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_array(logo->width, logo->height, 493 GFP_KERNEL); 494 if (logo_new == NULL) { 495 kfree(palette); 496 if (saved_pseudo_palette) 497 info->pseudo_palette = saved_pseudo_palette; 498 return 0; 499 } 500 image.data = logo_new; 501 fb_set_logo(info, logo, logo_new, fb_logo.depth); 502 } 503 504 image.dx = 0; 505 image.dy = y; 506 image.width = logo->width; 507 image.height = logo->height; 508 509 if (rotate) { 510 logo_rotate = kmalloc_array(logo->width, logo->height, 511 GFP_KERNEL); 512 if (logo_rotate) 513 fb_rotate_logo(info, logo_rotate, &image, rotate); 514 } 515 516 fb_do_show_logo(info, &image, rotate, n); 517 518 kfree(palette); 519 if (saved_pseudo_palette != NULL) 520 info->pseudo_palette = saved_pseudo_palette; 521 kfree(logo_new); 522 kfree(logo_rotate); 523 return logo->height; 524 } 525 526 527 #ifdef CONFIG_FB_LOGO_EXTRA 528 529 #define FB_LOGO_EX_NUM_MAX 10 530 static struct logo_data_extra { 531 const struct linux_logo *logo; 532 unsigned int n; 533 } fb_logo_ex[FB_LOGO_EX_NUM_MAX]; 534 static unsigned int fb_logo_ex_num; 535 536 void fb_append_extra_logo(const struct linux_logo *logo, unsigned int n) 537 { 538 if (!n || fb_logo_ex_num == FB_LOGO_EX_NUM_MAX) 539 return; 540 541 fb_logo_ex[fb_logo_ex_num].logo = logo; 542 fb_logo_ex[fb_logo_ex_num].n = n; 543 fb_logo_ex_num++; 544 } 545 546 static int fb_prepare_extra_logos(struct fb_info *info, unsigned int height, 547 unsigned int yres) 548 { 549 unsigned int i; 550 551 /* FIXME: logo_ex supports only truecolor fb. */ 552 if (info->fix.visual != FB_VISUAL_TRUECOLOR) 553 fb_logo_ex_num = 0; 554 555 for (i = 0; i < fb_logo_ex_num; i++) { 556 if (fb_logo_ex[i].logo->type != fb_logo.logo->type) { 557 fb_logo_ex[i].logo = NULL; 558 continue; 559 } 560 height += fb_logo_ex[i].logo->height; 561 if (height > yres) { 562 height -= fb_logo_ex[i].logo->height; 563 fb_logo_ex_num = i; 564 break; 565 } 566 } 567 return height; 568 } 569 570 static int fb_show_extra_logos(struct fb_info *info, int y, int rotate) 571 { 572 unsigned int i; 573 574 for (i = 0; i < fb_logo_ex_num; i++) 575 y += fb_show_logo_line(info, rotate, 576 fb_logo_ex[i].logo, y, fb_logo_ex[i].n); 577 578 return y; 579 } 580 581 #else /* !CONFIG_FB_LOGO_EXTRA */ 582 583 static inline int fb_prepare_extra_logos(struct fb_info *info, 584 unsigned int height, 585 unsigned int yres) 586 { 587 return height; 588 } 589 590 static inline int fb_show_extra_logos(struct fb_info *info, int y, int rotate) 591 { 592 return y; 593 } 594 595 #endif /* CONFIG_FB_LOGO_EXTRA */ 596 597 598 int fb_prepare_logo(struct fb_info *info, int rotate) 599 { 600 int depth = fb_get_color_depth(&info->var, &info->fix); 601 unsigned int yres; 602 603 memset(&fb_logo, 0, sizeof(struct logo_data)); 604 605 if (info->flags & FBINFO_MISC_TILEBLITTING || 606 info->fbops->owner) 607 return 0; 608 609 if (info->fix.visual == FB_VISUAL_DIRECTCOLOR) { 610 depth = info->var.blue.length; 611 if (info->var.red.length < depth) 612 depth = info->var.red.length; 613 if (info->var.green.length < depth) 614 depth = info->var.green.length; 615 } 616 617 if (info->fix.visual == FB_VISUAL_STATIC_PSEUDOCOLOR && depth > 4) { 618 /* assume console colormap */ 619 depth = 4; 620 } 621 622 /* Return if no suitable logo was found */ 623 fb_logo.logo = fb_find_logo(depth); 624 625 if (!fb_logo.logo) { 626 return 0; 627 } 628 629 if (rotate == FB_ROTATE_UR || rotate == FB_ROTATE_UD) 630 yres = info->var.yres; 631 else 632 yres = info->var.xres; 633 634 if (fb_logo.logo->height > yres) { 635 fb_logo.logo = NULL; 636 return 0; 637 } 638 639 /* What depth we asked for might be different from what we get */ 640 if (fb_logo.logo->type == LINUX_LOGO_CLUT224) 641 fb_logo.depth = 8; 642 else if (fb_logo.logo->type == LINUX_LOGO_VGA16) 643 fb_logo.depth = 4; 644 else 645 fb_logo.depth = 1; 646 647 648 if (fb_logo.depth > 4 && depth > 4) { 649 switch (info->fix.visual) { 650 case FB_VISUAL_TRUECOLOR: 651 fb_logo.needs_truepalette = 1; 652 break; 653 case FB_VISUAL_DIRECTCOLOR: 654 fb_logo.needs_directpalette = 1; 655 fb_logo.needs_cmapreset = 1; 656 break; 657 case FB_VISUAL_PSEUDOCOLOR: 658 fb_logo.needs_cmapreset = 1; 659 break; 660 } 661 } 662 663 return fb_prepare_extra_logos(info, fb_logo.logo->height, yres); 664 } 665 666 int fb_show_logo(struct fb_info *info, int rotate) 667 { 668 int y; 669 670 y = fb_show_logo_line(info, rotate, fb_logo.logo, 0, 671 num_online_cpus()); 672 y = fb_show_extra_logos(info, y, rotate); 673 674 return y; 675 } 676 #else 677 int fb_prepare_logo(struct fb_info *info, int rotate) { return 0; } 678 int fb_show_logo(struct fb_info *info, int rotate) { return 0; } 679 #endif /* CONFIG_LOGO */ 680 EXPORT_SYMBOL(fb_prepare_logo); 681 EXPORT_SYMBOL(fb_show_logo); 682 683 static void *fb_seq_start(struct seq_file *m, loff_t *pos) 684 { 685 mutex_lock(®istration_lock); 686 return (*pos < FB_MAX) ? pos : NULL; 687 } 688 689 static void *fb_seq_next(struct seq_file *m, void *v, loff_t *pos) 690 { 691 (*pos)++; 692 return (*pos < FB_MAX) ? pos : NULL; 693 } 694 695 static void fb_seq_stop(struct seq_file *m, void *v) 696 { 697 mutex_unlock(®istration_lock); 698 } 699 700 static int fb_seq_show(struct seq_file *m, void *v) 701 { 702 int i = *(loff_t *)v; 703 struct fb_info *fi = registered_fb[i]; 704 705 if (fi) 706 seq_printf(m, "%d %s\n", fi->node, fi->fix.id); 707 return 0; 708 } 709 710 static const struct seq_operations proc_fb_seq_ops = { 711 .start = fb_seq_start, 712 .next = fb_seq_next, 713 .stop = fb_seq_stop, 714 .show = fb_seq_show, 715 }; 716 717 /* 718 * We hold a reference to the fb_info in file->private_data, 719 * but if the current registered fb has changed, we don't 720 * actually want to use it. 721 * 722 * So look up the fb_info using the inode minor number, 723 * and just verify it against the reference we have. 724 */ 725 static struct fb_info *file_fb_info(struct file *file) 726 { 727 struct inode *inode = file_inode(file); 728 int fbidx = iminor(inode); 729 struct fb_info *info = registered_fb[fbidx]; 730 731 if (info != file->private_data) 732 info = NULL; 733 return info; 734 } 735 736 static ssize_t 737 fb_read(struct file *file, char __user *buf, size_t count, loff_t *ppos) 738 { 739 unsigned long p = *ppos; 740 struct fb_info *info = file_fb_info(file); 741 u8 *buffer, *dst; 742 u8 __iomem *src; 743 int c, cnt = 0, err = 0; 744 unsigned long total_size; 745 746 if (!info || ! info->screen_base) 747 return -ENODEV; 748 749 if (info->state != FBINFO_STATE_RUNNING) 750 return -EPERM; 751 752 if (info->fbops->fb_read) 753 return info->fbops->fb_read(info, buf, count, ppos); 754 755 total_size = info->screen_size; 756 757 if (total_size == 0) 758 total_size = info->fix.smem_len; 759 760 if (p >= total_size) 761 return 0; 762 763 if (count >= total_size) 764 count = total_size; 765 766 if (count + p > total_size) 767 count = total_size - p; 768 769 buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count, 770 GFP_KERNEL); 771 if (!buffer) 772 return -ENOMEM; 773 774 src = (u8 __iomem *) (info->screen_base + p); 775 776 if (info->fbops->fb_sync) 777 info->fbops->fb_sync(info); 778 779 while (count) { 780 c = (count > PAGE_SIZE) ? PAGE_SIZE : count; 781 dst = buffer; 782 fb_memcpy_fromfb(dst, src, c); 783 dst += c; 784 src += c; 785 786 if (copy_to_user(buf, buffer, c)) { 787 err = -EFAULT; 788 break; 789 } 790 *ppos += c; 791 buf += c; 792 cnt += c; 793 count -= c; 794 } 795 796 kfree(buffer); 797 798 return (err) ? err : cnt; 799 } 800 801 static ssize_t 802 fb_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos) 803 { 804 unsigned long p = *ppos; 805 struct fb_info *info = file_fb_info(file); 806 u8 *buffer, *src; 807 u8 __iomem *dst; 808 int c, cnt = 0, err = 0; 809 unsigned long total_size; 810 811 if (!info || !info->screen_base) 812 return -ENODEV; 813 814 if (info->state != FBINFO_STATE_RUNNING) 815 return -EPERM; 816 817 if (info->fbops->fb_write) 818 return info->fbops->fb_write(info, buf, count, ppos); 819 820 total_size = info->screen_size; 821 822 if (total_size == 0) 823 total_size = info->fix.smem_len; 824 825 if (p > total_size) 826 return -EFBIG; 827 828 if (count > total_size) { 829 err = -EFBIG; 830 count = total_size; 831 } 832 833 if (count + p > total_size) { 834 if (!err) 835 err = -ENOSPC; 836 837 count = total_size - p; 838 } 839 840 buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count, 841 GFP_KERNEL); 842 if (!buffer) 843 return -ENOMEM; 844 845 dst = (u8 __iomem *) (info->screen_base + p); 846 847 if (info->fbops->fb_sync) 848 info->fbops->fb_sync(info); 849 850 while (count) { 851 c = (count > PAGE_SIZE) ? PAGE_SIZE : count; 852 src = buffer; 853 854 if (copy_from_user(src, buf, c)) { 855 err = -EFAULT; 856 break; 857 } 858 859 fb_memcpy_tofb(dst, src, c); 860 dst += c; 861 src += c; 862 *ppos += c; 863 buf += c; 864 cnt += c; 865 count -= c; 866 } 867 868 kfree(buffer); 869 870 return (cnt) ? cnt : err; 871 } 872 873 int 874 fb_pan_display(struct fb_info *info, struct fb_var_screeninfo *var) 875 { 876 struct fb_fix_screeninfo *fix = &info->fix; 877 unsigned int yres = info->var.yres; 878 int err = 0; 879 880 if (var->yoffset > 0) { 881 if (var->vmode & FB_VMODE_YWRAP) { 882 if (!fix->ywrapstep || (var->yoffset % fix->ywrapstep)) 883 err = -EINVAL; 884 else 885 yres = 0; 886 } else if (!fix->ypanstep || (var->yoffset % fix->ypanstep)) 887 err = -EINVAL; 888 } 889 890 if (var->xoffset > 0 && (!fix->xpanstep || 891 (var->xoffset % fix->xpanstep))) 892 err = -EINVAL; 893 894 if (err || !info->fbops->fb_pan_display || 895 var->yoffset > info->var.yres_virtual - yres || 896 var->xoffset > info->var.xres_virtual - info->var.xres) 897 return -EINVAL; 898 899 if ((err = info->fbops->fb_pan_display(var, info))) 900 return err; 901 info->var.xoffset = var->xoffset; 902 info->var.yoffset = var->yoffset; 903 if (var->vmode & FB_VMODE_YWRAP) 904 info->var.vmode |= FB_VMODE_YWRAP; 905 else 906 info->var.vmode &= ~FB_VMODE_YWRAP; 907 return 0; 908 } 909 EXPORT_SYMBOL(fb_pan_display); 910 911 static int fb_check_caps(struct fb_info *info, struct fb_var_screeninfo *var, 912 u32 activate) 913 { 914 struct fb_event event; 915 struct fb_blit_caps caps, fbcaps; 916 int err = 0; 917 918 memset(&caps, 0, sizeof(caps)); 919 memset(&fbcaps, 0, sizeof(fbcaps)); 920 caps.flags = (activate & FB_ACTIVATE_ALL) ? 1 : 0; 921 event.info = info; 922 event.data = ∩︀ 923 fb_notifier_call_chain(FB_EVENT_GET_REQ, &event); 924 info->fbops->fb_get_caps(info, &fbcaps, var); 925 926 if (((fbcaps.x ^ caps.x) & caps.x) || 927 ((fbcaps.y ^ caps.y) & caps.y) || 928 (fbcaps.len < caps.len)) 929 err = -EINVAL; 930 931 return err; 932 } 933 934 int 935 fb_set_var(struct fb_info *info, struct fb_var_screeninfo *var) 936 { 937 int flags = info->flags; 938 int ret = 0; 939 940 if (var->activate & FB_ACTIVATE_INV_MODE) { 941 struct fb_videomode mode1, mode2; 942 943 fb_var_to_videomode(&mode1, var); 944 fb_var_to_videomode(&mode2, &info->var); 945 /* make sure we don't delete the videomode of current var */ 946 ret = fb_mode_is_equal(&mode1, &mode2); 947 948 if (!ret) { 949 struct fb_event event; 950 951 event.info = info; 952 event.data = &mode1; 953 ret = fb_notifier_call_chain(FB_EVENT_MODE_DELETE, &event); 954 } 955 956 if (!ret) 957 fb_delete_videomode(&mode1, &info->modelist); 958 959 960 ret = (ret) ? -EINVAL : 0; 961 goto done; 962 } 963 964 if ((var->activate & FB_ACTIVATE_FORCE) || 965 memcmp(&info->var, var, sizeof(struct fb_var_screeninfo))) { 966 u32 activate = var->activate; 967 968 /* When using FOURCC mode, make sure the red, green, blue and 969 * transp fields are set to 0. 970 */ 971 if ((info->fix.capabilities & FB_CAP_FOURCC) && 972 var->grayscale > 1) { 973 if (var->red.offset || var->green.offset || 974 var->blue.offset || var->transp.offset || 975 var->red.length || var->green.length || 976 var->blue.length || var->transp.length || 977 var->red.msb_right || var->green.msb_right || 978 var->blue.msb_right || var->transp.msb_right) 979 return -EINVAL; 980 } 981 982 if (!info->fbops->fb_check_var) { 983 *var = info->var; 984 goto done; 985 } 986 987 ret = info->fbops->fb_check_var(var, info); 988 989 if (ret) 990 goto done; 991 992 if ((var->activate & FB_ACTIVATE_MASK) == FB_ACTIVATE_NOW) { 993 struct fb_var_screeninfo old_var; 994 struct fb_videomode mode; 995 996 if (info->fbops->fb_get_caps) { 997 ret = fb_check_caps(info, var, activate); 998 999 if (ret) 1000 goto done; 1001 } 1002 1003 old_var = info->var; 1004 info->var = *var; 1005 1006 if (info->fbops->fb_set_par) { 1007 ret = info->fbops->fb_set_par(info); 1008 1009 if (ret) { 1010 info->var = old_var; 1011 printk(KERN_WARNING "detected " 1012 "fb_set_par error, " 1013 "error code: %d\n", ret); 1014 goto done; 1015 } 1016 } 1017 1018 fb_pan_display(info, &info->var); 1019 fb_set_cmap(&info->cmap, info); 1020 fb_var_to_videomode(&mode, &info->var); 1021 1022 if (info->modelist.prev && info->modelist.next && 1023 !list_empty(&info->modelist)) 1024 ret = fb_add_videomode(&mode, &info->modelist); 1025 1026 if (!ret && (flags & FBINFO_MISC_USEREVENT)) { 1027 struct fb_event event; 1028 int evnt = (activate & FB_ACTIVATE_ALL) ? 