Re: [PATCH v3 22/22] sound/usb: Use Media Controller API to share media resources

Shuah Khan
2016-02-26T19:34:04Z

On 02/11/2016 04:41 PM, Shuah Khan wrote:
> 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>

Hi Takashi,

Hope you are okay with this version. I addressed all
your comments. Could you please Ack it or let me know
if there is something I still need to address.

thanks,
-- Shuah

> ---
> sound/usb/Kconfig | 4 +
> sound/usb/Makefile | 2 +
> sound/usb/card.c | 14 +++
> sound/usb/card.h | 3 +
> sound/usb/media.c | 318 +++++++++++++++++++++++++++++++++++++++++++++++
> sound/usb/media.h | 72 +++++++++++
> sound/usb/mixer.h | 3 +
> sound/usb/pcm.c | 28 ++++-
> sound/usb/quirks-table.h | 1 +
> sound/usb/stream.c | 2 +
> sound/usb/usbaudio.h | 6 +
> 11 files changed, 448 insertions(+), 5 deletions(-)
> create mode 100644 sound/usb/media.c
> create mode 100644 sound/usb/media.h
>
> diff --git a/sound/usb/Kconfig b/sound/usb/Kconfig
> index a452ad7..ba117f5 100644
> --- a/sound/usb/Kconfig
> +++ b/sound/usb/Kconfig
> @@ -15,6 +15,7 @@ config SND_USB_AUDIO
> select SND_RAWMIDI
> select SND_PCM
> select BITREVERSE
> + select SND_USB_AUDIO_USE_MEDIA_CONTROLLER if MEDIA_CONTROLLER && MEDIA_SUPPORT
> help
> Say Y here to include support for USB audio and USB MIDI
> devices.
> @@ -22,6 +23,9 @@ config SND_USB_AUDIO
> To compile this driver as a module, choose M here: the module
> will be called snd-usb-audio.
>
> +config SND_USB_AUDIO_USE_MEDIA_CONTROLLER
> + bool
> +
> config SND_USB_UA101
> tristate "Edirol UA-101/UA-1000 driver"
> select SND_PCM
> diff --git a/sound/usb/Makefile b/sound/usb/Makefile
> index 2d2d122..8dca3c4 100644
> --- a/sound/usb/Makefile
> +++ b/sound/usb/Makefile
> @@ -15,6 +15,8 @@ snd-usb-audio-objs := card.o \
> quirks.o \
> stream.o
>
> +snd-usb-audio-$(CONFIG_SND_USB_AUDIO_USE_MEDIA_CONTROLLER) += media.o
> +
> snd-usbmidi-lib-objs := midi.o
>
> # Toplevel Module Dependency
> diff --git a/sound/usb/card.c b/sound/usb/card.c
> index 1f09d95..35fe256 100644
> --- a/sound/usb/card.c
> +++ b/sound/usb/card.c
> @@ -66,6 +66,7 @@
> #include "format.h"
> #include "power.h"
> #include "stream.h"
> +#include "media.h"
>
> MODULE_AUTHOR("Takashi Iwai <tiwai@suse.de>");
> MODULE_DESCRIPTION("USB Audio");
> @@ -561,6 +562,11 @@ static int usb_audio_probe(struct usb_interface *intf,
> if (err < 0)
> goto __error;
>
> + if (quirk->media_device) {
> + /* don't want to fail when media_device_create() fails */
> + media_device_create(chip, intf);
> + }
> +
> usb_chip[chip->index] = chip;
> chip->num_interfaces++;
> usb_set_intfdata(intf, chip);
> @@ -617,6 +623,14 @@ static void usb_audio_disconnect(struct usb_interface *intf)
> list_for_each(p, &chip->midi_list) {
> snd_usbmidi_disconnect(p);
> }
> + /*
> + * Nice to check quirk && quirk->media_device
> + * need some special handlings. Doesn't look like
> + * we have access to quirk here
> + * Acceses mixer_list
> + */
> + media_device_delete(chip);
> +
> /* release mixer resources */
> list_for_each_entry(mixer, &chip->mixer_list, list) {
> snd_usb_mixer_disconnect(mixer);
> diff --git a/sound/usb/card.h b/sound/usb/card.h
> index 71778ca..34a0898 100644
> --- a/sound/usb/card.h
> +++ b/sound/usb/card.h
> @@ -105,6 +105,8 @@ struct snd_usb_endpoint {
> struct list_head list;
> };
>
> +struct media_ctl;
> +
> struct snd_usb_substream {
> struct snd_usb_stream *stream;
> struct usb_device *dev;
> @@ -156,6 +158,7 @@ struct snd_usb_substream {
> } dsd_dop;
>
> bool trigger_tstamp_pending_update; /* trigger timestamp being updated from initial estimate */
> + struct media_ctl *media_ctl;
> };
>
> struct snd_usb_stream {
> diff --git a/sound/usb/media.c b/sound/usb/media.c
> new file mode 100644
> index 0000000..cff1459
> --- /dev/null
> +++ b/sound/usb/media.c
> @@ -0,0 +1,318 @@
> +/*
> + * media.c - 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.
