drm: add functions to get/set gamma ramps

2 files changed, 41 insertions, 0 deletions

diff --git a/libdrm/xf86drmMode.c b/libdrm/xf86drmMode.c
index d11fc12e..a393f965 100644
--- a/libdrm/xf86drmMode.c
+++ b/libdrm/xf86drmMode.c
@@ -657,3 +657,39 @@ int drmModeReplaceFB(int fd, uint32_t buffer_id,
 
 	return 0;
 }
+
+int drmModeCrtcGetGamma(int fd, uint32_t crtc_id, uint32_t size,
+			uint16_t *red, uint16_t *green, uint16_t *blue)
+{
+	int ret;
+	struct drm_mode_crtc_lut l;
+
+	l.crtc_id = crtc_id;
+	l.gamma_size = size;
+	l.red = VOID2U64(red);
+	l.green = VOID2U64(green);
+	l.blue = VOID2U64(blue);
+	
+	if ((ret = ioctl(fd, DRM_IOCTL_MODE_GETGAMMA, &l)))
+		return ret;
+
+	return 0;
+}
+
+int drmModeCrtcSetGamma(int fd, uint32_t crtc_id, uint32_t size,
+			uint16_t *red, uint16_t *green, uint16_t *blue)
+{
+	int ret;
+	struct drm_mode_crtc_lut l;
+
+	l.crtc_id = crtc_id;
+	l.gamma_size = size;
+	l.red = VOID2U64(red);
+	l.green = VOID2U64(green);
+	l.blue = VOID2U64(blue);
+	
+	if ((ret = ioctl(fd, DRM_IOCTL_MODE_SETGAMMA, &l)))
+		return ret;
+
+	return 0;
+}
diff --git a/libdrm/xf86drmMode.h b/libdrm/xf86drmMode.h
index 2f3a8f74..56908d8f 100644
--- a/libdrm/xf86drmMode.h
+++ b/libdrm/xf86drmMode.h
@@ -263,3 +263,8 @@ extern void drmModeFreePropertyBlob(drmModePropertyBlobPtr ptr);
 extern int drmModeConnectorSetProperty(int fd, uint32_t connector_id, uint32_t property_id,
 				    uint64_t value);
 extern int drmCheckModesettingSupported(const char *busid);
+
+extern int drmModeCrtcSetGamma(int fd, uint32_t crtc_id, uint32_t size,
+			       uint16_t *red, uint16_t *green, uint16_t *blue);
+extern int drmModeCrtcGetGamma(int fd, uint32_t crtc_id, uint32_t size,
+			       uint16_t *red, uint16_t *green, uint16_t *blue);