linux/drivers/video/uvesafb.c
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   1/*
   2 * A framebuffer driver for VBE 2.0+ compliant video cards
   3 *
   4 * (c) 2007 Michal Januszewski <spock@gentoo.org>
   5 *     Loosely based upon the vesafb driver.
   6 *
   7 */
   8#include <linux/init.h>
   9#include <linux/module.h>
  10#include <linux/moduleparam.h>
  11#include <linux/skbuff.h>
  12#include <linux/timer.h>
  13#include <linux/completion.h>
  14#include <linux/connector.h>
  15#include <linux/random.h>
  16#include <linux/platform_device.h>
  17#include <linux/limits.h>
  18#include <linux/fb.h>
  19#include <linux/io.h>
  20#include <linux/mutex.h>
  21#include <linux/slab.h>
  22#include <video/edid.h>
  23#include <video/uvesafb.h>
  24#ifdef CONFIG_X86
  25#include <video/vga.h>
  26#endif
  27#ifdef CONFIG_MTRR
  28#include <asm/mtrr.h>
  29#endif
  30#include "edid.h"
  31
  32static struct cb_id uvesafb_cn_id = {
  33        .idx = CN_IDX_V86D,
  34        .val = CN_VAL_V86D_UVESAFB
  35};
  36static char v86d_path[PATH_MAX] = "/sbin/v86d";
  37static char v86d_started;       /* has v86d been started by uvesafb? */
  38
  39static struct fb_fix_screeninfo uvesafb_fix __devinitdata = {
  40        .id     = "VESA VGA",
  41        .type   = FB_TYPE_PACKED_PIXELS,
  42        .accel  = FB_ACCEL_NONE,
  43        .visual = FB_VISUAL_TRUECOLOR,
  44};
  45
  46static int mtrr         __devinitdata = 3; /* enable mtrr by default */
  47static bool blank       = 1;               /* enable blanking by default */
  48static int ypan         = 1;             /* 0: scroll, 1: ypan, 2: ywrap */
  49static bool pmi_setpal  __devinitdata = true; /* use PMI for palette changes */
  50static bool nocrtc      __devinitdata; /* ignore CRTC settings */
  51static bool noedid      __devinitdata; /* don't try DDC transfers */
  52static int vram_remap   __devinitdata; /* set amt. of memory to be used */
  53static int vram_total   __devinitdata; /* set total amount of memory */
  54static u16 maxclk       __devinitdata; /* maximum pixel clock */
  55static u16 maxvf        __devinitdata; /* maximum vertical frequency */
  56static u16 maxhf        __devinitdata; /* maximum horizontal frequency */
  57static u16 vbemode      __devinitdata; /* force use of a specific VBE mode */
  58static char *mode_option __devinitdata;
  59static u8  dac_width    = 6;
  60
  61static struct uvesafb_ktask *uvfb_tasks[UVESAFB_TASKS_MAX];
  62static DEFINE_MUTEX(uvfb_lock);
  63
  64/*
  65 * A handler for replies from userspace.
  66 *
  67 * Make sure each message passes consistency checks and if it does,
  68 * find the kernel part of the task struct, copy the registers and
  69 * the buffer contents and then complete the task.
  70 */
  71static void uvesafb_cn_callback(struct cn_msg *msg, struct netlink_skb_parms *nsp)
  72{
  73        struct uvesafb_task *utask;
  74        struct uvesafb_ktask *task;
  75
  76        if (!capable(CAP_SYS_ADMIN))
  77                return;
  78
  79        if (msg->seq >= UVESAFB_TASKS_MAX)
  80                return;
  81
  82        mutex_lock(&uvfb_lock);
  83        task = uvfb_tasks[msg->seq];
  84
  85        if (!task || msg->ack != task->ack) {
  86                mutex_unlock(&uvfb_lock);
  87                return;
  88        }
  89
  90        utask = (struct uvesafb_task *)msg->data;
  91
  92        /* Sanity checks for the buffer length. */
  93        if (task->t.buf_len < utask->buf_len ||
  94            utask->buf_len > msg->len - sizeof(*utask)) {
  95                mutex_unlock(&uvfb_lock);
  96                return;
  97        }
  98
  99        uvfb_tasks[msg->seq] = NULL;
 100        mutex_unlock(&uvfb_lock);
 101
 102        memcpy(&task->t, utask, sizeof(*utask));
 103
 104        if (task->t.buf_len && task->buf)
 105                memcpy(task->buf, utask + 1, task->t.buf_len);
 106
 107        complete(task->done);
 108        return;
 109}
 110
 111static int uvesafb_helper_start(void)
 112{
 113        char *envp[] = {
 114                "HOME=/",
 115                "PATH=/sbin:/bin",
 116                NULL,
 117        };
 118
 119        char *argv[] = {
 120                v86d_path,
 121                NULL,
 122        };
 123
 124        return call_usermodehelper(v86d_path, argv, envp, UMH_WAIT_PROC);
 125}
 126
 127/*
 128 * Execute a uvesafb task.
 129 *
 130 * Returns 0 if the task is executed successfully.
 131 *
 132 * A message sent to the userspace consists of the uvesafb_task
 133 * struct and (optionally) a buffer. The uvesafb_task struct is
 134 * a simplified version of uvesafb_ktask (its kernel counterpart)
 135 * containing only the register values, flags and the length of
 136 * the buffer.
 137 *
 138 * Each message is assigned a sequence number (increased linearly)
 139 * and a random ack number. The sequence number is used as a key
 140 * for the uvfb_tasks array which holds pointers to uvesafb_ktask
 141 * structs for all requests.
 142 */
 143static int uvesafb_exec(struct uvesafb_ktask *task)
 144{
 145        static int seq;
 146        struct cn_msg *m;
 147        int err;
 148        int len = sizeof(task->t) + task->t.buf_len;
 149
 150        /*
 151         * Check whether the message isn't longer than the maximum
 152         * allowed by connector.
 153         */
 154        if (sizeof(*m) + len > CONNECTOR_MAX_MSG_SIZE) {
 155                printk(KERN_WARNING "uvesafb: message too long (%d), "
 156                        "can't execute task\n", (int)(sizeof(*m) + len));
 157                return -E2BIG;
 158        }
 159
 160        m = kzalloc(sizeof(*m) + len, GFP_KERNEL);
 161        if (!m)
 162                return -ENOMEM;
 163
 164        init_completion(task->done);
 165
 166        memcpy(&m->id, &uvesafb_cn_id, sizeof(m->id));
 167        m->seq = seq;
 168        m->len = len;
 169        m->ack = random32();
 170
 171        /* uvesafb_task structure */
 172        memcpy(m + 1, &task->t, sizeof(task->t));
 173
 174        /* Buffer */
 175        memcpy((u8 *)(m + 1) + sizeof(task->t), task->buf, task->t.buf_len);
 176
 177        /*
 178         * Save the message ack number so that we can find the kernel
 179         * part of this task when a reply is received from userspace.
 180         */
 181        task->ack = m->ack;
 182
 183        mutex_lock(&uvfb_lock);
 184
 185        /* If all slots are taken -- bail out. */
 186        if (uvfb_tasks[seq]) {
 187                mutex_unlock(&uvfb_lock);
 188                err = -EBUSY;
 189                goto out;
 190        }
 191
 192        /* Save a pointer to the kernel part of the task struct. */
 193        uvfb_tasks[seq] = task;
 194        mutex_unlock(&uvfb_lock);
 195
 196        err = cn_netlink_send(m, 0, GFP_KERNEL);
 197        if (err == -ESRCH) {
 198                /*
 199                 * Try to start the userspace helper if sending
 200                 * the request failed the first time.
 201                 */
 202                err = uvesafb_helper_start();
 203                if (err) {
 204                        printk(KERN_ERR "uvesafb: failed to execute %s\n",
 205                                        v86d_path);
 206                        printk(KERN_ERR "uvesafb: make sure that the v86d "
 207                                        "helper is installed and executable\n");
 208                } else {
 209                        v86d_started = 1;
 210                        err = cn_netlink_send(m, 0, gfp_any());
 211                        if (err == -ENOBUFS)
 212                                err = 0;
 213                }
 214        } else if (err == -ENOBUFS)
 215                err = 0;
 216
 217        if (!err && !(task->t.flags & TF_EXIT))
 218                err = !wait_for_completion_timeout(task->done,
 219                                msecs_to_jiffies(UVESAFB_TIMEOUT));
 220
 221        mutex_lock(&uvfb_lock);
 222        uvfb_tasks[seq] = NULL;
 223        mutex_unlock(&uvfb_lock);
 224
 225        seq++;
 226        if (seq >= UVESAFB_TASKS_MAX)
 227                seq = 0;
 228out:
 229        kfree(m);
 230        return err;
 231}
 232
 233/*
 234 * Free a uvesafb_ktask struct.
 235 */
 236static void uvesafb_free(struct uvesafb_ktask *task)
 237{
 238        if (task) {
 239                if (task->done)
 240                        kfree(task->done);
 241                kfree(task);
 242        }
 243}
 244
 245/*
 246 * Prepare a uvesafb_ktask struct to be used again.
 247 */
 248static void uvesafb_reset(struct uvesafb_ktask *task)
 249{
 250        struct completion *cpl = task->done;
 251
 252        memset(task, 0, sizeof(*task));
 253        task->done = cpl;
 254}
 255
 256/*
 257 * Allocate and prepare a uvesafb_ktask struct.
 258 */
 259static struct uvesafb_ktask *uvesafb_prep(void)
 260{
 261        struct uvesafb_ktask *task;
 262
 263        task = kzalloc(sizeof(*task), GFP_KERNEL);
 264        if (task) {
 265                task->done = kzalloc(sizeof(*task->done), GFP_KERNEL);
 266                if (!task->done) {
 267                        kfree(task);
 268                        task = NULL;
 269                }
 270        }
 271        return task;
 272}
 273
 274static void uvesafb_setup_var(struct fb_var_screeninfo *var,
 275                struct fb_info *info, struct vbe_mode_ib *mode)
 276{
 277        struct uvesafb_par *par = info->par;
 278
 279        var->vmode = FB_VMODE_NONINTERLACED;
 280        var->sync = FB_SYNC_VERT_HIGH_ACT;
 281
 282        var->xres = mode->x_res;
 283        var->yres = mode->y_res;
 284        var->xres_virtual = mode->x_res;
 285        var->yres_virtual = (par->ypan) ?
