval_refine_max(hw_param_interval(params, var), val, open); |
| else { |
| assert(0); |
| return -EINVAL; |
| } |
| if (changed) { |
| params->cmask |= 1 << var; |
| params->rmask |= 1 << var; |
| } |
| return changed; |
| } |
| |
| /** |
| * snd_pcm_hw_param_max |
| * @pcm: PCM instance |
| * @params: the hw_params instance |
| * @var: parameter to retrieve |
| * @val: maximal value |
| * @dir: pointer to the direction (-1,0,1) or NULL |
| * |
| * Inside configuration space defined by PARAMS remove from PAR all |
| * values >= VAL + 1. Reduce configuration space accordingly. |
| * Return new maximum or -EINVAL if the configuration space is empty |
| */ |
| static int snd_pcm_hw_param_max(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, |
| snd_pcm_hw_param_t var, unsigned int val, |
| int *dir) |
| { |
| int changed = _snd_pcm_hw_param_max(params, var, val, dir ? *dir : 0); |
| if (changed < 0) |
| return changed; |
| if (params->rmask) { |
| int err = snd_pcm_hw_refine(pcm, params); |
| if (err < 0) |
| return err; |
| } |
| return snd_pcm_hw_param_value_max(params, var, dir); |
| } |
| |
| int _snd_pcm_hw_param_set(snd_pcm_hw_params_t *params, |
| snd_pcm_hw_param_t var, unsigned int val, int dir) |
| { |
| int changed; |
| if (hw_is_mask(var)) { |
| snd_mask_t *m = hw_param_mask(params, var); |
| if (val == 0 && dir < 0) { |
| changed = -EINVAL; |
| snd_mask_none(m); |
| } else { |
| if (dir > 0) |
| val++; |
| else if (dir < 0) |
| val--; |
| changed = snd_mask_refine_set(hw_param_mask(params, var), val); |
| } |
| } else if (hw_is_interval(var)) { |
| snd_interval_t *i = hw_param_interval(params, var); |
| if (val == 0 && dir < 0) { |
| changed = -EINVAL; |
| snd_interval_none(i); |
| } else if (dir == 0) |
| changed = snd_interval_refine_set(i, val); |
| else { |
| snd_interval_t t; |
| t.openmin = 1; |
| t.openmax = 1; |
| t.empty = 0; |
| t.integer = 0; |
| if (dir < 0) { |
| t.min = val - 1; |
| t.max = val; |
| } else { |
| t.min = val; |
| t.max = val+1; |
| } |
| changed = snd_interval_refine(i, &t); |
| } |
| } else { |
| assert(0); |
| return -EINVAL; |
| } |
| if (changed) { |
| params->cmask |= 1 << var; |
| params->rmask |= 1 << var; |
| } |
| return changed; |
| } |
| |
| /** |
| * snd_pcm_hw_param_set |
| * @pcm: PCM instance |
| * @params: the hw_params instance |
| * @var: parameter to retrieve |
| * @val: value to set |
| * @dir: pointer to the direction (-1,0,1) or NULL |
| * |
| * Inside configuration space defined by PARAMS remove from PAR all |
| * values != VAL. Reduce configuration space accordingly. |
| * Return VAL or -EINVAL if the configuration space is empty |
| */ |
| int snd_pcm_hw_param_set(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, |
| snd_pcm_hw_param_t var, unsigned int val, int dir) |
| { |
| int changed = _snd_pcm_hw_param_set(params, var, val, dir); |
| if (changed < 0) |
| return changed; |
| if (params->rmask) { |
| int err = snd_pcm_hw_refine(pcm, params); |
| if (err < 0) |
| return err; |
| } |
| return snd_pcm_hw_param_value(params, var, NULL); |
| } |
| |
| static int _snd_pcm_hw_param_mask(snd_pcm_hw_params_t *params, |
| snd_pcm_hw_param_t var, const snd_mask_t *val) |
| { |
| int changed; |
| assert(hw_is_mask(var)); |
| changed = snd_mask_refine(hw_param_mask(params, var), val); |
| if (changed) { |
| params->cmask |= 1 << var; |
| params->rmask |= 1 << var; |
| } |
| return changed; |
| } |
| |
| /** |
| * snd_pcm_hw_param_mask |
| * @pcm: PCM instance |
| * @params: the hw_params instance |
| * @var: parameter to retrieve |
| * @val: mask to apply |
| * |
| * Inside configuration space defined by PARAMS remove from PAR all values |
| * not contained in MASK. Reduce configuration space accordingly. |
| * This function can be called only for SNDRV_PCM_HW_PARAM_ACCESS, |
| * SNDRV_PCM_HW_PARAM_FORMAT, SNDRV_PCM_HW_PARAM_SUBFORMAT. |
| * Return 0 on success or -EINVAL |
| * if the configuration space is empty |
| */ |
| int snd_pcm_hw_param_mask(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, |
| snd_pcm_hw_param_t var, const snd_mask_t *val) |
| { |
| int changed = _snd_pcm_hw_param_mask(params, var, val); |
| if (changed < 0) |
| return changed; |
| if (params->rmask) { |
| int err = snd_pcm_hw_refine(pcm, params); |
| if (err < 0) |
| return err; |
| } |
| return 0; |
| } |
| |
