cregit-Linux how code gets into the kernel

Release 4.8 sound/core/pcm_timer.c

Directory: sound/core
/*
 *  Digital Audio (PCM) abstract layer
 *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
 *
 *
 *   This program is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation; either version 2 of the License, or
 *   (at your option) any later version.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *   GNU General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program; if not, write to the Free Software
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 *
 */

#include <linux/time.h>
#include <linux/gcd.h>
#include <sound/core.h>
#include <sound/pcm.h>
#include <sound/timer.h>

/*
 *  Timer functions
 */


void snd_pcm_timer_resolution_change(struct snd_pcm_substream *substream) { unsigned long rate, mult, fsize, l, post; struct snd_pcm_runtime *runtime = substream->runtime; mult = 1000000000; rate = runtime->rate; if (snd_BUG_ON(!rate)) return; l = gcd(mult, rate); mult /= l; rate /= l; fsize = runtime->period_size; if (snd_BUG_ON(!fsize)) return; l = gcd(rate, fsize); rate /= l; fsize /= l; post = 1; while ((mult * fsize) / fsize != mult) { mult /= 2; post *= 2; } if (rate == 0) { pcm_err(substream->pcm, "pcm timer resolution out of range (rate = %u, period_size = %lu)\n", runtime->rate, runtime->period_size); runtime->timer_resolution = -1; return; } runtime->timer_resolution = (mult * fsize / rate) * post; }

Contributors

PersonTokensPropCommitsCommitProp
jaroslav kyselajaroslav kysela14986.63%350.00%
takashi iwaitakashi iwai2313.37%350.00%
Total172100.00%6100.00%


static unsigned long snd_pcm_timer_resolution(struct snd_timer * timer) { struct snd_pcm_substream *substream; substream = timer->private_data; return substream->runtime ? substream->runtime->timer_resolution : 0; }

Contributors

PersonTokensPropCommitsCommitProp
jaroslav kyselajaroslav kysela3288.89%266.67%
takashi iwaitakashi iwai411.11%133.33%
Total36100.00%3100.00%


static int snd_pcm_timer_start(struct snd_timer * timer) { struct snd_pcm_substream *substream; substream = snd_timer_chip(timer); substream->timer_running = 1; return 0; }

Contributors

PersonTokensPropCommitsCommitProp
jaroslav kyselajaroslav kysela2887.50%150.00%
takashi iwaitakashi iwai412.50%150.00%
Total32100.00%2100.00%


static int snd_pcm_timer_stop(struct snd_timer * timer) { struct snd_pcm_substream *substream; substream = snd_timer_chip(timer); substream->timer_running = 0; return 0; }

Contributors

PersonTokensPropCommitsCommitProp
jaroslav kyselajaroslav kysela2887.50%150.00%
takashi iwaitakashi iwai412.50%150.00%
Total32100.00%2100.00%

static struct snd_timer_hardware snd_pcm_timer = { .flags = SNDRV_TIMER_HW_AUTO | SNDRV_TIMER_HW_SLAVE, .resolution = 0, .ticks = 1, .c_resolution = snd_pcm_timer_resolution, .start = snd_pcm_timer_start, .stop = snd_pcm_timer_stop, }; /* * Init functions */
static void snd_pcm_timer_free(struct snd_timer *timer) { struct snd_pcm_substream *substream = timer->private_data; substream->timer = NULL; }

Contributors

PersonTokensPropCommitsCommitProp
jaroslav kyselajaroslav kysela2284.62%266.67%
takashi iwaitakashi iwai415.38%133.33%
Total26100.00%3100.00%


void snd_pcm_timer_init(struct snd_pcm_substream *substream) { struct snd_timer_id tid; struct snd_timer *timer; tid.dev_sclass = SNDRV_TIMER_SCLASS_NONE; tid.dev_class = SNDRV_TIMER_CLASS_PCM; tid.card = substream->pcm->card->number; tid.device = substream->pcm->device; tid.subdevice = (substream->number << 1) | (substream->stream & 1); if (snd_timer_new(substream->pcm->card, "PCM", &tid, &timer) < 0) return; sprintf(timer->name, "PCM %s %i-%i-%i", substream->stream == SNDRV_PCM_STREAM_CAPTURE ? "capture" : "playback", tid.card, tid.device, tid.subdevice); timer->hw = snd_pcm_timer; if (snd_device_register(timer->card, timer) < 0) { snd_device_free(timer->card, timer); return; } timer->private_data = substream; timer->private_free = snd_pcm_timer_free; substream->timer = timer; }

Contributors

PersonTokensPropCommitsCommitProp
jaroslav kyselajaroslav kysela16996.57%150.00%
takashi iwaitakashi iwai63.43%150.00%
Total175100.00%2100.00%


void snd_pcm_timer_done(struct snd_pcm_substream *substream) { if (substream->timer) { snd_device_free(substream->pcm->card, substream->timer); substream->timer = NULL; } }

Contributors

PersonTokensPropCommitsCommitProp
jaroslav kyselajaroslav kysela3594.59%150.00%
takashi iwaitakashi iwai25.41%150.00%
Total37100.00%2100.00%


Overall Contributors

PersonTokensPropCommitsCommitProp
jaroslav kyselajaroslav kysela51691.01%763.64%
takashi iwaitakashi iwai488.47%327.27%
florian fainelliflorian fainelli30.53%19.09%
Total567100.00%11100.00%
Directory: sound/core
Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.