1 /* 2 * linux/drivers/video/fbmem.c 3 * 4 * Copyright (C) 1994 Martin Schaller 5 * 6 * 2001 - Documented with DocBook 7 * - Brad Douglas <brad@neruo.com> 8 * 9 * This file is subject to the terms and conditions of the GNU General Public 10 * License. See the file COPYING in the main directory of this archive 11 * for more details. 12 */ 13 14 #include <linux/module.h> 15 16 #include <linux/compat.h> 17 #include <linux/types.h> 18 #include <linux/errno.h> 19 #include <linux/kernel.h> 20 #include <linux/major.h> 21 #include <linux/slab.h> 22 #include <linux/mm.h> 23 #include <linux/mman.h> 24 #include <linux/vt.h> 25 #include <linux/init.h> 26 #include <linux/linux_logo.h> 27 #include <linux/proc_fs.h> 28 #include <linux/seq_file.h> 29 #include <linux/console.h> 30 #include <linux/kmod.h> 31 #include <linux/err.h> 32 #include <linux/device.h> 33 #include <linux/efi.h> 34 #include <linux/fb.h> 35 #include <linux/fbcon.h> 36 #include <linux/mem_encrypt.h> 37 38 #include <asm/fb.h> 39 40 41 /* 42 * Frame buffer device initialization and setup routines 43 */ 44 45 #define FBPIXMAPSIZE (1024 * 8) 46 47 static DEFINE_MUTEX(registration_lock); 48 49 struct fb_info *registered_fb[FB_MAX] __read_mostly; 50 EXPORT_SYMBOL(registered_fb); 51 52 int num_registered_fb __read_mostly; 53 EXPORT_SYMBOL(num_registered_fb); 54 55 static struct fb_info *get_fb_info(unsigned int idx) 56 { 57 struct fb_info *fb_info; 58 59 if (idx >= FB_MAX) 60 return ERR_PTR(-ENODEV); 61 62 mutex_lock(®istration_lock); 63 fb_info = registered_fb[idx]; 64 if (fb_info) 65 atomic_inc(&fb_info->count); 66 mutex_unlock(®istration_lock); 67 68 return fb_info; 69 } 70 71 static void put_fb_info(struct fb_info *fb_info) 72 { 73 if (!atomic_dec_and_test(&fb_info->count)) 74 return; 75 if (fb_info->fbops->fb_destroy) 76 fb_info->fbops->fb_destroy(fb_info); 77 } 78 79 int lock_fb_info(struct fb_info *info) 80 { 81 mutex_lock(&info->lock); 82 if (!info->fbops) { 83 mutex_unlock(&info->lock); 84 return 0; 85 } 86 return 1; 87 } 88 EXPORT_SYMBOL(lock_fb_info); 89 90 /* 91 * Helpers 92 */ 93 94 int fb_get_color_depth(struct fb_var_screeninfo *var, 95 struct fb_fix_screeninfo *fix) 96 { 97 int depth = 0; 98 99 if (fix->visual == FB_VISUAL_MONO01 || 100 fix->visual == FB_VISUAL_MONO10) 101 depth = 1; 102 else { 103 if (var->green.length == var->blue.length && 104 var->green.length == var->red.length && 105 var->green.offset == var->blue.offset && 106 var->green.offset == var->red.offset) 107 depth = var->green.length; 108 else 109 depth = var->green.length + var->red.length + 110 var->blue.length; 111 } 112 113 return depth; 114 } 115 EXPORT_SYMBOL(fb_get_color_depth); 116 117 /* 118 * Data padding functions. 119 */ 120 void fb_pad_aligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 s_pitch, u32 height) 121 { 122 __fb_pad_aligned_buffer(dst, d_pitch, src, s_pitch, height); 123 } 124 EXPORT_SYMBOL(fb_pad_aligned_buffer); 125 126 void fb_pad_unaligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 idx, u32 height, 127 u32 shift_high, u32 shift_low, u32 mod) 128 { 129 u8 mask = (u8) (0xfff << shift_high), tmp; 130 int i, j; 131 132 for (i = height; i--; ) { 133 for (j = 0; j < idx; j++) { 134 tmp = dst[j]; 135 tmp &= mask; 136 tmp |= *src >> shift_low; 137 dst[j] = tmp; 138 tmp = *src << shift_high; 139 dst[j+1] = tmp; 140 src++; 141 } 142 tmp = dst[idx]; 143 tmp &= mask; 144 tmp |= *src >> shift_low; 145 dst[idx] = tmp; 146 if (shift_high < mod) { 147 tmp = *src << shift_high; 148 dst[idx+1] = tmp; 149 } 150 src++; 151 dst += d_pitch; 152 } 153 } 154 EXPORT_SYMBOL(fb_pad_unaligned_buffer); 155 156 /* 157 * we need to lock this section since fb_cursor 158 * may use fb_imageblit() 159 */ 160 char* fb_get_buffer_offset(struct fb_info *info, struct fb_pixmap *buf, u32 size) 161 { 162 u32 align = buf->buf_align - 1, offset; 163 char *addr = buf->addr; 164 165 /* If IO mapped, we need to sync before access, no sharing of 166 * the pixmap is done 167 */ 168 if (buf->flags & FB_PIXMAP_IO) { 169 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC)) 170 info->fbops->fb_sync(info); 171 return addr; 172 } 173 174 /* See if we fit in the remaining pixmap space */ 175 offset = buf->offset + align; 176 offset &= ~align; 177 if (offset + size > buf->size) { 178 /* We do not fit. In order to be able to re-use the buffer, 179 * we must ensure no asynchronous DMA'ing or whatever operation 180 * is in progress, we sync for that. 181 */ 182 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC)) 183 info->fbops->fb_sync(info); 184 offset = 0; 185 } 186 buf->offset = offset + size; 187 addr += offset; 188 189 return addr; 190 } 191 EXPORT_SYMBOL(fb_get_buffer_offset); 192 193 #ifdef CONFIG_LOGO 194 195 static inline unsigned safe_shift(unsigned d, int n) 196 { 197 return n < 0 ? d >> -n : d << n; 198 } 199 200 static void fb_set_logocmap(struct fb_info *info, 201 const struct linux_logo *logo) 202 { 203 struct fb_cmap palette_cmap; 204 u16 palette_green[16]; 205 u16 palette_blue[16]; 206 u16 palette_red[16]; 207 int i, j, n; 208 const unsigned char *clut = logo->clut; 209 210 palette_cmap.start = 0; 211 palette_cmap.len = 16; 212 palette_cmap.red = palette_red; 213 palette_cmap.green = palette_green; 214 palette_cmap.blue = palette_blue; 215 palette_cmap.transp = NULL; 216 217 for (i = 0; i < logo->clutsize; i += n) { 218 n = logo->clutsize - i; 219 /* palette_cmap provides space for only 16 colors at once */ 220 if (n > 16) 221 n = 16; 222 palette_cmap.start = 32 + i; 223 palette_cmap.len = n; 224 for (j = 0; j < n; ++j) { 225 palette_cmap.red[j] = clut[0] << 8 | clut[0]; 226 palette_cmap.green[j] = clut[1] << 8 | clut[1]; 227 palette_cmap.blue[j] = clut[2] << 8 | clut[2]; 228 clut += 3; 229 } 230 fb_set_cmap(&palette_cmap, info); 231 } 232 } 233 234 static void fb_set_logo_truepalette(struct fb_info *info, 235 const struct linux_logo *logo, 236 u32 *palette) 237 { 238 static const unsigned char mask[] = { 0,0x80,0xc0,0xe0,0xf0,0xf8,0xfc,0xfe,0xff }; 239 unsigned char redmask, greenmask, bluemask; 240 int redshift, greenshift, blueshift; 241 int i; 242 const unsigned char *clut = logo->clut; 243 244 /* 245 * We have to create a temporary palette since console palette is only 246 * 16 colors long. 247 */ 248 /* Bug: Doesn't obey msb_right ... (who needs that?) */ 249 redmask = mask[info->var.red.length < 8 ? info->var.red.length : 8]; 250 greenmask = mask[info->var.green.length < 8 ? info->var.green.length : 8]; 251 bluemask = mask[info->var.blue.length < 8 ? info->var.blue.length : 8]; 252 redshift = info->var.red.offset - (8 - info->var.red.length); 253 greenshift = info->var.green.offset - (8 - info->var.green.length); 254 blueshift = info->var.blue.offset - (8 - info->var.blue.length); 255 256 for ( i = 0; i < logo->clutsize; i++) { 257 palette[i+32] = (safe_shift((clut[0] & redmask), redshift) | 258 safe_shift((clut[1] & greenmask), greenshift) | 259 safe_shift((clut[2] & bluemask), blueshift)); 260 clut += 3; 261 } 262 } 263 264 static void fb_set_logo_directpalette(struct fb_info *info, 265 const struct linux_logo *logo, 266 u32 *palette) 267 { 268 int redshift, greenshift, blueshift; 269 int i; 270 271 redshift = info->var.red.offset; 272 greenshift = info->var.green.offset; 273 blueshift = info->var.blue.offset; 274 275 for (i = 32; i < 32 + logo->clutsize; i++) 276 palette[i] = i << redshift | i << greenshift | i << blueshift; 277 } 278 279 static void fb_set_logo(struct fb_info *info, 280 const struct linux_logo *logo, u8 *dst, 281 int depth) 282 { 283 int i, j, k; 284 const u8 *src = logo->data; 285 u8 xor = (info->fix.visual == FB_VISUAL_MONO01) ? 0xff : 0; 286 u8 fg = 1, d; 287 288 switch (fb_get_color_depth(&info->var, &info->fix)) { 289 case 1: 290 fg = 1; 291 break; 292 case 2: 293 fg = 3; 294 break; 295 default: 296 fg = 7; 297 break; 298 } 299 300 if (info->fix.visual == FB_VISUAL_MONO01 || 301 info->fix.visual == FB_VISUAL_MONO10) 302 fg = ~((u8) (0xfff << info->var.green.length)); 303 304 switch (depth) { 305 case 4: 306 for (i = 0; i < logo->height; i++) 307 for (j = 0; j < logo->width; src++) { 308 *dst++ = *src >> 4; 309 j++; 310 if (j < logo->width) { 311 *dst++ = *src & 0x0f; 312 j++; 313 } 314 } 315 break; 316 case 1: 317 for (i = 0; i < logo->height; i++) { 318 for (j = 0; j < logo->width; src++) { 319 d = *src ^ xor; 320 for (k = 7; k >= 0 && j < logo->width; k--) { 321 *dst++ = ((d >> k) & 1) ? fg : 0; 322 j++; 323 } 324 } 325 } 326 break; 327 } 328 } 329 330 /* 331 * Three (3) kinds of logo maps exist. linux_logo_clut224 (>16 colors), 332 * linux_logo_vga16 (16 colors) and linux_logo_mono (2 colors). Depending on 333 * the visual format and color depth of the framebuffer, the DAC, the 334 * pseudo_palette, and the logo data will be adjusted accordingly. 335 * 336 * Case 1 - linux_logo_clut224: 337 * Color exceeds the number of console colors (16), thus we set the hardware DAC 338 * using fb_set_cmap() appropriately. The "needs_cmapreset" flag will be set. 339 * 340 * For visuals that require color info from the pseudo_palette, we also construct 341 * one for temporary use. The "needs_directpalette" or "needs_truepalette" flags 342 * will be set. 343 * 344 * Case 2 - linux_logo_vga16: 345 * The number of colors just matches the console colors, thus there is no need 346 * to set the DAC or the pseudo_palette. However, the bitmap is packed, ie, 347 * each byte contains color information for two pixels (upper and lower nibble). 348 * To be consistent with fb_imageblit() usage, we therefore separate the two 349 * nibbles into separate bytes. The "depth" flag will be set to 4. 350 * 351 * Case 3 - linux_logo_mono: 352 * This is similar with Case 2. Each byte contains information for 8 pixels. 353 * We isolate each bit and expand each into a byte. The "depth" flag will 354 * be set to 1. 355 */ 356 static struct logo_data { 357 int depth; 358 int needs_directpalette; 359 int needs_truepalette; 360 int needs_cmapreset; 361 const struct linux_logo *logo; 362 } fb_logo __read_mostly; 363 364 static void fb_rotate_logo_ud(const u8 *in, u8 *out, u32 width, u32 height) 365 { 366 u32 size = width * height, i; 367 368 out += size - 1; 369 370 for (i = size; i--; ) 371 *out-- = *in++; 372 } 373 374 static void fb_rotate_logo_cw(const u8 *in, u8 *out, u32 width, u32 height) 375 { 376 int i, j, h = height - 1; 377 378 for (i = 0; i < height; i++) 379 for (j = 0; j < width; j++) 380 out[height * j + h - i] = *in++; 381 } 382 383 static void fb_rotate_logo_ccw(const u8 *in, u8 *out, u32 width, u32 height) 384 { 385 int i, j, w = width - 1; 386 387 for (i = 0; i < height; i++) 388 for (j = 0; j < width; j++) 389 out[height * (w - j) + i] = *in++; 390 } 391 392 static void fb_rotate_logo(struct fb_info *info, u8 *dst, 393 struct fb_image *image, int rotate) 394 { 395 u32 tmp; 396 397 if (rotate == FB_ROTATE_UD) { 398 fb_rotate_logo_ud(image->data, dst, image->width, 399 image->height); 400 image->dx = info->var.xres - image->width - image->dx; 401 image->dy = info->var.yres - image->height - image->dy; 402 } else if (rotate == FB_ROTATE_CW) { 403 fb_rotate_logo_cw(image->data, dst, image->width, 404 image->height); 405 tmp = image->width; 406 image->width = image->height; 407 image->height = tmp; 408 tmp = image->dy; 409 image->dy = image->dx; 410 image->dx = info->var.xres - image->width - tmp; 411 } else if (rotate == FB_ROTATE_CCW) { 412 fb_rotate_logo_ccw(image->data, dst, image->width, 413 image->height); 414 tmp = image->width; 415 image->width = image->height; 416 image->height = tmp; 417 tmp = image->dx; 418 image->dx = image->dy; 419 image->dy = info->var.yres - image->height - tmp; 420 } 421 422 image->data = dst; 423 } 424 425 static void fb_do_show_logo(struct fb_info *info, struct fb_image *image, 426 int rotate, unsigned int num) 427 { 428 unsigned int x; 429 430 if (rotate == FB_ROTATE_UR) { 431 for (x = 0; 432 x < num && image->dx + image->width <= info->var.xres; 433 x++) { 434 info->fbops->fb_imageblit(info, image); 435 image->dx += image->width + 8; 436 } 437 } else if (rotate == FB_ROTATE_UD) { 438 for (x = 0; x < num; x++) { 439 info->fbops->fb_imageblit(info, image); 440 image->dx -= image->width + 8; 441 } 442 } else if (rotate == FB_ROTATE_CW) { 443 for (x = 0; 444 x < num && image->dy + image->height <= info->var.yres; 445 x++) { 446 info->fbops->fb_imageblit(info, image); 447 image->dy += image->height + 8; 448 } 449 } else if (rotate == FB_ROTATE_CCW) { 450 for (x = 0; x < num; x++) { 451 info->fbops->fb_imageblit(info, image); 452 image->dy -= image->height + 8; 453 } 454 } 455 } 456 457 static int fb_show_logo_line(struct fb_info *info, int rotate, 458 const struct linux_logo *logo, int y, 459 unsigned int n) 460 { 461 u32 *palette = NULL, *saved_pseudo_palette = NULL; 462 unsigned char *logo_new = NULL, *logo_rotate = NULL; 463 struct fb_image image; 464 465 /* Return if the frame buffer is not mapped or suspended */ 466 if (logo == NULL || info->state != FBINFO_STATE_RUNNING || 467 info->fbops->owner) 468 return 0; 469 470 image.depth = 8; 471 image.data = logo->data; 472 473 if (fb_logo.needs_cmapreset) 474 fb_set_logocmap(info, logo); 475 476 if (fb_logo.needs_truepalette || 477 fb_logo.needs_directpalette) { 478 palette = kmalloc(256 * 4, GFP_KERNEL); 479 if (palette == NULL) 480 return 0; 481 482 if (fb_logo.needs_truepalette) 483 fb_set_logo_truepalette(info, logo, palette); 484 else 485 fb_set_logo_directpalette(info, logo, palette); 486 487 saved_pseudo_palette = info->pseudo_palette; 488 info->pseudo_palette = palette; 489 } 490 491 if (fb_logo.depth <= 4) { 492 logo_new = kmalloc(logo->width * logo->height, GFP_KERNEL); 493 if (logo_new == NULL) { 494 kfree(palette); 495 if (saved_pseudo_palette) 496 info->pseudo_palette = saved_pseudo_palette; 497 return 0; 498 } 499 image.data = logo_new; 500 fb_set_logo(info, logo, logo_new, fb_logo.depth); 501 } 502 503 image.dx = 0; 504 image.dy = y; 505 image.width = logo->width; 506 image.height = logo->height; 507 508 if (rotate) { 509 logo_rotate = kmalloc(logo->width * 510 logo->height, GFP_KERNEL); 511 if (logo_rotate) 512 fb_rotate_logo(info, logo_rotate, &image, rotate); 513 } 514 515 fb_do_show_logo(info, &image, rotate, n); 516 517 kfree(palette); 518 if (saved_pseudo_palette != NULL) 519 info->pseudo_palette = saved_pseudo_palette; 520 kfree(logo_new); 521 kfree(logo_rotate); 522 return logo->height; 523 } 524 525 526 #ifdef CONFIG_FB_LOGO_EXTRA 527 528 #define FB_LOGO_EX_NUM_MAX 10 529 static struct logo_data_extra { 530 const struct linux_logo *logo; 531 unsigned int n; 532 } fb_logo_ex[FB_LOGO_EX_NUM_MAX]; 533 static unsigned int fb_logo_ex_num; 534 535 void fb_append_extra_logo(const struct linux_logo *logo, unsigned int n) 536 { 537 if (!n || fb_logo_ex_num == FB_LOGO_EX_NUM_MAX) 538 return; 539 540 fb_logo_ex[fb_logo_ex_num].logo = logo; 541 fb_logo_ex[fb_logo_ex_num].n = n; 542 fb_logo_ex_num++; 543 } 544 545 static int fb_prepare_extra_logos(struct fb_info *info, unsigned int height, 546 unsigned int yres) 547 { 548 unsigned int i; 549 550 /* FIXME: logo_ex supports only truecolor fb. */ 551 if (info->fix.visual != FB_VISUAL_TRUECOLOR) 552 fb_logo_ex_num = 0; 553 554 for (i = 0; i < fb_logo_ex_num; i++) { 555 if (fb_logo_ex[i].logo->type != fb_logo.logo->type) { 556 fb_logo_ex[i].logo = NULL; 557 continue; 558 } 559 height += fb_logo_ex[i].logo->height; 560 if (height > yres) { 561 height -= fb_logo_ex[i].logo->height; 562 fb_logo_ex_num = i; 563 break; 564 } 565 } 566 return height; 567 } 568 569 static int fb_show_extra_logos(struct fb_info *info, int y, int rotate) 570 { 571 unsigned int i; 572 573 for (i = 0; i < fb_logo_ex_num; i++) 574 y += fb_show_logo_line(info, rotate, 575 fb_logo_ex[i].logo, y, fb_logo_ex[i].n); 576 577 return y; 578 } 579 580 #else /* !CONFIG_FB_LOGO_EXTRA */ 581 582 static inline int fb_prepare_extra_logos(struct fb_info *info, 583 unsigned int height, 584 unsigned int yres) 585 { 586 return height; 587 } 588 589 static inline int fb_show_extra_logos(struct fb_info *info, int y, int rotate) 590 { 591 return y; 592 } 593 594 #endif /* CONFIG_FB_LOGO_EXTRA */ 595 596 597 int fb_prepare_logo(struct fb_info *info, int rotate) 598 { 599 int depth = fb_get_color_depth(&info->var, &info->fix); 600 unsigned int yres; 601 602 memset(&fb_logo, 0, sizeof(struct logo_data)); 603 604 if (info->flags & FBINFO_MISC_TILEBLITTING || 605 info->fbops->owner) 606 return 0; 607 608 if (info->fix.visual == FB_VISUAL_DIRECTCOLOR) { 609 depth = info->var.blue.length; 610 if (info->var.red.length < depth) 611 depth = info->var.red.length; 612 if (info->var.green.length < depth) 613 depth = info->var.green.length; 614 } 615 616 if (info->fix.visual == FB_VISUAL_STATIC_PSEUDOCOLOR && depth > 4) { 617 /* assume console colormap */ 618 depth = 4; 619 } 620 621 /* Return if no suitable logo was found */ 622 fb_logo.logo = fb_find_logo(depth); 623 624 if (!fb_logo.logo) { 625 return 0; 626 } 627 628 if (rotate == FB_ROTATE_UR || rotate == FB_ROTATE_UD) 629 yres = info->var.yres; 630 else 631 yres = info->var.xres; 632 633 if (fb_logo.logo->height > yres) { 634 fb_logo.logo = NULL; 635 return 0; 636 } 637 638 /* What depth we asked for might be different from what we get */ 639 if (fb_logo.logo->type == LINUX_LOGO_CLUT224) 640 fb_logo.depth = 8; 641 else if (fb_logo.logo->type == LINUX_LOGO_VGA16) 642 fb_logo.depth = 4; 643 else 644 fb_logo.depth = 1; 645 646 647 if (fb_logo.depth > 4 && depth > 4) { 648 switch (info->fix.visual) { 649 case FB_VISUAL_TRUECOLOR: 650 fb_logo.needs_truepalette = 1; 651 break; 652 case FB_VISUAL_DIRECTCOLOR: 653 fb_logo.needs_directpalette = 1; 654 fb_logo.needs_cmapreset = 1; 655 break; 656 case FB_VISUAL_PSEUDOCOLOR: 657 fb_logo.needs_cmapreset = 1; 658 break; 659 } 660 } 661 662 return fb_prepare_extra_logos(info, fb_logo.logo->height, yres); 663 } 664 665 int fb_show_logo(struct fb_info *info, int rotate) 666 { 667 int y; 668 669 y = fb_show_logo_line(info, rotate, fb_logo.logo, 0, 670 num_online_cpus()); 671 y = fb_show_extra_logos(info, y, rotate); 672 673 return y; 674 } 675 #else 676 int fb_prepare_logo(struct fb_info *info, int rotate) { return 0; } 677 int fb_show_logo(struct fb_info *info, int rotate) { return 0; } 678 #endif /* CONFIG_LOGO */ 679 EXPORT_SYMBOL(fb_prepare_logo); 680 EXPORT_SYMBOL(fb_show_logo); 681 682 static void *fb_seq_start(struct seq_file *m, loff_t *pos) 683 { 684 mutex_lock(®istration_lock); 685 return (*pos < FB_MAX) ? pos : NULL; 686 } 687 688 static void *fb_seq_next(struct seq_file *m, void *v, loff_t *pos) 689 { 690 (*pos)++; 691 return (*pos < FB_MAX) ? pos : NULL; 692 } 693 694 static void fb_seq_stop(struct seq_file *m, void *v) 695 { 696 mutex_unlock(®istration_lock); 697 } 698 699 static int fb_seq_show(struct seq_file *m, void *v) 700 { 701 int i = *(loff_t *)v; 702 struct fb_info *fi = registered_fb[i]; 703 704 if (fi) 705 seq_printf(m, "%d %s\n", fi->node, fi->fix.id); 706 return 0; 707 } 708 709 static const struct seq_operations proc_fb_seq_ops = { 710 .start = fb_seq_start, 711 .next = fb_seq_next, 712 .stop = fb_seq_stop, 713 .show = fb_seq_show, 714 }; 715 716 static int proc_fb_open(struct inode *inode, struct file *file) 717 { 718 return seq_open(file, &proc_fb_seq_ops); 719 } 720 721 static const struct file_operations fb_proc_fops = { 722 .owner = THIS_MODULE, 723 .open = proc_fb_open, 724 .read = seq_read, 725 .llseek = seq_lseek, 726 .release = seq_release, 727 }; 728 729 /* 730 * We hold a reference to the fb_info in file->private_data, 731 * but if the current registered fb has changed, we don't 732 * actually want to use it. 733 * 734 * So look up the fb_info using the inode minor number, 735 * and just verify it against the reference we have. 736 */ 737 static struct fb_info *file_fb_info(struct file *file) 738 { 739 struct inode *inode = file_inode(file); 740 int fbidx = iminor(inode); 741 struct fb_info *info = registered_fb[fbidx]; 742 743 if (info != file->private_data) 744 info = NULL; 745 return info; 746 } 747 748 static ssize_t 749 fb_read(struct file *file, char __user *buf, size_t count, loff_t *ppos) 750 { 751 unsigned long p = *ppos; 752 struct fb_info *info = file_fb_info(file); 753 u8 *buffer, *dst; 754 u8 __iomem *src; 755 int c, cnt = 0, err = 0; 756 unsigned long total_size; 757 758 if (!info || ! info->screen_base) 759 return -ENODEV; 760 761 if (info->state != FBINFO_STATE_RUNNING) 762 return -EPERM; 763 764 if (info->fbops->fb_read) 765 return info->fbops->fb_read(info, buf, count, ppos); 766 767 total_size = info->screen_size; 768 769 if (total_size == 0) 770 total_size = info->fix.smem_len; 771 772 if (p >= total_size) 773 return 0; 774 775 if (count >= total_size) 776 count = total_size; 777 778 if (count + p > total_size) 779 count = total_size - p; 780 781 buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count, 782 GFP_KERNEL); 783 if (!buffer) 784 return -ENOMEM; 785 786 src = (u8 __iomem *) (info->screen_base + p); 787 788 if (info->fbops->fb_sync) 789 info->fbops->fb_sync(info); 790 791 while (count) { 792 c = (count > PAGE_SIZE) ? PAGE_SIZE : count; 793 dst = buffer; 794 fb_memcpy_fromfb(dst, src, c); 795 dst += c; 796 src += c; 797 798 if (copy_to_user(buf, buffer, c)) { 799 err = -EFAULT; 800 break; 801 } 802 *ppos += c; 803 buf += c; 804 cnt += c; 805 count -= c; 806 } 807 808 kfree(buffer); 809 810 return (err) ? err : cnt; 811 } 812 813 static ssize_t 814 fb_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos) 815 { 816 unsigned long p = *ppos; 817 struct fb_info *info = file_fb_info(file); 818 u8 *buffer, *src; 819 u8 __iomem *dst; 820 int c, cnt = 0, err = 0; 821 unsigned long total_size; 822 823 if (!info || !info->screen_base) 824 return -ENODEV; 825 826 if (info->state != FBINFO_STATE_RUNNING) 827 return -EPERM; 828 829 if (info->fbops->fb_write) 830 return info->fbops->fb_write(info, buf, count, ppos); 831 832 total_size = info->screen_size; 833 834 if (total_size == 0) 835 total_size = info->fix.smem_len; 836 837 if (p > total_size) 838 return -EFBIG; 839 840 if (count > total_size) { 841 err = -EFBIG; 842 count = total_size; 843 } 844 845 if (count + p > total_size) { 846 if (!err) 847 err = -ENOSPC; 848 849 count = total_size - p; 850 } 851 852 buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count, 853 GFP_KERNEL); 854 if (!buffer) 855 return -ENOMEM; 856 857 dst = (u8 __iomem *) (info->screen_base + p); 858 859 if (info->fbops->fb_sync) 860 info->fbops->fb_sync(info); 861 862 while (count) { 863 c = (count > PAGE_SIZE) ? PAGE_SIZE : count; 864 src = buffer; 865 866 if (copy_from_user(src, buf, c)) { 867 err = -EFAULT; 868 break; 869 } 870 871 fb_memcpy_tofb(dst, src, c); 872 dst += c; 873 src += c; 874 *ppos += c; 875 buf += c; 876 cnt += c; 877 count -= c; 878 } 879 880 kfree(buffer); 881 882 return (cnt) ? cnt : err; 883 } 884 885 int 886 fb_pan_display(struct fb_info *info, struct fb_var_screeninfo *var) 887 { 888 struct fb_fix_screeninfo *fix = &info->fix; 889 unsigned int yres = info->var.yres; 890 int err = 0; 891 892 if (var->yoffset > 0) { 893 if (var->vmode & FB_VMODE_YWRAP) { 894 if (!fix->ywrapstep || (var->yoffset % fix->ywrapstep)) 895 err = -EINVAL; 896 else 897 yres = 0; 898 } else if (!fix->ypanstep || (var->yoffset % fix->ypanstep)) 899 err = -EINVAL; 900 } 901 902 if (var->xoffset > 0 && (!fix->xpanstep || 903 (var->xoffset % fix->xpanstep))) 904 err = -EINVAL; 905 906 if (err || !info->fbops->fb_pan_display || 907 var->yoffset > info->var.yres_virtual - yres || 908 var->xoffset > info->var.xres_virtual - info->var.xres) 909 return -EINVAL; 910 911 if ((err = info->fbops->fb_pan_display(var, info))) 912 return err; 913 info->var.xoffset = var->xoffset; 914 info->var.yoffset = var->yoffset; 915 if (var->vmode & FB_VMODE_YWRAP) 916 info->var.vmode |= FB_VMODE_YWRAP; 917 else 918 info->var.vmode &= ~FB_VMODE_YWRAP; 919 return 0; 920 } 921 EXPORT_SYMBOL(fb_pan_display); 922 923 static int fb_check_caps(struct fb_info *info, struct fb_var_screeninfo *var, 924 u32 activate) 925 { 926 struct fb_event event; 927 struct fb_blit_caps caps, fbcaps; 928 int err = 0; 929 930 memset(&caps, 0, sizeof(caps)); 931 memset(&fbcaps, 0, sizeof(fbcaps)); 932 caps.flags = (activate & FB_ACTIVATE_ALL) ? 1 : 0; 933 event.info = info; 934 event.data = ∩︀ 935 fb_notifier_call_chain(FB_EVENT_GET_REQ, &event); 936 info->fbops->fb_get_caps(info, &fbcaps, var); 937 938 if (((fbcaps.x ^ caps.x) & caps.x) || 939 ((fbcaps.y ^ caps.y) & caps.y) || 940 (fbcaps.len < caps.len)) 941 err = -EINVAL; 942 943 return err; 944 } 945 946 int 947 fb_set_var(struct fb_info *info, struct fb_var_screeninfo *var) 948 { 949 int flags = info->flags; 950 int ret = 0; 951 952 if (var->activate & FB_ACTIVATE_INV_MODE) { 953 struct fb_videomode mode1, mode2; 954 955 fb_var_to_videomode(&mode1, var); 956 fb_var_to_videomode(&mode2, &info->var); 957 /* make sure we don't delete the videomode of current var */ 958 ret = fb_mode_is_equal(&mode1, &mode2); 959 960 if (!ret) { 961 struct fb_event event; 962 963 event.info = info; 964 event.data = &mode1; 965 ret = fb_notifier_call_chain(FB_EVENT_MODE_DELETE, &event); 966 } 967 968 if (!ret) 969 fb_delete_videomode(&mode1, &info->modelist); 970 971 972 ret = (ret) ? -EINVAL : 0; 973 goto done; 974 } 975 976 if ((var->activate & FB_ACTIVATE_FORCE) || 977 memcmp(&info->var, var, sizeof(struct fb_var_screeninfo))) { 978 u32 activate = var->activate; 979 980 /* When using FOURCC mode, make sure the red, green, blue and 981 * transp fields are set to 0. 