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/seq_file.h> 29 #include <linux/console.h> 30 #include <linux/kmod.h> 31 #include <linux/err.h> 32 #include <linux/device.h> 33 #include <linux/efi.h> 34 #include <linux/fb.h> 35 #include <linux/fbcon.h> 36 #include <linux/mem_encrypt.h> 37 38 #include <asm/fb.h> 39 40 41 /* 42 * Frame buffer device initialization and setup routines 43 */ 44 45 #define FBPIXMAPSIZE (1024 * 8) 46 47 static DEFINE_MUTEX(registration_lock); 48 49 struct fb_info *registered_fb[FB_MAX] __read_mostly; 50 EXPORT_SYMBOL(registered_fb); 51 52 int num_registered_fb __read_mostly; 53 EXPORT_SYMBOL(num_registered_fb); 54 55 static struct fb_info *get_fb_info(unsigned int idx) 56 { 57 struct fb_info *fb_info; 58 59 if (idx >= FB_MAX) 60 return ERR_PTR(-ENODEV); 61 62 mutex_lock(®istration_lock); 63 fb_info = registered_fb[idx]; 64 if (fb_info) 65 atomic_inc(&fb_info->count); 66 mutex_unlock(®istration_lock); 67 68 return fb_info; 69 } 70 71 static void put_fb_info(struct fb_info *fb_info) 72 { 73 if (!atomic_dec_and_test(&fb_info->count)) 74 return; 75 if (fb_info->fbops->fb_destroy) 76 fb_info->fbops->fb_destroy(fb_info); 77 } 78 79 int lock_fb_info(struct fb_info *info) 80 { 81 mutex_lock(&info->lock); 82 if (!info->fbops) { 83 mutex_unlock(&info->lock); 84 return 0; 85 } 86 return 1; 87 } 88 EXPORT_SYMBOL(lock_fb_info); 89 90 /* 91 * Helpers 92 */ 93 94 int fb_get_color_depth(struct fb_var_screeninfo *var, 95 struct fb_fix_screeninfo *fix) 96 { 97 int depth = 0; 98 99 if (fix->visual == FB_VISUAL_MONO01 || 100 fix->visual == FB_VISUAL_MONO10) 101 depth = 1; 102 else { 103 if (var->green.length == var->blue.length && 104 var->green.length == var->red.length && 105 var->green.offset == var->blue.offset && 106 var->green.offset == var->red.offset) 107 depth = var->green.length; 108 else 109 depth = var->green.length + var->red.length + 110 var->blue.length; 111 } 112 113 return depth; 114 } 115 EXPORT_SYMBOL(fb_get_color_depth); 116 117 /* 118 * Data padding functions. 119 */ 120 void fb_pad_aligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 s_pitch, u32 height) 121 { 122 __fb_pad_aligned_buffer(dst, d_pitch, src, s_pitch, height); 123 } 124 EXPORT_SYMBOL(fb_pad_aligned_buffer); 125 126 void fb_pad_unaligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 idx, u32 height, 127 u32 shift_high, u32 shift_low, u32 mod) 128 { 129 u8 mask = (u8) (0xfff << shift_high), tmp; 130 int i, j; 131 132 for (i = height; i--; ) { 133 for (j = 0; j < idx; j++) { 134 tmp = dst[j]; 135 tmp &= mask; 136 tmp |= *src >> shift_low; 137 dst[j] = tmp; 138 tmp = *src << shift_high; 139 dst[j+1] = tmp; 140 src++; 141 } 142 tmp = dst[idx]; 143 tmp &= mask; 144 tmp |= *src >> shift_low; 145 dst[idx] = tmp; 146 if (shift_high < mod) { 147 tmp = *src << shift_high; 148 dst[idx+1] = tmp; 149 } 150 src++; 151 dst += d_pitch; 152 } 153 } 154 EXPORT_SYMBOL(fb_pad_unaligned_buffer); 155 156 /* 157 * we need to lock this section since fb_cursor 158 * may use fb_imageblit() 159 */ 160 char* fb_get_buffer_offset(struct fb_info *info, struct fb_pixmap *buf, u32 size) 161 { 162 u32 align = buf->buf_align - 1, offset; 163 char *addr = buf->addr; 164 165 /* If IO mapped, we need to sync before access, no sharing of 166 * the pixmap is done 167 */ 168 if (buf->flags & FB_PIXMAP_IO) { 169 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC)) 170 info->fbops->fb_sync(info); 171 return addr; 172 } 173 174 /* See if we fit in the remaining pixmap space */ 175 offset = buf->offset + align; 176 offset &= ~align; 177 if (offset + size > buf->size) { 178 /* We do not fit. In order to be able to re-use the buffer, 179 * we must ensure no asynchronous DMA'ing or whatever operation 180 * is in progress, we sync for that. 181 */ 182 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC)) 183 info->fbops->fb_sync(info); 184 offset = 0; 185 } 186 buf->offset = offset + size; 187 addr += offset; 188 189 return addr; 190 } 191 EXPORT_SYMBOL(fb_get_buffer_offset); 192 193 #ifdef CONFIG_LOGO 194 195 static inline unsigned safe_shift(unsigned d, int n) 196 { 197 return n < 0 ? d >> -n : d << n; 198 } 199 200 static void fb_set_logocmap(struct fb_info *info, 201 const struct linux_logo *logo) 202 { 203 struct fb_cmap palette_cmap; 204 u16 palette_green[16]; 205 u16 palette_blue[16]; 206 u16 palette_red[16]; 207 int i, j, n; 208 const unsigned char *clut = logo->clut; 209 210 palette_cmap.start = 0; 211 palette_cmap.len = 16; 212 palette_cmap.red = palette_red; 213 palette_cmap.green = palette_green; 214 palette_cmap.blue = palette_blue; 215 palette_cmap.transp = NULL; 216 217 for (i = 0; i < logo->clutsize; i += n) { 218 n = logo->clutsize - i; 219 /* palette_cmap provides space for only 16 colors at once */ 220 if (n > 16) 221 n = 16; 222 palette_cmap.start = 32 + i; 223 palette_cmap.len = n; 224 for (j = 0; j < n; ++j) { 225 palette_cmap.red[j] = clut[0] << 8 | clut[0]; 226 palette_cmap.green[j] = clut[1] << 8 | clut[1]; 227 palette_cmap.blue[j] = clut[2] << 8 | clut[2]; 228 clut += 3; 229 } 230 fb_set_cmap(&palette_cmap, info); 231 } 232 } 233 234 static void fb_set_logo_truepalette(struct fb_info *info, 235 const struct linux_logo *logo, 236 u32 *palette) 237 { 238 static const unsigned char mask[] = { 0,0x80,0xc0,0xe0,0xf0,0xf8,0xfc,0xfe,0xff }; 239 unsigned char redmask, greenmask, bluemask; 240 int redshift, greenshift, blueshift; 241 int i; 242 const unsigned char *clut = logo->clut; 243 244 /* 245 * We have to create a temporary palette since console palette is only 246 * 16 colors long. 247 */ 248 /* Bug: Doesn't obey msb_right ... (who needs that?) */ 249 redmask = mask[info->var.red.length < 8 ? info->var.red.length : 8]; 250 greenmask = mask[info->var.green.length < 8 ? info->var.green.length : 8]; 251 bluemask = mask[info->var.blue.length < 8 ? info->var.blue.length : 8]; 252 redshift = info->var.red.offset - (8 - info->var.red.length); 253 greenshift = info->var.green.offset - (8 - info->var.green.length); 254 blueshift = info->var.blue.offset - (8 - info->var.blue.length); 255 256 for ( i = 0; i < logo->clutsize; i++) { 257 palette[i+32] = (safe_shift((clut[0] & redmask), redshift) | 258 safe_shift((clut[1] & greenmask), greenshift) | 259 safe_shift((clut[2] & bluemask), blueshift)); 260 clut += 3; 261 } 262 } 263 264 static void fb_set_logo_directpalette(struct fb_info *info, 265 const struct linux_logo *logo, 266 u32 *palette) 267 { 268 int redshift, greenshift, blueshift; 269 int i; 270 271 redshift = info->var.red.offset; 272 greenshift = info->var.green.offset; 273 blueshift = info->var.blue.offset; 274 275 for (i = 32; i < 32 + logo->clutsize; i++) 276 palette[i] = i << redshift | i << greenshift | i << blueshift; 277 } 278 279 static void fb_set_logo(struct fb_info *info, 280 const struct linux_logo *logo, u8 *dst, 281 int depth) 282 { 283 int i, j, k; 284 const u8 *src = logo->data; 285 u8 xor = (info->fix.visual == FB_VISUAL_MONO01) ? 