linux/drivers/video/fbdev/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#include "edid.h"
  28
  29static struct cb_id uvesafb_cn_id = {
  30        .idx = CN_IDX_V86D,
  31        .val = CN_VAL_V86D_UVESAFB
  32};
  33static char v86d_path[PATH_MAX] = "/sbin/v86d";
  34static char v86d_started;       /* has v86d been started by uvesafb? */
  35
  36static const struct fb_fix_screeninfo uvesafb_fix = {
  37        .id     = "VESA VGA",
  38        .type   = FB_TYPE_PACKED_PIXELS,
  39        .accel  = FB_ACCEL_NONE,
  40        .visual = FB_VISUAL_TRUECOLOR,
  41};
  42
  43static int mtrr         = 3;    /* enable mtrr by default */
  44static bool blank       = 1;    /* enable blanking by default */
  45static int ypan         = 1;    /* 0: scroll, 1: ypan, 2: ywrap */
  46static bool pmi_setpal  = true; /* use PMI for palette changes */
  47static bool nocrtc;             /* ignore CRTC settings */
  48static bool noedid;             /* don't try DDC transfers */
  49static int vram_remap;          /* set amt. of memory to be used */
  50static int vram_total;          /* set total amount of memory */
  51static u16 maxclk;              /* maximum pixel clock */
  52static u16 maxvf;               /* maximum vertical frequency */
  53static u16 maxhf;               /* maximum horizontal frequency */
  54static u16 vbemode;             /* force use of a specific VBE mode */
  55static char *mode_option;
  56static u8  dac_width    = 6;
  57
  58static struct uvesafb_ktask *uvfb_tasks[UVESAFB_TASKS_MAX];
  59static DEFINE_MUTEX(uvfb_lock);
  60
  61/*
  62 * A handler for replies from userspace.
  63 *
  64 * Make sure each message passes consistency checks and if it does,
  65 * find the kernel part of the task struct, copy the registers and
  66 * the buffer contents and then complete the task.
  67 */
  68static void uvesafb_cn_callback(struct cn_msg *msg, struct netlink_skb_parms *nsp)
  69{
  70        struct uvesafb_task *utask;
  71        struct uvesafb_ktask *task;
  72
  73        if (!capable(CAP_SYS_ADMIN))
  74                return;
  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
 108static 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, UMH_WAIT_PROC);
 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 */
 140static 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 = prandom_u32();
 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, 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, 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;
 225out:
 226        kfree(m);
 227        return err;
 228}
 229
 230/*
 231 * Free a uvesafb_ktask struct.
 232 */
 233static void uvesafb_free(struct uvesafb_ktask *task)
 234{
 235        if (task) {
 236                kfree(task->done);
 237                kfree(task);
 238        }
 239}
 240
 241/*
 242 * Prepare a uvesafb_ktask struct to be used again.
 243 */
 244static void uvesafb_reset(struct uvesafb_ktask *task)
 245{
 246        struct completion *cpl = task->done;
 247
 248        memset(task, 0, sizeof(*task));
 249        task->done = cpl;
 250}
 251
 252/*
 253 * Allocate and prepare a uvesafb_ktask struct.
 254 */
 255static struct uvesafb_ktask *uvesafb_prep(void)
 256{
 257        struct uvesafb_ktask *task;
 258
 259        task = kzalloc(sizeof(*task), GFP_KERNEL);
 260        if (task) {
 261                task->done = kzalloc(sizeof(*task->done), GFP_KERNEL);
 262                if (!task->done) {
 263                        kfree(task);
 264                        task = NULL;
 265                }
 266        }
 267        return task;
 268}
 269
 270static void uvesafb_setup_var(struct fb_var_screeninfo *var,
 271                struct fb_info *info, struct vbe_mode_ib *mode)
 272{
 273        struct uvesafb_par *par = info->par;
 274
 275        var->vmode = FB_VMODE_NONINTERLACED;
 276        var->sync = FB_SYNC_VERT_HIGH_ACT;
 277
 278        var->xres = mode->x_res;
 279        var->yres = mode->y_res;
 280        var->xres_virtual = mode->x_res;
 281        var->yres_virtual = (par->ypan) ?
 282                        info->fix.smem_len / mode->bytes_per_scan_line :
 283                        mode->y_res;
 284        var->xoffset = 0;
 285        var->yoffset = 0;
 286        var->bits_per_pixel = mode->bits_per_pixel;
 287
 288        if (var->bits_per_pixel == 15)
 289                var->bits_per_pixel = 16;
 290
 291        if (var->bits_per_pixel > 8) {
 292                var->red.offset    = mode->red_off;
 293                var->red.length    = mode->red_len;
 294                var->green.offset  = mode->green_off;
 295                var->green.length  = mode->green_len;
 296                var->blue.offset   = mode->blue_off;
 297                var->blue.length   = mode->blue_len;
 298                var->transp.offset = mode->rsvd_off;
 299                var->transp.length = mode->rsvd_len;
 300        } else {
 301                var->red.offset    = 0;
 302                var->green.offset  = 0;
 303                var->blue.offset   = 0;
 304                var->transp.offset = 0;
 305
 306                var->red.length    = 8;
 307                var->green.length  = 8;
 308                var->blue.length   = 8;
 309                var->transp.length = 0;
 310        }
 311}
 312
 313static int uvesafb_vbe_find_mode(struct uvesafb_par *par,
 314                int xres, int yres, int depth, unsigned char flags)
 315{
 316        int i, match = -1, h = 0, d = 0x7fffffff;
 317
 318        for (i = 0; i < par->vbe_modes_cnt; i++) {
 319                h = abs(par->vbe_modes[i].x_res - xres) +
 320                    abs(par->vbe_modes[i].y_res - yres) +
 321                    abs(depth - par->vbe_modes[i].depth);
 322
 323                /*
 324                 * We have an exact match in terms of resolution
 325                 * and depth.
 326                 */
 327                if (h == 0)
 328                        return i;
 329
 330                if (h < d || (h == d && par->vbe_modes[i].depth > depth)) {
 331                        d = h;
 332                        match = i;
 333                }
 334        }
 335        i = 1;
 336
 337        if (flags & UVESAFB_EXACT_DEPTH &&
 338                        par->vbe_modes[match].depth != depth)
 339                i = 0;
 340
 341        if (flags & UVESAFB_EXACT_RES && d > 24)
 342                i = 0;
 343
 344        if (i != 0)
 345                return match;
 346        else
 347                return -1;
 348}
 349
 350static u8 *uvesafb_vbe_state_save(struct uvesafb_par *par)
 351{
 352        struct uvesafb_ktask *task;
 353        u8 *state;
 354        int err;
 355
 356        if (!par->vbe_state_size)
 357                return NULL;
 358
 359        state = kmalloc(par->vbe_state_size, GFP_KERNEL);
 360        if (!state)
 361                return ERR_PTR(-ENOMEM);
 362
 363        task = uvesafb_prep();
 364        if (!task) {
 365                kfree(state);
 366                return NULL;
 367        }
 368
 369        task->t.regs.eax = 0x4f04;
 370        task->t.regs.ecx = 0x000f;
 371        task->t.regs.edx = 0x0001;
 372        task->t.flags = TF_BUF_RET | TF_BUF_ESBX;
 373        task->t.buf_len = par->vbe_state_size;
 374        task->buf = state;
 375        err = uvesafb_exec(task);
 376
 377        if (err || (task->t.regs.eax & 0xffff) != 0x004f) {
 378                printk(KERN_WARNING "uvesafb: VBE get state call "
 379                                "failed (eax=0x%x, err=%d)\n",
 380                                task->t.regs.eax, err);
 381                kfree(state);
 382                state = NULL;
 383        }
 384
 385        uvesafb_free(task);
 386        return state;
 387}
 388
 389static void uvesafb_vbe_state_restore(struct uvesafb_par *par, u8 *state_buf)
 390{
 391        struct uvesafb_ktask *task;
 392        int err;
 393
 394        if (!state_buf)
 395                return;
 396
 397        task = uvesafb_prep();
 398        if (!task)
 399                return;
 400
 401        task->t.regs.eax = 0x4f04;
 402        task->t.regs.ecx = 0x000f;
 403        task->t.regs.edx = 0x0002;
 404        task->t.buf_len = par->vbe_state_size;
 405        task->t.flags = TF_BUF_ESBX;
 406        task->buf = state_buf;
 407
 408        err = uvesafb_exec(task);
 409        if (err || (task->t.regs.eax & 0xffff) != 0x004f)
 410                printk(KERN_WARNING "uvesafb: VBE state restore call "
 411                                "failed (eax=0x%x, err=%d)\n",
 412                                task->t.regs.eax, err);
 413
 414        uvesafb_free(task);
 415}
 416
 417static int uvesafb_vbe_getinfo(struct uvesafb_ktask *task,
 418                               struct uvesafb_par *par)
 419{
 420        int err;
 421
 422        task->t.regs.eax = 0x4f00;
 423        task->t.flags = TF_VBEIB;
 424        task->t.buf_len = sizeof(struct vbe_ib);
 425        task->buf = &par->vbe_ib;
 426        strncpy(par->vbe_ib.vbe_signature, "VBE2", 4);
 427
 428        err = uvesafb_exec(task);
 429        if (err || (task->t.regs.eax & 0xffff) != 0x004f) {
 430                printk(KERN_ERR "uvesafb: Getting VBE info block failed "
 431                                "(eax=0x%x, err=%d)\n", (u32)task->t.regs.eax,
 432                                err);
 433                return -EINVAL;
 434        }
 435
 436        if (par->vbe_ib.vbe_version < 0x0200) {
 437                printk(KERN_ERR "uvesafb: Sorry, pre-VBE 2.0 cards are "
 438                                "not supported.\n");
 439                return -EINVAL;
 440        }
 441
 442        if (!par->vbe_ib.mode_list_ptr) {
 443                printk(KERN_ERR "uvesafb: Missing mode list!\n");
 444                return -EINVAL;
 445        }
 446
 447        printk(KERN_INFO "uvesafb: ");
 448
 449        /*
 450         * Convert string pointers and the mode list pointer into
 451         * usable addresses. Print informational messages about the
 452         * video adapter and its vendor.
