git.oblomov.eu Git - linux-2.6/blob - drivers/video/uvesafb.c

   1 /*
   2  * A framebuffer driver for VBE 2.0+ compliant video cards
   3  *
   4  * (c) 2007 Michal Januszewski <spock@gentoo.org>
   5  *     Loosely based upon the vesafb driver.
   6  *
   7  */
   8 #include <linux/init.h>
   9 #include <linux/module.h>
  10 #include <linux/moduleparam.h>
  11 #include <linux/skbuff.h>
  12 #include <linux/timer.h>
  13 #include <linux/completion.h>
  14 #include <linux/connector.h>
  15 #include <linux/random.h>
  16 #include <linux/platform_device.h>
  17 #include <linux/limits.h>
  18 #include <linux/fb.h>
  19 #include <linux/io.h>
  20 #include <linux/mutex.h>
  21 #include <video/edid.h>
  22 #include <video/uvesafb.h>
  23 #ifdef CONFIG_X86
  24 #include <video/vga.h>
  25 #endif
  26 #ifdef CONFIG_MTRR
  27 #include <asm/mtrr.h>
  28 #endif
  29 #include "edid.h"
  30
  31 static struct cb_id uvesafb_cn_id = {
  32         .idx = CN_IDX_V86D,
  33         .val = CN_VAL_V86D_UVESAFB
  34 };
  35 static char v86d_path[PATH_MAX] = "/sbin/v86d";
  36 static char v86d_started;       /* has v86d been started by uvesafb? */
  37
  38 static struct fb_fix_screeninfo uvesafb_fix __devinitdata = {
  39         .id     = "VESA VGA",
  40         .type   = FB_TYPE_PACKED_PIXELS,
  41         .accel  = FB_ACCEL_NONE,
  42         .visual = FB_VISUAL_TRUECOLOR,
  43 };
  44
  45 static int mtrr         __devinitdata = 3; /* enable mtrr by default */
  46 static int blank        = 1;               /* enable blanking by default */
  47 static int ypan         = 1;             /* 0: scroll, 1: ypan, 2: ywrap */
  48 static bool pmi_setpal  __devinitdata = true; /* use PMI for palette changes */
  49 static int nocrtc       __devinitdata; /* ignore CRTC settings */
  50 static int noedid       __devinitdata; /* don't try DDC transfers */
  51 static int vram_remap   __devinitdata; /* set amt. of memory to be used */
  52 static int vram_total   __devinitdata; /* set total amount of memory */
  53 static u16 maxclk       __devinitdata; /* maximum pixel clock */
  54 static u16 maxvf        __devinitdata; /* maximum vertical frequency */
  55 static u16 maxhf        __devinitdata; /* maximum horizontal frequency */
  56 static u16 vbemode      __devinitdata; /* force use of a specific VBE mode */
  57 static char *mode_option __devinitdata;
  58 static u8  dac_width    = 6;
  59
  60 static struct uvesafb_ktask *uvfb_tasks[UVESAFB_TASKS_MAX];
  61 static DEFINE_MUTEX(uvfb_lock);
  62
  63 /*
  64  * A handler for replies from userspace.
  65  *
  66  * Make sure each message passes consistency checks and if it does,
  67  * find the kernel part of the task struct, copy the registers and
  68  * the buffer contents and then complete the task.
  69  */
  70 static void uvesafb_cn_callback(void *data)
  71 {
  72         struct cn_msg *msg = data;
  73         struct uvesafb_task *utask;
  74         struct uvesafb_ktask *task;
  75
  76         if (msg->seq >= UVESAFB_TASKS_MAX)
  77                 return;
  78
  79         mutex_lock(&uvfb_lock);
  80         task = uvfb_tasks[msg->seq];
  81
  82         if (!task || msg->ack != task->ack) {
  83                 mutex_unlock(&uvfb_lock);
  84                 return;
  85         }
  86
  87         utask = (struct uvesafb_task *)msg->data;
  88
  89         /* Sanity checks for the buffer length. */
  90         if (task->t.buf_len < utask->buf_len ||
  91             utask->buf_len > msg->len - sizeof(*utask)) {
  92                 mutex_unlock(&uvfb_lock);
  93                 return;
  94         }
  95
  96         uvfb_tasks[msg->seq] = NULL;
  97         mutex_unlock(&uvfb_lock);
  98
  99         memcpy(&task->t, utask, sizeof(*utask));
 100
 101         if (task->t.buf_len && task->buf)
 102                 memcpy(task->buf, utask + 1, task->t.buf_len);
 103
 104         complete(task->done);
 105         return;
 106 }
 107
 108 static int uvesafb_helper_start(void)
 109 {
 110         char *envp[] = {
 111                 "HOME=/",
 112                 "PATH=/sbin:/bin",
 113                 NULL,
 114         };
 115
 116         char *argv[] = {
 117                 v86d_path,
 118                 NULL,
 119         };
 120
 121         return call_usermodehelper(v86d_path, argv, envp, 1);
 122 }
 123
 124 /*
 125  * Execute a uvesafb task.
 126  *
 127  * Returns 0 if the task is executed successfully.
 128  *
 129  * A message sent to the userspace consists of the uvesafb_task
 130  * struct and (optionally) a buffer. The uvesafb_task struct is
 131  * a simplified version of uvesafb_ktask (its kernel counterpart)
 132  * containing only the register values, flags and the length of
 133  * the buffer.
 134  *
 135  * Each message is assigned a sequence number (increased linearly)
 136  * and a random ack number. The sequence number is used as a key
 137  * for the uvfb_tasks array which holds pointers to uvesafb_ktask
 138  * structs for all requests.
 139  */
 140 static int uvesafb_exec(struct uvesafb_ktask *task)
 141 {
 142         static int seq;
 143         struct cn_msg *m;
 144         int err;
 145         int len = sizeof(task->t) + task->t.buf_len;
 146
 147         /*
 148          * Check whether the message isn't longer than the maximum
 149          * allowed by connector.
 150          */
 151         if (sizeof(*m) + len > CONNECTOR_MAX_MSG_SIZE) {
 152                 printk(KERN_WARNING "uvesafb: message too long (%d), "
 153                         "can't execute task\n", (int)(sizeof(*m) + len));
 154                 return -E2BIG;
 155         }
 156
 157         m = kzalloc(sizeof(*m) + len, GFP_KERNEL);
 158         if (!m)
 159                 return -ENOMEM;
 160
 161         init_completion(task->done);
 162
 163         memcpy(&m->id, &uvesafb_cn_id, sizeof(m->id));
 164         m->seq = seq;
 165         m->len = len;
 166         m->ack = random32();
 167
 168         /* uvesafb_task structure */
 169         memcpy(m + 1, &task->t, sizeof(task->t));
 170
 171         /* Buffer */
 172         memcpy((u8 *)(m + 1) + sizeof(task->t), task->buf, task->t.buf_len);
 173
 174         /*
 175          * Save the message ack number so that we can find the kernel
 176          * part of this task when a reply is received from userspace.
 177          */
 178         task->ack = m->ack;
 179
 180         mutex_lock(&uvfb_lock);
 181
 182         /* If all slots are taken -- bail out. */
 183         if (uvfb_tasks[seq]) {
 184                 mutex_unlock(&uvfb_lock);
 185                 err = -EBUSY;
 186                 goto out;
 187         }
 188
 189         /* Save a pointer to the kernel part of the task struct. */
 190         uvfb_tasks[seq] = task;
 191         mutex_unlock(&uvfb_lock);
 192
 193         err = cn_netlink_send(m, 0, GFP_KERNEL);
 194         if (err == -ESRCH) {
 195                 /*
 196                  * Try to start the userspace helper if sending
 197                  * the request failed the first time.
 198                  */
 199                 err = uvesafb_helper_start();
 200                 if (err) {
 201                         printk(KERN_ERR "uvesafb: failed to execute %s\n",
 202                                         v86d_path);
 203                         printk(KERN_ERR "uvesafb: make sure that the v86d "
 204                                         "helper is installed and executable\n");
 205                 } else {
 206                         v86d_started = 1;
 207                         err = cn_netlink_send(m, 0, gfp_any());
 208                         if (err == -ENOBUFS)
 209                                 err = 0;
 210                 }
 211         } else if (err == -ENOBUFS)
 212                 err = 0;
 213
 214         if (!err && !(task->t.flags & TF_EXIT))
 215                 err = !wait_for_completion_timeout(task->done,
 216                                 msecs_to_jiffies(UVESAFB_TIMEOUT));
 217
 218         mutex_lock(&uvfb_lock);
 219         uvfb_tasks[seq] = NULL;
 220         mutex_unlock(&uvfb_lock);
 221
 222         seq++;
 223         if (seq >= UVESAFB_TASKS_MAX)
 224                 seq = 0;
 225 out:
 226         kfree(m);
 227         return err;
 228 }
 229
 230 /*
 231  * Free a uvesafb_ktask struct.
 232  */
 233 static void uvesafb_free(struct uvesafb_ktask *task)
 234 {
 235         if (task) {
 236                 if (task->done)
 237                         kfree(task->done);
 238                 kfree(task);
 239         }
 240 }
 241
 242 /*
 243  * Prepare a uvesafb_ktask struct to be used again.
 244  */
 245 static void uvesafb_reset(struct uvesafb_ktask *task)
 246 {
 247         struct completion *cpl = task->done;
 248
 249         memset(task, 0, sizeof(*task));
 250         task->done = cpl;
 251 }
 252
 253 /*
 254  * Allocate and prepare a uvesafb_ktask struct.
 255  */
 256 static struct uvesafb_ktask *uvesafb_prep(void)
 257 {
 258         struct uvesafb_ktask *task;
 259
 260         task = kzalloc(sizeof(*task), GFP_KERNEL);
 261         if (task) {
 262                 task->done = kzalloc(sizeof(*task->done), GFP_KERNEL);
 263                 if (!task->done) {
 264                         kfree(task);
 265                         task = NULL;
 266                 }
 267         }
 268         return task;
 269 }
 270
 271 static void uvesafb_setup_var(struct fb_var_screeninfo *var,
 272                 struct fb_info *info, struct vbe_mode_ib *mode)
 273 {
 274         struct uvesafb_par *par = info->par;
 275
 276         var->vmode = FB_VMODE_NONINTERLACED;
 277         var->sync = FB_SYNC_VERT_HIGH_ACT;
 278
 279         var->xres = mode->x_res;
 280         var->yres = mode->y_res;
 281         var->xres_virtual = mode->x_res;
 282         var->yres_virtual = (par->ypan) ?