 286                        info->fix.smem_len / mode->bytes_per_scan_line :
 287                        mode->y_res;
 288        var->xoffset = 0;
 289        var->yoffset = 0;
 290        var->bits_per_pixel = mode->bits_per_pixel;
 291
 292        if (var->bits_per_pixel == 15)
 293                var->bits_per_pixel = 16;
 294
 295        if (var->bits_per_pixel > 8) {
 296                var->red.offset    = mode->red_off;
 297                var->red.length    = mode->red_len;
 298                var->green.offset  = mode->green_off;
 299                var->green.length  = mode->green_len;
 300                var->blue.offset   = mode->blue_off;
 301                var->blue.length   = mode->blue_len;
 302                var->transp.offset = mode->rsvd_off;
 303                var->transp.length = mode->rsvd_len;
 304        } else {
 305                var->red.offset    = 0;
 306                var->green.offset  = 0;
 307                var->blue.offset   = 0;
 308                var->transp.offset = 0;
 309
 310                var->red.length    = 8;
 311                var->green.length  = 8;
 312                var->blue.length   = 8;
 313                var->transp.length = 0;
 314        }
 315}
 316
 317static int uvesafb_vbe_find_mode(struct uvesafb_par *par,
 318                int xres, int yres, int depth, unsigned char flags)
 319{
 320        int i, match = -1, h = 0, d = 0x7fffffff;
 321
 322        for (i = 0; i < par->vbe_modes_cnt; i++) {
 323                h = abs(par->vbe_modes[i].x_res - xres) +
 324                    abs(par->vbe_modes[i].y_res - yres) +
 325                    abs(depth - par->vbe_modes[i].depth);
 326
 327                /*
 328                 * We have an exact match in terms of resolution
 329                 * and depth.
 330                 */
 331                if (h == 0)
 332                        return i;
 333
 334                if (h < d || (h == d && par->vbe_modes[i].depth > depth)) {
 335                        d = h;
 336                        match = i;
 337                }
 338        }
 339        i = 1;
 340
 341        if (flags & UVESAFB_EXACT_DEPTH &&
 342                        par->vbe_modes[match].depth != depth)
 343                i = 0;
 344
 345        if (flags & UVESAFB_EXACT_RES && d > 24)
 346                i = 0;
 347
 348        if (i != 0)
 349                return match;
 350        else
 351                return -1;
 352}
 353
 354static u8 *uvesafb_vbe_state_save(struct uvesafb_par *par)
 355{
 356        struct uvesafb_ktask *task;
 357        u8 *state;
 358        int err;
 359
 360        if (!par->vbe_state_size)
 361                return NULL;
 362
 363        state = kmalloc(par->vbe_state_size, GFP_KERNEL);
 364        if (!state)
 365                return ERR_PTR(-ENOMEM);
 366
 367        task = uvesafb_prep();
 368        if (!task) {
 369                kfree(state);
 370                return NULL;
 371        }
 372
 373        task->t.regs.eax = 0x4f04;
 374        task->t.regs.ecx = 0x000f;
 375        task->t.regs.edx = 0x0001;
 376        task->t.flags = TF_BUF_RET | TF_BUF_ESBX;
 377        task->t.buf_len = par->vbe_state_size;
 378        task->buf = state;
 379        err = uvesafb_exec(task);
 380
 381        if (err || (task->t.regs.eax & 0xffff) != 0x004f) {
 382                printk(KERN_WARNING "uvesafb: VBE get state call "
 383                                "failed (eax=0x%x, err=%d)\n",
 384                                task->t.regs.eax, err);
 385                kfree(state);
 386                state = NULL;
 387        }
 388
 389        uvesafb_free(task);
 390        return state;
 391}
 392
 393static void uvesafb_vbe_state_restore(struct uvesafb_par *par, u8 *state_buf)
 394{
 395        struct uvesafb_ktask *task;
 396        int err;
 397
 398        if (!state_buf)
 399                return;
 400
 401        task = uvesafb_prep();
 402        if (!task)
 403                return;
 404
 405        task->t.regs.eax = 0x4f04;
 406        task->t.regs.ecx = 0x000f;
 407        task->t.regs.edx = 0x0002;
 408        task->t.buf_len = par->vbe_state_size;
 409        task->t.flags = TF_BUF_ESBX;
 410        task->buf = state_buf;
 411
 412        err = uvesafb_exec(task);
 413        if (err || (task->t.regs.eax & 0xffff) != 0x004f)
 414                printk(KERN_WARNING "uvesafb: VBE state restore call "
 415                                "failed (eax=0x%x, err=%d)\n",
 416                                task->t.regs.eax, err);
 417
 418        uvesafb_free(task);
 419}
 420
 421static int __devinit uvesafb_vbe_getinfo(struct uvesafb_ktask *task,
 422                struct uvesafb_par *par)
 423{
 424        int err;
 425
 426        task->t.regs.eax = 0x4f00;
 427        task->t.flags = TF_VBEIB;
 428        task->t.buf_len = sizeof(struct vbe_ib);
 429        task->buf = &par->vbe_ib;
 430        strncpy(par->vbe_ib.vbe_signature, "VBE2", 4);
 431
 432        err = uvesafb_exec(task);
 433        if (err || (task->t.regs.eax & 0xffff) != 0x004f) {
 434                printk(KERN_ERR "uvesafb: Getting VBE info block failed "
 435                                "(eax=0x%x, err=%d)\n", (u32)task->t.regs.eax,
 436                                err);
 437                return -EINVAL;
 438        }
 439
 440        if (par->vbe_ib.vbe_version < 0x0200) {
 441                printk(KERN_ERR "uvesafb: Sorry, pre-VBE 2.0 cards are "
 442                                "not supported.\n");
 443                return -EINVAL;
 444        }
 445
 446        if (!par->vbe_ib.mode_list_ptr) {
 447                printk(KERN_ERR "uvesafb: Missing mode list!\n");
 448                return -EINVAL;
 449        }
 450
 451        printk(KERN_INFO "uvesafb: ");
 452
 453        /*
 454         * Convert string pointers and the mode list pointer into
 455         * usable addresses. Print informational messages about the
 456         * video adapter and its vendor.
 457         */
 458        if (par->vbe_ib.oem_vendor_name_ptr)
 459                printk("%s, ",
 460                        ((char *)task->buf) + par->vbe_ib.oem_vendor_name_ptr);
 461
 462        if (par->vbe_ib.oem_product_name_ptr)
 463                printk("%s, ",
 464                        ((char *)task->buf) + par->vbe_ib.oem_product_name_ptr);
 465
 466        if (par->vbe_ib.oem_product_rev_ptr)
 467                printk("%s, ",
 468                        ((char *)task->buf) + par->vbe_ib.oem_product_rev_ptr);
 469
 470        if (par->vbe_ib.oem_string_ptr)
 471                printk("OEM: %s, ",
 472                        ((char *)task->buf) + par->vbe_ib.oem_string_ptr);
 473
 474        printk("VBE v%d.%d\n", ((par->vbe_ib.vbe_version & 0xff00) >> 8),
 475                        par->vbe_ib.vbe_version & 0xff);
 476
 477        return 0;
 478}
 479
 480static int __devinit uvesafb_vbe_getmodes(struct uvesafb_ktask *task,
 481                struct uvesafb_par *par)
 482{
 483        int off = 0, err;
 484        u16 *mode;
 485
 486        par->vbe_modes_cnt = 0;
 487
 488        /* Count available modes. */
 489        mode = (u16 *) (((u8 *)&par->vbe_ib) + par->vbe_ib.mode_list_ptr);
 490        while (*mode != 0xffff) {
 491                par->vbe_modes_cnt++;
 492                mode++;
 493        }
 494
 495        par->vbe_modes = kzalloc(sizeof(struct vbe_mode_ib) *
 496                                par->vbe_modes_cnt, GFP_KERNEL);
 497        if (!par->vbe_modes)
 498                return -ENOMEM;
 499
 500        /* Get info about all available modes. */
 501        mode = (u16 *) (((u8 *)&par->vbe_ib) + par->vbe_ib.mode_list_ptr);
 502        while (*mode != 0xffff) {
 503                struct vbe_mode_ib *mib;
 504
 505                uvesafb_reset(task);
 506                task->t.regs.eax = 0x4f01;
 507                task->t.regs.ecx = (u32) *mode;
 508                task->t.flags = TF_BUF_RET | TF_BUF_ESDI;
 509                task->t.buf_len = sizeof(struct vbe_mode_ib);
 510                task->buf = par->vbe_modes + off;
 511
 512                err = uvesafb_exec(task);
 513                if (err || (task->t.regs.eax & 0xffff) != 0x004f) {
 514                        printk(KERN_WARNING "uvesafb: Getting mode info block "
 515                                "for mode 0x%x failed (eax=0x%x, err=%d)\n",
 516                                *mode, (u32)task->t.regs.eax, err);
 517                        mode++;
 518                        par->vbe_modes_cnt--;
 519                        continue;
 520                }
 521
 522                mib = task->buf;
 523                mib->mode_id = *mode;
 524
 525                /*
 526                 * We only want modes that are supported with the current
 527                 * hardware configuration, color, graphics and that have
 528                 * support for the LFB.
 529                 */
 530                if ((mib->mode_attr & VBE_MODE_MASK) == VBE_MODE_MASK &&
 531                                 mib->bits_per_pixel >= 8)
 532                        off++;
 533                else
 534                        par->vbe_modes_cnt--;
 535
 536                mode++;
 537                mib->depth = mib->red_len + mib->green_len + mib->blue_len;
 538
 539                /*
 540                 * Handle 8bpp modes and modes with broken color component
 541                 * lengths.
