drivers/video/uvesafb.c

   1 /*
   2  * A framebuffer driver for VBE 2.0+ compliant video cards
   3  *
   4  * (c) 2007 Michal Januszewski <spock@gentoo.org>
   5  *     Loosely based upon the vesafb driver.
   6  *
   7  */
   8 #include <linux/init.h>
   9 #include <linux/module.h>
  10 #include <linux/moduleparam.h>
  11 #include <linux/skbuff.h>
  12 #include <linux/timer.h>
  13 #include <linux/completion.h>
  14 #include <linux/connector.h>
  15 #include <linux/random.h>
  16 #include <linux/platform_device.h>
  17 #include <linux/limits.h>
  18 #include <linux/fb.h>
  19 #include <linux/io.h>
  20 #include <linux/mutex.h>
  21 #include <video/edid.h>
  22 #include <video/uvesafb.h>
  23 #ifdef CONFIG_X86
  24 #include <video/vga.h>
  25 #endif
  26 #ifdef CONFIG_MTRR
  27 #include <asm/mtrr.h>
  28 #endif
  29 #include "edid.h"
  30
  31 static struct cb_id uvesafb_cn_id = {
  32         .idx = CN_IDX_V86D,
  33         .val = CN_VAL_V86D_UVESAFB
  34 };
  35 static char v86d_path[PATH_MAX] = "/sbin/v86d";
  36 static char v86d_started;       /* has v86d been started by uvesafb? */
  37
  38 static struct fb_fix_screeninfo uvesafb_fix __devinitdata = {
  39         .id     = "VESA VGA",
  40         .type   = FB_TYPE_PACKED_PIXELS,
  41         .accel  = FB_ACCEL_NONE,
  42         .visual = FB_VISUAL_TRUECOLOR,
  43 };
  44
  45 static int mtrr         __devinitdata = 3; /* enable mtrr by default */
  46 static int blank        = 1;               /* enable blanking by default */
  47 static int ypan         = 1;             /* 0: scroll, 1: ypan, 2: ywrap */
  48 static int pmi_setpal   __devinitdata = 1; /* use PMI for palette changes */
  49 static int nocrtc       __devinitdata; /* ignore CRTC settings */
  50 static int noedid       __devinitdata; /* don't try DDC transfers */
  51 static int vram_remap   __devinitdata; /* set amt. of memory to be used */
  52 static int vram_total   __devinitdata; /* set total amount of memory */
  53 static u16 maxclk       __devinitdata; /* maximum pixel clock */
  54 static u16 maxvf        __devinitdata; /* maximum vertical frequency */
  55 static u16 maxhf        __devinitdata; /* maximum horizontal frequency */
  56 static u16 vbemode      __devinitdata; /* force use of a specific VBE mode */
  57 static char *mode_option __devinitdata;
  58
  59 static struct uvesafb_ktask *uvfb_tasks[UVESAFB_TASKS_MAX];
  60 static DEFINE_MUTEX(uvfb_lock);
  61
  62 /*
  63  * A handler for replies from userspace.
  64  *
  65  * Make sure each message passes consistency checks and if it does,
  66  * find the kernel part of the task struct, copy the registers and
  67  * the buffer contents and then complete the task.
  68  */
  69 static void uvesafb_cn_callback(void *data)
  70 {
  71         struct cn_msg *msg = data;
  72         struct uvesafb_task *utask;
  73         struct uvesafb_ktask *task;
  74
  75         if (msg->seq >= UVESAFB_TASKS_MAX)
  76                 return;
  77
  78         mutex_lock(&uvfb_lock);
  79         task = uvfb_tasks[msg->seq];
  80
  81         if (!task || msg->ack != task->ack) {
  82                 mutex_unlock(&uvfb_lock);
  83                 return;
  84         }
  85
  86         utask = (struct uvesafb_task *)msg->data;
  87
  88         /* Sanity checks for the buffer length. */
  89         if (task->t.buf_len < utask->buf_len ||
  90             utask->buf_len > msg->len - sizeof(*utask)) {
  91                 mutex_unlock(&uvfb_lock);
  92                 return;
  93         }
  94
  95         uvfb_tasks[msg->seq] = NULL;
  96         mutex_unlock(&uvfb_lock);
  97
  98         memcpy(&task->t, utask, sizeof(*utask));
  99
 100         if (task->t.buf_len && task->buf)
 101                 memcpy(task->buf, utask + 1, task->t.buf_len);
 102
 103         complete(task->done);
 104         return;
 105 }
 106
 107 static int uvesafb_helper_start(void)
 108 {
 109         char *envp[] = {
 110                 "HOME=/",
 111                 "PATH=/sbin:/bin",
 112                 NULL,
 113         };
 114
 115         char *argv[] = {
 116                 v86d_path,
 117                 NULL,
 118         };
 119
 120         return call_usermodehelper(v86d_path, argv, envp, 1);
 121 }
 122
 123 /*
 124  * Execute a uvesafb task.
 125  *
 126  * Returns 0 if the task is executed successfully.
 127  *
 128  * A message sent to the userspace consists of the uvesafb_task
 129  * struct and (optionally) a buffer. The uvesafb_task struct is
 130  * a simplified version of uvesafb_ktask (its kernel counterpart)
 131  * containing only the register values, flags and the length of
 132  * the buffer.
 133  *
 134  * Each message is assigned a sequence number (increased linearly)
 135  * and a random ack number. The sequence number is used as a key
 136  * for the uvfb_tasks array which holds pointers to uvesafb_ktask
 137  * structs for all requests.
 138  */
 139 static int uvesafb_exec(struct uvesafb_ktask *task)
 140 {
 141         static int seq;
 142         struct cn_msg *m;
 143         int err;
 144         int len = sizeof(task->t) + task->t.buf_len;
 145
 146         /*
 147          * Check whether the message isn't longer than the maximum
 148          * allowed by connector.
 149          */
 150         if (sizeof(*m) + len > CONNECTOR_MAX_MSG_SIZE) {
 151                 printk(KERN_WARNING "uvesafb: message too long (%d), "
 152                         "can't execute task\n", (int)(sizeof(*m) + len));
 153                 return -E2BIG;
 154         }
 155
 156         m = kzalloc(sizeof(*m) + len, GFP_KERNEL);
 157         if (!m)
 158                 return -ENOMEM;
 159
 160         init_completion(task->done);
 161
 162         memcpy(&m->id, &uvesafb_cn_id, sizeof(m->id));
 163         m->seq = seq;
 164         m->len = len;
 165         m->ack = random32();
 166
 167         /* uvesafb_task structure */
 168         memcpy(m + 1, &task->t, sizeof(task->t));
 169
 170         /* Buffer */
 171         memcpy((u8 *)(m + 1) + sizeof(task->t), task->buf, task->t.buf_len);
 172
 173         /*
 174          * Save the message ack number so that we can find the kernel
 175          * part of this task when a reply is received from userspace.
 176          */
 177         task->ack = m->ack;
 178
 179         mutex_lock(&uvfb_lock);
 180
 181         /* If all slots are taken -- bail out. */
 182         if (uvfb_tasks[seq]) {
 183                 mutex_unlock(&uvfb_lock);
 184                 err = -EBUSY;
 185                 goto out;
 186         }
 187
 188         /* Save a pointer to the kernel part of the task struct. */
 189         uvfb_tasks[seq] = task;
 190         mutex_unlock(&uvfb_lock);
 191
 192         err = cn_netlink_send(m, 0, GFP_KERNEL);
 193         if (err == -ESRCH) {
 194                 /*
 195                  * Try to start the userspace helper if sending
 196                  * the request failed the first time.
