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 enum mode_set_atomic {
  38         LEAVE_ATOMIC_MODE_SET,
  39         ENTER_ATOMIC_MODE_SET,
  40 };
  41
  42 struct drm_fb_offset {
  43         int x, y;
  44 };
  45
  46 struct drm_fb_helper_crtc {
  47         struct drm_mode_set mode_set;
  48         struct drm_display_mode *desired_mode;
  49         int x, y;
  50 };
  51
  52 /**
  53  * struct drm_fb_helper_surface_size - describes fbdev size and scanout surface size
  54  * @fb_width: fbdev width
  55  * @fb_height: fbdev height
  56  * @surface_width: scanout buffer width
  57  * @surface_height: scanout buffer height
  58  * @surface_bpp: scanout buffer bpp
  59  * @surface_depth: scanout buffer depth
  60  *
  61  * Note that the scanout surface width/height may be larger than the fbdev
  62  * width/height.  In case of multiple displays, the scanout surface is sized
  63  * according to the largest width/height (so it is large enough for all CRTCs
  64  * to scanout).  But the fbdev width/height is sized to the minimum width/
  65  * height of all the displays.  This ensures that fbcon fits on the smallest
  66  * of the attached displays.
  67  *
  68  * So what is passed to drm_fb_helper_fill_var() should be fb_width/fb_height,
  69  * rather than the surface size.
  70  */
  71 struct drm_fb_helper_surface_size {
  72         u32 fb_width;
  73         u32 fb_height;
  74         u32 surface_width;
  75         u32 surface_height;
  76         u32 surface_bpp;
  77         u32 surface_depth;
  78 };
  79
  80 /**
  81  * struct drm_fb_helper_funcs - driver callbacks for the fbdev emulation library
  82  *
  83  * Driver callbacks used by the fbdev emulation helper library.
  84  */
  85 struct drm_fb_helper_funcs {
  86         /**
  87          * @gamma_set:
  88          *
  89          * Set the given gamma LUT register on the given CRTC.
  90          *
  91          * This callback is optional.
  92          *
  93          * FIXME:
  94          *
  95          * This callback is functionally redundant with the core gamma table
  96          * support and simply exists because the fbdev hasn't yet been
  97          * refactored to use the core gamma table interfaces.
  98          */
  99         void (*gamma_set)(struct drm_crtc *crtc, u16 red, u16 green,
 100                           u16 blue, int regno);
 101         /**
 102          * @gamma_get:
 103          *
 104          * Read the given gamma LUT register on the given CRTC, used to save the
 105          * current LUT when force-restoring the fbdev for e.g. kdbg.
 106          *
 107          * This callback is optional.
 108          *
 109          * FIXME:
 110          *
 111          * This callback is functionally redundant with the core gamma table
 112          * support and simply exists because the fbdev hasn't yet been
 113          * refactored to use the core gamma table interfaces.
 114          */
 115         void (*gamma_get)(struct drm_crtc *crtc, u16 *red, u16 *green,
 116                           u16 *blue, int regno);
 117
 118         /**
 119          * @fb_probe:
 120          *
 121          * Driver callback to allocate and initialize the fbdev info structure.
 122          * Furthermore it also needs to allocate the DRM framebuffer used to
 123          * back the fbdev.
 124          *
 125          * This callback is mandatory.
 126          *
 127          * RETURNS:
 128          *
 129          * The driver should return 0 on success and a negative error code on
 130          * failure.
 131          */
 132         int (*fb_probe)(struct drm_fb_helper *helper,
 133                         struct drm_fb_helper_surface_size *sizes);
 134
 135         /**
 136          * @initial_config:
 137          *
 138          * Driver callback to setup an initial fbdev display configuration.
 139          * Drivers can use this callback to tell the fbdev emulation what the
 140          * preferred initial configuration is. This is useful to implement
 141          * smooth booting where the fbdev (and subsequently all userspace) never
 142          * changes the mode, but always inherits the existing configuration.
 143          *
 144          * This callback is optional.
 145          *
 146          * RETURNS:
 147          *
 148          * The driver should return true if a suitable initial configuration has
 149          * been filled out and false when the fbdev helper should fall back to
 150          * the default probing logic.
