![Pierre-Louis Bossart](/assets/img/avatar_default.png)
Group read of hw_ptr, tstamp and jiffies in a sequence for better correlation. Previous code took timestamp at the end, which could introduce delays between audio time and system time. Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com> Signed-off-by: Takashi Iwai <tiwai@suse.de>
2305 lines
62 KiB
C
2305 lines
62 KiB
C
/*
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* Digital Audio (PCM) abstract layer
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* Copyright (c) by Jaroslav Kysela <perex@perex.cz>
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* Abramo Bagnara <abramo@alsa-project.org>
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*
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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#include <linux/slab.h>
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#include <linux/time.h>
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#include <linux/math64.h>
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#include <linux/export.h>
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#include <sound/core.h>
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#include <sound/control.h>
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#include <sound/info.h>
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#include <sound/pcm.h>
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#include <sound/pcm_params.h>
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#include <sound/timer.h>
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/*
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* fill ring buffer with silence
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* runtime->silence_start: starting pointer to silence area
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* runtime->silence_filled: size filled with silence
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* runtime->silence_threshold: threshold from application
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* runtime->silence_size: maximal size from application
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*
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* when runtime->silence_size >= runtime->boundary - fill processed area with silence immediately
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*/
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void snd_pcm_playback_silence(struct snd_pcm_substream *substream, snd_pcm_uframes_t new_hw_ptr)
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{
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struct snd_pcm_runtime *runtime = substream->runtime;
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snd_pcm_uframes_t frames, ofs, transfer;
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if (runtime->silence_size < runtime->boundary) {
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snd_pcm_sframes_t noise_dist, n;
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if (runtime->silence_start != runtime->control->appl_ptr) {
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n = runtime->control->appl_ptr - runtime->silence_start;
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if (n < 0)
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n += runtime->boundary;
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if ((snd_pcm_uframes_t)n < runtime->silence_filled)
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runtime->silence_filled -= n;
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else
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runtime->silence_filled = 0;
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runtime->silence_start = runtime->control->appl_ptr;
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}
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if (runtime->silence_filled >= runtime->buffer_size)
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return;
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noise_dist = snd_pcm_playback_hw_avail(runtime) + runtime->silence_filled;
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if (noise_dist >= (snd_pcm_sframes_t) runtime->silence_threshold)
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return;
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frames = runtime->silence_threshold - noise_dist;
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if (frames > runtime->silence_size)
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frames = runtime->silence_size;
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} else {
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if (new_hw_ptr == ULONG_MAX) { /* initialization */
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snd_pcm_sframes_t avail = snd_pcm_playback_hw_avail(runtime);
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if (avail > runtime->buffer_size)
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avail = runtime->buffer_size;
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runtime->silence_filled = avail > 0 ? avail : 0;
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runtime->silence_start = (runtime->status->hw_ptr +
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runtime->silence_filled) %
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runtime->boundary;
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} else {
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ofs = runtime->status->hw_ptr;
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frames = new_hw_ptr - ofs;
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if ((snd_pcm_sframes_t)frames < 0)
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frames += runtime->boundary;
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runtime->silence_filled -= frames;
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if ((snd_pcm_sframes_t)runtime->silence_filled < 0) {
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runtime->silence_filled = 0;
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runtime->silence_start = new_hw_ptr;
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} else {
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runtime->silence_start = ofs;
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}
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}
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frames = runtime->buffer_size - runtime->silence_filled;
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}
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if (snd_BUG_ON(frames > runtime->buffer_size))
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return;
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if (frames == 0)
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return;
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ofs = runtime->silence_start % runtime->buffer_size;
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while (frames > 0) {
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transfer = ofs + frames > runtime->buffer_size ? runtime->buffer_size - ofs : frames;
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if (runtime->access == SNDRV_PCM_ACCESS_RW_INTERLEAVED ||
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runtime->access == SNDRV_PCM_ACCESS_MMAP_INTERLEAVED) {
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if (substream->ops->silence) {
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int err;
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err = substream->ops->silence(substream, -1, ofs, transfer);
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snd_BUG_ON(err < 0);
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} else {
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char *hwbuf = runtime->dma_area + frames_to_bytes(runtime, ofs);
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snd_pcm_format_set_silence(runtime->format, hwbuf, transfer * runtime->channels);
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}
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} else {
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unsigned int c;
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unsigned int channels = runtime->channels;
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if (substream->ops->silence) {
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for (c = 0; c < channels; ++c) {
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int err;
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err = substream->ops->silence(substream, c, ofs, transfer);
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snd_BUG_ON(err < 0);
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}
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} else {
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size_t dma_csize = runtime->dma_bytes / channels;
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for (c = 0; c < channels; ++c) {
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char *hwbuf = runtime->dma_area + (c * dma_csize) + samples_to_bytes(runtime, ofs);
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snd_pcm_format_set_silence(runtime->format, hwbuf, transfer);
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}
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}
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}
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runtime->silence_filled += transfer;
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frames -= transfer;
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ofs = 0;
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}
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}
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#ifdef CONFIG_SND_DEBUG
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void snd_pcm_debug_name(struct snd_pcm_substream *substream,
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char *name, size_t len)
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{
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snprintf(name, len, "pcmC%dD%d%c:%d",
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substream->pcm->card->number,
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substream->pcm->device,
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substream->stream ? 'c' : 'p',
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substream->number);
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}
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EXPORT_SYMBOL(snd_pcm_debug_name);
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#endif
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#define XRUN_DEBUG_BASIC (1<<0)
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#define XRUN_DEBUG_STACK (1<<1) /* dump also stack */
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#define XRUN_DEBUG_JIFFIESCHECK (1<<2) /* do jiffies check */
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#define XRUN_DEBUG_PERIODUPDATE (1<<3) /* full period update info */
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#define XRUN_DEBUG_HWPTRUPDATE (1<<4) /* full hwptr update info */
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#define XRUN_DEBUG_LOG (1<<5) /* show last 10 positions on err */
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#define XRUN_DEBUG_LOGONCE (1<<6) /* do above only once */
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#ifdef CONFIG_SND_PCM_XRUN_DEBUG
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#define xrun_debug(substream, mask) \
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((substream)->pstr->xrun_debug & (mask))
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#else
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#define xrun_debug(substream, mask) 0
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#endif
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#define dump_stack_on_xrun(substream) do { \
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if (xrun_debug(substream, XRUN_DEBUG_STACK)) \
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dump_stack(); \
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} while (0)
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static void xrun(struct snd_pcm_substream *substream)
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{
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struct snd_pcm_runtime *runtime = substream->runtime;
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if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE)
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snd_pcm_gettime(runtime, (struct timespec *)&runtime->status->tstamp);
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snd_pcm_stop(substream, SNDRV_PCM_STATE_XRUN);
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if (xrun_debug(substream, XRUN_DEBUG_BASIC)) {
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char name[16];
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snd_pcm_debug_name(substream, name, sizeof(name));
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snd_printd(KERN_DEBUG "XRUN: %s\n", name);
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dump_stack_on_xrun(substream);
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}
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}
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#ifdef CONFIG_SND_PCM_XRUN_DEBUG
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#define hw_ptr_error(substream, fmt, args...) \
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do { \
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if (xrun_debug(substream, XRUN_DEBUG_BASIC)) { \
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xrun_log_show(substream); \
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if (printk_ratelimit()) { \
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snd_printd("PCM: " fmt, ##args); \
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} \
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dump_stack_on_xrun(substream); \
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} \
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} while (0)
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#define XRUN_LOG_CNT 10
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struct hwptr_log_entry {
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unsigned int in_interrupt;
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unsigned long jiffies;
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snd_pcm_uframes_t pos;
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snd_pcm_uframes_t period_size;
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snd_pcm_uframes_t buffer_size;
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snd_pcm_uframes_t old_hw_ptr;
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snd_pcm_uframes_t hw_ptr_base;
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};
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struct snd_pcm_hwptr_log {
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unsigned int idx;
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unsigned int hit: 1;
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struct hwptr_log_entry entries[XRUN_LOG_CNT];
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};
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static void xrun_log(struct snd_pcm_substream *substream,
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snd_pcm_uframes_t pos, int in_interrupt)
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{
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struct snd_pcm_runtime *runtime = substream->runtime;
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struct snd_pcm_hwptr_log *log = runtime->hwptr_log;
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struct hwptr_log_entry *entry;
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if (log == NULL) {
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log = kzalloc(sizeof(*log), GFP_ATOMIC);
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if (log == NULL)
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return;
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runtime->hwptr_log = log;
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} else {
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if (xrun_debug(substream, XRUN_DEBUG_LOGONCE) && log->hit)
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return;
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}
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entry = &log->entries[log->idx];
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entry->in_interrupt = in_interrupt;
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entry->jiffies = jiffies;
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entry->pos = pos;
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entry->period_size = runtime->period_size;
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entry->buffer_size = runtime->buffer_size;
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entry->old_hw_ptr = runtime->status->hw_ptr;
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entry->hw_ptr_base = runtime->hw_ptr_base;
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log->idx = (log->idx + 1) % XRUN_LOG_CNT;
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}
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static void xrun_log_show(struct snd_pcm_substream *substream)
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{
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struct snd_pcm_hwptr_log *log = substream->runtime->hwptr_log;
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struct hwptr_log_entry *entry;
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char name[16];
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unsigned int idx;
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int cnt;
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if (log == NULL)
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return;
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if (xrun_debug(substream, XRUN_DEBUG_LOGONCE) && log->hit)
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return;
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snd_pcm_debug_name(substream, name, sizeof(name));
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for (cnt = 0, idx = log->idx; cnt < XRUN_LOG_CNT; cnt++) {
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entry = &log->entries[idx];
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if (entry->period_size == 0)
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break;
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snd_printd("hwptr log: %s: %sj=%lu, pos=%ld/%ld/%ld, "
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"hwptr=%ld/%ld\n",
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name, entry->in_interrupt ? "[Q] " : "",
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entry->jiffies,
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(unsigned long)entry->pos,
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(unsigned long)entry->period_size,
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(unsigned long)entry->buffer_size,
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(unsigned long)entry->old_hw_ptr,
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(unsigned long)entry->hw_ptr_base);
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idx++;
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idx %= XRUN_LOG_CNT;
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}
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log->hit = 1;
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}
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#else /* ! CONFIG_SND_PCM_XRUN_DEBUG */
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#define hw_ptr_error(substream, fmt, args...) do { } while (0)
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#define xrun_log(substream, pos, in_interrupt) do { } while (0)
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#define xrun_log_show(substream) do { } while (0)
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#endif
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int snd_pcm_update_state(struct snd_pcm_substream *substream,
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struct snd_pcm_runtime *runtime)
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{
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snd_pcm_uframes_t avail;
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if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
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avail = snd_pcm_playback_avail(runtime);
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else
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avail = snd_pcm_capture_avail(runtime);
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if (avail > runtime->avail_max)
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runtime->avail_max = avail;
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if (runtime->status->state == SNDRV_PCM_STATE_DRAINING) {
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if (avail >= runtime->buffer_size) {
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snd_pcm_drain_done(substream);
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return -EPIPE;
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}
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} else {
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if (avail >= runtime->stop_threshold) {
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xrun(substream);
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return -EPIPE;
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}
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}
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if (runtime->twake) {
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if (avail >= runtime->twake)
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wake_up(&runtime->tsleep);
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} else if (avail >= runtime->control->avail_min)
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wake_up(&runtime->sleep);
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return 0;
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}
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static int snd_pcm_update_hw_ptr0(struct snd_pcm_substream *substream,
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unsigned int in_interrupt)
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{
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struct snd_pcm_runtime *runtime = substream->runtime;
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snd_pcm_uframes_t pos;
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snd_pcm_uframes_t old_hw_ptr, new_hw_ptr, hw_base;
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snd_pcm_sframes_t hdelta, delta;
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unsigned long jdelta;
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unsigned long curr_jiffies;
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struct timespec curr_tstamp;
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old_hw_ptr = runtime->status->hw_ptr;
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/*
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* group pointer, time and jiffies reads to allow for more
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* accurate correlations/corrections.
