linux/drivers/video/fbmem.c
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   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(&registration_lock);
  57        fb_info = registered_fb[idx];
  58        if (fb_info)
  59                atomic_inc(&fb_info->count);
  60        mutex_unlock(&registration_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(&registration_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(&registration_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 = &caps;
 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        struct fb_event event;
1050        int ret = -EINVAL, early_ret;
1051
1052        if (blank > FB_BLANK_POWERDOWN)
1053                blank = FB_BLANK_POWERDOWN;
1054
1055        event.info = info;
1056        event.data = &blank;
1057
1058        early_ret = fb_notifier_call_chain(FB_EARLY_EVENT_BLANK, &event);
1059
1060        if (info->fbops->fb_blank)
1061                ret = info->fbops->fb_blank(blank, info);
1062
1063        if (!ret)
1064                fb_notifier_call_chain(FB_EVENT_BLANK, &event);
1065        else {
1066                /*
1067                 * if fb_blank is failed then revert effects of
1068                 * the early blank event.
1069                 */
1070                if (!early_ret)
1071                        fb_notifier_call_chain(FB_R_EARLY_EVENT_BLANK, &event);
1072        }
1073
1074        return ret;
1075}
1076
1077static long do_fb_ioctl(struct fb_info *info, unsigned int cmd,
1078                        unsigned long arg)
1079{
1080        struct fb_ops *fb;
1081        struct fb_var_screeninfo var;
1082        struct fb_fix_screeninfo fix;
1083        struct fb_con2fbmap con2fb;
1084        struct fb_cmap cmap_from;
1085        struct fb_cmap_user cmap;
1086        struct fb_event event;
1087        void __user *argp = (void __user *)arg;
1088        long ret = 0;
1089
1090        switch (cmd) {
1091        case FBIOGET_VSCREENINFO:
1092                if (!lock_fb_info(info))
1093                        return -ENODEV;
1094                var = info->var;
1095                unlock_fb_info(info);
1096
1097                ret = copy_to_user(argp, &var, sizeof(var)) ? -EFAULT : 0;
1098                break;
1099        case FBIOPUT_VSCREENINFO:
1100                if (copy_from_user(&var, argp, sizeof(var)))
1101                        return -EFAULT;
1102                if (!lock_fb_info(info))
1103                        return -ENODEV;
1104                console_lock();
1105                info->flags |= FBINFO_MISC_USEREVENT;
1106                ret = fb_set_var(info, &var);
1107                info->flags &= ~FBINFO_MISC_USEREVENT;
1108                console_unlock();
1109                unlock_fb_info(info);
1110                if (!ret && copy_to_user(argp, &var, sizeof(var)))
1111                        ret = -EFAULT;
1112                break;
1113        case FBIOGET_FSCREENINFO:
1114                if (!lock_fb_info(info))
1115                        return -ENODEV;
1116                fix = info->fix;
1117                unlock_fb_info(info);
1118
1119                ret = copy_to_user(argp, &fix, sizeof(fix)) ? -EFAULT : 0;
1120                break;
1121        case FBIOPUTCMAP:
1122                if (copy_from_user(&cmap, argp, sizeof(cmap)))
1123                        return -EFAULT;
1124                ret = fb_set_user_cmap(&cmap, info);
1125                break;
1126        case FBIOGETCMAP:
1127                if (copy_from_user(&cmap, argp, sizeof(cmap)))
1128                        return -EFAULT;
1129                if (!lock_fb_info(info))
1130                        return -ENODEV;
1131                cmap_from = info->cmap;
1132                unlock_fb_info(info);
1133                ret = fb_cmap_to_user(&cmap_from, &cmap);
1134                break;
1135        case FBIOPAN_DISPLAY:
1136                if (copy_from_user(&var, argp, sizeof(var)))
1137                        return -EFAULT;
1138                if (!lock_fb_info(info))
1139                        return -ENODEV;
1140                console_lock();
1141                ret = fb_pan_display(info, &var);
1142                console_unlock();