0xff : 0; 286 u8 fg = 1, d; 287 288 switch (fb_get_color_depth(&info->var, &info->fix)) { 289 case 1: 290 fg = 1; 291 break; 292 case 2: 293 fg = 3; 294 break; 295 default: 296 fg = 7; 297 break; 298 } 299 300 if (info->fix.visual == FB_VISUAL_MONO01 || 301 info->fix.visual == FB_VISUAL_MONO10) 302 fg = ~((u8) (0xfff << info->var.green.length)); 303 304 switch (depth) { 305 case 4: 306 for (i = 0; i < logo->height; i++) 307 for (j = 0; j < logo->width; src++) { 308 *dst++ = *src >> 4; 309 j++; 310 if (j < logo->width) { 311 *dst++ = *src & 0x0f; 312 j++; 313 } 314 } 315 break; 316 case 1: 317 for (i = 0; i < logo->height; i++) { 318 for (j = 0; j < logo->width; src++) { 319 d = *src ^ xor; 320 for (k = 7; k >= 0 && j < logo->width; k--) { 321 *dst++ = ((d >> k) & 1) ? fg : 0; 322 j++; 323 } 324 } 325 } 326 break; 327 } 328 } 329 330 /* 331 * Three (3) kinds of logo maps exist. linux_logo_clut224 (>16 colors), 332 * linux_logo_vga16 (16 colors) and linux_logo_mono (2 colors). Depending on 333 * the visual format and color depth of the framebuffer, the DAC, the 334 * pseudo_palette, and the logo data will be adjusted accordingly. 335 * 336 * Case 1 - linux_logo_clut224: 337 * Color exceeds the number of console colors (16), thus we set the hardware DAC 338 * using fb_set_cmap() appropriately. The "needs_cmapreset" flag will be set. 339 * 340 * For visuals that require color info from the pseudo_palette, we also construct 341 * one for temporary use. The "needs_directpalette" or "needs_truepalette" flags 342 * will be set. 343 * 344 * Case 2 - linux_logo_vga16: 345 * The number of colors just matches the console colors, thus there is no need 346 * to set the DAC or the pseudo_palette. However, the bitmap is packed, ie, 347 * each byte contains color information for two pixels (upper and lower nibble). 348 * To be consistent with fb_imageblit() usage, we therefore separate the two 349 * nibbles into separate bytes. The "depth" flag will be set to 4. 350 * 351 * Case 3 - linux_logo_mono: 352 * This is similar with Case 2. Each byte contains information for 8 pixels. 353 * We isolate each bit and expand each into a byte. The "depth" flag will 354 * be set to 1. 355 */ 356 static struct logo_data { 357 int depth; 358 int needs_directpalette; 359 int needs_truepalette; 360 int needs_cmapreset; 361 const struct linux_logo *logo; 362 } fb_logo __read_mostly; 363 364 static void fb_rotate_logo_ud(const u8 *in, u8 *out, u32 width, u32 height) 365 { 366 u32 size = width * height, i; 367 368 out += size - 1; 369 370 for (i = size; i--; ) 371 *out-- = *in++; 372 } 373 374 static void fb_rotate_logo_cw(const u8 *in, u8 *out, u32 width, u32 height) 375 { 376 int i, j, h = height - 1; 377 378 for (i = 0; i < height; i++) 379 for (j = 0; j < width; j++) 380 out[height * j + h - i] = *in++; 381 } 382 383 static void fb_rotate_logo_ccw(const u8 *in, u8 *out, u32 width, u32 height) 384 { 385 int i, j, w = width - 1; 386 387 for (i = 0; i < height; i++) 388 for (j = 0; j < width; j++) 389 out[height * (w - j) + i] = *in++; 390 } 391 392 static void fb_rotate_logo(struct fb_info *info, u8 *dst, 393 struct fb_image *image, int rotate) 394 { 395 u32 tmp; 396 397 if (rotate == FB_ROTATE_UD) { 398 fb_rotate_logo_ud(image->data, dst, image->width, 399 image->height); 400 image->dx = info->var.xres - image->width - image->dx; 401 image->dy = info->var.yres - image->height - image->dy; 402 } else if (rotate == FB_ROTATE_CW) { 403 fb_rotate_logo_cw(image->data, dst, image->width, 404 image->height); 405 tmp = image->width; 406 image->width = image->height; 407 image->height = tmp; 408 tmp = image->dy; 409 image->dy = image->dx; 410 image->dx = info->var.xres - image->width - tmp; 411 } else if (rotate == FB_ROTATE_CCW) { 412 fb_rotate_logo_ccw(image->data, dst, image->width, 413 image->height); 414 tmp = image->width; 415 image->width = image->height; 416 image->height = tmp; 417 tmp = image->dx; 418 image->dx = image->dy; 419 image->dy = info->var.yres - image->height - tmp; 420 } 421 422 image->data = dst; 423 } 424 425 static void fb_do_show_logo(struct fb_info *info, struct fb_image *image, 426 int rotate, unsigned int num) 427 { 428 unsigned int x; 429 430 if (rotate == FB_ROTATE_UR) { 431 for (x = 0; 432 x < num && image->dx + image->width <= info->var.xres; 433 x++) { 434 info->fbops->fb_imageblit(info, image); 435 image->dx += image->width + 8; 436 } 437 } else if (rotate == FB_ROTATE_UD) { 438 for (x = 0; x < num; x++) { 439 info->fbops->fb_imageblit(info, image); 440 image->dx -= image->width + 8; 441 } 442 } else if (rotate == FB_ROTATE_CW) { 443 for (x = 0; 444 x < num && image->dy + image->height <= info->var.yres; 445 x++) { 446 info->fbops->fb_imageblit(info, image); 447 image->dy += image->height + 8; 448 } 449 } else if (rotate == FB_ROTATE_CCW) { 450 for (x = 0; x < num; 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(logo->width * logo->height, GFP_KERNEL); 493 if (logo_new == NULL) { 494 kfree(palette); 495 if (saved_pseudo_palette) 496 info->pseudo_palette = saved_pseudo_palette; 497 return 0; 498 } 499 image.data = logo_new; 500 fb_set_logo(info, logo, logo_new, fb_logo.depth); 501 } 502 503 image.dx = 0; 504 image.dy = y; 505 image.width = logo->width; 506 image.height = logo->height; 507 508 if (rotate) { 509 logo_rotate = kmalloc(logo->width * 510 logo->height, GFP_KERNEL); 511 if (logo_rotate) 512 fb_rotate_logo(info, logo_rotate, &image, rotate); 513 } 514 515 