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 36 #include <asm/fb.h> 37 38 39 /* 40 * Frame buffer device initialization and setup routines 41 */ 42 43 #define FBPIXMAPSIZE (1024 * 8) 44 45 static DEFINE_MUTEX(registration_lock); 46 47 struct fb_info *registered_fb[FB_MAX] __read_mostly; 48 EXPORT_SYMBOL(registered_fb); 49 50 int num_registered_fb __read_mostly; 51 EXPORT_SYMBOL(num_registered_fb); 52 53 static struct fb_info *get_fb_info(unsigned int idx) 54 { 55 struct fb_info *fb_info; 56 57 if (idx >= FB_MAX) 58 return ERR_PTR(-ENODEV); 59 60 mutex_lock(®istration_lock); 61 fb_info = registered_fb[idx]; 62 if (fb_info) 63 atomic_inc(&fb_info->count); 64 mutex_unlock(®istration_lock); 65 66 return fb_info; 67 } 68 69 static void put_fb_info(struct fb_info *fb_info) 70 { 71 if (!atomic_dec_and_test(&fb_info->count)) 72 return; 73 if (fb_info->fbops->fb_destroy) 74 fb_info->fbops->fb_destroy(fb_info); 75 } 76 77 int lock_fb_info(struct fb_info *info) 78 { 79 mutex_lock(&info->lock); 80 if (!info->fbops) { 81 mutex_unlock(&info->lock); 82 return 0; 83 } 84 return 1; 85 } 86 EXPORT_SYMBOL(lock_fb_info); 87 88 /* 89 * Helpers 90 */ 91 92 int fb_get_color_depth(struct fb_var_screeninfo *var, 93 struct fb_fix_screeninfo *fix) 94 { 95 int depth = 0; 96 97 if (fix->visual == FB_VISUAL_MONO01 || 98 fix->visual == FB_VISUAL_MONO10) 99 depth = 1; 100 else { 101 if (var->green.length == var->blue.length && 102 var->green.length == var->red.length && 103 var->green.offset == var->blue.offset && 104 var->green.offset == var->red.offset) 105 depth = var->green.length; 106 else 107 depth = var->green.length + var->red.length + 108 var->blue.length; 109 } 110 111 return depth; 112 } 113 EXPORT_SYMBOL(fb_get_color_depth); 114 115 /* 116 * Data padding functions. 117 */ 118 void fb_pad_aligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 s_pitch, u32 height) 119 { 120 __fb_pad_aligned_buffer(dst, d_pitch, src, s_pitch, height); 121 } 122 EXPORT_SYMBOL(fb_pad_aligned_buffer); 123 124 void fb_pad_unaligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 idx, u32 height, 125 u32 shift_high, u32 shift_low, u32 mod) 126 { 127 u8 mask = (u8) (0xfff << shift_high), tmp; 128 int i, j; 129 130 for (i = height; i--; ) { 131 for (j = 0; j < idx; j++) { 132 tmp = dst[j]; 133 tmp &= mask; 134 tmp |= *src >> shift_low; 135 dst[j] = tmp; 136 tmp = *src << shift_high; 137 dst[j+1] = tmp; 138 src++; 139 } 140 tmp = dst[idx]; 141 tmp &= mask; 142 tmp |= *src >> shift_low; 143 dst[idx] = tmp; 144 if (shift_high < mod) { 145 tmp = *src << shift_high; 146 dst[idx+1] = tmp; 147 } 148 src++; 149 dst += d_pitch; 150 } 151 } 152 EXPORT_SYMBOL(fb_pad_unaligned_buffer); 153 154 /* 155 * we need to lock this section since fb_cursor 156 * may use fb_imageblit() 157 */ 158 char* fb_get_buffer_offset(struct fb_info *info, struct fb_pixmap *buf, u32 size) 159 { 160 u32 align = buf->buf_align - 1, offset; 161 char *addr = buf->addr; 162 163 /* If IO mapped, we need to sync before access, no sharing of 164 * the pixmap is done 165 */ 166 if (buf->flags & FB_PIXMAP_IO) { 167 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC)) 168 info->fbops->fb_sync(info); 169 return addr; 170 } 171 172 /* See if we fit in the remaining pixmap space */ 173 offset = buf->offset + align; 174 offset &= ~align; 175 if (offset + size > buf->size) { 176 /* We do not fit. In order to be able to re-use the buffer, 177 * we must ensure no asynchronous DMA'ing or whatever operation 178 * is in progress, we sync for that. 179 */ 180 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC)) 181 info->fbops->fb_sync(info); 182 offset = 0; 183 } 184 buf->offset = offset + size; 185 addr += offset; 186 187 return addr; 188 } 189 EXPORT_SYMBOL(fb_get_buffer_offset); 190 191 #ifdef CONFIG_LOGO 192 193 static inline unsigned safe_shift(unsigned d, int n) 194 { 195 return n < 0 ? d >> -n : d << n; 196 } 197 198 static void fb_set_logocmap(struct fb_info *info, 199 const struct linux_logo *logo) 200 { 201 struct fb_cmap palette_cmap; 202 u16 palette_green[16]; 203 u16 palette_blue[16]; 204 u16 palette_red[16]; 205 int i, j, n; 206 const unsigned char *clut = logo->clut; 207 208 palette_cmap.start = 0; 209 palette_cmap.len = 16; 210 palette_cmap.red = palette_red; 211 palette_cmap.green = palette_green; 212 palette_cmap.blue = palette_blue; 213 palette_cmap.transp = NULL; 214 215 for (i = 0; i < logo->clutsize; i += n) { 216 n = logo->clutsize - i; 217 /* palette_cmap provides space for only 16 colors at once */ 218 if (n > 16) 219 n = 16; 220 palette_cmap.start = 32 + i; 221 palette_cmap.len = n; 222 for (j = 0; j < n; ++j) { 223 palette_cmap.red[j] = clut[0] << 8 | clut[0]; 224 palette_cmap.green[j] = clut[1] << 8 | clut[1]; 225 palette_cmap.blue[j] = clut[2] << 8 | clut[2]; 226 clut += 3; 227 } 228 fb_set_cmap(&palette_cmap, info); 229 } 230 } 231 232 static void fb_set_logo_truepalette(struct fb_info *info, 233 const struct linux_logo *logo, 234 u32 *palette) 235 { 236 static const unsigned char mask[] = { 0,0x80,0xc0,0xe0,0xf0,0xf8,0xfc,0xfe,0xff }; 237 unsigned char redmask, greenmask, bluemask; 238 int redshift, greenshift, blueshift; 239 int i; 240 const unsigned char *clut = logo->clut; 241 242 /* 243 * We have to create a temporary palette since console palette is only 244 * 16 colors long. 245 */ 246 /* Bug: Doesn't obey msb_right ... (who needs that?) */ 247 redmask = mask[info->var.red.length < 8 ? info->var.red.length : 8]; 248 greenmask = mask[info->var.green.length < 8 ? info->var.green.length : 8]; 249 bluemask = mask[info->var.blue.length < 8 ? info->var.blue.length : 8]; 250 redshift = info->var.red.offset - (8 - info->var.red.length); 251 greenshift = info->var.green.offset - (8 - info->var.green.length); 252 blueshift = info->var.blue.offset - (8 - info->var.blue.length); 253 254 for ( i = 0; i < logo->clutsize; i++) { 255 palette[i+32] = (safe_shift((clut[0] & redmask), redshift) | 256 safe_shift((clut[1] & greenmask), greenshift) | 257 safe_shift((clut[2] & bluemask), blueshift)); 258 clut += 3; 259 } 260 } 261 262 static void fb_set_logo_directpalette(struct fb_info *info, 263 const struct linux_logo *logo, 264 u32 *palette) 265 { 266 int redshift, greenshift, blueshift; 267 int i; 268 269 redshift = info->var.red.offset; 270 greenshift = info->var.green.offset; 271 blueshift = info->var.blue.offset; 272 273 for (i = 32; i < 32 + logo->clutsize; i++) 274 palette[i] = i << redshift | i << greenshift | i << blueshift; 275 } 276 277 static void fb_set_logo(struct fb_info *info, 278 const struct linux_logo *logo, u8 *dst, 279 int depth) 280 { 281 int i, j, k; 282 const u8 *src = logo->data; 283 u8 xor = (info->fix.visual == FB_VISUAL_MONO01) ? 