sound/virtio/virtio_ctl_msg.h

   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_MSG_H
   7 #define VIRTIO_SND_MSG_H
   8
   9 #include <linux/atomic.h>
  10 #include <linux/virtio.h>
  11
  12 struct virtio_snd;
  13 struct virtio_snd_msg;
  14
  15 void virtsnd_ctl_msg_ref(struct virtio_snd_msg *msg);
  16
  17 void virtsnd_ctl_msg_unref(struct virtio_snd_msg *msg);
  18
  19 void *virtsnd_ctl_msg_request(struct virtio_snd_msg *msg);
  20
  21 void *virtsnd_ctl_msg_response(struct virtio_snd_msg *msg);
  22
  23 struct virtio_snd_msg *virtsnd_ctl_msg_alloc(size_t request_size,
  24                                              size_t response_size, gfp_t gfp);
  25
  26 int virtsnd_ctl_msg_send(struct virtio_snd *snd, struct virtio_snd_msg *msg,
  27                          struct scatterlist *out_sgs,
  28                          struct scatterlist *in_sgs, bool nowait);
  29
  30 /**
  31  * virtsnd_ctl_msg_send_sync() - Simplified sending of synchronous message.
  32  * @snd: VirtIO sound device.
  33  * @msg: Control message.
  34  *
  35  * After returning from this function, the message will be deleted. If message
  36  * content is still needed, the caller must additionally to
  37  * virtsnd_ctl_msg_ref/unref() it.
  38  *
  39  * The msg_timeout_ms module parameter defines the message completion timeout.
  40  * If the message is not completed within this time, the function will return an
  41  * error.
  42  *
  43  * Context: Any context that permits to sleep.
  44  * Return: 0 on success, -errno on failure.
  45  *
  46  * The return value is a message status code (VIRTIO_SND_S_XXX) converted to an
  47  * appropriate -errno value.
  48  */
  49 static inline int virtsnd_ctl_msg_send_sync(struct virtio_snd *snd,
  50                                             struct virtio_snd_msg *msg)
  51 {
  52         return virtsnd_ctl_msg_send(snd, msg, NULL, NULL, false);
  53 }
  54
  55 /**
  56  * virtsnd_ctl_msg_send_async() - Simplified sending of asynchronous message.
  57  * @snd: VirtIO sound device.
  58  * @msg: Control message.
  59  *
  60  * Context: Any context.
  61  * Return: 0 on success, -errno on failure.
  62  */
  63 static inline int virtsnd_ctl_msg_send_async(struct virtio_snd *snd,
  64                                              struct virtio_snd_msg *msg)
  65 {
  66         return virtsnd_ctl_msg_send(snd, msg, NULL, NULL, true);
  67 }
  68
  69 void virtsnd_ctl_msg_cancel_all(struct virtio_snd *snd);
  70
  71 void virtsnd_ctl_msg_complete(struct virtio_snd_msg *msg);
  72
  73 int virtsnd_ctl_query_info(struct virtio_snd *snd, int command, int start_id,
  74                            int count, size_t size, void *info);
  75
  76 void virtsnd_ctl_notify_cb(struct virtqueue *vqueue);
  77
  78 #endif /* VIRTIO_SND_MSG_H */