 151          */
 152         bool (*initial_config)(struct drm_fb_helper *fb_helper,
 153                                struct drm_fb_helper_crtc **crtcs,
 154                                struct drm_display_mode **modes,
 155                                struct drm_fb_offset *offsets,
 156                                bool *enabled, int width, int height);
 157 };
 158
 159 struct drm_fb_helper_connector {
 160         struct drm_connector *connector;
 161 };
 162
 163 /**
 164  * struct drm_fb_helper - main structure to emulate fbdev on top of KMS
 165  * @fb: Scanout framebuffer object
 166  * @dev: DRM device
 167  * @crtc_count: number of possible CRTCs
 168  * @crtc_info: per-CRTC helper state (mode, x/y offset, etc)
 169  * @connector_count: number of connected connectors
 170  * @connector_info_alloc_count: size of connector_info
 171  * @connector_info: array of per-connector information
 172  * @funcs: driver callbacks for fb helper
 173  * @fbdev: emulated fbdev device info struct
 174  * @pseudo_palette: fake palette of 16 colors
 175  * @dirty_clip: clip rectangle used with deferred_io to accumulate damage to
 176  *              the screen buffer
 177  * @dirty_lock: spinlock protecting @dirty_clip
 178  * @dirty_work: worker used to flush the framebuffer
 179  *
 180  * This is the main structure used by the fbdev helpers. Drivers supporting
 181  * fbdev emulation should embedded this into their overall driver structure.
 182  * Drivers must also fill out a struct &drm_fb_helper_funcs with a few
 183  * operations.
 184  */
 185 struct drm_fb_helper {
 186         struct drm_framebuffer *fb;
 187         struct drm_device *dev;
 188         int crtc_count;
 189         struct drm_fb_helper_crtc *crtc_info;
 190         int connector_count;
 191         int connector_info_alloc_count;
 192         struct drm_fb_helper_connector **connector_info;
 193         const struct drm_fb_helper_funcs *funcs;
 194         struct fb_info *fbdev;
 195         u32 pseudo_palette[17];
 196         struct drm_clip_rect dirty_clip;
 197         spinlock_t dirty_lock;
 198         struct work_struct dirty_work;
 199
 200         /**
 201          * @kernel_fb_list:
 202          *
 203          * Entry on the global kernel_fb_helper_list, used for kgdb entry/exit.
 204          */
 205         struct list_head kernel_fb_list;
 206
 207         /**
 208          * @delayed_hotplug:
 209          *
 210          * A hotplug was received while fbdev wasn't in control of the DRM
 211          * device, i.e. another KMS master was active. The output configuration
 212          * needs to be reprobe when fbdev is in control again.
 213          */
 214         bool delayed_hotplug;
 215
 216         /**
 217          * @atomic:
 218          *
 219          * Use atomic updates for restore_fbdev_mode(), etc.  This defaults to
 220          * true if driver has DRIVER_ATOMIC feature flag, but drivers can
 221          * override it to true after drm_fb_helper_init() if they support atomic
 222          * modeset but do not yet advertise DRIVER_ATOMIC (note that fb-helper
 223          * does not require ASYNC commits).
 224          */
 225         bool atomic;
 226 };
 227
 228 #ifdef CONFIG_DRM_FBDEV_EMULATION
 229 int drm_fb_helper_modinit(void);
 230 void drm_fb_helper_prepare(struct drm_device *dev, struct drm_fb_helper *helper,
 231                            const struct drm_fb_helper_funcs *funcs);
 232 int drm_fb_helper_init(struct drm_device *dev,
 233                        struct drm_fb_helper *helper, int crtc_count,
 234                        int max_conn);
 235 void drm_fb_helper_fini(struct drm_fb_helper *helper);
 236 int drm_fb_helper_blank(int blank, struct fb_info *info);
 237 int drm_fb_helper_pan_display(struct fb_var_screeninfo *var,
 238                               struct fb_info *info);
 239 int drm_fb_helper_set_par(struct fb_info *info);
 240 int drm_fb_helper_check_var(struct fb_var_screeninfo *var,
 241                             struct fb_info *info);
 242
 243 int drm_fb_helper_restore_fbdev_mode_unlocked(struct drm_fb_helper *fb_helper);
 244
 245 struct fb_info *drm_fb_helper_alloc_fbi(struct drm_fb_helper *fb_helper);
 246 void drm_fb_helper_unregister_fbi(struct drm_fb_helper *fb_helper);
