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 case FBIOBLANK: 1351 ret = do_fb_ioctl(info, cmd, arg); 1352 break; 1353 1354 case FBIOGET_FSCREENINFO: 1355 ret = fb_get_fscreeninfo(info, cmd, arg); 1356 break; 1357 1358 case FBIOGETCMAP: 1359 case FBIOPUTCMAP: 1360 ret = fb_getput_cmap(info, cmd, arg); 1361 break; 1362 1363 default: 1364 if (fb->fb_compat_ioctl) 1365 ret = fb->fb_compat_ioctl(info, cmd, arg); 1366 break; 1367 } 1368 return ret; 1369 } 1370 #endif 1371 1372 static int 1373 fb_mmap(struct file *file, struct vm_area_struct * vma) 1374 { 1375 struct fb_info *info = file_fb_info(file); 1376 struct fb_ops *fb; 1377 unsigned long mmio_pgoff; 1378 unsigned long start; 1379 u32 len; 1380 1381 if (!info) 1382 return -ENODEV; 1383 fb = info->fbops; 1384 if (!fb) 1385 return -ENODEV; 1386 mutex_lock(&info->mm_lock); 1387 if (fb->fb_mmap) { 1388 int res; 1389 1390 /* 1391 * The framebuffer needs to be accessed decrypted, be sure 1392 * SME protection is removed ahead of the call 1393 */ 1394 vma->vm_page_prot = pgprot_decrypted(vma->vm_page_prot); 1395 res = fb->fb_mmap(info, vma); 1396 mutex_unlock(&info->mm_lock); 1397 return res; 1398 } 1399 1400 /* 1401 * Ugh. This can be either the frame buffer mapping, or 1402 * if pgoff points past it, the mmio mapping. 1403 */ 1404 start = info->fix.smem_start; 1405 len = info->fix.smem_len; 1406 mmio_pgoff = PAGE_ALIGN((start & ~PAGE_MASK) + len) >> PAGE_SHIFT; 1407 if (vma->vm_pgoff >= mmio_pgoff) { 1408 if (info->var.accel_flags) { 1409 mutex_unlock(&info->mm_lock); 1410 return -EINVAL; 1411 } 1412 1413 vma->vm_pgoff -= mmio_pgoff; 1414 start = info->fix.mmio_start; 1415 len = info->fix.mmio_len; 1416 } 1417 mutex_unlock(&info->mm_lock); 1418 1419 vma->vm_page_prot = vm_get_page_prot(vma->vm_flags); 1420 /* 1421 * The framebuffer needs to be accessed decrypted, be sure 1422 * SME protection is removed 1423 */ 1424 vma->vm_page_prot = pgprot_decrypted(vma->vm_page_prot); 1425 fb_pgprotect(file, vma, start); 1426 1427 return vm_iomap_memory(vma, start, len); 1428 } 1429 1430 static int 1431 fb_open(struct inode *inode, struct file *file) 1432 __acquires(&info->lock) 1433 __releases(&info->lock) 1434 { 1435 int fbidx = iminor(inode); 1436 struct fb_info *info; 1437 int res = 0; 1438 1439 info = get_fb_info(fbidx); 1440 if (!info) { 1441 request_module("fb%d", fbidx); 1442 info = get_fb_info(fbidx); 1443 if (!info) 1444 return -ENODEV; 1445 } 1446 if (IS_ERR(info)) 1447 return PTR_ERR(info); 1448 1449 mutex_lock(&info->lock); 1450 if (!try_module_get(info->fbops->owner)) { 1451 res = -ENODEV; 1452 goto out; 1453 } 1454 file->private_data = info; 1455 if (info->fbops->fb_open) { 1456 res = info->fbops->fb_open(info,1); 1457 if (res) 1458 module_put(info->fbops->owner); 1459 } 1460 #ifdef CONFIG_FB_DEFERRED_IO 1461 if (info->fbdefio) 1462 fb_deferred_io_open(info, inode, file); 1463 #endif 1464 out: 1465 mutex_unlock(&info->lock); 1466 if (res) 1467 put_fb_info(info); 1468 return res; 1469 } 1470 1471 static int 1472 fb_release(struct inode *inode, struct file *file) 1473 __acquires(&info->lock) 1474 __releases(&info->lock) 1475 { 1476 struct fb_info * const info = file->private_data; 1477 1478 mutex_lock(&info->lock); 1479 if (info->fbops->fb_release) 1480 info->fbops->fb_release(info,1); 1481 module_put(info->fbops->owner); 1482 mutex_unlock(&info->lock); 1483 put_fb_info(info); 1484 return 0; 1485 } 1486 1487 #if defined(CONFIG_FB_PROVIDE_GET_FB_UNMAPPED_AREA) && !defined(CONFIG_MMU) 1488 unsigned long get_fb_unmapped_area(struct file *filp, 1489 unsigned long addr, unsigned long len, 1490 unsigned long pgoff, unsigned long flags) 1491 { 1492 struct fb_info * const info = filp->private_data; 1493 unsigned long fb_size = PAGE_ALIGN(info->fix.smem_len); 1494 1495 if (pgoff > fb_size || len > fb_size - pgoff) 1496 return -EINVAL; 1497 1498 return (unsigned long)info->screen_base + pgoff; 1499 } 1500 #endif 1501 1502 static const struct file_operations fb_fops = { 1503 .owner = THIS_MODULE, 1504 .read = fb_read, 1505 .write = fb_write, 1506 .unlocked_ioctl = fb_ioctl, 1507 #ifdef CONFIG_COMPAT 1508 .compat_ioctl = fb_compat_ioctl, 1509 #endif 1510 .mmap = fb_mmap, 1511 .open = fb_open, 1512 .release = fb_release, 1513 #if defined(HAVE_ARCH_FB_UNMAPPED_AREA) || \ 1514 (defined(CONFIG_FB_PROVIDE_GET_FB_UNMAPPED_AREA) && \ 1515 !defined(CONFIG_MMU)) 1516 .get_unmapped_area = get_fb_unmapped_area, 1517 #endif 1518 #ifdef CONFIG_FB_DEFERRED_IO 1519 .fsync = fb_deferred_io_fsync, 1520 #endif 1521 .llseek = default_llseek, 1522 }; 1523 1524 struct class *fb_class; 1525 EXPORT_SYMBOL(fb_class); 1526 1527 static int fb_check_foreignness(struct fb_info *fi) 1528 { 1529 const bool foreign_endian = fi->flags & FBINFO_FOREIGN_ENDIAN; 1530 1531 fi->flags &= ~FBINFO_FOREIGN_ENDIAN; 1532 1533 #ifdef __BIG_ENDIAN 1534 fi->flags |= foreign_endian ? 0 : FBINFO_BE_MATH; 1535 #else 1536 fi->flags |= foreign_endian ? FBINFO_BE_MATH : 0; 1537 #endif /* __BIG_ENDIAN */ 1538 1539 if (fi->flags & FBINFO_BE_MATH && !fb_be_math(fi)) { 1540 pr_err("%s: enable CONFIG_FB_BIG_ENDIAN to " 1541 "support this framebuffer\n", fi->fix.id); 1542 return -ENOSYS; 1543 } else if (!(fi->flags & FBINFO_BE_MATH) && fb_be_math(fi)) { 1544 pr_err("%s: enable CONFIG_FB_LITTLE_ENDIAN to " 1545 "support this framebuffer\n", fi->fix.id); 1546 return -ENOSYS; 1547 } 1548 1549 return 0; 1550 } 1551 1552 static bool apertures_overlap(struct aperture *gen, struct aperture *hw) 1553 { 1554 /* is the generic aperture base the same as the HW one */ 1555 if (gen->base == hw->base) 1556 return true; 1557 /* is the generic aperture base inside the hw base->hw base+size */ 1558 if (gen->base > hw->base && gen->base < hw->base + hw->size) 1559 return true; 1560 return false; 1561 } 1562 1563 static bool fb_do_apertures_overlap(struct apertures_struct *gena, 1564 struct apertures_struct *hwa) 1565 { 1566 int i, j; 1567 if (!hwa || !gena) 1568 return false; 1569 1570 for (i = 0; i < hwa->count; ++i) { 1571 struct aperture *h = &hwa->ranges[i]; 1572 for (j = 0; j < gena->count; ++j) { 1573 struct aperture *g = &gena->ranges[j]; 1574 printk(KERN_DEBUG "checking generic (%llx %llx) vs hw (%llx %llx)\n", 1575 (unsigned long long)g->base, 1576 (unsigned long long)g->size, 1577 (unsigned long long)h->base, 1578 (unsigned long long)h->size); 1579 if (apertures_overlap(g, h)) 1580 return true; 1581 } 1582 } 1583 1584 return false; 1585 } 1586 1587 static int do_unregister_framebuffer(struct fb_info *fb_info); 1588 1589 #define VGA_FB_PHYS 0xA0000 1590 static int do_remove_conflicting_framebuffers(struct apertures_struct *a, 1591 const char *name, bool primary) 1592 { 1593 int i, ret; 1594 1595 /* check all firmware fbs and kick off if the base addr overlaps */ 1596 for (i = 0 ; i < FB_MAX; i++) { 1597 struct apertures_struct *gen_aper; 1598 if (!registered_fb[i]) 1599 continue; 1600 1601 if (!