drivers/video/uvesafb.c

   1 /*
   2  * A framebuffer driver for VBE 2.0+ compliant video cards
   3  *
   4  * (c) 2007 Michal Januszewski <spock@gentoo.org>
   5  *     Loosely based upon the vesafb driver.
   6  *
   7  */
   8 #include <linux/init.h>
   9 #include <linux/module.h>
  10 #include <linux/moduleparam.h>
  11 #include <linux/skbuff.h>
  12 #include <linux/timer.h>
  13 #include <linux/completion.h>
  14 #include <linux/connector.h>
  15 #include <linux/random.h>
  16 #include <linux/platform_device.h>
  17 #include <linux/limits.h>
  18 #include <linux/fb.h>
  19 #include <linux/io.h>
  20 #include <linux/mutex.h>
  21 #include <linux/slab.h>
  22 #include <video/edid.h>
  23 #include <video/uvesafb.h>
  24 #ifdef CONFIG_X86
  25 #include <video/vga.h>
  26 #endif
  27 #ifdef CONFIG_MTRR
  28 #include <asm/mtrr.h>
  29 #endif
  30 #include "edid.h"
  31
  32 static struct cb_id uvesafb_cn_id = {
  33         .idx = CN_IDX_V86D,
  34         .val = CN_VAL_V86D_UVESAFB
  35 };
  36 static char v86d_path[PATH_MAX] = "/sbin/v86d";
  37 static char v86d_started;       /* has v86d been started by uvesafb? */
  38
  39 static struct fb_fix_screeninfo uvesafb_fix = {
  40         .id     = "VESA VGA",
  41         .type   = FB_TYPE_PACKED_PIXELS,
  42         .accel  = FB_ACCEL_NONE,
  43         .visual = FB_VISUAL_TRUECOLOR,
  44 };
  45
  46 static int mtrr         = 3;    /* enable mtrr by default */
  47 static bool blank       = 1;    /* enable blanking by default */
  48 static int ypan         = 1;    /* 0: scroll, 1: ypan, 2: ywrap */
  49 static bool pmi_setpal  = true; /* use PMI for palette changes */
  50 static bool nocrtc;             /* ignore CRTC settings */
  51 static bool noedid;             /* don't try DDC transfers */
  52 static int vram_remap;          /* set amt. of memory to be used */
  53 static int vram_total;          /* set total amount of memory */
  54 static u16 maxclk;              /* maximum pixel clock */
  55 static u16 maxvf;               /* maximum vertical frequency */
  56 static u16 maxhf;               /* maximum horizontal frequency */
  57 static u16 vbemode;             /* force use of a specific VBE mode */
  58 static char *mode_option;
  59 static u8  dac_width    = 6;
  60
  61 static struct uvesafb_ktask *uvfb_tasks[UVESAFB_TASKS_MAX];
  62 static DEFINE_MUTEX(uvfb_lock);
  63
  64 /*
  65  * A handler for replies from userspace.
  66  *
  67  * Make sure each message passes consistency checks and if it does,
  68  * find the kernel part of the task struct, copy the registers and
  69  * the buffer contents and then complete the task.
  70  */
  71 static void uvesafb_cn_callback(struct cn_msg *msg, struct netlink_skb_parms *nsp)
  72 {
  73         struct uvesafb_task *utask;
  74         struct uvesafb_ktask *task;
  75
  76         if (!capable(CAP_SYS_ADMIN))
  77                 return;
  78
  79         if (msg->seq >= UVESAFB_TASKS_MAX)
  80                 return;
  81
  82         mutex_lock(&uvfb_lock);
  83         task = uvfb_tasks[msg->seq];
  84
  85         if (!task || msg->ack != task->ack) {
  86                 mutex_unlock(&uvfb_lock);
  87                 return;
  88         }
  89
  90         utask = (struct uvesafb_task *)msg->data;
  91
  92         /* Sanity checks for the buffer length. */
  93         if (task->t.buf_len < utask->buf_len ||
  94             utask->buf_len > msg->len - sizeof(*utask)) {
  95                 mutex_unlock(&uvfb_lock);
  96                 return;
  97         }
  98
  99         uvfb_tasks[msg->seq] = NULL;
 100         mutex_unlock(&uvfb_lock);
 101
 102         memcpy(&task->t, utask, sizeof(*utask));
 103
 104         if (task->t.buf_len && task->buf)
 105                 memcpy(task->buf, utask + 1, task->t.buf_len);
 106
 107         complete(task->done);
 108         return;
 109 }
 110
 111 static int uvesafb_helper_start(void)
 112 {
 113         char *envp[] = {
 114                 "HOME=/",
 115                 "PATH=/sbin:/bin",
 116                 NULL,
 117         };
 118
 119         char *argv[] = {
 120                 v86d_path,
 121                 NULL,
 122         };
 123
 124         return call_usermodehelper(v86d_path, argv, envp, UMH_WAIT_PROC);
 125 }
 126
 127 /*
 128  * Execute a uvesafb task.
 129  *
 130  * Returns 0 if the task is executed successfully.
 131  *
 132  * A message sent to the userspace consists of the uvesafb_task
 133  * struct and (optionally) a buffer. The uvesafb_task struct is
 134  * a simplified version of uvesafb_ktask (its kernel counterpart)
 135  * containing only the register values, flags and the length of
 136  * the buffer.
 137  *
 138  * Each message is assigned a sequence number (increased linearly)
 139  * and a random ack number. The sequence number is used as a key
 140  * for the uvfb_tasks array which holds pointers to uvesafb_ktask
 141  * structs for all requests.
 142  */
 143 static int uvesafb_exec(struct uvesafb_ktask *task)
 144 {
 145         static int seq;
 146         struct cn_msg *m;
 147         int err;
 148         int len = sizeof(task->t) + task->t.buf_len;
 149
 150         /*
 151          * Check whether the message isn't longer than the maximum
 152          * allowed by connector.
 153          */
 154         if (sizeof(*m) + len > CONNECTOR_MAX_MSG_SIZE) {
 155                 printk(KERN_WARNING "uvesafb: message too long (%d), "
 156                         "can't execute task\n", (int)(sizeof(*m) + len));
 157                 return -E2BIG;
 158         }
 159
 160         m = kzalloc(sizeof(*m) + len, GFP_KERNEL);
 161         if (!m)
 162                 return -ENOMEM;
 163
 164         init_completion(task->done);
 165
 166         memcpy(&m->id, &uvesafb_cn_id, sizeof(m->id));
 167         m->seq = seq;
 168         m->len = len;
 169         m->ack = random32();
 170
 171         /* uvesafb_task structure */
 172         memcpy(m + 1, &task->t, sizeof(task->t));
 173
 174         /* Buffer */
 175         memcpy((u8 *)(m + 1) + sizeof(task->t), task->buf, task->t.buf_len);
 176
 177         /*
 178          * Save the message ack number so that we can find the kernel
 179          * part of this task when a reply is received from userspace.
 180          */
 181         task->ack = m->ack;
 182
 183         mutex_lock(&uvfb_lock);
 184
 185         /* If all slots are taken -- bail out. */
 186         if (uvfb_tasks[seq]) {
 187                 mutex_unlock(&uvfb_lock);
 188                 err = -EBUSY;
 189                 goto out;
 190         }
 191
 192         /* Save a pointer to the kernel part of the task struct. */
 193         uvfb_tasks[seq] = task;
 194         mutex_unlock(&uvfb_lock);
 195
 196         err = cn_netlink_send(m, 0, GFP_KERNEL);
 197         if (err == -ESRCH) {
 198                 /*
 199                  * Try to start the userspace helper if sending
 200                  * the request failed the first time.
