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 #ifdef CONFIG_MTRR
  28 #include <asm/mtrr.h>
  29 #endif
  30 #include "edid.h"
  31
  32 static struct cb_id uvesafb_cn_id = {
  33         .idx = CN_IDX_V86D,
  34         .val = CN_VAL_V86D_UVESAFB
  35 };
  36 static char v86d_path[PATH_MAX] = "/sbin/v86d";
  37 static char v86d_started;       /* has v86d been started by uvesafb? */
  38
  39 static struct fb_fix_screeninfo uvesafb_fix __devinitdata = {
  40         .id     = "VESA VGA",
  41         .type   = FB_TYPE_PACKED_PIXELS,
  42         .accel  = FB_ACCEL_NONE,
  43         .visual = FB_VISUAL_TRUECOLOR,
  44 };
  45
  46 static int mtrr         __devinitdata = 3; /* enable mtrr by default */
  47 static bool blank       = 1;               /* enable blanking by default */
  48 static int ypan         = 1;             /* 0: scroll, 1: ypan, 2: ywrap */
  49 static bool pmi_setpal  __devinitdata = true; /* use PMI for palette changes */
  50 static bool nocrtc      __devinitdata; /* ignore CRTC settings */
  51 static bool noedid      __devinitdata; /* don't try DDC transfers */
  52 static int vram_remap   __devinitdata; /* set amt. of memory to be used */
  53 static int vram_total   __devinitdata; /* set total amount of memory */
  54 static u16 maxclk       __devinitdata; /* maximum pixel clock */
  55 static u16 maxvf        __devinitdata; /* maximum vertical frequency */
  56 static u16 maxhf        __devinitdata; /* maximum horizontal frequency */
  57 static u16 vbemode      __devinitdata; /* force use of a specific VBE mode */
  58 static char *mode_option __devinitdata;
  59 static u8  dac_width    = 6;
  60
  61 static struct uvesafb_ktask *uvfb_tasks[UVESAFB_TASKS_MAX];
  62 static DEFINE_MUTEX(uvfb_lock);
  63
  64 /*
  65  * A handler for replies from userspace.
  66  *
  67  * Make sure each message passes consistency checks and if it does,
  68  * find the kernel part of the task struct, copy the registers and
  69  * the buffer contents and then complete the task.
  70  */
  71 static void uvesafb_cn_callback(struct cn_msg *msg, struct netlink_skb_parms *nsp)
  72 {
  73         struct uvesafb_task *utask;
  74         struct uvesafb_ktask *task;
  75
  76         if (!capable(CAP_SYS_ADMIN))
  77                 return;
  78
  79         if (msg->seq >= UVESAFB_TASKS_MAX)
  80                 return;
  81
  82         mutex_lock(&uvfb_lock);
  83         task = uvfb_tasks[msg->seq];
  84
  85         if (!task || msg->ack != task->ack) {
  86                 mutex_unlock(&uvfb_lock);
  87                 return;
  88         }
  89
  90         utask = (struct uvesafb_task *)msg->data;
  91
  92         /* Sanity checks for the buffer length. */
  93         if (task->t.buf_len < utask->buf_len ||
  94             utask->buf_len > msg->len - sizeof(*utask)) {
  95                 mutex_unlock(&uvfb_lock);
  96                 return;
  97         }
  98
  99         uvfb_tasks[msg->seq] = NULL;
 100         mutex_unlock(&uvfb_lock);
 101
 102         memcpy(&task->t, utask, sizeof(*utask));
 103
 104         if (task->t.buf_len && task->buf)
 105                 memcpy(task->buf, utask + 1, task->t.buf_len);
 106
 107         complete(task->done);
 108         return;
 109 }
 110
 111 static int uvesafb_helper_start(void)
 112 {
 113         char *envp[] = {
 114                 "HOME=/",
 115                 "PATH=/sbin:/bin",
 116                 NULL,
 117         };
 118
 119         char *argv[] = {
 120                 v86d_path,
 121                 NULL,
 122         };
 123
 124         return call_usermodehelper(v86d_path, argv, envp, UMH_WAIT_PROC);
 125 }
 126
 127 /*
 128  * Execute a uvesafb task.
 129  *
 130  * Returns 0 if the task is executed successfully.
 131  *
 132  * A message sent to the userspace consists of the uvesafb_task
 133  * struct and (optionally) a buffer. The uvesafb_task struct is
 134  * a simplified version of uvesafb_ktask (its kernel counterpart)
 135  * containing only the register values, flags and the length of
 136  * the buffer.
 137  *
 138  * Each message is assigned a sequence number (increased linearly)
 139  * and a random ack number. The sequence number is used as a key
 140  * for the uvfb_tasks array which holds pointers to uvesafb_ktask
 141  * structs for all requests.
 142  */
 143 static int uvesafb_exec(struct uvesafb_ktask *task)
 144 {
 145         static int seq;
 146         struct cn_msg *m;
 147         int err;
 148         int len = sizeof(task->t) + task->t.buf_len;
 149
 150         /*
 151          * Check whether the message isn't longer than the maximum
 152          * allowed by connector.
 153          */
 154         if (sizeof(*m) + len > CONNECTOR_MAX_MSG_SIZE) {
 155                 printk(KERN_WARNING "uvesafb: message too long (%d), "
 156                         "can't execute task\n", (int)(sizeof(*m) + len));
 157                 return -E2BIG;
 158         }
 159
 160         m = kzalloc(sizeof(*m) + len, GFP_KERNEL);
 161         if (!m)
 162                 return -ENOMEM;
 163
 164         init_completion(task->done);
 165
 166         memcpy(&m->id, &uvesafb_cn_id, sizeof(m->id));
 167         m->seq = seq;
 168         m->len = len;
 169         m->ack = random32();
 170
 171         /* uvesafb_task structure */
 172         memcpy(m + 1, &task->t, sizeof(task->t));
 173
 174         /* Buffer */
 175         memcpy((u8 *)(m + 1) + sizeof(task->t), task->buf, task->t.buf_len);
 176
 177         /*
 178          * Save the message ack number so that we can find the kernel
 179          * part of this task when a reply is received from userspace.
 180          */
 181         task->ack = m->ack;
 182
 183         mutex_lock(&uvfb_lock);
 184
 185         /* If all slots are taken -- bail out. */
 186         if (uvfb_tasks[seq]) {
 187                 mutex_unlock(&uvfb_lock);
 188                 err = -EBUSY;
 189                 goto out;
 190         }
 191
 192         /* Save a pointer to the kernel part of the task struct. */
 193         uvfb_tasks[seq] = task;
 194         mutex_unlock(&uvfb_lock);
 195
 196         err = cn_netlink_send(m, 0, GFP_KERNEL);
 197         if (err == -ESRCH) {
 198                 /*
 199                  * Try to start the userspace helper if sending
 200                  * the request failed the first time.
 201                  */
 202                 err = uvesafb_helper_start();
 203                 if (err) {
 204                         printk(KERN_ERR "uvesafb: failed to execute %s\n",
 205                                         v86d_path);
 206                         printk(KERN_ERR "uvesafb: make sure that the v86d "
 207                                         "helper is installed and executable\n");
 208                 } else {
 209                         v86d_started = 1;
 210                         err = cn_netlink_send(m, 0, gfp_any());
 211                         if (err == -ENOBUFS)
 212                                 err = 0;
 213                 }
 214         } else if (err == -ENOBUFS)
 215                 err = 0;
 216
 217         if (!err && !(task->t.flags & TF_EXIT))
 218                 err = !wait_for_completion_timeout(task->done,
 219                                 msecs_to_jiffies(UVESAFB_TIMEOUT));
 220
 221         mutex_lock(&uvfb_lock);
 222         uvfb_tasks[seq] = NULL;
 223         mutex_unlock(&uvfb_lock);
 224
 225         seq++;
 226         if (seq >= UVESAFB_TASKS_MAX)
 227                 seq = 0;
 228 out:
 229         kfree(m);
 230         return err;
 231 }
 232
 233 /*
 234  * Free a uvesafb_ktask struct.
 235  */
 236 static void uvesafb_free(struct uvesafb_ktask *task)
 237 {
 238         if (task) {
 239                 if (task->done)
 240                         kfree(task->done);
 241                 kfree(task);
 242         }
 243 }
 244
 245 /*
 246  * Prepare a uvesafb_ktask struct to be used again.
 247  */
 248 static void uvesafb_reset(struct uvesafb_ktask *task)
 249 {
 250         struct completion *cpl = task->done;
 251
 252         memset(task, 0, sizeof(*task));
 253         task->done = cpl;
 254 }
 255
 256 /*
 257  * Allocate and prepare a uvesafb_ktask struct.
 258  */
 259 static struct uvesafb_ktask *uvesafb_prep(void)
 260 {
 261         struct uvesafb_ktask *task;
 262
 263         task = kzalloc(sizeof(*task), GFP_KERNEL);
 264         if (task) {
 265                 task->done = kzalloc(sizeof(*task->done), GFP_KERNEL);
 266                 if (!task->done) {
 267                         kfree(task);
 268                         task = NULL;
 269                 }
 270         }
 271         return task;
 272 }
 273
 274 static void uvesafb_setup_var(struct fb_var_screeninfo *var,
 275                 struct fb_info *info, struct vbe_mode_ib *mode)
 276 {
 277         struct uvesafb_par *par = info->par;
 278
 279         var->vmode = FB_VMODE_NONINTERLACED;
 280         var->sync = FB_SYNC_VERT_HIGH_ACT;
 281
 282         var->xres = mode->x_res;
 283         var->yres = mode->y_res;
 284         var->xres_virtual = mode->x_res;
 285         var->yres_virtual = (par->ypan) ?