 542                 */
 543                if (mib->depth == 0 || (mib->depth == 24 &&
 544                                        mib->bits_per_pixel == 32))
 545                        mib->depth = mib->bits_per_pixel;
 546        }
 547
 548        if (par->vbe_modes_cnt > 0)
 549                return 0;
 550        else
 551                return -EINVAL;
 552}
 553
 554/*
 555 * The Protected Mode Interface is 32-bit x86 code, so we only run it on
 556 * x86 and not x86_64.
 557 */
 558#ifdef CONFIG_X86_32
 559static int __devinit uvesafb_vbe_getpmi(struct uvesafb_ktask *task,
 560                struct uvesafb_par *par)
 561{
 562        int i, err;
 563
 564        uvesafb_reset(task);
 565        task->t.regs.eax = 0x4f0a;
 566        task->t.regs.ebx = 0x0;
 567        err = uvesafb_exec(task);
 568
 569        if ((task->t.regs.eax & 0xffff) != 0x4f || task->t.regs.es < 0xc000) {
 570                par->pmi_setpal = par->ypan = 0;
 571        } else {
 572                par->pmi_base = (u16 *)phys_to_virt(((u32)task->t.regs.es << 4)
 573                                                + task->t.regs.edi);
 574                par->pmi_start = (u8 *)par->pmi_base + par->pmi_base[1];
 575                par->pmi_pal = (u8 *)par->pmi_base + par->pmi_base[2];
 576                printk(KERN_INFO "uvesafb: protected mode interface info at "
 577                                 "%04x:%04x\n",
 578                                 (u16)task->t.regs.es, (u16)task->t.regs.edi);
 579                printk(KERN_INFO "uvesafb: pmi: set display start = %p, "
 580                                 "set palette = %p\n", par->pmi_start,
 581                                 par->pmi_pal);
 582
 583                if (par->pmi_base[3]) {
 584                        printk(KERN_INFO "uvesafb: pmi: ports = ");
 585                        for (i = par->pmi_base[3]/2;
 586                                        par->pmi_base[i] != 0xffff; i++)
 587                                printk("%x ", par->pmi_base[i]);
 588                        printk("\n");
 589
 590                        if (par->pmi_base[i] != 0xffff) {
 591                                printk(KERN_INFO "uvesafb: can't handle memory"
 592                                                 " requests, pmi disabled\n");
 593                                par->ypan = par->pmi_setpal = 0;
 594                        }
 595                }
 596        }
 597        return 0;
 598}
 599#endif /* CONFIG_X86_32 */
 600
 601/*
 602 * Check whether a video mode is supported by the Video BIOS and is
 603 * compatible with the monitor limits.
 604 */
 605static int __devinit uvesafb_is_valid_mode(struct fb_videomode *mode,
 606                struct fb_info *info)
 607{
 608        if (info->monspecs.gtf) {
 609                fb_videomode_to_var(&info->var, mode);
 610                if (fb_validate_mode(&info->var, info))
 611                        return 0;
 612        }
 613
 614        if (uvesafb_vbe_find_mode(info->par, mode->xres, mode->yres, 8,
 615                                UVESAFB_EXACT_RES) == -1)
 616                return 0;
 617
 618        return 1;
 619}
 620
 621static int __devinit uvesafb_vbe_getedid(struct uvesafb_ktask *task,
 622                struct fb_info *info)
 623{
 624        struct uvesafb_par *par = info->par;
 625        int err = 0;
 626
 627        if (noedid || par->vbe_ib.vbe_version < 0x0300)
 628                return -EINVAL;
 629
 630        task->t.regs.eax = 0x4f15;
 631        task->t.regs.ebx = 0;
 632        task->t.regs.ecx = 0;
 633        task->t.buf_len = 0;
 634        task->t.flags = 0;
 635
 636        err = uvesafb_exec(task);
 637
 638        if ((task->t.regs.eax & 0xffff) != 0x004f || err)
 639                return -EINVAL;
 640
 641        if ((task->t.regs.ebx & 0x3) == 3) {
 642                printk(KERN_INFO "uvesafb: VBIOS/hardware supports both "
 643                                 "DDC1 and DDC2 transfers\n");
 644        } else if ((task->t.regs.ebx & 0x3) == 2) {
 645                printk(KERN_INFO "uvesafb: VBIOS/hardware supports DDC2 "
 646                                 "transfers\n");
 647        } else if ((task->t.regs.ebx & 0x3) == 1) {
 648                printk(KERN_INFO "uvesafb: VBIOS/hardware supports DDC1 "
 649                                 "transfers\n");
 650        } else {
 651                printk(KERN_INFO "uvesafb: VBIOS/hardware doesn't support "
 652                                 "DDC transfers\n");
 653                return -EINVAL;
 654        }
 655
 656        task->t.regs.eax = 0x4f15;
 657        task->t.regs.ebx = 1;
 658        task->t.regs.ecx = task->t.regs.edx = 0;
 659        task->t.flags = TF_BUF_RET | TF_BUF_ESDI;
 660        task->t.buf_len = EDID_LENGTH;
 661        task->buf = kzalloc(EDID_LENGTH, GFP_KERNEL);
 662        if (!task->buf)
 663                return -ENOMEM;
 664
 665        err = uvesafb_exec(task);
 666
 667        if ((task->t.regs.eax & 0xffff) == 0x004f && !err) {
 668                fb_edid_to_monspecs(task->buf, &info->monspecs);
 669
 670                if (info->monspecs.vfmax && info->monspecs.hfmax) {
 671                        /*
 672                         * If the maximum pixel clock wasn't specified in
 673                         * the EDID block, set it to 300 MHz.
 674                         */
 675                        if (info->monspecs.dclkmax == 0)
 676                                info->monspecs.dclkmax = 300 * 1000000;
 677                        info->monspecs.gtf = 1;
 678                }
 679        } else {
 680                err = -EINVAL;
 681        }
 682
 683        kfree(task->buf);
 684        return err;
 685}
 686
 687static void __devinit uvesafb_vbe_getmonspecs(struct uvesafb_ktask *task,
 688                struct fb_info *info)
 689{
 690        struct uvesafb_par *par = info->par;
 691        int i;
 692
 693        memset(&info->monspecs, 0, sizeof(info->monspecs));
 694
 695        /*
 696         * If we don't get all necessary data from the EDID block,
 697         * mark it as incompatible with the GTF and set nocrtc so
 698         * that we always use the default BIOS refresh rate.
 699         */
 700        if (uvesafb_vbe_getedid(task, info)) {
 701                info->monspecs.gtf = 0;
 702                par->nocrtc = 1;
 703        }
 704
 705        /* Kernel command line overrides. */
 706        if (maxclk)
 707                info->monspecs.dclkmax = maxclk * 1000000;
 708        if (maxvf)
 709                info->monspecs.vfmax = maxvf;
 710        if (maxhf)
 711                info->monspecs.hfmax = maxhf * 1000;
 712
 713        /*
 714         * In case DDC transfers are not supported, the user can provide
 715         * monitor limits manually. Lower limits are set to "safe" values.
 716         */
 717        if (info->monspecs.gtf == 0 && maxclk && maxvf && maxhf) {
 718                info->monspecs.dclkmin = 0;
 719                info->monspecs.vfmin = 60;
 720                info->monspecs.hfmin = 29000;
 721                info->monspecs.gtf = 1;
 722                par->nocrtc = 0;
 723        }
 724
 725        if (info->monspecs.gtf)
 726                printk(KERN_INFO
 727                        "uvesafb: monitor limits: vf = %d Hz, hf = %d kHz, "
 728                        "clk = %d MHz\n", info->monspecs.vfmax,
 729                        (int)(info->monspecs.hfmax / 1000),
 730                        (int)(info->monspecs.dclkmax / 1000000));
 731        else
 732                printk(KERN_INFO "uvesafb: no monitor limits have been set, "
 733                                 "default refresh rate will be used\n");
 734
 735        /* Add VBE modes to the modelist. */
 736        for (i = 0; i < par->vbe_modes_cnt; i++) {
 737                struct fb_var_screeninfo var;
 738                struct vbe_mode_ib *mode;
 739                struct fb_videomode vmode;
 740
 741                mode = &par->vbe_modes[i];
 742                memset(&var, 0, sizeof(var));
 743
 744                var.xres = mode->x_res;
 745                var.yres = mode->y_res;
 746
 747                fb_get_mode(FB_VSYNCTIMINGS | FB_IGNOREMON, 60, &var, info);
 748                fb_var_to_videomode(&vmode, &var);
 749                fb_add_videomode(&vmode, &info->modelist);
 750        }
 751
 752        /* Add valid VESA modes to our modelist. */
 753        for (i = 0; i < VESA_MODEDB_SIZE; i++) {
 754                if (uvesafb_is_valid_mode((struct fb_videomode *)
 755                                                &vesa_modes[i], info))
 756                        fb_add_videomode(&vesa_modes[i], &info->modelist);
 757        }
 758
 759        for (i = 0; i < info->monspecs.modedb_len; i++) {
 760                if (uvesafb_is_valid_mode(&info->monspecs.modedb[i], info))
 761                        fb_add_videomode(&info->monspecs.modedb[i],
 762                                        &info->modelist);
 763        }
 764
 765        return;
 766}
 767
 768static void __devinit uvesafb_vbe_getstatesize(struct uvesafb_ktask *task,
 769                struct uvesafb_par *par)
 770{
 771        int err;
 772
 773        uvesafb_reset(task);
 774
 775        /*
 776         * Get the VBE state buffer size. We want all available
 777         * hardware state data (CL = 0x0f).
