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Date: Fri, 6 Nov 2020 09:45:27 +0100
From: Ricardo Ribalda <ribalda@...omium.org>
To: Laurent Pinchart <laurent.pinchart@...asonboard.com>
Cc: Mauro Carvalho Chehab <mchehab@...nel.org>,
linux-media@...r.kernel.org,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 2/7] media: uvcvideo: Move guid to entity
Hi Laurent
Thanks for the review
On Fri, Nov 6, 2020 at 7:06 AM Laurent Pinchart
<laurent.pinchart@...asonboard.com> wrote:
>
> Hi Ricardo,
>
> Thank you for the patch.
>
> On Wed, Nov 04, 2020 at 07:07:29PM +0100, Ricardo Ribalda wrote:
> > Instead of having multiple copies of the entity guid on the code, move
> > it to the entity structure.
> >
> > Signed-off-by: Ricardo Ribalda <ribalda@...omium.org>
> > ---
> > drivers/media/usb/uvc/uvc_ctrl.c | 30 ++++--------------------------
> > drivers/media/usb/uvc/uvc_driver.c | 21 +++++++++++++++++++--
> > drivers/media/usb/uvc/uvcvideo.h | 2 +-
> > 3 files changed, 24 insertions(+), 29 deletions(-)
> >
> > diff --git a/drivers/media/usb/uvc/uvc_ctrl.c b/drivers/media/usb/uvc/uvc_ctrl.c
> > index f479d8971dfb..0e480b75e724 100644
> > --- a/drivers/media/usb/uvc/uvc_ctrl.c
> > +++ b/drivers/media/usb/uvc/uvc_ctrl.c
> > @@ -826,31 +826,10 @@ static void uvc_set_le_value(struct uvc_control_mapping *mapping,
> > * Terminal and unit management
> > */
> >
> > -static const u8 uvc_processing_guid[16] = UVC_GUID_UVC_PROCESSING;
> > -static const u8 uvc_camera_guid[16] = UVC_GUID_UVC_CAMERA;
> > -static const u8 uvc_media_transport_input_guid[16] =
> > - UVC_GUID_UVC_MEDIA_TRANSPORT_INPUT;
> > -
> > static int uvc_entity_match_guid(const struct uvc_entity *entity,
> > - const u8 guid[16])
> > + const u8 guid[16])
> > {
> > - switch (UVC_ENTITY_TYPE(entity)) {
> > - case UVC_ITT_CAMERA:
> > - return memcmp(uvc_camera_guid, guid, 16) == 0;
> > -
> > - case UVC_ITT_MEDIA_TRANSPORT_INPUT:
> > - return memcmp(uvc_media_transport_input_guid, guid, 16) == 0;
> > -
> > - case UVC_VC_PROCESSING_UNIT:
> > - return memcmp(uvc_processing_guid, guid, 16) == 0;
> > -
> > - case UVC_VC_EXTENSION_UNIT:
> > - return memcmp(entity->extension.guidExtensionCode,
> > - guid, 16) == 0;
> > -
> > - default:
> > - return 0;
> > - }
> > + return memcmp(entity->guid, guid, sizeof(entity->guid)) == 0;
> > }
> >
> > /* ------------------------------------------------------------------------
> > @@ -1776,8 +1755,7 @@ static int uvc_ctrl_fill_xu_info(struct uvc_device *dev,
> > if (data == NULL)
> > return -ENOMEM;
> >
> > - memcpy(info->entity, ctrl->entity->extension.guidExtensionCode,
> > - sizeof(info->entity));
> > + memcpy(info->entity, ctrl->entity->guid, sizeof(info->entity));
> > info->index = ctrl->index;
> > info->selector = ctrl->index + 1;
> >
> > @@ -1883,7 +1861,7 @@ int uvc_xu_ctrl_query(struct uvc_video_chain *chain,
> >
> > if (!found) {
> > uvc_trace(UVC_TRACE_CONTROL, "Control %pUl/%u not found.\n",
> > - entity->extension.guidExtensionCode, xqry->selector);
> > + entity->guid, xqry->selector);
> > return -ENOENT;
> > }
> >
> > diff --git a/drivers/media/usb/uvc/uvc_driver.c b/drivers/media/usb/uvc/uvc_driver.c
> > index 9fc0b600eab1..77fea26faa9a 100644
> > --- a/drivers/media/usb/uvc/uvc_driver.c