1143                unlock_fb_info(info);
1144                if (ret == 0 && copy_to_user(argp, &var, sizeof(var)))
1145                        return -EFAULT;
1146                break;
1147        case FBIO_CURSOR:
1148                ret = -EINVAL;
1149                break;
1150        case FBIOGET_CON2FBMAP:
1151                if (copy_from_user(&con2fb, argp, sizeof(con2fb)))
1152                        return -EFAULT;
1153                if (con2fb.console < 1 || con2fb.console > MAX_NR_CONSOLES)
1154                        return -EINVAL;
1155                con2fb.framebuffer = -1;
1156                event.data = &con2fb;
1157                if (!lock_fb_info(info))
1158                        return -ENODEV;
1159                event.info = info;
1160                fb_notifier_call_chain(FB_EVENT_GET_CONSOLE_MAP, &event);
1161                unlock_fb_info(info);
1162                ret = copy_to_user(argp, &con2fb, sizeof(con2fb)) ? -EFAULT : 0;
1163                break;
1164        case FBIOPUT_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                if (con2fb.framebuffer < 0 || con2fb.framebuffer >= FB_MAX)
1170                        return -EINVAL;
1171                if (!registered_fb[con2fb.framebuffer])
1172                        request_module("fb%d", con2fb.framebuffer);
1173                if (!registered_fb[con2fb.framebuffer]) {
1174                        ret = -EINVAL;
1175                        break;
1176                }
1177                event.data = &con2fb;
1178                if (!lock_fb_info(info))
1179                        return -ENODEV;
1180                event.info = info;
1181                ret = fb_notifier_call_chain(FB_EVENT_SET_CONSOLE_MAP, &event);
1182                unlock_fb_info(info);
1183                break;
1184        case FBIOBLANK:
1185                if (!lock_fb_info(info))
1186                        return -ENODEV;
1187                console_lock();
1188                info->flags |= FBINFO_MISC_USEREVENT;
1189                ret = fb_blank(info, arg);
1190                info->flags &= ~FBINFO_MISC_USEREVENT;
1191                console_unlock();
1192                unlock_fb_info(info);
1193                break;
1194        default:
1195                if (!lock_fb_info(info))
1196                        return -ENODEV;
1197                fb = info->fbops;
1198                if (fb->fb_ioctl)
1199                        ret = fb->fb_ioctl(info, cmd, arg);
1200                else
1201                        ret = -ENOTTY;
1202                unlock_fb_info(info);
1203        }
1204        return ret;
1205}
1206
1207static long fb_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
1208{
1209        struct fb_info *info = file_fb_info(file);
1210
1211        if (!info)
1212                return -ENODEV;
1213        return do_fb_ioctl(info, cmd, arg);
1214}
1215
1216#ifdef CONFIG_COMPAT
1217struct fb_fix_screeninfo32 {
1218        char                    id[16];
1219        compat_caddr_t          smem_start;
1220        u32                     smem_len;
1221        u32                     type;
1222        u32                     type_aux;
1223        u32                     visual;
1224        u16                     xpanstep;
1225        u16                     ypanstep;
1226        u16                     ywrapstep;
1227        u32                     line_length;
1228        compat_caddr_t          mmio_start;
1229        u32                     mmio_len;
1230        u32                     accel;
1231        u16                     reserved[3];
1232};
1233
1234struct fb_cmap32 {
1235        u32                     start;
1236        u32                     len;
1237        compat_caddr_t  red;
1238        compat_caddr_t  green;
1239        compat_caddr_t  blue;
1240        compat_caddr_t  transp;
1241};
1242
1243static int fb_getput_cmap(struct fb_info *info, unsigned int cmd,
1244                          unsigned long arg)
1245{
1246        struct fb_cmap_user __user *cmap;
1247        struct fb_cmap32 __user *cmap32;
1248        __u32 data;
1249        int err;
1250
1251        cmap = compat_alloc_user_space(sizeof(*cmap));
1252        cmap32 = compat_ptr(arg);
1253