| static int boundary_sub(int a, int adir, |
| int b, int bdir, |
| int *c, int *cdir) |
| { |
| adir = adir < 0 ? -1 : (adir > 0 ? 1 : 0); |
| bdir = bdir < 0 ? -1 : (bdir > 0 ? 1 : 0); |
| *c = a - b; |
| *cdir = adir - bdir; |
| if (*cdir == -2) { |
| assert(*c > INT_MIN); |
| (*c)--; |
| } else if (*cdir == 2) { |
| assert(*c < INT_MAX); |
| (*c)++; |
| } |
| return 0; |
| } |
| |
| static int boundary_lt(unsigned int a, int adir, |
| unsigned int b, int bdir) |
| { |
| assert(a > 0 || adir >= 0); |
| assert(b > 0 || bdir >= 0); |
| if (adir < 0) { |
| a--; |
| adir = 1; |
| } else if (adir > 0) |
| adir = 1; |
| if (bdir < 0) { |
| b--; |
| bdir = 1; |
| } else if (bdir > 0) |
| bdir = 1; |
| return a < b || (a == b && adir < bdir); |
| } |
| |
| /* Return 1 if min is nearer to best than max */ |
| static int boundary_nearer(int min, int mindir, |
| int best, int bestdir, |
| int max, int maxdir) |
| { |
| int dmin, dmindir; |
| int dmax, dmaxdir; |
| boundary_sub(best, bestdir, min, mindir, &dmin, &dmindir); |
| boundary_sub(max, maxdir, best, bestdir, &dmax, &dmaxdir); |
| return boundary_lt(dmin, dmindir, dmax, dmaxdir); |
| } |
| |
| /** |
| * snd_pcm_hw_param_near |
| * @pcm: PCM instance |
| * @params: the hw_params instance |
| * @var: parameter to retrieve |
| * @best: value to set |
| * @dir: pointer to the direction (-1,0,1) or NULL |
| * |
| * Inside configuration space defined by PARAMS set PAR to the available value |
| * nearest to VAL. Reduce configuration space accordingly. |
| * This function cannot be called for SNDRV_PCM_HW_PARAM_ACCESS, |
| * SNDRV_PCM_HW_PARAM_FORMAT, SNDRV_PCM_HW_PARAM_SUBFORMAT. |
| * Return the value found. |
| */ |
| int snd_pcm_hw_param_near(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, |
| snd_pcm_hw_param_t var, unsigned int best, int *dir) |
| { |
| snd_pcm_hw_params_t *save = NULL; |
| int v; |
| unsigned int saved_min; |
| int last = 0; |
| int min, max; |
| int mindir, maxdir; |
| int valdir = dir ? *dir : 0; |
| /* FIXME */ |
| if (best > INT_MAX) |
| best = INT_MAX; |
| min = max = best; |
| mindir = maxdir = valdir; |
| if (maxdir > 0) |
| maxdir = 0; |
| else if (maxdir == 0) |
| maxdir = -1; |
| else { |
| maxdir = 1; |
| max--; |
| } |
| save = kmalloc(sizeof(*save), GFP_KERNEL); |
| if (save == NULL) |
| return -ENOMEM; |
| *save = *params; |
| saved_min = min; |
| min = snd_pcm_hw_param_min(pcm, params, var, min, &mindir); |
| if (min >= 0) { |
| snd_pcm_hw_params_t *params1; |
| if (max < 0) |
| goto _end; |
| if ((unsigned int)min == saved_min && mindir == valdir) |
| goto _end; |
| params1 = kmalloc(sizeof(*params1), GFP_KERNEL); |
| if (params1 == NULL) { |
| kfree(save); |
| return -ENOMEM; |
| } |
| *params1 = *save; |
| max = snd_pcm_hw_param_max(pcm, params1, var, max, &maxdir); |
| if (max < 0) { |
| kfree(params1); |
| goto _end; |
| } |
| if (boundary_nearer(max, maxdir, best, valdir, min, mindir)) { |
| *params = *params1; |
| last = 1; |
| } |
| kfree(params1); |
| } else { |
| *params = *save; |
| max = snd_pcm_hw_param_max(pcm, params, var, max, &maxdir); |
| assert(max >= 0); |
| last = 1; |
| } |
| _end: |
| kfree(save); |
| if (last) |
| v = snd_pcm_hw_param_last(pcm, params, var, dir); |
| else |
| v = snd_pcm_hw_param_first(pcm, params, var, dir); |
| assert(v >= 0); |
| return v; |
| } |
| |
| /** |
| * snd_pcm_hw_param_choose |
| * @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(snd_pcm_t *pcm, snd_pcm_hw_params_t *params) |
| { |
| int err; |
| |
| err = snd_pcm_hw_param_first(pcm, params, SNDRV_PCM_HW_PARAM_ACCESS, NULL); |
| assert(err >= 0); |
| |
| err = snd_pcm_hw_param_first(pcm, params, SNDRV_PCM_HW_PARAM_FORMAT, NULL); |
| assert(err >= 0); |
| |
| err = snd_pcm_hw_param_first(pcm, params, SNDRV_PCM_HW_PARAM_SUBFORMAT, NULL); |
| assert(err >= 0); |
| |
| err = snd_pcm_hw_param_first(pcm, params, SNDRV_PCM_HW_PARAM_CHANNELS, NULL); |
| assert(err >= 0); |
| |
| err = snd_pcm_hw_param_first(pcm, params, SNDRV_PCM_HW_PARAM_RATE, NULL); |
| assert(err >= 0); |
| |
| err = snd_pcm_hw_param_first(pcm, params, SNDRV_PCM_HW_PARAM_PERIOD_TIME, NULL); |
| assert(err >= 0); |
| |
| err = snd_pcm_hw_param_last(pcm, params, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, NULL); |
| assert(err >= 0); |
| |
| err = snd_pcm_hw_param_first(pcm, params, SNDRV_PCM_HW_PARAM_TICK_TIME, NULL); |
