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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>
This commit is contained in:
Takashi Sakamoto 2019-06-02 16:12:52 +09:00 committed by Takashi Iwai
parent d8f291b7b8
commit 47b87c8ed0
2 changed files with 5 additions and 0 deletions
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4
sound/firewire/fireface/ff-stream.c
View File

@ -156,6 +156,10 @@ int snd_ff_stream_start_duplex(struct snd_ff *ff, unsigned int rate)
if (err < 0)
return err;
err = ff->spec->protocol->allocate_resources(ff, rate);
if (err < 0)
goto error;
err = ff->spec->protocol->begin_session(ff, rate);
if (err < 0)
goto error;

1
sound/firewire/fireface/ff.h
View File

@ -113,6 +113,7 @@ struct snd_ff_protocol {
int (*get_clock)(struct snd_ff *ff, unsigned int *rate,
enum snd_ff_clock_src *src);
int (*switch_fetching_mode)(struct snd_ff *ff, bool enable);
int (*allocate_resources)(struct snd_ff *ff, unsigned int rate);
int (*begin_session)(struct snd_ff *ff, unsigned int rate);
void (*finish_session)(struct snd_ff *ff);
void (*dump_status)(struct snd_ff *ff, struct snd_info_buffer *buffer);