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 <asm/fb.h> 41 42 #include <video/nomodeset.h> 43 #include <video/vga.h> 44 45 /* 46 * Frame buffer device initialization and setup routines 47 */ 48 49 #define FBPIXMAPSIZE (1024 * 8) 50 51 static DEFINE_MUTEX(registration_lock); 52 53 struct fb_info *registered_fb[FB_MAX] __read_mostly; 54 int num_registered_fb __read_mostly; 55 #define for_each_registered_fb(i) \ 56 for (i = 0; i < FB_MAX; i++) \ 57 if (!registered_fb[i]) {} else 58 59 bool fb_center_logo __read_mostly; 60 61 int fb_logo_count __read_mostly = -1; 62 63 static struct fb_info *get_fb_info(unsigned int idx) 64 { 65 struct fb_info *fb_info; 66 67 if (idx >= FB_MAX) 68 return ERR_PTR(-ENODEV); 69 70 mutex_lock(®istration_lock); 71 fb_info = registered_fb[idx]; 72 if (fb_info) 73 refcount_inc(&fb_info->count); 74 mutex_unlock(®istration_lock); 75 76 return fb_info; 77 } 78 79 static void put_fb_info(struct fb_info *fb_info) 80 { 81 if (!refcount_dec_and_test(&fb_info->count)) 82 return; 83 if (fb_info->fbops->fb_destroy) 84 fb_info->fbops->fb_destroy(fb_info); 85 } 86 87 /* 88 * Helpers 89 */ 90 91 int fb_get_color_depth(struct fb_var_screeninfo *var, 92 struct fb_fix_screeninfo *fix) 93 { 94 int depth = 0; 95 96 if (fix->visual == FB_VISUAL_MONO01 || 97 fix->visual == FB_VISUAL_MONO10) 98 depth = 1; 99 else { 100 if (var->green.length == var->blue.length && 101 var->green.length == var->red.length && 102 var->green.offset == var->blue.offset && 103 var->green.offset == var->red.offset) 104 depth = var->green.length; 105 else 106 depth = var->green.length + var->red.length + 107 var->blue.length; 108 } 109 110 return depth; 111 } 112 EXPORT_SYMBOL(fb_get_color_depth); 113 114 /* 115 * Data padding functions. 116 */ 117 void fb_pad_aligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 s_pitch, u32 height) 118 { 119 __fb_pad_aligned_buffer(dst, d_pitch, src, s_pitch, height); 120 } 121 EXPORT_SYMBOL(fb_pad_aligned_buffer); 122 123 void fb_pad_unaligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 idx, u32 height, 124 u32 shift_high, u32 shift_low, u32 mod) 125 { 126 u8 mask = (u8) (0xfff << shift_high), tmp; 127 int i, j; 128 129 for (i = height; i--; ) { 130 for (j = 0; j < idx; j++) { 131 tmp = dst[j]; 132 tmp &= mask; 133 tmp |= *src >> shift_low; 134 dst[j] = tmp; 135 tmp = *src << shift_high; 136 dst[j+1] = tmp; 137 src++; 138 } 139 tmp = dst[idx]; 140 tmp &= mask; 141 tmp |= *src >> shift_low; 142 dst[idx] = tmp; 143 if (shift_high < mod) { 144 tmp = *src << shift_high; 145 dst[idx+1] = tmp; 146 } 147 src++; 148 dst += d_pitch; 149 } 150 } 151 EXPORT_SYMBOL(fb_pad_unaligned_buffer); 152 153 /* 154 * we need to lock this section since fb_cursor 155 * may use fb_imageblit() 156 */ 157 char* fb_get_buffer_offset(struct fb_info *info, struct fb_pixmap *buf, u32 size) 158 { 159 u32 align = buf->buf_align - 1, offset; 160 char *addr = buf->addr; 161 162 /* If IO mapped, we need to sync before access, no sharing of 163 * the pixmap is done 164 */ 165 if (buf->flags & FB_PIXMAP_IO) { 166 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC)) 167 info->fbops->fb_sync(info); 168 return addr; 169 } 170 171 /* See if we fit in the remaining pixmap space */ 172 offset = buf->offset + align; 173 offset &= ~align; 174 if (offset + size > buf->size) { 175 /* We do not fit. In order to be able to re-use the buffer, 176 * we must ensure no asynchronous DMA'ing or whatever operation 177 * is in progress, we sync for that. 178 */ 179 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC)) 180 info->fbops->fb_sync(info); 181 offset = 0; 182 } 183 buf->offset = offset + size; 184 addr += offset; 185 186 return addr; 187 } 188 EXPORT_SYMBOL(fb_get_buffer_offset); 189 190 #ifdef CONFIG_LOGO 191 192 static inline unsigned safe_shift(unsigned d, int n) 193 { 194 return n < 0 ? d >> -n : d << n; 195 } 196 197 static void fb_set_logocmap(struct fb_info *info, 198 const struct linux_logo *logo) 199 { 200 struct fb_cmap palette_cmap; 201 u16 palette_green[16]; 202 u16 palette_blue[16]; 203 u16 palette_red[16]; 204 int i, j, n; 205 const unsigned char *clut = logo->clut; 206 207 palette_cmap.start = 0; 208 palette_cmap.len = 16; 209 palette_cmap.red = palette_red; 210 palette_cmap.green = palette_green; 211 palette_cmap.blue = palette_blue; 212 palette_cmap.transp = NULL; 213 214 for (i = 0; i < logo->clutsize; i += n) { 215 n = logo->clutsize - i; 216 /* palette_cmap provides space for only 16 colors at once */ 217 if (n > 16) 218 n = 16; 219 palette_cmap.start = 32 + i; 220 palette_cmap.len = n; 221 for (j = 0; j < n; ++j) { 222 palette_cmap.red[j] = clut[0] << 8 | clut[0]; 223 palette_cmap.green[j] = clut[1] << 8 | clut[1]; 224 palette_cmap.blue[j] = clut[2] << 8 | clut[2]; 225 clut += 3; 226 } 227 fb_set_cmap(&palette_cmap, info); 228 } 229 } 230 231 static void fb_set_logo_truepalette(struct fb_info *info, 232 const struct linux_logo *logo, 233 u32 *palette) 234 { 235 static const unsigned char mask[] = { 0,0x80,0xc0,0xe0,0xf0,0xf8,0xfc,0xfe,0xff }; 236 unsigned char redmask, greenmask, bluemask; 237 int redshift, greenshift, blueshift; 238 int i; 239 const unsigned char *clut = logo->clut; 240 241 /* 242 * We have to create a temporary palette since console palette is only 243 * 16 colors long. 244 */ 245 /* Bug: Doesn't obey msb_right ... (who needs that?) */ 246 redmask = mask[info->var.red.length < 8 ? info->var.red.length : 8]; 247 greenmask = mask[info->var.green.length < 8 ? info->var.green.length : 8]; 248 bluemask = mask[info->var.blue.length < 8 ? info->var.blue.length : 8]; 249 redshift = info->var.red.offset - (8 - info->var.red.length); 250 greenshift = info->var.green.offset - (8 - info->var.green.length); 251 blueshift = info->var.blue.offset - (8 - info->var.blue.length); 252 253 for ( i = 0; i < logo->clutsize; i++) { 254 palette[i+32] = (safe_shift((clut[0] & redmask), redshift) | 255 safe_shift((clut[1] & greenmask), greenshift) | 256 safe_shift((clut[2] & bluemask), blueshift)); 257 clut += 3; 258 } 259 } 260 261 static void fb_set_logo_directpalette(struct fb_info *info, 262 const struct linux_logo *logo, 263 u32 *palette) 264 { 265 int redshift, greenshift, blueshift; 266 int i; 267 268 redshift = info->var.red.offset; 269 greenshift = info->var.green.offset; 270 blueshift = info->var.blue.offset; 271 272 for (i = 32; i < 32 + logo->clutsize; i++) 273 palette[i] = i << redshift | i << greenshift | i << blueshift; 274 } 275 276 static void fb_set_logo(struct fb_info *info, 277 const struct linux_logo *logo, u8 *dst, 278 int depth) 279 { 280 int i, j, k; 281 const u8 *src = logo->data; 282 u8 xor = (info->fix.visual == FB_VISUAL_MONO01) ? 