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/aperture.h> 17 #include <linux/compat.h> 18 #include <linux/types.h> 19 #include <linux/errno.h> 20 #include <linux/kernel.h> 21 #include <linux/major.h> 22 #include <linux/slab.h> 23 #include <linux/mm.h> 24 #include <linux/mman.h> 25 #include <linux/vt.h> 26 #include <linux/init.h> 27 #include <linux/linux_logo.h> 28 #include <linux/proc_fs.h> 29 #include <linux/platform_device.h> 30 #include <linux/seq_file.h> 31 #include <linux/console.h> 32 #include <linux/kmod.h> 33 #include <linux/err.h> 34 #include <linux/device.h> 35 #include <linux/efi.h> 36 #include <linux/fb.h> 37 #include <linux/fbcon.h> 38 #include <linux/mem_encrypt.h> 39 #include <linux/pci.h> 40 41 #include <asm/fb.h> 42 43 #include <video/nomodeset.h> 44 #include <video/vga.h> 45 46 /* 47 * Frame buffer device initialization and setup routines 48 */ 49 50 #define FBPIXMAPSIZE (1024 * 8) 51 52 static DEFINE_MUTEX(registration_lock); 53 54 struct fb_info *registered_fb[FB_MAX] __read_mostly; 55 int num_registered_fb __read_mostly; 56 #define for_each_registered_fb(i) \ 57 for (i = 0; i < FB_MAX; i++) \ 58 if (!registered_fb[i]) {} else 59 60 bool fb_center_logo __read_mostly; 61 62 int fb_logo_count __read_mostly = -1; 63 64 static struct fb_info *get_fb_info(unsigned int idx) 65 { 66 struct fb_info *fb_info; 67 68 if (idx >= FB_MAX) 69 return ERR_PTR(-ENODEV); 70 71 mutex_lock(®istration_lock); 72 fb_info = registered_fb[idx]; 73 if (fb_info) 74 refcount_inc(&fb_info->count); 75 mutex_unlock(®istration_lock); 76 77 return fb_info; 78 } 79 80 static void put_fb_info(struct fb_info *fb_info) 81 { 82 if (!refcount_dec_and_test(&fb_info->count)) 83 return; 84 if (fb_info->fbops->fb_destroy) 85 fb_info->fbops->fb_destroy(fb_info); 86 } 87 88 /* 89 * Helpers 90 */ 91 92 int fb_get_color_depth(struct fb_var_screeninfo *var, 93 struct fb_fix_screeninfo *fix) 94 { 95 int depth = 0; 96 97 if (fix->visual == FB_VISUAL_MONO01 || 98 fix->visual == FB_VISUAL_MONO10) 99 depth = 1; 100 else { 101 if (var->green.length == var->blue.length && 102 var->green.length == var->red.length && 103 var->green.offset == var->blue.offset && 104 var->green.offset == var->red.offset) 105 depth = var->green.length; 106 else 107 depth = var->green.length + var->red.length + 108 var->blue.length; 109 } 110 111 return depth; 112 } 113 EXPORT_SYMBOL(fb_get_color_depth); 114 115 /* 116 * Data padding functions. 117 */ 118 void fb_pad_aligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 s_pitch, u32 height) 119 { 120 __fb_pad_aligned_buffer(dst, d_pitch, src, s_pitch, height); 121 } 122 EXPORT_SYMBOL(fb_pad_aligned_buffer); 123 124 void fb_pad_unaligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 idx, u32 height, 125 u32 shift_high, u32 shift_low, u32 mod) 126 { 127 u8 mask = (u8) (0xfff << shift_high), tmp; 128 int i, j; 129 130 for (i = height; i--; ) { 131 for (j = 0; j < idx; j++) { 132 tmp = dst[j]; 133 tmp &= mask; 134 tmp |= *src >> shift_low; 135 dst[j] = tmp; 136 tmp = *src << shift_high; 137 dst[j+1] = tmp; 138 src++; 139 } 140 tmp = dst[idx]; 141 tmp &= mask; 142 tmp |= *src >> shift_low; 143 dst[idx] = tmp; 144 if (shift_high < mod) { 145 tmp = *src << shift_high; 146 dst[idx+1] = tmp; 147 } 148 src++; 149 dst += d_pitch; 150 } 151 } 152 EXPORT_SYMBOL(fb_pad_unaligned_buffer); 153 154 /* 155 * we need to lock this section since fb_cursor 156 * may use fb_imageblit() 157 */ 158 char* fb_get_buffer_offset(struct fb_info *info, struct fb_pixmap *buf, u32 size) 159 { 160 u32 align = buf->buf_align - 1, offset; 161 char *addr = buf->addr; 162 163 /* If IO mapped, we need to sync before access, no sharing of 164 * the pixmap is done 165 */ 166 if (buf->flags & FB_PIXMAP_IO) { 167 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC)) 168 info->fbops->fb_sync(info); 169 return addr; 170 } 171 172 /* See if we fit in the remaining pixmap space */ 173 offset = buf->offset + align; 174 offset &= ~align; 175 if (offset + size > buf->size) { 176 /* We do not fit. In order to be able to re-use the buffer, 177 * we must ensure no asynchronous DMA'ing or whatever operation 178 * is in progress, we sync for that. 179 */ 180 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC)) 181 info->fbops->fb_sync(info); 182 offset = 0; 183 } 184 buf->offset = offset + size; 185 addr += offset; 186 187 return addr; 188 } 189 EXPORT_SYMBOL(fb_get_buffer_offset); 190 191 #ifdef CONFIG_LOGO 192 193 static inline unsigned safe_shift(unsigned d, int n) 194 { 195 return n < 0 ? d >> -n : d << n; 196 } 197 198 static void fb_set_logocmap(struct fb_info *info, 199 const struct linux_logo *logo) 200 { 201 struct fb_cmap palette_cmap; 202 u16 palette_green[16]; 203 u16 palette_blue[16]; 204 u16 palette_red[16]; 205 int i, j, n; 206 const unsigned char *clut = logo->clut; 207 208 palette_cmap.start = 0; 209 palette_cmap.len = 16; 210 palette_cmap.red = palette_red; 211 palette_cmap.green = palette_green; 212 palette_cmap.blue = palette_blue; 213 palette_cmap.transp = NULL; 214 215 for (i = 0; i < logo->clutsize; i += n) { 216 n = logo->clutsize - i; 217 /* palette_cmap provides space for only 16 colors at once */ 218 if (n > 16) 219 n = 16; 220 palette_cmap.start = 32 + i; 221 palette_cmap.len = n; 222 for (j = 0; j < n; ++j) { 223 palette_cmap.red[j] = clut[0] << 8 | clut[0]; 224 palette_cmap.green[j] = clut[1] << 8 | clut[1]; 225 palette_cmap.blue[j] = clut[2] << 8 | clut[2]; 226 clut += 3; 227 } 228 fb_set_cmap(&palette_cmap, info); 229 } 230 } 231 232 static void fb_set_logo_truepalette(struct fb_info *info, 233 const struct linux_logo *logo, 234 u32 *palette) 235 { 236 static const unsigned char mask[] = { 0,0x80,0xc0,0xe0,0xf0,0xf8,0xfc,0xfe,0xff }; 237 unsigned char redmask, greenmask, bluemask; 238 int redshift, greenshift, blueshift; 239 int i; 240 const unsigned char *clut = logo->clut; 241 242 /* 243 * We have to create a temporary palette since console palette is only 244 * 16 colors long. 245 */ 246 /* Bug: Doesn't obey msb_right ... (who needs that?) */ 247 redmask = mask[info->var.red.length < 8 ? info->var.red.length : 8]; 248 greenmask = mask[info->var.green.length < 8 ? info->var.green.length : 8]; 249 bluemask = mask[info->var.blue.length < 8 ? info->var.blue.length : 8]; 250 redshift = info->var.red.offset - (8 - info->var.red.length); 251 greenshift = info->var.green.offset - (8 - info->var.green.length); 252 blueshift = info->var.blue.offset - (8 - info->var.blue.length); 253 254 for ( i = 0; i < logo->clutsize; i++) { 255 palette[i+32] = (safe_shift((clut[0] & redmask), redshift) | 256 safe_shift((clut[1] & greenmask), greenshift) | 257 safe_shift((clut[2] & bluemask), blueshift)); 258 clut += 3; 259 } 260 } 261 262 static void fb_set_logo_directpalette(struct fb_info *info, 263 const struct linux_logo *logo, 264 u32 *palette) 265 { 266 int redshift, greenshift, blueshift; 267 int i; 268 269 redshift = info->var.red.offset; 270 greenshift = info->var.green.offset; 271 blueshift = info->var.blue.offset; 272 273 for (i = 32; i < 32 + logo->clutsize; i++) 274 palette[i] = i << redshift | i << greenshift | i << blueshift; 275 } 276 277 static void fb_set_logo(struct fb_info *info, 278 const struct linux_logo *logo, u8 *dst, 279 int depth) 280 { 281 int i, j, k; 282 const u8 *src = logo->data; 283 u8 xor = (info->fix.visual == FB_VISUAL_MONO01) ? 0xff : 0; 284 u8 fg = 1, d; 285 286 switch (fb_get_color_depth(&info->var, &info->fix)) { 287 case 1: 288 fg = 1; 289 break; 290 case 2: 291 fg = 3; 292 break; 293 default: 294 fg = 7; 295 break; 296 } 297 298 if (info->fix.visual == FB_VISUAL_MONO01 || 299 info->fix.visual == FB_VISUAL_MONO10) 300 fg = ~((u8) (0xfff << info->var.green.length)); 301 302 switch (depth) { 303 case 4: 304 for (i = 0; i < logo->height; i++) 305 for (j = 0; j < logo->width; src++) { 306 *dst++ = *src >> 4; 307 j++; 308 if (j < logo->width) { 309 *dst++ = *src & 0x0f; 310 j++; 311 } 312 } 313 break; 314 case 1: 315 for (i = 0; i < logo->height; i++) { 316 for (j = 0; j < logo->width; src++) { 317 d = *src ^ xor; 318 for (k = 7; k >= 0 && j < logo->width; k--) { 319 *dst++ = ((d >> k) & 1) ? fg : 0; 320 j++; 321 } 322 } 323 } 324 break; 325 } 326 } 327 328 /* 329 * Three (3) kinds of logo maps exist. linux_logo_clut224 (>16 colors), 330 * linux_logo_vga16 (16 colors) and linux_logo_mono (2 colors). Depending on 331 * the visual format and color depth of the framebuffer, the DAC, the 332 * pseudo_palette, and the logo data will be adjusted accordingly. 333 * 334 * Case 1 - linux_logo_clut224: 335 * Color exceeds the number of console colors (16), thus we set the hardware DAC 336 * using fb_set_cmap() appropriately. The "needs_cmapreset" flag will be set. 337 * 338 * For visuals that require color info from the pseudo_palette, we also construct 339 * one for temporary use. The "needs_directpalette" or "needs_truepalette" flags 340 * will be set. 341 * 342 * Case 2 - linux_logo_vga16: 343 * The number of colors just matches the console colors, thus there is no need 344 * to set the DAC or the pseudo_palette. However, the bitmap is packed, ie, 345 * each byte contains color information for two pixels (upper and lower nibble). 346 * To be consistent with fb_imageblit() usage, we therefore separate the two 347 * nibbles into separate bytes. The "depth" flag will be set to 4. 348 * 349 * Case 3 - linux_logo_mono: 350 * This is similar with Case 2. Each byte contains information for 8 pixels. 351 * We isolate each bit and expand each into a byte. The "depth" flag will 352 * be set to 1. 353 */ 354 static struct logo_data { 355 int depth; 356 int needs_directpalette; 357 int needs_truepalette; 358 int needs_cmapreset; 359 const struct linux_logo *logo; 360 } fb_logo __read_mostly; 361 362 static void fb_rotate_logo_ud(const u8 *in, u8 *out, u32 width, u32 height) 363 { 364 u32 size = width * height, i; 365 366 out += size - 1; 367 368 for (i = size; i--; ) 369 *out-- = *in++; 370 } 371 372 static void fb_rotate_logo_cw(const u8 *in, u8 *out, u32 width, u32 height) 373 { 374 int i, j, h = height - 1; 375 376 for (i = 0; i < height; i++) 377 for (j = 0; j < width; j++) 378 out[height * j + h - i] = *in++; 379 } 380 381 static void fb_rotate_logo_ccw(const u8 *in, u8 *out, u32 width, u32 height) 382 { 383 int i, j, w = width - 1; 384 385 for (i = 0; i < height; i++) 386 for (j = 0; j < width; j++) 387 out[height * (w - j) + i] = *in++; 388 } 389 390 static void fb_rotate_logo(struct fb_info *info, u8 *dst, 391 struct fb_image *image, int rotate) 392 { 393 u32 tmp; 394 395 if (rotate == FB_ROTATE_UD) { 396 fb_rotate_logo_ud(image->data, dst, image->width, 397 image->height); 398 image->dx = info->var.xres - image->width - image->dx; 399 image->dy = info->var.yres - image->height - image->dy; 400 } else if (rotate == FB_ROTATE_CW) { 401 fb_rotate_logo_cw(image->data, dst, image->width, 402 image->height); 403 swap(image->width, image->height); 404 tmp = image->dy; 405 image->dy = image->dx; 406 image->dx = info->var.xres - image->width - tmp; 407 } else if (rotate == FB_ROTATE_CCW) { 408 fb_rotate_logo_ccw(image->data, dst, image->width, 409 image->height); 410 swap(image->width, image->height); 411 tmp = image->dx; 412 image->dx = image->dy; 413 image->dy = info->var.yres - image->height - tmp; 414 } 415 416 image->data = dst; 417 } 418 419 static void fb_do_show_logo(struct fb_info *info, struct fb_image *image, 420 int rotate, unsigned int num) 421 { 422 unsigned int x; 423 424 if (image->width > info->var.xres || image->height > info->var.yres) 425 return; 426 427 if (rotate == FB_ROTATE_UR) { 428 for (x = 0; 429 x < num && image->dx + image->width <= info->var.xres; 430 x++) { 431 info->fbops->fb_imageblit(info, image); 432 image->dx += image->width + 8; 433 } 434 } else if (rotate == FB_ROTATE_UD) { 435 u32 dx = image->dx; 436 437 for (x = 0; x < num && image->dx <= dx; x++) { 438 info->fbops->fb_imageblit(info, image); 439 image->dx -= image->width + 8; 440 } 441 } else if (rotate == FB_ROTATE_CW) { 442 for (x = 0; 443 x < num && image->dy + image->height <= info->var.yres; 444 x++) { 445 info->fbops->fb_imageblit(info, image); 446 image->dy += image->height + 8; 447 } 448 } else if (rotate == FB_ROTATE_CCW) { 449 u32 dy = image->dy; 450 451 for (x = 0; x < num && image->dy <= dy; x++) { 452 info->fbops->fb_imageblit(info, image); 453 image->dy -= image->height + 8; 454 } 455 } 456 } 457 458 static int fb_show_logo_line(struct fb_info *info, int rotate, 459 const struct linux_logo *logo, int y, 460 unsigned int n) 461 { 462 u32 *palette = NULL, *saved_pseudo_palette = NULL; 463 unsigned char *logo_new = NULL, *logo_rotate = NULL; 464 struct fb_image image; 465 466 /* Return if the frame buffer is not mapped or suspended */ 467 if (logo == NULL || info->state != FBINFO_STATE_RUNNING || 468 info->fbops->owner) 469 return 0; 470 471 image.depth = 8; 472 image.data = logo->data; 473 474 if (fb_logo.needs_cmapreset) 475 fb_set_logocmap(info, logo); 476 477 if (fb_logo.needs_truepalette || 478 fb_logo.needs_directpalette) { 479 palette = kmalloc(256 * 4, GFP_KERNEL); 480 if (palette == NULL) 481 return 0; 482 483 if (fb_logo.needs_truepalette) 484 fb_set_logo_truepalette(info, logo, palette); 485 else 486 fb_set_logo_directpalette(info, logo, palette); 487 488 saved_pseudo_palette = info->pseudo_palette; 489 info->pseudo_palette = palette; 490 } 491 492 if (fb_logo.depth <= 4) { 493 logo_new = kmalloc_array(logo->width, logo->height, 494 GFP_KERNEL); 495 if (logo_new == NULL) { 496 kfree(palette); 497 if (saved_pseudo_palette) 498 info->pseudo_palette = saved_pseudo_palette; 499 return 0; 500 } 501 image.data = logo_new; 502 fb_set_logo(info, logo, logo_new, fb_logo.depth); 503 } 504 505 if (fb_center_logo) { 506 int xres = info->var.xres; 507 int yres = info->var.yres; 508 509 if (rotate == FB_ROTATE_CW || rotate == FB_ROTATE_CCW) { 510 xres = info->var.yres; 511 yres = info->var.xres; 512 } 513 514 while (n && (n * (logo->width + 8) - 8 > xres)) 515 --n; 516 image.dx = (xres - (n * (logo->width + 8) - 8)) / 2; 517 image.dy = y ?: (yres - logo->height) / 2; 518 } else { 519 image.dx = 0; 520 image.dy = y; 521 } 522 523 image.width = logo->width; 524 image.height = logo->height; 525 526 if (rotate) { 527 logo_rotate = kmalloc_array(logo->width, logo->height, 528 GFP_KERNEL); 529 if (logo_rotate) 530 fb_rotate_logo(info, logo_rotate, &image, rotate); 531 } 532 533 fb_do_show_logo(info, &image, rotate, n); 534 535 kfree(palette); 536 if (saved_pseudo_palette != NULL) 537 info->pseudo_palette = saved_pseudo_palette; 538 kfree(logo_new); 539 kfree(logo_rotate); 540 return image.dy + logo->height; 541 } 542 543 544 #ifdef CONFIG_FB_LOGO_EXTRA 545 546 #define FB_LOGO_EX_NUM_MAX 10 547 static struct logo_data_extra { 548 const struct linux_logo *logo; 549 unsigned int n; 550 } fb_logo_ex[FB_LOGO_EX_NUM_MAX]; 551 static unsigned int fb_logo_ex_num; 552 553 void fb_append_extra_logo(const struct linux_logo *logo, unsigned int n) 554 { 555 if (!n || fb_logo_ex_num == FB_LOGO_EX_NUM_MAX) 556 return; 557 558 fb_logo_ex[fb_logo_ex_num].logo = logo; 559 fb_logo_ex[fb_logo_ex_num].n = n; 560 fb_logo_ex_num++; 561 } 562 563 static int fb_prepare_extra_logos(struct fb_info *info, unsigned int height, 564 unsigned int yres) 565 { 566 unsigned int i; 567 568 /* FIXME: logo_ex supports only truecolor fb. */ 569 if (info->fix.visual != FB_VISUAL_TRUECOLOR) 570 fb_logo_ex_num = 0; 571 572 for (i = 0; i < fb_logo_ex_num; i++) { 573 if (fb_logo_ex[i].logo->type != fb_logo.logo->type) { 574 fb_logo_ex[i].logo = NULL; 575 continue; 576 } 577 height += fb_logo_ex[i].logo->height; 578 if (height > yres) { 579 height -= fb_logo_ex[i].logo->height; 580 fb_logo_ex_num = i; 581 break; 582 } 583 } 584 return height; 585 } 586 587 static int fb_show_extra_logos(struct fb_info *info, int y, int rotate) 588 { 589 unsigned int i; 590 591 for (i = 0; i < fb_logo_ex_num; i++) 592 y = fb_show_logo_line(info, rotate, 593 fb_logo_ex[i].logo, y, fb_logo_ex[i].n); 594 595 return y; 596 } 597 598 #else /* !CONFIG_FB_LOGO_EXTRA */ 599 600 static inline int fb_prepare_extra_logos(struct fb_info *info, 601 unsigned int height, 602 unsigned int yres) 603 { 604 return height; 605 } 606 607 static inline int fb_show_extra_logos(struct fb_info *info, int y, int rotate) 608 { 609 return y; 610 } 611 612 #endif /* CONFIG_FB_LOGO_EXTRA */ 613 614 615 int fb_prepare_logo(struct fb_info *info, int rotate) 616 { 617 int depth = fb_get_color_depth(&info->var, &info->fix); 618 unsigned int yres; 619 int height; 620 621 memset(&fb_logo, 0, sizeof(struct logo_data)); 622 623 if (info->flags & FBINFO_MISC_TILEBLITTING || 624 info->fbops->owner || !fb_logo_count) 625 return 0; 626 627 if (info->fix.visual == FB_VISUAL_DIRECTCOLOR) { 628 depth = info->var.blue.length; 629 if (info->var.red.length < depth) 630 depth = info->var.red.length; 631 if (info->var.green.length < depth) 632 depth = info->var.green.length; 633 } 634 635 if (info->fix.visual == FB_VISUAL_STATIC_PSEUDOCOLOR && depth > 4) { 636 /* assume console colormap */ 637 depth = 4; 638 } 639 640 /* Return if no suitable logo was found */ 641 fb_logo.logo = fb_find_logo(depth); 642 643 if (!fb_logo.logo) { 644 return 0; 645 } 646 647 if (rotate == FB_ROTATE_UR || rotate == FB_ROTATE_UD) 648 yres = info->var.yres; 649 else 650 yres = info->var.xres; 651 652 if (fb_logo.logo->height > yres) { 653 fb_logo.logo = NULL; 654 return 0; 655 } 656 657 /* What depth we asked for might be different from what we get */ 658 if (fb_logo.logo->type == LINUX_LOGO_CLUT224) 659 fb_logo.depth = 8; 660 else if (fb_logo.logo->type == LINUX_LOGO_VGA16) 661 fb_logo.depth = 4; 662 else 663 fb_logo.depth = 1; 664 665 666 if (fb_logo.depth > 4 && depth > 4) { 667 switch (info->fix.visual) { 668 case FB_VISUAL_TRUECOLOR: 669 fb_logo.needs_truepalette = 1; 670 break; 671 case FB_VISUAL_DIRECTCOLOR: 672 fb_logo.needs_directpalette = 1; 673 fb_logo.needs_cmapreset = 1; 674 break; 675 case FB_VISUAL_PSEUDOCOLOR: 676 fb_logo.needs_cmapreset = 1; 677 break; 678 } 679 } 680 681 height = fb_logo.logo->height; 682 if (fb_center_logo) 683 height += (yres - fb_logo.logo->height) / 2; 684 685 return fb_prepare_extra_logos(info, height, yres); 686 } 687 688 int fb_show_logo(struct fb_info *info, int rotate) 689 { 690 unsigned int