[PATCH 1/2] drm: add bitmask property type

[Rob Clark]

From: Rob Clark <rob at ti.com>

A bitmask property is similar to an enum.  The enum value is a bit
position (0-63), and valid property values consist of a mask of
zero or more of (1 << enum_val[n]).

Signed-off-by: Rob Clark <rob at ti.com>
---
 drivers/gpu/drm/drm_crtc.c |   46 +++++++++++++++++++++++++++++++++++++++++---
 include/drm/drm_crtc.h     |    3 +++
 include/drm/drm_mode.h     |    1 +
 3 files changed, 47 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/drm_crtc.c b/drivers/gpu/drm/drm_crtc.c
index 75661c8..022873e 100644
--- a/drivers/gpu/drm/drm_crtc.c
+++ b/drivers/gpu/drm/drm_crtc.c
@@ -2707,6 +2707,33 @@ struct drm_property *drm_property_create_enum(struct drm_device *dev, int flags,
 }
 EXPORT_SYMBOL(drm_property_create_enum);
 
+struct drm_property *drm_property_create_bitmask(struct drm_device *dev,
+					 int flags, const char *name,
+					 const struct drm_prop_enum_list *props, int num_values)
+{
+	struct drm_property *property;
+	int i, ret;
+
+	flags |= DRM_MODE_PROP_BITMASK;
+
+	property = drm_property_create(dev, flags, name, num_values);
+	if (!property)
+		return NULL;
+
+	for (i = 0; i < num_values; i++) {
+		ret = drm_property_add_enum(property, i,
+				      props[i].type,
+				      props[i].name);
+		if (ret) {
+			drm_property_destroy(dev, property);
+			return NULL;
+		}
+	}
+
+	return property;
+}
+EXPORT_SYMBOL(drm_property_create_bitmask);
+
 struct drm_property *drm_property_create_range(struct drm_device *dev, int flags,
 					 const char *name,
 					 uint64_t min, uint64_t max)
@@ -2731,7 +2758,14 @@ int drm_property_add_enum(struct drm_property *property, int index,
 {
 	struct drm_property_enum *prop_enum;
 
-	if (!(property->flags & DRM_MODE_PROP_ENUM))
+	if (!(property->flags & (DRM_MODE_PROP_ENUM | DRM_MODE_PROP_BITMASK)))
+		return -EINVAL;
+
+	/*
+	 * Bitmask enum properties have the additional constraint of values
+	 * from 0 to 63
+	 */
+	if ((property->flags & DRM_MODE_PROP_BITMASK) && (value > 63))
 		return -EINVAL;
 
 	if (!list_empty(&property->enum_blob_list)) {
@@ -2875,7 +2909,7 @@ int drm_mode_getproperty_ioctl(struct drm_device *dev,
 	}
 	property = obj_to_property(obj);
 
-	if (property->flags & DRM_MODE_PROP_ENUM) {
+	if (property->flags & (DRM_MODE_PROP_ENUM | DRM_MODE_PROP_BITMASK)) {
 		list_for_each_entry(prop_enum, &property->enum_blob_list, head)
 			enum_count++;
 	} else if (property->flags & DRM_MODE_PROP_BLOB) {
@@ -2900,7 +2934,7 @@ int drm_mode_getproperty_ioctl(struct drm_device *dev,
 	}
 	out_resp->count_values = value_count;
 
-	if (property->flags & DRM_MODE_PROP_ENUM) {
+	if (property->flags & (DRM_MODE_PROP_ENUM | DRM_MODE_PROP_BITMASK)) {
 		if ((out_resp->count_enum_blobs >= enum_count) && enum_count) {
 			copied = 0;
 			enum_ptr = (struct drm_mode_property_enum __user *)(unsigned long)out_resp->enum_blob_ptr;
@@ -3055,6 +3089,12 @@ static bool drm_property_change_is_valid(struct drm_property *property,
 		if (value < property->values[0] || value > property->values[1])
 			return false;
 		return true;
+	} else if (property->flags & DRM_MODE_PROP_BITMASK) {
+		int i;
+		__u64 valid_mask = 0;
+		for (i = 0; i < property->num_values; i++)
+			valid_mask |= (1LL << property->values[i]);
+		return !(value & ~valid_mask);
 	} else {
 		int i;
 		for (i = 0; i < property->num_values; i++)
diff --git a/include/drm/drm_crtc.h b/include/drm/drm_crtc.h
index e194c78..39e3e1c 100644
--- a/include/drm/drm_crtc.h
+++ b/include/drm/drm_crtc.h
@@ -940,6 +940,9 @@ extern struct drm_property *drm_property_create_enum(struct drm_device *dev, int
 					 const char *name,
 					 const struct drm_prop_enum_list *props,
 					 int num_values);
+struct drm_property *drm_property_create_bitmask(struct drm_device *dev,
+					 int flags, const char *name,
+					 const struct drm_prop_enum_list *props, int num_values);
 struct drm_property *drm_property_create_range(struct drm_device *dev, int flags,
 					 const char *name,
 					 uint64_t min, uint64_t max);
diff --git a/include/drm/drm_mode.h b/include/drm/drm_mode.h
index 326f2be..5581980 100644
--- a/include/drm/drm_mode.h
+++ b/include/drm/drm_mode.h
@@ -230,6 +230,7 @@ struct drm_mode_get_connector {
 #define DRM_MODE_PROP_IMMUTABLE	(1<<2)
 #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 */
 
 struct drm_mode_property_enum {
 	__u64 value;
-- 
1.7.9.5