 201                  */
 202                 err = uvesafb_helper_start();
 203                 if (err) {
 204                         printk(KERN_ERR "uvesafb: failed to execute %s\n",
 205                                         v86d_path);
 206                         printk(KERN_ERR "uvesafb: make sure that the v86d "
 207                                         "helper is installed and executable\n");
 208                 } else {
 209                         v86d_started = 1;
 210                         err = cn_netlink_send(m, 0, gfp_any());
 211                         if (err == -ENOBUFS)
 212                                 err = 0;
 213                 }
 214         } else if (err == -ENOBUFS)
 215                 err = 0;
 216
 217         if (!err && !(task->t.flags & TF_EXIT))
 218                 err = !wait_for_completion_timeout(task->done,
 219                                 msecs_to_jiffies(UVESAFB_TIMEOUT));
 220
 221         mutex_lock(&uvfb_lock);
 222         uvfb_tasks[seq] = NULL;
 223         mutex_unlock(&uvfb_lock);
 224
 225         seq++;
 226         if (seq >= UVESAFB_TASKS_MAX)
 227                 seq = 0;
 228 out:
 229         kfree(m);
 230         return err;
 231 }
 232
 233 /*
 234  * Free a uvesafb_ktask struct.
 235  */
 236 static void uvesafb_free(struct uvesafb_ktask *task)
 237 {
 238         if (task) {
 239                 if (task->done)
 240                         kfree(task->done);
 241                 kfree(task);
 242         }
 243 }
 244
 245 /*
 246  * Prepare a uvesafb_ktask struct to be used again.
 247  */
 248 static void uvesafb_reset(struct uvesafb_ktask *task)
 249 {
 250         struct completion *cpl = task->done;
 251
 252         memset(task, 0, sizeof(*task));
 253         task->done = cpl;
 254 }
 255
 256 /*
 257  * Allocate and prepare a uvesafb_ktask struct.
 258  */
 259 static struct uvesafb_ktask *uvesafb_prep(void)
 260 {
 261         struct uvesafb_ktask *task;
 262
 263         task = kzalloc(sizeof(*task), GFP_KERNEL);
 264         if (task) {
 265                 task->done = kzalloc(sizeof(*task->done), GFP_KERNEL);
 266                 if (!task->done) {
 267                         kfree(task);
 268                         task = NULL;
 269                 }
 270         }
 271         return task;
 272 }
 273
 274 static void uvesafb_setup_var(struct fb_var_screeninfo *var,
 275                 struct fb_info *info, struct vbe_mode_ib *mode)
 276 {
 277         struct uvesafb_par *par = info->par;
 278
 279         var->vmode = FB_VMODE_NONINTERLACED;
 280         var->sync = FB_SYNC_VERT_HIGH_ACT;
 281
 282         var->xres = mode->x_res;
 283         var->yres = mode->y_res;
 284         var->xres_virtual = mode->x_res;
 285         var->yres_virtual = (par->ypan) ?
 286                         info->fix.smem_len / mode->bytes_per_scan_line :
 287                         mode->y_res;
 288         var->xoffset = 0;
 289         var->yoffset = 0;
 290         var->bits_per_pixel = mode->bits_per_pixel;
 291
 292         if (var->bits_per_pixel == 15)
 293                 var->bits_per_pixel = 16;
 294
 295         if (var->bits_per_pixel > 8) {
 296                 var->red.offset    = mode->red_off;
 297                 var->red.length    = mode->red_len;
 298                 var->green.offset  = mode->green_off;
 299                 var->green.length  = mode->green_len;
 300                 var->blue.offset   = mode->blue_off;
 301                 var->blue.length   = mode->blue_len;
 302                 var->transp.offset = mode->rsvd_off;
 303                 var->transp.length = mode->rsvd_len;
 304         } else {
 305                 var->red.offset    = 0;
 306                 var->green.offset  = 0;
 307                 var->blue.offset   = 0;
 308                 var->transp.offset = 0;
 309
 310                 var->red.length    = 8;
 311                 var->green.length  = 8;
 312                 var->blue.length   = 8;
 313                 var->transp.length = 0;
 314         }
 315 }
 316
 317 static int uvesafb_vbe_find_mode(struct uvesafb_par *par,
 318                 int xres, int yres, int depth, unsigned char flags)
 319 {
 320         int i, match = -1, h = 0, d = 0x7fffffff;
 321
 322         for (i = 0; i < par->vbe_modes_cnt; i++) {
 323                 h = abs(par->vbe_modes[i].x_res - xres) +
 324                     abs(par->vbe_modes[i].y_res - yres) +
 325                     abs(depth - par->vbe_modes[i].depth);
 326
 327                 /*
 328                  * We have an exact match in terms of resolution
 329                  * and depth.
 330                  */
 331                 if (h == 0)
 332                         return i;
 333
 334                 if (h < d || (h == d && par->vbe_modes[i].depth > depth)) {
 335                         d = h;
 336                         match = i;
 337                 }
 338         }
 339         i = 1;
 340
 341         if (flags & UVESAFB_EXACT_DEPTH &&
 342                         par->vbe_modes[match].depth != depth)
 343                 i = 0;
 344
 345         if (flags & UVESAFB_EXACT_RES && d > 24)
 346                 i = 0;
 347
 348         if (i != 0)
 349                 return match;
 350         else
 351                 return -1;
 352 }
 353
 354 static u8 *uvesafb_vbe_state_save(struct uvesafb_par *par)
 355 {
 356         struct uvesafb_ktask *task;
 357         u8 *state;
 358         int err;
 359
 360         if (!par->vbe_state_size)
 361                 return NULL;
 362
 363         state = kmalloc(par->vbe_state_size, GFP_KERNEL);
 364         if (!state)
 365                 return ERR_PTR(-ENOMEM);
 366
 367         task = uvesafb_prep();
 368         if (!task) {
 369                 kfree(state);
 370                 return NULL;
 371         }
 372
 373         task->t.regs.eax = 0x4f04;
 374         task->t.regs.ecx = 0x000f;
 375         task->t.regs.edx = 0x0001;
 376         task->t.flags = TF_BUF_RET | TF_BUF_ESBX;
 377         task->t.buf_len = par->vbe_state_size;
 378         task->buf = state;
 379         err = uvesafb_exec(task);
 380
 381         if (err || (task->t.regs.eax & 0xffff) != 0x004f) {
 382                 printk(KERN_WARNING "uvesafb: VBE get state call "
 383                                 "failed (eax=0x%x, err=%d)\n",
 384                                 task->t.regs.eax, err);
 385                 kfree(state);
 386                 state = NULL;
 387         }
 388
 389         uvesafb_free(task);
 390         return state;
 391 }
 392
 393 static void uvesafb_vbe_state_restore(struct uvesafb_par *par, u8 *state_buf)
 394 {
 395         struct uvesafb_ktask *task;
 396         int err;
 397
 398         if (!state_buf)
 399                 return;
 400
 401         task = uvesafb_prep();
 402         if (!task)
 403                 return;
 404
 405         task->t.regs.eax = 0x4f04;
 406         task->t.regs.ecx = 0x000f;
 407         task->t.regs.edx = 0x0002;
 408         task->t.buf_len = par->vbe_state_size;
 409         task->t.flags = TF_BUF_ESBX;
 410         task->buf = state_buf;
 411
 412         err = uvesafb_exec(task);
 413         if (err || (task->t.regs.eax & 0xffff) != 0x004f)
 414                 printk(KERN_WARNING "uvesafb: VBE state restore call "
 415                                 "failed (eax=0x%x, err=%d)\n",
 416                                 task->t.regs.eax, err);
 417
 418         uvesafb_free(task);
 419 }
 420
 421 static int uvesafb_vbe_getinfo(struct uvesafb_ktask *task,
 422                                struct uvesafb_par *par)
 423 {
 424         int err;
 425
 426         task->t.regs.eax = 0x4f00;
 427         task->t.flags = TF_VBEIB;
 428         task->t.buf_len = sizeof(struct vbe_ib);
 429         task->buf = &par->vbe_ib;
 430         strncpy(par->vbe_ib.vbe_signature, "VBE2", 4);
 431
 432         err = uvesafb_exec(task);
 433         if (err || (task->t.regs.eax & 0xffff) != 0x004f) {
 434                 printk(KERN_ERR "uvesafb: Getting VBE info block failed "
 435                                 "(eax=0x%x, err=%d)\n", (u32)task->t.regs.eax,
 436                                 err);
 437                 return -EINVAL;
 438         }
 439
 440         if (par->vbe_ib.vbe_version < 0x0200) {
 441                 printk(KERN_ERR "uvesafb: Sorry, pre-VBE 2.0 cards are "
 442                                 "not supported.\n");
 443                 return -EINVAL;
 444         }
 445
 446         if (!par->vbe_ib.mode_list_ptr) {
 447                 printk(KERN_ERR "uvesafb: Missing mode list!\n");
 448                 return -EINVAL;
 449         }
 450
 451         printk(KERN_INFO "uvesafb: ");
 452
 453         /*
 454          * Convert string pointers and the mode list pointer into
 455          * usable addresses. Print informational messages about the
 456          * video adapter and its vendor.