 286                         info->fix.smem_len / mode->bytes_per_scan_line :
 287                         mode->y_res;
 288         var->xoffset = 0;
 289         var->yoffset = 0;
 290         var->bits_per_pixel = mode->bits_per_pixel;
 291
 292         if (var->bits_per_pixel == 15)
 293                 var->bits_per_pixel = 16;
 294
 295         if (var->bits_per_pixel > 8) {
 296                 var->red.offset    = mode->red_off;
 297                 var->red.length    = mode->red_len;
 298                 var->green.offset  = mode->green_off;
 299                 var->green.length  = mode->green_len;
 300                 var->blue.offset   = mode->blue_off;
 301                 var->blue.length   = mode->blue_len;
 302                 var->transp.offset = mode->rsvd_off;
 303                 var->transp.length = mode->rsvd_len;
 304         } else {
 305                 var->red.offset    = 0;
 306                 var->green.offset  = 0;
 307                 var->blue.offset   = 0;
 308                 var->transp.offset = 0;
 309
 310                 var->red.length    = 8;
 311                 var->green.length  = 8;
 312                 var->blue.length   = 8;
 313                 var->transp.length = 0;
 314         }
 315 }
 316
 317 static int uvesafb_vbe_find_mode(struct uvesafb_par *par,
 318                 int xres, int yres, int depth, unsigned char flags)
 319 {
 320         int i, match = -1, h = 0, d = 0x7fffffff;
 321
 322         for (i = 0; i < par->vbe_modes_cnt; i++) {
 323                 h = abs(par->vbe_modes[i].x_res - xres) +
 324                     abs(par->vbe_modes[i].y_res - yres) +
 325                     abs(depth - par->vbe_modes[i].depth);
 326
 327                 /*
 328                  * We have an exact match in terms of resolution
 329                  * and depth.
 330                  */
 331                 if (h == 0)
 332                         return i;
 333
 334                 if (h < d || (h == d && par->vbe_modes[i].depth > depth)) {
 335                         d = h;
 336                         match = i;
 337                 }
 338         }
 339         i = 1;
 340
 341         if (flags & UVESAFB_EXACT_DEPTH &&
 342                         par->vbe_modes[match].depth != depth)
 343                 i = 0;
 344
 345         if (flags & UVESAFB_EXACT_RES && d > 24)
 346                 i = 0;
 347
 348         if (i != 0)
 349                 return match;
 350         else
 351                 return -1;
 352 }
 353
 354 static u8 *uvesafb_vbe_state_save(struct uvesafb_par *par)
 355 {
 356         struct uvesafb_ktask *task;
 357         u8 *state;
 358         int err;
 359
 360         if (!par->vbe_state_size)
 361                 return NULL;
 362
 363         state = kmalloc(par->vbe_state_size, GFP_KERNEL);
 364         if (!state)
 365                 return ERR_PTR(-ENOMEM);
 366
 367         task = uvesafb_prep();
 368         if (!task) {
 369                 kfree(state);
 370                 return NULL;
 371         }
 372
 373         task->t.regs.eax = 0x4f04;
 374         task->t.regs.ecx = 0x000f;
 375         task->t.regs.edx = 0x0001;
 376         task->t.flags = TF_BUF_RET | TF_BUF_ESBX;
 377         task->t.buf_len = par->vbe_state_size;
 378         task->buf = state;
 379         err = uvesafb_exec(task);
 380
 381         if (err || (task->t.regs.eax & 0xffff) != 0x004f) {
 382                 printk(KERN_WARNING "uvesafb: VBE get state call "
 383                                 "failed (eax=0x%x, err=%d)\n",
 384                                 task->t.regs.eax, err);
 385                 kfree(state);
 386                 state = NULL;
 387         }
 388
 389         uvesafb_free(task);
 390         return state;
 391 }
 392
 393 static void uvesafb_vbe_state_restore(struct uvesafb_par *par, u8 *state_buf)
 394 {
 395         struct uvesafb_ktask *task;
 396         int err;
 397
 398         if (!state_buf)
 399                 return;
 400
 401         task = uvesafb_prep();
 402         if (!task)
 403                 return;
 404
 405         task->t.regs.eax = 0x4f04;
 406         task->t.regs.ecx = 0x000f;
 407         task->t.regs.edx = 0x0002;
 408         task->t.buf_len = par->vbe_state_size;
 409         task->t.flags = TF_BUF_ESBX;
 410         task->buf = state_buf;
 411
 412         err = uvesafb_exec(task);
 413         if (err || (task->t.regs.eax & 0xffff) != 0x004f)
 414                 printk(KERN_WARNING "uvesafb: VBE state restore call "
 415                                 "failed (eax=0x%x, err=%d)\n",
 416                                 task->t.regs.eax, err);
 417
 418         uvesafb_free(task);
 419 }
 420
 421 static int __devinit uvesafb_vbe_getinfo(struct uvesafb_ktask *task,
 422                 struct uvesafb_par *par)
 423 {
 424         int err;
 425
 426         task->t.regs.eax = 0x4f00;
 427         task->t.flags = TF_VBEIB;
 428         task->t.buf_len = sizeof(struct vbe_ib);
 429         task->buf = &par->vbe_ib;
 430         strncpy(par->vbe_ib.vbe_signature, "VBE2", 4);
 431
 432         err = uvesafb_exec(task);
 433         if (err || (task->t.regs.eax & 0xffff) != 0x004f) {
 434                 printk(KERN_ERR "uvesafb: Getting VBE info block failed "
 435                                 "(eax=0x%x, err=%d)\n", (u32)task->t.regs.eax,
 436                                 err);
 437                 return -EINVAL;
 438         }
 439
 440         if (par->vbe_ib.vbe_version < 0x0200) {
 441                 printk(KERN_ERR "uvesafb: Sorry, pre-VBE 2.0 cards are "
 442                                 "not supported.\n");
 443                 return -EINVAL;
 444         }
 445
 446         if (!par->vbe_ib.mode_list_ptr) {
 447                 printk(KERN_ERR "uvesafb: Missing mode list!\n");
 448                 return -EINVAL;
 449         }
 450
 451         printk(KERN_INFO "uvesafb: ");
 452
 453         /*
 454          * Convert string pointers and the mode list pointer into
 455          * usable addresses. Print informational messages about the
 456          * video adapter and its vendor.
 457          */
 458         if (par->vbe_ib.oem_vendor_name_ptr)
 459                 printk("%s, ",
 460                         ((char *)task->buf) + par->vbe_ib.oem_vendor_name_ptr);
 461
 462         if (par->vbe_ib.oem_product_name_ptr)
 463                 printk("%s, ",
 464                         ((char *)task->buf) + par->vbe_ib.oem_product_name_ptr);
 465
 466         if (par->vbe_ib.oem_product_rev_ptr)
 467                 printk("%s, ",
 468                         ((char *)task->buf) + par->vbe_ib.oem_product_rev_ptr);
 469
 470         if (par->vbe_ib.oem_string_ptr)
 471                 printk("OEM: %s, ",
 472                         ((char *)task->buf) + par->vbe_ib.oem_string_ptr);
 473
 474         printk("VBE v%d.%d\n", ((par->vbe_ib.vbe_version & 0xff00) >> 8),
 475                         par->vbe_ib.vbe_version & 0xff);
 476
 477         return 0;
 478 }
 479
 480 static int __devinit uvesafb_vbe_getmodes(struct uvesafb_ktask *task,
 481                 struct uvesafb_par *par)
 482 {
 483         int off = 0, err;
 484         u16 *mode;
 485
 486         par->vbe_modes_cnt = 0;
 487
 488         /* Count available modes. */
 489         mode = (u16 *) (((u8 *)&par->vbe_ib) + par->vbe_ib.mode_list_ptr);
 490         while (*mode != 0xffff) {
 491                 par->vbe_modes_cnt++;
 492                 mode++;
 493         }
 494
 495         par->vbe_modes = kzalloc(sizeof(struct vbe_mode_ib) *
 496                                 par->vbe_modes_cnt, GFP_KERNEL);
 497         if (!par->vbe_modes)
 498                 return -ENOMEM;
 499
 500         /* Get info about all available modes. */
 501         mode = (u16 *) (((u8 *)&par->vbe_ib) + par->vbe_ib.mode_list_ptr);
 502         while (*mode != 0xffff) {
 503                 struct vbe_mode_ib *mib;
 504
 505                 uvesafb_reset(task);
 506                 task->t.regs.eax = 0x4f01;
 507                 task->t.regs.ecx = (u32) *mode;
 508                 task->t.flags = TF_BUF_RET | TF_BUF_ESDI;
 509                 task->t.buf_len = sizeof(struct vbe_mode_ib);
 510                 task->buf = par->vbe_modes + off;
 511
 512                 err = uvesafb_exec(task);
 513                 if (err || (task->t.regs.eax & 0xffff) != 0x004f) {
 514                         printk(KERN_WARNING "uvesafb: Getting mode info block "
 515                                 "for mode 0x%x failed (eax=0x%x, err=%d)\n",
 516                                 *mode, (u32)task->t.regs.eax, err);
 517                         mode++;
 518                         par->vbe_modes_cnt--;
 519                         continue;
 520                 }
 521
 522                 mib = task->buf;
 523                 mib->mode_id = *mode;
 524
 525                 /*
 526                  * We only want modes that are supported with the current
 527                  * hardware configuration, color, graphics and that have
 528                  * support for the LFB.
 529                  */
 530                 if ((mib->mode_attr & VBE_MODE_MASK) == VBE_MODE_MASK &&
 531                                  mib->bits_per_pixel >= 8)
 532                         off++;
 533                 else
 534                         par->vbe_modes_cnt--;
 535
 536                 mode++;
 537                 mib->depth = mib->red_len + mib->green_len + mib->blue_len;
 538
 539                 /*
 540                  * Handle 8bpp modes and modes with broken color component
 541                  * lengths.
 542                  */
 543                 if (mib->depth == 0 || (mib->depth == 24 &&
 544                                         mib->bits_per_pixel == 32))
 545                         mib->depth = mib->bits_per_pixel;
 546         }
 547
 548         if (par->vbe_modes_cnt > 0)
 549                 return 0;
 550         else
 551                 return -EINVAL;
 552 }
 553
 554 /*
 555  * The Protected Mode Interface is 32-bit x86 code, so we only run it on
 556  * x86 and not x86_64.
