include/drm/drm_fb_helper.h

   1 /*
   2  * Copyright (c) 2006-2009 Red Hat Inc.
   3  * Copyright (c) 2006-2008 Intel Corporation
   4  * Copyright (c) 2007 Dave Airlie <airlied@linux.ie>
   5  *
   6  * DRM framebuffer helper functions
   7  *
   8  * Permission to use, copy, modify, distribute, and sell this software and its
   9  * documentation for any purpose is hereby granted without fee, provided that
  10  * the above copyright notice appear in all copies and that both that copyright
  11  * notice and this permission notice appear in supporting documentation, and
  12  * that the name of the copyright holders not be used in advertising or
  13  * publicity pertaining to distribution of the software without specific,
  14  * written prior permission.  The copyright holders make no representations
  15  * about the suitability of this software for any purpose.  It is provided "as
  16  * is" without express or implied warranty.
  17  *
  18  * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
  19  * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
  20  * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
  21  * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
  22  * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
  23  * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
  24  * OF THIS SOFTWARE.
  25  *
  26  * Authors:
  27  *      Dave Airlie <airlied@linux.ie>
  28  *      Jesse Barnes <jesse.barnes@intel.com>
  29  */
  30 #ifndef DRM_FB_HELPER_H
  31 #define DRM_FB_HELPER_H
  32
  33 struct drm_fb_helper;
  34
  35 #include <linux/kgdb.h>
  36
  37 struct drm_fb_offset {
  38         int x, y;
  39 };
  40
  41 struct drm_fb_helper_crtc {
  42         struct drm_mode_set mode_set;
  43         struct drm_display_mode *desired_mode;
  44         int x, y;
  45 };
  46
  47 /**
  48  * struct drm_fb_helper_surface_size - describes fbdev size and scanout surface size
  49  * @fb_width: fbdev width
  50  * @fb_height: fbdev height
  51  * @surface_width: scanout buffer width
  52  * @surface_height: scanout buffer height
  53  * @surface_bpp: scanout buffer bpp
  54  * @surface_depth: scanout buffer depth
  55  *
  56  * Note that the scanout surface width/height may be larger than the fbdev
  57  * width/height.  In case of multiple displays, the scanout surface is sized
  58  * according to the largest width/height (so it is large enough for all CRTCs
  59  * to scanout).  But the fbdev width/height is sized to the minimum width/
  60  * height of all the displays.  This ensures that fbcon fits on the smallest
  61  * of the attached displays.
  62  *
  63  * So what is passed to drm_fb_helper_fill_var() should be fb_width/fb_height,
  64  * rather than the surface size.
  65  */
  66 struct drm_fb_helper_surface_size {
  67         u32 fb_width;
  68         u32 fb_height;
  69         u32 surface_width;
  70         u32 surface_height;
  71         u32 surface_bpp;
  72         u32 surface_depth;
  73 };
  74
  75 /**
  76  * struct drm_fb_helper_funcs - driver callbacks for the fbdev emulation library
  77  * @gamma_set: Set the given gamma lut register on the given crtc.
  78  * @gamma_get: Read the given gamma lut register on the given crtc, used to
  79  *             save the current lut when force-restoring the fbdev for e.g.
  80  *             kdbg.
  81  * @fb_probe: Driver callback to allocate and initialize the fbdev info
  82  *            structure. Furthermore it also needs to allocate the drm
  83  *            framebuffer used to back the fbdev.
  84  * @initial_config: Setup an initial fbdev display configuration
  85  *
  86  * Driver callbacks used by the fbdev emulation helper library.
  87  */
  88 struct drm_fb_helper_funcs {
  89         void (*gamma_set)(struct drm_crtc *crtc, u16 red, u16 green,
  90                           u16 blue, int regno);
  91         void (*gamma_get)(struct drm_crtc *crtc, u16 *red, u16 *green,
  92                           u16 *blue, int regno);
  93
  94         int (*fb_probe)(struct drm_fb_helper *helper,
  95                         struct drm_fb_helper_surface_size *sizes);
  96         bool (*initial_config)(struct drm_fb_helper *fb_helper,
  97                                struct drm_fb_helper_crtc **crtcs,
  98                                struct drm_display_mode **modes,
  99                                struct drm_fb_offset *offsets,
 100                                bool *enabled, int width, int height);
 101 };
 102
 103 struct drm_fb_helper_connector {
 104         struct drm_connector *connector;
 105 };
 106
 107 struct drm_fb_helper {
 108         struct drm_framebuffer *fb;
 109         struct drm_device *dev;
 110         int crtc_count;
 111         struct drm_fb_helper_crtc *crtc_info;
 112         int connector_count;
 113         int connector_info_alloc_count;
 114         struct drm_fb_helper_connector **connector_info;
 115         const struct drm_fb_helper_funcs *funcs;
 116         struct fb_info *fbdev;
 117         u32 pseudo_palette[17];
 118         struct list_head kernel_fb_list;
 119
 120         /* we got a hotplug but fbdev wasn't running the console
 121            delay until next set_par */
 122         bool delayed_hotplug;
 123 };
 124
 125 void drm_fb_helper_prepare(struct drm_device *dev, struct drm_fb_helper *helper,
 126                            const struct drm_fb_helper_funcs *funcs);
 127 int drm_fb_helper_init(struct drm_device *dev,
 128                        struct drm_fb_helper *helper, int crtc_count,
 129                        int max_conn);
 130 void drm_fb_helper_fini(struct drm_fb_helper *helper);
 131 int drm_fb_helper_blank(int blank, struct fb_info *info);
 132 int drm_fb_helper_pan_display(struct fb_var_screeninfo *var,
 133                               struct fb_info *info);
 134 int drm_fb_helper_set_par(struct fb_info *info);
 135 int drm_fb_helper_check_var(struct fb_var_screeninfo *var,
 136                             struct fb_info *info);
 137
 138 bool drm_fb_helper_restore_fbdev_mode_unlocked(struct drm_fb_helper *fb_helper);
 139 void drm_fb_helper_fill_var(struct fb_info *info, struct drm_fb_helper *fb_helper,
 140                             uint32_t fb_width, uint32_t fb_height);
 141 void drm_fb_helper_fill_fix(struct fb_info *info, uint32_t pitch,
 142                             uint32_t depth);
 143
 144 int drm_fb_helper_setcmap(struct fb_cmap *cmap, struct fb_info *info);
 145
 146 int drm_fb_helper_hotplug_event(struct drm_fb_helper *fb_helper);
 147 int drm_fb_helper_initial_config(struct drm_fb_helper *fb_helper, int bpp_sel);
 148 int drm_fb_helper_single_add_all_connectors(struct drm_fb_helper *fb_helper);
 149 int drm_fb_helper_debug_enter(struct fb_info *info);
 150 int drm_fb_helper_debug_leave(struct fb_info *info);
 151 struct drm_display_mode *
 152 drm_has_preferred_mode(struct drm_fb_helper_connector *fb_connector,
 153                         int width, int height);
 154 struct drm_display_mode *
 155 drm_pick_cmdline_mode(struct drm_fb_helper_connector *fb_helper_conn,
 156                       int width, int height);
 157
 158 int drm_fb_helper_add_one_connector(struct drm_fb_helper *fb_helper, struct drm_connector *connector);
 159 int drm_fb_helper_remove_one_connector(struct drm_fb_helper *fb_helper,
 160                                        struct drm_connector *connector);
 161 #endif