 283                         info->fix.smem_len / mode->bytes_per_scan_line :
 284                         mode->y_res;
 285         var->xoffset = 0;
 286         var->yoffset = 0;
 287         var->bits_per_pixel = mode->bits_per_pixel;
 288
 289         if (var->bits_per_pixel == 15)
 290                 var->bits_per_pixel = 16;
 291
 292         if (var->bits_per_pixel > 8) {
 293                 var->red.offset    = mode->red_off;
 294                 var->red.length    = mode->red_len;
 295                 var->green.offset  = mode->green_off;
 296                 var->green.length  = mode->green_len;
 297                 var->blue.offset   = mode->blue_off;
 298                 var->blue.length   = mode->blue_len;
 299                 var->transp.offset = mode->rsvd_off;
 300                 var->transp.length = mode->rsvd_len;
 301         } else {
 302                 var->red.offset    = 0;
 303                 var->green.offset  = 0;
 304                 var->blue.offset   = 0;
 305                 var->transp.offset = 0;
 306
 307                 var->red.length    = 8;
 308                 var->green.length  = 8;
 309                 var->blue.length   = 8;
 310                 var->transp.length = 0;
 311         }
 312 }
 313
 314 static int uvesafb_vbe_find_mode(struct uvesafb_par *par,
 315                 int xres, int yres, int depth, unsigned char flags)
 316 {
 317         int i, match = -1, h = 0, d = 0x7fffffff;
 318
 319         for (i = 0; i < par->vbe_modes_cnt; i++) {
 320                 h = abs(par->vbe_modes[i].x_res - xres) +
 321                     abs(par->vbe_modes[i].y_res - yres) +
 322                     abs(depth - par->vbe_modes[i].depth);
 323
 324                 /*
 325                  * We have an exact match in terms of resolution
 326                  * and depth.
 327                  */
 328                 if (h == 0)
 329                         return i;
 330
 331                 if (h < d || (h == d && par->vbe_modes[i].depth > depth)) {
 332                         d = h;
 333                         match = i;
 334                 }
 335         }
 336         i = 1;
 337
 338         if (flags & UVESAFB_EXACT_DEPTH &&
 339                         par->vbe_modes[match].depth != depth)
 340                 i = 0;
 341
 342         if (flags & UVESAFB_EXACT_RES && d > 24)
 343                 i = 0;
 344
 345         if (i != 0)
 346                 return match;
 347         else
 348                 return -1;
 349 }
 350
 351 static u8 *uvesafb_vbe_state_save(struct uvesafb_par *par)
 352 {
 353         struct uvesafb_ktask *task;
 354         u8 *state;
 355         int err;
 356
 357         if (!par->vbe_state_size)
 358                 return NULL;
 359
 360         state = kmalloc(par->vbe_state_size, GFP_KERNEL);
 361         if (!state)
 362                 return NULL;
 363
 364         task = uvesafb_prep();
 365         if (!task) {
 366                 kfree(state);
 367                 return NULL;
 368         }
 369
 370         task->t.regs.eax = 0x4f04;
 371         task->t.regs.ecx = 0x000f;
 372         task->t.regs.edx = 0x0001;
 373         task->t.flags = TF_BUF_RET | TF_BUF_ESBX;
 374         task->t.buf_len = par->vbe_state_size;
 375         task->buf = state;
 376         err = uvesafb_exec(task);
 377
 378         if (err || (task->t.regs.eax & 0xffff) != 0x004f) {
 379                 printk(KERN_WARNING "uvesafb: VBE get state call "
 380                                 "failed (eax=0x%x, err=%d)\n",
 381                                 task->t.regs.eax, err);
 382                 kfree(state);
 383                 state = NULL;
 384         }
 385
 386         uvesafb_free(task);
 387         return state;
 388 }
 389
 390 static void uvesafb_vbe_state_restore(struct uvesafb_par *par, u8 *state_buf)
 391 {
 392         struct uvesafb_ktask *task;
 393         int err;
 394
 395         if (!state_buf)
 396                 return;
 397
 398         task = uvesafb_prep();
 399         if (!task)
 400                 return;
 401
 402         task->t.regs.eax = 0x4f04;
 403         task->t.regs.ecx = 0x000f;
 404         task->t.regs.edx = 0x0002;
 405         task->t.buf_len = par->vbe_state_size;
 406         task->t.flags = TF_BUF_ESBX;
 407         task->buf = state_buf;
 408
 409         err = uvesafb_exec(task);
 410         if (err || (task->t.regs.eax & 0xffff) != 0x004f)
 411                 printk(KERN_WARNING "uvesafb: VBE state restore call "
 412                                 "failed (eax=0x%x, err=%d)\n",
 413                                 task->t.regs.eax, err);
 414
 415         uvesafb_free(task);
 416 }
 417
 418 static int __devinit uvesafb_vbe_getinfo(struct uvesafb_ktask *task,
 419                 struct uvesafb_par *par)
 420 {
 421         int err;
 422
 423         task->t.regs.eax = 0x4f00;
 424         task->t.flags = TF_VBEIB;
 425         task->t.buf_len = sizeof(struct vbe_ib);
 426         task->buf = &par->vbe_ib;
 427         strncpy(par->vbe_ib.vbe_signature, "VBE2", 4);
 428
 429         err = uvesafb_exec(task);
 430         if (err || (task->t.regs.eax & 0xffff) != 0x004f) {
 431                 printk(KERN_ERR "uvesafb: Getting VBE info block failed "
 432                                 "(eax=0x%x, err=%d)\n", (u32)task->t.regs.eax,
 433                                 err);
 434                 return -EINVAL;
 435         }
 436
 437         if (par->vbe_ib.vbe_version < 0x0200) {
 438                 printk(KERN_ERR "uvesafb: Sorry, pre-VBE 2.0 cards are "
 439                                 "not supported.\n");
 440                 return -EINVAL;
 441         }
 442
 443         if (!par->vbe_ib.mode_list_ptr) {
 444                 printk(KERN_ERR "uvesafb: Missing mode list!\n");
 445                 return -EINVAL;
 446         }
 447
 448         printk(KERN_INFO "uvesafb: ");
 449
 450         /*
 451          * Convert string pointers and the mode list pointer into
 452          * usable addresses. Print informational messages about the
 453          * video adapter and its vendor.
 454          */
 455         if (par->vbe_ib.oem_vendor_name_ptr)
 456                 printk("%s, ",
 457                         ((char *)task->buf) + par->vbe_ib.oem_vendor_name_ptr);
 458
 459         if (par->vbe_ib.oem_product_name_ptr)
 460                 printk("%s, ",
 461                         ((char *)task->buf) + par->vbe_ib.oem_product_name_ptr);
 462
 463         if (par->vbe_ib.oem_product_rev_ptr)
 464                 printk("%s, ",
 465                         ((char *)task->buf) + par->vbe_ib.oem_product_rev_ptr);
 466
 467         if (par->vbe_ib.oem_string_ptr)
 468                 printk("OEM: %s, ",
 469                         ((char *)task->buf) + par->vbe_ib.oem_string_ptr);
 470
 471         printk("VBE v%d.%d\n", ((par->vbe_ib.vbe_version & 0xff00) >> 8),
 472                         par->vbe_ib.vbe_version & 0xff);
 473
 474         return 0;
 475 }
 476
 477 static int __devinit uvesafb_vbe_getmodes(struct uvesafb_ktask *task,
 478                 struct uvesafb_par *par)
 479 {
 480         int off = 0, err;
 481         u16 *mode;
 482
 483         par->vbe_modes_cnt = 0;
 484
 485         /* Count available modes. */
 486         mode = (u16 *) (((u8 *)&par->vbe_ib) + par->vbe_ib.mode_list_ptr);
 487         while (*mode != 0xffff) {
 488                 par->vbe_modes_cnt++;
 489                 mode++;
 490         }
 491
 492         par->vbe_modes = kzalloc(sizeof(struct vbe_mode_ib) *
 493                                 par->vbe_modes_cnt, GFP_KERNEL);
 494         if (!par->vbe_modes)
 495                 return -ENOMEM;
 496
 497         /* Get info about all available modes. */
 498         mode = (u16 *) (((u8 *)&par->vbe_ib) + par->vbe_ib.mode_list_ptr);
 499         while (*mode != 0xffff) {
 500                 struct vbe_mode_ib *mib;
 501
 502                 uvesafb_reset(task);
 503                 task->t.regs.eax = 0x4f01;
 504                 task->t.regs.ecx = (u32) *mode;
 505                 task->t.flags = TF_BUF_RET | TF_BUF_ESDI;
 506                 task->t.buf_len = sizeof(struct vbe_mode_ib);
 507                 task->buf = par->vbe_modes + off;
 508
 509                 err = uvesafb_exec(task);
 510                 if (err || (task->t.regs.eax & 0xffff) != 0x004f) {
 511                         printk(KERN_WARNING "uvesafb: Getting mode info block "
 512                                 "for mode 0x%x failed (eax=0x%x, err=%d)\n",
 513                                 *mode, (u32)task->t.regs.eax, err);
 514                         mode++;
 515                         par->vbe_modes_cnt--;
 516                         continue;
 517                 }
 518
 519                 mib = task->buf;
 520                 mib->mode_id = *mode;
 521
 522                 /*
 523                  * We only want modes that are supported with the current
 524                  * hardware configuration, color, graphics and that have
 525                  * support for the LFB.