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* The values are stored at the end of this routine after
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* corrections for hw_ptr position
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*/
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pos = substream->ops->pointer(substream);
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curr_jiffies = jiffies;
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if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE)
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snd_pcm_gettime(runtime, (struct timespec *)&curr_tstamp);
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if (pos == SNDRV_PCM_POS_XRUN) {
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xrun(substream);
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return -EPIPE;
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}
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if (pos >= runtime->buffer_size) {
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if (printk_ratelimit()) {
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char name[16];
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snd_pcm_debug_name(substream, name, sizeof(name));
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xrun_log_show(substream);
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snd_printd(KERN_ERR "BUG: %s, pos = %ld, "
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"buffer size = %ld, period size = %ld\n",
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name, pos, runtime->buffer_size,
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runtime->period_size);
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}
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pos = 0;
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}
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pos -= pos % runtime->min_align;
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if (xrun_debug(substream, XRUN_DEBUG_LOG))
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xrun_log(substream, pos, in_interrupt);
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hw_base = runtime->hw_ptr_base;
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new_hw_ptr = hw_base + pos;
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if (in_interrupt) {
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/* we know that one period was processed */
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/* delta = "expected next hw_ptr" for in_interrupt != 0 */
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delta = runtime->hw_ptr_interrupt + runtime->period_size;
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if (delta > new_hw_ptr) {
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/* check for double acknowledged interrupts */
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hdelta = curr_jiffies - runtime->hw_ptr_jiffies;
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if (hdelta > runtime->hw_ptr_buffer_jiffies/2) {
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hw_base += runtime->buffer_size;
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if (hw_base >= runtime->boundary)
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hw_base = 0;
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new_hw_ptr = hw_base + pos;
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goto __delta;
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}
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}
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}
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/* new_hw_ptr might be lower than old_hw_ptr in case when */
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/* pointer crosses the end of the ring buffer */
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if (new_hw_ptr < old_hw_ptr) {
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hw_base += runtime->buffer_size;
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if (hw_base >= runtime->boundary)
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hw_base = 0;
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new_hw_ptr = hw_base + pos;
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}
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__delta:
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delta = new_hw_ptr - old_hw_ptr;
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if (delta < 0)
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delta += runtime->boundary;
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if (xrun_debug(substream, in_interrupt ?
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XRUN_DEBUG_PERIODUPDATE : XRUN_DEBUG_HWPTRUPDATE)) {
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char name[16];
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snd_pcm_debug_name(substream, name, sizeof(name));
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snd_printd("%s_update: %s: pos=%u/%u/%u, "
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"hwptr=%ld/%ld/%ld/%ld\n",
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in_interrupt ? "period" : "hwptr",
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name,
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(unsigned int)pos,
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(unsigned int)runtime->period_size,
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(unsigned int)runtime->buffer_size,
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(unsigned long)delta,
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(unsigned long)old_hw_ptr,
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(unsigned long)new_hw_ptr,
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(unsigned long)runtime->hw_ptr_base);
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}
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if (runtime->no_period_wakeup) {
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snd_pcm_sframes_t xrun_threshold;
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/*
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* Without regular period interrupts, we have to check
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* the elapsed time to detect xruns.
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*/
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jdelta = curr_jiffies - runtime->hw_ptr_jiffies;
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if (jdelta < runtime->hw_ptr_buffer_jiffies / 2)
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goto no_delta_check;
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hdelta = jdelta - delta * HZ / runtime->rate;
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xrun_threshold = runtime->hw_ptr_buffer_jiffies / 2 + 1;
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while (hdelta > xrun_threshold) {
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delta += runtime->buffer_size;
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hw_base += runtime->buffer_size;
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if (hw_base >= runtime->boundary)
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hw_base = 0;
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new_hw_ptr = hw_base + pos;
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hdelta -= runtime->hw_ptr_buffer_jiffies;
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}
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goto no_delta_check;
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}
|
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|
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/* something must be really wrong */
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if (delta >= runtime->buffer_size + runtime->period_size) {
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hw_ptr_error(substream,
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"Unexpected hw_pointer value %s"
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"(stream=%i, pos=%ld, new_hw_ptr=%ld, "
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"old_hw_ptr=%ld)\n",
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in_interrupt ? "[Q] " : "[P]",
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substream->stream, (long)pos,
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(long)new_hw_ptr, (long)old_hw_ptr);
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return 0;
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}
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/* Do jiffies check only in xrun_debug mode */
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if (!xrun_debug(substream, XRUN_DEBUG_JIFFIESCHECK))
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goto no_jiffies_check;
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|
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/* Skip the jiffies check for hardwares with BATCH flag.
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* Such hardware usually just increases the position at each IRQ,
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* thus it can't give any strange position.
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*/
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if (runtime->hw.info & SNDRV_PCM_INFO_BATCH)
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goto no_jiffies_check;
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hdelta = delta;
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if (hdelta < runtime->delay)
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goto no_jiffies_check;
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hdelta -= runtime->delay;
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jdelta = curr_jiffies - runtime->hw_ptr_jiffies;
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if (((hdelta * HZ) / runtime->rate) > jdelta + HZ/100) {
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delta = jdelta /
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(((runtime->period_size * HZ) / runtime->rate)
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+ HZ/100);
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/* move new_hw_ptr according jiffies not pos variable */
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new_hw_ptr = old_hw_ptr;
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hw_base = delta;
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/* use loop to avoid checks for delta overflows */
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/* the delta value is small or zero in most cases */
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while (delta > 0) {
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new_hw_ptr += runtime->period_size;
|
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if (new_hw_ptr >= runtime->boundary)
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new_hw_ptr -= runtime->boundary;
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|
delta--;
|
|
}
|
|
/* align hw_base to buffer_size */
|
|
hw_ptr_error(substream,
|
|
"hw_ptr skipping! %s"
|
|
"(pos=%ld, delta=%ld, period=%ld, "
|
|
"jdelta=%lu/%lu/%lu, hw_ptr=%ld/%ld)\n",
|
|
in_interrupt ? "[Q] " : "",
|
|
(long)pos, (long)hdelta,
|
|
(long)runtime->period_size, jdelta,
|
|
((hdelta * HZ) / runtime->rate), hw_base,
|
|
(unsigned long)old_hw_ptr,
|
|
(unsigned long)new_hw_ptr);
|
|
/* reset values to proper state */
|
|
delta = 0;
|
|
hw_base = new_hw_ptr - (new_hw_ptr % runtime->buffer_size);
|
|
}
|
|
no_jiffies_check:
|
|
if (delta > runtime->period_size + runtime->period_size / 2) {
|
|
hw_ptr_error(substream,
|
|
"Lost interrupts? %s"
|
|
"(stream=%i, delta=%ld, new_hw_ptr=%ld, "
|
|
"old_hw_ptr=%ld)\n",
|
|
in_interrupt ? "[Q] " : "",
|
|
substream->stream, (long)delta,
|
|
(long)new_hw_ptr,
|
|
(long)old_hw_ptr);
|
|
}
|
|
|
|
no_delta_check:
|
|
if (runtime->status->hw_ptr == new_hw_ptr)
|
|
return 0;
|
|
|
|
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK &&
|
|
runtime->silence_size > 0)
|
|
snd_pcm_playback_silence(substream, new_hw_ptr);
|
|
|
|
if (in_interrupt) {
|
|
delta = new_hw_ptr - runtime->hw_ptr_interrupt;
|
|
if (delta < 0)
|
|
delta += runtime->boundary;
|
|
delta -= (snd_pcm_uframes_t)delta % runtime->period_size;
|
|
runtime->hw_ptr_interrupt += delta;
|
|
if (runtime->hw_ptr_interrupt >= runtime->boundary)
|
|
runtime->hw_ptr_interrupt -= runtime->boundary;
|
|
}
|
|
runtime->hw_ptr_base = hw_base;
|
|
runtime->status->hw_ptr = new_hw_ptr;
|
|
runtime->hw_ptr_jiffies = curr_jiffies;
|
|
if (runtime->tstamp_mode == SNDRV_PCM_TSTAMP_ENABLE)
|
|
runtime->status->tstamp = curr_tstamp;
|
|
|
|
return snd_pcm_update_state(substream, runtime);
|
|
}
|
|
|
|
/* CAUTION: call it with irq disabled */
|
|
int snd_pcm_update_hw_ptr(struct snd_pcm_substream *substream)
|
|
{
|
|
return snd_pcm_update_hw_ptr0(substream, 0);
|
|
}
|
|
|
|
/**
|
|
* snd_pcm_set_ops - set the PCM operators
|
|
* @pcm: the pcm instance
|
|
* @direction: stream direction, SNDRV_PCM_STREAM_XXX
|
|
* @ops: the operator table
|
|
*
|
|
* Sets the given PCM operators to the pcm instance.
|
|
*/
|
|
void snd_pcm_set_ops(struct snd_pcm *pcm, int direction, struct snd_pcm_ops *ops)
|
|
{
|
|
struct snd_pcm_str *stream = &pcm->streams[direction];
|
|
struct snd_pcm_substream *substream;
|
|
|
|
for (substream = stream->substream; substream != NULL; substream = substream->next)
|
|
substream->ops = ops;
|
|
}
|
|
|
|
EXPORT_SYMBOL(snd_pcm_set_ops);
|
|
|
|
/**
|
|
* snd_pcm_sync - set the PCM sync id
|
|
* @substream: the pcm substream
|
|
*
|
|
* Sets the PCM sync identifier for the card.
|
|
*/
|
|
void snd_pcm_set_sync(struct snd_pcm_substream *substream)
|
|
{
|
|
struct snd_pcm_runtime *runtime = substream->runtime;
|
|
|
|
runtime->sync.id32[0] = substream->pcm->card->number;
|
|
runtime->sync.id32[1] = -1;
|
|
runtime->sync.id32[2] = -1;
|
|
runtime->sync.id32[3] = -1;
|
|
}
|
|
|
|
EXPORT_SYMBOL(snd_pcm_set_sync);
|
|
|
|
/*
|
|
* Standard ioctl routine
|
|
*/
|
|
|
|
static inline unsigned int div32(unsigned int a, unsigned int b,
|
|
unsigned int *r)
|
|
{
|
|
if (b == 0) {
|
|
*r = 0;
|
|
return UINT_MAX;
|
|
}
|
|
*r = a % b;
|
|
return a / b;
|
|
}
|
|
|
|
static inline unsigned int div_down(unsigned int a, unsigned int b)
|
|
{
|
|
if (b == 0)
|
|
return UINT_MAX;
|
|
return a / b;
|
|
}
|
|
|
|
static inline unsigned int div_up(unsigned int a, unsigned int b)
|
|
{
|
|
unsigned int r;
|
|
unsigned int q;
|
|
if (b == 0)
|
|
return UINT_MAX;
|
|
q = div32(a, b, &r);
|
|
if (r)
|
|
++q;
|
|
return q;
|
|
}
|
|
|
|
static inline unsigned int mul(unsigned int a, unsigned int b)
|
|
{
|
|
if (a == 0)
|
|
return 0;
|
|
if (div_down(UINT_MAX, a) < b)
|
|
return UINT_MAX;
|
|
return a * b;
|
|
}
|
|
|
|
static inline unsigned int muldiv32(unsigned int a, unsigned int b,
|
|
unsigned int c, unsigned int *r)
|
|
{
|
|
u_int64_t n = (u_int64_t) a * b;
|
|
if (c == 0) {
|
|
snd_BUG_ON(!n);
|
|
*r = 0;
|
|
return UINT_MAX;
|
|
}
|
|
n = div_u64_rem(n, c, r);
|
|
if (n >= UINT_MAX) {
|
|
*r = 0;
|
|
return UINT_MAX;
|
|
}
|
|
return n;
|
|
}
|
|
|
|
/**
|
|
* snd_interval_refine - refine the interval value of configurator
|
|
* @i: the interval value to refine
|
|
* @v: the interval value to refer to
|
|
*
|
|
* Refines the interval value with the reference value.