> +*/
> +
> +#include <linux/init.h>
> +#include <linux/list.h>
> +#include <linux/mutex.h>
> +#include <linux/slab.h>
> +#include <linux/usb.h>
> +
> +#include <sound/pcm.h>
> +#include <sound/core.h>
> +
> +#include "usbaudio.h"
> +#include "card.h"
> +#include "mixer.h"
> +#include "media.h"
> +
> +static int media_enable_source(struct media_ctl *mctl)
> +{
> + if (mctl && mctl->media_dev->enable_source)
> + return mctl->media_dev->enable_source(&mctl->media_entity,
> + &mctl->media_pipe);
> + return 0;
> +}
> +
> +static void media_disable_source(struct media_ctl *mctl)
> +{
> + if (mctl && mctl->media_dev->disable_source)
> + mctl->media_dev->disable_source(&mctl->media_entity);
> +}
> +
> +int media_stream_init(struct snd_usb_substream *subs, struct snd_pcm *pcm,
> + int stream)
> +{
> + struct media_device *mdev;
> + struct media_ctl *mctl;
> + struct device *pcm_dev = &pcm->streams[stream].dev;
> + u32 intf_type;
> + int ret = 0;
> + u16 mixer_pad;
> + struct media_entity *entity;
> +
> + mdev = subs->stream->chip->media_dev;
> + if (!mdev)
> + return -ENODEV;
> +
> + if (subs->media_ctl)
> + return 0;
> +
> + /* allocate media_ctl */
> + mctl = kzalloc(sizeof(*mctl), GFP_KERNEL);
> + if (!mctl)
> + return -ENOMEM;
> +
> + mctl->media_dev = mdev;
> + if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
> + intf_type = MEDIA_INTF_T_ALSA_PCM_PLAYBACK;
> + mctl->media_entity.function = MEDIA_ENT_F_AUDIO_PLAYBACK;
> + mctl->media_pad.flags = MEDIA_PAD_FL_SOURCE;
> + mixer_pad = 1;
> + } else {
> + intf_type = MEDIA_INTF_T_ALSA_PCM_CAPTURE;
> + mctl->media_entity.function = MEDIA_ENT_F_AUDIO_CAPTURE;
> + mctl->media_pad.flags = MEDIA_PAD_FL_SINK;
> + mixer_pad = 2;
> + }
> + mctl->media_entity.name = pcm->name;
> + media_entity_pads_init(&mctl->media_entity, 1, &mctl->media_pad);
> + ret = media_device_register_entity(mctl->media_dev,
> + &mctl->media_entity);
> + if (ret)
> + goto err1;
> +
> + mctl->intf_devnode = media_devnode_create(mdev, intf_type, 0,
> + MAJOR(pcm_dev->devt),
> + MINOR(pcm_dev->devt));
> + if (!mctl->intf_devnode) {
> + ret = -ENOMEM;
> + goto err2;
> + }
> + mctl->intf_link = media_create_intf_link(&mctl->media_entity,
> + &mctl->intf_devnode->intf,
> + MEDIA_LNK_FL_ENABLED);
> + if (!mctl->intf_link) {
> + ret = -ENOMEM;
> + goto err3;
> + }
> +
> + /* create link between mixer and audio */
> + media_device_for_each_entity(entity, mdev) {
> + switch (entity->function) {
> + case MEDIA_ENT_F_AUDIO_MIXER:
> + ret = media_create_pad_link(entity, mixer_pad,
> + &mctl->media_entity, 0,
> + MEDIA_LNK_FL_ENABLED);
> + if (ret)
> + goto err4;
> + break;
> + }
> + }
> +
> + subs->media_ctl = mctl;
> + return 0;
> +
> +err4:
> + media_remove_intf_link(mctl->intf_link);
> +err3:
> + media_devnode_remove(mctl->intf_devnode);
> +err2:
> + media_device_unregister_entity(&mctl->media_entity);