count; 691 int y; 692 693 if (!fb_logo_count) 694 return 0; 695 696 count = fb_logo_count < 0 ? num_online_cpus() : fb_logo_count; 697 y = fb_show_logo_line(info, rotate, fb_logo.logo, 0, count); 698 y = fb_show_extra_logos(info, y, rotate); 699 700 return y; 701 } 702 #else 703 int fb_prepare_logo(struct fb_info *info, int rotate) { return 0; } 704 int fb_show_logo(struct fb_info *info, int rotate) { return 0; } 705 #endif /* CONFIG_LOGO */ 706 EXPORT_SYMBOL(fb_prepare_logo); 707 EXPORT_SYMBOL(fb_show_logo); 708 709 static void *fb_seq_start(struct seq_file *m, loff_t *pos) 710 { 711 mutex_lock(®istration_lock); 712 return (*pos < FB_MAX) ? pos : NULL; 713 } 714 715 static void *fb_seq_next(struct seq_file *m, void *v, loff_t *pos) 716 { 717 (*pos)++; 718 return (*pos < FB_MAX) ? pos : NULL; 719 } 720 721 static void fb_seq_stop(struct seq_file *m, void *v) 722 { 723 mutex_unlock(®istration_lock); 724 } 725 726 static int fb_seq_show(struct seq_file *m, void *v) 727 { 728 int i = *(loff_t *)v; 729 struct fb_info *fi = registered_fb[i]; 730 731 if (fi) 732 seq_printf(m, "%d %s\n", fi->node, fi->fix.id); 733 return 0; 734 } 735 736 static const struct seq_operations __maybe_unused proc_fb_seq_ops = { 737 .start = fb_seq_start, 738 .next = fb_seq_next, 739 .stop = fb_seq_stop, 740 .show = fb_seq_show, 741 }; 742 743 /* 744 * We hold a reference to the fb_info in file->private_data, 745 * but if the current registered fb has changed, we don't 746 * actually want to use it. 747 * 748 * So look up the fb_info using the inode minor number, 749 * and just verify it against the reference we have. 750 */ 751 static struct fb_info *file_fb_info(struct file *file) 752 { 753 struct inode *inode = file_inode(file); 754 int fbidx = iminor(inode); 755 struct fb_info *info = registered_fb[fbidx]; 756 757 if (info != file->private_data) 758 info = NULL; 759 return info; 760 } 761 762 static ssize_t 763 fb_read(struct file *file, char __user *buf, size_t count, loff_t *ppos) 764 { 765 unsigned long p = *ppos; 766 struct fb_info *info = file_fb_info(file); 767 u8 *buffer, *dst; 768 u8 __iomem *src; 769 int c, cnt = 0, err = 0; 770 unsigned long total_size; 771 772 if (!info || ! info->screen_base) 773 return -ENODEV; 774 775 if (info->state != FBINFO_STATE_RUNNING) 776 return -EPERM; 777 778 if (info->fbops->fb_read) 779 return info->fbops->fb_read(info, buf, count, ppos); 780 781 total_size = info->screen_size; 782 783 if (total_size == 0) 784 total_size = info->fix.smem_len; 785 786 if (p >= total_size) 787 return 0; 788 789 if (count >= total_size) 790 count = total_size; 791 792 if (count + p > total_size) 793 count = total_size - p; 794 795 buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count, 796 GFP_KERNEL); 797 if (!buffer) 798 return -ENOMEM; 799 800 src = (u8 __iomem *) (info->screen_base + p); 801 802 if (info->fbops->fb_sync) 803 info->fbops->fb_sync(info); 804 805 while (count) { 806 c = (count > PAGE_SIZE) ? PAGE_SIZE : count; 807 dst = buffer; 808 fb_memcpy_fromfb(dst, src, c); 809 dst += c; 810 src += c; 811 812 if (copy_to_user(buf, buffer, c)) { 813 err = -EFAULT; 814 break; 815 } 816 *ppos += c; 817 buf += c; 818 cnt += c; 819 count -= c; 820 } 821 822 kfree(buffer); 823 824 return (err) ? err : cnt; 825 } 826 827 static ssize_t 828 fb_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos) 829 { 830 unsigned long p = *ppos; 831 struct fb_info *info = file_fb_info(file); 832 u8 *buffer, *src; 833 u8 __iomem *dst; 834 int c, cnt = 0, err = 0; 835 unsigned long total_size; 836 837 if (!info || !info->screen_base) 838 return -ENODEV; 839 840 if (info->state != FBINFO_STATE_RUNNING) 841 return -EPERM; 842 843 if (info->fbops->fb_write) 844 return info->fbops->fb_write(info, buf, count, ppos); 845 846 total_size = info->screen_size; 847 848 if (total_size == 0) 849 total_size = info->fix.smem_len; 850 851 if (p > total_size) 852 return -EFBIG; 853 854 if (count > total_size) { 855 err = -EFBIG; 856 count = total_size; 857 } 858 859 if (count + p > total_size) { 860 if (!err) 861 err = -ENOSPC; 862 863 count = total_size - p; 864 } 865 866 buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count, 867 GFP_KERNEL); 868 if (!buffer) 869 return -ENOMEM; 870 871 dst = (u8 __iomem *) (info->screen_base + p); 872 873 if (info->fbops->fb_sync) 874 info->fbops->fb_sync(info); 875 876 while (count) { 877 c = (count > PAGE_SIZE) ? PAGE_SIZE : count; 878 src = buffer; 879 880 if (copy_from_user(src, buf, c)) { 881 err = -EFAULT; 882 break; 883 } 884 885 fb_memcpy_tofb(dst, src, c); 886 dst += c; 887 src += c; 888 *ppos += c; 889 buf += c; 890 cnt += c; 891 count -= c; 892 } 893 894 kfree(buffer); 895 896 return (cnt) ? cnt : err; 897 } 898 899 int 900 fb_pan_display(struct fb_info *info, struct fb_var_screeninfo *var) 901 { 902 struct fb_fix_screeninfo *fix = &info->fix; 903 unsigned int yres = info->var.yres; 904 int err = 0; 905 906 if (var->yoffset > 0) { 907 if (var->vmode & FB_VMODE_YWRAP) { 908 if (!fix->ywrapstep || (var->yoffset % fix->ywrapstep)) 909 err = -EINVAL; 910 else 911 yres = 0; 912 } else if (!fix->ypanstep || (var->yoffset % fix->ypanstep)) 913 err = -EINVAL; 914 } 915 916 if (var->xoffset > 0 && (!fix->xpanstep || 917 (var->xoffset % fix->xpanstep))) 918 err = -EINVAL; 919 920 if (err || !info->fbops->fb_pan_display || 921 var->yoffset > info->var.yres_virtual - yres || 922 var->xoffset > info->var.xres_virtual - info->var.xres) 923 return -EINVAL; 924 925 if ((err = info->fbops->fb_pan_display(var, info))) 926 return err; 927 info->var.xoffset = var->xoffset; 928 info->var.yoffset = var->yoffset; 929 if (var->vmode & FB_VMODE_YWRAP) 930 info->var.vmode |= FB_VMODE_YWRAP; 931 else 932 info->var.vmode &= ~FB_VMODE_YWRAP; 933 return 0; 934 } 935 EXPORT_SYMBOL(fb_pan_display); 936 937 static int fb_check_caps(struct fb_info *info, struct fb_var_screeninfo *var, 938 u32 activate) 939 { 940 struct fb_blit_caps caps, fbcaps; 941 int err = 0; 942 943 memset(&caps, 0, sizeof(caps)); 944 memset(&fbcaps, 0, sizeof(fbcaps)); 945 caps.flags = (activate & FB_ACTIVATE_ALL) ? 