1 /* SPDX-License-Identifier: GPL-2.0+ */ 2 /* 3 * virtio-snd: Virtio sound device 4 * Copyright (C) 2021 OpenSynergy GmbH 5 */ 6 #ifndef VIRTIO_SND_CARD_H 7 #define VIRTIO_SND_CARD_H 8 9 #include <linux/slab.h> 10 #include <linux/virtio.h> 11 #include <sound/core.h> 12 #include <uapi/linux/virtio_snd.h> 13 14 #include "virtio_ctl_msg.h" 15 #include "virtio_pcm.h" 16 17 #define VIRTIO_SND_CARD_DRIVER "virtio-snd" 18 #define VIRTIO_SND_CARD_NAME "VirtIO SoundCard" 19 #define VIRTIO_SND_PCM_NAME "VirtIO PCM" 20 21 struct virtio_jack; 22 struct virtio_pcm_substream; 23 24 /** 25 * struct virtio_snd_queue - Virtqueue wrapper structure. 26 * @lock: Used to synchronize access to a virtqueue. 27 * @vqueue: Underlying virtqueue. 28 */ 29 struct virtio_snd_queue { 30 spinlock_t lock; 31 struct virtqueue *vqueue; 32 }; 33 34 /** 35 * struct virtio_snd - VirtIO sound card device. 36 * @vdev: Underlying virtio device. 37 * @queues: Virtqueue wrappers. 38 * @card: ALSA sound card. 39 * @ctl_msgs: Pending control request list. 40 * @event_msgs: Device events. 41 * @pcm_list: VirtIO PCM device list. 42 * @jacks: VirtIO jacks. 43 * @njacks: Number of jacks. 44 * @substreams: VirtIO PCM substreams. 45 * @nsubstreams: Number of PCM substreams. 46 * @chmaps: VirtIO channel maps. 47 * @nchmaps: Number of channel maps. 48 */ 49 struct virtio_snd { 50 struct virtio_device *vdev; 51 struct virtio_snd_queue queues[VIRTIO_SND_VQ_MAX]; 52 struct snd_card *card; 53 struct list_head ctl_msgs; 54 struct virtio_snd_event *event_msgs; 55 struct list_head pcm_list; 56 struct virtio_jack *jacks; 57 u32 njacks; 58 struct virtio_pcm_substream *substreams; 59 u32 nsubstreams; 60 struct virtio_snd_chmap_info *chmaps; 61 u32 nchmaps; 62 }; 63 64 /* Message completion timeout in milliseconds (module parameter). */ 65 extern u32 virtsnd_msg_timeout_ms; 66 67 static inline struct virtio_snd_queue * 68 virtsnd_control_queue(struct virtio_snd *snd) 69 { 70 return &snd->queues[VIRTIO_SND_VQ_CONTROL]; 71 } 72 73 static inline struct virtio_snd_queue * 74 virtsnd_event_queue(struct virtio_snd *snd) 75 { 76 return &snd->queues[VIRTIO_SND_VQ_EVENT]; 77 } 78 79 static inline struct virtio_snd_queue * 80 virtsnd_tx_queue(struct virtio_snd *snd) 81 { 82 return &snd->queues[VIRTIO_SND_VQ_TX]; 83 } 84 85 static inline struct virtio_snd_queue * 86 virtsnd_rx_queue(struct virtio_snd *snd) 87 { 88 return &snd->queues[VIRTIO_SND_VQ_RX]; 89 } 90 91 static inline struct virtio_snd_queue * 92 virtsnd_pcm_queue(struct virtio_pcm_substream *vss) 93 { 94 if (vss->direction == SNDRV_PCM_STREAM_PLAYBACK) 95 return virtsnd_tx_queue(vss->snd); 96 else 97 return virtsnd_rx_queue(vss->snd); 98 } 99 100 int virtsnd_jack_parse_cfg(struct virtio_snd *snd); 101 102 int virtsnd_jack_build_devs(struct virtio_snd *snd); 103 104 void virtsnd_jack_event(struct virtio_snd *snd, 105 struct virtio_snd_event *event); 106 107 int virtsnd_chmap_parse_cfg(struct virtio_snd *snd); 108 109 int virtsnd_chmap_build_devs(struct virtio_snd *snd); 110 111 #endif /* VIRTIO_SND_CARD_H */ 112