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_clip_rect; 34 struct drm_fb_helper; 35 36 #include <linux/fb.h> 37 38 #include <drm/drm_client.h> 39 40 /** 41 * struct drm_fb_helper_surface_size - describes fbdev size and scanout surface size 42 * @fb_width: fbdev width 43 * @fb_height: fbdev height 44 * @surface_width: scanout buffer width 45 * @surface_height: scanout buffer height 46 * @surface_bpp: scanout buffer bpp 47 * @surface_depth: scanout buffer depth 48 * 49 * Note that the scanout surface width/height may be larger than the fbdev 50 * width/height. In case of multiple displays, the scanout surface is sized 51 * according to the largest width/height (so it is large enough for all CRTCs 52 * to scanout). But the fbdev width/height is sized to the minimum width/ 53 * height of all the displays. This ensures that fbcon fits on the smallest 54 * of the attached displays. fb_width/fb_height is used by 55 * drm_fb_helper_fill_info() to fill out the &fb_info.var structure. 56 */ 57 struct drm_fb_helper_surface_size { 58 u32 fb_width; 59 u32 fb_height; 60 u32 surface_width; 61 u32 surface_height; 62 u32 surface_bpp; 63 u32 surface_depth; 64 }; 65 66 /** 67 * struct drm_fb_helper_funcs - driver callbacks for the fbdev emulation library 68 * 69 * Driver callbacks used by the fbdev emulation helper library. 70 */ 71 struct drm_fb_helper_funcs { 72 /** 73 * @fb_probe: 74 * 75 * Driver callback to allocate and initialize the fbdev info structure. 76 * Furthermore it also needs to allocate the DRM framebuffer used to 77 * back the fbdev. 78 * 79 * This callback is mandatory. 80 * 81 * RETURNS: 82 * 83 * The driver should return 0 on success and a negative error code on 84 * failure. 85 */ 86 int (*fb_probe)(struct drm_fb_helper *helper, 87 struct drm_fb_helper_surface_size *sizes); 88 89 /** 90 * @fb_dirty: 91 * 92 * Driver callback to update the framebuffer memory. If set, fbdev 93 * emulation will invoke this callback in regular intervals after 94 * the framebuffer has been written. 95 * 96 * This callback is optional. 97 * 98 * Returns: 99 * 0 on success, or an error code otherwise. 100 */ 101 int (*fb_dirty)(struct drm_fb_helper *helper, struct drm_clip_rect *clip); 102 }; 103 104 /** 105 * struct drm_fb_helper - main structure to emulate fbdev on top of KMS 106 * @fb: Scanout framebuffer object 107 * @dev: DRM device 108 * @funcs: driver callbacks for fb helper 109 * @info: emulated fbdev device info struct 110 * @pseudo_palette: fake palette of 16 colors 111 * @damage_clip: clip rectangle used with deferred_io to accumulate damage to 112 * the screen buffer 113 * @damage_lock: spinlock protecting @damage_clip 114 * @damage_work: worker used to flush the framebuffer 115 * @resume_work: worker used during resume if the console lock is already taken 116 * 117 * This is the main structure used by the fbdev helpers. Drivers supporting 118 * fbdev emulation should embedded this into their overall driver structure. 119 * Drivers must also fill out a &struct drm_fb_helper_funcs with a few 120 * operations. 121 */ 122 struct drm_fb_helper { 123 /** 124 * @client: 125 * 126 * DRM client used by the generic fbdev emulation. 127 */ 128 struct drm_client_dev client; 129 130 /** 131 * @buffer: 132 * 133 * Framebuffer used by the generic fbdev emulation. 134 */ 135 struct drm_client_buffer *buffer; 136 137 struct drm_framebuffer *fb; 138 struct drm_device *dev; 139 const struct drm_fb_helper_funcs *funcs; 140 struct fb_info *info; 141 u32 pseudo_palette[17]; 142 struct drm_clip_rect damage_clip; 143 spinlock_t damage_lock; 144 struct work_struct damage_work; 145 struct work_struct resume_work; 146 147 /** 148 * @lock: 149 * 150 * Top-level FBDEV helper lock. This protects all internal data 151 * structures and lists, such as @connector_info and @crtc_info. 152 * 153 * FIXME: fbdev emulation locking is a mess and long term we want to 154 * protect all helper internal state with this lock as well as reduce 155 * core KMS locking as much as possible. 