> +err1:
> + kfree(mctl);
> + return ret;
> +}
> +
> +void media_stream_delete(struct snd_usb_substream *subs)
> +{
> + struct media_ctl *mctl = subs->media_ctl;
> +
> + if (mctl && mctl->media_dev) {
> + struct media_device *mdev;
> +
> + mdev = subs->stream->chip->media_dev;
> + if (mdev && media_devnode_is_registered(&mdev->devnode)) {
> + media_devnode_remove(mctl->intf_devnode);
> + media_device_unregister_entity(&mctl->media_entity);
> + media_entity_cleanup(&mctl->media_entity);
> + }
> + kfree(mctl);
> + subs->media_ctl = NULL;
> + }
> +}
> +
> +int media_start_pipeline(struct snd_usb_substream *subs)
> +{
> + struct media_ctl *mctl = subs->media_ctl;
> +
> + if (mctl)
> + return media_enable_source(mctl);
> + return 0;
> +}
> +
> +void media_stop_pipeline(struct snd_usb_substream *subs)
> +{
> + struct media_ctl *mctl = subs->media_ctl;
> +
> + if (mctl)
> + media_disable_source(mctl);
> +}
> +
> +int media_mixer_init(struct snd_usb_audio *chip)
> +{
> + struct device *ctl_dev = &chip->card->ctl_dev;
> + struct media_intf_devnode *ctl_intf;
> + struct usb_mixer_interface *mixer;
> + struct media_device *mdev = chip->media_dev;
> + struct media_mixer_ctl *mctl;
> + u32 intf_type = MEDIA_INTF_T_ALSA_CONTROL;
> + int ret;
> +
> + if (!mdev)
> + return -ENODEV;
> +
> + ctl_intf = chip->ctl_intf_media_devnode;
> + if (!ctl_intf) {
> + ctl_intf = media_devnode_create(mdev, intf_type, 0,
> + MAJOR(ctl_dev->devt),
> + MINOR(ctl_dev->devt));
> + if (!ctl_intf)
> + return -ENOMEM;
> + chip->ctl_intf_media_devnode = ctl_intf;
> + }
> +
> + list_for_each_entry(mixer, &chip->mixer_list, list) {
> +
> + if (mixer->media_mixer_ctl)
> + continue;
> +
> + /* allocate media_mixer_ctl */
> + mctl = kzalloc(sizeof(*mctl), GFP_KERNEL);
> + if (!mctl)
> + return -ENOMEM;
> +
> + mctl->media_dev = mdev;
> + mctl->media_entity.function = MEDIA_ENT_F_AUDIO_MIXER;
> + mctl->media_entity.name = chip->card->mixername;
> + mctl->media_pad[0].flags = MEDIA_PAD_FL_SINK;
> + mctl->media_pad[1].flags = MEDIA_PAD_FL_SOURCE;
> + mctl->media_pad[2].flags = MEDIA_PAD_FL_SOURCE;
> + media_entity_pads_init(&mctl->media_entity, MEDIA_MIXER_PAD_MAX,
> + mctl->media_pad);
> + ret = media_device_register_entity(mctl->media_dev,
> + &mctl->media_entity);
> + if (ret) {
> + kfree(mctl);
> + return ret;
> + }
> +
> + mctl->intf_link = media_create_intf_link(&mctl->media_entity,
> + &ctl_intf->intf,
> + MEDIA_LNK_FL_ENABLED);
> + if (!mctl->intf_link) {
> + media_device_unregister_entity(&mctl->media_entity);
> + media_entity_cleanup(&mctl->media_entity);
> + kfree(mctl);
> + return -ENOMEM;
> + }
> + mctl->intf_devnode = ctl_intf;
> + mixer->media_mixer_ctl = mctl;
> + }
> + return 0;
> +}
> +
> +static void media_mixer_delete(struct snd_usb_audio *chip)
> +{
> + struct usb_mixer_interface *mixer;
> + struct media_device *mdev = chip->media_dev;