 778         */
 779        task->t.regs.eax = 0x4f04;
 780        task->t.regs.ecx = 0x000f;
 781        task->t.regs.edx = 0x0000;
 782        task->t.flags = 0;
 783
 784        err = uvesafb_exec(task);
 785
 786        if (err || (task->t.regs.eax & 0xffff) != 0x004f) {
 787                printk(KERN_WARNING "uvesafb: VBE state buffer size "
 788                        "cannot be determined (eax=0x%x, err=%d)\n",
 789                        task->t.regs.eax, err);
 790                par->vbe_state_size = 0;
 791                return;
 792        }
 793
 794        par->vbe_state_size = 64 * (task->t.regs.ebx & 0xffff);
 795}
 796
 797static int __devinit uvesafb_vbe_init(struct fb_info *info)
 798{
 799        struct uvesafb_ktask *task = NULL;
 800        struct uvesafb_par *par = info->par;
 801        int err;
 802
 803        task = uvesafb_prep();
 804        if (!task)
 805                return -ENOMEM;
 806
 807        err = uvesafb_vbe_getinfo(task, par);
 808        if (err)
 809                goto out;
 810
 811        err = uvesafb_vbe_getmodes(task, par);
 812        if (err)
 813                goto out;
 814
 815        par->nocrtc = nocrtc;
 816#ifdef CONFIG_X86_32
 817        par->pmi_setpal = pmi_setpal;
 818        par->ypan = ypan;
 819
 820        if (par->pmi_setpal || par->ypan) {
 821                if (__supported_pte_mask & _PAGE_NX) {
 822                        par->pmi_setpal = par->ypan = 0;
 823                        printk(KERN_WARNING "uvesafb: NX protection is actively."
 824                                "We have better not to use the PMI.\n");
 825                } else {
 826                        uvesafb_vbe_getpmi(task, par);
 827                }
 828        }
 829#else
 830        /* The protected mode interface is not available on non-x86. */
 831        par->pmi_setpal = par->ypan = 0;
 832#endif
 833
 834        INIT_LIST_HEAD(&info->modelist);
 835        uvesafb_vbe_getmonspecs(task, info);
 836        uvesafb_vbe_getstatesize(task, par);
 837
 838out:    uvesafb_free(task);
 839        return err;
 840}
 841
 842static int __devinit uvesafb_vbe_init_mode(struct fb_info *info)
 843{
 844        struct list_head *pos;
 845        struct fb_modelist *modelist;
 846        struct fb_videomode *mode;
 847        struct uvesafb_par *par = info->par;
 848        int i, modeid;
 849
 850        /* Has the user requested a specific VESA mode? */
 851        if (vbemode) {
 852                for (i = 0; i < par->vbe_modes_cnt; i++) {
 853                        if (par->vbe_modes[i].mode_id == vbemode) {
 854                                modeid = i;
 855                                uvesafb_setup_var(&info->var, info,
 856                                                &par->vbe_modes[modeid]);
 857                                fb_get_mode(FB_VSYNCTIMINGS | FB_IGNOREMON, 60,
 858                                                &info->var, info);
 859                                /*
 860                                 * With pixclock set to 0, the default BIOS
 861                                 * timings will be used in set_par().
 862                                 */
 863                                info->var.pixclock = 0;
 864                                goto gotmode;
 865                        }
 866                }
 867                printk(KERN_INFO "uvesafb: requested VBE mode 0x%x is "
 868                                 "unavailable\n", vbemode);
 869                vbemode = 0;
 870        }
 871
 872        /* Count the modes in the modelist */
 873        i = 0;
 874        list_for_each(pos, &info->modelist)
 875                i++;
 876
 877        /*
 878         * Convert the modelist into a modedb so that we can use it with
 879         * fb_find_mode().
 880         */
 881        mode = kzalloc(i * sizeof(*mode), GFP_KERNEL);
 882        if (mode) {
 883                i = 0;
 884                list_for_each(pos, &info->modelist) {
 885                        modelist = list_entry(pos, struct fb_modelist, list);
 886                        mode[i] = modelist->mode;
 887                        i++;
 888                }
 889
 890                if (!mode_option)
 891                        mode_option = UVESAFB_DEFAULT_MODE;
 892
 893                i = fb_find_mode(&info->var, info, mode_option, mode, i,
 894                        NULL, 8);
 895
 896                kfree(mode);
 897        }
 898
 899        /* fb_find_mode() failed */
 900        if (i == 0) {
 901                info->var.xres = 640;
 902                info->var.yres = 480;
 903                mode = (struct fb_videomode *)
 904                                fb_find_best_mode(&info->var, &info->modelist);
 905
 906                if (mode) {
 907                        fb_videomode_to_var(&info->var, mode);
 908                } else {
 909                        modeid = par->vbe_modes[0].mode_id;
 910                        uvesafb_setup_var(&info->var, info,
 911                                        &par->vbe_modes[modeid]);
 912                        fb_get_mode(FB_VSYNCTIMINGS | FB_IGNOREMON, 60,
 913                                        &info->var, info);
 914
 915                        goto gotmode;
 916                }
 917        }
 918
 919        /* Look for a matching VBE mode. */
 920        modeid = uvesafb_vbe_find_mode(par, info->var.xres, info->var.yres,
 921                        info->var.bits_per_pixel, UVESAFB_EXACT_RES);
 922
 923        if (modeid == -1)
 924                return -EINVAL;
 925
 926        uvesafb_setup_var(&info->var, info, &par->vbe_modes[modeid]);
 927
 928gotmode:
 929        /*
 930         * If we are not VBE3.0+ compliant, we're done -- the BIOS will
 931         * ignore our timings anyway.
 932         */
 933        if (par->vbe_ib.vbe_version < 0x0300 || par->nocrtc)
 934                fb_get_mode(FB_VSYNCTIMINGS | FB_IGNOREMON, 60,
 935                                        &info->var, info);
 936
 937        return modeid;
 938}
 939
 940static int uvesafb_setpalette(struct uvesafb_pal_entry *entries, int count,
 941                int start, struct fb_info *info)
 942{
 943        struct uvesafb_ktask *task;
 944#ifdef CONFIG_X86
 945        struct uvesafb_par *par = info->par;
 946        int i = par->mode_idx;
 947#endif
 948        int err = 0;
 949
 950        /*
 951         * We support palette modifications for 8 bpp modes only, so
 952         * there can never be more than 256 entries.
 953         */
 954        if (start + count > 256)
 955                return -EINVAL;
 956
 957#ifdef CONFIG_X86
 958        /* Use VGA registers if mode is VGA-compatible. */
 959        if (i >= 0 && i < par->vbe_modes_cnt &&
 960            par->vbe_modes[i].mode_attr & VBE_MODE_VGACOMPAT) {
 961                for (i = 0; i < count; i++) {
 962                        outb_p(start + i,        dac_reg);
 963                        outb_p(entries[i].red,   dac_val);
 964                        outb_p(entries[i].green, dac_val);
 965                        outb_p(entries[i].blue,  dac_val);
 966                }
 967        }
 968#ifdef CONFIG_X86_32
 969        else if (par->pmi_setpal) {
 970                __asm__ __volatile__(
 971                "call *(%%esi)"
 972                : /* no return value */
 973                : "a" (0x4f09),         /* EAX */
 974                  "b" (0),              /* EBX */
 975                  "c" (count),          /* ECX */
 976                  "d" (start),          /* EDX */
 977                  "D" (entries),        /* EDI */
 978                  "S" (&par->pmi_pal)); /* ESI */
 979        }
 980#endif /* CONFIG_X86_32 */
 981        else
 982#endif /* CONFIG_X86 */
 983        {
 984                task = uvesafb_prep();
 985                if (!task)
 986                        return -ENOMEM;
 987
 988                task->t.regs.eax = 0x4f09;
 989                task->t.regs.ebx = 0x0;
 990                task->t.regs.ecx = count;
 991                task->t.regs.edx = start;
 992                task->t.flags = TF_BUF_ESDI;
 993                task->t.buf_len = sizeof(struct uvesafb_pal_entry) * count;
 994                task->buf = entries;
 995
 996                err = uvesafb_exec(task);
 997                if ((task->t.regs.eax & 0xffff) != 0x004f)
 998                        err = 1;
 999
1000                uvesafb_free(task);
1001        }
1002        return err;
1003}
1004
1005static int uvesafb_setcolreg(unsigned regno, unsigned red, unsigned green,
1006                unsigned blue, unsigned transp,
1007                struct fb_info *info)
1008{
1009        struct uvesafb_pal_entry entry;
1010        int shift = 16 - dac_width;
1011        int err = 0;
1012
1013        if (regno >= info->cmap.len)
1014                return -EINVAL;
1015
1016        if (info->var.bits_per_pixel == 8) {
1017                entry.red   = red   >> shift;
1018                entry.green = green >> shift;
1019                entry.blue  = blue  >> shift;
1020                entry.pad   = 0;
1021
1022                err = uvesafb_setpalette(&entry, 1, regno, info);
1023        } else if (regno < 16) {
1024                switch (info->var.bits_per_pixel) {
1025                case 16:
1026                        if (info->var.red.offset == 10) {
1027                                /* 1:5:5:5 */
1028                                ((u32 *) (info->pseudo_palette))[regno] =
1029                                                ((red   & 0xf800) >>  1) |
1030                                                ((green & 0xf800) >>  6) |
1031                                                ((blue  & 0xf800) >> 11);
1032                        } else {
1033                                /* 0:5:6:5 */
1034                                ((u32 *) (info->pseudo_palette))[regno] =
1035                                                ((red   & 0xf800)      ) |
1036                                                ((green & 0xfc00) >>  5) |
1037                                                ((blue  & 0xf800) >> 11);
1038                        }
1039                        break;
1040
1041                case 24:
1042                case 32:
1043                        red   >>= 8;
1044                        green >>= 8;
1045                        blue  >>= 8;
1046                        ((u32 *)(info->pseudo_palette))[regno] =
1047                                (red   << info->var.red.offset)   |
1048                                (green << info->var.green.offset) |
1049                                (blue  << info->var.blue.offset);
1050                        break;
1051                }
1052        }
1053        return err;
1054}
1055
1056static int uvesafb_setcmap(struct fb_cmap *cmap, struct fb_info *info)
1057{
1058        struct uvesafb_pal_entry *entries;
1059        int shift = 16 - dac_width;
1060        int i, err = 0;
1061
1062        if (info->var.bits_per_pixel == 8) {
1063                if (cmap->start + cmap->len > info->cmap.start +
1064                    info->cmap.len || cmap->start < info->cmap.start)
1065                        return -EINVAL;
1066
1067                entries = kmalloc(sizeof(*entries) * cmap->len, GFP_KERNEL);
1068                if (!entries)
1069                        return -ENOMEM;
1070
1071                for (i = 0; i < cmap->len; i++) {
1072                        entries[i].red   = cmap->red[i]   >> shift;
1073                        entries[i].green = cmap->green[i] >> shift;
1074                        entries[i].blue  = cmap->blue[i]  >> shift;
1075                        entries[i].pad   = 0;
1076                }
1077                err = uvesafb_setpalette(entries, cmap->len, cmap->start, info);
1078                kfree(entries);
1079        } else {
1080                /*
1081                 * For modes with bpp > 8, we only set the pseudo palette in
1082                 * the fb_info struct. We rely on uvesafb_setcolreg to do all
1083                 * sanity checking.