0xff : 0; 283 u8 fg = 1, d; 284 285 switch (fb_get_color_depth(&info->var, &info->fix)) { 286 case 1: 287 fg = 1; 288 break; 289 case 2: 290 fg = 3; 291 break; 292 default: 293 fg = 7; 294 break; 295 } 296 297 if (info->fix.visual == FB_VISUAL_MONO01 || 298 info->fix.visual == FB_VISUAL_MONO10) 299 fg = ~((u8) (0xfff << info->var.green.length)); 300 301 switch (depth) { 302 case 4: 303 for (i = 0; i < logo->height; i++) 304 for (j = 0; j < logo->width; src++) { 305 *dst++ = *src >> 4; 306 j++; 307 if (j < logo->width) { 308 *dst++ = *src & 0x0f; 309 j++; 310 } 311 } 312 break; 313 case 1: 314 for (i = 0; i < logo->height; i++) { 315 for (j = 0; j < logo->width; src++) { 316 d = *src ^ xor; 317 for (k = 7; k >= 0 && j < logo->width; k--) { 318 *dst++ = ((d >> k) & 1) ? fg : 0; 319 j++; 320 } 321 } 322 } 323 break; 324 } 325 } 326 327 /* 328 * Three (3) kinds of logo maps exist. linux_logo_clut224 (>16 colors), 329 * linux_logo_vga16 (16 colors) and linux_logo_mono (2 colors). Depending on 330 * the visual format and color depth of the framebuffer, the DAC, the 331 * pseudo_palette, and the logo data will be adjusted accordingly. 332 * 333 * Case 1 - linux_logo_clut224: 334 * Color exceeds the number of console colors (16), thus we set the hardware DAC 335 * using fb_set_cmap() appropriately. The "needs_cmapreset" flag will be set. 336 * 337 * For visuals that require color info from the pseudo_palette, we also construct 338 * one for temporary use. The "needs_directpalette" or "needs_truepalette" flags 339 * will be set. 340 * 341 * Case 2 - linux_logo_vga16: 342 * The number of colors just matches the console colors, thus there is no need 343 * to set the DAC or the pseudo_palette. However, the bitmap is packed, ie, 344 * each byte contains color information for two pixels (upper and lower nibble). 345 * To be consistent with fb_imageblit() usage, we therefore separate the two 346 * nibbles into separate bytes. The "depth" flag will be set to 4. 347 * 348 * Case 3 - linux_logo_mono: 349 * This is similar with Case 2. Each byte contains information for 8 pixels. 350 * We isolate each bit and expand each into a byte. The "depth" flag will 351 * be set to 1. 352 */ 353 static struct logo_data { 354 int depth; 355 int needs_directpalette; 356 int needs_truepalette; 357 int needs_cmapreset; 358 const struct linux_logo *logo; 359 } fb_logo __read_mostly; 360 361 static void fb_rotate_logo_ud(const u8 *in, u8 *out, u32 width, u32 height) 362 { 363 u32 size = width * height, i; 364 365 out += size - 1; 366 367 for (i = size; i--; ) 368 *out-- = *in++; 369 } 370 371 static void fb_rotate_logo_cw(const u8 *in, u8 *out, u32 width, u32 height) 372 { 373 int i, j, h = height - 1; 374 375 for (i = 0; i < height; i++) 376 for (j = 0; j < width; j++) 377 out[height * j + h - i] = *in++; 378 } 379 380 static void fb_rotate_logo_ccw(const u8 *in, u8 *out, u32 width, u32 height) 381 { 382 int i, j, w = width - 1; 383 384 for (i = 0; i < height; i++) 385 for (j = 0; j < width; j++) 386 out[height * (w - j) + i] = *in++; 387 } 388 389 static void fb_rotate_logo(struct fb_info *info, u8 *dst, 390 struct fb_image *image, int rotate) 391 { 392 u32 tmp; 393 394 if (rotate == FB_ROTATE_UD) { 395 fb_rotate_logo_ud(image->data, dst, image->width, 396 image->height); 397 image->dx = info->var.xres - image->width - image->dx; 398 image->dy = info->var.yres - image->height - image->dy; 399 } else if (rotate == FB_ROTATE_CW) { 400 fb_rotate_logo_cw(image->data, dst, image->width, 401 image->height); 402 swap(image->width, image->height); 403 tmp = image->dy; 404 image->dy = image->dx; 405 image->dx = info->var.xres - image->width - tmp; 406 } else if (rotate == FB_ROTATE_CCW) { 407 fb_rotate_logo_ccw(image->data, dst, image->width, 408 image->height); 409 swap(image->width, image->height); 410 tmp = image->dx; 411 image->dx = image->dy; 412 image->dy = info->var.yres - image->height - tmp; 413 } 414 415 image->data = dst; 416 } 417 418 static void fb_do_show_logo(struct fb_info *info, struct fb_image *image, 419 int rotate, unsigned int num) 420 { 421 unsigned int x; 422 423 if (image->width > info->var.xres || image->height > info->var.yres) 424 return; 425 426 if (rotate == FB_ROTATE_UR) { 427 for (x = 0; 428 x < num && image->dx + image->width <= info->var.xres; 429 x++) { 430 info->fbops->fb_imageblit(info, image); 431 image->dx += image->width + 8; 432 } 433 } else if (rotate == FB_ROTATE_UD) { 434 u32 dx = image->dx; 435 436 for (x = 0; x < num && image->dx <= dx; x++) { 437 info->fbops->fb_imageblit(info, image); 438 image->dx -= image->width + 8; 439 } 440 } else if (rotate == FB_ROTATE_CW) { 441 for (x = 0; 442 x < num && image->dy + image->height <= info->var.yres; 443 x++) { 444 info->fbops->fb_imageblit(info, image); 445 image->dy += image->height + 8; 446 } 447 } else if (rotate == FB_ROTATE_CCW) { 448 u32 dy = image->dy; 449 450 for (x = 0; x < num && image->dy <= dy; x++) { 451 info->fbops->fb_imageblit(info, image); 452 image->dy -= image->height + 8; 453 } 454 } 455 } 456 457 static int fb_show_logo_line(struct fb_info *info, int rotate, 458 const struct linux_logo *logo, int y, 459 unsigned int n) 460 { 461 