ALSA打開數(shù)據(jù)流程?
????soc_pcm_open => cpu_dai->driver->ops->startup => platform->driver->ops->open => codec_dai->driver->ops->startup \
????=> rtd->dai_link->ops->startup ?
?
????ALSA的HW_param流程?
????soc_pcm_hw_params => rtd->dai_link->ops->hw_params => codec_dai->driver->ops->hw_params => cpu_dai->driver->ops->hw_params \
????=> platform->driver->ops->hw_params?
?
????ALSA的Prepare流程?
????snd_pcm_prepare => snd_pcm_action_nonatomic => snd_pcm_action_group => snd_pcm_do_prepare => substream->ops->prepare \
????=> soc_pcm_prepare => rtd->dai_link->ops->prepare => platform->driver->ops->prepare => codec_dai->driver->ops->prepare \
???????????=> cpu_dai->driver->ops->prepare ?
?
????ALSA的Write流程?
????snd_pcm_playback_ioctl => snd_pcm_playback_ioctl1 => SNDRV_PCM_IOCTL_WRITEN_FRAMES => snd_pcm_lib_writev => snd_pcm_lib_write1 \
????=> |||| =>??snd_pcm_lib_writev_transfer => copy_from_user [copy user speace data to dma] ?
????snd_pcm_start => snd_pcm_action => snd_pcm_action_group => snd_pcm_do_start =>??substream->ops->trigger
?
????ALSA的Trigger流程?
????substream->ops->trigger => soc_pcm_trigger => codec_dai->driver->ops->trigger => platform->driver->ops->trigger \
????=> cpu_dai->driver->ops->trigger?
?????
????ALSA的cset流程?
????snd_ctl_ioctl => SNDRV_CTL_IOCTL_ELEM_WRITE => snd_ctl_elem_write_user => snd_ctl_elem_write => kctl->put => codec->write
---------------------?
作者：dyron?
來源：CSDN?
原文：https://blog.csdn.net/dyron/article/details/8154725?
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