1254        if (copy_in_user(&cmap->start, &cmap32->start, 2 * sizeof(__u32)))
1255                return -EFAULT;
1256
1257        if (get_user(data, &cmap32->red) ||
1258            put_user(compat_ptr(data), &cmap->red) ||
1259            get_user(data, &cmap32->green) ||
1260            put_user(compat_ptr(data), &cmap->green) ||
1261            get_user(data, &cmap32->blue) ||
1262            put_user(compat_ptr(data), &cmap->blue) ||
1263            get_user(data, &cmap32->transp) ||
1264            put_user(compat_ptr(data), &cmap->transp))
1265                return -EFAULT;
1266
1267        err = do_fb_ioctl(info, cmd, (unsigned long) cmap);
1268
1269        if (!err) {
1270                if (copy_in_user(&cmap32->start,
1271                                 &cmap->start,
1272                                 2 * sizeof(__u32)))
1273                        err = -EFAULT;
1274        }
1275        return err;
1276}
1277
1278static int do_fscreeninfo_to_user(struct fb_fix_screeninfo *fix,
1279                                  struct fb_fix_screeninfo32 __user *fix32)
1280{
1281        __u32 data;
1282        int err;
1283
1284        err = copy_to_user(&fix32->id, &fix->id, sizeof(fix32->id));
1285
1286        data = (__u32) (unsigned long) fix->smem_start;
1287        err |= put_user(data, &fix32->smem_start);
1288
1289        err |= put_user(fix->smem_len, &fix32->smem_len);
1290        err |= put_user(fix->type, &fix32->type);
1291        err |= put_user(fix->type_aux, &fix32->type_aux);
1292        err |= put_user(fix->visual, &fix32->visual);
1293        err |= put_user(fix->xpanstep, &fix32->xpanstep);
1294        err |= put_user(fix->ypanstep, &fix32->ypanstep);
1295        err |= put_user(fix->ywrapstep, &fix32->ywrapstep);
1296        err |= put_user(fix->line_length, &fix32->line_length);
1297
1298        data = (__u32) (unsigned long) fix->mmio_start;
1299        err |= put_user(data, &fix32->mmio_start);
1300
1301        err |= put_user(fix->mmio_len, &fix32->mmio_len);
1302        err |= put_user(fix->accel, &fix32->accel);
1303        err |= copy_to_user(fix32->reserved, fix->reserved,
1304                            sizeof(fix->reserved));
1305
1306        return err;
1307}
1308
1309static int fb_get_fscreeninfo(struct fb_info *info, unsigned int cmd,
1310                              unsigned long arg)
1311{
1312        mm_segment_t old_fs;
1313        struct fb_fix_screeninfo fix;
1314        struct fb_fix_screeninfo32 __user *fix32;
1315        int err;
1316
1317        fix32 = compat_ptr(arg);
1318
1319        old_fs = get_fs();
1320        set_fs(KERNEL_DS);
1321        err = do_fb_ioctl(info, cmd, (unsigned long) &fix);
1322        set_fs(old_fs);
1323
1324        if (!err)
1325                err = do_fscreeninfo_to_user(&fix, fix32);
1326
1327        return err;
1328}
1329
1330static long fb_compat_ioctl(struct file *file, unsigned int cmd,
1331                            unsigned long arg)
1332{
1333        struct fb_info *info = file_fb_info(file);
1334        struct fb_ops *fb;
1335        long ret = -ENOIOCTLCMD;
1336
1337        if (!info)
1338                return -ENODEV;
1339        fb = info->fbops;
1340        switch(cmd) {
1341        case FBIOGET_VSCREENINFO:
1342        case FBIOPUT_VSCREENINFO:
1343        case FBIOPAN_DISPLAY:
1344        case FBIOGET_CON2FBMAP:
1345        case FBIOPUT_CON2FBMAP:
1346                arg = (unsigned long) compat_ptr(arg);
1347        case FBIOBLANK:
1348                ret = do_fb_ioctl(info, cmd, arg);
1349                break;
1350
1351        case FBIOGET_FSCREENINFO:
1352                ret = fb_get_fscreeninfo(info, cmd, arg);
1353                break;
1354
1355        case FBIOGETCMAP:
1356        case FBIOPUTCMAP:
1357                ret = fb_getput_cmap(info, cmd, arg);
1358                break;
1359
1360        default:
1361                if (fb->fb_compat_ioctl)
1362                        ret = fb->fb_compat_ioctl(info, cmd, arg);
1363                break;
1364        }
1365        return ret;
1366}
1367#endif
1368
1369static int
1370fb_mmap(struct file *file, struct vm_area_struct * vma)
1371{
1372        struct fb_info *info = file_fb_info(file);
1373        struct fb_ops *fb;