| assert(err >= 0); |
| |
| return 0; |
| } |
| |
| #undef snd_pcm_t |
| #undef assert |
| |
| static int snd_pcm_lib_ioctl_reset(snd_pcm_substream_t *substream, |
| void *arg) |
| { |
| snd_pcm_runtime_t *runtime = substream->runtime; |
| unsigned long flags; |
| snd_pcm_stream_lock_irqsave(substream, flags); |
| if (snd_pcm_running(substream) && |
| snd_pcm_update_hw_ptr(substream) >= 0) |
| runtime->status->hw_ptr %= runtime->buffer_size; |
| else |
| runtime->status->hw_ptr = 0; |
| snd_pcm_stream_unlock_irqrestore(substream, flags); |
| return 0; |
| } |
| |
| static int snd_pcm_lib_ioctl_channel_info(snd_pcm_substream_t *substream, |
| void *arg) |
| { |
| snd_pcm_channel_info_t *info = arg; |
| snd_pcm_runtime_t *runtime = substream->runtime; |
| int width; |
| if (!(runtime->info & SNDRV_PCM_INFO_MMAP)) { |
| info->offset = -1; |
| return 0; |
| } |
| width = snd_pcm_format_physical_width(runtime->format); |
| if (width < 0) |
| return width; |
| info->offset = 0; |
| switch (runtime->access) { |
| case SNDRV_PCM_ACCESS_MMAP_INTERLEAVED: |
| case SNDRV_PCM_ACCESS_RW_INTERLEAVED: |
| info->first = info->channel * width; |
| info->step = runtime->channels * width; |
| break; |
| case SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED: |
| case SNDRV_PCM_ACCESS_RW_NONINTERLEAVED: |
| { |
| size_t size = runtime->dma_bytes / runtime->channels; |
| info->first = info->channel * size * 8; |
| info->step = width; |
| break; |
| } |
| default: |
| snd_BUG(); |
| break; |
| } |
| return 0; |
| } |
| |
| /** |
| * snd_pcm_lib_ioctl - a generic PCM ioctl callback |
| * @substream: the pcm substream instance |
| * @cmd: ioctl command |
| * @arg: ioctl argument |
| * |
| * Processes the generic ioctl commands for PCM. |
| * Can be passed as the ioctl callback for PCM ops. |
| * |
| * Returns zero if successful, or a negative error code on failure. |
| */ |
| int snd_pcm_lib_ioctl(snd_pcm_substream_t *substream, |
| unsigned int cmd, void *arg) |
| { |
| switch (cmd) { |
| case SNDRV_PCM_IOCTL1_INFO: |
| return 0; |
| case SNDRV_PCM_IOCTL1_RESET: |
| return snd_pcm_lib_ioctl_reset(substream, arg); |
| case SNDRV_PCM_IOCTL1_CHANNEL_INFO: |
| return snd_pcm_lib_ioctl_channel_info(substream, arg); |
| } |
| return -ENXIO; |
| } |
| |
| /* |
| * Conditions |
| */ |
| |
| static void snd_pcm_system_tick_set(snd_pcm_substream_t *substream, |
| unsigned long ticks) |
| { |
| snd_pcm_runtime_t *runtime = substream->runtime; |
| if (ticks == 0) |
| del_timer(&runtime->tick_timer); |
| else { |
| ticks += (1000000 / HZ) - 1; |
| ticks /= (1000000 / HZ); |
| mod_timer(&runtime->tick_timer, jiffies + ticks); |
| } |
| } |
| |
| /* Temporary alias */ |
| void snd_pcm_tick_set(snd_pcm_substream_t *substream, unsigned long ticks) |
| { |
| snd_pcm_system_tick_set(substream, ticks); |
| } |
| |
| void snd_pcm_tick_prepare(snd_pcm_substream_t *substream) |
| { |
| snd_pcm_runtime_t *runtime = substream->runtime; |
| snd_pcm_uframes_t frames = ULONG_MAX; |
| snd_pcm_uframes_t avail, dist; |
| unsigned int ticks; |
| u_int64_t n; |
| u_int32_t r; |
| if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { |
| if (runtime->silence_size >= runtime->boundary) { |
| frames = 1; |
| } else if (runtime->silence_size > 0 && |
| runtime->silence_filled < runtime->buffer_size) { |
| snd_pcm_sframes_t noise_dist; |
| noise_dist = snd_pcm_playback_hw_avail(runtime) + runtime->silence_filled; |
| snd_assert(noise_dist <= (snd_pcm_sframes_t)runtime->silence_threshold, ); |
| frames = noise_dist - runtime->silence_threshold; |
| } |
| avail = snd_pcm_playback_avail(runtime); |
| } else { |
| avail = snd_pcm_capture_avail(runtime); |
| } |
| if (avail < runtime->control->avail_min) { |
| snd_pcm_sframes_t n = runtime->control->avail_min - avail; |
| if (n > 0 && frames > (snd_pcm_uframes_t)n) |
| frames = n; |
| } |
| if (avail < runtime->buffer_size) { |
| snd_pcm_sframes_t n = runtime->buffer_size - avail; |
| if (n > 0 && frames > (snd_pcm_uframes_t)n) |
| frames = n; |
| } |
| if (frames == ULONG_MAX) { |
| snd_pcm_tick_set(substream, 0); |
| return; |
| } |
| dist = runtime->status->hw_ptr - runtime->hw_ptr_base; |
| /* Distance to next interrupt */ |
| dist = runtime->period_size - dist % runtime->period_size; |
| if (dist <= frames) { |
| snd_pcm_tick_set(substream, 0); |
| return; |
| } |
| /* the base time is us */ |
