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/module.h> 15 16 #include <linux/types.h> 17 #include <linux/errno.h> 18 #include <linux/kernel.h> 19 #include <linux/slab.h> 20 #include <linux/mm.h> 21 #include <linux/mman.h> 22 #include <linux/vt.h> 23 #include <linux/init.h> 24 #include <linux/linux_logo.h> 25 #include <linux/platform_device.h> 26 #include <linux/console.h> 27 #include <linux/kmod.h> 28 #include <linux/err.h> 29 #include <linux/device.h> 30 #include <linux/efi.h> 31 #include <linux/fb.h> 32 #include <linux/fbcon.h> 33 #include <linux/mem_encrypt.h> 34 #include <linux/pci.h> 35 36 #include <video/nomodeset.h> 37 #include <video/vga.h> 38 39 #include "fb_internal.h" 40 41 /* 42 * Frame buffer device initialization and setup routines 43 */ 44 45 #define FBPIXMAPSIZE (1024 * 8) 46 47 struct class *fb_class; 48 49 DEFINE_MUTEX(registration_lock); 50 struct fb_info *registered_fb[FB_MAX] __read_mostly; 51 int num_registered_fb __read_mostly; 52 #define for_each_registered_fb(i) \ 53 for (i = 0; i < FB_MAX; i++) \ 54 if (!registered_fb[i]) {} else 55 56 bool fb_center_logo __read_mostly; 57 58 int fb_logo_count __read_mostly = -1; 59 60 struct fb_info *get_fb_info(unsigned int idx) 61 { 62 struct fb_info *fb_info; 63 64 if (idx >= FB_MAX) 65 return ERR_PTR(-ENODEV); 66 67 mutex_lock(®istration_lock); 68 fb_info = registered_fb[idx]; 69 if (fb_info) 70 refcount_inc(&fb_info->count); 71 mutex_unlock(®istration_lock); 72 73 return fb_info; 74 } 75 76 void put_fb_info(struct fb_info *fb_info) 77 { 78 if (!refcount_dec_and_test(&fb_info->count)) 79 return; 80 if (fb_info->fbops->fb_destroy) 81 fb_info->fbops->fb_destroy(fb_info); 82 } 83 84 /* 85 * Helpers 86 */ 87 88 int fb_get_color_depth(struct fb_var_screeninfo *var, 89 struct fb_fix_screeninfo *fix) 90 { 91 int depth = 0; 92 93 if (fix->visual == FB_VISUAL_MONO01 || 94 fix->visual == FB_VISUAL_MONO10) 95 depth = 1; 96 else { 97 if (var->green.length == var->blue.length && 98 var->green.length == var->red.length && 99 var->green.offset == var->blue.offset && 100 var->green.offset == var->red.offset) 101 depth = var->green.length; 102 else 103 depth = var->green.length + var->red.length + 104 var->blue.length; 105 } 106 107 return depth; 108 } 109 EXPORT_SYMBOL(fb_get_color_depth); 110 111 /* 112 * Data padding functions. 113 */ 114 void fb_pad_aligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 s_pitch, u32 height) 115 { 116 __fb_pad_aligned_buffer(dst, d_pitch, src, s_pitch, height); 117 } 118 EXPORT_SYMBOL(fb_pad_aligned_buffer); 119 120 void fb_pad_unaligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 idx, u32 height, 121 u32 shift_high, u32 shift_low, u32 mod) 122 { 123 u8 mask = (u8) (0xfff << shift_high), tmp; 124 int i, j; 125 126 for (i = height; i--; ) { 127 for (j = 0; j < idx; j++) { 128 tmp = dst[j]; 129 tmp &= mask; 130 tmp |= *src >> shift_low; 131 dst[j] = tmp; 132 tmp = *src << shift_high; 133 dst[j+1] = tmp; 134 src++; 135 } 136 tmp = dst[idx]; 137 tmp &= mask; 138 tmp |= *src >> shift_low; 139 dst[idx] = tmp; 140 if (shift_high < mod) { 141 tmp = *src << shift_high; 142 dst[idx+1] = tmp; 143 } 144 src++; 145 dst += d_pitch; 146 } 147 } 148 EXPORT_SYMBOL(fb_pad_unaligned_buffer); 149 150 /* 151 * we need to lock this section since fb_cursor 152 * may use fb_imageblit() 153 */ 154 char* fb_get_buffer_offset(struct fb_info *info, struct fb_pixmap *buf, u32 size) 155 { 156 u32 align = buf->buf_align - 1, offset; 157 char *addr = buf->addr; 158 159 /* If IO mapped, we need to sync before access, no sharing of 160 * the pixmap is done 161 */ 162 if (buf->flags & FB_PIXMAP_IO) { 163 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC)) 164 info->fbops->fb_sync(info); 165 return addr; 166 } 167 168 /* See if we fit in the remaining pixmap space */ 169 offset = buf->offset + align; 170 offset &= ~align; 171 if (offset + size > buf->size) { 172 /* We do not fit. In order to be able to re-use the buffer, 173 * we