kernel/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 /**
 108  * struct drm_fb_helper - helper to emulate fbdev on top of kms
 109  * @fb:  Scanout framebuffer object
 110  * @dev:  DRM device
 111  * @crtc_count: number of possible CRTCs
 112  * @crtc_info: per-CRTC helper state (mode, x/y offset, etc)
 113  * @connector_count: number of connected connectors
 114  * @connector_info_alloc_count: size of connector_info
 115  * @funcs: driver callbacks for fb helper
 116  * @fbdev: emulated fbdev device info struct
 117  * @pseudo_palette: fake palette of 16 colors
 118  * @kernel_fb_list: list_head in kernel_fb_helper_list
 119  * @delayed_hotplug: was there a hotplug while kms master active?
 120  */
 121 struct drm_fb_helper {
 122         struct drm_framebuffer *fb;
 123         struct drm_device *dev;
 124         int crtc_count;
 125         struct drm_fb_helper_crtc *crtc_info;
 126         int connector_count;
 127         int connector_info_alloc_count;
 128         struct drm_fb_helper_connector **connector_info;
 129         const struct drm_fb_helper_funcs *funcs;
 130         struct fb_info *fbdev;
 131         u32 pseudo_palette[17];
 132         struct list_head kernel_fb_list;
 133
 134         /* we got a hotplug but fbdev wasn't running the console
 135            delay until next set_par */
 136         bool delayed_hotplug;
 137
 138         /**
 139          * @atomic:
 140          *
 141          * Use atomic updates for restore_fbdev_mode(), etc.  This defaults to
 142          * true if driver has DRIVER_ATOMIC feature flag, but drivers can
 143          * override it to true after drm_fb_helper_init() if they support atomic
 144          * modeset but do not yet advertise DRIVER_ATOMIC (note that fb-helper
 145          * does not require ASYNC commits).
 146          */
 147         bool atomic;
 148 };
 149
 150 #ifdef CONFIG_DRM_FBDEV_EMULATION
 151 void drm_fb_helper_prepare(struct drm_device *dev, struct drm_fb_helper *helper,
 152                            const struct drm_fb_helper_funcs *funcs);
 153 int drm_fb_helper_init(struct drm_device *dev,
 154                        struct drm_fb_helper *helper, int crtc_count,
 155                        int max_conn);
 156 void drm_fb_helper_fini(struct drm_fb_helper *helper);
 157 int drm_fb_helper_blank(int blank, struct fb_info *info);
 158 int drm_fb_helper_pan_display(struct fb_var_screeninfo *var,
 159                               struct fb_info *info);
 160 int drm_fb_helper_set_par(struct fb_info *info);
 161 int drm_fb_helper_check_var(struct fb_var_screeninfo *var,
 162                             struct fb_info *info);
 163
 164 int drm_fb_helper_restore_fbdev_mode_unlocked(struct drm_fb_helper *fb_helper);
 165
 166 struct fb_info *drm_fb_helper_alloc_fbi(struct drm_fb_helper *fb_helper);
 167 void drm_fb_helper_unregister_fbi(struct drm_fb_helper *fb_helper);
 168 void drm_fb_helper_release_fbi(struct drm_fb_helper *fb_helper);
 169 void drm_fb_helper_fill_var(struct fb_info *info, struct drm_fb_helper *fb_helper,
 170                             uint32_t fb_width, uint32_t fb_height);
 171 void drm_fb_helper_fill_fix(struct fb_info *info, uint32_t pitch,
 172                             uint32_t depth);
 173
 174 void drm_fb_helper_unlink_fbi(struct drm_fb_helper *fb_helper);
 175
 176 ssize_t drm_fb_helper_sys_read(struct fb_info *info, char __user *buf,
 177                                size_t count, loff_t *ppos);
 178 ssize_t drm_fb_helper_sys_write(struct fb_info *info, const char __user *buf,
 179                                 size_t count, loff_t *ppos);
 180
 181 void drm_fb_helper_sys_fillrect(struct fb_info *info,
 182                                 const struct fb_fillrect *rect);