|
|
* The interval is changed to the range satisfying both intervals.
|
|
* The interval status (min, max, integer, etc.) are evaluated.
|
|
*
|
|
* Returns non-zero if the value is changed, zero if not changed.
|
|
*/
|
|
int snd_interval_refine(struct snd_interval *i, const struct snd_interval *v)
|
|
{
|
|
int changed = 0;
|
|
if (snd_BUG_ON(snd_interval_empty(i)))
|
|
return -EINVAL;
|
|
if (i->min < v->min) {
|
|
i->min = v->min;
|
|
i->openmin = v->openmin;
|
|
changed = 1;
|
|
} else if (i->min == v->min && !i->openmin && v->openmin) {
|
|
i->openmin = 1;
|
|
changed = 1;
|
|
}
|
|
if (i->max > v->max) {
|
|
i->max = v->max;
|
|
i->openmax = v->openmax;
|
|
changed = 1;
|
|
} else if (i->max == v->max && !i->openmax && v->openmax) {
|
|
i->openmax = 1;
|
|
changed = 1;
|
|
}
|
|
if (!i->integer && v->integer) {
|
|
i->integer = 1;
|
|
changed = 1;
|
|
}
|
|
if (i->integer) {
|
|
if (i->openmin) {
|
|
i->min++;
|
|
i->openmin = 0;
|
|
}
|
|
if (i->openmax) {
|
|
i->max--;
|
|
i->openmax = 0;
|
|
}
|
|
} else if (!i->openmin && !i->openmax && i->min == i->max)
|
|
i->integer = 1;
|
|
if (snd_interval_checkempty(i)) {
|
|
snd_interval_none(i);
|
|
return -EINVAL;
|
|
}
|
|
return changed;
|
|
}
|
|
|
|
EXPORT_SYMBOL(snd_interval_refine);
|
|
|
|
static int snd_interval_refine_first(struct snd_interval *i)
|
|
{
|
|
if (snd_BUG_ON(snd_interval_empty(i)))
|
|
return -EINVAL;
|
|
if (snd_interval_single(i))
|
|
return 0;
|
|
i->max = i->min;
|
|
i->openmax = i->openmin;
|
|
if (i->openmax)
|
|
i->max++;
|
|
return 1;
|
|
}
|
|
|
|
static int snd_interval_refine_last(struct snd_interval *i)
|
|
{
|
|
if (snd_BUG_ON(snd_interval_empty(i)))
|
|
return -EINVAL;
|
|
if (snd_interval_single(i))
|
|
return 0;
|
|
i->min = i->max;
|
|
i->openmin = i->openmax;
|
|
if (i->openmin)
|
|
i->min--;
|
|
return 1;
|
|
}
|
|
|
|
void snd_interval_mul(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c)
|
|
{
|
|
if (a->empty || b->empty) {
|
|
snd_interval_none(c);
|
|
return;
|
|
}
|
|
c->empty = 0;
|
|
c->min = mul(a->min, b->min);
|
|
c->openmin = (a->openmin || b->openmin);
|
|
c->max = mul(a->max, b->max);
|
|
c->openmax = (a->openmax || b->openmax);
|
|
c->integer = (a->integer && b->integer);
|
|
}
|
|
|
|
/**
|
|
* snd_interval_div - refine the interval value with division
|
|
* @a: dividend
|
|
* @b: divisor
|
|
* @c: quotient
|
|
*
|
|
* c = a / b
|
|
*
|
|
* Returns non-zero if the value is changed, zero if not changed.
|
|
*/
|
|
void snd_interval_div(const struct snd_interval *a, const struct snd_interval *b, struct snd_interval *c)
|
|
{
|
|
unsigned int r;
|
|
if (a->empty || b->empty) {
|
|
snd_interval_none(c);
|
|
return;
|
|
}
|
|
c->empty = 0;
|
|
c->min = div32(a->min, b->max, &r);
|
|
c->openmin = (r || a->openmin || b->openmax);
|
|
if (b->min > 0) {
|
|
c->max = div32(a->max, b->min, &r);
|
|
if (r) {
|
|
c->max++;
|
|
c->openmax = 1;
|
|
} else
|
|
c->openmax = (a->openmax || b->openmin);
|
|
} else {
|
|
c->max = UINT_MAX;
|
|
c->openmax = 0;
|
|
}
|
|
c->integer = 0;
|
|
}
|
|
|
|
/**
|
|
* snd_interval_muldivk - refine the interval value
|
|
* @a: dividend 1
|
|
* @b: dividend 2
|
|
* @k: divisor (as integer)
|
|
* @c: result
|
|
*
|
|
* c = a * b / k
|
|
*
|
|
* Returns non-zero if the value is changed, zero if not changed.
|
|
*/
|
|
void snd_interval_muldivk(const struct snd_interval *a, const struct snd_interval *b,
|
|
unsigned int k, struct snd_interval *c)
|
|
{
|
|
unsigned int r;
|
|
if (a->empty || b->empty) {
|
|
snd_interval_none(c);
|
|
return;
|
|
}
|
|
c->empty = 0;
|
|
c->min = muldiv32(a->min, b->min, k, &r);
|
|
c->openmin = (r || a->openmin || b->openmin);
|
|
c->max = muldiv32(a->max, b->max, k, &r);
|
|
if (r) {
|
|
c->max++;
|
|
c->openmax = 1;
|
|
} else
|
|
c->openmax = (a->openmax || b->openmax);
|
|
c->integer = 0;
|
|
}
|
|
|
|
/**
|
|
* snd_interval_mulkdiv - refine the interval value
|
|
* @a: dividend 1
|
|
* @k: dividend 2 (as integer)
|
|
* @b: divisor
|
|
* @c: result
|
|
*
|
|
* c = a * k / b
|
|
*
|
|
* Returns non-zero if the value is changed, zero if not changed.
|
|
*/
|
|
void snd_interval_mulkdiv(const struct snd_interval *a, unsigned int k,
|
|
const struct snd_interval *b, struct snd_interval *c)
|
|
{
|
|
unsigned int r;
|
|
if (a->empty || b->empty) {
|
|
snd_interval_none(c);
|
|
return;
|
|
}
|
|
c->empty = 0;
|
|
c->min = muldiv32(a->min, k, b->max, &r);
|
|
c->openmin = (r || a->openmin || b->openmax);
|
|
if (b->min > 0) {
|
|
c->max = muldiv32(a->max, k, b->min, &r);
|
|
if (r) {
|
|
c->max++;
|
|
c->openmax = 1;
|
|
} else
|
|
c->openmax = (a->openmax || b->openmin);
|
|
} else {
|
|
c->max = UINT_MAX;
|
|
c->openmax = 0;
|
|
}
|
|
c->integer = 0;
|
|
}
|
|
|
|
/* ---- */
|
|
|
|
|
|
/**
|
|
* snd_interval_ratnum - refine the interval value
|
|
* @i: interval to refine
|
|
* @rats_count: number of ratnum_t
|
|
* @rats: ratnum_t array
|
|
* @nump: pointer to store the resultant numerator
|
|
* @denp: pointer to store the resultant denominator
|
|
*
|
|
* Returns non-zero if the value is changed, zero if not changed.
|
|
*/
|
|
int snd_interval_ratnum(struct snd_interval *i,
|
|
unsigned int rats_count, struct snd_ratnum *rats,
|
|
unsigned int *nump, unsigned int *denp)
|
|
{
|
|
unsigned int best_num, best_den;
|
|
int best_diff;
|
|
unsigned int k;
|
|
struct snd_interval t;
|
|
int err;
|
|
unsigned int result_num, result_den;
|
|
int result_diff;
|
|
|
|
best_num = best_den = best_diff = 0;
|
|
for (k = 0; k < rats_count; ++k) {
|
|
unsigned int num = rats[k].num;
|
|
unsigned int den;
|
|
unsigned int q = i->min;
|
|
int diff;
|
|
if (q == 0)
|
|
q = 1;
|
|
den = div_up(num, q);
|
|
if (den < rats[k].den_min)
|
|
continue;
|
|
if (den > rats[k].den_max)
|
|
den = rats[k].den_max;
|
|
else {
|
|
unsigned int r;
|
|
r = (den - rats[k].den_min) % rats[k].den_step;
|
|
if (r != 0)
|
|
den -= r;
|
|
}
|
|
diff = num - q * den;
|
|
if (diff < 0)
|
|
diff = -diff;
|
|
if (best_num == 0 ||
|
|
diff * best_den < best_diff * den) {
|
|
best_diff = diff;
|
|
best_den = den;
|
|
best_num = num;
|
|
}
|
|
}
|
|
if (best_den == 0) {
|
|
i->empty = 1;
|
|
return -EINVAL;
|
|
}
|
|
t.min = div_down(best_num, best_den);
|
|
t.openmin = !!(best_num % best_den);
|
|
|
|
result_num = best_num;
|
|
result_diff = best_diff;
|
|
result_den = best_den;
|
|
best_num = best_den = best_diff = 0;
|
|
for (k = 0; k < rats_count; ++k) {
|
|
unsigned int num = rats[k].num;
|
|
unsigned int den;
|
|
unsigned int q = i->max;
|
|
int diff;
|
|
if (q == 0) {
|
|
i->empty = 1;
|
|
return -EINVAL;
|
|
}
|
|
den = div_down(num, q);
|
|
if (den > rats[k].den_max)
|
|
continue;
|
|
if (den < rats[k].den_min)
|
|
den = rats[k].den_min;
|
|
else {
|
|
unsigned int r;
|
|
r = (den - rats[k].den_min) % rats[k].den_step;
|
|
if (r != 0)
|
|
den += rats[k].den_step - r;
|
|
}
|
|
diff = q * den - num;
|
|
if (diff < 0)
|
|
diff = -diff;
|
|
if (best_num == 0 ||
|
|
diff * best_den < best_diff * den) {
|
|
best_diff = diff;
|
|
best_den = den;
|
|
best_num = num;
|
|
}
|
|
}
|
|
if (best_den == 0) {
|
|
i->empty = 1;
|
|
return -EINVAL;
|
|
}
|
|
t.max = div_up(best_num, best_den);
|
|
t.openmax = !!(best_num % best_den);
|
|
t.integer = 0;
|
|
err = snd_interval_refine(i, &t);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
if (snd_interval_single(i)) {
|
|
if (best_diff * result_den < result_diff * best_den) {
|
|
result_num = best_num;
|
|
result_den = best_den;
|
|
}
|
|
if (nump)
|
|
*nump = result_num;
|
|
if (denp)
|
|
*denp = result_den;
|
|
}
|
|
return err;
|
|
}
|
|
|
|
EXPORT_SYMBOL(snd_interval_ratnum);
|
|
|
|
/**
|
|
* snd_interval_ratden - refine the interval value
|
|
* @i: interval to refine
|
|
* @rats_count: number of struct ratden
|
|
* @rats: struct ratden array
|
|
* @nump: pointer to store the resultant numerator
|
|
* @denp: pointer to store the resultant denominator
|
|
*
|
|
* Returns non-zero if the value is changed, zero if not changed.