1374        unsigned long off;
1375        unsigned long start;
1376        u32 len;
1377
1378        if (!info)
1379                return -ENODEV;
1380        if (vma->vm_pgoff > (~0UL >> PAGE_SHIFT))
1381                return -EINVAL;
1382        off = vma->vm_pgoff << PAGE_SHIFT;
1383        fb = info->fbops;
1384        if (!fb)
1385                return -ENODEV;
1386        mutex_lock(&info->mm_lock);
1387        if (fb->fb_mmap) {
1388                int res;
1389                res = fb->fb_mmap(info, vma);
1390                mutex_unlock(&info->mm_lock);
1391                return res;
1392        }
1393
1394        /* frame buffer memory */
1395        start = info->fix.smem_start;
1396        len = PAGE_ALIGN((start & ~PAGE_MASK) + info->fix.smem_len);
1397        if (off >= len) {
1398                /* memory mapped io */
1399                off -= len;
1400                if (info->var.accel_flags) {
1401                        mutex_unlock(&info->mm_lock);
1402                        return -EINVAL;
1403                }
1404                start = info->fix.mmio_start;
1405                len = PAGE_ALIGN((start & ~PAGE_MASK) + info->fix.mmio_len);
1406        }
1407        mutex_unlock(&info->mm_lock);
1408        start &= PAGE_MASK;
1409        if ((vma->vm_end - vma->vm_start + off) > len)
1410                return -EINVAL;
1411        off += start;
1412        vma->vm_pgoff = off >> PAGE_SHIFT;
1413        /* This is an IO map - tell maydump to skip this VMA */
1414        vma->vm_flags |= VM_IO | VM_RESERVED;
1415        vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
1416        fb_pgprotect(file, vma, off);
1417        if (io_remap_pfn_range(vma, vma->vm_start, off >> PAGE_SHIFT,
1418                             vma->vm_end - vma->vm_start, vma->vm_page_prot))
1419                return -EAGAIN;
1420        return 0;
1421}
1422
1423static int
1424fb_open(struct inode *inode, struct file *file)
1425__acquires(&info->lock)
1426__releases(&info->lock)
1427{
1428        int fbidx = iminor(inode);
1429        struct fb_info *info;
1430        int res = 0;
1431
1432        info = get_fb_info(fbidx);
1433        if (!info) {
1434                request_module("fb%d", fbidx);
1435                info = get_fb_info(fbidx);
1436                if (!info)
1437                        return -ENODEV;
1438        }
1439        if (IS_ERR(info))
1440                return PTR_ERR(info);
1441
1442        mutex_lock(&info->lock);
1443        if (!try_module_get(info->fbops->owner)) {
1444                res = -ENODEV;
1445                goto out;
1446        }
1447        file->private_data = info;
1448        if (info->fbops->fb_open) {
1449                res = info->fbops->fb_open(info,1);
1450                if (res)
1451                        module_put(info->fbops->owner);
1452        }
1453#ifdef CONFIG_FB_DEFERRED_IO
1454        if (info->fbdefio)
1455                fb_deferred_io_open(info, inode, file);
1456#endif
1457out:
1458        mutex_unlock(&info->lock);
1459        if (res)
1460                put_fb_info(info);
1461        return res;
1462}
1463
1464static int 
1465fb_release(struct inode *inode, struct file *file)
1466__acquires(&info->lock)
1467__releases(&info->lock)
1468{
1469        struct fb_info * const info = file->private_data;
1470
1471        mutex_lock(&info->lock);
1472        if (info->fbops->fb_release)
1473                info->fbops->fb_release(info,1);
1474        module_put(info->fbops->owner);
1475        mutex_unlock(&info->lock);
1476        put_fb_info(info);
1477        return 0;
1478}
1479
1480static const struct file_operations fb_fops = {
1481        .owner =        THIS_MODULE,
1482        .read =         fb_read,
1483        .write =        fb_write,
1484        .unlocked_ioctl = fb_ioctl,
1485#ifdef CONFIG_COMPAT
1486        .compat_ioctl = fb_compat_ioctl,
1487#endif
1488        .mmap =         fb_mmap,
1489        .open =         fb_open,
1490        .release =      fb_release,
1491#ifdef HAVE_ARCH_FB_UNMAPPED_AREA
1492        .get_unmapped_area = get_fb_unmapped_area,
1493#endif
1494#ifdef CONFIG_FB_DEFERRED_IO
1495        .fsync =        fb_deferred_io_fsync,
1496#endif
1497        .llseek =       default_llseek,