1029 FB_EVENT_MODE_CHANGE_ALL : 1030 FB_EVENT_MODE_CHANGE; 1031 1032 info->flags &= ~FBINFO_MISC_USEREVENT; 1033 event.info = info; 1034 event.data = &mode; 1035 fb_notifier_call_chain(evnt, &event); 1036 } 1037 } 1038 } 1039 1040 done: 1041 return ret; 1042 } 1043 EXPORT_SYMBOL(fb_set_var); 1044 1045 int 1046 fb_blank(struct fb_info *info, int blank) 1047 { 1048 struct fb_event event; 1049 int ret = -EINVAL, early_ret; 1050 1051 if (blank > FB_BLANK_POWERDOWN) 1052 blank = FB_BLANK_POWERDOWN; 1053 1054 event.info = info; 1055 event.data = ␣ 1056 1057 early_ret = fb_notifier_call_chain(FB_EARLY_EVENT_BLANK, &event); 1058 1059 if (info->fbops->fb_blank) 1060 ret = info->fbops->fb_blank(blank, info); 1061 1062 if (!ret) 1063 fb_notifier_call_chain(FB_EVENT_BLANK, &event); 1064 else { 1065 /* 1066 * if fb_blank is failed then revert effects of 1067 * the early blank event. 1068 */ 1069 if (!early_ret) 1070 fb_notifier_call_chain(FB_R_EARLY_EVENT_BLANK, &event); 1071 } 1072 1073 return ret; 1074 } 1075 EXPORT_SYMBOL(fb_blank); 1076 1077 static long do_fb_ioctl(struct fb_info *info, unsigned int cmd, 1078 unsigned long arg) 1079 { 1080 struct fb_ops *fb; 1081 struct fb_var_screeninfo var; 1082 struct fb_fix_screeninfo fix; 1083 struct fb_con2fbmap con2fb; 1084 struct fb_cmap cmap_from; 1085 struct fb_cmap_user cmap; 1086 struct fb_event event; 1087 void __user *argp = (void __user *)arg; 1088 long ret = 0; 1089 1090 switch (cmd) { 1091 case FBIOGET_VSCREENINFO: 1092 if (!lock_fb_info(info)) 1093 return -ENODEV; 1094 var = info->var; 1095 unlock_fb_info(info); 1096 1097 ret = copy_to_user(argp, &var, sizeof(var)) ? -EFAULT : 0; 1098 break; 1099 case FBIOPUT_VSCREENINFO: 1100 if (copy_from_user(&var, argp, sizeof(var))) 1101 return -EFAULT; 1102 console_lock(); 1103 if (!lock_fb_info(info)) { 1104 console_unlock(); 1105 return -ENODEV; 1106 } 1107 info->flags |= FBINFO_MISC_USEREVENT; 1108 ret = fb_set_var(info, &var); 1109 info->flags &= ~FBINFO_MISC_USEREVENT; 1110 unlock_fb_info(info); 1111 console_unlock(); 1112 if (!ret && copy_to_user(argp, &var, sizeof(var))) 1113 ret = -EFAULT; 1114 break; 1115 case FBIOGET_FSCREENINFO: 1116 if (!lock_fb_info(info)) 1117 return -ENODEV; 1118 fix = info->fix; 1119 unlock_fb_info(info); 1120 1121 ret = copy_to_user(argp, &fix, sizeof(fix)) ? -EFAULT : 0; 1122 break; 1123 case FBIOPUTCMAP: 1124 if (copy_from_user(&cmap, argp, sizeof(cmap))) 1125 return -EFAULT; 1126 ret = fb_set_user_cmap(&cmap, info); 1127 break; 1128 case FBIOGETCMAP: 1129 if (copy_from_user(&cmap, argp, sizeof(cmap))) 1130 return -EFAULT; 1131 if (!lock_fb_info(info)) 1132 return -ENODEV; 1133 cmap_from = info->cmap; 1134 unlock_fb_info(info); 1135 ret = fb_cmap_to_user(&cmap_from, &cmap); 1136 break; 1137 case FBIOPAN_DISPLAY: 1138 if (copy_from_user(&var, argp, sizeof(var))) 1139 return -EFAULT; 1140 console_lock(); 1141 if (!lock_fb_info(info)) { 1142 console_unlock(); 1143 return -ENODEV; 1144 } 1145 ret = fb_pan_display(info, &var); 1146 unlock_fb_info(info); 1147 console_unlock(); 1148 if (ret == 0 && copy_to_user(argp, &var, sizeof(var))) 1149 return -EFAULT; 1150 break; 1151 case FBIO_CURSOR: 1152 ret = -EINVAL; 1153 break; 1154 case FBIOGET_CON2FBMAP: 1155 if (copy_from_user(&con2fb, argp, sizeof(con2fb))) 1156 return -EFAULT; 1157 if (con2fb.console < 1 || con2fb.console > MAX_NR_CONSOLES) 1158 return -EINVAL; 1159 con2fb.framebuffer = -1; 1160 event.data = &con2fb; 1161 if (!lock_fb_info(info)) 1162 return -ENODEV; 1163 event.info = info; 1164 fb_notifier_call_chain(FB_EVENT_GET_CONSOLE_MAP, &event); 1165 unlock_fb_info(info); 1166 ret = copy_to_user(argp, &con2fb, sizeof(con2fb)) ? -EFAULT : 0; 1167 break; 1168 case FBIOPUT_CON2FBMAP: 1169 if (copy_from_user(&con2fb, argp, sizeof(con2fb))) 1170 return -EFAULT; 1171 if (con2fb.console < 1 || con2fb.console > MAX_NR_CONSOLES) 1172 return -EINVAL; 1173 if (con2fb.framebuffer >= FB_MAX) 1174 return -EINVAL; 1175 if (!registered_fb[con2fb.framebuffer]) 1176 request_module("fb%d", con2fb.framebuffer); 1177 if (!registered_fb[con2fb.framebuffer]) { 1178 ret = -EINVAL; 1179 break; 1180 } 1181 event.data = &con2fb; 1182 console_lock(); 1183 if (!lock_fb_info(info)) { 1184 console_unlock(); 1185 return -ENODEV; 1186 } 1187 event.info = info; 1188 ret = fb_notifier_call_chain(FB_EVENT_SET_CONSOLE_MAP, &event); 1189 unlock_fb_info(info); 1190 console_unlock(); 1191 break; 1192 case FBIOBLANK: 1193 console_lock(); 1194 if (!lock_fb_info(info)) { 1195 console_unlock(); 1196 return -ENODEV; 1197 } 1198 info->flags |= FBINFO_MISC_USEREVENT; 1199 ret = fb_blank(info, arg); 1200 info->flags &= ~FBINFO_MISC_USEREVENT; 1201 unlock_fb_info(info); 1202 console_unlock(); 1203 break; 