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ALSA: fireface: add protocol-specific operation to allocate isochronous resources
This commit is a part of preparation to perform allocation/release of isochronous channels in pcm.hw_params/hw_free callbacks. In ALSA fireface driver, the allocation of isochronous resources is programmed in each implementation of protocol. This commit adds protocol-specific operation for the allocation separated from the operation to begin session. Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp> Signed-off-by: Takashi Iwai <tiwai@suse.de>
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2 changed files with 5 additions and 0 deletions
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@ -156,6 +156,10 @@ int snd_ff_stream_start_duplex(struct snd_ff *ff, unsigned int rate)
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if (err < 0)
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return err;
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err = ff->spec->protocol->allocate_resources(ff, rate);
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if (err < 0)
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goto error;
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err = ff->spec->protocol->begin_session(ff, rate);
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if (err < 0)
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goto error;
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@ -113,6 +113,7 @@ struct snd_ff_protocol {
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int (*get_clock)(struct snd_ff *ff, unsigned int *rate,
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enum snd_ff_clock_src *src);
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int (*switch_fetching_mode)(struct snd_ff *ff, bool enable);
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int (*allocate_resources)(struct snd_ff *ff, unsigned int rate);
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int (*begin_session)(struct snd_ff *ff, unsigned int rate);
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void (*finish_session)(struct snd_ff *ff);
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void (*dump_status)(struct snd_ff *ff, struct snd_info_buffer *buffer);
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