1 : 0; 946 fbcon_get_requirement(info, &caps); 947 info->fbops->fb_get_caps(info, &fbcaps, var); 948 949 if (((fbcaps.x ^ caps.x) & caps.x) || 950 ((fbcaps.y ^ caps.y) & caps.y) || 951 (fbcaps.len < caps.len)) 952 err = -EINVAL; 953 954 return err; 955 } 956 957 int 958 fb_set_var(struct fb_info *info, struct fb_var_screeninfo *var) 959 { 960 int ret = 0; 961 u32 activate; 962 struct fb_var_screeninfo old_var; 963 struct fb_videomode mode; 964 struct fb_event event; 965 u32 unused; 966 967 if (var->activate & FB_ACTIVATE_INV_MODE) { 968 struct fb_videomode mode1, mode2; 969 970 fb_var_to_videomode(&mode1, var); 971 fb_var_to_videomode(&mode2, &info->var); 972 /* make sure we don't delete the videomode of current var */ 973 ret = fb_mode_is_equal(&mode1, &mode2); 974 if (!ret) { 975 ret = fbcon_mode_deleted(info, &mode1); 976 if (!ret) 977 fb_delete_videomode(&mode1, &info->modelist); 978 } 979 980 return ret ? -EINVAL : 0; 981 } 982 983 if (!(var->activate & FB_ACTIVATE_FORCE) && 984 !memcmp(&info->var, var, sizeof(struct fb_var_screeninfo))) 985 return 0; 986 987 activate = var->activate; 988 989 /* When using FOURCC mode, make sure the red, green, blue and 990 * transp fields are set to 0. 991 */ 992 if ((info->fix.capabilities & FB_CAP_FOURCC) && 993 var->grayscale > 1) { 994 if (var->red.offset || var->green.offset || 995 var->blue.offset || var->transp.offset || 996 var->red.length || var->green.length || 997 var->blue.length || var->transp.length || 998 var->red.msb_right || var->green.msb_right || 999 var->blue.msb_right || var->transp.msb_right) 1000 return -EINVAL; 1001 } 1002 1003 if (!info->fbops->fb_check_var) { 1004 *var = info->var; 1005 return 0; 1006 } 1007 1008 /* bitfill_aligned() assumes that it's at least 8x8 */ 1009 if (var->xres < 8 || var->yres < 8) 1010 return -EINVAL; 1011 1012 /* Too huge resolution causes multiplication overflow. */ 1013 if (check_mul_overflow(var->xres, var->yres, &unused) || 1014 check_mul_overflow(var->xres_virtual, var->yres_virtual, &unused)) 1015 return -EINVAL; 1016 1017 ret = info->fbops->fb_check_var(var, info); 1018 1019 if (ret) 1020 return ret; 1021 1022 /* verify that virtual resolution >= physical resolution */ 1023 if (var->xres_virtual < var->xres || 1024 var->yres_virtual < var->yres) { 1025 pr_warn("WARNING: fbcon: Driver '%s' missed to adjust virtual screen size (%ux%u vs. %ux%u)\n", 1026 info->fix.id, 1027 var->xres_virtual, var->yres_virtual, 1028 var->xres, var->yres); 1029 return -EINVAL; 1030 } 1031 1032 if ((var->activate & FB_ACTIVATE_MASK) != FB_ACTIVATE_NOW) 1033 return 0; 1034 1035 if (info->fbops->fb_get_caps) { 1036 ret = fb_check_caps(info, var, activate); 1037 1038 if (ret) 1039 return ret; 1040 } 1041 1042 old_var = info->var; 1043 info->var = *var; 1044 1045 if (info->fbops->fb_set_par) { 1046 ret = info->fbops->fb_set_par(info); 1047 1048 if (ret) { 1049 info->var = old_var; 1050 printk(KERN_WARNING "detected " 1051 "fb_set_par error, " 1052 "error code: %d\n", ret); 1053 return ret; 1054 } 1055 } 1056 1057 fb_pan_display(info, &info->var); 1058 fb_set_cmap(&info->cmap, info); 1059 fb_var_to_videomode(&mode, &info->var); 1060 1061 if (info->modelist.prev && info->modelist.next && 1062 !list_empty(&info->modelist)) 1063 ret = fb_add_videomode(&mode, &info->modelist); 1064 1065 if (ret) 1066 return ret; 1067 1068 event.info = info; 1069 event.data = &mode; 1070 fb_notifier_call_chain(FB_EVENT_MODE_CHANGE, &event); 1071 1072 return 0; 1073 } 1074 EXPORT_SYMBOL(fb_set_var); 1075 1076 int 1077 fb_blank(struct fb_info *info, int blank) 1078 { 1079 struct fb_event event; 1080 int ret = -EINVAL; 1081 1082 if (blank > FB_BLANK_POWERDOWN) 1083 blank = FB_BLANK_POWERDOWN; 1084 1085 event.info = info; 1086 event.data = ␣ 1087 1088 if (info->fbops->fb_blank) 1089 ret = info->fbops->fb_blank(blank, info); 1090 1091 if (!ret) 1092 fb_notifier_call_chain(FB_EVENT_BLANK, &event); 1093 1094 return ret; 1095 } 1096 EXPORT_SYMBOL(fb_blank); 1097 1098 static long do_fb_ioctl(struct fb_info *info, unsigned int cmd, 1099 unsigned long arg) 1100 { 1101 const struct fb_ops *fb; 1102 struct fb_var_screeninfo var; 1103 struct fb_fix_screeninfo fix; 1104 struct fb_cmap cmap_from; 1105 struct fb_cmap_user cmap; 1106 void __user *argp = (void __user *)arg; 1107 long ret = 0; 1108 1109 switch (cmd) { 1110 case FBIOGET_VSCREENINFO: 1111 lock_fb_info(info); 1112 var = info->var; 1113 unlock_fb_info(info); 1114 1115 ret = copy_to_user(argp, &var, sizeof(var)) ? -EFAULT : 0; 1116 break; 1117 case FBIOPUT_VSCREENINFO: 1118 if (copy_from_user(&var, argp, sizeof(var))) 1119 return -EFAULT; 1120 console_lock(); 1121 lock_fb_info(info); 1122 ret = fbcon_modechange_possible(info, &var); 1123 if (!ret) 1124 ret = fb_set_var(info, &var); 1125 if (!ret) 1126 fbcon_update_vcs(info, var.activate & FB_ACTIVATE_ALL); 1127 unlock_fb_info(info); 1128 console_unlock(); 1129 if (!ret && copy_to_user(argp, &var, sizeof(var))) 1130 ret = -EFAULT; 1131 break; 1132 case FBIOGET_FSCREENINFO: 1133 lock_fb_info(info); 1134 memcpy(&fix, &info->fix, sizeof(fix)); 1135 if (info->flags & FBINFO_HIDE_SMEM_START) 1136 fix.smem_start = 0; 1137 unlock_fb_info(info); 1138 1139 ret = copy_to_user(argp, &fix, sizeof(fix)) ? -EFAULT : 0; 1140 break; 1141 case FBIOPUTCMAP: 1142 if (copy_from_user(&cmap, argp, sizeof(cmap))) 1143 return -EFAULT; 1144 ret = fb_set_user_cmap(&cmap, info); 1145 break; 1146 case FBIOGETCMAP: 1147 if (copy_from_user(&cmap, argp, sizeof(cmap))) 1148 return -EFAULT; 1149 lock_fb_info(info); 1150 cmap_from = info->cmap; 1151 unlock_fb_info(info); 1152 ret = fb_cmap_to_user(&cmap_from, &cmap); 1153 break; 1154 case FBIOPAN_DISPLAY: 1155 if (copy_from_user(&var, argp, sizeof(var))) 1156 return -EFAULT; 1157 console_lock(); 1158 lock_fb_info(info); 1159 ret = fb_pan_display(info, &var); 1160 unlock_fb_info(info); 1161 console_unlock(); 1162 if (ret == 0 && copy_to_user(argp, &var, sizeof(var))) 1163 return -EFAULT; 1164 break; 1165 case FBIO_CURSOR: 1166 ret = -EINVAL; 1167 break; 1168 case FBIOGET_CON2FBMAP: 1169 ret = fbcon_get_con2fb_map_ioctl(argp); 1170 break; 1171 case FBIOPUT_CON2FBMAP: 