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