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[PATCH v2 14/22] media: au0828 change to use Managed Media Controller API

Started byShuah Khan <shuahkh@osg.samsung.com>
First post2016-02-04 05:10 +0100
Last post2016-02-04 11:10 +0100
Articles 3 — 2 participants

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  [PATCH v2 14/22] media: au0828 change to use Managed Media Controller API Shuah Khan <shuahkh@osg.samsung.com> - 2016-02-04 05:10 +0100
    Re: [PATCH v2 14/22] media: au0828 change to use Managed Media  Controller API Mauro Carvalho Chehab <mchehab@osg.samsung.com> - 2016-02-04 11:10 +0100
    Re: [PATCH v2 14/22] media: au0828 change to use Managed Media  Controller API Mauro Carvalho Chehab <mchehab@osg.samsung.com> - 2016-02-04 11:10 +0100

#1326388 — [PATCH v2 14/22] media: au0828 change to use Managed Media Controller API

FromShuah Khan <shuahkh@osg.samsung.com>
Date2016-02-04 05:10 +0100
Subject[PATCH v2 14/22] media: au0828 change to use Managed Media Controller API
Message-ID<qYjp1-3uR-37@gated-at.bofh.it>
Change au0828 to use Managed Media Controller API to
share media device and coordinate creating/deleting
the shared media device with the snd-usb-audio driver.
The shared media device is created as device resource
of the parent usb device of the two drivers.

Signed-off-by: Shuah Khan <shuahkh@osg.samsung.com>
---
 drivers/media/usb/au0828/au0828-core.c | 29 +++++++++++++++--------------
 1 file changed, 15 insertions(+), 14 deletions(-)

diff --git a/drivers/media/usb/au0828/au0828-core.c b/drivers/media/usb/au0828/au0828-core.c
index df2bc3f..b8c4bdd 100644
--- a/drivers/media/usb/au0828/au0828-core.c
+++ b/drivers/media/usb/au0828/au0828-core.c
@@ -134,10 +134,10 @@ static void au0828_unregister_media_device(struct au0828_dev *dev)
 {
 
 #ifdef CONFIG_MEDIA_CONTROLLER
-	if (dev->media_dev) {
+	if (dev->media_dev &&
+		media_devnode_is_registered(&dev->media_dev->devnode)) {
 		media_device_unregister(dev->media_dev);
 		media_device_cleanup(dev->media_dev);
-		kfree(dev->media_dev);
 		dev->media_dev = NULL;
 	}
 #endif
@@ -223,23 +223,24 @@ static int au0828_media_device_init(struct au0828_dev *dev,
 #ifdef CONFIG_MEDIA_CONTROLLER
 	struct media_device *mdev;
 
-	mdev = kzalloc(sizeof(*mdev), GFP_KERNEL);
+	mdev = media_device_get_devres(&udev->dev);
 	if (!mdev)
 		return -ENOMEM;
 
-	mdev->dev = &udev->dev;
+	if (!media_devnode_is_registered(&mdev->devnode)) {
+		mdev->dev = &udev->dev;
 
-	if (!dev->board.name)
-		strlcpy(mdev->model, "unknown au0828", sizeof(mdev->model));
-	else
-		strlcpy(mdev->model, dev->board.name, sizeof(mdev->model));
-	if (udev->serial)
-		strlcpy(mdev->serial, udev->serial, sizeof(mdev->serial));
-	strcpy(mdev->bus_info, udev->devpath);
-	mdev->hw_revision = le16_to_cpu(udev->descriptor.bcdDevice);
-	mdev->driver_version = LINUX_VERSION_CODE;
+		if (udev->product)
+			strlcpy(mdev->model, udev->product,
+				sizeof(mdev->model));
+		if (udev->serial)
+			strlcpy(mdev->serial, udev->serial,
+				sizeof(mdev->serial));
+		strcpy(mdev->bus_info, udev->devpath);
+		mdev->hw_revision = le16_to_cpu(udev->descriptor.bcdDevice);
 
