drivers/video/uvesafb.c

   1 /*
   2  * A framebuffer driver for VBE 2.0+ compliant video cards
   3  *
   4  * (c) 2007 Michal Januszewski <spock@gentoo.org>
   5  *     Loosely based upon the vesafb driver.
   6  *
   7  */
   8 #include <linux/init.h>
   9 #include <linux/module.h>
  10 #include <linux/moduleparam.h>
  11 #include <linux/skbuff.h>
  12 #include <linux/timer.h>
  13 #include <linux/completion.h>
  14 #include <linux/connector.h>
  15 #include <linux/random.h>
  16 #include <linux/platform_device.h>
  17 #include <linux/limits.h>
  18 #include <linux/fb.h>
  19 #include <linux/io.h>
  20 #include <linux/mutex.h>
  21 #include <linux/slab.h>
  22 #include <video/edid.h>
  23 #include <video/uvesafb.h>
  24 #ifdef CONFIG_X86
  25 #include <video/vga.h>
  26 #endif
  27 #include "edid.h"
  28
  29 static struct cb_id uvesafb_cn_id = {
  30         .idx = CN_IDX_V86D,
  31         .val = CN_VAL_V86D_UVESAFB
  32 };
  33 static char v86d_path[PATH_MAX] = "/sbin/v86d";
  34 static char v86d_started;       /* has v86d been started by uvesafb? */
  35
  36 static struct fb_fix_screeninfo uvesafb_fix = {
  37         .id     = "VESA VGA",
  38         .type   = FB_TYPE_PACKED_PIXELS,
  39         .accel  = FB_ACCEL_NONE,
  40         .visual = FB_VISUAL_TRUECOLOR,
  41 };
  42
  43 static int mtrr         = 3;    /* enable mtrr by default */
  44 static bool blank       = 1;    /* enable blanking by default */
  45 static int ypan         = 1;    /* 0: scroll, 1: ypan, 2: ywrap */
  46 static bool pmi_setpal  = true; /* use PMI for palette changes */
  47 static bool nocrtc;             /* ignore CRTC settings */
  48 static bool noedid;             /* don't try DDC transfers */
  49 static int vram_remap;          /* set amt. of memory to be used */
  50 static int vram_total;          /* set total amount of memory */
  51 static u16 maxclk;              /* maximum pixel clock */
  52 static u16 maxvf;               /* maximum vertical frequency */
  53 static u16 maxhf;               /* maximum horizontal frequency */
  54 static u16 vbemode;             /* force use of a specific VBE mode */
  55 static char *mode_option;
  56 static u8  dac_width    = 6;
  57
  58 static struct uvesafb_ktask *uvfb_tasks[UVESAFB_TASKS_MAX];
  59 static DEFINE_MUTEX(uvfb_lock);
  60
  61 /*
  62  * A handler for replies from userspace.
  63  *
  64  * Make sure each message passes consistency checks and if it does,
  65  * find the kernel part of the task struct, copy the registers and
  66  * the buffer contents and then complete the task.
  67  */
  68 static void uvesafb_cn_callback(struct cn_msg *msg, struct netlink_skb_parms *nsp)
  69 {
  70         struct uvesafb_task *utask;
  71         struct uvesafb_ktask *task;
  72
  73         if (!capable(CAP_SYS_ADMIN))
  74                 return;
  75
  76         if (msg->seq >= UVESAFB_TASKS_MAX)
  77                 return;
  78
  79         mutex_lock(&uvfb_lock);
  80         task = uvfb_tasks[msg->seq];
  81
  82         if (!task || msg->ack != task->ack) {
  83                 mutex_unlock(&uvfb_lock);
  84                 return;
  85         }
  86
  87         utask = (struct uvesafb_task *)msg->data;
  88
  89         /* Sanity checks for the buffer length. */
  90         if (task->t.buf_len < utask->buf_len ||
  91             utask->buf_len > msg->len - sizeof(*utask)) {
  92                 mutex_unlock(&uvfb_lock);
  93                 return;
  94         }
  95
  96         uvfb_tasks[msg->seq] = NULL;
  97         mutex_unlock(&uvfb_lock);
  98
  99         memcpy(&task->t, utask, sizeof(*utask));
 100
 101         if (task->t.buf_len && task->buf)
 102                 memcpy(task->buf, utask + 1, task->t.buf_len);
 103
 104         complete(task->done);
 105         return;
 106 }
 107
 108 static int uvesafb_helper_start(void)
 109 {
 110         char *envp[] = {
 111                 "HOME=/",
 112                 "PATH=/sbin:/bin",
 113                 NULL,
 114         };
 115
 116         char *argv[] = {
 117                 v86d_path,
 118                 NULL,
 119         };
 120
 121         return call_usermodehelper(v86d_path, argv, envp, UMH_WAIT_PROC);
 122 }
 123
 124 /*
 125  * Execute a uvesafb task.
 126  *
 127  * Returns 0 if the task is executed successfully.
 128  *
 129  * A message sent to the userspace consists of the uvesafb_task
 130  * struct and (optionally) a buffer. The uvesafb_task struct is
 131  * a simplified version of uvesafb_ktask (its kernel counterpart)
 132  * containing only the register values, flags and the length of
 133  * the buffer.
 134  *
 135  * Each message is assigned a sequence number (increased linearly)
 136  * and a random ack number. The sequence number is used as a key
 137  * for the uvfb_tasks array which holds pointers to uvesafb_ktask
 138  * structs for all requests.
 139  */
 140 static int uvesafb_exec(struct uvesafb_ktask *task)
 141 {
 142         static int seq;
 143         struct cn_msg *m;
 144         int err;
 145         int len = sizeof(task->t) + task->t.buf_len;
 146
 147         /*
 148          * Check whether the message isn't longer than the maximum
 149          * allowed by connector.
 150          */
 151         if (sizeof(*m) + len > CONNECTOR_MAX_MSG_SIZE) {
 152                 printk(KERN_WARNING "uvesafb: message too long (%d), "
 153                         "can't execute task\n", (int)(sizeof(*m) + len));
 154                 return -E2BIG;
 155         }
 156
 157         m = kzalloc(sizeof(*m) + len, GFP_KERNEL);
 158         if (!m)
 159                 return -ENOMEM;
 160
 161         init_completion(task->done);
 162
 163         memcpy(&m->id, &uvesafb_cn_id, sizeof(m->id));
 164         m->seq = seq;
 165         m->len = len;
 166         m->ack = prandom_u32();
 167
 168         /* uvesafb_task structure */
 169         memcpy(m + 1, &task->t, sizeof(task->t));
 170
 171         /* Buffer */
 172         memcpy((u8 *)(m + 1) + sizeof(task->t), task->buf, task->t.buf_len);
 173
 174         /*
 175          * Save the message ack number so that we can find the kernel
 176          * part of this task when a reply is received from userspace.
 177          */
 178         task->ack = m->ack;
 179
 180         mutex_lock(&uvfb_lock);
 181
 182         /* If all slots are taken -- bail out. */
 183         if (uvfb_tasks[seq]) {
 184                 mutex_unlock(&uvfb_lock);
 185                 err = -EBUSY;
 186                 goto out;
 187         }
 188
 189         /* Save a pointer to the kernel part of the task struct. */
 190         uvfb_tasks[seq] = task;
 191         mutex_unlock(&uvfb_lock);
 192
 193         err = cn_netlink_send(m, 0, GFP_KERNEL);
 194         if (err == -ESRCH) {
 195                 /*
 196                  * Try to start the userspace helper if sending
 197                  * the request failed the first time.
 198                  */
 199                 err = uvesafb_helper_start();
 200                 if (err) {
 201                         printk(KERN_ERR "uvesafb: failed to execute %s\n",
 202                                         v86d_path);
 203                         printk(KERN_ERR "uvesafb: make sure that the v86d "
 204                                         "helper is installed and executable\n");
 205                 } else {
 206                         v86d_started = 1;
 207                         err = cn_netlink_send(m, 0, gfp_any());
 208                         if (err == -ENOBUFS)
 209                                 err = 0;
 210                 }
 211         } else if (err == -ENOBUFS)
 212                 err = 0;
 213
 214         if (!err && !(task->t.flags & TF_EXIT))
 215                 err = !wait_for_completion_timeout(task->done,
 216                                 msecs_to_jiffies(UVESAFB_TIMEOUT));
 217
 218         mutex_lock(&uvfb_lock);
 219         uvfb_tasks[seq] = NULL;
 220         mutex_unlock(&uvfb_lock);
 221
 222         seq++;
 223         if (seq >= UVESAFB_TASKS_MAX)
 224                 seq = 0;
 225 out:
 226         kfree(m);
 227         return err;
 228 }
 229
 230 /*
 231  * Free a uvesafb_ktask struct.
 232  */
 233 static void uvesafb_free(struct uvesafb_ktask *task)
 234 {
 235         if (task) {
 236                 if (task->done)
 237                         kfree(task->done);
 238                 kfree(task);
 239         }
 240 }
 241
 242 /*
 243  * Prepare a uvesafb_ktask struct to be used again.
 244  */
 245 static void uvesafb_reset(struct uvesafb_ktask *task)
 246 {
 247         struct completion *cpl = task->done;
 248
 249         memset(task, 0, sizeof(*task));
 250         task->done = cpl;
 251 }
 252
 253 /*
 254  * Allocate and prepare a uvesafb_ktask struct.
 255  */
 256 static struct uvesafb_ktask *uvesafb_prep(void)
 257 {
 258         struct uvesafb_ktask *task;
 259
 260         task = kzalloc(sizeof(*task), GFP_KERNEL);
 261         if (task) {
 262                 task->done = kzalloc(sizeof(*task->done), GFP_KERNEL);
 263                 if (!task->done) {
 264                         kfree(task);
 265                         task = NULL;
 266                 }
 267         }
 268         return task;
 269 }
 270
 271 static void uvesafb_setup_var(struct fb_var_screeninfo *var,
 272                 struct fb_info *info, struct vbe_mode_ib *mode)
 273 {
 274         struct uvesafb_par *par = info->par;
 275
 276         var->vmode = FB_VMODE_NONINTERLACED;
 277         var->sync = FB_SYNC_VERT_HIGH_ACT;
 278
 279         var->xres = mode->x_res;
 280         var->yres = mode->y_res;
 281         var->xres_virtual = mode->x_res;
 282         var->yres_virtual = (par->ypan) ?
