1 /* 2 * linux/drivers/video/fbmem.c 3 * 4 * Copyright (C) 1994 Martin Schaller 5 * 6 * 2001 - Documented with DocBook 7 * - Brad Douglas <brad@neruo.com> 8 * 9 * This file is subject to the terms and conditions of the GNU General Public 10 * License. See the file COPYING in the main directory of this archive 11 * for more details. 12 */ 13 14 #include <linux/console.h> 15 #include <linux/export.h> 16 #include <linux/fb.h> 17 #include <linux/fbcon.h> 18 19 #include <video/nomodeset.h> 20 21 #include "fb_internal.h" 22 23 /* 24 * Frame buffer device initialization and setup routines 25 */ 26 27 #define FBPIXMAPSIZE (1024 * 8) 28 29 struct class *fb_class; 30 31 DEFINE_MUTEX(registration_lock); 32 struct fb_info *registered_fb[FB_MAX] __read_mostly; 33 int num_registered_fb __read_mostly; 34 #define for_each_registered_fb(i) \ 35 for (i = 0; i < FB_MAX; i++) \ 36 if (!registered_fb[i]) {} else 37 38 struct fb_info *get_fb_info(unsigned int idx) 39 { 40 struct fb_info *fb_info; 41 42 if (idx >= FB_MAX) 43 return ERR_PTR(-ENODEV); 44 45 mutex_lock(®istration_lock); 46 fb_info = registered_fb[idx]; 47 if (fb_info) 48 refcount_inc(&fb_info->count); 49 mutex_unlock(®istration_lock); 50 51 return fb_info; 52 } 53 54 void put_fb_info(struct fb_info *fb_info) 55 { 56 if (!refcount_dec_and_test(&fb_info->count)) 57 return; 58 if (fb_info->fbops->fb_destroy) 59 fb_info->fbops->fb_destroy(fb_info); 60 } 61 62 /* 63 * Helpers 64 */ 65 66 int fb_get_color_depth(struct fb_var_screeninfo *var, 67 struct fb_fix_screeninfo *fix) 68 { 69 int depth = 0; 70 71 if (fix->visual == FB_VISUAL_MONO01 || 72 fix->visual == FB_VISUAL_MONO10) 73 depth = 1; 74 else { 75 if (var->green.length == var->blue.length && 76 var->green.length == var->red.length && 77 var->green.offset == var->blue.offset && 78 var->green.offset == var->red.offset) 79 depth = var->green.length; 80 else 81 depth = var->green.length + var->red.length + 82 var->blue.length; 83 } 84 85 return depth; 86 } 87 EXPORT_SYMBOL(fb_get_color_depth); 88 89 /* 90 * Data padding functions. 91 */ 92 void fb_pad_aligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 s_pitch, u32 height) 93 { 94 __fb_pad_aligned_buffer(dst, d_pitch, src, s_pitch, height); 95 } 96 EXPORT_SYMBOL(fb_pad_aligned_buffer); 97 98 void fb_pad_unaligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 idx, u32 height, 99 u32 shift_high, u32 shift_low, u32 mod) 100 { 101 u8 mask = (u8) (0xfff << shift_high), tmp; 102 int i, j; 103 104 for (i = height; i--; ) { 105 for (j = 0; j < idx; j++) { 106 tmp = dst[j]; 107 tmp &= mask; 108 tmp |= *src >> shift_low; 109 dst[j] = tmp; 110 tmp = *src << shift_high; 111 dst[j+1] = tmp; 112 src++; 113 } 114 tmp = dst[idx]; 115 tmp &= mask; 116 tmp |= *src >> shift_low; 117 dst[idx] = tmp; 118 if (shift_high < mod) { 119 tmp = *src << shift_high; 120 dst[idx+1] = tmp; 121 } 122 src++; 123 dst += d_pitch; 124 } 125 } 126 EXPORT_SYMBOL(fb_pad_unaligned_buffer); 127 128 /* 