982 */ 983 if ((info->fix.capabilities & FB_CAP_FOURCC) && 984 var->grayscale > 1) { 985 if (var->red.offset || var->green.offset || 986 var->blue.offset || var->transp.offset || 987 var->red.length || var->green.length || 988 var->blue.length || var->transp.length || 989 var->red.msb_right || var->green.msb_right || 990 var->blue.msb_right || var->transp.msb_right) 991 return -EINVAL; 992 } 993 994 if (!info->fbops->fb_check_var) { 995 *var = info->var; 996 goto done; 997 } 998 999 ret = info->fbops->fb_check_var(var, info); 1000 1001 if (ret) 1002 goto done; 1003 1004 if ((var->activate & FB_ACTIVATE_MASK) == FB_ACTIVATE_NOW) { 1005 struct fb_var_screeninfo old_var; 1006 struct fb_videomode mode; 1007 1008 if (info->fbops->fb_get_caps) { 1009 ret = fb_check_caps(info, var, activate); 1010 1011 if (ret) 1012 goto done; 1013 } 1014 1015 old_var = info->var; 1016 info->var = *var; 1017 1018 if (info->fbops->fb_set_par) { 1019 ret = info->fbops->fb_set_par(info); 1020 1021 if (ret) { 1022 info->var = old_var; 1023 printk(KERN_WARNING "detected " 1024 "fb_set_par error, " 1025 "error code: %d\n", ret); 1026 goto done; 1027 } 1028 } 1029 1030 fb_pan_display(info, &info->var); 1031 fb_set_cmap(&info->cmap, info); 1032 fb_var_to_videomode(&mode, &info->var); 1033 1034 if (info->modelist.prev && info->modelist.next && 1035 !list_empty(&info->modelist)) 1036 ret = fb_add_videomode(&mode, &info->modelist); 1037 1038 if (!ret && (flags & FBINFO_MISC_USEREVENT)) { 1039 struct fb_event event; 1040 int evnt = (activate & FB_ACTIVATE_ALL) ? 1041 FB_EVENT_MODE_CHANGE_ALL : 1042 FB_EVENT_MODE_CHANGE; 1043 1044 info->flags &= ~FBINFO_MISC_USEREVENT; 1045 event.info = info; 1046 event.data = &mode; 1047 fb_notifier_call_chain(evnt, &event); 1048 } 1049 } 1050 } 1051 1052 done: 1053 return ret; 1054 } 1055 EXPORT_SYMBOL(fb_set_var); 1056 1057 int 1058 fb_blank(struct fb_info *info, int blank) 1059 { 1060 struct fb_event event; 1061 int ret = -EINVAL, early_ret; 1062 1063 if (blank > FB_BLANK_POWERDOWN) 1064 blank = FB_BLANK_POWERDOWN; 1065 1066 event.info = info; 1067 event.data = ␣ 1068 1069 early_ret = fb_notifier_call_chain(FB_EARLY_EVENT_BLANK, &event); 1070 1071 if (info->fbops->fb_blank) 1072 ret = info->fbops->fb_blank(blank, info); 1073 1074 if (!ret) 1075 fb_notifier_call_chain(FB_EVENT_BLANK, &event); 1076 else { 1077 /* 1078 * if fb_blank is failed then revert effects of 1079 * the early blank event. 1080 */ 1081 if (!early_ret) 1082 fb_notifier_call_chain(FB_R_EARLY_EVENT_BLANK, &event); 1083 } 1084 1085 return ret; 1086 } 1087 EXPORT_SYMBOL(fb_blank); 1088 1089 static long do_fb_ioctl(struct fb_info *info, unsigned int cmd, 1090 unsigned long arg) 1091 { 1092 struct fb_ops *fb; 1093 struct fb_var_screeninfo var; 1094 struct fb_fix_screeninfo fix; 1095 struct fb_con2fbmap con2fb; 1096 struct fb_cmap cmap_from; 1097 struct fb_cmap_user cmap; 1098 struct fb_event event; 1099 void __user *argp = (void __user *)arg; 1100 long ret = 0; 1101 1102 switch (cmd) { 1103 case FBIOGET_VSCREENINFO: 1104 if (!lock_fb_info(info)) 1105 return -ENODEV; 1106 var = info->var; 1107 unlock_fb_info(info); 1108 1109 ret = copy_to_user(argp, &var, sizeof(var)) ? -EFAULT : 0; 1110 break; 1111 case FBIOPUT_VSCREENINFO: 1112 if (copy_from_user(&var, argp, sizeof(var))) 1113 return -EFAULT; 1114 console_lock(); 1115 if (!lock_fb_info(info)) { 1116 console_unlock(); 1117 return -ENODEV; 1118 } 1119 info->flags |= FBINFO_MISC_USEREVENT; 1120 ret = fb_set_var(info, &var); 1121 info->flags &= ~FBINFO_MISC_USEREVENT; 1122 unlock_fb_info(info); 1123 console_unlock(); 1124 if (!ret && copy_to_user(argp, &var, sizeof(var))) 1125 ret = -EFAULT; 1126 break; 1127 case FBIOGET_FSCREENINFO: 1128 if (!lock_fb_info(info)) 1129 return -ENODEV; 1130 fix = info->fix; 1131 unlock_fb_info(info); 1132 1133 ret = copy_to_user(argp, &fix, sizeof(fix)) ? -EFAULT : 0; 1134 break; 1135 case FBIOPUTCMAP: 1136 if (copy_from_user(&cmap, argp, sizeof(cmap))) 1137 return -EFAULT; 1138 ret = fb_set_user_cmap(&cmap, info); 1139 break; 1140 case FBIOGETCMAP: 1141 if (copy_from_user(&cmap, argp, sizeof(cmap))) 1142 return -EFAULT; 1143 if (!lock_fb_info(info)) 1144 return -ENODEV; 1145 cmap_from = info->cmap; 1146 unlock_fb_info(info); 1147 ret = fb_cmap_to_user(&cmap_from, &cmap); 1148 break; 1149 case FBIOPAN_DISPLAY: 1150 if (copy_from_user(&var, argp, sizeof(var))) 1151 return -EFAULT; 1152 console_lock(); 1153 if (!lock_fb_info(info)) { 1154 console_unlock(); 1155 return -ENODEV; 1156 } 1157 ret = fb_pan_display(info, &var); 1158 unlock_fb_info(info); 1159 console_unlock(); 1160 if (ret == 0 && copy_to_user(argp, &var, sizeof(var))) 1161 return -EFAULT; 1162 break; 1163 case FBIO_CURSOR: 1164 ret = -EINVAL; 1165 break; 1166 case FBIOGET_CON2FBMAP: 1167 if (copy_from_user(&con2fb, argp, sizeof(con2fb))) 1168 return -EFAULT; 1169 if (con2fb.console < 1 || con2fb.console > MAX_NR_CONSOLES) 1170 return -EINVAL; 1171 con2fb.framebuffer = -1; 1172 event.data = &con2fb; 1173 if (!lock_fb_info(info)) 1174 return -ENODEV; 1175 event.info = info; 1176 fb_notifier_call_chain(FB_EVENT_GET_CONSOLE_MAP, &event); 1177 unlock_fb_info(info); 1178 ret = copy_to_user(argp, &con2fb, sizeof(con2fb)) ? -EFAULT : 0; 1179 break; 1180 case FBIOPUT_CON2FBMAP: 1181 if (copy_from_user(&con2fb, argp, sizeof(con2fb))) 1182 return -EFAULT; 1183 if (con2fb.console < 1 || con2fb.console > MAX_NR_CONSOLES) 1184 return -EINVAL; 1185 if (con2fb.framebuffer >= FB_MAX) 1186 return -EINVAL; 1187 if (!registered_fb[con2fb.framebuffer]) 1188 request_module("fb%d", con2fb.framebuffer); 1189 if (!registered_fb[con2fb.framebuffer]) { 1190 ret = -EINVAL; 1191 break; 1192 } 1193 event.data = &con2fb; 1194 console_lock(); 1195 if (!lock_fb_info(info)) { 1196 console_unlock(); 1197 return -ENODEV; 1198 } 1199 event.info = info; 1200 ret = fb_notifier_call_chain(FB_EVENT_SET_CONSOLE_MAP, &event); 1201 unlock_fb_info(info); 1202 console_unlock(); 1203 break; 1204 case FBIOBLANK: 1205 console_lock(); 1206 if (!lock_fb_info(info)) { 1207 console_unlock(); 1208 return -ENODEV; 1209 } 1210 info->flags |= FBINFO_MISC_USEREVENT; 1211 ret = fb_blank(info, arg); 1212 info->flags &= ~FBINFO_MISC_USEREVENT; 1213 unlock_fb_info(info); 1214 console_unlock(); 1215 break; 1216 default: 1217 if (!lock_fb_info(info)) 1218 return -ENODEV; 1219 fb = info->fbops; 1220 if (fb->fb_ioctl) 1221 ret = fb->fb_ioctl(info, cmd, arg); 1222 else 1223 ret = -ENOTTY; 1224 unlock_fb_info(info); 1225 } 1226 return ret; 1227 } 1228 1229 static long fb_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 1230 { 1231 struct fb_info *info = file_fb_info(file); 1232 1233 if (!info) 1234 return -ENODEV; 1235 return do_fb_ioctl(info, cmd, arg); 1236 } 1237 1238 #ifdef CONFIG_COMPAT 1239 struct fb_fix_screeninfo32 { 1240 char id[16]; 1241 compat_caddr_t smem_start; 1242 u32 smem_len; 1243 u32 