 526                  */
 527                 if ((mib->mode_attr & VBE_MODE_MASK) == VBE_MODE_MASK &&
 528                                  mib->bits_per_pixel >= 8)
 529                         off++;
 530                 else
 531                         par->vbe_modes_cnt--;
 532
 533                 mode++;
 534                 mib->depth = mib->red_len + mib->green_len + mib->blue_len;
 535
 536                 /*
 537                  * Handle 8bpp modes and modes with broken color component
 538                  * lengths.
 539                  */
 540                 if (mib->depth == 0 || (mib->depth == 24 &&
 541                                         mib->bits_per_pixel == 32))
 542                         mib->depth = mib->bits_per_pixel;
 543         }
 544
 545         if (par->vbe_modes_cnt > 0)
 546                 return 0;
 547         else
 548                 return -EINVAL;
 549 }
 550
 551 /*
 552  * The Protected Mode Interface is 32-bit x86 code, so we only run it on
 553  * x86 and not x86_64.
 554  */
 555 #ifdef CONFIG_X86_32
 556 static int __devinit uvesafb_vbe_getpmi(struct uvesafb_ktask *task,
 557                 struct uvesafb_par *par)
 558 {
 559         int i, err;
 560
 561         uvesafb_reset(task);
 562         task->t.regs.eax = 0x4f0a;
 563         task->t.regs.ebx = 0x0;
 564         err = uvesafb_exec(task);
 565
 566         if ((task->t.regs.eax & 0xffff) != 0x4f || task->t.regs.es < 0xc000) {
 567                 par->pmi_setpal = par->ypan = 0;
 568         } else {
 569                 par->pmi_base = (u16 *)phys_to_virt(((u32)task->t.regs.es << 4)
 570                                                 + task->t.regs.edi);
 571                 par->pmi_start = (u8 *)par->pmi_base + par->pmi_base[1];
 572                 par->pmi_pal = (u8 *)par->pmi_base + par->pmi_base[2];
 573                 printk(KERN_INFO "uvesafb: protected mode interface info at "
 574                                  "%04x:%04x\n",
 575                                  (u16)task->t.regs.es, (u16)task->t.regs.edi);
 576                 printk(KERN_INFO "uvesafb: pmi: set display start = %p, "
 577                                  "set palette = %p\n", par->pmi_start,
 578                                  par->pmi_pal);
 579
 580                 if (par->pmi_base[3]) {
 581                         printk(KERN_INFO "uvesafb: pmi: ports = ");
 582                         for (i = par->pmi_base[3]/2;
 583                                         par->pmi_base[i] != 0xffff; i++)
 584                                 printk("%x ", par->pmi_base[i]);
 585                         printk("\n");
 586
 587                         if (par->pmi_base[i] != 0xffff) {
 588                                 printk(KERN_INFO "uvesafb: can't handle memory"
 589                                                  " requests, pmi disabled\n");
 590                                 par->ypan = par->pmi_setpal = 0;
 591                         }
 592                 }
 593         }
 594         return 0;
 595 }
 596 #endif /* CONFIG_X86_32 */
 597
 598 /*
 599  * Check whether a video mode is supported by the Video BIOS and is
 600  * compatible with the monitor limits.
 601  */
 602 static int __devinit uvesafb_is_valid_mode(struct fb_videomode *mode,
 603                 struct fb_info *info)
 604 {
 605         if (info->monspecs.gtf) {
 606                 fb_videomode_to_var(&info->var, mode);
 607                 if (fb_validate_mode(&info->var, info))
 608                         return 0;
 609         }
 610
 611         if (uvesafb_vbe_find_mode(info->par, mode->xres, mode->yres, 8,
 612                                 UVESAFB_EXACT_RES) == -1)
 613                 return 0;
 614
 615         return 1;
 616 }
 617
 618 static int __devinit uvesafb_vbe_getedid(struct uvesafb_ktask *task,
 619                 struct fb_info *info)
 620 {
 621         struct uvesafb_par *par = info->par;
 622         int err = 0;
 623
 624         if (noedid || par->vbe_ib.vbe_version < 0x0300)
 625                 return -EINVAL;
 626
 627         task->t.regs.eax = 0x4f15;
 628         task->t.regs.ebx = 0;
 629         task->t.regs.ecx = 0;
 630         task->t.buf_len = 0;
 631         task->t.flags = 0;
 632
 633         err = uvesafb_exec(task);
 634
 635         if ((task->t.regs.eax & 0xffff) != 0x004f || err)
 636                 return -EINVAL;
 637
 638         if ((task->t.regs.ebx & 0x3) == 3) {
 639                 printk(KERN_INFO "uvesafb: VBIOS/hardware supports both "
 640                                  "DDC1 and DDC2 transfers\n");
 641         } else if ((task->t.regs.ebx & 0x3) == 2) {
 642                 printk(KERN_INFO "uvesafb: VBIOS/hardware supports DDC2 "
 643                                  "transfers\n");
 644         } else if ((task->t.regs.ebx & 0x3) == 1) {
 645                 printk(KERN_INFO "uvesafb: VBIOS/hardware supports DDC1 "
 646                                  "transfers\n");
 647         } else {
 648                 printk(KERN_INFO "uvesafb: VBIOS/hardware doesn't support "
 649                                  "DDC transfers\n");
 650                 return -EINVAL;
 651         }
 652
 653         task->t.regs.eax = 0x4f15;
 654         task->t.regs.ebx = 1;
 655         task->t.regs.ecx = task->t.regs.edx = 0;
 656         task->t.flags = TF_BUF_RET | TF_BUF_ESDI;
 657         task->t.buf_len = EDID_LENGTH;
 658         task->buf = kzalloc(EDID_LENGTH, GFP_KERNEL);
 659
 660         err = uvesafb_exec(task);
 661
 662         if ((task->t.regs.eax & 0xffff) == 0x004f && !err) {
 663                 fb_edid_to_monspecs(task->buf, &info->monspecs);
 664
 665                 if (info->monspecs.vfmax && info->monspecs.hfmax) {
 666                         /*
 667                          * If the maximum pixel clock wasn't specified in
 668                          * the EDID block, set it to 300 MHz.
 669                          */
 670                         if (info->monspecs.dclkmax == 0)
 671                                 info->monspecs.dclkmax = 300 * 1000000;
 672                         info->monspecs.gtf = 1;
 673                 }
 674         } else {
 675                 err = -EINVAL;
 676         }
 677
 678         kfree(task->buf);
 679         return err;
 680 }
 681
 682 static void __devinit uvesafb_vbe_getmonspecs(struct uvesafb_ktask *task,
 683                 struct fb_info *info)
 684 {
 685         struct uvesafb_par *par = info->par;
 686         int i;
 687
 688         memset(&info->monspecs, 0, sizeof(info->monspecs));
 689
 690         /*
 691          * If we don't get all necessary data from the EDID block,
 692          * mark it as incompatible with the GTF and set nocrtc so
 693          * that we always use the default BIOS refresh rate.
 694          */
 695         if (uvesafb_vbe_getedid(task, info)) {
 696                 info->monspecs.gtf = 0;
 697                 par->nocrtc = 1;
 698         }
 699
 700         /* Kernel command line overrides. */
 701         if (maxclk)
 702                 info->monspecs.dclkmax = maxclk * 1000000;
 703         if (maxvf)
 704                 info->monspecs.vfmax = maxvf;
 705         if (maxhf)
 706                 info->monspecs.hfmax = maxhf * 1000;
 707
 708         /*
 709          * In case DDC transfers are not supported, the user can provide
 710          * monitor limits manually. Lower limits are set to "safe" values.
 711          */
 712         if (info->monspecs.gtf == 0 && maxclk && maxvf && maxhf) {
 713                 info->monspecs.dclkmin = 0;
 714                 info->monspecs.vfmin = 60;
 715                 info->monspecs.hfmin = 29000;
 716                 info->monspecs.gtf = 1;
 717                 par->nocrtc = 0;
 718         }
 719
 720         if (info->monspecs.gtf)
 721                 printk(KERN_INFO
 722                         "uvesafb: monitor limits: vf = %d Hz, hf = %d kHz, "
 723                         "clk = %d MHz\n", info->monspecs.vfmax,
 724                         (int)(info->monspecs.hfmax / 1000),
 725                         (int)(info->monspecs.dclkmax / 1000000));
 726         else
 727                 printk(KERN_INFO "uvesafb: no monitor limits have been set, "
 728                                  "default refresh rate will be used\n");
 729
 730         /* Add VBE modes to the modelist. */
 731         for (i = 0; i < par->vbe_modes_cnt; i++) {
 732                 struct fb_var_screeninfo var;
 733                 struct vbe_mode_ib *mode;
 734                 struct fb_videomode vmode;
 735
 736                 mode = &par->vbe_modes[i];
 737                 memset(&var, 0, sizeof(var));
 738
 739                 var.xres = mode->x_res;
 740                 var.yres = mode->y_res;
 741
 742                 fb_get_mode(FB_VSYNCTIMINGS | FB_IGNOREMON, 60, &var, info);
 743                 fb_var_to_videomode(&vmode, &var);
 744                 fb_add_videomode(&vmode, &info->modelist);
 745         }
 746
 747         /* Add valid VESA modes to our modelist. */
 748         for (i = 0; i < VESA_MODEDB_SIZE; i++) {
 749                 if (uvesafb_is_valid_mode((struct fb_videomode *)
 750                                                 &vesa_modes[i], info))
 751                         fb_add_videomode(&vesa_modes[i], &info->modelist);
 752         }
 753
 754         for (i = 0; i < info->monspecs.modedb_len; i++) {
 755                 if (uvesafb_is_valid_mode(&info->monspecs.modedb[i], info))
 756                         fb_add_videomode(&info->monspecs.modedb[i],
 757                                         &info->modelist);
 758         }
 759
 760         return;
 761 }
 762
 763 static void __devinit uvesafb_vbe_getstatesize(struct uvesafb_ktask *task,
 764                 struct uvesafb_par *par)
 765 {
 766         int err;
 767
 768         uvesafb_reset(task);
 769
 770         /*
 771          * Get the VBE state buffer size. We want all available
 772          * hardware state data (CL = 0x0f).