 247 void drm_fb_helper_release_fbi(struct drm_fb_helper *fb_helper);
 248 void drm_fb_helper_fill_var(struct fb_info *info, struct drm_fb_helper *fb_helper,
 249                             uint32_t fb_width, uint32_t fb_height);
 250 void drm_fb_helper_fill_fix(struct fb_info *info, uint32_t pitch,
 251                             uint32_t depth);
 252
 253 void drm_fb_helper_unlink_fbi(struct drm_fb_helper *fb_helper);
 254
 255 void drm_fb_helper_deferred_io(struct fb_info *info,
 256                                struct list_head *pagelist);
 257
 258 ssize_t drm_fb_helper_sys_read(struct fb_info *info, char __user *buf,
 259                                size_t count, loff_t *ppos);
 260 ssize_t drm_fb_helper_sys_write(struct fb_info *info, const char __user *buf,
 261                                 size_t count, loff_t *ppos);
 262
 263 void drm_fb_helper_sys_fillrect(struct fb_info *info,
 264                                 const struct fb_fillrect *rect);
 265 void drm_fb_helper_sys_copyarea(struct fb_info *info,
 266                                 const struct fb_copyarea *area);
 267 void drm_fb_helper_sys_imageblit(struct fb_info *info,
 268                                  const struct fb_image *image);
 269
 270 void drm_fb_helper_cfb_fillrect(struct fb_info *info,
 271                                 const struct fb_fillrect *rect);
 272 void drm_fb_helper_cfb_copyarea(struct fb_info *info,
 273                                 const struct fb_copyarea *area);
 274 void drm_fb_helper_cfb_imageblit(struct fb_info *info,
 275                                  const struct fb_image *image);
 276
 277 void drm_fb_helper_set_suspend(struct drm_fb_helper *fb_helper, int state);
 278
 279 int drm_fb_helper_setcmap(struct fb_cmap *cmap, struct fb_info *info);
 280
 281 int drm_fb_helper_hotplug_event(struct drm_fb_helper *fb_helper);
 282 int drm_fb_helper_initial_config(struct drm_fb_helper *fb_helper, int bpp_sel);
 283 int drm_fb_helper_single_add_all_connectors(struct drm_fb_helper *fb_helper);
 284 int drm_fb_helper_debug_enter(struct fb_info *info);
 285 int drm_fb_helper_debug_leave(struct fb_info *info);
 286 struct drm_display_mode *
 287 drm_has_preferred_mode(struct drm_fb_helper_connector *fb_connector,
 288                         int width, int height);
 289 struct drm_display_mode *
 290 drm_pick_cmdline_mode(struct drm_fb_helper_connector *fb_helper_conn,
 291                       int width, int height);
 292
 293 int drm_fb_helper_add_one_connector(struct drm_fb_helper *fb_helper, struct drm_connector *connector);
 294 int drm_fb_helper_remove_one_connector(struct drm_fb_helper *fb_helper,
 295                                        struct drm_connector *connector);
 296 #else
 297 static inline int drm_fb_helper_modinit(void)
 298 {
 299         return 0;
 300 }
 301
 302 static inline void drm_fb_helper_prepare(struct drm_device *dev,
 303                                         struct drm_fb_helper *helper,
 304                                         const struct drm_fb_helper_funcs *funcs)
 305 {
 306 }
 307
 308 static inline int drm_fb_helper_init(struct drm_device *dev,
 309                        struct drm_fb_helper *helper, int crtc_count,
 310                        int max_conn)
 311 {
 312         return 0;
 313 }
 314
 315 static inline void drm_fb_helper_fini(struct drm_fb_helper *helper)
 316 {
 317 }
 318
 319 static inline int drm_fb_helper_blank(int blank, struct fb_info *info)
 320 {
 321         return 0;
 322 }
 323
 324 static inline int drm_fb_helper_pan_display(struct fb_var_screeninfo *var,
 325                                             struct fb_info *info)
 326 {
 327         return 0;
 328 }
 329
 330 static inline int drm_fb_helper_set_par(struct fb_info *info)
 331 {
 332         return 0;
 333 }
 334
 335 static inline int drm_fb_helper_check_var(struct fb_var_screeninfo *var,
 336                                           struct fb_info *info)
 337 {
 338         return 0;
 339 }
 340
 341 static inline int
 342 drm_fb_helper_restore_fbdev_mode_unlocked(struct drm_fb_helper *fb_helper)
 343 {
 344         return 0;
 345 }
 346
 347 static inline struct fb_info *
 348 drm_fb_helper_alloc_fbi(struct drm_fb_helper *fb_helper)
 349 {
 350         return NULL;
 351 }
 352
 353 static inline void drm_fb_helper_unregister_fbi(struct drm_fb_helper *fb_helper)