1172 ret = fbcon_set_con2fb_map_ioctl(argp); 1173 break; 1174 case FBIOBLANK: 1175 if (arg > FB_BLANK_POWERDOWN) 1176 return -EINVAL; 1177 console_lock(); 1178 lock_fb_info(info); 1179 ret = fb_blank(info, arg); 1180 /* might again call into fb_blank */ 1181 fbcon_fb_blanked(info, arg); 1182 unlock_fb_info(info); 1183 console_unlock(); 1184 break; 1185 default: 1186 lock_fb_info(info); 1187 fb = info->fbops; 1188 if (fb->fb_ioctl) 1189 ret = fb->fb_ioctl(info, cmd, arg); 1190 else 1191 ret = -ENOTTY; 1192 unlock_fb_info(info); 1193 } 1194 return ret; 1195 } 1196 1197 static long fb_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 1198 { 1199 struct fb_info *info = file_fb_info(file); 1200 1201 if (!info) 1202 return -ENODEV; 1203 return do_fb_ioctl(info, cmd, arg); 1204 } 1205 1206 #ifdef CONFIG_COMPAT 1207 struct fb_fix_screeninfo32 { 1208 char id[16]; 1209 compat_caddr_t smem_start; 1210 u32 smem_len; 1211 u32 type; 1212 u32 type_aux; 1213 u32 visual; 1214 u16 xpanstep; 1215 u16 ypanstep; 1216 u16 ywrapstep; 1217 u32 line_length; 1218 compat_caddr_t mmio_start; 1219 u32 mmio_len; 1220 u32 accel; 1221 u16 reserved[3]; 1222 }; 1223 1224 struct fb_cmap32 { 1225 u32 start; 1226 u32 len; 1227 compat_caddr_t red; 1228 compat_caddr_t green; 1229 compat_caddr_t blue; 1230 compat_caddr_t transp; 1231 }; 1232 1233 static int fb_getput_cmap(struct fb_info *info, unsigned int cmd, 1234 unsigned long arg) 1235 { 1236 struct fb_cmap32 cmap32; 1237 struct fb_cmap cmap_from; 1238 struct fb_cmap_user cmap; 1239 1240 if (copy_from_user(&cmap32, compat_ptr(arg), sizeof(cmap32))) 1241 return -EFAULT; 1242 1243 cmap = (struct fb_cmap_user) { 1244 .start = cmap32.start, 1245 .len = cmap32.len, 1246 .red = compat_ptr(cmap32.red), 1247 .green = compat_ptr(cmap32.green), 1248 .blue = compat_ptr(cmap32.blue), 1249 .transp = compat_ptr(cmap32.transp), 1250 }; 1251 1252 if (cmd == FBIOPUTCMAP) 1253 return fb_set_user_cmap(&cmap, info); 1254 1255 lock_fb_info(info); 1256 cmap_from = info->cmap; 1257 unlock_fb_info(info); 1258 1259 return fb_cmap_to_user(&cmap_from, &cmap); 1260 } 1261 1262 static int do_fscreeninfo_to_user(struct fb_fix_screeninfo *fix, 1263 struct fb_fix_screeninfo32 __user *fix32) 1264 { 1265 __u32 data; 1266 int err; 1267 1268 err = copy_to_user(&fix32->id, &fix->id, sizeof(fix32->id)); 1269 1270 data = (__u32) (unsigned long) fix->smem_start; 1271 err |= put_user(data, &fix32->smem_start); 1272 1273 err |= put_user(fix->smem_len, &fix32->smem_len); 1274 err |= put_user(fix->type, &fix32->type); 1275 err |= put_user(fix->type_aux, &fix32->type_aux); 1276 err |= put_user(fix->visual, &fix32->visual); 1277 err |= put_user(fix->xpanstep, &fix32->xpanstep); 1278 err |= put_user(fix->ypanstep, &fix32->ypanstep); 1279 err |= put_user(fix->ywrapstep, &fix32->ywrapstep); 1280 err |= put_user(fix->line_length, &fix32->line_length); 1281 1282 data = (__u32) (unsigned long) fix->mmio_start; 1283 err |= put_user(data, &fix32->mmio_start); 1284 1285 err |= put_user(fix->mmio_len, &fix32->mmio_len); 1286 err |= put_user(fix->accel, &fix32->accel); 1287 err |= copy_to_user(fix32->reserved, fix->reserved, 1288 sizeof(fix->reserved)); 1289 1290 if (err) 1291 return -EFAULT; 1292 return 0; 1293 } 1294 1295 static int fb_get_fscreeninfo(struct fb_info *info, unsigned int cmd, 1296 unsigned long arg) 1297 { 1298 struct fb_fix_screeninfo fix; 1299 1300 lock_fb_info(info); 1301 fix = info->fix; 1302 if (info->flags & FBINFO_HIDE_SMEM_START) 1303 fix.smem_start = 0; 1304 unlock_fb_info(info); 1305 return do_fscreeninfo_to_user(&fix, compat_ptr(arg)); 1306 } 1307 1308 static long fb_compat_ioctl(struct file *file, unsigned int cmd, 1309 unsigned long arg) 1310 { 1311 struct fb_info *info = file_fb_info(file); 1312 const struct fb_ops *fb; 1313 long ret = -ENOIOCTLCMD; 1314 1315 if (!info) 1316 return -ENODEV; 1317 fb = info->fbops; 1318 switch(cmd) { 1319 case FBIOGET_VSCREENINFO: 1320 case FBIOPUT_VSCREENINFO: 1321 case FBIOPAN_DISPLAY: 1322 case FBIOGET_CON2FBMAP: 1323 case FBIOPUT_CON2FBMAP: 1324 arg = (unsigned long) compat_ptr(arg); 1325 fallthrough; 1326 case FBIOBLANK: 1327 ret = do_fb_ioctl(info, cmd, arg); 1328 break; 1329 1330 case FBIOGET_FSCREENINFO: 1331 ret = fb_get_fscreeninfo(info, cmd, arg); 1332 break; 1333 1334 case FBIOGETCMAP: 1335 case FBIOPUTCMAP: 1336 ret = fb_getput_cmap(info, cmd, arg); 1337 break; 1338 1339 default: 1340 if (fb->fb_compat_ioctl) 1341 ret = fb->fb_compat_ioctl(info, cmd, arg); 1342 break; 1343 } 1344 return ret; 1345 } 1346 #endif 1347 1348 static int 1349 fb_mmap(struct file *file, struct vm_area_struct * vma) 1350 { 1351 struct fb_info *info = file_fb_info(file); 1352 unsigned long mmio_pgoff; 1353 unsigned long start; 1354 u32 len; 1355 1356 if (!info) 1357 return -ENODEV; 1358 mutex_lock(&info->mm_lock); 1359 1360 if (info->fbops->fb_mmap) { 1361 int res; 1362 1363 /* 1364 * The framebuffer needs to be accessed decrypted, be sure 1365 * SME protection is removed ahead of the call 1366 */ 1367 vma->vm_page_prot = pgprot_decrypted(vma->vm_page_prot); 1368 res = info->fbops->fb_mmap(info, vma); 1369 mutex_unlock(&info->mm_lock); 1370 return res; 1371 #if IS_ENABLED(CONFIG_FB_DEFERRED_IO) 1372 } else if (info->fbdefio) { 1373 /* 1374 * FB deferred I/O wants you to handle mmap in your drivers. At a 1375 * minimum, point struct fb_ops.fb_mmap to fb_deferred_io_mmap(). 1376 */ 1377 dev_warn_once(info->dev, "fbdev mmap not set up for deferred I/O.\n"); 1378 mutex_unlock(&info->mm_lock); 1379 return -ENODEV; 1380 #endif 1381 } 1382 1383 /* 1384 * Ugh. This can be either the frame buffer mapping, or 1385 * if pgoff points past it, the mmio mapping. 