fb_do_show_logo(info, &image, rotate, n); 516 517 kfree(palette); 518 if (saved_pseudo_palette != NULL) 519 info->pseudo_palette = saved_pseudo_palette; 520 kfree(logo_new); 521 kfree(logo_rotate); 522 return logo->height; 523 } 524 525 526 #ifdef CONFIG_FB_LOGO_EXTRA 527 528 #define FB_LOGO_EX_NUM_MAX 10 529 static struct logo_data_extra { 530 const struct linux_logo *logo; 531 unsigned int n; 532 } fb_logo_ex[FB_LOGO_EX_NUM_MAX]; 533 static unsigned int fb_logo_ex_num; 534 535 void fb_append_extra_logo(const struct linux_logo *logo, unsigned int n) 536 { 537 if (!n || fb_logo_ex_num == FB_LOGO_EX_NUM_MAX) 538 return; 539 540 fb_logo_ex[fb_logo_ex_num].logo = logo; 541 fb_logo_ex[fb_logo_ex_num].n = n; 542 fb_logo_ex_num++; 543 } 544 545 static int fb_prepare_extra_logos(struct fb_info *info, unsigned int height, 546 unsigned int yres) 547 { 548 unsigned int i; 549 550 /* FIXME: logo_ex supports only truecolor fb. */ 551 if (info->fix.visual != FB_VISUAL_TRUECOLOR) 552 fb_logo_ex_num = 0; 553 554 for (i = 0; i < fb_logo_ex_num; i++) { 555 if (fb_logo_ex[i].logo->type != fb_logo.logo->type) { 556 fb_logo_ex[i].logo = NULL; 557 continue; 558 } 559 height += fb_logo_ex[i].logo->height; 560 if (height > yres) { 561 height -= fb_logo_ex[i].logo->height; 562 fb_logo_ex_num = i; 563 break; 564 } 565 } 566 return height; 567 } 568 569 static int fb_show_extra_logos(struct fb_info *info, int y, int rotate) 570 { 571 unsigned int i; 572 573 for (i = 0; i < fb_logo_ex_num; i++) 574 y += fb_show_logo_line(info, rotate, 575 fb_logo_ex[i].logo, y, fb_logo_ex[i].n); 576 577 return y; 578 } 579 580 #else /* !CONFIG_FB_LOGO_EXTRA */ 581 582 static inline int fb_prepare_extra_logos(struct fb_info *info, 583 unsigned int height, 584 unsigned int yres) 585 { 586 return height; 587 } 588 589 static inline int fb_show_extra_logos(struct fb_info *info, int y, int rotate) 590 { 591 return y; 592 } 593 594 #endif /* CONFIG_FB_LOGO_EXTRA */ 595 596 597 int fb_prepare_logo(struct fb_info *info, int rotate) 598 { 599 int depth = fb_get_color_depth(&info->var, &info->fix); 600 unsigned int yres; 601 602 memset(&fb_logo, 0, sizeof(struct logo_data)); 603 604 if (info->flags & FBINFO_MISC_TILEBLITTING || 605 info->fbops->owner) 606 return 0; 607 608 if (info->fix.visual == FB_VISUAL_DIRECTCOLOR) { 609 depth = info->var.blue.length; 610 if (info->var.red.length < depth) 611 depth = info->var.red.length; 612 if (info->var.green.length < depth) 613 depth = info->var.green.length; 614 } 615 616 if (info->fix.visual == FB_VISUAL_STATIC_PSEUDOCOLOR && depth > 4) { 617 /* assume console colormap */ 618 depth = 4; 619 } 620 621 /* Return if no suitable logo was found */ 622 fb_logo.logo = fb_find_logo(depth); 623 624 if (!fb_logo.logo) { 625 return 0; 626 } 627 628 if (rotate == FB_ROTATE_UR || rotate == FB_ROTATE_UD) 629 yres = info->var.yres; 630 else 631 yres = info->var.xres; 632 633 if (fb_logo.logo->height > yres) { 634 fb_logo.logo = NULL; 635 return 0; 636 } 637 638 /* What depth we asked for might be different from what we get */ 639 if (fb_logo.logo->type == LINUX_LOGO_CLUT224) 640 fb_logo.depth = 8; 641 else if (fb_logo.logo->type == LINUX_LOGO_VGA16) 642 fb_logo.depth = 4; 643 else 644 fb_logo.depth = 1; 645 646 647 if (fb_logo.depth > 4 && depth > 4) { 648 switch (info->fix.visual) { 649 case FB_VISUAL_TRUECOLOR: 650 fb_logo.needs_truepalette = 1; 651 break; 652 case FB_VISUAL_DIRECTCOLOR: 653 fb_logo.needs_directpalette = 1; 654 fb_logo.needs_cmapreset = 1; 655 break; 656 case FB_VISUAL_PSEUDOCOLOR: 657 fb_logo.needs_cmapreset = 1; 658 break; 659 } 660 } 661 662 return fb_prepare_extra_logos(info, fb_logo.logo->height, yres); 663 } 664 665 int fb_show_logo(struct fb_info *info, int rotate) 666 { 667 int y; 668 669 y = fb_show_logo_line(info, rotate, fb_logo.logo, 0, 670 num_online_cpus()); 671 y = fb_show_extra_logos(info, y, rotate); 672 673 return y; 674 } 675 #else 676 int fb_prepare_logo(struct fb_info *info, int rotate) { return 0; } 677 int fb_show_logo(struct fb_info *info, int rotate) { return 0; } 678 #endif /* CONFIG_LOGO */ 679 EXPORT_SYMBOL(fb_prepare_logo); 680 EXPORT_SYMBOL(fb_show_logo); 681 682 static void *fb_seq_start(struct seq_file *m, loff_t *pos) 683 { 684 mutex_lock(®istration_lock); 685 return (*pos < FB_MAX) ? pos : NULL; 686 } 687 688 static void *fb_seq_next(struct seq_file *m, void *v, loff_t *pos) 689 { 690 (*pos)++; 691 return (*pos < FB_MAX) ? pos : NULL; 692 } 693 694 static void fb_seq_stop(struct seq_file *m, void *v) 695 { 696 mutex_unlock(®istration_lock); 697 } 698 699 static int fb_seq_show(struct seq_file *m, void *v) 700 { 701 int i = *(loff_t *)v; 702 struct fb_info *fi = registered_fb[i]; 703 704 if (fi) 705 seq_printf(m, "%d %s\n", fi->node, fi->fix.id); 706 return 0; 707 } 708 709 static const struct seq_operations proc_fb_seq_ops = { 710 .start = fb_seq_start, 711 .next = fb_seq_next, 712 .stop = fb_seq_stop, 713 .show = fb_seq_show, 714 }; 715 716 /* 717 * We hold a reference to the fb_info in file->private_data, 718 * but if the current registered fb has changed, we don't 719 * actually want to use it. 720 * 721 * So look up the fb_info using the inode minor number, 722 * and just verify it against the reference we have. 723 */ 724 static struct fb_info *file_fb_info(struct file *file) 725 { 726 struct inode *inode = file_inode(file); 727 int fbidx = iminor(inode); 728 struct fb_info *info = registered_fb[fbidx]; 729 730 if (info != file->private_data) 731 info = NULL; 732 return info; 733 } 734 735 static ssize_t 736 fb_read(struct file *file, char __user *buf, size_t count, loff_t *ppos) 737 { 738 unsigned long p = *ppos; 739 struct fb_info *info = file_fb_info(file); 740 u8 *buffer, *dst; 741 u8 __iomem *src; 742 int c, cnt = 0, err = 0; 743 unsigned long total_size; 744 745 if (!info || ! info->screen_base) 746 return -ENODEV; 747 748 if (info->state != FBINFO_STATE_RUNNING) 749 return -EPERM; 750 751 if (info->fbops->fb_read) 752 return info->fbops->fb_read(info, buf, count, ppos); 753 754 total_size = info->screen_size; 755 756 if (total_size == 0) 757 total_size = info->fix.smem_len; 758 759 if (p >= total_size) 760 return 0; 761 762 if (count >= total_size) 763 count = total_size; 764 