129 * we need to lock this section since fb_cursor 130 * may use fb_imageblit() 131 */ 132 char* fb_get_buffer_offset(struct fb_info *info, struct fb_pixmap *buf, u32 size) 133 { 134 u32 align = buf->buf_align - 1, offset; 135 char *addr = buf->addr; 136 137 /* If IO mapped, we need to sync before access, no sharing of 138 * the pixmap is done 139 */ 140 if (buf->flags & FB_PIXMAP_IO) { 141 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC)) 142 info->fbops->fb_sync(info); 143 return addr; 144 } 145 146 /* See if we fit in the remaining pixmap space */ 147 offset = buf->offset + align; 148 offset &= ~align; 149 if (offset + size > buf->size) { 150 /* We do not fit. In order to be able to re-use the buffer, 151 * we must ensure no asynchronous DMA'ing or whatever operation 152 * is in progress, we sync for that. 153 */ 154 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC)) 155 info->fbops->fb_sync(info); 156 offset = 0; 157 } 158 buf->offset = offset + size; 159 addr += offset; 160 161 return addr; 162 } 163 EXPORT_SYMBOL(fb_get_buffer_offset); 164 165 int 166 fb_pan_display(struct fb_info *info, struct fb_var_screeninfo *var) 167 { 168 struct fb_fix_screeninfo *fix = &info->fix; 169 unsigned int yres = info->var.yres; 170 int err = 0; 171 172 if (var->yoffset > 0) { 173 if (var->vmode & FB_VMODE_YWRAP) { 174 if (!fix->ywrapstep || (var->yoffset % fix->ywrapstep)) 175 err = -EINVAL; 176 else 177 yres = 0; 178 } else if (!fix->ypanstep || (var->yoffset % fix->ypanstep)) 179 err = -EINVAL; 180 } 181 182 if (var->xoffset > 0 && (!fix->xpanstep || 183 (var->xoffset % fix->xpanstep))) 184 err = -EINVAL; 185 186 if (err || !info->fbops->fb_pan_display || 187 var->yoffset > info->var.yres_virtual - yres || 188 var->xoffset > info->var.xres_virtual - info->var.xres) 189 return -EINVAL; 190 191 if ((err = info->fbops->fb_pan_display(var, info))) 192 return err; 193 info->var.xoffset = var->xoffset; 194 info->var.yoffset = var->yoffset; 195 if (var->vmode & FB_VMODE_YWRAP) 196 info->var.vmode |= FB_VMODE_YWRAP; 197 else 198 info->var.vmode &= ~FB_VMODE_YWRAP; 199 return 0; 200 } 201 EXPORT_SYMBOL(fb_pan_display); 202 203 static int fb_check_caps(struct fb_info *info, struct fb_var_screeninfo *var, 204 u32 activate) 205 { 206 struct fb_blit_caps caps, fbcaps; 207 int err = 0; 208 209 memset(&caps, 0, sizeof(caps)); 210 memset(&fbcaps, 0, sizeof(fbcaps)); 211 caps.flags = (activate & FB_ACTIVATE_ALL) ? 1 : 0; 212 fbcon_get_requirement(info, &caps); 213 info->fbops->fb_get_caps(info, &fbcaps, var); 214 215 if (!bitmap_subset(caps.x, fbcaps.x, FB_MAX_BLIT_WIDTH) || 216 !bitmap_subset(caps.y, fbcaps.y, FB_MAX_BLIT_HEIGHT) || 217 (fbcaps.len < caps.len)) 218 err = -EINVAL; 219 220 return err; 221 } 222 223 int 224 fb_set_var(struct fb_info *info, struct fb_var_screeninfo *var) 225 { 226 int ret = 0; 227 u32 activate; 228 struct fb_var_screeninfo old_var; 229 struct fb_videomode mode; 230 struct fb_event event; 