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/* SPDX-License-Identifier: GPL-2.0+ */
/*
* media.h - Media Controller specific ALSA driver code
*
* Copyright (c) 2019 Shuah Khan <shuah@kernel.org>
*
*/
/*
* This file adds Media Controller support to the ALSA driver
* to use the Media Controller API to share the tuner with DVB
* and V4L2 drivers that control the media device.
*
* The media device is created based on the existing quirks framework.
* Using this approach, the media controller API usage can be added for
* a specific device.
*/
#ifndef __MEDIA_H
#ifdef CONFIG_SND_USB_AUDIO_USE_MEDIA_CONTROLLER
#include <linux/media.h>
#include <media/media-device.h>
#include <media/media-entity.h>
#include <media/media-dev-allocator.h>
#include <sound/asound.h>
struct media_ctl {
struct media_device *media_dev;
struct media_entity media_entity;
struct media_intf_devnode *intf_devnode;
struct media_link *intf_link;
struct media_pad media_pad;
struct media_pipeline media_pipe;
};
/*
* One source pad each for SNDRV_PCM_STREAM_CAPTURE and
* SNDRV_PCM_STREAM_PLAYBACK. One for sink pad to link
* to AUDIO Source
*/
#define MEDIA_MIXER_PAD_MAX (SNDRV_PCM_STREAM_LAST + 2)
struct media_mixer_ctl {
struct media_device *media_dev;
struct media_entity media_entity;
struct media_intf_devnode *intf_devnode;
struct media_link *intf_link;
struct media_pad media_pad[MEDIA_MIXER_PAD_MAX];
struct media_pipeline media_pipe;
};
int snd_media_device_create(struct snd_usb_audio *chip,
struct usb_interface *iface);
void snd_media_device_delete(struct snd_usb_audio *chip);
int snd_media_stream_init(struct snd_usb_substream *subs, struct snd_pcm *pcm,
int stream);
void snd_media_stream_delete(struct snd_usb_substream *subs);
int snd_media_start_pipeline(struct snd_usb_substream *subs);
void snd_media_stop_pipeline(struct snd_usb_substream *subs);
#else
static inline int snd_media_device_create(struct snd_usb_audio *chip,
struct usb_interface *iface)
{ return 0; }
static inline void snd_media_device_delete(struct snd_usb_audio *chip) { }
static inline int snd_media_stream_init(struct snd_usb_substream *subs,
struct snd_pcm *pcm, int stream)
{ return 0; }
static inline void snd_media_stream_delete(struct snd_usb_substream *subs) { }
static inline int snd_media_start_pipeline(struct snd_usb_substream *subs)
{ return 0; }
static inline void snd_media_stop_pipeline(struct snd_usb_substream *subs) { }
#endif
#endif /* __MEDIA_H */
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