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