On 10/22/2015 01:16 AM, Takashi Iwai wrote:
On Wed, 21 Oct 2015 01:25:15 +0200,
Shuah Khan wrote:
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@xxxxxxxxxxxxxxx>
---
sound/usb/card.c | 5 +++
sound/usb/media.c | 89 ++++++++++++++++++++++++++++++++++++++++++++++++++++
sound/usb/media.h | 20 ++++++++++++
sound/usb/mixer.h | 1 +
sound/usb/usbaudio.h | 1 +
5 files changed, 116 insertions(+)
diff --git a/sound/usb/card.c b/sound/usb/card.c
index 469d2bf..d004cb4 100644
--- a/sound/usb/card.c
+++ b/sound/usb/card.c
@@ -560,6 +560,9 @@ 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++;
chip->probing = 0;
@@ -616,6 +619,8 @@ 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 0cbfee6..a26ea8b 100644
--- a/sound/usb/media.c
+++ b/sound/usb/media.c
@@ -199,4 +199,93 @@ 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 = (struct media_intf_devnode *) chip->ctl_intf_media_devnode;
Why do we need cast? Can't chip->ctl_intf_media_devnode itself be
struct media_intf_devndoe pointer?
Yeah. There is no need to cast here. I will fix it.
+ 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;
+ }
Is chip->ctl_intf_media_devnode assigned anywhere at all?
Thanks. Great find. I missed that one. It should be assigned
as above in media_devnode_create() success path.
Not directly related with this patchset: the above uses
media_devnode_create(), which I assume it's a device-file
(major:minor) specific. What if sound hardware with multiple codecs
and so on in general?
Yes. It is for the control device. I looked at the multiple
codecs case briefly, but it requires more thought. Maybe
something I could bring up at the Media Workshop today if
time permits.
+
+ list_for_each_entry(mixer, &chip->mixer_list, list) {
+
+ if (mixer->media_mixer_ctl)
+ continue;
+
+ /* allocate media_ctl */
+ mctl = kzalloc(sizeof(struct media_ctl), GFP_KERNEL);
+ if (!mctl)
+ return -ENOMEM;
+
+ mixer->media_mixer_ctl = (void *) mctl;
+ 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_init(&mctl->media_entity, MEDIA_MIXER_PAD_MAX,
+ mctl->media_pad);
+ ret = media_device_register_entity(mctl->media_dev,
+ &mctl->media_entity);
+ if (ret)
+ return ret;
Will the last (unfinished) mctl be freed properly in the error path?
Should be I will make sure.
+ 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);
+ return -ENOMEM;
Ditto.
+ }
+ mctl->intf_devnode = ctl_intf;
+ }
+ 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_entity_remove_links(&mctl->media_entity);
+ media_device_unregister_entity(&mctl->media_entity);
+ media_entity_cleanup(&mctl->media_entity);
+ mctl->media_dev = NULL;
+ mctl->intf_devnode = NULL;
+ kfree(mctl);
The previous two NULL are superfluous as we'll free them immediately.
Yes. I will fix that.
Thanks for the review
-- Shuah
thanks,
Takashi
+ mixer->media_mixer_ctl = NULL;
+ }
+ media_devnode_remove(chip->ctl_intf_media_devnode);
+}
+
#endif
diff --git a/sound/usb/media.h b/sound/usb/media.h
index cdcfb80..8268e52 100644
--- a/sound/usb/media.h
+++ b/sound/usb/media.h
@@ -20,6 +20,7 @@
#ifdef 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;
@@ -30,6 +31,21 @@ 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_init(struct snd_usb_audio *chip, struct usb_interface *iface);
void media_device_delete(struct usb_interface *iface);
int media_stream_init(struct snd_usb_substream *subs, struct snd_pcm *pcm,
@@ -37,6 +53,8 @@ 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_init(struct snd_usb_audio *chip,
struct usb_interface *iface)
@@ -49,5 +67,7 @@ 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 int media_mixer_init(struct snd_usb_audio *chip) { return 0; }
+static 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 d3268f0..9d62a9e 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 c2dbf1d..b2be7c3 100644
--- a/sound/usb/usbaudio.h
+++ b/sound/usb/usbaudio.h
@@ -59,6 +59,7 @@ 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...) \
--
2.1.4
--
Shuah Khan
Sr. Linux Kernel Developer
Samsung Research America (Silicon Valley)
shuahkh@xxxxxxxxxxxxxxx | (970) 217-8978
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