must ensure no asynchronous DMA'ing or whatever operation 174 * is in progress, we sync for that. 175 */ 176 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC)) 177 info->fbops->fb_sync(info); 178 offset = 0; 179 } 180 buf->offset = offset + size; 181 addr += offset; 182 183 return addr; 184 } 185 EXPORT_SYMBOL(fb_get_buffer_offset); 186 187 #ifdef CONFIG_LOGO 188 189 static inline unsigned safe_shift(unsigned d, int n) 190 { 191 return n < 0 ? d >> -n : d << n; 192 } 193 194 static void fb_set_logocmap(struct fb_info *info, 195 const struct linux_logo *logo) 196 { 197 struct fb_cmap palette_cmap; 198 u16 palette_green[16]; 199 u16 palette_blue[16]; 200 u16 palette_red[16]; 201 int i, j, n; 202 const unsigned char *clut = logo->clut; 203 204 palette_cmap.start = 0; 205 palette_cmap.len = 16; 206 palette_cmap.red = palette_red; 207 palette_cmap.green = palette_green; 208 palette_cmap.blue = palette_blue; 209 palette_cmap.transp = NULL; 210 211 for (i = 0; i < logo->clutsize; i += n) { 212 n = logo->clutsize - i; 213 /* palette_cmap provides space for only 16 colors at once */ 214 if (n > 16) 215 n = 16; 216 palette_cmap.start = 32 + i; 217 palette_cmap.len = n; 218 for (j = 0; j < n; ++j) { 219 palette_cmap.red[j] = clut[0] << 8 | clut[0]; 220 palette_cmap.green[j] = clut[1] << 8 | clut[1]; 221 palette_cmap.blue[j] = clut[2] << 8 | clut[2]; 222 clut += 3; 223 } 224 fb_set_cmap(&palette_cmap, info); 225 } 226 } 227 228 static void fb_set_logo_truepalette(struct fb_info *info, 229 const struct linux_logo *logo, 230 u32 *palette) 231 { 232 static const unsigned char mask[] = { 0,0x80,0xc0,0xe0,0xf0,0xf8,0xfc,0xfe,0xff }; 233 unsigned char redmask, greenmask, bluemask; 234 int redshift, greenshift, blueshift; 235 int i; 236 const unsigned char *clut = logo->clut; 237 238 /* 239 * We have to create a temporary palette since console palette is only 240 * 16 colors long. 241 */ 242 /* Bug: Doesn't obey msb_right ... (who needs that?) */ 243 redmask = mask[info->var.red.length < 8 ? info->var.red.length : 8]; 244 greenmask = mask[info->var.green.length < 8 ? info->var.green.length : 8]; 245 bluemask = mask[info->var.blue.length < 8 ? info->var.blue.length : 8]; 246 redshift = info->var.red.offset - (8 - info->var.red.length); 247 greenshift = info->var.green.offset - (8 - info->var.green.length); 248 blueshift = info->var.blue.offset - (8 - info->var.blue.length); 249 250 for ( i = 0; i < logo->clutsize; i++) { 251 palette[i+32] = (safe_shift((clut[0] & redmask), redshift) | 252 safe_shift((clut[1] & greenmask), greenshift) | 253 safe_shift((clut[2] & bluemask), blueshift)); 254 clut += 3; 255 } 256 } 257 258 static void fb_set_logo_directpalette(struct fb_info *info, 259 const struct linux_logo *logo, 260 u32 *palette) 261 { 262 int redshift, greenshift, blueshift; 263 int i; 264 265 redshift = info->var.red.offset; 266 greenshift = info->var.green.offset; 267 blueshift = info->var.blue.offset; 268 269 for (i = 32; i < 32 + logo->clutsize; i++) 270 palette[i] = i << redshift | i << greenshift | i << blueshift; 271 } 272 273 static void fb_set_logo(struct fb_info *info, 274 const struct linux_logo *logo, u8 *dst, 275 int depth) 276 { 277 int i, j, k; 278 const u8 *src = logo->data; 279 u8 xor = (info->fix.visual == FB_VISUAL_MONO01) ? 0xff : 0; 280 u8 fg = 1, d; 281 282 switch (fb_get_color_depth(&info->var, &info->fix)) { 283 case 1: 284 fg = 1; 285 break; 286 case 2: 287 fg = 3; 288 break; 289 default: 290 fg = 7; 291 break; 292 } 293 294 if (info->fix.visual == FB_VISUAL_MONO01 || 295 info->fix.visual == FB_VISUAL_MONO10) 296 fg = ~((u8) (0xfff << info->var.green.length)); 297 298 switch (depth) { 299 case 4: 300 for (i = 0; i < logo->height; i++) 301 for (j = 0; j < logo->width; src++) { 302 *dst++ = *src >> 4; 303 j++; 304 if (j < logo->width) { 305 *dst++ = *src & 0x0f; 306 j++; 307 } 308 } 309 break; 310 case 1: 311 for (i = 0; i < logo->height; i++) { 312 for (j = 0; j < logo->width; src++) { 313 d = *src ^ xor; 314 for (k = 7; k >= 0 && j < logo->width; k--) { 315 *dst++ = ((d >> k) & 1) ? fg : 0; 316 j++; 317 } 318 } 319 } 320 break; 321 } 322 } 323 324 /* 325 * Three (3) kinds of logo maps exist. linux_logo_clut224 (>16 colors), 326 * linux_logo_vga16 (16 colors) and linux_logo_mono (2 colors). Depending on 327 * the visual format and color depth of the framebuffer, the DAC, the 328 * pseudo_palette, and the logo data will be adjusted accordingly. 