sound/usb/media.h

   1 /*
   2  * media.h - Media Controller specific ALSA driver code
   3  *
   4  * Copyright (c) 2016 Shuah Khan <shuahkh@osg.samsung.com>
   5  * Copyright (c) 2016 Samsung Electronics Co., Ltd.
   6  *
   7  * This file is released under the GPLv2.
   8  */
   9
  10 /*
  11  * This file adds Media Controller support to ALSA driver
  12  * to use the Media Controller API to share tuner with DVB
  13  * and V4L2 drivers that control media device. Media device
  14  * is created based on existing quirks framework. Using this
  15  * 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 <media/media-device.h>
  23 #include <media/media-entity.h>
  24 #include <sound/asound.h>
  25
  26 struct media_ctl {
  27         struct media_device *media_dev;
  28         struct media_entity media_entity;
  29         struct media_intf_devnode *intf_devnode;
  30         struct media_link *intf_link;
  31         struct media_pad media_pad;
  32         struct media_pipeline media_pipe;
  33 };
  34
  35 /*
  36  * One source pad each for SNDRV_PCM_STREAM_CAPTURE and
  37  * SNDRV_PCM_STREAM_PLAYBACK. One for sink pad to link
  38  * to AUDIO Source
  39 */
  40 #define MEDIA_MIXER_PAD_MAX    (SNDRV_PCM_STREAM_LAST + 2)
  41
  42 struct media_mixer_ctl {
  43         struct media_device *media_dev;
  44         struct media_entity media_entity;
  45         struct media_intf_devnode *intf_devnode;
  46         struct media_link *intf_link;
  47         struct media_pad media_pad[MEDIA_MIXER_PAD_MAX];
  48         struct media_pipeline media_pipe;
  49 };
  50
  51 int media_snd_device_create(struct snd_usb_audio *chip,
  52                             struct usb_interface *iface);
  53 void media_snd_device_delete(struct snd_usb_audio *chip);
  54 int media_snd_stream_init(struct snd_usb_substream *subs, struct snd_pcm *pcm,
  55                           int stream);
  56 void media_snd_stream_delete(struct snd_usb_substream *subs);
  57 int media_snd_start_pipeline(struct snd_usb_substream *subs);
  58 void media_snd_stop_pipeline(struct snd_usb_substream *subs);
  59 #else
  60 static inline int media_snd_device_create(struct snd_usb_audio *chip,
  61                                           struct usb_interface *iface)
  62                                                 { return 0; }
  63 static inline void media_snd_device_delete(struct snd_usb_audio *chip) { }
  64 static inline int media_snd_stream_init(struct snd_usb_substream *subs,
  65                                         struct snd_pcm *pcm, int stream)
  66                                                 { return 0; }
  67 static inline void media_snd_stream_delete(struct snd_usb_substream *subs) { }
  68 static inline int media_snd_start_pipeline(struct snd_usb_substream *subs)
  69                                         { return 0; }
  70 static inline void media_snd_stop_pipeline(struct snd_usb_substream *subs) { }
  71 #endif
  72 #endif /* __MEDIA_H */