 557  */
 558 #ifdef CONFIG_X86_32
 559 static int __devinit uvesafb_vbe_getpmi(struct uvesafb_ktask *task,
 560                 struct uvesafb_par *par)
 561 {
 562         int i, err;
 563
 564         uvesafb_reset(task);
 565         task->t.regs.eax = 0x4f0a;
 566         task->t.regs.ebx = 0x0;
 567         err = uvesafb_exec(task);
 568
 569         if ((task->t.regs.eax & 0xffff) != 0x4f || task->t.regs.es < 0xc000) {
 570                 par->pmi_setpal = par->ypan = 0;
 571         } else {
 572                 par->pmi_base = (u16 *)phys_to_virt(((u32)task->t.regs.es << 4)
 573                                                 + task->t.regs.edi);
 574                 par->pmi_start = (u8 *)par->pmi_base + par->pmi_base[1];
 575                 par->pmi_pal = (u8 *)par->pmi_base + par->pmi_base[2];
 576                 printk(KERN_INFO "uvesafb: protected mode interface info at "
 577                                  "%04x:%04x\n",
 578                                  (u16)task->t.regs.es, (u16)task->t.regs.edi);
 579                 printk(KERN_INFO "uvesafb: pmi: set display start = %p, "
 580                                  "set palette = %p\n", par->pmi_start,
 581                                  par->pmi_pal);
 582
 583                 if (par->pmi_base[3]) {
 584                         printk(KERN_INFO "uvesafb: pmi: ports = ");
 585                         for (i = par->pmi_base[3]/2;
 586                                         par->pmi_base[i] != 0xffff; i++)
 587                                 printk("%x ", par->pmi_base[i]);
 588                         printk("\n");
 589
 590                         if (par->pmi_base[i] != 0xffff) {
 591                                 printk(KERN_INFO "uvesafb: can't handle memory"
 592                                                  " requests, pmi disabled\n");
 593                                 par->ypan = par->pmi_setpal = 0;
 594                         }
 595                 }
 596         }
 597         return 0;
 598 }
 599 #endif /* CONFIG_X86_32 */
 600
 601 /*
 602  * Check whether a video mode is supported by the Video BIOS and is
 603  * compatible with the monitor limits.
 604  */
 605 static int __devinit uvesafb_is_valid_mode(struct fb_videomode *mode,
 606                 struct fb_info *info)
 607 {
 608         if (info->monspecs.gtf) {
 609                 fb_videomode_to_var(&info->var, mode);
 610                 if (fb_validate_mode(&info->var, info))
 611                         return 0;
 612         }
 613
 614         if (uvesafb_vbe_find_mode(info->par, mode->xres, mode->yres, 8,
 615                                 UVESAFB_EXACT_RES) == -1)
 616                 return 0;
 617
 618         return 1;
 619 }
 620
 621 static int __devinit uvesafb_vbe_getedid(struct uvesafb_ktask *task,
 622                 struct fb_info *info)
 623 {
 624         struct uvesafb_par *par = info->par;
 625         int err = 0;
 626
 627         if (noedid || par->vbe_ib.vbe_version < 0x0300)
 628                 return -EINVAL;
 629
 630         task->t.regs.eax = 0x4f15;
 631         task->t.regs.ebx = 0;
 632         task->t.regs.ecx = 0;
 633         task->t.buf_len = 0;
 634         task->t.flags = 0;
 635
 636         err = uvesafb_exec(task);
 637
 638         if ((task->t.regs.eax & 0xffff) != 0x004f || err)
 639                 return -EINVAL;
 640
 641         if ((task->t.regs.ebx & 0x3) == 3) {
 642                 printk(KERN_INFO "uvesafb: VBIOS/hardware supports both "
 643                                  "DDC1 and DDC2 transfers\n");
 644         } else if ((task->t.regs.ebx & 0x3) == 2) {
 645                 printk(KERN_INFO "uvesafb: VBIOS/hardware supports DDC2 "
 646                                  "transfers\n");
 647         } else if ((task->t.regs.ebx & 0x3) == 1) {
 648                 printk(KERN_INFO "uvesafb: VBIOS/hardware supports DDC1 "
 649                                  "transfers\n");
 650         } else {
 651                 printk(KERN_INFO "uvesafb: VBIOS/hardware doesn't support "
 652                                  "DDC transfers\n");
 653                 return -EINVAL;
 654         }
 655
 656         task->t.regs.eax = 0x4f15;
 657         task->t.regs.ebx = 1;
 658         task->t.regs.ecx = task->t.regs.edx = 0;
 659         task->t.flags = TF_BUF_RET | TF_BUF_ESDI;
 660         task->t.buf_len = EDID_LENGTH;
 661         task->buf = kzalloc(EDID_LENGTH, GFP_KERNEL);
 662         if (!task->buf)
 663                 return -ENOMEM;
 664
 665         err = uvesafb_exec(task);
 666
 667         if ((task->t.regs.eax & 0xffff) == 0x004f && !err) {
 668                 fb_edid_to_monspecs(task->buf, &info->monspecs);
 669
 670                 if (info->monspecs.vfmax && info->monspecs.hfmax) {
 671                         /*
 672                          * If the maximum pixel clock wasn't specified in
 673                          * the EDID block, set it to 300 MHz.
 674                          */
 675                         if (info->monspecs.dclkmax == 0)
 676                                 info->monspecs.dclkmax = 300 * 1000000;
 677                         info->monspecs.gtf = 1;
 678                 }
 679         } else {
 680                 err = -EINVAL;
 681         }
 682
 683         kfree(task->buf);
 684         return err;
 685 }
 686
 687 static void __devinit uvesafb_vbe_getmonspecs(struct uvesafb_ktask *task,
 688                 struct fb_info *info)
 689 {
 690         struct uvesafb_par *par = info->par;
 691         int i;
 692
 693         memset(&info->monspecs, 0, sizeof(info->monspecs));
 694
 695         /*
 696          * If we don't get all necessary data from the EDID block,
 697          * mark it as incompatible with the GTF and set nocrtc so
 698          * that we always use the default BIOS refresh rate.
 699          */
 700         if (uvesafb_vbe_getedid(task, info)) {
 701                 info->monspecs.gtf = 0;
 702                 par->nocrtc = 1;
 703         }
 704
 705         /* Kernel command line overrides. */
 706         if (maxclk)
 707                 info->monspecs.dclkmax = maxclk * 1000000;
 708         if (maxvf)
 709                 info->monspecs.vfmax = maxvf;
 710         if (maxhf)
 711                 info->monspecs.hfmax = maxhf * 1000;
 712
 713         /*
 714          * In case DDC transfers are not supported, the user can provide
 715          * monitor limits manually. Lower limits are set to "safe" values.
 716          */
 717         if (info->monspecs.gtf == 0 && maxclk && maxvf && maxhf) {
 718                 info->monspecs.dclkmin = 0;
 719                 info->monspecs.vfmin = 60;
 720                 info->monspecs.hfmin = 29000;
 721                 info->monspecs.gtf = 1;
 722                 par->nocrtc = 0;
 723         }
 724
 725         if (info->monspecs.gtf)
 726                 printk(KERN_INFO
 727                         "uvesafb: monitor limits: vf = %d Hz, hf = %d kHz, "
 728                         "clk = %d MHz\n", info->monspecs.vfmax,
 729                         (int)(info->monspecs.hfmax / 1000),
 730                         (int)(info->monspecs.dclkmax / 1000000));
 731         else
 732                 printk(KERN_INFO "uvesafb: no monitor limits have been set, "
 733                                  "default refresh rate will be used\n");
 734
 735         /* Add VBE modes to the modelist. */
 736         for (i = 0; i < par->vbe_modes_cnt; i++) {
 737                 struct fb_var_screeninfo var;
 738                 struct vbe_mode_ib *mode;
 739                 struct fb_videomode vmode;
 740
 741                 mode = &par->vbe_modes[i];
 742                 memset(&var, 0, sizeof(var));
 743
 744                 var.xres = mode->x_res;
 745                 var.yres = mode->y_res;
 746
 747                 fb_get_mode(FB_VSYNCTIMINGS | FB_IGNOREMON, 60, &var, info);
 748                 fb_var_to_videomode(&vmode, &var);
 749                 fb_add_videomode(&vmode, &info->modelist);
 750         }
 751
 752         /* Add valid VESA modes to our modelist. */
 753         for (i = 0; i < VESA_MODEDB_SIZE; i++) {
 754                 if (uvesafb_is_valid_mode((struct fb_videomode *)
 755                                                 &vesa_modes[i], info))
 756                         fb_add_videomode(&vesa_modes[i], &info->modelist);
 757         }
 758
 759         for (i = 0; i < info->monspecs.modedb_len; i++) {
 760                 if (uvesafb_is_valid_mode(&info->monspecs.modedb[i], info))
 761                         fb_add_videomode(&info->monspecs.modedb[i],
 762                                         &info->modelist);
 763         }
 764
 765         return;
 766 }
 767
 768 static void __devinit uvesafb_vbe_getstatesize(struct uvesafb_ktask *task,
 769                 struct uvesafb_par *par)
 770 {
 771         int err;
 772
 773         uvesafb_reset(task);
 774
 775         /*
 776          * Get the VBE state buffer size. We want all available
 777          * hardware state data (CL = 0x0f).
 778          */
 779         task->t.regs.eax = 0x4f04;
 780         task->t.regs.ecx = 0x000f;
 781         task->t.regs.edx = 0x0000;
 782         task->t.flags = 0;
 783
 784         err = uvesafb_exec(task);
 785
 786         if (err || (task->t.regs.eax & 0xffff) != 0x004f) {
 787                 printk(KERN_WARNING "uvesafb: VBE state buffer size "
 788                         "cannot be determined (eax=0x%x, err=%d)\n",
 789                         task->t.regs.eax, err);
 790                 par->vbe_state_size = 0;
 791                 return;
 792         }
 793
 794         par->vbe_state_size = 64 * (task->t.regs.ebx & 0xffff);
 795 }
 796
 797 static int __devinit uvesafb_vbe_init(struct fb_info *info)
 798 {
 799         struct uvesafb_ktask *task = NULL;
 800         struct uvesafb_par *par = info->par;
 801         int err;
 802
 803         task = uvesafb_prep();
 804         if (!task)
 805                 return -ENOMEM;
 806
 807         err = uvesafb_vbe_getinfo(task, par);
 808         if (err)
 809                 goto out;
 810
 811         err = uvesafb_vbe_getmodes(task, par);
 812         if (err)
 813                 goto out;
 814
 815         par->nocrtc = nocrtc;
 816 #ifdef CONFIG_X86_32
 817         par->pmi_setpal = pmi_setpal;
 818         par->ypan = ypan;
 819
 820         if (par->pmi_setpal || par->ypan) {
 821                 if (__supported_pte_mask & _PAGE_NX) {
 822                         par->pmi_setpal = par->ypan = 0;
 823                         printk(KERN_WARNING "uvesafb: NX protection is actively."
