---
name: "struct_drm_fb_helper_funcs"
section: "9"
platform: "linux"
package: "linux-manual-3.16"
version: "3.16.56-1+deb8u1"
release: "Debian 8 (Jessie)"
platforms: ["linux"]
url: "https://new.carta.tech/struct_drm_fb_helper_funcs"
---

# struct\_drm\_fb\_helper\_funcs(9)

driver callbacks for the fbdev emulation library

## NAME

struct\_drm\_fb\_helper\_funcs - driver callbacks for the fbdev emulation library

## SYNOPSIS

```
struct drm_fb_helper_funcs {
  void (* gamma_set) (struct drm_crtc *crtc, u16 red, u16 green,u16 blue, int regno);
  void (* gamma_get) (struct drm_crtc *crtc, u16 *red, u16 *green,u16 *blue, int regno);
  int (* fb_probe) (struct drm_fb_helper *helper,struct drm_fb_helper_surface_size *sizes);
  bool (* initial_config) (struct drm_fb_helper *fb_helper,struct drm_fb_helper_crtc **crtcs,struct drm_display_mode **modes,bool *enabled, int width, int height);
};
```

## MEMBERS

gamma\_set

Set the given gamma lut register on the given crtc.

gamma\_get

Read the given gamma lut register on the given crtc, used to save the current lut when force-restoring the fbdev for e.g. kdbg.

fb\_probe

Driver callback to allocate and initialize the fbdev info structure. Furthermore it also needs to allocate the drm framebuffer used to back the fbdev.

initial\_config

Setup an initial fbdev display configuration

## DESCRIPTION

Driver callbacks used by the fbdev emulation helper library.

## AUTHORS

**Jesse Barnes** \<jesse.barnes@intel.com\>\
 Intel Corporation,

Initial version

**Laurent Pinchart** \<laurent.pinchart@ideasonboard.com\>\
 Ideas on board SPRL,

Driver internals

**Daniel Vetter** \<daniel.vetter@ffwll.ch\>\
 Intel Corporation,

Contributions all over the place

## COPYRIGHT