 283                         info->fix.smem_len / mode->bytes_per_scan_line :
 284                         mode->y_res;
 285         var->xoffset = 0;
 286         var->yoffset = 0;
 287         var->bits_per_pixel = mode->bits_per_pixel;
 288
 289         if (var->bits_per_pixel == 15)
 290                 var->bits_per_pixel = 16;
 291
 292         if (var->bits_per_pixel > 8) {
 293                 var->red.offset    = mode->red_off;
 294                 var->red.length    = mode->red_len;
 295                 var->green.offset  = mode->green_off;
 296                 var->green.length  = mode->green_len;
 297                 var->blue.offset   = mode->blue_off;
 298                 var->blue.length   = mode->blue_len;
 299                 var->transp.offset = mode->rsvd_off;
 300                 var->transp.length = mode->rsvd_len;
 301         } else {
 302                 var->red.offset    = 0;
 303                 var->green.offset  = 0;
 304                 var->blue.offset   = 0;
 305                 var->transp.offset = 0;
 306
 307                 var->red.length    = 8;
 308                 var->green.length  = 8;
 309                 var->blue.length   = 8;
 310                 var->transp.length = 0;
 311         }
 312 }
 313
 314 static int uvesafb_vbe_find_mode(struct uvesafb_par *par,
 315                 int xres, int yres, int depth, unsigned char flags)
 316 {
 317         int i, match = -1, h = 0, d = 0x7fffffff;
 318
 319         for (i = 0; i < par->vbe_modes_cnt; i++) {
 320                 h = abs(par->vbe_modes[i].x_res - xres) +
 321                     abs(par->vbe_modes[i].y_res - yres) +
 322                     abs(depth - par->vbe_modes[i].depth);
 323
 324                 /*
 325                  * We have an exact match in terms of resolution
 326                  * and depth.
 327                  */
 328                 if (h == 0)
 329                         return i;
 330
 331                 if (h < d || (h == d && par->vbe_modes[i].depth > depth)) {
 332                         d = h;
 333                         match = i;
 334                 }
 335         }
 336         i = 1;
 337
 338         if (flags & UVESAFB_EXACT_DEPTH &&
 339                         par->vbe_modes[match].depth != depth)
 340                 i = 0;
 341
 342         if (flags & UVESAFB_EXACT_RES && d > 24)
 343                 i = 0;
 344
 345         if (i != 0)
 346                 return match;
 347         else
 348                 return -1;
 349 }
 350
 351 static u8 *uvesafb_vbe_state_save(struct uvesafb_par *par)
 352 {
 353         struct uvesafb_ktask *task;
 354         u8 *state;
 355         int err;
 356
 357         if (!par->vbe_state_size)
 358                 return NULL;
 359
 360         state = kmalloc(par->vbe_state_size, GFP_KERNEL);
 361         if (!state)
 362                 return ERR_PTR(-ENOMEM);
 363
 364         task = uvesafb_prep();
 365         if (!task) {
 366                 kfree(state);
 367                 return NULL;
 368         }
 369
 370         task->t.regs.eax = 0x4f04;
 371         task->t.regs.ecx = 0x000f;
 372         task->t.regs.edx = 0x0001;
 373         task->t.flags = TF_BUF_RET | TF_BUF_ESBX;
 374         task->t.buf_len = par->vbe_state_size;
 375         task->buf = state;
 376         err = uvesafb_exec(task);
 377
 378         if (err || (task->t.regs.eax & 0xffff) != 0x004f) {
 379                 printk(KERN_WARNING "uvesafb: VBE get state call "
 380                                 "failed (eax=0x%x, err=%d)\n",
 381                                 task->t.regs.eax, err);
 382                 kfree(state);
 383                 state = NULL;
 384         }
 385
 386         uvesafb_free(task);
 387         return state;
 388 }
 389
 390 static void uvesafb_vbe_state_restore(struct uvesafb_par *par, u8 *state_buf)
 391 {
 392         struct uvesafb_ktask *task;
 393         int err;
 394
 395         if (!state_buf)
 396                 return;
 397
 398         task = uvesafb_prep();
 399         if (!task)
 400                 return;
 401
 402         task->t.regs.eax = 0x4f04;
 403         task->t.regs.ecx = 0x000f;
 404         task->t.regs.edx = 0x0002;
 405         task->t.buf_len = par->vbe_state_size;
 406         task->t.flags = TF_BUF_ESBX;
 407         task->buf = state_buf;
 408
 409         err = uvesafb_exec(task);
 410         if (err || (task->t.regs.eax & 0xffff) != 0x004f)
 411                 printk(KERN_WARNING "uvesafb: VBE state restore call "
 412                                 "failed (eax=0x%x, err=%d)\n",
 413                                 task->t.regs.eax, err);
 414
 415         uvesafb_free(task);
 416 }
 417
 418 static int uvesafb_vbe_getinfo(struct uvesafb_ktask *task,
 419                                struct uvesafb_par *par)
 420 {
 421         int err;
 422
 423         task->t.regs.eax = 0x4f00;
 424         task->t.flags = TF_VBEIB;
 425         task->t.buf_len = sizeof(struct vbe_ib);
 426         task->buf = &par->vbe_ib;
 427         strncpy(par->vbe_ib.vbe_signature, "VBE2", 4);
 428
 429         err = uvesafb_exec(task);
 430         if (err || (task->t.regs.eax & 0xffff) != 0x004f) {
 431                 printk(KERN_ERR "uvesafb: Getting VBE info block failed "
 432                                 "(eax=0x%x, err=%d)\n", (u32)task->t.regs.eax,
 433                                 err);
 434                 return -EINVAL;
 435         }
 436
 437         if (par->vbe_ib.vbe_version < 0x0200) {
 438                 printk(KERN_ERR "uvesafb: Sorry, pre-VBE 2.0 cards are "
 439                                 "not supported.\n");
 440                 return -EINVAL;
 441         }
 442
 443         if (!par->vbe_ib.mode_list_ptr) {
 444                 printk(KERN_ERR "uvesafb: Missing mode list!\n");
 445                 return -EINVAL;
 446         }
 447
 448         printk(KERN_INFO "uvesafb: ");
 449
 450         /*
 451          * Convert string pointers and the mode list pointer into
 452          * usable addresses. Print informational messages about the
 453          * video adapter and its vendor.
 454          */
 455         if (par->vbe_ib.oem_vendor_name_ptr)
 456                 printk("%s, ",
 457                         ((char *)task->buf) + par->vbe_ib.oem_vendor_name_ptr);
 458
 459         if (par->vbe_ib.oem_product_name_ptr)
 460                 printk("%s, ",
 461                         ((char *)task->buf) + par->vbe_ib.oem_product_name_ptr);
 462
 463         if (par->vbe_ib.oem_product_rev_ptr)
 464                 printk("%s, ",
 465                         ((char *)task->buf) + par->vbe_ib.oem_product_rev_ptr);
 466
 467         if (par->vbe_ib.oem_string_ptr)
 468                 printk("OEM: %s, ",
 469                         ((char *)task->buf) + par->vbe_ib.oem_string_ptr);
 470
 471         printk("VBE v%d.%d\n", ((par->vbe_ib.vbe_version & 0xff00) >> 8),
 472                         par->vbe_ib.vbe_version & 0xff);
 473
 474         return 0;
 475 }
 476
 477 static int uvesafb_vbe_getmodes(struct uvesafb_ktask *task,
 478                                 struct uvesafb_par *par)
 479 {
 480         int off = 0, err;
 481         u16 *mode;
 482
 483         par->vbe_modes_cnt = 0;
 484
 485         /* Count available modes. */
 486         mode = (u16 *) (((u8 *)&par->vbe_ib) + par->vbe_ib.mode_list_ptr);
 487         while (*mode != 0xffff) {
 488                 par->vbe_modes_cnt++;
 489                 mode++;
 490         }
 491
 492         par->vbe_modes = kzalloc(sizeof(struct vbe_mode_ib) *
 493                                 par->vbe_modes_cnt, GFP_KERNEL);
 494         if (!par->vbe_modes)
 495                 return -ENOMEM;
 496
 497         /* Get info about all available modes. */
 498         mode = (u16 *) (((u8 *)&par->vbe_ib) + par->vbe_ib.mode_list_ptr);
 499         while (*mode != 0xffff) {
 500                 struct vbe_mode_ib *mib;
 501
 502                 uvesafb_reset(task);
 503                 task->t.regs.eax = 0x4f01;
 504                 task->t.regs.ecx = (u32) *mode;
 505                 task->t.flags = TF_BUF_RET | TF_BUF_ESDI;
 506                 task->t.buf_len = sizeof(struct vbe_mode_ib);
 507                 task->buf = par->vbe_modes + off;
 508
 509                 err = uvesafb_exec(task);
 510                 if (err || (task->t.regs.eax & 0xffff) != 0x004f) {
 511                         printk(KERN_WARNING "uvesafb: Getting mode info block "
 512                                 "for mode 0x%x failed (eax=0x%x, err=%d)\n",
 513                                 *mode, (u32)task->t.regs.eax, err);
 514                         mode++;
 515                         par->vbe_modes_cnt--;
 516                         continue;
 517                 }
 518
 519                 mib = task->buf;
 520                 mib->mode_id = *mode;
 521
 522                 /*
 523                  * We only want modes that are supported with the current
 524                  * hardware configuration, color, graphics and that have
 525                  * support for the LFB.
 526                  */
 527                 if ((mib->mode_attr & VBE_MODE_MASK) == VBE_MODE_MASK &&
 528                                  mib->bits_per_pixel >= 8)
 529                         off++;
 530                 else
 531                         par->vbe_modes_cnt--;
 532
 533                 mode++;
 534                 mib->depth = mib->red_len + mib->green_len + mib->blue_len;
 535
 536                 /*
 537                  * Handle 8bpp modes and modes with broken color component
 538                  * lengths.
