diff mbox series

[1/6] media: uvcvideo: Add UVC_CTRL_FLAG_ENTITY_GET_INFO

Message ID 20201022133753.310506-2-ribalda@chromium.org (mailing list archive)
State New, archived
Headers show
Series Show privacy_gpio as a v4l2_ctrl | expand

Commit Message

Ricardo Ribalda Oct. 22, 2020, 1:37 p.m. UTC 
This flag allows controls to get their properties from an entity defined
function instead of via a query to the USB device.

Signed-off-by: Ricardo Ribalda <ribalda@chromium.org>
---
 drivers/media/usb/uvc/uvc_ctrl.c | 9 +++++++--
 drivers/media/usb/uvc/uvcvideo.h | 3 +++
 include/uapi/linux/uvcvideo.h    | 2 ++
 3 files changed, 12 insertions(+), 2 deletions(-)

Comments

Laurent Pinchart Nov. 4, 2020, 11:09 a.m. UTC | #1 
Hi Ricardo,

Thank you for the patch.

On Thu, Oct 22, 2020 at 03:37:48PM +0200, Ricardo Ribalda wrote:
> This flag allows controls to get their properties from an entity defined

s/entity defined/entity-defined/

> function instead of via a query to the USB device.
> 
> Signed-off-by: Ricardo Ribalda <ribalda@chromium.org>
> ---
>  drivers/media/usb/uvc/uvc_ctrl.c | 9 +++++++--
>  drivers/media/usb/uvc/uvcvideo.h | 3 +++
>  include/uapi/linux/uvcvideo.h    | 2 ++
>  3 files changed, 12 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/media/usb/uvc/uvc_ctrl.c b/drivers/media/usb/uvc/uvc_ctrl.c
> index f479d8971dfb..7acdc055613b 100644
> --- a/drivers/media/usb/uvc/uvc_ctrl.c
> +++ b/drivers/media/usb/uvc/uvc_ctrl.c
> @@ -1708,8 +1708,13 @@ static int uvc_ctrl_get_flags(struct uvc_device *dev,
>  	if (data == NULL)
>  		return -ENOMEM;
>  
> -	ret = uvc_query_ctrl(dev, UVC_GET_INFO, ctrl->entity->id, dev->intfnum,
> -			     info->selector, data, 1);
> +	if (ctrl->info.flags & UVC_CTRL_FLAG_ENTITY_GET_INFO)

Do we need the flag, couldn't we use entity->get_info if it is non-null,
and call uvc_query_ctrl() otherwise ?

> +		ret = ctrl->entity->get_info ?
> +			ctrl->entity->get_info(ctrl->entity, ctrl->info.selector, data) :
> +			-EINVAL;
> +	else
> +		ret = uvc_query_ctrl(dev, UVC_GET_INFO, ctrl->entity->id, dev->intfnum,
> +				     info->selector, data, 1);
>  	if (!ret)
>  		info->flags |= (data[0] & UVC_CONTROL_CAP_GET ?
>  				UVC_CTRL_FLAG_GET_CUR : 0)
> diff --git a/drivers/media/usb/uvc/uvcvideo.h b/drivers/media/usb/uvc/uvcvideo.h
> index a3dfacf069c4..08922d889bb6 100644
> --- a/drivers/media/usb/uvc/uvcvideo.h
> +++ b/drivers/media/usb/uvc/uvcvideo.h
> @@ -353,6 +353,9 @@ struct uvc_entity {
>  	u8 bNrInPins;
>  	u8 *baSourceID;
>  
> +	int (*get_info)(struct uvc_entity *entity, u8 cs, u8 *caps);
> +	int (*get_cur)(struct uvc_entity *entity, u8 cs, void *data, u16 size);

Looks like the second function should be part of patch 2/6 instead. I
would however squash 1/6 and 2/6.