765 if (count + p > total_size) 766 count = total_size - p; 767 768 buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count, 769 GFP_KERNEL); 770 if (!buffer) 771 return -ENOMEM; 772 773 src = (u8 __iomem *) (info->screen_base + p); 774 775 if (info->fbops->fb_sync) 776 info->fbops->fb_sync(info); 777 778 while (count) { 779 c = (count > PAGE_SIZE) ? PAGE_SIZE : count; 780 dst = buffer; 781 fb_memcpy_fromfb(dst, src, c); 782 dst += c; 783 src += c; 784 785 if (copy_to_user(buf, buffer, c)) { 786 err = -EFAULT; 787 break; 788 } 789 *ppos += c; 790 buf += c; 791 cnt += c; 792 count -= c; 793 } 794 795 kfree(buffer); 796 797 return (err) ? err : cnt; 798 } 799 800 static ssize_t 801 fb_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos) 802 { 803 unsigned long p = *ppos; 804 struct fb_info *info = file_fb_info(file); 805 u8 *buffer, *src; 806 u8 __iomem *dst; 807 int c, cnt = 0, err = 0; 808 unsigned long total_size; 809 810 if (!info || !info->screen_base) 811 return -ENODEV; 812 813 if (info->state != FBINFO_STATE_RUNNING) 814 return -EPERM; 815 816 if (info->fbops->fb_write) 817 return info->fbops->fb_write(info, buf, count, ppos); 818 819 total_size = info->screen_size; 820 821 if (total_size == 0) 822 total_size = info->fix.smem_len; 823 824 if (p > total_size) 825 return -EFBIG; 826 827 if (count > total_size) { 828 err = -EFBIG; 829 count = total_size; 830 } 831 832 if (count + p > total_size) { 833 if (!err) 834 err = -ENOSPC; 835 836 count = total_size - p; 837 } 838 839 buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count, 840 GFP_KERNEL); 841 if (!buffer) 842 return -ENOMEM; 843 844 dst = (u8 __iomem *) (info->screen_base + p); 845 846 if (info->fbops->fb_sync) 847 info->fbops->fb_sync(info); 848 849 while (count) { 850 c = (count > PAGE_SIZE) ? PAGE_SIZE : count; 851 src = buffer; 852 853 if (copy_from_user(src, buf, c)) { 854 err = -EFAULT; 855 break; 856 } 857 858 fb_memcpy_tofb(dst, src, c); 859 dst += c; 860 src += c; 861 *ppos += c; 862 buf += c; 863 cnt += c; 864 count -= c; 865 } 866 867 kfree(buffer); 868 869 return (cnt) ? cnt : err; 870 } 871 872 int 873 fb_pan_display(struct fb_info *info, struct fb_var_screeninfo *var) 874 { 875 struct fb_fix_screeninfo *fix = &info->fix; 876 unsigned int yres = info->var.yres; 877 int err = 0; 878 879 if (var->yoffset > 0) { 880 if (var->vmode & FB_VMODE_YWRAP) { 881 if (!fix->ywrapstep || (var->yoffset % fix->ywrapstep)) 882 err = -EINVAL; 883 else 884 yres = 0; 885 } else if (!fix->ypanstep || (var->yoffset % fix->ypanstep)) 886 err = -EINVAL; 887 } 888 889 if (var->xoffset > 0 && (!fix->xpanstep || 890 (var->xoffset % fix->xpanstep))) 891 err = -EINVAL; 892 893 if (err || !info->fbops->fb_pan_display || 894 var->yoffset > info->var.yres_virtual - yres || 895 var->xoffset > info->var.xres_virtual - info->var.xres) 896 return -EINVAL; 897 898 if ((err = info->fbops->fb_pan_display(var, info))) 899 return err; 900 info->var.xoffset = var->xoffset; 901 info->var.yoffset = var->yoffset; 902 if (var->vmode & FB_VMODE_YWRAP) 903 info->var.vmode |= FB_VMODE_YWRAP; 904 else 905 info->var.vmode &= ~FB_VMODE_YWRAP; 906 return 0; 907 } 908 EXPORT_SYMBOL(fb_pan_display); 909 910 static int fb_check_caps(struct fb_info *info, struct fb_var_screeninfo *var, 911 u32 activate) 912 { 913 struct fb_event event; 914 struct fb_blit_caps caps, fbcaps; 915 int err = 0; 916 917 memset(&caps, 0, sizeof(caps)); 918 memset(&fbcaps, 0, sizeof(fbcaps)); 919 caps.flags = (activate & FB_ACTIVATE_ALL) ? 1 : 0; 920 event.info = info; 921 event.data = ∩︀ 922 fb_notifier_call_chain(FB_EVENT_GET_REQ, &event); 923 info->fbops->fb_get_caps(info, &fbcaps, var); 924 925 if (((fbcaps.x ^ caps.x) & caps.x) || 926 ((fbcaps.y ^ caps.y) & caps.y) || 927 (fbcaps.len < caps.len)) 928 err = -EINVAL; 929 930 return err; 931 } 932 933 int 934 fb_set_var(struct fb_info *info, struct fb_var_screeninfo *var) 935 { 936 int flags = info->flags; 937 int ret = 0; 938 939 if (var->activate & FB_ACTIVATE_INV_MODE) { 940 struct fb_videomode mode1, mode2; 941 942 fb_var_to_videomode(&mode1, var); 943 fb_var_to_videomode(&mode2, &info->var); 944 /* make sure we don't delete the videomode of current var */ 945 ret = fb_mode_is_equal(&mode1, &mode2); 946 947 if (!ret) { 948 struct fb_event event; 949 950 event.info = info; 951 event.data = &mode1; 952 ret = fb_notifier_call_chain(FB_EVENT_MODE_DELETE, &event); 953 } 954 955 if (!ret) 956 fb_delete_videomode(&mode1, &info->modelist); 957 958 959 ret = (ret) ? -EINVAL : 0; 960 goto done; 961 } 962 963 if ((var->activate & FB_ACTIVATE_FORCE) || 964 memcmp(&info->var, var, sizeof(struct fb_var_screeninfo))) { 965 u32 activate = var->activate; 966 967 /* When using FOURCC mode, make sure the red, green, blue and 968 * transp fields are set to 0. 969 */ 970 if ((info->fix.capabilities & FB_CAP_FOURCC) && 971 var->grayscale > 1) { 972 if (var->red.offset || var->green.offset || 973 var->blue.offset || var->transp.offset || 974 var->red.length || var->green.length || 975 var->blue.length || var->transp.length || 976 var->red.msb_right || var->green.msb_right || 977 var->blue.msb_right || var->transp.msb_right) 978 return -EINVAL; 979 } 980 981 if (!info->fbops->fb_check_var) { 982 *var = info->var; 983 goto done; 984 } 985 986 ret = info->fbops->fb_check_var(var, info); 987 988 if (ret) 989 goto done; 990 991 if ((var->activate & FB_ACTIVATE_MASK) == FB_ACTIVATE_NOW) { 992 struct fb_var_screeninfo old_var; 993 struct fb_videomode mode; 994 995 if (info->fbops->fb_get_caps) { 996 ret = fb_check_caps(info, var, activate); 997 998 if (ret) 999 goto done; 1000 } 1001 1002 old_var = info->var; 1003 info->var = *var; 1004 1005 if (info->fbops->fb_set_par) { 1006 ret = info->fbops->fb_set_par(info); 1007 1008 if (ret) { 1009 info->var = old_var; 1010 printk(KERN_WARNING "detected " 1011 "fb_set_par error, " 1012 "error code: %d\n", ret); 1013 goto done; 1014 } 1015 } 1016 1017 fb_pan_display(info, &info->var); 1018 fb_set_cmap(&info->cmap, info); 1019 fb_var_to_videomode(&mode, &info->var); 1020 1021 if (info->modelist.prev && info->modelist.next && 1022 !list_empty(&info->modelist)) 1023 ret = fb_add_videomode(&mode, &info->modelist); 1024 1025 if (!ret && (flags & FBINFO_MISC_USEREVENT)) { 1026 struct fb_event event; 1027 int evnt = (activate & FB_ACTIVATE_ALL) ? 