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/compat.h> 17 #include <linux/types.h> 18 #include <linux/errno.h> 19 #include <linux/kernel.h> 20 #include <linux/major.h> 21 #include <linux/slab.h> 22 #include <linux/mm.h> 23 #include <linux/mman.h> 24 #include <linux/vt.h> 25 #include <linux/init.h> 26 #include <linux/linux_logo.h> 27 #include <linux/proc_fs.h> 28 #include <linux/platform_device.h> 29 #include <linux/seq_file.h> 30 #include <linux/console.h> 31 #include <linux/kmod.h> 32 #include <linux/err.h> 33 #include <linux/device.h> 34 #include <linux/efi.h> 35 #include <linux/fb.h> 36 #include <linux/fbcon.h> 37 #include <linux/mem_encrypt.h> 38 #include <linux/pci.h> 39 40 #include <video/nomodeset.h> 41 #include <video/vga.h> 42 43 /* 44 * Frame buffer device initialization and setup routines 45 */ 46 47 #define FBPIXMAPSIZE (1024 * 8) 48 49 static DEFINE_MUTEX(registration_lock); 50 51 struct fb_info *registered_fb[FB_MAX] __read_mostly; 52 int num_registered_fb __read_mostly; 53 #define for_each_registered_fb(i) \ 54 for (i = 0; i < FB_MAX; i++) \ 55 if (!registered_fb[i]) {} else 56 57 bool fb_center_logo __read_mostly; 58 59 int fb_logo_count __read_mostly = -1; 60 61 static struct fb_info *get_fb_info(unsigned int idx) 62 { 63 struct fb_info *fb_info; 64 65 if (idx >= FB_MAX) 66 return ERR_PTR(-ENODEV); 67 68 mutex_lock(®istration_lock); 69 fb_info = registered_fb[idx]; 70 if (fb_info) 71 refcount_inc(&fb_info->count); 72 mutex_unlock(®istration_lock); 73 74 return fb_info; 75 } 76 77 static void put_fb_info(struct fb_info *fb_info) 78 { 79 if (!refcount_dec_and_test(&fb_info->count)) 80 return; 81 if (fb_info->fbops->fb_destroy) 82 fb_info->fbops->fb_destroy(fb_info); 83 } 84 85 /* 86 * Helpers 87 */ 88 89 int fb_get_color_depth(struct fb_var_screeninfo *var, 90 struct fb_fix_screeninfo *fix) 91 { 92 int depth = 0; 93 94 if (fix->visual == FB_VISUAL_MONO01 || 95 fix->visual == FB_VISUAL_MONO10) 96 depth = 1; 97 else { 98 if (var->green.length == var->blue.length && 99 var->green.length == var->red.length && 100 var->green.offset == var->blue.offset && 101 var->green.offset == var->red.offset) 102 depth = var->green.length; 103 else 104 depth = var->green.length + var->red.length + 105 var->blue.length; 106 } 107 108 return depth; 109 } 110 EXPORT_SYMBOL(fb_get_color_depth); 111 112 /* 113 * Data padding functions. 114 */ 115 void fb_pad_aligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 s_pitch, u32 height) 116 { 117 __fb_pad_aligned_buffer(dst, d_pitch, src, s_pitch, height); 118 } 119 EXPORT_SYMBOL(fb_pad_aligned_buffer); 120 121 void fb_pad_unaligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 idx, u32 height, 122 u32 shift_high, u32 shift_low, u32 mod) 123 { 124 u8 mask = (u8) (0xfff << shift_high), tmp; 125 int i, j; 126 127 for (i = height; i--; ) { 128 for (j = 0; j < idx; j++) { 129 tmp = dst[j]; 130 tmp &= mask; 131 tmp |= *src >> shift_low; 132 dst[j] = tmp; 133 tmp = *src << shift_high; 134 dst[j+1] = tmp; 135 src++; 136 } 137 tmp = dst[idx]; 138 tmp &= mask; 139 tmp |= *src >> shift_low; 140 dst[idx] = tmp; 141 if (shift_high < mod) { 142 tmp = *src << shift_high; 143 dst[idx+1] = tmp; 144 } 145 src++; 146 dst += d_pitch; 147 } 148 } 149 EXPORT_SYMBOL(fb_pad_unaligned_buffer); 150 151 /* 152 * we need to lock this section since fb_cursor 153 * may use fb_imageblit() 154 */ 155 char* fb_get_buffer_offset(struct fb_info *info, struct fb_pixmap *buf, u32 size) 156 { 157 u32 align = buf->buf_align - 1, offset; 158 char *addr = buf->addr; 159 160 /* If IO mapped, we need to sync before access, no sharing of 161 * the pixmap is done 162 */ 163 if (buf->flags & FB_PIXMAP_IO) { 164 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC)) 165 info->fbops->fb_sync(info); 166 return addr; 167 } 168 169 /* See if we fit in the remaining pixmap space */ 170 offset = buf->offset + align; 171 offset &= ~align; 172 if (offset + size > buf->size) { 173 /* We do not fit. In order to be able to re-use the buffer, 174 * we must ensure no asynchronous DMA'ing or whatever operation 175 * is in progress, we sync for that. 176 */ 177 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC)) 178 info->fbops->fb_sync(info); 179 offset = 0; 180 } 181 buf->offset = offset + size; 182 addr += offset; 183 184 return addr; 185 } 186 EXPORT_SYMBOL(fb_get_buffer_offset); 187 188 #ifdef CONFIG_LOGO 189 190 static inline unsigned safe_shift(unsigned d, int n) 191 { 192 return n < 0 ? d >> -n : d << n; 193 } 194 195 static void fb_set_logocmap(struct fb_info *info, 196 const struct linux_logo *logo) 197 { 198 struct fb_cmap palette_cmap; 199 u16 palette_green[16]; 200 u16 palette_blue[16]; 201 u16 palette_red[16]; 202 int i, j, n; 203 const unsigned char *clut = logo->clut; 204 205 palette_cmap.start = 0; 206 palette_cmap.len = 16; 207 palette_cmap.red = palette_red; 208 palette_cmap.green = palette_green; 209 palette_cmap.blue = palette_blue; 210 palette_cmap.transp = NULL; 211 212 for (i = 0; i < logo->clutsize; i += n) { 213 n = logo->clutsize - i; 214 /* palette_cmap provides space for only 16 colors at once */ 215 if (n > 16) 216 n = 16; 217 palette_cmap.start = 32 + i; 218 palette_cmap.len = n; 219 for (j = 0; j < n; ++j) { 220 palette_cmap.red[j] = clut[0] << 8 | clut[0]; 221 palette_cmap.green[j] = clut[1] << 8 | clut[1]; 222 palette_cmap.blue[j] = clut[2] << 8 | clut[2]; 223 clut += 3; 224 } 225 fb_set_cmap(&palette_cmap, info); 226 } 227 } 228 229 static void fb_set_logo_truepalette(struct fb_info *info, 230 const struct linux_logo *logo, 231 u32 *palette) 232 { 233 static const unsigned char mask[] = { 0,0x80,0xc0,0xe0,0xf0,0xf8,0xfc,0xfe,0xff }; 234 unsigned char redmask, greenmask, bluemask; 235 int redshift, greenshift, blueshift; 