231 u32 unused; 232 233 if (var->activate & FB_ACTIVATE_INV_MODE) { 234 struct fb_videomode mode1, mode2; 235 236 fb_var_to_videomode(&mode1, var); 237 fb_var_to_videomode(&mode2, &info->var); 238 /* make sure we don't delete the videomode of current var */ 239 ret = fb_mode_is_equal(&mode1, &mode2); 240 if (!ret) { 241 ret = fbcon_mode_deleted(info, &mode1); 242 if (!ret) 243 fb_delete_videomode(&mode1, &info->modelist); 244 } 245 246 return ret ? -EINVAL : 0; 247 } 248 249 if (!(var->activate & FB_ACTIVATE_FORCE) && 250 !memcmp(&info->var, var, sizeof(struct fb_var_screeninfo))) 251 return 0; 252 253 activate = var->activate; 254 255 /* When using FOURCC mode, make sure the red, green, blue and 256 * transp fields are set to 0. 257 */ 258 if ((info->fix.capabilities & FB_CAP_FOURCC) && 259 var->grayscale > 1) { 260 if (var->red.offset || var->green.offset || 261 var->blue.offset || var->transp.offset || 262 var->red.length || var->green.length || 263 var->blue.length || var->transp.length || 264 var->red.msb_right || var->green.msb_right || 265 var->blue.msb_right || var->transp.msb_right) 266 return -EINVAL; 267 } 268 269 if (!info->fbops->fb_check_var) { 270 *var = info->var; 271 return 0; 272 } 273 274 /* bitfill_aligned() assumes that it's at least 8x8 */ 275 if (var->xres < 8 || var->yres < 8) 276 return -EINVAL; 277 278 /* Too huge resolution causes multiplication overflow. */ 279 if (check_mul_overflow(var->xres, var->yres, &unused) || 280 check_mul_overflow(var->xres_virtual, var->yres_virtual, &unused)) 281 return -EINVAL; 282 283 ret = info->fbops->fb_check_var(var, info); 284 285 if (ret) 286 return ret; 287 288 /* verify that virtual resolution >= physical resolution */ 289 if (var->xres_virtual < var->xres || 290 var->yres_virtual < var->yres) { 291 pr_warn("WARNING: fbcon: Driver '%s' missed to adjust virtual screen size (%ux%u vs. %ux%u)\n", 292 info->fix.id, 293 var->xres_virtual, var->yres_virtual, 294 var->xres, var->yres); 295 return -EINVAL; 296 } 297 298 if ((var->activate & FB_ACTIVATE_MASK) != FB_ACTIVATE_NOW) 299 return 0; 300 301 if (info->fbops->fb_get_caps) { 302 ret = fb_check_caps(info, var, activate); 303 304 if (ret) 305 return ret; 306 } 307 308 old_var = info->var; 309 info->var = *var; 310 311 if (info->fbops->fb_set_par) { 312 ret = info->fbops->fb_set_par(info); 313 314 if (ret) { 315 info->var = old_var; 316 printk(KERN_WARNING "detected " 317 "fb_set_par error, " 318 "error code: %d\n", ret); 319 return ret; 320 } 321 } 322 323 fb_pan_display(info, &info->var); 324 fb_set_cmap(&info->cmap, info); 325 fb_var_to_videomode(&mode, &info->var); 326 327 if (info->modelist.prev && info->modelist.next && 328 !list_empty(&info->modelist)) 329 ret = fb_add_videomode(&mode, &info->modelist); 330 331 if (ret) 332 return ret; 333 334 event.info = info; 335 event.data = &mode; 336 fb_notifier_call_chain(FB_EVENT_MODE_CHANGE, &event); 337 338 return 0; 339 } 340 EXPORT_SYMBOL(fb_set_var); 