> > +++ b/drivers/media/usb/uvc/uvc_driver.c
> > @@ -1019,6 +1019,11 @@ static int uvc_parse_streaming(struct uvc_device *dev,
> > return ret;
> > }
> >
> > +static const u8 uvc_camera_guid[16] = UVC_GUID_UVC_CAMERA;
> > +static const u8 uvc_media_transport_input_guid[16] =
> > + UVC_GUID_UVC_MEDIA_TRANSPORT_INPUT;
> > +static const u8 uvc_processing_guid[16] = UVC_GUID_UVC_PROCESSING;
> > +
> > static struct uvc_entity *uvc_alloc_entity(u16 type, u8 id,
> > unsigned int num_pads, unsigned int extra_size)
> > {
> > @@ -1038,6 +1043,18 @@ static struct uvc_entity *uvc_alloc_entity(u16 type, u8 id,
> > entity->id = id;
> > entity->type = type;
> >
> > + switch (type) {
> > + case UVC_ITT_CAMERA:
> > + memcpy(entity->guid, uvc_camera_guid, 16);
> > + break;
> > + case UVC_ITT_MEDIA_TRANSPORT_INPUT:
> > + memcpy(entity->guid, uvc_media_transport_input_guid, 16);
> > + break;
> > + case UVC_VC_PROCESSING_UNIT:
> > + memcpy(entity->guid, uvc_processing_guid, 16);
> > + break;
> > + }
>
> Given that the GUID is set in uvc_parse_vendor_control() and
> uvc_parse_standard_control() for extension units, I'm wondering if it
> would make sense to move it there for the other entity types too. Up to
> you. Otherwise, I'd add the following comment above the switch:
>
> /*
> * Set the GUID for standard entity types. For extension units, the GUID
> * is initialized by the caller.
> */
I added the comment. So far I am working on
https://github.com/ribalda/linux/tree/uvctest-v3
Please let me know when you are ready with v2, to send v3 to the mailing list.
Thanks!
> Reviewed-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>
>
> > +
> > entity->num_links = 0;
> > entity->num_pads = num_pads;
> > entity->pads = ((void *)(entity + 1)) + extra_size;
> > @@ -1109,7 +1126,7 @@ static int uvc_parse_vendor_control(struct uvc_device *dev,
> > if (unit == NULL)
> > return -ENOMEM;
> >
> > - memcpy(unit->extension.guidExtensionCode, &buffer[4], 16);
> > + memcpy(unit->guid, &buffer[4], 16);
> > unit->extension.bNumControls = buffer[20];
> > memcpy(unit->baSourceID, &buffer[22], p);
> > unit->extension.bControlSize = buffer[22+p];
> > @@ -1368,7 +1385,7 @@ static int uvc_parse_standard_control(struct uvc_device *dev,
> > if (unit == NULL)
> > return -ENOMEM;
> >
> > - memcpy(unit->extension.guidExtensionCode, &buffer[4], 16);
> > + memcpy(unit->guid, &buffer[4], 16);
> > unit->extension.bNumControls = buffer[20];
> > memcpy(unit->baSourceID, &buffer[22], p);
> > unit->extension.bControlSize = buffer[22+p];
> > diff --git a/drivers/media/usb/uvc/uvcvideo.h b/drivers/media/usb/uvc/uvcvideo.h
> > index a3dfacf069c4..df7bf2d104a3 100644
> > --- a/drivers/media/usb/uvc/uvcvideo.h
> > +++ b/drivers/media/usb/uvc/uvcvideo.h
> > @@ -304,6 +304,7 @@ struct uvc_entity {
> > u8 id;
> > u16 type;
> > char name[64];
> > + u8 guid[16];
> >
> > /* Media controller-related fields. */
> > struct video_device *vdev;
> > @@ -342,7 +343,6 @@ struct uvc_entity {
> > } selector;
> >
> > struct {
> > - u8 guidExtensionCode[16];
> > u8 bNumControls;
> > u8 bControlSize;
> > u8 *bmControls;
>
> --
> Regards,
>
> Laurent Pinchart
--
Ricardo Ribalda
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