236 int i; 237 const unsigned char *clut = logo->clut; 238 239 /* 240 * We have to create a temporary palette since console palette is only 241 * 16 colors long. 242 */ 243 /* Bug: Doesn't obey msb_right ... (who needs that?) */ 244 redmask = mask[info->var.red.length < 8 ? info->var.red.length : 8]; 245 greenmask = mask[info->var.green.length < 8 ? info->var.green.length : 8]; 246 bluemask = mask[info->var.blue.length < 8 ? info->var.blue.length : 8]; 247 redshift = info->var.red.offset - (8 - info->var.red.length); 248 greenshift = info->var.green.offset - (8 - info->var.green.length); 249 blueshift = info->var.blue.offset - (8 - info->var.blue.length); 250 251 for ( i = 0; i < logo->clutsize; i++) { 252 palette[i+32] = (safe_shift((clut[0] & redmask), redshift) | 253 safe_shift((clut[1] & greenmask), greenshift) | 254 safe_shift((clut[2] & bluemask), blueshift)); 255 clut += 3; 256 } 257 } 258 259 static void fb_set_logo_directpalette(struct fb_info *info, 260 const struct linux_logo *logo, 261 u32 *palette) 262 { 263 int redshift, greenshift, blueshift; 264 int i; 265 266 redshift = info->var.red.offset; 267 greenshift = info->var.green.offset; 268 blueshift = info->var.blue.offset; 269 270 for (i = 32; i < 32 + logo->clutsize; i++) 271 palette[i] = i << redshift | i << greenshift | i << blueshift; 272 } 273 274 static void fb_set_logo(struct fb_info *info, 275 const struct linux_logo *logo, u8 *dst, 276 int depth) 277 { 278 int i, j, k; 279 const u8 *src = logo->data; 280 u8 xor = (info->fix.visual == FB_VISUAL_MONO01) ? 0xff : 0; 281 u8 fg = 1, d; 282 283 switch (fb_get_color_depth(&info->var, &info->fix)) { 284 case 1: 285 fg = 1; 286 break; 287 case 2: 288 fg = 3; 289 break; 290 default: 291 fg = 7; 292 break; 293 } 294 295 if (info->fix.visual == FB_VISUAL_MONO01 || 296 info->fix.visual == FB_VISUAL_MONO10) 297 fg = ~((u8) (0xfff << info->var.green.length)); 298 299 switch (depth) { 300 case 4: 301 for (i = 0; i < logo->height; i++) 302 for (j = 0; j < logo->width; src++) { 303 *dst++ = *src >> 4; 304 j++; 305 if (j < logo->width) { 306 *dst++ = *src & 0x0f; 307 j++; 308 } 309 } 310 break; 311 case 1: 312 for (i = 0; i < logo->height; i++) { 313 for (j = 0; j < logo->width; src++) { 314 d = *src ^ xor; 315 for (k = 7; k >= 0 && j < logo->width; k--) { 316 *dst++ = ((d >> k) & 1) ? fg : 0; 317 j++; 318 } 319 } 320 } 321 break; 322 } 323 } 324 325 /* 326 * Three (3) kinds of logo maps exist. linux_logo_clut224 (>16 colors), 327 * linux_logo_vga16 (16 colors) and linux_logo_mono (2 colors). Depending on 328 * the visual format and color depth of the framebuffer, the DAC, the 329 * pseudo_palette, and the logo data will be adjusted accordingly. 330 * 331 * Case 1 - linux_logo_clut224: 332 * Color exceeds the number of console colors (16), thus we set the hardware DAC 333 * using fb_set_cmap() appropriately. The "needs_cmapreset" flag will be set. 334 * 335 * For visuals that require color info from the pseudo_palette, we also construct 336 * one for temporary use. The "needs_directpalette" or "needs_truepalette" flags 337 * will be set. 338 * 339 * Case 2 - linux_logo_vga16: 340 * The number of colors just matches the console colors, thus there is no need 341 * to set the DAC or the pseudo_palette. However, the bitmap is packed, ie, 342 * each byte contains color information for two pixels (upper and lower nibble). 343 * To be consistent with fb_imageblit() usage, we therefore separate the two 344 * nibbles into separate bytes. The "depth" flag will be set to 4. 345 * 346 * Case 3 - linux_logo_mono: 347 * This is similar with Case 2. Each byte contains information for 8 pixels. 348 * We isolate each bit and expand each into a byte. The "depth" flag will 349 * be set to 1. 350 */ 351 static struct logo_data { 352 int depth; 353 int needs_directpalette; 354 int needs_truepalette; 355 int needs_cmapreset; 356 const struct linux_logo *logo; 357 } fb_logo __read_mostly; 358 359 static void fb_rotate_logo_ud(const u8 *in, u8 *out, u32 width, u32 height) 360 { 361 u32 size = width * height, i; 362 363 out += size - 1; 364 365 for (i = size; i--; ) 366 *out-- = *in++; 367 } 368 369 static void fb_rotate_logo_cw(const u8 *in, u8 *out, u32 width, u32 height) 370 { 371 int i, j, h = height - 1; 372 373 for (i = 0; i < height; i++) 374 for (j = 0; j < width; j++) 375 out[height * j + h - i] = *in++; 376 } 377 378 static void fb_rotate_logo_ccw(const u8 *in, u8 *out, u32 width, u32 height) 379 { 380 int i, j, w = width - 1; 381 382 for (i = 0; i < height; i++) 383 for (j = 0; j < width; j++) 384 out[height * (w - j) + i] = *in++; 385 } 386 387 static void fb_rotate_logo(struct fb_info *info, u8 *dst, 388 struct fb_image *image, int rotate) 389 { 390 u32 tmp; 391 392 if (rotate == FB_ROTATE_UD) { 393 fb_rotate_logo_ud(image->data, dst, image->width, 394 image->height); 395 image->dx = info->var.xres - image->width - image->dx; 396 image->dy = info->var.yres - image->height - image->dy; 397 } else if (rotate == FB_ROTATE_CW) { 398 fb_rotate_logo_cw(image->data, dst, image->width, 399 image->height); 400 swap(image->width, image->height); 401 tmp = image->dy; 402 image->dy = image->dx; 403 image->dx = info->var.xres - image->width - tmp; 404 } else if (rotate == FB_ROTATE_CCW) { 405 fb_rotate_logo_ccw(image->data, dst, image->width, 406 image->height); 407 swap(image->width, image->height); 408 tmp = image->dx; 409 image->dx = image->dy; 410 image->dy = info->var.yres - image->height - tmp; 411 } 412 413 image->data = dst; 414 } 415 416 static void fb_do_show_logo(struct fb_info *info, struct fb_image *image, 417 int rotate, unsigned int num) 418 { 419 unsigned int x; 420 421 if (image->width > info->var.xres || image->height > info->var.yres) 