 824                                 "We have better not to use the PMI.\n");
 825                 } else {
 826                         uvesafb_vbe_getpmi(task, par);
 827                 }
 828         }
 829 #else
 830         /* The protected mode interface is not available on non-x86. */
 831         par->pmi_setpal = par->ypan = 0;
 832 #endif
 833
 834         INIT_LIST_HEAD(&info->modelist);
 835         uvesafb_vbe_getmonspecs(task, info);
 836         uvesafb_vbe_getstatesize(task, par);
 837
 838 out:    uvesafb_free(task);
 839         return err;
 840 }
 841
 842 static int __devinit uvesafb_vbe_init_mode(struct fb_info *info)
 843 {
 844         struct list_head *pos;
 845         struct fb_modelist *modelist;
 846         struct fb_videomode *mode;
 847         struct uvesafb_par *par = info->par;
 848         int i, modeid;
 849
 850         /* Has the user requested a specific VESA mode? */
 851         if (vbemode) {
 852                 for (i = 0; i < par->vbe_modes_cnt; i++) {
 853                         if (par->vbe_modes[i].mode_id == vbemode) {
 854                                 modeid = i;
 855                                 uvesafb_setup_var(&info->var, info,
 856                                                 &par->vbe_modes[modeid]);
 857                                 fb_get_mode(FB_VSYNCTIMINGS | FB_IGNOREMON, 60,
 858                                                 &info->var, info);
 859                                 /*
 860                                  * With pixclock set to 0, the default BIOS
 861                                  * timings will be used in set_par().
 862                                  */
 863                                 info->var.pixclock = 0;
 864                                 goto gotmode;
 865                         }
 866                 }
 867                 printk(KERN_INFO "uvesafb: requested VBE mode 0x%x is "
 868                                  "unavailable\n", vbemode);
 869                 vbemode = 0;
 870         }
 871
 872         /* Count the modes in the modelist */
 873         i = 0;
 874         list_for_each(pos, &info->modelist)
 875                 i++;
 876
 877         /*
 878          * Convert the modelist into a modedb so that we can use it with
 879          * fb_find_mode().
 880          */
 881         mode = kzalloc(i * sizeof(*mode), GFP_KERNEL);
 882         if (mode) {
 883                 i = 0;
 884                 list_for_each(pos, &info->modelist) {
 885                         modelist = list_entry(pos, struct fb_modelist, list);
 886                         mode[i] = modelist->mode;
 887                         i++;
 888                 }
 889
 890                 if (!mode_option)
 891                         mode_option = UVESAFB_DEFAULT_MODE;
 892
 893                 i = fb_find_mode(&info->var, info, mode_option, mode, i,
 894                         NULL, 8);
 895
 896                 kfree(mode);
 897         }
 898
 899         /* fb_find_mode() failed */
 900         if (i == 0) {
 901                 info->var.xres = 640;
 902                 info->var.yres = 480;
 903                 mode = (struct fb_videomode *)
 904                                 fb_find_best_mode(&info->var, &info->modelist);
 905
 906                 if (mode) {
 907                         fb_videomode_to_var(&info->var, mode);
 908                 } else {
 909                         modeid = par->vbe_modes[0].mode_id;
 910                         uvesafb_setup_var(&info->var, info,
 911                                         &par->vbe_modes[modeid]);
 912                         fb_get_mode(FB_VSYNCTIMINGS | FB_IGNOREMON, 60,
 913                                         &info->var, info);
 914
 915                         goto gotmode;
 916                 }
 917         }
 918
 919         /* Look for a matching VBE mode. */
 920         modeid = uvesafb_vbe_find_mode(par, info->var.xres, info->var.yres,
 921                         info->var.bits_per_pixel, UVESAFB_EXACT_RES);
 922
 923         if (modeid == -1)
 924                 return -EINVAL;
 925
 926         uvesafb_setup_var(&info->var, info, &par->vbe_modes[modeid]);
 927
 928 gotmode:
 929         /*
 930          * If we are not VBE3.0+ compliant, we're done -- the BIOS will
 931          * ignore our timings anyway.
 932          */
 933         if (par->vbe_ib.vbe_version < 0x0300 || par->nocrtc)
 934                 fb_get_mode(FB_VSYNCTIMINGS | FB_IGNOREMON, 60,
 935                                         &info->var, info);
 936
 937         return modeid;
 938 }
 939
 940 static int uvesafb_setpalette(struct uvesafb_pal_entry *entries, int count,
 941                 int start, struct fb_info *info)
 942 {
 943         struct uvesafb_ktask *task;
 944 #ifdef CONFIG_X86
 945         struct uvesafb_par *par = info->par;
 946         int i = par->mode_idx;
 947 #endif
 948         int err = 0;
 949
 950         /*
 951          * We support palette modifications for 8 bpp modes only, so
 952          * there can never be more than 256 entries.
 953          */
 954         if (start + count > 256)
 955                 return -EINVAL;
 956
 957 #ifdef CONFIG_X86
 958         /* Use VGA registers if mode is VGA-compatible. */
 959         if (i >= 0 && i < par->vbe_modes_cnt &&
 960             par->vbe_modes[i].mode_attr & VBE_MODE_VGACOMPAT) {
 961                 for (i = 0; i < count; i++) {
 962                         outb_p(start + i,        dac_reg);
 963                         outb_p(entries[i].red,   dac_val);
 964                         outb_p(entries[i].green, dac_val);
 965                         outb_p(entries[i].blue,  dac_val);
 966                 }
 967         }
 968 #ifdef CONFIG_X86_32
 969         else if (par->pmi_setpal) {
 970                 __asm__ __volatile__(
 971                 "call *(%%esi)"
 972                 : /* no return value */
 973                 : "a" (0x4f09),         /* EAX */
 974                   "b" (0),              /* EBX */
 975                   "c" (count),          /* ECX */
 976                   "d" (start),          /* EDX */
 977                   "D" (entries),        /* EDI */
 978                   "S" (&par->pmi_pal)); /* ESI */
 979         }
 980 #endif /* CONFIG_X86_32 */
 981         else
 982 #endif /* CONFIG_X86 */
 983         {
 984                 task = uvesafb_prep();
 985                 if (!task)
 986                         return -ENOMEM;
 987
 988                 task->t.regs.eax = 0x4f09;
 989                 task->t.regs.ebx = 0x0;
 990                 task->t.regs.ecx = count;
 991                 task->t.regs.edx = start;
 992                 task->t.flags = TF_BUF_ESDI;
 993                 task->t.buf_len = sizeof(struct uvesafb_pal_entry) * count;
 994                 task->buf = entries;
 995
 996                 err = uvesafb_exec(task);
 997                 if ((task->t.regs.eax & 0xffff) != 0x004f)
 998                         err = 1;
 999
1000                 uvesafb_free(task);
1001         }
1002         return err;
1003 }
1004
1005 static int uvesafb_setcolreg(unsigned regno, unsigned red, unsigned green,
1006                 unsigned blue, unsigned transp,
1007                 struct fb_info *info)
1008 {
1009         struct uvesafb_pal_entry entry;
1010         int shift = 16 - dac_width;
1011         int err = 0;
1012
1013         if (regno >= info->cmap.len)
1014                 return -EINVAL;
1015
1016         if (info->var.bits_per_pixel == 8) {
1017                 entry.red   = red   >> shift;
1018                 entry.green = green >> shift;
1019                 entry.blue  = blue  >> shift;
1020                 entry.pad   = 0;
1021
1022                 err = uvesafb_setpalette(&entry, 1, regno, info);
1023         } else if (regno < 16) {
1024                 switch (info->var.bits_per_pixel) {
1025                 case 16:
1026                         if (info->var.red.offset == 10) {
1027                                 /* 1:5:5:5 */
1028                                 ((u32 *) (info->pseudo_palette))[regno] =
1029                                                 ((red   & 0xf800) >>  1) |
1030                                                 ((green & 0xf800) >>  6) |
1031                                                 ((blue  & 0xf800) >> 11);
1032                         } else {
1033                                 /* 0:5:6:5 */
1034                                 ((u32 *) (info->pseudo_palette))[regno] =
1035                                                 ((red   & 0xf800)      ) |
1036                                                 ((green & 0xfc00) >>  5) |
1037                                                 ((blue  & 0xf800) >> 11);
1038                         }
1039                         break;
1040
1041                 case 24:
1042                 case 32:
1043                         red   >>= 8;
1044                         green >>= 8;
1045                         blue  >>= 8;
1046                         ((u32 *)(info->pseudo_palette))[regno] =
1047                                 (red   << info->var.red.offset)   |
1048                                 (green << info->var.green.offset) |
1049                                 (blue  << info->var.blue.offset);
1050                         break;
1051                 }
1052         }
1053         return err;
1054 }
1055
1056 static int uvesafb_setcmap(struct fb_cmap *cmap, struct fb_info *info)
1057 {
1058         struct uvesafb_pal_entry *entries;
1059         int shift = 16 - dac_width;
1060         int i, err = 0;
1061
1062         if (info->var.bits_per_pixel == 8) {
1063                 if (cmap->start + cmap->len > info->cmap.start +
1064                     info->cmap.len || cmap->start < info->cmap.start)
1065                         return -EINVAL;
1066
1067                 entries = kmalloc(sizeof(*entries) * cmap->len, GFP_KERNEL);
1068                 if (!entries)
1069                         return -ENOMEM;
1070
1071                 for (i = 0; i < cmap->len; i++) {
1072                         entries[i].red   = cmap->red[i]   >> shift;
1073                         entries[i].green = cmap->green[i] >> shift;
1074                         entries[i].blue  = cmap->blue[i]  >> shift;
1075                         entries[i].pad   = 0;
1076                 }
1077                 err = uvesafb_setpalette(entries, cmap->len, cmap->start, info);
1078                 kfree(entries);
1079         } else {
1080                 /*
1081                  * For modes with bpp > 8, we only set the pseudo palette in
1082                  * the fb_info struct. We rely on uvesafb_setcolreg to do all
1083                  * sanity checking.