|
|
*/
|
|
static int snd_interval_ratden(struct snd_interval *i,
|
|
unsigned int rats_count, struct snd_ratden *rats,
|
|
unsigned int *nump, unsigned int *denp)
|
|
{
|
|
unsigned int best_num, best_diff, best_den;
|
|
unsigned int k;
|
|
struct snd_interval t;
|
|
int err;
|
|
|
|
best_num = best_den = best_diff = 0;
|
|
for (k = 0; k < rats_count; ++k) {
|
|
unsigned int num;
|
|
unsigned int den = rats[k].den;
|
|
unsigned int q = i->min;
|
|
int diff;
|
|
num = mul(q, den);
|
|
if (num > rats[k].num_max)
|
|
continue;
|
|
if (num < rats[k].num_min)
|
|
num = rats[k].num_max;
|
|
else {
|
|
unsigned int r;
|
|
r = (num - rats[k].num_min) % rats[k].num_step;
|
|
if (r != 0)
|
|
num += rats[k].num_step - r;
|
|
}
|
|
diff = num - q * den;
|
|
if (best_num == 0 ||
|
|
diff * best_den < best_diff * den) {
|
|
best_diff = diff;
|
|
best_den = den;
|
|
best_num = num;
|
|
}
|
|
}
|
|
if (best_den == 0) {
|
|
i->empty = 1;
|
|
return -EINVAL;
|
|
}
|
|
t.min = div_down(best_num, best_den);
|
|
t.openmin = !!(best_num % best_den);
|
|
|
|
best_num = best_den = best_diff = 0;
|
|
for (k = 0; k < rats_count; ++k) {
|
|
unsigned int num;
|
|
unsigned int den = rats[k].den;
|
|
unsigned int q = i->max;
|
|
int diff;
|
|
num = mul(q, den);
|
|
if (num < rats[k].num_min)
|
|
continue;
|
|
if (num > rats[k].num_max)
|
|
num = rats[k].num_max;
|
|
else {
|
|
unsigned int r;
|
|
r = (num - rats[k].num_min) % rats[k].num_step;
|
|
if (r != 0)
|
|
num -= r;
|
|
}
|
|
diff = q * den - num;
|
|
if (best_num == 0 ||
|
|
diff * best_den < best_diff * den) {
|
|
best_diff = diff;
|
|
best_den = den;
|
|
best_num = num;
|
|
}
|
|
}
|
|
if (best_den == 0) {
|
|
i->empty = 1;
|
|
return -EINVAL;
|
|
}
|
|
t.max = div_up(best_num, best_den);
|
|
t.openmax = !!(best_num % best_den);
|
|
t.integer = 0;
|
|
err = snd_interval_refine(i, &t);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
if (snd_interval_single(i)) {
|
|
if (nump)
|
|
*nump = best_num;
|
|
if (denp)
|
|
*denp = best_den;
|
|
}
|
|
return err;
|
|
}
|
|
|
|
/**
|
|
* snd_interval_list - refine the interval value from the list
|
|
* @i: the interval value to refine
|
|
* @count: the number of elements in the list
|
|
* @list: the value list
|
|
* @mask: the bit-mask to evaluate
|
|
*
|
|
* Refines the interval value from the list.
|
|
* When mask is non-zero, only the elements corresponding to bit 1 are
|
|
* evaluated.
|
|
*
|
|
* Returns non-zero if the value is changed, zero if not changed.
|
|
*/
|
|
int snd_interval_list(struct snd_interval *i, unsigned int count,
|
|
const unsigned int *list, unsigned int mask)
|
|
{
|
|
unsigned int k;
|
|
struct snd_interval list_range;
|
|
|
|
if (!count) {
|
|
i->empty = 1;
|
|
return -EINVAL;
|
|
}
|
|
snd_interval_any(&list_range);
|
|
list_range.min = UINT_MAX;
|
|
list_range.max = 0;
|
|
for (k = 0; k < count; k++) {
|
|
if (mask && !(mask & (1 << k)))
|
|
continue;
|
|
if (!snd_interval_test(i, list[k]))
|
|
continue;
|
|
list_range.min = min(list_range.min, list[k]);
|
|
list_range.max = max(list_range.max, list[k]);
|
|
}
|
|
return snd_interval_refine(i, &list_range);
|
|
}
|
|
|
|
EXPORT_SYMBOL(snd_interval_list);
|
|
|
|
static int snd_interval_step(struct snd_interval *i, unsigned int min, unsigned int step)
|
|
{
|
|
unsigned int n;
|
|
int changed = 0;
|
|
n = (i->min - min) % step;
|
|
if (n != 0 || i->openmin) {
|
|
i->min += step - n;
|
|
changed = 1;
|
|
}
|
|
n = (i->max - min) % step;
|
|
if (n != 0 || i->openmax) {
|
|
i->max -= n;
|
|
changed = 1;
|
|
}
|
|
if (snd_interval_checkempty(i)) {
|
|
i->empty = 1;
|
|
return -EINVAL;
|
|
}
|
|
return changed;
|
|
}
|
|
|
|
/* Info constraints helpers */
|
|
|
|
/**
|
|
* snd_pcm_hw_rule_add - add the hw-constraint rule
|
|
* @runtime: the pcm runtime instance
|
|
* @cond: condition bits
|
|
* @var: the variable to evaluate
|
|
* @func: the evaluation function
|
|
* @private: the private data pointer passed to function
|
|
* @dep: the dependent variables
|
|
*
|
|
* Returns zero if successful, or a negative error code on failure.
|
|
*/
|
|
int snd_pcm_hw_rule_add(struct snd_pcm_runtime *runtime, unsigned int cond,
|
|
int var,
|
|
snd_pcm_hw_rule_func_t func, void *private,
|
|
int dep, ...)
|
|
{
|
|
struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
|
|
struct snd_pcm_hw_rule *c;
|
|
unsigned int k;
|
|
va_list args;
|
|
va_start(args, dep);
|
|
if (constrs->rules_num >= constrs->rules_all) {
|
|
struct snd_pcm_hw_rule *new;
|
|
unsigned int new_rules = constrs->rules_all + 16;
|
|
new = kcalloc(new_rules, sizeof(*c), GFP_KERNEL);
|
|
if (!new) {
|
|
va_end(args);
|
|
return -ENOMEM;
|
|
}
|
|
if (constrs->rules) {
|
|
memcpy(new, constrs->rules,
|
|
constrs->rules_num * sizeof(*c));
|
|
kfree(constrs->rules);
|
|
}
|
|
constrs->rules = new;
|
|
constrs->rules_all = new_rules;
|
|
}
|
|
c = &constrs->rules[constrs->rules_num];
|
|
c->cond = cond;
|
|
c->func = func;
|
|
c->var = var;
|
|
c->private = private;
|
|
k = 0;
|
|
while (1) {
|
|
if (snd_BUG_ON(k >= ARRAY_SIZE(c->deps))) {
|
|
va_end(args);
|
|
return -EINVAL;
|
|
}
|
|
c->deps[k++] = dep;
|
|
if (dep < 0)
|
|
break;
|
|
dep = va_arg(args, int);
|
|
}
|
|
constrs->rules_num++;
|
|
va_end(args);
|
|
return 0;
|
|
}
|
|
|
|
EXPORT_SYMBOL(snd_pcm_hw_rule_add);
|
|
|
|
/**
|
|
* snd_pcm_hw_constraint_mask - apply the given bitmap mask constraint
|
|
* @runtime: PCM runtime instance
|
|
* @var: hw_params variable to apply the mask
|
|
* @mask: the bitmap mask
|
|
*
|
|
* Apply the constraint of the given bitmap mask to a 32-bit mask parameter.
|
|
*/
|
|
int snd_pcm_hw_constraint_mask(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
|
|
u_int32_t mask)
|
|
{
|
|
struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
|
|
struct snd_mask *maskp = constrs_mask(constrs, var);
|
|
*maskp->bits &= mask;
|
|
memset(maskp->bits + 1, 0, (SNDRV_MASK_MAX-32) / 8); /* clear rest */
|
|
if (*maskp->bits == 0)
|
|
return -EINVAL;
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* snd_pcm_hw_constraint_mask64 - apply the given bitmap mask constraint
|
|
* @runtime: PCM runtime instance
|
|
* @var: hw_params variable to apply the mask
|
|
* @mask: the 64bit bitmap mask
|
|
*
|
|
* Apply the constraint of the given bitmap mask to a 64-bit mask parameter.
|
|
*/
|
|
int snd_pcm_hw_constraint_mask64(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
|
|
u_int64_t mask)
|
|
{
|
|
struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
|
|
struct snd_mask *maskp = constrs_mask(constrs, var);
|
|
maskp->bits[0] &= (u_int32_t)mask;
|
|
maskp->bits[1] &= (u_int32_t)(mask >> 32);
|
|
memset(maskp->bits + 2, 0, (SNDRV_MASK_MAX-64) / 8); /* clear rest */
|
|
if (! maskp->bits[0] && ! maskp->bits[1])
|
|
return -EINVAL;
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* snd_pcm_hw_constraint_integer - apply an integer constraint to an interval
|
|
* @runtime: PCM runtime instance
|
|
* @var: hw_params variable to apply the integer constraint
|
|
*
|
|
* Apply the constraint of integer to an interval parameter.
|
|
*/
|
|
int snd_pcm_hw_constraint_integer(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var)
|
|
{
|
|
struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
|
|
return snd_interval_setinteger(constrs_interval(constrs, var));
|
|
}
|
|
|
|
EXPORT_SYMBOL(snd_pcm_hw_constraint_integer);
|
|
|
|
/**
|
|
* snd_pcm_hw_constraint_minmax - apply a min/max range constraint to an interval
|
|
* @runtime: PCM runtime instance
|
|
* @var: hw_params variable to apply the range
|
|
* @min: the minimal value
|
|
* @max: the maximal value
|
|
*
|
|
* Apply the min/max range constraint to an interval parameter.
|
|
*/
|
|
int snd_pcm_hw_constraint_minmax(struct snd_pcm_runtime *runtime, snd_pcm_hw_param_t var,
|
|
unsigned int min, unsigned int max)
|
|
{
|
|
struct snd_pcm_hw_constraints *constrs = &runtime->hw_constraints;
|
|
struct snd_interval t;
|
|
t.min = min;
|
|
t.max = max;
|
|
t.openmin = t.openmax = 0;
|
|
t.integer = 0;
|
|
return snd_interval_refine(constrs_interval(constrs, var), &t);
|
|
}
|
|
|
|
EXPORT_SYMBOL(snd_pcm_hw_constraint_minmax);
|
|
|
|
static int snd_pcm_hw_rule_list(struct snd_pcm_hw_params *params,
|
|
struct snd_pcm_hw_rule *rule)
|
|
{
|
|
struct snd_pcm_hw_constraint_list *list = rule->private;
|
|
return snd_interval_list(hw_param_interval(params, rule->var), list->count, list->list, list->mask);
|
|
}
|
|
|
|
|
|
/**
|
|
* snd_pcm_hw_constraint_list - apply a list of constraints to a parameter
|
|
* @runtime: PCM runtime instance
|
|
* @cond: condition bits
|
|
* @var: hw_params variable to apply the list constraint
|
|
* @l: list
|
|
*
|
|
* Apply the list of constraints to an interval parameter.
