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