1084                 */
1085                for (i = 0; i < cmap->len; i++) {
1086                        err |= uvesafb_setcolreg(cmap->start + i, cmap->red[i],
1087                                                cmap->green[i], cmap->blue[i],
1088                                                0, info);
1089                }
1090        }
1091        return err;
1092}
1093
1094static int uvesafb_pan_display(struct fb_var_screeninfo *var,
1095                struct fb_info *info)
1096{
1097#ifdef CONFIG_X86_32
1098        int offset;
1099        struct uvesafb_par *par = info->par;
1100
1101        offset = (var->yoffset * info->fix.line_length + var->xoffset) / 4;
1102
1103        /*
1104         * It turns out it's not the best idea to do panning via vm86,
1105         * so we only allow it if we have a PMI.
1106         */
1107        if (par->pmi_start) {
1108                __asm__ __volatile__(
1109                        "call *(%%edi)"
1110                        : /* no return value */
1111                        : "a" (0x4f07),         /* EAX */
1112                          "b" (0),              /* EBX */
1113                          "c" (offset),         /* ECX */
1114                          "d" (offset >> 16),   /* EDX */
1115                          "D" (&par->pmi_start));    /* EDI */
1116        }
1117#endif
1118        return 0;
1119}
1120
1121static int uvesafb_blank(int blank, struct fb_info *info)
1122{
1123        struct uvesafb_ktask *task;
1124        int err = 1;
1125#ifdef CONFIG_X86
1126        struct uvesafb_par *par = info->par;
1127
1128        if (par->vbe_ib.capabilities & VBE_CAP_VGACOMPAT) {
1129                int loop = 10000;
1130                u8 seq = 0, crtc17 = 0;
1131
1132                if (blank == FB_BLANK_POWERDOWN) {
1133                        seq = 0x20;
1134                        crtc17 = 0x00;
1135                        err = 0;
1136                } else {
1137                        seq = 0x00;
1138                        crtc17 = 0x80;
1139                        err = (blank == FB_BLANK_UNBLANK) ? 0 : -EINVAL;
1140                }
1141
1142                vga_wseq(NULL, 0x00, 0x01);
1143                seq |= vga_rseq(NULL, 0x01) & ~0x20;
1144                vga_wseq(NULL, 0x00, seq);
1145
1146                crtc17 |= vga_rcrt(NULL, 0x17) & ~0x80;
1147                while (loop--);
1148                vga_wcrt(NULL, 0x17, crtc17);
1149                vga_wseq(NULL, 0x00, 0x03);
1150        } else
1151#endif /* CONFIG_X86 */
1152        {
1153                task = uvesafb_prep();
1154                if (!task)
1155                        return -ENOMEM;
1156
1157                task->t.regs.eax = 0x4f10;
1158                switch (blank) {
1159                case FB_BLANK_UNBLANK:
1160                        task->t.regs.ebx = 0x0001;
1161                        break;
1162                case FB_BLANK_NORMAL:
1163                        task->t.regs.ebx = 0x0101;      /* standby */
1164                        break;
1165                case FB_BLANK_POWERDOWN:
1166                        task->t.regs.ebx = 0x0401;      /* powerdown */
1167                        break;
1168                default:
1169                        goto out;
1170                }
1171
1172                err = uvesafb_exec(task);
1173                if (err || (task->t.regs.eax & 0xffff) != 0x004f)
1174                        err = 1;
1175out:            uvesafb_free(task);
1176        }
1177        return err;
1178}
1179
1180static int uvesafb_open(struct fb_info *info, int user)
1181{
1182        struct uvesafb_par *par = info->par;
1183        int cnt = atomic_read(&par->ref_count);
1184        u8 *buf = NULL;
1185
1186        if (!cnt && par->vbe_state_size) {
1187                buf =  uvesafb_vbe_state_save(par);
1188                if (IS_ERR(buf)) {
1189                        printk(KERN_WARNING "uvesafb: save hardware state"
1190                                "failed, error code is %ld!\n", PTR_ERR(buf));
1191                } else {
1192                        par->vbe_state_orig = buf;
1193                }
1194        }
1195
1196        atomic_inc(&par->ref_count);
1197        return 0;
1198}
1199
1200static int uvesafb_release(struct fb_info *info, int user)
1201{
1202        struct uvesafb_ktask *task = NULL;
1203        struct uvesafb_par *par = info->par;
1204        int cnt = atomic_read(&par->ref_count);
1205
1206        if (!cnt)
1207                return -EINVAL;
1208
1209        if (cnt != 1)
1210                goto out;
1211
1212        task = uvesafb_prep();
1213        if (!task)
1214                goto out;
1215
1216        /* First, try to set the standard 80x25 text mode. */
1217        task->t.regs.eax = 0x0003;
1218        uvesafb_exec(task);
1219
1220        /*
1221         * Now try to restore whatever hardware state we might have
1222         * saved when the fb device was first opened.
1223         */
1224        uvesafb_vbe_state_restore(par, par->vbe_state_orig);
1225out:
1226        atomic_dec(&par->ref_count);
1227        if (task)
1228                uvesafb_free(task);
1229        return 0;
1230}
1231
1232static int uvesafb_set_par(struct fb_info *info)
1233{
1234        struct uvesafb_par *par = info->par;
1235        struct uvesafb_ktask *task = NULL;
1236        struct vbe_crtc_ib *crtc = NULL;
1237        struct vbe_mode_ib *mode = NULL;
1238        int i, err = 0, depth = info->var.bits_per_pixel;
1239
1240        if (depth > 8 && depth != 32)
1241                depth = info->var.red.length + info->var.green.length +
1242                        info->var.blue.length;
1243
1244        i = uvesafb_vbe_find_mode(par, info->var.xres, info->var.yres, depth,
1245                                 UVESAFB_EXACT_RES | UVESAFB_EXACT_DEPTH);
1246        if (i >= 0)
1247                mode = &par->vbe_modes[i];
1248        else
1249                return -EINVAL;
1250
1251        task = uvesafb_prep();
1252        if (!task)
1253                return -ENOMEM;
1254setmode:
1255        task->t.regs.eax = 0x4f02;
1256        task->t.regs.ebx = mode->mode_id | 0x4000;      /* use LFB */
1257
1258        if (par->vbe_ib.vbe_version >= 0x0300 && !par->nocrtc &&
1259            info->var.pixclock != 0) {
1260                task->t.regs.ebx |= 0x0800;             /* use CRTC data */
1261                task->t.flags = TF_BUF_ESDI;
1262                crtc = kzalloc(sizeof(struct vbe_crtc_ib), GFP_KERNEL);
1263                if (!crtc) {
1264                        err = -ENOMEM;
1265                        goto out;
1266                }
1267                crtc->horiz_start = info->var.xres + info->var.right_margin;
1268                crtc->horiz_end   = crtc->horiz_start + info->var.hsync_len;
1269                crtc->horiz_total = crtc->horiz_end + info->var.left_margin;
1270
1271                crtc->vert_start  = info->var.yres + info->var.lower_margin;
1272                crtc->vert_end    = crtc->vert_start + info->var.vsync_len;
1273                crtc->vert_total  = crtc->vert_end + info->var.upper_margin;
1274
1275                crtc->pixel_clock = PICOS2KHZ(info->var.pixclock) * 1000;
1276                crtc->refresh_rate = (u16)(100 * (crtc->pixel_clock /
1277                                (crtc->vert_total * crtc->horiz_total)));
1278
1279                if (info->var.vmode & FB_VMODE_DOUBLE)
1280                        crtc->flags |= 0x1;
1281                if (info->var.vmode & FB_VMODE_INTERLACED)
1282                        crtc->flags |= 0x2;
1283                if (!(info->var.sync & FB_SYNC_HOR_HIGH_ACT))
1284                        crtc->flags |= 0x4;
1285                if (!(info->var.sync & FB_SYNC_VERT_HIGH_ACT))
1286                        crtc->flags |= 0x8;
1287                memcpy(&par->crtc, crtc, sizeof(*crtc));
1288        } else {
1289                memset(&par->crtc, 0, sizeof(*crtc));
1290        }
1291
1292        task->t.buf_len = sizeof(struct vbe_crtc_ib);
1293        task->buf = &par->crtc;
1294
1295        err = uvesafb_exec(task);
1296        if (err || (task->t.regs.eax & 0xffff) != 0x004f) {
1297                /*
1298                 * The mode switch might have failed because we tried to
1299                 * use our own timings.  Try again with the default timings.
1300                 */
1301                if (crtc != NULL) {
1302                        printk(KERN_WARNING "uvesafb: mode switch failed "
1303                                "(eax=0x%x, err=%d). Trying again with "
1304                                "default timings.\n", task->t.regs.eax, err);
1305                        uvesafb_reset(task);
1306                        kfree(crtc);
1307                        crtc = NULL;
1308                        info->var.pixclock = 0;
1309                        goto setmode;
1310                } else {
1311                        printk(KERN_ERR "uvesafb: mode switch failed (eax="
1312                                "0x%x, err=%d)\n", task->t.regs.eax, err);
1313                        err = -EINVAL;
1314                        goto out;
1315                }
1316        }
1317        par->mode_idx = i;
1318
1319        /* For 8bpp modes, always try to set the DAC to 8 bits. */
1320        if (par->vbe_ib.capabilities & VBE_CAP_CAN_SWITCH_DAC &&
1321            mode->bits_per_pixel <= 8) {
1322                uvesafb_reset(task);
1323                task->t.regs.eax = 0x4f08;
1324                task->t.regs.ebx = 0x0800;
1325
1326                err = uvesafb_exec(task);
1327                if (err || (task->t.regs.eax & 0xffff) != 0x004f ||
1328                    ((task->t.regs.ebx & 0xff00) >> 8) != 8) {
1329                        dac_width = 6;
1330                } else {
1331                        dac_width = 8;
1332                }
1333        }
1334
1335        info->fix.visual = (info->var.bits_per_pixel == 8) ?