 183 void drm_fb_helper_sys_copyarea(struct fb_info *info,
 184                                 const struct fb_copyarea *area);
 185 void drm_fb_helper_sys_imageblit(struct fb_info *info,
 186                                  const struct fb_image *image);
 187
 188 void drm_fb_helper_cfb_fillrect(struct fb_info *info,
 189                                 const struct fb_fillrect *rect);
 190 void drm_fb_helper_cfb_copyarea(struct fb_info *info,
 191                                 const struct fb_copyarea *area);
 192 void drm_fb_helper_cfb_imageblit(struct fb_info *info,
 193                                  const struct fb_image *image);
 194
 195 void drm_fb_helper_set_suspend(struct drm_fb_helper *fb_helper, int state);
 196
 197 int drm_fb_helper_setcmap(struct fb_cmap *cmap, struct fb_info *info);
 198
 199 int drm_fb_helper_hotplug_event(struct drm_fb_helper *fb_helper);
 200 int drm_fb_helper_initial_config(struct drm_fb_helper *fb_helper, int bpp_sel);
 201 int drm_fb_helper_single_add_all_connectors(struct drm_fb_helper *fb_helper);
 202 int drm_fb_helper_debug_enter(struct fb_info *info);
 203 int drm_fb_helper_debug_leave(struct fb_info *info);
 204 struct drm_display_mode *
 205 drm_has_preferred_mode(struct drm_fb_helper_connector *fb_connector,
 206                         int width, int height);
 207 struct drm_display_mode *
 208 drm_pick_cmdline_mode(struct drm_fb_helper_connector *fb_helper_conn,
 209                       int width, int height);
 210
 211 int drm_fb_helper_add_one_connector(struct drm_fb_helper *fb_helper, struct drm_connector *connector);
 212 int drm_fb_helper_remove_one_connector(struct drm_fb_helper *fb_helper,
 213                                        struct drm_connector *connector);
 214 #else
 215 static inline void drm_fb_helper_prepare(struct drm_device *dev,
 216                                         struct drm_fb_helper *helper,
 217                                         const struct drm_fb_helper_funcs *funcs)
 218 {
 219 }
 220
 221 static inline int drm_fb_helper_init(struct drm_device *dev,
 222                        struct drm_fb_helper *helper, int crtc_count,
 223                        int max_conn)
 224 {
 225         return 0;
 226 }
 227
 228 static inline void drm_fb_helper_fini(struct drm_fb_helper *helper)
 229 {
 230 }
 231
 232 static inline int drm_fb_helper_blank(int blank, struct fb_info *info)
 233 {
 234         return 0;
 235 }
 236
 237 static inline int drm_fb_helper_pan_display(struct fb_var_screeninfo *var,
 238                                             struct fb_info *info)
 239 {
 240         return 0;
 241 }
 242
 243 static inline int drm_fb_helper_set_par(struct fb_info *info)
 244 {
 245         return 0;
 246 }
 247
 248 static inline int drm_fb_helper_check_var(struct fb_var_screeninfo *var,
 249                                           struct fb_info *info)
 250 {
 251         return 0;
 252 }
 253
 254 static inline int
 255 drm_fb_helper_restore_fbdev_mode_unlocked(struct drm_fb_helper *fb_helper)
 256 {
 257         return 0;
 258 }
 259
 260 static inline struct fb_info *
 261 drm_fb_helper_alloc_fbi(struct drm_fb_helper *fb_helper)
 262 {
 263         return NULL;
 264 }
 265
 266 static inline void drm_fb_helper_unregister_fbi(struct drm_fb_helper *fb_helper)
 267 {
 268 }
 269 static inline void drm_fb_helper_release_fbi(struct drm_fb_helper *fb_helper)
 270 {
 271 }
 272
 273 static inline void drm_fb_helper_fill_var(struct fb_info *info,
 274                                           struct drm_fb_helper *fb_helper,
 275                                           uint32_t fb_width, uint32_t fb_height)
 276 {
 277 }
 278