 457          */
 458         if (par->vbe_ib.oem_vendor_name_ptr)
 459                 printk("%s, ",
 460                         ((char *)task->buf) + par->vbe_ib.oem_vendor_name_ptr);
 461
 462         if (par->vbe_ib.oem_product_name_ptr)
 463                 printk("%s, ",
 464                         ((char *)task->buf) + par->vbe_ib.oem_product_name_ptr);
 465
 466         if (par->vbe_ib.oem_product_rev_ptr)
 467                 printk("%s, ",
 468                         ((char *)task->buf) + par->vbe_ib.oem_product_rev_ptr);
 469
 470         if (par->vbe_ib.oem_string_ptr)
 471                 printk("OEM: %s, ",
 472                         ((char *)task->buf) + par->vbe_ib.oem_string_ptr);
 473
 474         printk("VBE v%d.%d\n", ((par->vbe_ib.vbe_version & 0xff00) >> 8),
 475                         par->vbe_ib.vbe_version & 0xff);
 476
 477         return 0;
 478 }
 479
 480 static int uvesafb_vbe_getmodes(struct uvesafb_ktask *task,
 481                                 struct uvesafb_par *par)
 482 {
 483         int off = 0, err;
 484         u16 *mode;
 485
 486         par->vbe_modes_cnt = 0;
 487
 488         /* Count available modes. */
 489         mode = (u16 *) (((u8 *)&par->vbe_ib) + par->vbe_ib.mode_list_ptr);
 490         while (*mode != 0xffff) {
 491                 par->vbe_modes_cnt++;
 492                 mode++;
 493         }
 494
 495         par->vbe_modes = kzalloc(sizeof(struct vbe_mode_ib) *
 496                                 par->vbe_modes_cnt, GFP_KERNEL);
 497         if (!par->vbe_modes)
 498                 return -ENOMEM;
 499
 500         /* Get info about all available modes. */
 501         mode = (u16 *) (((u8 *)&par->vbe_ib) + par->vbe_ib.mode_list_ptr);
 502         while (*mode != 0xffff) {
 503                 struct vbe_mode_ib *mib;
 504
 505                 uvesafb_reset(task);
 506                 task->t.regs.eax = 0x4f01;
 507                 task->t.regs.ecx = (u32) *mode;
 508                 task->t.flags = TF_BUF_RET | TF_BUF_ESDI;
 509                 task->t.buf_len = sizeof(struct vbe_mode_ib);
 510                 task->buf = par->vbe_modes + off;
 511
 512                 err = uvesafb_exec(task);
 513                 if (err || (task->t.regs.eax & 0xffff) != 0x004f) {
 514                         printk(KERN_WARNING "uvesafb: Getting mode info block "
 515                                 "for mode 0x%x failed (eax=0x%x, err=%d)\n",
 516                                 *mode, (u32)task->t.regs.eax, err);
 517                         mode++;
 518                         par->vbe_modes_cnt--;
 519                         continue;
 520                 }
 521
 522                 mib = task->buf;
 523                 mib->mode_id = *mode;
 524
 525                 /*
 526                  * We only want modes that are supported with the current
 527                  * hardware configuration, color, graphics and that have
 528                  * support for the LFB.
 529                  */
 530                 if ((mib->mode_attr & VBE_MODE_MASK) == VBE_MODE_MASK &&
 531                                  mib->bits_per_pixel >= 8)
 532                         off++;
 533                 else
 534                         par->vbe_modes_cnt--;
 535
 536                 mode++;
 537                 mib->depth = mib->red_len + mib->green_len + mib->blue_len;
 538
 539                 /*
 540                  * Handle 8bpp modes and modes with broken color component
 541                  * lengths.
 542                  */
 543                 if (mib->depth == 0 || (mib->depth == 24 &&
 544                                         mib->bits_per_pixel == 32))
 545                         mib->depth = mib->bits_per_pixel;
 546         }
 547
 548         if (par->vbe_modes_cnt > 0)
 549                 return 0;
 550         else
 551                 return -EINVAL;
 552 }
 553
 554 /*
 555  * The Protected Mode Interface is 32-bit x86 code, so we only run it on
 556  * x86 and not x86_64.
 557  */
 558 #ifdef CONFIG_X86_32
 559 static int uvesafb_vbe_getpmi(struct uvesafb_ktask *task,
 560                               struct uvesafb_par *par)
 561 {
 562         int i, err;
 563
 564         uvesafb_reset(task);
 565         task->t.regs.eax = 0x4f0a;
 566         task->t.regs.ebx = 0x0;
 567         err = uvesafb_exec(task);
 568
 569         if ((task->t.regs.eax & 0xffff) != 0x4f || task->t.regs.es < 0xc000) {
 570                 par->pmi_setpal = par->ypan = 0;
 571         } else {
 572                 par->pmi_base = (u16 *)phys_to_virt(((u32)task->t.regs.es << 4)
 573                                                 + task->t.regs.edi);
 574                 par->pmi_start = (u8 *)par->pmi_base + par->pmi_base[1];
 575                 par->pmi_pal = (u8 *)par->pmi_base + par->pmi_base[2];
 576                 printk(KERN_INFO "uvesafb: protected mode interface info at "
 577                                  "%04x:%04x\n",
 578                                  (u16)task->t.regs.es, (u16)task->t.regs.edi);
 579                 printk(KERN_INFO "uvesafb: pmi: set display start = %p, "
 580                                  "set palette = %p\n", par->pmi_start,
 581                                  par->pmi_pal);
 582
 583                 if (par->pmi_base[3]) {
 584                         printk(KERN_INFO "uvesafb: pmi: ports = ");
 585                         for (i = par->pmi_base[3]/2;
 586                                         par->pmi_base[i] != 0xffff; i++)
 587                                 printk("%x ", par->pmi_base[i]);
 588                         printk("\n");
 589
 590                         if (par->pmi_base[i] != 0xffff) {
 591                                 printk(KERN_INFO "uvesafb: can't handle memory"
 592                                                  " requests, pmi disabled\n");
 593                                 par->ypan = par->pmi_setpal = 0;
 594                         }
 595                 }
 596         }
 597         return 0;
 598 }
 599 #endif /* CONFIG_X86_32 */
 600
 601 /*
 602  * Check whether a video mode is supported by the Video BIOS and is
 603  * compatible with the monitor limits.
