1 /* SPDX-License-Identifier: GPL-2.0+ */
3 * media.h - Media Controller specific ALSA driver code
5 * Copyright (c) 2019 Shuah Khan <shuah@kernel.org>
10 * This file adds Media Controller support to the ALSA driver
11 * to use the Media Controller API to share the tuner with DVB
12 * and V4L2 drivers that control the media device.
14 * The media device is created based on the existing quirks framework.
15 * Using this approach, the media controller API usage can be added for
20 #ifdef CONFIG_SND_USB_AUDIO_USE_MEDIA_CONTROLLER
22 #include <linux/media.h>
23 #include <media/media-device.h>
24 #include <media/media-entity.h>
25 #include <media/media-dev-allocator.h>
26 #include <sound/asound.h>
29 struct media_device *media_dev;
30 struct media_entity media_entity;
31 struct media_intf_devnode *intf_devnode;
32 struct media_link *intf_link;
33 struct media_pad media_pad;
34 struct media_pipeline media_pipe;
38 * One source pad each for SNDRV_PCM_STREAM_CAPTURE and
39 * SNDRV_PCM_STREAM_PLAYBACK. One for sink pad to link
42 #define MEDIA_MIXER_PAD_MAX (SNDRV_PCM_STREAM_LAST + 2)
44 struct media_mixer_ctl {
45 struct media_device *media_dev;
46 struct media_entity media_entity;
47 struct media_intf_devnode *intf_devnode;
48 struct media_link *intf_link;
49 struct media_pad media_pad[MEDIA_MIXER_PAD_MAX];
50 struct media_pipeline media_pipe;
53 int snd_media_device_create(struct snd_usb_audio *chip,
54 struct usb_interface *iface);
55 void snd_media_device_delete(struct snd_usb_audio *chip);
56 int snd_media_stream_init(struct snd_usb_substream *subs, struct snd_pcm *pcm,
58 void snd_media_stream_delete(struct snd_usb_substream *subs);
59 int snd_media_start_pipeline(struct snd_usb_substream *subs);
60 void snd_media_stop_pipeline(struct snd_usb_substream *subs);
62 static inline int snd_media_device_create(struct snd_usb_audio *chip,
63 struct usb_interface *iface)
65 static inline void snd_media_device_delete(struct snd_usb_audio *chip) { }
66 static inline int snd_media_stream_init(struct snd_usb_substream *subs,
67 struct snd_pcm *pcm, int stream)
69 static inline void snd_media_stream_delete(struct snd_usb_substream *subs) { }
70 static inline int snd_media_start_pipeline(struct snd_usb_substream *subs)
72 static inline void snd_media_stop_pipeline(struct snd_usb_substream *subs) { }
74 #endif /* __MEDIA_H */