u32 *palette = NULL, *saved_pseudo_palette = NULL; 462 unsigned char *logo_new = NULL, *logo_rotate = NULL; 463 struct fb_image image; 464 465 /* Return if the frame buffer is not mapped or suspended */ 466 if (logo == NULL || info->state != FBINFO_STATE_RUNNING || 467 info->fbops->owner) 468 return 0; 469 470 image.depth = 8; 471 image.data = logo->data; 472 473 if (fb_logo.needs_cmapreset) 474 fb_set_logocmap(info, logo); 475 476 if (fb_logo.needs_truepalette || 477 fb_logo.needs_directpalette) { 478 palette = kmalloc(256 * 4, GFP_KERNEL); 479 if (palette == NULL) 480 return 0; 481 482 if (fb_logo.needs_truepalette) 483 fb_set_logo_truepalette(info, logo, palette); 484 else 485 fb_set_logo_directpalette(info, logo, palette); 486 487 saved_pseudo_palette = info->pseudo_palette; 488 info->pseudo_palette = palette; 489 } 490 491 if (fb_logo.depth <= 4) { 492 logo_new = kmalloc_array(logo->width, logo->height, 493 GFP_KERNEL); 494 if (logo_new == NULL) { 495 kfree(palette); 496 if (saved_pseudo_palette) 497 info->pseudo_palette = saved_pseudo_palette; 498 return 0; 499 } 500 image.data = logo_new; 501 fb_set_logo(info, logo, logo_new, fb_logo.depth); 502 } 503 504 if (fb_center_logo) { 505 int xres = info->var.xres; 506 int yres = info->var.yres; 507 508 if (rotate == FB_ROTATE_CW || rotate == FB_ROTATE_CCW) { 509 xres = info->var.yres; 510 yres = info->var.xres; 511 } 512 513 while (n && (n * (logo->width + 8) - 8 > xres)) 514 --n; 515 image.dx = (xres - (n * (logo->width + 8) - 8)) / 2; 516 image.dy = y ?: (yres - logo->height) / 2; 517 } else { 518 image.dx = 0; 519 image.dy = y; 520 } 521 522 image.width = logo->width; 523 image.height = logo->height; 524 525 if (rotate) { 526 logo_rotate = kmalloc_array(logo->width, logo->height, 527 GFP_KERNEL); 528 if (logo_rotate) 529 fb_rotate_logo(info, logo_rotate, &image, rotate); 530 } 531 532 fb_do_show_logo(info, &image, rotate, n); 533 534 kfree(palette); 535 if (saved_pseudo_palette != NULL) 536 info->pseudo_palette = saved_pseudo_palette; 537 kfree(logo_new); 538 kfree(logo_rotate); 539 return image.dy + logo->height; 540 } 541 542 543 #ifdef CONFIG_FB_LOGO_EXTRA 544 545 #define FB_LOGO_EX_NUM_MAX 10 546 static struct logo_data_extra { 547 const struct linux_logo *logo; 548 unsigned int n; 549 } fb_logo_ex[FB_LOGO_EX_NUM_MAX]; 550 static unsigned int fb_logo_ex_num; 551 552 void fb_append_extra_logo(const struct linux_logo *logo, unsigned int n) 553 { 554 if (!n || fb_logo_ex_num == FB_LOGO_EX_NUM_MAX) 555 return; 556 557 fb_logo_ex[fb_logo_ex_num].logo = logo; 558 fb_logo_ex[fb_logo_ex_num].n = n; 559 fb_logo_ex_num++; 560 } 561 562 static int fb_prepare_extra_logos(struct fb_info *info, unsigned int height, 563 unsigned int yres) 564 { 565 unsigned int i; 566 567 /* FIXME: logo_ex supports only truecolor fb. */ 568 if (info->fix.visual != FB_VISUAL_TRUECOLOR) 569 fb_logo_ex_num = 0; 570 571 for (i = 0; i < fb_logo_ex_num; i++) { 572 if (fb_logo_ex[i].logo->type != fb_logo.logo->type) { 573 fb_logo_ex[i].logo = NULL; 574 continue; 575 } 576 height += fb_logo_ex[i].logo->height; 577 if (height > yres) { 578 height -= fb_logo_ex[i].logo->height; 579 fb_logo_ex_num = i; 580 break; 581 } 582 } 583 return height; 584 } 585 586 static int fb_show_extra_logos(struct fb_info *info, int y, int rotate) 587 { 588 unsigned int i; 589 590 for (i = 0; i < fb_logo_ex_num; i++) 591 y = fb_show_logo_line(info, rotate, 592 fb_logo_ex[i].logo, y, fb_logo_ex[i].n); 593 594 return y; 595 } 596 597 #else /* !CONFIG_FB_LOGO_EXTRA */ 598 599 static inline int fb_prepare_extra_logos(struct fb_info *info, 600 unsigned int height, 601 unsigned int yres) 602 { 603 return height; 604 } 605 606 static inline int fb_show_extra_logos(struct fb_info *info, int y, int rotate) 607 { 608 return y; 609 } 610 611 #endif /* CONFIG_FB_LOGO_EXTRA */ 612 613 614 int fb_prepare_logo(struct fb_info *info, int rotate) 615 { 616 int depth = fb_get_color_depth(&info->var, &info->fix); 617 unsigned int yres; 618 int height; 619 620 memset(&fb_logo, 0, sizeof(struct logo_data)); 621 622 if (info->flags & FBINFO_MISC_TILEBLITTING || 623 info->fbops->owner || !fb_logo_count) 624 return 0; 625 626 if (info->fix.visual == FB_VISUAL_DIRECTCOLOR) { 627 depth = info->var.blue.length; 628 if (info->var.red.length < depth) 629 depth = info->var.red.length; 630 if (info->var.green.length < depth) 631 depth = info->var.green.length; 632 } 633 634 if (info->fix.visual == FB_VISUAL_STATIC_PSEUDOCOLOR && depth > 4) { 635 /* assume console colormap */ 636 depth = 4; 637 } 638 639 /* Return if no suitable logo was found */ 640 fb_logo.logo = fb_find_logo(depth); 641 642 if (!fb_logo.logo) { 643 return 0; 644 } 645 646 if (rotate == FB_ROTATE_UR || rotate == FB_ROTATE_UD) 647 yres = info->var.yres; 648 else 649 yres = info->var.xres; 650 651 if (fb_logo.logo->height > yres) { 652 fb_logo.logo = NULL; 653 return 0; 654 } 655 656 /* What depth we asked for might be different from what we get */ 657 if (fb_logo.logo->type == LINUX_LOGO_CLUT224) 658 fb_logo.depth = 8; 659 else if (fb_logo.logo->type == LINUX_LOGO_VGA16) 660 fb_logo.depth = 4; 661 else 662 fb_logo.depth = 1; 663 664 665 if (fb_logo.depth > 4 && depth > 4) { 666 switch (info->fix.visual) { 667 case FB_VISUAL_TRUECOLOR: 668 fb_logo.needs_truepalette = 1; 669 break; 670 case FB_VISUAL_DIRECTCOLOR: 671 fb_logo.needs_directpalette = 1; 672 fb_logo.needs_cmapreset = 1; 673 break; 674 case FB_VISUAL_PSEUDOCOLOR: 675 fb_logo.needs_cmapreset = 1; 676 break; 677 } 678 } 679 680 height = fb_logo.logo->height; 681 if (fb_center_logo) 682 height += (yres - fb_logo.logo->height) / 2; 683 684 return fb_prepare_extra_logos(info, height, yres); 685 } 686 687 int fb_show_logo(struct fb_info *info, int rotate) 688 { 689 unsigned int count; 690 int y; 691 692 if (!fb_logo_count) 693 return 0; 694 695 count = fb_logo_count < 0 ? num_online_cpus() : fb_logo_count; 696 y = fb_show_logo_line(info, rotate, fb_logo.logo, 