> +
>  	unsigned int ncontrols;
>  	struct uvc_control *controls;
>  };
> diff --git a/include/uapi/linux/uvcvideo.h b/include/uapi/linux/uvcvideo.h
> index f80f05b3c423..69b636290c31 100644
> --- a/include/uapi/linux/uvcvideo.h
> +++ b/include/uapi/linux/uvcvideo.h
> @@ -30,6 +30,8 @@
>  #define UVC_CTRL_FLAG_AUTO_UPDATE	(1 << 7)
>  /* Control supports asynchronous reporting */
>  #define UVC_CTRL_FLAG_ASYNCHRONOUS	(1 << 8)
> +/* Entity queries */
> +#define UVC_CTRL_FLAG_ENTITY_GET_INFO	(1 << 9)
>  
>  #define UVC_CTRL_FLAG_GET_RANGE \
>  	(UVC_CTRL_FLAG_GET_CUR | UVC_CTRL_FLAG_GET_MIN | \
Ricardo Ribalda Nov. 4, 2020, 11:48 a.m. UTC | #2 
On Wed, Nov 4, 2020 at 12:10 PM Laurent Pinchart
<laurent.pinchart@ideasonboard.com> wrote:
>
> Hi Ricardo,
>
> Thank you for the patch.
>
> On Thu, Oct 22, 2020 at 03:37:48PM +0200, Ricardo Ribalda wrote:
> > This flag allows controls to get their properties from an entity defined
>
> s/entity defined/entity-defined/
>
> > function instead of via a query to the USB device.
> >
> > Signed-off-by: Ricardo Ribalda <ribalda@chromium.org>
> > ---
> >  drivers/media/usb/uvc/uvc_ctrl.c | 9 +++++++--
> >  drivers/media/usb/uvc/uvcvideo.h | 3 +++
> >  include/uapi/linux/uvcvideo.h    | 2 ++
> >  3 files changed, 12 insertions(+), 2 deletions(-)
> >
> > diff --git a/drivers/media/usb/uvc/uvc_ctrl.c b/drivers/media/usb/uvc/uvc_ctrl.c
> > index f479d8971dfb..7acdc055613b 100644
> > --- a/drivers/media/usb/uvc/uvc_ctrl.c
> > +++ b/drivers/media/usb/uvc/uvc_ctrl.c
> > @@ -1708,8 +1708,13 @@ static int uvc_ctrl_get_flags(struct uvc_device *dev,
> >       if (data == NULL)
> >               return -ENOMEM;
> >
> > -     ret = uvc_query_ctrl(dev, UVC_GET_INFO, ctrl->entity->id, dev->intfnum,
> > -                          info->selector, data, 1);
> > +     if (ctrl->info.flags & UVC_CTRL_FLAG_ENTITY_GET_INFO)
>
> Do we need the flag, couldn't we use entity->get_info if it is non-null,
> and call uvc_query_ctrl() otherwise ?

The idea behind the flag is to support in the same entity controls
that are uvc_query_ctrl() based
and "entity private functions".

As this moment, there is only the " GPIO entity"  that has has private
functions, and does not require it.

So I can simply remove the flag and add it later (if needed).

Thanks

>
> > +             ret = ctrl->entity->get_info ?
> > +                     ctrl->entity->get_info(ctrl->entity, ctrl->info.selector, data) :
> > +                     -EINVAL;
> > +     else
> > +             ret = uvc_query_ctrl(dev, UVC_GET_INFO, ctrl->entity->id, dev->intfnum,
> > +                                  info->selector, data, 1);
> >       if (!ret)
> >               info->flags |= (data[0] & UVC_CONTROL_CAP_GET ?
> >                               UVC_CTRL_FLAG_GET_CUR : 0)
> > diff --git a/drivers/media/usb/uvc/uvcvideo.h b/drivers/media/usb/uvc/uvcvideo.h
> > index a3dfacf069c4..08922d889bb6 100644
> > --- a/drivers/media/usb/uvc/uvcvideo.h
> > +++ b/drivers/media/usb/uvc/uvcvideo.h
> > @@ -353,6 +353,9 @@ struct uvc_entity {
> >       u8 bNrInPins;
> >       u8 *baSourceID;
> >
> > +     int (*get_info)(struct uvc_entity *entity, u8 cs, u8 *caps);
> > +     int (*get_cur)(struct uvc_entity *entity, u8 cs, void *data, u16 size);
>
> Looks like the second function should be part of patch 2/6 instead. I
> would however squash 1/6 and 2/6.
>
> > +
> >       unsigned int ncontrols;
> >       struct uvc_control *controls;
> >  };
> > diff --git a/include/uapi/linux/uvcvideo.h b/include/uapi/linux/uvcvideo.h
> > index f80f05b3c423..69b636290c31 100644
> > --- a/include/uapi/linux/uvcvideo.h
> > +++ b/include/uapi/linux/uvcvideo.h
> > @@ -30,6 +30,8 @@
> >  #define UVC_CTRL_FLAG_AUTO_UPDATE    (1 << 7)
> >  /* Control supports asynchronous reporting */
> >  #define UVC_CTRL_FLAG_ASYNCHRONOUS   (1 << 8)
> > +/* Entity queries */
> > +#define UVC_CTRL_FLAG_ENTITY_GET_INFO        (1 << 9)
> >
> >  #define UVC_CTRL_FLAG_GET_RANGE \
> >       (UVC_CTRL_FLAG_GET_CUR | UVC_CTRL_FLAG_GET_MIN | \
>
> --
> Regards,
>
> Laurent Pinchart
Laurent Pinchart Nov. 4, 2020, 12:08 p.m. UTC | #3 
Hi Ricardo,