 453         */
 454        if (par->vbe_ib.oem_vendor_name_ptr)
 455                printk("%s, ",
 456                        ((char *)task->buf) + par->vbe_ib.oem_vendor_name_ptr);
 457
 458        if (par->vbe_ib.oem_product_name_ptr)
 459                printk("%s, ",
 460                        ((char *)task->buf) + par->vbe_ib.oem_product_name_ptr);
 461
 462        if (par->vbe_ib.oem_product_rev_ptr)
 463                printk("%s, ",
 464                        ((char *)task->buf) + par->vbe_ib.oem_product_rev_ptr);
 465
 466        if (par->vbe_ib.oem_string_ptr)
 467                printk("OEM: %s, ",
 468                        ((char *)task->buf) + par->vbe_ib.oem_string_ptr);
 469
 470        printk("VBE v%d.%d\n", ((par->vbe_ib.vbe_version & 0xff00) >> 8),
 471                        par->vbe_ib.vbe_version & 0xff);
 472
 473        return 0;
 474}
 475
 476static int uvesafb_vbe_getmodes(struct uvesafb_ktask *task,
 477                                struct uvesafb_par *par)
 478{
 479        int off = 0, err;
 480        u16 *mode;
 481
 482        par->vbe_modes_cnt = 0;
 483
 484        /* Count available modes. */
 485        mode = (u16 *) (((u8 *)&par->vbe_ib) + par->vbe_ib.mode_list_ptr);
 486        while (*mode != 0xffff) {
 487                par->vbe_modes_cnt++;
 488                mode++;
 489        }
 490
 491        par->vbe_modes = kzalloc(sizeof(struct vbe_mode_ib) *
 492                                par->vbe_modes_cnt, GFP_KERNEL);
 493        if (!par->vbe_modes)
 494                return -ENOMEM;
 495
 496        /* Get info about all available modes. */
 497        mode = (u16 *) (((u8 *)&par->vbe_ib) + par->vbe_ib.mode_list_ptr);
 498        while (*mode != 0xffff) {
 499                struct vbe_mode_ib *mib;
 500
 501                uvesafb_reset(task);
 502                task->t.regs.eax = 0x4f01;
 503                task->t.regs.ecx = (u32) *mode;
 504                task->t.flags = TF_BUF_RET | TF_BUF_ESDI;
 505                task->t.buf_len = sizeof(struct vbe_mode_ib);
 506                task->buf = par->vbe_modes + off;
 507
 508                err = uvesafb_exec(task);
 509                if (err || (task->t.regs.eax & 0xffff) != 0x004f) {
 510                        printk(KERN_WARNING "uvesafb: Getting mode info block "
 511                                "for mode 0x%x failed (eax=0x%x, err=%d)\n",
 512                                *mode, (u32)task->t.regs.eax, err);
 513                        mode++;
 514                        par->vbe_modes_cnt--;
 515                        continue;
 516                }
 517
 518                mib = task->buf;
 519                mib->mode_id = *mode;
 520
 521                /*
 522                 * We only want modes that are supported with the current
 523                 * hardware configuration, color, graphics and that have
 524                 * support for the LFB.
 525                 */
 526                if ((mib->mode_attr & VBE_MODE_MASK) == VBE_MODE_MASK &&
 527                                 mib->bits_per_pixel >= 8)
 528                        off++;
 529                else
 530                        par->vbe_modes_cnt--;
 531
 532                mode++;
 533                mib->depth = mib->red_len + mib->green_len + mib->blue_len;
 534
 535                /*
 536                 * Handle 8bpp modes and modes with broken color component
 537                 * lengths.
 538                 */
 539                if (mib->depth == 0 || (mib->depth == 24 &&
 540                                        mib->bits_per_pixel == 32))
 541                        mib->depth = mib->bits_per_pixel;
 542        }
 543
 544        if (par->vbe_modes_cnt > 0)
 545                return 0;
 546        else
 547                return -EINVAL;
 548}
 549
 550/*
 551 * The Protected Mode Interface is 32-bit x86 code, so we only run it on
 552 * x86 and not x86_64.
 553 */
 554#ifdef CONFIG_X86_32
 555static int uvesafb_vbe_getpmi(struct uvesafb_ktask *task,
 556                              struct uvesafb_par *par)
 557{
 558        int i, err;
 559
 560        uvesafb_reset(task);
 561        task->t.regs.eax = 0x4f0a;
 562        task->t.regs.ebx = 0x0;
 563        err = uvesafb_exec(task);
 564
 565        if ((task->t.regs.eax & 0xffff) != 0x4f || task->t.regs.es < 0xc000) {
 566                par->pmi_setpal = par->ypan = 0;
 567        } else {
 568                par->pmi_base = (u16 *)phys_to_virt(((u32)task->t.regs.es << 4)
 569                                                + task->t.regs.edi);
 570                par->pmi_start = (u8 *)par->pmi_base + par->pmi_base[1];
 571                par->pmi_pal = (u8 *)par->pmi_base + par->pmi_base[2];
 572                printk(KERN_INFO "uvesafb: protected mode interface info at "
 573                                 "%04x:%04x\n",
 574                                 (u16)task->t.regs.es, (u16)task->t.regs.edi);
 575                printk(KERN_INFO "uvesafb: pmi: set display start = %p, "
 576                                 "set palette = %p\n", par->pmi_start,
 577                                 par->pmi_pal);
 578
 579                if (par->pmi_base[3]) {
 580                        printk(KERN_INFO "uvesafb: pmi: ports = ");
 581                        for (i = par->pmi_base[3]/2;
 582                                        par->pmi_base[i] != 0xffff; i++)
 583                                printk("%x ", par->pmi_base[i]);
 584                        printk("\n");
 585
 586                        if (par->pmi_base[i] != 0xffff) {
 587                                printk(KERN_INFO "uvesafb: can't handle memory"
 588                                                 " requests, pmi disabled\n");
 589                                par->ypan = par->pmi_setpal = 0;
 590                        }
 591                }
 592        }
 593        return 0;
 594}
 595#endif /* CONFIG_X86_32 */
 596
 597/*
 598 * Check whether a video mode is supported by the Video BIOS and is
 599 * compatible with the monitor limits.