341 342 int 343 fb_blank(struct fb_info *info, int blank) 344 { 345 struct fb_event event; 346 int ret = -EINVAL; 347 348 if (blank > FB_BLANK_POWERDOWN) 349 blank = FB_BLANK_POWERDOWN; 350 351 event.info = info; 352 event.data = ␣ 353 354 if (info->fbops->fb_blank) 355 ret = info->fbops->fb_blank(blank, info); 356 357 if (!ret) 358 fb_notifier_call_chain(FB_EVENT_BLANK, &event); 359 360 return ret; 361 } 362 EXPORT_SYMBOL(fb_blank); 363 364 static int fb_check_foreignness(struct fb_info *fi) 365 { 366 const bool foreign_endian = fi->flags & FBINFO_FOREIGN_ENDIAN; 367 368 fi->flags &= ~FBINFO_FOREIGN_ENDIAN; 369 370 #ifdef __BIG_ENDIAN 371 fi->flags |= foreign_endian ? 0 : FBINFO_BE_MATH; 372 #else 373 fi->flags |= foreign_endian ? FBINFO_BE_MATH : 0; 374 #endif /* __BIG_ENDIAN */ 375 376 if (fi->flags & FBINFO_BE_MATH && !fb_be_math(fi)) { 377 pr_err("%s: enable CONFIG_FB_BIG_ENDIAN to " 378 "support this framebuffer\n", fi->fix.id); 379 return -ENOSYS; 380 } else if (!(fi->flags & FBINFO_BE_MATH) && fb_be_math(fi)) { 381 pr_err("%s: enable CONFIG_FB_LITTLE_ENDIAN to " 382 "support this framebuffer\n", fi->fix.id); 383 return -ENOSYS; 384 } 385 386 return 0; 387 } 388 389 static int do_register_framebuffer(struct fb_info *fb_info) 390 { 391 int i; 392 struct fb_videomode mode; 393 394 if (fb_check_foreignness(fb_info)) 395 return -ENOSYS; 396 397 if (num_registered_fb == FB_MAX) 398 return -ENXIO; 399 400 num_registered_fb++; 401 for (i = 0 ; i < FB_MAX; i++) 402 if (!registered_fb[i]) 403 break; 404 fb_info->node = i; 405 refcount_set(&fb_info->count, 1); 406 mutex_init(&fb_info->lock); 407 mutex_init(&fb_info->mm_lock); 408 409 fb_device_create(fb_info); 410 411 if (fb_info->pixmap.addr == NULL) { 412 fb_info->pixmap.addr = kmalloc(FBPIXMAPSIZE, GFP_KERNEL); 413 if (fb_info->pixmap.addr) { 414 fb_info->pixmap.size = FBPIXMAPSIZE; 415 fb_info->pixmap.buf_align = 1; 416 fb_info->pixmap.scan_align = 1; 417 fb_info->pixmap.access_align = 32; 418 fb_info->pixmap.flags = FB_PIXMAP_DEFAULT; 419 } 420 } 421 fb_info->pixmap.offset = 0; 422 423 if (bitmap_empty(fb_info->pixmap.blit_x, FB_MAX_BLIT_WIDTH)) 424 bitmap_fill(fb_info->pixmap.blit_x, FB_MAX_BLIT_WIDTH); 425 426 if (bitmap_empty(fb_info->pixmap.blit_y, FB_MAX_BLIT_HEIGHT)) 427 bitmap_fill(fb_info->pixmap.blit_y, FB_MAX_BLIT_HEIGHT); 428 429 if (!fb_info->modelist.prev || !fb_info->modelist.next) 430 INIT_LIST_HEAD(&fb_info->modelist); 431 432 if (fb_info->skip_vt_switch) 433 pm_vt_switch_required(fb_info->device, false); 434 else 435 pm_vt_switch_required(fb_info->device, true); 436 437 fb_var_to_videomode(&mode, &fb_info->var); 438 fb_add_videomode(&mode, &fb_info->modelist); 439 registered_fb[i] = fb_info; 440 441 #ifdef CONFIG_GUMSTIX_AM200EPD 442 { 443 struct fb_event event; 444 event.info = fb_info; 445 fb_notifier_call_chain(FB_EVENT_FB_REGISTERED, &event); 446 } 447 #endif 448 449 return fbcon_fb_registered(fb_info); 450 } 451 452 static void