0xff : 0; 284 u8 fg = 1, d; 285 286 switch (fb_get_color_depth(&info->var, &info->fix)) { 287 case 1: 288 fg = 1; 289 break; 290 case 2: 291 fg = 3; 292 break; 293 default: 294 fg = 7; 295 break; 296 } 297 298 if (info->fix.visual == FB_VISUAL_MONO01 || 299 info->fix.visual == FB_VISUAL_MONO10) 300 fg = ~((u8) (0xfff << info->var.green.length)); 301 302 switch (depth) { 303 case 4: 304 for (i = 0; i < logo->height; i++) 305 for (j = 0; j < logo->width; src++) { 306 *dst++ = *src >> 4; 307 j++; 308 if (j < logo->width) { 309 *dst++ = *src & 0x0f; 310 j++; 311 } 312 } 313 break; 314 case 1: 315 for (i = 0; i < logo->height; i++) { 316 for (j = 0; j < logo->width; src++) { 317 d = *src ^ xor; 318 for (k = 7; k >= 0; k--) { 319 *dst++ = ((d >> k) & 1) ? fg : 0; 320 j++; 321 } 322 } 323 } 324 break; 325 } 326 } 327 328 /* 329 * Three (3) kinds of logo maps exist. linux_logo_clut224 (>16 colors), 330 * linux_logo_vga16 (16 colors) and linux_logo_mono (2 colors). Depending on 331 * the visual format and color depth of the framebuffer, the DAC, the 332 * pseudo_palette, and the logo data will be adjusted accordingly. 333 * 334 * Case 1 - linux_logo_clut224: 335 * Color exceeds the number of console colors (16), thus we set the hardware DAC 336 * using fb_set_cmap() appropriately. The "needs_cmapreset" flag will be set. 337 * 338 * For visuals that require color info from the pseudo_palette, we also construct 339 * one for temporary use. The "needs_directpalette" or "needs_truepalette" flags 340 * will be set. 341 * 342 * Case 2 - linux_logo_vga16: 343 * The number of colors just matches the console colors, thus there is no need 344 * to set the DAC or the pseudo_palette. However, the bitmap is packed, ie, 345 * each byte contains color information for two pixels (upper and lower nibble). 346 * To be consistent with fb_imageblit() usage, we therefore separate the two 347 * nibbles into separate bytes. The "depth" flag will be set to 4. 348 * 349 * Case 3 - linux_logo_mono: 350 * This is similar with Case 2. Each byte contains information for 8 pixels. 351 * We isolate each bit and expand each into a byte. The "depth" flag will 352 * be set to 1. 353 */ 354 static struct logo_data { 355 int depth; 356 int needs_directpalette; 357 int needs_truepalette; 358 int needs_cmapreset; 359 const struct linux_logo *logo; 360 } fb_logo __read_mostly; 361 362 static void fb_rotate_logo_ud(const u8 *in, u8 *out, u32 width, u32 height) 363 { 364 u32 size = width * height, i; 365 366 out += size - 1; 367 368 for (i = size; i--; ) 369 *out-- = *in++; 370 } 371 372 static void fb_rotate_logo_cw(const u8 *in, u8 *out, u32 width, u32 height) 373 { 374 int i, j, h = height - 1; 375 376 for (i = 0; i < height; i++) 377 for (j = 0; j < width; j++) 378 out[height * j + h - i] = *in++; 379 } 380 381 static void fb_rotate_logo_ccw(const u8 *in, u8 *out, u32 width, u32 height) 382 { 383 int i, j, w = width - 1; 384 385 for (i = 0; i < height; i++) 386 for (j = 0; j < width; j++) 387 out[height * (w - j) + i] = *in++; 388 } 389 390 static void fb_rotate_logo(struct fb_info *info, u8 *dst, 391 struct fb_image *image, int rotate) 392 { 393 u32 tmp; 394 395 if (rotate == FB_ROTATE_UD) { 396 fb_rotate_logo_ud(image->data, dst, image->width, 397 image->height); 398 image->dx = info->var.xres - image->width - image->dx; 399 image->dy = info->var.yres - image->height - image->dy; 400 } else if (rotate == FB_ROTATE_CW) { 401 fb_rotate_logo_cw(image->data, dst, image->width, 402 image->height); 403 tmp = image->width; 404 image->width = image->height; 405 image->height = tmp; 406 tmp = image->dy; 407 image->dy = image->dx; 408 image->dx = info->var.xres - image->width - tmp; 409 } else if (rotate == FB_ROTATE_CCW) { 410 fb_rotate_logo_ccw(image->data, dst, image->width, 411 image->height); 412 tmp = image->width; 413 image->width = image->height; 414 image->height = tmp; 415 tmp = image->dx; 416 image->dx = image->dy; 417 image->dy = info->var.yres - image->height - tmp; 418 } 419 420 image->data = dst; 421 } 422 423 static void fb_do_show_logo(struct fb_info *info, struct fb_image *image, 424 int rotate, unsigned int num) 425 { 426 unsigned int x; 427 428 if (rotate == FB_ROTATE_UR) { 429 for (x = 0; 430 x < num && image->dx + image->width <= info->var.xres; 431 x++) { 432 info->fbops->fb_imageblit(info, image); 433 image->dx += image->width + 8; 434 } 435 } else if (rotate == FB_ROTATE_UD) { 436 for (x = 0; x < num && image->dx >= 0; x++) { 437 info->fbops->fb_imageblit(info, image); 438 image->dx -= image->width + 8; 439 } 440 } else if (rotate == FB_ROTATE_CW) { 441 for (x = 0; 442 x < num && image->dy + image->height <= info->var.yres; 443 x++) { 444 info->fbops->fb_imageblit(info, image); 445 image->dy += image->height + 8; 446 } 447 } else if (rotate == FB_ROTATE_CCW) { 448 for (x = 0; x < num && image->dy >= 0; x++) { 449 info->fbops->fb_imageblit(info, image); 450 image->dy -= image->height + 8; 451 } 452 } 453 } 454 455 static int fb_show_logo_line(struct fb_info *info, int rotate, 456 const struct linux_logo *logo, int y, 457 unsigned int n) 458 { 459 u32 *palette = NULL, *saved_pseudo_palette = NULL; 460 unsigned char *logo_new = NULL, *logo_rotate = NULL; 461 struct fb_image image; 462 463 /* Return if the frame buffer is not mapped or suspended */ 464 if (logo == NULL || info->state != FBINFO_STATE_RUNNING || 465 info->flags & FBINFO_MODULE) 466 return 0; 467 468 image.depth = 8; 469 image.data = logo->data; 470 471 if (fb_logo.needs_cmapreset) 472 fb_set_logocmap(info, logo); 473 474 if (fb_logo.needs_truepalette || 475 fb_logo.needs_directpalette) { 476 palette = kmalloc(256 * 4, GFP_KERNEL); 477 if (palette == NULL) 478 return 0; 479 480 if (fb_logo.needs_truepalette) 481 fb_set_logo_truepalette(info, logo, palette); 482 else 483 fb_set_logo_directpalette(info, logo, palette); 484 485 saved_pseudo_palette = info->pseudo_palette; 486 info->pseudo_palette = palette; 487 } 488 489 if (fb_logo.depth <= 4) { 490 logo_new = kmalloc(logo->width * logo->height, GFP_KERNEL); 