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 
36 struct drm_fb_offset {
37 	int x, y;
38 };
39 
40 struct drm_fb_helper_crtc {
41 	struct drm_mode_set mode_set;
42 	struct drm_display_mode *desired_mode;
43 	int x, y;
44 };
45 
46 /**
47  * struct drm_fb_helper_surface_size - describes fbdev size and scanout surface size
48  * @fb_width: fbdev width
49  * @fb_height: fbdev height
50  * @surface_width: scanout buffer width
51  * @surface_height: scanout buffer height
52  * @surface_bpp: scanout buffer bpp
53  * @surface_depth: scanout buffer depth
54  *
55  * Note that the scanout surface width/height may be larger than the fbdev
56  * width/height.  In case of multiple displays, the scanout surface is sized
57  * according to the largest width/height (so it is large enough for all CRTCs
58  * to scanout).  But the fbdev width/height is sized to the minimum width/
59  * height of all the displays.  This ensures that fbcon fits on the smallest
60  * of the attached displays.
61  *
62  * So what is passed to drm_fb_helper_fill_var() should be fb_width/fb_height,
63  * rather than the surface size.
64  */
65 struct drm_fb_helper_surface_size {
66 	u32 fb_width;
67 	u32 fb_height;
68 	u32 surface_width;
69 	u32 surface_height;
70 	u32 surface_bpp;
71 	u32 surface_depth;
72 };
73 
74 /**
75  * struct drm_fb_helper_funcs - driver callbacks for the fbdev emulation library
76  * @gamma_set: Set the given gamma lut register on the given crtc.
77  * @gamma_get: Read the given gamma lut register on the given crtc, used to
78  *             save the current lut when force-restoring the fbdev for e.g.
79  *             kdbg.
80  * @fb_probe: Driver callback to allocate and initialize the fbdev info
81  *            structure. Furthermore it also needs to allocate the drm
82  *            framebuffer used to back the fbdev.
83  * @initial_config: Setup an initial fbdev display configuration
84  *
85  * Driver callbacks used by the fbdev emulation helper library.
86  */
87 struct drm_fb_helper_funcs {
88 	void (*gamma_set)(struct drm_crtc *crtc, u16 red, u16 green,
89 			  u16 blue, int regno);
90 	void (*gamma_get)(struct drm_crtc *crtc, u16 *red, u16 *green,
91 			  u16 *blue, int regno);
92 
93 	int (*fb_probe)(struct drm_fb_helper *helper,
94 			struct drm_fb_helper_surface_size *sizes);
95 	bool (*initial_config)(struct drm_fb_helper *fb_helper,
96 			       struct drm_fb_helper_crtc **crtcs,
97 			       struct drm_display_mode **modes,
98 			       struct drm_fb_offset *offsets,
99 			       bool *enabled, int width, int height);
100 };
101 
102 struct drm_fb_helper_connector {
103 	struct drm_connector *connector;
104 };
105 
106 struct drm_fb_helper {
107 	struct drm_framebuffer *fb;
108 	struct drm_device *dev;
109 	int crtc_count;
110 	struct drm_fb_helper_crtc *crtc_info;
111 	int connector_count;
112 	int connector_info_alloc_count;
113 	struct drm_fb_helper_connector **connector_info;
114 	const struct drm_fb_helper_funcs *funcs;
115 	struct fb_info *fbdev;
116 	u32 pseudo_palette[17];
117 	struct list_head kernel_fb_list;
118 
119 	/* we got a hotplug but fbdev wasn't running the console
120 	   delay until next set_par */
121 	bool delayed_hotplug;
122 
123 #ifdef __DragonFly__
124 	struct task fb_mode_task;
125 #endif
126 };
127 
128 void drm_fb_helper_prepare(struct drm_device *dev, struct drm_fb_helper *helper,
129 			   const struct drm_fb_helper_funcs *funcs);
130 int drm_fb_helper_init(struct drm_device *dev,
131 		       struct drm_fb_helper *helper, int crtc_count,
132 		       int max_conn);
133 void drm_fb_helper_fini(struct drm_fb_helper *helper);
134 int drm_fb_helper_blank(int blank, struct fb_info *info);
135 int drm_fb_helper_pan_display(struct fb_var_screeninfo *var,
136 			      struct fb_info *info);
137 int drm_fb_helper_set_par(struct fb_info *info);
138 int drm_fb_helper_check_var(struct fb_var_screeninfo *var,
139 			    struct fb_info *info);
140 
141 bool drm_fb_helper_restore_fbdev_mode_unlocked(struct drm_fb_helper *fb_helper);
142 void drm_fb_helper_fill_var(struct fb_info *info, struct drm_fb_helper *fb_helper,
143 			    uint32_t fb_width, uint32_t fb_height);
144 void drm_fb_helper_fill_fix(struct fb_info *info, uint32_t pitch,
145 			    uint32_t depth);
146 
147 int drm_fb_helper_setcmap(struct fb_cmap *cmap, struct fb_info *info);
148 
149 int drm_fb_helper_hotplug_event(struct drm_fb_helper *fb_helper);
150 int drm_fb_helper_initial_config(struct drm_fb_helper *fb_helper, int bpp_sel);
151 int drm_fb_helper_single_add_all_connectors(struct drm_fb_helper *fb_helper);
152 int drm_fb_helper_debug_enter(struct fb_info *info);
153 int drm_fb_helper_debug_leave(struct fb_info *info);
154 struct drm_display_mode *
155 drm_has_preferred_mode(struct drm_fb_helper_connector *fb_connector,
156 			int width, int height);
157 struct drm_display_mode *
158 drm_pick_cmdline_mode(struct drm_fb_helper_connector *fb_helper_conn,
159 		      int width, int height);
160 
161 int drm_fb_helper_add_one_connector(struct drm_fb_helper *fb_helper, struct drm_connector *connector);
162 int drm_fb_helper_remove_one_connector(struct drm_fb_helper *fb_helper,
163 				       struct drm_connector *connector);
164 #endif
165