(registered_fb[i]->flags & FBINFO_MISC_FIRMWARE)) 1602 continue; 1603 1604 gen_aper = registered_fb[i]->apertures; 1605 if (fb_do_apertures_overlap(gen_aper, a) || 1606 (primary && gen_aper && gen_aper->count && 1607 gen_aper->ranges[0].base == VGA_FB_PHYS)) { 1608 1609 printk(KERN_INFO "fb: switching to %s from %s\n", 1610 name, registered_fb[i]->fix.id); 1611 ret = do_unregister_framebuffer(registered_fb[i]); 1612 if (ret) 1613 return ret; 1614 } 1615 } 1616 1617 return 0; 1618 } 1619 1620 static bool lockless_register_fb; 1621 module_param_named_unsafe(lockless_register_fb, lockless_register_fb, bool, 0400); 1622 MODULE_PARM_DESC(lockless_register_fb, 1623 "Lockless framebuffer registration for debugging [default=off]"); 1624 1625 static int do_register_framebuffer(struct fb_info *fb_info) 1626 { 1627 int i, ret; 1628 struct fb_event event; 1629 struct fb_videomode mode; 1630 1631 if (fb_check_foreignness(fb_info)) 1632 return -ENOSYS; 1633 1634 ret = do_remove_conflicting_framebuffers(fb_info->apertures, 1635 fb_info->fix.id, 1636 fb_is_primary_device(fb_info)); 1637 if (ret) 1638 return ret; 1639 1640 if (num_registered_fb == FB_MAX) 1641 return -ENXIO; 1642 1643 num_registered_fb++; 1644 for (i = 0 ; i < FB_MAX; i++) 1645 if (!registered_fb[i]) 1646 break; 1647 fb_info->node = i; 1648 atomic_set(&fb_info->count, 1); 1649 mutex_init(&fb_info->lock); 1650 mutex_init(&fb_info->mm_lock); 1651 1652 fb_info->dev = device_create(fb_class, fb_info->device, 1653 MKDEV(FB_MAJOR, i), NULL, "fb%d", i); 1654 if (IS_ERR(fb_info->dev)) { 1655 /* Not fatal */ 1656 printk(KERN_WARNING "Unable to create device for framebuffer %d; errno = %ld\n", i, PTR_ERR(fb_info->dev)); 1657 fb_info->dev = NULL; 1658 } else 1659 fb_init_device(fb_info); 1660 1661 if (fb_info->pixmap.addr == NULL) { 1662 fb_info->pixmap.addr = kmalloc(FBPIXMAPSIZE, GFP_KERNEL); 1663 if (fb_info->pixmap.addr) { 1664 fb_info->pixmap.size = FBPIXMAPSIZE; 1665 fb_info->pixmap.buf_align = 1; 1666 fb_info->pixmap.scan_align = 1; 1667 fb_info->pixmap.access_align = 32; 1668 fb_info->pixmap.flags = FB_PIXMAP_DEFAULT; 1669 } 1670 } 1671 fb_info->pixmap.offset = 0; 1672 1673 if (!fb_info->pixmap.blit_x) 1674 fb_info->pixmap.blit_x = ~(u32)0; 1675 1676 if (!fb_info->pixmap.blit_y) 1677 fb_info->pixmap.blit_y = ~(u32)0; 1678 1679 if (!fb_info->modelist.prev || !fb_info->modelist.next) 1680 INIT_LIST_HEAD(&fb_info->modelist); 1681 1682 if (fb_info->skip_vt_switch) 1683 pm_vt_switch_required(fb_info->dev, false); 1684 else 1685 pm_vt_switch_required(fb_info->dev, true); 1686 1687 fb_var_to_videomode(&mode, &fb_info->var); 1688 fb_add_videomode(&mode, &fb_info->modelist); 1689 registered_fb[i] = fb_info; 1690 1691 event.info = fb_info; 1692 if (!lockless_register_fb) 1693 console_lock(); 1694 if (!lock_fb_info(fb_info)) { 