491 if (logo_new == NULL) { 492 kfree(palette); 493 if (saved_pseudo_palette) 494 info->pseudo_palette = saved_pseudo_palette; 495 return 0; 496 } 497 image.data = logo_new; 498 fb_set_logo(info, logo, logo_new, fb_logo.depth); 499 } 500 501 image.dx = 0; 502 image.dy = y; 503 image.width = logo->width; 504 image.height = logo->height; 505 506 if (rotate) { 507 logo_rotate = kmalloc(logo->width * 508 logo->height, GFP_KERNEL); 509 if (logo_rotate) 510 fb_rotate_logo(info, logo_rotate, &image, rotate); 511 } 512 513 fb_do_show_logo(info, &image, rotate, n); 514 515 kfree(palette); 516 if (saved_pseudo_palette != NULL) 517 info->pseudo_palette = saved_pseudo_palette; 518 kfree(logo_new); 519 kfree(logo_rotate); 520 return logo->height; 521 } 522 523 524 #ifdef CONFIG_FB_LOGO_EXTRA 525 526 #define FB_LOGO_EX_NUM_MAX 10 527 static struct logo_data_extra { 528 const struct linux_logo *logo; 529 unsigned int n; 530 } fb_logo_ex[FB_LOGO_EX_NUM_MAX]; 531 static unsigned int fb_logo_ex_num; 532 533 void fb_append_extra_logo(const struct linux_logo *logo, unsigned int n) 534 { 535 if (!n || fb_logo_ex_num == FB_LOGO_EX_NUM_MAX) 536 return; 537 538 fb_logo_ex[fb_logo_ex_num].logo = logo; 539 fb_logo_ex[fb_logo_ex_num].n = n; 540 fb_logo_ex_num++; 541 } 542 543 static int fb_prepare_extra_logos(struct fb_info *info, unsigned int height, 544 unsigned int yres) 545 { 546 unsigned int i; 547 548 /* FIXME: logo_ex supports only truecolor fb. */ 549 if (info->fix.visual != FB_VISUAL_TRUECOLOR) 550 fb_logo_ex_num = 0; 551 552 for (i = 0; i < fb_logo_ex_num; i++) { 553 if (fb_logo_ex[i].logo->type != fb_logo.logo->type) { 554 fb_logo_ex[i].logo = NULL; 555 continue; 556 } 557 height += fb_logo_ex[i].logo->height; 558 if (height > yres) { 559 height -= fb_logo_ex[i].logo->height; 560 fb_logo_ex_num = i; 561 break; 562 } 563 } 564 return height; 565 } 566 567 static int fb_show_extra_logos(struct fb_info *info, int y, int rotate) 568 { 569 unsigned int i; 570 571 for (i = 0; i < fb_logo_ex_num; i++) 572 y += fb_show_logo_line(info, rotate, 573 fb_logo_ex[i].logo, y, fb_logo_ex[i].n); 574 575 return y; 576 } 577 578 #else /* !CONFIG_FB_LOGO_EXTRA */ 579 580 static inline int fb_prepare_extra_logos(struct fb_info *info, 581 unsigned int height, 582 unsigned int yres) 583 { 584 return height; 585 } 586 587 static inline int fb_show_extra_logos(struct fb_info *info, int y, int rotate) 588 { 589 return y; 590 } 591 592 #endif /* CONFIG_FB_LOGO_EXTRA */ 593 594 595 int fb_prepare_logo(struct fb_info *info, int rotate) 596 { 597 int depth = fb_get_color_depth(&info->var, &info->fix); 598 unsigned int yres; 599 600 memset(&fb_logo, 0, sizeof(struct logo_data)); 601 602 if (info->flags & FBINFO_MISC_TILEBLITTING || 603 info->flags & FBINFO_MODULE) 604 return 0; 605 606 if (info->fix.visual == FB_VISUAL_DIRECTCOLOR) { 607 depth = info->var.blue.length; 608 if (info->var.red.length < depth) 609 depth = info->var.red.length; 610 if (info->var.green.length < depth) 611 depth = info->var.green.length; 612 } 613 614 if (info->fix.visual == FB_VISUAL_STATIC_PSEUDOCOLOR && depth > 4) { 615 /* assume console colormap */ 616 depth = 4; 617 } 618 619 /* Return if no suitable logo was found */ 620 fb_logo.logo = fb_find_logo(depth); 621 622 if (!fb_logo.logo) { 623 return 0; 624 } 625 626 if (rotate == FB_ROTATE_UR || rotate == FB_ROTATE_UD) 627 yres = info->var.yres; 628 else 629 yres = info->var.xres; 630 631 if (fb_logo.logo->height > yres) { 632 fb_logo.logo = NULL; 633 return 0; 634 } 635 636 /* What depth we asked for might be different from what we get */ 637 if (fb_logo.logo->type == LINUX_LOGO_CLUT224) 638 fb_logo.depth = 8; 639 else if (fb_logo.logo->type == LINUX_LOGO_VGA16) 640 fb_logo.depth = 4; 641 else 642 fb_logo.depth = 1; 643 644 645 if (fb_logo.depth > 4 && depth > 4) { 646 switch (info->fix.visual) { 647 case FB_VISUAL_TRUECOLOR: 648 fb_logo.needs_truepalette = 1; 649 break; 650 case FB_VISUAL_DIRECTCOLOR: 651 fb_logo.needs_directpalette = 1; 652 fb_logo.needs_cmapreset = 1; 653 break; 654 case FB_VISUAL_PSEUDOCOLOR: 655 fb_logo.needs_cmapreset = 1; 656 break; 657 } 658 } 659 660 return fb_prepare_extra_logos(info, fb_logo.logo->height, yres); 661 } 662 663 int fb_show_logo(struct fb_info *info, int rotate) 664 { 665 int y; 666 667 y = fb_show_logo_line(info, rotate, fb_logo.logo, 0, 668 num_online_cpus()); 669 y = fb_show_extra_logos(info, y, rotate); 670 671 return y; 672 } 673 #else 674 int fb_prepare_logo(struct fb_info *info, int rotate) { return 0; } 675 int fb_show_logo(struct fb_info *info, int rotate) { return 0; } 676 #endif /* CONFIG_LOGO */ 677 EXPORT_SYMBOL(fb_show_logo); 678 679 static void *fb_seq_start(struct seq_file *m, loff_t *pos) 680 { 681 mutex_lock(®istration_lock); 682 return (*pos < FB_MAX) ? pos : NULL; 683 } 684 685 static void *fb_seq_next(struct seq_file *m, void *v, loff_t *pos) 686 { 687 (*pos)++; 688 return (*pos < FB_MAX) ? pos : NULL; 689 } 690 691 static void fb_seq_stop(struct seq_file *m, void *v) 692 { 693 mutex_unlock(®istration_lock); 694 } 695 696 static int fb_seq_show(struct seq_file *m, void *v) 697 { 698 int i = *(loff_t *)v; 699 struct fb_info *fi = registered_fb[i]; 700 701 if (fi) 702 seq_printf(m, "%d %s\n", fi->node, fi->fix.id); 703 return 0; 704 } 705 706 static const struct seq_operations proc_fb_seq_ops = { 707 .start = fb_seq_start, 708 .next = fb_seq_next, 709 .stop = fb_seq_stop, 710 .show = fb_seq_show, 711 }; 712 713 static int proc_fb_open(struct inode *inode, struct file *file) 714 { 715 return seq_open(file, &proc_fb_seq_ops); 716 } 717 718 static const struct file_operations fb_proc_fops = { 719 .owner = THIS_MODULE, 720 .open = proc_fb_open, 721 .read = seq_read, 722 .llseek = seq_lseek, 723 .release = seq_release, 724 }; 725 726 /* 727 * We hold a reference to the fb_info in file->private_data, 728 * but if the current registered fb has changed, we don't 729 * actually want to use it. 730 * 731 * So look up the fb_info using the inode minor number, 732 * and just verify it against the reference we have. 733 */ 734 static struct fb_info *file_fb_info(struct file *file) 735 { 736 struct inode *inode = file_inode(file); 737 int fbidx = iminor(inode); 738 struct fb_info *info = registered_fb[fbidx]; 739 740 if (info != file->private_data) 741 info = NULL; 742 return info; 743 } 744 745 static ssize_t 746 fb_read(struct file *file, char __user *buf, size_t count, loff_t *ppos) 747 { 748 unsigned long p = *ppos; 749 struct fb_info *info = file_fb_info(file); 750 u8 *buffer, *dst; 751 u8 __iomem *src; 752 int c, cnt = 0, err = 0; 753 unsigned long total_size; 754 755 if (!info || ! info->screen_base) 756 return -ENODEV; 757 758 if (info->state != FBINFO_STATE_RUNNING) 759 return -EPERM; 760 761 if (info->fbops->fb_read) 762 return info->fbops->fb_read(info, buf, count, ppos); 763 764 total_size = info->screen_size; 765 766 if (total_size == 0) 767 total_size = info->fix.smem_len; 768 769 if (p >= total_size) 770 return 0; 771 772 if (count >= total_size) 773 count = total_size; 774 775 if (count + p > total_size) 776 count = total_size - p; 777 778 buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count, 779 GFP_KERNEL); 780 if (!buffer) 781 return -ENOMEM; 782 783 src = (u8 __iomem *) (info->screen_base + p); 784 785 if (info->fbops->fb_sync) 786 info->fbops->fb_sync(info); 787 788 while (count) { 789 c = (count > PAGE_SIZE) ? PAGE_SIZE : count; 790 dst = buffer; 791 fb_memcpy_fromfb(dst, src, c); 792 dst += c; 793 src += c; 794 795 if (copy_to_user(buf, buffer, c)) { 796 err = -EFAULT; 797 break; 798 } 799 *ppos += c; 800 buf += c; 801 cnt += c; 802 count -= c; 803 } 804 805 kfree(buffer); 806 807 return (err) ? err : cnt; 808 } 809 810 static ssize_t 811 fb_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos) 812 { 813 unsigned long p = *ppos; 814 struct fb_info *info = file_fb_info(file); 815 u8 *buffer, *src; 816 u8 __iomem *dst; 817 int c, cnt = 0, err = 0; 818 unsigned long total_size; 819 820 if (!info || !info->screen_base) 821 return -ENODEV; 822 823 if (info->state != FBINFO_STATE_RUNNING) 824 return -EPERM; 825 826 if (info->fbops->fb_write) 827 return info->fbops->fb_write(info, buf, count, ppos); 828 829 total_size = info->screen_size; 830 831 if (total_size == 0) 832 total_size = info->fix.smem_len; 833 834 if (p > total_size) 835 return -EFBIG; 836 837 if (count > total_size) { 838 err = -EFBIG; 839 count = total_size; 840 } 841 842 if (count + p > total_size) { 843 if (!err) 844 err = -ENOSPC; 845 846 count = total_size - p; 847 } 848 849 buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count, 850 GFP_KERNEL); 851 if (!buffer) 852 return -ENOMEM; 853 854 dst = (u8 __iomem *) (info->screen_base + p); 855 856 if (info->fbops->fb_sync) 857 info->fbops->fb_sync(info); 858 859 while (count) { 860 c = (count > PAGE_SIZE) ? PAGE_SIZE : count; 861 src = buffer; 862 863 if (copy_from_user(src, buf, c)) { 864 err = -EFAULT; 865 break; 866 } 867 868 fb_memcpy_tofb(dst, src, c); 869 dst += c; 870 src += c; 871 *ppos += c; 872 buf += c; 873 cnt += c; 874 count -= c; 875 } 876 877 kfree(buffer); 878 879 return (cnt) ? cnt : err; 880 } 881 882 int 883 fb_pan_display(struct fb_info *info, struct fb_var_screeninfo *var) 884 { 885 struct fb_fix_screeninfo *fix = &info->fix; 886 unsigned int yres = info->var.yres; 887 int err = 0; 888 889 if (var->yoffset > 0) { 890 if (var->vmode & FB_VMODE_YWRAP) { 891 if (!fix->ywrapstep || (var->yoffset % fix->ywrapstep)) 892 err = -EINVAL; 893 else 894 yres = 0; 895 } else if (!fix->ypanstep || (var->yoffset % fix->ypanstep)) 896 err = -EINVAL; 897 } 898 899 if (var->xoffset > 0 && (!fix->xpanstep || 900 (var->xoffset % fix->xpanstep))) 901 err = -EINVAL; 902 903 if (err || !info->fbops->fb_pan_display || 904 var->yoffset > info->var.yres_virtual - yres || 905 var->xoffset > info->var.xres_virtual - info->var.xres) 906 return -EINVAL; 907 908 if ((err = info->fbops->fb_pan_display(var, info))) 909 return err; 910 info->var.xoffset = var->xoffset; 911 info->var.yoffset = var->yoffset; 912 if (var->vmode & FB_VMODE_YWRAP) 913 info->var.vmode |= FB_VMODE_YWRAP; 914 else 915 info->var.vmode &= ~FB_VMODE_YWRAP; 916 return 0; 917 } 918 EXPORT_SYMBOL(fb_pan_display); 919 920 static int fb_check_caps(struct fb_info *info, struct fb_var_screeninfo *var, 921 u32 activate) 922 { 923 struct fb_event event; 924 struct fb_blit_caps caps, fbcaps; 925 int err = 0; 926 927 memset(&caps, 0, sizeof(caps)); 928 memset(&fbcaps, 0, sizeof(fbcaps)); 929 caps.flags = (activate & FB_ACTIVATE_ALL) ? 1 : 0; 930 event.info = info; 931 event.data = ∩︀ 932 fb_notifier_call_chain(FB_EVENT_GET_REQ, &event); 933 info->fbops->fb_get_caps(info, &fbcaps, var); 934 935 if (((fbcaps.x ^ caps.x) & caps.x) || 936 ((fbcaps.y ^ caps.y) & caps.y) || 937 (fbcaps.len < caps.len)) 938 err = -EINVAL; 939 940 return err; 941 } 942 943 int 944 fb_set_var(struct fb_info *info, struct fb_var_screeninfo *var) 945 { 946 int flags = info->flags; 947 int ret = 0; 948 949 if (var->activate & FB_ACTIVATE_INV_MODE) { 950 struct fb_videomode mode1, mode2; 951 952 fb_var_to_videomode(&mode1, var); 953 fb_var_to_videomode(&mode2, &info->var); 954 /* make sure we don't delete the videomode of current var */ 955 ret = fb_mode_is_equal(&mode1, &mode2); 956 957 if (!ret) { 958 struct fb_event event; 959 960 event.info = info; 961 event.data = &mode1; 962 ret = fb_notifier_call_chain(FB_EVENT_MODE_DELETE, &event); 963 } 964 965 if (!ret) 966 fb_delete_videomode(&mode1, &info->modelist); 967 968 969 ret = (ret) ? -EINVAL : 0; 970 goto done; 971 } 972 973 if ((var->activate & FB_ACTIVATE_FORCE) || 974 memcmp(&info->var, var, sizeof(struct fb_var_screeninfo))) { 975 u32 activate = var->activate; 976 977 /* When using FOURCC mode, make sure the red, green, blue and 978 * transp fields are set to 0. 979 */ 980 if ((info->fix.capabilities & FB_CAP_FOURCC) && 981 var->grayscale > 1) { 982 if (var->red.offset || var->green.offset || 983 var->blue.offset || var->transp.offset || 984 var->red.length || var->green.length || 985 var->blue.length || var->transp.length || 986 var->red.msb_right || var->green.msb_right || 987 var->blue.msb_right || var->transp.msb_right) 988 return -EINVAL; 989 } 990 991 if (!info->fbops->fb_check_var) { 992 *var = info->var; 993 goto done; 994 } 995 996 ret = info->fbops->fb_check_var(var, info); 997 998 if (ret) 999 goto done; 1000 1001 if ((var->activate & FB_ACTIVATE_MASK) == FB_ACTIVATE_NOW) { 1002 struct fb_var_screeninfo old_var; 1003 struct fb_videomode mode; 1004 1005 if (info->fbops->fb_get_caps) { 1006 ret = fb_check_caps(info, var, activate); 1007 1008 if (ret) 1009 goto done; 1010 } 1011 1012 old_var = info->var; 1013 info->var = *var; 1014 1015 if (info->fbops->fb_set_par) { 1016 ret = info->fbops->fb_set_par(info); 1017 1018 if (ret) { 1019 info->var = old_var; 1020 printk(KERN_WARNING "detected " 1021 "fb_set_par error, " 1022 "error code: %d\n", ret); 1023 goto done; 1024 } 1025 } 1026 1027 fb_pan_display(info, &info->var); 1028 fb_set_cmap(&info->cmap, info); 1029 fb_var_to_videomode(&mode, &info->var); 1030 1031 if (info->modelist.prev && info->modelist.next && 1032 !list_empty(&info->modelist)) 1033 ret = fb_add_videomode(&mode, &info->modelist); 1034 1035 if (!ret && (flags & FBINFO_MISC_USEREVENT)) { 1036 struct fb_event event; 1037 int evnt = (activate & FB_ACTIVATE_ALL) ? 