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