 600 */
 601static int uvesafb_is_valid_mode(struct fb_videomode *mode,
 602                                 struct fb_info *info)
 603{
 604        if (info->monspecs.gtf) {
 605                fb_videomode_to_var(&info->var, mode);
 606                if (fb_validate_mode(&info->var, info))
 607                        return 0;
 608        }
 609
 610        if (uvesafb_vbe_find_mode(info->par, mode->xres, mode->yres, 8,
 611                                UVESAFB_EXACT_RES) == -1)
 612                return 0;
 613
 614        return 1;
 615}
 616
 617static int uvesafb_vbe_getedid(struct uvesafb_ktask *task, struct fb_info *info)
 618{
 619        struct uvesafb_par *par = info->par;
 620        int err = 0;
 621
 622        if (noedid || par->vbe_ib.vbe_version < 0x0300)
 623                return -EINVAL;
 624
 625        task->t.regs.eax = 0x4f15;
 626        task->t.regs.ebx = 0;
 627        task->t.regs.ecx = 0;
 628        task->t.buf_len = 0;
 629        task->t.flags = 0;
 630
 631        err = uvesafb_exec(task);
 632
 633        if ((task->t.regs.eax & 0xffff) != 0x004f || err)
 634                return -EINVAL;
 635
 636        if ((task->t.regs.ebx & 0x3) == 3) {
 637                printk(KERN_INFO "uvesafb: VBIOS/hardware supports both "
 638                                 "DDC1 and DDC2 transfers\n");
 639        } else if ((task->t.regs.ebx & 0x3) == 2) {
 640                printk(KERN_INFO "uvesafb: VBIOS/hardware supports DDC2 "
 641                                 "transfers\n");
 642        } else if ((task->t.regs.ebx & 0x3) == 1) {
 643                printk(KERN_INFO "uvesafb: VBIOS/hardware supports DDC1 "
 644                                 "transfers\n");
 645        } else {
 646                printk(KERN_INFO "uvesafb: VBIOS/hardware doesn't support "
 647                                 "DDC transfers\n");
 648                return -EINVAL;
 649        }
 650
 651        task->t.regs.eax = 0x4f15;
 652        task->t.regs.ebx = 1;
 653        task->t.regs.ecx = task->t.regs.edx = 0;
 654        task->t.flags = TF_BUF_RET | TF_BUF_ESDI;
 655        task->t.buf_len = EDID_LENGTH;
 656        task->buf = kzalloc(EDID_LENGTH, GFP_KERNEL);
 657        if (!task->buf)
 658                return -ENOMEM;
 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
 682static void 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
 763static void 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
 792static int 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                if (__supported_pte_mask & _PAGE_NX) {
 817                        par->pmi_setpal = par->ypan = 0;
 818                        printk(KERN_WARNING "uvesafb: NX protection is active, "
 819                                            "better not use the PMI.\n");
 820                } else {
 821                        uvesafb_vbe_getpmi(task, par);
 822                }
 823        }
 824#else
 825        /* The protected mode interface is not available on non-x86. */
 826        par->pmi_setpal = par->ypan = 0;
 827#endif
 828
 829        INIT_LIST_HEAD(&info->modelist);
 830        uvesafb_vbe_getmonspecs(task, info);
 831        uvesafb_vbe_getstatesize(task, par);
 832
 833out:    uvesafb_free(task);
 834        return err;
 835}
 836
 837static int uvesafb_vbe_init_mode(struct fb_info *info)
 838{
 839        struct list_head *pos;
 840        struct fb_modelist *modelist;
 841        struct fb_videomode *mode;
 842        struct uvesafb_par *par = info->par;
 843        int i, modeid;
 844
 845        /* Has the user requested a specific VESA mode? */
 846        if (vbemode) {
 847                for (i = 0; i < par->vbe_modes_cnt; i++) {
 848                        if (par->vbe_modes[i].mode_id == vbemode) {
 849                                modeid = i;
 850                                uvesafb_setup_var(&info->var, info,
 851                                                &par->vbe_modes[modeid]);
 852                                fb_get_mode(FB_VSYNCTIMINGS | FB_IGNOREMON, 60,
 853                                                &info->var, info);
 854                                /*
 855                                 * With pixclock set to 0, the default BIOS
 856                                 * timings will be used in set_par().
 857                                 */
 858                                info->var.pixclock = 0;
 859                                goto gotmode;
 860                        }
 861                }
 862                printk(KERN_INFO "uvesafb: requested VBE mode 0x%x is "
 863                                 "unavailable\n", vbemode);
 864                vbemode = 0;
 865        }
 866
 867        /* Count the modes in the modelist */
 868        i = 0;
 869        list_for_each(pos, &info->modelist)
 870                i++;
 871
 872        /*
 873         * Convert the modelist into a modedb so that we can use it with
 874         * fb_find_mode().
 875         */
 876        mode = kzalloc(i * sizeof(*mode), GFP_KERNEL);
 877        if (mode) {
 878                i = 0;
 879                list_for_each(pos, &info->modelist) {
 880                        modelist = list_entry(pos, struct fb_modelist, list);
 881                        mode[i] = modelist->mode;
 882                        i++;
 883                }
 884
 885                if (!mode_option)
 886                        mode_option = UVESAFB_DEFAULT_MODE;
 887
 888                i = fb_find_mode(&info->var, info, mode_option, mode, i,
 889                        NULL, 8);
 890
 891                kfree(mode);
 892        }
 893
 894        /* fb_find_mode() failed */
 895        if (i == 0) {
 896                info->var.xres = 640;
 897                info->var.yres = 480;
 898                mode = (struct fb_videomode *)
 899                                fb_find_best_mode(&info->var, &info->modelist);
 900
 901                if (mode) {
 902                        fb_videomode_to_var(&info->var, mode);
 903                } else {
 904                        modeid = par->vbe_modes[0].mode_id;
 905                        uvesafb_setup_var(&info->var, info,
 906                                        &par->vbe_modes[modeid]);
 907                        fb_get_mode(FB_VSYNCTIMINGS | FB_IGNOREMON, 60,
 908                                        &info->var, info);
 909
 910                        goto gotmode;
 911                }
 912        }
 913
 914        /* Look for a matching VBE mode. */
 915        modeid = uvesafb_vbe_find_mode(par, info->var.xres, info->var.yres,
 916                        info->var.bits_per_pixel, UVESAFB_EXACT_RES);
 917
 918        if (modeid == -1)
 919                return -EINVAL;
 920
 921        uvesafb_setup_var(&info->var, info, &par->vbe_modes[modeid]);
 922
 923gotmode:
 924        /*
 925         * If we are not VBE3.0+ compliant, we're done -- the BIOS will
 926         * ignore our timings anyway.
 927         */
 928        if (par->vbe_ib.vbe_version < 0x0300 || par->nocrtc)
 929                fb_get_mode(FB_VSYNCTIMINGS | FB_IGNOREMON, 60,
 930                                        &info->var, info);
 931
 932        return modeid;
 933}
 934
 935static int uvesafb_setpalette(struct uvesafb_pal_entry *entries, int count,
 936                int start, struct fb_info *info)
 937{
 938        struct uvesafb_ktask *task;
 939#ifdef CONFIG_X86
 940        struct uvesafb_par *par = info->par;
 941        int i = par->mode_idx;
 942#endif
 943        int err = 0;
 944
 945        /*
 946         * We support palette modifications for 8 bpp modes only, so
 947         * there can never be more than 256 entries.