1038 FB_EVENT_MODE_CHANGE_ALL : 1039 FB_EVENT_MODE_CHANGE; 1040 1041 info->flags &= ~FBINFO_MISC_USEREVENT; 1042 event.info = info; 1043 event.data = &mode; 1044 fb_notifier_call_chain(evnt, &event); 1045 } 1046 } 1047 } 1048 1049 done: 1050 return ret; 1051 } 1052 EXPORT_SYMBOL(fb_set_var); 1053 1054 int 1055 fb_blank(struct fb_info *info, int blank) 1056 { 1057 struct fb_event event; 1058 int ret = -EINVAL, early_ret; 1059 1060 if (blank > FB_BLANK_POWERDOWN) 1061 blank = FB_BLANK_POWERDOWN; 1062 1063 event.info = info; 1064 event.data = ␣ 1065 1066 early_ret = fb_notifier_call_chain(FB_EARLY_EVENT_BLANK, &event); 1067 1068 if (info->fbops->fb_blank) 1069 ret = info->fbops->fb_blank(blank, info); 1070 1071 if (!ret) 1072 fb_notifier_call_chain(FB_EVENT_BLANK, &event); 1073 else { 1074 /* 1075 * if fb_blank is failed then revert effects of 1076 * the early blank event. 1077 */ 1078 if (!early_ret) 1079 fb_notifier_call_chain(FB_R_EARLY_EVENT_BLANK, &event); 1080 } 1081 1082 return ret; 1083 } 1084 EXPORT_SYMBOL(fb_blank); 1085 1086 static long do_fb_ioctl(struct fb_info *info, unsigned int cmd, 1087 unsigned long arg) 1088 { 1089 struct fb_ops *fb; 1090 struct fb_var_screeninfo var; 1091 struct fb_fix_screeninfo fix; 1092 struct fb_con2fbmap con2fb; 1093 struct fb_cmap cmap_from; 1094 struct fb_cmap_user cmap; 1095 struct fb_event event; 1096 void __user *argp = (void __user *)arg; 1097 long ret = 0; 1098 1099 switch (cmd) { 1100 case FBIOGET_VSCREENINFO: 1101 if (!lock_fb_info(info)) 1102 return -ENODEV; 1103 var = info->var; 1104 unlock_fb_info(info); 1105 1106 ret = copy_to_user(argp, &var, sizeof(var)) ? -EFAULT : 0; 1107 break; 1108 case FBIOPUT_VSCREENINFO: 1109 if (copy_from_user(&var, argp, sizeof(var))) 1110 return -EFAULT; 1111 console_lock(); 1112 if (!lock_fb_info(info)) { 1113 console_unlock(); 1114 return -ENODEV; 1115 } 1116 info->flags |= FBINFO_MISC_USEREVENT; 1117 ret = fb_set_var(info, &var); 1118 info->flags &= ~FBINFO_MISC_USEREVENT; 1119 unlock_fb_info(info); 1120 console_unlock(); 1121 if (!ret && copy_to_user(argp, &var, sizeof(var))) 1122 ret = -EFAULT; 1123 break; 1124 case FBIOGET_FSCREENINFO: 1125 if (!lock_fb_info(info)) 1126 return -ENODEV; 1127 fix = info->fix; 1128 unlock_fb_info(info); 1129 1130 ret = copy_to_user(argp, &fix, sizeof(fix)) ? -EFAULT : 0; 1131 break; 1132 case FBIOPUTCMAP: 1133 if (copy_from_user(&cmap, argp, sizeof(cmap))) 1134 return -EFAULT; 1135 ret = fb_set_user_cmap(&cmap, info); 1136 break; 1137 case FBIOGETCMAP: 1138 if (copy_from_user(&cmap, argp, sizeof(cmap))) 1139 return -EFAULT; 1140 if (!lock_fb_info(info)) 1141 return -ENODEV; 1142 cmap_from = info->cmap; 1143 unlock_fb_info(info); 1144 ret = fb_cmap_to_user(&cmap_from, &cmap); 1145 break; 1146 case FBIOPAN_DISPLAY: 1147 if (copy_from_user(&var, argp, sizeof(var))) 1148 return -EFAULT; 1149 console_lock(); 1150 if (!lock_fb_info(info)) { 1151 console_unlock(); 1152 return -ENODEV; 1153 } 1154 ret = fb_pan_display(info, &var); 1155 unlock_fb_info(info); 1156 console_unlock(); 1157 if (ret == 0 && copy_to_user(argp, &var, sizeof(var))) 1158 return -EFAULT; 1159 break; 1160 case FBIO_CURSOR: 1161 ret = -EINVAL; 1162 break; 1163 case FBIOGET_CON2FBMAP: 1164 if (copy_from_user(&con2fb, argp, sizeof(con2fb))) 1165 return -EFAULT; 1166 if (con2fb.console < 1 || con2fb.console > MAX_NR_CONSOLES) 1167 return -EINVAL; 1168 con2fb.framebuffer = -1; 1169 event.data = &con2fb; 1170 if (!lock_fb_info(info)) 1171 return -ENODEV; 1172 event.info = info; 1173 fb_notifier_call_chain(FB_EVENT_GET_CONSOLE_MAP, &event); 1174 unlock_fb_info(info); 1175 ret = copy_to_user(argp, &con2fb, sizeof(con2fb)) ? -EFAULT : 0; 1176 break; 1177 case FBIOPUT_CON2FBMAP: 1178 if (copy_from_user(&con2fb, argp, sizeof(con2fb))) 1179 return -EFAULT; 1180 if (con2fb.console < 1 || con2fb.console > MAX_NR_CONSOLES) 1181 return -EINVAL; 1182 if (con2fb.framebuffer < 0 || con2fb.framebuffer >= FB_MAX) 1183 return -EINVAL; 1184 if (!registered_fb[con2fb.framebuffer]) 1185 request_module("fb%d", con2fb.framebuffer); 1186 if (!registered_fb[con2fb.framebuffer]) { 1187 ret = -EINVAL; 1188 break; 1189 } 1190 event.data = &con2fb; 1191 console_lock(); 1192 if (!lock_fb_info(info)) { 1193 console_unlock(); 1194 return -ENODEV; 1195 } 1196 event.info = info; 1197 ret = fb_notifier_call_chain(FB_EVENT_SET_CONSOLE_MAP, &event); 1198 unlock_fb_info(info); 1199 console_unlock(); 1200 break; 1201 case FBIOBLANK: 1202 console_lock(); 1203 if (!lock_fb_info(info)) { 1204 console_unlock(); 1205 return -ENODEV; 1206 } 1207 info->flags |= FBINFO_MISC_USEREVENT; 1208 ret = fb_blank(info, arg); 1209 info->flags &= ~FBINFO_MISC_USEREVENT; 1210 unlock_fb_info(info); 1211 console_unlock(); 1212 break; 1213 default: 1214 if (!lock_fb_info(info)) 1215 return -ENODEV; 1216 fb = info->fbops; 1217 if (fb->fb_ioctl) 1218 ret = fb->fb_ioctl(info, cmd, arg); 1219 else 1220 ret = -ENOTTY; 1221 unlock_fb_info(info); 1222 } 1223 return ret; 1224 } 1225 1226 static long fb_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 1227 { 1228 struct fb_info *info = file_fb_info(file); 1229 1230 if (!info) 1231 return -ENODEV; 1232 return do_fb_ioctl(info, cmd, arg); 1233 } 1234 1235 #ifdef CONFIG_COMPAT 1236 struct fb_fix_screeninfo32 { 1237 char id[16]; 1238 compat_caddr_t smem_start; 1239 u32 smem_len; 1240 u32 type; 1241 u32 type_aux; 1242 u32 visual; 1243 u16 xpanstep; 1244 u16 ypanstep; 1245 u16 ywrapstep; 1246 u32 line_length; 1247 compat_caddr_t mmio_start; 1248 u32 mmio_len; 1249 u32 accel; 1250 u16 reserved[3]; 1251 }; 1252 1253 struct fb_cmap32 { 1254 u32 start; 1255 u32 len; 1256 compat_caddr_t red; 1257 compat_caddr_t green; 1258 compat_caddr_t blue; 1259 compat_caddr_t transp; 1260 }; 1261 1262 static int