 773          */
 774         task->t.regs.eax = 0x4f04;
 775         task->t.regs.ecx = 0x000f;
 776         task->t.regs.edx = 0x0000;
 777         task->t.flags = 0;
 778
 779         err = uvesafb_exec(task);
 780
 781         if (err || (task->t.regs.eax & 0xffff) != 0x004f) {
 782                 printk(KERN_WARNING "uvesafb: VBE state buffer size "
 783                         "cannot be determined (eax=0x%x, err=%d)\n",
 784                         task->t.regs.eax, err);
 785                 par->vbe_state_size = 0;
 786                 return;
 787         }
 788
 789         par->vbe_state_size = 64 * (task->t.regs.ebx & 0xffff);
 790 }
 791
 792 static int __devinit uvesafb_vbe_init(struct fb_info *info)
 793 {
 794         struct uvesafb_ktask *task = NULL;
 795         struct uvesafb_par *par = info->par;
 796         int err;
 797
 798         task = uvesafb_prep();
 799         if (!task)
 800                 return -ENOMEM;
 801
 802         err = uvesafb_vbe_getinfo(task, par);
 803         if (err)
 804                 goto out;
 805
 806         err = uvesafb_vbe_getmodes(task, par);
 807         if (err)
 808                 goto out;
 809
 810         par->nocrtc = nocrtc;
 811 #ifdef CONFIG_X86_32
 812         par->pmi_setpal = pmi_setpal;
 813         par->ypan = ypan;
 814
 815         if (par->pmi_setpal || par->ypan)
 816                 uvesafb_vbe_getpmi(task, par);
 817 #else
 818         /* The protected mode interface is not available on non-x86. */
 819         par->pmi_setpal = par->ypan = 0;
 820 #endif
 821
 822         INIT_LIST_HEAD(&info->modelist);
 823         uvesafb_vbe_getmonspecs(task, info);
 824         uvesafb_vbe_getstatesize(task, par);
 825
 826 out:    uvesafb_free(task);
 827         return err;
 828 }
 829
 830 static int __devinit uvesafb_vbe_init_mode(struct fb_info *info)
 831 {
 832         struct list_head *pos;
 833         struct fb_modelist *modelist;
 834         struct fb_videomode *mode;
 835         struct uvesafb_par *par = info->par;
 836         int i, modeid;
 837
 838         /* Has the user requested a specific VESA mode? */
 839         if (vbemode) {
 840                 for (i = 0; i < par->vbe_modes_cnt; i++) {
 841                         if (par->vbe_modes[i].mode_id == vbemode) {
 842                                 modeid = i;
 843                                 uvesafb_setup_var(&info->var, info,
 844                                                 &par->vbe_modes[modeid]);
 845                                 fb_get_mode(FB_VSYNCTIMINGS | FB_IGNOREMON, 60,
 846                                                 &info->var, info);
 847                                 /*
 848                                  * With pixclock set to 0, the default BIOS
 849                                  * timings will be used in set_par().
 850                                  */
 851                                 info->var.pixclock = 0;
 852                                 goto gotmode;
 853                         }
 854                 }
 855                 printk(KERN_INFO "uvesafb: requested VBE mode 0x%x is "
 856                                  "unavailable\n", vbemode);
 857                 vbemode = 0;
 858         }
 859
 860         /* Count the modes in the modelist */
 861         i = 0;
 862         list_for_each(pos, &info->modelist)
 863                 i++;
 864
 865         /*
 866          * Convert the modelist into a modedb so that we can use it with
 867          * fb_find_mode().
 868          */
 869         mode = kzalloc(i * sizeof(*mode), GFP_KERNEL);
 870         if (mode) {
 871                 i = 0;
 872                 list_for_each(pos, &info->modelist) {
 873                         modelist = list_entry(pos, struct fb_modelist, list);
 874                         mode[i] = modelist->mode;
 875                         i++;
 876                 }
 877
 878                 if (!mode_option)
 879                         mode_option = UVESAFB_DEFAULT_MODE;
 880
 881                 i = fb_find_mode(&info->var, info, mode_option, mode, i,
 882                         NULL, 8);
 883
 884                 kfree(mode);
 885         }
 886
 887         /* fb_find_mode() failed */
 888         if (i == 0) {
 889                 info->var.xres = 640;
 890                 info->var.yres = 480;
 891                 mode = (struct fb_videomode *)
 892                                 fb_find_best_mode(&info->var, &info->modelist);
 893
 894                 if (mode) {
 895                         fb_videomode_to_var(&info->var, mode);
 896                 } else {
 897                         modeid = par->vbe_modes[0].mode_id;
 898                         uvesafb_setup_var(&info->var, info,
 899                                         &par->vbe_modes[modeid]);
 900                         fb_get_mode(FB_VSYNCTIMINGS | FB_IGNOREMON, 60,
 901                                         &info->var, info);
 902
 903                         goto gotmode;
 904                 }
 905         }
 906
 907         /* Look for a matching VBE mode. */
 908         modeid = uvesafb_vbe_find_mode(par, info->var.xres, info->var.yres,
 909                         info->var.bits_per_pixel, UVESAFB_EXACT_RES);
 910
 911         if (modeid == -1)
 912                 return -EINVAL;
 913
 914         uvesafb_setup_var(&info->var, info, &par->vbe_modes[modeid]);
 915
 916 gotmode:
 917         /*
 918          * If we are not VBE3.0+ compliant, we're done -- the BIOS will
 919          * ignore our timings anyway.
 920          */
 921         if (par->vbe_ib.vbe_version < 0x0300 || par->nocrtc)
 922                 fb_get_mode(FB_VSYNCTIMINGS | FB_IGNOREMON, 60,
 923                                         &info->var, info);
 924
 925         return modeid;
 926 }
 927
 928 static int uvesafb_setpalette(struct uvesafb_pal_entry *entries, int count,
 929                 int start, struct fb_info *info)
 930 {
 931         struct uvesafb_ktask *task;
 932 #ifdef CONFIG_X86
 933         struct uvesafb_par *par = info->par;
 934         int i = par->mode_idx;
 935 #endif
 936         int err = 0;
 937
 938         /*
 939          * We support palette modifications for 8 bpp modes only, so
 940          * there can never be more than 256 entries.
 941          */
 942         if (start + count > 256)
 943                 return -EINVAL;
 944
 945 #ifdef CONFIG_X86
 946         /* Use VGA registers if mode is VGA-compatible. */
 947         if (i >= 0 && i < par->vbe_modes_cnt &&
 948             par->vbe_modes[i].mode_attr & VBE_MODE_VGACOMPAT) {
 949                 for (i = 0; i < count; i++) {
 950                         outb_p(start + i,        dac_reg);
 951                         outb_p(entries[i].red,   dac_val);
 952                         outb_p(entries[i].green, dac_val);
 953                         outb_p(entries[i].blue,  dac_val);
 954                 }
 955         }
 956 #ifdef CONFIG_X86_32
 957         else if (par->pmi_setpal) {
 958                 __asm__ __volatile__(
 959                 "call *(%%esi)"
 960                 : /* no return value */
 961                 : "a" (0x4f09),         /* EAX */
 962                   "b" (0),              /* EBX */
 963                   "c" (count),          /* ECX */
 964                   "d" (start),          /* EDX */
 965                   "D" (entries),        /* EDI */
 966                   "S" (&par->pmi_pal)); /* ESI */
 967         }
 968 #endif /* CONFIG_X86_32 */
 969         else
 970 #endif /* CONFIG_X86 */
 971         {
 972                 task = uvesafb_prep();
 973                 if (!task)
 974                         return -ENOMEM;
 975
 976                 task->t.regs.eax = 0x4f09;
 977                 task->t.regs.ebx = 0x0;
 978                 task->t.regs.ecx = count;
 979                 task->t.regs.edx = start;
 980                 task->t.flags = TF_BUF_ESDI;
 981                 task->t.buf_len = sizeof(struct uvesafb_pal_entry) * count;
 982                 task->buf = entries;
 983
 984                 err = uvesafb_exec(task);
 985                 if ((task->t.regs.eax & 0xffff) != 0x004f)
 986                         err = 1;
 987
 988                 uvesafb_free(task);
 989         }
 990         return err;
 991 }
 992
 993 static int uvesafb_setcolreg(unsigned regno, unsigned red, unsigned green,
 994                 unsigned blue, unsigned transp,
 995                 struct fb_info *info)
 996 {
 997         struct uvesafb_pal_entry entry;
 998         int shift = 16 - dac_width;
 999         int err = 0;
1000
1001         if (regno >= info->cmap.len)
1002                 return -EINVAL;
1003
1004         if (info->var.bits_per_pixel == 8) {
1005                 entry.red   = red   >> shift;
1006                 entry.green = green >> shift;
1007                 entry.blue  = blue  >> shift;
1008                 entry.pad   = 0;
1009
1010                 err = uvesafb_setpalette(&entry, 1, regno, info);
1011         } else if (regno < 16) {
1012                 switch (info->var.bits_per_pixel) {
1013                 case 16:
1014                         if (info->var.red.offset == 10) {
1015                                 /* 1:5:5:5 */
1016                                 ((u32 *) (info->pseudo_palette))[regno] =
1017                                                 ((red   & 0xf800) >>  1) |
1018                                                 ((green & 0xf800) >>  6) |
1019                                                 ((blue  & 0xf800) >> 11);
1020                         } else {
1021                                 /* 0:5:6:5 */
1022                                 ((u32 *) (info->pseudo_palette))[regno] =
1023                                                 ((red   & 0xf800)      ) |
1024                                                 ((green & 0xfc00) >>  5) |
1025                                                 ((blue  & 0xf800) >> 11);
1026                         }
1027                         break;
1028
1029                 case 24:
1030                 case 32:
1031                         red   >>= 8;
1032                         green >>= 8;
1033                         blue  >>= 8;
1034                         ((u32 *)(info->pseudo_palette))[regno] =
1035                                 (red   << info->var.red.offset)   |
1036                                 (green << info->var.green.offset) |
1037                                 (blue  << info->var.blue.offset);
1038                         break;
1039                 }
1040         }
1041         return err;
1042 }
1043
1044 static int uvesafb_setcmap(struct fb_cmap *cmap, struct fb_info *info)
1045 {
1046         struct uvesafb_pal_entry *entries;
1047         int shift = 16 - dac_width;
1048         int i, err = 0;
1049
1050         if (info->var.bits_per_pixel == 8) {
1051                 if (cmap->start + cmap->len > info->cmap.start +
1052                     info->cmap.len || cmap->start < info->cmap.start)
1053                         return -EINVAL;
1054
1055                 entries = kmalloc(sizeof(*entries) * cmap->len, GFP_KERNEL);
1056                 if (!entries)
1057                         return -ENOMEM;
1058
1059                 for (i = 0; i < cmap->len; i++) {
1060                         entries[i].red   = cmap->red[i]   >> shift;
1061                         entries[i].green = cmap->green[i] >> shift;
1062                         entries[i].blue  = cmap->blue[i]  >> shift;
1063                         entries[i].pad   = 0;
1064                 }
1065                 err = uvesafb_setpalette(entries, cmap->len, cmap->start, info);
1066                 kfree(entries);
1067         } else {
1068                 /*
1069                  * For modes with bpp > 8, we only set the pseudo palette in
1070                  * the fb_info struct. We rely on uvesafb_setcolreg to do all
1071                  * sanity checking.