 604  */
 605 static int uvesafb_is_valid_mode(struct fb_videomode *mode,
 606                                  struct fb_info *info)
 607 {
 608         if (info->monspecs.gtf) {
 609                 fb_videomode_to_var(&info->var, mode);
 610                 if (fb_validate_mode(&info->var, info))
 611                         return 0;
 612         }
 613
 614         if (uvesafb_vbe_find_mode(info->par, mode->xres, mode->yres, 8,
 615                                 UVESAFB_EXACT_RES) == -1)
 616                 return 0;
 617
 618         return 1;
 619 }
 620
 621 static int uvesafb_vbe_getedid(struct uvesafb_ktask *task, struct fb_info *info)
 622 {
 623         struct uvesafb_par *par = info->par;
 624         int err = 0;
 625
 626         if (noedid || par->vbe_ib.vbe_version < 0x0300)
 627                 return -EINVAL;
 628
 629         task->t.regs.eax = 0x4f15;
 630         task->t.regs.ebx = 0;
 631         task->t.regs.ecx = 0;
 632         task->t.buf_len = 0;
 633         task->t.flags = 0;
 634
 635         err = uvesafb_exec(task);
 636
 637         if ((task->t.regs.eax & 0xffff) != 0x004f || err)
 638                 return -EINVAL;
 639
 640         if ((task->t.regs.ebx & 0x3) == 3) {
 641                 printk(KERN_INFO "uvesafb: VBIOS/hardware supports both "
 642                                  "DDC1 and DDC2 transfers\n");
 643         } else if ((task->t.regs.ebx & 0x3) == 2) {
 644                 printk(KERN_INFO "uvesafb: VBIOS/hardware supports DDC2 "
 645                                  "transfers\n");
 646         } else if ((task->t.regs.ebx & 0x3) == 1) {
 647                 printk(KERN_INFO "uvesafb: VBIOS/hardware supports DDC1 "
 648                                  "transfers\n");
 649         } else {
 650                 printk(KERN_INFO "uvesafb: VBIOS/hardware doesn't support "
 651                                  "DDC transfers\n");
 652                 return -EINVAL;
 653         }
 654
 655         task->t.regs.eax = 0x4f15;
 656         task->t.regs.ebx = 1;
 657         task->t.regs.ecx = task->t.regs.edx = 0;
 658         task->t.flags = TF_BUF_RET | TF_BUF_ESDI;
 659         task->t.buf_len = EDID_LENGTH;
 660         task->buf = kzalloc(EDID_LENGTH, GFP_KERNEL);
 661         if (!task->buf)
 662                 return -ENOMEM;
 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 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 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 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 (__supported_pte_mask & _PAGE_NX) {
 821                         par->pmi_setpal = par->ypan = 0;
 822                         printk(KERN_WARNING "uvesafb: NX protection is actively."
 823                                 "We have better not to use the PMI.\n");
 824                 } else {
 825                         uvesafb_vbe_getpmi(task, par);
 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 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         u8 *buf = NULL;
1184
1185         if (!cnt && par->vbe_state_size) {
1186                 buf =  uvesafb_vbe_state_save(par);
1187                 if (IS_ERR(buf)) {
1188                         printk(KERN_WARNING "uvesafb: save hardware state"
1189                                 "failed, error code is %ld!\n", PTR_ERR(buf));
1190                 } else {
1191                         par->vbe_state_orig = buf;
1192                 }
1193         }
1194
1195         atomic_inc(&par->ref_count);
1196         return 0;
1197 }
1198
1199 static int uvesafb_release(struct fb_info *info, int user)
1200 {
1201         struct uvesafb_ktask *task = NULL;
1202         struct uvesafb_par *par = info->par;
1203         int cnt = atomic_read(&par->ref_count);
1204
1205         if (!cnt)
1206                 return -EINVAL;
1207
1208         if (cnt != 1)
1209                 goto out;
1210
1211         task = uvesafb_prep();
1212         if (!task)
1213                 goto out;
1214
1215         /* First, try to set the standard 80x25 text mode. */
1216         task->t.regs.eax = 0x0003;
1217         uvesafb_exec(task);
1218
1219         /*
1220          * Now try to restore whatever hardware state we might have
1221          * saved when the fb device was first opened.
1222          */
1223         uvesafb_vbe_state_restore(par, par->vbe_state_orig);
1224 out:
1225         atomic_dec(&par->ref_count);
1226         if (task)
1227                 uvesafb_free(task);
1228         return 0;
1229 }
1230
1231 static int uvesafb_set_par(struct fb_info *info)
1232 {
1233         struct uvesafb_par *par = info->par;
1234         struct uvesafb_ktask *task = NULL;
1235         struct vbe_crtc_ib *crtc = NULL;
1236         struct vbe_mode_ib *mode = NULL;
1237         int i, err = 0, depth = info->var.bits_per_pixel;
1238
1239         if (depth > 8 && depth != 32)
1240                 depth = info->var.red.length + info->var.green.length +
1241                         info->var.blue.length;
1242
1243         i = uvesafb_vbe_find_mode(par, info->var.xres, info->var.yres, depth,
1244                                  UVESAFB_EXACT_RES | UVESAFB_EXACT_DEPTH);
1245         if (i >= 0)
1246                 mode = &par->vbe_modes[i];
1247         else
1248                 return -EINVAL;
1249
1250         task = uvesafb_prep();
1251         if (!task)
1252                 return -ENOMEM;
1253 setmode:
1254         task->t.regs.eax = 0x4f02;
1255         task->t.regs.ebx = mode->mode_id | 0x4000;      /* use LFB */
1256
1257         if (par->vbe_ib.vbe_version >= 0x0300 && !par->nocrtc &&
1258             info->var.pixclock != 0) {
1259                 task->t.regs.ebx |= 0x0800;             /* use CRTC data */
1260                 task->t.flags = TF_BUF_ESDI;
1261                 crtc = kzalloc(sizeof(struct vbe_crtc_ib), GFP_KERNEL);
1262                 if (!crtc) {
1263                         err = -ENOMEM;
1264                         goto out;
1265                 }
1266                 crtc->horiz_start = info->var.xres + info->var.right_margin;
1267                 crtc->horiz_end   = crtc->horiz_start + info->var.hsync_len;
1268                 crtc->horiz_total = crtc->horiz_end + info->var.left_margin;
1269
1270                 crtc->vert_start  = info->var.yres + info->var.lower_margin;
1271                 crtc->vert_end    = crtc->vert_start + info->var.vsync_len;
1272                 crtc->vert_total  = crtc->vert_end + info->var.upper_margin;
1273
1274                 crtc->pixel_clock = PICOS2KHZ(info->var.pixclock) * 1000;
1275                 crtc->refresh_rate = (u16)(100 * (crtc->pixel_clock /
1276                                 (crtc->vert_total * crtc->horiz_total)));
1277
1278                 if (info->var.vmode & FB_VMODE_DOUBLE)
1279                         crtc->flags |= 0x1;
1280                 if (info->var.vmode & FB_VMODE_INTERLACED)
1281                         crtc->flags |= 0x2;
1282                 if (!(info->var.sync & FB_SYNC_HOR_HIGH_ACT))
1283                         crtc->flags |= 0x4;
1284                 if (!(info->var.sync & FB_SYNC_VERT_HIGH_ACT))
1285                         crtc->flags |= 0x8;
1286                 memcpy(&par->crtc, crtc, sizeof(*crtc));
1287         } else {
1288                 memset(&par->crtc, 0, sizeof(*crtc));
1289         }
1290
1291         task->t.buf_len = sizeof(struct vbe_crtc_ib);
1292         task->buf = &par->crtc;
1293
1294         err = uvesafb_exec(task);
1295         if (err || (task->t.regs.eax & 0xffff) != 0x004f) {
1296                 /*
1297                  * The mode switch might have failed because we tried to
1298                  * use our own timings.  Try again with the default timings.