 197                  */
 198                 err = uvesafb_helper_start();
 199                 if (err) {
 200                         printk(KERN_ERR "uvesafb: failed to execute %s\n",
 201                                         v86d_path);
 202                         printk(KERN_ERR "uvesafb: make sure that the v86d "
 203                                         "helper is installed and executable\n");
 204                 } else {
 205                         v86d_started = 1;
 206                         err = cn_netlink_send(m, 0, gfp_any());
 207                         if (err == -ENOBUFS)
 208                                 err = 0;
 209                 }
 210         } else if (err == -ENOBUFS)
 211                 err = 0;
 212
 213         if (!err && !(task->t.flags & TF_EXIT))
 214                 err = !wait_for_completion_timeout(task->done,
 215                                 msecs_to_jiffies(UVESAFB_TIMEOUT));
 216
 217         mutex_lock(&uvfb_lock);
 218         uvfb_tasks[seq] = NULL;
 219         mutex_unlock(&uvfb_lock);
 220
 221         seq++;
 222         if (seq >= UVESAFB_TASKS_MAX)
 223                 seq = 0;
 224 out:
 225         kfree(m);
 226         return err;
 227 }
 228
 229 /*
 230  * Free a uvesafb_ktask struct.
 231  */
 232 static void uvesafb_free(struct uvesafb_ktask *task)
 233 {
 234         if (task) {
 235                 if (task->done)
 236                         kfree(task->done);
 237                 kfree(task);
 238         }
 239 }
 240
 241 /*
 242  * Prepare a uvesafb_ktask struct to be used again.
 243  */
 244 static void uvesafb_reset(struct uvesafb_ktask *task)
 245 {
 246         struct completion *cpl = task->done;
 247
 248         memset(task, 0, sizeof(*task));
 249         task->done = cpl;
 250 }
 251
 252 /*
 253  * Allocate and prepare a uvesafb_ktask struct.
 254  */
 255 static struct uvesafb_ktask *uvesafb_prep(void)
 256 {
 257         struct uvesafb_ktask *task;
 258
 259         task = kzalloc(sizeof(*task), GFP_KERNEL);
 260         if (task) {
 261                 task->done = kzalloc(sizeof(*task->done), GFP_KERNEL);
 262                 if (!task->done) {
 263                         kfree(task);
 264                         task = NULL;
 265                 }
 266         }
 267         return task;
 268 }
 269
 270 static void uvesafb_setup_var(struct fb_var_screeninfo *var,
 271                 struct fb_info *info, struct vbe_mode_ib *mode)
 272 {
 273         struct uvesafb_par *par = info->par;
 274
 275         var->vmode = FB_VMODE_NONINTERLACED;
 276         var->sync = FB_SYNC_VERT_HIGH_ACT;
 277
 278         var->xres = mode->x_res;
 279         var->yres = mode->y_res;
 280         var->xres_virtual = mode->x_res;
 281         var->yres_virtual = (par->ypan) ?
 282                         info->fix.smem_len / mode->bytes_per_scan_line :
 283                         mode->y_res;
 284         var->xoffset = 0;
 285         var->yoffset = 0;
 286         var->bits_per_pixel = mode->bits_per_pixel;
 287
 288         if (var->bits_per_pixel == 15)
 289                 var->bits_per_pixel = 16;
 290
 291         if (var->bits_per_pixel > 8) {
 292                 var->red.offset    = mode->red_off;
 293                 var->red.length    = mode->red_len;
 294                 var->green.offset  = mode->green_off;
 295                 var->green.length  = mode->green_len;
 296                 var->blue.offset   = mode->blue_off;
 297                 var->blue.length   = mode->blue_len;
 298                 var->transp.offset = mode->rsvd_off;
 299                 var->transp.length = mode->rsvd_len;
 300         } else {
 301                 var->red.offset    = 0;
 302                 var->green.offset  = 0;
 303                 var->blue.offset   = 0;
 304                 var->transp.offset = 0;
 305
 306                 /*
 307                  * We're assuming that we can switch the DAC to 8 bits. If
 308                  * this proves to be incorrect, we'll update the fields
 309                  * later in set_par().
 310                  */
 311                 if (par->vbe_ib.capabilities & VBE_CAP_CAN_SWITCH_DAC) {
 312                         var->red.length    = 8;
 313                         var->green.length  = 8;
 314                         var->blue.length   = 8;
 315                         var->transp.length = 0;
 316                 } else {
 317                         var->red.length    = 6;
 318                         var->green.length  = 6;
 319                         var->blue.length   = 6;
 320                         var->transp.length = 0;
 321                 }
 322         }
 323 }
 324
 325 static int uvesafb_vbe_find_mode(struct uvesafb_par *par,
 326                 int xres, int yres, int depth, unsigned char flags)
 327 {
 328         int i, match = -1, h = 0, d = 0x7fffffff;
 329
 330         for (i = 0; i < par->vbe_modes_cnt; i++) {
 331                 h = abs(par->vbe_modes[i].x_res - xres) +
 332                     abs(par->vbe_modes[i].y_res - yres) +
 333                     abs(depth - par->vbe_modes[i].depth);
 334
 335                 /*
 336                  * We have an exact match in terms of resolution
 337                  * and depth.
 338                  */
 339                 if (h == 0)
 340                         return i;
 341
 342                 if (h < d || (h == d && par->vbe_modes[i].depth > depth)) {
 343                         d = h;
 344                         match = i;
 345                 }
 346         }
 347         i = 1;
 348
 349         if (flags & UVESAFB_EXACT_DEPTH &&
 350                         par->vbe_modes[match].depth != depth)
 351                 i = 0;
 352
 353         if (flags & UVESAFB_EXACT_RES && d > 24)
 354                 i = 0;
 355
 356         if (i != 0)
 357                 return match;
 358         else
 359                 return -1;
 360 }
 361
 362 static u8 *uvesafb_vbe_state_save(struct uvesafb_par *par)
 363 {
 364         struct uvesafb_ktask *task;
 365         u8 *state;
 366         int err;
 367
 368         if (!par->vbe_state_size)
 369                 return NULL;
 370
 371         state = kmalloc(par->vbe_state_size, GFP_KERNEL);
 372         if (!state)
 373                 return NULL;
 374
 375         task = uvesafb_prep();
 376         if (!task) {
 377                 kfree(state);
 378                 return NULL;
 379         }
 380
 381         task->t.regs.eax = 0x4f04;
 382         task->t.regs.ecx = 0x000f;
 383         task->t.regs.edx = 0x0001;
 384         task->t.flags = TF_BUF_RET | TF_BUF_ESBX;
 385         task->t.buf_len = par->vbe_state_size;
 386         task->buf = state;
 387         err = uvesafb_exec(task);
 388
 389         if (err || (task->t.regs.eax & 0xffff) != 0x004f) {
 390                 printk(KERN_WARNING "uvesafb: VBE get state call "
 391                                 "failed (eax=0x%x, err=%d)\n",
 392                                 task->t.regs.eax, err);
 393                 kfree(state);
 394                 state = NULL;
 395         }
 396
 397         uvesafb_free(task);
 398         return state;
 399 }
 400
 401 static void uvesafb_vbe_state_restore(struct uvesafb_par *par, u8 *state_buf)
 402 {
 403         struct uvesafb_ktask *task;
 404         int err;
 405
 406         if (!state_buf)
 407                 return;
 408
 409         task = uvesafb_prep();
 410         if (!task)
 411                 return;
 412
 413         task->t.regs.eax = 0x4f04;
 414         task->t.regs.ecx = 0x000f;
 415         task->t.regs.edx = 0x0002;
 416         task->t.buf_len = par->vbe_state_size;
 417         task->t.flags = TF_BUF_ESBX;
 418         task->buf = state_buf;
 419
 420         err = uvesafb_exec(task);
 421         if (err || (task->t.regs.eax & 0xffff) != 0x004f)
 422                 printk(KERN_WARNING "uvesafb: VBE state restore call "
 423                                 "failed (eax=0x%x, err=%d)\n",
 424                                 task->t.regs.eax, err);
 425
 426         uvesafb_free(task);
 427 }
 428
 429 static int __devinit uvesafb_vbe_getinfo(struct uvesafb_ktask *task,
 430                 struct uvesafb_par *par)
 431 {
 432         int err;
 433
 434         task->t.regs.eax = 0x4f00;
 435         task->t.flags = TF_VBEIB;
 436         task->t.buf_len = sizeof(struct vbe_ib);
 437         task->buf = &par->vbe_ib;
 438         strncpy(par->vbe_ib.vbe_signature, "VBE2", 4);
 439
 440         err = uvesafb_exec(task);
 441         if (err || (task->t.regs.eax & 0xffff) != 0x004f) {
 442                 printk(KERN_ERR "uvesafb: Getting VBE info block failed "
 443                                 "(eax=0x%x, err=%d)\n", (u32)task->t.regs.eax,
 444                                 err);
 445                 return -EINVAL;
 446         }
 447
 448         if (par->vbe_ib.vbe_version < 0x0200) {
 449                 printk(KERN_ERR "uvesafb: Sorry, pre-VBE 2.0 cards are "
 450                                 "not supported.\n");
 451                 return -EINVAL;
 452         }
 453
 454         if (!par->vbe_ib.mode_list_ptr) {
 455                 printk(KERN_ERR "uvesafb: Missing mode list!\n");
 456                 return -EINVAL;
 457         }
 458
 459         printk(KERN_INFO "uvesafb: ");
 460
 461         /*
 462          * Convert string pointers and the mode list pointer into
 463          * usable addresses. Print informational messages about the
 464          * video adapter and its vendor.
