| Shuah Khan | 66354f1 | 2019-04-01 20:40:22 -0400 | [diff] [blame] | 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 */ |