On Wed, Nov 04, 2020 at 12:48:25PM +0100, Ricardo Ribalda wrote:
> On Wed, Nov 4, 2020 at 12:10 PM Laurent Pinchart wrote:
> > On Thu, Oct 22, 2020 at 03:37:48PM +0200, Ricardo Ribalda wrote:
> > > This flag allows controls to get their properties from an entity defined
> >
> > s/entity defined/entity-defined/
> >
> > > function instead of via a query to the USB device.
> > >
> > > Signed-off-by: Ricardo Ribalda <ribalda@chromium.org>
> > > ---
> > >  drivers/media/usb/uvc/uvc_ctrl.c | 9 +++++++--
> > >  drivers/media/usb/uvc/uvcvideo.h | 3 +++
> > >  include/uapi/linux/uvcvideo.h    | 2 ++
> > >  3 files changed, 12 insertions(+), 2 deletions(-)
> > >
> > > diff --git a/drivers/media/usb/uvc/uvc_ctrl.c b/drivers/media/usb/uvc/uvc_ctrl.c
> > > index f479d8971dfb..7acdc055613b 100644
> > > --- a/drivers/media/usb/uvc/uvc_ctrl.c
> > > +++ b/drivers/media/usb/uvc/uvc_ctrl.c
> > > @@ -1708,8 +1708,13 @@ static int uvc_ctrl_get_flags(struct uvc_device *dev,
> > >       if (data == NULL)
> > >               return -ENOMEM;
> > >
> > > -     ret = uvc_query_ctrl(dev, UVC_GET_INFO, ctrl->entity->id, dev->intfnum,
> > > -                          info->selector, data, 1);
> > > +     if (ctrl->info.flags & UVC_CTRL_FLAG_ENTITY_GET_INFO)
> >
> > Do we need the flag, couldn't we use entity->get_info if it is non-null,
> > and call uvc_query_ctrl() otherwise ?
> 
> The idea behind the flag is to support in the same entity controls
> that are uvc_query_ctrl() based
> and "entity private functions".
> 
> As this moment, there is only the " GPIO entity"  that has has private
> functions, and does not require it.
> 
> So I can simply remove the flag and add it later (if needed).

I hope we won't need more hacks of this kind ;-)

(It's a pretty clever hack I have to say)