 354 {
 355 }
 356 static inline void drm_fb_helper_release_fbi(struct drm_fb_helper *fb_helper)
 357 {
 358 }
 359
 360 static inline void drm_fb_helper_fill_var(struct fb_info *info,
 361                                           struct drm_fb_helper *fb_helper,
 362                                           uint32_t fb_width, uint32_t fb_height)
 363 {
 364 }
 365
 366 static inline void drm_fb_helper_fill_fix(struct fb_info *info, uint32_t pitch,
 367                                           uint32_t depth)
 368 {
 369 }
 370
 371 static inline int drm_fb_helper_setcmap(struct fb_cmap *cmap,
 372                                         struct fb_info *info)
 373 {
 374         return 0;
 375 }
 376
 377 static inline void drm_fb_helper_unlink_fbi(struct drm_fb_helper *fb_helper)
 378 {
 379 }
 380
 381 static inline void drm_fb_helper_deferred_io(struct fb_info *info,
 382                                              struct list_head *pagelist)
 383 {
 384 }
 385
 386 static inline ssize_t drm_fb_helper_sys_read(struct fb_info *info,
 387                                              char __user *buf, size_t count,
 388                                              loff_t *ppos)
 389 {
 390         return -ENODEV;
 391 }
 392
 393 static inline ssize_t drm_fb_helper_sys_write(struct fb_info *info,
 394                                               const char __user *buf,
 395                                               size_t count, loff_t *ppos)
 396 {
 397         return -ENODEV;
 398 }
 399
 400 static inline void drm_fb_helper_sys_fillrect(struct fb_info *info,
 401                                               const struct fb_fillrect *rect)
 402 {
 403 }
 404
 405 static inline void drm_fb_helper_sys_copyarea(struct fb_info *info,
 406                                               const struct fb_copyarea *area)
 407 {
 408 }
 409
 410 static inline void drm_fb_helper_sys_imageblit(struct fb_info *info,
 411                                                const struct fb_image *image)
 412 {
 413 }
 414
 415 static inline void drm_fb_helper_cfb_fillrect(struct fb_info *info,
 416                                               const struct fb_fillrect *rect)
 417 {
 418 }
 419
 420 static inline void drm_fb_helper_cfb_copyarea(struct fb_info *info,
 421                                               const struct fb_copyarea *area)
 422 {
 423 }
 424
 425 static inline void drm_fb_helper_cfb_imageblit(struct fb_info *info,
 426                                                const struct fb_image *image)
 427 {
 428 }
 429
 430 static inline void drm_fb_helper_set_suspend(struct drm_fb_helper *fb_helper,
 431                                              int state)
 432 {
 433 }
 434
 435 static inline int drm_fb_helper_hotplug_event(struct drm_fb_helper *fb_helper)
 436 {
 437         return 0;
 438 }
 439
 440 static inline int drm_fb_helper_initial_config(struct drm_fb_helper *fb_helper,
 441                                                int bpp_sel)
 442 {
 443         return 0;
 444 }
 445
 446 static inline int
 447 drm_fb_helper_single_add_all_connectors(struct drm_fb_helper *fb_helper)
 448 {
 449         return 0;
 450 }
 451
 452 static inline int drm_fb_helper_debug_enter(struct fb_info *info)
 453 {
 454         return 0;
 455 }
 456
 457 static inline int drm_fb_helper_debug_leave(struct fb_info *info)
 458 {
 459         return 0;
 460 }
 461
 462 static inline struct drm_display_mode *
 463 drm_has_preferred_mode(struct drm_fb_helper_connector *fb_connector,
 464                        int width, int height)
 465 {
 466         return NULL;
 467 }
 468
 469 static inline struct drm_display_mode *
 470 drm_pick_cmdline_mode(struct drm_fb_helper_connector *fb_helper_conn,
 471                       int width, int height)
 472 {
 473         return NULL;
 474 }
 475
 476 static inline int
 477 drm_fb_helper_add_one_connector(struct drm_fb_helper *fb_helper,
 478                                 struct drm_connector *connector)
 479 {
 480         return 0;
 481 }
 482
 483 static inline int
 484 drm_fb_helper_remove_one_connector(struct drm_fb_helper *fb_helper,
 485                                    struct drm_connector *connector)
 486 {
 487         return 0;
 488 }
 489 #endif
 490 #endif