unbind_console(struct fb_info *fb_info) 453 { 454 int i = fb_info->node; 455 456 if (WARN_ON(i < 0 || i >= FB_MAX || registered_fb[i] != fb_info)) 457 return; 458 459 fbcon_fb_unbind(fb_info); 460 } 461 462 static void unlink_framebuffer(struct fb_info *fb_info) 463 { 464 int i; 465 466 i = fb_info->node; 467 if (WARN_ON(i < 0 || i >= FB_MAX || registered_fb[i] != fb_info)) 468 return; 469 470 fb_device_destroy(fb_info); 471 pm_vt_switch_unregister(fb_info->device); 472 unbind_console(fb_info); 473 } 474 475 static void do_unregister_framebuffer(struct fb_info *fb_info) 476 { 477 unlink_framebuffer(fb_info); 478 if (fb_info->pixmap.addr && 479 (fb_info->pixmap.flags & FB_PIXMAP_DEFAULT)) { 480 kfree(fb_info->pixmap.addr); 481 fb_info->pixmap.addr = NULL; 482 } 483 484 fb_destroy_modelist(&fb_info->modelist); 485 registered_fb[fb_info->node] = NULL; 486 num_registered_fb--; 487 #ifdef CONFIG_GUMSTIX_AM200EPD 488 { 489 struct fb_event event; 490 event.info = fb_info; 491 fb_notifier_call_chain(FB_EVENT_FB_UNREGISTERED, &event); 492 } 493 #endif 494 fbcon_fb_unregistered(fb_info); 495 496 /* this may free fb info */ 497 put_fb_info(fb_info); 498 } 499 500 /** 501 * register_framebuffer - registers a frame buffer device 502 * @fb_info: frame buffer info structure 503 * 504 * Registers a frame buffer device @fb_info. 505 * 506 * Returns negative errno on error, or zero for success. 507 * 508 */ 509 int 510 register_framebuffer(struct fb_info *fb_info) 511 { 512 int ret; 513 514 mutex_lock(®istration_lock); 515 ret = do_register_framebuffer(fb_info); 516 mutex_unlock(®istration_lock); 517 518 return ret; 519 } 520 EXPORT_SYMBOL(register_framebuffer); 521 522 /** 523 * unregister_framebuffer - releases a frame buffer device 524 * @fb_info: frame buffer info structure 525 * 526 * Unregisters a frame buffer device @fb_info. 527 * 528 * Returns negative errno on error, or zero for success. 529 * 530 * This function will also notify the framebuffer console 531 * to release the driver. 532 * 533 * This is meant to be called within a driver's module_exit() 534 * function. If this is called outside module_exit(), ensure 535 * that the driver implements fb_open() and fb_release() to 536 * check that no processes are using the device. 537 */ 538 void 539 unregister_framebuffer(struct fb_info *fb_info) 540 { 541 mutex_lock(®istration_lock); 542 do_unregister_framebuffer(fb_info); 543 mutex_unlock(®istration_lock); 544 } 545 EXPORT_SYMBOL(unregister_framebuffer); 546 547 static void devm_unregister_framebuffer(void *data) 548 { 549 struct fb_info *info = data; 550 551 unregister_framebuffer(info); 552 } 553 554 /** 555 * devm_register_framebuffer - resource-managed frame buffer device registration 556 * @dev: device the framebuffer belongs to 557 * @fb_info: frame buffer info structure 558 * 559 * Registers a frame buffer device @fb_info to device @dev. 560 * 561 * Returns negative errno on error, or zero for success. 