[PATCH 4/5 libdrm] Add support for CRTC properties

[Paulo Zanoni]

From: Paulo Zanoni <paulo.r.zanoni at intel.com>

New library calls:
- drmModeCrtcGetProperties
- drmModeFreeCrtcProperties
- drmModeCrtcSetProperties

Signed-off-by: Paulo Zanoni <paulo.r.zanoni at intel.com>
---
 include/drm/drm.h      |    2 +
 include/drm/drm_mode.h |   13 ++++++++
 xf86drmMode.c          |   79 ++++++++++++++++++++++++++++++++++++++++++++++++
 xf86drmMode.h          |   12 +++++++
 4 files changed, 106 insertions(+), 0 deletions(-)

diff --git a/include/drm/drm.h b/include/drm/drm.h
index 8adb9d5..45eef57 100644
--- a/include/drm/drm.h
+++ b/include/drm/drm.h
@@ -717,6 +717,8 @@ struct drm_get_cap {
 #define DRM_IOCTL_MODE_GETPLANE	DRM_IOWR(0xB6, struct drm_mode_get_plane)
 #define DRM_IOCTL_MODE_SETPLANE	DRM_IOWR(0xB7, struct drm_mode_set_plane)
 #define DRM_IOCTL_MODE_ADDFB2		DRM_IOWR(0xB8, struct drm_mode_fb_cmd2)
+#define DRM_IOCTL_MODE_CRTC_GETPROPERTIES	DRM_IOWR(0xB9, struct drm_mode_crtc_get_properties)
+#define DRM_IOCTL_MODE_CRTC_SETPROPERTY	DRM_IOWR(0xBA, struct drm_mode_crtc_set_property)
 
 /**
  * Device specific ioctls should only be in their respective headers
diff --git a/include/drm/drm_mode.h b/include/drm/drm_mode.h
index f36c61a..2bc6b83 100644
--- a/include/drm/drm_mode.h
+++ b/include/drm/drm_mode.h
@@ -250,6 +250,19 @@ struct drm_mode_connector_set_property {
 	__u32 connector_id;
 };
 
+struct drm_mode_crtc_get_properties {
+	__u64 props_ptr;
+	__u64 prop_values_ptr;
+	__u32 count_props;
+	__u32 crtc_id;
+};
+
+struct drm_mode_crtc_set_property {
+	__u64 value;
+	__u32 prop_id;
+	__u32 crtc_id;
+};
+
 struct drm_mode_get_blob {
 	__u32 blob_id;
 	__u32 length;
diff --git a/xf86drmMode.c b/xf86drmMode.c
index c809c44..67cbc02 100644
--- a/xf86drmMode.c
+++ b/xf86drmMode.c
@@ -974,3 +974,82 @@ void drmModeFreePlaneResources(drmModePlaneResPtr ptr)
 	drmFree(ptr->planes);
 	drmFree(ptr);
 }
+
+drmModeCrtcPropertiesPtr drmModeCrtcGetProperties(int fd, uint32_t crtc_id)
+{
+	struct drm_mode_crtc_get_properties properties;
+	drmModeCrtcPropertiesPtr ret = NULL;
+	uint32_t count;
+
+retry:
+	memset(&properties, 0, sizeof(struct drm_mode_crtc_get_properties));
+	properties.crtc_id = crtc_id;
+
+	if (drmIoctl(fd, DRM_IOCTL_MODE_CRTC_GETPROPERTIES, &properties))
+		return 0;
+
+	count = properties.count_props;
+
+	if (count) {
+		properties.props_ptr = VOID2U64(drmMalloc(count *
+							  sizeof(uint32_t)));
+		if (!properties.props_ptr)
+			goto err_allocs;
+		properties.prop_values_ptr = VOID2U64(drmMalloc(count *
+						      sizeof(uint64_t)));
+		if (!properties.prop_values_ptr)
+			goto err_allocs;
+	}
+
+	if (drmIoctl(fd, DRM_IOCTL_MODE_CRTC_GETPROPERTIES, &properties))
+		goto err_allocs;
+
+	if (count < properties.count_props) {
+		drmFree(U642VOID(properties.props_ptr));
+		drmFree(U642VOID(properties.prop_values_ptr));
+		goto retry;
+	}
+	count = properties.count_props;
+
+	ret = drmMalloc(sizeof(*ret));
+	if (!ret)
+		goto err_allocs;
+
+	ret->count_props = count;
+	ret->props = drmAllocCpy(U642VOID(properties.props_ptr),
+				 count, sizeof(uint32_t));
+	ret->prop_values = drmAllocCpy(U642VOID(properties.prop_values_ptr),
+				       count, sizeof(uint64_t));
+	if (ret->count_props && (!ret->props || !ret->prop_values)) {
+		drmFree(ret->props);
+		drmFree(ret->prop_values);
+		drmFree(ret);
+		ret = NULL;
+	}
+
+err_allocs:
+	drmFree(U642VOID(properties.props_ptr));
+	drmFree(U642VOID(properties.prop_values_ptr));
+	return ret;
+}
+
+void drmModeFreeCrtcProperties(drmModeCrtcPropertiesPtr ptr)
+{
+	if (!ptr)
+		return;
+	drmFree(ptr->props);
+	drmFree(ptr->prop_values);
+	drmFree(ptr);
+}
+
+int drmModeCrtcSetProperty(int fd, uint32_t crtc_id, uint32_t property_id,
+			   uint64_t value)
+{
+	struct drm_mode_crtc_set_property prop;
+
+	prop.value = value;
+	prop.prop_id = property_id;
+	prop.crtc_id = crtc_id;
+
+	return DRM_IOCTL(fd, DRM_IOCTL_MODE_CRTC_SETPROPERTY, &prop);
+}
diff --git a/xf86drmMode.h b/xf86drmMode.h
index 991e3f9..f2733ec 100644
--- a/xf86drmMode.h
+++ b/xf86drmMode.h
@@ -281,6 +281,12 @@ typedef struct _drmModeConnector {
 	uint32_t *encoders; /**< List of encoder ids */
 } drmModeConnector, *drmModeConnectorPtr;
 
+typedef struct _drmModeCrtcProperties {
+	uint32_t count_props;
+	uint32_t *props;
+	uint64_t *prop_values;
+} drmModeCrtcProperties, *drmModeCrtcPropertiesPtr;
+
 typedef struct _drmModePlane {
 	uint32_t count_formats;
 	uint32_t *formats;
@@ -428,6 +434,12 @@ extern int drmModeSetPlane(int fd, uint32_t plane_id, uint32_t crtc_id,
 			   uint32_t src_x, uint32_t src_y,
 			   uint32_t src_w, uint32_t src_h);
 
+extern drmModeCrtcPropertiesPtr drmModeCrtcGetProperties(int fd,
+							 uint32_t crtc_id);
+extern void drmModeFreeCrtcProperties(drmModeCrtcPropertiesPtr ptr);
+extern int drmModeCrtcSetProperty(int fd, uint32_t crtc_id,
+				  uint32_t property_id, uint64_t value);
+
 #if defined(__cplusplus) || defined(c_plusplus)
 }
 #endif
-- 
1.7.9.1