1299                  */
1300                 if (crtc != NULL) {
1301                         printk(KERN_WARNING "uvesafb: mode switch failed "
1302                                 "(eax=0x%x, err=%d). Trying again with "
1303                                 "default timings.\n", task->t.regs.eax, err);
1304                         uvesafb_reset(task);
1305                         kfree(crtc);
1306                         crtc = NULL;
1307                         info->var.pixclock = 0;
1308                         goto setmode;
1309                 } else {
1310                         printk(KERN_ERR "uvesafb: mode switch failed (eax="
1311                                 "0x%x, err=%d)\n", task->t.regs.eax, err);
1312                         err = -EINVAL;
1313                         goto out;
1314                 }
1315         }
1316         par->mode_idx = i;
1317
1318         /* For 8bpp modes, always try to set the DAC to 8 bits. */
1319         if (par->vbe_ib.capabilities & VBE_CAP_CAN_SWITCH_DAC &&
1320             mode->bits_per_pixel <= 8) {
1321                 uvesafb_reset(task);
1322                 task->t.regs.eax = 0x4f08;
1323                 task->t.regs.ebx = 0x0800;
1324
1325                 err = uvesafb_exec(task);
1326                 if (err || (task->t.regs.eax & 0xffff) != 0x004f ||
1327                     ((task->t.regs.ebx & 0xff00) >> 8) != 8) {
1328                         dac_width = 6;
1329                 } else {
1330                         dac_width = 8;
1331                 }
1332         }
1333
1334         info->fix.visual = (info->var.bits_per_pixel == 8) ?
1335                                 FB_VISUAL_PSEUDOCOLOR : FB_VISUAL_TRUECOLOR;
1336         info->fix.line_length = mode->bytes_per_scan_line;
1337
1338 out:    if (crtc != NULL)
1339                 kfree(crtc);
1340         uvesafb_free(task);
1341
1342         return err;
1343 }
1344
1345 static void uvesafb_check_limits(struct fb_var_screeninfo *var,
1346                 struct fb_info *info)
1347 {
1348         const struct fb_videomode *mode;
1349         struct uvesafb_par *par = info->par;
1350
1351         /*
1352          * If pixclock is set to 0, then we're using default BIOS timings
1353          * and thus don't have to perform any checks here.
1354          */
1355         if (!var->pixclock)
1356                 return;
1357
1358         if (par->vbe_ib.vbe_version < 0x0300) {
1359                 fb_get_mode(FB_VSYNCTIMINGS | FB_IGNOREMON, 60, var, info);
1360                 return;
1361         }
1362
1363         if (!fb_validate_mode(var, info))
1364                 return;
1365
1366         mode = fb_find_best_mode(var, &info->modelist);
1367         if (mode) {
1368                 if (mode->xres == var->xres && mode->yres == var->yres &&
1369                     !(mode->vmode & (FB_VMODE_INTERLACED | FB_VMODE_DOUBLE))) {
1370                         fb_videomode_to_var(var, mode);
1371                         return;
1372                 }
1373         }
1374
1375         if (info->monspecs.gtf && !fb_get_mode(FB_MAXTIMINGS, 0, var, info))
1376                 return;
1377         /* Use default refresh rate */
1378         var->pixclock = 0;
1379 }
1380
1381 static int uvesafb_check_var(struct fb_var_screeninfo *var,
1382                 struct fb_info *info)
1383 {
1384         struct uvesafb_par *par = info->par;
1385         struct vbe_mode_ib *mode = NULL;
1386         int match = -1;
1387         int depth = var->red.length + var->green.length + var->blue.length;
1388
1389         /*
1390          * Various apps will use bits_per_pixel to set the color depth,
1391          * which is theoretically incorrect, but which we'll try to handle
1392          * here.
1393          */
1394         if (depth == 0 || abs(depth - var->bits_per_pixel) >= 8)
1395                 depth = var->bits_per_pixel;
1396
1397         match = uvesafb_vbe_find_mode(par, var->xres, var->yres, depth,
1398                                                 UVESAFB_EXACT_RES);
1399         if (match == -1)
1400                 return -EINVAL;
1401
1402         mode = &par->vbe_modes[match];
1403         uvesafb_setup_var(var, info, mode);
1404
1405         /*
1406          * Check whether we have remapped enough memory for this mode.
1407          * We might be called at an early stage, when we haven't remapped
1408          * any memory yet, in which case we simply skip the check.
1409          */
1410         if (var->yres * mode->bytes_per_scan_line > info->fix.smem_len
1411                                                 && info->fix.smem_len)
1412                 return -EINVAL;
1413
1414         if ((var->vmode & FB_VMODE_DOUBLE) &&
1415                                 !(par->vbe_modes[match].mode_attr & 0x100))
1416                 var->vmode &= ~FB_VMODE_DOUBLE;
1417
1418         if ((var->vmode & FB_VMODE_INTERLACED) &&
1419                                 !(par->vbe_modes[match].mode_attr & 0x200))
1420                 var->vmode &= ~FB_VMODE_INTERLACED;
1421
1422         uvesafb_check_limits(var, info);
1423
1424         var->xres_virtual = var->xres;
1425         var->yres_virtual = (par->ypan) ?
1426                                 info->fix.smem_len / mode->bytes_per_scan_line :
1427                                 var->yres;
1428         return 0;
1429 }
1430
1431 static struct fb_ops uvesafb_ops = {
1432         .owner          = THIS_MODULE,
1433         .fb_open        = uvesafb_open,
1434         .fb_release     = uvesafb_release,
1435         .fb_setcolreg   = uvesafb_setcolreg,
1436         .fb_setcmap     = uvesafb_setcmap,
1437         .fb_pan_display = uvesafb_pan_display,
1438         .fb_blank       = uvesafb_blank,
1439         .fb_fillrect    = cfb_fillrect,
1440         .fb_copyarea    = cfb_copyarea,
1441         .fb_imageblit   = cfb_imageblit,
1442         .fb_check_var   = uvesafb_check_var,
1443         .fb_set_par     = uvesafb_set_par,
1444 };
1445
1446 static void uvesafb_init_info(struct fb_info *info, struct vbe_mode_ib *mode)
1447 {
1448         unsigned int size_vmode;
1449         unsigned int size_remap;
1450         unsigned int size_total;
1451         struct uvesafb_par *par = info->par;
1452         int i, h;
1453
1454         info->pseudo_palette = ((u8 *)info->par + sizeof(struct uvesafb_par));
1455         info->fix = uvesafb_fix;
1456         info->fix.ypanstep = par->ypan ? 1 : 0;
1457         info->fix.ywrapstep = (par->ypan > 1) ? 1 : 0;
1458
1459         /* Disable blanking if the user requested so. */
1460         if (!blank)
1461                 info->fbops->fb_blank = NULL;
1462
1463         /*
1464          * Find out how much IO memory is required for the mode with
1465          * the highest resolution.
1466          */
1467         size_remap = 0;
1468         for (i = 0; i < par->vbe_modes_cnt; i++) {
1469                 h = par->vbe_modes[i].bytes_per_scan_line *
1470                                         par->vbe_modes[i].y_res;
1471                 if (h > size_remap)
1472                         size_remap = h;
1473         }
1474         size_remap *= 2;
1475
1476         /*
1477          *   size_vmode -- that is the amount of memory needed for the
1478          *                 used video mode, i.e. the minimum amount of
1479          *                 memory we need.
1480          */
1481         if (mode != NULL) {
1482                 size_vmode = info->var.yres * mode->bytes_per_scan_line;
1483         } else {
1484                 size_vmode = info->var.yres * info->var.xres *
1485                              ((info->var.bits_per_pixel + 7) >> 3);
1486         }
1487
1488         /*
1489          *   size_total -- all video memory we have. Used for mtrr
1490          *                 entries, resource allocation and bounds
1491          *                 checking.
1492          */
1493         size_total = par->vbe_ib.total_memory * 65536;
1494         if (vram_total)
1495                 size_total = vram_total * 1024 * 1024;
1496         if (size_total < size_vmode)
1497                 size_total = size_vmode;
1498
1499         /*
1500          *   size_remap -- the amount of video memory we are going to
1501          *                 use for vesafb.  With modern cards it is no
1502          *                 option to simply use size_total as th
1503          *                 wastes plenty of kernel address space.