 539                  */
 540                 if (mib->depth == 0 || (mib->depth == 24 &&
 541                                         mib->bits_per_pixel == 32))
 542                         mib->depth = mib->bits_per_pixel;
 543         }
 544
 545         if (par->vbe_modes_cnt > 0)
 546                 return 0;
 547         else
 548                 return -EINVAL;
 549 }
 550
 551 /*
 552  * The Protected Mode Interface is 32-bit x86 code, so we only run it on
 553  * x86 and not x86_64.
 554  */
 555 #ifdef CONFIG_X86_32
 556 static int uvesafb_vbe_getpmi(struct uvesafb_ktask *task,
 557                               struct uvesafb_par *par)
 558 {
 559         int i, err;
 560
 561         uvesafb_reset(task);
 562         task->t.regs.eax = 0x4f0a;
 563         task->t.regs.ebx = 0x0;
 564         err = uvesafb_exec(task);
 565
 566         if ((task->t.regs.eax & 0xffff) != 0x4f || task->t.regs.es < 0xc000) {
 567                 par->pmi_setpal = par->ypan = 0;
 568         } else {
 569                 par->pmi_base = (u16 *)phys_to_virt(((u32)task->t.regs.es << 4)
 570                                                 + task->t.regs.edi);
 571                 par->pmi_start = (u8 *)par->pmi_base + par->pmi_base[1];
 572                 par->pmi_pal = (u8 *)par->pmi_base + par->pmi_base[2];
 573                 printk(KERN_INFO "uvesafb: protected mode interface info at "
 574                                  "%04x:%04x\n",
 575                                  (u16)task->t.regs.es, (u16)task->t.regs.edi);
 576                 printk(KERN_INFO "uvesafb: pmi: set display start = %p, "
 577                                  "set palette = %p\n", par->pmi_start,
 578                                  par->pmi_pal);
 579
 580                 if (par->pmi_base[3]) {
 581                         printk(KERN_INFO "uvesafb: pmi: ports = ");
 582                         for (i = par->pmi_base[3]/2;
 583                                         par->pmi_base[i] != 0xffff; i++)
 584                                 printk("%x ", par->pmi_base[i]);
 585                         printk("\n");
 586
 587                         if (par->pmi_base[i] != 0xffff) {
 588                                 printk(KERN_INFO "uvesafb: can't handle memory"
 589                                                  " requests, pmi disabled\n");
 590                                 par->ypan = par->pmi_setpal = 0;
 591                         }
 592                 }
 593         }
 594         return 0;
 595 }
 596 #endif /* CONFIG_X86_32 */
 597
 598 /*
 599  * Check whether a video mode is supported by the Video BIOS and is
 600  * compatible with the monitor limits.
 601  */
 602 static int uvesafb_is_valid_mode(struct fb_videomode *mode,
 603                                  struct fb_info *info)
 604 {
 605         if (info->monspecs.gtf) {
 606                 fb_videomode_to_var(&info->var, mode);
 607                 if (fb_validate_mode(&info->var, info))
 608                         return 0;
 609         }
 610
 611         if (uvesafb_vbe_find_mode(info->par, mode->xres, mode->yres, 8,
 612                                 UVESAFB_EXACT_RES) == -1)
 613                 return 0;
 614
 615         return 1;
 616 }
 617
 618 static int uvesafb_vbe_getedid(struct uvesafb_ktask *task, struct fb_info *info)
 619 {
 620         struct uvesafb_par *par = info->par;
 621         int err = 0;
 622
 623         if (noedid || par->vbe_ib.vbe_version < 0x0300)
 624                 return -EINVAL;
 625
 626         task->t.regs.eax = 0x4f15;
 627         task->t.regs.ebx = 0;
 628         task->t.regs.ecx = 0;
 629         task->t.buf_len = 0;
 630         task->t.flags = 0;
 631
 632         err = uvesafb_exec(task);
 633
 634         if ((task->t.regs.eax & 0xffff) != 0x004f || err)
 635                 return -EINVAL;
 636
 637         if ((task->t.regs.ebx & 0x3) == 3) {
 638                 printk(KERN_INFO "uvesafb: VBIOS/hardware supports both "
 639                                  "DDC1 and DDC2 transfers\n");
 640         } else if ((task->t.regs.ebx & 0x3) == 2) {
 641                 printk(KERN_INFO "uvesafb: VBIOS/hardware supports DDC2 "
 642                                  "transfers\n");
 643         } else if ((task->t.regs.ebx & 0x3) == 1) {
 644                 printk(KERN_INFO "uvesafb: VBIOS/hardware supports DDC1 "
 645                                  "transfers\n");
 646         } else {
 647                 printk(KERN_INFO "uvesafb: VBIOS/hardware doesn't support "
 648                                  "DDC transfers\n");
 649                 return -EINVAL;
 650         }
 651
 652         task->t.regs.eax = 0x4f15;
 653         task->t.regs.ebx = 1;
 654         task->t.regs.ecx = task->t.regs.edx = 0;
 655         task->t.flags = TF_BUF_RET | TF_BUF_ESDI;
 656         task->t.buf_len = EDID_LENGTH;
 657         task->buf = kzalloc(EDID_LENGTH, GFP_KERNEL);
 658         if (!task->buf)
 659                 return -ENOMEM;
 660
 661         err = uvesafb_exec(task);
 662
 663         if ((task->t.regs.eax & 0xffff) == 0x004f && !err) {
 664                 fb_edid_to_monspecs(task->buf, &info->monspecs);
 665
 666                 if (info->monspecs.vfmax && info->monspecs.hfmax) {
 667                         /*
 668                          * If the maximum pixel clock wasn't specified in
 669                          * the EDID block, set it to 300 MHz.
 670                          */
 671                         if (info->monspecs.dclkmax == 0)
 672                                 info->monspecs.dclkmax = 300 * 1000000;
 673                         info->monspecs.gtf = 1;
 674                 }
 675         } else {
 676                 err = -EINVAL;
 677         }
 678
 679         kfree(task->buf);
 680         return err;
 681 }
 682
 683 static void uvesafb_vbe_getmonspecs(struct uvesafb_ktask *task,
 684                                     struct fb_info *info)
 685 {
 686         struct uvesafb_par *par = info->par;
 687         int i;
 688
 689         memset(&info->monspecs, 0, sizeof(info->monspecs));
 690
 691         /*
 692          * If we don't get all necessary data from the EDID block,
 693          * mark it as incompatible with the GTF and set nocrtc so
 694          * that we always use the default BIOS refresh rate.
 695          */
 696         if (uvesafb_vbe_getedid(task, info)) {
 697                 info->monspecs.gtf = 0;
 698                 par->nocrtc = 1;
 699         }
 700
 701         /* Kernel command line overrides. */
 702         if (maxclk)
 703                 info->monspecs.dclkmax = maxclk * 1000000;
 704         if (maxvf)
 705                 info->monspecs.vfmax = maxvf;
 706         if (maxhf)
 707                 info->monspecs.hfmax = maxhf * 1000;
 708
 709         /*
 710          * In case DDC transfers are not supported, the user can provide
 711          * monitor limits manually. Lower limits are set to "safe" values.
 712          */
 713         if (info->monspecs.gtf == 0 && maxclk && maxvf && maxhf) {
 714                 info->monspecs.dclkmin = 0;
 715                 info->monspecs.vfmin = 60;
 716                 info->monspecs.hfmin = 29000;
 717                 info->monspecs.gtf = 1;
 718                 par->nocrtc = 0;
 719         }
 720
 721         if (info->monspecs.gtf)
 722                 printk(KERN_INFO
 723                         "uvesafb: monitor limits: vf = %d Hz, hf = %d kHz, "
 724                         "clk = %d MHz\n", info->monspecs.vfmax,
 725                         (int)(info->monspecs.hfmax / 1000),
 726                         (int)(info->monspecs.dclkmax / 1000000));
 727         else
 728                 printk(KERN_INFO "uvesafb: no monitor limits have been set, "
 729                                  "default refresh rate will be used\n");
 730
 731         /* Add VBE modes to the modelist. */
 732         for (i = 0; i < par->vbe_modes_cnt; i++) {
 733                 struct fb_var_screeninfo var;
 734                 struct vbe_mode_ib *mode;
 735                 struct fb_videomode vmode;
 736
 737                 mode = &par->vbe_modes[i];
 738                 memset(&var, 0, sizeof(var));
 739
 740                 var.xres = mode->x_res;
 741                 var.yres = mode->y_res;
 742
 743                 fb_get_mode(FB_VSYNCTIMINGS | FB_IGNOREMON, 60, &var, info);
 744                 fb_var_to_videomode(&vmode, &var);
 745                 fb_add_videomode(&vmode, &info->modelist);
 746         }
 747
 748         /* Add valid VESA modes to our modelist. */
 749         for (i = 0; i < VESA_MODEDB_SIZE; i++) {
 750                 if (uvesafb_is_valid_mode((struct fb_videomode *)
 751                                                 &vesa_modes[i], info))
 752                         fb_add_videomode(&vesa_modes[i], &info->modelist);
 753         }
 754
 755         for (i = 0; i < info->monspecs.modedb_len; i++) {
 756                 if (uvesafb_is_valid_mode(&info->monspecs.modedb[i], info))
 757                         fb_add_videomode(&info->monspecs.modedb[i],
 758                                         &info->modelist);
 759         }
 760
 761         return;
 762 }
 763
 764 static void uvesafb_vbe_getstatesize(struct uvesafb_ktask *task,
 765                                      struct uvesafb_par *par)
 766 {
 767         int err;
 768
 769         uvesafb_reset(task);
 770
 771         /*
 772          * Get the VBE state buffer size. We want all available
 773          * hardware state data (CL = 0x0f).