1204 default: 1205 if (!lock_fb_info(info)) 1206 return -ENODEV; 1207 fb = info->fbops; 1208 if (fb->fb_ioctl) 1209 ret = fb->fb_ioctl(info, cmd, arg); 1210 else 1211 ret = -ENOTTY; 1212 unlock_fb_info(info); 1213 } 1214 return ret; 1215 } 1216 1217 static long fb_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 1218 { 1219 struct fb_info *info = file_fb_info(file); 1220 1221 if (!info) 1222 return -ENODEV; 1223 return do_fb_ioctl(info, cmd, arg); 1224 } 1225 1226 #ifdef CONFIG_COMPAT 1227 struct fb_fix_screeninfo32 { 1228 char id[16]; 1229 compat_caddr_t smem_start; 1230 u32 smem_len; 1231 u32 type; 1232 u32 type_aux; 1233 u32 visual; 1234 u16 xpanstep; 1235 u16 ypanstep; 1236 u16 ywrapstep; 1237 u32 line_length; 1238 compat_caddr_t mmio_start; 1239 u32 mmio_len; 1240 u32 accel; 1241 u16 reserved[3]; 1242 }; 1243 1244 struct fb_cmap32 { 1245 u32 start; 1246 u32 len; 1247 compat_caddr_t red; 1248 compat_caddr_t green; 1249 compat_caddr_t blue; 1250 compat_caddr_t transp; 1251 }; 1252 1253 static int fb_getput_cmap(struct fb_info *info, unsigned int cmd, 1254 unsigned long arg) 1255 { 1256 struct fb_cmap_user __user *cmap; 1257 struct fb_cmap32 __user *cmap32; 1258 __u32 data; 1259 int err; 1260 1261 cmap = compat_alloc_user_space(sizeof(*cmap)); 1262 cmap32 = compat_ptr(arg); 1263 1264 if (copy_in_user(&cmap->start, &cmap32->start, 2 * sizeof(__u32))) 1265 return -EFAULT; 1266 1267 if (get_user(data, &cmap32->red) || 1268 put_user(compat_ptr(data), &cmap->red) || 1269 get_user(data, &cmap32->green) || 1270 put_user(compat_ptr(data), &cmap->green) || 1271 get_user(data, &cmap32->blue) || 1272 put_user(compat_ptr(data), &cmap->blue) || 1273 get_user(data, &cmap32->transp) || 1274 put_user(compat_ptr(data), &cmap->transp)) 1275 return -EFAULT; 1276 1277 err = do_fb_ioctl(info, cmd, (unsigned long) cmap); 1278 1279 if (!err) { 1280 if (copy_in_user(&cmap32->start, 1281 &cmap->start, 1282 2 * sizeof(__u32))) 1283 err = -EFAULT; 1284 } 1285 return err; 1286 } 1287 1288 static int do_fscreeninfo_to_user(struct fb_fix_screeninfo *fix, 1289 struct fb_fix_screeninfo32 __user *fix32) 1290 { 1291 __u32 data; 1292 int err; 1293 1294 err = copy_to_user(&fix32->id, &fix->id, sizeof(fix32->id)); 1295 1296 data = (__u32) (unsigned long) fix->smem_start; 1297 err |= put_user(data, &fix32->smem_start); 1298 1299 err |= put_user(fix->smem_len, &fix32->smem_len); 1300 err |= put_user(fix->type, &fix32->type); 1301 err |= put_user(fix->type_aux, &fix32->type_aux); 1302 err |= put_user(fix->visual, &fix32->visual); 1303 err |= put_user(fix->xpanstep, &fix32->xpanstep); 1304 err |= put_user(fix->ypanstep, &fix32->ypanstep); 1305 err |= put_user(fix->ywrapstep, &fix32->ywrapstep); 1306 err |= put_user(fix->line_length, &fix32->line_length); 1307 1308 data = (__u32) (unsigned long) fix->mmio_start; 1309 err |= put_user(data, &fix32->mmio_start); 1310 1311 err |= put_user(fix->mmio_len, &fix32->mmio_len); 1312 err |= put_user(fix->accel, &fix32->accel); 1313 err |= copy_to_user(fix32->reserved, fix->reserved, 1314 sizeof(fix->reserved)); 1315 1316 if (err) 1317 return -EFAULT; 1318 return 0; 1319 } 1320 1321 static int fb_get_fscreeninfo(struct fb_info *info, unsigned int cmd, 1322 unsigned long arg) 1323 { 1324 struct fb_fix_screeninfo fix; 1325 1326 if (!lock_fb_info(info)) 1327 return -ENODEV; 1328 fix = info->fix; 1329 unlock_fb_info(info); 1330 return do_fscreeninfo_to_user(&fix, compat_ptr(arg)); 1331 } 1332 1333 static long fb_compat_ioctl(struct file *file, unsigned int cmd, 1334 unsigned long arg) 1335 { 1336 struct fb_info *info = file_fb_info(file); 1337 struct fb_ops *fb; 1338 long ret = -ENOIOCTLCMD; 1339 1340 if (!info) 1341 return -ENODEV; 1342 fb = info->fbops; 1343 switch(cmd) { 1344 case FBIOGET_VSCREENINFO: 1345 case FBIOPUT_VSCREENINFO: 1346 case FBIOPAN_DISPLAY: 1347 case FBIOGET_CON2FBMAP: 1348 case FBIOPUT_CON2FBMAP: 1349 arg = (unsigned long) compat_ptr(arg); 1350 /* fall through */ 1351 case FBIOBLANK: 1352 ret = do_fb_ioctl(info, cmd, arg); 1353 break; 1354 1355 case FBIOGET_FSCREENINFO: 1356 ret = fb_get_fscreeninfo(info, cmd, arg); 1357 break; 1358 1359 case FBIOGETCMAP: 1360 case FBIOPUTCMAP: 1361 ret = fb_getput_cmap(info, cmd, arg); 1362 break; 1363 1364 default: 1365 if (fb->fb_compat_ioctl) 1366 ret = fb->fb_compat_ioctl(info, cmd, arg); 1367 break; 1368 } 1369 return ret; 1370 } 1371 #endif 1372 1373 static int 1374 fb_mmap(struct file *file, struct vm_area_struct * vma) 1375 { 