diff options
Diffstat (limited to 'sound/hda')
| -rw-r--r-- | sound/hda/ext/hdac_ext_stream.c | 41 |
1 files changed, 41 insertions, 0 deletions
diff --git a/sound/hda/ext/hdac_ext_stream.c b/sound/hda/ext/hdac_ext_stream.c index 2a071a09224d..11b7119cc47e 100644 --- a/sound/hda/ext/hdac_ext_stream.c +++ b/sound/hda/ext/hdac_ext_stream.c @@ -14,6 +14,7 @@ #include <sound/pcm.h> #include <sound/hda_register.h> #include <sound/hdaudio_ext.h> +#include <sound/compress_driver.h> /** * snd_hdac_ext_stream_init - initialize each stream (aka device) @@ -367,3 +368,43 @@ void snd_hdac_ext_stream_release(struct hdac_ext_stream *hext_stream, int type) } EXPORT_SYMBOL_GPL(snd_hdac_ext_stream_release); + +/** + * snd_hdac_ext_cstream_assign - assign a host stream for compress + * @bus: HD-audio core bus + * @cstream: Compress stream to assign + * + * Assign an unused host stream for the given compress stream. + * If no stream is free, NULL is returned. Stream is decoupled + * before assignment. + */ +struct hdac_ext_stream *snd_hdac_ext_cstream_assign(struct hdac_bus *bus, + struct snd_compr_stream *cstream) +{ + struct hdac_ext_stream *res = NULL; + struct hdac_stream *hstream; + + spin_lock_irq(&bus->reg_lock); + list_for_each_entry(hstream, &bus->stream_list, list) { + struct hdac_ext_stream *hext_stream = stream_to_hdac_ext_stream(hstream); + + if (hstream->direction != cstream->direction) + continue; + + if (!hstream->opened) { + res = hext_stream; + break; + } + } + + if (res) { + snd_hdac_ext_stream_decouple_locked(bus, res, true); + res->hstream.opened = 1; + res->hstream.running = 0; + res->hstream.cstream = cstream; + } + spin_unlock_irq(&bus->reg_lock); + + return res; +} +EXPORT_SYMBOL_GPL(snd_hdac_ext_cstream_assign); |