1386 */ 1387 start = info->fix.smem_start; 1388 len = info->fix.smem_len; 1389 mmio_pgoff = PAGE_ALIGN((start & ~PAGE_MASK) + len) >> PAGE_SHIFT; 1390 if (vma->vm_pgoff >= mmio_pgoff) { 1391 if (info->var.accel_flags) { 1392 mutex_unlock(&info->mm_lock); 1393 return -EINVAL; 1394 } 1395 1396 vma->vm_pgoff -= mmio_pgoff; 1397 start = info->fix.mmio_start; 1398 len = info->fix.mmio_len; 1399 } 1400 mutex_unlock(&info->mm_lock); 1401 1402 vma->vm_page_prot = vm_get_page_prot(vma->vm_flags); 1403 fb_pgprotect(file, vma, start); 1404 1405 return vm_iomap_memory(vma, start, len); 1406 } 1407 1408 static int 1409 fb_open(struct inode *inode, struct file *file) 1410 __acquires(&info->lock) 1411 __releases(&info->lock) 1412 { 1413 int fbidx = iminor(inode); 1414 struct fb_info *info; 1415 int res = 0; 1416 1417 info = get_fb_info(fbidx); 1418 if (!info) { 1419 request_module("fb%d", fbidx); 1420 info = get_fb_info(fbidx); 1421 if (!info) 1422 return -ENODEV; 1423 } 1424 if (IS_ERR(info)) 1425 return PTR_ERR(info); 1426 1427 lock_fb_info(info); 1428 if (!try_module_get(info->fbops->owner)) { 1429 res = -ENODEV; 1430 goto out; 1431 } 1432 file->private_data = info; 1433 if (info->fbops->fb_open) { 1434 res = info->fbops->fb_open(info,1); 1435 if (res) 1436 module_put(info->fbops->owner); 1437 } 1438 #ifdef CONFIG_FB_DEFERRED_IO 1439 if (info->fbdefio) 1440 fb_deferred_io_open(info, inode, file); 1441 #endif 1442 out: 1443 unlock_fb_info(info); 1444 if (res) 1445 put_fb_info(info); 1446 return res; 1447 } 1448 1449 static int 1450 fb_release(struct inode *inode, struct file *file) 1451 __acquires(&info->lock) 1452 __releases(&info->lock) 1453 { 1454 struct fb_info * const info = file->private_data; 1455 1456 lock_fb_info(info); 1457 #if IS_ENABLED(CONFIG_FB_DEFERRED_IO) 1458 if (info->fbdefio) 1459 fb_deferred_io_release(info); 1460 #endif 1461 if (info->fbops->fb_release) 1462 info->fbops->fb_release(info,1); 1463 module_put(info->fbops->owner); 1464 unlock_fb_info(info); 1465 put_fb_info(info); 1466 return 0; 1467 } 1468 1469 #if defined(CONFIG_FB_PROVIDE_GET_FB_UNMAPPED_AREA) && !defined(CONFIG_MMU) 1470 unsigned long get_fb_unmapped_area(struct file *filp, 1471 unsigned long addr, unsigned long len, 1472 unsigned long pgoff, unsigned long flags) 1473 { 1474 struct fb_info * const info = filp->private_data; 1475 unsigned long fb_size = PAGE_ALIGN(info->fix.smem_len); 1476 1477 if (pgoff > fb_size || len > fb_size - pgoff) 1478 return -EINVAL; 1479 1480 return (unsigned long)info->screen_base + pgoff; 1481 } 1482 #endif 1483 1484 static const struct file_operations fb_fops = { 1485 .owner = THIS_MODULE, 1486 .read = fb_read, 1487 .write = fb_write, 1488 .unlocked_ioctl = fb_ioctl, 1489 #ifdef CONFIG_COMPAT 1490 .compat_ioctl = fb_compat_ioctl, 1491 #endif 1492 .mmap = fb_mmap, 1493 .open = fb_open, 1494 .release = fb_release, 1495 #if defined(HAVE_ARCH_FB_UNMAPPED_AREA) || \ 1496 (defined(CONFIG_FB_PROVIDE_GET_FB_UNMAPPED_AREA) && \ 1497 !defined(CONFIG_MMU)) 1498 .get_unmapped_area = get_fb_unmapped_area, 1499 #endif 1500 #ifdef CONFIG_FB_DEFERRED_IO 1501 .fsync = fb_deferred_io_fsync, 1502 #endif 1503 .llseek = default_llseek, 1504 }; 1505 1506 struct class *fb_class; 1507 EXPORT_SYMBOL(fb_class); 1508 1509 static int fb_check_foreignness(struct fb_info *fi) 1510 { 1511 const bool foreign_endian = fi->flags & FBINFO_FOREIGN_ENDIAN; 1512 1513 fi->flags &= ~FBINFO_FOREIGN_ENDIAN; 1514 1515 #ifdef __BIG_ENDIAN 1516 fi->flags |= foreign_endian ? 0 : FBINFO_BE_MATH; 1517 #else 1518 fi->flags |= foreign_endian ? FBINFO_BE_MATH : 0; 1519 #endif /* __BIG_ENDIAN */ 1520 1521 if (fi->flags & FBINFO_BE_MATH && !fb_be_math(fi)) { 1522 pr_err("%s: enable CONFIG_FB_BIG_ENDIAN to " 1523 "support this framebuffer\n", fi->fix.id); 1524 return -ENOSYS; 1525 } else if (!(fi->flags & FBINFO_BE_MATH) && fb_be_math(fi)) { 1526 pr_err("%s: enable CONFIG_FB_LITTLE_ENDIAN to " 1527 "support this framebuffer\n", fi->fix.id); 1528 return -ENOSYS; 1529 } 1530 1531 return 0; 1532 } 1533 1534 static int do_register_framebuffer(struct fb_info *fb_info) 1535 { 1536 int i; 1537 struct fb_videomode mode; 1538 1539 if (fb_check_foreignness(fb_info)) 1540 return -ENOSYS; 1541 1542 if (num_registered_fb == FB_MAX) 1543 return -ENXIO; 1544 1545 num_registered_fb++; 1546 for (i = 0 ; i < FB_MAX; i++) 1547 if (!registered_fb[i]) 1548 break; 1549 fb_info->node = i; 1550 refcount_set(&fb_info->count, 1); 1551 mutex_init(&fb_info->lock); 1552 mutex_init(&fb_info->mm_lock); 1553 1554 fb_info->dev = device_create(fb_class, fb_info->device, 1555 MKDEV(FB_MAJOR, i), NULL, "fb%d", i); 1556 if (IS_ERR(fb_info->dev)) { 1557 /* Not fatal */ 1558 printk(KERN_WARNING "Unable to create device for framebuffer %d; errno = %ld\n", i, PTR_ERR(fb_info->dev)); 1559 fb_info->dev = NULL; 1560 } else 1561 fb_init_device(fb_info); 1562 1563 if (fb_info->pixmap.addr == NULL) { 1564 fb_info->pixmap.addr = kmalloc(FBPIXMAPSIZE, GFP_KERNEL); 1565 if (fb_info->pixmap.addr) { 1566 fb_info->pixmap.size = FBPIXMAPSIZE; 1567 fb_info->pixmap.buf_align = 1; 1568 fb_info->pixmap.scan_align = 1; 1569 fb_info->pixmap.access_align = 32; 1570 fb_info->pixmap.flags = FB_PIXMAP_DEFAULT; 1571 } 1572 } 1573 fb_info->pixmap.offset = 0; 1574 1575 if (!fb_info->pixmap.blit_x) 1576 fb_info->pixmap.blit_x = ~(u32)0; 1577 1578 if (!fb_info->pixmap.blit_y) 1579 fb_info->pixmap.blit_y = ~(u32)0; 1580 1581 if (!fb_info->modelist.prev || !fb_info->modelist.next) 1582 INIT_LIST_HEAD(&fb_info->modelist); 1583 1584 if (fb_info->skip_vt_switch) 1585 pm_vt_switch_required(fb_info->dev, false); 1586 else 1587 pm_vt_switch_required(fb_info->dev, true); 1588 1589 fb_var_to_videomode(&mode, &fb_info->var); 1590 fb_add_videomode(&mode, &fb_info->modelist); 1591 registered_fb[i] = fb_info; 1592 1593 #ifdef CONFIG_GUMSTIX_AM200EPD 1594 { 1595 struct fb_event event; 1596 event.info = fb_info; 1597 fb_notifier_call_chain(FB_EVENT_FB_REGISTERED, &event); 1598 } 1599 #endif 1600 1601 return fbcon_fb_registered(fb_info); 1602 } 1603 1604 static void unbind_console(struct fb_info *fb_info) 1605 { 1606 int i = fb_info->node; 1607 1608 if (WARN_ON(i < 0 || i >= FB_MAX || registered_fb[i] != fb_info)) 1609 return; 1610 1611 fbcon_fb_unbind(fb_info); 1612 } 1613 1614 static void unlink_framebuffer(struct fb_info *fb_info) 1615 { 1616 int i; 1617 1618 i = fb_info->node; 1619 if (WARN_ON(i < 0 || i >= FB_MAX || registered_fb[i] != fb_info)) 1620 return; 1621 1622 if (!fb_info->dev) 1623 return; 1624 1625 device_destroy(fb_class, MKDEV(FB_MAJOR, i)); 