 465          */
 466         if (par->vbe_ib.oem_vendor_name_ptr)
 467                 printk("%s, ",
 468                         ((char *)task->buf) + par->vbe_ib.oem_vendor_name_ptr);
 469
 470         if (par->vbe_ib.oem_product_name_ptr)
 471                 printk("%s, ",
 472                         ((char *)task->buf) + par->vbe_ib.oem_product_name_ptr);
 473
 474         if (par->vbe_ib.oem_product_rev_ptr)
 475                 printk("%s, ",
 476                         ((char *)task->buf) + par->vbe_ib.oem_product_rev_ptr);
 477
 478         if (par->vbe_ib.oem_string_ptr)
 479                 printk("OEM: %s, ",
 480                         ((char *)task->buf) + par->vbe_ib.oem_string_ptr);
 481
 482         printk("VBE v%d.%d\n", ((par->vbe_ib.vbe_version & 0xff00) >> 8),
 483                         par->vbe_ib.vbe_version & 0xff);
 484
 485         return 0;
 486 }
 487
 488 static int __devinit uvesafb_vbe_getmodes(struct uvesafb_ktask *task,
 489                 struct uvesafb_par *par)
 490 {
 491         int off = 0, err;
 492         u16 *mode;
 493
 494         par->vbe_modes_cnt = 0;
 495
 496         /* Count available modes. */
 497         mode = (u16 *) (((u8 *)&par->vbe_ib) + par->vbe_ib.mode_list_ptr);
 498         while (*mode != 0xffff) {
 499                 par->vbe_modes_cnt++;
 500                 mode++;
 501         }
 502
 503         par->vbe_modes = kzalloc(sizeof(struct vbe_mode_ib) *
 504                                 par->vbe_modes_cnt, GFP_KERNEL);
 505         if (!par->vbe_modes)
 506                 return -ENOMEM;
 507
 508         /* Get info about all available modes. */
 509         mode = (u16 *) (((u8 *)&par->vbe_ib) + par->vbe_ib.mode_list_ptr);
 510         while (*mode != 0xffff) {
 511                 struct vbe_mode_ib *mib;
 512
 513                 uvesafb_reset(task);
 514                 task->t.regs.eax = 0x4f01;
 515                 task->t.regs.ecx = (u32) *mode;
 516                 task->t.flags = TF_BUF_RET | TF_BUF_ESDI;
 517                 task->t.buf_len = sizeof(struct vbe_mode_ib);
 518                 task->buf = par->vbe_modes + off;
 519
 520                 err = uvesafb_exec(task);
 521                 if (err || (task->t.regs.eax & 0xffff) != 0x004f) {
 522                         printk(KERN_WARNING "uvesafb: Getting mode info block "
 523                                 "for mode 0x%x failed (eax=0x%x, err=%d)\n",
 524                                 *mode, (u32)task->t.regs.eax, err);
 525                         mode++;
 526                         par->vbe_modes_cnt--;
 527                         continue;
 528                 }
 529
 530                 mib = task->buf;
 531                 mib->mode_id = *mode;
 532
 533                 /*
 534                  * We only want modes that are supported with the current
 535                  * hardware configuration, color, graphics and that have
 536                  * support for the LFB.
 537                  */
 538                 if ((mib->mode_attr & VBE_MODE_MASK) == VBE_MODE_MASK &&
 539                                  mib->bits_per_pixel >= 8)
 540                         off++;
 541                 else
 542                         par->vbe_modes_cnt--;
 543
 544                 mode++;
 545                 mib->depth = mib->red_len + mib->green_len + mib->blue_len;
 546
 547                 /*
 548                  * Handle 8bpp modes and modes with broken color component
 549                  * lengths.
 550                  */
 551                 if (mib->depth == 0 || (mib->depth == 24 &&
 552                                         mib->bits_per_pixel == 32))
 553                         mib->depth = mib->bits_per_pixel;
 554         }
 555
 556         if (par->vbe_modes_cnt > 0)
 557                 return 0;
 558         else
 559                 return -EINVAL;
 560 }
 561
 562 /*
 563  * The Protected Mode Interface is 32-bit x86 code, so we only run it on
 564  * x86 and not x86_64.
 565  */
 566 #ifdef CONFIG_X86_32
 567 static int __devinit uvesafb_vbe_getpmi(struct uvesafb_ktask *task,
 568                 struct uvesafb_par *par)
 569 {
 570         int i, err;
 571
 572         uvesafb_reset(task);
 573         task->t.regs.eax = 0x4f0a;
 574         task->t.regs.ebx = 0x0;
 575         err = uvesafb_exec(task);
 576
 577         if ((task->t.regs.eax & 0xffff) != 0x4f || task->t.regs.es < 0xc000) {
 578                 par->pmi_setpal = par->ypan = 0;
 579         } else {
 580                 par->pmi_base = (u16 *)phys_to_virt(((u32)task->t.regs.es << 4)
 581                                                 + task->t.regs.edi);
 582                 par->pmi_start = (u8 *)par->pmi_base + par->pmi_base[1];
 583                 par->pmi_pal = (u8 *)par->pmi_base + par->pmi_base[2];
 584                 printk(KERN_INFO "uvesafb: protected mode interface info at "
 585                                  "%04x:%04x\n",
 586                                  (u16)task->t.regs.es, (u16)task->t.regs.edi);
 587                 printk(KERN_INFO "uvesafb: pmi: set display start = %p, "
 588                                  "set palette = %p\n", par->pmi_start,
 589                                  par->pmi_pal);
 590
 591                 if (par->pmi_base[3]) {
 592                         printk(KERN_INFO "uvesafb: pmi: ports = ");
 593                         for (i = par->pmi_base[3]/2;
 594                                         par->pmi_base[i] != 0xffff; i++)
 595                                 printk("%x ", par->pmi_base[i]);
 596                         printk("\n");
 597
 598                         if (par->pmi_base[i] != 0xffff) {
 599                                 printk(KERN_INFO "uvesafb: can't handle memory"
 600                                                  " requests, pmi disabled\n");
 601                                 par->ypan = par->pmi_setpal = 0;
 602                         }
 603                 }
 604         }
 605         return 0;
 606 }
 607 #endif /* CONFIG_X86_32 */
 608
 609 /*
 610  * Check whether a video mode is supported by the Video BIOS and is
 611  * compatible with the monitor limits.
