diff options
Diffstat (limited to 'sound/core/pcm_lib.c')
| -rw-r--r-- | sound/core/pcm_lib.c | 2612 |
1 files changed, 2612 insertions, 0 deletions
diff --git a/sound/core/pcm_lib.c b/sound/core/pcm_lib.c new file mode 100644 index 00000000000..151fd99ca2c --- /dev/null +++ b/sound/core/pcm_lib.c @@ -0,0 +1,2612 @@ +/* + * Digital Audio (PCM) abstract layer + * Copyright (c) by Jaroslav Kysela <perex@suse.cz> + * Abramo Bagnara <abramo@alsa-project.org> + * + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + * + */ + +#include <sound/driver.h> +#include <linux/slab.h> +#include <linux/time.h> +#include <sound/core.h> +#include <sound/control.h> +#include <sound/info.h> +#include <sound/pcm.h> +#include <sound/pcm_params.h> +#include <sound/timer.h> + +/* + * fill ring buffer with silence + * runtime->silence_start: starting pointer to silence area + * runtime->silence_filled: size filled with silence + * runtime->silence_threshold: threshold from application + * runtime->silence_size: maximal size from application + * + * when runtime->silence_size >= runtime->boundary - fill processed area with silence immediately + */ +void snd_pcm_playback_silence(snd_pcm_substream_t *substream, snd_pcm_uframes_t new_hw_ptr) +{ + snd_pcm_runtime_t *runtime = substream->runtime; + snd_pcm_uframes_t frames, ofs, transfer; + + if (runtime->silence_size < runtime->boundary) { + snd_pcm_sframes_t noise_dist, n; + if (runtime->silence_start != runtime->control->appl_ptr) { + n = runtime->control->appl_ptr - runtime->silence_start; + if (n < 0) + n += runtime->boundary; + if ((snd_pcm_uframes_t)n < runtime->silence_filled) + runtime->silence_filled -= n; + else + runtime->silence_filled = 0; + runtime->silence_start = runtime->control->appl_ptr; + } + if (runtime->silence_filled == runtime->buffer_size) + return; + snd_assert(runtime->silence_filled <= runtime->buffer_size, return); + noise_dist = snd_pcm_playback_hw_avail(runtime) + runtime->silence_filled; + if (noise_dist >= (snd_pcm_sframes_t) runtime->silence_threshold) + return; + frames = runtime->silence_threshold - noise_dist; + if (frames > runtime->silence_size) + frames = runtime->silence_size; + } else { + if (new_hw_ptr == ULONG_MAX) { /* initialization */ + snd_pcm_sframes_t avail = snd_pcm_playback_hw_avail(runtime); + runtime->silence_filled = avail > 0 ? avail : 0; + runtime->silence_start = (runtime->status->hw_ptr + + runtime->silence_filled) % + runtime->boundary; + } else { + ofs = runtime->status->hw_ptr; + frames = new_hw_ptr - ofs; + if ((snd_pcm_sframes_t)frames < 0) + frames += runtime->boundary; + runtime->silence_filled -= frames; + if ((snd_pcm_sframes_t)runtime->silence_filled < 0) { + runtime->silence_filled = 0; + runtime->silence_start = (ofs + frames) - runtime->buffer_size; + } else { + runtime->silence_start = ofs - runtime->silence_filled; + } + if ((snd_pcm_sframes_t)runtime->silence_start < 0) + runtime->silence_start += runtime->boundary; + } + frames = runtime->buffer_size - runtime->silence_filled; + } + snd_assert(frames <= runtime->buffer_size, return); + if (frames == 0) + return; + ofs = (runtime->silence_start + runtime->silence_filled) % runtime->buffer_size; + while (frames > 0) { + transfer = ofs + frames > runtime->buffer_size ? runtime->buffer_size - ofs : frames; + if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED || + runtime->access == SNDRV_PCM_ACCESS_MMAP_INTERLEAVED) { + if (substream->ops->silence) { + int err; + err = substream->ops->silence(substream, -1, ofs, transfer); + snd_assert(err >= 0, ); + } else { + char *hwbuf = runtime->dma_area + frames_to_bytes(runtime, ofs); + snd_pcm_format_set_silence(runtime->format, hwbuf, transfer * runtime->channels); + } + } else { + unsigned int c; + unsigned int channels = runtime->channels; + if (substream->ops->silence) { + for (c = 0; c < channels; ++c) { + int err; + err = substream->ops->silence(substream, c, ofs, transfer); + snd_assert(err >= 0, ); + } + } else { + size_t dma_csize = runtime->dma_bytes / channels; + for (c = 0; c < channels; ++c) { + char *hwbuf = runtime->dma_area + (c * dma_csize) + samples_to_bytes(runtime, ofs); + snd_pcm_format_set_silence(runtime->format, hwbuf, transfer); + } + } + } + runtime->silence_filled += transfer; + frames -= transfer; + ofs = 0; + } +} + +static void xrun(snd_pcm_substream_t *substream) +{ + snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN); +#ifdef CONFIG_SND_DEBUG + if (substream->pstr->xrun_debug) { + snd_printd(KERN_DEBUG "XRUN: pcmC%dD%d%c\n", + substream->pcm->card->number, + substream->pcm->device, + substream->stream ? 'c' : 'p'); + if (substream->pstr->xrun_debug > 1) + dump_stack(); + } +#endif +} + +static inline snd_pcm_uframes_t snd_pcm_update_hw_ptr_pos(snd_pcm_substream_t *substream, + snd_pcm_runtime_t *runtime) +{ + snd_pcm_uframes_t pos; + + pos = substream->ops->pointer(substream); + if (pos == SNDRV_PCM_POS_XRUN) + return pos; /* XRUN */ + if (runtime->tstamp_mode & SNDRV_PCM_TSTAMP_MMAP) + snd_timestamp_now((snd_timestamp_t*)&runtime->status->tstamp, runtime->tstamp_timespec); +#ifdef CONFIG_SND_DEBUG + if (pos >= runtime->buffer_size) { + snd_printk(KERN_ERR "BUG: stream = %i, pos = 0x%lx, buffer size = 0x%lx, period size = 0x%lx\n", substream->stream, pos, runtime->buffer_size, runtime->period_size); + } else +#endif + snd_runtime_check(pos < runtime->buffer_size, return 0); + pos -= pos % runtime->min_align; + return pos; +} + +static inline int snd_pcm_update_hw_ptr_post(snd_pcm_substream_t *substream, + snd_pcm_runtime_t *runtime) +{ + snd_pcm_uframes_t avail; + + if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) + avail = snd_pcm_playback_avail(runtime); + else + avail = snd_pcm_capture_avail(runtime); + if (avail > runtime->avail_max) + runtime->avail_max = avail; + if (avail >= runtime->stop_threshold) { + if (substream->runtime->status->state == SNDRV_PCM_STATE_DRAINING) + snd_pcm_drain_done(substream); + else + xrun(substream); + return -EPIPE; + } + if (avail >= runtime->control->avail_min) + wake_up(&runtime->sleep); + return 0; +} + +static inline int snd_pcm_update_hw_ptr_interrupt(snd_pcm_substream_t *substream) +{ + snd_pcm_runtime_t *runtime = substream->runtime; + snd_pcm_uframes_t pos; + snd_pcm_uframes_t new_hw_ptr, hw_ptr_interrupt; + snd_pcm_sframes_t delta; + + pos = snd_pcm_update_hw_ptr_pos(substream, runtime); + if (pos == SNDRV_PCM_POS_XRUN) { + xrun(substream); + return -EPIPE; + } + if (runtime->period_size == runtime->buffer_size) + goto __next_buf; + new_hw_ptr = runtime->hw_ptr_base + pos; + hw_ptr_interrupt = runtime->hw_ptr_interrupt + runtime->period_size; + + delta = hw_ptr_interrupt - new_hw_ptr; + if (delta > 0) { + if ((snd_pcm_uframes_t)delta < runtime->buffer_size / 2) { +#ifdef CONFIG_SND_DEBUG + if (runtime->periods > 1 && substream->pstr->xrun_debug) { + snd_printd(KERN_ERR "Unexpected hw_pointer value [1] (stream = %i, delta: -%ld, max jitter = %ld): wrong interrupt acknowledge?\n", substream->stream, (long) delta, runtime->buffer_size / 2); + if (substream->pstr->xrun_debug > 1) + dump_stack(); + } +#endif + return 0; + } + __next_buf: + runtime->hw_ptr_base += runtime->buffer_size; + if (runtime->hw_ptr_base == runtime->boundary) + runtime->hw_ptr_base = 0; + new_hw_ptr = runtime->hw_ptr_base + pos; + } + + if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && + runtime->silence_size > 0) + snd_pcm_playback_silence(substream, new_hw_ptr); + + runtime->status->hw_ptr = new_hw_ptr; + runtime->hw_ptr_interrupt = new_hw_ptr - new_hw_ptr % runtime->period_size; + + return snd_pcm_update_hw_ptr_post(substream, runtime); +} + +/* CAUTION: call it with irq disabled */ +int snd_pcm_update_hw_ptr(snd_pcm_substream_t *substream) +{ + snd_pcm_runtime_t *runtime = substream->runtime; + snd_pcm_uframes_t pos; + snd_pcm_uframes_t old_hw_ptr, new_hw_ptr; + snd_pcm_sframes_t delta; + + old_hw_ptr = runtime->status->hw_ptr; + pos = snd_pcm_update_hw_ptr_pos(substream, runtime); + if (pos == SNDRV_PCM_POS_XRUN) { + xrun(substream); + return -EPIPE; + } + new_hw_ptr = runtime->hw_ptr_base + pos; + + delta = old_hw_ptr - new_hw_ptr; + if (delta > 0) { + if ((snd_pcm_uframes_t)delta < runtime->buffer_size / 2) { +#ifdef CONFIG_SND_DEBUG + if (runtime->periods > 2 && substream->pstr->xrun_debug) { + snd_printd(KERN_ERR "Unexpected hw_pointer value [2] (stream = %i, delta: -%ld, max jitter = %ld): wrong interrupt acknowledge?