1498};
1499
1500struct class *fb_class;
1501EXPORT_SYMBOL(fb_class);
1502
1503static int fb_check_foreignness(struct fb_info *fi)
1504{
1505        const bool foreign_endian = fi->flags & FBINFO_FOREIGN_ENDIAN;
1506
1507        fi->flags &= ~FBINFO_FOREIGN_ENDIAN;
1508
1509#ifdef __BIG_ENDIAN
1510        fi->flags |= foreign_endian ? 0 : FBINFO_BE_MATH;
1511#else
1512        fi->flags |= foreign_endian ? FBINFO_BE_MATH : 0;
1513#endif /* __BIG_ENDIAN */
1514
1515        if (fi->flags & FBINFO_BE_MATH && !fb_be_math(fi)) {
1516                pr_err("%s: enable CONFIG_FB_BIG_ENDIAN to "
1517                       "support this framebuffer\n", fi->fix.id);
1518                return -ENOSYS;
1519        } else if (!(fi->flags & FBINFO_BE_MATH) && fb_be_math(fi)) {
1520                pr_err("%s: enable CONFIG_FB_LITTLE_ENDIAN to "
1521                       "support this framebuffer\n", fi->fix.id);
1522                return -ENOSYS;
1523        }
1524
1525        return 0;
1526}
1527
1528static bool apertures_overlap(struct aperture *gen, struct aperture *hw)
1529{
1530        /* is the generic aperture base the same as the HW one */
1531        if (gen->base == hw->base)
1532                return true;
1533        /* is the generic aperture base inside the hw base->hw base+size */
1534        if (gen->base > hw->base && gen->base < hw->base + hw->size)
1535                return true;
1536        return false;
1537}
1538
1539static bool fb_do_apertures_overlap(struct apertures_struct *gena,
1540                                    struct apertures_struct *hwa)
1541{
1542        int i, j;
1543        if (!hwa || !gena)
1544                return false;
1545
1546        for (i = 0; i < hwa->count; ++i) {
1547                struct aperture *h = &hwa->ranges[i];
1548                for (j = 0; j < gena->count; ++j) {
1549                        struct aperture *g = &gena->ranges[j];
1550                        printk(KERN_DEBUG "checking generic (%llx %llx) vs hw (%llx %llx)\n",
1551                                (unsigned long long)g->base,
1552                                (unsigned long long)g->size,
1553                                (unsigned long long)h->base,
1554                                (unsigned long long)h->size);
1555                        if (apertures_overlap(g, h))
1556                                return true;
1557                }
1558        }
1559
1560        return false;
1561}
1562
1563static int do_unregister_framebuffer(struct fb_info *fb_info);
1564
1565#define VGA_FB_PHYS 0xA0000
1566static void do_remove_conflicting_framebuffers(struct apertures_struct *a,
1567                                     const char *name, bool primary)
1568{
1569        int i;
1570
1571        /* check all firmware fbs and kick off if the base addr overlaps */
1572        for (i = 0 ; i < FB_MAX; i++) {
1573                struct apertures_struct *gen_aper;
1574                if (!registered_fb[i])
1575                        continue;
1576
1577                if (!(registered_fb[i]->flags & FBINFO_MISC_FIRMWARE))
1578                        continue;
1579
1580                gen_aper = registered_fb[i]->apertures;
1581                if (fb_do_apertures_overlap(gen_aper, a) ||
1582                        (primary && gen_aper && gen_aper->count &&
1583                         gen_aper->ranges[0].base == VGA_FB_PHYS)) {
1584
1585                        printk(KERN_INFO "fb: conflicting fb hw usage "
1586                               "%s vs %s - removing generic driver\n",
1587                               name, registered_fb[i]->fix.id);
1588                        do_unregister_framebuffer(registered_fb[i]);
1589                }
1590        }
1591}
1592
1593static int do_register_framebuffer(struct fb_info *fb_info)
1594{
1595        int i;
1596        struct fb_event event;
1597        struct fb_videomode mode;
1598
1599        if (fb_check_foreignness(fb_info))
1600                return -ENOSYS;
1601
1602        do_remove_conflicting_framebuffers(fb_info->apertures, fb_info->fix.id,
1603                                         fb_is_primary_device(fb_info));
1604
1605        if (num_registered_fb == FB_MAX)
1606                return -ENXIO;