329 * 330 * Case 1 - linux_logo_clut224: 331 * Color exceeds the number of console colors (16), thus we set the hardware DAC 332 * using fb_set_cmap() appropriately. The "needs_cmapreset" flag will be set. 333 * 334 * For visuals that require color info from the pseudo_palette, we also construct 335 * one for temporary use. The "needs_directpalette" or "needs_truepalette" flags 336 * will be set. 337 * 338 * Case 2 - linux_logo_vga16: 339 * The number of colors just matches the console colors, thus there is no need 340 * to set the DAC or the pseudo_palette. However, the bitmap is packed, ie, 341 * each byte contains color information for two pixels (upper and lower nibble). 342 * To be consistent with fb_imageblit() usage, we therefore separate the two 343 * nibbles into separate bytes. The "depth" flag will be set to 4. 344 * 345 * Case 3 - linux_logo_mono: 346 * This is similar with Case 2. Each byte contains information for 8 pixels. 347 * We isolate each bit and expand each into a byte. The "depth" flag will 348 * be set to 1. 349 */ 350 static struct logo_data { 351 int depth; 352 int needs_directpalette; 353 int needs_truepalette; 354 int needs_cmapreset; 355 const struct linux_logo *logo; 356 } fb_logo __read_mostly; 357 358 static void fb_rotate_logo_ud(const u8 *in, u8 *out, u32 width, u32 height) 359 { 360 u32 size = width * height, i; 361 362 out += size - 1; 363 364 for (i = size; i--; ) 365 *out-- = *in++; 366 } 367 368 static void fb_rotate_logo_cw(const u8 *in, u8 *out, u32 width, u32 height) 369 { 370 int i, j, h = height - 1; 371 372 for (i = 0; i < height; i++) 373 for (j = 0; j < width; j++) 374 out[height * j + h - i] = *in++; 375 } 376 377 static void fb_rotate_logo_ccw(const u8 *in, u8 *out, u32 width, u32 height) 378 { 379 int i, j, w = width - 1; 380 381 for (i = 0; i < height; i++) 382 for (j = 0; j < width; j++) 383 out[height * (w - j) + i] = *in++; 384 } 385 386 static void fb_rotate_logo(struct fb_info *info, u8 *dst, 387 struct fb_image *image, int rotate) 388 { 389 u32 tmp; 390 391 if (rotate == FB_ROTATE_UD) { 392 fb_rotate_logo_ud(image->data, dst, image->width, 393 image->height); 394 image->dx = info->var.xres - image->width - image->dx; 395 image->dy = info->var.yres - image->height - image->dy; 396 } else if (rotate == FB_ROTATE_CW) { 397 fb_rotate_logo_cw(image->data, dst, image->width, 398 image->height); 399 swap(image->width, image->height); 400 tmp = image->dy; 401 image->dy = image->dx; 402 image->dx = info->var.xres - image->width - tmp; 403 } else if (rotate == FB_ROTATE_CCW) { 404 fb_rotate_logo_ccw(image->data, dst, image->width, 405 image->height); 406 swap(image->width, image->height); 407 tmp = image->dx; 408 image->dx = image->dy; 409 image->dy = info->var.yres - image->height - tmp; 410 } 411 412 image->data = dst; 413 } 414 415 static void fb_do_show_logo(struct fb_info *info, struct fb_image *image, 416 int rotate, unsigned int num) 417 { 418 unsigned int x; 419 420 if (image->width > info->var.xres || image->height > info->var.yres) 421 return; 422 423 if (rotate == FB_ROTATE_UR) { 424 for (x = 0; 425 x < num && image->dx + image->width <= info->var.xres; 426 x++) { 427 info->fbops->fb_imageblit(info, image); 428 image->dx += image->width + 8; 429 } 430 } else if (rotate == FB_ROTATE_UD) { 431 u32 dx = image->dx; 432 433 for (x = 0; x < num && image->dx <= dx; x++) { 434 info->fbops->fb_imageblit(info, image); 435 image->dx -= image->width + 8; 436 } 437 } else if (rotate == FB_ROTATE_CW) { 