0, count); 697 y = fb_show_extra_logos(info, y, rotate); 698 699 return y; 700 } 701 #else 702 int fb_prepare_logo(struct fb_info *info, int rotate) { return 0; } 703 int fb_show_logo(struct fb_info *info, int rotate) { return 0; } 704 #endif /* CONFIG_LOGO */ 705 EXPORT_SYMBOL(fb_prepare_logo); 706 EXPORT_SYMBOL(fb_show_logo); 707 708 static void *fb_seq_start(struct seq_file *m, loff_t *pos) 709 { 710 mutex_lock(®istration_lock); 711 return (*pos < FB_MAX) ? pos : NULL; 712 } 713 714 static void *fb_seq_next(struct seq_file *m, void *v, loff_t *pos) 715 { 716 (*pos)++; 717 return (*pos < FB_MAX) ? pos : NULL; 718 } 719 720 static void fb_seq_stop(struct seq_file *m, void *v) 721 { 722 mutex_unlock(®istration_lock); 723 } 724 725 static int fb_seq_show(struct seq_file *m, void *v) 726 { 727 int i = *(loff_t *)v; 728 struct fb_info *fi = registered_fb[i]; 729 730 if (fi) 731 seq_printf(m, "%d %s\n", fi->node, fi->fix.id); 732 return 0; 733 } 734 735 static const struct seq_operations __maybe_unused proc_fb_seq_ops = { 736 .start = fb_seq_start, 737 .next = fb_seq_next, 738 .stop = fb_seq_stop, 739 .show = fb_seq_show, 740 }; 741 742 /* 743 * We hold a reference to the fb_info in file->private_data, 744 * but if the current registered fb has changed, we don't 745 * actually want to use it. 746 * 747 * So look up the fb_info using the inode minor number, 748 * and just verify it against the reference we have. 749 */ 750 static struct fb_info *file_fb_info(struct file *file) 751 { 752 struct inode *inode = file_inode(file); 753 int fbidx = iminor(inode); 754 struct fb_info *info = registered_fb[fbidx]; 755 756 if (info != file->private_data) 757 info = NULL; 758 return info; 759 } 760 761 static ssize_t 762 fb_read(struct file *file, char __user *buf, size_t count, loff_t *ppos) 763 { 764 unsigned long p = *ppos; 765 struct fb_info *info = file_fb_info(file); 766 u8 *buffer, *dst; 767 u8 __iomem *src; 768 int c, cnt = 0, err = 0; 769 unsigned long total_size; 770 771 if (!info || ! info->screen_base) 772 return -ENODEV; 773 774 if (info->state != FBINFO_STATE_RUNNING) 775 return -EPERM; 776 777 if (info->fbops->fb_read) 778 return info->fbops->fb_read(info, buf, count, ppos); 779 780 total_size = info->screen_size; 781 782 if (total_size == 0) 783 total_size = info->fix.smem_len; 784 785 if (p >= total_size) 786 return 0; 787 788 if (count >= total_size) 789 count = total_size; 790 791 if (count + p > total_size) 792 count = total_size - p; 793 794 buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count, 795 GFP_KERNEL); 796 if (!buffer) 797 return -ENOMEM; 798 799 src = (u8 __iomem *) (info->screen_base + p); 800 801 if (info->fbops->fb_sync) 802 info->fbops->fb_sync(info); 803 804 while (count) { 805 c = (count > PAGE_SIZE) ? PAGE_SIZE : count; 806 dst = buffer; 807 fb_memcpy_fromfb(dst, src, c); 808 dst += c; 809 src += c; 810 811 if (copy_to_user(buf, buffer, c)) { 812 err = -EFAULT; 813 break; 814 } 815 *ppos += c; 816 buf += c; 817 cnt += c; 818 count -= c; 819 } 820 821 kfree(buffer); 822 823 return (err) ? err : cnt; 824 } 825 826 static ssize_t 827 fb_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos) 828 { 829 unsigned long p = *ppos; 830 struct fb_info *info = file_fb_info(file); 831 u8 *buffer, *src; 832 u8 __iomem *dst; 833 int c, cnt = 0, err = 0; 834 unsigned long total_size; 835 836 if (!info || !info->screen_base) 837 return -ENODEV; 838 839 if (info->state != FBINFO_STATE_RUNNING) 840 return -EPERM; 841 842 if (info->fbops->fb_write) 843 return info->fbops->fb_write(info, buf, count, ppos); 844 845 total_size = info->screen_size; 846 847 if (total_size == 0) 848 total_size = info->fix.smem_len; 849 850 if (p > total_size) 851 return -EFBIG; 852 853 if (count > total_size) { 854 err = -EFBIG; 855 count = total_size; 856 } 857 858 if (count + p > total_size) { 859 if (!err) 860 err = -ENOSPC; 861 862 count = total_size - p; 863 } 864 865 buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count, 866 GFP_KERNEL); 867 if (!buffer) 868 return -ENOMEM; 869 870 dst = (u8 __iomem *) (info->screen_base + p); 871 872 if (info->fbops->fb_sync) 873 info->fbops->fb_sync(info); 874 875 while (count) { 876 c = (count > PAGE_SIZE) ? PAGE_SIZE : count; 877 src = buffer; 878 879 if (copy_from_user(src, buf, c)) { 880 err = -EFAULT; 881 break; 882 } 883 884 fb_memcpy_tofb(dst, src, c); 885 dst += c; 886 src += c; 887 *ppos += c; 888 buf += c; 889 cnt += c; 890 count -= c; 891 } 892 893 kfree(buffer); 894 895 return (cnt) ? cnt : err; 896 } 897 898 int 899 fb_pan_display(struct fb_info *info, struct fb_var_screeninfo *var) 900 { 901 struct fb_fix_screeninfo *fix = &info->fix; 902 unsigned int yres = info->var.yres; 903 int err = 0; 904 905 if (var->yoffset > 0) { 906 if (var->vmode & FB_VMODE_YWRAP) { 907 if (!fix->ywrapstep || (var->yoffset % fix->ywrapstep)) 908 err = -EINVAL; 909 else 910 yres = 0; 911 } else if (!fix->ypanstep || (var->yoffset % fix->ypanstep)) 912 err = -EINVAL; 913 } 914 915 if (var->xoffset > 0 && (!fix->xpanstep || 916 (var->xoffset % fix->xpanstep))) 917 err = -EINVAL; 918 919 if (err || !info->fbops->fb_pan_display || 920 var->yoffset > info->var.yres_virtual - yres || 921 var->xoffset > info->var.xres_virtual - info->var.xres) 922 return -EINVAL; 923 924 if ((err = info->fbops->fb_pan_display(var, info))) 925 return err; 926 info->var.xoffset = var->xoffset; 927 info->var.yoffset = var->yoffset; 928 if (var->vmode & FB_VMODE_YWRAP) 929 info->var.vmode |= FB_VMODE_YWRAP; 930 else 931 info->var.vmode &= ~FB_VMODE_YWRAP; 932 return 0; 933 } 934 EXPORT_SYMBOL(fb_pan_display); 935 936 static int fb_check_caps(struct fb_info *info, struct fb_var_screeninfo *var, 937 u32 activate) 938 { 939 struct fb_blit_caps caps, fbcaps; 940 int err = 0; 941 942 memset(&caps, 0, sizeof(caps)); 943 memset(&fbcaps, 0, sizeof(fbcaps)); 944 caps.flags = (activate & FB_ACTIVATE_ALL) ? 