1504          */
1505         if (vram_remap)
1506                 size_remap = vram_remap * 1024 * 1024;
1507         if (size_remap < size_vmode)
1508                 size_remap = size_vmode;
1509         if (size_remap > size_total)
1510                 size_remap = size_total;
1511
1512         info->fix.smem_len = size_remap;
1513         info->fix.smem_start = mode->phys_base_ptr;
1514
1515         /*
1516          * We have to set yres_virtual here because when setup_var() was
1517          * called, smem_len wasn't defined yet.
1518          */
1519         info->var.yres_virtual = info->fix.smem_len /
1520                                  mode->bytes_per_scan_line;
1521
1522         if (par->ypan && info->var.yres_virtual > info->var.yres) {
1523                 printk(KERN_INFO "uvesafb: scrolling: %s "
1524                         "using protected mode interface, "
1525                         "yres_virtual=%d\n",
1526                         (par->ypan > 1) ? "ywrap" : "ypan",
1527                         info->var.yres_virtual);
1528         } else {
1529                 printk(KERN_INFO "uvesafb: scrolling: redraw\n");
1530                 info->var.yres_virtual = info->var.yres;
1531                 par->ypan = 0;
1532         }
1533
1534         info->flags = FBINFO_FLAG_DEFAULT |
1535                         (par->ypan ? FBINFO_HWACCEL_YPAN : 0);
1536
1537         if (!par->ypan)
1538                 info->fbops->fb_pan_display = NULL;
1539 }
1540
1541 static void uvesafb_init_mtrr(struct fb_info *info)
1542 {
1543 #ifdef CONFIG_MTRR
1544         if (mtrr && !(info->fix.smem_start & (PAGE_SIZE - 1))) {
1545                 int temp_size = info->fix.smem_len;
1546                 unsigned int type = 0;
1547
1548                 switch (mtrr) {
1549                 case 1:
1550                         type = MTRR_TYPE_UNCACHABLE;
1551                         break;
1552                 case 2:
1553                         type = MTRR_TYPE_WRBACK;
1554                         break;
1555                 case 3:
1556                         type = MTRR_TYPE_WRCOMB;
1557                         break;
1558                 case 4:
1559                         type = MTRR_TYPE_WRTHROUGH;
1560                         break;
1561                 default:
1562                         type = 0;
1563                         break;
1564                 }
1565
1566                 if (type) {
1567                         int rc;
1568
1569                         /* Find the largest power-of-two */
1570                         temp_size = roundup_pow_of_two(temp_size);
1571
1572                         /* Try and find a power of two to add */
1573                         do {
1574                                 rc = mtrr_add(info->fix.smem_start,
1575                                               temp_size, type, 1);
1576                                 temp_size >>= 1;
1577                         } while (temp_size >= PAGE_SIZE && rc == -EINVAL);
1578                 }
1579         }
1580 #endif /* CONFIG_MTRR */
1581 }
1582
1583 static void uvesafb_ioremap(struct fb_info *info)
1584 {
1585 #ifdef CONFIG_X86
1586         switch (mtrr) {
1587         case 1: /* uncachable */
1588                 info->screen_base = ioremap_nocache(info->fix.smem_start, info->fix.smem_len);
1589                 break;
1590         case 2: /* write-back */
1591                 info->screen_base = ioremap_cache(info->fix.smem_start, info->fix.smem_len);
1592                 break;
1593         case 3: /* write-combining */
1594                 info->screen_base = ioremap_wc(info->fix.smem_start, info->fix.smem_len);
1595                 break;
1596         case 4: /* write-through */
1597         default:
1598                 info->screen_base = ioremap(info->fix.smem_start, info->fix.smem_len);
1599                 break;
1600         }
1601 #else
1602         info->screen_base = ioremap(info->fix.smem_start, info->fix.smem_len);
1603 #endif /* CONFIG_X86 */
1604 }
1605
1606 static ssize_t uvesafb_show_vbe_ver(struct device *dev,
1607                 struct device_attribute *attr, char *buf)
1608 {
1609         struct fb_info *info = platform_get_drvdata(to_platform_device(dev));
1610         struct uvesafb_par *par = info->par;
1611
1612         return snprintf(buf, PAGE_SIZE, "%.4x\n", par->vbe_ib.vbe_version);
1613 }
1614
1615 static DEVICE_ATTR(vbe_version, S_IRUGO, uvesafb_show_vbe_ver, NULL);
1616
1617 static ssize_t uvesafb_show_vbe_modes(struct device *dev,
1618                 struct device_attribute *attr, char *buf)
1619 {
1620         struct fb_info *info = platform_get_drvdata(to_platform_device(dev));
1621         struct uvesafb_par *par = info->par;
1622         int ret = 0, i;
1623
1624         for (i = 0; i < par->vbe_modes_cnt && ret < PAGE_SIZE; i++) {
1625                 ret += snprintf(buf + ret, PAGE_SIZE - ret,
1626                         "%dx%d-%d, 0x%.4x\n",
1627                         par->vbe_modes[i].x_res, par->vbe_modes[i].y_res,
1628                         par->vbe_modes[i].depth, par->vbe_modes[i].mode_id);
1629         }
1630
1631         return ret;
1632 }
1633
1634 static DEVICE_ATTR(vbe_modes, S_IRUGO, uvesafb_show_vbe_modes, NULL);
1635
1636 static ssize_t uvesafb_show_vendor(struct device *dev,
1637                 struct device_attribute *attr, char *buf)
1638 {
1639         struct fb_info *info = platform_get_drvdata(to_platform_device(dev));
1640         struct uvesafb_par *par = info->par;
1641
1642         if (par->vbe_ib.oem_vendor_name_ptr)
1643                 return snprintf(buf, PAGE_SIZE, "%s\n", (char *)
1644                         (&par->vbe_ib) + par->vbe_ib.oem_vendor_name_ptr);
1645         else
1646                 return 0;
1647 }
1648
1649 static DEVICE_ATTR(oem_vendor, S_IRUGO, uvesafb_show_vendor, NULL);
1650
1651 static ssize_t uvesafb_show_product_name(struct device *dev,
1652                 struct device_attribute *attr, char *buf)
1653 {
1654         struct fb_info *info = platform_get_drvdata(to_platform_device(dev));
1655         struct uvesafb_par *par = info->par;
1656
1657         if (par->vbe_ib.oem_product_name_ptr)
1658                 return snprintf(buf, PAGE_SIZE, "%s\n", (char *)
1659                         (&par->vbe_ib) + par->vbe_ib.oem_product_name_ptr);
1660         else
1661                 return 0;
1662 }
1663
1664 static DEVICE_ATTR(oem_product_name, S_IRUGO, uvesafb_show_product_name, NULL);
1665
1666 static ssize_t uvesafb_show_product_rev(struct device *dev,
1667                 struct device_attribute *attr, char *buf)
1668 {
1669         struct fb_info *info = platform_get_drvdata(to_platform_device(dev));
1670         struct uvesafb_par *par = info->par;
1671
1672         if (par->vbe_ib.oem_product_rev_ptr)
1673                 return snprintf(buf, PAGE_SIZE, "%s\n", (char *)
1674                         (&par->vbe_ib) + par->vbe_ib.oem_product_rev_ptr);
1675         else
1676                 return 0;
1677 }
1678
1679 static DEVICE_ATTR(oem_product_rev, S_IRUGO, uvesafb_show_product_rev, NULL);
1680
1681 static ssize_t uvesafb_show_oem_string(struct device *dev,
1682                 struct device_attribute *attr, char *buf)
1683 {
1684         struct fb_info *info = platform_get_drvdata(to_platform_device(dev));
1685         struct uvesafb_par *par = info->par;
1686
1687         if (par->vbe_ib.oem_string_ptr)