1607
1608        num_registered_fb++;
1609        for (i = 0 ; i < FB_MAX; i++)
1610                if (!registered_fb[i])
1611                        break;
1612        fb_info->node = i;
1613        atomic_set(&fb_info->count, 1);
1614        mutex_init(&fb_info->lock);
1615        mutex_init(&fb_info->mm_lock);
1616
1617        fb_info->dev = device_create(fb_class, fb_info->device,
1618                                     MKDEV(FB_MAJOR, i), NULL, "fb%d", i);
1619        if (IS_ERR(fb_info->dev)) {
1620                /* Not fatal */
1621                printk(KERN_WARNING "Unable to create device for framebuffer %d; errno = %ld\n", i, PTR_ERR(fb_info->dev));
1622                fb_info->dev = NULL;
1623        } else
1624                fb_init_device(fb_info);
1625
1626        if (fb_info->pixmap.addr == NULL) {
1627                fb_info->pixmap.addr = kmalloc(FBPIXMAPSIZE, GFP_KERNEL);
1628                if (fb_info->pixmap.addr) {
1629                        fb_info->pixmap.size = FBPIXMAPSIZE;
1630                        fb_info->pixmap.buf_align = 1;
1631                        fb_info->pixmap.scan_align = 1;
1632                        fb_info->pixmap.access_align = 32;
1633                        fb_info->pixmap.flags = FB_PIXMAP_DEFAULT;
1634                }
1635        }       
1636        fb_info->pixmap.offset = 0;
1637
1638        if (!fb_info->pixmap.blit_x)
1639                fb_info->pixmap.blit_x = ~(u32)0;
1640
1641        if (!fb_info->pixmap.blit_y)
1642                fb_info->pixmap.blit_y = ~(u32)0;
1643
1644        if (!fb_info->modelist.prev || !fb_info->modelist.next)
1645                INIT_LIST_HEAD(&fb_info->modelist);
1646
1647        fb_var_to_videomode(&mode, &fb_info->var);
1648        fb_add_videomode(&mode, &fb_info->modelist);
1649        registered_fb[i] = fb_info;
1650
1651        event.info = fb_info;
1652        if (!lock_fb_info(fb_info))
1653                return -ENODEV;
1654        fb_notifier_call_chain(FB_EVENT_FB_REGISTERED, &event);
1655        unlock_fb_info(fb_info);
1656        return 0;
1657}
1658
1659static int do_unregister_framebuffer(struct fb_info *fb_info)
1660{
1661        struct fb_event event;
1662        int i, ret = 0;
1663
1664        i = fb_info->node;
1665        if (i < 0 || i >= FB_MAX || registered_fb[i] != fb_info)
1666                return -EINVAL;
1667
1668        if (!lock_fb_info(fb_info))
1669                return -ENODEV;
1670        event.info = fb_info;
1671        ret = fb_notifier_call_chain(FB_EVENT_FB_UNBIND, &event);
1672        unlock_fb_info(fb_info);
1673
1674        if (ret)
1675                return -EINVAL;
1676
1677        unlink_framebuffer(fb_info);
1678        if (fb_info->pixmap.addr &&
1679            (fb_info->pixmap.flags & FB_PIXMAP_DEFAULT))
1680                kfree(fb_info->pixmap.addr);
1681        fb_destroy_modelist(&fb_info->modelist);
1682        registered_fb[i] = NULL;
1683        num_registered_fb--;
1684        fb_cleanup_device(fb_info);
1685        event.info = fb_info;
1686        fb_notifier_call_chain(FB_EVENT_FB_UNREGISTERED, &event);
1687
1688        /* this may free fb info */
1689        put_fb_info(fb_info);
1690        return 0;
1691}
1692
1693int unlink_framebuffer(struct fb_info *fb_info)
1694{
1695        int i;
1696
1697        i = fb_info->node;
1698        if (i < 0 || i >= FB_MAX || registered_fb[i] != fb_info)
1699                return -EINVAL;
1700
1701        if (fb_info->dev) {
1702                device_destroy(fb_class, MKDEV(FB_MAJOR, i));
1703                fb_info->dev = NULL;
1704        }
1705        return 0;
1706}
1707EXPORT_SYMBOL(unlink_framebuffer);
1708
1709void remove_conflicting_framebuffers(struct apertures_struct *a,
1710                                     const char *name, bool primary)
1711{
1712        mutex_lock(&registration_lock);
1713        do_remove_conflicting_framebuffers(a, name, primary);
1714        mutex_unlock(&registration_lock);
1715}
1716EXPORT_SYMBOL(remove_conflicting_framebuffers);
1717
1718/**
1719 *      register_framebuffer - registers a frame buffer device
1720 *      @fb_info: frame buffer info structure
1721 *
1722 *      Registers a frame buffer device @fb_info.