1 : 0; 945 fbcon_get_requirement(info, &caps); 946 info->fbops->fb_get_caps(info, &fbcaps, var); 947 948 if (((fbcaps.x ^ caps.x) & caps.x) || 949 ((fbcaps.y ^ caps.y) & caps.y) || 950 (fbcaps.len < caps.len)) 951 err = -EINVAL; 952 953 return err; 954 } 955 956 int 957 fb_set_var(struct fb_info *info, struct fb_var_screeninfo *var) 958 { 959 int ret = 0; 960 u32 activate; 961 struct fb_var_screeninfo old_var; 962 struct fb_videomode mode; 963 struct fb_event event; 964 u32 unused; 965 966 if (var->activate & FB_ACTIVATE_INV_MODE) { 967 struct fb_videomode mode1, mode2; 968 969 fb_var_to_videomode(&mode1, var); 970 fb_var_to_videomode(&mode2, &info->var); 971 /* make sure we don't delete the videomode of current var */ 972 ret = fb_mode_is_equal(&mode1, &mode2); 973 if (!ret) { 974 ret = fbcon_mode_deleted(info, &mode1); 975 if (!ret) 976 fb_delete_videomode(&mode1, &info->modelist); 977 } 978 979 return ret ? -EINVAL : 0; 980 } 981 982 if (!(var->activate & FB_ACTIVATE_FORCE) && 983 !memcmp(&info->var, var, sizeof(struct fb_var_screeninfo))) 984 return 0; 985 986 activate = var->activate; 987 988 /* When using FOURCC mode, make sure the red, green, blue and 989 * transp fields are set to 0. 990 */ 991 if ((info->fix.capabilities & FB_CAP_FOURCC) && 992 var->grayscale > 1) { 993 if (var->red.offset || var->green.offset || 994 var->blue.offset || var->transp.offset || 995 var->red.length || var->green.length || 996 var->blue.length || var->transp.length || 997 var->red.msb_right || var->green.msb_right || 998 var->blue.msb_right || var->transp.msb_right) 999 return -EINVAL; 1000 } 1001 1002 if (!info->fbops->fb_check_var) { 1003 *var = info->var; 1004 return 0; 1005 } 1006 1007 /* bitfill_aligned() assumes that it's at least 8x8 */ 1008 if (var->xres < 8 || var->yres < 8) 1009 return -EINVAL; 1010 1011 /* Too huge resolution causes multiplication overflow. */ 1012 if (check_mul_overflow(var->xres, var->yres, &unused) || 1013 check_mul_overflow(var->xres_virtual, var->yres_virtual, &unused)) 1014 return -EINVAL; 1015 1016 ret = info->fbops->fb_check_var(var, info); 1017 1018 if (ret) 1019 return ret; 1020 1021 /* verify that virtual resolution >= physical resolution */ 1022 if (var->xres_virtual < var->xres || 1023 var->yres_virtual < var->yres) { 1024 pr_warn("WARNING: fbcon: Driver '%s' missed to adjust virtual screen size (%ux%u vs. %ux%u)\n", 1025 info->fix.id, 1026 var->xres_virtual, var->yres_virtual, 1027 var->xres, var->yres); 1028 return -EINVAL; 1029 } 1030 1031 if ((var->activate & FB_ACTIVATE_MASK) != FB_ACTIVATE_NOW) 1032 return 0; 1033 1034 if (info->fbops->fb_get_caps) { 1035 ret = fb_check_caps(info, var, activate); 1036 1037 if (ret) 1038 return ret; 1039 } 1040 1041 old_var = info->var; 1042 info->var = *var; 1043 1044 if (info->fbops->fb_set_par) { 1045 ret = info->fbops->fb_set_par(info); 1046 1047 if (ret) { 1048 info->var = old_var; 1049 printk(KERN_WARNING "detected " 1050 "fb_set_par error, " 1051 "error code: %d\n", ret); 1052 return ret; 1053 } 1054 } 1055 1056 fb_pan_display(info, &info->var); 1057 fb_set_cmap(&info->cmap, info); 1058 fb_var_to_videomode(&mode, &info->var); 1059 1060 if (info->modelist.prev && info->modelist.next && 1061 !list_empty(&info->modelist)) 1062 ret = fb_add_videomode(&mode, &info->modelist); 1063 1064 if (ret) 1065 return ret; 1066 1067 event.info = info; 1068 event.data = &mode; 1069 fb_notifier_call_chain(FB_EVENT_MODE_CHANGE, &event); 1070 1071 return 0; 1072 } 1073 EXPORT_SYMBOL(fb_set_var); 1074 1075 int 1076 fb_blank(struct fb_info *info, int blank) 1077 { 1078 struct fb_event event; 1079 int ret = -EINVAL; 1080 1081 if (blank > FB_BLANK_POWERDOWN) 1082 blank = FB_BLANK_POWERDOWN; 1083 1084 event.info = info; 1085 event.data = ␣ 1086 1087 if (info->fbops->fb_blank) 1088 ret = info->fbops->fb_blank(blank, info); 1089 1090 if (!ret) 1091 fb_notifier_call_chain(FB_EVENT_BLANK, &event); 1092 1093 return ret; 1094 } 1095 EXPORT_SYMBOL(fb_blank); 1096 1097 static long do_fb_ioctl(struct fb_info *info, unsigned int cmd, 1098 unsigned long arg) 1099 { 1100 const struct fb_ops *fb; 1101 struct fb_var_screeninfo var; 1102 struct fb_fix_screeninfo fix; 1103 struct fb_cmap cmap_from; 1104 struct fb_cmap_user cmap; 1105 void __user *argp = (void __user *)arg; 1106 long ret = 0; 1107 1108 switch (cmd) { 1109 case FBIOGET_VSCREENINFO: 1110 lock_fb_info(info); 1111 var = info->var; 1112 unlock_fb_info(info); 1113 1114 ret = copy_to_user(argp, &var, sizeof(var)) ? -EFAULT : 0; 1115 break; 1116 case FBIOPUT_VSCREENINFO: 1117 if (copy_from_user(&var, argp, sizeof(var))) 1118 return -EFAULT; 1119 /* only for kernel-internal use */ 1120 var.activate &= ~FB_ACTIVATE_KD_TEXT; 1121 console_lock(); 1122 lock_fb_info(info); 1123 ret = fbcon_modechange_possible(info, &var); 1124 if (!ret) 1125 ret = fb_set_var(info, &var); 1126 if (!ret) 1127 fbcon_update_vcs(info, var.activate & FB_ACTIVATE_ALL); 1128 unlock_fb_info(info); 1129 console_unlock(); 1130 if (!ret && copy_to_user(argp, &var, sizeof(var))) 1131 ret = -EFAULT; 1132 break; 1133 case FBIOGET_FSCREENINFO: 1134 lock_fb_info(info); 1135 memcpy(&fix, &info->fix, sizeof(fix)); 1136 if (info->flags & FBINFO_HIDE_SMEM_START) 1137 fix.smem_start = 0; 1138 unlock_fb_info(info); 1139 1140 ret = copy_to_user(argp, &fix, sizeof(fix)) ? -EFAULT : 0; 1141 break; 1142 case FBIOPUTCMAP: 1143 if (copy_from_user(&cmap, argp, sizeof(cmap))) 1144 return -EFAULT; 1145 ret = fb_set_user_cmap(&cmap, info); 1146 break; 1147 case FBIOGETCMAP: 1148 if (copy_from_user(&cmap, argp, sizeof(cmap))) 1149 return -EFAULT; 1150 lock_fb_info(info); 1151 cmap_from = info->cmap; 1152 unlock_fb_info(info); 1153 ret = fb_cmap_to_user(&cmap_from, &cmap); 1154 break; 1155 case FBIOPAN_DISPLAY: 1156 if (copy_from_user(&var, argp, sizeof(var))) 1157 return -EFAULT; 1158 console_lock(); 1159 lock_fb_info(info); 1160 ret = fb_pan_display(info, &var); 1161 unlock_fb_info(info); 1162 console_unlock(); 