1072                  */
1073                 for (i = 0; i < cmap->len; i++) {
1074                         err |= uvesafb_setcolreg(cmap->start + i, cmap->red[i],
1075                                                 cmap->green[i], cmap->blue[i],
1076                                                 0, info);
1077                 }
1078         }
1079         return err;
1080 }
1081
1082 static int uvesafb_pan_display(struct fb_var_screeninfo *var,
1083                 struct fb_info *info)
1084 {
1085 #ifdef CONFIG_X86_32
1086         int offset;
1087         struct uvesafb_par *par = info->par;
1088
1089         offset = (var->yoffset * info->fix.line_length + var->xoffset) / 4;
1090
1091         /*
1092          * It turns out it's not the best idea to do panning via vm86,
1093          * so we only allow it if we have a PMI.
1094          */
1095         if (par->pmi_start) {
1096                 __asm__ __volatile__(
1097                         "call *(%%edi)"
1098                         : /* no return value */
1099                         : "a" (0x4f07),         /* EAX */
1100                           "b" (0),              /* EBX */
1101                           "c" (offset),         /* ECX */
1102                           "d" (offset >> 16),   /* EDX */
1103                           "D" (&par->pmi_start));    /* EDI */
1104         }
1105 #endif
1106         return 0;
1107 }
1108
1109 static int uvesafb_blank(int blank, struct fb_info *info)
1110 {
1111         struct uvesafb_ktask *task;
1112         int err = 1;
1113 #ifdef CONFIG_X86
1114         struct uvesafb_par *par = info->par;
1115
1116         if (par->vbe_ib.capabilities & VBE_CAP_VGACOMPAT) {
1117                 int loop = 10000;
1118                 u8 seq = 0, crtc17 = 0;
1119
1120                 if (blank == FB_BLANK_POWERDOWN) {
1121                         seq = 0x20;
1122                         crtc17 = 0x00;
1123                         err = 0;
1124                 } else {
1125                         seq = 0x00;
1126                         crtc17 = 0x80;
1127                         err = (blank == FB_BLANK_UNBLANK) ? 0 : -EINVAL;
1128                 }
1129
1130                 vga_wseq(NULL, 0x00, 0x01);
1131                 seq |= vga_rseq(NULL, 0x01) & ~0x20;
1132                 vga_wseq(NULL, 0x00, seq);
1133
1134                 crtc17 |= vga_rcrt(NULL, 0x17) & ~0x80;
1135                 while (loop--);
1136                 vga_wcrt(NULL, 0x17, crtc17);
1137                 vga_wseq(NULL, 0x00, 0x03);
1138         } else
1139 #endif /* CONFIG_X86 */
1140         {
1141                 task = uvesafb_prep();
1142                 if (!task)
1143                         return -ENOMEM;
1144
1145                 task->t.regs.eax = 0x4f10;
1146                 switch (blank) {
1147                 case FB_BLANK_UNBLANK:
1148                         task->t.regs.ebx = 0x0001;
1149                         break;
1150                 case FB_BLANK_NORMAL:
1151                         task->t.regs.ebx = 0x0101;      /* standby */
1152                         break;
1153                 case FB_BLANK_POWERDOWN:
1154                         task->t.regs.ebx = 0x0401;      /* powerdown */
1155                         break;
1156                 default:
1157                         goto out;
1158                 }
1159
1160                 err = uvesafb_exec(task);
1161                 if (err || (task->t.regs.eax & 0xffff) != 0x004f)
1162                         err = 1;
1163 out:            uvesafb_free(task);
1164         }
1165         return err;
1166 }
1167
1168 static int uvesafb_open(struct fb_info *info, int user)
1169 {
1170         struct uvesafb_par *par = info->par;
1171         int cnt = atomic_read(&par->ref_count);
1172
1173         if (!cnt && par->vbe_state_size)
1174                 par->vbe_state_orig = uvesafb_vbe_state_save(par);
1175
1176         atomic_inc(&par->ref_count);
1177         return 0;
1178 }
1179
1180 static int uvesafb_release(struct fb_info *info, int user)
1181 {
1182         struct uvesafb_ktask *task = NULL;
1183         struct uvesafb_par *par = info->par;
1184         int cnt = atomic_read(&par->ref_count);
1185
1186         if (!cnt)
1187                 return -EINVAL;
1188
1189         if (cnt != 1)
1190                 goto out;
1191
1192         task = uvesafb_prep();
1193         if (!task)
1194                 goto out;
1195
1196         /* First, try to set the standard 80x25 text mode. */
1197         task->t.regs.eax = 0x0003;
1198         uvesafb_exec(task);
1199
1200         /*
1201          * Now try to restore whatever hardware state we might have
1202          * saved when the fb device was first opened.
1203          */
1204         uvesafb_vbe_state_restore(par, par->vbe_state_orig);
1205 out:
1206         atomic_dec(&par->ref_count);
1207         if (task)
1208                 uvesafb_free(task);
1209         return 0;
1210 }
1211
1212 static int uvesafb_set_par(struct fb_info *info)
1213 {
1214         struct uvesafb_par *par = info->par;
1215         struct uvesafb_ktask *task = NULL;
1216         struct vbe_crtc_ib *crtc = NULL;
1217         struct vbe_mode_ib *mode = NULL;
1218         int i, err = 0, depth = info->var.bits_per_pixel;
1219
1220         if (depth > 8 && depth != 32)
1221                 depth = info->var.red.length + info->var.green.length +
1222                         info->var.blue.length;
1223
1224         i = uvesafb_vbe_find_mode(par, info->var.xres, info->var.yres, depth,
1225                                  UVESAFB_EXACT_RES | UVESAFB_EXACT_DEPTH);
1226         if (i >= 0)
1227                 mode = &par->vbe_modes[i];
1228         else
1229                 return -EINVAL;
1230
1231         task = uvesafb_prep();
1232         if (!task)
1233                 return -ENOMEM;
1234 setmode:
1235         task->t.regs.eax = 0x4f02;
1236         task->t.regs.ebx = mode->mode_id | 0x4000;      /* use LFB */
1237
1238         if (par->vbe_ib.vbe_version >= 0x0300 && !par->nocrtc &&
1239             info->var.pixclock != 0) {
1240                 task->t.regs.ebx |= 0x0800;             /* use CRTC data */
1241                 task->t.flags = TF_BUF_ESDI;
1242                 crtc = kzalloc(sizeof(struct vbe_crtc_ib), GFP_KERNEL);
1243                 if (!crtc) {
1244                         err = -ENOMEM;
1245                         goto out;
1246                 }
1247                 crtc->horiz_start = info->var.xres + info->var.right_margin;
1248                 crtc->horiz_end   = crtc->horiz_start + info->var.hsync_len;
1249                 crtc->horiz_total = crtc->horiz_end + info->var.left_margin;
1250
1251                 crtc->vert_start  = info->var.yres + info->var.lower_margin;
1252                 crtc->vert_end    = crtc->vert_start + info->var.vsync_len;
1253                 crtc->vert_total  = crtc->vert_end + info->var.upper_margin;
1254
1255                 crtc->pixel_clock = PICOS2KHZ(info->var.pixclock) * 1000;
1256                 crtc->refresh_rate = (u16)(100 * (crtc->pixel_clock /
1257                                 (crtc->vert_total * crtc->horiz_total)));
1258
1259                 if (info->var.vmode & FB_VMODE_DOUBLE)
1260                         crtc->flags |= 0x1;
1261                 if (info->var.vmode & FB_VMODE_INTERLACED)
1262                         crtc->flags |= 0x2;
1263                 if (!(info->var.sync & FB_SYNC_HOR_HIGH_ACT))
1264                         crtc->flags |= 0x4;
1265                 if (!(info->var.sync & FB_SYNC_VERT_HIGH_ACT))
1266                         crtc->flags |= 0x8;
1267                 memcpy(&par->crtc, crtc, sizeof(*crtc));
1268         } else {
1269                 memset(&par->crtc, 0, sizeof(*crtc));
1270         }
1271
1272         task->t.buf_len = sizeof(struct vbe_crtc_ib);
1273         task->buf = &par->crtc;
1274
1275         err = uvesafb_exec(task);
1276         if (err || (task->t.regs.eax & 0xffff) != 0x004f) {
1277                 /*
1278                  * The mode switch might have failed because we tried to
1279                  * use our own timings.  Try again with the default timings.