438 for (x = 0; 439 x < num && image->dy + image->height <= info->var.yres; 440 x++) { 441 info->fbops->fb_imageblit(info, image); 442 image->dy += image->height + 8; 443 } 444 } else if (rotate == FB_ROTATE_CCW) { 445 u32 dy = image->dy; 446 447 for (x = 0; x < num && image->dy <= dy; x++) { 448 info->fbops->fb_imageblit(info, image); 449 image->dy -= image->height + 8; 450 } 451 } 452 } 453 454 static int fb_show_logo_line(struct fb_info *info, int rotate, 455 const struct linux_logo *logo, int y, 456 unsigned int n) 457 { 458 u32 *palette = NULL, *saved_pseudo_palette = NULL; 459 unsigned char *logo_new = NULL, *logo_rotate = NULL; 460 struct fb_image image; 461 462 /* Return if the frame buffer is not mapped or suspended */ 463 if (logo == NULL || info->state != FBINFO_STATE_RUNNING || 464 info->fbops->owner) 465 return 0; 466 467 image.depth = 8; 468 image.data = logo->data; 469 470 if (fb_logo.needs_cmapreset) 471 fb_set_logocmap(info, logo); 472 473 if (fb_logo.needs_truepalette || 474 fb_logo.needs_directpalette) { 475 palette = kmalloc(256 * 4, GFP_KERNEL); 476 if (palette == NULL) 477 return 0; 478 479 if (fb_logo.needs_truepalette) 480 fb_set_logo_truepalette(info, logo, palette); 481 else 482 fb_set_logo_directpalette(info, logo, palette); 483 484 saved_pseudo_palette = info->pseudo_palette; 485 info->pseudo_palette = palette; 486 } 487 488 if (fb_logo.depth <= 4) { 489 logo_new = kmalloc_array(logo->width, logo->height, 490 GFP_KERNEL); 491 if (logo_new == NULL) { 492 kfree(palette); 493 if (saved_pseudo_palette) 494 info->pseudo_palette = saved_pseudo_palette; 495 return 0; 496 } 497 image.data = logo_new; 498 fb_set_logo(info, logo, logo_new, fb_logo.depth); 499 } 500 501 if (fb_center_logo) { 502 int xres = info->var.xres; 503 int yres = info->var.yres; 504 505 if (rotate == FB_ROTATE_CW || rotate == FB_ROTATE_CCW) { 506 xres = info->var.yres; 507 yres = info->var.xres; 508 } 509 510 while (n && (n * (logo->width + 8) - 8 > xres)) 511 --n; 512 image.dx = (xres - (n * (logo->width + 8) - 8)) / 2; 513 image.dy = y ?: (yres - logo->height) / 2; 514 } else { 515 image.dx = 0; 516 image.dy = y; 517 } 518 519 image.width = logo->width; 520 image.height = logo->height; 521 522 if (rotate) { 523 logo_rotate = kmalloc_array(logo->width, logo->height, 524 GFP_KERNEL); 525 if (logo_rotate) 526 fb_rotate_logo(info, logo_rotate, &image, rotate); 527 } 528 529 fb_do_show_logo(info, &image, rotate, n); 530 531 kfree(palette); 532 if (saved_pseudo_palette != NULL) 533 info->pseudo_palette = saved_pseudo_palette; 534 kfree(logo_new); 535 kfree(logo_rotate); 536 return image.dy + logo->height; 537 } 538 539 540 #ifdef CONFIG_FB_LOGO_EXTRA 541 542 #define FB_LOGO_EX_NUM_MAX 10 543 static struct logo_data_extra { 544 const struct linux_logo *logo; 545 unsigned int n; 546 } fb_logo_ex[FB_LOGO_EX_NUM_MAX]; 547 static unsigned int fb_logo_ex_num; 548 549 void fb_append_extra_logo(const struct linux_logo *logo, unsigned int n) 550 { 551 if (!n || fb_logo_ex_num == FB_LOGO_EX_NUM_MAX) 552 return; 553 554 fb_logo_ex[fb_logo_ex_num].logo = logo; 555 fb_logo_ex[fb_logo_ex_num].n = n; 556 fb_logo_ex_num++; 557 } 558 559 static int fb_prepare_extra_logos(struct fb_info *info, unsigned int height, 560 unsigned int yres) 561 { 562 unsigned int i; 563 564 /* FIXME: logo_ex supports only truecolor fb. */ 565 if (info->fix.visual != FB_VISUAL_TRUECOLOR) 566 fb_logo_ex_num = 0; 567 568 for (i = 0; i < fb_logo_ex_num; i++) { 569 if (fb_logo_ex[i].logo->type != fb_logo.logo->type) { 570 fb_logo_ex[i].logo = NULL; 571 continue; 572 } 573 height += fb_logo_ex[i].logo->height; 574 if (height > yres) { 575 height -= fb_logo_ex[i].logo->height; 576 fb_logo_ex_num = i; 577 break; 578 } 579 } 580 return height; 581 } 582 583 static int fb_show_extra_logos(struct fb_info *info, int y, int rotate) 584 { 585 unsigned int i; 586 587 for (i = 0; i < fb_logo_ex_num; i++) 588 y = fb_show_logo_line(info, rotate, 589 