1163 if (ret == 0 && copy_to_user(argp, &var, sizeof(var))) 1164 return -EFAULT; 1165 break; 1166 case FBIO_CURSOR: 1167 ret = -EINVAL; 1168 break; 1169 case FBIOGET_CON2FBMAP: 1170 ret = fbcon_get_con2fb_map_ioctl(argp); 1171 break; 1172 case FBIOPUT_CON2FBMAP: 1173 ret = fbcon_set_con2fb_map_ioctl(argp); 1174 break; 1175 case FBIOBLANK: 1176 if (arg > FB_BLANK_POWERDOWN) 1177 return -EINVAL; 1178 console_lock(); 1179 lock_fb_info(info); 1180 ret = fb_blank(info, arg); 1181 /* might again call into fb_blank */ 1182 fbcon_fb_blanked(info, arg); 1183 unlock_fb_info(info); 1184 console_unlock(); 1185 break; 1186 default: 1187 lock_fb_info(info); 1188 fb = info->fbops; 1189 if (fb->fb_ioctl) 1190 ret = fb->fb_ioctl(info, cmd, arg); 1191 else 1192 ret = -ENOTTY; 1193 unlock_fb_info(info); 1194 } 1195 return ret; 1196 } 1197 1198 static long fb_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 1199 { 1200 struct fb_info *info = file_fb_info(file); 1201 1202 if (!info) 1203 return -ENODEV; 1204 return do_fb_ioctl(info, cmd, arg); 1205 } 1206 1207 #ifdef CONFIG_COMPAT 1208 struct fb_fix_screeninfo32 { 1209 char id[16]; 1210 compat_caddr_t smem_start; 1211 u32 smem_len; 1212 u32 type; 1213 u32 type_aux; 1214 u32 visual; 1215 u16 xpanstep; 1216 u16 ypanstep; 1217 u16 ywrapstep; 1218 u32 line_length; 1219 compat_caddr_t mmio_start; 1220 u32 mmio_len; 1221 u32 accel; 1222 u16 reserved[3]; 1223 }; 1224 1225 struct fb_cmap32 { 1226 u32 start; 1227 u32 len; 1228 compat_caddr_t red; 1229 compat_caddr_t green; 1230 compat_caddr_t blue; 1231 compat_caddr_t transp; 1232 }; 1233 1234 static int fb_getput_cmap(struct fb_info *info, unsigned int cmd, 1235 unsigned long arg) 1236 { 1237 struct fb_cmap32 cmap32; 1238 struct fb_cmap cmap_from; 1239 struct fb_cmap_user cmap; 1240 1241 if (copy_from_user(&cmap32, compat_ptr(arg), sizeof(cmap32))) 1242 return -EFAULT; 1243 1244 cmap = (struct fb_cmap_user) { 1245 .start = cmap32.start, 1246 .len = cmap32.len, 1247 .red = compat_ptr(cmap32.red), 1248 .green = compat_ptr(cmap32.green), 1249 .blue = compat_ptr(cmap32.blue), 1250 .transp = compat_ptr(cmap32.transp), 1251 }; 1252 1253 if (cmd == FBIOPUTCMAP) 1254 return fb_set_user_cmap(&cmap, info); 1255 1256 lock_fb_info(info); 1257 cmap_from = info->cmap; 1258 unlock_fb_info(info); 1259 1260 return fb_cmap_to_user(&cmap_from, &cmap); 1261 } 1262 1263 static int do_fscreeninfo_to_user(struct fb_fix_screeninfo *fix, 1264 struct fb_fix_screeninfo32 __user *fix32) 1265 { 1266 __u32 data; 1267 int err; 1268 1269 err = copy_to_user(&fix32->id, &fix->id, sizeof(fix32->id)); 1270 1271 data = (__u32) (unsigned long) fix->smem_start; 1272 err |= put_user(data, &fix32->smem_start); 1273 1274 err |= put_user(fix->smem_len, &fix32->smem_len); 1275 err |= put_user(fix->type, &fix32->type); 1276 err |= put_user(fix->type_aux, &fix32->type_aux); 1277 err |= put_user(fix->visual, &fix32->visual); 1278 err |= put_user(fix->xpanstep, &fix32->xpanstep); 1279 err |= put_user(fix->ypanstep, &fix32->ypanstep); 1280 err |= put_user(fix->ywrapstep, &fix32->ywrapstep); 1281 err |= put_user(fix->line_length, &fix32->line_length); 1282 1283 data = (__u32) (unsigned long) fix->mmio_start; 1284 err |= put_user(data, &fix32->mmio_start); 1285 1286 err |= put_user(fix->mmio_len, &fix32->mmio_len); 1287 err |= put_user(fix->accel, &fix32->accel); 1288 err |= copy_to_user(fix32->reserved, fix->reserved, 1289 sizeof(fix->reserved)); 1290 1291 if (err) 1292 return -EFAULT; 1293 return 0; 1294 } 1295 1296 static int fb_get_fscreeninfo(struct fb_info *info, unsigned int cmd, 1297 unsigned long arg) 1298 { 1299 struct fb_fix_screeninfo fix; 1300 1301 lock_fb_info(info); 1302 fix = info->fix; 1303 if (info->flags & FBINFO_HIDE_SMEM_START) 1304 fix.smem_start = 0; 1305 unlock_fb_info(info); 1306 return do_fscreeninfo_to_user(&fix, compat_ptr(arg)); 1307 } 1308 1309 static long fb_compat_ioctl(struct file *file, unsigned int cmd, 1310 unsigned long arg) 1311 { 1312 struct fb_info *info = file_fb_info(file); 1313 const struct fb_ops *fb; 1314 long ret = -ENOIOCTLCMD; 1315 1316 if (!info) 1317 return -ENODEV; 1318 fb = info->fbops; 1319 switch(cmd) { 1320 case FBIOGET_VSCREENINFO: 1321 case FBIOPUT_VSCREENINFO: 1322 case FBIOPAN_DISPLAY: 1323 case FBIOGET_CON2FBMAP: 1324 case FBIOPUT_CON2FBMAP: 1325 arg = (unsigned long) compat_ptr(arg); 1326 fallthrough; 1327 case FBIOBLANK: 1328 ret = do_fb_ioctl(info, cmd, arg); 1329 break; 1330 1331 case FBIOGET_FSCREENINFO: 1332 ret = fb_get_fscreeninfo(info, cmd, arg); 1333 break; 1334 1335 case FBIOGETCMAP: 1336 case FBIOPUTCMAP: 1337 ret = fb_getput_cmap(info, cmd, arg); 1338 break; 1339 1340 default: 1341 if (fb->fb_compat_ioctl) 1342 ret = fb->fb_compat_ioctl(info, cmd, arg); 1343 break; 1344 } 1345 return ret; 1346 } 1347 #endif 1348 1349 static int 1350 fb_mmap(struct file *file, struct vm_area_struct * vma) 1351 { 1352 struct fb_info *info = file_fb_info(file); 1353 unsigned long mmio_pgoff; 1354 unsigned long start; 1355 u32 len; 1356 1357 if (!info) 1358 return -ENODEV; 1359 mutex_lock(&info->mm_lock); 1360 1361 if (info->fbops->fb_mmap) { 1362 int res; 1363 1364 /* 1365 * The framebuffer needs to be accessed decrypted, be sure 1366 * SME protection is removed ahead of the call 1367 */ 1368 vma->vm_page_prot = pgprot_decrypted(vma->vm_page_prot); 1369 res = info->fbops->fb_mmap(info, vma); 1370 mutex_unlock(&info->mm_lock); 1371 return res; 1372 #if IS_ENABLED(CONFIG_FB_DEFERRED_IO) 1373 } else if (info->fbdefio) { 1374 /* 1375 * FB deferred I/O wants you to handle mmap in your drivers. At a 1376 * minimum, point struct fb_ops.fb_mmap to fb_deferred_io_mmap(). 1377 */ 1378 dev_warn_once(info->dev, "fbdev mmap not set up for deferred I/O.\n"); 1379 mutex_unlock(&info->mm_lock); 1380 return -ENODEV; 1381 #endif 1382 } 1383 1384 /* 1385 * Ugh. This can be either the frame buffer mapping, or 1386 * if pgoff points past it, the mmio mapping. 