fb_getput_cmap(struct fb_info *info, unsigned int cmd, 1263 unsigned long arg) 1264 { 1265 struct fb_cmap_user __user *cmap; 1266 struct fb_cmap32 __user *cmap32; 1267 __u32 data; 1268 int err; 1269 1270 cmap = compat_alloc_user_space(sizeof(*cmap)); 1271 cmap32 = compat_ptr(arg); 1272 1273 if (copy_in_user(&cmap->start, &cmap32->start, 2 * sizeof(__u32))) 1274 return -EFAULT; 1275 1276 if (get_user(data, &cmap32->red) || 1277 put_user(compat_ptr(data), &cmap->red) || 1278 get_user(data, &cmap32->green) || 1279 put_user(compat_ptr(data), &cmap->green) || 1280 get_user(data, &cmap32->blue) || 1281 put_user(compat_ptr(data), &cmap->blue) || 1282 get_user(data, &cmap32->transp) || 1283 put_user(compat_ptr(data), &cmap->transp)) 1284 return -EFAULT; 1285 1286 err = do_fb_ioctl(info, cmd, (unsigned long) cmap); 1287 1288 if (!err) { 1289 if (copy_in_user(&cmap32->start, 1290 &cmap->start, 1291 2 * sizeof(__u32))) 1292 err = -EFAULT; 1293 } 1294 return err; 1295 } 1296 1297 static int do_fscreeninfo_to_user(struct fb_fix_screeninfo *fix, 1298 struct fb_fix_screeninfo32 __user *fix32) 1299 { 1300 __u32 data; 1301 int err; 1302 1303 err = copy_to_user(&fix32->id, &fix->id, sizeof(fix32->id)); 1304 1305 data = (__u32) (unsigned long) fix->smem_start; 1306 err |= put_user(data, &fix32->smem_start); 1307 1308 err |= put_user(fix->smem_len, &fix32->smem_len); 1309 err |= put_user(fix->type, &fix32->type); 1310 err |= put_user(fix->type_aux, &fix32->type_aux); 1311 err |= put_user(fix->visual, &fix32->visual); 1312 err |= put_user(fix->xpanstep, &fix32->xpanstep); 1313 err |= put_user(fix->ypanstep, &fix32->ypanstep); 1314 err |= put_user(fix->ywrapstep, &fix32->ywrapstep); 1315 err |= put_user(fix->line_length, &fix32->line_length); 1316 1317 data = (__u32) (unsigned long) fix->mmio_start; 1318 err |= put_user(data, &fix32->mmio_start); 1319 1320 err |= put_user(fix->mmio_len, &fix32->mmio_len); 1321 err |= put_user(fix->accel, &fix32->accel); 1322 err |= copy_to_user(fix32->reserved, fix->reserved, 1323 sizeof(fix->reserved)); 1324 1325 if (err) 1326 return -EFAULT; 1327 return 0; 1328 } 1329 1330 static int fb_get_fscreeninfo(struct fb_info *info, unsigned int cmd, 1331 unsigned long arg) 1332 { 1333 mm_segment_t old_fs; 1334 struct fb_fix_screeninfo fix; 1335 struct fb_fix_screeninfo32 __user *fix32; 1336 int err; 1337 1338 fix32 = compat_ptr(arg); 1339 1340 old_fs = get_fs(); 1341 set_fs(KERNEL_DS); 1342 err = do_fb_ioctl(info, cmd, (unsigned long) &fix); 1343 set_fs(old_fs); 1344 1345 if (!err) 1346 err = do_fscreeninfo_to_user(&fix, fix32); 1347 1348 return err; 1349 } 1350 1351 static long fb_compat_ioctl(struct file *file, unsigned int cmd, 1352 unsigned long arg) 1353 { 1354 struct fb_info *info = file_fb_info(file); 1355 struct fb_ops *fb; 1356 long ret = -ENOIOCTLCMD; 1357 1358 if (!info) 1359 return -ENODEV; 1360 fb = info->fbops; 1361 switch(cmd) { 1362 case FBIOGET_VSCREENINFO: 1363 case FBIOPUT_VSCREENINFO: 1364 case FBIOPAN_DISPLAY: 1365 case FBIOGET_CON2FBMAP: 1366 case FBIOPUT_CON2FBMAP: 1367 arg = (unsigned long) compat_ptr(arg); 1368 case FBIOBLANK: 1369 ret = do_fb_ioctl(info, cmd, arg); 1370 break; 1371 1372 case FBIOGET_FSCREENINFO: 1373 ret = fb_get_fscreeninfo(info, cmd, arg); 1374 break; 1375 1376 case FBIOGETCMAP: 1377 case FBIOPUTCMAP: 1378 ret = fb_getput_cmap(info, cmd, arg); 1379 break; 1380 1381 default: 1382 if (fb->fb_compat_ioctl) 1383 ret = fb->fb_compat_ioctl(info, cmd, arg); 1384 break; 1385 } 1386 return ret; 1387 } 1388 #endif 1389 1390 static int 1391 fb_mmap(struct file *file, struct vm_area_struct * vma) 1392 { 1393 struct fb_info *info = file_fb_info(file); 1394 struct fb_ops *fb; 1395 unsigned long mmio_pgoff; 1396 unsigned long start; 1397 u32 len; 1398 1399 if (!info) 1400 return -ENODEV; 1401 fb = info->fbops; 1402 if (!fb) 1403 return -ENODEV; 1404 mutex_lock(&info->mm_lock); 1405 if (fb->fb_mmap) { 1406 int res; 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 fb_pgprotect(file, vma, start); 1433 1434 return vm_iomap_memory(vma, start, len); 1435 } 1436 1437 static int 1438 fb_open(struct inode *inode, struct file *file) 1439 __acquires(&info->lock) 1440 __releases(&info->lock) 1441 { 1442 int fbidx = iminor(inode); 1443 struct fb_info *info; 1444 int res = 0; 1445 1446 info = get_fb_info(fbidx); 1447 if (!info) { 1448 request_module("fb%d", fbidx); 1449 info = get_fb_info(fbidx); 1450 if (!info) 1451 return -ENODEV; 1452 } 1453 if (IS_ERR(info)) 1454 return PTR_ERR(info); 1455 1456 mutex_lock(&info->lock); 1457 if (!try_module_get(info->fbops->owner)) { 1458 res = -ENODEV; 1459 goto out; 1460 } 1461 file->private_data = info; 1462 if (info->fbops->fb_open) { 1463 res = info->fbops->fb_open(info,1); 1464 if (res) 1465 module_put(info->fbops->owner); 1466 } 1467 #ifdef CONFIG_FB_DEFERRED_IO 1468 if (info->fbdefio) 1469 fb_deferred_io_open(info, inode, file); 1470 #endif 1471 out: 1472 mutex_unlock(&info->lock); 1473 if (res) 1474 put_fb_info(info); 1475 return res; 1476 } 1477 1478 static int 1479 fb_release(struct inode *inode, struct file *file) 1480 __acquires(&info->lock) 1481 __releases(&info->lock) 1482 { 1483 struct fb_info * const info = file->private_data; 1484 1485 mutex_lock(&info->lock); 1486 if (info->fbops->fb_release) 1487 info->fbops->fb_release(info,1); 1488 module_put(info->fbops->owner); 1489 mutex_unlock(&info->lock); 1490 put_fb_info(info); 1491 return 0; 1492 } 1493 1494 static const struct file_operations fb_fops = { 1495 .owner = THIS_MODULE, 1496 .read = fb_read, 1497 .write = fb_write, 1498 .unlocked_ioctl = fb_ioctl, 1499 #ifdef CONFIG_COMPAT 1500 .compat_ioctl = fb_compat_ioctl, 1501 #endif 1502 .mmap = fb_mmap, 1503 .open = fb_open, 1504 .release = fb_release, 1505 #ifdef HAVE_ARCH_FB_UNMAPPED_AREA 1506 .get_unmapped_area = get_fb_unmapped_area, 1507 #endif 1508 #ifdef CONFIG_FB_DEFERRED_IO 1509 .fsync = fb_deferred_io_fsync, 1510 #endif 1511 .llseek = default_llseek, 1512 }; 1513 1514 struct class *fb_class; 1515 EXPORT_SYMBOL(fb_class); 1516 1517 static int fb_check_foreignness(struct fb_info *fi) 1518 { 1519 const bool foreign_endian = fi->flags & FBINFO_FOREIGN_ENDIAN; 1520 1521 fi->flags &= ~FBINFO_FOREIGN_ENDIAN; 1522 1523 #ifdef __BIG_ENDIAN 1524 fi->flags |= foreign_endian ? 