 948         */
 949        if (start + count > 256)
 950                return -EINVAL;
 951
 952#ifdef CONFIG_X86
 953        /* Use VGA registers if mode is VGA-compatible. */
 954        if (i >= 0 && i < par->vbe_modes_cnt &&
 955            par->vbe_modes[i].mode_attr & VBE_MODE_VGACOMPAT) {
 956                for (i = 0; i < count; i++) {
 957                        outb_p(start + i,        dac_reg);
 958                        outb_p(entries[i].red,   dac_val);
 959                        outb_p(entries[i].green, dac_val);
 960                        outb_p(entries[i].blue,  dac_val);
 961                }
 962        }
 963#ifdef CONFIG_X86_32
 964        else if (par->pmi_setpal) {
 965                __asm__ __volatile__(
 966                "call *(%%esi)"
 967                : /* no return value */
 968                : "a" (0x4f09),         /* EAX */
 969                  "b" (0),              /* EBX */
 970                  "c" (count),          /* ECX */
 971                  "d" (start),          /* EDX */
 972                  "D" (entries),        /* EDI */
 973                  "S" (&par->pmi_pal)); /* ESI */
 974        }
 975#endif /* CONFIG_X86_32 */
 976        else
 977#endif /* CONFIG_X86 */
 978        {
 979                task = uvesafb_prep();
 980                if (!task)
 981                        return -ENOMEM;
 982
 983                task->t.regs.eax = 0x4f09;
 984                task->t.regs.ebx = 0x0;
 985                task->t.regs.ecx = count;
 986                task->t.regs.edx = start;
 987                task->t.flags = TF_BUF_ESDI;
 988                task->t.buf_len = sizeof(struct uvesafb_pal_entry) * count;
 989                task->buf = entries;
 990
 991                err = uvesafb_exec(task);
 992                if ((task->t.regs.eax & 0xffff) != 0x004f)
 993                        err = 1;
 994
 995                uvesafb_free(task);
 996        }
 997        return err;
 998}
 999
1000static int uvesafb_setcolreg(unsigned regno, unsigned red, unsigned green,
1001                unsigned blue, unsigned transp,
1002                struct fb_info *info)
1003{
1004        struct uvesafb_pal_entry entry;
1005        int shift = 16 - dac_width;
1006        int err = 0;
1007
1008        if (regno >= info->cmap.len)
1009                return -EINVAL;
1010
1011        if (info->var.bits_per_pixel == 8) {
1012                entry.red   = red   >> shift;
1013                entry.green = green >> shift;
1014                entry.blue  = blue  >> shift;
1015                entry.pad   = 0;
1016
1017                err = uvesafb_setpalette(&entry, 1, regno, info);
1018        } else if (regno < 16) {
1019                switch (info->var.bits_per_pixel) {
1020                case 16:
1021                        if (info->var.red.offset == 10) {
1022                                /* 1:5:5:5 */
1023                                ((u32 *) (info->pseudo_palette))[regno] =
1024                                                ((red   & 0xf800) >>  1) |
1025                                                ((green & 0xf800) >>  6) |
1026                                                ((blue  & 0xf800) >> 11);
1027                        } else {
1028                                /* 0:5:6:5 */
1029                                ((u32 *) (info->pseudo_palette))[regno] =
1030                                                ((red   & 0xf800)      ) |
1031                                                ((green & 0xfc00) >>  5) |
1032                                                ((blue  & 0xf800) >> 11);
1033                        }
1034                        break;
1035
1036                case 24:
1037                case 32:
1038                        red   >>= 8;
1039                        green >>= 8;
1040                        blue  >>= 8;
1041                        ((u32 *)(info->pseudo_palette))[regno] =
1042                                (red   << info->var.red.offset)   |
1043                                (green << info->var.green.offset) |
1044                                (blue  << info->var.blue.offset);
1045                        break;
1046                }
1047        }
1048        return err;
1049}
1050
1051static int uvesafb_setcmap(struct fb_cmap *cmap, struct fb_info *info)
1052{
1053        struct uvesafb_pal_entry *entries;
1054        int shift = 16 - dac_width;
1055        int i, err = 0;
1056
1057        if (info->var.bits_per_pixel == 8) {
1058                if (cmap->start + cmap->len > info->cmap.start +
1059                    info->cmap.len || cmap->start < info->cmap.start)
1060                        return -EINVAL;
1061
1062                entries = kmalloc(sizeof(*entries) * cmap->len, GFP_KERNEL);
1063                if (!entries)
1064                        return -ENOMEM;
1065
1066                for (i = 0; i < cmap->len; i++) {
1067                        entries[i].red   = cmap->red[i]   >> shift;
1068                        entries[i].green = cmap->green[i] >> shift;
1069                        entries[i].blue  = cmap->blue[i]  >> shift;
1070                        entries[i].pad   = 0;
1071                }
1072                err = uvesafb_setpalette(entries, cmap->len, cmap->start, info);
1073                kfree(entries);
1074        } else {
1075                /*
1076                 * For modes with bpp > 8, we only set the pseudo palette in
1077                 * the fb_info struct. We rely on uvesafb_setcolreg to do all
1078                 * sanity checking.
1079                 */
1080                for (i = 0; i < cmap->len; i++) {
1081                        err |= uvesafb_setcolreg(cmap->start + i, cmap->red[i],
1082                                                cmap->green[i], cmap->blue[i],
1083                                                0, info);
1084                }
1085        }
1086        return err;
1087}
1088
1089static int uvesafb_pan_display(struct fb_var_screeninfo *var,
1090                struct fb_info *info)
1091{
1092#ifdef CONFIG_X86_32
1093        int offset;
1094        struct uvesafb_par *par = info->par;
1095
1096        offset = (var->yoffset * info->fix.line_length + var->xoffset) / 4;
1097
1098        /*
1099         * It turns out it's not the best idea to do panning via vm86,
1100         * so we only allow it if we have a PMI.
1101         */
1102        if (par->pmi_start) {
1103                __asm__ __volatile__(
1104                        "call *(%%edi)"
1105                        : /* no return value */
1106                        : "a" (0x4f07),         /* EAX */
1107                          "b" (0),              /* EBX */
1108                          "c" (offset),         /* ECX */
1109                          "d" (offset >> 16),   /* EDX */
1110                          "D" (&par->pmi_start));    /* EDI */
1111        }
1112#endif
1113        return 0;
1114}
1115
1116static int uvesafb_blank(int blank, struct fb_info *info)
1117{
1118        struct uvesafb_ktask *task;
1119        int err = 1;
1120#ifdef CONFIG_X86
1121        struct uvesafb_par *par = info->par;
1122
1123        if (par->vbe_ib.capabilities & VBE_CAP_VGACOMPAT) {
1124                int loop = 10000;
1125                u8 seq = 0, crtc17 = 0;
1126
1127                if (blank == FB_BLANK_POWERDOWN) {
1128                        seq = 0x20;
1129                        crtc17 = 0x00;
1130                        err = 0;
1131                } else {
1132                        seq = 0x00;
1133                        crtc17 = 0x80;
1134                        err = (blank == FB_BLANK_UNBLANK) ? 0 : -EINVAL;
1135                }
1136
1137                vga_wseq(NULL, 0x00, 0x01);
1138                seq |= vga_rseq(NULL, 0x01) & ~0x20;
1139                vga_wseq(NULL, 0x00, seq);
1140
1141                crtc17 |= vga_rcrt(NULL, 0x17) & ~0x80;
1142                while (loop--);
1143                vga_wcrt(NULL, 0x17, crtc17);
1144                vga_wseq(NULL, 0x00, 0x03);
1145        } else
1146#endif /* CONFIG_X86 */
1147        {
1148                task = uvesafb_prep();
1149                if (!task)
1150                        return -ENOMEM;
1151
1152                task->t.regs.eax = 0x4f10;
1153                switch (blank) {
1154                case FB_BLANK_UNBLANK:
1155                        task->t.regs.ebx = 0x0001;
1156                        break;
1157                case FB_BLANK_NORMAL:
1158                        task->t.regs.ebx = 0x0101;      /* standby */
1159                        break;
1160                case FB_BLANK_POWERDOWN:
1161                        task->t.regs.ebx = 0x0401;      /* powerdown */
1162                        break;
1163                default:
1164                        goto out;
1165                }
1166
1167                err = uvesafb_exec(task);
1168                if (err || (task->t.regs.eax & 0xffff) != 0x004f)
1169                        err = 1;
1170out:            uvesafb_free(task);
1171        }
1172        return err;
1173}
1174
1175static int uvesafb_open(struct fb_info *info, int user)
1176{
1177        struct uvesafb_par *par = info->par;
1178        int cnt = atomic_read(&par->ref_count);
1179        u8 *buf = NULL;
1180
1181        if (!cnt && par->vbe_state_size) {
1182                buf =  uvesafb_vbe_state_save(par);
1183                if (IS_ERR(buf)) {
1184                        printk(KERN_WARNING "uvesafb: save hardware state"
1185                                "failed, error code is %ld!\n", PTR_ERR(buf));
1186                } else {
1187                        par->vbe_state_orig = buf;
1188                }
1189        }
1190
1191        atomic_inc(&par->ref_count);
1192        return 0;
1193}
1194
1195static int uvesafb_release(struct fb_info *info, int user)
1196{
1197        struct uvesafb_ktask *task = NULL;
1198        struct uvesafb_par *par = info->par;
1199        int cnt = atomic_read(&par->ref_count);
1200
1201        if (!cnt)
1202                return -EINVAL;
1203
1204        if (cnt != 1)
1205                goto out;
1206
1207        task = uvesafb_prep();
1208        if (!task)
1209                goto out;
1210
1211        /* First, try to set the standard 80x25 text mode. */
1212        task->t.regs.eax = 0x0003;
1213        uvesafb_exec(task);
1214
1215        /*
1216         * Now try to restore whatever hardware state we might have
1217         * saved when the fb device was first opened.