1695 if (!lockless_register_fb) 1696 console_unlock(); 1697 return -ENODEV; 1698 } 1699 1700 fb_notifier_call_chain(FB_EVENT_FB_REGISTERED, &event); 1701 unlock_fb_info(fb_info); 1702 if (!lockless_register_fb) 1703 console_unlock(); 1704 return 0; 1705 } 1706 1707 static int do_unregister_framebuffer(struct fb_info *fb_info) 1708 { 1709 struct fb_event event; 1710 int i, ret = 0; 1711 1712 i = fb_info->node; 1713 if (i < 0 || i >= FB_MAX || registered_fb[i] != fb_info) 1714 return -EINVAL; 1715 1716 console_lock(); 1717 if (!lock_fb_info(fb_info)) { 1718 console_unlock(); 1719 return -ENODEV; 1720 } 1721 1722 event.info = fb_info; 1723 ret = fb_notifier_call_chain(FB_EVENT_FB_UNBIND, &event); 1724 unlock_fb_info(fb_info); 1725 console_unlock(); 1726 1727 if (ret) 1728 return -EINVAL; 1729 1730 pm_vt_switch_unregister(fb_info->dev); 1731 1732 unlink_framebuffer(fb_info); 1733 if (fb_info->pixmap.addr && 1734 (fb_info->pixmap.flags & FB_PIXMAP_DEFAULT)) 1735 kfree(fb_info->pixmap.addr); 1736 fb_destroy_modelist(&fb_info->modelist); 1737 registered_fb[i] = NULL; 1738 num_registered_fb--; 1739 fb_cleanup_device(fb_info); 1740 event.info = fb_info; 1741 console_lock(); 1742 fb_notifier_call_chain(FB_EVENT_FB_UNREGISTERED, &event); 1743 console_unlock(); 1744 1745 /* this may free fb info */ 1746 put_fb_info(fb_info); 1747 return 0; 1748 } 1749 1750 int unlink_framebuffer(struct fb_info *fb_info) 1751 { 1752 int i; 1753 1754 i = fb_info->node; 1755 if (i < 0 || i >= FB_MAX || registered_fb[i] != fb_info) 1756 return -EINVAL; 1757 1758 if (fb_info->dev) { 1759 device_destroy(fb_class, MKDEV(FB_MAJOR, i)); 1760 fb_info->dev = NULL; 1761 } 1762 return 0; 1763 } 1764 EXPORT_SYMBOL(unlink_framebuffer); 1765 1766 int remove_conflicting_framebuffers(struct apertures_struct *a, 1767 const char *name, bool primary) 1768 { 1769 int ret; 1770 1771 mutex_lock(®istration_lock); 1772 ret = do_remove_conflicting_framebuffers(a, name, primary); 1773 mutex_unlock(®istration_lock); 1774 1775 return ret; 1776 } 1777 EXPORT_SYMBOL(remove_conflicting_framebuffers); 1778 1779 /** 1780 * register_framebuffer - registers a frame buffer device 1781 * @fb_info: frame buffer info structure 1782 * 1783 * Registers a frame buffer device @fb_info. 1784 * 1785 * Returns negative errno on error, or zero for success. 1786 * 1787 */ 1788 int 1789 register_framebuffer(struct fb_info *fb_info) 1790 { 1791 int ret; 1792 1793 mutex_lock(®istration_lock); 1794 ret = do_register_framebuffer(fb_info); 1795 mutex_unlock(®istration_lock); 1796 1797 return ret; 1798 } 1799 EXPORT_SYMBOL(register_framebuffer); 1800 1801 /** 1802 * unregister_framebuffer - releases a frame buffer device 1803 * @fb_info: frame buffer info structure 1804 * 1805 * Unregisters a frame buffer device @fb_info. 1806 * 1807 * Returns negative errno on error, or zero for success. 1808 * 1809 * This function will also notify the framebuffer console 1810 * to release the driver. 1811 * 1812 * This is meant to be called within a driver's module_exit() 1813 * function. If this is called outside module_exit(), ensure 1814 * that the driver implements fb_open() and fb_release() to 1815 * check that no processes are using the device. 