1723 *
1724 *      Returns negative errno on error, or zero for success.
1725 *
1726 */
1727int
1728register_framebuffer(struct fb_info *fb_info)
1729{
1730        int ret;
1731
1732        mutex_lock(&registration_lock);
1733        ret = do_register_framebuffer(fb_info);
1734        mutex_unlock(&registration_lock);
1735
1736        return ret;
1737}
1738
1739/**
1740 *      unregister_framebuffer - releases a frame buffer device
1741 *      @fb_info: frame buffer info structure
1742 *
1743 *      Unregisters a frame buffer device @fb_info.
1744 *
1745 *      Returns negative errno on error, or zero for success.
1746 *
1747 *      This function will also notify the framebuffer console
1748 *      to release the driver.
1749 *
1750 *      This is meant to be called within a driver's module_exit()
1751 *      function. If this is called outside module_exit(), ensure
1752 *      that the driver implements fb_open() and fb_release() to
1753 *      check that no processes are using the device.
1754 */
1755int
1756unregister_framebuffer(struct fb_info *fb_info)
1757{
1758        int ret;
1759
1760        mutex_lock(&registration_lock);
1761        ret = do_unregister_framebuffer(fb_info);
1762        mutex_unlock(&registration_lock);
1763
1764        return ret;
1765}
1766
1767/**
1768 *      fb_set_suspend - low level driver signals suspend
1769 *      @info: framebuffer affected
1770 *      @state: 0 = resuming, !=0 = suspending
1771 *
1772 *      This is meant to be used by low level drivers to
1773 *      signal suspend/resume to the core & clients.
1774 *      It must be called with the console semaphore held
1775 */
1776void fb_set_suspend(struct fb_info *info, int state)
1777{
1778        struct fb_event event;
1779
1780        event.info = info;
1781        if (state) {
1782                fb_notifier_call_chain(FB_EVENT_SUSPEND, &event);
1783                info->state = FBINFO_STATE_SUSPENDED;
1784        } else {
1785                info->state = FBINFO_STATE_RUNNING;
1786                fb_notifier_call_chain(FB_EVENT_RESUME, &event);
1787        }
1788}
1789
1790/**
1791 *      fbmem_init - init frame buffer subsystem
1792 *
1793 *      Initialize the frame buffer subsystem.
1794 *
1795 *      NOTE: This function is _only_ to be called by drivers/char/mem.c.
1796 *
1797 */
1798
1799static int __init
1800fbmem_init(void)
1801{
1802        proc_create("fb", 0, NULL, &fb_proc_fops);
1803
1804        if (register_chrdev(FB_MAJOR,"fb",&fb_fops))
1805                printk("unable to get major %d for fb devs\n", FB_MAJOR);
1806
1807        fb_class = class_create(THIS_MODULE, "graphics");
1808        if (IS_ERR(fb_class)) {
1809                printk(KERN_WARNING "Unable to create fb class; errno = %ld\n", PTR_ERR(fb_class));
1810                fb_class = NULL;
1811        }
1812        return 0;
1813}
1814
1815#ifdef MODULE
1816module_init(fbmem_init);
1817static void __exit
1818fbmem_exit(void)
1819{
1820        remove_proc_entry("fb", NULL);
1821        class_destroy(fb_class);
1822        unregister_chrdev(FB_MAJOR, "fb");
1823}
1824
1825module_exit(fbmem_exit);
1826MODULE_LICENSE("GPL");
1827MODULE_DESCRIPTION("Framebuffer base");
1828#else
1829subsys_initcall(fbmem_init);
1830#endif
1831
1832int fb_new_modelist(struct fb_info *info)
1833{
1834        struct fb_event event;
1835        struct fb_var_screeninfo var = info->var;
1836        struct list_head *pos, *n;
1837        struct fb_modelist *modelist;
1838        struct fb_videomode *m, mode;
1839        int err = 1;
1840
1841        list_for_each_safe(pos, n, &info->modelist) {
1842                modelist = list_entry(pos, struct fb_modelist, list);
1843                m = &modelist->mode;
1844                fb_videomode_to_var(&var, m);
1845                var.activate = FB_ACTIVATE_TEST;
1846                err = fb_set_var(info, &var);