fb_logo_ex[i].logo, y, fb_logo_ex[i].n); 590 591 return y; 592 } 593 594 #else /* !CONFIG_FB_LOGO_EXTRA */ 595 596 static inline int fb_prepare_extra_logos(struct fb_info *info, 597 unsigned int height, 598 unsigned int yres) 599 { 600 return height; 601 } 602 603 static inline int fb_show_extra_logos(struct fb_info *info, int y, int rotate) 604 { 605 return y; 606 } 607 608 #endif /* CONFIG_FB_LOGO_EXTRA */ 609 610 611 int fb_prepare_logo(struct fb_info *info, int rotate) 612 { 613 int depth = fb_get_color_depth(&info->var, &info->fix); 614 unsigned int yres; 615 int height; 616 617 memset(&fb_logo, 0, sizeof(struct logo_data)); 618 619 if (info->flags & FBINFO_MISC_TILEBLITTING || 620 info->fbops->owner || !fb_logo_count) 621 return 0; 622 623 if (info->fix.visual == FB_VISUAL_DIRECTCOLOR) { 624 depth = info->var.blue.length; 625 if (info->var.red.length < depth) 626 depth = info->var.red.length; 627 if (info->var.green.length < depth) 628 depth = info->var.green.length; 629 } 630 631 if (info->fix.visual == FB_VISUAL_STATIC_PSEUDOCOLOR && depth > 4) { 632 /* assume console colormap */ 633 depth = 4; 634 } 635 636 /* Return if no suitable logo was found */ 637 fb_logo.logo = fb_find_logo(depth); 638 639 if (!fb_logo.logo) { 640 return 0; 641 } 642 643 if (rotate == FB_ROTATE_UR || rotate == FB_ROTATE_UD) 644 yres = info->var.yres; 645 else 646 yres = info->var.xres; 647 648 if (fb_logo.logo->height > yres) { 649 fb_logo.logo = NULL; 650 return 0; 651 } 652 653 /* What depth we asked for might be different from what we get */ 654 if (fb_logo.logo->type == LINUX_LOGO_CLUT224) 655 fb_logo.depth = 8; 656 else if (fb_logo.logo->type == LINUX_LOGO_VGA16) 657 fb_logo.depth = 4; 658 else 659 fb_logo.depth = 1; 660 661 662 if (fb_logo.depth > 4 && depth > 4) { 663 switch (info->fix.visual) { 664 case FB_VISUAL_TRUECOLOR: 665 fb_logo.needs_truepalette = 1; 666 break; 667 case FB_VISUAL_DIRECTCOLOR: 668 fb_logo.needs_directpalette = 1; 669 fb_logo.needs_cmapreset = 1; 670 break; 671 case FB_VISUAL_PSEUDOCOLOR: 672 fb_logo.needs_cmapreset = 1; 673 break; 674 } 675 } 676 677 height = fb_logo.logo->height; 678 if (fb_center_logo) 679 height += (yres - fb_logo.logo->height) / 2; 680 681 return fb_prepare_extra_logos(info, height, yres); 682 } 683 684 int fb_show_logo(struct fb_info *info, int rotate) 685 { 686 unsigned int count; 687 int y; 688 689 if (!fb_logo_count) 690 return 0; 691 692 count = fb_logo_count < 0 ? num_online_cpus() : fb_logo_count; 693 y = fb_show_logo_line(info, rotate, fb_logo.logo, 0, count); 694 y = fb_show_extra_logos(info, y, rotate); 695 696 return y; 697 } 698 #else 699 int fb_prepare_logo(struct fb_info *info, int rotate) { return 0; } 700 int fb_show_logo(struct fb_info *info, int rotate) { return 0; } 701 #endif /* CONFIG_LOGO */ 702 EXPORT_SYMBOL(fb_prepare_logo); 703 EXPORT_SYMBOL(fb_show_logo); 704 705 int 706 fb_pan_display(struct fb_info *info, struct fb_var_screeninfo *var) 707 { 708 struct fb_fix_screeninfo *fix = &info->fix; 709 unsigned int yres = info->var.yres; 710 int err = 0; 711 712 if (var->yoffset > 0) { 713 if (var->vmode & FB_VMODE_YWRAP) { 714 if (!fix->ywrapstep || (var->yoffset % fix->ywrapstep)) 715 err = -EINVAL; 716 else 717 yres = 0; 718 } else if (!fix->ypanstep || (var->yoffset % fix->ypanstep)) 719 err = -EINVAL; 720 } 721 722 if (var->xoffset > 0 && (!fix->xpanstep || 723 (var->xoffset % fix->xpanstep))) 724 err = -EINVAL; 725 726 if (err || !info->fbops->fb_pan_display || 727 var->yoffset > info->var.yres_virtual - yres || 728 var->xoffset > info->var.xres_virtual - info->var.xres) 729 return -EINVAL; 730 731 if ((err = info->fbops->fb_pan_display(var, info))) 732 return err; 733 info->var.xoffset = var->xoffset; 734 info->var.yoffset = var->yoffset; 735 if (var->vmode & FB_VMODE_YWRAP) 736 info->var.vmode |= FB_VMODE_YWRAP; 737 else 738 info->var.vmode &= ~FB_VMODE_YWRAP; 739 return 0; 740 } 741 EXPORT_SYMBOL(fb_pan_display); 742 743 static int fb_check_caps(struct fb_info *info, struct fb_var_screeninfo *var, 744 u32 activate) 745 { 746 struct fb_blit_caps caps, fbcaps; 747 int err = 0; 748 749 memset(&caps, 0, sizeof(caps)); 750 memset(&fbcaps, 0, sizeof(fbcaps)); 751 caps.flags = (activate & FB_ACTIVATE_ALL) ? 