-	media_device_init(mdev);
+		media_device_init(mdev);
+	}
 
 	dev->media_dev = mdev;
 #endif
-- 
2.5.0

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#1326552 — Re: [PATCH v2 14/22] media: au0828 change to use Managed Media Controller API

FromMauro Carvalho Chehab <mchehab@osg.samsung.com>
Date2016-02-04 11:10 +0100
SubjectRe: [PATCH v2 14/22] media: au0828 change to use Managed Media Controller API
Message-ID<qYp1p-7ay-31@gated-at.bofh.it>
In reply to#1326388
Em Thu, 4 Feb 2016 08:05:00 -0200
Mauro Carvalho Chehab <mchehab@osg.samsung.com> escreveu:

> Em Wed, 03 Feb 2016 21:03:46 -0700
> Shuah Khan <shuahkh@osg.samsung.com> escreveu:
> 
> > Change au0828 to use Managed Media Controller API to
> > share media device and coordinate creating/deleting
> > the shared media device with the snd-usb-audio driver.
> > The shared media device is created as device resource
> > of the parent usb device of the two drivers.
> > 
> > Signed-off-by: Shuah Khan <shuahkh@osg.samsung.com>
> > ---
> >  drivers/media/usb/au0828/au0828-core.c | 29 +++++++++++++++--------------
> >  1 file changed, 15 insertions(+), 14 deletions(-)
> > 
> > diff --git a/drivers/media/usb/au0828/au0828-core.c b/drivers/media/usb/au0828/au0828-core.c
> > index df2bc3f..b8c4bdd 100644
> > --- a/drivers/media/usb/au0828/au0828-core.c
> > +++ b/drivers/media/usb/au0828/au0828-core.c
> > @@ -134,10 +134,10 @@ static void au0828_unregister_media_device(struct au0828_dev *dev)
> >  {
> >  
> >  #ifdef CONFIG_MEDIA_CONTROLLER
> > -	if (dev->media_dev) {
> > +	if (dev->media_dev &&
> > +		media_devnode_is_registered(&dev->media_dev->devnode)) {
> >  		media_device_unregister(dev->media_dev);
> >  		media_device_cleanup(dev->media_dev);
> > -		kfree(dev->media_dev);
> >  		dev->media_dev = NULL;
> >  	}
> >  #endif
> > @@ -223,23 +223,24 @@ static int au0828_media_device_init(struct au0828_dev *dev,
> >  #ifdef CONFIG_MEDIA_CONTROLLER
> >  	struct media_device *mdev;
> >  
> > -	mdev = kzalloc(sizeof(*mdev), GFP_KERNEL);
> > +	mdev = media_device_get_devres(&udev->dev);
> >  	if (!mdev)
> >  		return -ENOMEM;
> >  
> > -	mdev->dev = &udev->dev;
> > +	if (!media_devnode_is_registered(&mdev->devnode)) {
> > +		mdev->dev = &udev->dev;
> >  
> > -	if (!dev->board.name)
> > -		strlcpy(mdev->model, "unknown au0828", sizeof(mdev->model));
> > -	else
> > -		strlcpy(mdev->model, dev->board.name, sizeof(mdev->model));
> > -	if (udev->serial)
> > -		strlcpy(mdev->serial, udev->serial, sizeof(mdev->serial));
> > -	strcpy(mdev->bus_info, udev->devpath);
> > -	mdev->hw_revision = le16_to_cpu(udev->descriptor.bcdDevice);
> > -	mdev->driver_version = LINUX_VERSION_CODE;
> > +		if (udev->product)
> > +			strlcpy(mdev->model, udev->product,
> > +				sizeof(mdev->model));
> 
> Why did you change that? On some boards, udev->product doesn't reflect
> the brand name, but have just some random generic data.
> 
> Also, as the other logs associated with the device uses dev->board.name,
> we want the media controller to use the same name here. Ok, if this
> is null, we could use udev->product as a replacement.

Ah, looking at patch 15/22, I understood why you wanted the above
change: if the device is registered first by ALSA, it won't have a
dev->board.name.