1028 FB_EVENT_MODE_CHANGE_ALL : 1029 FB_EVENT_MODE_CHANGE; 1030 1031 info->flags &= ~FBINFO_MISC_USEREVENT; 1032 event.info = info; 1033 event.data = &mode; 1034 fb_notifier_call_chain(evnt, &event); 1035 } 1036 } 1037 } 1038 1039 done: 1040 return ret; 1041 } 1042 EXPORT_SYMBOL(fb_set_var); 1043 1044 int 1045 fb_blank(struct fb_info *info, int blank) 1046 { 1047 struct fb_event event; 1048 int ret = -EINVAL, early_ret; 1049 1050 if (blank > FB_BLANK_POWERDOWN) 1051 blank = FB_BLANK_POWERDOWN; 1052 1053 event.info = info; 1054 event.data = ␣ 1055 1056 early_ret = fb_notifier_call_chain(FB_EARLY_EVENT_BLANK, &event); 1057 1058 if (info->fbops->fb_blank) 1059 ret = info->fbops->fb_blank(blank, info); 1060 1061 if (!ret) 1062 fb_notifier_call_chain(FB_EVENT_BLANK, &event); 1063 else { 1064 /* 1065 * if fb_blank is failed then revert effects of 1066 * the early blank event. 1067 */ 1068 if (!early_ret) 1069 fb_notifier_call_chain(FB_R_EARLY_EVENT_BLANK, &event); 1070 } 1071 1072 return ret; 1073 } 1074 EXPORT_SYMBOL(fb_blank); 1075 1076 static long do_fb_ioctl(struct fb_info *info, unsigned int cmd, 1077 unsigned long arg) 1078 { 1079 struct fb_ops *fb; 1080 struct fb_var_screeninfo var; 1081 struct fb_fix_screeninfo fix; 1082 struct fb_con2fbmap con2fb; 1083 struct fb_cmap cmap_from; 1084 struct fb_cmap_user cmap; 1085 struct fb_event event; 1086 void __user *argp = (void __user *)arg; 1087 long ret = 0; 1088 1089 switch (cmd) { 1090 case FBIOGET_VSCREENINFO: 1091 if (!lock_fb_info(info)) 1092 return -ENODEV; 1093 var = info->var; 1094 unlock_fb_info(info); 1095 1096 ret = copy_to_user(argp, &var, sizeof(var)) ? -EFAULT : 0; 1097 break; 1098 case FBIOPUT_VSCREENINFO: 1099 if (copy_from_user(&var, argp, sizeof(var))) 1100 return -EFAULT; 1101 console_lock(); 1102 if (!lock_fb_info(info)) { 1103 console_unlock(); 1104 return -ENODEV; 1105 } 1106 info->flags |= FBINFO_MISC_USEREVENT; 1107 ret = fb_set_var(info, &var); 1108 info->flags &= ~FBINFO_MISC_USEREVENT; 1109 unlock_fb_info(info); 1110 console_unlock(); 1111 if (!ret && copy_to_user(argp, &var, sizeof(var))) 1112 ret = -EFAULT; 1113 break; 1114 case FBIOGET_FSCREENINFO: 1115 if (!lock_fb_info(info)) 1116 return -ENODEV; 1117 fix = info->fix; 1118 unlock_fb_info(info); 1119 1120 ret = copy_to_user(argp, &fix, sizeof(fix)) ? -EFAULT : 0; 1121 break; 1122 case FBIOPUTCMAP: 1123 if (copy_from_user(&cmap, argp, sizeof(cmap))) 1124 return -EFAULT; 1125 ret = fb_set_user_cmap(&cmap, info); 1126 break; 1127 case FBIOGETCMAP: 1128 if (copy_from_user(&cmap, argp, sizeof(cmap))) 1129 return -EFAULT; 1130 if (!lock_fb_info(info)) 1131 return -ENODEV; 1132 cmap_from = info->cmap; 1133 unlock_fb_info(info); 1134 ret = fb_cmap_to_user(&cmap_from, &cmap); 1135 break; 1136 case FBIOPAN_DISPLAY: 1137 if (copy_from_user(&var, argp, sizeof(var))) 1138 return -EFAULT; 1139 console_lock(); 1140 if (!lock_fb_info(info)) { 1141 console_unlock(); 1142 return -ENODEV; 1143 } 1144 ret = fb_pan_display(info, &var); 1145 unlock_fb_info(info); 1146 console_unlock(); 1147 if (ret == 0 && copy_to_user(argp, &var, sizeof(var))) 1148 return -EFAULT; 1149 break; 1150 case FBIO_CURSOR: 1151 ret = -EINVAL; 1152 break; 1153 case FBIOGET_CON2FBMAP: 1154 if (copy_from_user(&con2fb, argp, sizeof(con2fb))) 1155 return -EFAULT; 1156 if (con2fb.console < 1 || con2fb.console > MAX_NR_CONSOLES) 1157 return -EINVAL; 1158 con2fb.framebuffer = -1; 1159 event.data = &con2fb; 1160 if (!lock_fb_info(info)) 1161 return -ENODEV; 1162 event.info = info; 1163 fb_notifier_call_chain(FB_EVENT_GET_CONSOLE_MAP, &event); 1164 unlock_fb_info(info); 1165 ret = copy_to_user(argp, &con2fb, sizeof(con2fb)) ? -EFAULT : 0; 1166 break; 1167 case FBIOPUT_CON2FBMAP: 1168 if (copy_from_user(&con2fb, argp, sizeof(con2fb))) 1169 return -EFAULT; 1170 if (con2fb.console < 1 || con2fb.console > MAX_NR_CONSOLES) 1171 return -EINVAL; 1172 if (con2fb.framebuffer >= FB_MAX) 1173 return -EINVAL; 1174 if (!registered_fb[con2fb.framebuffer]) 1175 request_module("fb%d", con2fb.framebuffer); 1176 if (!registered_fb[con2fb.framebuffer]) { 1177 ret = -EINVAL; 1178 break; 1179 } 1180 event.data = &con2fb; 1181 console_lock(); 1182 if (!lock_fb_info(info)) { 1183 console_unlock(); 1184 return -ENODEV; 1185 } 1186 event.info = info; 1187 ret = fb_notifier_call_chain(FB_EVENT_SET_CONSOLE_MAP, &event); 1188 unlock_fb_info(info); 1189 console_unlock(); 1190 break; 1191 case FBIOBLANK: 1192 console_lock(); 1193 if (!lock_fb_info(info)) { 1194 console_unlock(); 1195 return -ENODEV; 1196 } 1197 info->flags |= FBINFO_MISC_USEREVENT; 1198 ret = fb_blank(info, arg); 1199 info->flags &= ~FBINFO_MISC_USEREVENT; 1200 unlock_fb_info(info); 1201 console_unlock(); 1202 break; 1203 default: 1204 if (!lock_fb_info(info)) 1205 return -ENODEV; 1206 fb = info->fbops; 1207 if (fb->fb_ioctl) 1208 ret = fb->fb_ioctl(info, cmd, arg); 1209 else 1210 ret = -ENOTTY; 1211 unlock_fb_info(info); 1212 } 1213 return ret; 1214 } 1215 1216 static long fb_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 1217 { 1218 struct fb_info *info = file_fb_info(file); 1219 1220 if (!info) 1221 return -ENODEV; 1222 return do_fb_ioctl(info, cmd, arg); 1223 } 1224 1225 #ifdef CONFIG_COMPAT 1226 struct fb_fix_screeninfo32 { 1227 char id[16]; 1228 compat_caddr_t smem_start; 1229 u32 smem_len; 1230 u32 type; 1231 u32 type_aux; 1232 u32 visual; 1233 u16 xpanstep; 1234 u16 ypanstep; 1235 u16 ywrapstep; 1236 u32 line_length; 1237 compat_caddr_t mmio_start; 1238 u32 mmio_len; 1239 u32 accel; 1240 u16 reserved[3]; 1241 }; 1242 1243 struct fb_cmap32 { 1244 u32 start; 1245 u32 len; 1246 compat_caddr_t red; 1247 compat_caddr_t green; 1248 compat_caddr_t blue; 1249 compat_caddr_t transp; 1250 }; 1251 1252 static int fb_getput_cmap(struct fb_info *info, unsigned int cmd, 1253 unsigned long arg) 1254 { 1255 struct fb_cmap_user __user *cmap; 1256 struct fb_cmap32 __user *cmap32; 1257 __u32 data; 1258 int err; 1259 1260 cmap = compat_alloc_user_space(sizeof(*cmap)); 1261 cmap32 = compat_ptr(arg); 1262 1263 if (copy_in_user(&cmap->start, &cmap32->start, 2 * sizeof(__u32))) 1264 return -EFAULT; 