 612  */
 613 static int __devinit uvesafb_is_valid_mode(struct fb_videomode *mode,
 614                 struct fb_info *info)
 615 {
 616         if (info->monspecs.gtf) {
 617                 fb_videomode_to_var(&info->var, mode);
 618                 if (fb_validate_mode(&info->var, info))
 619                         return 0;
 620         }
 621
 622         if (uvesafb_vbe_find_mode(info->par, mode->xres, mode->yres, 8,
 623                                 UVESAFB_EXACT_RES) == -1)
 624                 return 0;
 625
 626         return 1;
 627 }
 628
 629 static int __devinit uvesafb_vbe_getedid(struct uvesafb_ktask *task,
 630                 struct fb_info *info)
 631 {
 632         struct uvesafb_par *par = info->par;
 633         int err = 0;
 634
 635         if (noedid || par->vbe_ib.vbe_version < 0x0300)
 636                 return -EINVAL;
 637
 638         task->t.regs.eax = 0x4f15;
 639         task->t.regs.ebx = 0;
 640         task->t.regs.ecx = 0;
 641         task->t.buf_len = 0;
 642         task->t.flags = 0;
 643
 644         err = uvesafb_exec(task);
 645
 646         if ((task->t.regs.eax & 0xffff) != 0x004f || err)
 647                 return -EINVAL;
 648
 649         if ((task->t.regs.ebx & 0x3) == 3) {
 650                 printk(KERN_INFO "uvesafb: VBIOS/hardware supports both "
 651                                  "DDC1 and DDC2 transfers\n");
 652         } else if ((task->t.regs.ebx & 0x3) == 2) {
 653                 printk(KERN_INFO "uvesafb: VBIOS/hardware supports DDC2 "
 654                                  "transfers\n");
 655         } else if ((task->t.regs.ebx & 0x3) == 1) {
 656                 printk(KERN_INFO "uvesafb: VBIOS/hardware supports DDC1 "
 657                                  "transfers\n");
 658         } else {
 659                 printk(KERN_INFO "uvesafb: VBIOS/hardware doesn't support "
 660                                  "DDC transfers\n");
 661                 return -EINVAL;
 662         }
 663
 664         task->t.regs.eax = 0x4f15;
 665         task->t.regs.ebx = 1;
 666         task->t.regs.ecx = task->t.regs.edx = 0;
 667         task->t.flags = TF_BUF_RET | TF_BUF_ESDI;
 668         task->t.buf_len = EDID_LENGTH;
 669         task->buf = kzalloc(EDID_LENGTH, GFP_KERNEL);
 670
 671         err = uvesafb_exec(task);
 672
 673         if ((task->t.regs.eax & 0xffff) == 0x004f && !err) {
 674                 fb_edid_to_monspecs(task->buf, &info->monspecs);
 675
 676                 if (info->monspecs.vfmax && info->monspecs.hfmax) {
 677                         /*
 678                          * If the maximum pixel clock wasn't specified in
 679                          * the EDID block, set it to 300 MHz.
 680                          */
 681                         if (info->monspecs.dclkmax == 0)
 682                                 info->monspecs.dclkmax = 300 * 1000000;
 683                         info->monspecs.gtf = 1;
 684                 }
 685         } else {
 686                 err = -EINVAL;
 687         }
 688
 689         kfree(task->buf);
 690         return err;
 691 }
 692
 693 static void __devinit uvesafb_vbe_getmonspecs(struct uvesafb_ktask *task,
 694                 struct fb_info *info)
 695 {
 696         struct uvesafb_par *par = info->par;
 697         int i;
 698
 699         memset(&info->monspecs, 0, sizeof(info->monspecs));
 700
 701         /*
 702          * If we don't get all necessary data from the EDID block,
 703          * mark it as incompatible with the GTF and set nocrtc so
 704          * that we always use the default BIOS refresh rate.
 705          */
 706         if (uvesafb_vbe_getedid(task, info)) {
 707                 info->monspecs.gtf = 0;
 708                 par->nocrtc = 1;
 709         }
 710
 711         /* Kernel command line overrides. */
 712         if (maxclk)
 713                 info->monspecs.dclkmax = maxclk * 1000000;
 714         if (maxvf)
 715                 info->monspecs.vfmax = maxvf;
 716         if (maxhf)
 717                 info->monspecs.hfmax = maxhf * 1000;
 718
 719         /*
 720          * In case DDC transfers are not supported, the user can provide
 721          * monitor limits manually. Lower limits are set to "safe" values.
 722          */
 723         if (info->monspecs.gtf == 0 && maxclk && maxvf && maxhf) {
 724                 info->monspecs.dclkmin = 0;
 725                 info->monspecs.vfmin = 60;
 726                 info->monspecs.hfmin = 29000;
 727                 info->monspecs.gtf = 1;
 728                 par->nocrtc = 0;
 729         }
 730
 731         if (info->monspecs.gtf)
 732                 printk(KERN_INFO
 733                         "uvesafb: monitor limits: vf = %d Hz, hf = %d kHz, "
 734                         "clk = %d MHz\n", info->monspecs.vfmax,
 735                         (int)(info->monspecs.hfmax / 1000),
 736                         (int)(info->monspecs.dclkmax / 1000000));
 737         else
 738                 printk(KERN_INFO "uvesafb: no monitor limits have been set, "
 739                                  "default refresh rate will be used\n");
 740
 741         /* Add VBE modes to the modelist. */
 742         for (i = 0; i < par->vbe_modes_cnt; i++) {
 743                 struct fb_var_screeninfo var;
 744                 struct vbe_mode_ib *mode;
 745                 struct fb_videomode vmode;
 746
 747                 mode = &par->vbe_modes[i];
 748                 memset(&var, 0, sizeof(var));
 749
 750                 var.xres = mode->x_res;
 751                 var.yres = mode->y_res;
 752
 753                 fb_get_mode(FB_VSYNCTIMINGS | FB_IGNOREMON, 60, &var, info);
 754                 fb_var_to_videomode(&vmode, &var);
 755                 fb_add_videomode(&vmode, &info->modelist);
 756         }
 757
 758         /* Add valid VESA modes to our modelist. */
 759         for (i = 0; i < VESA_MODEDB_SIZE; i++) {
 760                 if (uvesafb_is_valid_mode((struct fb_videomode *)
 761                                                 &vesa_modes[i], info))
 762                         fb_add_videomode(&vesa_modes[i], &info->modelist);
 763         }
 764
 765         for (i = 0; i < info->monspecs.modedb_len; i++) {
 766                 if (uvesafb_is_valid_mode(&info->monspecs.modedb[i], info))
 767                         fb_add_videomode(&info->monspecs.modedb[i],
 768                                         &info->modelist);
 769         }
 770
 771         return;
 772 }
 773
 774 static void __devinit uvesafb_vbe_getstatesize(struct uvesafb_ktask *task,
 775                 struct uvesafb_par *par)
 776 {
 777         int err;
 778
 779         uvesafb_reset(task);
 780
 781         /*
 782          * Get the VBE state buffer size. We want all available
 783          * hardware state data (CL = 0x0f).