1 : 0; 752 fbcon_get_requirement(info, &caps); 753 info->fbops->fb_get_caps(info, &fbcaps, var); 754 755 if (((fbcaps.x ^ caps.x) & caps.x) || 756 ((fbcaps.y ^ caps.y) & caps.y) || 757 (fbcaps.len < caps.len)) 758 err = -EINVAL; 759 760 return err; 761 } 762 763 int 764 fb_set_var(struct fb_info *info, struct fb_var_screeninfo *var) 765 { 766 int ret = 0; 767 u32 activate; 768 struct fb_var_screeninfo old_var; 769 struct fb_videomode mode; 770 struct fb_event event; 771 u32 unused; 772 773 if (var->activate & FB_ACTIVATE_INV_MODE) { 774 struct fb_videomode mode1, mode2; 775 776 fb_var_to_videomode(&mode1, var); 777 fb_var_to_videomode(&mode2, &info->var); 778 /* make sure we don't delete the videomode of current var */ 779 ret = fb_mode_is_equal(&mode1, &mode2); 780 if (!ret) { 781 ret = fbcon_mode_deleted(info, &mode1); 782 if (!ret) 783 fb_delete_videomode(&mode1, &info->modelist); 784 } 785 786 return ret ? -EINVAL : 0; 787 } 788 789 if (!(var->activate & FB_ACTIVATE_FORCE) && 790 !memcmp(&info->var, var, sizeof(struct fb_var_screeninfo))) 791 return 0; 792 793 activate = var->activate; 794 795 /* When using FOURCC mode, make sure the red, green, blue and 796 * transp fields are set to 0. 797 */ 798 if ((info->fix.capabilities & FB_CAP_FOURCC) && 799 var->grayscale > 1) { 800 if (var->red.offset || var->green.offset || 801 var->blue.offset || var->transp.offset || 802 var->red.length || var->green.length || 803 var->blue.length || var->transp.length || 804 var->red.msb_right || var->green.msb_right || 805 var->blue.msb_right || var->transp.msb_right) 806 return -EINVAL; 807 } 808 809 if (!info->fbops->fb_check_var) { 810 *var = info->var; 811 return 0; 812 } 813 814 /* bitfill_aligned() assumes that it's at least 8x8 */ 815 if (var->xres < 8 || var->yres < 8) 816 return -EINVAL; 817 818 /* Too huge resolution causes multiplication overflow. */ 819 if (check_mul_overflow(var->xres, var->yres, &unused) || 820 check_mul_overflow(var->xres_virtual, var->yres_virtual, &unused)) 821 return -EINVAL; 822 823 ret = info->fbops->fb_check_var(var, info); 824 825 if (ret) 826 return ret; 827 828 /* verify that virtual resolution >= physical resolution */ 829 if (var->xres_virtual < var->xres || 830 var->yres_virtual < var->yres) { 831 pr_warn("WARNING: fbcon: Driver '%s' missed to adjust virtual screen size (%ux%u vs. %ux%u)\n", 832 info->fix.id, 833 var->xres_virtual, var->yres_virtual, 834 var->xres, var->yres); 835 return -EINVAL; 836 } 837 838 if ((var->activate & FB_ACTIVATE_MASK) != FB_ACTIVATE_NOW) 839 return 0; 840 841 if (info->fbops->fb_get_caps) { 842 ret = fb_check_caps(info, var, activate); 843 844 if (ret) 845 return ret; 846 } 847 848 old_var = info->var; 849 info->var = *var; 850 851 if (info->fbops->fb_set_par) { 852 ret = info->fbops->fb_set_par(info); 853 854 if (ret) { 855 info->var = old_var; 856 printk(KERN_WARNING "detected " 857 "fb_set_par error, " 858 "error code: %d\n", ret); 859 return ret; 860 } 861 } 862 863 fb_pan_display(info, &info->var); 864 fb_set_cmap(&info->cmap, info); 865 fb_var_to_videomode(&mode, &info->var); 866 867 if (info->modelist.prev && info->modelist.next && 868 !list_empty(&info->modelist)) 869 ret = fb_add_videomode(&mode, &info->modelist); 870 871 if (ret) 872 return ret; 873 874 event.info = info; 875 event.data = &mode; 876 fb_notifier_call_chain(FB_EVENT_MODE_CHANGE, &event); 877 878 return 0; 879 } 880 EXPORT_SYMBOL(fb_set_var); 881 882 int 883 fb_blank(struct fb_info *info, int blank) 884 { 885 struct fb_event event; 886 int ret = -EINVAL; 887 888 if (blank > FB_BLANK_POWERDOWN) 889 blank = FB_BLANK_POWERDOWN; 890 891 event.info = info; 892 event.data = ␣ 893 894 if (info->fbops->fb_blank) 895 ret = info->fbops->fb_blank(blank, info); 896 897 if (!ret) 898 fb_notifier_call_chain(FB_EVENT_BLANK, &event); 899 900 return ret; 901 } 902 EXPORT_SYMBOL(fb_blank); 903 904 static int fb_check_foreignness(struct fb_info *fi) 905 { 906 const bool foreign_endian = fi->flags & FBINFO_FOREIGN_ENDIAN; 907 908 fi->flags &= ~FBINFO_FOREIGN_ENDIAN; 909 910 #ifdef __BIG_ENDIAN 911 fi->flags |= foreign_endian ? 