Em Wed, 03 Jun 2015 09:12:53 -0600
Shuah Khan <shuahkh@xxxxxxxxxxxxxxx> escreveu:
> Add new media controller API to allocate media device as a
> device resource. When a media device is created on the main
> struct device which is the parent device for the interface
> device, it will be available to all drivers associated with
> that interface. For example, if a usb media device driver
> creates the media device on the main struct device which is
> common for all the drivers that control the media device,
> including the non-media ALSA driver, media controller API
> can be used to share access to the resources on the media
> device. This new interface provides the above described
> feature. A second interface that finds and returns the media
> device is added to allow drivers to find the media device
> created by any of the drivers associated with the device.
>
> Signed-off-by: Shuah Khan <shuahkh@xxxxxxxxxxxxxxx>
> ---
> drivers/media/media-device.c | 33 +++++++++++++++++++++++++++++++++
> include/media/media-device.h | 2 ++
> 2 files changed, 35 insertions(+)
>
> diff --git a/drivers/media/media-device.c b/drivers/media/media-device.c
> index 7b39440..a4d5b24 100644
> --- a/drivers/media/media-device.c
> +++ b/drivers/media/media-device.c
> @@ -462,3 +462,36 @@ void media_device_unregister_entity(struct media_entity *entity)
> entity->parent = NULL;
> }
> EXPORT_SYMBOL_GPL(media_device_unregister_entity);
> +
> +static void media_device_release_devres(struct device *dev, void *res)
> +{
> +}
> +
> +/*
> + * media_device_get_devres() - get media device as device resource
> + * creates if one doesn't exist
> +*/
> +struct media_device *media_device_get_devres(struct device *dev)
> +{
> + struct media_device *mdev;
> +
> + mdev = devres_find(dev, media_device_release_devres, NULL, NULL);
> + if (mdev)
> + return mdev;
> +
> + mdev = devres_alloc(media_device_release_devres,
> + sizeof(struct media_device), GFP_KERNEL);
> + if (!mdev)
> + return NULL;
> + return devres_get(dev, mdev, NULL, NULL);
> +}
> +EXPORT_SYMBOL_GPL(media_device_get_devres);
> +
> +/*
> + * media_device_find_devres() - find media device as device resource
> +*/
> +struct media_device *media_device_find_devres(struct device *dev)
> +{
> + return devres_find(dev, media_device_release_devres, NULL, NULL);
> +}
> +EXPORT_SYMBOL_GPL(media_device_find_devres);
> diff --git a/include/media/media-device.h b/include/media/media-device.h
> index 6e6db78..22792cd 100644
> --- a/include/media/media-device.h
> +++ b/include/media/media-device.h
> @@ -95,6 +95,8 @@ void media_device_unregister(struct media_device *mdev);
> int __must_check media_device_register_entity(struct media_device *mdev,
> struct media_entity *entity);
> void media_device_unregister_entity(struct media_entity *entity);
> +struct media_device *media_device_get_devres(struct device *dev);
> +struct media_device *media_device_find_devres(struct device *dev);
Hmm... what happens if the Kernel is compiled without MC controller
support?
I think that the best would be to add a #ifdef at the header file and
provide an alternate dummy method to avoid the need of testing for it
everywhere.
>
> /* Iterate over all entities. */
> #define media_device_for_each_entity(entity, mdev) \
--
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