| n = frames; |
| n *= 1000000; |
| div64_32(&n, runtime->tick_time * runtime->rate, &r); |
| ticks = n + (r > 0 ? 1 : 0); |
| if (ticks < runtime->sleep_min) |
| ticks = runtime->sleep_min; |
| snd_pcm_tick_set(substream, (unsigned long) ticks); |
| } |
| |
| void snd_pcm_tick_elapsed(snd_pcm_substream_t *substream) |
| { |
| snd_pcm_runtime_t *runtime; |
| unsigned long flags; |
| |
| snd_assert(substream != NULL, return); |
| runtime = substream->runtime; |
| snd_assert(runtime != NULL, return); |
| |
| snd_pcm_stream_lock_irqsave(substream, flags); |
| if (!snd_pcm_running(substream) || |
| snd_pcm_update_hw_ptr(substream) < 0) |
| goto _end; |
| if (runtime->sleep_min) |
| snd_pcm_tick_prepare(substream); |
| _end: |
| snd_pcm_stream_unlock_irqrestore(substream, flags); |
| } |
| |
| /** |
| * snd_pcm_period_elapsed - update the pcm status for the next period |
| * @substream: the pcm substream instance |
| * |
| * This function is called from the interrupt handler when the |
| * PCM has processed the period size. It will update the current |
| * pointer, set up the tick, wake up sleepers, etc. |
| * |
| * Even if more than one periods have elapsed since the last call, you |
| * have to call this only once. |
| */ |
| void snd_pcm_period_elapsed(snd_pcm_substream_t *substream) |
| { |
| snd_pcm_runtime_t *runtime; |
| unsigned long flags; |
| |
| snd_assert(substream != NULL, return); |
| runtime = substream->runtime; |
| snd_assert(runtime != NULL, return); |
| |
| if (runtime->transfer_ack_begin) |
| runtime->transfer_ack_begin(substream); |
| |
| snd_pcm_stream_lock_irqsave(substream, flags); |
| if (!snd_pcm_running(substream) || |
| snd_pcm_update_hw_ptr_interrupt(substream) < 0) |
| goto _end; |
| |
| if (substream->timer_running) |
| snd_timer_interrupt(substream->timer, 1); |
| if (runtime->sleep_min) |
| snd_pcm_tick_prepare(substream); |
| _end: |
| snd_pcm_stream_unlock_irqrestore(substream, flags); |
| if (runtime->transfer_ack_end) |
| runtime->transfer_ack_end(substream); |
| kill_fasync(&runtime->fasync, SIGIO, POLL_IN); |
| } |
| |
| static int snd_pcm_lib_write_transfer(snd_pcm_substream_t *substream, |
| unsigned int hwoff, |
| unsigned long data, unsigned int off, |
| snd_pcm_uframes_t frames) |
| { |
| snd_pcm_runtime_t *runtime = substream->runtime; |
| int err; |
| char __user *buf = (char __user *) data + frames_to_bytes(runtime, off); |
| if (substream->ops->copy) { |
| if ((err = substream->ops->copy(substream, -1, hwoff, buf, frames)) < 0) |
| return err; |
| } else { |
| char *hwbuf = runtime->dma_area + frames_to_bytes(runtime, hwoff); |
| snd_assert(runtime->dma_area, return -EFAULT); |
| if (copy_from_user(hwbuf, buf, frames_to_bytes(runtime, frames))) |
| return -EFAULT; |
| } |
| return 0; |
| } |
| |
| typedef int (*transfer_f)(snd_pcm_substream_t *substream, unsigned int hwoff, |
| unsigned long data, unsigned int off, |
| snd_pcm_uframes_t size); |
| |
| static snd_pcm_sframes_t snd_pcm_lib_write1(snd_pcm_substream_t *substream, |
| unsigned long data, |
| snd_pcm_uframes_t size, |
| int nonblock, |
| transfer_f transfer) |
| { |
| snd_pcm_runtime_t *runtime = substream->runtime; |
| snd_pcm_uframes_t xfer = 0; |
| snd_pcm_uframes_t offset = 0; |
| int err = 0; |
| |
| if (size == 0) |
| return 0; |
| if (size > runtime->xfer_align) |
| size -= size % runtime->xfer_align; |
| |
| snd_pcm_stream_lock_irq(substream); |
| switch (runtime->status->state) { |
| case SNDRV_PCM_STATE_PREPARED: |
| case SNDRV_PCM_STATE_RUNNING: |
| case SNDRV_PCM_STATE_PAUSED: |
| break; |
| case SNDRV_PCM_STATE_XRUN: |
| err = -EPIPE; |
| goto _end_unlock; |
| case SNDRV_PCM_STATE_SUSPENDED: |
| err = -ESTRPIPE; |
| goto _end_unlock; |
| default: |
| err = -EBADFD; |
| goto _end_unlock; |
| } |
| |
| while (size > 0) { |
| snd_pcm_uframes_t frames, appl_ptr, appl_ofs; |
| snd_pcm_uframes_t avail; |
| snd_pcm_uframes_t cont; |
| if (runtime->sleep_min == 0 && runtime->status->state == SNDRV_PCM_STATE_RUNNING) |
| snd_pcm_update_hw_ptr(substream); |
| avail = snd_pcm_playback_avail(runtime); |
| if (((avail < runtime->control->avail_min && size > avail) || |
| (size >= runtime->xfer_align && avail < runtime->xfer_align))) { |
| wait_queue_t wait; |
| enum { READY, SIGNALED, ERROR, SUSPENDED, EXPIRED, DROPPED } state; |
| long tout; |
| |
| if (nonblock) { |