1688                 return snprintf(buf, PAGE_SIZE, "%s\n",
1689                         (char *)(&par->vbe_ib) + par->vbe_ib.oem_string_ptr);
1690         else
1691                 return 0;
1692 }
1693
1694 static DEVICE_ATTR(oem_string, S_IRUGO, uvesafb_show_oem_string, NULL);
1695
1696 static ssize_t uvesafb_show_nocrtc(struct device *dev,
1697                 struct device_attribute *attr, char *buf)
1698 {
1699         struct fb_info *info = platform_get_drvdata(to_platform_device(dev));
1700         struct uvesafb_par *par = info->par;
1701
1702         return snprintf(buf, PAGE_SIZE, "%d\n", par->nocrtc);
1703 }
1704
1705 static ssize_t uvesafb_store_nocrtc(struct device *dev,
1706                 struct device_attribute *attr, const char *buf, size_t count)
1707 {
1708         struct fb_info *info = platform_get_drvdata(to_platform_device(dev));
1709         struct uvesafb_par *par = info->par;
1710
1711         if (count > 0) {
1712                 if (buf[0] == '0')
1713                         par->nocrtc = 0;
1714                 else
1715                         par->nocrtc = 1;
1716         }
1717         return count;
1718 }
1719
1720 static DEVICE_ATTR(nocrtc, S_IRUGO | S_IWUSR, uvesafb_show_nocrtc,
1721                         uvesafb_store_nocrtc);
1722
1723 static struct attribute *uvesafb_dev_attrs[] = {
1724         &dev_attr_vbe_version.attr,
1725         &dev_attr_vbe_modes.attr,
1726         &dev_attr_oem_vendor.attr,
1727         &dev_attr_oem_product_name.attr,
1728         &dev_attr_oem_product_rev.attr,
1729         &dev_attr_oem_string.attr,
1730         &dev_attr_nocrtc.attr,
1731         NULL,
1732 };
1733
1734 static struct attribute_group uvesafb_dev_attgrp = {
1735         .name = NULL,
1736         .attrs = uvesafb_dev_attrs,
1737 };
1738
1739 static int uvesafb_probe(struct platform_device *dev)
1740 {
1741         struct fb_info *info;
1742         struct vbe_mode_ib *mode = NULL;
1743         struct uvesafb_par *par;
1744         int err = 0, i;
1745
1746         info = framebuffer_alloc(sizeof(*par) + sizeof(u32) * 256, &dev->dev);
1747         if (!info)
1748                 return -ENOMEM;
1749
1750         par = info->par;
1751
1752         err = uvesafb_vbe_init(info);
1753         if (err) {
1754                 printk(KERN_ERR "uvesafb: vbe_init() failed with %d\n", err);
1755                 goto out;
1756         }
1757
1758         info->fbops = &uvesafb_ops;
1759
1760         i = uvesafb_vbe_init_mode(info);
1761         if (i < 0) {
1762                 err = -EINVAL;
1763                 goto out;
1764         } else {
1765                 mode = &par->vbe_modes[i];
1766         }
1767
1768         if (fb_alloc_cmap(&info->cmap, 256, 0) < 0) {
1769                 err = -ENXIO;
1770                 goto out;
1771         }
1772
1773         uvesafb_init_info(info, mode);
1774
1775         if (!request_region(0x3c0, 32, "uvesafb")) {
1776                 printk(KERN_ERR "uvesafb: request region 0x3c0-0x3e0 failed\n");
1777                 err = -EIO;
1778                 goto out_mode;
1779         }
1780
1781         if (!request_mem_region(info->fix.smem_start, info->fix.smem_len,
1782                                 "uvesafb")) {
1783                 printk(KERN_ERR "uvesafb: cannot reserve video memory at "
1784                                 "0x%lx\n", info->fix.smem_start);
1785                 err = -EIO;
1786                 goto out_reg;
1787         }
1788
1789         uvesafb_init_mtrr(info);
1790         uvesafb_ioremap(info);
1791
1792         if (!info->screen_base) {
1793                 printk(KERN_ERR
1794                         "uvesafb: abort, cannot ioremap 0x%x bytes of video "
1795                         "memory at 0x%lx\n",
1796                         info->fix.smem_len, info->fix.smem_start);
1797                 err = -EIO;
1798                 goto out_mem;
1799         }
1800
1801         platform_set_drvdata(dev, info);
1802
1803         if (register_framebuffer(info) < 0) {
1804                 printk(KERN_ERR
1805                         "uvesafb: failed to register framebuffer device\n");
1806                 err = -EINVAL;
1807                 goto out_unmap;
1808         }
1809
1810         printk(KERN_INFO "uvesafb: framebuffer at 0x%lx, mapped to 0x%p, "
1811                         "using %dk, total %dk\n", info->fix.smem_start,
1812                         info->screen_base, info->fix.smem_len/1024,
1813                         par->vbe_ib.total_memory * 64);
1814         printk(KERN_INFO "fb%d: %s frame buffer device\n", info->node,
1815                         info->fix.id);
1816
1817         err = sysfs_create_group(&dev->dev.kobj, &uvesafb_dev_attgrp);
1818         if (err != 0)
1819                 printk(KERN_WARNING "fb%d: failed to register attributes\n",
1820                         info->node);
1821
1822         return 0;
1823
1824 out_unmap:
1825         iounmap(info->screen_base);
1826 out_mem:
1827         release_mem_region(info->fix.smem_start, info->fix.smem_len);
1828 out_reg:
1829         release_region(0x3c0, 32);
1830 out_mode:
1831         if (!list_empty(&info->modelist))
1832                 fb_destroy_modelist(&info->modelist);
1833         fb_destroy_modedb(info->monspecs.modedb);
1834         fb_dealloc_cmap(&info->cmap);
1835 out:
1836         if (par->vbe_modes)
1837                 kfree(par->vbe_modes);
1838
1839         framebuffer_release(info);
1840         return err;
1841 }
1842
1843 static int uvesafb_remove(struct platform_device *dev)
1844 {
1845         struct fb_info *info = platform_get_drvdata(dev);
1846
1847         if (info) {
1848                 struct uvesafb_par *par = info->par;
1849
1850                 sysfs_remove_group(&dev->dev.kobj, &uvesafb_dev_attgrp);
1851                 unregister_framebuffer(info);
1852                 release_region(0x3c0, 32);
1853                 iounmap(info->screen_base);
1854                 release_mem_region(info->fix.smem_start, info->fix.smem_len);
1855                 fb_destroy_modedb(info->monspecs.modedb);
1856                 fb_dealloc_cmap(&info->cmap);
1857
1858                 if (par) {
1859                         if (par->vbe_modes)
1860                                 kfree(par->vbe_modes);
1861                         if (par->vbe_state_orig)
1862                                 kfree(par->vbe_state_orig);
1863                         if (par->vbe_state_saved)
1864                                 kfree(par->vbe_state_saved);
1865                 }
1866
1867                 framebuffer_release(info);
1868         }
1869         return 0;
1870 }
1871
1872 static struct platform_driver uvesafb_driver = {
1873         .probe  = uvesafb_probe,
1874         .remove = uvesafb_remove,
1875         .driver = {
1876                 .name = "uvesafb",
1877         },
1878 };
1879
1880 static struct platform_device *uvesafb_device;
1881
1882 #ifndef MODULE
1883 static int uvesafb_setup(char *options)
1884 {
1885         char *this_opt;
1886
1887         if (!options || !*options)
1888                 return 0;
1889
1890         while ((this_opt = strsep(&options, ",")) != NULL) {
1891                 if (!*this_opt) continue;
1892
1893                 if (!strcmp(this_opt, "redraw"))
1894                         ypan = 0;
1895                 else if (!strcmp(this_opt, "ypan"))
1896                         ypan = 1;
