drivers/video/fbdev/uvesafb.c

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