1280                  */
1281                 if (crtc != NULL) {
1282                         printk(KERN_WARNING "uvesafb: mode switch failed "
1283                                 "(eax=0x%x, err=%d). Trying again with "
1284                                 "default timings.\n", task->t.regs.eax, err);
1285                         uvesafb_reset(task);
1286                         kfree(crtc);
1287                         crtc = NULL;
1288                         info->var.pixclock = 0;
1289                         goto setmode;
1290                 } else {
1291                         printk(KERN_ERR "uvesafb: mode switch failed (eax="
1292                                 "0x%x, err=%d)\n", task->t.regs.eax, err);
1293                         err = -EINVAL;
1294                         goto out;
1295                 }
1296         }
1297         par->mode_idx = i;
1298
1299         /* For 8bpp modes, always try to set the DAC to 8 bits. */
1300         if (par->vbe_ib.capabilities & VBE_CAP_CAN_SWITCH_DAC &&
1301             mode->bits_per_pixel <= 8) {
1302                 uvesafb_reset(task);
1303                 task->t.regs.eax = 0x4f08;
1304                 task->t.regs.ebx = 0x0800;
1305
1306                 err = uvesafb_exec(task);
1307                 if (err || (task->t.regs.eax & 0xffff) != 0x004f ||
1308                     ((task->t.regs.ebx & 0xff00) >> 8) != 8) {
1309                         dac_width = 6;
1310                 } else {
1311                         dac_width = 8;
1312                 }
1313         }
1314
1315         info->fix.visual = (info->var.bits_per_pixel == 8) ?
1316                                 FB_VISUAL_PSEUDOCOLOR : FB_VISUAL_TRUECOLOR;
1317         info->fix.line_length = mode->bytes_per_scan_line;
1318
1319 out:    if (crtc != NULL)
1320                 kfree(crtc);
1321         uvesafb_free(task);
1322
1323         return err;
1324 }
1325
1326 static void uvesafb_check_limits(struct fb_var_screeninfo *var,
1327                 struct fb_info *info)
1328 {
1329         const struct fb_videomode *mode;
1330         struct uvesafb_par *par = info->par;
1331
1332         /*
1333          * If pixclock is set to 0, then we're using default BIOS timings
1334          * and thus don't have to perform any checks here.
1335          */
1336         if (!var->pixclock)
1337                 return;
1338
1339         if (par->vbe_ib.vbe_version < 0x0300) {
1340                 fb_get_mode(FB_VSYNCTIMINGS | FB_IGNOREMON, 60, var, info);
1341                 return;
1342         }
1343
1344         if (!fb_validate_mode(var, info))
1345                 return;
1346
1347         mode = fb_find_best_mode(var, &info->modelist);
1348         if (mode) {
1349                 if (mode->xres == var->xres && mode->yres == var->yres &&
1350                     !(mode->vmode & (FB_VMODE_INTERLACED | FB_VMODE_DOUBLE))) {
1351                         fb_videomode_to_var(var, mode);
1352                         return;
1353                 }
1354         }
1355
1356         if (info->monspecs.gtf && !fb_get_mode(FB_MAXTIMINGS, 0, var, info))
1357                 return;
1358         /* Use default refresh rate */
1359         var->pixclock = 0;
1360 }
1361
1362 static int uvesafb_check_var(struct fb_var_screeninfo *var,
1363                 struct fb_info *info)
1364 {
1365         struct uvesafb_par *par = info->par;
1366         struct vbe_mode_ib *mode = NULL;
1367         int match = -1;
1368         int depth = var->red.length + var->green.length + var->blue.length;
1369
1370         /*
1371          * Various apps will use bits_per_pixel to set the color depth,
1372          * which is theoretically incorrect, but which we'll try to handle
1373          * here.
1374          */
1375         if (depth == 0 || abs(depth - var->bits_per_pixel) >= 8)
1376                 depth = var->bits_per_pixel;
1377
1378         match = uvesafb_vbe_find_mode(par, var->xres, var->yres, depth,
1379                                                 UVESAFB_EXACT_RES);
1380         if (match == -1)
1381                 return -EINVAL;
1382
1383         mode = &par->vbe_modes[match];
1384         uvesafb_setup_var(var, info, mode);
1385
1386         /*
1387          * Check whether we have remapped enough memory for this mode.
1388          * We might be called at an early stage, when we haven't remapped
1389          * any memory yet, in which case we simply skip the check.
1390          */
1391         if (var->yres * mode->bytes_per_scan_line > info->fix.smem_len
1392                                                 && info->fix.smem_len)
1393                 return -EINVAL;
1394
1395         if ((var->vmode & FB_VMODE_DOUBLE) &&
1396                                 !(par->vbe_modes[match].mode_attr & 0x100))
1397                 var->vmode &= ~FB_VMODE_DOUBLE;
1398
1399         if ((var->vmode & FB_VMODE_INTERLACED) &&
1400                                 !(par->vbe_modes[match].mode_attr & 0x200))
1401                 var->vmode &= ~FB_VMODE_INTERLACED;
1402
1403         uvesafb_check_limits(var, info);
1404
1405         var->xres_virtual = var->xres;
1406         var->yres_virtual = (par->ypan) ?
1407                                 info->fix.smem_len / mode->bytes_per_scan_line :
1408                                 var->yres;
1409         return 0;
1410 }
1411
1412 static void uvesafb_save_state(struct fb_info *info)
1413 {
1414         struct uvesafb_par *par = info->par;
1415
1416         if (par->vbe_state_saved)
1417                 kfree(par->vbe_state_saved);
1418
1419         par->vbe_state_saved = uvesafb_vbe_state_save(par);
1420 }
1421
1422 static void uvesafb_restore_state(struct fb_info *info)
1423 {
1424         struct uvesafb_par *par = info->par;
1425
1426         uvesafb_vbe_state_restore(par, par->vbe_state_saved);
1427 }
1428
1429 static struct fb_ops uvesafb_ops = {
1430         .owner          = THIS_MODULE,
1431         .fb_open        = uvesafb_open,
1432         .fb_release     = uvesafb_release,
1433         .fb_setcolreg   = uvesafb_setcolreg,
1434         .fb_setcmap     = uvesafb_setcmap,
1435         .fb_pan_display = uvesafb_pan_display,
1436         .fb_blank       = uvesafb_blank,
1437         .fb_fillrect    = cfb_fillrect,
1438         .fb_copyarea    = cfb_copyarea,
1439         .fb_imageblit   = cfb_imageblit,
1440         .fb_check_var   = uvesafb_check_var,
1441         .fb_set_par     = uvesafb_set_par,
1442         .fb_save_state  = uvesafb_save_state,
1443         .fb_restore_state = uvesafb_restore_state,
1444 };
1445
1446 static void __devinit uvesafb_init_info(struct fb_info *info,
1447                 struct vbe_mode_ib *mode)
1448 {
1449         unsigned int size_vmode;
1450         unsigned int size_remap;
1451         unsigned int size_total;
1452         struct uvesafb_par *par = info->par;
1453         int i, h;
1454
1455         info->pseudo_palette = ((u8 *)info->par + sizeof(struct uvesafb_par));
1456         info->fix = uvesafb_fix;
1457         info->fix.ypanstep = par->ypan ? 1 : 0;
1458         info->fix.ywrapstep = (par->ypan > 1) ? 1 : 0;
1459
1460         /*
1461          * If we were unable to get the state buffer size, disable
1462          * functions for saving and restoring the hardware state.
1463          */
1464         if (par->vbe_state_size == 0) {
1465                 info->fbops->fb_save_state = NULL;
1466                 info->fbops->fb_restore_state = NULL;
1467         }
1468
1469         /* Disable blanking if the user requested so. */
1470         if (!blank)
1471                 info->fbops->fb_blank = NULL;
1472
1473         /*
1474          * Find out how much IO memory is required for the mode with
1475          * the highest resolution.
1476          */
1477         size_remap = 0;
1478         for (i = 0; i < par->vbe_modes_cnt; i++) {
1479                 h = par->vbe_modes[i].bytes_per_scan_line *
1480                                         par->vbe_modes[i].y_res;
1481                 if (h > size_remap)
1482                         size_remap = h;
1483         }
1484         size_remap *= 2;
1485
1486         /*
1487          *   size_vmode -- that is the amount of memory needed for the
1488          *                 used video mode, i.e. the minimum amount of
1489          *                 memory we need.
1490          */
1491         if (mode != NULL) {
1492                 size_vmode = info->var.yres * mode->bytes_per_scan_line;
1493         } else {
1494                 size_vmode = info->var.yres * info->var.xres *
1495                              ((info->var.bits_per_pixel + 7) >> 3);
1496         }
1497
1498         /*
1499          *   size_total -- all video memory we have. Used for mtrr
1500          *                 entries, resource allocation and bounds
1501          *                 checking.
1502          */
1503         size_total = par->vbe_ib.total_memory * 65536;
1504         if (vram_total)
1505                 size_total = vram_total * 1024 * 1024;
1506         if (size_total < size_vmode)
1507                 size_total = size_vmode;
1508
1509         /*
1510          *   size_remap -- the amount of video memory we are going to
1511          *                 use for vesafb.  With modern cards it is no
1512          *                 option to simply use size_total as th
1513          *                 wastes plenty of kernel address space.
1514          */
1515         if (vram_remap)
1516                 size_remap = vram_remap * 1024 * 1024;
1517         if (size_remap < size_vmode)
1518                 size_remap = size_vmode;
1519         if (size_remap > size_total)
1520                 size_remap = size_total;
1521
1522         info->fix.smem_len = size_remap;
1523         info->fix.smem_start = mode->phys_base_ptr;
1524
1525         /*
1526          * We have to set yres_virtual here because when setup_var() was
1527          * called, smem_len wasn't defined yet.