422 return; 423 424 if (rotate == FB_ROTATE_UR) { 425 for (x = 0; 426 x < num && image->dx + image->width <= info->var.xres; 427 x++) { 428 info->fbops->fb_imageblit(info, image); 429 image->dx += image->width + 8; 430 } 431 } else if (rotate == FB_ROTATE_UD) { 432 u32 dx = image->dx; 433 434 for (x = 0; x < num && image->dx <= dx; x++) { 435 info->fbops->fb_imageblit(info, image); 436 image->dx -= image->width + 8; 437 } 438 } else if (rotate == FB_ROTATE_CW) { 439 for (x = 0; 440 x < num && image->dy + image->height <= info->var.yres; 441 x++) { 442 info->fbops->fb_imageblit(info, image); 443 image->dy += image->height + 8; 444 } 445 } else if (rotate == FB_ROTATE_CCW) { 446 u32 dy = image->dy; 447 448 for (x = 0; x < num && image->dy <= dy; x++) { 449 info->fbops->fb_imageblit(info, image); 450 image->dy -= image->height + 8; 451 } 452 } 453 } 454 455 static int fb_show_logo_line(struct fb_info *info, int rotate, 456 const struct linux_logo *logo, int y, 457 unsigned int n) 458 { 459 u32 *palette = NULL, *saved_pseudo_palette = NULL; 460 unsigned char *logo_new = NULL, *logo_rotate = NULL; 461 struct fb_image image; 462 463 /* Return if the frame buffer is not mapped or suspended */ 464 if (logo == NULL || info->state != FBINFO_STATE_RUNNING || 465 info->fbops->owner) 466 return 0; 467 468 image.depth = 8; 469 image.data = logo->data; 470 471 if (fb_logo.needs_cmapreset) 472 fb_set_logocmap(info, logo); 473 474 if (fb_logo.needs_truepalette || 475 fb_logo.needs_directpalette) { 476 palette = kmalloc(256 * 4, GFP_KERNEL); 477 if (palette == NULL) 478 return 0; 479 480 if (fb_logo.needs_truepalette) 481 fb_set_logo_truepalette(info, logo, palette); 482 else 483 fb_set_logo_directpalette(info, logo, palette); 484 485 saved_pseudo_palette = info->pseudo_palette; 486 info->pseudo_palette = palette; 487 } 488 489 if (fb_logo.depth <= 4) { 490 logo_new = kmalloc_array(logo->width, logo->height, 491 GFP_KERNEL); 492 if (logo_new == NULL) { 493 kfree(palette); 494 if (saved_pseudo_palette) 495 info->pseudo_palette = saved_pseudo_palette; 496 return 0; 497 } 498 image.data = logo_new; 499 fb_set_logo(info, logo, logo_new, fb_logo.depth); 500 } 501 502 if (fb_center_logo) { 503 int xres = info->var.xres; 504 int yres = info->var.yres; 505 506 if (rotate == FB_ROTATE_CW || rotate == FB_ROTATE_CCW) { 507 xres = info->var.yres; 508 yres = info->var.xres; 509 } 510 511 while (n && (n * (logo->width + 8) - 8 > xres)) 512 --n; 513 image.dx = (xres - (n * (logo->width + 8) - 8)) / 2; 514 image.dy = y ?: (yres - logo->height) / 2; 515 } else { 516 image.dx = 0; 517 image.dy = y; 518 } 519 520 image.width = logo->width; 521 image.height = logo->height; 522 523 if (rotate) { 524 logo_rotate = kmalloc_array(logo->width, logo->height, 525 GFP_KERNEL); 526 if (logo_rotate) 527 fb_rotate_logo(info, logo_rotate, &image, rotate); 528 } 529 530 fb_do_show_logo(info, &image, rotate, n); 531 532 kfree(palette); 533 if (saved_pseudo_palette != NULL) 534 info->pseudo_palette = saved_pseudo_palette; 535 kfree(logo_new); 536 kfree(logo_rotate); 537 return image.dy + logo->height; 538 } 539 540 541 #ifdef CONFIG_FB_LOGO_EXTRA 542 543 #define FB_LOGO_EX_NUM_MAX 10 544 static struct logo_data_extra { 545 const struct linux_logo *logo; 546 unsigned int n; 547 } fb_logo_ex[FB_LOGO_EX_NUM_MAX]; 548 static unsigned int fb_logo_ex_num; 549 550 void fb_append_extra_logo(const struct linux_logo *logo, unsigned int n) 551 { 552 if (!n || fb_logo_ex_num == FB_LOGO_EX_NUM_MAX) 553 return; 554 555 fb_logo_ex[fb_logo_ex_num].logo = logo; 556 fb_logo_ex[fb_logo_ex_num].n = n; 557 fb_logo_ex_num++; 558 } 559 560 static int fb_prepare_extra_logos(struct fb_info *info, unsigned int height, 561 unsigned int yres) 562 { 563 unsigned int i; 564 565 /* FIXME: logo_ex supports only truecolor fb. */ 566 if (info->fix.visual != FB_VISUAL_TRUECOLOR) 567 fb_logo_ex_num = 0; 568 569 for (i = 0; i < fb_logo_ex_num; i++) { 570 if (fb_logo_ex[i].logo->type != fb_logo.logo->type) { 571 fb_logo_ex[i].logo = NULL; 572 continue; 573 } 574 height += fb_logo_ex[i].logo->height; 575 if (height > yres) { 576 height -= fb_logo_ex[i].logo->height; 577 fb_logo_ex_num = i; 578 break; 579 } 580 } 581 return height; 582 } 583 584 static int fb_show_extra_logos(struct fb_info *info, int y, int rotate) 585 { 586 unsigned int i; 587 588 for (i = 0; i < fb_logo_ex_num; i++) 589 y = fb_show_logo_line(info, rotate, 590 fb_logo_ex[i].logo, y, fb_logo_ex[i].n); 591 592 return y; 593 } 594 595 #else /* !CONFIG_FB_LOGO_EXTRA */ 596 597 static inline int fb_prepare_extra_logos(struct fb_info *info, 598 unsigned int height, 599 unsigned int yres) 600 { 601 return height; 602 } 603 604 static inline int fb_show_extra_logos(struct fb_info *info, int y, int rotate) 605 { 606 return y; 607 } 608 609 #endif /* CONFIG_FB_LOGO_EXTRA */ 610 611 612 int fb_prepare_logo(struct fb_info *info, int rotate) 613 { 614 int depth = fb_get_color_depth(&info->var, &info->fix); 615 unsigned int yres; 616 int height; 617 618 memset(&fb_logo, 0, sizeof(struct logo_data)); 619 620 if (info->flags & FBINFO_MISC_TILEBLITTING || 621 info->fbops->owner || !fb_logo_count) 622 return 0; 623 624 if (info->fix.visual == FB_VISUAL_DIRECTCOLOR) { 625 depth = info->var.blue.length; 626 if (info->var.red.length < depth) 627 depth = info->var.red.length; 628 if (info->var.green.length < depth) 629 depth = info->var.green.length; 630 } 631 632 if (info->fix.visual == FB_VISUAL_STATIC_PSEUDOCOLOR && depth > 4) { 633 /* assume console colormap */ 634 depth = 4; 635 } 636 637 /* Return if no suitable logo was found */ 638 fb_logo.logo = fb_find_logo(depth); 639 640 if (!fb_logo.logo) { 641 return 0; 642 } 643 644 if (rotate == FB_ROTATE_UR || rotate == FB_ROTATE_UD) 645 yres = info->var.yres; 646 else 647 yres = info->var.xres; 648 649 if (fb_logo.logo->height > yres) { 650 fb_logo.logo = NULL; 651 return 0; 652 } 653 654 /* What depth we asked for might be different from what we get */ 655 if (fb_logo.logo->type == LINUX_LOGO_CLUT224) 656 fb_logo.depth = 8; 657 else if (fb_logo.logo->type == LINUX_LOGO_VGA16) 658 fb_logo.depth = 4; 659 else 660 fb_logo.depth = 1; 661 662 663 if (fb_logo.depth > 4 && depth > 4) { 664 switch (info->fix.visual) { 665 case FB_VISUAL_TRUECOLOR: 666 fb_logo.needs_truepalette = 1; 667 break; 668 case FB_VISUAL_DIRECTCOLOR: 669 fb_logo.needs_directpalette = 1; 670 fb_logo.needs_cmapreset = 1; 671 break; 672 case FB_VISUAL_PSEUDOCOLOR: 673 fb_logo.needs_cmapreset = 1; 674 break; 675 } 676 } 677 678 height = fb_logo.logo->height; 679 if (fb_center_logo) 680 height += (yres - fb_logo.logo->height) / 2; 681 682 return fb_prepare_extra_logos(info, height, yres); 683 } 684 685 int fb_show_logo(struct fb_info *info, int rotate) 686 { 687 unsigned int count; 688 int y; 689 690 if (!fb_logo_count) 691 return 0; 692 693 count = fb_logo_count < 0 ? num_online_cpus() : fb_logo_count; 694 y = fb_show_logo_line(info, rotate, fb_logo.logo, 0, count); 695 y = fb_show_extra_logos(info, y, rotate); 696 697 return y; 698 } 699 #else 700 int fb_prepare_logo(struct fb_info *info, int rotate) { return 0; } 701 int fb_show_logo(struct fb_info *info, int rotate) { return 0; } 702 #endif /* CONFIG_LOGO */ 703 EXPORT_SYMBOL(fb_prepare_logo); 704 EXPORT_SYMBOL(fb_show_logo); 705 706 static void *fb_seq_start(struct seq_file *m, loff_t *pos) 707 { 708 mutex_lock(®istration_lock); 709 return (*pos < FB_MAX) ? pos : NULL; 710 } 711 712 static void *fb_seq_next(struct seq_file *m, void *v, loff_t *pos) 713 { 714 (*pos)++; 715 return (*pos < FB_MAX) ? pos : NULL; 716 } 717 718 static void fb_seq_stop(struct seq_file *m, void *v) 719 { 720 mutex_unlock(®istration_lock); 721 } 722 723 static int fb_seq_show(struct seq_file *m, void *v) 724 { 725 int i = *(loff_t *)v; 726 struct fb_info *fi = registered_fb[i]; 727 728 if (fi) 729 seq_printf(m, "%d %s\n", fi->node, fi->fix.id); 730 return 0; 731 } 732 733 static const struct seq_operations __maybe_unused proc_fb_seq_ops = { 734 .start = fb_seq_start, 735 .next = fb_seq_next, 736 .stop = fb_seq_stop, 737 .show = fb_seq_show, 738 }; 739 740 /* 741 * We hold a reference to the fb_info in file->private_data, 742 * but if the current registered fb has changed, we don't 743 * actually want to use it. 744 * 745 * So look up the fb_info using the inode minor number, 746 * and just verify it against the reference we have. 747 */ 748 static struct fb_info *file_fb_info(struct file *file) 749 { 750 struct inode *inode = file_inode(file); 751 int fbidx = iminor(inode); 752 struct fb_info *info = registered_fb[fbidx]; 753 754 if (info != file->private_data) 755 info = NULL; 756 return info; 757 } 758 759 static ssize_t 760 fb_read(struct file *file, char __user *buf, size_t count, loff_t *ppos) 761 { 762 struct fb_info *info = file_fb_info(file); 763 764 if (!info) 765 return -ENODEV; 766 767 if (info->state != FBINFO_STATE_RUNNING) 768 return -EPERM; 769 770 if (info->fbops->fb_read) 771 return info->fbops->fb_read(info, buf, count, ppos); 772 773 return fb_io_read(info, buf, count, ppos); 774 } 775 776 static ssize_t 777 fb_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos) 778 { 779 struct fb_info *info = file_fb_info(file); 780 781 if (!info) 782 return -ENODEV; 783 784 if (info->state != FBINFO_STATE_RUNNING) 785 return -EPERM; 786 787 if (info->fbops->fb_write) 788 return info->fbops->fb_write(info, buf, count, ppos); 789 790 return fb_io_write(info, buf, count, ppos); 791 } 792 793 int 794 fb_pan_display(struct fb_info *info, struct fb_var_screeninfo *var) 795 { 796 struct fb_fix_screeninfo *fix = &info->fix; 797 unsigned int yres = info->var.yres; 798 int err = 0; 799 800 if (var->yoffset > 0) { 801 if (var->vmode & FB_VMODE_YWRAP) { 802 if (!fix->ywrapstep || (var->yoffset % fix->ywrapstep)) 803 err = -EINVAL; 804 else 805 yres = 0; 806 } else if (!fix->ypanstep || (var->yoffset % fix->ypanstep)) 807 err = -EINVAL; 808 } 809 810 if (var->xoffset > 0 && (!fix->xpanstep || 811 (var->xoffset % fix->xpanstep))) 812 err = -EINVAL; 813 814 if (err || !info->fbops->fb_pan_display || 815 var->yoffset > info->var.yres_virtual - yres || 816 var->xoffset > info->var.xres_virtual - info->var.xres) 817 return -EINVAL; 818 819 if ((err = info->fbops->fb_pan_display(var, info))) 820 return err; 821 info->var.xoffset = var->xoffset; 822 info->var.yoffset = var->yoffset; 823 if (var->vmode & FB_VMODE_YWRAP) 824 info->var.vmode |= FB_VMODE_YWRAP; 825 else 826 info->var.vmode &= ~FB_VMODE_YWRAP; 827 return 0; 828 } 829 EXPORT_SYMBOL(fb_pan_display); 830 831 static int fb_check_caps(struct fb_info *info, struct fb_var_screeninfo *var, 832 u32 activate) 833 { 834 struct fb_blit_caps caps, fbcaps; 835 int err = 0; 836 837 memset(&caps, 0, sizeof(caps)); 838 memset(&fbcaps, 0, sizeof(fbcaps)); 839 caps.flags = (activate & FB_ACTIVATE_ALL) ? 1 : 0; 840 fbcon_get_requirement(info, &caps); 841 info->fbops->fb_get_caps(info, &fbcaps, var); 842 843 if (((fbcaps.x ^ caps.x) & caps.x) || 844 ((fbcaps.y ^ caps.y) & caps.y) || 845 (fbcaps.len < caps.len)) 846 err = -EINVAL; 847 848 return err; 849 } 850 851 int 852 fb_set_var(struct fb_info *info, struct fb_var_screeninfo *var) 853 { 854 int ret = 0; 855 u32 activate; 856 struct fb_var_screeninfo old_var; 857 struct fb_videomode mode; 858 struct fb_event event; 859 u32 unused; 860 861 if (var->activate & FB_ACTIVATE_INV_MODE) { 862 struct fb_videomode mode1, mode2; 863 864 fb_var_to_videomode(&mode1, var); 865 fb_var_to_videomode(&mode2, &info->var); 866 /* make sure we don't delete the videomode of current var */ 867 ret = fb_mode_is_equal(&mode1, &mode2); 868 if (!ret) { 869 ret = fbcon_mode_deleted(info, &mode1); 870 if (!ret) 871 fb_delete_videomode(&mode1, &info->modelist); 872 } 873 874 return ret ? -EINVAL : 0; 875 } 876 877 if (!