156 */ 157 struct mutex lock; 158 159 /** 160 * @kernel_fb_list: 161 * 162 * Entry on the global kernel_fb_helper_list, used for kgdb entry/exit. 163 */ 164 struct list_head kernel_fb_list; 165 166 /** 167 * @delayed_hotplug: 168 * 169 * A hotplug was received while fbdev wasn't in control of the DRM 170 * device, i.e. another KMS master was active. The output configuration 171 * needs to be reprobe when fbdev is in control again. 172 */ 173 bool delayed_hotplug; 174 175 /** 176 * @deferred_setup: 177 * 178 * If no outputs are connected (disconnected or unknown) the FB helper 179 * code will defer setup until at least one of the outputs shows up. 180 * This field keeps track of the status so that setup can be retried 181 * at every hotplug event until it succeeds eventually. 182 * 183 * Protected by @lock. 184 */ 185 bool deferred_setup; 186 187 /** 188 * @preferred_bpp: 189 * 190 * Temporary storage for the driver's preferred BPP setting passed to 191 * FB helper initialization. This needs to be tracked so that deferred 192 * FB helper setup can pass this on. 193 * 194 * See also: @deferred_setup 195 */ 196 int preferred_bpp; 197 198 #ifdef CONFIG_FB_DEFERRED_IO 199 /** 200 * @fbdefio: 201 * 202 * Temporary storage for the driver's FB deferred I/O handler. If the 203 * driver uses the DRM fbdev emulation layer, this is set by the core 204 * to a generic deferred I/O handler if a driver is preferring to use 205 * a shadow buffer. 206 */ 207 struct fb_deferred_io fbdefio; 208 #endif 209 }; 210 211 static inline struct drm_fb_helper * 212 drm_fb_helper_from_client(struct drm_client_dev *client) 213 { 214 return container_of(client, struct drm_fb_helper, client); 215 } 216 217 /** 218 * define DRM_FB_HELPER_DEFAULT_OPS - helper define for drm drivers 219 * 220 * Helper define to register default implementations of drm_fb_helper 221 * functions. To be used in struct fb_ops of drm drivers. 222 */ 223 #define DRM_FB_HELPER_DEFAULT_OPS \ 224 .fb_check_var = drm_fb_helper_check_var, \ 225 .fb_set_par = drm_fb_helper_set_par, \ 226 .fb_setcmap = drm_fb_helper_setcmap, \ 227 .fb_blank = drm_fb_helper_blank, \ 228 .fb_pan_display = drm_fb_helper_pan_display, \ 229 .fb_debug_enter = drm_fb_helper_debug_enter, \ 230 .fb_debug_leave = drm_fb_helper_debug_leave, \ 231 .fb_ioctl = drm_fb_helper_ioctl 232 233 #ifdef CONFIG_DRM_FBDEV_EMULATION 234 void drm_fb_helper_prepare(struct drm_device *dev, struct drm_fb_helper *helper, 235 unsigned int preferred_bpp, 236 const struct drm_fb_helper_funcs *funcs); 237 void drm_fb_helper_unprepare(struct drm_fb_helper *fb_helper); 238 int drm_fb_helper_init(struct drm_device *dev, struct drm_fb_helper *helper); 239 void drm_fb_helper_fini(struct drm_fb_helper *helper); 240 int drm_fb_helper_blank(int blank, struct fb_info *info); 241 int drm_fb_helper_pan_display(struct fb_var_screeninfo *var, 242 struct fb_info *info); 243 int drm_fb_helper_set_par(struct fb_info *info); 244 int drm_fb_helper_check_var(struct fb_var_screeninfo *var, 245 struct fb_info *info); 246 247 int drm_fb_helper_restore_fbdev_mode_unlocked(struct drm_fb_helper *fb_helper); 248 249 struct fb_info *drm_fb_helper_alloc_info(struct drm_fb_helper *fb_helper); 250 void drm_fb_helper_release_info(struct drm_fb_helper *fb_helper); 251 void drm_fb_helper_unregister_info(struct drm_fb_helper *fb_helper); 252 void drm_fb_helper_fill_info(struct fb_info *info, 253 struct drm_fb_helper *fb_helper, 254 struct drm_fb_helper_surface_size *sizes); 255 256 void drm_fb_helper_damage_range(struct fb_info *info, off_t off, size_t len); 257 void drm_fb_helper_damage_area(struct fb_info *info, u32 x, u32 y, u32 width, u32 height); 258 259 void drm_fb_helper_deferred_io(struct