1218         */
1219        uvesafb_vbe_state_restore(par, par->vbe_state_orig);
1220out:
1221        atomic_dec(&par->ref_count);
1222        uvesafb_free(task);
1223        return 0;
1224}
1225
1226static int uvesafb_set_par(struct fb_info *info)
1227{
1228        struct uvesafb_par *par = info->par;
1229        struct uvesafb_ktask *task = NULL;
1230        struct vbe_crtc_ib *crtc = NULL;
1231        struct vbe_mode_ib *mode = NULL;
1232        int i, err = 0, depth = info->var.bits_per_pixel;
1233
1234        if (depth > 8 && depth != 32)
1235                depth = info->var.red.length + info->var.green.length +
1236                        info->var.blue.length;
1237
1238        i = uvesafb_vbe_find_mode(par, info->var.xres, info->var.yres, depth,
1239                                 UVESAFB_EXACT_RES | UVESAFB_EXACT_DEPTH);
1240        if (i >= 0)
1241                mode = &par->vbe_modes[i];
1242        else
1243                return -EINVAL;
1244
1245        task = uvesafb_prep();
1246        if (!task)
1247                return -ENOMEM;
1248setmode:
1249        task->t.regs.eax = 0x4f02;
1250        task->t.regs.ebx = mode->mode_id | 0x4000;      /* use LFB */
1251
1252        if (par->vbe_ib.vbe_version >= 0x0300 && !par->nocrtc &&
1253            info->var.pixclock != 0) {
1254                task->t.regs.ebx |= 0x0800;             /* use CRTC data */
1255                task->t.flags = TF_BUF_ESDI;
1256                crtc = kzalloc(sizeof(struct vbe_crtc_ib), GFP_KERNEL);
1257                if (!crtc) {
1258                        err = -ENOMEM;
1259                        goto out;
1260                }
1261                crtc->horiz_start = info->var.xres + info->var.right_margin;
1262                crtc->horiz_end   = crtc->horiz_start + info->var.hsync_len;
1263                crtc->horiz_total = crtc->horiz_end + info->var.left_margin;
1264
1265                crtc->vert_start  = info->var.yres + info->var.lower_margin;
1266                crtc->vert_end    = crtc->vert_start + info->var.vsync_len;
1267                crtc->vert_total  = crtc->vert_end + info->var.upper_margin;
1268
1269                crtc->pixel_clock = PICOS2KHZ(info->var.pixclock) * 1000;
1270                crtc->refresh_rate = (u16)(100 * (crtc->pixel_clock /
1271                                (crtc->vert_total * crtc->horiz_total)));
1272
1273                if (info->var.vmode & FB_VMODE_DOUBLE)
1274                        crtc->flags |= 0x1;
1275                if (info->var.vmode & FB_VMODE_INTERLACED)
1276                        crtc->flags |= 0x2;
1277                if (!(info->var.sync & FB_SYNC_HOR_HIGH_ACT))
1278                        crtc->flags |= 0x4;
1279                if (!(info->var.sync & FB_SYNC_VERT_HIGH_ACT))
1280                        crtc->flags |= 0x8;
1281                memcpy(&par->crtc, crtc, sizeof(*crtc));
1282        } else {
1283                memset(&par->crtc, 0, sizeof(*crtc));
1284        }
1285
1286        task->t.buf_len = sizeof(struct vbe_crtc_ib);
1287        task->buf = &par->crtc;
1288
1289        err = uvesafb_exec(task);
1290        if (err || (task->t.regs.eax & 0xffff) != 0x004f) {
1291                /*
1292                 * The mode switch might have failed because we tried to
1293                 * use our own timings.  Try again with the default timings.
1294                 */
1295                if (crtc != NULL) {
1296                        printk(KERN_WARNING "uvesafb: mode switch failed "
1297                                "(eax=0x%x, err=%d). Trying again with "
1298                                "default timings.\n", task->t.regs.eax, err);
1299                        uvesafb_reset(task);
1300                        kfree(crtc);
1301                        crtc = NULL;
1302                        info->var.pixclock = 0;
1303                        goto setmode;
1304                } else {
1305                        printk(KERN_ERR "uvesafb: mode switch failed (eax="
1306                                "0x%x, err=%d)\n", task->t.regs.eax, err);
1307                        err = -EINVAL;
1308                        goto out;
1309                }
1310        }
1311        par->mode_idx = i;
1312
1313        /* For 8bpp modes, always try to set the DAC to 8 bits. */
1314        if (par->vbe_ib.capabilities & VBE_CAP_CAN_SWITCH_DAC &&
1315            mode->bits_per_pixel <= 8) {
1316                uvesafb_reset(task);
1317                task->t.regs.eax = 0x4f08;
1318                task->t.regs.ebx = 0x0800;
1319
1320                err = uvesafb_exec(task);
1321                if (err || (task->t.regs.eax & 0xffff) != 0x004f ||
1322                    ((task->t.regs.ebx & 0xff00) >> 8) != 8) {
1323                        dac_width = 6;
1324                } else {
1325                        dac_width = 8;
1326                }
1327        }
1328
1329        info->fix.visual = (info->var.bits_per_pixel == 8) ?
1330                                FB_VISUAL_PSEUDOCOLOR : FB_VISUAL_TRUECOLOR;
1331        info->fix.line_length = mode->bytes_per_scan_line;
1332
1333out:
1334        kfree(crtc);
1335        uvesafb_free(task);
1336
1337        return err;
1338}
1339
1340static void uvesafb_check_limits(struct fb_var_screeninfo *var,
1341                struct fb_info *info)
1342{
1343        const struct fb_videomode *mode;
1344        struct uvesafb_par *par = info->par;
1345
1346        /*
1347         * If pixclock is set to 0, then we're using default BIOS timings
1348         * and thus don't have to perform any checks here.
1349         */
1350        if (!var->pixclock)
1351                return;
1352
1353        if (par->vbe_ib.vbe_version < 0x0300) {
1354                fb_get_mode(FB_VSYNCTIMINGS | FB_IGNOREMON, 60, var, info);
1355                return;
1356        }
1357
1358        if (!fb_validate_mode(var, info))
1359                return;
1360
1361        mode = fb_find_best_mode(var, &info->modelist);
1362        if (mode) {
1363                if (mode->xres == var->xres && mode->yres == var->yres &&
1364                    !(mode->vmode & (FB_VMODE_INTERLACED | FB_VMODE_DOUBLE))) {
1365                        fb_videomode_to_var(var, mode);
1366                        return;
1367                }
1368        }
1369
1370        if (info->monspecs.gtf && !fb_get_mode(FB_MAXTIMINGS, 0, var, info))
1371                return;
1372        /* Use default refresh rate */
1373        var->pixclock = 0;
1374}
1375
1376static int uvesafb_check_var(struct fb_var_screeninfo *var,
1377                struct fb_info *info)
1378{
1379        struct uvesafb_par *par = info->par;
1380        struct vbe_mode_ib *mode = NULL;
1381        int match = -1;
1382        int depth = var->red.length + var->green.length + var->blue.length;
1383
1384        /*
1385         * Various apps will use bits_per_pixel to set the color depth,
1386         * which is theoretically incorrect, but which we'll try to handle
1387         * here.
1388         */
1389        if (depth == 0 || abs(depth - var->bits_per_pixel) >= 8)
1390                depth = var->bits_per_pixel;
1391
1392        match = uvesafb_vbe_find_mode(par, var->xres, var->yres, depth,
1393                                                UVESAFB_EXACT_RES);
1394        if (match == -1)
1395                return -EINVAL;
1396
1397        mode = &par->vbe_modes[match];
1398        uvesafb_setup_var(var, info, mode);
1399
1400        /*
1401         * Check whether we have remapped enough memory for this mode.
1402         * We might be called at an early stage, when we haven't remapped
1403         * any memory yet, in which case we simply skip the check.
