/* common PCM hw_params callback */ int snd_line6_hw_params(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *hw_params) { int ret; struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream); struct line6_pcm_stream *pstr = get_stream(line6pcm, substream->stream); mutex_lock(&line6pcm->state_mutex); ret = line6_buffer_acquire(line6pcm, pstr, substream->stream, LINE6_STREAM_PCM); if (ret < 0) goto error; ret = snd_pcm_lib_malloc_pages(substream, params_buffer_bytes(hw_params)); if (ret < 0) { line6_buffer_release(line6pcm, pstr, LINE6_STREAM_PCM); goto error; } pstr->period = params_period_bytes(hw_params); error: mutex_unlock(&line6pcm->state_mutex); return ret; }
/* common PCM hw_free callback */ int snd_line6_hw_free(struct snd_pcm_substream *substream) { struct snd_line6_pcm *line6pcm = snd_pcm_substream_chip(substream); struct line6_pcm_stream *pstr = get_stream(line6pcm, substream->stream); mutex_lock(&line6pcm->state_mutex); line6_buffer_release(line6pcm, pstr, LINE6_STREAM_PCM); mutex_unlock(&line6pcm->state_mutex); return snd_pcm_lib_free_pages(substream); }
/* Stop and release duplex streams */ void line6_pcm_release(struct snd_line6_pcm *line6pcm, int type) { struct line6_pcm_stream *pstr; int dir; mutex_lock(&line6pcm->state_mutex); for (dir = 0; dir < 2; dir++) line6_stream_stop(line6pcm, dir, type); for (dir = 0; dir < 2; dir++) { pstr = get_stream(line6pcm, dir); line6_buffer_release(line6pcm, pstr, type); } mutex_unlock(&line6pcm->state_mutex); }