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