1387 */ 1388 start = info->fix.smem_start; 1389 len = info->fix.smem_len; 1390 mmio_pgoff = PAGE_ALIGN((start & ~PAGE_MASK) + len) >> PAGE_SHIFT; 1391 if (vma->vm_pgoff >= mmio_pgoff) { 1392 if (info->var.accel_flags) { 1393 mutex_unlock(&info->mm_lock); 1394 return -EINVAL; 1395 } 1396 1397 vma->vm_pgoff -= mmio_pgoff; 1398 start = info->fix.mmio_start; 1399 len = info->fix.mmio_len; 1400 } 1401 mutex_unlock(&info->mm_lock); 1402 1403 vma->vm_page_prot = vm_get_page_prot(vma->vm_flags); 1404 fb_pgprotect(file, vma, start); 1405 1406 return vm_iomap_memory(vma, start, len); 1407 } 1408 1409 static int 1410 fb_open(struct inode *inode, struct file *file) 1411 __acquires(&info->lock) 1412 __releases(&info->lock) 1413 { 1414 int fbidx = iminor(inode); 1415 struct fb_info *info; 1416 int res = 0; 1417 1418 info = get_fb_info(fbidx); 1419 if (!info) { 1420 request_module("fb%d", fbidx); 1421 info = get_fb_info(fbidx); 1422 if (!info) 1423 return -ENODEV; 1424 } 1425 if (IS_ERR(info)) 1426 return PTR_ERR(info); 1427 1428 lock_fb_info(info); 1429 if (!try_module_get(info->fbops->owner)) { 1430 res = -ENODEV; 1431 goto out; 1432 } 1433 file->private_data = info; 1434 if (info->fbops->fb_open) { 1435 res = info->fbops->fb_open(info,1); 1436 if (res) 1437 module_put(info->fbops->owner); 1438 } 1439 #ifdef CONFIG_FB_DEFERRED_IO 1440 if (info->fbdefio) 1441 fb_deferred_io_open(info, inode, file); 1442 #endif 1443 out: 1444 unlock_fb_info(info); 1445 if (res) 1446 put_fb_info(info); 1447 return res; 1448 } 1449 1450 static int 1451 fb_release(struct inode *inode, struct file *file) 1452 __acquires(&info->lock) 1453 __releases(&info->lock) 1454 { 1455 struct fb_info * const info = file->private_data; 1456 1457 lock_fb_info(info); 1458 #if IS_ENABLED(CONFIG_FB_DEFERRED_IO) 1459 if (info->fbdefio) 1460 fb_deferred_io_release(info); 1461 #endif 1462 if (info->fbops->fb_release) 1463 info->fbops->fb_release(info,1); 1464 module_put(info->fbops->owner); 1465 unlock_fb_info(info); 1466 put_fb_info(info); 1467 return 0; 1468 } 1469 1470 #if defined(CONFIG_FB_PROVIDE_GET_FB_UNMAPPED_AREA) && !defined(CONFIG_MMU) 1471 static unsigned long get_fb_unmapped_area(struct file *filp, 1472 unsigned long addr, unsigned long len, 1473 unsigned long pgoff, unsigned long flags) 1474 { 1475 struct fb_info * const info = filp->private_data; 1476 unsigned long fb_size = PAGE_ALIGN(info->fix.smem_len); 1477 1478 if (pgoff > fb_size || len > fb_size - pgoff) 1479 return -EINVAL; 1480 1481 return (unsigned long)info->screen_base + pgoff; 1482 } 1483 #endif 1484 1485 static const struct file_operations fb_fops = { 1486 .owner = THIS_MODULE, 1487 .read = fb_read, 1488 .write = fb_write, 1489 .unlocked_ioctl = fb_ioctl, 1490 #ifdef CONFIG_COMPAT 1491 .compat_ioctl = fb_compat_ioctl, 1492 #endif 1493 .mmap = fb_mmap, 1494 .open = fb_open, 1495 .release = fb_release, 1496 #if defined(HAVE_ARCH_FB_UNMAPPED_AREA) || \ 1497 (defined(CONFIG_FB_PROVIDE_GET_FB_UNMAPPED_AREA) && \ 1498 !defined(CONFIG_MMU)) 1499 .get_unmapped_area = get_fb_unmapped_area, 1500 #endif 1501 #ifdef CONFIG_FB_DEFERRED_IO 1502 .fsync = fb_deferred_io_fsync, 1503 #endif 1504 .llseek = default_llseek, 1505 }; 1506 1507 struct class *fb_class; 1508 EXPORT_SYMBOL(fb_class); 1509 1510 static int fb_check_foreignness(struct fb_info *fi) 1511 { 1512 const bool foreign_endian = fi->flags & FBINFO_FOREIGN_ENDIAN; 1513 1514 fi->flags &= ~FBINFO_FOREIGN_ENDIAN; 1515 1516 #ifdef __BIG_ENDIAN 1517 fi->flags |= foreign_endian ? 0 : FBINFO_BE_MATH; 1518 #else 1519 fi->flags |= foreign_endian ? FBINFO_BE_MATH : 0; 1520 #endif /* __BIG_ENDIAN */ 1521 1522 if (fi->flags & FBINFO_BE_MATH && !fb_be_math(fi)) { 1523 pr_err("%s: enable CONFIG_FB_BIG_ENDIAN to " 1524 "support this framebuffer\n", fi->fix.id); 1525 return -ENOSYS; 1526 } else if (!(fi->flags & FBINFO_BE_MATH) && fb_be_math(fi)) { 1527 pr_err("%s: enable CONFIG_FB_LITTLE_ENDIAN to " 1528 "support this framebuffer\n", fi->fix.id); 1529 return -ENOSYS; 1530 } 1531 1532 return 0; 1533 } 1534 1535 static int do_register_framebuffer(struct fb_info *fb_info) 1536 { 1537 int i; 1538 struct fb_videomode mode; 1539 1540 if (fb_check_foreignness(fb_info)) 1541 return -ENOSYS; 1542 1543 if (num_registered_fb == FB_MAX) 1544 return -ENXIO; 1545 1546 num_registered_fb++; 1547 for (i = 0 ; i < FB_MAX; i++) 1548 if (!registered_fb[i]) 1549 break; 1550 fb_info->node = i; 1551 refcount_set(&fb_info->count, 1); 1552 mutex_init(&fb_info->lock); 1553 mutex_init(&fb_info->mm_lock); 1554 1555 fb_info->dev = device_create(fb_class, fb_info->device, 1556 MKDEV(FB_MAJOR, i), NULL, "fb%d", i); 1557 if (IS_ERR(fb_info->dev)) { 1558 /* Not fatal */ 1559 printk(KERN_WARNING "Unable to create device for framebuffer %d; errno = %ld\n", i, PTR_ERR(fb_info->dev)); 1560 fb_info->dev = NULL; 1561 } else 1562 fb_init_device(fb_info); 1563 1564 if (fb_info->pixmap.addr == NULL) { 1565 fb_info->pixmap.addr = kmalloc(FBPIXMAPSIZE, GFP_KERNEL); 1566 if (fb_info->pixmap.addr) { 1567 fb_info->pixmap.size = FBPIXMAPSIZE; 1568 fb_info->pixmap.buf_align = 1; 1569 fb_info->pixmap.scan_align = 1; 1570 fb_info->pixmap.access_align = 32; 1571 fb_info->pixmap.flags = FB_PIXMAP_DEFAULT; 1572 } 1573 } 1574 fb_info->pixmap.offset = 0; 1575 1576 if (!fb_info->pixmap.blit_x) 1577 fb_info->pixmap.blit_x = ~(u32)0; 1578 1579 if (!fb_info->pixmap.blit_y) 1580 fb_info->pixmap.blit_y = ~(u32)0; 1581 1582 if (!fb_info->modelist.prev || !fb_info->modelist.next) 1583 INIT_LIST_HEAD(&fb_info->modelist); 1584 1585 if (fb_info->skip_vt_switch) 1586 pm_vt_switch_required(fb_info->dev, false); 1587 else 1588 pm_vt_switch_required(fb_info->dev, true); 1589 1590 fb_var_to_videomode(&mode, &fb_info->var); 1591 fb_add_videomode(&mode, &fb_info->modelist); 1592 registered_fb[i] = fb_info; 1593 1594 #ifdef CONFIG_GUMSTIX_AM200EPD 1595 { 1596 struct fb_event event; 1597 event.info = fb_info; 1598 fb_notifier_call_chain(FB_EVENT_FB_REGISTERED, &event); 