1528          */
1529         info->var.yres_virtual = info->fix.smem_len /
1530                                  mode->bytes_per_scan_line;
1531
1532         if (par->ypan && info->var.yres_virtual > info->var.yres) {
1533                 printk(KERN_INFO "uvesafb: scrolling: %s "
1534                         "using protected mode interface, "
1535                         "yres_virtual=%d\n",
1536                         (par->ypan > 1) ? "ywrap" : "ypan",
1537                         info->var.yres_virtual);
1538         } else {
1539                 printk(KERN_INFO "uvesafb: scrolling: redraw\n");
1540                 info->var.yres_virtual = info->var.yres;
1541                 par->ypan = 0;
1542         }
1543
1544         info->flags = FBINFO_FLAG_DEFAULT |
1545                         (par->ypan ? FBINFO_HWACCEL_YPAN : 0);
1546
1547         if (!par->ypan)
1548                 info->fbops->fb_pan_display = NULL;
1549 }
1550
1551 static void __devinit uvesafb_init_mtrr(struct fb_info *info)
1552 {
1553 #ifdef CONFIG_MTRR
1554         if (mtrr && !(info->fix.smem_start & (PAGE_SIZE - 1))) {
1555                 int temp_size = info->fix.smem_len;
1556                 unsigned int type = 0;
1557
1558                 switch (mtrr) {
1559                 case 1:
1560                         type = MTRR_TYPE_UNCACHABLE;
1561                         break;
1562                 case 2:
1563                         type = MTRR_TYPE_WRBACK;
1564                         break;
1565                 case 3:
1566                         type = MTRR_TYPE_WRCOMB;
1567                         break;
1568                 case 4:
1569                         type = MTRR_TYPE_WRTHROUGH;
1570                         break;
1571                 default:
1572                         type = 0;
1573                         break;
1574                 }
1575
1576                 if (type) {
1577                         int rc;
1578
1579                         /* Find the largest power-of-two */
1580                         while (temp_size & (temp_size - 1))
1581                                 temp_size &= (temp_size - 1);
1582
1583                         /* Try and find a power of two to add */
1584                         do {
1585                                 rc = mtrr_add(info->fix.smem_start,
1586                                               temp_size, type, 1);
1587                                 temp_size >>= 1;
1588                         } while (temp_size >= PAGE_SIZE && rc == -EINVAL);
1589                 }
1590         }
1591 #endif /* CONFIG_MTRR */
1592 }
1593
1594
1595 static ssize_t uvesafb_show_vbe_ver(struct device *dev,
1596                 struct device_attribute *attr, char *buf)
1597 {
1598         struct fb_info *info = platform_get_drvdata(to_platform_device(dev));
1599         struct uvesafb_par *par = info->par;
1600
1601         return snprintf(buf, PAGE_SIZE, "%.4x\n", par->vbe_ib.vbe_version);
1602 }
1603
1604 static DEVICE_ATTR(vbe_version, S_IRUGO, uvesafb_show_vbe_ver, NULL);
1605
1606 static ssize_t uvesafb_show_vbe_modes(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         int ret = 0, i;
1612
1613         for (i = 0; i < par->vbe_modes_cnt && ret < PAGE_SIZE; i++) {
1614                 ret += snprintf(buf + ret, PAGE_SIZE - ret,
1615                         "%dx%d-%d, 0x%.4x\n",
1616                         par->vbe_modes[i].x_res, par->vbe_modes[i].y_res,
1617                         par->vbe_modes[i].depth, par->vbe_modes[i].mode_id);
1618         }
1619
1620         return ret;
1621 }
1622
1623 static DEVICE_ATTR(vbe_modes, S_IRUGO, uvesafb_show_vbe_modes, NULL);
1624
1625 static ssize_t uvesafb_show_vendor(struct device *dev,
1626                 struct device_attribute *attr, char *buf)
1627 {
1628         struct fb_info *info = platform_get_drvdata(to_platform_device(dev));
1629         struct uvesafb_par *par = info->par;
1630
1631         if (par->vbe_ib.oem_vendor_name_ptr)
1632                 return snprintf(buf, PAGE_SIZE, "%s\n", (char *)
1633                         (&par->vbe_ib) + par->vbe_ib.oem_vendor_name_ptr);
1634         else
1635                 return 0;
1636 }
1637
1638 static DEVICE_ATTR(oem_vendor, S_IRUGO, uvesafb_show_vendor, NULL);
1639
1640 static ssize_t uvesafb_show_product_name(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_product_name_ptr)
1647                 return snprintf(buf, PAGE_SIZE, "%s\n", (char *)
1648                         (&par->vbe_ib) + par->vbe_ib.oem_product_name_ptr);
1649         else
1650                 return 0;
1651 }
1652
1653 static DEVICE_ATTR(oem_product_name, S_IRUGO, uvesafb_show_product_name, NULL);
1654
1655 static ssize_t uvesafb_show_product_rev(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_rev_ptr)
1662                 return snprintf(buf, PAGE_SIZE, "%s\n", (char *)
1663                         (&par->vbe_ib) + par->vbe_ib.oem_product_rev_ptr);
1664         else
1665                 return 0;
1666 }
1667
1668 static DEVICE_ATTR(oem_product_rev, S_IRUGO, uvesafb_show_product_rev, NULL);
1669
1670 static ssize_t uvesafb_show_oem_string(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_string_ptr)
1677                 return snprintf(buf, PAGE_SIZE, "%s\n",
1678                         (char *)(&par->vbe_ib) + par->vbe_ib.oem_string_ptr);
1679         else
1680                 return 0;
1681 }
1682
1683 static DEVICE_ATTR(oem_string, S_IRUGO, uvesafb_show_oem_string, NULL);
1684
1685 static ssize_t uvesafb_show_nocrtc(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         return snprintf(buf, PAGE_SIZE, "%d\n", par->nocrtc);
1692 }
1693
1694 static ssize_t uvesafb_store_nocrtc(struct device *dev,
1695                 struct device_attribute *attr, const char *buf, size_t count)
1696 {
1697         struct fb_info *info = platform_get_drvdata(to_platform_device(dev));
1698         struct uvesafb_par *par = info->par;
1699
1700         if (count > 0) {
1701                 if (buf[0] == '0')
1702                         par->nocrtc = 0;
1703                 else
1704                         par->nocrtc = 1;
1705         }
1706         return count;
1707 }
1708
1709 static DEVICE_ATTR(nocrtc, S_IRUGO | S_IWUSR, uvesafb_show_nocrtc,
1710                         uvesafb_store_nocrtc);
1711
1712 static struct attribute *uvesafb_dev_attrs[] = {
1713         &dev_attr_vbe_version.attr,
1714         &dev_attr_vbe_modes.attr,
1715         &dev_attr_oem_vendor.attr,
1716         &dev_attr_oem_product_name.attr,
1717         &dev_attr_oem_product_rev.attr,
1718         &dev_attr_oem_string.attr,
1719         &dev_attr_nocrtc.attr,
1720         NULL,
1721 };
1722
1723 static struct attribute_group uvesafb_dev_attgrp = {
1724         .name = NULL,
1725         .attrs = uvesafb_dev_attrs,
1726 };
1727
1728 static int __devinit uvesafb_probe(struct platform_device *dev)
1729 {
1730         struct fb_info *info;
1731         struct vbe_mode_ib *mode = NULL;
1732         struct uvesafb_par *par;
1733         int err = 0, i;
1734
1735         info = framebuffer_alloc(sizeof(*par) + sizeof(u32) * 256, &dev->dev);
1736         if (!info)
1737                 return -ENOMEM;
1738
1739         par = info->par;
1740
1741         err = uvesafb_vbe_init(info);
1742         if (err) {
1743                 printk(KERN_ERR "uvesafb: vbe_init() failed with %d\n", err);
1744                 goto out;
1745         }
1746
1747         info->fbops = &uvesafb_ops;
1748
1749         i = uvesafb_vbe_init_mode(info);
1750         if (i < 0) {
1751                 err = -EINVAL;
1752                 goto out;
1753         } else {
1754                 mode = &par->vbe_modes[i];
1755         }
1756
1757         if (fb_alloc_cmap(&info->cmap, 256, 0) < 0) {
1758                 err = -ENXIO;
1759                 goto out;
1760         }
1761
1762         uvesafb_init_info(info, mode);
1763
1764         if (!request_mem_region(info->fix.smem_start, info->fix.smem_len,
1765                                 "uvesafb")) {
1766                 printk(KERN_ERR "uvesafb: cannot reserve video memory at "
1767                                 "0x%lx\n", info->fix.smem_start);
1768                 err = -EIO;
1769                 goto out_mode;
1770         }
1771
1772         info->screen_base = ioremap(info->fix.smem_start, info->fix.smem_len);
1773
1774         if (!info->screen_base) {
1775                 printk(KERN_ERR
1776                         "uvesafb: abort, cannot ioremap 0x%x bytes of video "
1777                         "memory at 0x%lx\n",
1778                         info->fix.smem_len, info->fix.smem_start);
1779                 err = -EIO;
1780                 goto out_mem;
1781         }
1782
1783         if (!request_region(0x3c0, 32, "uvesafb")) {
1784                 printk(KERN_ERR "uvesafb: request region 0x3c0-0x3e0 failed\n");
1785                 err = -EIO;
1786                 goto out_unmap;
1787         }
1788
1789         uvesafb_init_mtrr(info);
1790         platform_set_drvdata(dev, info);
1791
1792         if (register_framebuffer(info) < 0) {
1793                 printk(KERN_ERR
1794                         "uvesafb: failed to register framebuffer device\n");
1795                 err = -EINVAL;
1796                 goto out_reg;
1797         }
1798
1799         printk(KERN_INFO "uvesafb: framebuffer at 0x%lx, mapped to 0x%p, "
1800                         "using %dk, total %dk\n", info->fix.smem_start,
1801                         info->screen_base, info->fix.smem_len/1024,
1802                         par->vbe_ib.total_memory * 64);
1803         printk(KERN_INFO "fb%d: %s frame buffer device\n", info->node,
1804                         info->fix.id);
1805
1806         err = sysfs_create_group(&dev->dev.kobj, &uvesafb_dev_attgrp);
1807         if (err != 0)
1808                 printk(KERN_WARNING "fb%d: failed to register attributes\n",
