[RFCv5 PATCH 1/4] uapi/linux/media.h: add property support

[hverkuil-cisco]

From: Hans Verkuil <hans.verk...@cisco.com>

Extend the topology struct with a properties array.

Add a new media_v2_prop structure to store property information.

Signed-off-by: Hans Verkuil <hans.verk...@cisco.com>
---
 include/uapi/linux/media.h | 56 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 56 insertions(+)

diff --git a/include/uapi/linux/media.h b/include/uapi/linux/media.h
index e5d0c5c611b5..12982327381e 100644
--- a/include/uapi/linux/media.h
+++ b/include/uapi/linux/media.h
@@ -342,6 +342,58 @@ struct media_v2_link {
        __u32 reserved[6];
 } __attribute__ ((packed));
 
+#define MEDIA_PROP_TYPE_GROUP  1
+#define MEDIA_PROP_TYPE_U64    2
+#define MEDIA_PROP_TYPE_S64    3
+#define MEDIA_PROP_TYPE_STRING 4
+
+#define MEDIA_OWNER_TYPE_ENTITY                        0
+#define MEDIA_OWNER_TYPE_PAD                   1
+#define MEDIA_OWNER_TYPE_LINK                  2
+#define MEDIA_OWNER_TYPE_INTF                  3
+#define MEDIA_OWNER_TYPE_PROP                  4
+
+/**
+ * struct media_v2_prop - A media property
+ *
+ * @id:                The unique non-zero ID of this property
+ * @type:      Property type
+ * @owner_id:  The ID of the object this property belongs to
+ * @owner_type:        The type of the object this property belongs to
+ * @flags:     Property flags
+ * @name:      Property name
+ * @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.
+ */
+struct media_v2_prop {
+       __u32 id;
+       __u32 type;
+       __u32 owner_id;
+       __u32 owner_type;
+       __u32 flags;
+       char name[32];
+       __u32 payload_size;
+       __u32 payload_offset;
+       __u32 reserved[18];
+} __attribute__ ((packed));
+
+static inline const char *media_prop2string(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);
+}
+
 struct media_v2_topology {
        __u64 topology_version;
 
@@ -360,6 +412,10 @@ 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 */
-- 
2.19.2