 774          */
 775         task->t.regs.eax = 0x4f04;
 776         task->t.regs.ecx = 0x000f;
 777         task->t.regs.edx = 0x0000;
 778         task->t.flags = 0;
 779
 780         err = uvesafb_exec(task);
 781
 782         if (err || (task->t.regs.eax & 0xffff) != 0x004f) {
 783                 printk(KERN_WARNING "uvesafb: VBE state buffer size "
 784                         "cannot be determined (eax=0x%x, err=%d)\n",
 785                         task->t.regs.eax, err);
 786                 par->vbe_state_size = 0;
 787                 return;
 788         }
 789
 790         par->vbe_state_size = 64 * (task->t.regs.ebx & 0xffff);
 791 }
 792
 793 static int uvesafb_vbe_init(struct fb_info *info)
 794 {
 795         struct uvesafb_ktask *task = NULL;
 796         struct uvesafb_par *par = info->par;
 797         int err;
 798
 799         task = uvesafb_prep();
 800         if (!task)
 801                 return -ENOMEM;
 802
 803         err = uvesafb_vbe_getinfo(task, par);
 804         if (err)
 805                 goto out;
 806
 807         err = uvesafb_vbe_getmodes(task, par);
 808         if (err)
 809                 goto out;
 810
 811         par->nocrtc = nocrtc;
 812 #ifdef CONFIG_X86_32
 813         par->pmi_setpal = pmi_setpal;
 814         par->ypan = ypan;
 815
 816         if (par->pmi_setpal || par->ypan) {
 817                 if (__supported_pte_mask & _PAGE_NX) {
 818                         par->pmi_setpal = par->ypan = 0;
 819                         printk(KERN_WARNING "uvesafb: NX protection is active, "
 820                                             "better not use the PMI.\n");
 821                 } else {
 822                         uvesafb_vbe_getpmi(task, par);
 823                 }
 824         }
 825 #else
 826         /* The protected mode interface is not available on non-x86. */
 827         par->pmi_setpal = par->ypan = 0;
 828 #endif
 829
 830         INIT_LIST_HEAD(&info->modelist);
 831         uvesafb_vbe_getmonspecs(task, info);
 832         uvesafb_vbe_getstatesize(task, par);
 833
 834 out:    uvesafb_free(task);
 835         return err;
 836 }
 837
 838 static int uvesafb_vbe_init_mode(struct fb_info *info)
 839 {
 840         struct list_head *pos;
 841         struct fb_modelist *modelist;
 842         struct fb_videomode *mode;
 843         struct uvesafb_par *par = info->par;
 844         int i, modeid;
 845
 846         /* Has the user requested a specific VESA mode? */
 847         if (vbemode) {
 848                 for (i = 0; i < par->vbe_modes_cnt; i++) {
 849                         if (par->vbe_modes[i].mode_id == vbemode) {
 850                                 modeid = i;
 851                                 uvesafb_setup_var(&info->var, info,
 852                                                 &par->vbe_modes[modeid]);
 853                                 fb_get_mode(FB_VSYNCTIMINGS | FB_IGNOREMON, 60,
 854                                                 &info->var, info);
 855                                 /*
 856                                  * With pixclock set to 0, the default BIOS
 857                                  * timings will be used in set_par().
 858                                  */
 859                                 info->var.pixclock = 0;
 860                                 goto gotmode;
 861                         }
 862                 }
 863                 printk(KERN_INFO "uvesafb: requested VBE mode 0x%x is "
 864                                  "unavailable\n", vbemode);
 865                 vbemode = 0;
 866         }
 867
 868         /* Count the modes in the modelist */
 869         i = 0;
 870         list_for_each(pos, &info->modelist)
 871                 i++;
 872
 873         /*
 874          * Convert the modelist into a modedb so that we can use it with
 875          * fb_find_mode().
 876          */
 877         mode = kzalloc(i * sizeof(*mode), GFP_KERNEL);
 878         if (mode) {
 879                 i = 0;
 880                 list_for_each(pos, &info->modelist) {
 881                         modelist = list_entry(pos, struct fb_modelist, list);
 882                         mode[i] = modelist->mode;
 883                         i++;
 884                 }
 885
 886                 if (!mode_option)
 887                         mode_option = UVESAFB_DEFAULT_MODE;
 888
 889                 i = fb_find_mode(&info->var, info, mode_option, mode, i,
 890                         NULL, 8);
 891
 892                 kfree(mode);
 893         }
 894
 895         /* fb_find_mode() failed */
 896         if (i == 0) {
 897                 info->var.xres = 640;
 898                 info->var.yres = 480;
 899                 mode = (struct fb_videomode *)
 900                                 fb_find_best_mode(&info->var, &info->modelist);
 901
 902                 if (mode) {
 903                         fb_videomode_to_var(&info->var, mode);
 904                 } else {
 905                         modeid = par->vbe_modes[0].mode_id;
 906                         uvesafb_setup_var(&info->var, info,
 907                                         &par->vbe_modes[modeid]);
 908                         fb_get_mode(FB_VSYNCTIMINGS | FB_IGNOREMON, 60,
 909                                         &info->var, info);
 910
 911                         goto gotmode;
 912                 }
 913         }
 914
 915         /* Look for a matching VBE mode. */
 916         modeid = uvesafb_vbe_find_mode(par, info->var.xres, info->var.yres,
 917                         info->var.bits_per_pixel, UVESAFB_EXACT_RES);
 918
 919         if (modeid == -1)
 920                 return -EINVAL;
 921
 922         uvesafb_setup_var(&info->var, info, &par->vbe_modes[modeid]);
 923
 924 gotmode:
 925         /*
 926          * If we are not VBE3.0+ compliant, we're done -- the BIOS will
 927          * ignore our timings anyway.
 928          */
 929         if (par->vbe_ib.vbe_version < 0x0300 || par->nocrtc)
 930                 fb_get_mode(FB_VSYNCTIMINGS | FB_IGNOREMON, 60,
 931                                         &info->var, info);
 932
 933         return modeid;
 934 }
 935
 936 static int uvesafb_setpalette(struct uvesafb_pal_entry *entries, int count,
 937                 int start, struct fb_info *info)
 938 {
 939         struct uvesafb_ktask *task;
 940 #ifdef CONFIG_X86
 941         struct uvesafb_par *par = info->par;
 942         int i = par->mode_idx;
 943 #endif
 944         int err = 0;
 945
 946         /*
 947          * We support palette modifications for 8 bpp modes only, so
 948          * there can never be more than 256 entries.
 949          */
 950         if (start + count > 256)
 951                 return -EINVAL;
 952
 953 #ifdef CONFIG_X86
 954         /* Use VGA registers if mode is VGA-compatible. */
 955         if (i >= 0 && i < par->vbe_modes_cnt &&
 956             par->vbe_modes[i].mode_attr & VBE_MODE_VGACOMPAT) {
 957                 for (i = 0; i < count; i++) {
 958                         outb_p(start + i,        dac_reg);
 959                         outb_p(entries[i].red,   dac_val);
 960                         outb_p(entries[i].green, dac_val);
 961                         outb_p(entries[i].blue,  dac_val);
 962                 }
 963         }
 964 #ifdef CONFIG_X86_32
 965         else if (par->pmi_setpal) {
 966                 __asm__ __volatile__(
 967                 "call *(%%esi)"
 968                 : /* no return value */
 969                 : "a" (0x4f09),         /* EAX */
 970                   "b" (0),              /* EBX */
 971                   "c" (count),          /* ECX */
 972                   "d" (start),          /* EDX */
 973                   "D" (entries),        /* EDI */
 974                   "S" (&par->pmi_pal)); /* ESI */
 975         }
 976 #endif /* CONFIG_X86_32 */
 977         else
 978 #endif /* CONFIG_X86 */
 979         {
 980                 task = uvesafb_prep();
 981                 if (!task)
 982                         return -ENOMEM;
 983
 984                 task->t.regs.eax = 0x4f09;
 985                 task->t.regs.ebx = 0x0;
 986                 task->t.regs.ecx = count;
 987                 task->t.regs.edx = start;
 988                 task->t.flags = TF_BUF_ESDI;
 989                 task->t.buf_len = sizeof(struct uvesafb_pal_entry) * count;
 990                 task->buf = entries;
 991
 992                 err = uvesafb_exec(task);
 993                 if ((task->t.regs.eax & 0xffff) != 0x004f)
 994                         err = 1;
 995
 996                 uvesafb_free(task);
 997         }
 998         return err;
 999 }
1000
1001 static int uvesafb_setcolreg(unsigned regno, unsigned red, unsigned green,
1002                 unsigned blue, unsigned transp,
1003                 struct fb_info *info)
1004 {
1005         struct uvesafb_pal_entry entry;
1006         int shift = 16 - dac_width;
1007         int err = 0;
1008
1009         if (regno >= info->cmap.len)
1010                 return -EINVAL;
1011
1012         if (info->var.bits_per_pixel == 8) {
1013                 entry.red   = red   >> shift;
1014                 entry.green = green >> shift;
1015                 entry.blue  = blue  >> shift;
1016                 entry.pad   = 0;
1017
1018                 err = uvesafb_setpalette(&entry, 1, regno, info);
1019         } else if (regno < 16) {
1020                 switch (info->var.bits_per_pixel) {
1021                 case 16:
1022                         if (info->var.red.offset == 10) {
1023                                 /* 1:5:5:5 */
1024                                 ((u32 *) (info->pseudo_palette))[regno] =
1025                                                 ((red   & 0xf800) >>  1) |
1026                                                 ((green & 0xf800) >>  6) |
1027                                                 ((blue  & 0xf800) >> 11);
1028                         } else {
1029                                 /* 0:5:6:5 */
1030                                 ((u32 *) (info->pseudo_palette))[regno] =
1031                                                 ((red   & 0xf800)      ) |
1032                                                 ((green & 0xfc00) >>  5) |
1033                                                 ((blue  & 0xf800) >> 11);
1034                         }
1035                         break;
1036
1037                 case 24:
1038                 case 32:
1039                         red   >>= 8;
1040                         green >>= 8;
1041                         blue  >>= 8;
1042                         ((u32 *)(info->pseudo_palette))[regno] =
1043                                 (red   << info->var.red.offset)   |
1044                                 (green << info->var.green.offset) |
1045                                 (blue  << info->var.blue.offset);
1046                         break;
1047                 }
1048         }
1049         return err;
1050 }
1051
1052 static int uvesafb_setcmap(struct fb_cmap *cmap, struct fb_info *info)
1053 {
1054         struct uvesafb_pal_entry *entries;
1055         int shift = 16 - dac_width;
1056         int i, err = 0;
1057
1058         if (info->var.bits_per_pixel == 8) {
1059                 if (cmap->start + cmap->len > info->cmap.start +
1060                     info->cmap.len || cmap->start < info->cmap.start)
1061                         return -EINVAL;
1062
1063                 entries = kmalloc(sizeof(*entries) * cmap->len, GFP_KERNEL);
1064                 if (!entries)
1065                         return -ENOMEM;
1066
1067                 for (i = 0; i < cmap->len; i++) {
1068                         entries[i].red   = cmap->red[i]   >> shift;
1069                         entries[i].green = cmap->green[i] >> shift;
1070                         entries[i].blue  = cmap->blue[i]  >> shift;
1071                         entries[i].pad   = 0;
1072                 }
1073                 err = uvesafb_setpalette(entries, cmap->len, cmap->start, info);
1074                 kfree(entries);
1075         } else {
1076                 /*
1077                  * For modes with bpp > 8, we only set the pseudo palette in
1078                  * the fb_info struct. We rely on uvesafb_setcolreg to do all
1079                  * sanity checking.