0 : FBINFO_BE_MATH; 1525 #else 1526 fi->flags |= foreign_endian ? FBINFO_BE_MATH : 0; 1527 #endif /* __BIG_ENDIAN */ 1528 1529 if (fi->flags & FBINFO_BE_MATH && !fb_be_math(fi)) { 1530 pr_err("%s: enable CONFIG_FB_BIG_ENDIAN to " 1531 "support this framebuffer\n", fi->fix.id); 1532 return -ENOSYS; 1533 } else if (!(fi->flags & FBINFO_BE_MATH) && fb_be_math(fi)) { 1534 pr_err("%s: enable CONFIG_FB_LITTLE_ENDIAN to " 1535 "support this framebuffer\n", fi->fix.id); 1536 return -ENOSYS; 1537 } 1538 1539 return 0; 1540 } 1541 1542 static bool apertures_overlap(struct aperture *gen, struct aperture *hw) 1543 { 1544 /* is the generic aperture base the same as the HW one */ 1545 if (gen->base == hw->base) 1546 return true; 1547 /* is the generic aperture base inside the hw base->hw base+size */ 1548 if (gen->base > hw->base && gen->base < hw->base + hw->size) 1549 return true; 1550 return false; 1551 } 1552 1553 static bool fb_do_apertures_overlap(struct apertures_struct *gena, 1554 struct apertures_struct *hwa) 1555 { 1556 int i, j; 1557 if (!hwa || !gena) 1558 return false; 1559 1560 for (i = 0; i < hwa->count; ++i) { 1561 struct aperture *h = &hwa->ranges[i]; 1562 for (j = 0; j < gena->count; ++j) { 1563 struct aperture *g = &gena->ranges[j]; 1564 printk(KERN_DEBUG "checking generic (%llx %llx) vs hw (%llx %llx)\n", 1565 (unsigned long long)g->base, 1566 (unsigned long long)g->size, 1567 (unsigned long long)h->base, 1568 (unsigned long long)h->size); 1569 if (apertures_overlap(g, h)) 1570 return true; 1571 } 1572 } 1573 1574 return false; 1575 } 1576 1577 static int do_unregister_framebuffer(struct fb_info *fb_info); 1578 1579 #define VGA_FB_PHYS 0xA0000 1580 static int do_remove_conflicting_framebuffers(struct apertures_struct *a, 1581 const char *name, bool primary) 1582 { 1583 int i, ret; 1584 1585 /* check all firmware fbs and kick off if the base addr overlaps */ 1586 for (i = 0 ; i < FB_MAX; i++) { 1587 struct apertures_struct *gen_aper; 1588 if (!registered_fb[i]) 1589 continue; 1590 1591 if (!(registered_fb[i]->flags & FBINFO_MISC_FIRMWARE)) 1592 continue; 1593 1594 gen_aper = registered_fb[i]->apertures; 1595 if (fb_do_apertures_overlap(gen_aper, a) || 1596 (primary && gen_aper && gen_aper->count && 1597 gen_aper->ranges[0].base == VGA_FB_PHYS)) { 1598 1599 printk(KERN_INFO "fb: switching to %s from %s\n", 1600 name, registered_fb[i]->fix.id); 1601 ret = do_unregister_framebuffer(registered_fb[i]); 1602 if (ret) 1603 return ret; 1604 } 1605 } 1606 1607 return 0; 1608 } 1609 1610 static int do_register_framebuffer(struct fb_info *fb_info) 1611 { 1612 int i, ret; 1613 struct fb_event event; 1614 struct fb_videomode mode; 1615 1616 if (fb_check_foreignness(fb_info)) 1617 return -ENOSYS; 1618 1619 ret = do_remove_conflicting_framebuffers(fb_info->apertures, 1620 fb_info->fix.id, 1621 fb_is_primary_device(fb_info)); 1622 if (ret) 1623 return ret; 1624 1625 if (num_registered_fb == FB_MAX) 1626 return -ENXIO; 1627 1628 num_registered_fb++; 1629 for (i = 0 ; i < FB_MAX; i++) 1630 if (!registered_fb[i]) 1631 break; 1632 fb_info->node = i; 1633 atomic_set(&fb_info->count, 1); 1634 mutex_init(&fb_info->lock); 1635 mutex_init(&fb_info->mm_lock); 1636 1637 fb_info->dev = device_create(fb_class, fb_info->device, 1638 MKDEV(FB_MAJOR, i), NULL, "fb%d", i); 1639 if (IS_ERR(fb_info->dev)) { 1640 /* Not fatal */ 1641 printk(KERN_WARNING "Unable to create device for framebuffer %d; errno = %ld\n", i, PTR_ERR(fb_info->dev)); 1642 fb_info->dev = NULL; 1643 } else 1644 fb_init_device(fb_info); 1645 1646 if (fb_info->pixmap.addr == NULL) { 1647 fb_info->pixmap.addr = kmalloc(FBPIXMAPSIZE, GFP_KERNEL); 1648 if (fb_info->pixmap.addr) { 1649 fb_info->pixmap.size = FBPIXMAPSIZE; 1650 fb_info->pixmap.buf_align = 1; 1651 fb_info->pixmap.scan_align = 1; 1652 fb_info->pixmap.access_align = 32; 1653 fb_info->pixmap.flags = FB_PIXMAP_DEFAULT; 1654 } 1655 } 1656 fb_info->pixmap.offset = 0; 1657 1658 if (!fb_info->pixmap.blit_x) 1659 fb_info->pixmap.blit_x = ~(u32)0; 1660 1661 if (!fb_info->pixmap.blit_y) 1662 fb_info->pixmap.blit_y = ~(u32)0; 1663 1664 if (!fb_info->modelist.prev || !fb_info->modelist.next) 1665 INIT_LIST_HEAD(&fb_info->modelist); 1666 1667 if (fb_info->skip_vt_switch) 1668 pm_vt_switch_required(fb_info->dev, false); 1669 else 1670 pm_vt_switch_required(fb_info->dev, true); 1671 1672 fb_var_to_videomode(&mode, &fb_info->var); 1673 fb_add_videomode(&mode, &fb_info->modelist); 1674 registered_fb[i] = fb_info; 1675 1676 event.info = fb_info; 1677 console_lock(); 1678 if (!lock_fb_info(fb_info)) { 1679 console_unlock(); 1680 return -ENODEV; 1681 } 1682 1683 fb_notifier_call_chain(FB_EVENT_FB_REGISTERED, &event); 1684 unlock_fb_info(fb_info); 1685 console_unlock(); 1686 return 0; 1687 } 1688 1689 static int do_unregister_framebuffer(struct fb_info *fb_info) 1690 { 1691 struct fb_event event; 1692 int i, ret = 0; 1693 1694 i = fb_info->node; 1695 if (i < 0 || i >= FB_MAX || registered_fb[i] != fb_info) 1696 return -EINVAL; 1697 1698 console_lock(); 1699 if (!lock_fb_info(fb_info)) { 1700 console_unlock(); 1701 return -ENODEV; 1702 } 1703 1704 event.info = fb_info; 1705 ret = fb_notifier_call_chain(FB_EVENT_FB_UNBIND, &event); 1706 unlock_fb_info(fb_info); 1707 console_unlock(); 1708 1709 if (ret) 1710 return -EINVAL; 1711 1712 pm_vt_switch_unregister(fb_info->dev); 1713 1714 unlink_framebuffer(fb_info); 1715 if (fb_info->pixmap.addr && 1716 (fb_info->pixmap.flags & FB_PIXMAP_DEFAULT)) 1717 kfree(fb_info->pixmap.addr); 1718 fb_destroy_modelist(&fb_info->modelist); 1719 registered_fb[i] = NULL; 1720 num_registered_fb--; 1721 fb_cleanup_device(fb_info); 1722 event.info = fb_info; 1723 console_lock(); 1724 fb_notifier_call_chain(FB_EVENT_FB_UNREGISTERED, &event); 1725 console_unlock(); 1726 1727 /* this may free fb info */ 1728 put_fb_info(fb_info); 1729 return 0; 1730 } 1731 1732 int unlink_framebuffer(struct fb_info *fb_info) 1733 { 1734 int i; 1735 1736 i = fb_info->node; 1737 if (i < 0 || i >= FB_MAX || registered_fb[i] != fb_info) 1738 return -EINVAL; 1739 1740 if (fb_info->dev) { 1741 device_destroy(fb_class, MKDEV(FB_MAJOR, i)); 1742 fb_info->dev = NULL; 1743 } 1744 return 0; 1745 } 1746 EXPORT_SYMBOL(unlink_framebuffer); 1747 1748 int remove_conflicting_framebuffers(struct apertures_struct *a, 1749 const char *name, bool primary) 1750 { 1751 int ret; 1752 1753 mutex_lock(®istration_lock); 1754 ret = do_remove_conflicting_framebuffers(a, name, primary); 1755 mutex_unlock(®istration_lock); 1756 1757 return ret; 1758 } 1759 EXPORT_SYMBOL(remove_conflicting_framebuffers); 1760 1761 /** 1762 * register_framebuffer - registers a frame buffer device 1763 * @fb_info: frame buffer info structure 1764 * 1765 * Registers a frame buffer device @fb_info. 1766 * 1767 * Returns negative errno on error, or zero for success. 