+static void free_resources(struct resources *res)
+{
+ if (!res)
+ return;
+
+#define free_resource(_res, __res, type, Type) \
+ do { \
+ int i; \
+ if (!(_res)->type##s) \
+ break; \
+ for (i = 0; i < (int)(_res)->__res->count_##type##s; ++i) { \
+ if (!(_res)->type##s[i].type) \
+ break; \
+ drmModeFree##Type((_res)->type##s[i].type); \
+ } \
+ free((_res)->type##s); \
+ } while (0)
+
+#define free_properties(_res, __res, type) \
+ do { \
+ int i; \
+ for (i = 0; i < (int)(_res)->__res->count_##type##s; ++i) { \
+ drmModeFreeObjectProperties(res->type##s[i].props); \
+ free(res->type##s[i].props_info); \
+ } \
+ } while (0)
+
+ if (res->res) {
+ free_properties(res, res, crtc);
+
+ free_resource(res, res, crtc, Crtc);
+ free_resource(res, res, encoder, Encoder);
+ free_resource(res, res, connector, Connector);
+ free_resource(res, res, fb, FB);
+
+ drmModeFreeResources(res->res);
+ }
+
+ if (res->plane_res) {
+ free_properties(res, plane_res, plane);
+
+ free_resource(res, plane_res, plane, Plane);
+
+ drmModeFreePlaneResources(res->plane_res);
+ }
+
+ free(res);
+}
+
+static struct resources *get_resources(struct device *dev)
+{
+ struct resources *res;
+ int i;
+
+ res = malloc(sizeof *res);
+ if (res == 0)
+ return NULL;
+
+ memset(res, 0, sizeof *res);
+
+ res->res = drmModeGetResources(dev->fd);
+ if (!res->res) {
+ fprintf(stderr, "drmModeGetResources failed: %s\n",
+ strerror(errno));
+ goto error;
+ }
+
+ res->crtcs = malloc(res->res->count_crtcs * sizeof *res->crtcs);
+ res->encoders = malloc(res->res->count_encoders * sizeof *res->encoders);
+ res->connectors = malloc(res->res->count_connectors * sizeof *res->connectors);
+ res->fbs = malloc(res->res->count_fbs * sizeof *res->fbs);
+
+ if (!res->crtcs || !res->encoders || !res->connectors || !res->fbs)
+ goto error;
+
+ memset(res->crtcs , 0, res->res->count_crtcs * sizeof *res->crtcs);
+ memset(res->encoders, 0, res->res->count_encoders * sizeof *res->encoders);
+ memset(res->connectors, 0, res->res->count_connectors * sizeof *res->connectors);
+ memset(res->fbs, 0, res->res->count_fbs * sizeof *res->fbs);
+
+#define get_resource(_res, __res, type, Type) \
+ do { \
+ int i; \
+ for (i = 0; i < (int)(_res)->__res->count_##type##s; ++i) { \
+ (_res)->type##s[i].type = \
+ drmModeGet##Type(dev->fd, (_res)->__res->type##s[i]); \
+ if (!(_res)->type##s[i].type) \
+ fprintf(stderr, "could not get %s %i: %s\n", \
+ #type, (_res)->__res->type##s[i], \
+ strerror(errno)); \
+ } \
+ } while (0)
+
+ get_resource(res, res, crtc, Crtc);
+ get_resource(res, res, encoder, Encoder);
+ get_resource(res, res, connector, Connector);
+ get_resource(res, res, fb, FB);
+
+#define get_properties(_res, __res, type, Type) \
+ do { \
+ int i; \
+ for (i = 0; i < (int)(_res)->__res->count_##type##s; ++i) { \
+ struct type *obj = &res->type##s[i]; \
+ unsigned int j; \
+ obj->props = \
+ drmModeObjectGetProperties(dev->fd, obj->type->type##_id, \
+ DRM_MODE_OBJECT_##Type); \
+ if (!obj->props) { \
+ fprintf(stderr, \
+ "could not get %s %i properties: %s\n", \
+ #type, obj->type->type##_id, \
+ strerror(errno)); \
+ continue; \
+ } \
+ obj->props_info = malloc(obj->props->count_props * \
+ sizeof *obj->props_info); \
+ if (!obj->props_info) \
+ continue; \
+ for (j = 0; j < obj->props->count_props; ++j) \
+ obj->props_info[j] = \
+ drmModeGetProperty(dev->fd, obj->props->props[j]); \
+ } \
+ } while (0)
+
+ get_properties(res, res, crtc, CRTC);
+ get_properties(res, res, connector, CONNECTOR);
+
+ for (i = 0; i < res->res->count_crtcs; ++i)
+ res->crtcs[i].mode = &res->crtcs[i].crtc->mode;
+
+ res->plane_res = drmModeGetPlaneResources(dev->fd);
+ if (!res->plane_res) {
+ fprintf(stderr, "drmModeGetPlaneResources failed: %s\n",
+ strerror(errno));
+ return res;
+ }
+
+ res->planes = malloc(res->plane_res->count_planes * sizeof *res->planes);
+ if (!res->planes)
+ goto error;
+
+ memset(res->planes, 0, res->plane_res->count_planes * sizeof *res->planes);
+
+ get_resource(res, plane_res, plane, Plane);
+ get_properties(res, plane_res, plane, PLANE);
+
+ return res;
+
+error:
+ free_resources(res);
+ return NULL;
+}
+
+static int get_crtc_index(struct device *dev, uint32_t id)
+{
+ int i;
+
+ for (i = 0; i < dev->resources->res->count_crtcs; ++i) {
+ drmModeCrtc *crtc = dev->resources->crtcs[i].crtc;
+ if (crtc && crtc->crtc_id == id)
+ return i;
+ }
+
+ return -1;
+}
+
+static drmModeConnector *get_connector_by_id(struct device *dev, uint32_t id)
+{
+ drmModeConnector *connector;
+ int i;
+
+ for (i = 0; i < dev->resources->res->count_connectors; i++) {
+ connector = dev->resources->connectors[i].connector;
+ if (connector && connector->connector_id == id)
+ return connector;
+ }
+
+ return NULL;
+}
+
+static drmModeEncoder *get_encoder_by_id(struct device *dev, uint32_t id)
+{
+ drmModeEncoder *encoder;
+ int i;
+
+ for (i = 0; i < dev->resources->res->count_encoders; i++) {
+ encoder = dev->resources->encoders[i].encoder;
+ if (encoder && encoder->encoder_id == id)
+ return encoder;
+ }
+
+ return NULL;
+}
+