type; 1244 u32 type_aux; 1245 u32 visual; 1246 u16 xpanstep; 1247 u16 ypanstep; 1248 u16 ywrapstep; 1249 u32 line_length; 1250 compat_caddr_t mmio_start; 1251 u32 mmio_len; 1252 u32 accel; 1253 u16 reserved[3]; 1254 }; 1255 1256 struct fb_cmap32 { 1257 u32 start; 1258 u32 len; 1259 compat_caddr_t red; 1260 compat_caddr_t green; 1261 compat_caddr_t blue; 1262 compat_caddr_t transp; 1263 }; 1264 1265 static int fb_getput_cmap(struct fb_info *info, unsigned int cmd, 1266 unsigned long arg) 1267 { 1268 struct fb_cmap_user __user *cmap; 1269 struct fb_cmap32 __user *cmap32; 1270 __u32 data; 1271 int err; 1272 1273 cmap = compat_alloc_user_space(sizeof(*cmap)); 1274 cmap32 = compat_ptr(arg); 1275 1276 if (copy_in_user(&cmap->start, &cmap32->start, 2 * sizeof(__u32))) 1277 return -EFAULT; 1278 1279 if (get_user(data, &cmap32->red) || 1280 put_user(compat_ptr(data), &cmap->red) || 1281 get_user(data, &cmap32->green) || 1282 put_user(compat_ptr(data), &cmap->green) || 1283 get_user(data, &cmap32->blue) || 1284 put_user(compat_ptr(data), &cmap->blue) || 1285 get_user(data, &cmap32->transp) || 1286 put_user(compat_ptr(data), &cmap->transp)) 1287 return -EFAULT; 1288 1289 err = do_fb_ioctl(info, cmd, (unsigned long) cmap); 1290 1291 if (!err) { 1292 if (copy_in_user(&cmap32->start, 1293 &cmap->start, 1294 2 * sizeof(__u32))) 1295 err = -EFAULT; 1296 } 1297 return err; 1298 } 1299 1300 static int do_fscreeninfo_to_user(struct fb_fix_screeninfo *fix, 1301 struct fb_fix_screeninfo32 __user *fix32) 1302 { 1303 __u32 data; 1304 int err; 1305 1306 err = copy_to_user(&fix32->id, &fix->id, sizeof(fix32->id)); 1307 1308 data = (__u32) (unsigned long) fix->smem_start; 1309 err |= put_user(data, &fix32->smem_start); 1310 1311 err |= put_user(fix->smem_len, &fix32->smem_len); 1312 err |= put_user(fix->type, &fix32->type); 1313 err |= put_user(fix->type_aux, &fix32->type_aux); 1314 err |= put_user(fix->visual, &fix32->visual); 1315 err |= put_user(fix->xpanstep, &fix32->xpanstep); 1316 err |= put_user(fix->ypanstep, &fix32->ypanstep); 1317 err |= put_user(fix->ywrapstep, &fix32->ywrapstep); 1318 err |= put_user(fix->line_length, &fix32->line_length); 1319 1320 data = (__u32) (unsigned long) fix->mmio_start; 1321 err |= put_user(data, &fix32->mmio_start); 1322 1323 err |= put_user(fix->mmio_len, &fix32->mmio_len); 1324 err |= put_user(fix->accel, &fix32->accel); 1325 err |= copy_to_user(fix32->reserved, fix->reserved, 1326 sizeof(fix->reserved)); 1327 1328 if (err) 1329 return -EFAULT; 1330 return 0; 1331 } 1332 1333 static int fb_get_fscreeninfo(struct fb_info *info, unsigned int cmd, 1334 unsigned long arg) 1335 { 1336 struct fb_fix_screeninfo fix; 1337 1338 if (!lock_fb_info(info)) 1339 return -ENODEV; 1340 fix = info->fix; 1341 unlock_fb_info(info); 1342 return do_fscreeninfo_to_user(&fix, compat_ptr(arg)); 1343 } 1344 1345 static long fb_compat_ioctl(struct file *file, unsigned int cmd, 1346 unsigned long arg) 1347 { 1348 struct fb_info *info = file_fb_info(file); 1349 struct fb_ops *fb; 1350 long ret = -ENOIOCTLCMD; 1351 1352 if (!info) 1353 return -ENODEV; 1354 fb = info->fbops; 1355 switch(cmd) { 1356 case FBIOGET_VSCREENINFO: 1357 case FBIOPUT_VSCREENINFO: 1358 case FBIOPAN_DISPLAY: 1359 case FBIOGET_CON2FBMAP: 1360 case FBIOPUT_CON2FBMAP: 1361 arg = (unsigned long) compat_ptr(arg); 1362 case FBIOBLANK: 1363 ret = do_fb_ioctl(info, cmd, arg); 1364 break; 1365 1366 case FBIOGET_FSCREENINFO: 1367 ret = fb_get_fscreeninfo(info, cmd, arg); 1368 break; 1369 1370 case FBIOGETCMAP: 1371 case FBIOPUTCMAP: 1372 ret = fb_getput_cmap(info, cmd, arg); 1373 break; 1374 1375 default: 1376 if (fb->fb_compat_ioctl) 1377 ret = fb->fb_compat_ioctl(info, cmd, arg); 1378 break; 1379 } 1380 return ret; 1381 } 1382 #endif 1383 1384 static int 1385 fb_mmap(struct file *file, struct vm_area_struct * vma) 1386 { 1387 struct fb_info *info = file_fb_info(file); 1388 struct fb_ops *fb; 1389 unsigned long mmio_pgoff; 1390 unsigned long start; 1391 u32 len; 1392 1393 if (!info) 1394 return -ENODEV; 1395 fb = info->fbops; 1396 if (!fb) 1397 return -ENODEV; 1398 mutex_lock(&info->mm_lock); 1399 if (fb->fb_mmap) { 1400 int res; 1401 1402 /* 1403 * The framebuffer needs to be accessed decrypted, be sure 1404 * SME protection is removed ahead of the call 1405 */ 1406 vma->vm_page_prot = pgprot_decrypted(vma->vm_page_prot); 1407 res = fb->fb_mmap(info, vma); 1408 mutex_unlock(&info->mm_lock); 1409 return res; 1410 } 1411 1412 /* 1413 * Ugh. This can be either the frame buffer mapping, or 1414 * if pgoff points past it, the mmio mapping. 1415 */ 1416 start = info->fix.smem_start; 1417 len = info->fix.smem_len; 1418 mmio_pgoff = PAGE_ALIGN((start & ~PAGE_MASK) + len) >> PAGE_SHIFT; 1419 if (vma->vm_pgoff >= mmio_pgoff) { 1420 if (info->var.accel_flags) { 1421 mutex_unlock(&info->mm_lock); 1422 return -EINVAL; 1423 } 1424 1425 vma->vm_pgoff -= mmio_pgoff; 1426 start = info->fix.mmio_start; 1427 len = info->fix.mmio_len; 1428 } 1429 mutex_unlock(&info->mm_lock); 1430 1431 vma->vm_page_prot = vm_get_page_prot(vma->vm_flags); 1432 /* 1433 * The framebuffer needs to be accessed decrypted, be sure 1434 * SME protection is removed 1435 */ 1436 vma->vm_page_prot = pgprot_decrypted(vma->vm_page_prot); 1437 fb_pgprotect(file, vma, start); 1438 1439 return vm_iomap_memory(vma, start, len); 1440 } 1441 1442 static int 1443 fb_open(struct inode *inode, struct file *file) 1444 __acquires(&info->lock) 1445 __releases(&info->lock) 1446 { 1447 int fbidx = iminor(inode); 1448 struct fb_info *info; 1449 int res = 0; 1450 1451 info = get_fb_info(fbidx); 1452 if (!info) { 1453 request_module("fb%d", fbidx); 1454 info = get_fb_info(fbidx); 1455 if (!info) 1456 return -ENODEV; 1457 } 1458 if (IS_ERR(info)) 1459 return PTR_ERR(info); 1460 1461 mutex_lock(&info->lock); 1462 if (!try_module_get(info->fbops->owner)) { 1463 res = -ENODEV; 1464 goto out; 1465 } 1466 file->private_data = info; 1467 if (info->fbops->fb_open) { 1468 res = info->fbops->fb_open(info,1); 1469 if (res) 1470 module_put(info->fbops->owner); 1471 } 1472 #ifdef CONFIG_FB_DEFERRED_IO 1473 if (info->fbdefio) 1474 fb_deferred_io_open(info, inode, file); 1475 #endif 1476 out: 1477 mutex_unlock(&info->lock); 1478 if (res) 1479 put_fb_info(info); 1480 return res; 1481 } 1482 1483 static int 1484 fb_release(struct inode *inode, struct file *file) 1485 __acquires(&info->lock) 1486 __releases(&info->lock) 1487 { 1488 struct fb_info * const info = file->private_data; 1489 1490 