On 08/07/2018 12:28 PM, Hans Verkuil wrote:
> From: Hans Verkuil <[email protected]>
>
> Add a new topology struct that includes properties.
>
> Signed-off-by: Hans Verkuil <[email protected]>
> ---
> include/uapi/linux/media.h | 40 ++++++++++++++++++++++++++++++++++++++
> 1 file changed, 40 insertions(+)
>
> diff --git a/include/uapi/linux/media.h b/include/uapi/linux/media.h
> index 36f76e777ef9..1910c091601e 100644
> --- a/include/uapi/linux/media.h
> +++ b/include/uapi/linux/media.h
> @@ -342,6 +342,40 @@ struct media_v2_link {
> __u32 reserved[6];
> } __attribute__ ((packed));
>
> +#define MEDIA_PROP_TYPE_U64 1
> +#define MEDIA_PROP_TYPE_S64 2
> +#define MEDIA_PROP_TYPE_STRING 3
> +
> +/**
> + * struct media_v2_prop - A media property
> + *
> + * @id: The unique non-zero ID of this property
> + * @owner_id: The ID of the object this property belongs to
> + * @type: Property type
> + * @flags: Property flags
> + * @payload_size: Property payload size, 0 for U64/S64
> + * @payload_offset: Property payload starts at this offset from &prop.id.
> + * This is 0 for U64/S64.
> + * @reserved: Property reserved field, will be zeroed.
> + * @name: Property name
> + * @uval: Property value (unsigned)
> + * @sval: Property value (signed)
> + */
> +struct media_v2_prop {
> + __u32 id;
> + __u32 owner_id;
> + __u32 type;
> + __u32 flags;
> + __u32 payload_size;
> + __u32 payload_offset;
> + __u32 reserved[18];
> + char name[32];
> + union {
> + __u64 uval;
> + __s64 sval;
> + };
I'm inclined to drop this union and always use payload_size/offset.
Just add simple access functions here to get to the payload:
static inline const char *media_prop2s(const struct media_v2_prop *prop)
{
return (const char *)prop + prop->payload_offset;
}
static inline __u64 media_prop2u64(const struct media_v2_prop *prop)
{
return *(const __u64 *)((const char *)prop + prop->payload_offset);
}
static inline __s64 media_prop2s64(const struct media_v2_prop *prop)
{
return *(const __s64 *)((const char *)prop + prop->payload_offset);
}
Regards,
Hans
> +} __attribute__ ((packed));
> +
> struct media_v2_topology {
> __u64 topology_version;
>
> @@ -360,6 +394,10 @@ struct media_v2_topology {
> __u32 num_links;
> __u32 reserved4;
> __u64 ptr_links;
> +
> + __u32 num_props;
> + __u32 props_payload_size;
> + __u64 ptr_props;
> } __attribute__ ((packed));
>
> /* ioctls */
> @@ -368,6 +406,8 @@ struct media_v2_topology {
> #define MEDIA_IOC_ENUM_ENTITIES _IOWR('|', 0x01, struct
> media_entity_desc)
> #define MEDIA_IOC_ENUM_LINKS _IOWR('|', 0x02, struct media_links_enum)
> #define MEDIA_IOC_SETUP_LINK _IOWR('|', 0x03, struct media_link_desc)
> +/* Old MEDIA_IOC_G_TOPOLOGY ioctl without props support */
> +#define MEDIA_IOC_G_TOPOLOGY_OLD 0xc0487c04
> #define MEDIA_IOC_G_TOPOLOGY _IOWR('|', 0x04, struct media_v2_topology)
>
> #ifndef __KERNEL__
>
