r600g: add family retrival

allow pipe driver to get the family of the gpu.

src/gallium/drivers/r600/r600_screen.c

@@ -41,7 +41,13 @@ static const char* r600_get_vendor(struct pipe_screen* pscreen)
 
 static const char* r600_get_name(struct pipe_screen* pscreen)
 {
-	return "R600/R700 (HD2XXX,HD3XXX,HD4XXX)";
+	struct r600_screen *screen = r600_screen(pscreen);
+	enum radeon_family family = radeon_get_family(screen->rw);
+
+	if (family >= CHIP_R600 && family < CHIP_RV770)
+		return "R600 (HD2XXX,HD3XXX)";
+	else
+		return "R700 (HD4XXX)";
 }
 
 static int r600_get_param(struct pipe_screen* pscreen, enum pipe_cap param)

src/gallium/drivers/r600/radeon.h

@@ -77,6 +77,8 @@ enum radeon_family {
 	CHIP_LAST,
 };
 
+enum radeon_family radeon_get_family(struct radeon *rw);
+
 /*
  * radeon object functions
  */

src/gallium/winsys/r600/drm/radeon.c

@@ -25,6 +25,11 @@
 #include "radeon_drm.h"
 #include "r600d.h"
 
+enum radeon_family radeon_get_family(struct radeon *radeon)
+{
+	return radeon->family;
+}
+
 static int radeon_get_device(struct radeon *radeon)
 {
 	struct drm_radeon_info info;