drivers/video/uvesafb.c

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