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ALSA: firewire-lib: add a kernel API to add AMDTP stream into AMDTP domain

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This commit adds a kernel API to insert AMDTP stream to list in AMDTP
domain.

Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Sakamoto 2019-08-04 15:21:22 +09:00 committed by Takashi Iwai
parent 6261f90bdb
commit 157a53eef6
2 changed files with 31 additions and 0 deletions
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26
sound/firewire/amdtp-stream.c
View File

@ -1159,6 +1159,32 @@ void amdtp_domain_destroy(struct amdtp_domain *d)
}
EXPORT_SYMBOL_GPL(amdtp_domain_destroy);
/**
* amdtp_domain_add_stream - register isoc context into the domain.
* @d: the AMDTP domain.
* @s: the AMDTP stream.
* @channel: the isochronous channel on the bus.
* @speed: firewire speed code.
*/
int amdtp_domain_add_stream(struct amdtp_domain *d, struct amdtp_stream *s,
int channel, int speed)
{
struct amdtp_stream *tmp;
list_for_each_entry(tmp, &d->streams, list) {
if (s == tmp)
return -EBUSY;
}
list_add(&s->list, &d->streams);
s->channel = channel;
s->speed = speed;
return 0;
}
EXPORT_SYMBOL_GPL(amdtp_domain_add_stream);
/**
* amdtp_domain_stop - stop sending packets for isoc context in the same domain.
* @d: the AMDTP domain to which the isoc contexts belong.

5
sound/firewire/amdtp-stream.h
View File

@ -172,6 +172,8 @@ struct amdtp_stream {
amdtp_stream_process_ctx_payloads_t process_ctx_payloads;
// For domain.
int channel;
int speed;
struct list_head list;
};
@ -277,6 +279,9 @@ struct amdtp_domain {
int amdtp_domain_init(struct amdtp_domain *d);
void amdtp_domain_destroy(struct amdtp_domain *d);
int amdtp_domain_add_stream(struct amdtp_domain *d, struct amdtp_stream *s,
int channel, int speed);
void amdtp_domain_stop(struct amdtp_domain *d);
#endif