(var->activate & FB_ACTIVATE_FORCE) && 878 !memcmp(&info->var, var, sizeof(struct fb_var_screeninfo))) 879 return 0; 880 881 activate = var->activate; 882 883 /* When using FOURCC mode, make sure the red, green, blue and 884 * transp fields are set to 0. 885 */ 886 if ((info->fix.capabilities & FB_CAP_FOURCC) && 887 var->grayscale > 1) { 888 if (var->red.offset || var->green.offset || 889 var->blue.offset || var->transp.offset || 890 var->red.length || var->green.length || 891 var->blue.length || var->transp.length || 892 var->red.msb_right || var->green.msb_right || 893 var->blue.msb_right || var->transp.msb_right) 894 return -EINVAL; 895 } 896 897 if (!info->fbops->fb_check_var) { 898 *var = info->var; 899 return 0; 900 } 901 902 /* bitfill_aligned() assumes that it's at least 8x8 */ 903 if (var->xres < 8 || var->yres < 8) 904 return -EINVAL; 905 906 /* Too huge resolution causes multiplication overflow. */ 907 if (check_mul_overflow(var->xres, var->yres, &unused) || 908 check_mul_overflow(var->xres_virtual, var->yres_virtual, &unused)) 909 return -EINVAL; 910 911 ret = info->fbops->fb_check_var(var, info); 912 913 if (ret) 914 return ret; 915 916 /* verify that virtual resolution >= physical resolution */ 917 if (var->xres_virtual < var->xres || 918 var->yres_virtual < var->yres) { 919 pr_warn("WARNING: fbcon: Driver '%s' missed to adjust virtual screen size (%ux%u vs. %ux%u)\n", 920 info->fix.id, 921 var->xres_virtual, var->yres_virtual, 922 var->xres, var->yres); 923 return -EINVAL; 924 } 925 926 if ((var->activate & FB_ACTIVATE_MASK) != FB_ACTIVATE_NOW) 927 return 0; 928 929 if (info->fbops->fb_get_caps) { 930 ret = fb_check_caps(info, var, activate); 931 932 if (ret) 933 return ret; 934 } 935 936 old_var = info->var; 937 info->var = *var; 938 939 if (info->fbops->fb_set_par) { 940 ret = info->fbops->fb_set_par(info); 941 942 if (ret) { 943 info->var = old_var; 944 printk(KERN_WARNING "detected " 945 "fb_set_par error, " 946 "error code: %d\n", ret); 947 return ret; 948 } 949 } 950 951 fb_pan_display(info, &info->var); 952 fb_set_cmap(&info->cmap, info); 953 fb_var_to_videomode(&mode, &info->var); 954 955 if (info->modelist.prev && info->modelist.next && 956 !list_empty(&info->modelist)) 957 ret = fb_add_videomode(&mode, &info->modelist); 958 959 if (ret) 960 return ret; 961 962 event.info = info; 963 event.data = &mode; 964 fb_notifier_call_chain(FB_EVENT_MODE_CHANGE, &event); 965 966 return 0; 967 } 968 EXPORT_SYMBOL(fb_set_var); 969 970 int 971 fb_blank(struct fb_info *info, int blank) 972 { 973 struct fb_event event; 974 int ret = -EINVAL; 975 976 if (blank > FB_BLANK_POWERDOWN) 977 blank = FB_BLANK_POWERDOWN; 978 979 event.info = info; 980 event.data = ␣ 981 982 if (info->fbops->fb_blank) 983 ret = info->fbops->fb_blank(blank, info); 984 985 if (!ret) 986 fb_notifier_call_chain(FB_EVENT_BLANK, &event); 987 988 return ret; 989 } 990 EXPORT_SYMBOL(fb_blank); 991 992 static long do_fb_ioctl(struct fb_info *info, unsigned int cmd, 993 unsigned long arg) 994 { 995 const struct fb_ops *fb; 996 struct fb_var_screeninfo var; 997 struct fb_fix_screeninfo fix; 998 struct fb_cmap cmap_from; 999 struct fb_cmap_user cmap; 1000 void __user *argp = (void __user *)arg; 1001 long ret = 0; 1002 1003 switch (cmd) { 1004 case FBIOGET_VSCREENINFO: 1005 lock_fb_info(info); 1006 var = info->var; 1007 unlock_fb_info(info); 1008 1009 ret = copy_to_user(argp, &var, sizeof(var)) ? -EFAULT : 0; 1010 break; 1011 case FBIOPUT_VSCREENINFO: 1012 if (copy_from_user(&var, argp, sizeof(var))) 1013 return -EFAULT; 1014 /* only for kernel-internal use */ 1015 var.activate &= ~FB_ACTIVATE_KD_TEXT; 1016 console_lock(); 1017 lock_fb_info(info); 1018 ret = fbcon_modechange_possible(info, &var); 1019 if (!ret) 1020 ret = fb_set_var(info, &var); 1021 if (!ret) 1022 fbcon_update_vcs(info, var.activate & FB_ACTIVATE_ALL); 1023 unlock_fb_info(info); 1024 console_unlock(); 1025 if (!ret && copy_to_user(argp, &var, sizeof(var))) 1026 ret = -EFAULT; 1027 break; 1028 case FBIOGET_FSCREENINFO: 1029 lock_fb_info(info); 1030 memcpy(&fix, &info->fix, sizeof(fix)); 1031 if (info->flags & FBINFO_HIDE_SMEM_START) 1032 fix.smem_start = 0; 1033 unlock_fb_info(info); 1034 1035 ret = copy_to_user(argp, &fix, sizeof(fix)) ? -EFAULT : 0; 1036 break; 1037 case FBIOPUTCMAP: 1038 if (copy_from_user(&cmap, argp, sizeof(cmap))) 1039 return -EFAULT; 1040 ret = fb_set_user_cmap(&cmap, info); 1041 break; 1042 case FBIOGETCMAP: 1043 if (copy_from_user(&cmap, argp, sizeof(cmap))) 1044 return -EFAULT; 1045 lock_fb_info(info); 1046 cmap_from = info->cmap; 1047 unlock_fb_info(info); 1048 ret = fb_cmap_to_user(&cmap_from, &cmap); 1049 break; 1050 case FBIOPAN_DISPLAY: 1051 if (copy_from_user(&var, argp, sizeof(var))) 1052 return -EFAULT; 1053 console_lock(); 1054 lock_fb_info(info); 1055 ret = fb_pan_display(info, &var); 1056 unlock_fb_info(info); 1057 console_unlock(); 1058 if (ret == 0 && copy_to_user(argp, &var, sizeof(var))) 1059 return -EFAULT; 1060 break; 1061 case FBIO_CURSOR: 1062 ret = -EINVAL; 1063 break; 1064 case FBIOGET_CON2FBMAP: 1065 ret = fbcon_get_con2fb_map_ioctl(argp); 1066 break; 1067 case FBIOPUT_CON2FBMAP: 1068 ret = fbcon_set_con2fb_map_ioctl(argp); 1069 break; 1070 case FBIOBLANK: 1071 if (arg > FB_BLANK_POWERDOWN) 1072 return -EINVAL; 1073 console_lock(); 1074 lock_fb_info(info); 1075 ret = fb_blank(info, arg); 1076 /* might again call into fb_blank */ 1077 fbcon_fb_blanked(info, arg); 1078 