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Viewing changes to core/pcm_timer.c

  • Committer: Canonistack server
  • Date: 2015-01-22 13:04:34 UTC
  • Revision ID: david.henningsson@canonical.com-20150122130434-q48cfdp8ovzgqhe7
Test run of 623 machines: 3 failing with 3 errors and 0 warnings.

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core/pcm_timer.c
 
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/*
 
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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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 *
 
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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/time.h>
 
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#include <linux/gcd.h>
 
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#include <sound/core.h>
 
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#include <sound/pcm.h>
 
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#include <sound/timer.h>
 
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/*
 
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 *  Timer functions
 
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 */
 
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void snd_pcm_timer_resolution_change(struct snd_pcm_substream *substream)
 
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{
 
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        unsigned long rate, mult, fsize, l, post;
 
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        struct snd_pcm_runtime *runtime = substream->runtime;
 
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        mult = 1000000000;
 
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        rate = runtime->rate;
 
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        if (snd_BUG_ON(!rate))
 
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                return;
 
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        l = gcd(mult, rate);
 
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        mult /= l;
 
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        rate /= l;
 
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        fsize = runtime->period_size;
 
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        if (snd_BUG_ON(!fsize))
 
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                return;
 
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        l = gcd(rate, fsize);
 
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        rate /= l;
 
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        fsize /= l;
 
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        post = 1;
 
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        while ((mult * fsize) / fsize != mult) {
 
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                mult /= 2;
 
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                post *= 2;
 
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        }
 
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        if (rate == 0) {
 
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                pcm_err(substream->pcm,
 
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                        "pcm timer resolution out of range (rate = %u, period_size = %lu)\n",
 
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                        runtime->rate, runtime->period_size);
 
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                runtime->timer_resolution = -1;
 
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                return;
 
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        }
 
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        runtime->timer_resolution = (mult * fsize / rate) * post;
 
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}
 
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static unsigned long snd_pcm_timer_resolution(struct snd_timer * timer)
 
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{
 
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        struct snd_pcm_substream *substream;
 
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        substream = timer->private_data;
 
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        return substream->runtime ? substream->runtime->timer_resolution : 0;
 
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}
 
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static int snd_pcm_timer_start(struct snd_timer * timer)
 
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{
 
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        struct snd_pcm_substream *substream;
 
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        substream = snd_timer_chip(timer);
 
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        substream->timer_running = 1;
 
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        return 0;
 
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}
 
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static int snd_pcm_timer_stop(struct snd_timer * timer)
 
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{
 
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        struct snd_pcm_substream *substream;
 
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        substream = snd_timer_chip(timer);
 
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        substream->timer_running = 0;
 
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        return 0;
 
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}
 
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static struct snd_timer_hardware snd_pcm_timer =
 
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{
 
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        .flags =        SNDRV_TIMER_HW_AUTO | SNDRV_TIMER_HW_SLAVE,
 
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        .resolution =   0,
 
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        .ticks =        1,
 
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        .c_resolution = snd_pcm_timer_resolution,
 
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        .start =        snd_pcm_timer_start,
 
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        .stop =         snd_pcm_timer_stop,
 
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};
 
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/*
 
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 *  Init functions
 
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 */
 
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static void snd_pcm_timer_free(struct snd_timer *timer)
 
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{
 
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        struct snd_pcm_substream *substream = timer->private_data;
 
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        substream->timer = NULL;
 
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}
 
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void snd_pcm_timer_init(struct snd_pcm_substream *substream)
 
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{
 
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        struct snd_timer_id tid;
 
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        struct snd_timer *timer;
 
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        tid.dev_sclass = SNDRV_TIMER_SCLASS_NONE;
 
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        tid.dev_class = SNDRV_TIMER_CLASS_PCM;
 
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        tid.card = substream->pcm->card->number;
 
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        tid.device = substream->pcm->device;
 
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        tid.subdevice = (substream->number << 1) | (substream->stream & 1);
 
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        if (snd_timer_new(substream->pcm->card, "PCM", &tid, &timer) < 0)
 
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                return;
 
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        sprintf(timer->name, "PCM %s %i-%i-%i",
 
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                        substream->stream == SNDRV_PCM_STREAM_CAPTURE ?
 
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                                "capture" : "playback",
 
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                        tid.card, tid.device, tid.subdevice);
 
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        timer->hw = snd_pcm_timer;
 
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        if (snd_device_register(timer->card, timer) < 0) {
 
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                snd_device_free(timer->card, timer);
 
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                return;
 
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        }
 
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        timer->private_data = substream;
 
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        timer->private_free = snd_pcm_timer_free;
 
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        substream->timer = timer;
 
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}
 
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void snd_pcm_timer_done(struct snd_pcm_substream *substream)
 
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{
 
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        if (substream->timer) {
 
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                snd_device_free(substream->pcm->card, substream->timer);
 
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                substream->timer = NULL;
 
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        }
 
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}