1336                                FB_VISUAL_PSEUDOCOLOR : FB_VISUAL_TRUECOLOR;
1337        info->fix.line_length = mode->bytes_per_scan_line;
1338
1339out:    if (crtc != NULL)
1340                kfree(crtc);
1341        uvesafb_free(task);
1342
1343        return err;
1344}
1345
1346static void uvesafb_check_limits(struct fb_var_screeninfo *var,
1347                struct fb_info *info)
1348{
1349        const struct fb_videomode *mode;
1350        struct uvesafb_par *par = info->par;
1351
1352        /*
1353         * If pixclock is set to 0, then we're using default BIOS timings
1354         * and thus don't have to perform any checks here.
1355         */
1356        if (!var->pixclock)
1357                return;
1358
1359        if (par->vbe_ib.vbe_version < 0x0300) {
1360                fb_get_mode(FB_VSYNCTIMINGS | FB_IGNOREMON, 60, var, info);
1361                return;
1362        }
1363
1364        if (!fb_validate_mode(var, info))
1365                return;
1366
1367        mode = fb_find_best_mode(var, &info->modelist);
1368        if (mode) {
1369                if (mode->xres == var->xres && mode->yres == var->yres &&
1370                    !(mode->vmode & (FB_VMODE_INTERLACED | FB_VMODE_DOUBLE))) {
1371                        fb_videomode_to_var(var, mode);
1372                        return;
1373                }
1374        }
1375
1376        if (info->monspecs.gtf && !fb_get_mode(FB_MAXTIMINGS, 0, var, info))
1377                return;
1378        /* Use default refresh rate */
1379        var->pixclock = 0;
1380}
1381
1382static int uvesafb_check_var(struct fb_var_screeninfo *var,
1383                struct fb_info *info)
1384{
1385        struct uvesafb_par *par = info->par;
1386        struct vbe_mode_ib *mode = NULL;
1387        int match = -1;
1388        int depth = var->red.length + var->green.length + var->blue.length;
1389
1390        /*
1391         * Various apps will use bits_per_pixel to set the color depth,
1392         * which is theoretically incorrect, but which we'll try to handle
1393         * here.
1394         */
1395        if (depth == 0 || abs(depth - var->bits_per_pixel) >= 8)
1396                depth = var->bits_per_pixel;
1397
1398        match = uvesafb_vbe_find_mode(par, var->xres, var->yres, depth,
1399                                                UVESAFB_EXACT_RES);
1400        if (match == -1)
1401                return -EINVAL;
1402
1403        mode = &par->vbe_modes[match];
1404        uvesafb_setup_var(var, info, mode);
1405
1406        /*
1407         * Check whether we have remapped enough memory for this mode.
1408         * We might be called at an early stage, when we haven't remapped
1409         * any memory yet, in which case we simply skip the check.
1410         */
1411        if (var->yres * mode->bytes_per_scan_line > info->fix.smem_len
1412                                                && info->fix.smem_len)
1413                return -EINVAL;
1414
1415        if ((var->vmode & FB_VMODE_DOUBLE) &&
1416                                !(par->vbe_modes[match].mode_attr & 0x100))
1417                var->vmode &= ~FB_VMODE_DOUBLE;
1418
1419        if ((var->vmode & FB_VMODE_INTERLACED) &&
1420                                !(par->vbe_modes[match].mode_attr & 0x200))
1421                var->vmode &= ~FB_VMODE_INTERLACED;
1422
1423        uvesafb_check_limits(var, info);
1424
1425        var->xres_virtual = var->xres;
1426        var->yres_virtual = (par->ypan) ?
1427                                info->fix.smem_len / mode->bytes_per_scan_line :
1428                                var->yres;
1429        return 0;
1430}
1431
1432static struct fb_ops uvesafb_ops = {
1433        .owner          = THIS_MODULE,
1434        .fb_open        = uvesafb_open,
1435        .fb_release     = uvesafb_release,
1436        .fb_setcolreg   = uvesafb_setcolreg,
1437        .fb_setcmap     = uvesafb_setcmap,
1438        .fb_pan_display = uvesafb_pan_display,
1439        .fb_blank       = uvesafb_blank,
1440        .fb_fillrect    = cfb_fillrect,
1441        .fb_copyarea    = cfb_copyarea,
1442        .fb_imageblit   = cfb_imageblit,
1443        .fb_check_var   = uvesafb_check_var,
1444        .fb_set_par     = uvesafb_set_par,
1445};
1446
1447static void __devinit uvesafb_init_info(struct fb_info *info,
1448                struct vbe_mode_ib *mode)
1449{
1450        unsigned int size_vmode;
1451        unsigned int size_remap;
1452        unsigned int size_total;
1453        struct uvesafb_par *par = info->par;
1454        int i, h;
1455
1456        info->pseudo_palette = ((u8 *)info->par + sizeof(struct uvesafb_par));
1457        info->fix = uvesafb_fix;
1458        info->fix.ypanstep = par->ypan ? 1 : 0;
1459        info->fix.ywrapstep = (par->ypan > 1) ? 1 : 0;
1460
1461        /* Disable blanking if the user requested so. */
1462        if (!blank)
1463                info->fbops->fb_blank = NULL;
1464
1465        /*
1466         * Find out how much IO memory is required for the mode with
1467         * the highest resolution.
1468         */
1469        size_remap = 0;
1470        for (i = 0; i < par->vbe_modes_cnt; i++) {
1471                h = par->vbe_modes[i].bytes_per_scan_line *
1472                                        par->vbe_modes[i].y_res;
1473                if (h > size_remap)
1474                        size_remap = h;
1475        }
1476        size_remap *= 2;
1477
1478        /*
1479         *   size_vmode -- that is the amount of memory needed for the
1480         *                 used video mode, i.e. the minimum amount of
1481         *                 memory we need.
1482         */
1483        if (mode != NULL) {
1484                size_vmode = info->var.yres * mode->bytes_per_scan_line;
1485        } else {
1486                size_vmode = info->var.yres * info->var.xres *
1487                             ((info->var.bits_per_pixel + 7) >> 3);
1488        }
1489
1490        /*
1491         *   size_total -- all video memory we have. Used for mtrr
1492         *                 entries, resource allocation and bounds
1493         *                 checking.
1494         */
1495        size_total = par->vbe_ib.total_memory * 65536;
1496        if (vram_total)
1497                size_total = vram_total * 1024 * 1024;
1498        if (size_total < size_vmode)
1499                size_total = size_vmode;
1500
1501        /*
1502         *   size_remap -- the amount of video memory we are going to
1503         *                 use for vesafb.  With modern cards it is no
1504         *                 option to simply use size_total as th
1505         *                 wastes plenty of kernel address space.
1506         */
1507        if (vram_remap)
1508                size_remap = vram_remap * 1024 * 1024;
1509        if (size_remap < size_vmode)
1510                size_remap = size_vmode;
1511        if (size_remap > size_total)
1512                size_remap = size_total;
1513
1514        info->fix.smem_len = size_remap;
1515        info->fix.smem_start = mode->phys_base_ptr;
1516
1517        /*
1518         * We have to set yres_virtual here because when setup_var() was
1519         * called, smem_len wasn't defined yet.