> +
> + if (!mdev)
> + return;
> +
> + list_for_each_entry(mixer, &chip->mixer_list, list) {
> + struct media_mixer_ctl *mctl;
> +
> + mctl = mixer->media_mixer_ctl;
> + if (!mixer->media_mixer_ctl)
> + continue;
> +
> + if (media_devnode_is_registered(&mdev->devnode)) {
> + media_device_unregister_entity(&mctl->media_entity);
> + media_entity_cleanup(&mctl->media_entity);
> + }
> + kfree(mctl);
> + mixer->media_mixer_ctl = NULL;
> + }
> + if (media_devnode_is_registered(&mdev->devnode))
> + media_devnode_remove(chip->ctl_intf_media_devnode);
> + chip->ctl_intf_media_devnode = NULL;
> +}
> +
> +int media_device_create(struct snd_usb_audio *chip,
> + struct usb_interface *iface)
> +{
> + struct media_device *mdev;
> + struct usb_device *usbdev = interface_to_usbdev(iface);
> + int ret;
> +
> + mdev = media_device_get_devres(&usbdev->dev);
> + if (!mdev)
> + return -ENOMEM;
> + if (!mdev->dev) {
> + /* register media device */
> + mdev->dev = &usbdev->dev;
> + if (usbdev->product)
> + strlcpy(mdev->model, usbdev->product,
> + sizeof(mdev->model));
> + if (usbdev->serial)
> + strlcpy(mdev->serial, usbdev->serial,
> + sizeof(mdev->serial));
> + strcpy(mdev->bus_info, usbdev->devpath);
> + mdev->hw_revision = le16_to_cpu(usbdev->descriptor.bcdDevice);
> + media_device_init(mdev);
> + }
> + if (!media_devnode_is_registered(&mdev->devnode)) {
> + ret = media_device_register(mdev);
> + if (ret) {
> + dev_err(&usbdev->dev,
> + "Couldn't register media device. Error: %d\n",
> + ret);
> + return ret;
> + }
> + }
> +
> + /* save media device - avoid lookups */
> + chip->media_dev = mdev;
> +
> + /* Create media entities for mixer and control dev */
> + ret = media_mixer_init(chip);
> + if (ret) {
> + dev_err(&usbdev->dev,
> + "Couldn't create media mixer entities. Error: %d\n",
> + ret);
> +
> + /* clear saved media_dev */
> + chip->media_dev = NULL;
> +
> + return ret;
> + }
> + return 0;
> +}
> +
> +void media_device_delete(struct snd_usb_audio *chip)
> +{
> + struct media_device *mdev = chip->media_dev;
> +
> + media_mixer_delete(chip);
> +
> + if (mdev) {
> + if (media_devnode_is_registered(&mdev->devnode))
> + media_device_unregister(mdev);
> + chip->media_dev = NULL;
> + }
> +}
> diff --git a/sound/usb/media.h b/sound/usb/media.h
> new file mode 100644
> index 0000000..f66b4d7
> --- /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_device_create(struct snd_usb_audio *chip,
> + struct usb_interface *iface);
> +void media_device_delete(struct snd_usb_audio *chip);
> +int media_stream_init(struct snd_usb_substream *subs, struct snd_pcm *pcm,
> + int stream);
> +void media_stream_delete(struct snd_usb_substream *subs);
> +int media_start_pipeline(struct snd_usb_substream *subs);
> +void media_stop_pipeline(struct snd_usb_substream *subs);
> +#else
> +static inline int media_device_create(struct snd_usb_audio *chip,