unlock_fb_info(info); 1079 console_unlock(); 1080 break; 1081 default: 1082 lock_fb_info(info); 1083 fb = info->fbops; 1084 if (fb->fb_ioctl) 1085 ret = fb->fb_ioctl(info, cmd, arg); 1086 else 1087 ret = -ENOTTY; 1088 unlock_fb_info(info); 1089 } 1090 return ret; 1091 } 1092 1093 static long fb_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 1094 { 1095 struct fb_info *info = file_fb_info(file); 1096 1097 if (!info) 1098 return -ENODEV; 1099 return do_fb_ioctl(info, cmd, arg); 1100 } 1101 1102 #ifdef CONFIG_COMPAT 1103 struct fb_fix_screeninfo32 { 1104 char id[16]; 1105 compat_caddr_t smem_start; 1106 u32 smem_len; 1107 u32 type; 1108 u32 type_aux; 1109 u32 visual; 1110 u16 xpanstep; 1111 u16 ypanstep; 1112 u16 ywrapstep; 1113 u32 line_length; 1114 compat_caddr_t mmio_start; 1115 u32 mmio_len; 1116 u32 accel; 1117 u16 reserved[3]; 1118 }; 1119 1120 struct fb_cmap32 { 1121 u32 start; 1122 u32 len; 1123 compat_caddr_t red; 1124 compat_caddr_t green; 1125 compat_caddr_t blue; 1126 compat_caddr_t transp; 1127 }; 1128 1129 static int fb_getput_cmap(struct fb_info *info, unsigned int cmd, 1130 unsigned long arg) 1131 { 1132 struct fb_cmap32 cmap32; 1133 struct fb_cmap cmap_from; 1134 struct fb_cmap_user cmap; 1135 1136 if (copy_from_user(&cmap32, compat_ptr(arg), sizeof(cmap32))) 1137 return -EFAULT; 1138 1139 cmap = (struct fb_cmap_user) { 1140 .start = cmap32.start, 1141 .len = cmap32.len, 1142 .red = compat_ptr(cmap32.red), 1143 .green = compat_ptr(cmap32.green), 1144 .blue = compat_ptr(cmap32.blue), 1145 .transp = compat_ptr(cmap32.transp), 1146 }; 1147 1148 if (cmd == FBIOPUTCMAP) 1149 return fb_set_user_cmap(&cmap, info); 1150 1151 lock_fb_info(info); 1152 cmap_from = info->cmap; 1153 unlock_fb_info(info); 1154 1155 return fb_cmap_to_user(&cmap_from, &cmap); 1156 } 1157 1158 static int do_fscreeninfo_to_user(struct fb_fix_screeninfo *fix, 1159 struct fb_fix_screeninfo32 __user *fix32) 1160 { 1161 __u32 data; 1162 int err; 1163 1164 err = copy_to_user(&fix32->id, &fix->id, sizeof(fix32->id)); 1165 1166 data = (__u32) (unsigned long) fix->smem_start; 1167 err |= put_user(data, &fix32->smem_start); 1168 1169 err |= put_user(fix->smem_len, &fix32->smem_len); 1170 err |= put_user(fix->type, &fix32->type); 1171 err |= put_user(fix->type_aux, &fix32->type_aux); 1172 err |= put_user(fix->visual, &fix32->visual); 1173 err |= put_user(fix->xpanstep, &fix32->xpanstep); 1174 err |= put_user(fix->ypanstep, &fix32->ypanstep); 1175 err |= put_user(fix->ywrapstep, &fix32->ywrapstep); 1176 err |= put_user(fix->line_length, &fix32->line_length); 1177 1178 data = (__u32) (unsigned long) fix->mmio_start; 1179 err |= put_user(data, &fix32->mmio_start); 1180 1181 err |= put_user(fix->mmio_len, &fix32->mmio_len); 1182 err |= put_user(fix->accel, &fix32->accel); 1183 err |= copy_to_user(fix32->reserved, fix->reserved, 1184 sizeof(fix->reserved)); 1185 1186 if (err) 1187 return -EFAULT; 1188 return 0; 1189 } 1190 1191 static int fb_get_fscreeninfo(struct fb_info *info, unsigned int cmd, 1192 unsigned long arg) 1193 { 1194 struct fb_fix_screeninfo fix; 1195 1196 lock_fb_info(info); 1197 fix = info->fix; 1198 if (info->flags & FBINFO_HIDE_SMEM_START) 1199 fix.smem_start = 0; 1200 unlock_fb_info(info); 1201 return do_fscreeninfo_to_user(&fix, compat_ptr(arg)); 1202 } 1203 1204 static long fb_compat_ioctl(struct file *file, unsigned int cmd, 1205 unsigned long arg) 1206 { 1207 struct fb_info *info = file_fb_info(file); 1208 const struct fb_ops *fb; 1209 long ret = -ENOIOCTLCMD; 1210 1211 if (!info) 1212 return -ENODEV; 1213 fb = info->fbops; 1214 switch(cmd) { 1215 case FBIOGET_VSCREENINFO: 1216 case FBIOPUT_VSCREENINFO: 1217 case FBIOPAN_DISPLAY: 1218 case FBIOGET_CON2FBMAP: 1219 case FBIOPUT_CON2FBMAP: 1220 arg = (unsigned long) compat_ptr(arg); 1221 fallthrough; 1222 case FBIOBLANK: 1223 ret = do_fb_ioctl(info, cmd, arg); 1224 break; 1225 1226 case FBIOGET_FSCREENINFO: 1227 ret = fb_get_fscreeninfo(info, cmd, arg); 1228 break; 1229 1230 case FBIOGETCMAP: 1231 case FBIOPUTCMAP: 1232 ret = fb_getput_cmap(info, cmd, arg); 1233 break; 1234 1235 default: 1236 if (fb->fb_compat_ioctl) 1237 ret = fb->fb_compat_ioctl(info, cmd, arg); 1238 break; 1239 } 1240 return ret; 1241 } 1242 #endif 1243 1244 static int 1245 fb_mmap(struct file *file, struct vm_area_struct * vma) 1246 { 1247 struct fb_info *info = file_fb_info(file); 1248 unsigned long mmio_pgoff; 1249 unsigned long start; 1250 u32 len; 1251 1252 if (!info) 1253 return -ENODEV; 1254 mutex_lock(&info->mm_lock); 1255 1256 if (info->fbops->fb_mmap) { 1257 int res; 1258 1259 /* 1260 * The framebuffer needs to be accessed decrypted, be sure 1261 * SME protection is removed ahead of the call 1262 */ 1263 vma->vm_page_prot = pgprot_decrypted(vma->vm_page_prot); 1264 res = info->fbops->fb_mmap(info, vma); 1265 mutex_unlock(&info->mm_lock); 1266 return res; 1267 #if IS_ENABLED(CONFIG_FB_DEFERRED_IO) 1268 } else if (info->fbdefio) { 1269 /* 1270 * FB deferred I/O wants you to handle mmap in your drivers. At a 1271 * minimum, point struct fb_ops.fb_mmap to fb_deferred_io_mmap(). 1272 */ 1273 dev_warn_once(info->dev, "fbdev mmap not set up for deferred I/O.\n"); 1274 mutex_unlock(&info->mm_lock); 1275 return -ENODEV; 1276 #endif 1277 } 1278 1279 /* 1280 * Ugh. This can be either the frame buffer mapping, or 1281 * if pgoff points past it, the mmio mapping. 