\n", substream->stream, (long) delta, runtime->buffer_size / 2); + if (substream->pstr->xrun_debug > 1) + dump_stack(); + } +#endif + return 0; + } + runtime->hw_ptr_base += runtime->buffer_size; + if (runtime->hw_ptr_base == runtime->boundary) + runtime->hw_ptr_base = 0; + new_hw_ptr = runtime->hw_ptr_base + pos; + } + if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK && + runtime->silence_size > 0) + snd_pcm_playback_silence(substream, new_hw_ptr); + + runtime->status->hw_ptr = new_hw_ptr; + + return snd_pcm_update_hw_ptr_post(substream, runtime); +} + +/** + * snd_pcm_set_ops - set the PCM operators + * @pcm: the pcm instance + * @direction: stream direction, SNDRV_PCM_STREAM_XXX + * @ops: the operator table + * + * Sets the given PCM operators to the pcm instance. + */ +void snd_pcm_set_ops(snd_pcm_t *pcm, int direction, snd_pcm_ops_t *ops) +{ + snd_pcm_str_t *stream = &pcm->streams[direction]; + snd_pcm_substream_t *substream; + + for (substream = stream->substream; substream != NULL; substream = substream->next) + substream->ops = ops; +} + + +/** + * snd_pcm_sync - set the PCM sync id + * @substream: the pcm substream + * + * Sets the PCM sync identifier for the card. + */ +void snd_pcm_set_sync(snd_pcm_substream_t * substream) +{ + snd_pcm_runtime_t *runtime = substream->runtime; + + runtime->sync.id32[0] = substream->pcm->card->number; + runtime->sync.id32[1] = -1; + runtime->sync.id32[2] = -1; + runtime->sync.id32[3] = -1; +} + +/* + * Standard ioctl routine + */ + +/* Code taken from alsa-lib */ +#define assert(a) snd_assert((a), return -EINVAL) + +static inline unsigned int div32(unsigned int a, unsigned int b, + unsigned int *r) +{ + if (b == 0) { + *r = 0; + return UINT_MAX; + } + *r = a % b; + return a / b; +} + +static inline unsigned int div_down(unsigned int a, unsigned int b) +{ + if (b == 0) + return UINT_MAX; + return a / b; +} + +static inline unsigned int div_up(unsigned int a, unsigned int b) +{ + unsigned int r; + unsigned int q; + if (b == 0) + return UINT_MAX; + q = div32(a, b, &r); + if (r) + ++q; + return q; +} + +static inline unsigned int mul(unsigned int a, unsigned int b) +{ + if (a == 0) + return 0; + if (div_down(UINT_MAX, a) < b) + return UINT_MAX; + return a * b; +} + +static inline unsigned int muldiv32(unsigned int a, unsigned int b, + unsigned int c, unsigned int *r) +{ + u_int64_t n = (u_int64_t) a * b; + if (c == 0) { + snd_assert(n > 0, ); + *r = 0; + return UINT_MAX; + } + div64_32(&n, c, r); + if (n >= UINT_MAX) { + *r = 0; + return UINT_MAX; + } + return n; +} + +static int snd_interval_refine_min(snd_interval_t *i, unsigned int min, int openmin) +{ + int changed = 0; + assert(!snd_interval_empty(i)); + if (i->min < min) { + i->min = min; + i->openmin = openmin; + changed = 1; + } else if (i->min == min && !i->openmin && openmin) { + i->openmin = 1; + changed = 1; + } + if (i->integer) { + if (i->openmin) { + i->min++; + i->openmin = 0; + } + } + if (snd_interval_checkempty(i)) { + snd_interval_none(i); + return -EINVAL; + } + return changed; +} + +static int snd_interval_refine_max(snd_interval_t *i, unsigned int max, int openmax) +{ + int changed = 0; + assert(!snd_interval_empty(i)); + if (i->max > max) { + i->max = max; + i->openmax = openmax; + changed = 1; + } else if (i->max == max && !i->openmax && openmax) { + i->openmax = 1; + changed = 1; + } + if (i->integer) { + if (i->openmax) { + i->max--; + i->openmax = 0; + } + } + if (snd_interval_checkempty(i)) { + snd_interval_none(i); + return -EINVAL; + } + return changed; +} + +/** + * snd_interval_refine - refine the interval value of configurator + * @i: the interval value to refine + * @v: the interval value to refer to + * + * Refines the interval value with the reference value. + * The interval is changed to the range satisfying both intervals. + * The interval status (min, max, integer, etc.) are evaluated. + * + * Returns non-zero if the value is changed, zero if not changed. + */ +int snd_interval_refine(snd_interval_t *i, const snd_interval_t *v) +{ + int changed = 0; + assert(!snd_interval_empty(i)); + if (i->min < v->min) { + i->min = v->min; + i->openmin = v->openmin; + changed = 1; + } else if (i->min == v->min && !i->openmin && v->openmin) { + i->openmin = 1; + changed = 1; + } + if (i->max > v->max) { + i->max = v->max; + i->openmax = v->openmax; + changed = 1; + } else if (i->max == v->max && !i->openmax && v->openmax) { + i->openmax = 1; + changed = 1; + } + if (!i->integer && v->integer) { + i->integer = 1; + changed = 1; + } + if (i->integer) { + if (i->openmin) { + i->min++; + i->openmin = 0; + } + if (i->openmax) { + i->max--; + i->openmax = 0; + } + } else if (!i->openmin && !i->openmax && i->min == i->max) + i->integer = 1; + if (snd_interval_checkempty(i)) { + snd_interval_none(i); + return -EINVAL; + } + return changed; +} + +static int snd_interval_refine_first(snd_interval_t *i) +{ + assert(!snd_interval_empty(i)); + if (snd_interval_single(i)) + return 0; + i->max = i->min; + i->openmax = i->openmin; + if (i->openmax) + i->max++; + return 1; +} + +static int snd_interval_refine_last(snd_interval_t *i) +{ + assert(!snd_interval_empty(i)); + if (snd_interval_single(i)) + return 0; + i->min = i->max; + i->openmin = i->openmax; + if (i->openmin) + i->min--; + return 1; +} + +static int snd_interval_refine_set(snd_interval_t *i, unsigned int val) +{ + snd_interval_t t; + t.empty = 0; + t.min = t.max = val; + t.openmin = t.openmax = 0; + t.integer = 1; + return snd_interval_refine(i, &t); +} + +void snd_interval_mul(const snd_interval_t *a, const snd_interval_t *b, snd_interval_t *c) +{ + if (a->empty || b->empty) { + snd_interval_none(c); + return; + } + c->empty = 0; + c->min = mul(a->min, b->min); + c->openmin = (a->openmin || b->openmin); + c->max = mul(a->max, b->max); + c->openmax = (a->openmax || b->openmax); + c->integer = (a->integer && b->integer); +} + +/** + * snd_interval_div - refine the interval value with division + * + * c = a / b + * + * Returns non-zero if the value is changed, zero if not changed. + */ +void snd_interval_div(const snd_interval_t *a, const snd_interval_t *b, snd_interval_t *c) +{ + unsigned int r; + if (a->empty || b->empty) { + snd_interval_none(c); + return; + } + c->empty = 0; + c->min = div32(a->min, b->max, &r); + c->openmin = (r || a->openmin || b->openmax); + if (b->min > 0) { + c->max = div32(a->max, b->min, &r); + if (r) { + c->max++; + c->openmax = 1; + } else + c->openmax = (a->openmax || b->openmin); + } else { + c->max = UINT_MAX; + c->openmax = 0; + } + c->integer = 0; +} + +/** + * snd_interval_muldivk - refine the interval value + * + * c = a * b / k + * + * Returns non-zero if the value is changed, zero if not changed. + */ +void snd_interval_muldivk(const snd_interval_t *a, const snd_interval_t *b, + unsigned int k, snd_interval_t *c) +{ + unsigned int r; + if (a->empty || b->empty) { + snd_interval_none(c); + return; + } + c->empty = 0; + c->min = muldiv32(a->min, b->min, k, &r); + c->openmin = (r || a->openmin || b->openmin); + c->max = muldiv32(a->max, b->max, k, &r); + if (r) { + c->max++; + c->openmax = 1; + } else + c->openmax = (a->openmax || b->openmax); + c->integer = 0; +} + +/** + * snd_interval_mulkdiv - refine the interval value + * + * c = a * k / b + * + * Returns non-zero if the value is changed, zero if not changed. + */ +void snd_interval_mulkdiv(const snd_interval_t *a, unsigned int k, + const snd_interval_t *b, snd_interval_t *c) +{ + unsigned int r; + if (a->empty || b->empty) { + snd_interval_none(c); + return; + } + c->empty = 0; + c->min = muldiv32(a->min, k, b->max, &r); + c->openmin = (r || a->openmin || b->openmax); + if (b->min > 0) { + c->max = muldiv32(a->max, k, b->min, &r); + if (r) { + c->max++; + c->openmax = 1; + } else + c->openmax = (a->openmax || b->openmin); + } else { + c->max = UINT_MAX; + c->openmax = 0; + } + c->integer = 0; +} + +#undef assert +/* ---- */ + + +/** + * snd_interval_ratnum - refine the interval value + * + * Returns non-zero if the value is changed, zero if not changed. + */ +int snd_interval_ratnum(snd_interval_t *i, + unsigned int rats_count, ratnum_t *rats, + unsigned int *nump, unsigned int *denp) +{ + unsigned int best_num, best_diff, best_den; + unsigned int k; + snd_interval_t t; + int err; + + best_num = best_den = best_diff = 0; + for (k = 0; k < rats_count; ++k) { + unsigned int num = rats[k].num; + unsigned int den; + unsigned int q = i->min; + int diff; + if (q == 0) + q = 1; + den = div_down(num, q); + if (den < rats[k].den_min) + continue; + if (den > rats[k].den_max) + den = rats[k].den_max; + else { + unsigned int r; + r = (den - rats[k].den_min) % rats[k].den_step; + if (r != 0) + den -= r; + } + diff = num - q * den; + if (best_num == 0 || + diff * best_den < best_diff * den) { + best_diff = diff; + best_den = den; + best_num = num; + } + } + if (best_den == 0) { + i->empty = 1; + return -EINVAL; + } + t.min = div_down(best_num, best_den); + t.openmin = !!