 784          */
 785         task->t.regs.eax = 0x4f04;
 786         task->t.regs.ecx = 0x000f;
 787         task->t.regs.edx = 0x0000;
 788         task->t.flags = 0;
 789
 790         err = uvesafb_exec(task);
 791
 792         if (err || (task->t.regs.eax & 0xffff) != 0x004f) {
 793                 printk(KERN_WARNING "uvesafb: VBE state buffer size "
 794                         "cannot be determined (eax=0x%x, err=%d)\n",
 795                         task->t.regs.eax, err);
 796                 par->vbe_state_size = 0;
 797                 return;
 798         }
 799
 800         par->vbe_state_size = 64 * (task->t.regs.ebx & 0xffff);
 801 }
 802
 803 static int __devinit uvesafb_vbe_init(struct fb_info *info)
 804 {
 805         struct uvesafb_ktask *task = NULL;
 806         struct uvesafb_par *par = info->par;
 807         int err;
 808
 809         task = uvesafb_prep();
 810         if (!task)
 811                 return -ENOMEM;
 812
 813         err = uvesafb_vbe_getinfo(task, par);
 814         if (err)
 815                 goto out;
 816
 817         err = uvesafb_vbe_getmodes(task, par);
 818         if (err)
 819                 goto out;
 820
 821         par->nocrtc = nocrtc;
 822 #ifdef CONFIG_X86_32
 823         par->pmi_setpal = pmi_setpal;
 824         par->ypan = ypan;
 825
 826         if (par->pmi_setpal || par->ypan)
 827                 uvesafb_vbe_getpmi(task, par);
 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 - info->var.green.length;
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 - info->var.green.length;
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                         /*
1321                          * We've failed to set the DAC palette format -
1322                          * time to correct var.
1323                          */
1324                         info->var.red.length    = 6;
1325                         info->var.green.length  = 6;
1326                         info->var.blue.length   = 6;
1327                 }
1328         }
1329
1330         info->fix.visual = (info->var.bits_per_pixel == 8) ?
1331                                 FB_VISUAL_PSEUDOCOLOR : FB_VISUAL_TRUECOLOR;
1332         info->fix.line_length = mode->bytes_per_scan_line;
1333
1334 out:    if (crtc != NULL)
1335                 kfree(crtc);
1336         uvesafb_free(task);
1337
1338         return err;
1339 }
1340
1341 static void uvesafb_check_limits(struct fb_var_screeninfo *var,
1342                 struct fb_info *info)
1343 {
1344         const struct fb_videomode *mode;
1345         struct uvesafb_par *par = info->par;
1346
1347         /*
1348          * If pixclock is set to 0, then we're using default BIOS timings
1349          * and thus don't have to perform any checks here.
1350          */
1351         if (!var->pixclock)
1352                 return;
1353
1354         if (par->vbe_ib.vbe_version < 0x0300) {
1355                 fb_get_mode(FB_VSYNCTIMINGS | FB_IGNOREMON, 60, var, info);
1356                 return;
1357         }
1358
1359         if (!fb_validate_mode(var, info))
1360                 return;
1361
1362         mode = fb_find_best_mode(var, &info->modelist);
1363         if (mode) {
1364                 if (mode->xres == var->xres && mode->yres == var->yres &&
1365                     !(mode->vmode & (FB_VMODE_INTERLACED | FB_VMODE_DOUBLE))) {
1366                         fb_videomode_to_var(var, mode);
1367                         return;
1368                 }
1369         }
1370
1371         if (info->monspecs.gtf && !fb_get_mode(FB_MAXTIMINGS, 0, var, info))
1372                 return;
1373         /* Use default refresh rate */
1374         var->pixclock = 0;
1375 }
1376
1377 static int uvesafb_check_var(struct fb_var_screeninfo *var,
1378                 struct fb_info *info)
1379 {
1380         struct uvesafb_par *par = info->par;
1381         struct vbe_mode_ib *mode = NULL;
1382         int match = -1;
1383         int depth = var->red.length + var->green.length + var->blue.length;
1384
1385         /*
1386          * Various apps will use bits_per_pixel to set the color depth,
1387          * which is theoretically incorrect, but which we'll try to handle
1388          * here.
1389          */
1390         if (depth == 0 || abs(depth - var->bits_per_pixel) >= 8)
1391                 depth = var->bits_per_pixel;
1392
1393         match = uvesafb_vbe_find_mode(par, var->xres, var->yres, depth,
1394                                                 UVESAFB_EXACT_RES);
1395         if (match == -1)
1396                 return -EINVAL;
1397
1398         mode = &par->vbe_modes[match];
1399         uvesafb_setup_var(var, info, mode);
1400
1401         /*
1402          * Check whether we have remapped enough memory for this mode.
1403          * We might be called at an early stage, when we haven't remapped
1404          * any memory yet, in which case we simply skip the check.
1405          */
1406         if (var->yres * mode->bytes_per_scan_line > info->fix.smem_len
1407                                                 && info->fix.smem_len)
1408                 return -EINVAL;
1409
1410         if ((var->vmode & FB_VMODE_DOUBLE) &&
1411                                 !(par->vbe_modes[match].mode_attr & 0x100))
1412                 var->vmode &= ~FB_VMODE_DOUBLE;
1413
1414         if ((var->vmode & FB_VMODE_INTERLACED) &&
1415                                 !(par->vbe_modes[match].mode_attr & 0x200))
1416                 var->vmode &= ~FB_VMODE_INTERLACED;
1417
1418         uvesafb_check_limits(var, info);
1419
1420         var->xres_virtual = var->xres;
1421         var->yres_virtual = (par->ypan) ?
1422                                 info->fix.smem_len / mode->bytes_per_scan_line :
1423                                 var->yres;
1424         return 0;
1425 }
1426
1427 static void uvesafb_save_state(struct fb_info *info)
1428 {
1429         struct uvesafb_par *par = info->par;
1430
1431         if (par->vbe_state_saved)
1432                 kfree(par->vbe_state_saved);
1433
1434         par->vbe_state_saved = uvesafb_vbe_state_save(par);
1435 }
1436
1437 static void uvesafb_restore_state(struct fb_info *info)
1438 {
1439         struct uvesafb_par *par = info->par;
1440
1441         uvesafb_vbe_state_restore(par, par->vbe_state_saved);
1442 }
1443
1444 static struct fb_ops uvesafb_ops = {
1445         .owner          = THIS_MODULE,
1446         .fb_open        = uvesafb_open,
1447         .fb_release     = uvesafb_release,
1448         .fb_setcolreg   = uvesafb_setcolreg,
1449         .fb_setcmap     = uvesafb_setcmap,
1450         .fb_pan_display = uvesafb_pan_display,
1451         .fb_blank       = uvesafb_blank,
1452         .fb_fillrect    = cfb_fillrect,
1453         .fb_copyarea    = cfb_copyarea,
1454         .fb_imageblit   = cfb_imageblit,
1455         .fb_check_var   = uvesafb_check_var,
1456         .fb_set_par     = uvesafb_set_par,
1457         .fb_save_state  = uvesafb_save_state,
1458         .fb_restore_state = uvesafb_restore_state,
1459 };
1460
1461 static void __devinit uvesafb_init_info(struct fb_info *info,
1462                 struct vbe_mode_ib *mode)
1463 {
1464         unsigned int size_vmode;
1465         unsigned int size_remap;
1466         unsigned int size_total;
1467         struct uvesafb_par *par = info->par;
1468         int i, h;
1469
1470         info->pseudo_palette = ((u8 *)info->par + sizeof(struct uvesafb_par));
1471         info->fix = uvesafb_fix;
1472         info->fix.ypanstep = par->ypan ? 1 : 0;
1473         info->fix.ywrapstep = (par->ypan > 1) ? 1 : 0;
1474
1475         /*
1476          * If we were unable to get the state buffer size, disable
1477          * functions for saving and restoring the hardware state.
1478          */
1479         if (par->vbe_state_size == 0) {
1480                 info->fbops->fb_save_state = NULL;
1481                 info->fbops->fb_restore_state = NULL;
1482         }
1483
1484         /* Disable blanking if the user requested so. */
1485         if (!blank)
1486                 info->fbops->fb_blank = NULL;
1487
1488         /*
1489          * Find out how much IO memory is required for the mode with
1490          * the highest resolution.
1491          */
1492         size_remap = 0;
1493         for (i = 0; i < par->vbe_modes_cnt; i++) {
1494                 h = par->vbe_modes[i].bytes_per_scan_line *
1495                                         par->vbe_modes[i].y_res;
1496                 if (h > size_remap)
1497                         size_remap = h;
1498         }
1499         size_remap *= 2;
1500
1501         /*
1502          *   size_vmode -- that is the amount of memory needed for the
1503          *                 used video mode, i.e. the minimum amount of
1504          *                 memory we need.
