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/smp_lock.h> 20#include <linux/kernel.h> 21#include <linux/major.h> 22#include <linux/slab.h> 23#include <linux/mm.h> 24#include <linux/mman.h> 25#include <linux/vt.h> 26#include <linux/init.h> 27#include <linux/linux_logo.h> 28#include <linux/proc_fs.h> 29#include <linux/console.h> 30#ifdef CONFIG_KMOD 31#include <linux/kmod.h> 32#endif 33#include <linux/err.h> 34#include <linux/device.h> 35#include <linux/efi.h> 36 37#if defined(__mc68000__) || defined(CONFIG_APUS) 38#include <asm/setup.h> 39#endif 40 41#include <asm/io.h> 42#include <asm/uaccess.h> 43#include <asm/page.h> 44#include <asm/pgtable.h> 45 46#include <linux/fb.h> 47 48 /* 49 * Frame buffer device initialization and setup routines 50 */ 51 52#define FBPIXMAPSIZE (1024 * 8) 53 54struct fb_info *registered_fb[FB_MAX] __read_mostly; 55int num_registered_fb __read_mostly; 56 57/* 58 * Helpers 59 */ 60 61int fb_get_color_depth(struct fb_var_screeninfo *var, 62 struct fb_fix_screeninfo *fix) 63{ 64 int depth = 0; 65 66 if (fix->visual == FB_VISUAL_MONO01 || 67 fix->visual == FB_VISUAL_MONO10) 68 depth = 1; 69 else { 70 if (var->green.length == var->blue.length && 71 var->green.length == var->red.length && 72 var->green.offset == var->blue.offset && 73 var->green.offset == var->red.offset) 74 depth = var->green.length; 75 else 76 depth = var->green.length + var->red.length + 77 var->blue.length; 78 } 79 80 return depth; 81} 82EXPORT_SYMBOL(fb_get_color_depth); 83 84/* 85 * Data padding functions. 86 */ 87void fb_pad_aligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 s_pitch, u32 height) 88{ 89 __fb_pad_aligned_buffer(dst, d_pitch, src, s_pitch, height); 90} 91EXPORT_SYMBOL(fb_pad_aligned_buffer); 92 93void fb_pad_unaligned_buffer(u8 *dst, u32 d_pitch, u8 *src, u32 idx, u32 height, 94 u32 shift_high, u32 shift_low, u32 mod) 95{ 96 u8 mask = (u8) (0xfff << shift_high), tmp; 97 int i, j; 98 99 for (i = height; i--; ) { 100 for (j = 0; j < idx; j++) { 101 tmp = dst[j]; 102 tmp &= mask; 103 tmp |= *src >> shift_low; 104 dst[j] = tmp; 105 tmp = *src << shift_high; 106 dst[j+1] = tmp; 107 src++; 108 } 109 tmp = dst[idx]; 110 tmp &= mask; 111 tmp |= *src >> shift_low; 112 dst[idx] = tmp; 113 if (shift_high < mod) { 114 tmp = *src << shift_high; 115 dst[idx+1] = tmp; 116 } 117 src++; 118 dst += d_pitch; 119 } 120} 121EXPORT_SYMBOL(fb_pad_unaligned_buffer); 122 123/* 124 * we need to lock this section since fb_cursor 125 * may use fb_imageblit() 126 */ 127char* fb_get_buffer_offset(struct fb_info *info, struct fb_pixmap *buf, u32 size) 128{ 129 u32 align = buf->buf_align - 1, offset; 130 char *addr = buf->addr; 131 132 /* If IO mapped, we need to sync before access, no sharing of 133 * the pixmap is done 134 */ 135 if (buf->flags & FB_PIXMAP_IO) { 136 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC)) 137 info->fbops->fb_sync(info); 138 return addr; 139 } 140 141 /* See if we fit in the remaining pixmap space */ 142 offset = buf->offset + align; 143 offset &= ~align; 144 if (offset + size > buf->size) { 145 /* We do not fit. In order to be able to re-use the buffer, 146 * we must ensure no asynchronous DMA'ing or whatever operation 147 * is in progress, we sync for that. 148 */ 149 if (info->fbops->fb_sync && (buf->flags & FB_PIXMAP_SYNC)) 150 info->fbops->fb_sync(info); 151 offset = 0; 152 } 153 buf->offset = offset + size; 154 addr += offset; 155 156 return addr; 157} 158 159#ifdef CONFIG_LOGO 160 161static inline unsigned safe_shift(unsigned d, int n) 162{ 163 return n < 0 ? d >> -n : d << n; 164} 165 166static void fb_set_logocmap(struct fb_info *info, 167 const struct linux_logo *logo) 168{ 169 struct fb_cmap palette_cmap; 170 u16 palette_green[16]; 171 u16 palette_blue[16]; 172 u16 palette_red[16]; 173 int i, j, n; 174 const unsigned char *clut = logo->clut; 175 176 palette_cmap.start = 0; 177 palette_cmap.len = 16; 178 palette_cmap.red = palette_red; 179 palette_cmap.green = palette_green; 180 palette_cmap.blue = palette_blue; 181 palette_cmap.transp = NULL; 182 183 for (i = 0; i < logo->clutsize; i += n) { 184 n = logo->clutsize - i; 185 /* palette_cmap provides space for only 16 colors at once */ 186 if (n > 16) 187 n = 16; 188 palette_cmap.start = 32 + i; 189 palette_cmap.len = n; 190 for (j = 0; j < n; ++j) { 191 palette_cmap.red[j] = clut[0] << 8 | clut[0]; 192 palette_cmap.green[j] = clut[1] << 8 | clut[1]; 193 palette_cmap.blue[j] = clut[2] << 8 | clut[2]; 194 clut += 3; 195 } 196 fb_set_cmap(&palette_cmap, info); 197 } 198} 199 200static void fb_set_logo_truepalette(struct fb_info *info, 201 const struct linux_logo *logo, 202 u32 *palette) 203{ 204 static const unsigned char mask[] = { 0,0x80,0xc0,0xe0,0xf0,0xf8,0xfc,0xfe,0xff }; 205 unsigned char redmask, greenmask, bluemask; 206 int redshift, greenshift, blueshift; 207 int i; 208 const unsigned char *clut = logo->clut; 209 210 /* 211 * We have to create a temporary palette since console palette is only 212 * 16 colors long. 213 */ 214 /* Bug: Doesn't obey msb_right ... (who needs that?) */ 215 redmask = mask[info->var.red.length < 8 ? info->var.red.length : 8]; 216 greenmask = mask[info->var.green.length < 8 ? info->var.green.length : 8]; 217 bluemask = mask[info->var.blue.length < 8 ? info->var.blue.length : 8]; 218 redshift = info->var.red.offset - (8 - info->var.red.length); 219 greenshift = info->var.green.offset - (8 - info->var.green.length); 220 blueshift = info->var.blue.offset - (8 - info->var.blue.length); 221 222 for ( i = 0; i < logo->clutsize; i++) { 223 palette[i+32] = (safe_shift((clut[0] & redmask), redshift) | 224 safe_shift((clut[1] & greenmask), greenshift) | 225 safe_shift((clut[2] & bluemask), blueshift)); 226 clut += 3; 227 } 228} 229 230static void fb_set_logo_directpalette(struct fb_info *info, 231 const struct linux_logo *logo, 232 u32 *palette) 233{ 234 int redshift, greenshift, blueshift; 235 int i; 236 237 redshift = info->var.red.offset; 238 greenshift = info->var.green.offset; 239 blueshift = info->var.blue.offset; 240 241 for (i = 32; i < logo->clutsize; i++) 242 palette[i] = i << redshift | i << greenshift | i << blueshift; 243} 244 245static void fb_set_logo(struct fb_info *info, 246 const struct linux_logo *logo, u8 *dst, 247 int depth) 248{ 249 int i, j, k; 250 const u8 *src = logo->data; 251 u8 xor = (info->fix.visual == FB_VISUAL_MONO01) ? 0xff : 0; 252 u8 fg = 1, d; 253 254 if (fb_get_color_depth(&info->var, &info->fix) == 3) 255 fg = 7; 256 257 if (info->fix.visual == FB_VISUAL_MONO01 || 258 info->fix.visual == FB_VISUAL_MONO10) 259 fg = ~((u8) (0xfff << info->var.green.length)); 260 261 switch (depth) { 262 case 4: 263 for (i = 0; i < logo->height; i++) 264 for (j = 0; j < logo->width; src++) { 265 *dst++ = *src >> 4; 266 j++; 267 if (j < logo->width) { 268 *dst++ = *src & 0x0f; 269 j++; 270 } 271 } 272 break; 273 case 1: 274 for (i = 0; i < logo->height; i++) { 275 for (j = 0; j < logo->width; src++) { 276 d = *src ^ xor; 277 for (k = 7; k >= 0; k--) { 278 *dst++ = ((d >> k) & 1) ? fg : 0; 279 j++; 280 } 281 } 282 } 283 break; 284 } 285} 286 287/* 288 * Three (3) kinds of logo maps exist. linux_logo_clut224 (>16 colors), 289 * linux_logo_vga16 (16 colors) and linux_logo_mono (2 colors). Depending on 290 * the visual format and color depth of the framebuffer, the DAC, the 291 * pseudo_palette, and the logo data will be adjusted accordingly. 292 * 293 * Case 1 - linux_logo_clut224: 294 * Color exceeds the number of console colors (16), thus we set the hardware DAC 295 * using fb_set_cmap() appropriately. The "needs_cmapreset" flag will be set. 296 * 297 * For visuals that require color info from the pseudo_palette, we also construct 298 * one for temporary use. The "needs_directpalette" or "needs_truepalette" flags 299 * will be set. 300 * 301 * Case 2 - linux_logo_vga16: 302 * The number of colors just matches the console colors, thus there is no need 303 * to set the DAC or the pseudo_palette. However, the bitmap is packed, ie, 304 * each byte contains color information for two pixels (upper and lower nibble). 305 * To be consistent with fb_imageblit() usage, we therefore separate the two 306 * nibbles into separate bytes. The "depth" flag will be set to 4. 307 * 308 * Case 3 - linux_logo_mono: 309 * This is similar with Case 2. Each byte contains information for 8 pixels. 310 * We isolate each bit and expand each into a byte. The "depth" flag will 311 * be set to 1. 312 */ 313static struct logo_data { 314 int depth; 315 int needs_directpalette; 316 int needs_truepalette; 317 int needs_cmapreset; 318 const struct linux_logo *logo; 319} fb_logo __read_mostly; 320 321static void fb_rotate_logo_ud(const u8 *in, u8 *out, u32 width, u32 height) 322{ 323 u32 size = width * height, i; 324 325 out += size - 1; 326 327 for (i = size; i--; ) 328 *out-- = *in++; 329} 330 331static void fb_rotate_logo_cw(const u8 *in, u8 *out, u32 width, u32 height) 332{ 333 int i, j, h = height - 1; 334 335 for (i = 0; i < height; i++) 336 for (j = 0; j < width; j++) 337 out[height * j + h - i] = *in++; 338} 339 340static void fb_rotate_logo_ccw(const u8 *in, u8 *out, u32 width, u32 height) 341{ 342 int i, j, w = width - 1; 343 344 for (i = 0; i < height; i++) 345 for (j = 0; j < width; j++) 346 out[height * (w - j) + i] = *in++; 347} 348 349static void fb_rotate_logo(struct fb_info *info, u8 *dst, 350 struct fb_image *image, int rotate) 351{ 352 u32 tmp; 353 354 if (rotate == FB_ROTATE_UD) { 355 fb_rotate_logo_ud(image->data, dst, image->width, 356 image->height); 357 image->dx = info->var.xres - image->width - image->dx; 358 image->dy = info->var.yres - image->height - image->dy; 359 } else if (rotate == FB_ROTATE_CW) { 360 fb_rotate_logo_cw(image->data, dst, image->width, 361 image->height); 362 tmp = image->width; 363 image->width = image->height; 364 image->height = tmp; 365 tmp = image->dy; 366 image->dy = image->dx; 367 image->dx = info->var.xres - image->width - tmp; 368 } else if (rotate == FB_ROTATE_CCW) { 369 fb_rotate_logo_ccw(image->data, dst, image->width, 370 image->height); 371 tmp = image->width; 372 image->width = image->height; 373 image->height = tmp; 374 tmp = image->dx; 375 image->dx = image->dy; 376 image->dy = info->var.yres - image->height - tmp; 377 } 378 379 image->data = dst; 380} 381 382static void fb_do_show_logo(struct fb_info *info, struct fb_image *image, 383 int rotate, unsigned int num) 384{ 385 unsigned int x; 386 387 if (rotate == FB_ROTATE_UR) { 388 for (x = 0; 389 x < num && image->dx + image->width <= info->var.xres; 390 x++) { 391 info->fbops->fb_imageblit(info, image); 392 image->dx += image->width + 8; 393 } 394 } else if (rotate == FB_ROTATE_UD) { 395 for (x = 0; x < num && image->dx >= 0; x++) { 