| err = -EAGAIN; |
| goto _end_unlock; |
| } |
| |
| init_waitqueue_entry(&wait, current); |
| add_wait_queue(&runtime->sleep, &wait); |
| while (1) { |
| if (signal_pending(current)) { |
| state = SIGNALED; |
| break; |
| } |
| set_current_state(TASK_INTERRUPTIBLE); |
| snd_pcm_stream_unlock_irq(substream); |
| tout = schedule_timeout(10 * HZ); |
| snd_pcm_stream_lock_irq(substream); |
| if (tout == 0) { |
| if (runtime->status->state != SNDRV_PCM_STATE_PREPARED && |
| runtime->status->state != SNDRV_PCM_STATE_PAUSED) { |
| state = runtime->status->state == SNDRV_PCM_STATE_SUSPENDED ? SUSPENDED : EXPIRED; |
| break; |
| } |
| } |
| switch (runtime->status->state) { |
| case SNDRV_PCM_STATE_XRUN: |
| case SNDRV_PCM_STATE_DRAINING: |
| state = ERROR; |
| goto _end_loop; |
| case SNDRV_PCM_STATE_SUSPENDED: |
| state = SUSPENDED; |
| goto _end_loop; |
| case SNDRV_PCM_STATE_SETUP: |
| state = DROPPED; |
| goto _end_loop; |
| default: |
| break; |
| } |
| avail = snd_pcm_playback_avail(runtime); |
| if (avail >= runtime->control->avail_min) { |
| state = READY; |
| break; |
| } |
| } |
| _end_loop: |
| remove_wait_queue(&runtime->sleep, &wait); |
| |
| switch (state) { |
| case ERROR: |
| err = -EPIPE; |
| goto _end_unlock; |
| case SUSPENDED: |
| err = -ESTRPIPE; |
| goto _end_unlock; |
| case SIGNALED: |
| err = -ERESTARTSYS; |
| goto _end_unlock; |
| case EXPIRED: |
| snd_printd("playback write error (DMA or IRQ trouble?)\n"); |
| err = -EIO; |
| goto _end_unlock; |
| case DROPPED: |
| err = -EBADFD; |
| goto _end_unlock; |
| default: |
| break; |
| } |
| } |
| if (avail > runtime->xfer_align) |
| avail -= avail % runtime->xfer_align; |
| frames = size > avail ? avail : size; |
| cont = runtime->buffer_size - runtime->control->appl_ptr % runtime->buffer_size; |
| if (frames > cont) |
| frames = cont; |
| snd_assert(frames != 0, snd_pcm_stream_unlock_irq(substream); return -EINVAL); |
| appl_ptr = runtime->control->appl_ptr; |
| appl_ofs = appl_ptr % runtime->buffer_size; |
| snd_pcm_stream_unlock_irq(substream); |
| if ((err = transfer(substream, appl_ofs, data, offset, frames)) < 0) |
| goto _end; |
| snd_pcm_stream_lock_irq(substream); |
| switch (runtime->status->state) { |
| case SNDRV_PCM_STATE_XRUN: |
| err = -EPIPE; |
| goto _end_unlock; |
| case SNDRV_PCM_STATE_SUSPENDED: |
| err = -ESTRPIPE; |
| goto _end_unlock; |
| default: |
| break; |
| } |
| appl_ptr += frames; |
| if (appl_ptr >= runtime->boundary) |
| appl_ptr -= runtime->boundary; |
| runtime->control->appl_ptr = appl_ptr; |
| if (substream->ops->ack) |
| substream->ops->ack(substream); |
| |
| offset += frames; |
| size -= frames; |
| xfer += frames; |
| if (runtime->status->state == SNDRV_PCM_STATE_PREPARED && |
| snd_pcm_playback_hw_avail(runtime) >= (snd_pcm_sframes_t)runtime->start_threshold) { |
| err = snd_pcm_start(substream); |
| if (err < 0) |
| goto _end_unlock; |
| } |
| if (runtime->sleep_min && |
| runtime->status->state == SNDRV_PCM_STATE_RUNNING) |
| snd_pcm_tick_prepare(substream); |
| } |
| _end_unlock: |
| snd_pcm_stream_unlock_irq(substream); |
| _end: |
| return xfer > 0 ? (snd_pcm_sframes_t)xfer : err; |
| } |
| |
| snd_pcm_sframes_t snd_pcm_lib_write(snd_pcm_substream_t *substream, const void __user *buf, snd_pcm_uframes_t size) |
| { |
| snd_pcm_runtime_t *runtime; |
| int nonblock; |
| |
| snd_assert(substream != NULL, return -ENXIO); |
| runtime = substream->runtime; |
| snd_assert(runtime != NULL, return -ENXIO); |
| snd_assert(substream->ops->copy != NULL || runtime->dma_area != NULL, return -EINVAL); |
| if (runtime->status->state == SNDRV_PCM_STATE_OPEN) |
| return -EBADFD; |
| |
| snd_assert(substream->ffile != NULL, return -ENXIO); |
| nonblock = !!(substream->ffile->f_flags & O_NONBLOCK); |
| #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE) |
| if (substream->oss.oss) { |
| snd_pcm_oss_setup_t *setup = substream->oss.setup; |
| if (setup != NULL) { |
| if (setup->nonblock) |
| nonblock = 1; |
| else if (setup->block) |
| nonblock = 0; |
| } |
| } |
| #endif |
| |
| if (runtime->access != SNDRV_PCM_ACCESS_RW_INTERLEAVED && |
| runtime->channels > 1) |
| return -EINVAL; |
| return snd_pcm_lib_write1(substream, (unsigned long)buf, size, nonblock, |
| snd_pcm_lib_write_transfer); |
| } |
| |
| static int snd_pcm_lib_writev_transfer(snd_pcm_substream_t *substream, |