1404         */
1405        if (var->yres * mode->bytes_per_scan_line > info->fix.smem_len
1406                                                && info->fix.smem_len)
1407                return -EINVAL;
1408
1409        if ((var->vmode & FB_VMODE_DOUBLE) &&
1410                                !(par->vbe_modes[match].mode_attr & 0x100))
1411                var->vmode &= ~FB_VMODE_DOUBLE;
1412
1413        if ((var->vmode & FB_VMODE_INTERLACED) &&
1414                                !(par->vbe_modes[match].mode_attr & 0x200))
1415                var->vmode &= ~FB_VMODE_INTERLACED;
1416
1417        uvesafb_check_limits(var, info);
1418
1419        var->xres_virtual = var->xres;
1420        var->yres_virtual = (par->ypan) ?
1421                                info->fix.smem_len / mode->bytes_per_scan_line :
1422                                var->yres;
1423        return 0;
1424}
1425
1426static struct fb_ops uvesafb_ops = {
1427        .owner          = THIS_MODULE,
1428        .fb_open        = uvesafb_open,
1429        .fb_release     = uvesafb_release,
1430        .fb_setcolreg   = uvesafb_setcolreg,
1431        .fb_setcmap     = uvesafb_setcmap,
1432        .fb_pan_display = uvesafb_pan_display,
1433        .fb_blank       = uvesafb_blank,
1434        .fb_fillrect    = cfb_fillrect,
1435        .fb_copyarea    = cfb_copyarea,
1436        .fb_imageblit   = cfb_imageblit,
1437        .fb_check_var   = uvesafb_check_var,
1438        .fb_set_par     = uvesafb_set_par,
1439};
1440
1441static void uvesafb_init_info(struct fb_info *info, struct vbe_mode_ib *mode)
1442{
1443        unsigned int size_vmode;
1444        unsigned int size_remap;
1445        unsigned int size_total;
1446        struct uvesafb_par *par = info->par;
1447        int i, h;
1448
1449        info->pseudo_palette = ((u8 *)info->par + sizeof(struct uvesafb_par));
1450        info->fix = uvesafb_fix;
1451        info->fix.ypanstep = par->ypan ? 1 : 0;
1452        info->fix.ywrapstep = (par->ypan > 1) ? 1 : 0;
1453
1454        /* Disable blanking if the user requested so. */
1455        if (!blank)
1456                info->fbops->fb_blank = NULL;
1457
1458        /*
1459         * Find out how much IO memory is required for the mode with
1460         * the highest resolution.
1461         */
1462        size_remap = 0;
1463        for (i = 0; i < par->vbe_modes_cnt; i++) {
1464                h = par->vbe_modes[i].bytes_per_scan_line *
1465                                        par->vbe_modes[i].y_res;
1466                if (h > size_remap)
1467                        size_remap = h;
1468        }
1469        size_remap *= 2;
1470
1471        /*
1472         *   size_vmode -- that is the amount of memory needed for the
1473         *                 used video mode, i.e. the minimum amount of
1474         *                 memory we need.
1475         */
1476        size_vmode = info->var.yres * mode->bytes_per_scan_line;
1477
1478        /*
1479         *   size_total -- all video memory we have. Used for mtrr
1480         *                 entries, resource allocation and bounds
1481         *                 checking.
1482         */
1483        size_total = par->vbe_ib.total_memory * 65536;
1484        if (vram_total)
1485                size_total = vram_total * 1024 * 1024;
1486        if (size_total < size_vmode)
1487                size_total = size_vmode;
1488
1489        /*
1490         *   size_remap -- the amount of video memory we are going to
1491         *                 use for vesafb.  With modern cards it is no
1492         *                 option to simply use size_total as th
1493         *                 wastes plenty of kernel address space.
1494         */
1495        if (vram_remap)
1496                size_remap = vram_remap * 1024 * 1024;
1497        if (size_remap < size_vmode)
1498                size_remap = size_vmode;
1499        if (size_remap > size_total)
1500                size_remap = size_total;
1501
1502        info->fix.smem_len = size_remap;
1503        info->fix.smem_start = mode->phys_base_ptr;
1504
1505        /*
1506         * We have to set yres_virtual here because when setup_var() was
1507         * called, smem_len wasn't defined yet.
1508         */
1509        info->var.yres_virtual = info->fix.smem_len /
1510                                 mode->bytes_per_scan_line;
1511
1512        if (par->ypan && info->var.yres_virtual > info->var.yres) {
1513                printk(KERN_INFO "uvesafb: scrolling: %s "
1514                        "using protected mode interface, "
1515                        "yres_virtual=%d\n",
1516                        (par->ypan > 1) ? "ywrap" : "ypan",
1517                        info->var.yres_virtual);
1518        } else {
1519                printk(KERN_INFO "uvesafb: scrolling: redraw\n");
1520                info->var.yres_virtual = info->var.yres;
1521                par->ypan = 0;
1522        }
1523
1524        info->flags = FBINFO_FLAG_DEFAULT |
1525                        (par->ypan ? FBINFO_HWACCEL_YPAN : 0);
1526
1527        if (!par->ypan)
1528                info->fbops->fb_pan_display = NULL;
1529}
1530
1531static void uvesafb_init_mtrr(struct fb_info *info)
1532{
1533        struct uvesafb_par *par = info->par;
1534
1535        if (mtrr && !(info->fix.smem_start & (PAGE_SIZE - 1))) {
1536                int temp_size = info->fix.smem_len;
1537
1538                int rc;
1539
1540                /* Find the largest power-of-two */
1541                temp_size = roundup_pow_of_two(temp_size);
1542
1543                /* Try and find a power of two to add */
1544                do {
1545                        rc = arch_phys_wc_add(info->fix.smem_start, temp_size);
1546                        temp_size >>= 1;
1547                } while (temp_size >= PAGE_SIZE && rc == -EINVAL);
1548
1549                if (rc >= 0)
1550                        par->mtrr_handle = rc;
1551        }
1552}
1553
1554static void uvesafb_ioremap(struct fb_info *info)
1555{
1556        info->screen_base = ioremap_wc(info->fix.smem_start, info->fix.smem_len);
1557}
1558
1559static ssize_t uvesafb_show_vbe_ver(struct device *dev,
1560                struct device_attribute *attr, char *buf)
1561{
1562        struct fb_info *info = platform_get_drvdata(to_platform_device(dev));
1563        struct uvesafb_par *par = info->par;
1564
1565        return snprintf(buf, PAGE_SIZE, "%.4x\n", par->vbe_ib.vbe_version);
1566}
1567
1568static DEVICE_ATTR(vbe_version, S_IRUGO, uvesafb_show_vbe_ver, NULL);
1569
1570static ssize_t uvesafb_show_vbe_modes(struct device *dev,
1571                struct device_attribute *attr, char *buf)
1572{
1573        struct fb_info *info = platform_get_drvdata(to_platform_device(dev));
1574        struct uvesafb_par *par = info->par;
1575        int ret = 0, i;
1576
1577        for (i = 0; i < par->vbe_modes_cnt && ret < PAGE_SIZE; i++) {
1578                ret += snprintf(buf + ret, PAGE_SIZE - ret,
1579                        "%dx%d-%d, 0x%.4x\n",
1580                        par->vbe_modes[i].x_res, par->vbe_modes[i].y_res,
1581                        par->vbe_modes[i].depth, par->vbe_modes[i].mode_id);
1582        }
1583
1584        return ret;
1585}
1586
1587static DEVICE_ATTR(vbe_modes, S_IRUGO, uvesafb_show_vbe_modes, NULL);
1588
1589static ssize_t uvesafb_show_vendor(struct device *dev,
1590                struct device_attribute *attr, char *buf)
1591{
1592        struct fb_info *info = platform_get_drvdata(to_platform_device(dev));
1593        struct uvesafb_par *par = info->par;
1594
1595        if (par->vbe_ib.oem_vendor_name_ptr)
1596                return snprintf(buf, PAGE_SIZE, "%s\n", (char *)
1597                        (&par->vbe_ib) + par->vbe_ib.oem_vendor_name_ptr);
1598        else
1599                return 0;
1600}
1601