 279 static inline void drm_fb_helper_fill_fix(struct fb_info *info, uint32_t pitch,
 280                                           uint32_t depth)
 281 {
 282 }
 283
 284 static inline int drm_fb_helper_setcmap(struct fb_cmap *cmap,
 285                                         struct fb_info *info)
 286 {
 287         return 0;
 288 }
 289
 290 static inline void drm_fb_helper_unlink_fbi(struct drm_fb_helper *fb_helper)
 291 {
 292 }
 293
 294 static inline ssize_t drm_fb_helper_sys_read(struct fb_info *info,
 295                                              char __user *buf, size_t count,
 296                                              loff_t *ppos)
 297 {
 298         return -ENODEV;
 299 }
 300
 301 static inline ssize_t drm_fb_helper_sys_write(struct fb_info *info,
 302                                               const char __user *buf,
 303                                               size_t count, loff_t *ppos)
 304 {
 305         return -ENODEV;
 306 }
 307
 308 static inline void drm_fb_helper_sys_fillrect(struct fb_info *info,
 309                                               const struct fb_fillrect *rect)
 310 {
 311 }
 312
 313 static inline void drm_fb_helper_sys_copyarea(struct fb_info *info,
 314                                               const struct fb_copyarea *area)
 315 {
 316 }
 317
 318 static inline void drm_fb_helper_sys_imageblit(struct fb_info *info,
 319                                                const struct fb_image *image)
 320 {
 321 }
 322
 323 static inline void drm_fb_helper_cfb_fillrect(struct fb_info *info,
 324                                               const struct fb_fillrect *rect)
 325 {
 326 }
 327
 328 static inline void drm_fb_helper_cfb_copyarea(struct fb_info *info,
 329                                               const struct fb_copyarea *area)
 330 {
 331 }
 332
 333 static inline void drm_fb_helper_cfb_imageblit(struct fb_info *info,
 334                                                const struct fb_image *image)
 335 {
 336 }
 337
 338 static inline void drm_fb_helper_set_suspend(struct drm_fb_helper *fb_helper,
 339                                              int state)
 340 {
 341 }
 342
 343 static inline int drm_fb_helper_hotplug_event(struct drm_fb_helper *fb_helper)
 344 {
 345         return 0;
 346 }
 347
 348 static inline int drm_fb_helper_initial_config(struct drm_fb_helper *fb_helper,
 349                                                int bpp_sel)
 350 {
 351         return 0;
 352 }
 353
 354 static inline int
 355 drm_fb_helper_single_add_all_connectors(struct drm_fb_helper *fb_helper)
 356 {
 357         return 0;
 358 }
 359
 360 static inline int drm_fb_helper_debug_enter(struct fb_info *info)
 361 {
 362         return 0;
 363 }
 364
 365 static inline int drm_fb_helper_debug_leave(struct fb_info *info)
 366 {
 367         return 0;
 368 }
 369
 370 static inline struct drm_display_mode *
 371 drm_has_preferred_mode(struct drm_fb_helper_connector *fb_connector,
 372                        int width, int height)
 373 {
 374         return NULL;
 375 }
 376
 377 static inline struct drm_display_mode *
 378 drm_pick_cmdline_mode(struct drm_fb_helper_connector *fb_helper_conn,
 379                       int width, int height)
 380 {
 381         return NULL;
 382 }
 383
 384 static inline int
 385 drm_fb_helper_add_one_connector(struct drm_fb_helper *fb_helper,
 386                                 struct drm_connector *connector)
 387 {
 388         return 0;
 389 }
 390
 391 static inline int
 392 drm_fb_helper_remove_one_connector(struct drm_fb_helper *fb_helper,
 393                                    struct drm_connector *connector)
 394 {
 395         return 0;
 396 }
 397 #endif
 398 #endif