1084                  */
1085                 for (i = 0; i < cmap->len; i++) {
1086                         err |= uvesafb_setcolreg(cmap->start + i, cmap->red[i],
1087                                                 cmap->green[i], cmap->blue[i],
1088                                                 0, info);
1089                 }
1090         }
1091         return err;
1092 }
1093
1094 static int uvesafb_pan_display(struct fb_var_screeninfo *var,
1095                 struct fb_info *info)
1096 {
1097 #ifdef CONFIG_X86_32
1098         int offset;
1099         struct uvesafb_par *par = info->par;
1100
1101         offset = (var->yoffset * info->fix.line_length + var->xoffset) / 4;
1102
1103         /*
1104          * It turns out it's not the best idea to do panning via vm86,
1105          * so we only allow it if we have a PMI.
1106          */
1107         if (par->pmi_start) {
1108                 __asm__ __volatile__(
1109                         "call *(%%edi)"
1110                         : /* no return value */
1111                         : "a" (0x4f07),         /* EAX */
1112                           "b" (0),              /* EBX */
1113                           "c" (offset),         /* ECX */
1114                           "d" (offset >> 16),   /* EDX */
1115                           "D" (&par->pmi_start));    /* EDI */
1116         }
1117 #endif
1118         return 0;
1119 }
1120
1121 static int uvesafb_blank(int blank, struct fb_info *info)
1122 {
1123         struct uvesafb_ktask *task;
1124         int err = 1;
1125 #ifdef CONFIG_X86
1126         struct uvesafb_par *par = info->par;
1127
1128         if (par->vbe_ib.capabilities & VBE_CAP_VGACOMPAT) {
1129                 int loop = 10000;
1130                 u8 seq = 0, crtc17 = 0;
1131
1132                 if (blank == FB_BLANK_POWERDOWN) {
1133                         seq = 0x20;
1134                         crtc17 = 0x00;
1135                         err = 0;
1136                 } else {
1137                         seq = 0x00;
1138                         crtc17 = 0x80;
1139                         err = (blank == FB_BLANK_UNBLANK) ? 0 : -EINVAL;
1140                 }
1141
1142                 vga_wseq(NULL, 0x00, 0x01);
1143                 seq |= vga_rseq(NULL, 0x01) & ~0x20;
1144                 vga_wseq(NULL, 0x00, seq);
1145
1146                 crtc17 |= vga_rcrt(NULL, 0x17) & ~0x80;
1147                 while (loop--);
1148                 vga_wcrt(NULL, 0x17, crtc17);
1149                 vga_wseq(NULL, 0x00, 0x03);
1150         } else
1151 #endif /* CONFIG_X86 */
1152         {
1153                 task = uvesafb_prep();
1154                 if (!task)
1155                         return -ENOMEM;
1156
1157                 task->t.regs.eax = 0x4f10;
1158                 switch (blank) {
1159                 case FB_BLANK_UNBLANK:
1160                         task->t.regs.ebx = 0x0001;
1161                         break;
1162                 case FB_BLANK_NORMAL:
1163                         task->t.regs.ebx = 0x0101;      /* standby */
1164                         break;
1165                 case FB_BLANK_POWERDOWN:
1166                         task->t.regs.ebx = 0x0401;      /* powerdown */
1167                         break;
1168                 default:
1169                         goto out;
1170                 }
1171
1172                 err = uvesafb_exec(task);
1173                 if (err || (task->t.regs.eax & 0xffff) != 0x004f)
1174                         err = 1;
1175 out:            uvesafb_free(task);
1176         }
1177         return err;
1178 }
1179
1180 static int uvesafb_open(struct fb_info *info, int user)
1181 {
1182         struct uvesafb_par *par = info->par;
1183         int cnt = atomic_read(&par->ref_count);
1184         u8 *buf = NULL;
1185
1186         if (!cnt && par->vbe_state_size) {
1187                 buf =  uvesafb_vbe_state_save(par);
1188                 if (IS_ERR(buf)) {
1189                         printk(KERN_WARNING "uvesafb: save hardware state"
1190                                 "failed, error code is %ld!\n", PTR_ERR(buf));
1191                 } else {
1192                         par->vbe_state_orig = buf;
1193                 }
1194         }
1195
1196         atomic_inc(&par->ref_count);
1197         return 0;
1198 }
1199
1200 static int uvesafb_release(struct fb_info *info, int user)
1201 {
1202         struct uvesafb_ktask *task = NULL;
1203         struct uvesafb_par *par = info->par;
1204         int cnt = atomic_read(&par->ref_count);
1205
1206         if (!cnt)
1207                 return -EINVAL;
1208
1209         if (cnt != 1)
1210                 goto out;
1211
1212         task = uvesafb_prep();
1213         if (!task)
1214                 goto out;
1215
1216         /* First, try to set the standard 80x25 text mode. */
1217         task->t.regs.eax = 0x0003;
1218         uvesafb_exec(task);
1219
1220         /*
1221          * Now try to restore whatever hardware state we might have
1222          * saved when the fb device was first opened.
1223          */
1224         uvesafb_vbe_state_restore(par, par->vbe_state_orig);
1225 out:
1226         atomic_dec(&par->ref_count);
1227         if (task)
1228                 uvesafb_free(task);
1229         return 0;
1230 }
1231
1232 static int uvesafb_set_par(struct fb_info *info)
1233 {
1234         struct uvesafb_par *par = info->par;
1235         struct uvesafb_ktask *task = NULL;
1236         struct vbe_crtc_ib *crtc = NULL;
1237         struct vbe_mode_ib *mode = NULL;
1238         int i, err = 0, depth = info->var.bits_per_pixel;
1239
1240         if (depth > 8 && depth != 32)
1241                 depth = info->var.red.length + info->var.green.length +
1242                         info->var.blue.length;
1243
1244         i = uvesafb_vbe_find_mode(par, info->var.xres, info->var.yres, depth,
1245                                  UVESAFB_EXACT_RES | UVESAFB_EXACT_DEPTH);
1246         if (i >= 0)
1247                 mode = &par->vbe_modes[i];
1248         else
1249                 return -EINVAL;
1250
1251         task = uvesafb_prep();
1252         if (!task)
1253                 return -ENOMEM;
1254 setmode:
1255         task->t.regs.eax = 0x4f02;
1256         task->t.regs.ebx = mode->mode_id | 0x4000;      /* use LFB */
1257
1258         if (par->vbe_ib.vbe_version >= 0x0300 && !par->nocrtc &&
1259             info->var.pixclock != 0) {
1260                 task->t.regs.ebx |= 0x0800;             /* use CRTC data */
1261                 task->t.flags = TF_BUF_ESDI;
1262                 crtc = kzalloc(sizeof(struct vbe_crtc_ib), GFP_KERNEL);
1263                 if (!crtc) {
1264                         err = -ENOMEM;
1265                         goto out;
1266                 }
1267                 crtc->horiz_start = info->var.xres + info->var.right_margin;
1268                 crtc->horiz_end   = crtc->horiz_start + info->var.hsync_len;
1269                 crtc->horiz_total = crtc->horiz_end + info->var.left_margin;
1270
1271                 crtc->vert_start  = info->var.yres + info->var.lower_margin;
1272                 crtc->vert_end    = crtc->vert_start + info->var.vsync_len;
1273                 crtc->vert_total  = crtc->vert_end + info->var.upper_margin;
1274
1275                 crtc->pixel_clock = PICOS2KHZ(info->var.pixclock) * 1000;
1276                 crtc->refresh_rate = (u16)(100 * (crtc->pixel_clock /
1277                                 (crtc->vert_total * crtc->horiz_total)));
1278
1279                 if (info->var.vmode & FB_VMODE_DOUBLE)
1280                         crtc->flags |= 0x1;
1281                 if (info->var.vmode & FB_VMODE_INTERLACED)
1282                         crtc->flags |= 0x2;
1283                 if (!(info->var.sync & FB_SYNC_HOR_HIGH_ACT))
1284                         crtc->flags |= 0x4;
1285                 if (!(info->var.sync & FB_SYNC_VERT_HIGH_ACT))
1286                         crtc->flags |= 0x8;
1287                 memcpy(&par->crtc, crtc, sizeof(*crtc));
1288         } else {
1289                 memset(&par->crtc, 0, sizeof(*crtc));
1290         }
1291
1292         task->t.buf_len = sizeof(struct vbe_crtc_ib);
1293         task->buf = &par->crtc;
1294
1295         err = uvesafb_exec(task);
1296         if (err || (task->t.regs.eax & 0xffff) != 0x004f) {
1297                 /*
1298                  * The mode switch might have failed because we tried to
1299                  * use our own timings.  Try again with the default timings.
1300                  */
1301                 if (crtc != NULL) {
1302                         printk(KERN_WARNING "uvesafb: mode switch failed "
1303                                 "(eax=0x%x, err=%d). Trying again with "
1304                                 "default timings.\n", task->t.regs.eax, err);
1305                         uvesafb_reset(task);
1306                         kfree(crtc);
1307                         crtc = NULL;
1308                         info->var.pixclock = 0;
1309                         goto setmode;
1310                 } else {
1311                         printk(KERN_ERR "uvesafb: mode switch failed (eax="
1312                                 "0x%x, err=%d)\n", task->t.regs.eax, err);
1313                         err = -EINVAL;
1314                         goto out;
1315                 }
1316         }
1317         par->mode_idx = i;
1318
1319         /* For 8bpp modes, always try to set the DAC to 8 bits. */
1320         if (par->vbe_ib.capabilities & VBE_CAP_CAN_SWITCH_DAC &&
1321             mode->bits_per_pixel <= 8) {
1322                 uvesafb_reset(task);
1323                 task->t.regs.eax = 0x4f08;
1324                 task->t.regs.ebx = 0x0800;
1325
1326                 err = uvesafb_exec(task);
1327                 if (err || (task->t.regs.eax & 0xffff) != 0x004f ||
1328                     ((task->t.regs.ebx & 0xff00) >> 8) != 8) {
1329                         dac_width = 6;
1330                 } else {
1331                         dac_width = 8;
1332                 }
1333         }
1334
1335         info->fix.visual = (info->var.bits_per_pixel == 8) ?