0 : FBINFO_BE_MATH; 912 #else 913 fi->flags |= foreign_endian ? FBINFO_BE_MATH : 0; 914 #endif /* __BIG_ENDIAN */ 915 916 if (fi->flags & FBINFO_BE_MATH && !fb_be_math(fi)) { 917 pr_err("%s: enable CONFIG_FB_BIG_ENDIAN to " 918 "support this framebuffer\n", fi->fix.id); 919 return -ENOSYS; 920 } else if (!(fi->flags & FBINFO_BE_MATH) && fb_be_math(fi)) { 921 pr_err("%s: enable CONFIG_FB_LITTLE_ENDIAN to " 922 "support this framebuffer\n", fi->fix.id); 923 return -ENOSYS; 924 } 925 926 return 0; 927 } 928 929 static int do_register_framebuffer(struct fb_info *fb_info) 930 { 931 int i; 932 struct fb_videomode mode; 933 934 if (fb_check_foreignness(fb_info)) 935 return -ENOSYS; 936 937 if (num_registered_fb == FB_MAX) 938 return -ENXIO; 939 940 num_registered_fb++; 941 for (i = 0 ; i < FB_MAX; i++) 942 if (!registered_fb[i]) 943 break; 944 fb_info->node = i; 945 refcount_set(&fb_info->count, 1); 946 mutex_init(&fb_info->lock); 947 mutex_init(&fb_info->mm_lock); 948 949 fb_device_create(fb_info); 950 951 if (fb_info->pixmap.addr == NULL) { 952 fb_info->pixmap.addr = kmalloc(FBPIXMAPSIZE, GFP_KERNEL); 953 if (fb_info->pixmap.addr) { 954 fb_info->pixmap.size = FBPIXMAPSIZE; 955 fb_info->pixmap.buf_align = 1; 956 fb_info->pixmap.scan_align = 1; 957 fb_info->pixmap.access_align = 32; 958 fb_info->pixmap.flags = FB_PIXMAP_DEFAULT; 959 } 960 } 961 fb_info->pixmap.offset = 0; 962 963 if (!fb_info->pixmap.blit_x) 964 fb_info->pixmap.blit_x = ~(u32)0; 965 966 if (!fb_info->pixmap.blit_y) 967 fb_info->pixmap.blit_y = ~(u32)0; 968 969 if (!fb_info->modelist.prev || !fb_info->modelist.next) 970 INIT_LIST_HEAD(&fb_info->modelist); 971 972 if (fb_info->skip_vt_switch) 973 pm_vt_switch_required(fb_info->device, false); 974 else 975 pm_vt_switch_required(fb_info->device, true); 976 977 fb_var_to_videomode(&mode, &fb_info->var); 978 fb_add_videomode(&mode, &fb_info->modelist); 979 registered_fb[i] = fb_info; 980 981 #ifdef CONFIG_GUMSTIX_AM200EPD 982 { 983 struct fb_event event; 984 event.info = fb_info; 985 fb_notifier_call_chain(FB_EVENT_FB_REGISTERED, &event); 986 } 987 #endif 988 989 return fbcon_fb_registered(fb_info); 990 } 991 992 static void unbind_console(struct fb_info *fb_info) 993 { 994 int i = fb_info->node; 995 996 if (WARN_ON(i < 0 || i >= FB_MAX || registered_fb[i] != fb_info)) 997 return; 998 999 fbcon_fb_unbind(fb_info); 1000 } 1001 1002 static void unlink_framebuffer(struct fb_info *fb_info) 1003 { 1004 int i; 1005 1006 i = fb_info->node; 1007 if (WARN_ON(i < 0 || i >= FB_MAX || registered_fb[i] != fb_info)) 1008 return; 1009 1010 fb_device_destroy(fb_info); 1011 pm_vt_switch_unregister(fb_info->device); 1012 unbind_console(fb_info); 1013 } 1014 1015 static void do_unregister_framebuffer(struct fb_info *fb_info) 1016 { 1017 unlink_framebuffer(fb_info); 1018 if (fb_info->pixmap.addr && 1019 (fb_info->pixmap.flags & FB_PIXMAP_DEFAULT)) { 1020 kfree(fb_info->pixmap.addr); 1021 fb_info->pixmap.addr = NULL; 1022 } 1023 1024 fb_destroy_modelist(&fb_info->modelist); 1025 registered_fb[fb_info->node] = NULL; 1026 num_registered_fb--; 1027 #ifdef CONFIG_GUMSTIX_AM200EPD 1028 { 1029 struct fb_event event; 1030 event.info = fb_info; 1031 fb_notifier_call_chain(FB_EVENT_FB_UNREGISTERED, &event); 1032 } 1033 #endif 1034 fbcon_fb_unregistered(fb_info); 1035 1036 /* this may free fb info */ 1037 put_fb_info(fb_info); 1038 } 1039 1040 /** 1041 * register_framebuffer - registers a frame buffer device 1042 * @fb_info: frame buffer info structure 1043 * 1044 * Registers a frame buffer device @fb_info. 1045 * 1046 * Returns negative errno on error, or zero for success. 