1505          */
1506         if (mode != NULL) {
1507                 size_vmode = info->var.yres * mode->bytes_per_scan_line;
1508         } else {
1509                 size_vmode = info->var.yres * info->var.xres *
1510                              ((info->var.bits_per_pixel + 7) >> 3);
1511         }
1512
1513         /*
1514          *   size_total -- all video memory we have. Used for mtrr
1515          *                 entries, resource allocation and bounds
1516          *                 checking.
1517          */
1518         size_total = par->vbe_ib.total_memory * 65536;
1519         if (vram_total)
1520                 size_total = vram_total * 1024 * 1024;
1521         if (size_total < size_vmode)
1522                 size_total = size_vmode;
1523
1524         /*
1525          *   size_remap -- the amount of video memory we are going to
1526          *                 use for vesafb.  With modern cards it is no
1527          *                 option to simply use size_total as th
1528          *                 wastes plenty of kernel address space.
1529          */
1530         if (vram_remap)
1531                 size_remap = vram_remap * 1024 * 1024;
1532         if (size_remap < size_vmode)
1533                 size_remap = size_vmode;
1534         if (size_remap > size_total)
1535                 size_remap = size_total;
1536
1537         info->fix.smem_len = size_remap;
1538         info->fix.smem_start = mode->phys_base_ptr;
1539
1540         /*
1541          * We have to set yres_virtual here because when setup_var() was
1542          * called, smem_len wasn't defined yet.
1543          */
1544         info->var.yres_virtual = info->fix.smem_len /
1545                                  mode->bytes_per_scan_line;
1546
1547         if (par->ypan && info->var.yres_virtual > info->var.yres) {
1548                 printk(KERN_INFO "uvesafb: scrolling: %s "
1549                         "using protected mode interface, "
1550                         "yres_virtual=%d\n",
1551                         (par->ypan > 1) ? "ywrap" : "ypan",
1552                         info->var.yres_virtual);
1553         } else {
1554                 printk(KERN_INFO "uvesafb: scrolling: redraw\n");
1555                 info->var.yres_virtual = info->var.yres;
1556                 par->ypan = 0;
1557         }
1558
1559         info->flags = FBINFO_FLAG_DEFAULT |
1560                         (par->ypan ? FBINFO_HWACCEL_YPAN : 0);
1561
1562         if (!par->ypan)
1563                 info->fbops->fb_pan_display = NULL;
1564 }
1565
1566 static void __devinit uvesafb_init_mtrr(struct fb_info *info)
1567 {
1568 #ifdef CONFIG_MTRR
1569         if (mtrr && !(info->fix.smem_start & (PAGE_SIZE - 1))) {
1570                 int temp_size = info->fix.smem_len;
1571                 unsigned int type = 0;
1572
1573                 switch (mtrr) {
1574                 case 1:
1575                         type = MTRR_TYPE_UNCACHABLE;
1576                         break;
1577                 case 2:
1578                         type = MTRR_TYPE_WRBACK;
1579                         break;
1580                 case 3:
1581                         type = MTRR_TYPE_WRCOMB;
1582                         break;
1583                 case 4:
1584                         type = MTRR_TYPE_WRTHROUGH;
1585                         break;
1586                 default:
1587                         type = 0;
1588                         break;
1589                 }
1590
1591                 if (type) {
1592                         int rc;
1593
1594                         /* Find the largest power-of-two */
1595                         while (temp_size & (temp_size - 1))
1596                                 temp_size &= (temp_size - 1);
1597
1598                         /* Try and find a power of two to add */
1599                         do {
1600                                 rc = mtrr_add(info->fix.smem_start,
1601                                               temp_size, type, 1);
1602                                 temp_size >>= 1;
1603                         } while (temp_size >= PAGE_SIZE && rc == -EINVAL);
1604                 }
1605         }
1606 #endif /* CONFIG_MTRR */
1607 }
1608
1609
1610 static ssize_t uvesafb_show_vbe_ver(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
1616         return snprintf(buf, PAGE_SIZE, "%.4x\n", par->vbe_ib.vbe_version);
1617 }
1618
1619 static DEVICE_ATTR(vbe_version, S_IRUGO, uvesafb_show_vbe_ver, NULL);
1620
1621 static ssize_t uvesafb_show_vbe_modes(struct device *dev,
1622                 struct device_attribute *attr, char *buf)
1623 {
1624         struct fb_info *info = platform_get_drvdata(to_platform_device(dev));
1625         struct uvesafb_par *par = info->par;
1626         int ret = 0, i;
1627
1628         for (i = 0; i < par->vbe_modes_cnt && ret < PAGE_SIZE; i++) {
1629                 ret += snprintf(buf + ret, PAGE_SIZE - ret,
1630                         "%dx%d-%d, 0x%.4x\n",
1631                         par->vbe_modes[i].x_res, par->vbe_modes[i].y_res,
1632                         par->vbe_modes[i].depth, par->vbe_modes[i].mode_id);
1633         }
1634
1635         return ret;
1636 }
1637
1638 static DEVICE_ATTR(vbe_modes, S_IRUGO, uvesafb_show_vbe_modes, NULL);
1639
1640 static ssize_t uvesafb_show_vendor(struct device *dev,
1641                 struct device_attribute *attr, char *buf)
1642 {
1643         struct fb_info *info = platform_get_drvdata(to_platform_device(dev));
1644         struct uvesafb_par *par = info->par;
1645
1646         if (par->vbe_ib.oem_vendor_name_ptr)
1647                 return snprintf(buf, PAGE_SIZE, "%s\n", (char *)
1648                         (&par->vbe_ib) + par->vbe_ib.oem_vendor_name_ptr);
1649         else
1650                 return 0;
1651 }
1652
1653 static DEVICE_ATTR(oem_vendor, S_IRUGO, uvesafb_show_vendor, NULL);
1654
1655 static ssize_t uvesafb_show_product_name(struct device *dev,
1656                 struct device_attribute *attr, char *buf)
1657 {
1658         struct fb_info *info = platform_get_drvdata(to_platform_device(dev));
1659         struct uvesafb_par *par = info->par;
1660
1661         if (par->vbe_ib.oem_product_name_ptr)
1662                 return snprintf(buf, PAGE_SIZE, "%s\n", (char *)
1663                         (&par->vbe_ib) + par->vbe_ib.oem_product_name_ptr);
1664         else
1665                 return 0;
1666 }
1667
1668 static DEVICE_ATTR(oem_product_name, S_IRUGO, uvesafb_show_product_name, NULL);
1669
1670 static ssize_t uvesafb_show_product_rev(struct device *dev,
1671                 struct device_attribute *attr, char *buf)
1672 {
1673         struct fb_info *info = platform_get_drvdata(to_platform_device(dev));
1674         struct uvesafb_par *par = info->par;
1675
1676         if (par->vbe_ib.oem_product_rev_ptr)
1677                 return snprintf(buf, PAGE_SIZE, "%s\n", (char *)
1678                         (&par->vbe_ib) + par->vbe_ib.oem_product_rev_ptr);
1679         else
1680                 return 0;
1681 }
1682
1683 static DEVICE_ATTR(oem_product_rev, S_IRUGO, uvesafb_show_product_rev, NULL);
1684
1685 static ssize_t uvesafb_show_oem_string(struct device *dev,
1686                 struct device_attribute *attr, char *buf)
1687 {
1688         struct fb_info *info = platform_get_drvdata(to_platform_device(dev));
1689         struct uvesafb_par *par = info->par;
1690
1691         if (par->vbe_ib.oem_string_ptr)