|
|
*/
|
|
int snd_pcm_hw_constraint_list(struct snd_pcm_runtime *runtime,
|
|
unsigned int cond,
|
|
snd_pcm_hw_param_t var,
|
|
struct snd_pcm_hw_constraint_list *l)
|
|
{
|
|
return snd_pcm_hw_rule_add(runtime, cond, var,
|
|
snd_pcm_hw_rule_list, l,
|
|
var, -1);
|
|
}
|
|
|
|
EXPORT_SYMBOL(snd_pcm_hw_constraint_list);
|
|
|
|
static int snd_pcm_hw_rule_ratnums(struct snd_pcm_hw_params *params,
|
|
struct snd_pcm_hw_rule *rule)
|
|
{
|
|
struct snd_pcm_hw_constraint_ratnums *r = rule->private;
|
|
unsigned int num = 0, den = 0;
|
|
int err;
|
|
err = snd_interval_ratnum(hw_param_interval(params, rule->var),
|
|
r->nrats, r->rats, &num, &den);
|
|
if (err >= 0 && den && rule->var == SNDRV_PCM_HW_PARAM_RATE) {
|
|
params->rate_num = num;
|
|
params->rate_den = den;
|
|
}
|
|
return err;
|
|
}
|
|
|
|
/**
|
|
* snd_pcm_hw_constraint_ratnums - apply ratnums constraint to a parameter
|
|
* @runtime: PCM runtime instance
|
|
* @cond: condition bits
|
|
* @var: hw_params variable to apply the ratnums constraint
|
|
* @r: struct snd_ratnums constriants
|
|
*/
|
|
int snd_pcm_hw_constraint_ratnums(struct snd_pcm_runtime *runtime,
|
|
unsigned int cond,
|
|
snd_pcm_hw_param_t var,
|
|
struct snd_pcm_hw_constraint_ratnums *r)
|
|
{
|
|
return snd_pcm_hw_rule_add(runtime, cond, var,
|
|
snd_pcm_hw_rule_ratnums, r,
|
|
var, -1);
|
|
}
|
|
|
|
EXPORT_SYMBOL(snd_pcm_hw_constraint_ratnums);
|
|
|
|
static int snd_pcm_hw_rule_ratdens(struct snd_pcm_hw_params *params,
|
|
struct snd_pcm_hw_rule *rule)
|
|
{
|
|
struct snd_pcm_hw_constraint_ratdens *r = rule->private;
|
|
unsigned int num = 0, den = 0;
|
|
int err = snd_interval_ratden(hw_param_interval(params, rule->var),
|
|
r->nrats, r->rats, &num, &den);
|
|
if (err >= 0 && den && rule->var == SNDRV_PCM_HW_PARAM_RATE) {
|
|
params->rate_num = num;
|
|
params->rate_den = den;
|
|
}
|
|
return err;
|
|
}
|
|
|
|
/**
|
|
* snd_pcm_hw_constraint_ratdens - apply ratdens constraint to a parameter
|
|
* @runtime: PCM runtime instance
|
|
* @cond: condition bits
|
|
* @var: hw_params variable to apply the ratdens constraint
|
|
* @r: struct snd_ratdens constriants
|
|
*/
|
|
int snd_pcm_hw_constraint_ratdens(struct snd_pcm_runtime *runtime,
|
|
unsigned int cond,
|
|
snd_pcm_hw_param_t var,
|
|
struct snd_pcm_hw_constraint_ratdens *r)
|
|
{
|
|
return snd_pcm_hw_rule_add(runtime, cond, var,
|
|
snd_pcm_hw_rule_ratdens, r,
|
|
var, -1);
|
|
}
|
|
|
|
EXPORT_SYMBOL(snd_pcm_hw_constraint_ratdens);
|
|
|
|
static int snd_pcm_hw_rule_msbits(struct snd_pcm_hw_params *params,
|
|
struct snd_pcm_hw_rule *rule)
|
|
{
|
|
unsigned int l = (unsigned long) rule->private;
|
|
int width = l & 0xffff;
|
|
unsigned int msbits = l >> 16;
|
|
struct snd_interval *i = hw_param_interval(params, SNDRV_PCM_HW_PARAM_SAMPLE_BITS);
|
|
if (snd_interval_single(i) && snd_interval_value(i) == width)
|
|
params->msbits = msbits;
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* snd_pcm_hw_constraint_msbits - add a hw constraint msbits rule
|
|
* @runtime: PCM runtime instance
|
|
* @cond: condition bits
|
|
* @width: sample bits width
|
|
* @msbits: msbits width
|
|
*/
|
|
int snd_pcm_hw_constraint_msbits(struct snd_pcm_runtime *runtime,
|
|
unsigned int cond,
|
|
unsigned int width,
|
|
unsigned int msbits)
|
|
{
|
|
unsigned long l = (msbits << 16) | width;
|
|
return snd_pcm_hw_rule_add(runtime, cond, -1,
|
|
snd_pcm_hw_rule_msbits,
|
|
(void*) l,
|
|
SNDRV_PCM_HW_PARAM_SAMPLE_BITS, -1);
|
|
}
|
|
|
|
EXPORT_SYMBOL(snd_pcm_hw_constraint_msbits);
|
|
|
|
static int snd_pcm_hw_rule_step(struct snd_pcm_hw_params *params,
|
|
struct snd_pcm_hw_rule *rule)
|
|
{
|
|
unsigned long step = (unsigned long) rule->private;
|
|
return snd_interval_step(hw_param_interval(params, rule->var), 0, step);
|
|
}
|
|
|
|
/**
|
|
* snd_pcm_hw_constraint_step - add a hw constraint step rule
|
|
* @runtime: PCM runtime instance
|
|
* @cond: condition bits
|
|
* @var: hw_params variable to apply the step constraint
|
|
* @step: step size
|
|
*/
|
|
int snd_pcm_hw_constraint_step(struct snd_pcm_runtime *runtime,
|
|
unsigned int cond,
|
|
snd_pcm_hw_param_t var,
|
|
unsigned long step)
|
|
{
|
|
return snd_pcm_hw_rule_add(runtime, cond, var,
|
|
snd_pcm_hw_rule_step, (void *) step,
|
|
var, -1);
|
|
}
|
|
|
|
EXPORT_SYMBOL(snd_pcm_hw_constraint_step);
|
|
|
|
static int snd_pcm_hw_rule_pow2(struct snd_pcm_hw_params *params, struct snd_pcm_hw_rule *rule)
|
|
{
|
|
static unsigned int pow2_sizes[] = {
|
|
1<<0, 1<<1, 1<<2, 1<<3, 1<<4, 1<<5, 1<<6, 1<<7,
|
|
1<<8, 1<<9, 1<<10, 1<<11, 1<<12, 1<<13, 1<<14, 1<<15,
|
|
1<<16, 1<<17, 1<<18, 1<<19, 1<<20, 1<<21, 1<<22, 1<<23,
|
|
1<<24, 1<<25, 1<<26, 1<<27, 1<<28, 1<<29, 1<<30
|
|
};
|
|
return snd_interval_list(hw_param_interval(params, rule->var),
|
|
ARRAY_SIZE(pow2_sizes), pow2_sizes, 0);
|
|
}
|
|
|
|
/**
|
|
* snd_pcm_hw_constraint_pow2 - add a hw constraint power-of-2 rule
|
|
* @runtime: PCM runtime instance
|
|
* @cond: condition bits
|
|
* @var: hw_params variable to apply the power-of-2 constraint
|
|
*/
|
|
int snd_pcm_hw_constraint_pow2(struct snd_pcm_runtime *runtime,
|
|
unsigned int cond,
|
|
snd_pcm_hw_param_t var)
|
|
{
|
|
return snd_pcm_hw_rule_add(runtime, cond, var,
|
|
snd_pcm_hw_rule_pow2, NULL,
|
|
var, -1);
|
|
}
|
|
|
|
EXPORT_SYMBOL(snd_pcm_hw_constraint_pow2);
|
|
|
|
static int snd_pcm_hw_rule_noresample_func(struct snd_pcm_hw_params *params,
|
|
struct snd_pcm_hw_rule *rule)
|
|
{
|
|
unsigned int base_rate = (unsigned int)(uintptr_t)rule->private;
|
|
struct snd_interval *rate;
|
|
|
|
rate = hw_param_interval(params, SNDRV_PCM_HW_PARAM_RATE);
|
|
return snd_interval_list(rate, 1, &base_rate, 0);
|
|
}
|
|
|
|
/**
|
|
* snd_pcm_hw_rule_noresample - add a rule to allow disabling hw resampling
|
|
* @runtime: PCM runtime instance
|
|
* @base_rate: the rate at which the hardware does not resample
|
|
*/
|
|
int snd_pcm_hw_rule_noresample(struct snd_pcm_runtime *runtime,
|
|
unsigned int base_rate)
|
|
{
|
|
return snd_pcm_hw_rule_add(runtime, SNDRV_PCM_HW_PARAMS_NORESAMPLE,
|
|
SNDRV_PCM_HW_PARAM_RATE,
|
|
snd_pcm_hw_rule_noresample_func,
|
|
(void *)(uintptr_t)base_rate,
|
|
SNDRV_PCM_HW_PARAM_RATE, -1);
|
|
}
|
|
EXPORT_SYMBOL(snd_pcm_hw_rule_noresample);
|
|
|
|
static void _snd_pcm_hw_param_any(struct snd_pcm_hw_params *params,
|
|
snd_pcm_hw_param_t var)
|
|
{
|
|
if (hw_is_mask(var)) {
|
|
snd_mask_any(hw_param_mask(params, var));
|
|
params->cmask |= 1 << var;
|
|
params->rmask |= 1 << var;
|
|
return;
|
|
}
|
|
if (hw_is_interval(var)) {
|
|
snd_interval_any(hw_param_interval(params, var));
|
|
params->cmask |= 1 << var;
|
|
params->rmask |= 1 << var;
|
|
return;
|
|
}
|
|
snd_BUG();
|
|
}
|
|
|
|
void _snd_pcm_hw_params_any(struct snd_pcm_hw_params *params)
|
|
{
|
|
unsigned int k;
|
|
memset(params, 0, sizeof(*params));
|
|
for (k = SNDRV_PCM_HW_PARAM_FIRST_MASK; k <= SNDRV_PCM_HW_PARAM_LAST_MASK; k++)
|
|
_snd_pcm_hw_param_any(params, k);
|
|
for (k = SNDRV_PCM_HW_PARAM_FIRST_INTERVAL; k <= SNDRV_PCM_HW_PARAM_LAST_INTERVAL; k++)
|
|
_snd_pcm_hw_param_any(params, k);
|
|
params->info = ~0U;
|
|
}
|
|
|
|
EXPORT_SYMBOL(_snd_pcm_hw_params_any);
|
|
|
|
/**
|
|
* snd_pcm_hw_param_value - return @params field @var value
|
|
* @params: the hw_params instance
|
|
* @var: parameter to retrieve
|
|
* @dir: pointer to the direction (-1,0,1) or %NULL
|
|
*
|
|
* Return the value for field @var if it's fixed in configuration space
|
|
* defined by @params. Return -%EINVAL otherwise.