1809                         info->node);
1810
1811         return 0;
1812
1813 out_reg:
1814         release_region(0x3c0, 32);
1815 out_unmap:
1816         iounmap(info->screen_base);
1817 out_mem:
1818         release_mem_region(info->fix.smem_start, info->fix.smem_len);
1819 out_mode:
1820         if (!list_empty(&info->modelist))
1821                 fb_destroy_modelist(&info->modelist);
1822         fb_destroy_modedb(info->monspecs.modedb);
1823         fb_dealloc_cmap(&info->cmap);
1824 out:
1825         if (par->vbe_modes)
1826                 kfree(par->vbe_modes);
1827
1828         framebuffer_release(info);
1829         return err;
1830 }
1831
1832 static int uvesafb_remove(struct platform_device *dev)
1833 {
1834         struct fb_info *info = platform_get_drvdata(dev);
1835
1836         if (info) {
1837                 struct uvesafb_par *par = info->par;
1838
1839                 sysfs_remove_group(&dev->dev.kobj, &uvesafb_dev_attgrp);
1840                 unregister_framebuffer(info);
1841                 release_region(0x3c0, 32);
1842                 iounmap(info->screen_base);
1843                 release_mem_region(info->fix.smem_start, info->fix.smem_len);
1844                 fb_destroy_modedb(info->monspecs.modedb);
1845                 fb_dealloc_cmap(&info->cmap);
1846
1847                 if (par) {
1848                         if (par->vbe_modes)
1849                                 kfree(par->vbe_modes);
1850                         if (par->vbe_state_orig)
1851                                 kfree(par->vbe_state_orig);
1852                         if (par->vbe_state_saved)
1853                                 kfree(par->vbe_state_saved);
1854                 }
1855
1856                 framebuffer_release(info);
1857         }
1858         return 0;
1859 }
1860
1861 static struct platform_driver uvesafb_driver = {
1862         .probe  = uvesafb_probe,
1863         .remove = uvesafb_remove,
1864         .driver = {
1865                 .name = "uvesafb",
1866         },
1867 };
1868
1869 static struct platform_device *uvesafb_device;
1870
1871 #ifndef MODULE
1872 static int __devinit uvesafb_setup(char *options)
1873 {
1874         char *this_opt;
1875
1876         if (!options || !*options)
1877                 return 0;
1878
1879         while ((this_opt = strsep(&options, ",")) != NULL) {
1880                 if (!*this_opt) continue;
1881
1882                 if (!strcmp(this_opt, "redraw"))
1883                         ypan = 0;
1884                 else if (!strcmp(this_opt, "ypan"))
1885                         ypan = 1;
1886                 else if (!strcmp(this_opt, "ywrap"))
1887                         ypan = 2;
1888                 else if (!strcmp(this_opt, "vgapal"))
1889                         pmi_setpal = 0;
1890                 else if (!strcmp(this_opt, "pmipal"))
1891                         pmi_setpal = 1;
1892                 else if (!strncmp(this_opt, "mtrr:", 5))
1893                         mtrr = simple_strtoul(this_opt+5, NULL, 0);
1894                 else if (!strcmp(this_opt, "nomtrr"))
1895                         mtrr = 0;
1896                 else if (!strcmp(this_opt, "nocrtc"))
1897                         nocrtc = 1;
1898                 else if (!strcmp(this_opt, "noedid"))
1899                         noedid = 1;
1900                 else if (!strcmp(this_opt, "noblank"))
1901                         blank = 0;
1902                 else if (!strncmp(this_opt, "vtotal:", 7))
1903                         vram_total = simple_strtoul(this_opt + 7, NULL, 0);
1904                 else if (!strncmp(this_opt, "vremap:", 7))
1905                         vram_remap = simple_strtoul(this_opt + 7, NULL, 0);
1906                 else if (!strncmp(this_opt, "maxhf:", 6))
1907                         maxhf = simple_strtoul(this_opt + 6, NULL, 0);
1908                 else if (!strncmp(this_opt, "maxvf:", 6))
1909                         maxvf = simple_strtoul(this_opt + 6, NULL, 0);
1910                 else if (!strncmp(this_opt, "maxclk:", 7))
1911                         maxclk = simple_strtoul(this_opt + 7, NULL, 0);
1912                 else if (!strncmp(this_opt, "vbemode:", 8))
1913                         vbemode = simple_strtoul(this_opt + 8, NULL, 0);
1914                 else if (this_opt[0] >= '0' && this_opt[0] <= '9') {
1915                         mode_option = this_opt;
1916                 } else {
1917                         printk(KERN_WARNING
1918                                 "uvesafb: unrecognized option %s\n", this_opt);
1919                 }
1920         }
1921
1922         return 0;
1923 }
1924 #endif /* !MODULE */
1925
1926 static ssize_t show_v86d(struct device_driver *dev, char *buf)
1927 {
1928         return snprintf(buf, PAGE_SIZE, "%s\n", v86d_path);
1929 }
1930
1931 static ssize_t store_v86d(struct device_driver *dev, const char *buf,
1932                 size_t count)
1933 {
1934         strncpy(v86d_path, buf, PATH_MAX);
1935         return count;
1936 }
1937
1938 static DRIVER_ATTR(v86d, S_IRUGO | S_IWUSR, show_v86d, store_v86d);
1939
1940 static int __devinit uvesafb_init(void)
1941 {
1942         int err;
1943
1944 #ifndef MODULE
1945         char *option = NULL;
1946
1947         if (fb_get_options("uvesafb", &option))
1948                 return -ENODEV;
1949         uvesafb_setup(option);
1950 #endif
1951         err = cn_add_callback(&uvesafb_cn_id, "uvesafb", uvesafb_cn_callback);
1952         if (err)
1953                 return err;
1954
1955         err = platform_driver_register(&uvesafb_driver);
1956
1957         if (!err) {
1958                 uvesafb_device = platform_device_alloc("uvesafb", 0);
1959                 if (uvesafb_device)
1960                         err = platform_device_add(uvesafb_device);
1961                 else
1962                         err = -ENOMEM;
1963
1964                 if (err) {
1965                         platform_device_put(uvesafb_device);
1966                         platform_driver_unregister(&uvesafb_driver);
1967                         cn_del_callback(&uvesafb_cn_id);
1968                         return err;
1969                 }
1970
1971                 err = driver_create_file(&uvesafb_driver.driver,
1972                                 &driver_attr_v86d);
1973                 if (err) {
1974                         printk(KERN_WARNING "uvesafb: failed to register "
1975                                         "attributes\n");
1976                         err = 0;
1977                 }
1978         }
1979         return err;
1980 }
1981
1982 module_init(uvesafb_init);
1983
1984 static void __devexit uvesafb_exit(void)
1985 {
1986         struct uvesafb_ktask *task;
1987
1988         if (v86d_started) {
1989                 task = uvesafb_prep();
1990                 if (task) {
1991                         task->t.flags = TF_EXIT;
1992                         uvesafb_exec(task);
1993                         uvesafb_free(task);
1994                 }
1995         }
1996
1997         cn_del_callback(&uvesafb_cn_id);
1998         driver_remove_file(&uvesafb_driver.driver, &driver_attr_v86d);
1999         platform_device_unregister(uvesafb_device);
2000         platform_driver_unregister(&uvesafb_driver);
2001 }
2002
2003 module_exit(uvesafb_exit);
2004
2005 #define param_get_scroll NULL
2006 static int param_set_scroll(const char *val, struct kernel_param *kp)
2007 {
2008         ypan = 0;
2009
2010         if (!strcmp(val, "redraw"))
2011                 ypan = 0;
2012         else if (!strcmp(val, "ypan"))
2013                 ypan = 1;
2014         else if (!strcmp(val, "ywrap"))
2015                 ypan = 2;
2016         else
2017                 return -EINVAL;
2018
2019         return 0;
2020 }
2021
2022 #define param_check_scroll(name, p) __param_check(name, p, void)
2023
2024 module_param_named(scroll, ypan, scroll, 0);
2025 MODULE_PARM_DESC(scroll,
2026         "Scrolling mode, set to 'redraw', 'ypan', or 'ywrap'");
2027 module_param_named(vgapal, pmi_setpal, invbool, 0);
2028 MODULE_PARM_DESC(vgapal, "Set palette using VGA registers");
2029 module_param_named(pmipal, pmi_setpal, bool, 0);
2030 MODULE_PARM_DESC(pmipal, "Set palette using PMI calls");
2031 module_param(mtrr, uint, 0);
2032 MODULE_PARM_DESC(mtrr,
2033         "Memory Type Range Registers setting. Use 0 to disable.");
2034 module_param(blank, bool, 0);
2035 MODULE_PARM_DESC(blank, "Enable hardware blanking");
2036 module_param(nocrtc, bool, 0);
2037 MODULE_PARM_DESC(nocrtc, "Ignore CRTC timings when setting modes");
2038 module_param(noedid, bool, 0);
2039 MODULE_PARM_DESC(noedid,
2040         "Ignore EDID-provided monitor limits when setting modes");
2041 module_param(vram_remap, uint, 0);
2042 MODULE_PARM_DESC(vram_remap, "Set amount of video memory to be used [MiB]");
2043 module_param(vram_total, uint, 0);
2044 MODULE_PARM_DESC(vram_total, "Set total amount of video memoery [MiB]");
2045 module_param(maxclk, ushort, 0);
2046 MODULE_PARM_DESC(maxclk, "Maximum pixelclock [MHz], overrides EDID data");
2047 module_param(maxhf, ushort, 0);
2048 MODULE_PARM_DESC(maxhf,
2049         "Maximum horizontal frequency [kHz], overrides EDID data");
2050 module_param(maxvf, ushort, 0);
2051 MODULE_PARM_DESC(maxvf,
2052         "Maximum vertical frequency [Hz], overrides EDID data");
2053 module_param(mode_option, charp, 0);
2054 MODULE_PARM_DESC(mode_option,
2055         "Specify initial video mode as \"<xres>x<yres>[-<bpp>][@<refresh>]\"");
2056 module_param(vbemode, ushort, 0);
2057 MODULE_PARM_DESC(vbemode,
2058         "VBE mode number to set, overrides the 'mode' option");
2059 module_param_string(v86d, v86d_path, PATH_MAX, 0660);
2060 MODULE_PARM_DESC(v86d, "Path to the v86d userspace helper.");
2061
2062 MODULE_LICENSE("GPL");
2063 MODULE_AUTHOR("Michal Januszewski <spock@gentoo.org>");
2064 MODULE_DESCRIPTION("Framebuffer driver for VBE2.0+ compliant graphics boards");
2065