1599 } 1600 #endif 1601 1602 return fbcon_fb_registered(fb_info); 1603 } 1604 1605 static void unbind_console(struct fb_info *fb_info) 1606 { 1607 int i = fb_info->node; 1608 1609 if (WARN_ON(i < 0 || i >= FB_MAX || registered_fb[i] != fb_info)) 1610 return; 1611 1612 fbcon_fb_unbind(fb_info); 1613 } 1614 1615 static void unlink_framebuffer(struct fb_info *fb_info) 1616 { 1617 int i; 1618 1619 i = fb_info->node; 1620 if (WARN_ON(i < 0 || i >= FB_MAX || registered_fb[i] != fb_info)) 1621 return; 1622 1623 if (!fb_info->dev) 1624 return; 1625 1626 device_destroy(fb_class, MKDEV(FB_MAJOR, i)); 1627 1628 pm_vt_switch_unregister(fb_info->dev); 1629 1630 unbind_console(fb_info); 1631 1632 fb_info->dev = NULL; 1633 } 1634 1635 static void do_unregister_framebuffer(struct fb_info *fb_info) 1636 { 1637 unlink_framebuffer(fb_info); 1638 if (fb_info->pixmap.addr && 1639 (fb_info->pixmap.flags & FB_PIXMAP_DEFAULT)) { 1640 kfree(fb_info->pixmap.addr); 1641 fb_info->pixmap.addr = NULL; 1642 } 1643 1644 fb_destroy_modelist(&fb_info->modelist); 1645 registered_fb[fb_info->node] = NULL; 1646 num_registered_fb--; 1647 fb_cleanup_device(fb_info); 1648 #ifdef CONFIG_GUMSTIX_AM200EPD 1649 { 1650 struct fb_event event; 1651 event.info = fb_info; 1652 fb_notifier_call_chain(FB_EVENT_FB_UNREGISTERED, &event); 1653 } 1654 #endif 1655 fbcon_fb_unregistered(fb_info); 1656 1657 /* this may free fb info */ 1658 put_fb_info(fb_info); 1659 } 1660 1661 /** 1662 * register_framebuffer - registers a frame buffer device 1663 * @fb_info: frame buffer info structure 1664 * 1665 * Registers a frame buffer device @fb_info. 1666 * 1667 * Returns negative errno on error, or zero for success. 1668 * 1669 */ 1670 int 1671 register_framebuffer(struct fb_info *fb_info) 1672 { 1673 int ret; 1674 1675 mutex_lock(®istration_lock); 1676 ret = do_register_framebuffer(fb_info); 1677 mutex_unlock(®istration_lock); 1678 1679 return ret; 1680 } 1681 EXPORT_SYMBOL(register_framebuffer); 1682 1683 /** 1684 * unregister_framebuffer - releases a frame buffer device 1685 * @fb_info: frame buffer info structure 1686 * 1687 * Unregisters a frame buffer device @fb_info. 1688 * 1689 * Returns negative errno on error, or zero for success. 1690 * 1691 * This function will also notify the framebuffer console 1692 * to release the driver. 1693 * 1694 * This is meant to be called within a driver's module_exit() 1695 * function. If this is called outside module_exit(), ensure 1696 * that the driver implements fb_open() and fb_release() to 1697 * check that no processes are using the device. 1698 */ 1699 void 1700 unregister_framebuffer(struct fb_info *fb_info) 1701 { 1702 mutex_lock(®istration_lock); 1703 do_unregister_framebuffer(fb_info); 1704 mutex_unlock(®istration_lock); 1705 } 1706 EXPORT_SYMBOL(unregister_framebuffer); 1707 1708 /** 1709 * fb_set_suspend - low level driver signals suspend 1710 * @info: framebuffer affected 1711 * @state: 0 = resuming, !=0 = suspending 1712 * 1713 * This is meant to be used by low level drivers to 1714 * signal suspend/resume to the core & clients. 1715 * It must be called with the console semaphore held 1716 */ 1717 void fb_set_suspend(struct fb_info *info, int state) 1718 { 1719 WARN_CONSOLE_UNLOCKED(); 1720 1721 if (state) { 1722 fbcon_suspended(info); 1723 info->state = FBINFO_STATE_SUSPENDED; 1724 } else { 1725 info->state = FBINFO_STATE_RUNNING; 1726 fbcon_resumed(info); 1727 } 1728 } 1729 EXPORT_SYMBOL(fb_set_suspend); 1730 1731 /** 1732 * fbmem_init - init frame buffer subsystem 1733 * 1734 * Initialize the frame buffer subsystem. 1735 * 1736 * NOTE: This function is _only_ to be called by drivers/char/mem.c. 1737 * 1738 */ 1739 1740 static int __init 1741 fbmem_init(void) 1742 { 1743 int ret; 1744 1745 if (!proc_create_seq("fb", 0, NULL, &proc_fb_seq_ops)) 1746 return -ENOMEM; 1747 1748 ret = register_chrdev(FB_MAJOR, "fb", &fb_fops); 1749 if (ret) { 1750 printk("unable to get major %d for fb devs\n", FB_MAJOR); 1751 goto err_chrdev; 1752 } 1753 1754 fb_class = class_create("graphics"); 1755 if (IS_ERR(fb_class)) { 1756 ret = PTR_ERR(fb_class); 1757 pr_warn("Unable to create fb class; errno = %d\n", ret); 1758 fb_class = NULL; 1759 goto err_class; 1760 } 1761 1762 fb_console_init(); 1763 1764 return 0; 1765 1766 err_class: 1767 unregister_chrdev(FB_MAJOR, "fb"); 1768 err_chrdev: 1769 remove_proc_entry("fb", NULL); 1770 return ret; 1771 } 1772 1773 #ifdef MODULE 1774 module_init(fbmem_init); 1775 static void __exit 1776 fbmem_exit(void) 1777 { 1778 fb_console_exit(); 1779 1780 remove_proc_entry("fb", NULL); 1781 class_destroy(fb_class); 1782 unregister_chrdev(FB_MAJOR, "fb"); 1783 } 1784 1785 module_exit(fbmem_exit); 1786 MODULE_LICENSE("GPL"); 1787 MODULE_DESCRIPTION("Framebuffer base"); 1788 #else 1789 subsys_initcall(fbmem_init); 1790 #endif 1791 1792 int fb_new_modelist(struct fb_info *info) 1793 { 1794 struct fb_var_screeninfo var = info->var; 1795 struct list_head *pos, *n; 1796 struct fb_modelist *modelist; 1797 struct fb_videomode *m, mode; 1798 int err; 1799 1800 list_for_each_safe(pos, n, &info->modelist) { 1801 modelist = list_entry(pos, struct fb_modelist, list); 1802 m = &modelist->mode; 1803 fb_videomode_to_var(&var, m); 1804 var.activate = FB_ACTIVATE_TEST; 1805 err = fb_set_var(info, &var); 1806 fb_var_to_videomode(&mode, &var); 1807 if (err || !fb_mode_is_equal(m, &mode)) { 1808 list_del(pos); 1809 kfree(pos); 1810 } 1811 } 1812 1813 if (list_empty(&info->modelist)) 1814 return 1; 1815 1816 fbcon_new_modelist(info); 1817 1818 return 0; 1819 } 1820 1821 #if defined(CONFIG_VIDEO_NOMODESET) 1822 bool fb_modesetting_disabled(const char *drvname) 1823 { 1824 bool fwonly = video_firmware_drivers_only(); 1825 1826 if (fwonly) 1827 pr_warn("Driver %s not loading because of nomodeset parameter\n", 1828 drvname); 1829 1830 return fwonly; 1831 } 1832 EXPORT_SYMBOL(fb_modesetting_disabled); 1833 #endif 1834 1835 MODULE_LICENSE("GPL"); 1836