| unsigned int hwoff, |
| unsigned long data, unsigned int off, |
| snd_pcm_uframes_t frames) |
| { |
| snd_pcm_runtime_t *runtime = substream->runtime; |
| int err; |
| void __user **bufs = (void __user **)data; |
| int channels = runtime->channels; |
| int c; |
| if (substream->ops->copy) { |
| snd_assert(substream->ops->silence != NULL, return -EINVAL); |
| for (c = 0; c < channels; ++c, ++bufs) { |
| if (*bufs == NULL) { |
| if ((err = substream->ops->silence(substream, c, hwoff, frames)) < 0) |
| return err; |
| } else { |
| char __user *buf = *bufs + samples_to_bytes(runtime, off); |
| if ((err = substream->ops->copy(substream, c, hwoff, buf, frames)) < 0) |
| return err; |
| } |
| } |
| } else { |
| /* default transfer behaviour */ |
| size_t dma_csize = runtime->dma_bytes / channels; |
| snd_assert(runtime->dma_area, return -EFAULT); |
| for (c = 0; c < channels; ++c, ++bufs) { |
| char *hwbuf = runtime->dma_area + (c * dma_csize) + samples_to_bytes(runtime, hwoff); |
| if (*bufs == NULL) { |
| snd_pcm_format_set_silence(runtime->format, hwbuf, frames); |
| } else { |
| char __user *buf = *bufs + samples_to_bytes(runtime, off); |
| if (copy_from_user(hwbuf, buf, samples_to_bytes(runtime, frames))) |
| return -EFAULT; |
| } |
| } |
| } |
| return 0; |
| } |
| |
| snd_pcm_sframes_t snd_pcm_lib_writev(snd_pcm_substream_t *substream, |
| void __user **bufs, |
| snd_pcm_uframes_t frames) |
| { |
| snd_pcm_runtime_t *runtime; |
| int nonblock; |
| |
| snd_assert(substream != NULL, return -ENXIO); |
| runtime = substream->runtime; |
| snd_assert(runtime != NULL, return -ENXIO); |
| snd_assert(substream->ops->copy != NULL || runtime->dma_area != NULL, return -EINVAL); |
| if (runtime->status->state == SNDRV_PCM_STATE_OPEN) |
| return -EBADFD; |
| |
| snd_assert(substream->ffile != NULL, return -ENXIO); |
| nonblock = !!(substream->ffile->f_flags & O_NONBLOCK); |
| #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE) |
| if (substream->oss.oss) { |
| snd_pcm_oss_setup_t *setup = substream->oss.setup; |
| if (setup != NULL) { |
| if (setup->nonblock) |
| nonblock = 1; |
| else if (setup->block) |
| nonblock = 0; |
| } |
| } |
| #endif |
| |
| if (runtime->access != SNDRV_PCM_ACCESS_RW_NONINTERLEAVED) |
| return -EINVAL; |
| return snd_pcm_lib_write1(substream, (unsigned long)bufs, frames, |
| nonblock, snd_pcm_lib_writev_transfer); |
| } |
| |
| static int snd_pcm_lib_read_transfer(snd_pcm_substream_t *substream, |
| unsigned int hwoff, |
| unsigned long data, unsigned int off, |
| snd_pcm_uframes_t frames) |
| { |
| snd_pcm_runtime_t *runtime = substream->runtime; |
| int err; |
| char __user *buf = (char __user *) data + frames_to_bytes(runtime, off); |
| if (substream->ops->copy) { |
| if ((err = substream->ops->copy(substream, -1, hwoff, buf, frames)) < 0) |
| return err; |
| } else { |
| char *hwbuf = runtime->dma_area + frames_to_bytes(runtime, hwoff); |
| snd_assert(runtime->dma_area, return -EFAULT); |
| if (copy_to_user(buf, hwbuf, frames_to_bytes(runtime, frames))) |
| return -EFAULT; |
| } |
| return 0; |
| } |
| |
| static snd_pcm_sframes_t snd_pcm_lib_read1(snd_pcm_substream_t *substream, |
| unsigned long data, |
| snd_pcm_uframes_t size, |
| int nonblock, |
| transfer_f transfer) |
| { |
| snd_pcm_runtime_t *runtime = substream->runtime; |
| snd_pcm_uframes_t xfer = 0; |
| snd_pcm_uframes_t offset = 0; |
| int err = 0; |
| |
| if (size == 0) |
| return 0; |
| if (size > runtime->xfer_align) |
| size -= size % runtime->xfer_align; |
| |
| snd_pcm_stream_lock_irq(substream); |
| switch (runtime->status->state) { |
| case SNDRV_PCM_STATE_PREPARED: |
| if (size >= runtime->start_threshold) { |
| err = snd_pcm_start(substream); |
| if (err < 0) |
| goto _end_unlock; |
| } |
| break; |
| case SNDRV_PCM_STATE_DRAINING: |
| case SNDRV_PCM_STATE_RUNNING: |
| case SNDRV_PCM_STATE_PAUSED: |
| break; |
| case SNDRV_PCM_STATE_XRUN: |
| err = -EPIPE; |
| goto _end_unlock; |
| case SNDRV_PCM_STATE_SUSPENDED: |
| err = -ESTRPIPE; |
| goto _end_unlock; |
| default: |
| err = -EBADFD; |
| goto _end_unlock; |
| } |
| |
| while (size > 0) { |
| snd_pcm_uframes_t frames, appl_ptr, appl_ofs; |
| snd_pcm_uframes_t avail; |
| snd_pcm_uframes_t cont; |
| if (runtime->sleep_min == 0 && runtime->status->state == SNDRV_PCM_STATE_RUNNING) |
| snd_pcm_update_hw_ptr(substream); |
| __draining: |