mutex_lock(&info->lock); 1491 if (info->fbops->fb_release) 1492 info->fbops->fb_release(info,1); 1493 module_put(info->fbops->owner); 1494 mutex_unlock(&info->lock); 1495 put_fb_info(info); 1496 return 0; 1497 } 1498 1499 #if defined(CONFIG_FB_PROVIDE_GET_FB_UNMAPPED_AREA) && !defined(CONFIG_MMU) 1500 unsigned long get_fb_unmapped_area(struct file *filp, 1501 unsigned long addr, unsigned long len, 1502 unsigned long pgoff, unsigned long flags) 1503 { 1504 struct fb_info * const info = filp->private_data; 1505 unsigned long fb_size = PAGE_ALIGN(info->fix.smem_len); 1506 1507 if (pgoff > fb_size || len > fb_size - pgoff) 1508 return -EINVAL; 1509 1510 return (unsigned long)info->screen_base + pgoff; 1511 } 1512 #endif 1513 1514 static const struct file_operations fb_fops = { 1515 .owner = THIS_MODULE, 1516 .read = fb_read, 1517 .write = fb_write, 1518 .unlocked_ioctl = fb_ioctl, 1519 #ifdef CONFIG_COMPAT 1520 .compat_ioctl = fb_compat_ioctl, 1521 #endif 1522 .mmap = fb_mmap, 1523 .open = fb_open, 1524 .release = fb_release, 1525 #if defined(HAVE_ARCH_FB_UNMAPPED_AREA) || \ 1526 (defined(CONFIG_FB_PROVIDE_GET_FB_UNMAPPED_AREA) && \ 1527 !defined(CONFIG_MMU)) 1528 .get_unmapped_area = get_fb_unmapped_area, 1529 #endif 1530 #ifdef CONFIG_FB_DEFERRED_IO 1531 .fsync = fb_deferred_io_fsync, 1532 #endif 1533 .llseek = default_llseek, 1534 }; 1535 1536 struct class *fb_class; 1537 EXPORT_SYMBOL(fb_class); 1538 1539 static int fb_check_foreignness(struct fb_info *fi) 1540 { 1541 const bool foreign_endian = fi->flags & FBINFO_FOREIGN_ENDIAN; 1542 1543 fi->flags &= ~FBINFO_FOREIGN_ENDIAN; 1544 1545 #ifdef __BIG_ENDIAN 1546 fi->flags |= foreign_endian ? 0 : FBINFO_BE_MATH; 1547 #else 1548 fi->flags |= foreign_endian ? FBINFO_BE_MATH : 0; 1549 #endif /* __BIG_ENDIAN */ 1550 1551 if (fi->flags & FBINFO_BE_MATH && !fb_be_math(fi)) { 1552 pr_err("%s: enable CONFIG_FB_BIG_ENDIAN to " 1553 "support this framebuffer\n", fi->fix.id); 1554 return -ENOSYS; 1555 } else if (!(fi->flags & FBINFO_BE_MATH) && fb_be_math(fi)) { 1556 pr_err("%s: enable CONFIG_FB_LITTLE_ENDIAN to " 1557 "support this framebuffer\n", fi->fix.id); 1558 return -ENOSYS; 1559 } 1560 1561 return 0; 1562 } 1563 1564 static bool apertures_overlap(struct aperture *gen, struct aperture *hw) 1565 { 1566 /* is the generic aperture base the same as the HW one */ 1567 if (gen->base == hw->base) 1568 return true; 1569 /* is the generic aperture base inside the hw base->hw base+size */ 1570 if (gen->base > hw->base && gen->base < hw->base + hw->size) 1571 return true; 1572 return false; 1573 } 1574 1575 static bool fb_do_apertures_overlap(struct apertures_struct *gena, 1576 struct apertures_struct *hwa) 1577 { 1578 int i, j; 1579 if (!hwa || !gena) 1580 return false; 1581 1582 for (i = 0; i < hwa->count; ++i) { 1583 struct aperture *h = &hwa->ranges[i]; 1584 for (j = 0; j < gena->count; ++j) { 1585 struct aperture *g = &gena->ranges[j]; 1586 printk(KERN_DEBUG "checking generic (%llx %llx) vs hw (%llx %llx)\n", 1587 (unsigned long long)g->base, 1588 (unsigned long long)g->size, 1589 (unsigned long long)h->base, 1590 (unsigned long long)h->size); 1591 if (apertures_overlap(g, h)) 1592 return true; 1593 } 1594 } 1595 1596 return false; 1597 } 1598 1599 static int do_unregister_framebuffer(struct fb_info *fb_info); 1600 1601 #define VGA_FB_PHYS 0xA0000 1602 static int do_remove_conflicting_framebuffers(struct apertures_struct *a, 1603 const char *name, bool primary) 1604 { 1605 int i, ret; 1606 1607 /* check all firmware fbs and kick off if the base addr overlaps */ 1608 for (i = 0 ; i < FB_MAX; i++) { 1609 struct apertures_struct *gen_aper; 1610 if (!registered_fb[i]) 1611 continue; 1612 1613 if (!(registered_fb[i]->flags & FBINFO_MISC_FIRMWARE)) 1614 continue; 1615 1616 gen_aper = registered_fb[i]->apertures; 1617 if (fb_do_apertures_overlap(gen_aper, a) || 1618 (primary && gen_aper && gen_aper->count && 1619 gen_aper->ranges[0].base == VGA_FB_PHYS)) { 1620 1621 printk(KERN_INFO "fb: switching to %s from %s\n", 1622 name, registered_fb[i]->fix.id); 1623 ret = do_unregister_framebuffer(registered_fb[i]); 1624 if (ret) 1625 return ret; 1626 } 1627 } 1628 1629 return 0; 1630 } 1631 1632 static bool lockless_register_fb; 1633 module_param_named_unsafe(lockless_register_fb, lockless_register_fb, bool, 0400); 1634 MODULE_PARM_DESC(lockless_register_fb, 1635 "Lockless framebuffer registration for debugging [default=off]"); 1636 1637 static int do_register_framebuffer(struct fb_info *fb_info) 1638 { 1639 int i, ret; 1640 struct fb_event event; 1641 struct fb_videomode mode; 1642 1643 if (fb_check_foreignness(fb_info)) 1644 return -ENOSYS; 1645 1646 ret = do_remove_conflicting_framebuffers(fb_info->apertures, 1647 fb_info->fix.id, 1648 fb_is_primary_device(fb_info)); 1649 if (ret) 1650 return ret; 1651 1652 if (num_registered_fb == FB_MAX) 1653 return -ENXIO; 1654 1655 num_registered_fb++; 1656 for (i = 0 ; i < FB_MAX; i++) 1657 if (!registered_fb[i]) 1658 break; 1659 fb_info->node = i; 1660 atomic_set(&fb_info->count, 1); 1661 mutex_init(&fb_info->lock); 1662 mutex_init(&fb_info->mm_lock); 1663 1664 fb_info->dev = device_create(fb_class, fb_info->device, 1665 MKDEV(FB_MAJOR, i), NULL, "fb%d", i); 1666 if (IS_ERR(fb_info->dev)) { 1667 /* Not fatal */ 1668 printk(KERN_WARNING "Unable to create device for framebuffer %d; errno = %ld\n", i, PTR_ERR(fb_info->dev)); 1669 fb_info->dev = NULL; 1670 } else 1671 fb_init_device(fb_info); 1672 1673 if (fb_info->pixmap.addr == NULL) { 1674 fb_info->pixmap.addr = kmalloc(FBPIXMAPSIZE, GFP_KERNEL); 1675 if (fb_info->pixmap.addr) { 1676 fb_info->pixmap.size = FBPIXMAPSIZE; 1677 fb_info->pixmap.buf_align = 1; 1678 fb_info->pixmap.scan_align = 1; 1679 fb_info->pixmap.access_align = 32; 1680 fb_info->pixmap.flags = FB_PIXMAP_DEFAULT; 1681 } 1682 } 1683 fb_info->pixmap.offset = 0; 1684 1685 if (!fb_info->pixmap.blit_x) 1686 fb_info->pixmap.blit_x = ~(u32)0; 1687 1688 if (!fb_info->pixmap.blit_y) 1689 fb_info->pixmap.blit_y = ~(u32)0; 1690 1691 if (!fb_info->modelist.prev || !fb_info->modelist.next) 1692 INIT_LIST_HEAD(&fb_info->modelist); 1693 1694 if (fb_info->skip_vt_switch) 1695 pm_vt_switch_required(fb_info->dev, false); 1696 else 1697 pm_vt_switch_required(fb_info->dev, true); 1698 1699 fb_var_to_videomode(&mode, &fb_info->var); 1700 fb_add_videomode(&mode, &fb_info->modelist); 1701 registered_fb[i] = fb_info; 1702 1703 event.info = fb_info; 1704 if (!lockless_register_fb) 1705 console_lock(); 1706 