1336                                 FB_VISUAL_PSEUDOCOLOR : FB_VISUAL_TRUECOLOR;
1337         info->fix.line_length = mode->bytes_per_scan_line;
1338
1339 out:    if (crtc != NULL)
1340                 kfree(crtc);
1341         uvesafb_free(task);
1342
1343         return err;
1344 }
1345
1346 static void uvesafb_check_limits(struct fb_var_screeninfo *var,
1347                 struct fb_info *info)
1348 {
1349         const struct fb_videomode *mode;
1350         struct uvesafb_par *par = info->par;
1351
1352         /*
1353          * If pixclock is set to 0, then we're using default BIOS timings
1354          * and thus don't have to perform any checks here.
1355          */
1356         if (!var->pixclock)
1357                 return;
1358
1359         if (par->vbe_ib.vbe_version < 0x0300) {
1360                 fb_get_mode(FB_VSYNCTIMINGS | FB_IGNOREMON, 60, var, info);
1361                 return;
1362         }
1363
1364         if (!fb_validate_mode(var, info))
1365                 return;
1366
1367         mode = fb_find_best_mode(var, &info->modelist);
1368         if (mode) {
1369                 if (mode->xres == var->xres && mode->yres == var->yres &&
1370                     !(mode->vmode & (FB_VMODE_INTERLACED | FB_VMODE_DOUBLE))) {
1371                         fb_videomode_to_var(var, mode);
1372                         return;
1373                 }
1374         }
1375
1376         if (info->monspecs.gtf && !fb_get_mode(FB_MAXTIMINGS, 0, var, info))
1377                 return;
1378         /* Use default refresh rate */
1379         var->pixclock = 0;
1380 }
1381
1382 static int uvesafb_check_var(struct fb_var_screeninfo *var,
1383                 struct fb_info *info)
1384 {
1385         struct uvesafb_par *par = info->par;
1386         struct vbe_mode_ib *mode = NULL;
1387         int match = -1;
1388         int depth = var->red.length + var->green.length + var->blue.length;
1389
1390         /*
1391          * Various apps will use bits_per_pixel to set the color depth,
1392          * which is theoretically incorrect, but which we'll try to handle
1393          * here.
1394          */
1395         if (depth == 0 || abs(depth - var->bits_per_pixel) >= 8)
1396                 depth = var->bits_per_pixel;
1397
1398         match = uvesafb_vbe_find_mode(par, var->xres, var->yres, depth,
1399                                                 UVESAFB_EXACT_RES);
1400         if (match == -1)
1401                 return -EINVAL;
1402
1403         mode = &par->vbe_modes[match];
1404         uvesafb_setup_var(var, info, mode);
1405
1406         /*
1407          * Check whether we have remapped enough memory for this mode.
1408          * We might be called at an early stage, when we haven't remapped
1409          * any memory yet, in which case we simply skip the check.
1410          */
1411         if (var->yres * mode->bytes_per_scan_line > info->fix.smem_len
1412                                                 && info->fix.smem_len)
1413                 return -EINVAL;
1414
1415         if ((var->vmode & FB_VMODE_DOUBLE) &&
1416                                 !(par->vbe_modes[match].mode_attr & 0x100))
1417                 var->vmode &= ~FB_VMODE_DOUBLE;
1418
1419         if ((var->vmode & FB_VMODE_INTERLACED) &&
1420                                 !(par->vbe_modes[match].mode_attr & 0x200))
1421                 var->vmode &= ~FB_VMODE_INTERLACED;
1422
1423         uvesafb_check_limits(var, info);
1424
1425         var->xres_virtual = var->xres;
1426         var->yres_virtual = (par->ypan) ?
1427                                 info->fix.smem_len / mode->bytes_per_scan_line :
1428                                 var->yres;
1429         return 0;
1430 }
1431
1432 static struct fb_ops uvesafb_ops = {
1433         .owner          = THIS_MODULE,
1434         .fb_open        = uvesafb_open,
1435         .fb_release     = uvesafb_release,
1436         .fb_setcolreg   = uvesafb_setcolreg,
1437         .fb_setcmap     = uvesafb_setcmap,
1438         .fb_pan_display = uvesafb_pan_display,
1439         .fb_blank       = uvesafb_blank,
1440         .fb_fillrect    = cfb_fillrect,
1441         .fb_copyarea    = cfb_copyarea,
1442         .fb_imageblit   = cfb_imageblit,
1443         .fb_check_var   = uvesafb_check_var,
1444         .fb_set_par     = uvesafb_set_par,
1445 };
1446
1447 static void __devinit uvesafb_init_info(struct fb_info *info,
1448                 struct vbe_mode_ib *mode)
1449 {
1450         unsigned int size_vmode;
1451         unsigned int size_remap;
1452         unsigned int size_total;
1453         struct uvesafb_par *par = info->par;
1454         int i, h;
1455
1456         info->pseudo_palette = ((u8 *)info->par + sizeof(struct uvesafb_par));
1457         info->fix = uvesafb_fix;
1458         info->fix.ypanstep = par->ypan ? 1 : 0;
1459         info->fix.ywrapstep = (par->ypan > 1) ? 1 : 0;
1460
1461         /* Disable blanking if the user requested so. */
1462         if (!blank)
1463                 info->fbops->fb_blank = NULL;
1464
1465         /*
1466          * Find out how much IO memory is required for the mode with
1467          * the highest resolution.
1468          */
1469         size_remap = 0;
1470         for (i = 0; i < par->vbe_modes_cnt; i++) {
1471                 h = par->vbe_modes[i].bytes_per_scan_line *
1472                                         par->vbe_modes[i].y_res;
1473                 if (h > size_remap)
1474                         size_remap = h;
1475         }
1476         size_remap *= 2;
1477
1478         /*
1479          *   size_vmode -- that is the amount of memory needed for the
1480          *                 used video mode, i.e. the minimum amount of
1481          *                 memory we need.
1482          */
1483         if (mode != NULL) {
1484                 size_vmode = info->var.yres * mode->bytes_per_scan_line;
1485         } else {
1486                 size_vmode = info->var.yres * info->var.xres *
1487                              ((info->var.bits_per_pixel + 7) >> 3);
1488         }
1489
1490         /*
1491          *   size_total -- all video memory we have. Used for mtrr
1492          *                 entries, resource allocation and bounds
1493          *                 checking.
1494          */
1495         size_total = par->vbe_ib.total_memory * 65536;
1496         if (vram_total)
1497                 size_total = vram_total * 1024 * 1024;
1498         if (size_total < size_vmode)
1499                 size_total = size_vmode;
1500
1501         /*
1502          *   size_remap -- the amount of video memory we are going to
1503          *                 use for vesafb.  With modern cards it is no
1504          *                 option to simply use size_total as th
1505          *                 wastes plenty of kernel address space.
1506          */
1507         if (vram_remap)
1508                 size_remap = vram_remap * 1024 * 1024;
1509         if (size_remap < size_vmode)
1510                 size_remap = size_vmode;
1511         if (size_remap > size_total)
1512                 size_remap = size_total;
1513
1514         info->fix.smem_len = size_remap;
1515         info->fix.smem_start = mode->phys_base_ptr;
1516
1517         /*
1518          * We have to set yres_virtual here because when setup_var() was
1519          * called, smem_len wasn't defined yet.