| avail = snd_pcm_capture_avail(runtime); |
| if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) { |
| if (avail < runtime->xfer_align) { |
| err = -EPIPE; |
| goto _end_unlock; |
| } |
| } else if ((avail < runtime->control->avail_min && size > avail) || |
| (size >= runtime->xfer_align && avail < runtime->xfer_align)) { |
| wait_queue_t wait; |
| enum { READY, SIGNALED, ERROR, SUSPENDED, EXPIRED, DROPPED } state; |
| long tout; |
| |
| if (nonblock) { |
| err = -EAGAIN; |
| goto _end_unlock; |
| } |
| |
| init_waitqueue_entry(&wait, current); |
| add_wait_queue(&runtime->sleep, &wait); |
| while (1) { |
| if (signal_pending(current)) { |
| state = SIGNALED; |
| break; |
| } |
| set_current_state(TASK_INTERRUPTIBLE); |
| snd_pcm_stream_unlock_irq(substream); |
| tout = schedule_timeout(10 * HZ); |
| snd_pcm_stream_lock_irq(substream); |
| if (tout == 0) { |
| if (runtime->status->state != SNDRV_PCM_STATE_PREPARED && |
| runtime->status->state != SNDRV_PCM_STATE_PAUSED) { |
| state = runtime->status->state == SNDRV_PCM_STATE_SUSPENDED ? SUSPENDED : EXPIRED; |
| break; |
| } |
| } |
| switch (runtime->status->state) { |
| case SNDRV_PCM_STATE_XRUN: |
| state = ERROR; |
| goto _end_loop; |
| case SNDRV_PCM_STATE_SUSPENDED: |
| state = SUSPENDED; |
| goto _end_loop; |
| case SNDRV_PCM_STATE_DRAINING: |
| goto __draining; |
| case SNDRV_PCM_STATE_SETUP: |
| state = DROPPED; |
| goto _end_loop; |
| default: |
| break; |
| } |
| avail = snd_pcm_capture_avail(runtime); |
| if (avail >= runtime->control->avail_min) { |
| state = READY; |
| break; |
| } |
| } |
| _end_loop: |
| remove_wait_queue(&runtime->sleep, &wait); |
| |
| switch (state) { |
| case ERROR: |
| err = -EPIPE; |
| goto _end_unlock; |
| case SUSPENDED: |
| err = -ESTRPIPE; |
| goto _end_unlock; |
| case SIGNALED: |
| err = -ERESTARTSYS; |
| goto _end_unlock; |
| case EXPIRED: |
| snd_printd("capture read error (DMA or IRQ trouble?)\n"); |
| err = -EIO; |
| goto _end_unlock; |
| case DROPPED: |
| err = -EBADFD; |
| goto _end_unlock; |
| default: |
| break; |
| } |
| } |
| if (avail > runtime->xfer_align) |
| avail -= avail % runtime->xfer_align; |
| frames = size > avail ? avail : size; |
| cont = runtime->buffer_size - runtime->control->appl_ptr % runtime->buffer_size; |
| if (frames > cont) |
| frames = cont; |
| snd_assert(frames != 0, snd_pcm_stream_unlock_irq(substream); return -EINVAL); |
| appl_ptr = runtime->control->appl_ptr; |
| appl_ofs = appl_ptr % runtime->buffer_size; |
| snd_pcm_stream_unlock_irq(substream); |
| if ((err = transfer(substream, appl_ofs, data, offset, frames)) < 0) |
| goto _end; |
| snd_pcm_stream_lock_irq(substream); |
| switch (runtime->status->state) { |
| case SNDRV_PCM_STATE_XRUN: |
| err = -EPIPE; |
| goto _end_unlock; |
| case SNDRV_PCM_STATE_SUSPENDED: |
| err = -ESTRPIPE; |
| goto _end_unlock; |
| default: |
| break; |
| } |
| appl_ptr += frames; |
| if (appl_ptr >= runtime->boundary) |
| appl_ptr -= runtime->boundary; |
| runtime->control->appl_ptr = appl_ptr; |
| if (substream->ops->ack) |
| substream->ops->ack(substream); |
| |
| offset += frames; |
| size -= frames; |
| xfer += frames; |
| if (runtime->sleep_min && |
| runtime->status->state == SNDRV_PCM_STATE_RUNNING) |
| snd_pcm_tick_prepare(substream); |
| } |
| _end_unlock: |
| snd_pcm_stream_unlock_irq(substream); |
| _end: |
| return xfer > 0 ? (snd_pcm_sframes_t)xfer : err; |
| } |
| |
| snd_pcm_sframes_t snd_pcm_lib_read(snd_pcm_substream_t *substream, void __user *buf, snd_pcm_uframes_t size) |
| { |
| snd_pcm_runtime_t *runtime; |
| int nonblock; |
| |
| snd_assert(substream != NULL, return -ENXIO); |
| runtime = substream->runtime; |
| snd_assert(runtime != NULL, return -ENXIO); |
| snd_assert(substream->ops->copy != NULL || runtime->dma_area != NULL, return -EINVAL); |
| if (runtime->status->state == SNDRV_PCM_STATE_OPEN) |
| return -EBADFD; |
| |
| snd_assert(substream->ffile != NULL, return -ENXIO); |
| nonblock = !!(substream->ffile->f_flags & O_NONBLOCK); |
| #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE) |
| if (substream->oss.oss) { |
| snd_pcm_oss_setup_t *setup = substream->oss.setup; |
| if (setup != NULL) { |
| if (setup->nonblock) |
| nonblock = 1; |
| else if (setup->block) |
| nonblock = 0; |
| } |
| } |
| #endif |
| if (runtime->access != SNDRV_PCM_ACCESS_RW_INTERLEAVED) |