1376 struct fb_info *info = file_fb_info(file); 1377 struct fb_ops *fb; 1378 unsigned long mmio_pgoff; 1379 unsigned long start; 1380 u32 len; 1381 1382 if (!info) 1383 return -ENODEV; 1384 fb = info->fbops; 1385 if (!fb) 1386 return -ENODEV; 1387 mutex_lock(&info->mm_lock); 1388 if (fb->fb_mmap) { 1389 int res; 1390 1391 /* 1392 * The framebuffer needs to be accessed decrypted, be sure 1393 * SME protection is removed ahead of the call 1394 */ 1395 vma->vm_page_prot = pgprot_decrypted(vma->vm_page_prot); 1396 res = fb->fb_mmap(info, vma); 1397 mutex_unlock(&info->mm_lock); 1398 return res; 1399 } 1400 1401 /* 1402 * Ugh. This can be either the frame buffer mapping, or 1403 * if pgoff points past it, the mmio mapping. 1404 */ 1405 start = info->fix.smem_start; 1406 len = info->fix.smem_len; 1407 mmio_pgoff = PAGE_ALIGN((start & ~PAGE_MASK) + len) >> PAGE_SHIFT; 1408 if (vma->vm_pgoff >= mmio_pgoff) { 1409 if (info->var.accel_flags) { 1410 mutex_unlock(&info->mm_lock); 1411 return -EINVAL; 1412 } 1413 1414 vma->vm_pgoff -= mmio_pgoff; 1415 start = info->fix.mmio_start; 1416 len = info->fix.mmio_len; 1417 } 1418 mutex_unlock(&info->mm_lock); 1419 1420 vma->vm_page_prot = vm_get_page_prot(vma->vm_flags); 1421 /* 1422 * The framebuffer needs to be accessed decrypted, be sure 1423 * SME protection is removed 1424 */ 1425 vma->vm_page_prot = pgprot_decrypted(vma->vm_page_prot); 1426 fb_pgprotect(file, vma, start); 1427 1428 return vm_iomap_memory(vma, start, len); 1429 } 1430 1431 static int 1432 fb_open(struct inode *inode, struct file *file) 1433 __acquires(&info->lock) 1434 __releases(&info->lock) 1435 { 1436 int fbidx = iminor(inode); 1437 struct fb_info *info; 1438 int res = 0; 1439 1440 info = get_fb_info(fbidx); 1441 if (!info) { 1442 request_module("fb%d", fbidx); 1443 info = get_fb_info(fbidx); 1444 if (!info) 1445 return -ENODEV; 1446 } 1447 if (IS_ERR(info)) 1448 return PTR_ERR(info); 1449 1450 mutex_lock(&info->lock); 1451 if (!try_module_get(info->fbops->owner)) { 1452 res = -ENODEV; 1453 goto out; 1454 } 1455 file->private_data = info; 1456 if (info->fbops->fb_open) { 1457 res = info->fbops->fb_open(info,1); 1458 if (res) 1459 module_put(info->fbops->owner); 1460 } 1461 #ifdef CONFIG_FB_DEFERRED_IO 1462 if (info->fbdefio) 1463 fb_deferred_io_open(info, inode, file); 1464 #endif 1465 out: 1466 mutex_unlock(&info->lock); 1467 if (res) 1468 put_fb_info(info); 1469 return res; 1470 } 1471 1472 static int 1473 fb_release(struct inode *inode, struct file *file) 1474 __acquires(&info->lock) 1475 __releases(&info->lock) 1476 { 1477 struct fb_info * const info = file->private_data; 1478 1479 mutex_lock(&info->lock); 1480 if (info->fbops->fb_release) 1481 info->fbops->fb_release(info,1); 1482 module_put(info->fbops->owner); 1483 mutex_unlock(&info->lock); 1484 put_fb_info(info); 1485 return 0; 1486 } 1487 1488 #if defined(CONFIG_FB_PROVIDE_GET_FB_UNMAPPED_AREA) && !defined(CONFIG_MMU) 1489 unsigned long get_fb_unmapped_area(struct file *filp, 1490 unsigned long addr, unsigned long len, 1491 unsigned long pgoff, unsigned long flags) 1492 { 1493 struct fb_info * const info = filp->private_data; 1494 unsigned long fb_size = PAGE_ALIGN(info->fix.smem_len); 1495 1496 if (pgoff > fb_size || len > fb_size - pgoff) 1497 return -EINVAL; 1498 1499 return (unsigned long)info->screen_base + pgoff; 1500 } 1501 #endif 1502 1503 static const struct file_operations fb_fops = { 1504 .owner = THIS_MODULE, 1505 .read = fb_read, 1506 .write = fb_write, 1507 .unlocked_ioctl = fb_ioctl, 1508 #ifdef CONFIG_COMPAT 1509 .compat_ioctl = fb_compat_ioctl, 1510 #endif 1511 .mmap = fb_mmap, 1512 .open = fb_open, 1513 .release = fb_release, 1514 #if defined(HAVE_ARCH_FB_UNMAPPED_AREA) || \ 1515 (defined(CONFIG_FB_PROVIDE_GET_FB_UNMAPPED_AREA) && \ 1516 !defined(CONFIG_MMU)) 1517 .get_unmapped_area = get_fb_unmapped_area, 1518 #endif 1519 #ifdef CONFIG_FB_DEFERRED_IO 1520 .fsync = fb_deferred_io_fsync, 1521 #endif 1522 .llseek = default_llseek, 1523 }; 1524 1525 struct class *fb_class; 1526 EXPORT_SYMBOL(fb_class); 1527 1528 static int fb_check_foreignness(struct fb_info *fi) 1529 { 1530 const bool foreign_endian = fi->flags & FBINFO_FOREIGN_ENDIAN; 1531 1532 fi->flags &= ~FBINFO_FOREIGN_ENDIAN; 1533 1534 #ifdef __BIG_ENDIAN 1535 fi->flags |= foreign_endian ? 0 : FBINFO_BE_MATH; 1536 #else 1537 fi->flags |= foreign_endian ? FBINFO_BE_MATH : 0; 1538 #endif /* __BIG_ENDIAN */ 1539 1540 if (fi->flags & FBINFO_BE_MATH && !fb_be_math(fi)) { 1541 pr_err("%s: enable CONFIG_FB_BIG_ENDIAN to " 1542 "support this framebuffer\n", fi->fix.id); 1543 return -ENOSYS; 1544 } else if (!