1520          */
1521         info->var.yres_virtual = info->fix.smem_len /
1522                                  mode->bytes_per_scan_line;
1523
1524         if (par->ypan && info->var.yres_virtual > info->var.yres) {
1525                 printk(KERN_INFO "uvesafb: scrolling: %s "
1526                         "using protected mode interface, "
1527                         "yres_virtual=%d\n",
1528                         (par->ypan > 1) ? "ywrap" : "ypan",
1529                         info->var.yres_virtual);
1530         } else {
1531                 printk(KERN_INFO "uvesafb: scrolling: redraw\n");
1532                 info->var.yres_virtual = info->var.yres;
1533                 par->ypan = 0;
1534         }
1535
1536         info->flags = FBINFO_FLAG_DEFAULT |
1537                         (par->ypan ? FBINFO_HWACCEL_YPAN : 0);
1538
1539         if (!par->ypan)
1540                 info->fbops->fb_pan_display = NULL;
1541 }
1542
1543 static void __devinit uvesafb_init_mtrr(struct fb_info *info)
1544 {
1545 #ifdef CONFIG_MTRR
1546         if (mtrr && !(info->fix.smem_start & (PAGE_SIZE - 1))) {
1547                 int temp_size = info->fix.smem_len;
1548                 unsigned int type = 0;
1549
1550                 switch (mtrr) {
1551                 case 1:
1552                         type = MTRR_TYPE_UNCACHABLE;
1553                         break;
1554                 case 2:
1555                         type = MTRR_TYPE_WRBACK;
1556                         break;
1557                 case 3:
1558                         type = MTRR_TYPE_WRCOMB;
1559                         break;
1560                 case 4:
1561                         type = MTRR_TYPE_WRTHROUGH;
1562                         break;
1563                 default:
1564                         type = 0;
1565                         break;
1566                 }
1567
1568                 if (type) {
1569                         int rc;
1570
1571                         /* Find the largest power-of-two */
1572                         temp_size = roundup_pow_of_two(temp_size);
1573
1574                         /* Try and find a power of two to add */
1575                         do {
1576                                 rc = mtrr_add(info->fix.smem_start,
1577                                               temp_size, type, 1);
1578                                 temp_size >>= 1;
1579                         } while (temp_size >= PAGE_SIZE && rc == -EINVAL);
1580                 }
1581         }
1582 #endif /* CONFIG_MTRR */
1583 }
1584
1585 static void __devinit uvesafb_ioremap(struct fb_info *info)
1586 {
1587 #ifdef CONFIG_X86
1588         switch (mtrr) {
1589         case 1: /* uncachable */
1590                 info->screen_base = ioremap_nocache(info->fix.smem_start, info->fix.smem_len);
1591                 break;
1592         case 2: /* write-back */
1593                 info->screen_base = ioremap_cache(info->fix.smem_start, info->fix.smem_len);
1594                 break;
1595         case 3: /* write-combining */
1596                 info->screen_base = ioremap_wc(info->fix.smem_start, info->fix.smem_len);
1597                 break;
1598         case 4: /* write-through */
1599         default:
1600                 info->screen_base = ioremap(info->fix.smem_start, info->fix.smem_len);
1601                 break;
1602         }
1603 #else
1604         info->screen_base = ioremap(info->fix.smem_start, info->fix.smem_len);
1605 #endif /* CONFIG_X86 */
1606 }
1607
1608 static ssize_t uvesafb_show_vbe_ver(struct device *dev,
1609                 struct device_attribute *attr, char *buf)
1610 {
1611         struct fb_info *info = platform_get_drvdata(to_platform_device(dev));
1612         struct uvesafb_par *par = info->par;
1613
1614         return snprintf(buf, PAGE_SIZE, "%.4x\n", par->vbe_ib.vbe_version);
1615 }
1616
1617 static DEVICE_ATTR(vbe_version, S_IRUGO, uvesafb_show_vbe_ver, NULL);
1618
1619 static ssize_t uvesafb_show_vbe_modes(struct device *dev,
1620                 struct device_attribute *attr, char *buf)
1621 {
1622         struct fb_info *info = platform_get_drvdata(to_platform_device(dev));
1623         struct uvesafb_par *par = info->par;
1624         int ret = 0, i;
1625
1626         for (i = 0; i < par->vbe_modes_cnt && ret < PAGE_SIZE; i++) {
1627                 ret += snprintf(buf + ret, PAGE_SIZE - ret,
1628                         "%dx%d-%d, 0x%.4x\n",
1629                         par->vbe_modes[i].x_res, par->vbe_modes[i].y_res,
1630                         par->vbe_modes[i].depth, par->vbe_modes[i].mode_id);
1631         }
1632
1633         return ret;
1634 }
1635
1636 static DEVICE_ATTR(vbe_modes, S_IRUGO, uvesafb_show_vbe_modes, NULL);
1637
1638 static ssize_t uvesafb_show_vendor(struct device *dev,
1639                 struct device_attribute *attr, char *buf)
1640 {
1641         struct fb_info *info = platform_get_drvdata(to_platform_device(dev));
1642         struct uvesafb_par *par = info->par;
1643
1644         if (par->vbe_ib.oem_vendor_name_ptr)
1645                 return snprintf(buf, PAGE_SIZE, "%s\n", (char *)
1646                         (&par->vbe_ib) + par->vbe_ib.oem_vendor_name_ptr);
1647         else
1648                 return 0;
1649 }
1650
1651 static DEVICE_ATTR(oem_vendor, S_IRUGO, uvesafb_show_vendor, NULL);
1652
1653 static ssize_t uvesafb_show_product_name(struct device *dev,
1654                 struct device_attribute *attr, char *buf)
1655 {
1656         struct fb_info *info = platform_get_drvdata(to_platform_device(dev));
1657         struct uvesafb_par *par = info->par;
1658
1659         if (par->vbe_ib.oem_product_name_ptr)
1660                 return snprintf(buf, PAGE_SIZE, "%s\n", (char *)
1661                         (&par->vbe_ib) + par->vbe_ib.oem_product_name_ptr);
1662         else
1663                 return 0;
1664 }
1665
1666 static DEVICE_ATTR(oem_product_name, S_IRUGO, uvesafb_show_product_name, NULL);
1667
1668 static ssize_t uvesafb_show_product_rev(struct device *dev,
1669                 struct device_attribute *attr, char *buf)
1670 {
1671         struct fb_info *info = platform_get_drvdata(to_platform_device(dev));
1672         struct uvesafb_par *par = info->par;
1673
1674         if (par->vbe_ib.oem_product_rev_ptr)
1675                 return snprintf(buf, PAGE_SIZE, "%s\n", (char *)
1676                         (&par->vbe_ib) + par->vbe_ib.oem_product_rev_ptr);
1677         else
1678                 return 0;
1679 }
1680
1681 static DEVICE_ATTR(oem_product_rev, S_IRUGO, uvesafb_show_product_rev, NULL);
1682
1683 static ssize_t uvesafb_show_oem_string(struct device *dev,
1684                 struct device_attribute *attr, char *buf)
1685 {
1686         struct fb_info *info = platform_get_drvdata(to_platform_device(dev));
1687         struct uvesafb_par *par = info->par;
1688
1689         if (par->vbe_ib.oem_string_ptr)
1690                 return snprintf(buf, PAGE_SIZE, "%s\n",
1691                         (char *)(&par->vbe_ib) + par->vbe_ib.oem_string_ptr);
1692         else
1693                 return 0;
1694 }
1695
1696 static DEVICE_ATTR(oem_string, S_IRUGO, uvesafb_show_oem_string, NULL);
1697
1698 static ssize_t uvesafb_show_nocrtc(struct device *dev,
1699                 struct device_attribute *attr, char *buf)
1700 {
1701         struct fb_info *info = platform_get_drvdata(to_platform_device(dev));
1702         struct uvesafb_par *par = info->par;
1703
1704         return snprintf(buf, PAGE_SIZE, "%d\n", par->nocrtc);
1705 }
1706
1707 static ssize_t uvesafb_store_nocrtc(struct device *dev,
1708                 struct device_attribute *attr, const char *buf, size_t count)
1709 {
1710         struct fb_info *info = platform_get_drvdata(to_platform_device(dev));
1711         struct uvesafb_par *par = info->par;
1712
1713         if (count > 0) {
1714                 if (buf[0] == '0')
1715                         par->nocrtc = 0;
1716                 else
1717                         par->nocrtc = 1;
1718         }
1719         return count;
1720 }
1721
1722 static DEVICE_ATTR(nocrtc, S_IRUGO | S_IWUSR, uvesafb_show_nocrtc,
1723                         uvesafb_store_nocrtc);
1724
1725 static struct attribute *uvesafb_dev_attrs[] = {
1726         &dev_attr_vbe_version.attr,
1727         &dev_attr_vbe_modes.attr,
1728         &dev_attr_oem_vendor.attr,
1729         &dev_attr_oem_product_name.attr,
1730         &dev_attr_oem_product_rev.attr,
1731         &dev_attr_oem_string.attr,
1732         &dev_attr_nocrtc.attr,
1733         NULL,
1734 };
1735
1736 static struct attribute_group uvesafb_dev_attgrp = {
1737         .name = NULL,
1738         .attrs = uvesafb_dev_attrs,
1739 };
1740
1741 static int __devinit uvesafb_probe(struct platform_device *dev)
1742 {
1743         struct fb_info *info;
1744         struct vbe_mode_ib *mode = NULL;
1745         struct uvesafb_par *par;
1746         int err = 0, i;
1747
1748         info = framebuffer_alloc(sizeof(*par) + sizeof(u32) * 256, &dev->dev);
1749         if (!info)
1750                 return -ENOMEM;
1751
1752         par = info->par;
1753
1754         err = uvesafb_vbe_init(info);
1755         if (err) {
1756                 printk(KERN_ERR "uvesafb: vbe_init() failed with %d\n", err);
1757                 goto out;
1758         }
1759
1760         info->fbops = &uvesafb_ops;
1761
1762         i = uvesafb_vbe_init_mode(info);
1763         if (i < 0) {
1764                 err = -EINVAL;
1765                 goto out;
1766         } else {
1767                 mode = &par->vbe_modes[i];
1768         }
1769
1770         if (fb_alloc_cmap(&info->cmap, 256, 0) < 0) {
1771                 err = -ENXIO;
1772                 goto out;
1773         }
1774
1775         uvesafb_init_info(info, mode);
1776
1777         if (!request_region(0x3c0, 32, "uvesafb")) {
1778                 printk(KERN_ERR "uvesafb: request region 0x3c0-0x3e0 failed\n");
1779                 err = -EIO;
1780                 goto out_mode;
1781         }
1782
1783         if (!request_mem_region(info->fix.smem_start, info->fix.smem_len,
1784                                 "uvesafb")) {
1785                 printk(KERN_ERR "uvesafb: cannot reserve video memory at "
1786                                 "0x%lx\n", info->fix.smem_start);
1787                 err = -EIO;
1788                 goto out_reg;
1789         }
1790
1791         uvesafb_init_mtrr(info);
1792         uvesafb_ioremap(info);
1793
1794         if (!info->screen_base) {
1795                 printk(KERN_ERR
1796                         "uvesafb: abort, cannot ioremap 0x%x bytes of video "
1797                         "memory at 0x%lx\n",
1798                         info->fix.smem_len, info->fix.smem_start);
1799                 err = -EIO;
1800                 goto out_mem;
1801         }
1802
1803         platform_set_drvdata(dev, info);
1804