|
|
*/
|
|
int snd_pcm_hw_param_value(const struct snd_pcm_hw_params *params,
|
|
snd_pcm_hw_param_t var, int *dir)
|
|
{
|
|
if (hw_is_mask(var)) {
|
|
const struct snd_mask *mask = hw_param_mask_c(params, var);
|
|
if (!snd_mask_single(mask))
|
|
return -EINVAL;
|
|
if (dir)
|
|
*dir = 0;
|
|
return snd_mask_value(mask);
|
|
}
|
|
if (hw_is_interval(var)) {
|
|
const struct snd_interval *i = hw_param_interval_c(params, var);
|
|
if (!snd_interval_single(i))
|
|
return -EINVAL;
|
|
if (dir)
|
|
*dir = i->openmin;
|
|
return snd_interval_value(i);
|
|
}
|
|
return -EINVAL;
|
|
}
|
|
|
|
EXPORT_SYMBOL(snd_pcm_hw_param_value);
|
|
|
|
void _snd_pcm_hw_param_setempty(struct snd_pcm_hw_params *params,
|
|
snd_pcm_hw_param_t var)
|
|
{
|
|
if (hw_is_mask(var)) {
|
|
snd_mask_none(hw_param_mask(params, var));
|
|
params->cmask |= 1 << var;
|
|
params->rmask |= 1 << var;
|
|
} else if (hw_is_interval(var)) {
|
|
snd_interval_none(hw_param_interval(params, var));
|
|
params->cmask |= 1 << var;
|
|
params->rmask |= 1 << var;
|
|
} else {
|
|
snd_BUG();
|
|
}
|
|
}
|
|
|
|
EXPORT_SYMBOL(_snd_pcm_hw_param_setempty);
|
|
|
|
static int _snd_pcm_hw_param_first(struct snd_pcm_hw_params *params,
|
|
snd_pcm_hw_param_t var)
|
|
{
|
|
int changed;
|
|
if (hw_is_mask(var))
|
|
changed = snd_mask_refine_first(hw_param_mask(params, var));
|
|
else if (hw_is_interval(var))
|
|
changed = snd_interval_refine_first(hw_param_interval(params, var));
|
|
else
|
|
return -EINVAL;
|
|
if (changed) {
|
|
params->cmask |= 1 << var;
|
|
params->rmask |= 1 << var;
|
|
}
|
|
return changed;
|
|
}
|
|
|
|
|
|
/**
|
|
* snd_pcm_hw_param_first - refine config space and return minimum value
|
|
* @pcm: PCM instance
|
|
* @params: the hw_params instance
|
|
* @var: parameter to retrieve
|
|
* @dir: pointer to the direction (-1,0,1) or %NULL
|
|
*
|
|
* Inside configuration space defined by @params remove from @var all
|
|
* values > minimum. Reduce configuration space accordingly.
|
|
* Return the minimum.
|
|
*/
|
|
int snd_pcm_hw_param_first(struct snd_pcm_substream *pcm,
|
|
struct snd_pcm_hw_params *params,
|
|
snd_pcm_hw_param_t var, int *dir)
|
|
{
|
|
int changed = _snd_pcm_hw_param_first(params, var);
|
|
if (changed < 0)
|
|
return changed;
|
|
if (params->rmask) {
|
|
int err = snd_pcm_hw_refine(pcm, params);
|
|
if (snd_BUG_ON(err < 0))
|
|
return err;
|
|
}
|
|
return snd_pcm_hw_param_value(params, var, dir);
|
|
}
|
|
|
|
EXPORT_SYMBOL(snd_pcm_hw_param_first);
|
|
|
|
static int _snd_pcm_hw_param_last(struct snd_pcm_hw_params *params,
|
|
snd_pcm_hw_param_t var)
|
|
{
|
|
int changed;
|
|
if (hw_is_mask(var))
|
|
changed = snd_mask_refine_last(hw_param_mask(params, var));
|
|
else if (hw_is_interval(var))
|
|
changed = snd_interval_refine_last(hw_param_interval(params, var));
|
|
else
|
|
return -EINVAL;
|
|
if (changed) {
|
|
params->cmask |= 1 << var;
|
|
params->rmask |= 1 << var;
|
|
}
|
|
return changed;
|
|
}
|
|
|
|
|
|
/**
|
|
* snd_pcm_hw_param_last - refine config space and return maximum value
|
|
* @pcm: PCM instance
|
|
* @params: the hw_params instance
|
|
* @var: parameter to retrieve
|
|
* @dir: pointer to the direction (-1,0,1) or %NULL
|
|
*
|
|
* Inside configuration space defined by @params remove from @var all
|
|
* values < maximum. Reduce configuration space accordingly.
|
|
* Return the maximum.
|
|
*/
|
|
int snd_pcm_hw_param_last(struct snd_pcm_substream *pcm,
|
|
struct snd_pcm_hw_params *params,
|
|
snd_pcm_hw_param_t var, int *dir)
|
|
{
|
|
int changed = _snd_pcm_hw_param_last(params, var);
|
|
if (changed < 0)
|
|
return changed;
|
|
if (params->rmask) {
|
|
int err = snd_pcm_hw_refine(pcm, params);
|
|
if (snd_BUG_ON(err < 0))
|
|
return err;
|
|
}
|
|
return snd_pcm_hw_param_value(params, var, dir);
|
|
}
|
|
|
|
EXPORT_SYMBOL(snd_pcm_hw_param_last);
|
|
|
|
/**
|
|
* snd_pcm_hw_param_choose - choose a configuration defined by @params
|
|
* @pcm: PCM instance
|
|
* @params: the hw_params instance
|
|
*
|
|
* Choose one configuration from configuration space defined by @params.
|
|
* The configuration chosen is that obtained fixing in this order:
|
|
* first access, first format, first subformat, min channels,
|
|
* min rate, min period time, max buffer size, min tick time
|
|
*/
|
|
int snd_pcm_hw_params_choose(struct snd_pcm_substream *pcm,
|
|
struct snd_pcm_hw_params *params)
|
|
{
|
|
static int vars[] = {
|
|
SNDRV_PCM_HW_PARAM_ACCESS,
|
|
SNDRV_PCM_HW_PARAM_FORMAT,
|
|
SNDRV_PCM_HW_PARAM_SUBFORMAT,
|
|
SNDRV_PCM_HW_PARAM_CHANNELS,
|
|
SNDRV_PCM_HW_PARAM_RATE,
|
|
SNDRV_PCM_HW_PARAM_PERIOD_TIME,
|
|
SNDRV_PCM_HW_PARAM_BUFFER_SIZE,
|
|
SNDRV_PCM_HW_PARAM_TICK_TIME,
|
|
-1
|
|
};
|
|
int err, *v;
|
|
|
|
for (v = vars; *v != -1; v++) {
|
|
if (*v != SNDRV_PCM_HW_PARAM_BUFFER_SIZE)
|
|
err = snd_pcm_hw_param_first(pcm, params, *v, NULL);
|
|
else
|
|
err = snd_pcm_hw_param_last(pcm, params, *v, NULL);
|
|
if (snd_BUG_ON(err < 0))
|
|
return err;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int snd_pcm_lib_ioctl_reset(struct snd_pcm_substream *substream,
|
|
void *arg)
|
|
{
|
|
struct snd_pcm_runtime *runtime = substream->runtime;
|
|
unsigned long flags;
|
|
snd_pcm_stream_lock_irqsave(substream, flags);
|
|
if (snd_pcm_running(substream) &&
|
|
snd_pcm_update_hw_ptr(substream) >= 0)
|
|
runtime->status->hw_ptr %= runtime->buffer_size;
|
|
else
|
|
runtime->status->hw_ptr = 0;
|
|
snd_pcm_stream_unlock_irqrestore(substream, flags);
|
|
return 0;
|
|
}
|
|
|
|
static int snd_pcm_lib_ioctl_channel_info(struct snd_pcm_substream *substream,
|
|
void *arg)
|
|
{
|
|
struct snd_pcm_channel_info *info = arg;
|
|
struct snd_pcm_runtime *runtime = substream->runtime;
|
|
int width;
|
|
if (!(runtime->info & SNDRV_PCM_INFO_MMAP)) {
|
|
info->offset = -1;
|
|
return 0;
|
|
}
|
|
width = snd_pcm_format_physical_width(runtime->format);
|
|
if (width < 0)
|
|
return width;
|
|
info->offset = 0;
|
|
switch (runtime->access) {
|
|
case SNDRV_PCM_ACCESS_MMAP_INTERLEAVED:
|
|
case SNDRV_PCM_ACCESS_RW_INTERLEAVED:
|
|
info->first = info->channel * width;
|
|
info->step = runtime->channels * width;
|
|
break;
|
|
case SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED:
|
|
case SNDRV_PCM_ACCESS_RW_NONINTERLEAVED:
|
|
{
|
|
size_t size = runtime->dma_bytes / runtime->channels;
|
|
info->first = info->channel * size * 8;
|
|
info->step = width;
|
|
break;
|
|
}
|
|
default:
|
|
snd_BUG();
|
|
break;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int snd_pcm_lib_ioctl_fifo_size(struct snd_pcm_substream *substream,
|
|
void *arg)
|
|
{
|
|
struct snd_pcm_hw_params *params = arg;
|
|
snd_pcm_format_t format;
|
|
int channels, width;
|
|
|
|
params->fifo_size = substream->runtime->hw.fifo_size;
|
|
if (!(substream->runtime->hw.info & SNDRV_PCM_INFO_FIFO_IN_FRAMES)) {
|
|
format = params_format(params);
|
|
channels = params_channels(params);
|
|
width = snd_pcm_format_physical_width(format);
|
|
params->fifo_size /= width * channels;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* snd_pcm_lib_ioctl - a generic PCM ioctl callback
|
|
* @substream: the pcm substream instance
|
|
* @cmd: ioctl command
|
|
* @arg: ioctl argument
|
|
*
|
|
* Processes the generic ioctl commands for PCM.
|
|
* Can be passed as the ioctl callback for PCM ops.
|
|
*
|
|
* Returns zero if successful, or a negative error code on failure.
|
|
*/
|
|
int snd_pcm_lib_ioctl(struct snd_pcm_substream *substream,
|
|
unsigned int cmd, void *arg)
|
|
{
|
|
switch (cmd) {
|
|
case SNDRV_PCM_IOCTL1_INFO:
|
|
return 0;
|
|
case SNDRV_PCM_IOCTL1_RESET:
|
|
return snd_pcm_lib_ioctl_reset(substream, arg);
|
|
case SNDRV_PCM_IOCTL1_CHANNEL_INFO:
|
|
return snd_pcm_lib_ioctl_channel_info(substream, arg);
|
|
case SNDRV_PCM_IOCTL1_FIFO_SIZE:
|
|
return snd_pcm_lib_ioctl_fifo_size(substream, arg);
|
|
}
|
|
return -ENXIO;
|
|
}
|
|
|
|
EXPORT_SYMBOL(snd_pcm_lib_ioctl);
|
|
|
|
/**
|
|
* snd_pcm_period_elapsed - update the pcm status for the next period
|
|
* @substream: the pcm substream instance
|
|
*
|
|
* This function is called from the interrupt handler when the
|
|
* PCM has processed the period size. It will update the current
|
|
* pointer, wake up sleepers, etc.
|
|
*
|
|
* Even if more than one periods have elapsed since the last call, you
|
|
* have to call this only once.