1602static DEVICE_ATTR(oem_vendor, S_IRUGO, uvesafb_show_vendor, NULL);
1603
1604static ssize_t uvesafb_show_product_name(struct device *dev,
1605                struct device_attribute *attr, char *buf)
1606{
1607        struct fb_info *info = platform_get_drvdata(to_platform_device(dev));
1608        struct uvesafb_par *par = info->par;
1609
1610        if (par->vbe_ib.oem_product_name_ptr)
1611                return snprintf(buf, PAGE_SIZE, "%s\n", (char *)
1612                        (&par->vbe_ib) + par->vbe_ib.oem_product_name_ptr);
1613        else
1614                return 0;
1615}
1616
1617static DEVICE_ATTR(oem_product_name, S_IRUGO, uvesafb_show_product_name, NULL);
1618
1619static ssize_t uvesafb_show_product_rev(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
1625        if (par->vbe_ib.oem_product_rev_ptr)
1626                return snprintf(buf, PAGE_SIZE, "%s\n", (char *)
1627                        (&par->vbe_ib) + par->vbe_ib.oem_product_rev_ptr);
1628        else
1629                return 0;
1630}
1631
1632static DEVICE_ATTR(oem_product_rev, S_IRUGO, uvesafb_show_product_rev, NULL);
1633
1634static ssize_t uvesafb_show_oem_string(struct device *dev,
1635                struct device_attribute *attr, char *buf)
1636{
1637        struct fb_info *info = platform_get_drvdata(to_platform_device(dev));
1638        struct uvesafb_par *par = info->par;
1639
1640        if (par->vbe_ib.oem_string_ptr)
1641                return snprintf(buf, PAGE_SIZE, "%s\n",
1642                        (char *)(&par->vbe_ib) + par->vbe_ib.oem_string_ptr);
1643        else
1644                return 0;
1645}
1646
1647static DEVICE_ATTR(oem_string, S_IRUGO, uvesafb_show_oem_string, NULL);
1648
1649static ssize_t uvesafb_show_nocrtc(struct device *dev,
1650                struct device_attribute *attr, char *buf)
1651{
1652        struct fb_info *info = platform_get_drvdata(to_platform_device(dev));
1653        struct uvesafb_par *par = info->par;
1654
1655        return snprintf(buf, PAGE_SIZE, "%d\n", par->nocrtc);
1656}
1657
1658static ssize_t uvesafb_store_nocrtc(struct device *dev,
1659                struct device_attribute *attr, const char *buf, size_t count)
1660{
1661        struct fb_info *info = platform_get_drvdata(to_platform_device(dev));
1662        struct uvesafb_par *par = info->par;
1663
1664        if (count > 0) {
1665                if (buf[0] == '0')
1666                        par->nocrtc = 0;
1667                else
1668                        par->nocrtc = 1;
1669        }
1670        return count;
1671}
1672
1673static DEVICE_ATTR(nocrtc, S_IRUGO | S_IWUSR, uvesafb_show_nocrtc,
1674                        uvesafb_store_nocrtc);
1675
1676static struct attribute *uvesafb_dev_attrs[] = {
1677        &dev_attr_vbe_version.attr,
1678        &dev_attr_vbe_modes.attr,
1679        &dev_attr_oem_vendor.attr,
1680        &dev_attr_oem_product_name.attr,
1681        &dev_attr_oem_product_rev.attr,
1682        &dev_attr_oem_string.attr,
1683        &dev_attr_nocrtc.attr,
1684        NULL,
1685};
1686
1687static struct attribute_group uvesafb_dev_attgrp = {
1688        .name = NULL,
1689        .attrs = uvesafb_dev_attrs,
1690};
1691
1692static int uvesafb_probe(struct platform_device *dev)
1693{
1694        struct fb_info *info;
1695        struct vbe_mode_ib *mode = NULL;
1696        struct uvesafb_par *par;
1697        int err = 0, i;
1698
1699        info = framebuffer_alloc(sizeof(*par) + sizeof(u32) * 256, &dev->dev);
1700        if (!info)
1701                return -ENOMEM;
1702
1703        par = info->par;
1704
1705        err = uvesafb_vbe_init(info);
1706        if (err) {
1707                printk(KERN_ERR "uvesafb: vbe_init() failed with %d\n", err);
1708                goto out;
1709        }
1710
1711        info->fbops = &uvesafb_ops;
1712
1713        i = uvesafb_vbe_init_mode(info);
1714        if (i < 0) {
1715                err = -EINVAL;
1716                goto out;
1717        } else {
1718                mode = &par->vbe_modes[i];
1719        }
1720
1721        if (fb_alloc_cmap(&info->cmap, 256, 0) < 0) {
1722                err = -ENXIO;
1723                goto out;
1724        }
1725
1726        uvesafb_init_info(info, mode);
1727
1728        if (!request_region(0x3c0, 32, "uvesafb")) {
1729                printk(KERN_ERR "uvesafb: request region 0x3c0-0x3e0 failed\n");
1730                err = -EIO;
1731                goto out_mode;
1732        }
1733
1734        if (!request_mem_region(info->fix.smem_start, info->fix.smem_len,
1735                                "uvesafb")) {
1736                printk(KERN_ERR "uvesafb: cannot reserve video memory at "
1737                                "0x%lx\n", info->fix.smem_start);
1738                err = -EIO;
1739                goto out_reg;
1740        }
1741
1742        uvesafb_init_mtrr(info);
1743        uvesafb_ioremap(info);
1744
1745        if (!info->screen_base) {
1746                printk(KERN_ERR
1747                        "uvesafb: abort, cannot ioremap 0x%x bytes of video "
1748                        "memory at 0x%lx\n",
1749                        info->fix.smem_len, info->fix.smem_start);
1750                err = -EIO;
1751                goto out_mem;
1752        }
1753
1754        platform_set_drvdata(dev, info);
1755
1756        if (register_framebuffer(info) < 0) {
1757                printk(KERN_ERR
1758                        "uvesafb: failed to register framebuffer device\n");
1759                err = -EINVAL;
1760                goto out_unmap;
1761        }
1762
1763        printk(KERN_INFO "uvesafb: framebuffer at 0x%lx, mapped to 0x%p, "
1764                        "using %dk, total %dk\n", info->fix.smem_start,
1765                        info->screen_base, info->fix.smem_len/1024,
1766                        par->vbe_ib.total_memory * 64);
1767        fb_info(info, "%s frame buffer device\n", info->fix.id);
1768
1769        err = sysfs_create_group(&dev->dev.kobj, &uvesafb_dev_attgrp);
1770        if (err != 0)
1771                fb_warn(info, "failed to register attributes\n");
1772
1773        return 0;
1774
1775out_unmap:
1776        iounmap(info->screen_base);
1777out_mem:
1778        release_mem_region(info->fix.smem_start, info->fix.smem_len);
1779out_reg:
1780        release_region(0x3c0, 32);
1781out_mode:
1782        if (!list_empty(&info->modelist))
1783                fb_destroy_modelist(&info->modelist);
1784        fb_destroy_modedb(info->monspecs.modedb);
1785        fb_dealloc_cmap(&info->cmap);
1786out:
1787        kfree(par->vbe_modes);
1788
1789        framebuffer_release(info);
1790        return err;
1791}
1792
1793static int uvesafb_remove(struct platform_device *dev)
1794{
1795        struct fb_info *info = platform_get_drvdata(dev);
1796
1797        if (info) {
1798                struct uvesafb_par *par = info->par;
1799
1800                sysfs_remove_group(&dev->dev.kobj, &uvesafb_dev_attgrp);
1801                unregister_framebuffer(info);
1802                release_region(0x3c0, 32);
1803                iounmap(info->screen_base);
1804                arch_phys_wc_del(par->mtrr_handle);
1805                release_mem_region(info->fix.smem_start, info->fix.smem_len);
1806                fb_destroy_modedb(info->monspecs.modedb);
1807                fb_dealloc_cmap(&info->cmap);
1808
1809                kfree(par->vbe_modes);
1810                kfree(par->vbe_state_orig);
1811                kfree(par->vbe_state_saved);
1812
1813                framebuffer_release(info);
1814        }
1815        return 0;
1816}
1817
1818static struct platform_driver uvesafb_driver = {
1819        .probe  = uvesafb_probe,
1820        .remove = uvesafb_remove,
1821        .driver = {
1822                .name = "uvesafb",
1823        },
1824};
1825
1826static struct platform_device *uvesafb_device;
1827
1828#ifndef MODULE