1805         if (register_framebuffer(info) < 0) {
1806                 printk(KERN_ERR
1807                         "uvesafb: failed to register framebuffer device\n");
1808                 err = -EINVAL;
1809                 goto out_unmap;
1810         }
1811
1812         printk(KERN_INFO "uvesafb: framebuffer at 0x%lx, mapped to 0x%p, "
1813                         "using %dk, total %dk\n", info->fix.smem_start,
1814                         info->screen_base, info->fix.smem_len/1024,
1815                         par->vbe_ib.total_memory * 64);
1816         printk(KERN_INFO "fb%d: %s frame buffer device\n", info->node,
1817                         info->fix.id);
1818
1819         err = sysfs_create_group(&dev->dev.kobj, &uvesafb_dev_attgrp);
1820         if (err != 0)
1821                 printk(KERN_WARNING "fb%d: failed to register attributes\n",
1822                         info->node);
1823
1824         return 0;
1825
1826 out_unmap:
1827         iounmap(info->screen_base);
1828 out_mem:
1829         release_mem_region(info->fix.smem_start, info->fix.smem_len);
1830 out_reg:
1831         release_region(0x3c0, 32);
1832 out_mode:
1833         if (!list_empty(&info->modelist))
1834                 fb_destroy_modelist(&info->modelist);
1835         fb_destroy_modedb(info->monspecs.modedb);
1836         fb_dealloc_cmap(&info->cmap);
1837 out:
1838         if (par->vbe_modes)
1839                 kfree(par->vbe_modes);
1840
1841         framebuffer_release(info);
1842         return err;
1843 }
1844
1845 static int uvesafb_remove(struct platform_device *dev)
1846 {
1847         struct fb_info *info = platform_get_drvdata(dev);
1848
1849         if (info) {
1850                 struct uvesafb_par *par = info->par;
1851
1852                 sysfs_remove_group(&dev->dev.kobj, &uvesafb_dev_attgrp);
1853                 unregister_framebuffer(info);
1854                 release_region(0x3c0, 32);
1855                 iounmap(info->screen_base);
1856                 release_mem_region(info->fix.smem_start, info->fix.smem_len);
1857                 fb_destroy_modedb(info->monspecs.modedb);
1858                 fb_dealloc_cmap(&info->cmap);
1859
1860                 if (par) {
1861                         if (par->vbe_modes)
1862                                 kfree(par->vbe_modes);
1863                         if (par->vbe_state_orig)
1864                                 kfree(par->vbe_state_orig);
1865                         if (par->vbe_state_saved)
1866                                 kfree(par->vbe_state_saved);
1867                 }
1868
1869                 framebuffer_release(info);
1870         }
1871         return 0;
1872 }
1873
1874 static struct platform_driver uvesafb_driver = {
1875         .probe  = uvesafb_probe,
1876         .remove = uvesafb_remove,
1877         .driver = {
1878                 .name = "uvesafb",
1879         },
1880 };
1881
1882 static struct platform_device *uvesafb_device;
1883
1884 #ifndef MODULE
1885 static int __devinit uvesafb_setup(char *options)
1886 {
1887         char *this_opt;
1888
1889         if (!options || !*options)
1890                 return 0;
1891
1892         while ((this_opt = strsep(&options, ",")) != NULL) {
1893                 if (!*this_opt) continue;
1894
1895                 if (!strcmp(this_opt, "redraw"))
1896                         ypan = 0;
1897                 else if (!strcmp(this_opt, "ypan"))
1898                         ypan = 1;
1899                 else if (!strcmp(this_opt, "ywrap"))
1900                         ypan = 2;
1901                 else if (!strcmp(this_opt, "vgapal"))
1902                         pmi_setpal = 0;
1903                 else if (!strcmp(this_opt, "pmipal"))
1904                         pmi_setpal = 1;
1905                 else if (!strncmp(this_opt, "mtrr:", 5))
1906                         mtrr = simple_strtoul(this_opt+5, NULL, 0);
1907                 else if (!strcmp(this_opt, "nomtrr"))
1908                         mtrr = 0;
1909                 else if (!strcmp(this_opt, "nocrtc"))
1910                         nocrtc = 1;
1911                 else if (!strcmp(this_opt, "noedid"))
1912                         noedid = 1;
1913                 else if (!strcmp(this_opt, "noblank"))
1914                         blank = 0;
1915                 else if (!strncmp(this_opt, "vtotal:", 7))
1916                         vram_total = simple_strtoul(this_opt + 7, NULL, 0);
1917                 else if (!strncmp(this_opt, "vremap:", 7))
1918                         vram_remap = simple_strtoul(this_opt + 7, NULL, 0);
1919                 else if (!strncmp(this_opt, "maxhf:", 6))
1920                         maxhf = simple_strtoul(this_opt + 6, NULL, 0);
1921                 else if (!strncmp(this_opt, "maxvf:", 6))
1922                         maxvf = simple_strtoul(this_opt + 6, NULL, 0);
1923                 else if (!strncmp(this_opt, "maxclk:", 7))
1924                         maxclk = simple_strtoul(this_opt + 7, NULL, 0);
1925                 else if (!strncmp(this_opt, "vbemode:", 8))
1926                         vbemode = simple_strtoul(this_opt + 8, NULL, 0);
1927                 else if (this_opt[0] >= '0' && this_opt[0] <= '9') {
1928                         mode_option = this_opt;
1929                 } else {
1930                         printk(KERN_WARNING
1931                                 "uvesafb: unrecognized option %s\n", this_opt);
1932                 }
1933         }
1934
1935         return 0;
1936 }
1937 #endif /* !MODULE */
1938
1939 static ssize_t show_v86d(struct device_driver *dev, char *buf)
1940 {
1941         return snprintf(buf, PAGE_SIZE, "%s\n", v86d_path);
1942 }
1943
1944 static ssize_t store_v86d(struct device_driver *dev, const char *buf,
1945                 size_t count)
1946 {
1947         strncpy(v86d_path, buf, PATH_MAX);
1948         return count;
1949 }
1950
1951 static DRIVER_ATTR(v86d, S_IRUGO | S_IWUSR, show_v86d, store_v86d);
1952
1953 static int __devinit uvesafb_init(void)
1954 {
1955         int err;
1956
1957 #ifndef MODULE
1958         char *option = NULL;
1959
1960         if (fb_get_options("uvesafb", &option))
1961                 return -ENODEV;
1962         uvesafb_setup(option);
1963 #endif
1964         err = cn_add_callback(&uvesafb_cn_id, "uvesafb", uvesafb_cn_callback);
1965         if (err)
1966                 return err;
1967
1968         err = platform_driver_register(&uvesafb_driver);
1969
1970         if (!err) {
1971                 uvesafb_device = platform_device_alloc("uvesafb", 0);
1972                 if (uvesafb_device)
1973                         err = platform_device_add(uvesafb_device);
1974                 else
1975                         err = -ENOMEM;
1976
1977                 if (err) {
1978                         platform_device_put(uvesafb_device);
1979                         platform_driver_unregister(&uvesafb_driver);
1980                         cn_del_callback(&uvesafb_cn_id);
1981                         return err;
1982                 }
1983
1984                 err = driver_create_file(&uvesafb_driver.driver,
1985                                 &driver_attr_v86d);
1986                 if (err) {
1987                         printk(KERN_WARNING "uvesafb: failed to register "
1988                                         "attributes\n");
1989                         err = 0;
1990                 }
1991         }
1992         return err;
1993 }
1994
1995 module_init(uvesafb_init);
1996
1997 static void __devexit uvesafb_exit(void)
1998 {
1999         struct uvesafb_ktask *task;
2000
2001         if (v86d_started) {
2002                 task = uvesafb_prep();
2003                 if (task) {
2004                         task->t.flags = TF_EXIT;
2005                         uvesafb_exec(task);
2006                         uvesafb_free(task);
2007                 }
2008         }
2009
2010         cn_del_callback(&uvesafb_cn_id);
2011         driver_remove_file(&uvesafb_driver.driver, &driver_attr_v86d);
2012         platform_device_unregister(uvesafb_device);
2013         platform_driver_unregister(&uvesafb_driver);
2014 }
2015
2016 module_exit(uvesafb_exit);
2017
2018 static int param_set_scroll(const char *val, const struct kernel_param *kp)
2019 {
2020         ypan = 0;
2021
2022         if (!strcmp(val, "redraw"))
2023                 ypan = 0;
2024         else if (!strcmp(val, "ypan"))
2025                 ypan = 1;
2026         else if (!strcmp(val, "ywrap"))
2027                 ypan = 2;
2028         else
2029                 return -EINVAL;
2030
2031         return 0;
2032 }
2033 static struct kernel_param_ops param_ops_scroll = {
2034         .set = param_set_scroll,
2035 };
2036 #define param_check_scroll(name, p) __param_check(name, p, void)
2037
2038 module_param_named(scroll, ypan, scroll, 0);
2039 MODULE_PARM_DESC(scroll,
2040         "Scrolling mode, set to 'redraw', 'ypan', or 'ywrap'");
2041 module_param_named(vgapal, pmi_setpal, invbool, 0);
2042 MODULE_PARM_DESC(vgapal, "Set palette using VGA registers");
2043 module_param_named(pmipal, pmi_setpal, bool, 0);
2044 MODULE_PARM_DESC(pmipal, "Set palette using PMI calls");
2045 module_param(mtrr, uint, 0);
2046 MODULE_PARM_DESC(mtrr,
2047         "Memory Type Range Registers setting. Use 0 to disable.");
2048 module_param(blank, bool, 0);
2049 MODULE_PARM_DESC(blank, "Enable hardware blanking");
2050 module_param(nocrtc, bool, 0);
2051 MODULE_PARM_DESC(nocrtc, "Ignore CRTC timings when setting modes");
2052 module_param(noedid, bool, 0);
2053 MODULE_PARM_DESC(noedid,
2054         "Ignore EDID-provided monitor limits when setting modes");
2055 module_param(vram_remap, uint, 0);
2056 MODULE_PARM_DESC(vram_remap, "Set amount of video memory to be used [MiB]");
2057 module_param(vram_total, uint, 0);
2058 MODULE_PARM_DESC(vram_total, "Set total amount of video memoery [MiB]");
2059 module_param(maxclk, ushort, 0);
2060 MODULE_PARM_DESC(maxclk, "Maximum pixelclock [MHz], overrides EDID data");
2061 module_param(maxhf, ushort, 0);
2062 MODULE_PARM_DESC(maxhf,
2063         "Maximum horizontal frequency [kHz], overrides EDID data");
2064 module_param(maxvf, ushort, 0);
2065 MODULE_PARM_DESC(maxvf,
2066         "Maximum vertical frequency [Hz], overrides EDID data");
2067 module_param(mode_option, charp, 0);
2068 MODULE_PARM_DESC(mode_option,
2069         "Specify initial video mode as \"<xres>x<yres>[-<bpp>][@<refresh>]\"");
2070 module_param(vbemode, ushort, 0);
2071 MODULE_PARM_DESC(vbemode,
2072         "VBE mode number to set, overrides the 'mode' option");
2073 module_param_string(v86d, v86d_path, PATH_MAX, 0660);
2074 MODULE_PARM_DESC(v86d, "Path to the v86d userspace helper.");
2075
2076 MODULE_LICENSE("GPL");
2077 MODULE_AUTHOR("Michal Januszewski <spock@gentoo.org>");
2078 MODULE_DESCRIPTION("Framebuffer driver for VBE2.0+ compliant graphics boards");
2079