> > > +             ret = ctrl->entity->get_info ?
> > > +                     ctrl->entity->get_info(ctrl->entity, ctrl->info.selector, data) :
> > > +                     -EINVAL;
> > > +     else
> > > +             ret = uvc_query_ctrl(dev, UVC_GET_INFO, ctrl->entity->id, dev->intfnum,
> > > +                                  info->selector, data, 1);
> > >       if (!ret)
> > >               info->flags |= (data[0] & UVC_CONTROL_CAP_GET ?
> > >                               UVC_CTRL_FLAG_GET_CUR : 0)
> > > diff --git a/drivers/media/usb/uvc/uvcvideo.h b/drivers/media/usb/uvc/uvcvideo.h
> > > index a3dfacf069c4..08922d889bb6 100644
> > > --- a/drivers/media/usb/uvc/uvcvideo.h
> > > +++ b/drivers/media/usb/uvc/uvcvideo.h
> > > @@ -353,6 +353,9 @@ struct uvc_entity {
> > >       u8 bNrInPins;
> > >       u8 *baSourceID;
> > >
> > > +     int (*get_info)(struct uvc_entity *entity, u8 cs, u8 *caps);
> > > +     int (*get_cur)(struct uvc_entity *entity, u8 cs, void *data, u16 size);
> >
> > Looks like the second function should be part of patch 2/6 instead. I
> > would however squash 1/6 and 2/6.
> >
> > > +
> > >       unsigned int ncontrols;
> > >       struct uvc_control *controls;
> > >  };
> > > diff --git a/include/uapi/linux/uvcvideo.h b/include/uapi/linux/uvcvideo.h
> > > index f80f05b3c423..69b636290c31 100644
> > > --- a/include/uapi/linux/uvcvideo.h
> > > +++ b/include/uapi/linux/uvcvideo.h
> > > @@ -30,6 +30,8 @@
> > >  #define UVC_CTRL_FLAG_AUTO_UPDATE    (1 << 7)
> > >  /* Control supports asynchronous reporting */
> > >  #define UVC_CTRL_FLAG_ASYNCHRONOUS   (1 << 8)
> > > +/* Entity queries */
> > > +#define UVC_CTRL_FLAG_ENTITY_GET_INFO        (1 << 9)
> > >
> > >  #define UVC_CTRL_FLAG_GET_RANGE \
> > >       (UVC_CTRL_FLAG_GET_CUR | UVC_CTRL_FLAG_GET_MIN | \
diff mbox series

Patch

diff --git a/drivers/media/usb/uvc/uvc_ctrl.c b/drivers/media/usb/uvc/uvc_ctrl.c
index f479d8971dfb..7acdc055613b 100644
--- a/drivers/media/usb/uvc/uvc_ctrl.c
+++ b/drivers/media/usb/uvc/uvc_ctrl.c
@@ -1708,8 +1708,13 @@  static int uvc_ctrl_get_flags(struct uvc_device *dev,
 	if (data == NULL)
 		return -ENOMEM;
 
-	ret = uvc_query_ctrl(dev, UVC_GET_INFO, ctrl->entity->id, dev->intfnum,
-			     info->selector, data, 1);
+	if (ctrl->info.flags & UVC_CTRL_FLAG_ENTITY_GET_INFO)
+		ret = ctrl->entity->get_info ?
+			ctrl->entity->get_info(ctrl->entity, ctrl->info.selector, data) :
+			-EINVAL;
+	else
+		ret = uvc_query_ctrl(dev, UVC_GET_INFO, ctrl->entity->id, dev->intfnum,
+				     info->selector, data, 1);
 	if (!ret)
 		info->flags |= (data[0] & UVC_CONTROL_CAP_GET ?
 				UVC_CTRL_FLAG_GET_CUR : 0)
diff --git a/drivers/media/usb/uvc/uvcvideo.h b/drivers/media/usb/uvc/uvcvideo.h
index a3dfacf069c4..08922d889bb6 100644
--- a/drivers/media/usb/uvc/uvcvideo.h
+++ b/drivers/media/usb/uvc/uvcvideo.h
@@ -353,6 +353,9 @@  struct uvc_entity {
 	u8 bNrInPins;
 	u8 *baSourceID;
 
+	int (*get_info)(struct uvc_entity *entity, u8 cs, u8 *caps);
+	int (*get_cur)(struct uvc_entity *entity, u8 cs, void *data, u16 size);
+
 	unsigned int ncontrols;
 	struct uvc_control *controls;
 };
diff --git a/include/uapi/linux/uvcvideo.h b/include/uapi/linux/uvcvideo.h
index f80f05b3c423..69b636290c31 100644
--- a/include/uapi/linux/uvcvideo.h
+++ b/include/uapi/linux/uvcvideo.h
@@ -30,6 +30,8 @@ 
 #define UVC_CTRL_FLAG_AUTO_UPDATE	(1 << 7)
 /* Control supports asynchronous reporting */
 #define UVC_CTRL_FLAG_ASYNCHRONOUS	(1 << 8)
+/* Entity queries */
+#define UVC_CTRL_FLAG_ENTITY_GET_INFO	(1 << 9)
 
 #define UVC_CTRL_FLAG_GET_RANGE \
 	(UVC_CTRL_FLAG_GET_CUR | UVC_CTRL_FLAG_GET_MIN | \