396 info->fbops->fb_imageblit(info, image); 397 image->dx -= image->width + 8; 398 } 399 } else if (rotate == FB_ROTATE_CW) { 400 for (x = 0; 401 x < num && image->dy + image->height <= info->var.yres; 402 x++) { 403 info->fbops->fb_imageblit(info, image); 404 image->dy += image->height + 8; 405 } 406 } else if (rotate == FB_ROTATE_CCW) { 407 for (x = 0; x < num && image->dy >= 0; x++) { 408 info->fbops->fb_imageblit(info, image); 409 image->dy -= image->height + 8; 410 } 411 } 412} 413 414int fb_prepare_logo(struct fb_info *info, int rotate) 415{ 416 int depth = fb_get_color_depth(&info->var, &info->fix); 417 int yres; 418 419 memset(&fb_logo, 0, sizeof(struct logo_data)); 420 421 if (info->flags & FBINFO_MISC_TILEBLITTING || 422 info->flags & FBINFO_MODULE) 423 return 0; 424 425 if (info->fix.visual == FB_VISUAL_DIRECTCOLOR) { 426 depth = info->var.blue.length; 427 if (info->var.red.length < depth) 428 depth = info->var.red.length; 429 if (info->var.green.length < depth) 430 depth = info->var.green.length; 431 } 432 433 if (info->fix.visual == FB_VISUAL_STATIC_PSEUDOCOLOR && depth > 4) { 434 /* assume console colormap */ 435 depth = 4; 436 } 437 438 if (depth >= 8) { 439 switch (info->fix.visual) { 440 case FB_VISUAL_TRUECOLOR: 441 fb_logo.needs_truepalette = 1; 442 break; 443 case FB_VISUAL_DIRECTCOLOR: 444 fb_logo.needs_directpalette = 1; 445 fb_logo.needs_cmapreset = 1; 446 break; 447 case FB_VISUAL_PSEUDOCOLOR: 448 fb_logo.needs_cmapreset = 1; 449 break; 450 } 451 } 452 453 /* Return if no suitable logo was found */ 454 fb_logo.logo = fb_find_logo(depth); 455 456 if (!fb_logo.logo) { 457 return 0; 458 } 459 460 if (rotate == FB_ROTATE_UR || rotate == FB_ROTATE_UD) 461 yres = info->var.yres; 462 else 463 yres = info->var.xres; 464 465 if (fb_logo.logo->height > yres) { 466 fb_logo.logo = NULL; 467 return 0; 468 } 469 470 /* What depth we asked for might be different from what we get */ 471 if (fb_logo.logo->type == LINUX_LOGO_CLUT224) 472 fb_logo.depth = 8; 473 else if (fb_logo.logo->type == LINUX_LOGO_VGA16) 474 fb_logo.depth = 4; 475 else 476 fb_logo.depth = 1; 477 return fb_logo.logo->height; 478} 479 480int fb_show_logo(struct fb_info *info, int rotate) 481{ 482 u32 *palette = NULL, *saved_pseudo_palette = NULL; 483 unsigned char *logo_new = NULL, *logo_rotate = NULL; 484 struct fb_image image; 485 486 /* Return if the frame buffer is not mapped or suspended */ 487 if (fb_logo.logo == NULL || info->state != FBINFO_STATE_RUNNING || 488 info->flags & FBINFO_MODULE) 489 return 0; 490 491 image.depth = 8; 492 image.data = fb_logo.logo->data; 493 494 if (fb_logo.needs_cmapreset) 495 fb_set_logocmap(info, fb_logo.logo); 496 497 if (fb_logo.needs_truepalette || 498 fb_logo.needs_directpalette) { 499 palette = kmalloc(256 * 4, GFP_KERNEL); 500 if (palette == NULL) 501 return 0; 502 503 if (fb_logo.needs_truepalette) 504 fb_set_logo_truepalette(info, fb_logo.logo, palette); 505 else 506 fb_set_logo_directpalette(info, fb_logo.logo, palette); 507 508 saved_pseudo_palette = info->pseudo_palette; 509 info->pseudo_palette = palette; 510 } 511 512 if (fb_logo.depth <= 4) { 513 logo_new = kmalloc(fb_logo.logo->width * fb_logo.logo->height, 514 GFP_KERNEL); 515 if (logo_new == NULL) { 516 kfree(palette); 517 if (saved_pseudo_palette) 518 info->pseudo_palette = saved_pseudo_palette; 519 return 0; 520 } 521 image.data = logo_new; 522 fb_set_logo(info, fb_logo.logo, logo_new, fb_logo.depth); 523 } 524 525 image.dx = 0; 526 image.dy = 0; 527 image.width = fb_logo.logo->width; 528 image.height = fb_logo.logo->height; 529 530 if (rotate) { 531 logo_rotate = kmalloc(fb_logo.logo->width * 532 fb_logo.logo->height, GFP_KERNEL); 533 if (logo_rotate) 534 fb_rotate_logo(info, logo_rotate, &image, rotate); 535 } 536 537 fb_do_show_logo(info, &image, rotate, num_online_cpus()); 538 539 kfree(palette); 540 if (saved_pseudo_palette != NULL) 541 info->pseudo_palette = saved_pseudo_palette; 542 kfree(logo_new); 543 kfree(logo_rotate); 544 return fb_logo.logo->height; 545} 546#else 547int fb_prepare_logo(struct fb_info *info, int rotate) { return 0; } 548int fb_show_logo(struct fb_info *info, int rotate) { return 0; } 549#endif /* CONFIG_LOGO */ 550 551static int fbmem_read_proc(char *buf, char **start, off_t offset, 552 int len, int *eof, void *private) 553{ 554 struct fb_info **fi; 555 int clen; 556 557 clen = 0; 558 for (fi = registered_fb; fi < ®istered_fb[FB_MAX] && clen < 4000; 559 fi++) 560 if (*fi) 561 clen += sprintf(buf + clen, "%d %s\n", 562 (*fi)->node, 563 (*fi)->fix.id); 564 *start = buf + offset; 565 if (clen > offset) 566 clen -= offset; 567 else 568 clen = 0; 569 return clen < len ? clen : len; 570} 571 572static ssize_t 573fb_read(struct file *file, char __user *buf, size_t count, loff_t *ppos) 574{ 575 unsigned long p = *ppos; 576 struct inode *inode = file->f_path.dentry->d_inode; 577 int fbidx = iminor(inode); 578 struct fb_info *info = registered_fb[fbidx]; 579 u32 *buffer, *dst; 580 u32 __iomem *src; 581 int c, i, cnt = 0, err = 0; 582 unsigned long total_size; 583 584 if (!info || ! info->screen_base) 585 return -ENODEV; 586 587 if (info->state != FBINFO_STATE_RUNNING) 588 return -EPERM; 589 590 if (info->fbops->fb_read) 591 return info->fbops->fb_read(info, buf, count, ppos); 592 593 total_size = info->screen_size; 594 595 if (total_size == 0) 596 total_size = info->fix.smem_len; 597 598 if (p >= total_size) 599 return 0; 600 601 if (count >= total_size) 602 count = total_size; 603 604 if (count + p > total_size) 605 count = total_size - p; 606 607 buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count, 608 GFP_KERNEL); 609 if (!buffer) 610 return -ENOMEM; 611 612 src = (u32 __iomem *) (info->screen_base + p); 613 614 if (info->fbops->fb_sync) 615 info->fbops->fb_sync(info); 616 617 while (count) { 618 c = (count > PAGE_SIZE) ? PAGE_SIZE : count; 619 dst = buffer; 620 for (i = c >> 2; i--; ) 621 *dst++ = fb_readl(src++); 622 if (c & 3) { 623 u8 *dst8 = (u8 *) dst; 624 u8 __iomem *src8 = (u8 __iomem *) src; 625 626 for (i = c & 3; i--;) 627 *dst8++ = fb_readb(src8++); 628 629 src = (u32 __iomem *) src8; 630 } 631 632 if (copy_to_user(buf, buffer, c)) { 633 err = -EFAULT; 634 break; 635 } 636 *ppos += c; 637 buf += c; 638 cnt += c; 639 count -= c; 640 } 641 642 kfree(buffer); 643 644 return (err) ? err : cnt; 645} 646 647static ssize_t 648fb_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos) 649{ 650 unsigned long p = *ppos; 651 struct inode *inode = file->f_path.dentry->d_inode; 652 int fbidx = iminor(inode); 653 struct fb_info *info = registered_fb[fbidx]; 654 u32 *buffer, *src; 655 u32 __iomem *dst; 656 int c, i, cnt = 0, err = 0; 657 unsigned long total_size; 658 659 if (!info || !info->screen_base) 660 return -ENODEV; 661 662 if (info->state != FBINFO_STATE_RUNNING) 663 return -EPERM; 664 665 if (info->fbops->fb_write) 666 return info->fbops->fb_write(info, buf, count, ppos); 667 668 total_size = info->screen_size; 669 670 if (total_size == 0) 671 total_size = info->fix.smem_len; 672 673 if (p > total_size) 674 return -EFBIG; 675 676 if (count > total_size) { 677 err = -EFBIG; 678 count = total_size; 679 } 680 681 if (count + p > total_size) { 682 if (!err) 683 err = -ENOSPC; 684 685 count = total_size - p; 686 } 687 688 buffer = kmalloc((count > PAGE_SIZE) ? PAGE_SIZE : count, 689 GFP_KERNEL); 690 if (!buffer) 691 return -ENOMEM; 692 693 dst = (u32 __iomem *) (info->screen_base + p); 694 695 if (info->fbops->fb_sync) 696 info->fbops->fb_sync(info); 697 698 while (count) { 699 c = (count > PAGE_SIZE) ? PAGE_SIZE : count; 700 src = buffer; 701 702 if (copy_from_user(src, buf, c)) { 703 err = -EFAULT; 704 break; 705 } 706 707 for (i = c >> 2; i--; ) 708 fb_writel(*src++, dst++); 709 710 if (c & 3) { 711 u8 *src8 = (u8 *) src; 712 u8 __iomem *dst8 = (u8 __iomem *) dst; 713 714 for (i = c & 3; i--; ) 715 fb_writeb(*src8++, dst8++); 716 717 dst = (u32 __iomem *) dst8; 718 } 719 720 *ppos += c; 721 buf += c; 722 cnt += c; 723 count -= c; 724 } 725 726 kfree(buffer); 727 728 return (cnt) ? cnt : err; 729} 730 731#ifdef CONFIG_KMOD 732static void try_to_load(int fb) 733{ 734 request_module("fb%d", fb); 735} 736#endif /* CONFIG_KMOD */ 737 738int 739fb_pan_display(struct fb_info *info, struct fb_var_screeninfo *var) 740{ 741 struct fb_fix_screeninfo *fix = &info->fix; 742 int xoffset = var->xoffset; 743 int yoffset = var->yoffset; 744 int err = 0, yres = info->var.yres; 745 746 if (var->yoffset > 0) { 747 if (var->vmode & FB_VMODE_YWRAP) { 748 if (!fix->ywrapstep || (var->yoffset % fix->ywrapstep)) 749 err = -EINVAL; 750 else 751 yres = 0; 752 } else if (!fix->ypanstep || (var->yoffset % fix->ypanstep)) 753 err = -EINVAL; 754 } 755 756 if (var->xoffset > 0 && (!fix->xpanstep || 757 (var->xoffset % fix->xpanstep))) 758 err = -EINVAL; 759 760 if (err || !info->fbops->fb_pan_display || xoffset < 0 || 761 yoffset < 0 || var->yoffset + yres > info->var.yres_virtual || 762 var->xoffset + info->var.xres > info->var.xres_virtual) 763 return -EINVAL; 764 765 if ((err = info->fbops->fb_pan_display(var, info))) 766 return err; 767 info->var.xoffset = var->xoffset; 768 info->var.yoffset = var->yoffset; 769 if (var->vmode & FB_VMODE_YWRAP) 770 info->var.vmode |= FB_VMODE_YWRAP; 771 else 772 info->var.vmode &= ~FB_VMODE_YWRAP; 773 return 0; 774} 775 776static int fb_check_caps(struct fb_info *info, struct fb_var_screeninfo *var, 777 u32 activate) 778{ 779 struct fb_event event; 780 struct fb_blit_caps caps, fbcaps; 781 int err = 0; 782 783 memset(&caps, 0, sizeof(caps)); 784 memset(&fbcaps, 0, sizeof(fbcaps)); 785 caps.flags = (activate & FB_ACTIVATE_ALL) ? 1 : 0; 786 event.info = info; 787 event.data = ∩︀ 788 fb_notifier_call_chain(FB_EVENT_GET_REQ, &event); 789 info->fbops->fb_get_caps(info, &fbcaps, var); 790 791 if (((fbcaps.x ^ caps.x) & caps.x) || 792 ((fbcaps.y ^ caps.y) & caps.y) || 793 (fbcaps.len < caps.len)) 794 err = -EINVAL; 795 796 return err; 797} 798 799int 800fb_set_var(struct fb_info *info, struct fb_var_screeninfo *var) 801{ 802 int flags = info->flags; 803 int ret = 0; 804 805 if (var->activate & FB_ACTIVATE_INV_MODE) { 806 struct fb_videomode mode1, mode2; 807 808 fb_var_to_videomode(&mode1, var); 809 fb_var_to_videomode(&mode2, &info->var); 810 /* make sure we don't delete the videomode of current var */ 811 ret = fb_mode_is_equal(&mode1, &mode2); 812 813 if (!ret) { 814 struct fb_event event; 815 816 event.info = info; 817 event.data = &mode1; 818 ret = fb_notifier_call_chain(FB_EVENT_MODE_DELETE, &event); 819 } 820 821 if (!ret) 822 fb_delete_videomode(&mode1, &info->modelist); 823 824 825 ret = (ret) ? -EINVAL : 0; 826 goto done; 827 } 828 829 if ((var->activate & FB_ACTIVATE_FORCE) || 830 memcmp(&info->var, var, sizeof(struct