1080                  */
1081                 for (i = 0; i < cmap->len; i++) {
1082                         err |= uvesafb_setcolreg(cmap->start + i, cmap->red[i],
1083                                                 cmap->green[i], cmap->blue[i],
1084                                                 0, info);
1085                 }
1086         }
1087         return err;
1088 }
1089
1090 static int uvesafb_pan_display(struct fb_var_screeninfo *var,
1091                 struct fb_info *info)
1092 {
1093 #ifdef CONFIG_X86_32
1094         int offset;
1095         struct uvesafb_par *par = info->par;
1096
1097         offset = (var->yoffset * info->fix.line_length + var->xoffset) / 4;
1098
1099         /*
1100          * It turns out it's not the best idea to do panning via vm86,
1101          * so we only allow it if we have a PMI.
1102          */
1103         if (par->pmi_start) {
1104                 __asm__ __volatile__(
1105                         "call *(%%edi)"
1106                         : /* no return value */
1107                         : "a" (0x4f07),         /* EAX */
1108                           "b" (0),              /* EBX */
1109                           "c" (offset),         /* ECX */
1110                           "d" (offset >> 16),   /* EDX */
1111                           "D" (&par->pmi_start));    /* EDI */
1112         }
1113 #endif
1114         return 0;
1115 }
1116
1117 static int uvesafb_blank(int blank, struct fb_info *info)
1118 {
1119         struct uvesafb_ktask *task;
1120         int err = 1;
1121 #ifdef CONFIG_X86
1122         struct uvesafb_par *par = info->par;
1123
1124         if (par->vbe_ib.capabilities & VBE_CAP_VGACOMPAT) {
1125                 int loop = 10000;
1126                 u8 seq = 0, crtc17 = 0;
1127
1128                 if (blank == FB_BLANK_POWERDOWN) {
1129                         seq = 0x20;
1130                         crtc17 = 0x00;
1131                         err = 0;
1132                 } else {
1133                         seq = 0x00;
1134                         crtc17 = 0x80;
1135                         err = (blank == FB_BLANK_UNBLANK) ? 0 : -EINVAL;
1136                 }
1137
1138                 vga_wseq(NULL, 0x00, 0x01);
1139                 seq |= vga_rseq(NULL, 0x01) & ~0x20;
1140                 vga_wseq(NULL, 0x00, seq);
1141
1142                 crtc17 |= vga_rcrt(NULL, 0x17) & ~0x80;
1143                 while (loop--);
1144                 vga_wcrt(NULL, 0x17, crtc17);
1145                 vga_wseq(NULL, 0x00, 0x03);
1146         } else
1147 #endif /* CONFIG_X86 */
1148         {
1149                 task = uvesafb_prep();
1150                 if (!task)
1151                         return -ENOMEM;
1152
1153                 task->t.regs.eax = 0x4f10;
1154                 switch (blank) {
1155                 case FB_BLANK_UNBLANK:
1156                         task->t.regs.ebx = 0x0001;
1157                         break;
1158                 case FB_BLANK_NORMAL:
1159                         task->t.regs.ebx = 0x0101;      /* standby */
1160                         break;
1161                 case FB_BLANK_POWERDOWN:
1162                         task->t.regs.ebx = 0x0401;      /* powerdown */
1163                         break;
1164                 default:
1165                         goto out;
1166                 }
1167
1168                 err = uvesafb_exec(task);
1169                 if (err || (task->t.regs.eax & 0xffff) != 0x004f)
1170                         err = 1;
1171 out:            uvesafb_free(task);
1172         }
1173         return err;
1174 }
1175
1176 static int uvesafb_open(struct fb_info *info, int user)
1177 {
1178         struct uvesafb_par *par = info->par;
1179         int cnt = atomic_read(&par->ref_count);
1180         u8 *buf = NULL;
1181
1182         if (!cnt && par->vbe_state_size) {
1183                 buf =  uvesafb_vbe_state_save(par);
1184                 if (IS_ERR(buf)) {
1185                         printk(KERN_WARNING "uvesafb: save hardware state"
1186                                 "failed, error code is %ld!\n", PTR_ERR(buf));
1187                 } else {
1188                         par->vbe_state_orig = buf;
1189                 }
1190         }
1191
1192         atomic_inc(&par->ref_count);
1193         return 0;
1194 }
1195
1196 static int uvesafb_release(struct fb_info *info, int user)
1197 {
1198         struct uvesafb_ktask *task = NULL;
1199         struct uvesafb_par *par = info->par;
1200         int cnt = atomic_read(&par->ref_count);
1201
1202         if (!cnt)
1203                 return -EINVAL;
1204
1205         if (cnt != 1)
1206                 goto out;
1207
1208         task = uvesafb_prep();
1209         if (!task)
1210                 goto out;
1211
1212         /* First, try to set the standard 80x25 text mode. */
1213         task->t.regs.eax = 0x0003;
1214         uvesafb_exec(task);
1215
1216         /*
1217          * Now try to restore whatever hardware state we might have
1218          * saved when the fb device was first opened.
1219          */
1220         uvesafb_vbe_state_restore(par, par->vbe_state_orig);
1221 out:
1222         atomic_dec(&par->ref_count);
1223         if (task)
1224                 uvesafb_free(task);
1225         return 0;
1226 }
1227
1228 static int uvesafb_set_par(struct fb_info *info)
1229 {
1230         struct uvesafb_par *par = info->par;
1231         struct uvesafb_ktask *task = NULL;
1232         struct vbe_crtc_ib *crtc = NULL;
1233         struct vbe_mode_ib *mode = NULL;
1234         int i, err = 0, depth = info->var.bits_per_pixel;
1235
1236         if (depth > 8 && depth != 32)
1237                 depth = info->var.red.length + info->var.green.length +
1238                         info->var.blue.length;
1239
1240         i = uvesafb_vbe_find_mode(par, info->var.xres, info->var.yres, depth,
1241                                  UVESAFB_EXACT_RES | UVESAFB_EXACT_DEPTH);
1242         if (i >= 0)
1243                 mode = &par->vbe_modes[i];
1244         else
1245                 return -EINVAL;
1246
1247         task = uvesafb_prep();
1248         if (!task)
1249                 return -ENOMEM;
1250 setmode:
1251         task->t.regs.eax = 0x4f02;
1252         task->t.regs.ebx = mode->mode_id | 0x4000;      /* use LFB */
1253
1254         if (par->vbe_ib.vbe_version >= 0x0300 && !par->nocrtc &&
1255             info->var.pixclock != 0) {
1256                 task->t.regs.ebx |= 0x0800;             /* use CRTC data */
1257                 task->t.flags = TF_BUF_ESDI;
1258                 crtc = kzalloc(sizeof(struct vbe_crtc_ib), GFP_KERNEL);
1259                 if (!crtc) {
1260                         err = -ENOMEM;
1261                         goto out;
1262                 }
1263                 crtc->horiz_start = info->var.xres + info->var.right_margin;
1264                 crtc->horiz_end   = crtc->horiz_start + info->var.hsync_len;
1265                 crtc->horiz_total = crtc->horiz_end + info->var.left_margin;
1266
1267                 crtc->vert_start  = info->var.yres + info->var.lower_margin;
1268                 crtc->vert_end    = crtc->vert_start + info->var.vsync_len;
1269                 crtc->vert_total  = crtc->vert_end + info->var.upper_margin;
1270
1271                 crtc->pixel_clock = PICOS2KHZ(info->var.pixclock) * 1000;
1272                 crtc->refresh_rate = (u16)(100 * (crtc->pixel_clock /
1273                                 (crtc->vert_total * crtc->horiz_total)));
1274
1275                 if (info->var.vmode & FB_VMODE_DOUBLE)
1276                         crtc->flags |= 0x1;
1277                 if (info->var.vmode & FB_VMODE_INTERLACED)
1278                         crtc->flags |= 0x2;
1279                 if (!(info->var.sync & FB_SYNC_HOR_HIGH_ACT))
1280                         crtc->flags |= 0x4;
1281                 if (!(info->var.sync & FB_SYNC_VERT_HIGH_ACT))
1282                         crtc->flags |= 0x8;
1283                 memcpy(&par->crtc, crtc, sizeof(*crtc));
1284         } else {
1285                 memset(&par->crtc, 0, sizeof(*crtc));
1286         }
1287
1288         task->t.buf_len = sizeof(struct vbe_crtc_ib);
1289         task->buf = &par->crtc;
1290
1291         err = uvesafb_exec(task);
1292         if (err || (task->t.regs.eax & 0xffff) != 0x004f) {
1293                 /*
1294                  * The mode switch might have failed because we tried to
1295                  * use our own timings.  Try again with the default timings.