1282 */ 1283 start = info->fix.smem_start; 1284 len = info->fix.smem_len; 1285 mmio_pgoff = PAGE_ALIGN((start & ~PAGE_MASK) + len) >> PAGE_SHIFT; 1286 if (vma->vm_pgoff >= mmio_pgoff) { 1287 if (info->var.accel_flags) { 1288 mutex_unlock(&info->mm_lock); 1289 return -EINVAL; 1290 } 1291 1292 vma->vm_pgoff -= mmio_pgoff; 1293 start = info->fix.mmio_start; 1294 len = info->fix.mmio_len; 1295 } 1296 mutex_unlock(&info->mm_lock); 1297 1298 vma->vm_page_prot = vm_get_page_prot(vma->vm_flags); 1299 fb_pgprotect(file, vma, start); 1300 1301 return vm_iomap_memory(vma, start, len); 1302 } 1303 1304 static int 1305 fb_open(struct inode *inode, struct file *file) 1306 __acquires(&info->lock) 1307 __releases(&info->lock) 1308 { 1309 int fbidx = iminor(inode); 1310 struct fb_info *info; 1311 int res = 0; 1312 1313 info = get_fb_info(fbidx); 1314 if (!info) { 1315 request_module("fb%d", fbidx); 1316 info = get_fb_info(fbidx); 1317 if (!info) 1318 return -ENODEV; 1319 } 1320 if (IS_ERR(info)) 1321 return PTR_ERR(info); 1322 1323 lock_fb_info(info); 1324 if (!try_module_get(info->fbops->owner)) { 1325 res = -ENODEV; 1326 goto out; 1327 } 1328 file->private_data = info; 1329 if (info->fbops->fb_open) { 1330 res = info->fbops->fb_open(info,1); 1331 if (res) 1332 module_put(info->fbops->owner); 1333 } 1334 #ifdef CONFIG_FB_DEFERRED_IO 1335 if (info->fbdefio) 1336 fb_deferred_io_open(info, inode, file); 1337 #endif 1338 out: 1339 unlock_fb_info(info); 1340 if (res) 1341 put_fb_info(info); 1342 return res; 1343 } 1344 1345 static int 1346 fb_release(struct inode *inode, struct file *file) 1347 __acquires(&info->lock) 1348 __releases(&info->lock) 1349 { 1350 struct fb_info * const info = file->private_data; 1351 1352 lock_fb_info(info); 1353 #if IS_ENABLED(CONFIG_FB_DEFERRED_IO) 1354 if (info->fbdefio) 1355 fb_deferred_io_release(info); 1356 #endif 1357 if (info->fbops->fb_release) 1358 info->fbops->fb_release(info,1); 1359 module_put(info->fbops->owner); 1360 unlock_fb_info(info); 1361 put_fb_info(info); 1362 return 0; 1363 } 1364 1365 #if defined(CONFIG_FB_PROVIDE_GET_FB_UNMAPPED_AREA) && !defined(CONFIG_MMU) 1366 static unsigned long get_fb_unmapped_area(struct file *filp, 1367 unsigned long addr, unsigned long len, 1368 unsigned long pgoff, unsigned long flags) 1369 { 1370 struct fb_info * const info = filp->private_data; 1371 unsigned long fb_size = PAGE_ALIGN(info->fix.smem_len); 1372 1373 if (pgoff > fb_size || len > fb_size - pgoff) 1374 return -EINVAL; 1375 1376 return (unsigned long)info->screen_base + pgoff; 1377 } 1378 #endif 1379 1380 static const struct file_operations fb_fops = { 1381 .owner = THIS_MODULE, 1382 .read = fb_read, 1383 .write = fb_write, 1384 .unlocked_ioctl = fb_ioctl, 1385 #ifdef CONFIG_COMPAT 1386 .compat_ioctl = fb_compat_ioctl, 1387 #endif 1388 .mmap = fb_mmap, 1389 .open = fb_open, 1390 .release = fb_release, 1391 #if defined(HAVE_ARCH_FB_UNMAPPED_AREA) || \ 1392 (defined(CONFIG_FB_PROVIDE_GET_FB_UNMAPPED_AREA) && \ 1393 !defined(CONFIG_MMU)) 1394 .get_unmapped_area = get_fb_unmapped_area, 1395 #endif 1396 #ifdef CONFIG_FB_DEFERRED_IO 1397 .fsync = fb_deferred_io_fsync, 1398 #endif 1399 .llseek = default_llseek, 1400 }; 1401 1402 struct class *fb_class; 1403 EXPORT_SYMBOL(fb_class); 1404 1405 static int fb_check_foreignness(struct fb_info *fi) 1406 { 1407 const bool foreign_endian = fi->flags & FBINFO_FOREIGN_ENDIAN; 1408 1409 fi->flags &= ~FBINFO_FOREIGN_ENDIAN; 1410 1411 #ifdef __BIG_ENDIAN 1412 fi->flags |= foreign_endian ? 0 : FBINFO_BE_MATH; 1413 #else 1414 fi->flags |= foreign_endian ? FBINFO_BE_MATH : 0; 1415 #endif /* __BIG_ENDIAN */ 1416 1417 if (fi->flags & FBINFO_BE_MATH && !fb_be_math(fi)) { 1418 pr_err("%s: enable CONFIG_FB_BIG_ENDIAN to " 1419 "support this framebuffer\n", fi->fix.id); 1420 return -ENOSYS; 1421 } else if (!(fi->flags & FBINFO_BE_MATH) && fb_be_math(fi)) { 1422 pr_err("%s: enable CONFIG_FB_LITTLE_ENDIAN to " 1423 "support this framebuffer\n", fi->fix.id); 1424 return -ENOSYS; 1425 } 1426 1427 return 0; 1428 } 1429 1430 static int do_register_framebuffer(struct fb_info *fb_info) 1431 { 1432 int i; 1433 struct fb_videomode mode; 1434 1435 if (fb_check_foreignness(fb_info)) 1436 return -ENOSYS; 1437 1438 if (num_registered_fb == FB_MAX) 1439 return -ENXIO; 1440 1441 num_registered_fb++; 1442 for (i = 0 ; i < FB_MAX; i++) 1443 if (!registered_fb[i]) 1444 break; 1445 fb_info->node = i; 1446 refcount_set(&fb_info->count, 1); 1447 mutex_init(&fb_info->lock); 1448 mutex_init(&fb_info->mm_lock); 1449 1450 fb_info->dev = device_create(fb_class, fb_info->device, 1451 MKDEV(FB_MAJOR, i), NULL, "fb%d", i); 1452 if (IS_ERR(fb_info->dev)) { 1453 /* Not fatal */ 1454 printk(KERN_WARNING "Unable to create device for framebuffer %d; errno = %ld\n", i, PTR_ERR(fb_info->dev)); 1455 fb_info->dev = NULL; 1456 } else 1457 fb_init_device(fb_info); 1458 1459 if (fb_info->pixmap.addr == NULL) { 1460 fb_info->pixmap.addr = kmalloc(FBPIXMAPSIZE, GFP_KERNEL); 1461 if (fb_info->pixmap.addr) { 1462 fb_info->pixmap.size = FBPIXMAPSIZE; 1463 fb_info->pixmap.buf_align = 1; 1464 fb_info->pixmap.scan_align = 1; 1465 fb_info->pixmap.access_align = 32; 1466 fb_info->pixmap.flags = FB_PIXMAP_DEFAULT; 1467 } 1468 } 1469 fb_info->pixmap.offset = 0; 1470 1471 if (!fb_info->pixmap.blit_x) 1472 fb_info->pixmap.blit_x = ~(u32)0; 1473 1474 if (!fb_info->pixmap.blit_y) 1475 fb_info->pixmap.blit_y = ~(u32)0; 1476 1477 if (!fb_info->modelist.prev || !fb_info->modelist.next) 1478 INIT_LIST_HEAD(&fb_info->modelist); 1479 1480 if (fb_info->skip_vt_switch) 1481 pm_vt_switch_required(fb_info->dev, false); 1482 else 1483 pm_vt_switch_required(fb_info->dev, true); 1484 1485 fb_var_to_videomode(&mode, &fb_info->var); 1486 fb_add_videomode(&mode, &fb_info->modelist); 1487 registered_fb[i] = fb_info; 1488 1489 #ifdef CONFIG_GUMSTIX_AM200EPD 1490 { 1491 struct fb_event event; 1492 event.info = fb_info; 1493 fb_notifier_call_chain(FB_EVENT_FB_REGISTERED, &event); 1494 } 1495 #endif 1496 1497 return fbcon_fb_registered(fb_info); 1498 } 1499 1500 static void unbind_console(struct fb_info *fb_info) 1501 { 1502 int i = fb_info->node; 1503 1504 if (WARN_ON(i < 0 || i >= FB_MAX || registered_fb[i] != fb_info)) 1505 return; 1506 1507 fbcon_fb_unbind(fb_info); 1508 } 1509 1510 static void unlink_framebuffer(struct fb_info *fb_info) 1511 { 1512 int i; 1513 1514 i = fb_info->node; 1515 if (WARN_ON(i < 0 || i >= FB_MAX || registered_fb[i] != fb_info)) 1516 return; 1517 1518 if (!fb_info->dev) 1519 return; 1520 1521 device_destroy(fb_class, MKDEV(FB_MAJOR, i)); 1522 1523 pm_vt_switch_unregister(fb_info->dev); 1524 1525 unbind_console(fb_info); 1526 1527 fb_info->dev = NULL; 1528 } 1529 1530 static void do_unregister_framebuffer(struct fb_info *fb_info) 1531 { 1532 unlink_framebuffer(fb_info); 1533 if (fb_info->pixmap.addr && 1534 (fb_info->pixmap.flags & FB_PIXMAP_DEFAULT)) { 1535 kfree(fb_info->pixmap.addr); 1536 fb_info->pixmap.addr = NULL; 1537 } 1538 1539 fb_destroy_modelist(&fb_info->modelist); 1540 registered_fb[fb_info->node] = NULL; 1541 num_registered_fb--; 1542 fb_cleanup_device(fb_info); 1543 #ifdef CONFIG_GUMSTIX_AM200EPD 1544 { 1545 struct fb_event event; 1546 event.info = fb_info; 1547 fb_notifier_call_chain(FB_EVENT_FB_UNREGISTERED, &event); 1548 } 1549 #endif 1550 fbcon_fb_unregistered(fb_info); 1551 1552 /* this may free fb info */ 1553 put_fb_info(fb_info); 1554 } 1555 1556 /** 1557 * register_framebuffer - registers a frame buffer device 1558 * @fb_info: frame buffer info structure 1559 * 1560 * Registers a frame buffer device @fb_info. 1561 * 1562 * Returns negative errno on error, or zero for success. 1563 * 1564 */ 1565 int 1566 register_framebuffer(struct fb_info *fb_info) 1567 { 1568 int ret; 1569 1570 mutex_lock(®istration_lock); 1571 ret = do_register_framebuffer(fb_info); 1572 mutex_unlock(®istration_lock); 1573 1574 return ret; 1575 } 1576 EXPORT_SYMBOL(register_framebuffer); 1577 1578 /** 1579 * unregister_framebuffer - releases a frame buffer device 1580 * @fb_info: frame buffer info structure 1581 * 1582 * Unregisters a frame buffer device @fb_info. 1583 * 1584 * Returns negative errno on error, or zero for success. 1585 * 1586 * This function will also notify the framebuffer console 1587 * to release the driver. 1588 * 1589 * This is meant to be called within a driver's module_exit() 1590 * function. If this is called outside module_exit(), ensure 1591 * that the driver implements fb_open() and fb_release() to 1592 * check that no processes are using the device. 1593 */ 1594 void 1595 unregister_framebuffer(struct fb_info *fb_info) 1596 { 1597 mutex_lock(®istration_lock); 1598 do_unregister_framebuffer(fb_info); 1599 mutex_unlock(®istration_lock); 1600 } 1601 EXPORT_SYMBOL(unregister_framebuffer); 1602 1603 /** 1604 * fb_set_suspend - low level driver signals suspend 1605 * @info: framebuffer affected 1606 * @state: 0 = resuming, !=0 = suspending 1607 * 1608 * This is meant to be used by low level drivers to 1609 * signal suspend/resume to the core & clients. 1610 * It must be called with the console semaphore held 1611 */ 1612 void fb_set_suspend(struct fb_info *info, int state) 1613 { 1614 WARN_CONSOLE_UNLOCKED(); 1615 1616 if (state) { 1617 fbcon_suspended(info); 1618 info->state = FBINFO_STATE_SUSPENDED; 1619 } else { 1620 info->state = FBINFO_STATE_RUNNING; 1621 fbcon_resumed(info); 1622 } 1623 } 1624 EXPORT_SYMBOL(fb_set_suspend); 1625 1626 /** 1627 * fbmem_init - init frame buffer subsystem 1628 * 1629 * Initialize the frame buffer subsystem. 1630 * 1631 * NOTE: This function is _only_ to be called by drivers/char/mem.c. 1632 * 1633 */ 1634 1635 static int __init 1636 fbmem_init(void) 1637 { 1638 int ret; 1639 1640 if (!proc_create_seq("fb", 0, NULL, &proc_fb_seq_ops)) 1641 return -ENOMEM; 1642 1643 ret = register_chrdev(FB_MAJOR, "fb", &fb_fops); 1644 if (ret) { 1645 printk("unable to get major %d for fb devs\n", FB_MAJOR); 1646 goto err_chrdev; 1647 } 1648 1649 fb_class = class_create("graphics"); 1650 if (IS_ERR(fb_class)) { 1651 ret = PTR_ERR(fb_class); 1652 pr_warn("Unable to create fb class; errno = %d\n", ret); 1653 fb_class = NULL; 1654 goto err_class; 1655 } 1656 1657 fb_console_init(); 1658 1659 return 0; 1660 1661 err_class: 1662 unregister_chrdev(FB_MAJOR, "fb"); 1663 err_chrdev: 1664 remove_proc_entry("fb", NULL); 1665 return ret; 1666 } 1667 1668 #ifdef MODULE 1669 module_init(fbmem_init); 1670 static void __exit 1671 fbmem_exit(void) 1672 { 1673 fb_console_exit(); 1674 1675 remove_proc_entry("fb", NULL); 1676 class_destroy(fb_class); 1677 unregister_chrdev(FB_MAJOR, "fb"); 1678 } 1679 1680 module_exit(fbmem_exit); 1681 MODULE_LICENSE("GPL"); 1682 MODULE_DESCRIPTION("Framebuffer base"); 1683 #else 1684 subsys_initcall(fbmem_init); 1685 #endif 1686 1687 int fb_new_modelist(struct fb_info *info) 1688 { 1689 struct fb_var_screeninfo var = info->var; 1690 struct list_head *pos, *n; 1691 struct fb_modelist *modelist; 1692 struct fb_videomode *m, mode; 1693 int err; 1694 1695 list_for_each_safe(pos, n, &info->modelist) { 1696 modelist = list_entry(pos, struct fb_modelist, list); 1697 m = &modelist->mode; 1698 fb_videomode_to_var(&var, m); 1699 var.activate = FB_ACTIVATE_TEST; 1700 err = fb_set_var(info, &var); 1701 fb_var_to_videomode(&mode, &var); 1702 if (err || !fb_mode_is_equal(m, &mode)) { 1703 list_del(pos); 1704 kfree(pos); 1705 } 1706 } 1707 1708 if (list_empty(&info->modelist)) 1709 return 1; 1710 1711 fbcon_new_modelist(info); 1712 1713 return 0; 1714 } 1715 1716 #if defined(CONFIG_VIDEO_NOMODESET) 1717 bool fb_modesetting_disabled(const char *drvname) 1718 { 1719 bool fwonly = video_firmware_drivers_only(); 1720 1721 if (fwonly) 1722 pr_warn("Driver %s not loading because of nomodeset parameter\n", 1723 drvname); 1724 1725 return fwonly; 1726 } 1727 EXPORT_SYMBOL(fb_modesetting_disabled); 1728 #endif 1729 1730 MODULE_LICENSE("GPL"); 1731