It looks OK to change from dev->board.name to udev->product then,
but please document the reason for it at the patch description.

Regards,
Mauro

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#1326554 — Re: [PATCH v2 14/22] media: au0828 change to use Managed Media Controller API

FromMauro Carvalho Chehab <mchehab@osg.samsung.com>
Date2016-02-04 11:10 +0100
SubjectRe: [PATCH v2 14/22] media: au0828 change to use Managed Media Controller API
Message-ID<qYp1p-7ay-33@gated-at.bofh.it>
In reply to#1326388
Em Wed, 03 Feb 2016 21:03:46 -0700
Shuah Khan <shuahkh@osg.samsung.com> escreveu:

> Change au0828 to use Managed Media Controller API to
> share media device and coordinate creating/deleting
> the shared media device with the snd-usb-audio driver.
> The shared media device is created as device resource
> of the parent usb device of the two drivers.
> 
> Signed-off-by: Shuah Khan <shuahkh@osg.samsung.com>
> ---
>  drivers/media/usb/au0828/au0828-core.c | 29 +++++++++++++++--------------
>  1 file changed, 15 insertions(+), 14 deletions(-)
> 
> diff --git a/drivers/media/usb/au0828/au0828-core.c b/drivers/media/usb/au0828/au0828-core.c
> index df2bc3f..b8c4bdd 100644
> --- a/drivers/media/usb/au0828/au0828-core.c
> +++ b/drivers/media/usb/au0828/au0828-core.c
> @@ -134,10 +134,10 @@ static void au0828_unregister_media_device(struct au0828_dev *dev)
>  {
>  
>  #ifdef CONFIG_MEDIA_CONTROLLER
> -	if (dev->media_dev) {
> +	if (dev->media_dev &&
> +		media_devnode_is_registered(&dev->media_dev->devnode)) {
>  		media_device_unregister(dev->media_dev);
>  		media_device_cleanup(dev->media_dev);
> -		kfree(dev->media_dev);
>  		dev->media_dev = NULL;
>  	}
>  #endif
> @@ -223,23 +223,24 @@ static int au0828_media_device_init(struct au0828_dev *dev,
>  #ifdef CONFIG_MEDIA_CONTROLLER
>  	struct media_device *mdev;
>  
> -	mdev = kzalloc(sizeof(*mdev), GFP_KERNEL);
> +	mdev = media_device_get_devres(&udev->dev);
>  	if (!mdev)
>  		return -ENOMEM;
>  
> -	mdev->dev = &udev->dev;
> +	if (!media_devnode_is_registered(&mdev->devnode)) {
> +		mdev->dev = &udev->dev;
>  
> -	if (!dev->board.name)
> -		strlcpy(mdev->model, "unknown au0828", sizeof(mdev->model));
> -	else
> -		strlcpy(mdev->model, dev->board.name, sizeof(mdev->model));
> -	if (udev->serial)
> -		strlcpy(mdev->serial, udev->serial, sizeof(mdev->serial));
> -	strcpy(mdev->bus_info, udev->devpath);
> -	mdev->hw_revision = le16_to_cpu(udev->descriptor.bcdDevice);
> -	mdev->driver_version = LINUX_VERSION_CODE;
> +		if (udev->product)
> +			strlcpy(mdev->model, udev->product,
> +				sizeof(mdev->model));

Why did you change that? On some boards, udev->product doesn't reflect
the brand name, but have just some random generic data.

Also, as the other logs associated with the device uses dev->board.name,
we want the media controller to use the same name here. Ok, if this
is null, we could use udev->product as a replacement.

> +		if (udev->serial)
> +			strlcpy(mdev->serial, udev->serial,
> +				sizeof(mdev->serial));
> +		strcpy(mdev->bus_info, udev->devpath);
> +		mdev->hw_revision = le16_to_cpu(udev->descriptor.bcdDevice);
>  
> -	media_device_init(mdev);
> +		media_device_init(mdev);
> +	}
>  
>  	dev->media_dev = mdev;
>  #endif

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