1520         */
1521        info->var.yres_virtual = info->fix.smem_len /
1522                                 mode->bytes_per_scan_line;
1523
1524        if (par->ypan && info->var.yres_virtual > info->var.yres) {
1525                printk(KERN_INFO "uvesafb: scrolling: %s "
1526                        "using protected mode interface, "
1527                        "yres_virtual=%d\n",
1528                        (par->ypan > 1) ? "ywrap" : "ypan",
1529                        info->var.yres_virtual);
1530        } else {
1531                printk(KERN_INFO "uvesafb: scrolling: redraw\n");
1532                info->var.yres_virtual = info->var.yres;
1533                par->ypan = 0;
1534        }
1535
1536        info->flags = FBINFO_FLAG_DEFAULT |
1537                        (par->ypan ? FBINFO_HWACCEL_YPAN : 0);
1538
1539        if (!par->ypan)
1540                info->fbops->fb_pan_display = NULL;
1541}
1542
1543static void __devinit uvesafb_init_mtrr(struct fb_info *info)
1544{
1545#ifdef CONFIG_MTRR
1546        if (mtrr && !(info->fix.smem_start & (PAGE_SIZE - 1))) {
1547                int temp_size = info->fix.smem_len;
1548                unsigned int type = 0;
1549
1550                switch (mtrr) {
1551                case 1:
1552                        type = MTRR_TYPE_UNCACHABLE;
1553                        break;
1554                case 2:
1555                        type = MTRR_TYPE_WRBACK;
1556                        break;
1557                case 3:
1558                        type = MTRR_TYPE_WRCOMB;
1559                        break;
1560                case 4:
1561                        type = MTRR_TYPE_WRTHROUGH;
1562                        break;
1563                default:
1564                        type = 0;
1565                        break;
1566                }
1567
1568                if (type) {
1569                        int rc;
1570
1571                        /* Find the largest power-of-two */
1572                        temp_size = roundup_pow_of_two(temp_size);
1573
1574                        /* Try and find a power of two to add */
1575                        do {
1576                                rc = mtrr_add(info->fix.smem_start,
1577                                              temp_size, type, 1);
1578                                temp_size >>= 1;
1579                        } while (temp_size >= PAGE_SIZE && rc == -EINVAL);
1580                }
1581        }
1582#endif /* CONFIG_MTRR */
1583}
1584
1585static void __devinit uvesafb_ioremap(struct fb_info *info)
1586{
1587#ifdef CONFIG_X86
1588        switch (mtrr) {
1589        case 1: /* uncachable */
1590                info->screen_base = ioremap_nocache(info->fix.smem_start, info->fix.smem_len);
1591                break;
1592        case 2: /* write-back */
1593                info->screen_base = ioremap_cache(info->fix.smem_start, info->fix.smem_len);
1594                break;
1595        case 3: /* write-combining */
1596                info->screen_base = ioremap_wc(info->fix.smem_start, info->fix.smem_len);
1597                break;
1598        case 4: /* write-through */
1599        default:
1600                info->screen_base = ioremap(info->fix.smem_start, info->fix.smem_len);
1601                break;
1602        }
1603#else
1604        info->screen_base = ioremap(info->fix.smem_start, info->fix.smem_len);
1605#endif /* CONFIG_X86 */
1606}
1607
1608static ssize_t uvesafb_show_vbe_ver(struct device *dev,
1609                struct device_attribute *attr, char *buf)
1610{
1611        struct fb_info *info = platform_get_drvdata(to_platform_device(dev));
1612        struct uvesafb_par *par = info->par;
1613
1614        return snprintf(buf, PAGE_SIZE, "%.4x\n", par->vbe_ib.vbe_version);
1615}
1616
1617static DEVICE_ATTR(vbe_version, S_IRUGO, uvesafb_show_vbe_ver, NULL);
1618
1619static ssize_t uvesafb_show_vbe_modes(struct device *dev,
1620                struct device_attribute *attr, char *buf)
1621{
1622        struct fb_info *info = platform_get_drvdata(to_platform_device(dev));
1623        struct uvesafb_par *par = info->par;
1624        int ret = 0, i;
1625
1626        for (i = 0; i < par->vbe_modes_cnt && ret < PAGE_SIZE; i++) {
1627                ret += snprintf(buf + ret, PAGE_SIZE - ret,
1628                        "%dx%d-%d, 0x%.4x\n",
1629                        par->vbe_modes[i].x_res, par->vbe_modes[i].y_res,
1630                        par->vbe_modes[i].depth, par->vbe_modes[i].mode_id);
1631        }
1632
1633        return ret;
1634}
1635
1636static DEVICE_ATTR(vbe_modes, S_IRUGO, uvesafb_show_vbe_modes, NULL);
1637
1638static ssize_t uvesafb_show_vendor(struct device *dev,
1639                struct device_attribute *attr, char *buf)
1640{
1641        struct fb_info *info = platform_get_drvdata(to_platform_device(dev));
1642        struct uvesafb_par *par = info->par;
1643
1644        if (par->vbe_ib.oem_vendor_name_ptr)
1645                return snprintf(buf, PAGE_SIZE, "%s\n", (char *)
1646                        (&par->vbe_ib) + par->vbe_ib.oem_vendor_name_ptr);
1647        else
1648                return 0;
1649}
1650
1651static DEVICE_ATTR(oem_vendor, S_IRUGO, uvesafb_show_vendor, NULL);
1652
1653static ssize_t uvesafb_show_product_name(struct device *dev,
1654                struct device_attribute *attr, char *buf)
1655{
1656        struct fb_info *info = platform_get_drvdata(to_platform_device(dev));
1657        struct uvesafb_par *par = info->par;
1658
1659        if (par->vbe_ib.oem_product_name_ptr)
1660                return snprintf(buf, PAGE_SIZE, "%s\n", (char *)
1661                        (&par->vbe_ib) + par->vbe_ib.oem_product_name_ptr);
1662        else
1663                return 0;
1664}
1665
1666static DEVICE_ATTR(oem_product_name, S_IRUGO, uvesafb_show_product_name, NULL);
1667
1668static ssize_t uvesafb_show_product_rev(struct device *dev,
1669                struct device_attribute *attr, char *buf)
1670{
1671        struct fb_info *info = platform_get_drvdata(to_platform_device(dev));
1672        struct uvesafb_par *par = info->par;
1673
1674        if (par->vbe_ib.oem_product_rev_ptr)
1675                return snprintf(buf, PAGE_SIZE, "%s\n", (char *)
1676                        (&par->vbe_ib) + par->vbe_ib.oem_product_rev_ptr);
1677        else
1678                return 0;
1679}
1680
1681static DEVICE_ATTR(oem_product_rev, S_IRUGO, uvesafb_show_product_rev, NULL);
1682
1683static ssize_t uvesafb_show_oem_string(struct device *dev,
1684                struct device_attribute *attr, char *buf)
1685{
1686        struct fb_info *info = platform_get_drvdata(to_platform_device(dev));
1687        struct uvesafb_par *par = info->par;
1688
1689        if (par->vbe_ib.oem_string_ptr)
1690                return snprintf(buf, PAGE_SIZE, "%s\n",
1691                        (char *)(&par->vbe_ib) + par->vbe_ib.oem_string_ptr);
1692        else
1693                return 0;
1694}
1695
1696static DEVICE_ATTR(oem_string, S_IRUGO, uvesafb_show_oem_string, NULL);
1697
1698static ssize_t uvesafb_show_nocrtc(struct device *dev,
1699                struct device_attribute *attr, char *buf)
1700{
1701        struct fb_info *info = platform_get_drvdata(to_platform_device(dev));
1702        struct uvesafb_par *par = info->par;
1703
1704        return snprintf(buf, PAGE_SIZE, "%d\n", par->nocrtc);
1705}
1706
1707static ssize_t uvesafb_store_nocrtc(struct device *dev,
1708                struct device_attribute *attr, const char *buf, size_t count)
1709{
1710        struct fb_info *info = platform_get_drvdata(to_platform_device(dev));
1711        struct uvesafb_par *par = info->par;
1712
1713        if (count > 0) {
1714                if (buf[0] == '0')
1715                        par->nocrtc = 0;
1716                else
1717                        par->nocrtc = 1;
1718        }
1719        return count;
1720}
1721
1722static DEVICE_ATTR(nocrtc, S_IRUGO | S_IWUSR, uvesafb_show_nocrtc,
1723                        uvesafb_store_nocrtc);
1724
1725static struct attribute *uvesafb_dev_attrs[] = {
1726        &dev_attr_vbe_version.attr,
1727        &dev_attr_vbe_modes.attr,
1728        &dev_attr_oem_vendor.attr,
1729        &dev_attr_oem_product_name.attr,
1730        &dev_attr_oem_product_rev.attr,
1731        &dev_attr_oem_string.attr,
1732        &dev_attr_nocrtc.attr,
1733        NULL,
1734};
1735
1736static struct attribute_group uvesafb_dev_attgrp = {
1737        .name = NULL,
1738        .attrs = uvesafb_dev_attrs,
1739};
1740
1741static int __devinit uvesafb_probe(struct platform_device *dev)
1742{
1743        struct fb_info *info;
1744        struct vbe_mode_ib *mode = NULL;
1745        struct uvesafb_par *par;
1746        int err = 0, i;
1747
1748        info = framebuffer_alloc(sizeof(*par) + sizeof(u32) * 256, &dev->dev);
1749        if (!info)
1750                return -ENOMEM;
1751
1752        par = info->par;
1753
1754        err = uvesafb_vbe_init(info);
1755        if (err) {
1756                printk(KERN_ERR "uvesafb: vbe_init() failed with %d\n", err);
1757                goto out;
1758        }
1759
1760        info->fbops = &uvesafb_ops;
1761
1762        i = uvesafb_vbe_init_mode(info);
1763        if (i < 0) {
1764                err = -EINVAL;
1765                goto out;
1766        } else {
1767                mode = &par->vbe_modes[i];
1768        }
1769
1770        if (fb_alloc_cmap(&info->cmap, 256, 0) < 0) {
1771                err = -ENXIO;
1772                goto out;
1773        }
1774
1775        uvesafb_init_info(info, mode);
1776
1777        if (!request_region(0x3c0, 32, "uvesafb")) {
1778                printk(KERN_ERR "uvesafb: request region 0x3c0-0x3e0 failed\n");
1779                err = -EIO;
1780                goto out_mode;
1781        }
1782
1783        if (!request_mem_region(info->fix.smem_start, info->fix.smem_len,
1784                                "uvesafb")) {
1785                printk(KERN_ERR "uvesafb: cannot reserve video memory at "
1786                                "0x%lx\n", info->fix.smem_start);
1787                err = -EIO;
1788                goto out_reg;
1789        }
1790
1791        uvesafb_init_mtrr(info);
1792        uvesafb_ioremap(info);
1793
1794        if (!info->screen_base) {
1795                printk(KERN_ERR
1796                        "uvesafb: abort, cannot ioremap 0x%x bytes of video "
1797                        "memory at 0x%lx\n",
1798                        info->fix.smem_len, info->fix.smem_start);
1799                err = -EIO;
1800                goto out_mem;
1801        }
1802
1803        platform_set_drvdata(dev, info);
1804
1805        if (register_framebuffer(info) < 0) {
