[alsa-devel] [PATCH v2 27/31] sound/usb: Create media mixer function and control interface entities
Shuah Khan
shuahkh at osg.samsung.com
Thu Jan 14 20:52:29 CET 2016
Add support for creating MEDIA_ENT_F_AUDIO_MIXER entity for
each mixer and a MEDIA_INTF_T_ALSA_CONTROL control interface
entity that links to mixer entities. MEDIA_INTF_T_ALSA_CONTROL
entity corresponds to the control device for the card.
Signed-off-by: Shuah Khan <shuahkh at osg.samsung.com>
---
Changes since v1:
- Rebase after patch 26 v2 work.
- Fixed warnings in stub defines when
CONFIG_SND_USB_AUDIO_USE_MEDIA_CONTROLLER
is disabled
sound/usb/card.c | 5 +++
sound/usb/media.c | 91 ++++++++++++++++++++++++++++++++++++++++++++++++++++
sound/usb/media.h | 21 ++++++++++++
sound/usb/mixer.h | 1 +
sound/usb/usbaudio.h | 1 +
5 files changed, 119 insertions(+)
diff --git a/sound/usb/card.c b/sound/usb/card.c
index 1a63851..e965982 100644
--- a/sound/usb/card.c
+++ b/sound/usb/card.c
@@ -562,6 +562,9 @@ static int usb_audio_probe(struct usb_interface *intf,
if (err < 0)
goto __error;
+ /* Create media entities for mixer and control dev */
+ media_mixer_init(chip);
+
usb_chip[chip->index] = chip;
chip->num_interfaces++;
usb_set_intfdata(intf, chip);
@@ -618,6 +621,8 @@ static void usb_audio_disconnect(struct usb_interface *intf)
list_for_each(p, &chip->midi_list) {
snd_usbmidi_disconnect(p);
}
+ /* delete mixer media resources */
+ media_mixer_delete(chip);
/* release mixer resources */
list_for_each_entry(mixer, &chip->mixer_list, list) {
snd_usb_mixer_disconnect(mixer);
diff --git a/sound/usb/media.c b/sound/usb/media.c
index 644b6e8..da58378 100644
--- a/sound/usb/media.c
+++ b/sound/usb/media.c
@@ -23,9 +23,11 @@
#include <linux/usb.h>
#include <sound/pcm.h>
+#include <sound/core.h>
#include "usbaudio.h"
#include "card.h"
+#include "mixer.h"
#include "media.h"
int media_device_create(struct snd_usb_audio *chip,
@@ -188,3 +190,92 @@ void media_stop_pipeline(struct snd_usb_substream *subs)
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;
+ struct media_mixer_ctl *mctl;
+ u32 intf_type = MEDIA_INTF_T_ALSA_CONTROL;
+ int ret;
+
+ mdev = media_device_find_devres(&chip->dev->dev);
+ if (!mdev)
+ return -ENODEV;
+
+ ctl_intf = chip->ctl_intf_media_devnode;
+ if (!ctl_intf) {
+ ctl_intf = (void *) 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 = (void *) mctl;
+ }
+ return 0;
+}
+
+void media_mixer_delete(struct snd_usb_audio *chip)
+{
+ struct usb_mixer_interface *mixer;
+ struct media_device *mdev;
+
+ mdev = media_device_find_devres(&chip->dev->dev);
+ if (!mdev)
+ return;
+
+ list_for_each_entry(mixer, &chip->mixer_list, list) {
+ struct media_mixer_ctl *mctl;
+
+ mctl = (struct media_mixer_ctl *) mixer->media_mixer_ctl;
+ if (!mixer->media_mixer_ctl)
+ continue;
+
+ media_device_unregister_entity(&mctl->media_entity);
+ media_entity_cleanup(&mctl->media_entity);
+ kfree(mctl);
+ mixer->media_mixer_ctl = NULL;
+ }
+ media_devnode_remove(chip->ctl_intf_media_devnode);
+}
diff --git a/sound/usb/media.h b/sound/usb/media.h
index 00b77e6..9477ffa 100644
--- a/sound/usb/media.h
+++ b/sound/usb/media.h
@@ -22,6 +22,7 @@
#include <media/media-device.h>
#include <media/media-entity.h>
+#include <sound/asound.h>
struct media_ctl {
struct media_device *media_dev;
@@ -32,6 +33,22 @@ struct media_ctl {
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 usb_interface *iface);
@@ -40,6 +57,8 @@ int media_stream_init(struct snd_usb_substream *subs, struct snd_pcm *pcm,
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);
+int media_mixer_init(struct snd_usb_audio *chip);
+void media_mixer_delete(struct snd_usb_audio *chip);
#else
static inline int media_device_create(struct snd_usb_audio *chip,
struct usb_interface *iface)
@@ -52,5 +71,7 @@ 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) { }
+static inline int media_mixer_init(struct snd_usb_audio *chip) { return 0; }
+static inline void media_mixer_delete(struct snd_usb_audio *chip) { }
#endif
#endif /* __MEDIA_H */
diff --git a/sound/usb/mixer.h b/sound/usb/mixer.h
index 3417ef3..787b352 100644
--- a/sound/usb/mixer.h
+++ b/sound/usb/mixer.h
@@ -22,6 +22,7 @@ struct usb_mixer_interface {
struct urb *rc_urb;
struct usb_ctrlrequest *rc_setup_packet;
u8 rc_buffer[6];
+ void *media_mixer_ctl;
};
#define MAX_CHANNELS 16 /* max logical channels */
diff --git a/sound/usb/usbaudio.h b/sound/usb/usbaudio.h
index e3fac29..490b16a 100644
--- a/sound/usb/usbaudio.h
+++ b/sound/usb/usbaudio.h
@@ -60,6 +60,7 @@ struct snd_usb_audio {
bool autoclock; /* from the 'autoclock' module param */
struct usb_host_interface *ctrl_intf; /* the audio control interface */
+ void *ctl_intf_media_devnode;
};
#define usb_audio_err(chip, fmt, args...) \
--
2.5.0
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