1 /* SPDX-License-Identifier: GPL-2.0+ */
2 /*
3 * media.h - Media Controller specific ALSA driver code
4 *
5 * Copyright (c) 2019 Shuah Khan <shuah@kernel.org>
6 *
7 */
8
9 /*
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.
13 *
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
16 * a specific device.
17 */
18 #ifndef __MEDIA_H
19
20 #ifdef CONFIG_SND_USB_AUDIO_USE_MEDIA_CONTROLLER
21
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>
27
28 struct media_ctl {
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;
35 };
36
37 /*
38 * One source pad each for SNDRV_PCM_STREAM_CAPTURE and
39 * SNDRV_PCM_STREAM_PLAYBACK. One for sink pad to link
40 * to AUDIO Source
41 */
42 #define MEDIA_MIXER_PAD_MAX (SNDRV_PCM_STREAM_LAST + 2)
43
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;
51 };
52
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,
57 int stream);
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);
61 #else
62 static inline int snd_media_device_create(struct snd_usb_audio *chip,
63 struct usb_interface *iface)
64 { return 0; }
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)
68 { return 0; }
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)
71 { return 0; }
72 static inline void snd_media_stop_pipeline(struct snd_usb_substream *subs) { }
73 #endif
74 #endif /* __MEDIA_H */
75
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