(best_num % best_den); + + best_num = best_den = best_diff = 0; + for (k = 0; k < rats_count; ++k) { + unsigned int num = rats[k].num; + unsigned int den; + unsigned int q = i->max; + int diff; + if (q == 0) { + i->empty = 1; + return -EINVAL; + } + den = div_up(num, q); + if (den > rats[k].den_max) + continue; + if (den < rats[k].den_min) + den = rats[k].den_min; + else { + unsigned int r; + r = (den - rats[k].den_min) % rats[k].den_step; + if (r != 0) + den += rats[k].den_step - r; + } + diff = q * den - num; + if (best_num == 0 || + diff * best_den < best_diff * den) { + best_diff = diff; + best_den = den; + best_num = num; + } + } + if (best_den == 0) { + i->empty = 1; + return -EINVAL; + } + t.max = div_up(best_num, best_den); + t.openmax = !!(best_num % best_den); + t.integer = 0; + err = snd_interval_refine(i, &t); + if (err < 0) + return err; + + if (snd_interval_single(i)) { + if (nump) + *nump = best_num; + if (denp) + *denp = best_den; + } + return err; +} + +/** + * snd_interval_ratden - refine the interval value + * + * Returns non-zero if the value is changed, zero if not changed. + */ +static int snd_interval_ratden(snd_interval_t *i, + unsigned int rats_count, ratden_t *rats, + unsigned int *nump, unsigned int *denp) +{ + unsigned int best_num, best_diff, best_den; + unsigned int k; + snd_interval_t t; + int err; + + best_num = best_den = best_diff = 0; + for (k = 0; k < rats_count; ++k) { + unsigned int num; + unsigned int den = rats[k].den; + unsigned int q = i->min; + int diff; + num = mul(q, den); + if (num > rats[k].num_max) + continue; + if (num < rats[k].num_min) + num = rats[k].num_max; + else { + unsigned int r; + r = (num - rats[k].num_min) % rats[k].num_step; + if (r != 0) + num += rats[k].num_step - r; + } + diff = num - q * den; + if (best_num == 0 || + diff * best_den < best_diff * den) { + best_diff = diff; + best_den = den; + best_num = num; + } + } + if (best_den == 0) { + i->empty = 1; + return -EINVAL; + } + t.min = div_down(best_num, best_den); + t.openmin = !!(best_num % best_den); + + best_num = best_den = best_diff = 0; + for (k = 0; k < rats_count; ++k) { + unsigned int num; + unsigned int den = rats[k].den; + unsigned int q = i->max; + int diff; + num = mul(q, den); + if (num < rats[k].num_min) + continue; + if (num > rats[k].num_max) + num = rats[k].num_max; + else { + unsigned int r; + r = (num - rats[k].num_min) % rats[k].num_step; + if (r != 0) + num -= r; + } + diff = q * den - num; + if (best_num == 0 || + diff * best_den < best_diff * den) { + best_diff = diff; + best_den = den; + best_num = num; + } + } + if (best_den == 0) { + i->empty = 1; + return -EINVAL; + } + t.max = div_up(best_num, best_den); + t.openmax = !!(best_num % best_den); + t.integer = 0; + err = snd_interval_refine(i, &t); + if (err < 0) + return err; + + if (snd_interval_single(i)) { + if (nump) + *nump = best_num; + if (denp) + *denp = best_den; + } + return err; +} + +/** + * snd_interval_list - refine the interval value from the list + * @i: the interval value to refine + * @count: the number of elements in the list + * @list: the value list + * @mask: the bit-mask to evaluate + * + * Refines the interval value from the list. + * When mask is non-zero, only the elements corresponding to bit 1 are + * evaluated. + * + * Returns non-zero if the value is changed, zero if not changed. + */ +int snd_interval_list(snd_interval_t *i, unsigned int count, unsigned int *list, unsigned int mask) +{ + unsigned int k; + int changed = 0; + for (k = 0; k < count; k++) { + if (mask && !(mask & (1 << k))) + continue; + if (i->min == list[k] && !i->openmin) + goto _l1; + if (i->min < list[k]) { + i->min = list[k]; + i->openmin = 0; + changed = 1; + goto _l1; + } + } + i->empty = 1; + return -EINVAL; + _l1: + for (k = count; k-- > 0;) { + if (mask && !(mask & (1 << k))) + continue; + if (i->max == list[k] && !i->openmax) + goto _l2; + if (i->max > list[k]) { + i->max = list[k]; + i->openmax = 0; + changed = 1; + goto _l2; + } + } + i->empty = 1; + return -EINVAL; + _l2: + if (snd_interval_checkempty(i)) { + i->empty = 1; + return -EINVAL; + } + return changed; +} + +static int snd_interval_step(snd_interval_t *i, unsigned int min, unsigned int step) +{ + unsigned int n; + int changed = 0; + n = (i->min - min) % step; + if (n != 0 || i->openmin) { + i->min += step - n; + changed = 1; + } + n = (i->max - min) % step; + if (n != 0 || i->openmax) { + i->max -= n; + changed = 1; + } + if (snd_interval_checkempty(i)) { + i->empty = 1; + return -EINVAL; + } + return changed; +} + +/* Info constraints helpers */ + +/** + * snd_pcm_hw_rule_add - add the hw-constraint rule + * @runtime: the pcm runtime instance + * @cond: condition bits + * @var: the variable to evaluate + * @func: the evaluation function + * @private: the private data pointer passed to function + * @dep: the dependent variables + * + * Returns zero if successful, or a negative error code on failure. + */ +int snd_pcm_hw_rule_add(snd_pcm_runtime_t *runtime, unsigned int cond, + int var, + snd_pcm_hw_rule_func_t func, void *private, + int dep, ...) +{ + snd_pcm_hw_constraints_t *constrs = &runtime->hw_constraints; + snd_pcm_hw_rule_t *c; + unsigned int k; + va_list args; + va_start(args, dep); + if (constrs->rules_num >= constrs->rules_all) { + snd_pcm_hw_rule_t *new; + unsigned int new_rules = constrs->rules_all + 16; + new = kcalloc(new_rules, sizeof(*c), GFP_KERNEL); + if (!new) + return -ENOMEM; + if (constrs->rules) { + memcpy(new, constrs->rules, + constrs->rules_num * sizeof(*c)); + kfree(constrs->rules); + } + constrs->rules = new; + constrs->rules_all = new_rules; + } + c = &constrs->rules[constrs->rules_num]; + c->cond = cond; + c->func = func; + c->var = var; + c->private = private; + k = 0; + while (1) { + snd_assert(k < ARRAY_SIZE(c->deps), return -EINVAL); + c->deps[k++] = dep; + if (dep < 0) + break; + dep = va_arg(args, int); + } + constrs->rules_num++; + va_end(args); + return 0; +} + +/** + * snd_pcm_hw_constraint_mask + */ +int snd_pcm_hw_constraint_mask(snd_pcm_runtime_t *runtime, snd_pcm_hw_param_t var, + u_int32_t mask) +{ + snd_pcm_hw_constraints_t *constrs = &runtime->hw_constraints; + snd_mask_t *maskp = constrs_mask(constrs, var); + *maskp->bits &= mask; + memset(maskp->bits + 1, 0, (SNDRV_MASK_MAX-32) / 8); /* clear rest */ + if (*maskp->bits == 0) + return -EINVAL; + return 0; +} + +/** + * snd_pcm_hw_constraint_mask64 + */ +int snd_pcm_hw_constraint_mask64(snd_pcm_runtime_t *runtime, snd_pcm_hw_param_t var, + u_int64_t mask) +{ + snd_pcm_hw_constraints_t *constrs = &runtime->hw_constraints; + snd_mask_t *maskp = constrs_mask(constrs, var); + maskp->bits[0] &= (u_int32_t)mask; + maskp->bits[1] &= (u_int32_t)(mask >> 32); + memset(maskp->bits + 2, 0, (SNDRV_MASK_MAX-64) / 8); /* clear rest */ + if (! maskp->bits[0] && ! maskp->bits[1]) + return -EINVAL; + return 0; +} + +/** + * snd_pcm_hw_constraint_integer + */ +int snd_pcm_hw_constraint_integer(snd_pcm_runtime_t *runtime, snd_pcm_hw_param_t var) +{ + snd_pcm_hw_constraints_t *constrs = &runtime->hw_constraints; + return snd_interval_setinteger(constrs_interval(constrs, var)); +} + +/** + * snd_pcm_hw_constraint_minmax + */ +int snd_pcm_hw_constraint_minmax(snd_pcm_runtime_t *runtime, snd_pcm_hw_param_t var, + unsigned int min, unsigned int max) +{ + snd_pcm_hw_constraints_t *constrs = &runtime->hw_constraints; + snd_interval_t t; + t.min = min; + t.max = max; + t.openmin = t.openmax = 0; + t.integer = 0; + return snd_interval_refine(constrs_interval(constrs, var), &t); +} + +static int snd_pcm_hw_rule_list(snd_pcm_hw_params_t *params, + snd_pcm_hw_rule_t *rule) +{ + snd_pcm_hw_constraint_list_t *list = rule->private; + return snd_interval_list(hw_param_interval(params, rule->var), list->count, list->list, list->mask); +} + + +/** + * snd_pcm_hw_constraint_list + */ +int snd_pcm_hw_constraint_list(snd_pcm_runtime_t *runtime, + unsigned int cond, + snd_pcm_hw_param_t var, + snd_pcm_hw_constraint_list_t *l) +{ + return snd_pcm_hw_rule_add(runtime, cond, var, + snd_pcm_hw_rule_list, l, + var, -1); +} + +static int snd_pcm_hw_rule_ratnums(snd_pcm_hw_params_t *params, + snd_pcm_hw_rule_t *rule) +{ + snd_pcm_hw_constraint_ratnums_t *r = rule->private; + unsigned int num = 0, den = 0; + int err; + err = snd_interval_ratnum(hw_param_interval(params, rule->var), + r->nrats, r->rats, &num, &den); + if (err >= 0 && den && rule->var == SNDRV_PCM_HW_PARAM_RATE) { + params->rate_num = num; + params->rate_den = den; + } + return err; +} + +/** + * snd_pcm_hw_constraint_ratnums + */ +int snd_pcm_hw_constraint_ratnums(snd_pcm_runtime_t *runtime, + unsigned int cond, + snd_pcm_hw_param_t var, + snd_pcm_hw_constraint_ratnums_t *r) +{ + return snd_pcm_hw_rule_add(runtime, cond, var, + snd_pcm_hw_rule_ratnums, r, + var, -1); +} + +static int snd_pcm_hw_rule_ratdens(snd_pcm_hw_params_t *params, + snd_pcm_hw_rule_t *rule) +{ + snd_pcm_hw_constraint_ratdens_t *r = rule->private; + unsigned int num = 0, den = 0; + int err = snd_interval_ratden(hw_param_interval(params, rule->var), + r->nrats, r->rats, &num, &den); + if (err >= 0 && den && rule->var == SNDRV_PCM_HW_PARAM_RATE) { + params->rate_num = num; + params->rate_den = den; + } + return err; +} + +/** + * snd_pcm_hw_constraint_ratdens + */ +int snd_pcm_hw_constraint_ratdens(snd_pcm_runtime_t *runtime, + unsigned int cond, + snd_pcm_hw_param_t var, + snd_pcm_hw_constraint_ratdens_t *r) +{ + return snd_pcm_hw_rule_add(runtime, cond, var, + snd_pcm_hw_rule_ratdens, r, + var, -1); +} + +static int snd_pcm_hw_rule_msbits(snd_pcm_hw_params_t *params, + snd_pcm_hw_rule_t *rule) +{ + unsigned int l = (unsigned long) rule->private; + int width = l & 0xffff; + unsigned int msbits = l >> 16; + snd_interval_t *i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS); + if (snd_interval_single(i) && snd_interval_value(i) == width) + params->msbits = msbits; + return 0; +} + +/** + * snd_pcm_hw_constraint_msbits + */ +int snd_pcm_hw_constraint_msbits(snd_pcm_runtime_t *runtime, + unsigned int cond, + unsigned int width, + unsigned int msbits) +{ + unsigned long l = (msbits << 16) | width; + return snd_pcm_hw_rule_add(runtime, cond, -1, + snd_pcm_hw_rule_msbits, + (void*) l, + SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1); +} + +static int snd_pcm_hw_rule_step(snd_pcm_hw_params_t *params, + snd_pcm_hw_rule_t *rule) +{ + unsigned long step = (unsigned long) rule->private; + return snd_interval_step(hw_param_interval(params, rule->var), 0, step); +} + +/** + * snd_pcm_hw_constraint_step + */ +int snd_pcm_hw_constraint_step(snd_pcm_runtime_t *runtime, + unsigned int cond, + snd_pcm_hw_param_t var, + unsigned long step) +{ + return snd_pcm_hw_rule_add(runtime, cond, var, + snd_pcm_hw_rule_step, (void *) step, + var, -1); +} + +static int snd_pcm_hw_rule_pow2(snd_pcm_hw_params_t *params, snd_pcm_hw_rule_t *rule) +{ + static int pow2_sizes[] = { + 1<<0, 1<<1, 1<<2, 1<<3, 1<<4, 1<<5, 1<<6, 1<<7, + 1<<8, 1<<9, 1<<10, 1<<11, 1<<12, 1<<13, 1<<14, 1<<15, + 1<<16, 1<<17, 1<<18, 1<<19, 1<<20, 1<<21, 1<<22, 1<<23, + 1<<24, 1<<25, 1<<26, 1<<27, 1<<28, 1<<29, 1<<30 + }; + return snd_interval_list(hw_param_interval(params, rule->var), + ARRAY_SIZE(pow2_sizes), pow2_sizes, 0); +} + +/** + * snd_pcm_hw_constraint_pow2 + */ +int snd_pcm_hw_constraint_pow2(snd_pcm_runtime_t *runtime, + unsigned int cond, + snd_pcm_hw_param_t var) +{ + return snd_pcm_hw_rule_add(runtime, cond, var, + snd_pcm_hw_rule_pow2, NULL, + var, -1); +} + +/* To use the same code we have in alsa-lib */ +#define snd_pcm_t snd_pcm_substream_t +#define assert(i) snd_assert((i), return -EINVAL) +#ifndef INT_MIN +#define INT_MIN ((int)((unsigned int)INT_MAX+1)) +#endif + +void _snd_pcm_hw_param_any(snd_pcm_hw_params_t *params, snd_pcm_hw_param_t var) +{ + if (hw_is_mask(var)) { + snd_mask_any(hw_param_mask(params, var)); + params->cmask |= 1 << var; + params->rmask |= 1 << var; + return; + } + if (hw_is_interval(var)) { + snd_interval_any(hw_param_interval(params, var)); + params->cmask |= 1 << var; + params->rmask |= 1 << var; + return; + } + snd_BUG(); +} + +/** + * snd_pcm_hw_param_any + */ +int snd_pcm_hw_param_any(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, + snd_pcm_hw_param_t var) +{ + _snd_pcm_hw_param_any(params, var); + return snd_pcm_hw_refine(pcm, params); +} + +void _snd_pcm_hw_params_any(snd_pcm_hw_params_t *params) +{ + unsigned int k; + memset(params, 0, sizeof(*params)); + for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++) + _snd_pcm_hw_param_any(params, k); + for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++) + _snd_pcm_hw_param_any(params, k); + params->info = ~0U; +} + +/** + * snd_pcm_hw_params_any + * + * Fill PARAMS with full configuration space boundaries + */ +int snd_pcm_hw_params_any(snd_pcm_t *pcm, snd_pcm_hw_params_t *params) +{ + _snd_pcm_hw_params_any(params); + return snd_pcm_hw_refine(pcm, params); +} + +/** + * snd_pcm_hw_param_value + * + * Return the value for field PAR if it's fixed in configuration space + * defined by PARAMS. Return -EINVAL otherwise + */ +int snd_pcm_hw_param_value(const snd_pcm_hw_params_t *params, + snd_pcm_hw_param_t var, int *dir) +{ + if (hw_is_mask(var)) { + const snd_mask_t *mask = hw_param_mask_c(params, var); + if (!snd_mask_single(mask)) + return -EINVAL; + if (dir) + *dir = 0; + return snd_mask_value(mask); + } + if (hw_is_interval(var)) { + const snd_interval_t *i = hw_param_interval_c(params, var); + if (!snd_interval_single(i)) + return -EINVAL; + if (dir) + *dir = i->openmin; + return snd_interval_value(i); + } + assert(0); + return -EINVAL; +} + +/** + * snd_pcm_hw_param_value_min + * + * Return the minimum value for field PAR. + */ +unsigned int snd_pcm_hw_param_value_min(const snd_pcm_hw_params_t *params, + snd_pcm_hw_param_t var, int *dir) +{ + if (hw_is_mask(var)) { + if (dir) + *dir = 0; + return snd_mask_min(hw_param_mask_c(params, var)); + } + if (hw_is_interval(var)) { + const snd_interval_t *i = hw_param_interval_c(params, var); + if (dir) + *dir = i->openmin; + return snd_interval_min(i); + } + assert(0); + return -EINVAL; +} + +/** + * snd_pcm_hw_param_value_max + * + * Return the maximum value for field PAR. + */ +unsigned int snd_pcm_hw_param_value_max(const snd_pcm_hw_params_t *params, + snd_pcm_hw_param_t var, int *dir) +{ + if (hw_is_mask(var)) { + if (dir) + *dir = 0; + return snd_mask_max(hw_param_mask_c(params, var)); + } + if (hw_is_interval(var)) { + const snd_interval_t *i = hw_param_interval_c(params, var); + if (dir) + *dir = - (int) i->openmax; + return snd_interval_max(i); + } + assert(0); + return -EINVAL; +} + +void _snd_pcm_hw_param_setempty(snd_pcm_hw_params_t *params, + snd_pcm_hw_param_t var) +{ + if (hw_is_mask(var)) { + snd_mask_none(hw_param_mask(params, var)); + params->cmask |= 1 << var; + params->rmask |= 1 << var; + } else if (hw_is_interval(var)) { + snd_interval_none(hw_param_interval(params, var)); + params->cmask |= 1 << var; + params->rmask |= 1 << var; + } else { + snd_BUG(); + } +} + +int _snd_pcm_hw_param_setinteger(snd_pcm_hw_params_t *params, + snd_pcm_hw_param_t var) +{ + int changed; + assert(hw_is_interval(var)); + changed = snd_interval_setinteger(hw_param_interval(params, var)); + if (changed) { + params->cmask |= 1 << var; + params->rmask |= 1 << var; + } + return changed; +} + +/** + * snd_pcm_hw_param_setinteger + * + * Inside configuration space defined by PARAMS remove from PAR all + * non integer values. Reduce configuration space accordingly. + * Return -EINVAL if the configuration space is empty + */ +int snd_pcm_hw_param_setinteger(snd_pcm_t *pcm, + snd_pcm_hw_params_t *params, + snd_pcm_hw_param_t var) +{ + int changed = _snd_pcm_hw_param_setinteger(params, var); + if (changed < 0) + return changed; + if (params->rmask) { + int err = snd_pcm_hw_refine(pcm, params); + if (err < 0) + return err; + } + return 0; +} + +int _snd_pcm_hw_param_first(snd_pcm_hw_params_t *params, + snd_pcm_hw_param_t var) +{ + int changed; + if (hw_is_mask(var)) + changed = snd_mask_refine_first(hw_param_mask(params, var)); + else if (hw_is_interval(var)) + changed = snd_interval_refine_first(hw_param_interval(params, var)); + else { + assert(0); + return -EINVAL; + } + if (changed) { + params->cmask |= 1 << var; + params->rmask |= 1 << var; + } + return changed; +} + + +/** + * snd_pcm_hw_param_first + * + * Inside configuration space defined by PARAMS remove from PAR all + * values > minimum. Reduce configuration space accordingly. + * Return the minimum. + */ +int snd_pcm_hw_param_first(snd_pcm_t *pcm, + snd_pcm_hw_params_t *params, + snd_pcm_hw_param_t var, int *dir) +{ + int changed = _snd_pcm_hw_param_first(params, var); + if (changed < 0) + return changed; + if (params->rmask) { + int err = snd_pcm_hw_refine(pcm, params); + assert(err >= 0); + } + return snd_pcm_hw_param_value(params, var, dir); +} + +int _snd_pcm_hw_param_last(snd_pcm_hw_params_t *params, + snd_pcm_hw_param_t var) +{ + int changed; + if (hw_is_mask(var)) + changed = snd_mask_refine_last(hw_param_mask(params, var)); + else if (hw_is_interval(var)) + changed = snd_interval_refine_last(hw_param_interval(params, var)); + else { + assert(0); + return -EINVAL; + } + if (changed) { + params->cmask |= 1 << var; + params->rmask |= 1 << var; + } + return changed; +} + + +/** + * snd_pcm_hw_param_last + * + * Inside configuration space defined by PARAMS remove from PAR all + * values < maximum. Reduce configuration space accordingly. + * Return the maximum. + */ +int snd_pcm_hw_param_last(snd_pcm_t *pcm, + snd_pcm_hw_params_t *params, + snd_pcm_hw_param_t var, int *dir) +{ + int changed = _snd_pcm_hw_param_last(params, var); + if (changed < 0) + return changed; + if (params->rmask) { + int err = snd_pcm_hw_refine(pcm, params); + assert(err >= 0); + } + return snd_pcm_hw_param_value(params, var, dir); +} + +int _snd_pcm_hw_param_min(snd_pcm_hw_params_t *params, + snd_pcm_hw_param_t var, unsigned int val, int dir) +{ + int changed; + int open = 0; + if (dir) { + if (dir > 0) { + open = 1; + } else if (dir < 0) { + if (val > 0) { + open = 1; + val--; + } + } + } + if (hw_is_mask(var)) + changed = snd_mask_refine_min(hw_param_mask(params, var), val + !!open); + else if (hw_is_interval(var)) + changed = snd_interval_refine_min(hw_param_interval(params, var), val, open); + else { + assert(0); + return -EINVAL; + } + if (changed) { + params->cmask |= 1 << var; + params->rmask |= 1 << var; + } + return changed; +} + +/** + * snd_pcm_hw_param_min + * + * Inside configuration space defined by PARAMS remove from PAR all + * values < VAL. Reduce configuration space accordingly. + * Return new minimum or -EINVAL if the configuration space is empty + */ +int snd_pcm_hw_param_min(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, + snd_pcm_hw_param_t var, unsigned int val, int *dir) +{ + int changed = _snd_pcm_hw_param_min(params, var, val, dir ? *dir : 0); + if (changed < 0) + return changed; + if (params->rmask) { + int err = snd_pcm_hw_refine(pcm, params); + if (err < 0) + return err; + } + return snd_pcm_hw_param_value_min(params, var, dir); +} + +int _snd_pcm_hw_param_max(snd_pcm_hw_params_t *params, + snd_pcm_hw_param_t var, unsigned int val, int dir) +{ + int changed; + int open = 0; + if (dir) { + if (dir < 0) { + open = 1; + } else if (dir > 0) { + open = 1; + val++; + } + } + if (hw_is_mask(var)) { + if (val == 0 && open) { + snd_mask_none(hw_param_mask(params, var)); + changed = -EINVAL; + } else + changed = snd_mask_refine_max(hw_param_mask(params, var), val - !!open); + } else if (hw_is_interval(var)) + changed = snd_interval_refine_max(hw_param_interval(params, var), val, open); + else { + assert(0); + return -EINVAL; + } + if (changed) { + params->cmask |= 1 << var; + params->rmask |= 1 << var; + } + return changed; +} + +/** + * snd_pcm_hw_param_max + * + * Inside configuration space defined by PARAMS remove from PAR all + * values >= VAL + 1. Reduce configuration space accordingly. + * Return new maximum or -EINVAL if the configuration space is empty + */ +int snd_pcm_hw_param_max(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, + snd_pcm_hw_param_t var, unsigned int val, int *dir) +{ + int changed = _snd_pcm_hw_param_max(params, var, val, dir ? *dir : 0); + if (changed < 0) + return changed; + if (params->rmask) { + int err = snd_pcm_hw_refine(pcm, params); + if (err < 0) + return err; + } + return snd_pcm_hw_param_value_max(params, var, dir); +} + +int _snd_pcm_hw_param_set(snd_pcm_hw_params_t *params, + snd_pcm_hw_param_t var, unsigned int val, int dir) +{ + int changed; + if (hw_is_mask(var)) { + snd_mask_t *m = hw_param_mask(params, var); + if (val == 0 && dir < 0) { + changed = -EINVAL; + snd_mask_none(m); + } else { + if (dir > 0) + val++; + else if (dir < 0) + val--; + changed = snd_mask_refine_set(hw_param_mask(params, var), val); + } + } else if (hw_is_interval(var)) { + snd_interval_t *i = hw_param_interval(params, var); + if (val == 0 && dir < 0) { + changed = -EINVAL; + snd_interval_none(i); + } else if (dir == 0) + changed = snd_interval_refine_set(i, val); + else { + snd_interval_t t; + t.openmin = 1; + t.openmax = 1; + t.empty = 0; + t.integer = 0; + if (dir < 0) { + t.min = val - 1; + t.max = val; + } else { + t.min = val; + t.max = val+1; + } + changed = snd_interval_refine(i, &t); + } + } else { + assert(0); + return -EINVAL; + } + if (changed) { + params->cmask |= 1 << var; + params->rmask |= 1 << var; + } + return changed; +} + +/** + * snd_pcm_hw_param_set + * + * Inside configuration space defined by PARAMS remove from PAR all + * values != VAL. Reduce configuration space accordingly. + * Return VAL or -EINVAL if the configuration space is empty + */ +int snd_pcm_hw_param_set(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, + snd_pcm_hw_param_t var, unsigned int val, int dir) +{ + int changed = _snd_pcm_hw_param_set(params, var, val, dir); + if (changed < 0) + return changed; + if (params->rmask) { + int err = snd_pcm_hw_refine(pcm, params); + if (err < 0) + return err; + } + return snd_pcm_hw_param_value(params, var, NULL); +} + +int _snd_pcm_hw_param_mask(snd_pcm_hw_params_t *params, + snd_pcm_hw_param_t var, const snd_mask_t *val) +{ + int changed; + assert(hw_is_mask(var)); + changed = snd_mask_refine(hw_param_mask(params, var), val); + if (changed) { + params->cmask |= 1 << var; + params->rmask |= 1 << var; + } + return changed; +} + +/** + * snd_pcm_hw_param_mask + * + * Inside configuration space defined by PARAMS remove from PAR all values + * not contained in MASK. Reduce configuration space accordingly. + * This function can be called only for SNDRV_PCM_HW_PARAM_ACCESS, + * SNDRV_PCM_HW_PARAM_FORMAT, SNDRV_PCM_HW_PARAM_SUBFORMAT. + * Return 0 on success or -EINVAL + * if the configuration space is empty + */ +int snd_pcm_hw_param_mask(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, + snd_pcm_hw_param_t var, const snd_mask_t *val) +{ + int changed = _snd_pcm_hw_param_mask(params, var, val); + if (changed < 0) + return changed; + if (params->rmask) { + int err = snd_pcm_hw_refine(pcm, params); + if (err < 0) + return err; + } + return 0; +} + +static int boundary_sub(int a, int adir, + int b, int bdir, + int *c, int *cdir) +{ + adir = adir < 0 ? -1 : (adir > 0 ? 1 : 0); + bdir = bdir < 0 ? -1 : (bdir > 0 ? 1 : 0); + *c = a - b; + *cdir = adir - bdir; + if (*cdir == -2) { + assert(*c > INT_MIN); + (*c)--; + } else if (*cdir == 2) { + assert(*c < INT_MAX); + (*c)++; + } + return 0; +} + +static int boundary_lt(unsigned int a, int adir, + unsigned int b, int bdir) +{ + assert(a > 0 || adir >= 0); + assert(b > 0 || bdir >= 0); + if (adir < 0) { + a--; + adir = 1; + } else if (adir > 0) + adir = 1; + if (bdir < 0) { + b--; + bdir = 1; + } else if (bdir > 0) + bdir = 1; + return a < b || (a == b && adir < bdir); +} + +/* Return 1 if min is nearer to best than max */ +static int boundary_nearer(int min, int mindir, + int best, int bestdir, + int max, int maxdir) +{ + int dmin, dmindir; + int dmax, dmaxdir; + boundary_sub(best, bestdir, min, mindir, &dmin, &dmindir); + boundary_sub(max, maxdir, best, bestdir, &dmax, &dmaxdir); + return boundary_lt(dmin, dmindir, dmax, dmaxdir); +} + +/** + * snd_pcm_hw_param_near + * + * Inside configuration space defined by PARAMS set PAR to the available value + * nearest to VAL. Reduce configuration space accordingly. + * This function cannot be called for SNDRV_PCM_HW_PARAM_ACCESS, + * SNDRV_PCM_HW_PARAM_FORMAT, SNDRV_PCM_HW_PARAM_SUBFORMAT. + * Return the value found. + */ +int snd_pcm_hw_param_near(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, + snd_pcm_hw_param_t var, unsigned int best, int *dir) +{ + snd_pcm_hw_params_t *save = NULL; + int v; + unsigned int saved_min; + int last = 0; + int min, max; + int mindir, maxdir; + int valdir = dir ? *dir : 0; + /* FIXME */ + if (best > INT_MAX) + best = INT_MAX; + min = max = best; + mindir = maxdir = valdir; + if (maxdir > 0) + maxdir = 0; + else if (maxdir == 0) + maxdir = -1; + else { + maxdir = 1; + max--; + } + save = kmalloc(sizeof(*save), GFP_KERNEL); + if (save == NULL) + return -ENOMEM; + *save = *params; + saved_min = min; + min = snd_pcm_hw_param_min(pcm, params, var, min, &mindir); + if (min >= 0) { + snd_pcm_hw_params_t *params1; + if (max < 0) + goto _end; + if ((unsigned int)min == saved_min && mindir == valdir) + goto _end; + params1 = kmalloc(sizeof(*params1), GFP_KERNEL); + if (params1 == NULL) { + kfree(save); + return -ENOMEM; + } + *params1 = *save; + max = snd_pcm_hw_param_max(pcm, params1, var, max, &maxdir); + if (max < 0) { + kfree(params1); + goto _end; + } + if (boundary_nearer(max, maxdir, best, valdir, min, mindir)) { + *params = *params1; + last = 1; + } + kfree(params1); + } else { + *params = *save; + max = snd_pcm_hw_param_max(pcm, params, var, max, &maxdir); + assert(max >= 0); + last = 1; + } + _end: + kfree(save); + if (last) + v = snd_pcm_hw_param_last(pcm, params, var, dir); + else + v = snd_pcm_hw_param_first(pcm, params, var, dir); + assert(v >= 0); + return v; +} + +/** + * snd_pcm_hw_param_choose + * + * Choose one configuration from configuration space defined by PARAMS + * The configuration chosen is that obtained fixing in this order: + * first access, first format, first subformat, min channels, + * min rate, min period time, max buffer size, min tick time + */ +int snd_pcm_hw_params_choose(snd_pcm_t *pcm, snd_pcm_hw_params_t *params) +{ + int err; + + err = snd_pcm_hw_param_first(pcm, params, SNDRV_PCM_HW_PARAM_ACCESS, NULL); + assert(err >= 0); + + err = snd_pcm_hw_param_first(pcm, params, SNDRV_PCM_HW_PARAM_FORMAT, NULL); + assert(err >= 0); + + err = snd_pcm_hw_param_first(pcm, params, SNDRV_PCM_HW_PARAM_SUBFORMAT, NULL); + assert(err >= 0); + + err = snd_pcm_hw_param_first(pcm, params, SNDRV_PCM_HW_PARAM_CHANNELS, NULL); + assert(err >= 0); + + err = snd_pcm_hw_param_first(pcm, params, SNDRV_PCM_HW_PARAM_RATE, NULL); + assert(err >= 0); + + err = snd_pcm_hw_param_first(pcm, params, SNDRV_PCM_HW_PARAM_PERIOD_TIME, NULL); + assert(err >= 0); + + err = snd_pcm_hw_param_last(pcm, params, SNDRV_PCM_HW_PARAM_BUFFER_SIZE, NULL); + assert(err >= 0); + + err = snd_pcm_hw_param_first(pcm, params, SNDRV_PCM_HW_PARAM_TICK_TIME, NULL); + assert(err >= 0); + + return 0; +} + +#undef snd_pcm_t +#undef assert + +static int snd_pcm_lib_ioctl_reset(snd_pcm_substream_t *substream, + void *arg) +{ + snd_pcm_runtime_t *runtime = substream->runtime; + unsigned long flags; + snd_pcm_stream_lock_irqsave(substream, flags); + if (snd_pcm_running(substream) && + snd_pcm_update_hw_ptr(substream) >= 0) + runtime->status->hw_ptr %= runtime->buffer_size; + else + runtime->status->hw_ptr = 0; + snd_pcm_stream_unlock_irqrestore(substream, flags); + return 0; +} + +static int snd_pcm_lib_ioctl_channel_info(snd_pcm_substream_t *substream, + void *arg) +{ + snd_pcm_channel_info_t *info = arg; + snd_pcm_runtime_t *runtime = substream->runtime; + int width; + if (!(runtime->info & SNDRV_PCM_INFO_MMAP)) { + info->offset = -1; + return 0; + } + width = snd_pcm_format_physical_width(runtime->format); + if (width < 0) + return width; + info->offset = 0; + switch (runtime->access) { + case SNDRV_PCM_ACCESS_MMAP_INTERLEAVED: + case SNDRV_PCM_ACCESS_RW_INTERLEAVED: + info->first = info->channel * width; + info->step = runtime->channels * width; + break; + case SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED: + case SNDRV_PCM_ACCESS_RW_NONINTERLEAVED: + { + size_t size = runtime->dma_bytes / runtime->channels; + info->first = info->channel * size * 8; + info->step = width; + break; + } + default: + snd_BUG(); + break; + } + return 0; +} + +/** + * snd_pcm_lib_ioctl - a generic PCM ioctl callback + * @substream: the pcm substream instance + * @cmd: ioctl command + * @arg: ioctl argument + * + * Processes the generic ioctl commands for PCM. + * Can be passed as the ioctl callback for PCM ops. + * + * Returns zero if successful, or a negative error code on failure. + */ +int snd_pcm_lib_ioctl(snd_pcm_substream_t *substream, + unsigned int cmd, void *arg) +{ + switch (cmd) { + case SNDRV_PCM_IOCTL1_INFO: + return 0; + case SNDRV_PCM_IOCTL1_RESET: + return snd_pcm_lib_ioctl_reset(substream, arg); + case SNDRV_PCM_IOCTL1_CHANNEL_INFO: + return snd_pcm_lib_ioctl_channel_info(substream, arg); + } + return -ENXIO; +} + +/* + * Conditions + */ + +static void snd_pcm_system_tick_set(snd_pcm_substream_t *substream, + unsigned long ticks) +{ + snd_pcm_runtime_t *runtime = substream->runtime; + if (ticks == 0) + del_timer(&runtime->tick_timer); + else { + ticks += (1000000 / HZ) - 1; + ticks /= (1000000 / HZ); + mod_timer(&runtime->tick_timer, jiffies + ticks); + } +} + +/* Temporary alias */ +void snd_pcm_tick_set(snd_pcm_substream_t *substream, unsigned long ticks) +{ + snd_pcm_system_tick_set(substream, ticks); +} + +void snd_pcm_tick_prepare(snd_pcm_substream_t *substream) +{ + snd_pcm_runtime_t *runtime = substream->runtime; + snd_pcm_uframes_t frames = ULONG_MAX; + snd_pcm_uframes_t avail, dist; + unsigned int ticks; + u_int64_t n; + u_int32_t r; + if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) { + if (runtime->silence_size >= runtime->boundary) { + frames = 1; + } else if (runtime->silence_size > 0 && + runtime->silence_filled < runtime->buffer_size) { + snd_pcm_sframes_t noise_dist; + noise_dist = snd_pcm_playback_hw_avail(runtime) + runtime->silence_filled; + snd_assert(noise_dist <= (snd_pcm_sframes_t)runtime->silence_threshold, ); + frames = noise_dist - runtime->silence_threshold; + } + avail = snd_pcm_playback_avail(runtime); + } else { + avail = snd_pcm_capture_avail(runtime); + } + if (avail < runtime->control->avail_min) { + snd_pcm_sframes_t n = runtime->control->avail_min - avail; + if (n > 0 && frames > (snd_pcm_uframes_t)n) + frames = n; + } + if (avail < runtime->buffer_size) { + snd_pcm_sframes_t n = runtime->buffer_size - avail; + if (n > 0 && frames > (snd_pcm_uframes_t)n) + frames = n; + } + if (frames == ULONG_MAX) { + snd_pcm_tick_set(substream, 0); + return; + } + dist = runtime->status->hw_ptr - runtime->hw_ptr_base; + /* Distance to next interrupt */ + dist = runtime->period_size - dist % runtime->period_size; + if (dist <= frames) { + snd_pcm_tick_set(substream, 0); + return; + } + /* the base time is us */ + n = frames; + n *= 1000000; + div64_32(&n, runtime->tick_time * runtime->rate, &r); + ticks = n + (r > 0 ? 1 : 0); + if (ticks < runtime->sleep_min) + ticks = runtime->sleep_min; + snd_pcm_tick_set(substream, (unsigned long) ticks); +} + +void snd_pcm_tick_elapsed(snd_pcm_substream_t *substream) +{ + snd_pcm_runtime_t *runtime; + unsigned long flags; + + snd_assert(substream != NULL, return); + runtime = substream->runtime; + snd_assert(runtime != NULL, return); + + snd_pcm_stream_lock_irqsave(substream, flags); + if (!snd_pcm_running(substream) || + snd_pcm_update_hw_ptr(substream) < 0) + goto _end; + if (runtime->sleep_min) + snd_pcm_tick_prepare(substream); + _end: + snd_pcm_stream_unlock_irqrestore(substream, flags); +} + +/** + * snd_pcm_period_elapsed - update the pcm status for the next period + * @substream: the pcm substream instance + * + * This function is called from the interrupt handler when the + * PCM has processed the period size. It will update the current + * pointer, set up the tick, wake up sleepers, etc. + * + * Even if more than one periods have elapsed since the last call, you + * have to call this only once. + */ +void snd_pcm_period_elapsed(snd_pcm_substream_t *substream) +{ + snd_pcm_runtime_t *runtime; + unsigned long flags; + + snd_assert(substream != NULL, return); + runtime = substream->runtime; + snd_assert(runtime != NULL, return); + + if (runtime->transfer_ack_begin) + runtime->transfer_ack_begin(substream); + + snd_pcm_stream_lock_irqsave(substream, flags); + if (!snd_pcm_running(substream) || + snd_pcm_update_hw_ptr_interrupt(substream) < 0) + goto _end; + + if (substream->timer_running) + snd_timer_interrupt(substream->timer, 1); + if (runtime->sleep_min) + snd_pcm_tick_prepare(substream); + _end: + snd_pcm_stream_unlock_irqrestore(substream, flags); + if (runtime->transfer_ack_end) + runtime->transfer_ack_end(substream); + kill_fasync(&runtime->fasync, SIGIO, POLL_IN); +} + +static int snd_pcm_lib_write_transfer(snd_pcm_substream_t *substream, + unsigned int hwoff, + unsigned long data, unsigned int off, + snd_pcm_uframes_t frames) +{ + snd_pcm_runtime_t *runtime = substream->runtime; + int err; + char __user *buf = (char __user *) data + frames_to_bytes(runtime, off); + if (substream->ops->copy) { + if ((err = substream->ops->copy(substream, -1, hwoff, buf, frames)) < 0) + return err; + } else { + char *hwbuf = runtime->dma_area + frames_to_bytes(runtime, hwoff); + snd_assert(runtime->dma_area, return -EFAULT); + if (copy_from_user(hwbuf, buf, frames_to_bytes(runtime, frames))) + return -EFAULT; + } + return 0; +} + +typedef int (*transfer_f)(snd_pcm_substream_t *substream, unsigned int hwoff, + unsigned long data, unsigned int off, + snd_pcm_uframes_t size); + +static snd_pcm_sframes_t snd_pcm_lib_write1(snd_pcm_substream_t *substream, + unsigned long data, + snd_pcm_uframes_t size, + int nonblock, + transfer_f transfer) +{ + snd_pcm_runtime_t *runtime = substream->runtime; + snd_pcm_uframes_t xfer = 0; + snd_pcm_uframes_t offset = 0; + int err = 0; + + if (size == 0) + return 0; + if (size > runtime->xfer_align) + size -= size % runtime->xfer_align; + + snd_pcm_stream_lock_irq(substream); + switch (runtime->status->state) { + case SNDRV_PCM_STATE_PREPARED: + case SNDRV_PCM_STATE_RUNNING: + case SNDRV_PCM_STATE_PAUSED: + break; + case SNDRV_PCM_STATE_XRUN: + err = -EPIPE; + goto _end_unlock; + case SNDRV_PCM_STATE_SUSPENDED: + err = -ESTRPIPE; + goto _end_unlock; + default: + err = -EBADFD; + goto _end_unlock; + } + + while (size > 0) { + snd_pcm_uframes_t frames, appl_ptr, appl_ofs; + snd_pcm_uframes_t avail; + snd_pcm_uframes_t cont; + if (runtime->sleep_min == 0 && runtime->status->state == SNDRV_PCM_STATE_RUNNING) + snd_pcm_update_hw_ptr(substream); + avail = snd_pcm_playback_avail(runtime); + if (((avail < runtime->control->avail_min && size > avail) || + (size >= runtime->xfer_align && avail < runtime->xfer_align))) { + wait_queue_t wait; + enum { READY, SIGNALED, ERROR, SUSPENDED, EXPIRED } state; + long tout; + + if (nonblock) { + err = -EAGAIN; + goto _end_unlock; + } + + init_waitqueue_entry(&wait, current); + add_wait_queue(&runtime->sleep, &wait); + while (1) { + if (signal_pending(current)) { + state = SIGNALED; + break; + } + set_current_state(TASK_INTERRUPTIBLE); + snd_pcm_stream_unlock_irq(substream); + tout = schedule_timeout(10 * HZ); + snd_pcm_stream_lock_irq(substream); + if (tout == 0) { + if (runtime->status->state != SNDRV_PCM_STATE_PREPARED && + runtime->status->state != SNDRV_PCM_STATE_PAUSED) { + state = runtime->status->state == SNDRV_PCM_STATE_SUSPENDED ? SUSPENDED : EXPIRED; + break; + } + } + switch (runtime->status->state) { + case SNDRV_PCM_STATE_XRUN: + case SNDRV_PCM_STATE_DRAINING: + state = ERROR; + goto _end_loop; + case SNDRV_PCM_STATE_SUSPENDED: + state = SUSPENDED; + goto _end_loop; + default: + break; + } + avail = snd_pcm_playback_avail(runtime); + if (avail >= runtime->control->avail_min) { + state = READY; + break; + } + } + _end_loop: + remove_wait_queue(&runtime->sleep, &wait); + + switch (state) { + case ERROR: + err = -EPIPE; + goto _end_unlock; + case SUSPENDED: + err = -ESTRPIPE; + goto _end_unlock; + case SIGNALED: + err = -ERESTARTSYS; + goto _end_unlock; + case EXPIRED: + snd_printd("playback write error (DMA or IRQ trouble?)\n"); + err = -EIO; + goto _end_unlock; + default: + break; + } + } + if (avail > runtime->xfer_align) + avail -= avail % runtime->xfer_align; + frames = size > avail ? avail : size; + cont = runtime->buffer_size - runtime->control->appl_ptr % runtime->buffer_size; + if (frames > cont) + frames = cont; + snd_assert(frames != 0, snd_pcm_stream_unlock_irq(substream); return -EINVAL); + appl_ptr = runtime->control->appl_ptr; + appl_ofs = appl_ptr % runtime->buffer_size; + snd_pcm_stream_unlock_irq(substream); + if ((err = transfer(substream, appl_ofs, data, offset, frames)) < 0) + goto _end; + snd_pcm_stream_lock_irq(substream); + switch (runtime->status->state) { + case SNDRV_PCM_STATE_XRUN: + err = -EPIPE; + goto _end_unlock; + case SNDRV_PCM_STATE_SUSPENDED: + err = -ESTRPIPE; + goto _end_unlock; + default: + break; + } + appl_ptr += frames; + if (appl_ptr >= runtime->boundary) + appl_ptr -= runtime->boundary; + runtime->control->appl_ptr = appl_ptr; + if (substream->ops->ack) + substream->ops->ack(substream); + + offset += frames; + size -= frames; + xfer += frames; + if (runtime->status->state == SNDRV_PCM_STATE_PREPARED && + snd_pcm_playback_hw_avail(runtime) >= (snd_pcm_sframes_t)runtime->start_threshold) { + err = snd_pcm_start(substream); + if (err < 0) + goto _end_unlock; + } + if (runtime->sleep_min && + runtime->status->state == SNDRV_PCM_STATE_RUNNING) + snd_pcm_tick_prepare(substream); + } + _end_unlock: + snd_pcm_stream_unlock_irq(substream); + _end: + return xfer > 0 ? (snd_pcm_sframes_t)xfer : err; +} + +snd_pcm_sframes_t snd_pcm_lib_write(snd_pcm_substream_t *substream, const void __user *buf, snd_pcm_uframes_t size) +{ + snd_pcm_runtime_t *runtime; + int nonblock; + + snd_assert(substream != NULL, return -ENXIO); + runtime = substream->runtime; + snd_assert(runtime != NULL, return -ENXIO); + snd_assert(substream->ops->copy != NULL || runtime->dma_area != NULL, return -EINVAL); + if (runtime->status->state == SNDRV_PCM_STATE_OPEN) + return -EBADFD; + + snd_assert(substream->ffile != NULL, return -ENXIO); + nonblock = !!(substream->ffile->f_flags & O_NONBLOCK); +#if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE) + if (substream->oss.oss) { + snd_pcm_oss_setup_t *setup = substream->oss.setup; + if (setup != NULL) { + if (setup->nonblock) + nonblock = 1; + else if (setup->block) + nonblock = 0; + } + } +#endif + + if (runtime->access != SNDRV_PCM_ACCESS_RW_INTERLEAVED && + runtime->channels > 1) + return -EINVAL; + return snd_pcm_lib_write1(substream, (unsigned long)buf, size, nonblock, + snd_pcm_lib_write_transfer); +} + +static int snd_pcm_lib_writev_transfer(snd_pcm_substream_t *substream, + unsigned int hwoff, + unsigned long data, unsigned int off, + snd_pcm_uframes_t frames) +{ + snd_pcm_runtime_t *runtime = substream->runtime; + int err; + void __user **bufs = (void __user **)data; + int channels = runtime->channels; + int c; + if (substream->ops->copy) { + snd_assert(substream->ops->silence != NULL, return -EINVAL); + for (c = 0; c < channels; ++c, ++bufs) { + if (*bufs == NULL) { + if ((err = substream->ops->silence(substream, c, hwoff, frames)) < 0) + return err; + } else { + char __user *buf = *bufs + samples_to_bytes(runtime, off); + if ((err = substream->ops->copy(substream, c, hwoff, buf, frames)) < 0) + return err; + } + } + } else { + /* default transfer behaviour */ + size_t dma_csize = runtime->dma_bytes / channels; + snd_assert(runtime->dma_area, return -EFAULT); + for (c = 0; c < channels; ++c, ++bufs) { + char *hwbuf = runtime->dma_area + (c * dma_csize) + samples_to_bytes(runtime, hwoff); + if (*bufs == NULL) { + snd_pcm_format_set_silence(runtime->format, hwbuf, frames); + } else { + char __user *buf = *bufs + samples_to_bytes(runtime, off); + if (copy_from_user(hwbuf, buf, samples_to_bytes(runtime, frames))) + return -EFAULT; + } + } + } + return 0; +} + +snd_pcm_sframes_t snd_pcm_lib_writev(snd_pcm_substream_t *substream, + void __user **bufs, + snd_pcm_uframes_t frames) +{ + snd_pcm_runtime_t *runtime; + int nonblock; + + snd_assert(substream != NULL, return -ENXIO); + runtime = substream->runtime; + snd_assert(runtime != NULL, return -ENXIO); + snd_assert(substream->ops->copy != NULL || runtime->dma_area != NULL, return -EINVAL); + if (runtime->status->state == SNDRV_PCM_STATE_OPEN) + return -EBADFD; + + snd_assert(substream->ffile != NULL, return -ENXIO); + nonblock = !!(substream->ffile->f_flags & O_NONBLOCK); +#if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE) + if (substream->oss.oss) { + snd_pcm_oss_setup_t *setup = substream->oss.setup; + if (setup != NULL) { + if (setup->nonblock) + nonblock = 1; + else if (setup->block) + nonblock = 0; + } + } +#endif + + if (runtime->access != SNDRV_PCM_ACCESS_RW_NONINTERLEAVED) + return -EINVAL; + return snd_pcm_lib_write1(substream, (unsigned long)bufs, frames, + nonblock, snd_pcm_lib_writev_transfer); +} + +static int snd_pcm_lib_read_transfer(snd_pcm_substream_t *substream, + unsigned int hwoff, + unsigned long data, unsigned int off, + snd_pcm_uframes_t frames) +{ + snd_pcm_runtime_t *runtime = substream->runtime; + int err; + char __user *buf = (char __user *) data + frames_to_bytes(runtime, off); + if (substream->ops->copy) { + if ((err = substream->ops->copy(substream, -1, hwoff, buf, frames)) < 0) + return err; + } else { + char *hwbuf = runtime->dma_area + frames_to_bytes(runtime, hwoff); + snd_assert(runtime->dma_area, return -EFAULT); + if (copy_to_user(buf, hwbuf, frames_to_bytes(runtime, frames))) + return -EFAULT; + } + return 0; +} + +static snd_pcm_sframes_t snd_pcm_lib_read1(snd_pcm_substream_t *substream, + unsigned long data, + snd_pcm_uframes_t size, + int nonblock, + transfer_f transfer) +{ + snd_pcm_runtime_t *runtime = substream->runtime; + snd_pcm_uframes_t xfer = 0; + snd_pcm_uframes_t offset = 0; + int err = 0; + + if (size == 0) + return 0; + if (size > runtime->xfer_align) + size -= size % runtime->xfer_align; + + snd_pcm_stream_lock_irq(substream); + switch (runtime->status->state) { + case SNDRV_PCM_STATE_PREPARED: + if (size >= runtime->start_threshold) { + err = snd_pcm_start(substream); + if (err < 0) + goto _end_unlock; + } + break; + case SNDRV_PCM_STATE_DRAINING: + case SNDRV_PCM_STATE_RUNNING: + case