|
|
*/
|
|
void snd_pcm_period_elapsed(struct snd_pcm_substream *substream)
|
|
{
|
|
struct snd_pcm_runtime *runtime;
|
|
unsigned long flags;
|
|
|
|
if (PCM_RUNTIME_CHECK(substream))
|
|
return;
|
|
runtime = substream->runtime;
|
|
|
|
if (runtime->transfer_ack_begin)
|
|
runtime->transfer_ack_begin(substream);
|
|
|
|
snd_pcm_stream_lock_irqsave(substream, flags);
|
|
if (!snd_pcm_running(substream) ||
|
|
snd_pcm_update_hw_ptr0(substream, 1) < 0)
|
|
goto _end;
|
|
|
|
if (substream->timer_running)
|
|
snd_timer_interrupt(substream->timer, 1);
|
|
_end:
|
|
snd_pcm_stream_unlock_irqrestore(substream, flags);
|
|
if (runtime->transfer_ack_end)
|
|
runtime->transfer_ack_end(substream);
|
|
kill_fasync(&runtime->fasync, SIGIO, POLL_IN);
|
|
}
|
|
|
|
EXPORT_SYMBOL(snd_pcm_period_elapsed);
|
|
|
|
/*
|
|
* Wait until avail_min data becomes available
|
|
* Returns a negative error code if any error occurs during operation.
|
|
* The available space is stored on availp. When err = 0 and avail = 0
|
|
* on the capture stream, it indicates the stream is in DRAINING state.
|
|
*/
|
|
static int wait_for_avail(struct snd_pcm_substream *substream,
|
|
snd_pcm_uframes_t *availp)
|
|
{
|
|
struct snd_pcm_runtime *runtime = substream->runtime;
|
|
int is_playback = substream->stream == SNDRV_PCM_STREAM_PLAYBACK;
|
|
wait_queue_t wait;
|
|
int err = 0;
|
|
snd_pcm_uframes_t avail = 0;
|
|
long wait_time, tout;
|
|
|
|
init_waitqueue_entry(&wait, current);
|
|
set_current_state(TASK_INTERRUPTIBLE);
|
|
add_wait_queue(&runtime->tsleep, &wait);
|
|
|
|
if (runtime->no_period_wakeup)
|
|
wait_time = MAX_SCHEDULE_TIMEOUT;
|
|
else {
|
|
wait_time = 10;
|
|
if (runtime->rate) {
|
|
long t = runtime->period_size * 2 / runtime->rate;
|
|
wait_time = max(t, wait_time);
|
|
}
|
|
wait_time = msecs_to_jiffies(wait_time * 1000);
|
|
}
|
|
|
|
for (;;) {
|
|
if (signal_pending(current)) {
|
|
err = -ERESTARTSYS;
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* We need to check if space became available already
|
|
* (and thus the wakeup happened already) first to close
|
|
* the race of space already having become available.
|
|
* This check must happen after been added to the waitqueue
|
|
* and having current state be INTERRUPTIBLE.
|
|
*/
|
|
if (is_playback)
|
|
avail = snd_pcm_playback_avail(runtime);
|
|
else
|
|
avail = snd_pcm_capture_avail(runtime);
|
|
if (avail >= runtime->twake)
|
|
break;
|
|
snd_pcm_stream_unlock_irq(substream);
|
|
|
|
tout = schedule_timeout(wait_time);
|
|
|
|
snd_pcm_stream_lock_irq(substream);
|
|
set_current_state(TASK_INTERRUPTIBLE);
|
|
switch (runtime->status->state) {
|
|
case SNDRV_PCM_STATE_SUSPENDED:
|
|
err = -ESTRPIPE;
|
|
goto _endloop;
|
|
case SNDRV_PCM_STATE_XRUN:
|
|
err = -EPIPE;
|
|
goto _endloop;
|
|
case SNDRV_PCM_STATE_DRAINING:
|
|
if (is_playback)
|
|
err = -EPIPE;
|
|
else
|
|
avail = 0; /* indicate draining */
|
|
goto _endloop;
|
|
case SNDRV_PCM_STATE_OPEN:
|
|
case SNDRV_PCM_STATE_SETUP:
|
|
case SNDRV_PCM_STATE_DISCONNECTED:
|
|
err = -EBADFD;
|
|
goto _endloop;
|
|
}
|
|
if (!tout) {
|
|
snd_printd("%s write error (DMA or IRQ trouble?)\n",
|
|
is_playback ? "playback" : "capture");
|
|
err = -EIO;
|
|
break;
|
|
}
|
|
}
|
|
_endloop:
|
|
set_current_state(TASK_RUNNING);
|
|
remove_wait_queue(&runtime->tsleep, &wait);
|
|
*availp = avail;
|
|
return err;
|
|
}
|
|
|
|
static int snd_pcm_lib_write_transfer(struct snd_pcm_substream *substream,
|
|
unsigned int hwoff,
|
|
unsigned long data, unsigned int off,
|
|
snd_pcm_uframes_t frames)
|
|
{
|
|
struct snd_pcm_runtime *runtime = substream->runtime;
|
|
int err;
|
|
char __user *buf = (char __user *) data + frames_to_bytes(runtime, off);
|
|
if (substream->ops->copy) {
|
|
if ((err = substream->ops->copy(substream, -1, hwoff, buf, frames)) < 0)
|
|
return err;
|
|
} else {
|
|
char *hwbuf = runtime->dma_area + frames_to_bytes(runtime, hwoff);
|
|
if (copy_from_user(hwbuf, buf, frames_to_bytes(runtime, frames)))
|
|
return -EFAULT;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
typedef int (*transfer_f)(struct snd_pcm_substream *substream, unsigned int hwoff,
|
|
unsigned long data, unsigned int off,
|
|
snd_pcm_uframes_t size);
|
|
|
|
static snd_pcm_sframes_t snd_pcm_lib_write1(struct snd_pcm_substream *substream,
|
|
unsigned long data,
|
|
snd_pcm_uframes_t size,
|
|
int nonblock,
|
|
transfer_f transfer)
|
|
{
|
|
struct snd_pcm_runtime *runtime = substream->runtime;
|
|
snd_pcm_uframes_t xfer = 0;
|
|
snd_pcm_uframes_t offset = 0;
|
|
snd_pcm_uframes_t avail;
|
|
int err = 0;
|
|
|
|
if (size == 0)
|
|
return 0;
|
|
|
|
snd_pcm_stream_lock_irq(substream);
|
|
switch (runtime->status->state) {
|
|
case SNDRV_PCM_STATE_PREPARED:
|
|
case SNDRV_PCM_STATE_RUNNING:
|
|
case SNDRV_PCM_STATE_PAUSED:
|
|
break;
|
|
case SNDRV_PCM_STATE_XRUN:
|
|
err = -EPIPE;
|
|
goto _end_unlock;
|
|
case SNDRV_PCM_STATE_SUSPENDED:
|
|
err = -ESTRPIPE;
|
|
goto _end_unlock;
|
|
default:
|
|
err = -EBADFD;
|
|
goto _end_unlock;
|
|
}
|
|
|
|
runtime->twake = runtime->control->avail_min ? : 1;
|
|
if (runtime->status->state == SNDRV_PCM_STATE_RUNNING)
|
|
snd_pcm_update_hw_ptr(substream);
|
|
avail = snd_pcm_playback_avail(runtime);
|
|
while (size > 0) {
|
|
snd_pcm_uframes_t frames, appl_ptr, appl_ofs;
|
|
snd_pcm_uframes_t cont;
|
|
if (!avail) {
|
|
if (nonblock) {
|
|
err = -EAGAIN;
|
|
goto _end_unlock;
|
|
}
|
|
runtime->twake = min_t(snd_pcm_uframes_t, size,
|
|
runtime->control->avail_min ? : 1);
|
|
err = wait_for_avail(substream, &avail);
|
|
if (err < 0)
|
|
goto _end_unlock;
|
|
}
|
|
frames = size > avail ? avail : size;
|
|
cont = runtime->buffer_size - runtime->control->appl_ptr % runtime->buffer_size;
|
|
if (frames > cont)
|
|
frames = cont;
|
|
if (snd_BUG_ON(!frames)) {
|
|
runtime->twake = 0;
|
|
snd_pcm_stream_unlock_irq(substream);
|
|
return -EINVAL;
|
|
}
|
|
appl_ptr = runtime->control->appl_ptr;
|
|
appl_ofs = appl_ptr % runtime->buffer_size;
|
|
snd_pcm_stream_unlock_irq(substream);
|
|
err = transfer(substream, appl_ofs, data, offset, frames);
|
|
snd_pcm_stream_lock_irq(substream);
|
|
if (err < 0)
|
|
goto _end_unlock;
|
|
switch (runtime->status->state) {
|
|
case SNDRV_PCM_STATE_XRUN:
|
|
err = -EPIPE;
|
|
goto _end_unlock;
|
|
case SNDRV_PCM_STATE_SUSPENDED:
|
|
err = -ESTRPIPE;
|
|
goto _end_unlock;
|
|
default:
|
|
break;
|
|
}
|
|
appl_ptr += frames;
|
|
if (appl_ptr >= runtime->boundary)
|
|
appl_ptr -= runtime->boundary;
|
|
runtime->control->appl_ptr = appl_ptr;
|
|
if (substream->ops->ack)
|
|
substream->ops->ack(substream);
|
|
|
|
offset += frames;
|
|
size -= frames;
|
|
xfer += frames;
|
|
avail -= frames;
|
|
if (runtime->status->state == SNDRV_PCM_STATE_PREPARED &&
|
|
snd_pcm_playback_hw_avail(runtime) >= (snd_pcm_sframes_t)runtime->start_threshold) {
|
|
err = snd_pcm_start(substream);
|
|
if (err < 0)
|
|
goto _end_unlock;
|
|
}
|
|
}
|
|
_end_unlock:
|
|
runtime->twake = 0;
|
|
if (xfer > 0 && err >= 0)
|
|
snd_pcm_update_state(substream, runtime);
|
|
snd_pcm_stream_unlock_irq(substream);
|
|
return xfer > 0 ? (snd_pcm_sframes_t)xfer : err;
|
|
}
|
|
|
|
/* sanity-check for read/write methods */
|
|
static int pcm_sanity_check(struct snd_pcm_substream *substream)
|
|
{
|
|
struct snd_pcm_runtime *runtime;
|
|
if (PCM_RUNTIME_CHECK(substream))
|
|
return -ENXIO;
|
|
runtime = substream->runtime;
|
|
if (snd_BUG_ON(!substream->ops->copy && !runtime->dma_area))
|
|
return -EINVAL;
|
|
if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
|
|
return -EBADFD;
|
|
return 0;
|
|
}
|
|
|
|
snd_pcm_sframes_t snd_pcm_lib_write(struct snd_pcm_substream *substream, const void __user *buf, snd_pcm_uframes_t size)
|
|
{
|
|
struct snd_pcm_runtime *runtime;
|
|
int nonblock;
|
|
int err;
|
|
|
|
err = pcm_sanity_check(substream);
|
|
if (err < 0)
|
|
return err;
|
|
runtime = substream->runtime;
|
|
nonblock = !!(substream->f_flags & O_NONBLOCK);
|
|
|
|
if (runtime->access != SNDRV_PCM_ACCESS_RW_INTERLEAVED &&
|
|
runtime->channels > 1)
|
|
return -EINVAL;
|
|
return snd_pcm_lib_write1(substream, (unsigned long)buf, size, nonblock,
|
|
snd_pcm_lib_write_transfer);