(fi->flags & FBINFO_BE_MATH) && fb_be_math(fi)) { 1545 pr_err("%s: enable CONFIG_FB_LITTLE_ENDIAN to " 1546 "support this framebuffer\n", fi->fix.id); 1547 return -ENOSYS; 1548 } 1549 1550 return 0; 1551 } 1552 1553 static bool apertures_overlap(struct aperture *gen, struct aperture *hw) 1554 { 1555 /* is the generic aperture base the same as the HW one */ 1556 if (gen->base == hw->base) 1557 return true; 1558 /* is the generic aperture base inside the hw base->hw base+size */ 1559 if (gen->base > hw->base && gen->base < hw->base + hw->size) 1560 return true; 1561 return false; 1562 } 1563 1564 static bool fb_do_apertures_overlap(struct apertures_struct *gena, 1565 struct apertures_struct *hwa) 1566 { 1567 int i, j; 1568 if (!hwa || !gena) 1569 return false; 1570 1571 for (i = 0; i < hwa->count; ++i) { 1572 struct aperture *h = &hwa->ranges[i]; 1573 for (j = 0; j < gena->count; ++j) { 1574 struct aperture *g = &gena->ranges[j]; 1575 printk(KERN_DEBUG "checking generic (%llx %llx) vs hw (%llx %llx)\n", 1576 (unsigned long long)g->base, 1577 (unsigned long long)g->size, 1578 (unsigned long long)h->base, 1579 (unsigned long long)h->size); 1580 if (apertures_overlap(g, h)) 1581 return true; 1582 } 1583 } 1584 1585 return false; 1586 } 1587 1588 static int do_unregister_framebuffer(struct fb_info *fb_info); 1589 1590 #define VGA_FB_PHYS 0xA0000 1591 static int do_remove_conflicting_framebuffers(struct apertures_struct *a, 1592 const char *name, bool primary) 1593 { 1594 int i, ret; 1595 1596 /* check all firmware fbs and kick off if the base addr overlaps */ 1597 for_each_registered_fb(i) { 1598 struct apertures_struct *gen_aper; 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 else 1694 atomic_inc(&ignore_console_lock_warning); 1695 if (!lock_fb_info(fb_info)) { 1696 ret = -ENODEV; 1697 goto unlock_console; 1698 } 1699 ret = 0; 1700 1701 fb_notifier_call_chain(FB_EVENT_FB_REGISTERED, &event); 1702 unlock_fb_info(fb_info); 1703 unlock_console: 1704 if (!lockless_register_fb) 1705 console_unlock(); 1706 else 1707 atomic_dec(&ignore_console_lock_warning); 1708 return ret; 1709 } 1710 1711 static int unbind_console(struct fb_info *fb_info) 1712 { 1713 struct fb_event event; 1714 int ret; 1715 int i = fb_info->node; 1716 1717 if (i < 0 || i >= FB_MAX || registered_fb[i] != fb_info) 1718 return -EINVAL; 1719 1720 console_lock(); 1721 if (!lock_fb_info(fb_info)) { 1722 console_unlock(); 1723 return -ENODEV; 1724 } 1725 1726 event.info = fb_info; 1727 ret = fb_notifier_call_chain(FB_EVENT_FB_UNBIND, &event); 1728 unlock_fb_info(fb_info); 1729 console_unlock(); 1730 1731 return ret; 1732 } 1733 1734 static int __unlink_framebuffer(struct fb_info *fb_info); 1735 1736 static int do_unregister_framebuffer(struct fb_info *fb_info) 1737 { 1738 struct fb_event event; 1739 int ret; 1740 1741 ret = unbind_console(fb_info); 1742 1743 if (ret) 1744 return -EINVAL; 1745 1746 pm_vt_switch_unregister(fb_info->dev); 1747 1748 __unlink_framebuffer(fb_info); 1749 if (fb_info->pixmap.addr && 1750 (fb_info->pixmap.flags & FB_PIXMAP_DEFAULT)) 1751 kfree(fb_info->pixmap.addr); 1752 fb_destroy_modelist(&fb_info->modelist); 1753 registered_fb[fb_info->node] = NULL; 1754 num_registered_fb--; 1755 fb_cleanup_device(fb_info); 1756 event.info = fb_info; 1757 console_lock(); 1758 fb_notifier_call_chain(FB_EVENT_FB_UNREGISTERED, &event); 1759 console_unlock(); 1760 1761 /* this may free fb info */ 1762 put_fb_info(fb_info); 1763 return 0; 1764 } 1765 1766 static int __unlink_framebuffer(struct fb_info *fb_info) 1767 { 1768 int i; 1769 1770 i = fb_info->node; 1771 if (i < 0 || i >= FB_MAX || registered_fb[i] != fb_info) 1772 return -EINVAL; 1773 1774 if (fb_info->dev) { 1775 device_destroy(fb_class, MKDEV(FB_MAJOR, i)); 1776 fb_info->dev = NULL; 1777 } 1778 1779 return 0; 1780 } 1781 1782 int unlink_framebuffer(struct fb_info *fb_info) 1783 { 1784 int ret; 1785 1786 ret = __unlink_framebuffer(fb_info); 1787 if (ret) 1788 return ret; 1789 1790 unbind_console(fb_info); 1791 1792 return 0; 1793 } 1794 EXPORT_SYMBOL(unlink_framebuffer); 1795 1796 int remove_conflicting_framebuffers(struct apertures_struct *a, 1797 const char *name, bool primary) 1798 { 1799 int ret; 1800 1801 mutex_lock(®istration_lock); 1802 ret = do_remove_conflicting_framebuffers(a, name, primary); 1803 mutex_unlock(®istration_lock); 1804 1805 return ret; 1806 } 1807 EXPORT_SYMBOL(remove_conflicting_framebuffers); 1808 1809 /** 1810 * register_framebuffer - registers a frame buffer device 1811 * @fb_info: frame buffer info structure 1812 * 1813 * Registers a frame buffer device @fb_info. 1814 * 1815 * Returns negative errno on error, or zero for success. 