SNDRV_PCM_STATE_PAUSED: + break; + case SNDRV_PCM_STATE_XRUN: + err = -EPIPE; + goto _end_unlock; + case SNDRV_PCM_STATE_SUSPENDED: + err = -ESTRPIPE; + goto _end_unlock; + default: + err = -EBADFD; + goto _end_unlock; + } + + while (size > 0) { + snd_pcm_uframes_t frames, appl_ptr, appl_ofs; + snd_pcm_uframes_t avail; + snd_pcm_uframes_t cont; + if (runtime->sleep_min == 0 && runtime->status->state == SNDRV_PCM_STATE_RUNNING) + snd_pcm_update_hw_ptr(substream); + __draining: + avail = snd_pcm_capture_avail(runtime); + if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) { + if (avail < runtime->xfer_align) { + err = -EPIPE; + goto _end_unlock; + } + } else if ((avail < runtime->control->avail_min && size > avail) || + (size >= runtime->xfer_align && avail < runtime->xfer_align)) { + wait_queue_t wait; + enum { READY, SIGNALED, ERROR, SUSPENDED, EXPIRED } state; + long tout; + + if (nonblock) { + err = -EAGAIN; + goto _end_unlock; + } + + init_waitqueue_entry(&wait, current); + add_wait_queue(&runtime->sleep, &wait); + while (1) { + if (signal_pending(current)) { + state = SIGNALED; + break; + } + set_current_state(TASK_INTERRUPTIBLE); + snd_pcm_stream_unlock_irq(substream); + tout = schedule_timeout(10 * HZ); + snd_pcm_stream_lock_irq(substream); + if (tout == 0) { + if (runtime->status->state != SNDRV_PCM_STATE_PREPARED && + runtime->status->state != SNDRV_PCM_STATE_PAUSED) { + state = runtime->status->state == SNDRV_PCM_STATE_SUSPENDED ? SUSPENDED : EXPIRED; + break; + } + } + switch (runtime->status->state) { + case SNDRV_PCM_STATE_XRUN: + state = ERROR; + goto _end_loop; + case SNDRV_PCM_STATE_SUSPENDED: + state = SUSPENDED; + goto _end_loop; + case SNDRV_PCM_STATE_DRAINING: + goto __draining; + default: + break; + } + avail = snd_pcm_capture_avail(runtime); + if (avail >= runtime->control->avail_min) { + state = READY; + break; + } + } + _end_loop: + remove_wait_queue(&runtime->sleep, &wait); + + switch (state) { + case ERROR: + err = -EPIPE; + goto _end_unlock; + case SUSPENDED: + err = -ESTRPIPE; + goto _end_unlock; + case SIGNALED: + err = -ERESTARTSYS; + goto _end_unlock; + case EXPIRED: + snd_printd("capture read error (DMA or IRQ trouble?)\n"); + err = -EIO; + goto _end_unlock; + default: + break; + } + } + if (avail > runtime->xfer_align) + avail -= avail % runtime->xfer_align; + frames = size > avail ? avail : size; + cont = runtime->buffer_size - runtime->control->appl_ptr % runtime->buffer_size; + if (frames > cont) + frames = cont; + snd_assert(frames != 0, snd_pcm_stream_unlock_irq(substream); return -EINVAL); + appl_ptr = runtime->control->appl_ptr; + appl_ofs = appl_ptr % runtime->buffer_size; + snd_pcm_stream_unlock_irq(substream); + if ((err = transfer(substream, appl_ofs, data, offset, frames)) < 0) + goto _end; + snd_pcm_stream_lock_irq(substream); + switch (runtime->status->state) { + case SNDRV_PCM_STATE_XRUN: + err = -EPIPE; + goto _end_unlock; + case SNDRV_PCM_STATE_SUSPENDED: + err = -ESTRPIPE; + goto _end_unlock; + default: + break; + } + appl_ptr += frames; + if (appl_ptr >= runtime->boundary) + appl_ptr -= runtime->boundary; + runtime->control->appl_ptr = appl_ptr; + if (substream->ops->ack) + substream->ops->ack(substream); + + offset += frames; + size -= frames; + xfer += frames; + if (runtime->sleep_min && + runtime->status->state == SNDRV_PCM_STATE_RUNNING) + snd_pcm_tick_prepare(substream); + } + _end_unlock: + snd_pcm_stream_unlock_irq(substream); + _end: + return xfer > 0 ? (snd_pcm_sframes_t)xfer : err; +} + +snd_pcm_sframes_t snd_pcm_lib_read(snd_pcm_substream_t *substream, void __user *buf, snd_pcm_uframes_t size) +{ + snd_pcm_runtime_t *runtime; + int nonblock; + + snd_assert(substream != NULL, return -ENXIO); + runtime = substream->runtime; + snd_assert(runtime != NULL, return -ENXIO); + snd_assert(substream->ops->copy != NULL || runtime->dma_area != NULL, return -EINVAL); + if (runtime->status->state == SNDRV_PCM_STATE_OPEN) + return -EBADFD; + + snd_assert(substream->ffile != NULL, return -ENXIO); + nonblock = !!(substream->ffile->f_flags & O_NONBLOCK); +#if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE) + if (substream->oss.oss) { + snd_pcm_oss_setup_t *setup = substream->oss.setup; + if (setup != NULL) { + if (setup->nonblock) + nonblock = 1; + else if (setup->block) + nonblock = 0; + } + } +#endif + if (runtime->access != SNDRV_PCM_ACCESS_RW_INTERLEAVED) + return -EINVAL; + return snd_pcm_lib_read1(substream, (unsigned long)buf, size, nonblock, snd_pcm_lib_read_transfer); +} + +static int snd_pcm_lib_readv_transfer(snd_pcm_substream_t *substream, + unsigned int hwoff, + unsigned long data, unsigned int off, + snd_pcm_uframes_t frames) +{ + snd_pcm_runtime_t *runtime = substream->runtime; + int err; + void __user **bufs = (void __user **)data; + int channels = runtime->channels; + int c; + if (substream->ops->copy) { + for (c = 0; c < channels; ++c, ++bufs) { + char __user *buf; + if (*bufs == NULL) + continue; + buf = *bufs + samples_to_bytes(runtime, off); + if ((err = substream->ops->copy(substream, c, hwoff, buf, frames)) < 0) + return err; + } + } else { + snd_pcm_uframes_t dma_csize = runtime->dma_bytes / channels; + snd_assert(runtime->dma_area, return -EFAULT); + for (c = 0; c < channels; ++c, ++bufs) { + char *hwbuf; + char __user *buf; + if (*bufs == NULL) + continue; + + hwbuf = runtime->dma_area + (c * dma_csize) + samples_to_bytes(runtime, hwoff); + buf = *bufs + samples_to_bytes(runtime, off); + if (copy_to_user(buf, hwbuf, samples_to_bytes(runtime, frames))) + return -EFAULT; + } + } + return 0; +} + +snd_pcm_sframes_t snd_pcm_lib_readv(snd_pcm_substream_t *substream, + void __user **bufs, + snd_pcm_uframes_t frames) +{ + snd_pcm_runtime_t *runtime; + int nonblock; + + snd_assert(substream != NULL, return -ENXIO); + runtime = substream->runtime; + snd_assert(runtime != NULL, return -ENXIO); + snd_assert(substream->ops->copy != NULL || runtime->dma_area != NULL, return -EINVAL); + if (runtime->status->state == SNDRV_PCM_STATE_OPEN) + return -EBADFD; + + snd_assert(substream->ffile != NULL, return -ENXIO); + nonblock = !!(substream->ffile->f_flags & O_NONBLOCK); +#if defined(CONFIG_SND_PCM_OSS) || defined(CONFIG_SND_PCM_OSS_MODULE) + if (substream->oss.oss) { + snd_pcm_oss_setup_t *setup = substream->oss.setup; + if (setup != NULL) { + if (setup->nonblock) + nonblock = 1; + else if (setup->block) + nonblock = 0; + } + } +#endif + + if (runtime->access != SNDRV_PCM_ACCESS_RW_NONINTERLEAVED) + return -EINVAL; + return snd_pcm_lib_read1(substream, (unsigned long)bufs, frames, nonblock, snd_pcm_lib_readv_transfer); +} + +/* + * Exported symbols + */ + +EXPORT_SYMBOL(snd_interval_refine); +EXPORT_SYMBOL(snd_interval_list); +EXPORT_SYMBOL(snd_interval_ratnum); +EXPORT_SYMBOL(snd_interval_muldivk); +EXPORT_SYMBOL(snd_interval_mulkdiv); +EXPORT_SYMBOL(snd_interval_div); +EXPORT_SYMBOL(_snd_pcm_hw_params_any); +EXPORT_SYMBOL(_snd_pcm_hw_param_min); +EXPORT_SYMBOL(_snd_pcm_hw_param_set); +EXPORT_SYMBOL(_snd_pcm_hw_param_setempty); +EXPORT_SYMBOL(_snd_pcm_hw_param_setinteger); +EXPORT_SYMBOL(snd_pcm_hw_param_value_min); +EXPORT_SYMBOL(snd_pcm_hw_param_value_max); +EXPORT_SYMBOL(snd_pcm_hw_param_mask); +EXPORT_SYMBOL(snd_pcm_hw_param_first); +EXPORT_SYMBOL(snd_pcm_hw_param_last); +EXPORT_SYMBOL(snd_pcm_hw_param_near); +EXPORT_SYMBOL(snd_pcm_hw_param_set); +EXPORT_SYMBOL(snd_pcm_hw_refine); +EXPORT_SYMBOL(snd_pcm_hw_params); +EXPORT_SYMBOL(snd_pcm_hw_constraints_init); +EXPORT_SYMBOL(snd_pcm_hw_constraints_complete); +EXPORT_SYMBOL(snd_pcm_hw_constraint_list); +EXPORT_SYMBOL(snd_pcm_hw_constraint_step); +EXPORT_SYMBOL(snd_pcm_hw_constraint_ratnums); +EXPORT_SYMBOL(snd_pcm_hw_constraint_ratdens); +EXPORT_SYMBOL(snd_pcm_hw_constraint_msbits); +EXPORT_SYMBOL(snd_pcm_hw_constraint_minmax); +EXPORT_SYMBOL(snd_pcm_hw_constraint_integer); +EXPORT_SYMBOL(snd_pcm_hw_constraint_pow2); +EXPORT_SYMBOL(snd_pcm_hw_rule_add); +EXPORT_SYMBOL(snd_pcm_set_ops); +EXPORT_SYMBOL(snd_pcm_set_sync); +EXPORT_SYMBOL(snd_pcm_lib_ioctl); +EXPORT_SYMBOL(snd_pcm_stop); +EXPORT_SYMBOL(snd_pcm_period_elapsed); +EXPORT_SYMBOL(snd_pcm_lib_write); +EXPORT_SYMBOL(snd_pcm_lib_read); +EXPORT_SYMBOL(snd_pcm_lib_writev); +EXPORT_SYMBOL(snd_pcm_lib_readv); +EXPORT_SYMBOL(snd_pcm_lib_buffer_bytes); +EXPORT_SYMBOL(snd_pcm_lib_period_bytes); +/* pcm_memory.c */ +EXPORT_SYMBOL(snd_pcm_lib_preallocate_free_for_all); +EXPORT_SYMBOL(snd_pcm_lib_preallocate_pages); +EXPORT_SYMBOL(snd_pcm_lib_preallocate_pages_for_all); +EXPORT_SYMBOL(snd_pcm_sgbuf_ops_page); +EXPORT_SYMBOL(snd_pcm_lib_malloc_pages); +EXPORT_SYMBOL(snd_pcm_lib_free_pages); |