1047 * 1048 */ 1049 int 1050 register_framebuffer(struct fb_info *fb_info) 1051 { 1052 int ret; 1053 1054 mutex_lock(®istration_lock); 1055 ret = do_register_framebuffer(fb_info); 1056 mutex_unlock(®istration_lock); 1057 1058 return ret; 1059 } 1060 EXPORT_SYMBOL(register_framebuffer); 1061 1062 /** 1063 * unregister_framebuffer - releases a frame buffer device 1064 * @fb_info: frame buffer info structure 1065 * 1066 * Unregisters a frame buffer device @fb_info. 1067 * 1068 * Returns negative errno on error, or zero for success. 1069 * 1070 * This function will also notify the framebuffer console 1071 * to release the driver. 1072 * 1073 * This is meant to be called within a driver's module_exit() 1074 * function. If this is called outside module_exit(), ensure 1075 * that the driver implements fb_open() and fb_release() to 1076 * check that no processes are using the device. 1077 */ 1078 void 1079 unregister_framebuffer(struct fb_info *fb_info) 1080 { 1081 mutex_lock(®istration_lock); 1082 do_unregister_framebuffer(fb_info); 1083 mutex_unlock(®istration_lock); 1084 } 1085 EXPORT_SYMBOL(unregister_framebuffer); 1086 1087 /** 1088 * fb_set_suspend - low level driver signals suspend 1089 * @info: framebuffer affected 1090 * @state: 0 = resuming, !=0 = suspending 1091 * 1092 * This is meant to be used by low level drivers to 1093 * signal suspend/resume to the core & clients. 1094 * It must be called with the console semaphore held 1095 */ 1096 void fb_set_suspend(struct fb_info *info, int state) 1097 { 1098 WARN_CONSOLE_UNLOCKED(); 1099 1100 if (state) { 1101 fbcon_suspended(info); 1102 info->state = FBINFO_STATE_SUSPENDED; 1103 } else { 1104 info->state = FBINFO_STATE_RUNNING; 1105 fbcon_resumed(info); 1106 } 1107 } 1108 EXPORT_SYMBOL(fb_set_suspend); 1109 1110 static int __init fbmem_init(void) 1111 { 1112 int ret; 1113 1114 fb_class = class_create("graphics"); 1115 if (IS_ERR(fb_class)) { 1116 ret = PTR_ERR(fb_class); 1117 pr_err("Unable to create fb class; errno = %d\n", ret); 1118 goto err_fb_class; 1119 } 1120 1121 ret = fb_init_procfs(); 1122 if (ret) 1123 goto err_class_destroy; 1124 1125 ret = fb_register_chrdev(); 1126 if (ret) 1127 goto err_fb_cleanup_procfs; 1128 1129 fb_console_init(); 1130 1131 return 0; 1132 1133 err_fb_cleanup_procfs: 1134 fb_cleanup_procfs(); 1135 err_class_destroy: 1136 class_destroy(fb_class); 1137 err_fb_class: 1138 fb_class = NULL; 1139 return ret; 1140 } 1141 1142 #ifdef MODULE 1143 static void __exit fbmem_exit(void) 1144 { 1145 fb_console_exit(); 1146 fb_unregister_chrdev(); 1147 fb_cleanup_procfs(); 1148 class_destroy(fb_class); 1149 } 1150 1151 module_init(fbmem_init); 1152 module_exit(fbmem_exit); 1153 MODULE_LICENSE("GPL"); 1154 MODULE_DESCRIPTION("Framebuffer base"); 1155 #else 1156 subsys_initcall(fbmem_init); 1157 #endif 1158 1159 int fb_new_modelist(struct fb_info *info) 1160 { 1161 struct fb_var_screeninfo var = info->var; 1162 struct list_head *pos, *n; 1163 struct fb_modelist *modelist; 1164 struct fb_videomode *m, mode; 1165 int err; 1166 1167 list_for_each_safe(pos, n, &info->modelist) { 1168 modelist = list_entry(pos, struct fb_modelist, list); 1169 m = &modelist->mode; 1170 fb_videomode_to_var(&var, m); 1171 var.activate = FB_ACTIVATE_TEST; 1172 err = fb_set_var(info, &var); 1173 fb_var_to_videomode(&mode, &var); 1174 if (err || !fb_mode_is_equal(m, &mode)) { 1175 list_del(pos); 1176 kfree(pos); 1177 } 1178 } 1179 1180 if (list_empty(&info->modelist)) 1181 return 1; 1182 1183 fbcon_new_modelist(info); 1184 1185 return 0; 1186 } 1187 1188 #if defined(CONFIG_VIDEO_NOMODESET) 1189 bool fb_modesetting_disabled(const char *drvname) 1190 { 1191 bool fwonly = video_firmware_drivers_only(); 1192 1193 if (fwonly) 1194 pr_warn("Driver %s not loading because of nomodeset parameter\n", 1195 drvname); 1196 1197 return fwonly; 1198 } 1199 EXPORT_SYMBOL(fb_modesetting_disabled); 1200 #endif 1201 1202 MODULE_LICENSE("GPL"); 1203