1626 1627 pm_vt_switch_unregister(fb_info->dev); 1628 1629 unbind_console(fb_info); 1630 1631 fb_info->dev = NULL; 1632 } 1633 1634 static void do_unregister_framebuffer(struct fb_info *fb_info) 1635 { 1636 unlink_framebuffer(fb_info); 1637 if (fb_info->pixmap.addr && 1638 (fb_info->pixmap.flags & FB_PIXMAP_DEFAULT)) { 1639 kfree(fb_info->pixmap.addr); 1640 fb_info->pixmap.addr = NULL; 1641 } 1642 1643 fb_destroy_modelist(&fb_info->modelist); 1644 registered_fb[fb_info->node] = NULL; 1645 num_registered_fb--; 1646 fb_cleanup_device(fb_info); 1647 #ifdef CONFIG_GUMSTIX_AM200EPD 1648 { 1649 struct fb_event event; 1650 event.info = fb_info; 1651 fb_notifier_call_chain(FB_EVENT_FB_UNREGISTERED, &event); 1652 } 1653 #endif 1654 fbcon_fb_unregistered(fb_info); 1655 1656 /* this may free fb info */ 1657 put_fb_info(fb_info); 1658 } 1659 1660 static int fb_aperture_acquire_for_platform_device(struct fb_info *fb_info) 1661 { 1662 struct apertures_struct *ap = fb_info->apertures; 1663 struct device *dev = fb_info->device; 1664 struct platform_device *pdev; 1665 unsigned int i; 1666 int ret; 1667 1668 if (!ap) 1669 return 0; 1670 1671 if (!dev_is_platform(dev)) 1672 return 0; 1673 1674 pdev = to_platform_device(dev); 1675 1676 for (ret = 0, i = 0; i < ap->count; ++i) { 1677 ret = devm_aperture_acquire_for_platform_device(pdev, ap->ranges[i].base, 1678 ap->ranges[i].size); 1679 if (ret) 1680 break; 1681 } 1682 1683 return ret; 1684 } 1685 1686 /** 1687 * register_framebuffer - registers a frame buffer device 1688 * @fb_info: frame buffer info structure 1689 * 1690 * Registers a frame buffer device @fb_info. 1691 * 1692 * Returns negative errno on error, or zero for success. 1693 * 1694 */ 1695 int 1696 register_framebuffer(struct fb_info *fb_info) 1697 { 1698 int ret; 1699 1700 if (fb_info->flags & FBINFO_MISC_FIRMWARE) { 1701 ret = fb_aperture_acquire_for_platform_device(fb_info); 1702 if (ret) 1703 return ret; 1704 } 1705 1706 mutex_lock(®istration_lock); 1707 ret = do_register_framebuffer(fb_info); 1708 mutex_unlock(®istration_lock); 1709 1710 return ret; 1711 } 1712 EXPORT_SYMBOL(register_framebuffer); 1713 1714 /** 1715 * unregister_framebuffer - releases a frame buffer device 1716 * @fb_info: frame buffer info structure 1717 * 1718 * Unregisters a frame buffer device @fb_info. 1719 * 1720 * Returns negative errno on error, or zero for success. 1721 * 1722 * This function will also notify the framebuffer console 1723 * to release the driver. 1724 * 1725 * This is meant to be called within a driver's module_exit() 1726 * function. If this is called outside module_exit(), ensure 1727 * that the driver implements fb_open() and fb_release() to 1728 * check that no processes are using the device. 1729 */ 1730 void 1731 unregister_framebuffer(struct fb_info *fb_info) 1732 { 1733 mutex_lock(®istration_lock); 1734 do_unregister_framebuffer(fb_info); 1735 mutex_unlock(®istration_lock); 1736 } 1737 EXPORT_SYMBOL(unregister_framebuffer); 1738 1739 /** 1740 * fb_set_suspend - low level driver signals suspend 1741 * @info: framebuffer affected 1742 * @state: 0 = resuming, !=0 = suspending 1743 * 1744 * This is meant to be used by low level drivers to 1745 * signal suspend/resume to the core & clients. 1746 * It must be called with the console semaphore held 1747 */ 1748 void fb_set_suspend(struct fb_info *info, int state) 1749 { 1750 WARN_CONSOLE_UNLOCKED(); 1751 1752 if (state) { 1753 fbcon_suspended(info); 1754 info->state = FBINFO_STATE_SUSPENDED; 1755 } else { 1756 info->state = FBINFO_STATE_RUNNING; 1757 fbcon_resumed(info); 1758 } 1759 } 1760 EXPORT_SYMBOL(fb_set_suspend); 1761 1762 /** 1763 * fbmem_init - init frame buffer subsystem 1764 * 1765 * Initialize the frame buffer subsystem. 1766 * 1767 * NOTE: This function is _only_ to be called by drivers/char/mem.c. 1768 * 1769 */ 1770 1771 static int __init 1772 fbmem_init(void) 1773 { 1774 int ret; 1775 1776 if (!proc_create_seq("fb", 0, NULL, &proc_fb_seq_ops)) 1777 return -ENOMEM; 1778 1779 ret = register_chrdev(FB_MAJOR, "fb", &fb_fops); 1780 if (ret) { 1781 printk("unable to get major %d for fb devs\n", FB_MAJOR); 1782 goto err_chrdev; 1783 } 1784 1785 fb_class = class_create(THIS_MODULE, "graphics"); 1786 if (IS_ERR(fb_class)) { 1787 ret = PTR_ERR(fb_class); 1788 pr_warn("Unable to create fb class; errno = %d\n", ret); 1789 fb_class = NULL; 1790 goto err_class; 1791 } 1792 1793 fb_console_init(); 1794 1795 return 0; 1796 1797 err_class: 1798 unregister_chrdev(FB_MAJOR, "fb"); 1799 err_chrdev: 1800 remove_proc_entry("fb", NULL); 1801 return ret; 1802 } 1803 1804 #ifdef MODULE 1805 module_init(fbmem_init); 1806 static void __exit 1807 fbmem_exit(void) 1808 { 1809 fb_console_exit(); 1810 1811 remove_proc_entry("fb", NULL); 1812 class_destroy(fb_class); 1813 unregister_chrdev(FB_MAJOR, "fb"); 1814 } 1815 1816 module_exit(fbmem_exit); 1817 MODULE_LICENSE("GPL"); 1818 MODULE_DESCRIPTION("Framebuffer base"); 1819 #else 1820 subsys_initcall(fbmem_init); 1821 #endif 1822 1823 int fb_new_modelist(struct fb_info *info) 1824 { 1825 struct fb_var_screeninfo var = info->var; 1826 struct list_head *pos, *n; 1827 struct fb_modelist *modelist; 1828 struct fb_videomode *m, mode; 1829 int err; 1830 1831 list_for_each_safe(pos, n, &info->modelist) { 1832 modelist = list_entry(pos, struct fb_modelist, list); 1833 m = &modelist->mode; 1834 fb_videomode_to_var(&var, m); 1835 var.activate = FB_ACTIVATE_TEST; 1836 err = fb_set_var(info, &var); 1837 fb_var_to_videomode(&mode, &var); 1838 if (err || !fb_mode_is_equal(m, &mode)) { 1839 list_del(pos); 1840 kfree(pos); 1841 } 1842 } 1843 1844 if (list_empty(&info->modelist)) 1845 return 1; 1846 1847 fbcon_new_modelist(info); 1848 1849 return 0; 1850 } 1851 1852 #if defined(CONFIG_VIDEO_NOMODESET) 1853 bool fb_modesetting_disabled(const char *drvname) 1854 { 1855 bool fwonly = video_firmware_drivers_only(); 1856 1857 if (fwonly) 1858 pr_warn("Driver %s not loading because of nomodeset parameter\n", 1859 drvname); 1860 1861 return fwonly; 1862 } 1863 EXPORT_SYMBOL(fb_modesetting_disabled); 1864 #endif 1865 1866 MODULE_LICENSE("GPL"); 1867