1847                fb_var_to_videomode(&mode, &var);
1848                if (err || !fb_mode_is_equal(m, &mode)) {
1849                        list_del(pos);
1850                        kfree(pos);
1851                }
1852        }
1853
1854        err = 1;
1855
1856        if (!list_empty(&info->modelist)) {
1857                if (!lock_fb_info(info))
1858                        return -ENODEV;
1859                event.info = info;
1860                err = fb_notifier_call_chain(FB_EVENT_NEW_MODELIST, &event);
1861                unlock_fb_info(info);
1862        }
1863
1864        return err;
1865}
1866
1867static char *video_options[FB_MAX] __read_mostly;
1868static int ofonly __read_mostly;
1869
1870/**
1871 * fb_get_options - get kernel boot parameters
1872 * @name:   framebuffer name as it would appear in
1873 *          the boot parameter line
1874 *          (video=<name>:<options>)
1875 * @option: the option will be stored here
1876 *
1877 * NOTE: Needed to maintain backwards compatibility
1878 */
1879int fb_get_options(char *name, char **option)
1880{
1881        char *opt, *options = NULL;
1882        int retval = 0;
1883        int name_len = strlen(name), i;
1884
1885        if (name_len && ofonly && strncmp(name, "offb", 4))
1886                retval = 1;
1887
1888        if (name_len && !retval) {
1889                for (i = 0; i < FB_MAX; i++) {
1890                        if (video_options[i] == NULL)
1891                                continue;
1892                        if (!video_options[i][0])
1893                                continue;
1894                        opt = video_options[i];
1895                        if (!strncmp(name, opt, name_len) &&
1896                            opt[name_len] == ':')
1897                                options = opt + name_len + 1;
1898                }
1899        }
1900        if (options && !strncmp(options, "off", 3))
1901                retval = 1;
1902
1903        if (option)
1904                *option = options;
1905
1906        return retval;
1907}
1908
1909#ifndef MODULE
1910/**
1911 *      video_setup - process command line options
1912 *      @options: string of options
1913 *
1914 *      Process command line options for frame buffer subsystem.
1915 *
1916 *      NOTE: This function is a __setup and __init function.
1917 *            It only stores the options.  Drivers have to call
1918 *            fb_get_options() as necessary.
1919 *
1920 *      Returns zero.
1921 *
1922 */
1923static int __init video_setup(char *options)
1924{
1925        int i, global = 0;
1926
1927        if (!options || !*options)
1928                global = 1;
1929
1930        if (!global && !strncmp(options, "ofonly", 6)) {
1931                ofonly = 1;
1932                global = 1;
1933        }
1934
1935        if (!global && !strchr(options, ':')) {
1936                fb_mode_option = options;
1937                global = 1;
1938        }
1939
1940        if (!global) {
1941                for (i = 0; i < FB_MAX; i++) {
1942                        if (video_options[i] == NULL) {
1943                                video_options[i] = options;
1944                                break;
1945                        }
1946
1947                }
1948        }
1949
1950        return 1;
1951}
1952__setup("video=", video_setup);
1953#endif
1954
1955    /*
1956     *  Visible symbols for modules
1957     */
1958
1959EXPORT_SYMBOL(register_framebuffer);
1960EXPORT_SYMBOL(unregister_framebuffer);
1961EXPORT_SYMBOL(num_registered_fb);
1962EXPORT_SYMBOL(registered_fb);
1963EXPORT_SYMBOL(fb_show_logo);
1964EXPORT_SYMBOL(fb_set_var);
1965EXPORT_SYMBOL(fb_blank);
1966EXPORT_SYMBOL(fb_pan_display);
1967EXPORT_SYMBOL(fb_get_buffer_offset);
1968EXPORT_SYMBOL(fb_set_suspend);
1969EXPORT_SYMBOL(fb_get_options);
1970
1971MODULE_LICENSE("GPL");
1972
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