diff options
| author | Shuah Khan <shuahkh@osg.samsung.com> | 2016-03-02 19:50:31 +0300 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab@osg.samsung.com> | 2016-03-03 21:01:13 +0300 |
| commit | aebb2b89bff0fdeb4e7ddd73dcbccde1a0f27554 (patch) | |
| tree | aad7f1862beb01250032ac02d46d1dac11ccaa18 /sound/usb/media.h | |
| parent | 6ede20f9683c55dac8281b63d80b5cc669640252 (diff) | |
| download | linux-aebb2b89bff0fdeb4e7ddd73dcbccde1a0f27554.tar.xz | |
[media] sound/usb: Use Media Controller API to share media resources
Change ALSA driver to use Media Controller API to share media resources
with DVB and V4L2 drivers on a AU0828 media device. Media Controller
specific initialization is done after sound card is registered. ALSA
creates Media interface and entity function graph nodes for Control,
Mixer, PCM Playback, and PCM Capture devices.
snd_usb_hw_params() will call Media Controller enable source handler
interface to request the media resource. If resource request is
granted, it will release it from snd_usb_hw_free(). If resource is
busy, -EBUSY is returned.
Media specific cleanup is done in usb_audio_disconnect().
Signed-off-by: Shuah Khan <shuahkh@osg.samsung.com>
Acked-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
Diffstat (limited to 'sound/usb/media.h')
| -rw-r--r-- | sound/usb/media.h | 72 |
1 files changed, 72 insertions, 0 deletions
diff --git a/sound/usb/media.h b/sound/usb/media.h new file mode 100644 index 000000000000..1dcdcdc5f7aa --- /dev/null +++ b/sound/usb/media.h @@ -0,0 +1,72 @@ +/* + * media.h - Media Controller specific ALSA driver code + * + * Copyright (c) 2016 Shuah Khan <shuahkh@osg.samsung.com> + * Copyright (c) 2016 Samsung Electronics Co., Ltd. + * + * This file is released under the GPLv2. + */ + +/* + * This file adds Media Controller support to ALSA driver + * to use the Media Controller API to share tuner with DVB + * and V4L2 drivers that control media device. Media device + * is created based on 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 <media/media-device.h> +#include <media/media-entity.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 media_snd_device_create(struct snd_usb_audio *chip, + struct usb_interface *iface); +void media_snd_device_delete(struct snd_usb_audio *chip); +int media_snd_stream_init(struct snd_usb_substream *subs, struct snd_pcm *pcm, + int stream); +void media_snd_stream_delete(struct snd_usb_substream *subs); +int media_snd_start_pipeline(struct snd_usb_substream *subs); +void media_snd_stop_pipeline(struct snd_usb_substream *subs); +#else +static inline int media_snd_device_create(struct snd_usb_audio *chip, + struct usb_interface *iface) + { return 0; } +static inline void media_snd_device_delete(struct snd_usb_audio *chip) { } +static inline int media_snd_stream_init(struct snd_usb_substream *subs, + struct snd_pcm *pcm, int stream) + { return 0; } +static inline void media_snd_stream_delete(struct snd_usb_substream *subs) { } +static inline int media_snd_start_pipeline(struct snd_usb_substream *subs) + { return 0; } +static inline void media_snd_stop_pipeline(struct snd_usb_substream *subs) { } +#endif +#endif /* __MEDIA_H */ |