1806                printk(KERN_ERR
1807                        "uvesafb: failed to register framebuffer device\n");
1808                err = -EINVAL;
1809                goto out_unmap;
1810        }
1811
1812        printk(KERN_INFO "uvesafb: framebuffer at 0x%lx, mapped to 0x%p, "
1813                        "using %dk, total %dk\n", info->fix.smem_start,
1814                        info->screen_base, info->fix.smem_len/1024,
1815                        par->vbe_ib.total_memory * 64);
1816        printk(KERN_INFO "fb%d: %s frame buffer device\n", info->node,
1817                        info->fix.id);
1818
1819        err = sysfs_create_group(&dev->dev.kobj, &uvesafb_dev_attgrp);
1820        if (err != 0)
1821                printk(KERN_WARNING "fb%d: failed to register attributes\n",
1822                        info->node);
1823
1824        return 0;
1825
1826out_unmap:
1827        iounmap(info->screen_base);
1828out_mem:
1829        release_mem_region(info->fix.smem_start, info->fix.smem_len);
1830out_reg:
1831        release_region(0x3c0, 32);
1832out_mode:
1833        if (!list_empty(&info->modelist))
1834                fb_destroy_modelist(&info->modelist);
1835        fb_destroy_modedb(info->monspecs.modedb);
1836        fb_dealloc_cmap(&info->cmap);
1837out:
1838        if (par->vbe_modes)
1839                kfree(par->vbe_modes);
1840
1841        framebuffer_release(info);
1842        return err;
1843}
1844
1845static int uvesafb_remove(struct platform_device *dev)
1846{
1847        struct fb_info *info = platform_get_drvdata(dev);
1848
1849        if (info) {
1850                struct uvesafb_par *par = info->par;
1851
1852                sysfs_remove_group(&dev->dev.kobj, &uvesafb_dev_attgrp);
1853                unregister_framebuffer(info);
1854                release_region(0x3c0, 32);
1855                iounmap(info->screen_base);
1856                release_mem_region(info->fix.smem_start, info->fix.smem_len);
1857                fb_destroy_modedb(info->monspecs.modedb);
1858                fb_dealloc_cmap(&info->cmap);
1859
1860                if (par) {
1861                        if (par->vbe_modes)
1862                                kfree(par->vbe_modes);
1863                        if (par->vbe_state_orig)
1864                                kfree(par->vbe_state_orig);
1865                        if (par->vbe_state_saved)
1866                                kfree(par->vbe_state_saved);
1867                }
1868
1869                framebuffer_release(info);
1870        }
1871        return 0;
1872}
1873
1874static struct platform_driver uvesafb_driver = {
1875        .probe  = uvesafb_probe,
1876        .remove = uvesafb_remove,
1877        .driver = {
1878                .name = "uvesafb",
1879        },
1880};
1881
1882static struct platform_device *uvesafb_device;
1883
1884#ifndef MODULE
1885static int __devinit uvesafb_setup(char *options)
1886{
1887        char *this_opt;
1888
1889        if (!options || !*options)
1890                return 0;
1891
1892        while ((this_opt = strsep(&options, ",")) != NULL) {
1893                if (!*this_opt) continue;
1894
1895                if (!strcmp(this_opt, "redraw"))
1896                        ypan = 0;
1897                else if (!strcmp(this_opt, "ypan"))
1898                        ypan = 1;
1899                else if (!strcmp(this_opt, "ywrap"))
1900                        ypan = 2;
1901                else if (!strcmp(this_opt, "vgapal"))
1902                        pmi_setpal = 0;
1903                else if (!strcmp(this_opt, "pmipal"))
1904                        pmi_setpal = 1;
1905                else if (!strncmp(this_opt, "mtrr:", 5))
1906                        mtrr = simple_strtoul(this_opt+5, NULL, 0);
1907                else if (!strcmp(this_opt, "nomtrr"))
1908                        mtrr = 0;
1909                else if (!strcmp(this_opt, "nocrtc"))
1910                        nocrtc = 1;
1911                else if (!strcmp(this_opt, "noedid"))
1912                        noedid = 1;
1913                else if (!strcmp(this_opt, "noblank"))
1914                        blank = 0;
1915                else if (!strncmp(this_opt, "vtotal:", 7))
1916                        vram_total = simple_strtoul(this_opt + 7, NULL, 0);
1917                else if (!strncmp(this_opt, "vremap:", 7))
1918                        vram_remap = simple_strtoul(this_opt + 7, NULL, 0);
1919                else if (!strncmp(this_opt, "maxhf:", 6))
1920                        maxhf = simple_strtoul(this_opt + 6, NULL, 0);
1921                else if (!strncmp(this_opt, "maxvf:", 6))
1922                        maxvf = simple_strtoul(this_opt + 6, NULL, 0);
1923                else if (!strncmp(this_opt, "maxclk:", 7))
1924                        maxclk = simple_strtoul(this_opt + 7, NULL, 0);
1925                else if (!strncmp(this_opt, "vbemode:", 8))
1926                        vbemode = simple_strtoul(this_opt + 8, NULL, 0);
1927                else if (this_opt[0] >= '0' && this_opt[0] <= '9') {
1928                        mode_option = this_opt;
1929                } else {
1930                        printk(KERN_WARNING
1931                                "uvesafb: unrecognized option %s\n", this_opt);
1932                }
1933        }
1934
1935        return 0;
1936}
1937#endif /* !MODULE */
1938
1939static ssize_t show_v86d(struct device_driver *dev, char *buf)
1940{
1941        return snprintf(buf, PAGE_SIZE, "%s\n", v86d_path);
1942}
1943
1944static ssize_t store_v86d(struct device_driver *dev, const char *buf,
1945                size_t count)
1946{
1947        strncpy(v86d_path, buf, PATH_MAX);
1948        return count;
1949}
1950
1951static DRIVER_ATTR(v86d, S_IRUGO | S_IWUSR, show_v86d, store_v86d);
1952
1953static int __devinit uvesafb_init(void)
1954{
1955        int err;
1956
1957#ifndef MODULE
1958        char *option = NULL;
1959
1960        if (fb_get_options("uvesafb", &option))
1961                return -ENODEV;
1962        uvesafb_setup(option);
1963#endif
1964        err = cn_add_callback(&uvesafb_cn_id, "uvesafb", uvesafb_cn_callback);
1965        if (err)
1966                return err;
1967
1968        err = platform_driver_register(&uvesafb_driver);
1969
1970        if (!err) {
1971                uvesafb_device = platform_device_alloc("uvesafb", 0);
1972                if (uvesafb_device)
1973                        err = platform_device_add(uvesafb_device);
1974                else
1975                        err = -ENOMEM;
1976
1977                if (err) {
1978                        platform_device_put(uvesafb_device);
1979                        platform_driver_unregister(&uvesafb_driver);
1980                        cn_del_callback(&uvesafb_cn_id);
1981                        return err;
1982                }
1983
1984                err = driver_create_file(&uvesafb_driver.driver,
1985                                &driver_attr_v86d);
1986                if (err) {
1987                        printk(KERN_WARNING "uvesafb: failed to register "
1988                                        "attributes\n");
1989                        err = 0;
1990                }
1991        }
1992        return err;
1993}
1994
1995module_init(uvesafb_init);
1996
1997static void __devexit uvesafb_exit(void)
1998{
1999        struct uvesafb_ktask *task;
2000
2001        if (v86d_started) {
2002                task = uvesafb_prep();
2003                if (task) {
2004                        task->t.flags = TF_EXIT;
2005                        uvesafb_exec(task);
2006                        uvesafb_free(task);
2007                }
2008        }
2009
2010        cn_del_callback(&uvesafb_cn_id);
2011        driver_remove_file(&uvesafb_driver.driver, &driver_attr_v86d);
2012        platform_device_unregister(uvesafb_device);
2013        platform_driver_unregister(&uvesafb_driver);
2014}
2015
2016module_exit(uvesafb_exit);
2017
2018static int param_set_scroll(const char *val, const struct kernel_param *kp)
2019{
2020        ypan = 0;
2021
2022        if (!strcmp(val, "redraw"))
2023                ypan = 0;
2024        else if (!strcmp(val, "ypan"))
2025                ypan = 1;
2026        else if (!strcmp(val, "ywrap"))
2027                ypan = 2;
2028        else
2029                return -EINVAL;
2030
2031        return 0;
2032}
2033static struct kernel_param_ops param_ops_scroll = {
2034        .set = param_set_scroll,
2035};
2036#define param_check_scroll(name, p) __param_check(name, p, void)
2037
2038module_param_named(scroll, ypan, scroll, 0);
2039MODULE_PARM_DESC(scroll,
2040        "Scrolling mode, set to 'redraw', 'ypan', or 'ywrap'");
2041module_param_named(vgapal, pmi_setpal, invbool, 0);
2042MODULE_PARM_DESC(vgapal, "Set palette using VGA registers");
2043module_param_named(pmipal, pmi_setpal, bool, 0);
2044MODULE_PARM_DESC(pmipal, "Set palette using PMI calls");
2045module_param(mtrr, uint, 0);
2046MODULE_PARM_DESC(mtrr,
2047        "Memory Type Range Registers setting. Use 0 to disable.");
2048module_param(blank, bool, 0);
2049MODULE_PARM_DESC(blank, "Enable hardware blanking");
2050module_param(nocrtc, bool, 0);
2051MODULE_PARM_DESC(nocrtc, "Ignore CRTC timings when setting modes");
2052module_param(noedid, bool, 0);
2053MODULE_PARM_DESC(noedid,
2054        "Ignore EDID-provided monitor limits when setting modes");
2055module_param(vram_remap, uint, 0);
2056MODULE_PARM_DESC(vram_remap, "Set amount of video memory to be used [MiB]");
2057module_param(vram_total, uint, 0);
2058MODULE_PARM_DESC(vram_total, "Set total amount of video memoery [MiB]");
2059module_param(maxclk, ushort, 0);
2060MODULE_PARM_DESC(maxclk, "Maximum pixelclock [MHz], overrides EDID data");
2061module_param(maxhf, ushort, 0);
2062MODULE_PARM_DESC(maxhf,
2063        "Maximum horizontal frequency [kHz], overrides EDID data");
2064module_param(maxvf, ushort, 0);
2065MODULE_PARM_DESC(maxvf,
2066        "Maximum vertical frequency [Hz], overrides EDID data");
2067module_param(mode_option, charp, 0);
2068MODULE_PARM_DESC(mode_option,
2069        "Specify initial video mode as \"<xres>x<yres>[-<bpp>][@<refresh>]\"");
2070module_param(vbemode, ushort, 0);
2071MODULE_PARM_DESC(vbemode,
2072        "VBE mode number to set, overrides the 'mode' option");
2073module_param_string(v86d, v86d_path, PATH_MAX, 0660);
2074MODULE_PARM_DESC(v86d, "Path to the v86d userspace helper.");
2075
2076MODULE_LICENSE("GPL");
2077MODULE_AUTHOR("Michal Januszewski <spock@gentoo.org>");
2078MODULE_DESCRIPTION("Framebuffer driver for VBE2.0+ compliant graphics boards");
2079
2080
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