fb_info *info, struct list_head *pagereflist); 260 261 void drm_fb_helper_set_suspend(struct drm_fb_helper *fb_helper, bool suspend); 262 void drm_fb_helper_set_suspend_unlocked(struct drm_fb_helper *fb_helper, 263 bool suspend); 264 265 int drm_fb_helper_setcmap(struct fb_cmap *cmap, struct fb_info *info); 266 267 int drm_fb_helper_ioctl(struct fb_info *info, unsigned int cmd, 268 unsigned long arg); 269 270 int drm_fb_helper_hotplug_event(struct drm_fb_helper *fb_helper); 271 int drm_fb_helper_initial_config(struct drm_fb_helper *fb_helper); 272 int drm_fb_helper_debug_enter(struct fb_info *info); 273 int drm_fb_helper_debug_leave(struct fb_info *info); 274 275 void drm_fb_helper_lastclose(struct drm_device *dev); 276 void drm_fb_helper_output_poll_changed(struct drm_device *dev); 277 #else 278 static inline void drm_fb_helper_prepare(struct drm_device *dev, 279 struct drm_fb_helper *helper, 280 unsigned int preferred_bpp, 281 const struct drm_fb_helper_funcs *funcs) 282 { 283 } 284 285 static inline void drm_fb_helper_unprepare(struct drm_fb_helper *fb_helper) 286 { 287 } 288 289 static inline int drm_fb_helper_init(struct drm_device *dev, 290 struct drm_fb_helper *helper) 291 { 292 /* So drivers can use it to free the struct */ 293 helper->dev = dev; 294 dev->fb_helper = helper; 295 296 return 0; 297 } 298 299 static inline void drm_fb_helper_fini(struct drm_fb_helper *helper) 300 { 301 if (helper && helper->dev) 302 helper->dev->fb_helper = NULL; 303 } 304 305 static inline int drm_fb_helper_blank(int blank, struct fb_info *info) 306 { 307 return 0; 308 } 309 310 static inline int drm_fb_helper_pan_display(struct fb_var_screeninfo *var, 311 struct fb_info *info) 312 { 313 return 0; 314 } 315 316 static inline int drm_fb_helper_set_par(struct fb_info *info) 317 { 318 return 0; 319 } 320 321 static inline int drm_fb_helper_check_var(struct fb_var_screeninfo *var, 322 struct fb_info *info) 323 { 324 return 0; 325 } 326 327 static inline int 328 drm_fb_helper_restore_fbdev_mode_unlocked(struct drm_fb_helper *fb_helper) 329 { 330 return 0; 331 } 332 333 static inline struct fb_info * 334 drm_fb_helper_alloc_info(struct drm_fb_helper *fb_helper) 335 { 336 return NULL; 337 } 338 339 static inline void drm_fb_helper_release_info(struct drm_fb_helper *fb_helper) 340 { 341 } 342 343 static inline void drm_fb_helper_unregister_info(struct drm_fb_helper *fb_helper) 344 { 345 } 346 347 static inline void 348 drm_fb_helper_fill_info(struct fb_info *info, 349 struct drm_fb_helper *fb_helper, 350 struct drm_fb_helper_surface_size *sizes) 351 { 352 } 353 354 static inline int drm_fb_helper_setcmap(struct fb_cmap *cmap, 355 struct fb_info *info) 356 { 357 return 0; 358 } 359 360 static inline int drm_fb_helper_ioctl(struct fb_info *info, unsigned int cmd, 361 unsigned long arg) 362 { 363 return 0; 364 } 365 366 static inline void drm_fb_helper_deferred_io(struct fb_info *info, 367 struct list_head *pagelist) 368 { 369 } 370 371 static inline void drm_fb_helper_set_suspend(struct drm_fb_helper *fb_helper, 372 bool suspend) 373 { 374 } 375 376 static inline void 377 drm_fb_helper_set_suspend_unlocked(struct drm_fb_helper *fb_helper, bool suspend) 378 { 379 } 380 381 static inline int drm_fb_helper_hotplug_event(struct drm_fb_helper *fb_helper) 382 { 383 return 0; 384 } 385 386 static inline int drm_fb_helper_initial_config(struct drm_fb_helper *fb_helper) 387 { 388 return 0; 389 } 390 391 static inline int drm_fb_helper_debug_enter(struct fb_info *info) 392 { 393 return 0; 394 } 395 396 static inline int drm_fb_helper_debug_leave(struct fb_info *info) 397 { 398 return 0; 399 } 400 401 static inline void drm_fb_helper_lastclose(struct drm_device *dev) 402 { 403 } 404 405 static inline void drm_fb_helper_output_poll_changed(struct drm_device *dev) 406 { 407 } 408 #endif 409 410 #endif 411