[RFCv1 02/12] drm: add object property type

[Rob Clark <robdclark@gmail.com>]

An object property is an id (idr) for a drm mode object.  This
will allow a property to be used set/get a framebuffer, CRTC, etc.
---
 drivers/gpu/drm/drm_crtc.c  | 34 ++++++++++++++++++++++++++++++----
 include/drm/drm_crtc.h      | 10 ++++++++++
 include/uapi/drm/drm_mode.h |  1 +
 3 files changed, 41 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/drm_crtc.c b/drivers/gpu/drm/drm_crtc.c
index f2a6d72..471cf16 100644
--- a/drivers/gpu/drm/drm_crtc.c
+++ b/drivers/gpu/drm/drm_crtc.c
@@ -2776,6 +2776,8 @@ struct drm_property *drm_property_create(struct drm_device *dev, int flags,
 	if (!property)
 		return NULL;
 
+	property->dev = dev;
+
 	if (num_values) {
 		property->values = kzalloc(sizeof(uint64_t)*num_values, GFP_KERNEL);
 		if (!property->values)
@@ -2879,6 +2881,23 @@ struct drm_property *drm_property_create_range(struct drm_device *dev, int flags
 }
 EXPORT_SYMBOL(drm_property_create_range);
 
+struct drm_property *drm_property_create_object(struct drm_device *dev,
+					 int flags, const char *name, uint32_t type)
+{
+	struct drm_property *property;
+
+	flags |= DRM_MODE_PROP_OBJECT;
+
+	property = drm_property_create(dev, flags, name, 1);
+	if (!property)
+		return NULL;
+
+	property->values[0] = type;
+
+	return property;
+}
+EXPORT_SYMBOL(drm_property_create_object);
+
 int drm_property_add_enum(struct drm_property *property, int index,
 			  uint64_t value, const char *name)
 {
@@ -3207,6 +3226,11 @@ static bool drm_property_change_is_valid(struct drm_property *property,
 	} else if (property->flags & DRM_MODE_PROP_BLOB) {
 		/* Only the driver knows */
 		return true;
+	} else if (property->flags & DRM_MODE_PROP_OBJECT) {
+		/* a zero value for an object property translates to null: */
+		if (value == 0)
+			return true;
+		return drm_property_get_obj(property, value) != NULL;
 	} else {
 		int i;
 		for (i = 0; i < property->num_values; i++)
@@ -3283,9 +3307,9 @@ static int drm_mode_plane_set_obj_prop(struct drm_plane *plane,
 	return ret;
 }
 
-static int drm_mode_set_obj_prop(struct drm_device *dev,
-		struct drm_mode_object *obj, void *state,
-		struct drm_property *property, uint64_t value, void *blob_data)
+static int drm_mode_set_obj_prop(struct drm_mode_object *obj,
+		void *state, struct drm_property *property, 
+		uint64_t value, void *blob_data)
 {
 	if (drm_property_change_is_valid(property, value)) {
 		switch (obj->type) {
@@ -3299,6 +3323,8 @@ static int drm_mode_set_obj_prop(struct drm_device *dev,
 			return drm_mode_plane_set_obj_prop(obj_to_plane(obj),
 					state, property, value, blob_data);
 		}
+	} else {
+		DRM_DEBUG("invalid value: %s = %llx\n", property->name, value);
 	}
 
 	return -EINVAL;
@@ -3333,7 +3359,7 @@ static int drm_mode_set_obj_prop_id(struct drm_device *dev, void *state,
 		return -EINVAL;
 	property = obj_to_property(prop_obj);
 
-	return drm_mode_set_obj_prop(dev, arg_obj, state, property,
+	return drm_mode_set_obj_prop(arg_obj, state, property, 
 			value, blob_data);
 }
 
diff --git a/include/drm/drm_crtc.h b/include/drm/drm_crtc.h
index ad4e1ce..77c8f11 100644
--- a/include/drm/drm_crtc.h
+++ b/include/drm/drm_crtc.h
@@ -297,6 +297,7 @@ struct drm_property {
 	char name[DRM_PROP_NAME_LEN];
 	uint32_t num_values;
 	uint64_t *values;
+	struct drm_device *dev;
 
 	struct list_head enum_blob_list;
 };
@@ -1030,6 +1031,8 @@ struct drm_property *drm_property_create_bitmask(struct drm_device *dev,
 struct drm_property *drm_property_create_range(struct drm_device *dev, int flags,
 					 const char *name,
 					 uint64_t min, uint64_t max);
+struct drm_property *drm_property_create_object(struct drm_device *dev,
+					 int flags, const char *name, uint32_t type);
 extern void drm_property_destroy(struct drm_device *dev, struct drm_property *property);
 extern int drm_property_add_enum(struct drm_property *property, int index,
 				 uint64_t value, const char *name);
@@ -1048,6 +1051,13 @@ extern int drm_mode_crtc_set_gamma_size(struct drm_crtc *crtc,
 					 int gamma_size);
 extern struct drm_mode_object *drm_mode_object_find(struct drm_device *dev,
 		uint32_t id, uint32_t type);
+
+static inline struct drm_mode_object *
+drm_property_get_obj(struct drm_property *property, uint64_t value)
+{
+	return drm_mode_object_find(property->dev, value, property->values[0]);
+}
+
 /* IOCTLs */
 extern int drm_mode_getresources(struct drm_device *dev,
 				 void *data, struct drm_file *file_priv);
diff --git a/include/uapi/drm/drm_mode.h b/include/uapi/drm/drm_mode.h
index 5508117..35921ba 100644
--- a/include/uapi/drm/drm_mode.h
+++ b/include/uapi/drm/drm_mode.h
@@ -231,6 +231,7 @@ struct drm_mode_get_connector {
 #define DRM_MODE_PROP_ENUM	(1<<3) /* enumerated type with text strings */
 #define DRM_MODE_PROP_BLOB	(1<<4)
 #define DRM_MODE_PROP_BITMASK	(1<<5) /* bitmask of enumerated types */
+#define DRM_MODE_PROP_OBJECT	(1<<6) /* drm mode object */
 
 struct drm_mode_property_enum {
 	__u64 value;
-- 
1.8.3.1