1816 * 1817 */ 1818 int 1819 register_framebuffer(struct fb_info *fb_info) 1820 { 1821 int ret; 1822 1823 mutex_lock(®istration_lock); 1824 ret = do_register_framebuffer(fb_info); 1825 mutex_unlock(®istration_lock); 1826 1827 return ret; 1828 } 1829 EXPORT_SYMBOL(register_framebuffer); 1830 1831 /** 1832 * unregister_framebuffer - releases a frame buffer device 1833 * @fb_info: frame buffer info structure 1834 * 1835 * Unregisters a frame buffer device @fb_info. 1836 * 1837 * Returns negative errno on error, or zero for success. 1838 * 1839 * This function will also notify the framebuffer console 1840 * to release the driver. 1841 * 1842 * This is meant to be called within a driver's module_exit() 1843 * function. If this is called outside module_exit(), ensure 1844 * that the driver implements fb_open() and fb_release() to 1845 * check that no processes are using the device. 1846 */ 1847 int 1848 unregister_framebuffer(struct fb_info *fb_info) 1849 { 1850 int ret; 1851 1852 mutex_lock(®istration_lock); 1853 ret = do_unregister_framebuffer(fb_info); 1854 mutex_unlock(®istration_lock); 1855 1856 return ret; 1857 } 1858 EXPORT_SYMBOL(unregister_framebuffer); 1859 1860 /** 1861 * fb_set_suspend - low level driver signals suspend 1862 * @info: framebuffer affected 1863 * @state: 0 = resuming, !=0 = suspending 1864 * 1865 * This is meant to be used by low level drivers to 1866 * signal suspend/resume to the core & clients. 1867 * It must be called with the console semaphore held 1868 */ 1869 void fb_set_suspend(struct fb_info *info, int state) 1870 { 1871 struct fb_event event; 1872 1873 event.info = info; 1874 if (state) { 1875 fb_notifier_call_chain(FB_EVENT_SUSPEND, &event); 1876 info->state = FBINFO_STATE_SUSPENDED; 1877 } else { 1878 info->state = FBINFO_STATE_RUNNING; 1879 fb_notifier_call_chain(FB_EVENT_RESUME, &event); 1880 } 1881 } 1882 EXPORT_SYMBOL(fb_set_suspend); 1883 1884 /** 1885 * fbmem_init - init frame buffer subsystem 1886 * 1887 * Initialize the frame buffer subsystem. 1888 * 1889 * NOTE: This function is _only_ to be called by drivers/char/mem.c. 1890 * 1891 */ 1892 1893 static int __init 1894 fbmem_init(void) 1895 { 1896 int ret; 1897 1898 if (!proc_create_seq("fb", 0, NULL, &proc_fb_seq_ops)) 1899 return -ENOMEM; 1900 1901 ret = register_chrdev(FB_MAJOR, "fb", &fb_fops); 1902 if (ret) { 1903 printk("unable to get major %d for fb devs\n", FB_MAJOR); 1904 goto err_chrdev; 1905 } 1906 1907 fb_class = class_create(THIS_MODULE, "graphics"); 1908 if (IS_ERR(fb_class)) { 1909 ret = PTR_ERR(fb_class); 1910 pr_warn("Unable to create fb class; errno = %d\n", ret); 1911 fb_class = NULL; 1912 goto err_class; 1913 } 1914 1915 fb_console_init(); 1916 1917 return 0; 1918 1919 err_class: 1920 unregister_chrdev(FB_MAJOR, "fb"); 1921 err_chrdev: 1922 remove_proc_entry("fb", NULL); 1923 return ret; 1924 } 1925 1926 #ifdef MODULE 1927 module_init(fbmem_init); 1928 static void __exit 1929 fbmem_exit(void) 1930 { 1931 fb_console_exit(); 1932 1933 remove_proc_entry("fb", NULL); 1934 class_destroy(fb_class); 1935 unregister_chrdev(FB_MAJOR, "fb"); 1936 } 1937 1938 module_exit(fbmem_exit); 1939 MODULE_LICENSE("GPL"); 1940 MODULE_DESCRIPTION("Framebuffer base"); 1941 #else 1942 subsys_initcall(fbmem_init); 1943 #endif 1944 1945 int fb_new_modelist(struct fb_info *info) 1946 { 1947 struct fb_event event; 1948 struct fb_var_screeninfo var = info->var; 1949 struct list_head *pos, *n; 1950 struct fb_modelist *modelist; 1951 struct fb_videomode *m, mode; 1952 int err = 1; 1953 1954 list_for_each_safe(pos, n, &info->modelist) { 1955 modelist = list_entry(pos, struct fb_modelist, list); 1956 m = &modelist->mode; 1957 fb_videomode_to_var(&var, m); 1958 var.activate = FB_ACTIVATE_TEST; 1959 err = fb_set_var(info, &var); 1960 fb_var_to_videomode(&mode, &var); 1961 if (err || !fb_mode_is_equal(m, &mode)) { 1962 list_del(pos); 1963 kfree(pos); 1964 } 1965 } 1966 1967 err = 1; 1968 1969 if (!list_empty(&info->modelist)) { 1970 event.info = info; 1971 err = fb_notifier_call_chain(FB_EVENT_NEW_MODELIST, &event); 1972 } 1973 1974 return err; 1975 } 1976 1977 MODULE_LICENSE("GPL"); 1978