1265 1266 if (get_user(data, &cmap32->red) || 1267 put_user(compat_ptr(data), &cmap->red) || 1268 get_user(data, &cmap32->green) || 1269 put_user(compat_ptr(data), &cmap->green) || 1270 get_user(data, &cmap32->blue) || 1271 put_user(compat_ptr(data), &cmap->blue) || 1272 get_user(data, &cmap32->transp) || 1273 put_user(compat_ptr(data), &cmap->transp)) 1274 return -EFAULT; 1275 1276 err = do_fb_ioctl(info, cmd, (unsigned long) cmap); 1277 1278 if (!err) { 1279 if (copy_in_user(&cmap32->start, 1280 &cmap->start, 1281 2 * sizeof(__u32))) 1282 err = -EFAULT; 1283 } 1284 return err; 1285 } 1286 1287 static int do_fscreeninfo_to_user(struct fb_fix_screeninfo *fix, 1288 struct fb_fix_screeninfo32 __user *fix32) 1289 { 1290 __u32 data; 1291 int err; 1292 1293 err = copy_to_user(&fix32->id, &fix->id, sizeof(fix32->id)); 1294 1295 data = (__u32) (unsigned long) fix->smem_start; 1296 err |= put_user(data, &fix32->smem_start); 1297 1298 err |= put_user(fix->smem_len, &fix32->smem_len); 1299 err |= put_user(fix->type, &fix32->type); 1300 err |= put_user(fix->type_aux, &fix32->type_aux); 1301 err |= put_user(fix->visual, &fix32->visual); 1302 err |= put_user(fix->xpanstep, &fix32->xpanstep); 1303 err |= put_user(fix->ypanstep, &fix32->ypanstep); 1304 err |= put_user(fix->ywrapstep, &fix32->ywrapstep); 1305 err |= put_user(fix->line_length, &fix32->line_length); 1306 1307 data = (__u32) (unsigned long) fix->mmio_start; 1308 err |= put_user(data, &fix32->mmio_start); 1309 1310 err |= put_user(fix->mmio_len, &fix32->mmio_len); 1311 err |= put_user(fix->accel, &fix32->accel); 1312 err |= copy_to_user(fix32->reserved, fix->reserved, 1313 sizeof(fix->reserved)); 1314 1315 if (err) 1316 return -EFAULT; 1317 return 0; 1318 } 1319 1320 static int fb_get_fscreeninfo(struct fb_info *info, unsigned int cmd, 1321 unsigned long arg) 1322 { 1323 struct fb_fix_screeninfo fix; 1324 1325 if (!lock_fb_info(info)) 1326 return -ENODEV; 1327 fix = info->fix; 1328 unlock_fb_info(info); 1329 return do_fscreeninfo_to_user(&fix, compat_ptr(arg)); 1330 } 1331 1332 static long fb_compat_ioctl(struct file *file, unsigned int cmd, 1333 unsigned long arg) 1334 { 1335 struct fb_info *info = file_fb_info(file); 1336 struct fb_ops *fb; 1337 long ret = -ENOIOCTLCMD; 1338 1339 if (!info) 1340 return -ENODEV; 1341 fb = info->fbops; 1342 switch(cmd) { 1343 case FBIOGET_VSCREENINFO: 1344 case FBIOPUT_VSCREENINFO: 1345 case FBIOPAN_DISPLAY: 1346 case FBIOGET_CON2FBMAP: 1347 case FBIOPUT_CON2FBMAP: 1348 arg = (unsigned long) compat_ptr(arg); 1349 case FBIOBLANK: 1350 ret = do_fb_ioctl(info, cmd, arg); 1351 break; 1352 1353 case FBIOGET_FSCREENINFO: 1354 ret = fb_get_fscreeninfo(info, cmd, arg); 1355 break; 1356 1357 case FBIOGETCMAP: 1358 case FBIOPUTCMAP: 1359 ret = fb_getput_cmap(info, cmd, arg); 1360 break; 1361 1362 default: 1363 if (fb->fb_compat_ioctl) 1364 ret = fb->fb_compat_ioctl(info, cmd, arg); 1365 break; 1366 } 1367 return ret; 1368 } 1369 #endif 1370 1371 static int 1372 fb_mmap(struct file *file, struct vm_area_struct * vma) 1373 { 1374 struct fb_info *info = file_fb_info(file); 1375 struct fb_ops *fb; 1376 unsigned long mmio_pgoff; 1377 unsigned long start; 1378 u32 len; 1379 1380 if (!info) 1381 return -ENODEV; 1382 fb = info->fbops; 1383 if (!fb) 1384 return -ENODEV; 1385 mutex_lock(&info->mm_lock); 1386 if (fb->fb_mmap) { 1387 int res; 1388 1389 /* 1390 * The framebuffer needs to be accessed decrypted, be sure 1391 * SME protection is removed ahead of the call 1392 */ 1393 vma->vm_page_prot = pgprot_decrypted(vma->vm_page_prot); 1394 res = fb->fb_mmap(info, vma); 1395 mutex_unlock(&info->mm_lock); 1396 return res; 1397 } 1398 1399 /* 1400 * Ugh. This can be either the frame buffer mapping, or 1401 * if pgoff points past it, the mmio mapping. 1402 */ 1403 start = info->fix.smem_start; 1404 len = info->fix.smem_len; 1405 mmio_pgoff = PAGE_ALIGN((start & ~PAGE_MASK) + len) >> PAGE_SHIFT; 1406 if (vma->vm_pgoff >= mmio_pgoff) { 1407 if (info->var.accel_flags) { 1408 mutex_unlock(&info->mm_lock); 1409 return -EINVAL; 1410 } 1411 1412 vma->vm_pgoff -= mmio_pgoff; 1413 start = info->fix.mmio_start; 1414 len = info->fix.mmio_len; 1415 } 1416 mutex_unlock(&info->mm_lock); 1417 1418 vma->vm_page_prot = vm_get_page_prot(vma->vm_flags); 1419 /* 1420 * The framebuffer needs to be accessed decrypted, be sure 1421 * SME protection is removed 1422 */ 1423 vma->vm_page_prot = pgprot_decrypted(vma->vm_page_prot); 1424 fb_pgprotect(file, vma, start); 1425 1426 return vm_iomap_memory(vma, start, len); 1427 } 1428 1429 static int 1430 fb_open(struct inode *inode, struct file *file) 1431 __acquires(&info->lock) 1432 __releases(&info->lock) 1433 { 1434 int fbidx = iminor(inode); 1435 struct fb_info *info; 1436 int res = 0; 1437 1438 info = get_fb_info(fbidx); 1439 if (!info) { 1440 request_module("fb%d", fbidx); 1441 info = get_fb_info(fbidx); 1442 if (!info) 1443 return -ENODEV; 1444 } 1445 if (IS_ERR(info)) 1446 return PTR_ERR(info); 1447 1448 mutex_lock(&info->lock); 1449 if (!try_module_get(info->fbops->owner)) { 1450 res = -ENODEV; 1451 goto out; 1452 } 1453 file->private_data = info; 1454 if (info->fbops->fb_open) { 1455 res = info->fbops->fb_open(info,1); 1456 if (res) 1457 module_put(info->fbops->owner); 1458 } 1459 #ifdef CONFIG_FB_DEFERRED_IO 1460 if (info->fbdefio) 1461 fb_deferred_io_open(info, inode, file); 1462 #endif 1463 out: 1464 mutex_unlock(&info->lock); 1465 if (res) 1466 put_fb_info(info); 1467 return res; 1468 } 1469 1470 static int 1471 fb_release(struct inode *inode, struct file *file) 1472 __acquires(&info->lock) 1473 __releases(&info->lock) 1474 { 1475 struct fb_info * const info = file->private_data; 1476 1477 mutex_lock(&info->lock); 1478 if (info->fbops->fb_release) 1479 info->fbops->fb_release(info,1); 1480 module_put(info->fbops->owner); 1481 mutex_unlock(&info->lock); 1482 put_fb_info(info); 1483 return 0; 1484 } 1485 1486 #if defined(CONFIG_FB_PROVIDE_GET_FB_UNMAPPED_AREA) && !defined(CONFIG_MMU) 1487 unsigned long get_fb_unmapped_area(struct file *filp, 1488 unsigned long addr, unsigned long len, 1489 unsigned long pgoff, unsigned long flags) 1490 { 1491 struct fb_info * const info = filp->private_data; 1492 unsigned long