if (!lock_fb_info(fb_info)) { 1707 if (!lockless_register_fb) 1708 console_unlock(); 1709 return -ENODEV; 1710 } 1711 1712 fb_notifier_call_chain(FB_EVENT_FB_REGISTERED, &event); 1713 unlock_fb_info(fb_info); 1714 if (!lockless_register_fb) 1715 console_unlock(); 1716 return 0; 1717 } 1718 1719 static int do_unregister_framebuffer(struct fb_info *fb_info) 1720 { 1721 struct fb_event event; 1722 int i, ret = 0; 1723 1724 i = fb_info->node; 1725 if (i < 0 || i >= FB_MAX || registered_fb[i] != fb_info) 1726 return -EINVAL; 1727 1728 console_lock(); 1729 if (!lock_fb_info(fb_info)) { 1730 console_unlock(); 1731 return -ENODEV; 1732 } 1733 1734 event.info = fb_info; 1735 ret = fb_notifier_call_chain(FB_EVENT_FB_UNBIND, &event); 1736 unlock_fb_info(fb_info); 1737 console_unlock(); 1738 1739 if (ret) 1740 return -EINVAL; 1741 1742 pm_vt_switch_unregister(fb_info->dev); 1743 1744 unlink_framebuffer(fb_info); 1745 if (fb_info->pixmap.addr && 1746 (fb_info->pixmap.flags & FB_PIXMAP_DEFAULT)) 1747 kfree(fb_info->pixmap.addr); 1748 fb_destroy_modelist(&fb_info->modelist); 1749 registered_fb[i] = NULL; 1750 num_registered_fb--; 1751 fb_cleanup_device(fb_info); 1752 event.info = fb_info; 1753 console_lock(); 1754 fb_notifier_call_chain(FB_EVENT_FB_UNREGISTERED, &event); 1755 console_unlock(); 1756 1757 /* this may free fb info */ 1758 put_fb_info(fb_info); 1759 return 0; 1760 } 1761 1762 int unlink_framebuffer(struct fb_info *fb_info) 1763 { 1764 int i; 1765 1766 i = fb_info->node; 1767 if (i < 0 || i >= FB_MAX || registered_fb[i] != fb_info) 1768 return -EINVAL; 1769 1770 if (fb_info->dev) { 1771 device_destroy(fb_class, MKDEV(FB_MAJOR, i)); 1772 fb_info->dev = NULL; 1773 } 1774 return 0; 1775 } 1776 EXPORT_SYMBOL(unlink_framebuffer); 1777 1778 int remove_conflicting_framebuffers(struct apertures_struct *a, 1779 const char *name, bool primary) 1780 { 1781 int ret; 1782 1783 mutex_lock(®istration_lock); 1784 ret = do_remove_conflicting_framebuffers(a, name, primary); 1785 mutex_unlock(®istration_lock); 1786 1787 return ret; 1788 } 1789 EXPORT_SYMBOL(remove_conflicting_framebuffers); 1790 1791 /** 1792 * register_framebuffer - registers a frame buffer device 1793 * @fb_info: frame buffer info structure 1794 * 1795 * Registers a frame buffer device @fb_info. 1796 * 1797 * Returns negative errno on error, or zero for success. 1798 * 1799 */ 1800 int 1801 register_framebuffer(struct fb_info *fb_info) 1802 { 1803 int ret; 1804 1805 mutex_lock(®istration_lock); 1806 ret = do_register_framebuffer(fb_info); 1807 mutex_unlock(®istration_lock); 1808 1809 return ret; 1810 } 1811 EXPORT_SYMBOL(register_framebuffer); 1812 1813 /** 1814 * unregister_framebuffer - releases a frame buffer device 1815 * @fb_info: frame buffer info structure 1816 * 1817 * Unregisters a frame buffer device @fb_info. 1818 * 1819 * Returns negative errno on error, or zero for success. 1820 * 1821 * This function will also notify the framebuffer console 1822 * to release the driver. 1823 * 1824 * This is meant to be called within a driver's module_exit() 1825 * function. If this is called outside module_exit(), ensure 1826 * that the driver implements fb_open() and fb_release() to 1827 * check that no processes are using the device. 1828 */ 1829 int 1830 unregister_framebuffer(struct fb_info *fb_info) 1831 { 1832 int ret; 1833 1834 mutex_lock(®istration_lock); 1835 ret = do_unregister_framebuffer(fb_info); 1836 mutex_unlock(®istration_lock); 1837 1838 return ret; 1839 } 1840 EXPORT_SYMBOL(unregister_framebuffer); 1841 1842 /** 1843 * fb_set_suspend - low level driver signals suspend 1844 * @info: framebuffer affected 1845 * @state: 0 = resuming, !=0 = suspending 1846 * 1847 * This is meant to be used by low level drivers to 1848 * signal suspend/resume to the core & clients. 1849 * It must be called with the console semaphore held 1850 */ 1851 void fb_set_suspend(struct fb_info *info, int state) 1852 { 1853 struct fb_event event; 1854 1855 event.info = info; 1856 if (state) { 1857 fb_notifier_call_chain(FB_EVENT_SUSPEND, &event); 1858 info->state = FBINFO_STATE_SUSPENDED; 1859 } else { 1860 info->state = FBINFO_STATE_RUNNING; 1861 fb_notifier_call_chain(FB_EVENT_RESUME, &event); 1862 } 1863 } 1864 EXPORT_SYMBOL(fb_set_suspend); 1865 1866 /** 1867 * fbmem_init - init frame buffer subsystem 1868 * 1869 * Initialize the frame buffer subsystem. 1870 * 1871 * NOTE: This function is _only_ to be called by drivers/char/mem.c. 1872 * 1873 */ 1874 1875 static int __init 1876 fbmem_init(void) 1877 { 1878 int ret; 1879 1880 if (!proc_create("fb", 0, NULL, &fb_proc_fops)) 1881 return -ENOMEM; 1882 1883 ret = register_chrdev(FB_MAJOR, "fb", &fb_fops); 1884 if (ret) { 1885 printk("unable to get major %d for fb devs\n", FB_MAJOR); 1886 goto err_chrdev; 1887 } 1888 1889 fb_class = class_create(THIS_MODULE, "graphics"); 1890 if (IS_ERR(fb_class)) { 1891 ret = PTR_ERR(fb_class); 1892 pr_warn("Unable to create fb class; errno = %d\n", ret); 1893 fb_class = NULL; 1894 goto err_class; 1895 } 1896 1897 fb_console_init(); 1898 1899 return 0; 1900 1901 err_class: 1902 unregister_chrdev(FB_MAJOR, "fb"); 1903 err_chrdev: 1904 remove_proc_entry("fb", NULL); 1905 return ret; 1906 } 1907 1908 #ifdef MODULE 1909 module_init(fbmem_init); 1910 static void __exit 1911 fbmem_exit(void) 1912 { 1913 fb_console_exit(); 1914 1915 remove_proc_entry("fb", NULL); 1916 class_destroy(fb_class); 1917 unregister_chrdev(FB_MAJOR, "fb"); 1918 } 1919 1920 module_exit(fbmem_exit); 1921 MODULE_LICENSE("GPL"); 1922 MODULE_DESCRIPTION("Framebuffer base"); 1923 #else 1924 subsys_initcall(fbmem_init); 1925 #endif 1926 1927 int fb_new_modelist(struct fb_info *info) 1928 { 1929 struct fb_event event; 1930 struct fb_var_screeninfo var = info->var; 1931 struct list_head *pos, *n; 1932 struct fb_modelist *modelist; 1933 struct fb_videomode *m, mode; 1934 int err = 1; 1935 1936 list_for_each_safe(pos, n, &info->modelist) { 1937 modelist = list_entry(pos, struct fb_modelist, list); 1938 m = &modelist->mode; 1939 fb_videomode_to_var(&var, m); 1940 var.activate = FB_ACTIVATE_TEST; 1941 err = fb_set_var(info, &var); 1942 fb_var_to_videomode(&mode, &var); 1943 if (err || !fb_mode_is_equal(m, &mode)) { 1944 list_del(pos); 1945 kfree(pos); 1946 } 1947 } 1948 1949 err = 1; 1950 1951 if (!list_empty(&info->modelist)) { 1952 event.info = info; 1953 err = fb_notifier_call_chain(FB_EVENT_NEW_MODELIST, &event); 1954 } 1955 1956 return err; 1957 } 1958 1959 MODULE_LICENSE("GPL"); 1960