1692                 return snprintf(buf, PAGE_SIZE, "%s\n",
1693                         (char *)(&par->vbe_ib) + par->vbe_ib.oem_string_ptr);
1694         else
1695                 return 0;
1696 }
1697
1698 static DEVICE_ATTR(oem_string, S_IRUGO, uvesafb_show_oem_string, NULL);
1699
1700 static ssize_t uvesafb_show_nocrtc(struct device *dev,
1701                 struct device_attribute *attr, char *buf)
1702 {
1703         struct fb_info *info = platform_get_drvdata(to_platform_device(dev));
1704         struct uvesafb_par *par = info->par;
1705
1706         return snprintf(buf, PAGE_SIZE, "%d\n", par->nocrtc);
1707 }
1708
1709 static ssize_t uvesafb_store_nocrtc(struct device *dev,
1710                 struct device_attribute *attr, const char *buf, size_t count)
1711 {
1712         struct fb_info *info = platform_get_drvdata(to_platform_device(dev));
1713         struct uvesafb_par *par = info->par;
1714
1715         if (count > 0) {
1716                 if (buf[0] == '0')
1717                         par->nocrtc = 0;
1718                 else
1719                         par->nocrtc = 1;
1720         }
1721         return count;
1722 }
1723
1724 static DEVICE_ATTR(nocrtc, S_IRUGO | S_IWUSR, uvesafb_show_nocrtc,
1725                         uvesafb_store_nocrtc);
1726
1727 static struct attribute *uvesafb_dev_attrs[] = {
1728         &dev_attr_vbe_version.attr,
1729         &dev_attr_vbe_modes.attr,
1730         &dev_attr_oem_vendor.attr,
1731         &dev_attr_oem_product_name.attr,
1732         &dev_attr_oem_product_rev.attr,
1733         &dev_attr_oem_string.attr,
1734         &dev_attr_nocrtc.attr,
1735         NULL,
1736 };
1737
1738 static struct attribute_group uvesafb_dev_attgrp = {
1739         .name = NULL,
1740         .attrs = uvesafb_dev_attrs,
1741 };
1742
1743 static int __devinit uvesafb_probe(struct platform_device *dev)
1744 {
1745         struct fb_info *info;
1746         struct vbe_mode_ib *mode = NULL;
1747         struct uvesafb_par *par;
1748         int err = 0, i;
1749
1750         info = framebuffer_alloc(sizeof(*par) + sizeof(u32) * 256, &dev->dev);
1751         if (!info)
1752                 return -ENOMEM;
1753
1754         par = info->par;
1755
1756         err = uvesafb_vbe_init(info);
1757         if (err) {
1758                 printk(KERN_ERR "uvesafb: vbe_init() failed with %d\n", err);
1759                 goto out;
1760         }
1761
1762         info->fbops = &uvesafb_ops;
1763
1764         i = uvesafb_vbe_init_mode(info);
1765         if (i < 0) {
1766                 err = -EINVAL;
1767                 goto out;
1768         } else {
1769                 mode = &par->vbe_modes[i];
1770         }
1771
1772         if (fb_alloc_cmap(&info->cmap, 256, 0) < 0) {
1773                 err = -ENXIO;
1774                 goto out;
1775         }
1776
1777         uvesafb_init_info(info, mode);
1778
1779         if (!request_mem_region(info->fix.smem_start, info->fix.smem_len,
1780                                 "uvesafb")) {
1781                 printk(KERN_ERR "uvesafb: cannot reserve video memory at "
1782                                 "0x%lx\n", info->fix.smem_start);
1783                 err = -EIO;
1784                 goto out_mode;
1785         }
1786
1787         info->screen_base = ioremap(info->fix.smem_start, info->fix.smem_len);
1788
1789         if (!info->screen_base) {
1790                 printk(KERN_ERR
1791                         "uvesafb: abort, cannot ioremap 0x%x bytes of video "
1792                         "memory at 0x%lx\n",
1793                         info->fix.smem_len, info->fix.smem_start);
1794                 err = -EIO;
1795                 goto out_mem;
1796         }
1797
1798         if (!request_region(0x3c0, 32, "uvesafb")) {
1799                 printk(KERN_ERR "uvesafb: request region 0x3c0-0x3e0 failed\n");
1800                 err = -EIO;
1801                 goto out_unmap;
1802         }
1803
1804         uvesafb_init_mtrr(info);
1805         platform_set_drvdata(dev, info);
1806
1807         if (register_framebuffer(info) < 0) {
1808                 printk(KERN_ERR
1809                         "uvesafb: failed to register framebuffer device\n");
1810                 err = -EINVAL;
1811                 goto out_reg;
1812         }
1813
1814         printk(KERN_INFO "uvesafb: framebuffer at 0x%lx, mapped to 0x%p, "
1815                         "using %dk, total %dk\n", info->fix.smem_start,
1816                         info->screen_base, info->fix.smem_len/1024,
1817                         par->vbe_ib.total_memory * 64);
1818         printk(KERN_INFO "fb%d: %s frame buffer device\n", info->node,
1819                         info->fix.id);
1820
1821         err = sysfs_create_group(&dev->dev.kobj, &uvesafb_dev_attgrp);
1822         if (err != 0)
1823                 printk(KERN_WARNING "fb%d: failed to register attributes\n",
1824                         info->node);
1825
1826         return 0;
1827
1828 out_reg:
1829         release_region(0x3c0, 32);
1830 out_unmap:
1831         iounmap(info->screen_base);
1832 out_mem:
1833         release_mem_region(info->fix.smem_start, info->fix.smem_len);
1834 out_mode:
1835         if (!list_empty(&info->modelist))
1836                 fb_destroy_modelist(&info->modelist);
1837         fb_destroy_modedb(info->monspecs.modedb);
1838         fb_dealloc_cmap(&info->cmap);
1839 out:
1840         if (par->vbe_modes)
1841                 kfree(par->vbe_modes);
1842
1843         framebuffer_release(info);
1844         return err;
1845 }
1846
1847 static int uvesafb_remove(struct platform_device *dev)
1848 {
1849         struct fb_info *info = platform_get_drvdata(dev);
1850
1851         if (info) {
1852                 struct uvesafb_par *par = info->par;
1853
1854                 sysfs_remove_group(&dev->dev.kobj, &uvesafb_dev_attgrp);
1855                 unregister_framebuffer(info);
1856                 release_region(0x3c0, 32);
1857                 iounmap(info->screen_base);
1858                 release_mem_region(info->fix.smem_start, info->fix.smem_len);
1859                 fb_destroy_modedb(info->monspecs.modedb);
1860                 fb_dealloc_cmap(&info->cmap);
1861
1862                 if (par) {
1863                         if (par->vbe_modes)
1864                                 kfree(par->vbe_modes);
1865                         if (par->vbe_state_orig)
1866                                 kfree(par->vbe_state_orig);
1867                         if (par->vbe_state_saved)
1868                                 kfree(par->vbe_state_saved);
1869                 }
1870
1871                 framebuffer_release(info);
1872         }
1873         return 0;
1874 }
1875
1876 static struct platform_driver uvesafb_driver = {
1877         .probe  = uvesafb_probe,
1878         .remove = uvesafb_remove,
1879         .driver = {
1880                 .name = "uvesafb",
1881         },
1882 };
1883
1884 static struct platform_device *uvesafb_device;
1885
1886 #ifndef MODULE
1887 static int __devinit uvesafb_setup(char *options)
1888 {
1889         char *this_opt;
1890
1891         if (!options || !*options)
1892                 return 0;
1893
1894         while ((this_opt = strsep(&options, ",")) != NULL) {
1895                 if (!*this_opt) continue;
1896
1897                 if (!strcmp(this_opt, "redraw"))
1898                         ypan = 0;
1899                 else if (!strcmp(this_opt, "ypan"))