|
|
}
|
|
|
|
EXPORT_SYMBOL(snd_pcm_lib_write);
|
|
|
|
static int snd_pcm_lib_writev_transfer(struct snd_pcm_substream *substream,
|
|
unsigned int hwoff,
|
|
unsigned long data, unsigned int off,
|
|
snd_pcm_uframes_t frames)
|
|
{
|
|
struct snd_pcm_runtime *runtime = substream->runtime;
|
|
int err;
|
|
void __user **bufs = (void __user **)data;
|
|
int channels = runtime->channels;
|
|
int c;
|
|
if (substream->ops->copy) {
|
|
if (snd_BUG_ON(!substream->ops->silence))
|
|
return -EINVAL;
|
|
for (c = 0; c < channels; ++c, ++bufs) {
|
|
if (*bufs == NULL) {
|
|
if ((err = substream->ops->silence(substream, c, hwoff, frames)) < 0)
|
|
return err;
|
|
} else {
|
|
char __user *buf = *bufs + samples_to_bytes(runtime, off);
|
|
if ((err = substream->ops->copy(substream, c, hwoff, buf, frames)) < 0)
|
|
return err;
|
|
}
|
|
}
|
|
} else {
|
|
/* default transfer behaviour */
|
|
size_t dma_csize = runtime->dma_bytes / channels;
|
|
for (c = 0; c < channels; ++c, ++bufs) {
|
|
char *hwbuf = runtime->dma_area + (c * dma_csize) + samples_to_bytes(runtime, hwoff);
|
|
if (*bufs == NULL) {
|
|
snd_pcm_format_set_silence(runtime->format, hwbuf, frames);
|
|
} else {
|
|
char __user *buf = *bufs + samples_to_bytes(runtime, off);
|
|
if (copy_from_user(hwbuf, buf, samples_to_bytes(runtime, frames)))
|
|
return -EFAULT;
|
|
}
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
snd_pcm_sframes_t snd_pcm_lib_writev(struct snd_pcm_substream *substream,
|
|
void __user **bufs,
|
|
snd_pcm_uframes_t frames)
|
|
{
|
|
struct snd_pcm_runtime *runtime;
|
|
int nonblock;
|
|
int err;
|
|
|
|
err = pcm_sanity_check(substream);
|
|
if (err < 0)
|
|
return err;
|
|
runtime = substream->runtime;
|
|
nonblock = !!(substream->f_flags & O_NONBLOCK);
|
|
|
|
if (runtime->access != SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
|
|
return -EINVAL;
|
|
return snd_pcm_lib_write1(substream, (unsigned long)bufs, frames,
|
|
nonblock, snd_pcm_lib_writev_transfer);
|
|
}
|
|
|
|
EXPORT_SYMBOL(snd_pcm_lib_writev);
|
|
|
|
static int snd_pcm_lib_read_transfer(struct snd_pcm_substream *substream,
|
|
unsigned int hwoff,
|
|
unsigned long data, unsigned int off,
|
|
snd_pcm_uframes_t frames)
|
|
{
|
|
struct snd_pcm_runtime *runtime = substream->runtime;
|
|
int err;
|
|
char __user *buf = (char __user *) data + frames_to_bytes(runtime, off);
|
|
if (substream->ops->copy) {
|
|
if ((err = substream->ops->copy(substream, -1, hwoff, buf, frames)) < 0)
|
|
return err;
|
|
} else {
|
|
char *hwbuf = runtime->dma_area + frames_to_bytes(runtime, hwoff);
|
|
if (copy_to_user(buf, hwbuf, frames_to_bytes(runtime, frames)))
|
|
return -EFAULT;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static snd_pcm_sframes_t snd_pcm_lib_read1(struct snd_pcm_substream *substream,
|
|
unsigned long data,
|
|
snd_pcm_uframes_t size,
|
|
int nonblock,
|
|
transfer_f transfer)
|
|
{
|
|
struct snd_pcm_runtime *runtime = substream->runtime;
|
|
snd_pcm_uframes_t xfer = 0;
|
|
snd_pcm_uframes_t offset = 0;
|
|
snd_pcm_uframes_t avail;
|
|
int err = 0;
|
|
|
|
if (size == 0)
|
|
return 0;
|
|
|
|
snd_pcm_stream_lock_irq(substream);
|
|
switch (runtime->status->state) {
|
|
case SNDRV_PCM_STATE_PREPARED:
|
|
if (size >= runtime->start_threshold) {
|
|
err = snd_pcm_start(substream);
|
|
if (err < 0)
|
|
goto _end_unlock;
|
|
}
|
|
break;
|
|
case SNDRV_PCM_STATE_DRAINING:
|
|
case SNDRV_PCM_STATE_RUNNING:
|
|
case SNDRV_PCM_STATE_PAUSED:
|
|
break;
|
|
case SNDRV_PCM_STATE_XRUN:
|
|
err = -EPIPE;
|
|
goto _end_unlock;
|
|
case SNDRV_PCM_STATE_SUSPENDED:
|
|
err = -ESTRPIPE;
|
|
goto _end_unlock;
|
|
default:
|
|
err = -EBADFD;
|
|
goto _end_unlock;
|
|
}
|
|
|
|
runtime->twake = runtime->control->avail_min ? : 1;
|
|
if (runtime->status->state == SNDRV_PCM_STATE_RUNNING)
|
|
snd_pcm_update_hw_ptr(substream);
|
|
avail = snd_pcm_capture_avail(runtime);
|
|
while (size > 0) {
|
|
snd_pcm_uframes_t frames, appl_ptr, appl_ofs;
|
|
snd_pcm_uframes_t cont;
|
|
if (!avail) {
|
|
if (runtime->status->state ==
|
|
SNDRV_PCM_STATE_DRAINING) {
|
|
snd_pcm_stop(substream, SNDRV_PCM_STATE_SETUP);
|
|
goto _end_unlock;
|
|
}
|
|
if (nonblock) {
|
|
err = -EAGAIN;
|
|
goto _end_unlock;
|
|
}
|
|
runtime->twake = min_t(snd_pcm_uframes_t, size,
|
|
runtime->control->avail_min ? : 1);
|
|
err = wait_for_avail(substream, &avail);
|
|
if (err < 0)
|
|
goto _end_unlock;
|
|
if (!avail)
|
|
continue; /* draining */
|
|
}
|
|
frames = size > avail ? avail : size;
|
|
cont = runtime->buffer_size - runtime->control->appl_ptr % runtime->buffer_size;
|
|
if (frames > cont)
|
|
frames = cont;
|
|
if (snd_BUG_ON(!frames)) {
|
|
runtime->twake = 0;
|
|
snd_pcm_stream_unlock_irq(substream);
|
|
return -EINVAL;
|
|
}
|
|
appl_ptr = runtime->control->appl_ptr;
|
|
appl_ofs = appl_ptr % runtime->buffer_size;
|
|
snd_pcm_stream_unlock_irq(substream);
|
|
err = transfer(substream, appl_ofs, data, offset, frames);
|
|
snd_pcm_stream_lock_irq(substream);
|
|
if (err < 0)
|
|
goto _end_unlock;
|
|
switch (runtime->status->state) {
|
|
case SNDRV_PCM_STATE_XRUN:
|
|
err = -EPIPE;
|
|
goto _end_unlock;
|
|
case SNDRV_PCM_STATE_SUSPENDED:
|
|
err = -ESTRPIPE;
|
|
goto _end_unlock;
|
|
default:
|
|
break;
|
|
}
|
|
appl_ptr += frames;
|
|
if (appl_ptr >= runtime->boundary)
|
|
appl_ptr -= runtime->boundary;
|
|
runtime->control->appl_ptr = appl_ptr;
|
|
if (substream->ops->ack)
|
|
substream->ops->ack(substream);
|
|
|
|
offset += frames;
|
|
size -= frames;
|
|
xfer += frames;
|
|
avail -= frames;
|
|
}
|
|
_end_unlock:
|
|
runtime->twake = 0;
|
|
if (xfer > 0 && err >= 0)
|
|
snd_pcm_update_state(substream, runtime);
|
|
snd_pcm_stream_unlock_irq(substream);
|
|
return xfer > 0 ? (snd_pcm_sframes_t)xfer : err;
|
|
}
|
|
|
|
snd_pcm_sframes_t snd_pcm_lib_read(struct snd_pcm_substream *substream, void __user *buf, snd_pcm_uframes_t size)
|
|
{
|
|
struct snd_pcm_runtime *runtime;
|
|
int nonblock;
|
|
int err;
|
|
|
|
err = pcm_sanity_check(substream);
|
|
if (err < 0)
|
|
return err;
|
|
runtime = substream->runtime;
|
|
nonblock = !!(substream->f_flags & O_NONBLOCK);
|
|
if (runtime->access != SNDRV_PCM_ACCESS_RW_INTERLEAVED)
|
|
return -EINVAL;
|
|
return snd_pcm_lib_read1(substream, (unsigned long)buf, size, nonblock, snd_pcm_lib_read_transfer);
|
|
}
|
|
|
|
EXPORT_SYMBOL(snd_pcm_lib_read);
|
|
|
|
static int snd_pcm_lib_readv_transfer(struct snd_pcm_substream *substream,
|
|
unsigned int hwoff,
|
|
unsigned long data, unsigned int off,
|
|
snd_pcm_uframes_t frames)
|
|
{
|
|
struct snd_pcm_runtime *runtime = substream->runtime;
|
|
int err;
|
|
void __user **bufs = (void __user **)data;
|
|
int channels = runtime->channels;
|
|
int c;
|
|
if (substream->ops->copy) {
|
|
for (c = 0; c < channels; ++c, ++bufs) {
|
|
char __user *buf;
|
|
if (*bufs == NULL)
|
|
continue;
|
|
buf = *bufs + samples_to_bytes(runtime, off);
|
|
if ((err = substream->ops->copy(substream, c, hwoff, buf, frames)) < 0)
|
|
return err;
|
|
}
|
|
} else {
|
|
snd_pcm_uframes_t dma_csize = runtime->dma_bytes / channels;
|
|
for (c = 0; c < channels; ++c, ++bufs) {
|
|
char *hwbuf;
|
|
char __user *buf;
|
|
if (*bufs == NULL)
|
|
continue;
|
|
|
|
hwbuf = runtime->dma_area + (c * dma_csize) + samples_to_bytes(runtime, hwoff);
|
|
buf = *bufs + samples_to_bytes(runtime, off);
|
|
if (copy_to_user(buf, hwbuf, samples_to_bytes(runtime, frames)))
|
|
return -EFAULT;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
snd_pcm_sframes_t snd_pcm_lib_readv(struct snd_pcm_substream *substream,
|
|
void __user **bufs,
|
|
snd_pcm_uframes_t frames)
|
|
{
|
|
struct snd_pcm_runtime *runtime;
|
|
int nonblock;
|
|
int err;
|
|
|
|
err = pcm_sanity_check(substream);
|
|
if (err < 0)
|
|
return err;
|
|
runtime = substream->runtime;
|
|
if (runtime->status->state == SNDRV_PCM_STATE_OPEN)
|
|
return -EBADFD;
|
|
|
|
nonblock = !!(substream->f_flags & O_NONBLOCK);
|
|
if (runtime->access != SNDRV_PCM_ACCESS_RW_NONINTERLEAVED)
|
|
return -EINVAL;
|
|
return snd_pcm_lib_read1(substream, (unsigned long)bufs, frames, nonblock, snd_pcm_lib_readv_transfer);
|
|
}
|
|
|
|
EXPORT_SYMBOL(snd_pcm_lib_readv);
|