fb_size = PAGE_ALIGN(info->fix.smem_len); 1493 1494 if (pgoff > fb_size || len > fb_size - pgoff) 1495 return -EINVAL; 1496 1497 return (unsigned long)info->screen_base + pgoff; 1498 } 1499 #endif 1500 1501 static const struct file_operations fb_fops = { 1502 .owner = THIS_MODULE, 1503 .read = fb_read, 1504 .write = fb_write, 1505 .unlocked_ioctl = fb_ioctl, 1506 #ifdef CONFIG_COMPAT 1507 .compat_ioctl = fb_compat_ioctl, 1508 #endif 1509 .mmap = fb_mmap, 1510 .open = fb_open, 1511 .release = fb_release, 1512 #if defined(HAVE_ARCH_FB_UNMAPPED_AREA) || \ 1513 (defined(CONFIG_FB_PROVIDE_GET_FB_UNMAPPED_AREA) && \ 1514 !defined(CONFIG_MMU)) 1515 .get_unmapped_area = get_fb_unmapped_area, 1516 #endif 1517 #ifdef CONFIG_FB_DEFERRED_IO 1518 .fsync = fb_deferred_io_fsync, 1519 #endif 1520 .llseek = default_llseek, 1521 }; 1522 1523 struct class *fb_class; 1524 EXPORT_SYMBOL(fb_class); 1525 1526 static int fb_check_foreignness(struct fb_info *fi) 1527 { 1528 const bool foreign_endian = fi->flags & FBINFO_FOREIGN_ENDIAN; 1529 1530 fi->flags &= ~FBINFO_FOREIGN_ENDIAN; 1531 1532 #ifdef __BIG_ENDIAN 1533 fi->flags |= foreign_endian ? 0 : FBINFO_BE_MATH; 1534 #else 1535 fi->flags |= foreign_endian ? FBINFO_BE_MATH : 0; 1536 #endif /* __BIG_ENDIAN */ 1537 1538 if (fi->flags & FBINFO_BE_MATH && !fb_be_math(fi)) { 1539 pr_err("%s: enable CONFIG_FB_BIG_ENDIAN to " 1540 "support this framebuffer\n", fi->fix.id); 1541 return -ENOSYS; 1542 } else if (!(fi->flags & FBINFO_BE_MATH) && fb_be_math(fi)) { 1543 pr_err("%s: enable CONFIG_FB_LITTLE_ENDIAN to " 1544 "support this framebuffer\n", fi->fix.id); 1545 return -ENOSYS; 1546 } 1547 1548 return 0; 1549 } 1550 1551 static bool apertures_overlap(struct aperture *gen, struct aperture *hw) 1552 { 1553 /* is the generic aperture base the same as the HW one */ 1554 if (gen->base == hw->base) 1555 return true; 1556 /* is the generic aperture base inside the hw base->hw base+size */ 1557 if (gen->base > hw->base && gen->base < hw->base + hw->size) 1558 return true; 1559 return false; 1560 } 1561 1562 static bool fb_do_apertures_overlap(struct apertures_struct *gena, 1563 struct apertures_struct *hwa) 1564 { 1565 int i, j; 1566 if (!hwa || !gena) 1567 return false; 1568 1569 for (i = 0; i < hwa->count; ++i) { 1570 struct aperture *h = &hwa->ranges[i]; 1571 for (j = 0; j < gena->count; ++j) { 1572 struct aperture *g = &gena->ranges[j]; 1573 printk(KERN_DEBUG "checking generic (%llx %llx) vs hw (%llx %llx)\n", 1574 (unsigned long long)g->base, 1575 (unsigned long long)g->size, 1576 (unsigned long long)h->base, 1577 (unsigned long long)h->size); 1578 if (apertures_overlap(g, h)) 1579 return true; 1580 } 1581 } 1582 1583 return false; 1584 } 1585 1586 static int do_unregister_framebuffer(struct fb_info *fb_info); 1587 1588 #define VGA_FB_PHYS 0xA0000 1589 static int do_remove_conflicting_framebuffers(struct apertures_struct *a, 1590 const char *name, bool primary) 1591 { 1592 int i, ret; 1593 1594 /* check all firmware fbs and kick off if the base addr overlaps */ 1595 for (i = 0 ; i < FB_MAX; i++) { 1596 struct apertures_struct *gen_aper; 1597 if (!registered_fb[i]) 1598 continue; 1599 1600 if (!(registered_fb[i]->flags & FBINFO_MISC_FIRMWARE)) 1601 continue; 1602 1603 gen_aper = registered_fb[i]->apertures; 1604 if (fb_do_apertures_overlap(gen_aper, a) || 1605 (primary && gen_aper && gen_aper->count && 1606 gen_aper->ranges[0].base == VGA_FB_PHYS)) { 1607 1608 printk(KERN_INFO "fb: switching to %s from %s\n", 1609 name, registered_fb[i]->fix.id); 1610 ret = do_unregister_framebuffer(registered_fb[i]); 1611 if (ret) 1612 return ret; 1613 } 1614 } 1615 1616 return 0; 1617 } 1618 1619 static bool lockless_register_fb; 1620 module_param_named_unsafe(lockless_register_fb, lockless_register_fb, bool, 0400); 1621 MODULE_PARM_DESC(lockless_register_fb, 1622 "Lockless framebuffer registration for debugging [default=off]"); 1623 1624 static int do_register_framebuffer(struct fb_info *fb_info) 1625 { 1626 int i, ret; 1627 struct fb_event event; 1628 struct fb_videomode mode; 1629 1630 if (fb_check_foreignness(fb_info)) 1631 return -ENOSYS; 1632 1633 ret = do_remove_conflicting_framebuffers(fb_info->apertures, 1634 fb_info->fix.id, 1635 fb_is_primary_device(fb_info)); 1636 if (ret) 1637 return ret; 1638 1639 if (num_registered_fb == FB_MAX) 1640 return -ENXIO; 1641 1642 num_registered_fb++; 1643 for (i = 0 ; i < FB_MAX; i++) 1644 if (!registered_fb[i]) 1645 break; 1646 fb_info->node = i; 1647 atomic_set(&fb_info->count, 1); 1648 mutex_init(&fb_info->lock); 1649 mutex_init(&fb_info->mm_lock); 1650 1651 fb_info->dev = device_create(fb_class, fb_info->device, 1652 MKDEV(FB_MAJOR, i), NULL, "fb%d", i); 1653 if (IS_ERR(fb_info->dev)) { 1654 /* Not fatal */ 1655 printk(KERN_WARNING "Unable to create device for framebuffer %d; errno = %ld\n", i, PTR_ERR(fb_info->dev)); 1656 fb_info->dev = NULL; 1657 } else 1658 fb_init_device(fb_info); 1659 1660 if (fb_info->pixmap.addr == NULL) { 1661 fb_info->pixmap.addr = kmalloc(FBPIXMAPSIZE, GFP_KERNEL); 1662 if (fb_info->pixmap.addr) { 1663 fb_info->pixmap.size = FBPIXMAPSIZE; 1664 fb_info->pixmap.buf_align = 1; 1665 fb_info->pixmap.scan_align = 1; 1666 fb_info->pixmap.access_align = 32; 1667 fb_info->pixmap.flags = FB_PIXMAP_DEFAULT; 1668 } 1669 } 1670 fb_info->pixmap.offset = 0; 1671 1672 if (!fb_info->pixmap.blit_x) 1673 fb_info->pixmap.blit_x = ~(u32)0; 1674 1675 if (!fb_info->pixmap.blit_y) 1676 fb_info->pixmap.blit_y = ~(u32)0; 1677 1678 if (!fb_info->modelist.prev || !fb_info->modelist.next) 1679 INIT_LIST_HEAD(&fb_info->modelist); 1680 1681 if (fb_info->skip_vt_switch) 1682 pm_vt_switch_required(fb_info->dev, false); 1683 else 1684 pm_vt_switch_required(fb_info->dev, true); 1685 1686 fb_var_to_videomode(&mode, &fb_info->var); 1687 fb_add_videomode(&mode, &fb_info->modelist); 1688 registered_fb[i] = fb_info; 1689 1690 event.info = fb_info; 1691 if (!lockless_register_fb) 1692 console_lock(); 1693 if (!lock_fb_info(fb_info)) { 1694 if (!lockless_register_fb) 1695 console_unlock(); 1696 return -ENODEV; 1697 } 1698 1699 fb_notifier_call_chain(FB_EVENT_FB_REGISTERED, &event); 1700 unlock_fb_info(fb_info); 1701 if (!lockless_register_fb) 1702 console_unlock(); 1703 