562 * 563 */ 564 int 565 devm_register_framebuffer(struct device *dev, struct fb_info *fb_info) 566 { 567 int ret; 568 569 ret = register_framebuffer(fb_info); 570 if (ret) 571 return ret; 572 573 return devm_add_action_or_reset(dev, devm_unregister_framebuffer, fb_info); 574 } 575 EXPORT_SYMBOL(devm_register_framebuffer); 576 577 /** 578 * fb_set_suspend - low level driver signals suspend 579 * @info: framebuffer affected 580 * @state: 0 = resuming, !=0 = suspending 581 * 582 * This is meant to be used by low level drivers to 583 * signal suspend/resume to the core & clients. 584 * It must be called with the console semaphore held 585 */ 586 void fb_set_suspend(struct fb_info *info, int state) 587 { 588 WARN_CONSOLE_UNLOCKED(); 589 590 if (state) { 591 fbcon_suspended(info); 592 info->state = FBINFO_STATE_SUSPENDED; 593 } else { 594 info->state = FBINFO_STATE_RUNNING; 595 fbcon_resumed(info); 596 } 597 } 598 EXPORT_SYMBOL(fb_set_suspend); 599 600 static int __init fbmem_init(void) 601 { 602 int ret; 603 604 fb_class = class_create("graphics"); 605 if (IS_ERR(fb_class)) { 606 ret = PTR_ERR(fb_class); 607 pr_err("Unable to create fb class; errno = %d\n", ret); 608 goto err_fb_class; 609 } 610 611 ret = fb_init_procfs(); 612 if (ret) 613 goto err_class_destroy; 614 615 ret = fb_register_chrdev(); 616 if (ret) 617 goto err_fb_cleanup_procfs; 618 619 fb_console_init(); 620 621 return 0; 622 623 err_fb_cleanup_procfs: 624 fb_cleanup_procfs(); 625 err_class_destroy: 626 class_destroy(fb_class); 627 err_fb_class: 628 fb_class = NULL; 629 return ret; 630 } 631 632 #ifdef MODULE 633 static void __exit fbmem_exit(void) 634 { 635 fb_console_exit(); 636 fb_unregister_chrdev(); 637 fb_cleanup_procfs(); 638 class_destroy(fb_class); 639 } 640 641 module_init(fbmem_init); 642 module_exit(fbmem_exit); 643 MODULE_LICENSE("GPL"); 644 MODULE_DESCRIPTION("Framebuffer base"); 645 #else 646 subsys_initcall(fbmem_init); 647 #endif 648 649 int fb_new_modelist(struct fb_info *info) 650 { 651 struct fb_var_screeninfo var = info->var; 652 struct list_head *pos, *n; 653 struct fb_modelist *modelist; 654 struct fb_videomode *m, mode; 655 int err; 656 657 list_for_each_safe(pos, n, &info->modelist) { 658 modelist = list_entry(pos, struct fb_modelist, list); 659 m = &modelist->mode; 660 fb_videomode_to_var(&var, m); 661 var.activate = FB_ACTIVATE_TEST; 662 err = fb_set_var(info, &var); 663 fb_var_to_videomode(&mode, &var); 664 if (err || !fb_mode_is_equal(m, &mode)) { 665 list_del(pos); 666 kfree(pos); 667 } 668 } 669 670 if (list_empty(&info->modelist)) 671 return 1; 672 673 fbcon_new_modelist(info); 674 675 return 0; 676 } 677 678 bool fb_modesetting_disabled(const char *drvname) 679 { 680 bool fwonly = video_firmware_drivers_only(); 681 682 if (fwonly) 683 pr_warn("Driver %s not loading because of nomodeset parameter\n", 684 drvname); 685 686 return fwonly; 687 } 688 EXPORT_SYMBOL(fb_modesetting_disabled); 689 690 MODULE_LICENSE("GPL"); 691