fb_var_screeninfo))) { 831 u32 activate = var->activate; 832 833 if (!info->fbops->fb_check_var) { 834 *var = info->var; 835 goto done; 836 } 837 838 ret = info->fbops->fb_check_var(var, info); 839 840 if (ret) 841 goto done; 842 843 if ((var->activate & FB_ACTIVATE_MASK) == FB_ACTIVATE_NOW) { 844 struct fb_videomode mode; 845 846 if (info->fbops->fb_get_caps) { 847 ret = fb_check_caps(info, var, activate); 848 849 if (ret) 850 goto done; 851 } 852 853 info->var = *var; 854 855 if (info->fbops->fb_set_par) 856 info->fbops->fb_set_par(info); 857 858 fb_pan_display(info, &info->var); 859 fb_set_cmap(&info->cmap, info); 860 fb_var_to_videomode(&mode, &info->var); 861 862 if (info->modelist.prev && info->modelist.next && 863 !list_empty(&info->modelist)) 864 ret = fb_add_videomode(&mode, &info->modelist); 865 866 if (!ret && (flags & FBINFO_MISC_USEREVENT)) { 867 struct fb_event event; 868 int evnt = (activate & FB_ACTIVATE_ALL) ? 869 FB_EVENT_MODE_CHANGE_ALL : 870 FB_EVENT_MODE_CHANGE; 871 872 info->flags &= ~FBINFO_MISC_USEREVENT; 873 event.info = info; 874 fb_notifier_call_chain(evnt, &event); 875 } 876 } 877 } 878 879 done: 880 return ret; 881} 882 883int 884fb_blank(struct fb_info *info, int blank) 885{ 886 int ret = -EINVAL; 887 888 if (blank > FB_BLANK_POWERDOWN) 889 blank = FB_BLANK_POWERDOWN; 890 891 if (info->fbops->fb_blank) 892 ret = info->fbops->fb_blank(blank, info); 893 894 if (!ret) { 895 struct fb_event event; 896 897 event.info = info; 898 event.data = ␣ 899 fb_notifier_call_chain(FB_EVENT_BLANK, &event); 900 } 901 902 return ret; 903} 904 905static int 906fb_ioctl(struct inode *inode, struct file *file, unsigned int cmd, 907 unsigned long arg) 908{ 909 int fbidx = iminor(inode); 910 struct fb_info *info = registered_fb[fbidx]; 911 struct fb_ops *fb = info->fbops; 912 struct fb_var_screeninfo var; 913 struct fb_fix_screeninfo fix; 914 struct fb_con2fbmap con2fb; 915 struct fb_cmap_user cmap; 916 struct fb_event event; 917 void __user *argp = (void __user *)arg; 918 int i; 919 920 if (!fb) 921 return -ENODEV; 922 switch (cmd) { 923 case FBIOGET_VSCREENINFO: 924 return copy_to_user(argp, &info->var, 925 sizeof(var)) ? -EFAULT : 0; 926 case FBIOPUT_VSCREENINFO: 927 if (copy_from_user(&var, argp, sizeof(var))) 928 return -EFAULT; 929 acquire_console_sem(); 930 info->flags |= FBINFO_MISC_USEREVENT; 931 i = fb_set_var(info, &var); 932 info->flags &= ~FBINFO_MISC_USEREVENT; 933 release_console_sem(); 934 if (i) return i; 935 if (copy_to_user(argp, &var, sizeof(var))) 936 return -EFAULT; 937 return 0; 938 case FBIOGET_FSCREENINFO: 939 return copy_to_user(argp, &info->fix, 940 sizeof(fix)) ? -EFAULT : 0; 941 case FBIOPUTCMAP: 942 if (copy_from_user(&cmap, argp, sizeof(cmap))) 943 return -EFAULT; 944 return (fb_set_user_cmap(&cmap, info)); 945 case FBIOGETCMAP: 946 if (copy_from_user(&cmap, argp, sizeof(cmap))) 947 return -EFAULT; 948 return fb_cmap_to_user(&info->cmap, &cmap); 949 case FBIOPAN_DISPLAY: 950 if (copy_from_user(&var, argp, sizeof(var))) 951 return -EFAULT; 952 acquire_console_sem(); 953 i = fb_pan_display(info, &var); 954 release_console_sem(); 955 if (i) 956 return i; 957 if (copy_to_user(argp, &var, sizeof(var))) 958 return -EFAULT; 959 return 0; 960 case FBIO_CURSOR: 961 return -EINVAL; 962 case FBIOGET_CON2FBMAP: 963 if (copy_from_user(&con2fb, argp, sizeof(con2fb))) 964 return -EFAULT; 965 if (con2fb.console < 1 || con2fb.console > MAX_NR_CONSOLES) 966 return -EINVAL; 967 con2fb.framebuffer = -1; 968 event.info = info; 969 event.data = &con2fb; 970 fb_notifier_call_chain(FB_EVENT_GET_CONSOLE_MAP, &event); 971 return copy_to_user(argp, &con2fb, 972 sizeof(con2fb)) ? -EFAULT : 0; 973 case FBIOPUT_CON2FBMAP: 974 if (copy_from_user(&con2fb, argp, sizeof(con2fb))) 975 return - EFAULT; 976 if (con2fb.console < 0 || con2fb.console > MAX_NR_CONSOLES) 977 return -EINVAL; 978 if (con2fb.framebuffer < 0 || con2fb.framebuffer >= FB_MAX) 979 return -EINVAL; 980#ifdef CONFIG_KMOD 981 if (!registered_fb[con2fb.framebuffer]) 982 try_to_load(con2fb.framebuffer); 983#endif /* CONFIG_KMOD */ 984 if (!registered_fb[con2fb.framebuffer]) 985 return -EINVAL; 986 event.info = info; 987 event.data = &con2fb; 988 return fb_notifier_call_chain(FB_EVENT_SET_CONSOLE_MAP, 989 &event); 990 case FBIOBLANK: 991 acquire_console_sem(); 992 info->flags |= FBINFO_MISC_USEREVENT; 993 i = fb_blank(info, arg); 994 info->flags &= ~FBINFO_MISC_USEREVENT; 995 release_console_sem(); 996 return i; 997 default: 998 if (fb->fb_ioctl == NULL) 999 return -EINVAL; 1000 return fb->fb_ioctl(info, cmd, arg); 1001 } 1002} 1003 1004#ifdef CONFIG_COMPAT 1005struct fb_fix_screeninfo32 { 1006 char id[16]; 1007 compat_caddr_t smem_start; 1008 u32 smem_len; 1009 u32 type; 1010 u32 type_aux; 1011 u32 visual; 1012 u16 xpanstep; 1013 u16 ypanstep; 1014 u16 ywrapstep; 1015 u32 line_length; 1016 compat_caddr_t mmio_start; 1017 u32 mmio_len; 1018 u32 accel; 1019 u16 reserved[3]; 1020}; 1021 1022struct fb_cmap32 { 1023 u32 start; 1024 u32 len; 1025 compat_caddr_t red; 1026 compat_caddr_t green; 1027 compat_caddr_t blue; 1028 compat_caddr_t transp; 1029}; 1030 1031static int fb_getput_cmap(struct inode *inode, struct file *file, 1032 unsigned int cmd, unsigned long arg) 1033{ 1034 struct fb_cmap_user __user *cmap; 1035 struct fb_cmap32 __user *cmap32; 1036 __u32 data; 1037 int err; 1038 1039 cmap = compat_alloc_user_space(sizeof(*cmap)); 1040 cmap32 = compat_ptr(arg); 1041 1042 if (copy_in_user(&cmap->start, &cmap32->start, 2 * sizeof(__u32))) 1043 return -EFAULT; 1044 1045 if (get_user(data, &cmap32->red) || 1046 put_user(compat_ptr(data), &cmap->red) || 1047 get_user(data, &cmap32->green) || 1048 put_user(compat_ptr(data), &cmap->green) || 1049 get_user(data, &cmap32->blue) || 1050 put_user(compat_ptr(data), &cmap->blue) || 1051 get_user(data, &cmap32->transp) || 1052 put_user(compat_ptr(data), &cmap->transp)) 1053 return -EFAULT; 1054 1055 err = fb_ioctl(inode, file, cmd, (unsigned long) cmap); 1056 1057 if (!err) { 1058 if (copy_in_user(&cmap32->start, 1059 &cmap->start, 1060 2 * sizeof(__u32))) 1061 err = -EFAULT; 1062 } 1063 return err; 1064} 1065 1066static int do_fscreeninfo_to_user(struct fb_fix_screeninfo *fix, 1067 struct fb_fix_screeninfo32 __user *fix32) 1068{ 1069 __u32 data; 1070 int err; 1071 1072 err = copy_to_user(&fix32->id, &fix->id, sizeof(fix32->id)); 1073 1074 data = (__u32) (unsigned long) fix->smem_start; 1075 err |= put_user(data, &fix32->smem_start); 1076 1077 err |= put_user(fix->smem_len, &fix32->smem_len); 1078 err |= put_user(fix->type, &fix32->type); 1079 err |= put_user(fix->type_aux, &fix32->type_aux); 1080 err |= put_user(fix->visual, &fix32->visual); 1081 err |= put_user(fix->xpanstep, &fix32->xpanstep); 1082 err |= put_user(fix->ypanstep, &fix32->ypanstep); 1083 err |= put_user(fix->ywrapstep, &fix32->ywrapstep); 1084 err |= put_user(fix->line_length, &fix32->line_length); 1085 1086 data = (__u32) (unsigned long) fix->mmio_start; 1087 err |= put_user(data, &fix32->mmio_start); 1088 1089 err |= put_user(fix->mmio_len, &fix32->mmio_len); 1090 err |= put_user(fix->accel, &fix32->accel); 1091 err |= copy_to_user(fix32->reserved, fix->reserved, 1092 sizeof(fix->reserved)); 1093 1094 return err; 1095} 1096 1097static int fb_get_fscreeninfo(struct inode *inode, struct file *file, 1098 unsigned int cmd, unsigned long arg) 1099{ 1100 mm_segment_t old_fs; 1101 struct fb_fix_screeninfo fix; 1102 struct fb_fix_screeninfo32 __user *fix32; 1103 int err; 1104 1105 fix32 = compat_ptr(arg); 1106 1107 old_fs = get_fs(); 1108 set_fs(KERNEL_DS); 1109 err = fb_ioctl(inode, file, cmd, (unsigned long) &fix); 1110 set_fs(old_fs); 1111 1112 if (!err) 1113 err = do_fscreeninfo_to_user(&fix, fix32); 1114 1115 return err; 1116} 1117 1118static long 1119fb_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) 1120{ 1121 struct inode *inode = file->f_path.dentry->d_inode; 1122 int fbidx = iminor(inode); 1123 struct fb_info *info = registered_fb[fbidx]; 1124 struct fb_ops *fb = info->fbops; 1125 long ret = -ENOIOCTLCMD; 1126 1127 lock_kernel(); 1128 switch(cmd) { 1129 case FBIOGET_VSCREENINFO: 1130 case FBIOPUT_VSCREENINFO: 1131 case FBIOPAN_DISPLAY: 1132 case FBIOGET_CON2FBMAP: 1133 case FBIOPUT_CON2FBMAP: 1134 arg = (unsigned long) compat_ptr(arg); 1135 case FBIOBLANK: 1136 ret = fb_ioctl(inode, file, cmd, arg); 1137 break; 1138 1139 case FBIOGET_FSCREENINFO: 1140 ret = fb_get_fscreeninfo(inode, file, cmd, arg); 1141 break; 1142 1143 case FBIOGETCMAP: 1144 case FBIOPUTCMAP: 1145 ret = fb_getput_cmap(inode, file, cmd, arg); 1146 break; 1147 1148 default: 1149 if (fb->fb_compat_ioctl) 1150 ret = fb->fb_compat_ioctl(info, cmd, arg); 1151 break; 1152 } 1153 unlock_kernel(); 1154 return ret; 1155} 1156#endif 1157 1158static int 1159fb_mmap(struct file *file, struct vm_area_struct * vma) 1160{ 1161 int fbidx = iminor(file->f_path.dentry->d_inode); 1162 struct fb_info *info = registered_fb[fbidx]; 1163 struct fb_ops *fb = info->fbops; 1164 unsigned long off; 1165#if !defined(__sparc__) || defined(__sparc_v9__) 1166 unsigned long start; 1167 u32 len; 1168#endif 1169 1170 if (vma->vm_pgoff > (~0UL >> PAGE_SHIFT)) 1171 return -EINVAL; 1172 off = vma->vm_pgoff << PAGE_SHIFT; 1173 if (!fb) 1174 return -ENODEV; 1175 if (fb->fb_mmap) { 1176 int res; 1177 lock_kernel(); 1178 res = fb->fb_mmap(info, vma); 1179 unlock_kernel(); 1180 return res; 1181 } 1182 1183#if defined(__sparc__) && !defined(__sparc_v9__) 1184 /* Should never get here, all fb drivers should have their own 1185 mmap routines */ 1186 return -EINVAL; 1187#else 1188 /* !sparc32... */ 1189 lock_kernel(); 1190 1191 /* frame buffer memory */ 1192 start = info->fix.smem_start; 1193 len = PAGE_ALIGN((start & ~PAGE_MASK) + info->fix.smem_len); 1194 if (off >= len) { 1195 /* memory mapped io */ 1196 off -= len; 1197 if (info->var.accel_flags) { 1198 unlock_kernel(); 1199 return -EINVAL; 1200 } 1201 start = info->fix.mmio_start; 1202 len = PAGE_ALIGN((start & ~PAGE_MASK) + info->fix.mmio_len); 1203 } 1204 unlock_kernel(); 1205 start &= PAGE_MASK; 1206 if ((vma->vm_end - vma->vm_start + off) > len) 1207 return -EINVAL; 1208 off += start; 1209 vma->vm_pgoff = off >> PAGE_SHIFT; 1210 /* This is an IO map - tell maydump to skip this VMA */ 1211 vma->vm_flags |= VM_IO | VM_RESERVED; 1212#if defined(__mc68000__) 1213#if defined(CONFIG_SUN3) 1214 pgprot_val(vma->vm_page_prot) |= SUN3_PAGE_NOCACHE; 1215#elif defined(CONFIG_MMU) 1216 if (CPU_IS_020_OR_030) 1217 pgprot_val(vma->vm_page_prot) |= _PAGE_NOCACHE030; 1218 if (CPU_IS_040_OR_060) { 1219 pgprot_val(vma->vm_page_prot) &= _CACHEMASK040; 1220 /* Use no-cache mode, serialized */ 1221 pgprot_val(vma->vm_page_prot) |= _PAGE_NOCACHE_S; 1222 } 1223#endif 1224#elif