> + struct usb_interface *iface)
> + { return 0; }
> +static inline void media_device_delete(struct snd_usb_audio *chip) { }
> +static inline int media_stream_init(struct snd_usb_substream *subs,
> + struct snd_pcm *pcm, int stream)
> + { return 0; }
> +static inline void media_stream_delete(struct snd_usb_substream *subs) { }
> +static inline int media_start_pipeline(struct snd_usb_substream *subs)
> + { return 0; }
> +static inline void media_stop_pipeline(struct snd_usb_substream *subs) { }
> +#endif
> +#endif /* __MEDIA_H */
> diff --git a/sound/usb/mixer.h b/sound/usb/mixer.h
> index 3417ef3..f378944 100644
> --- a/sound/usb/mixer.h
> +++ b/sound/usb/mixer.h
> @@ -3,6 +3,8 @@
>
> #include <sound/info.h>
>
> +struct media_mixer_ctl;
> +
> struct usb_mixer_interface {
> struct snd_usb_audio *chip;
> struct usb_host_interface *hostif;
> @@ -22,6 +24,7 @@ struct usb_mixer_interface {
> struct urb *rc_urb;
> struct usb_ctrlrequest *rc_setup_packet;
> u8 rc_buffer[6];
> + struct media_mixer_ctl *media_mixer_ctl;
> };
>
> #define MAX_CHANNELS 16 /* max logical channels */
> diff --git a/sound/usb/pcm.c b/sound/usb/pcm.c
> index 9245f52..c3b8486 100644
> --- a/sound/usb/pcm.c
> +++ b/sound/usb/pcm.c
> @@ -35,6 +35,7 @@
> #include "pcm.h"
> #include "clock.h"
> #include "power.h"
> +#include "media.h"
>
> #define SUBSTREAM_FLAG_DATA_EP_STARTED 0
> #define SUBSTREAM_FLAG_SYNC_EP_STARTED 1
> @@ -715,10 +716,14 @@ static int snd_usb_hw_params(struct snd_pcm_substream *substream,
> struct audioformat *fmt;
> int ret;
>
> + ret = media_start_pipeline(subs);
> + if (ret)
> + return ret;
> +
> ret = snd_pcm_lib_alloc_vmalloc_buffer(substream,
> params_buffer_bytes(hw_params));
> if (ret < 0)
> - return ret;
> + goto err_ret;
>
> subs->pcm_format = params_format(hw_params);
> subs->period_bytes = params_period_bytes(hw_params);
> @@ -732,22 +737,27 @@ static int snd_usb_hw_params(struct snd_pcm_substream *substream,
> dev_dbg(&subs->dev->dev,
> "cannot set format: format = %#x, rate = %d, channels = %d\n",
> subs->pcm_format, subs->cur_rate, subs->channels);
> - return -EINVAL;
> + ret = -EINVAL;
> + goto err_ret;
> }
>
> ret = snd_usb_lock_shutdown(subs->stream->chip);
> if (ret < 0)
> - return ret;
> + goto err_ret;
> ret = set_format(subs, fmt);
> snd_usb_unlock_shutdown(subs->stream->chip);
> if (ret < 0)
> - return ret;
> + goto err_ret;
>
> subs->interface = fmt->iface;
> subs->altset_idx = fmt->altset_idx;
> subs->need_setup_ep = true;
>
> return 0;
> +
> +err_ret:
> + media_stop_pipeline(subs);
> + return ret;
> }
>
> /*
> @@ -759,6 +769,7 @@ static int snd_usb_hw_free(struct snd_pcm_substream *substream)
> {
> struct snd_usb_substream *subs = substream->runtime->private_data;
>
> + media_stop_pipeline(subs);
> subs->cur_audiofmt = NULL;
> subs->cur_rate = 0;
> subs->period_bytes = 0;