1296                  */
1297                 if (crtc != NULL) {
1298                         printk(KERN_WARNING "uvesafb: mode switch failed "
1299                                 "(eax=0x%x, err=%d). Trying again with "
1300                                 "default timings.\n", task->t.regs.eax, err);
1301                         uvesafb_reset(task);
1302                         kfree(crtc);
1303                         crtc = NULL;
1304                         info->var.pixclock = 0;
1305                         goto setmode;
1306                 } else {
1307                         printk(KERN_ERR "uvesafb: mode switch failed (eax="
1308                                 "0x%x, err=%d)\n", task->t.regs.eax, err);
1309                         err = -EINVAL;
1310                         goto out;
1311                 }
1312         }
1313         par->mode_idx = i;
1314
1315         /* For 8bpp modes, always try to set the DAC to 8 bits. */
1316         if (par->vbe_ib.capabilities & VBE_CAP_CAN_SWITCH_DAC &&
1317             mode->bits_per_pixel <= 8) {
1318                 uvesafb_reset(task);
1319                 task->t.regs.eax = 0x4f08;
1320                 task->t.regs.ebx = 0x0800;
1321
1322                 err = uvesafb_exec(task);
1323                 if (err || (task->t.regs.eax & 0xffff) != 0x004f ||
1324                     ((task->t.regs.ebx & 0xff00) >> 8) != 8) {
1325                         dac_width = 6;
1326                 } else {
1327                         dac_width = 8;
1328                 }
1329         }
1330
1331         info->fix.visual = (info->var.bits_per_pixel == 8) ?
1332                                 FB_VISUAL_PSEUDOCOLOR : FB_VISUAL_TRUECOLOR;
1333         info->fix.line_length = mode->bytes_per_scan_line;
1334
1335 out:    if (crtc != NULL)
1336                 kfree(crtc);
1337         uvesafb_free(task);
1338
1339         return err;
1340 }
1341
1342 static void uvesafb_check_limits(struct fb_var_screeninfo *var,
1343                 struct fb_info *info)
1344 {
1345         const struct fb_videomode *mode;
1346         struct uvesafb_par *par = info->par;
1347
1348         /*
1349          * If pixclock is set to 0, then we're using default BIOS timings
1350          * and thus don't have to perform any checks here.
1351          */
1352         if (!var->pixclock)
1353                 return;
1354
1355         if (par->vbe_ib.vbe_version < 0x0300) {
1356                 fb_get_mode(FB_VSYNCTIMINGS | FB_IGNOREMON, 60, var, info);
1357                 return;
1358         }
1359
1360         if (!fb_validate_mode(var, info))
1361                 return;
1362
1363         mode = fb_find_best_mode(var, &info->modelist);
1364         if (mode) {
1365                 if (mode->xres == var->xres && mode->yres == var->yres &&
1366                     !(mode->vmode & (FB_VMODE_INTERLACED | FB_VMODE_DOUBLE))) {
1367                         fb_videomode_to_var(var, mode);
1368                         return;
1369                 }
1370         }
1371
1372         if (info->monspecs.gtf && !fb_get_mode(FB_MAXTIMINGS, 0, var, info))
1373                 return;
1374         /* Use default refresh rate */
1375         var->pixclock = 0;
1376 }
1377
1378 static int uvesafb_check_var(struct fb_var_screeninfo *var,
1379                 struct fb_info *info)
1380 {
1381         struct uvesafb_par *par = info->par;
1382         struct vbe_mode_ib *mode = NULL;
1383         int match = -1;
1384         int depth = var->red.length + var->green.length + var->blue.length;
1385
1386         /*
1387          * Various apps will use bits_per_pixel to set the color depth,
1388          * which is theoretically incorrect, but which we'll try to handle
1389          * here.
1390          */
1391         if (depth == 0 || abs(depth - var->bits_per_pixel) >= 8)
1392                 depth = var->bits_per_pixel;
1393
1394         match = uvesafb_vbe_find_mode(par, var->xres, var->yres, depth,
1395                                                 UVESAFB_EXACT_RES);
1396         if (match == -1)
1397                 return -EINVAL;
1398
1399         mode = &par->vbe_modes[match];
1400         uvesafb_setup_var(var, info, mode);
1401
1402         /*
1403          * Check whether we have remapped enough memory for this mode.
1404          * We might be called at an early stage, when we haven't remapped
1405          * any memory yet, in which case we simply skip the check.
1406          */
1407         if (var->yres * mode->bytes_per_scan_line > info->fix.smem_len
1408                                                 && info->fix.smem_len)
1409                 return -EINVAL;
1410
1411         if ((var->vmode & FB_VMODE_DOUBLE) &&
1412                                 !(par->vbe_modes[match].mode_attr & 0x100))
1413                 var->vmode &= ~FB_VMODE_DOUBLE;
1414
1415         if ((var->vmode & FB_VMODE_INTERLACED) &&
1416                                 !(par->vbe_modes[match].mode_attr & 0x200))
1417                 var->vmode &= ~FB_VMODE_INTERLACED;
1418
1419         uvesafb_check_limits(var, info);
1420
1421         var->xres_virtual = var->xres;
1422         var->yres_virtual = (par->ypan) ?
1423                                 info->fix.smem_len / mode->bytes_per_scan_line :
1424                                 var->yres;
1425         return 0;
1426 }
1427
1428 static struct fb_ops uvesafb_ops = {
1429         .owner          = THIS_MODULE,
1430         .fb_open        = uvesafb_open,
1431         .fb_release     = uvesafb_release,
1432         .fb_setcolreg   = uvesafb_setcolreg,
1433         .fb_setcmap     = uvesafb_setcmap,
1434         .fb_pan_display = uvesafb_pan_display,
1435         .fb_blank       = uvesafb_blank,
1436         .fb_fillrect    = cfb_fillrect,
1437         .fb_copyarea    = cfb_copyarea,
1438         .fb_imageblit   = cfb_imageblit,
1439         .fb_check_var   = uvesafb_check_var,
1440         .fb_set_par     = uvesafb_set_par,
1441 };
1442
1443 static void uvesafb_init_info(struct fb_info *info, struct vbe_mode_ib *mode)
1444 {
1445         unsigned int size_vmode;
1446         unsigned int size_remap;
1447         unsigned int size_total;
1448         struct uvesafb_par *par = info->par;
1449         int i, h;
1450
1451         info->pseudo_palette = ((u8 *)info->par + sizeof(struct uvesafb_par));
1452         info->fix = uvesafb_fix;
1453         info->fix.ypanstep = par->ypan ? 1 : 0;
1454         info->fix.ywrapstep = (par->ypan > 1) ? 1 : 0;
1455
1456         /* Disable blanking if the user requested so. */
1457         if (!blank)
1458                 info->fbops->fb_blank = NULL;
1459
1460         /*
1461          * Find out how much IO memory is required for the mode with
1462          * the highest resolution.
1463          */
1464         size_remap = 0;
1465         for (i = 0; i < par->vbe_modes_cnt; i++) {
1466                 h = par->vbe_modes[i].bytes_per_scan_line *
1467                                         par->vbe_modes[i].y_res;
1468                 if (h > size_remap)
1469                         size_remap = h;
1470         }
1471         size_remap *= 2;
1472
1473         /*
1474          *   size_vmode -- that is the amount of memory needed for the
1475          *                 used video mode, i.e. the minimum amount of
1476          *                 memory we need.
1477          */
1478         if (mode != NULL) {
1479                 size_vmode = info->var.yres * mode->bytes_per_scan_line;
1480         } else {
1481                 size_vmode = info->var.yres * info->var.xres *
1482                              ((info->var.bits_per_pixel + 7) >> 3);
1483         }
1484
1485         /*
1486          *   size_total -- all video memory we have. Used for mtrr
1487          *                 entries, resource allocation and bounds
1488          *                 checking.
1489          */
1490         size_total = par->vbe_ib.total_memory * 65536;
1491         if (vram_total)
1492                 size_total = vram_total * 1024 * 1024;
1493         if (size_total < size_vmode)
1494                 size_total = size_vmode;
1495
1496         /*
1497          *   size_remap -- the amount of video memory we are going to
1498          *                 use for vesafb.  With modern cards it is no
1499          *                 option to simply use size_total as th
1500          *                 wastes plenty of kernel address space.
1501          */
1502         if (vram_remap)
1503                 size_remap = vram_remap * 1024 * 1024;
1504         if (size_remap < size_vmode)
1505                 size_remap = size_vmode;
1506         if (size_remap > size_total)
1507                 size_remap = size_total;
1508
1509         info->fix.smem_len = size_remap;
1510         info->fix.smem_start = mode->phys_base_ptr;
1511
1512         /*
1513          * We have to set yres_virtual here because when setup_var() was
1514          * called, smem_len wasn't defined yet.