1897                 else if (!strcmp(this_opt, "ywrap"))
1898                         ypan = 2;
1899                 else if (!strcmp(this_opt, "vgapal"))
1900                         pmi_setpal = 0;
1901                 else if (!strcmp(this_opt, "pmipal"))
1902                         pmi_setpal = 1;
1903                 else if (!strncmp(this_opt, "mtrr:", 5))
1904                         mtrr = simple_strtoul(this_opt+5, NULL, 0);
1905                 else if (!strcmp(this_opt, "nomtrr"))
1906                         mtrr = 0;
1907                 else if (!strcmp(this_opt, "nocrtc"))
1908                         nocrtc = 1;
1909                 else if (!strcmp(this_opt, "noedid"))
1910                         noedid = 1;
1911                 else if (!strcmp(this_opt, "noblank"))
1912                         blank = 0;
1913                 else if (!strncmp(this_opt, "vtotal:", 7))
1914                         vram_total = simple_strtoul(this_opt + 7, NULL, 0);
1915                 else if (!strncmp(this_opt, "vremap:", 7))
1916                         vram_remap = simple_strtoul(this_opt + 7, NULL, 0);
1917                 else if (!strncmp(this_opt, "maxhf:", 6))
1918                         maxhf = simple_strtoul(this_opt + 6, NULL, 0);
1919                 else if (!strncmp(this_opt, "maxvf:", 6))
1920                         maxvf = simple_strtoul(this_opt + 6, NULL, 0);
1921                 else if (!strncmp(this_opt, "maxclk:", 7))
1922                         maxclk = simple_strtoul(this_opt + 7, NULL, 0);
1923                 else if (!strncmp(this_opt, "vbemode:", 8))
1924                         vbemode = simple_strtoul(this_opt + 8, NULL, 0);
1925                 else if (this_opt[0] >= '0' && this_opt[0] <= '9') {
1926                         mode_option = this_opt;
1927                 } else {
1928                         printk(KERN_WARNING
1929                                 "uvesafb: unrecognized option %s\n", this_opt);
1930                 }
1931         }
1932
1933         return 0;
1934 }
1935 #endif /* !MODULE */
1936
1937 static ssize_t show_v86d(struct device_driver *dev, char *buf)
1938 {
1939         return snprintf(buf, PAGE_SIZE, "%s\n", v86d_path);
1940 }
1941
1942 static ssize_t store_v86d(struct device_driver *dev, const char *buf,
1943                 size_t count)
1944 {
1945         strncpy(v86d_path, buf, PATH_MAX);
1946         return count;
1947 }
1948
1949 static DRIVER_ATTR(v86d, S_IRUGO | S_IWUSR, show_v86d, store_v86d);
1950
1951 static int uvesafb_init(void)
1952 {
1953         int err;
1954
1955 #ifndef MODULE
1956         char *option = NULL;
1957
1958         if (fb_get_options("uvesafb", &option))
1959                 return -ENODEV;
1960         uvesafb_setup(option);
1961 #endif
1962         err = cn_add_callback(&uvesafb_cn_id, "uvesafb", uvesafb_cn_callback);
1963         if (err)
1964                 return err;
1965
1966         err = platform_driver_register(&uvesafb_driver);
1967
1968         if (!err) {
1969                 uvesafb_device = platform_device_alloc("uvesafb", 0);
1970                 if (uvesafb_device)
1971                         err = platform_device_add(uvesafb_device);
1972                 else
1973                         err = -ENOMEM;
1974
1975                 if (err) {
1976                         platform_device_put(uvesafb_device);
1977                         platform_driver_unregister(&uvesafb_driver);
1978                         cn_del_callback(&uvesafb_cn_id);
1979                         return err;
1980                 }
1981
1982                 err = driver_create_file(&uvesafb_driver.driver,
1983                                 &driver_attr_v86d);
1984                 if (err) {
1985                         printk(KERN_WARNING "uvesafb: failed to register "
1986                                         "attributes\n");
1987                         err = 0;
1988                 }
1989         }
1990         return err;
1991 }
1992
1993 module_init(uvesafb_init);
1994
1995 static void uvesafb_exit(void)
1996 {
1997         struct uvesafb_ktask *task;
1998
1999         if (v86d_started) {
2000                 task = uvesafb_prep();
2001                 if (task) {
2002                         task->t.flags = TF_EXIT;
2003                         uvesafb_exec(task);
2004                         uvesafb_free(task);
2005                 }
2006         }
2007
2008         cn_del_callback(&uvesafb_cn_id);
2009         driver_remove_file(&uvesafb_driver.driver, &driver_attr_v86d);
2010         platform_device_unregister(uvesafb_device);
2011         platform_driver_unregister(&uvesafb_driver);
2012 }
2013
2014 module_exit(uvesafb_exit);
2015
2016 static int param_set_scroll(const char *val, const struct kernel_param *kp)
2017 {
2018         ypan = 0;
2019
2020         if (!strcmp(val, "redraw"))
2021                 ypan = 0;
2022         else if (!strcmp(val, "ypan"))
2023                 ypan = 1;
2024         else if (!strcmp(val, "ywrap"))
2025                 ypan = 2;
2026         else
2027                 return -EINVAL;
2028
2029         return 0;
2030 }
2031 static struct kernel_param_ops param_ops_scroll = {
2032         .set = param_set_scroll,
2033 };
2034 #define param_check_scroll(name, p) __param_check(name, p, void)
2035
2036 module_param_named(scroll, ypan, scroll, 0);
2037 MODULE_PARM_DESC(scroll,
2038         "Scrolling mode, set to 'redraw', 'ypan', or 'ywrap'");
2039 module_param_named(vgapal, pmi_setpal, invbool, 0);
2040 MODULE_PARM_DESC(vgapal, "Set palette using VGA registers");
2041 module_param_named(pmipal, pmi_setpal, bool, 0);
2042 MODULE_PARM_DESC(pmipal, "Set palette using PMI calls");
2043 module_param(mtrr, uint, 0);
2044 MODULE_PARM_DESC(mtrr,
2045         "Memory Type Range Registers setting. Use 0 to disable.");
2046 module_param(blank, bool, 0);
2047 MODULE_PARM_DESC(blank, "Enable hardware blanking");
2048 module_param(nocrtc, bool, 0);
2049 MODULE_PARM_DESC(nocrtc, "Ignore CRTC timings when setting modes");
2050 module_param(noedid, bool, 0);
2051 MODULE_PARM_DESC(noedid,
2052         "Ignore EDID-provided monitor limits when setting modes");
2053 module_param(vram_remap, uint, 0);
2054 MODULE_PARM_DESC(vram_remap, "Set amount of video memory to be used [MiB]");
2055 module_param(vram_total, uint, 0);
2056 MODULE_PARM_DESC(vram_total, "Set total amount of video memoery [MiB]");
2057 module_param(maxclk, ushort, 0);
2058 MODULE_PARM_DESC(maxclk, "Maximum pixelclock [MHz], overrides EDID data");
2059 module_param(maxhf, ushort, 0);
2060 MODULE_PARM_DESC(maxhf,
2061         "Maximum horizontal frequency [kHz], overrides EDID data");
2062 module_param(maxvf, ushort, 0);
2063 MODULE_PARM_DESC(maxvf,
2064         "Maximum vertical frequency [Hz], overrides EDID data");
2065 module_param(mode_option, charp, 0);
2066 MODULE_PARM_DESC(mode_option,
2067         "Specify initial video mode as \"<xres>x<yres>[-<bpp>][@<refresh>]\"");
2068 module_param(vbemode, ushort, 0);
2069 MODULE_PARM_DESC(vbemode,
2070         "VBE mode number to set, overrides the 'mode' option");
2071 module_param_string(v86d, v86d_path, PATH_MAX, 0660);
2072 MODULE_PARM_DESC(v86d, "Path to the v86d userspace helper.");
2073
2074 MODULE_LICENSE("GPL");
2075 MODULE_AUTHOR("Michal Januszewski <spock@gentoo.org>");
2076 MODULE_DESCRIPTION("Framebuffer driver for VBE2.0+ compliant graphics boards");
2077