> @@ -1219,6 +1230,7 @@ static int snd_usb_pcm_open(struct snd_pcm_substream *substream, int direction)
> struct snd_usb_stream *as = snd_pcm_substream_chip(substream);
> struct snd_pcm_runtime *runtime = substream->runtime;
> struct snd_usb_substream *subs = &as->substream[direction];
> + int ret;
>
> subs->interface = -1;
> subs->altset_idx = 0;
> @@ -1232,7 +1244,12 @@ static int snd_usb_pcm_open(struct snd_pcm_substream *substream, int direction)
> subs->dsd_dop.channel = 0;
> subs->dsd_dop.marker = 1;
>
> - return setup_hw_info(runtime, subs);
> + ret = setup_hw_info(runtime, subs);
> + if (ret == 0)
> + ret = media_stream_init(subs, as->pcm, direction);
> + if (ret)
> + snd_usb_autosuspend(subs->stream->chip);
> + return ret;
> }
>
> static int snd_usb_pcm_close(struct snd_pcm_substream *substream, int direction)
> @@ -1241,6 +1258,7 @@ static int snd_usb_pcm_close(struct snd_pcm_substream *substream, int direction)
> struct snd_usb_substream *subs = &as->substream[direction];
>
> stop_endpoints(subs, true);
> + media_stop_pipeline(subs);
>
> if (subs->interface >= 0 &&
> !snd_usb_lock_shutdown(subs->stream->chip)) {
> diff --git a/sound/usb/quirks-table.h b/sound/usb/quirks-table.h
> index c60a776..9d087b1 100644
> --- a/sound/usb/quirks-table.h
> +++ b/sound/usb/quirks-table.h
> @@ -2886,6 +2886,7 @@ YAMAHA_DEVICE(0x7010, "UB99"),
> .product_name = pname, \
> .ifnum = QUIRK_ANY_INTERFACE, \
> .type = QUIRK_AUDIO_ALIGN_TRANSFER, \
> + .media_device = 1, \
> } \
> }
>
> diff --git a/sound/usb/stream.c b/sound/usb/stream.c
> index c4dc577..6c7f5c1 100644
> --- a/sound/usb/stream.c
> +++ b/sound/usb/stream.c
> @@ -36,6 +36,7 @@
> #include "format.h"
> #include "clock.h"
> #include "stream.h"
> +#include "media.h"
>
> /*
> * free a substream
> @@ -52,6 +53,7 @@ static void free_substream(struct snd_usb_substream *subs)
> kfree(fp);
> }
> kfree(subs->rate_list.list);
> + media_stream_delete(subs);
> }
>
>
> diff --git a/sound/usb/usbaudio.h b/sound/usb/usbaudio.h
> index b665d85..a161c7c 100644
> --- a/sound/usb/usbaudio.h
> +++ b/sound/usb/usbaudio.h
> @@ -30,6 +30,9 @@
> *
> */
>
> +struct media_device;
> +struct media_intf_devnode;
> +
> struct snd_usb_audio {
> int index;
> struct usb_device *dev;
> @@ -60,6 +63,8 @@ struct snd_usb_audio {
> bool autoclock; /* from the 'autoclock' module param */
>
> struct usb_host_interface *ctrl_intf; /* the audio control interface */
> + struct media_device *media_dev;
> + struct media_intf_devnode *ctl_intf_media_devnode;
> };
>
> #define usb_audio_err(chip, fmt, args...) \
> @@ -110,6 +115,7 @@ struct snd_usb_audio_quirk {
> const char *product_name;
> int16_t ifnum;
> uint16_t type;
> + bool media_device;
> const void *data;
> };
>
>

--
Shuah Khan
Sr. Linux Kernel Developer
Open Source Innovation Group
Samsung Research America (Silicon Valley)
shuahkh@osg.samsung.com | (970) 217-8978