1515          */
1516         info->var.yres_virtual = info->fix.smem_len /
1517                                  mode->bytes_per_scan_line;
1518
1519         if (par->ypan && info->var.yres_virtual > info->var.yres) {
1520                 printk(KERN_INFO "uvesafb: scrolling: %s "
1521                         "using protected mode interface, "
1522                         "yres_virtual=%d\n",
1523                         (par->ypan > 1) ? "ywrap" : "ypan",
1524                         info->var.yres_virtual);
1525         } else {
1526                 printk(KERN_INFO "uvesafb: scrolling: redraw\n");
1527                 info->var.yres_virtual = info->var.yres;
1528                 par->ypan = 0;
1529         }
1530
1531         info->flags = FBINFO_FLAG_DEFAULT |
1532                         (par->ypan ? FBINFO_HWACCEL_YPAN : 0);
1533
1534         if (!par->ypan)
1535                 info->fbops->fb_pan_display = NULL;
1536 }
1537
1538 static void uvesafb_init_mtrr(struct fb_info *info)
1539 {
1540         struct uvesafb_par *par = info->par;
1541
1542         if (mtrr && !(info->fix.smem_start & (PAGE_SIZE - 1))) {
1543                 int temp_size = info->fix.smem_len;
1544
1545                 int rc;
1546
1547                 /* Find the largest power-of-two */
1548                 temp_size = roundup_pow_of_two(temp_size);
1549
1550                 /* Try and find a power of two to add */
1551                 do {
1552                         rc = arch_phys_wc_add(info->fix.smem_start, temp_size);
1553                         temp_size >>= 1;
1554                 } while (temp_size >= PAGE_SIZE && rc == -EINVAL);
1555
1556                 if (rc >= 0)
1557                         par->mtrr_handle = rc;
1558         }
1559 }
1560
1561 static void uvesafb_ioremap(struct fb_info *info)
1562 {
1563         info->screen_base = ioremap_wc(info->fix.smem_start, info->fix.smem_len);
1564 }
1565
1566 static ssize_t uvesafb_show_vbe_ver(struct device *dev,
1567                 struct device_attribute *attr, char *buf)
1568 {
1569         struct fb_info *info = platform_get_drvdata(to_platform_device(dev));
1570         struct uvesafb_par *par = info->par;
1571
1572         return snprintf(buf, PAGE_SIZE, "%.4x\n", par->vbe_ib.vbe_version);
1573 }
1574
1575 static DEVICE_ATTR(vbe_version, S_IRUGO, uvesafb_show_vbe_ver, NULL);
1576
1577 static ssize_t uvesafb_show_vbe_modes(struct device *dev,
1578                 struct device_attribute *attr, char *buf)
1579 {
1580         struct fb_info *info = platform_get_drvdata(to_platform_device(dev));
1581         struct uvesafb_par *par = info->par;
1582         int ret = 0, i;
1583
1584         for (i = 0; i < par->vbe_modes_cnt && ret < PAGE_SIZE; i++) {
1585                 ret += snprintf(buf + ret, PAGE_SIZE - ret,
1586                         "%dx%d-%d, 0x%.4x\n",
1587                         par->vbe_modes[i].x_res, par->vbe_modes[i].y_res,
1588                         par->vbe_modes[i].depth, par->vbe_modes[i].mode_id);
1589         }
1590
1591         return ret;
1592 }
1593
1594 static DEVICE_ATTR(vbe_modes, S_IRUGO, uvesafb_show_vbe_modes, NULL);
1595
1596 static ssize_t uvesafb_show_vendor(struct device *dev,
1597                 struct device_attribute *attr, char *buf)
1598 {
1599         struct fb_info *info = platform_get_drvdata(to_platform_device(dev));
1600         struct uvesafb_par *par = info->par;
1601
1602         if (par->vbe_ib.oem_vendor_name_ptr)
1603                 return snprintf(buf, PAGE_SIZE, "%s\n", (char *)
1604                         (&par->vbe_ib) + par->vbe_ib.oem_vendor_name_ptr);
1605         else
1606                 return 0;
1607 }
1608
1609 static DEVICE_ATTR(oem_vendor, S_IRUGO, uvesafb_show_vendor, NULL);
1610
1611 static ssize_t uvesafb_show_product_name(struct device *dev,
1612                 struct device_attribute *attr, char *buf)
1613 {
1614         struct fb_info *info = platform_get_drvdata(to_platform_device(dev));
1615         struct uvesafb_par *par = info->par;
1616
1617         if (par->vbe_ib.oem_product_name_ptr)
1618                 return snprintf(buf, PAGE_SIZE, "%s\n", (char *)
1619                         (&par->vbe_ib) + par->vbe_ib.oem_product_name_ptr);
1620         else
1621                 return 0;
1622 }
1623
1624 static DEVICE_ATTR(oem_product_name, S_IRUGO, uvesafb_show_product_name, NULL);
1625
1626 static ssize_t uvesafb_show_product_rev(struct device *dev,
1627                 struct device_attribute *attr, char *buf)
1628 {
1629         struct fb_info *info = platform_get_drvdata(to_platform_device(dev));
1630         struct uvesafb_par *par = info->par;
1631
1632         if (par->vbe_ib.oem_product_rev_ptr)
1633                 return snprintf(buf, PAGE_SIZE, "%s\n", (char *)
1634                         (&par->vbe_ib) + par->vbe_ib.oem_product_rev_ptr);
1635         else
1636                 return 0;
1637 }
1638
1639 static DEVICE_ATTR(oem_product_rev, S_IRUGO, uvesafb_show_product_rev, NULL);
1640
1641 static ssize_t uvesafb_show_oem_string(struct device *dev,
1642                 struct device_attribute *attr, char *buf)
1643 {
1644         struct fb_info *info = platform_get_drvdata(to_platform_device(dev));
1645         struct uvesafb_par *par = info->par;
1646
1647         if (par->vbe_ib.oem_string_ptr)
1648                 return snprintf(buf, PAGE_SIZE, "%s\n",
1649                         (char *)(&par->vbe_ib) + par->vbe_ib.oem_string_ptr);
1650         else
1651                 return 0;
1652 }
1653
1654 static DEVICE_ATTR(oem_string, S_IRUGO, uvesafb_show_oem_string, NULL);
1655
1656 static ssize_t uvesafb_show_nocrtc(struct device *dev,
1657                 struct device_attribute *attr, char *buf)
1658 {
1659         struct fb_info *info = platform_get_drvdata(to_platform_device(dev));
1660         struct uvesafb_par *par = info->par;
1661
1662         return snprintf(buf, PAGE_SIZE, "%d\n", par->nocrtc);
1663 }
1664
1665 static ssize_t uvesafb_store_nocrtc(struct device *dev,
1666                 struct device_attribute *attr, const char *buf, size_t count)
1667 {
1668         struct fb_info *info = platform_get_drvdata(to_platform_device(dev));
1669         struct uvesafb_par *par = info->par;
1670
1671         if (count > 0) {
1672                 if (buf[0] == '0')
1673                         par->nocrtc = 0;
1674                 else
1675                         par->nocrtc = 1;
1676         }
1677         return count;
1678 }
1679
1680 static DEVICE_ATTR(nocrtc, S_IRUGO | S_IWUSR, uvesafb_show_nocrtc,
1681                         uvesafb_store_nocrtc);
1682
1683 static struct attribute *uvesafb_dev_attrs[] = {
1684         &dev_attr_vbe_version.attr,
1685         &dev_attr_vbe_modes.attr,
1686         &dev_attr_oem_vendor.attr,
1687         &dev_attr_oem_product_name.attr,
1688         &dev_attr_oem_product_rev.attr,
1689         &dev_attr_oem_string.attr,
1690         &dev_attr_nocrtc.attr,
1691         NULL,
1692 };
1693
1694 static struct attribute_group uvesafb_dev_attgrp = {
1695         .name = NULL,
1696         .attrs = uvesafb_dev_attrs,
1697 };
1698
1699 static int uvesafb_probe(struct platform_device *dev)
1700 {
1701         struct fb_info *info;
1702         struct vbe_mode_ib *mode = NULL;
1703         struct uvesafb_par *par;
1704         int err = 0, i;
1705
1706         info = framebuffer_alloc(sizeof(*par) + sizeof(u32) * 256, &dev->dev);
1707         if (!info)
1708                 return -ENOMEM;
1709
1710         par = info->par;
1711
1712         err = uvesafb_vbe_init(info);
1713         if (err) {
1714                 printk(KERN_ERR "uvesafb: vbe_init() failed with %d\n", err);
1715                 goto out;
1716         }
1717
1718         info->fbops = &uvesafb_ops;
1719
1720         i = uvesafb_vbe_init_mode(info);
1721         if (i < 0) {
1722                 err = -EINVAL;
1723                 goto out;
1724         } else {
1725                 mode = &par->vbe_modes[i];
1726         }
1727
1728         if (fb_alloc_cmap(&info->cmap, 256, 0) < 0) {
1729                 err = -ENXIO;
1730                 goto out;
1731         }
1732
1733         uvesafb_init_info(info, mode);
1734
1735         if (!request_region(0x3c0, 32, "uvesafb")) {
1736                 printk(KERN_ERR "uvesafb: request region 0x3c0-0x3e0 failed\n");
1737                 err = -EIO;
1738                 goto out_mode;
1739         }
1740
1741         if (!request_mem_region(info->fix.smem_start, info->fix.smem_len,
1742                                 "uvesafb")) {
1743                 printk(KERN_ERR "uvesafb: cannot reserve video memory at "
1744                                 "0x%lx\n", info->fix.smem_start);
1745                 err = -EIO;
1746                 goto out_reg;
1747         }
1748
1749         uvesafb_init_mtrr(info);
1750         uvesafb_ioremap(info);
1751
1752         if (!info->screen_base) {
1753                 printk(KERN_ERR
1754                         "uvesafb: abort, cannot ioremap 0x%x bytes of video "
1755                         "memory at 0x%lx\n",
1756                         info->fix.smem_len, info->fix.smem_start);
1757                 err = -EIO;
1758                 goto out_mem;
1759         }
1760
1761         platform_set_drvdata(dev, info);
1762
1763         if (register_framebuffer(info) < 0) {
1764                 printk(KERN_ERR
1765                         "uvesafb: failed to register framebuffer device\n");
1766                 err = -EINVAL;
1767                 goto out_unmap;
1768         }
1769
1770         printk(KERN_INFO "uvesafb: framebuffer at 0x%lx, mapped to 0x%p, "
1771                         "using %dk, total %dk\n", info->fix.smem_start,
1772                         info->screen_base, info->fix.smem_len/1024,
1773                         par->vbe_ib.total_memory * 64);
1774         printk(KERN_INFO "fb%d: %s frame buffer device\n", info->node,
1775                         info->fix.id);
1776
1777         err = sysfs_create_group(&dev->dev.kobj, &uvesafb_dev_attgrp);
1778         if (err != 0)
1779                 printk(KERN_WARNING "fb%d: failed to register attributes\n",
1780                         info->node);
1781