1900                         ypan = 1;
1901                 else if (!strcmp(this_opt, "ywrap"))
1902                         ypan = 2;
1903                 else if (!strcmp(this_opt, "vgapal"))
1904                         pmi_setpal = 0;
1905                 else if (!strcmp(this_opt, "pmipal"))
1906                         pmi_setpal = 1;
1907                 else if (!strncmp(this_opt, "mtrr:", 5))
1908                         mtrr = simple_strtoul(this_opt+5, NULL, 0);
1909                 else if (!strcmp(this_opt, "nomtrr"))
1910                         mtrr = 0;
1911                 else if (!strcmp(this_opt, "nocrtc"))
1912                         nocrtc = 1;
1913                 else if (!strcmp(this_opt, "noedid"))
1914                         noedid = 1;
1915                 else if (!strcmp(this_opt, "noblank"))
1916                         blank = 0;
1917                 else if (!strncmp(this_opt, "vtotal:", 7))
1918                         vram_total = simple_strtoul(this_opt + 7, NULL, 0);
1919                 else if (!strncmp(this_opt, "vremap:", 7))
1920                         vram_remap = simple_strtoul(this_opt + 7, NULL, 0);
1921                 else if (!strncmp(this_opt, "maxhf:", 6))
1922                         maxhf = simple_strtoul(this_opt + 6, NULL, 0);
1923                 else if (!strncmp(this_opt, "maxvf:", 6))
1924                         maxvf = simple_strtoul(this_opt + 6, NULL, 0);
1925                 else if (!strncmp(this_opt, "maxclk:", 7))
1926                         maxclk = simple_strtoul(this_opt + 7, NULL, 0);
1927                 else if (!strncmp(this_opt, "vbemode:", 8))
1928                         vbemode = simple_strtoul(this_opt + 8, NULL, 0);
1929                 else if (this_opt[0] >= '0' && this_opt[0] <= '9') {
1930                         mode_option = this_opt;
1931                 } else {
1932                         printk(KERN_WARNING
1933                                 "uvesafb: unrecognized option %s\n", this_opt);
1934                 }
1935         }
1936
1937         return 0;
1938 }
1939 #endif /* !MODULE */
1940
1941 static ssize_t show_v86d(struct device_driver *dev, char *buf)
1942 {
1943         return snprintf(buf, PAGE_SIZE, "%s\n", v86d_path);
1944 }
1945
1946 static ssize_t store_v86d(struct device_driver *dev, const char *buf,
1947                 size_t count)
1948 {
1949         strncpy(v86d_path, buf, PATH_MAX);
1950         return count;
1951 }
1952
1953 static DRIVER_ATTR(v86d, S_IRUGO | S_IWUSR, show_v86d, store_v86d);
1954
1955 static int __devinit uvesafb_init(void)
1956 {
1957         int err;
1958
1959 #ifndef MODULE
1960         char *option = NULL;
1961
1962         if (fb_get_options("uvesafb", &option))
1963                 return -ENODEV;
1964         uvesafb_setup(option);
1965 #endif
1966         err = cn_add_callback(&uvesafb_cn_id, "uvesafb", uvesafb_cn_callback);
1967         if (err)
1968                 return err;
1969
1970         err = platform_driver_register(&uvesafb_driver);
1971
1972         if (!err) {
1973                 uvesafb_device = platform_device_alloc("uvesafb", 0);
1974                 if (uvesafb_device)
1975                         err = platform_device_add(uvesafb_device);
1976                 else
1977                         err = -ENOMEM;
1978
1979                 if (err) {
1980                         platform_device_put(uvesafb_device);
1981                         platform_driver_unregister(&uvesafb_driver);
1982                         cn_del_callback(&uvesafb_cn_id);
1983                         return err;
1984                 }
1985
1986                 err = driver_create_file(&uvesafb_driver.driver,
1987                                 &driver_attr_v86d);
1988                 if (err) {
1989                         printk(KERN_WARNING "uvesafb: failed to register "
1990                                         "attributes\n");
1991                         err = 0;
1992                 }
1993         }
1994         return err;
1995 }
1996
1997 module_init(uvesafb_init);
1998
1999 static void __devexit uvesafb_exit(void)
2000 {
2001         struct uvesafb_ktask *task;
2002
2003         if (v86d_started) {
2004                 task = uvesafb_prep();
2005                 if (task) {
2006                         task->t.flags = TF_EXIT;
2007                         uvesafb_exec(task);
2008                         uvesafb_free(task);
2009                 }
2010         }
2011
2012         cn_del_callback(&uvesafb_cn_id);
2013         driver_remove_file(&uvesafb_driver.driver, &driver_attr_v86d);
2014         platform_device_unregister(uvesafb_device);
2015         platform_driver_unregister(&uvesafb_driver);
2016 }
2017
2018 module_exit(uvesafb_exit);
2019
2020 static int param_get_scroll(char *buffer, struct kernel_param *kp)
2021 {
2022         return 0;
2023 }
2024
2025 static int param_set_scroll(const char *val, struct kernel_param *kp)
2026 {
2027         ypan = 0;
2028
2029         if (!strcmp(val, "redraw"))
2030                 ypan = 0;
2031         else if (!strcmp(val, "ypan"))
2032                 ypan = 1;
2033         else if (!strcmp(val, "ywrap"))
2034                 ypan = 2;
2035
2036         return 0;
2037 }
2038
2039 #define param_check_scroll(name, p) __param_check(name, p, void)
2040
2041 module_param_named(scroll, ypan, scroll, 0);
2042 MODULE_PARM_DESC(scroll,
2043         "Scrolling mode, set to 'redraw', 'ypan', or 'ywrap'");
2044 module_param_named(vgapal, pmi_setpal, invbool, 0);
2045 MODULE_PARM_DESC(vgapal, "Set palette using VGA registers");
2046 module_param_named(pmipal, pmi_setpal, bool, 0);
2047 MODULE_PARM_DESC(pmipal, "Set palette using PMI calls");
2048 module_param(mtrr, uint, 0);
2049 MODULE_PARM_DESC(mtrr,
2050         "Memory Type Range Registers setting. Use 0 to disable.");
2051 module_param(blank, bool, 0);
2052 MODULE_PARM_DESC(blank, "Enable hardware blanking");
2053 module_param(nocrtc, bool, 0);
2054 MODULE_PARM_DESC(nocrtc, "Ignore CRTC timings when setting modes");
2055 module_param(noedid, bool, 0);
2056 MODULE_PARM_DESC(noedid,
2057         "Ignore EDID-provided monitor limits when setting modes");
2058 module_param(vram_remap, uint, 0);
2059 MODULE_PARM_DESC(vram_remap, "Set amount of video memory to be used [MiB]");
2060 module_param(vram_total, uint, 0);
2061 MODULE_PARM_DESC(vram_total, "Set total amount of video memoery [MiB]");
2062 module_param(maxclk, ushort, 0);
2063 MODULE_PARM_DESC(maxclk, "Maximum pixelclock [MHz], overrides EDID data");
2064 module_param(maxhf, ushort, 0);
2065 MODULE_PARM_DESC(maxhf,
2066         "Maximum horizontal frequency [kHz], overrides EDID data");
2067 module_param(maxvf, ushort, 0);
2068 MODULE_PARM_DESC(maxvf,
2069         "Maximum vertical frequency [Hz], overrides EDID data");
2070 module_param(mode_option, charp, 0);
2071 MODULE_PARM_DESC(mode_option,
2072         "Specify initial video mode as \"<xres>x<yres>[-<bpp>][@<refresh>]\"");
2073 module_param(vbemode, ushort, 0);
2074 MODULE_PARM_DESC(vbemode,
2075         "VBE mode number to set, overrides the 'mode' option");
2076 module_param_string(v86d, v86d_path, PATH_MAX, 0660);
2077 MODULE_PARM_DESC(v86d, "Path to the v86d userspace helper.");
2078
2079 MODULE_LICENSE("GPL");
2080 MODULE_AUTHOR("Michal Januszewski <spock@gentoo.org>");
2081 MODULE_DESCRIPTION("Framebuffer driver for VBE2.0+ compliant graphics boards");
2082