diff options
Diffstat (limited to 'sound/virtio/virtio_pcm.h')
| -rw-r--r-- | sound/virtio/virtio_pcm.h | 40 |
1 files changed, 40 insertions, 0 deletions
diff --git a/sound/virtio/virtio_pcm.h b/sound/virtio/virtio_pcm.h index 84f2f3f14f48..6722f1139666 100644 --- a/sound/virtio/virtio_pcm.h +++ b/sound/virtio/virtio_pcm.h @@ -23,6 +23,17 @@ struct virtio_pcm_msg; * @substream: Kernel ALSA substream. * @hw: Kernel ALSA substream hardware descriptor. * @elapsed_period: Kernel work to handle the elapsed period state. + * @lock: Spinlock that protects fields shared by interrupt handlers and + * substream operators. + * @buffer_bytes: Current buffer size in bytes. + * @hw_ptr: Substream hardware pointer value in bytes [0 ... buffer_bytes). + * @xfer_enabled: Data transfer state (0 - off, 1 - on). + * @xfer_xrun: Data underflow/overflow state (0 - no xrun, 1 - xrun). + * @msgs: Allocated I/O messages. + * @nmsgs: Number of allocated I/O messages. + * @msg_last_enqueued: Index of the last I/O message added to the virtqueue. + * @msg_count: Number of pending I/O messages in the virtqueue. + * @msg_empty: Notify when msg_count is zero. */ struct virtio_pcm_substream { struct virtio_snd *snd; @@ -33,6 +44,16 @@ struct virtio_pcm_substream { struct snd_pcm_substream *substream; struct snd_pcm_hardware hw; struct work_struct elapsed_period; + spinlock_t lock; + size_t buffer_bytes; + size_t hw_ptr; + bool xfer_enabled; + bool xfer_xrun; + struct virtio_pcm_msg **msgs; + unsigned int nmsgs; + int msg_last_enqueued; + unsigned int msg_count; + wait_queue_head_t msg_empty; }; /** @@ -65,8 +86,27 @@ int virtsnd_pcm_parse_cfg(struct virtio_snd *snd); int virtsnd_pcm_build_devs(struct virtio_snd *snd); +void virtsnd_pcm_event(struct virtio_snd *snd, struct virtio_snd_event *event); + +void virtsnd_pcm_tx_notify_cb(struct virtqueue *vqueue); + +void virtsnd_pcm_rx_notify_cb(struct virtqueue *vqueue); + struct virtio_pcm *virtsnd_pcm_find(struct virtio_snd *snd, u32 nid); struct virtio_pcm *virtsnd_pcm_find_or_create(struct virtio_snd *snd, u32 nid); +struct virtio_snd_msg * +virtsnd_pcm_ctl_msg_alloc(struct virtio_pcm_substream *vss, + unsigned int command, gfp_t gfp); + +int virtsnd_pcm_msg_alloc(struct virtio_pcm_substream *vss, + unsigned int periods, unsigned int period_bytes); + +void virtsnd_pcm_msg_free(struct virtio_pcm_substream *vss); + +int virtsnd_pcm_msg_send(struct virtio_pcm_substream *vss); + +unsigned int virtsnd_pcm_msg_pending_num(struct virtio_pcm_substream *vss); + #endif /* VIRTIO_SND_PCM_H */ |