1829static int uvesafb_setup(char *options)
1830{
1831        char *this_opt;
1832
1833        if (!options || !*options)
1834                return 0;
1835
1836        while ((this_opt = strsep(&options, ",")) != NULL) {
1837                if (!*this_opt) continue;
1838
1839                if (!strcmp(this_opt, "redraw"))
1840                        ypan = 0;
1841                else if (!strcmp(this_opt, "ypan"))
1842                        ypan = 1;
1843                else if (!strcmp(this_opt, "ywrap"))
1844                        ypan = 2;
1845                else if (!strcmp(this_opt, "vgapal"))
1846                        pmi_setpal = 0;
1847                else if (!strcmp(this_opt, "pmipal"))
1848                        pmi_setpal = 1;
1849                else if (!strncmp(this_opt, "mtrr:", 5))
1850                        mtrr = simple_strtoul(this_opt+5, NULL, 0);
1851                else if (!strcmp(this_opt, "nomtrr"))
1852                        mtrr = 0;
1853                else if (!strcmp(this_opt, "nocrtc"))
1854                        nocrtc = 1;
1855                else if (!strcmp(this_opt, "noedid"))
1856                        noedid = 1;
1857                else if (!strcmp(this_opt, "noblank"))
1858                        blank = 0;
1859                else if (!strncmp(this_opt, "vtotal:", 7))
1860                        vram_total = simple_strtoul(this_opt + 7, NULL, 0);
1861                else if (!strncmp(this_opt, "vremap:", 7))
1862                        vram_remap = simple_strtoul(this_opt + 7, NULL, 0);
1863                else if (!strncmp(this_opt, "maxhf:", 6))
1864                        maxhf = simple_strtoul(this_opt + 6, NULL, 0);
1865                else if (!strncmp(this_opt, "maxvf:", 6))
1866                        maxvf = simple_strtoul(this_opt + 6, NULL, 0);
1867                else if (!strncmp(this_opt, "maxclk:", 7))
1868                        maxclk = simple_strtoul(this_opt + 7, NULL, 0);
1869                else if (!strncmp(this_opt, "vbemode:", 8))
1870                        vbemode = simple_strtoul(this_opt + 8, NULL, 0);
1871                else if (this_opt[0] >= '0' && this_opt[0] <= '9') {
1872                        mode_option = this_opt;
1873                } else {
1874                        printk(KERN_WARNING
1875                                "uvesafb: unrecognized option %s\n", this_opt);
1876                }
1877        }
1878
1879        if (mtrr != 3 && mtrr != 0)
1880                pr_warn("uvesafb: mtrr should be set to 0 or 3; %d is unsupported", mtrr);
1881
1882        return 0;
1883}
1884#endif /* !MODULE */
1885
1886static ssize_t show_v86d(struct device_driver *dev, char *buf)
1887{
1888        return snprintf(buf, PAGE_SIZE, "%s\n", v86d_path);
1889}
1890
1891static ssize_t store_v86d(struct device_driver *dev, const char *buf,
1892                size_t count)
1893{
1894        strncpy(v86d_path, buf, PATH_MAX);
1895        return count;
1896}
1897
1898static DRIVER_ATTR(v86d, S_IRUGO | S_IWUSR, show_v86d, store_v86d);
1899
1900static int uvesafb_init(void)
1901{
1902        int err;
1903
1904#ifndef MODULE
1905        char *option = NULL;
1906
1907        if (fb_get_options("uvesafb", &option))
1908                return -ENODEV;
1909        uvesafb_setup(option);
1910#endif
1911        err = cn_add_callback(&uvesafb_cn_id, "uvesafb", uvesafb_cn_callback);
1912        if (err)
1913                return err;
1914
1915        err = platform_driver_register(&uvesafb_driver);
1916
1917        if (!err) {
1918                uvesafb_device = platform_device_alloc("uvesafb", 0);
1919                if (uvesafb_device)
1920                        err = platform_device_add(uvesafb_device);
1921                else
1922                        err = -ENOMEM;
1923
1924                if (err) {
1925                        platform_device_put(uvesafb_device);
1926                        platform_driver_unregister(&uvesafb_driver);
1927                        cn_del_callback(&uvesafb_cn_id);
1928                        return err;
1929                }
1930
1931                err = driver_create_file(&uvesafb_driver.driver,
1932                                &driver_attr_v86d);
1933                if (err) {
1934                        printk(KERN_WARNING "uvesafb: failed to register "
1935                                        "attributes\n");
1936                        err = 0;
1937                }
1938        }
1939        return err;
1940}
1941
1942module_init(uvesafb_init);
1943
1944static void uvesafb_exit(void)
1945{
1946        struct uvesafb_ktask *task;
1947
1948        if (v86d_started) {
1949                task = uvesafb_prep();
1950                if (task) {
1951                        task->t.flags = TF_EXIT;
1952                        uvesafb_exec(task);
1953                        uvesafb_free(task);
1954                }
1955        }
1956
1957        cn_del_callback(&uvesafb_cn_id);
1958        driver_remove_file(&uvesafb_driver.driver, &driver_attr_v86d);
1959        platform_device_unregister(uvesafb_device);
1960        platform_driver_unregister(&uvesafb_driver);
1961}
1962
1963module_exit(uvesafb_exit);
1964
1965static int param_set_scroll(const char *val, const struct kernel_param *kp)
1966{
1967        ypan = 0;
1968
1969        if (!strcmp(val, "redraw"))
1970                ypan = 0;
1971        else if (!strcmp(val, "ypan"))
1972                ypan = 1;
1973        else if (!strcmp(val, "ywrap"))
1974                ypan = 2;
1975        else
1976                return -EINVAL;
1977
1978        return 0;
1979}
1980static const struct kernel_param_ops param_ops_scroll = {
1981        .set = param_set_scroll,
1982};
1983#define param_check_scroll(name, p) __param_check(name, p, void)
1984
1985module_param_named(scroll, ypan, scroll, 0);
1986MODULE_PARM_DESC(scroll,
1987        "Scrolling mode, set to 'redraw', 'ypan', or 'ywrap'");
1988module_param_named(vgapal, pmi_setpal, invbool, 0);
1989MODULE_PARM_DESC(vgapal, "Set palette using VGA registers");
1990module_param_named(pmipal, pmi_setpal, bool, 0);
1991MODULE_PARM_DESC(pmipal, "Set palette using PMI calls");
1992module_param(mtrr, uint, 0);
1993MODULE_PARM_DESC(mtrr,
1994        "Memory Type Range Registers setting. Use 0 to disable.");
1995module_param(blank, bool, 0);
1996MODULE_PARM_DESC(blank, "Enable hardware blanking");
1997module_param(nocrtc, bool, 0);
1998MODULE_PARM_DESC(nocrtc, "Ignore CRTC timings when setting modes");
1999module_param(noedid, bool, 0);
2000MODULE_PARM_DESC(noedid,
2001        "Ignore EDID-provided monitor limits when setting modes");
2002module_param(vram_remap, uint, 0);
2003MODULE_PARM_DESC(vram_remap, "Set amount of video memory to be used [MiB]");
2004module_param(vram_total, uint, 0);
2005MODULE_PARM_DESC(vram_total, "Set total amount of video memoery [MiB]");
2006module_param(maxclk, ushort, 0);
2007MODULE_PARM_DESC(maxclk, "Maximum pixelclock [MHz], overrides EDID data");
2008module_param(maxhf, ushort, 0);
2009MODULE_PARM_DESC(maxhf,
2010        "Maximum horizontal frequency [kHz], overrides EDID data");
2011module_param(maxvf, ushort, 0);
2012MODULE_PARM_DESC(maxvf,
2013        "Maximum vertical frequency [Hz], overrides EDID data");
2014module_param(mode_option, charp, 0);
2015MODULE_PARM_DESC(mode_option,
2016        "Specify initial video mode as \"<xres>x<yres>[-<bpp>][@<refresh>]\"");
2017module_param(vbemode, ushort, 0);
2018MODULE_PARM_DESC(vbemode,
2019        "VBE mode number to set, overrides the 'mode' option");
2020module_param_string(v86d, v86d_path, PATH_MAX, 0660);
2021MODULE_PARM_DESC(v86d, "Path to the v86d userspace helper.");
2022
2023MODULE_LICENSE("GPL");
2024MODULE_AUTHOR("Michal Januszewski <spock@gentoo.org>");
2025MODULE_DESCRIPTION("Framebuffer driver for VBE2.0+ compliant graphics boards");
2026
2027