1782         return 0;
1783
1784 out_unmap:
1785         iounmap(info->screen_base);
1786 out_mem:
1787         release_mem_region(info->fix.smem_start, info->fix.smem_len);
1788 out_reg:
1789         release_region(0x3c0, 32);
1790 out_mode:
1791         if (!list_empty(&info->modelist))
1792                 fb_destroy_modelist(&info->modelist);
1793         fb_destroy_modedb(info->monspecs.modedb);
1794         fb_dealloc_cmap(&info->cmap);
1795 out:
1796         if (par->vbe_modes)
1797                 kfree(par->vbe_modes);
1798
1799         framebuffer_release(info);
1800         return err;
1801 }
1802
1803 static int uvesafb_remove(struct platform_device *dev)
1804 {
1805         struct fb_info *info = platform_get_drvdata(dev);
1806
1807         if (info) {
1808                 struct uvesafb_par *par = info->par;
1809
1810                 sysfs_remove_group(&dev->dev.kobj, &uvesafb_dev_attgrp);
1811                 unregister_framebuffer(info);
1812                 release_region(0x3c0, 32);
1813                 iounmap(info->screen_base);
1814                 arch_phys_wc_del(par->mtrr_handle);
1815                 release_mem_region(info->fix.smem_start, info->fix.smem_len);
1816                 fb_destroy_modedb(info->monspecs.modedb);
1817                 fb_dealloc_cmap(&info->cmap);
1818
1819                 if (par) {
1820                         if (par->vbe_modes)
1821                                 kfree(par->vbe_modes);
1822                         if (par->vbe_state_orig)
1823                                 kfree(par->vbe_state_orig);
1824                         if (par->vbe_state_saved)
1825                                 kfree(par->vbe_state_saved);
1826                 }
1827
1828                 framebuffer_release(info);
1829         }
1830         return 0;
1831 }
1832
1833 static struct platform_driver uvesafb_driver = {
1834         .probe  = uvesafb_probe,
1835         .remove = uvesafb_remove,
1836         .driver = {
1837                 .name = "uvesafb",
1838         },
1839 };
1840
1841 static struct platform_device *uvesafb_device;
1842
1843 #ifndef MODULE
1844 static int uvesafb_setup(char *options)
1845 {
1846         char *this_opt;
1847
1848         if (!options || !*options)
1849                 return 0;
1850
1851         while ((this_opt = strsep(&options, ",")) != NULL) {
1852                 if (!*this_opt) continue;
1853
1854                 if (!strcmp(this_opt, "redraw"))
1855                         ypan = 0;
1856                 else if (!strcmp(this_opt, "ypan"))
1857                         ypan = 1;
1858                 else if (!strcmp(this_opt, "ywrap"))
1859                         ypan = 2;
1860                 else if (!strcmp(this_opt, "vgapal"))
1861                         pmi_setpal = 0;
1862                 else if (!strcmp(this_opt, "pmipal"))
1863                         pmi_setpal = 1;
1864                 else if (!strncmp(this_opt, "mtrr:", 5))
1865                         mtrr = simple_strtoul(this_opt+5, NULL, 0);
1866                 else if (!strcmp(this_opt, "nomtrr"))
1867                         mtrr = 0;
1868                 else if (!strcmp(this_opt, "nocrtc"))
1869                         nocrtc = 1;
1870                 else if (!strcmp(this_opt, "noedid"))
1871                         noedid = 1;
1872                 else if (!strcmp(this_opt, "noblank"))
1873                         blank = 0;
1874                 else if (!strncmp(this_opt, "vtotal:", 7))
1875                         vram_total = simple_strtoul(this_opt + 7, NULL, 0);
1876                 else if (!strncmp(this_opt, "vremap:", 7))
1877                         vram_remap = simple_strtoul(this_opt + 7, NULL, 0);
1878                 else if (!strncmp(this_opt, "maxhf:", 6))
1879                         maxhf = simple_strtoul(this_opt + 6, NULL, 0);
1880                 else if (!strncmp(this_opt, "maxvf:", 6))
1881                         maxvf = simple_strtoul(this_opt + 6, NULL, 0);
1882                 else if (!strncmp(this_opt, "maxclk:", 7))
1883                         maxclk = simple_strtoul(this_opt + 7, NULL, 0);
1884                 else if (!strncmp(this_opt, "vbemode:", 8))
1885                         vbemode = simple_strtoul(this_opt + 8, NULL, 0);
1886                 else if (this_opt[0] >= '0' && this_opt[0] <= '9') {
1887                         mode_option = this_opt;
1888                 } else {
1889                         printk(KERN_WARNING
1890                                 "uvesafb: unrecognized option %s\n", this_opt);
1891                 }
1892         }
1893
1894         if (mtrr != 3 && mtrr != 0)
1895                 pr_warn("uvesafb: mtrr should be set to 0 or 3; %d is unsupported", mtrr);
1896
1897         return 0;
1898 }
1899 #endif /* !MODULE */
1900
1901 static ssize_t show_v86d(struct device_driver *dev, char *buf)
1902 {
1903         return snprintf(buf, PAGE_SIZE, "%s\n", v86d_path);
1904 }
1905
1906 static ssize_t store_v86d(struct device_driver *dev, const char *buf,
1907                 size_t count)
1908 {
1909         strncpy(v86d_path, buf, PATH_MAX);
1910         return count;
1911 }
1912
1913 static DRIVER_ATTR(v86d, S_IRUGO | S_IWUSR, show_v86d, store_v86d);
1914
1915 static int uvesafb_init(void)
1916 {
1917         int err;
1918
1919 #ifndef MODULE
1920         char *option = NULL;
1921
1922         if (fb_get_options("uvesafb", &option))
1923                 return -ENODEV;
1924         uvesafb_setup(option);
1925 #endif
1926         err = cn_add_callback(&uvesafb_cn_id, "uvesafb", uvesafb_cn_callback);
1927         if (err)
1928                 return err;
1929
1930         err = platform_driver_register(&uvesafb_driver);
1931
1932         if (!err) {
1933                 uvesafb_device = platform_device_alloc("uvesafb", 0);
1934                 if (uvesafb_device)
1935                         err = platform_device_add(uvesafb_device);
1936                 else
1937                         err = -ENOMEM;
1938
1939                 if (err) {
1940                         if (uvesafb_device)
1941                                 platform_device_put(uvesafb_device);
1942                         platform_driver_unregister(&uvesafb_driver);
1943                         cn_del_callback(&uvesafb_cn_id);
1944                         return err;
1945                 }
1946
1947                 err = driver_create_file(&uvesafb_driver.driver,
1948                                 &driver_attr_v86d);
1949                 if (err) {
1950                         printk(KERN_WARNING "uvesafb: failed to register "
1951                                         "attributes\n");
1952                         err = 0;
1953                 }
1954         }
1955         return err;
1956 }
1957
1958 module_init(uvesafb_init);
1959
1960 static void uvesafb_exit(void)
1961 {
1962         struct uvesafb_ktask *task;
1963
1964         if (v86d_started) {
1965                 task = uvesafb_prep();
1966                 if (task) {
1967                         task->t.flags = TF_EXIT;
1968                         uvesafb_exec(task);
1969                         uvesafb_free(task);
1970                 }
1971         }
1972
1973         cn_del_callback(&uvesafb_cn_id);
1974         driver_remove_file(&uvesafb_driver.driver, &driver_attr_v86d);
1975         platform_device_unregister(uvesafb_device);
1976         platform_driver_unregister(&uvesafb_driver);
1977 }
1978
1979 module_exit(uvesafb_exit);
1980
1981 static int param_set_scroll(const char *val, const struct kernel_param *kp)
1982 {
1983         ypan = 0;
1984
1985         if (!strcmp(val, "redraw"))
1986                 ypan = 0;
1987         else if (!strcmp(val, "ypan"))
1988                 ypan = 1;
1989         else if (!strcmp(val, "ywrap"))
1990                 ypan = 2;
1991         else
1992                 return -EINVAL;
1993
1994         return 0;
1995 }
1996 static struct kernel_param_ops param_ops_scroll = {
1997         .set = param_set_scroll,
1998 };
1999 #define param_check_scroll(name, p) __param_check(name, p, void)
2000
2001 module_param_named(scroll, ypan, scroll, 0);
2002 MODULE_PARM_DESC(scroll,
2003         "Scrolling mode, set to 'redraw', 'ypan', or 'ywrap'");
2004 module_param_named(vgapal, pmi_setpal, invbool, 0);
2005 MODULE_PARM_DESC(vgapal, "Set palette using VGA registers");
2006 module_param_named(pmipal, pmi_setpal, bool, 0);
2007 MODULE_PARM_DESC(pmipal, "Set palette using PMI calls");
2008 module_param(mtrr, uint, 0);
2009 MODULE_PARM_DESC(mtrr,
2010         "Memory Type Range Registers setting. Use 0 to disable.");
2011 module_param(blank, bool, 0);
2012 MODULE_PARM_DESC(blank, "Enable hardware blanking");
2013 module_param(nocrtc, bool, 0);
2014 MODULE_PARM_DESC(nocrtc, "Ignore CRTC timings when setting modes");
2015 module_param(noedid, bool, 0);
2016 MODULE_PARM_DESC(noedid,
2017         "Ignore EDID-provided monitor limits when setting modes");
2018 module_param(vram_remap, uint, 0);
2019 MODULE_PARM_DESC(vram_remap, "Set amount of video memory to be used [MiB]");
2020 module_param(vram_total, uint, 0);
2021 MODULE_PARM_DESC(vram_total, "Set total amount of video memoery [MiB]");
2022 module_param(maxclk, ushort, 0);
2023 MODULE_PARM_DESC(maxclk, "Maximum pixelclock [MHz], overrides EDID data");
2024 module_param(maxhf, ushort, 0);
2025 MODULE_PARM_DESC(maxhf,
2026         "Maximum horizontal frequency [kHz], overrides EDID data");
2027 module_param(maxvf, ushort, 0);
2028 MODULE_PARM_DESC(maxvf,
2029         "Maximum vertical frequency [Hz], overrides EDID data");
2030 module_param(mode_option, charp, 0);
2031 MODULE_PARM_DESC(mode_option,
2032         "Specify initial video mode as \"<xres>x<yres>[-<bpp>][@<refresh>]\"");
2033 module_param(vbemode, ushort, 0);
2034 MODULE_PARM_DESC(vbemode,
2035         "VBE mode number to set, overrides the 'mode' option");
2036 module_param_string(v86d, v86d_path, PATH_MAX, 0660);
2037 MODULE_PARM_DESC(v86d, "Path to the v86d userspace helper.");
2038
2039 MODULE_LICENSE("GPL");
2040 MODULE_AUTHOR("Michal Januszewski <spock@gentoo.org>");
2041 MODULE_DESCRIPTION("Framebuffer driver for VBE2.0+ compliant graphics boards");
2042