defined(__powerpc__) 1225 vma->vm_page_prot = phys_mem_access_prot(file, off >> PAGE_SHIFT, 1226 vma->vm_end - vma->vm_start, 1227 vma->vm_page_prot); 1228#elif defined(__alpha__) 1229 /* Caching is off in the I/O space quadrant by design. */ 1230#elif defined(__i386__) || defined(__x86_64__) 1231 if (boot_cpu_data.x86 > 3) 1232 pgprot_val(vma->vm_page_prot) |= _PAGE_PCD; 1233#elif defined(__mips__) || defined(__sparc_v9__) 1234 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); 1235#elif defined(__hppa__) 1236 pgprot_val(vma->vm_page_prot) |= _PAGE_NO_CACHE; 1237#elif defined(__arm__) || defined(__sh__) || defined(__m32r__) 1238 vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot); 1239#elif defined(__avr32__) 1240 vma->vm_page_prot = __pgprot((pgprot_val(vma->vm_page_prot) 1241 & ~_PAGE_CACHABLE) 1242 | (_PAGE_BUFFER | _PAGE_DIRTY)); 1243#elif defined(__ia64__) 1244 if (efi_range_is_wc(vma->vm_start, vma->vm_end - vma->vm_start)) 1245 vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot); 1246 else 1247 vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); 1248#else 1249#warning What do we have to do here?? 1250#endif 1251 if (io_remap_pfn_range(vma, vma->vm_start, off >> PAGE_SHIFT, 1252 vma->vm_end - vma->vm_start, vma->vm_page_prot)) 1253 return -EAGAIN; 1254 return 0; 1255#endif /* !sparc32 */ 1256} 1257 1258static int 1259fb_open(struct inode *inode, struct file *file) 1260{ 1261 int fbidx = iminor(inode); 1262 struct fb_info *info; 1263 int res = 0; 1264 1265 if (fbidx >= FB_MAX) 1266 return -ENODEV; 1267#ifdef CONFIG_KMOD 1268 if (!(info = registered_fb[fbidx])) 1269 try_to_load(fbidx); 1270#endif /* CONFIG_KMOD */ 1271 if (!(info = registered_fb[fbidx])) 1272 return -ENODEV; 1273 if (!try_module_get(info->fbops->owner)) 1274 return -ENODEV; 1275 file->private_data = info; 1276 if (info->fbops->fb_open) { 1277 res = info->fbops->fb_open(info,1); 1278 if (res) 1279 module_put(info->fbops->owner); 1280 } 1281 return res; 1282} 1283 1284static int 1285fb_release(struct inode *inode, struct file *file) 1286{ 1287 struct fb_info * const info = file->private_data; 1288 1289 lock_kernel(); 1290 if (info->fbops->fb_release) 1291 info->fbops->fb_release(info,1); 1292 module_put(info->fbops->owner); 1293 unlock_kernel(); 1294 return 0; 1295} 1296 1297static const struct file_operations fb_fops = { 1298 .owner = THIS_MODULE, 1299 .read = fb_read, 1300 .write = fb_write, 1301 .ioctl = fb_ioctl, 1302#ifdef CONFIG_COMPAT 1303 .compat_ioctl = fb_compat_ioctl, 1304#endif 1305 .mmap = fb_mmap, 1306 .open = fb_open, 1307 .release = fb_release, 1308#ifdef HAVE_ARCH_FB_UNMAPPED_AREA 1309 .get_unmapped_area = get_fb_unmapped_area, 1310#endif 1311#ifdef CONFIG_FB_DEFERRED_IO 1312 .fsync = fb_deferred_io_fsync, 1313#endif 1314}; 1315 1316struct class *fb_class; 1317EXPORT_SYMBOL(fb_class); 1318/** 1319 * register_framebuffer - registers a frame buffer device 1320 * @fb_info: frame buffer info structure 1321 * 1322 * Registers a frame buffer device @fb_info. 1323 * 1324 * Returns negative errno on error, or zero for success. 1325 * 1326 */ 1327 1328int 1329register_framebuffer(struct fb_info *fb_info) 1330{ 1331 int i; 1332 struct fb_event event; 1333 struct fb_videomode mode; 1334 1335 if (num_registered_fb == FB_MAX) 1336 return -ENXIO; 1337 num_registered_fb++; 1338 for (i = 0 ; i < FB_MAX; i++) 1339 if (!registered_fb[i]) 1340 break; 1341 fb_info->node = i; 1342 1343 fb_info->dev = device_create(fb_class, fb_info->device, 1344 MKDEV(FB_MAJOR, i), "fb%d", i); 1345 if (IS_ERR(fb_info->dev)) { 1346 /* Not fatal */ 1347 printk(KERN_WARNING "Unable to create device for framebuffer %d; errno = %ld\n", i, PTR_ERR(fb_info->dev)); 1348 fb_info->dev = NULL; 1349 } else 1350 fb_init_device(fb_info); 1351 1352 if (fb_info->pixmap.addr == NULL) { 1353 fb_info->pixmap.addr = kmalloc(FBPIXMAPSIZE, GFP_KERNEL); 1354 if (fb_info->pixmap.addr) { 1355 fb_info->pixmap.size = FBPIXMAPSIZE; 1356 fb_info->pixmap.buf_align = 1; 1357 fb_info->pixmap.scan_align = 1; 1358 fb_info->pixmap.access_align = 32; 1359 fb_info->pixmap.flags = FB_PIXMAP_DEFAULT; 1360 } 1361 } 1362 fb_info->pixmap.offset = 0; 1363 1364 if (!fb_info->pixmap.blit_x) 1365 fb_info->pixmap.blit_x = ~(u32)0; 1366 1367 if (!fb_info->pixmap.blit_y) 1368 fb_info->pixmap.blit_y = ~(u32)0; 1369 1370 if (!fb_info->modelist.prev || !fb_info->modelist.next) 1371 INIT_LIST_HEAD(&fb_info->modelist); 1372 1373 fb_var_to_videomode(&mode, &fb_info->var); 1374 fb_add_videomode(&mode, &fb_info->modelist); 1375 registered_fb[i] = fb_info; 1376 1377 event.info = fb_info; 1378 fb_notifier_call_chain(FB_EVENT_FB_REGISTERED, &event); 1379 return 0; 1380} 1381 1382 1383/** 1384 * unregister_framebuffer - releases a frame buffer device 1385 * @fb_info: frame buffer info structure 1386 * 1387 * Unregisters a frame buffer device @fb_info. 1388 * 1389 * Returns negative errno on error, or zero for success. 1390 * 1391 */ 1392 1393int 1394unregister_framebuffer(struct fb_info *fb_info) 1395{ 1396 struct fb_event event; 1397 int i; 1398 1399 i = fb_info->node; 1400 if (!registered_fb[i]) 1401 return -EINVAL; 1402 1403 if (fb_info->pixmap.addr && 1404 (fb_info->pixmap.flags & FB_PIXMAP_DEFAULT)) 1405 kfree(fb_info->pixmap.addr); 1406 fb_destroy_modelist(&fb_info->modelist); 1407 registered_fb[i]=NULL; 1408 num_registered_fb--; 1409 fb_cleanup_device(fb_info); 1410 device_destroy(fb_class, MKDEV(FB_MAJOR, i)); 1411 event.info = fb_info; 1412 fb_notifier_call_chain(FB_EVENT_FB_UNREGISTERED, &event); 1413 return 0; 1414} 1415 1416/** 1417 * fb_set_suspend - low level driver signals suspend 1418 * @info: framebuffer affected 1419 * @state: 0 = resuming, !