return 0; 1704 } 1705 1706 static int do_unregister_framebuffer(struct fb_info *fb_info) 1707 { 1708 struct fb_event event; 1709 int i, ret = 0; 1710 1711 i = fb_info->node; 1712 if (i < 0 || i >= FB_MAX || registered_fb[i] != fb_info) 1713 return -EINVAL; 1714 1715 console_lock(); 1716 if (!lock_fb_info(fb_info)) { 1717 console_unlock(); 1718 return -ENODEV; 1719 } 1720 1721 event.info = fb_info; 1722 ret = fb_notifier_call_chain(FB_EVENT_FB_UNBIND, &event); 1723 unlock_fb_info(fb_info); 1724 console_unlock(); 1725 1726 if (ret) 1727 return -EINVAL; 1728 1729 pm_vt_switch_unregister(fb_info->dev); 1730 1731 unlink_framebuffer(fb_info); 1732 if (fb_info->pixmap.addr && 1733 (fb_info->pixmap.flags & FB_PIXMAP_DEFAULT)) 1734 kfree(fb_info->pixmap.addr); 1735 fb_destroy_modelist(&fb_info->modelist); 1736 registered_fb[i] = NULL; 1737 num_registered_fb--; 1738 fb_cleanup_device(fb_info); 1739 event.info = fb_info; 1740 console_lock(); 1741 fb_notifier_call_chain(FB_EVENT_FB_UNREGISTERED, &event); 1742 console_unlock(); 1743 1744 /* this may free fb info */ 1745 put_fb_info(fb_info); 1746 return 0; 1747 } 1748 1749 int unlink_framebuffer(struct fb_info *fb_info) 1750 { 1751 int i; 1752 1753 i = fb_info->node; 1754 if (i < 0 || i >= FB_MAX || registered_fb[i] != fb_info) 1755 return -EINVAL; 1756 1757 if (fb_info->dev) { 1758 device_destroy(fb_class, MKDEV(FB_MAJOR, i)); 1759 fb_info->dev = NULL; 1760 } 1761 return 0; 1762 } 1763 EXPORT_SYMBOL(unlink_framebuffer); 1764 1765 int remove_conflicting_framebuffers(struct apertures_struct *a, 1766 const char *name, bool primary) 1767 { 1768 int ret; 1769 1770 mutex_lock(®istration_lock); 1771 ret = do_remove_conflicting_framebuffers(a, name, primary); 1772 mutex_unlock(®istration_lock); 1773 1774 return ret; 1775 } 1776 EXPORT_SYMBOL(remove_conflicting_framebuffers); 1777 1778 /** 1779 * register_framebuffer - registers a frame buffer device 1780 * @fb_info: frame buffer info structure 1781 * 1782 * Registers a frame buffer device @fb_info. 1783 * 1784 * Returns negative errno on error, or zero for success. 1785 * 1786 */ 1787 int 1788 register_framebuffer(struct fb_info *fb_info) 1789 { 1790 int ret; 1791 1792 mutex_lock(®istration_lock); 1793 ret = do_register_framebuffer(fb_info); 1794 mutex_unlock(®istration_lock); 1795 1796 return ret; 1797 } 1798 EXPORT_SYMBOL(register_framebuffer); 1799 1800 /** 1801 * unregister_framebuffer - releases a frame buffer device 1802 * @fb_info: frame buffer info structure 1803 * 1804 * Unregisters a frame buffer device @fb_info. 1805 * 1806 * Returns negative errno on error, or zero for success. 1807 * 1808 * This function will also notify the framebuffer console 1809 * to release the driver. 1810 * 1811 * This is meant to be called within a driver's module_exit() 1812 * function. If this is called outside module_exit(), ensure 1813 * that the driver implements fb_open() and fb_release() to 1814 * check that no processes are using the device. 1815 */ 1816 int 1817 unregister_framebuffer(struct fb_info *fb_info) 1818 { 1819 int ret; 1820 1821 mutex_lock(®istration_lock); 1822 ret = do_unregister_framebuffer(fb_info); 1823 mutex_unlock(®istration_lock); 1824 1825 return ret; 1826 } 1827 EXPORT_SYMBOL(unregister_framebuffer); 1828 1829 /** 1830 * fb_set_suspend - low level driver signals suspend 1831 * @info: framebuffer affected 1832 * @state: 0 = resuming, !=0 = suspending 1833 * 1834 * This is meant to be used by low level drivers to 1835 * signal suspend/resume to the core & clients. 1836 * It must be called with the console semaphore held 1837 */ 1838 void fb_set_suspend(struct fb_info *info, int state) 1839 { 1840 struct fb_event event; 1841 1842 event.info = info; 1843 if (state) { 1844 fb_notifier_call_chain(FB_EVENT_SUSPEND, &event); 1845 info->state = FBINFO_STATE_SUSPENDED; 1846 } else { 1847 info->state = FBINFO_STATE_RUNNING; 1848 fb_notifier_call_chain(FB_EVENT_RESUME, &event); 1849 } 1850 } 1851 EXPORT_SYMBOL(fb_set_suspend); 1852 1853 /** 1854 * fbmem_init - init frame buffer subsystem 1855 * 1856 * Initialize the frame buffer subsystem. 1857 * 1858 * NOTE: This function is _only_ to be called by drivers/char/mem.c. 1859 * 1860 */ 1861 1862 static int __init 1863 fbmem_init(void) 1864 { 1865 int ret; 1866 1867 if (!proc_create_seq("fb", 0, NULL, &proc_fb_seq_ops)) 1868 return -ENOMEM; 1869 1870 ret = register_chrdev(FB_MAJOR, "fb", &fb_fops); 1871 if (ret) { 1872 printk("unable to get major %d for fb devs\n", FB_MAJOR); 1873 goto err_chrdev; 1874 } 1875 1876 fb_class = class_create(THIS_MODULE, "graphics"); 1877 if (IS_ERR(fb_class)) { 1878 ret = PTR_ERR(fb_class); 1879 pr_warn("Unable to create fb class; errno = %d\n", ret); 1880 fb_class = NULL; 1881 goto err_class; 1882 } 1883 1884 fb_console_init(); 1885 1886 return 0; 1887 1888 err_class: 1889 unregister_chrdev(FB_MAJOR, "fb"); 1890 err_chrdev: 1891 remove_proc_entry("fb", NULL); 1892 return ret; 1893 } 1894 1895 #ifdef MODULE 1896 module_init(fbmem_init); 1897 static void __exit 1898 fbmem_exit(void) 1899 { 1900 fb_console_exit(); 1901 1902 remove_proc_entry("fb", NULL); 1903 class_destroy(fb_class); 1904 unregister_chrdev(FB_MAJOR, "fb"); 1905 } 1906 1907 module_exit(fbmem_exit); 1908 MODULE_LICENSE("GPL"); 1909 MODULE_DESCRIPTION("Framebuffer base"); 1910 #else 1911 subsys_initcall(fbmem_init); 1912 #endif 1913 1914 int fb_new_modelist(struct fb_info *info) 1915 { 1916 struct fb_event event; 1917 struct fb_var_screeninfo var = info->var; 1918 struct list_head *pos, *n; 1919 struct fb_modelist *modelist; 1920 struct fb_videomode *m, mode; 1921 int err = 1; 1922 1923 list_for_each_safe(pos, n, &info->modelist) { 1924 modelist = list_entry(pos, struct fb_modelist, list); 1925 m = &modelist->mode; 1926 fb_videomode_to_var(&var, m); 1927 var.activate = FB_ACTIVATE_TEST; 1928 err = fb_set_var(info, &var); 1929 fb_var_to_videomode(&mode, &var); 1930 if (err || !fb_mode_is_equal(m, &mode)) { 1931 list_del(pos); 1932 kfree(pos); 1933 } 1934 } 1935 1936 err = 1; 1937 1938 if (!list_empty(&info->modelist)) { 1939 event.info = info; 1940 err = fb_notifier_call_chain(FB_EVENT_NEW_MODELIST, &event); 1941 } 1942 1943 return err; 1944 } 1945 1946 MODULE_LICENSE("GPL"); 1947