| return -EINVAL; |
| return snd_pcm_lib_read1(substream, (unsigned long)buf, size, nonblock, snd_pcm_lib_read_transfer); |
| } |
| |
| static int snd_pcm_lib_readv_transfer(snd_pcm_substream_t *substream, |
| unsigned int hwoff, |
| unsigned long data, unsigned int off, |
| snd_pcm_uframes_t frames) |
| { |
| snd_pcm_runtime_t *runtime = substream->runtime; |
| int err; |
| void __user **bufs = (void __user **)data; |
| int channels = runtime->channels; |
| int c; |
| if (substream->ops->copy) { |
| for (c = 0; c < channels; ++c, ++bufs) { |
| char __user *buf; |
| if (*bufs == NULL) |
| continue; |
| buf = *bufs + samples_to_bytes(runtime, off); |
| if ((err = substream->ops->copy(substream, c, hwoff, buf, frames)) < 0) |
| return err; |
| } |
| } else { |
| snd_pcm_uframes_t dma_csize = runtime->dma_bytes / channels; |
| snd_assert(runtime->dma_area, return -EFAULT); |
| for (c = 0; c < channels; ++c, ++bufs) { |
| char *hwbuf; |
| char __user *buf; |
| if (*bufs == NULL) |
| continue; |
| |
| hwbuf = runtime->dma_area + (c * dma_csize) + samples_to_bytes(runtime, hwoff); |
| buf = *bufs + samples_to_bytes(runtime, off); |
| if (copy_to_user(buf, hwbuf, samples_to_bytes(runtime, frames))) |
| return -EFAULT; |
| } |
| } |
| return 0; |
| } |
| |
| snd_pcm_sframes_t snd_pcm_lib_readv(snd_pcm_substream_t *substream, |
| void __user **bufs, |
| snd_pcm_uframes_t frames) |
| { |
| snd_pcm_runtime_t *runtime; |
| int nonblock; |
| |
| snd_assert(substream != NULL, return -ENXIO); |
| runtime = substream->runtime; |
| snd_assert(runtime != NULL, return -ENXIO); |
| snd_assert(substream->ops->copy != NULL || runtime->dma_area != NULL, return -EINVAL); |
| if (runtime->status->state == SNDRV_PCM_STATE_OPEN) |
| return -EBADFD; |
| |
| snd_assert(substream->ffile != NULL, return -ENXIO); |
| nonblock = !!(substream->ffile->f_flags & O_NONBLOCK); |
| #if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE) |
| if (substream->oss.oss) { |
| snd_pcm_oss_setup_t *setup = substream->oss.setup; |
| if (setup != NULL) { |
| if (setup->nonblock) |
| nonblock = 1; |
| else if (setup->block) |
| nonblock = 0; |
| } |
| } |
| #endif |
| |
| if (runtime->access != SNDRV_PCM_ACCESS_RW_NONINTERLEAVED) |
| return -EINVAL; |
| return snd_pcm_lib_read1(substream, (unsigned long)bufs, frames, nonblock, snd_pcm_lib_readv_transfer); |
| } |
| |
| /* |
| * Exported symbols |
| */ |
| |
| EXPORT_SYMBOL(snd_interval_refine); |
| EXPORT_SYMBOL(snd_interval_list); |
| EXPORT_SYMBOL(snd_interval_ratnum); |
| EXPORT_SYMBOL(_snd_pcm_hw_params_any); |
| EXPORT_SYMBOL(_snd_pcm_hw_param_min); |
| EXPORT_SYMBOL(_snd_pcm_hw_param_set); |
| EXPORT_SYMBOL(_snd_pcm_hw_param_setempty); |
| EXPORT_SYMBOL(_snd_pcm_hw_param_setinteger); |
| EXPORT_SYMBOL(snd_pcm_hw_param_value_min); |
| EXPORT_SYMBOL(snd_pcm_hw_param_value_max); |
| EXPORT_SYMBOL(snd_pcm_hw_param_mask); |
| EXPORT_SYMBOL(snd_pcm_hw_param_first); |
| EXPORT_SYMBOL(snd_pcm_hw_param_last); |
| EXPORT_SYMBOL(snd_pcm_hw_param_near); |
| EXPORT_SYMBOL(snd_pcm_hw_param_set); |
| EXPORT_SYMBOL(snd_pcm_hw_refine); |
| EXPORT_SYMBOL(snd_pcm_hw_constraints_init); |
| EXPORT_SYMBOL(snd_pcm_hw_constraints_complete); |
| EXPORT_SYMBOL(snd_pcm_hw_constraint_list); |
| EXPORT_SYMBOL(snd_pcm_hw_constraint_step); |
| EXPORT_SYMBOL(snd_pcm_hw_constraint_ratnums); |
| EXPORT_SYMBOL(snd_pcm_hw_constraint_ratdens); |
| EXPORT_SYMBOL(snd_pcm_hw_constraint_msbits); |
| EXPORT_SYMBOL(snd_pcm_hw_constraint_minmax); |
| EXPORT_SYMBOL(snd_pcm_hw_constraint_integer); |
| EXPORT_SYMBOL(snd_pcm_hw_constraint_pow2); |
| EXPORT_SYMBOL(snd_pcm_hw_rule_add); |
| EXPORT_SYMBOL(snd_pcm_set_ops); |
| EXPORT_SYMBOL(snd_pcm_set_sync); |
| EXPORT_SYMBOL(snd_pcm_lib_ioctl); |
| EXPORT_SYMBOL(snd_pcm_stop); |
| EXPORT_SYMBOL(snd_pcm_period_elapsed); |
| EXPORT_SYMBOL(snd_pcm_lib_write); |
| EXPORT_SYMBOL(snd_pcm_lib_read); |
| EXPORT_SYMBOL(snd_pcm_lib_writev); |
| EXPORT_SYMBOL(snd_pcm_lib_readv); |
| EXPORT_SYMBOL(snd_pcm_lib_buffer_bytes); |
| EXPORT_SYMBOL(snd_pcm_lib_period_bytes); |
| /* pcm_memory.c */ |
| EXPORT_SYMBOL(snd_pcm_lib_preallocate_free_for_all); |
| EXPORT_SYMBOL(snd_pcm_lib_preallocate_pages); |
| EXPORT_SYMBOL(snd_pcm_lib_preallocate_pages_for_all); |
| EXPORT_SYMBOL(snd_pcm_sgbuf_ops_page); |
| EXPORT_SYMBOL(snd_pcm_lib_malloc_pages); |
| EXPORT_SYMBOL(snd_pcm_lib_free_pages); |