1768 * 1769 */ 1770 int 1771 register_framebuffer(struct fb_info *fb_info) 1772 { 1773 int ret; 1774 1775 mutex_lock(®istration_lock); 1776 ret = do_register_framebuffer(fb_info); 1777 mutex_unlock(®istration_lock); 1778 1779 return ret; 1780 } 1781 EXPORT_SYMBOL(register_framebuffer); 1782 1783 /** 1784 * unregister_framebuffer - releases a frame buffer device 1785 * @fb_info: frame buffer info structure 1786 * 1787 * Unregisters a frame buffer device @fb_info. 1788 * 1789 * Returns negative errno on error, or zero for success. 1790 * 1791 * This function will also notify the framebuffer console 1792 * to release the driver. 1793 * 1794 * This is meant to be called within a driver's module_exit() 1795 * function. If this is called outside module_exit(), ensure 1796 * that the driver implements fb_open() and fb_release() to 1797 * check that no processes are using the device. 1798 */ 1799 int 1800 unregister_framebuffer(struct fb_info *fb_info) 1801 { 1802 int ret; 1803 1804 mutex_lock(®istration_lock); 1805 ret = do_unregister_framebuffer(fb_info); 1806 mutex_unlock(®istration_lock); 1807 1808 return ret; 1809 } 1810 EXPORT_SYMBOL(unregister_framebuffer); 1811 1812 /** 1813 * fb_set_suspend - low level driver signals suspend 1814 * @info: framebuffer affected 1815 * @state: 0 = resuming, !=0 = suspending 1816 * 1817 * This is meant to be used by low level drivers to 1818 * signal suspend/resume to the core & clients. 1819 * It must be called with the console semaphore held 1820 */ 1821 void fb_set_suspend(struct fb_info *info, int state) 1822 { 1823 struct fb_event event; 1824 1825 event.info = info; 1826 if (state) { 1827 fb_notifier_call_chain(FB_EVENT_SUSPEND, &event); 1828 info->state = FBINFO_STATE_SUSPENDED; 1829 } else { 1830 info->state = FBINFO_STATE_RUNNING; 1831 fb_notifier_call_chain(FB_EVENT_RESUME, &event); 1832 } 1833 } 1834 EXPORT_SYMBOL(fb_set_suspend); 1835 1836 /** 1837 * fbmem_init - init frame buffer subsystem 1838 * 1839 * Initialize the frame buffer subsystem. 1840 * 1841 * NOTE: This function is _only_ to be called by drivers/char/mem.c. 1842 * 1843 */ 1844 1845 static int __init 1846 fbmem_init(void) 1847 { 1848 proc_create("fb", 0, NULL, &fb_proc_fops); 1849 1850 if (register_chrdev(FB_MAJOR,"fb",&fb_fops)) 1851 printk("unable to get major %d for fb devs\n", FB_MAJOR); 1852 1853 fb_class = class_create(THIS_MODULE, "graphics"); 1854 if (IS_ERR(fb_class)) { 1855 printk(KERN_WARNING "Unable to create fb class; errno = %ld\n", PTR_ERR(fb_class)); 1856 fb_class = NULL; 1857 } 1858 return 0; 1859 } 1860 1861 #ifdef MODULE 1862 module_init(fbmem_init); 1863 static void __exit 1864 fbmem_exit(void) 1865 { 1866 remove_proc_entry("fb", NULL); 1867 class_destroy(fb_class); 1868 unregister_chrdev(FB_MAJOR, "fb"); 1869 } 1870 1871 module_exit(fbmem_exit); 1872 MODULE_LICENSE("GPL"); 1873 MODULE_DESCRIPTION("Framebuffer base"); 1874 #else 1875 subsys_initcall(fbmem_init); 1876 #endif 1877 1878 int fb_new_modelist(struct fb_info *info) 1879 { 1880 struct fb_event event; 1881 struct fb_var_screeninfo var = info->var; 1882 struct list_head *pos, *n; 1883 struct fb_modelist *modelist; 1884 struct fb_videomode *m, mode; 1885 int err = 1; 1886 1887 list_for_each_safe(pos, n, &info->modelist) { 1888 modelist = list_entry(pos, struct fb_modelist, list); 1889 m = &modelist->mode; 1890 fb_videomode_to_var(&var, m); 1891 var.activate = FB_ACTIVATE_TEST; 1892 err = fb_set_var(info, &var); 1893 fb_var_to_videomode(&mode, &var); 1894 if (err || !fb_mode_is_equal(m, &mode)) { 1895 list_del(pos); 1896 kfree(pos); 1897 } 1898 } 1899 1900 err = 1; 1901 1902 if (!list_empty(&info->modelist)) { 1903 event.info = info; 1904 err = fb_notifier_call_chain(FB_EVENT_NEW_MODELIST, &event); 1905 } 1906 1907 return err; 1908 } 1909 1910 static char *video_options[FB_MAX] __read_mostly; 1911 static int ofonly __read_mostly; 1912 1913 /** 1914 * fb_get_options - get kernel boot parameters 1915 * @name: framebuffer name as it would appear in 1916 * the boot parameter line 1917 * (video=<name>:<options>) 1918 * @option: the option will be stored here 1919 * 1920 * NOTE: Needed to maintain backwards compatibility 1921 */ 1922 int fb_get_options(const char *name, char **option) 1923 { 1924 char *opt, *options = NULL; 1925 int retval = 0; 1926 int name_len = strlen(name), i; 1927 1928 if (name_len && ofonly && strncmp(name, "offb", 4)) 1929 retval = 1; 1930 1931 if (name_len && !retval) { 1932 for (i = 0; i < FB_MAX; i++) { 1933 if (video_options[i] == NULL) 1934 continue; 1935 if (!video_options[i][0]) 1936 continue; 1937 opt = video_options[i]; 1938 if (!strncmp(name, opt, name_len) && 1939 opt[name_len] == ':') 1940 options = opt + name_len + 1; 1941 } 1942 } 1943 /* No match, pass global option */ 1944 if (!options && option && fb_mode_option) 1945 options = kstrdup(fb_mode_option, GFP_KERNEL); 1946 if (options && !strncmp(options, "off", 3)) 1947 retval = 1; 1948 1949 if (option) 1950 *option = options; 1951 1952 return retval; 1953 } 1954 EXPORT_SYMBOL(fb_get_options); 1955 1956 #ifndef MODULE 1957 /** 1958 * video_setup - process command line options 1959 * @options: string of options 1960 * 1961 * Process command line options for frame buffer subsystem. 1962 * 1963 * NOTE: This function is a __setup and __init function. 1964 * It only stores the options. Drivers have to call 1965 * fb_get_options() as necessary. 1966 * 1967 * Returns zero. 1968 * 1969 */ 1970 static int __init video_setup(char *options) 1971 { 1972 int i, global = 0; 1973 1974 if (!options || !*options) 1975 global = 1; 1976 1977 if (!global && !strncmp(options, "ofonly", 6)) { 1978 ofonly = 1; 1979 global = 1; 1980 } 1981 1982 if (!global && !strchr(options, ':')) { 1983 fb_mode_option = options; 1984 global = 1; 1985 } 1986 1987 if (!global) { 1988 for (i = 0; i < FB_MAX; i++) { 1989 if (video_options[i] == NULL) { 1990 video_options[i] = options; 1991 break; 1992 } 1993 1994 } 1995 } 1996 1997 return 1; 1998 } 1999 __setup("video=", video_setup); 2000 #endif 2001 2002 MODULE_LICENSE("GPL"); 2003