1816 */ 1817 int 1818 unregister_framebuffer(struct fb_info *fb_info) 1819 { 1820 int ret; 1821 1822 mutex_lock(®istration_lock); 1823 ret = do_unregister_framebuffer(fb_info); 1824 mutex_unlock(®istration_lock); 1825 1826 return ret; 1827 } 1828 EXPORT_SYMBOL(unregister_framebuffer); 1829 1830 /** 1831 * fb_set_suspend - low level driver signals suspend 1832 * @info: framebuffer affected 1833 * @state: 0 = resuming, !=0 = suspending 1834 * 1835 * This is meant to be used by low level drivers to 1836 * signal suspend/resume to the core & clients. 1837 * It must be called with the console semaphore held 1838 */ 1839 void fb_set_suspend(struct fb_info *info, int state) 1840 { 1841 struct fb_event event; 1842 1843 event.info = info; 1844 if (state) { 1845 fb_notifier_call_chain(FB_EVENT_SUSPEND, &event); 1846 info->state = FBINFO_STATE_SUSPENDED; 1847 } else { 1848 info->state = FBINFO_STATE_RUNNING; 1849 fb_notifier_call_chain(FB_EVENT_RESUME, &event); 1850 } 1851 } 1852 EXPORT_SYMBOL(fb_set_suspend); 1853 1854 /** 1855 * fbmem_init - init frame buffer subsystem 1856 * 1857 * Initialize the frame buffer subsystem. 1858 * 1859 * NOTE: This function is _only_ to be called by drivers/char/mem.c. 1860 * 1861 */ 1862 1863 static int __init 1864 fbmem_init(void) 1865 { 1866 int ret; 1867 1868 if (!proc_create_seq("fb", 0, NULL, &proc_fb_seq_ops)) 1869 return -ENOMEM; 1870 1871 ret = register_chrdev(FB_MAJOR, "fb", &fb_fops); 1872 if (ret) { 1873 printk("unable to get major %d for fb devs\n", FB_MAJOR); 1874 goto err_chrdev; 1875 } 1876 1877 fb_class = class_create(THIS_MODULE, "graphics"); 1878 if (IS_ERR(fb_class)) { 1879 ret = PTR_ERR(fb_class); 1880 pr_warn("Unable to create fb class; errno = %d\n", ret); 1881 fb_class = NULL; 1882 goto err_class; 1883 } 1884 1885 fb_console_init(); 1886 1887 return 0; 1888 1889 err_class: 1890 unregister_chrdev(FB_MAJOR, "fb"); 1891 err_chrdev: 1892 remove_proc_entry("fb", NULL); 1893 return ret; 1894 } 1895 1896 #ifdef MODULE 1897 module_init(fbmem_init); 1898 static void __exit 1899 fbmem_exit(void) 1900 { 1901 fb_console_exit(); 1902 1903 remove_proc_entry("fb", NULL); 1904 class_destroy(fb_class); 1905 unregister_chrdev(FB_MAJOR, "fb"); 1906 } 1907 1908 module_exit(fbmem_exit); 1909 MODULE_LICENSE("GPL"); 1910 MODULE_DESCRIPTION("Framebuffer base"); 1911 #else 1912 subsys_initcall(fbmem_init); 1913 #endif 1914 1915 int fb_new_modelist(struct fb_info *info) 1916 { 1917 struct fb_event event; 1918 struct fb_var_screeninfo var = info->var; 1919 struct list_head *pos, *n; 1920 struct fb_modelist *modelist; 1921 struct fb_videomode *m, mode; 1922 int err = 1; 1923 1924 list_for_each_safe(pos, n, &info->modelist) { 1925 modelist = list_entry(pos, struct fb_modelist, list); 1926 m = &modelist->mode; 1927 fb_videomode_to_var(&var, m); 1928 var.activate = FB_ACTIVATE_TEST; 1929 err = fb_set_var(info, &var); 1930 fb_var_to_videomode(&mode, &var); 1931 if (err || !fb_mode_is_equal(m, &mode)) { 1932 list_del(pos); 1933 kfree(pos); 1934 } 1935 } 1936 1937 err = 1; 1938 1939 if (!list_empty(&info->modelist)) { 1940 event.info = info; 1941 err = fb_notifier_call_chain(FB_EVENT_NEW_MODELIST, &event); 1942 } 1943 1944 return err; 1945 } 1946 1947 MODULE_LICENSE("GPL"); 1948