=0 = suspending 1420 * 1421 * This is meant to be used by low level drivers to 1422 * signal suspend/resume to the core & clients. 1423 * It must be called with the console semaphore held 1424 */ 1425void fb_set_suspend(struct fb_info *info, int state) 1426{ 1427 struct fb_event event; 1428 1429 event.info = info; 1430 if (state) { 1431 fb_notifier_call_chain(FB_EVENT_SUSPEND, &event); 1432 info->state = FBINFO_STATE_SUSPENDED; 1433 } else { 1434 info->state = FBINFO_STATE_RUNNING; 1435 fb_notifier_call_chain(FB_EVENT_RESUME, &event); 1436 } 1437} 1438 1439/** 1440 * fbmem_init - init frame buffer subsystem 1441 * 1442 * Initialize the frame buffer subsystem. 1443 * 1444 * NOTE: This function is _only_ to be called by drivers/char/mem.c. 1445 * 1446 */ 1447 1448static int __init 1449fbmem_init(void) 1450{ 1451 create_proc_read_entry("fb", 0, NULL, fbmem_read_proc, NULL); 1452 1453 if (register_chrdev(FB_MAJOR,"fb",&fb_fops)) 1454 printk("unable to get major %d for fb devs\n", FB_MAJOR); 1455 1456 fb_class = class_create(THIS_MODULE, "graphics"); 1457 if (IS_ERR(fb_class)) { 1458 printk(KERN_WARNING "Unable to create fb class; errno = %ld\n", PTR_ERR(fb_class)); 1459 fb_class = NULL; 1460 } 1461 return 0; 1462} 1463 1464#ifdef MODULE 1465module_init(fbmem_init); 1466static void __exit 1467fbmem_exit(void) 1468{ 1469 class_destroy(fb_class); 1470 unregister_chrdev(FB_MAJOR, "fb"); 1471} 1472 1473module_exit(fbmem_exit); 1474MODULE_LICENSE("GPL"); 1475MODULE_DESCRIPTION("Framebuffer base"); 1476#else 1477subsys_initcall(fbmem_init); 1478#endif 1479 1480int fb_new_modelist(struct fb_info *info) 1481{ 1482 struct fb_event event; 1483 struct fb_var_screeninfo var = info->var; 1484 struct list_head *pos, *n; 1485 struct fb_modelist *modelist; 1486 struct fb_videomode *m, mode; 1487 int err = 1; 1488 1489 list_for_each_safe(pos, n, &info->modelist) { 1490 modelist = list_entry(pos, struct fb_modelist, list); 1491 m = &modelist->mode; 1492 fb_videomode_to_var(&var, m); 1493 var.activate = FB_ACTIVATE_TEST; 1494 err = fb_set_var(info, &var); 1495 fb_var_to_videomode(&mode, &var); 1496 if (err || !fb_mode_is_equal(m, &mode)) { 1497 list_del(pos); 1498 kfree(pos); 1499 } 1500 } 1501 1502 err = 1; 1503 1504 if (!list_empty(&info->modelist)) { 1505 event.info = info; 1506 err = fb_notifier_call_chain(FB_EVENT_NEW_MODELIST, &event); 1507 } 1508 1509 return err; 1510} 1511 1512static char *video_options[FB_MAX] __read_mostly; 1513static int ofonly __read_mostly; 1514 1515extern const char *global_mode_option; 1516 1517/** 1518 * fb_get_options - get kernel boot parameters 1519 * @name: framebuffer name as it would appear in 1520 * the boot parameter line 1521 * (video=<name>:<options>) 1522 * @option: the option will be stored here 1523 * 1524 * NOTE: Needed to maintain backwards compatibility 1525 */ 1526int fb_get_options(char *name, char **option) 1527{ 1528 char *opt, *options = NULL; 1529 int opt_len, retval = 0; 1530 int name_len = strlen(name), i; 1531 1532 if (name_len && ofonly && strncmp(name, "offb", 4)) 1533 retval = 1; 1534 1535 if (name_len && !retval) { 1536 for (i = 0; i < FB_MAX; i++) { 1537 if (video_options[i] == NULL) 1538 continue; 1539 opt_len = strlen(video_options[i]); 1540 if (!opt_len) 1541 continue; 1542 opt = video_options[i]; 1543 if (!strncmp(name, opt, name_len) && 1544 opt[name_len] == ':') 1545 options = opt + name_len + 1; 1546 } 1547 } 1548 if (options && !strncmp(options, "off", 3)) 1549 retval = 1; 1550 1551 if (option) 1552 *option = options; 1553 1554 return retval; 1555} 1556 1557#ifndef MODULE 1558/** 1559 * video_setup - process command line options 1560 * @options: string of options 1561 * 1562 * Process command line options for frame buffer subsystem. 1563 * 1564 * NOTE: This function is a __setup and __init function. 1565 * It only stores the options. Drivers have to call 1566 * fb_get_options() as necessary. 1567 * 1568 * Returns zero. 1569 * 1570 */ 1571static int __init video_setup(char *options) 1572{ 1573 int i, global = 0; 1574 1575 if (!options || !*options) 1576 global = 1; 1577 1578 if (!global && !strncmp(options, "ofonly", 6)) { 1579 ofonly = 1; 1580 global = 1; 1581 } 1582 1583 if (!global && !strstr(options, "fb:")) { 1584 global_mode_option = options; 1585 global = 1; 1586 } 1587 1588 if (!global) { 1589 for (i = 0; i < FB_MAX; i++) { 1590 if (video_options[i] == NULL) { 1591 video_options[i] = options; 1592 break; 1593 } 1594 1595 } 1596 } 1597 1598 return 1; 1599} 1600__setup("video=", video_setup); 1601#endif 1602 1603 /* 1604 * Visible symbols for modules 1605 */ 1606 1607EXPORT_SYMBOL(register_framebuffer); 1608EXPORT_SYMBOL(unregister_framebuffer); 1609EXPORT_SYMBOL(num_registered_fb); 1610EXPORT_SYMBOL(registered_fb); 1611EXPORT_SYMBOL(fb_prepare_logo); 1612EXPORT_SYMBOL(fb_show_logo); 1613EXPORT_SYMBOL(fb_set_var); 1614EXPORT_SYMBOL(fb_blank); 1615EXPORT_SYMBOL(fb_pan_display); 1616EXPORT_SYMBOL(fb_get_buffer_offset); 1617EXPORT_SYMBOL(fb_set_suspend); 1618EXPORT_SYMBOL(fb_get_options); 1619 1620MODULE_LICENSE("GPL"); 1621