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 = {
  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         = 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  = true; /* use PMI for palette changes */
  50static bool nocrtc;             /* ignore CRTC settings */
  51static bool noedid;             /* don't try DDC transfers */
  52static int vram_remap;          /* set amt. of memory to be used */
  53static int vram_total;          /* set total amount of memory */
  54static u16 maxclk;              /* maximum pixel clock */
  55static u16 maxvf;               /* maximum vertical frequency */
  56static u16 maxhf;               /* maximum horizontal frequency */
  57static u16 vbemode;             /* force use of a specific VBE mode */
  58static char *mode_option;
  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 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 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 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 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 uvesafb_vbe_getedid(struct uvesafb_ktask *task, struct fb_info *info)
 622{
 623        struct uvesafb_par *par = info->par;
 624        int err = 0;
 625
 626        if (noedid || par->vbe_ib.vbe_version < 0x0300)
 627                return -EINVAL;
 628
 629        task->t.regs.eax = 0x4f15;
 630        task->t.regs.ebx = 0;
 631        task->t.regs.ecx = 0;
 632        task->t.buf_len = 0;
 633        task->t.flags = 0;
 634
 635        err = uvesafb_exec(task);
 636
 637        if ((task->t.regs.eax & 0xffff) != 0x004f || err)
 638                return -EINVAL;
 639
 640        if ((task->t.regs.ebx & 0x3) == 3) {
 641                printk(KERN_INFO "uvesafb: VBIOS/hardware supports both "
 642                                 "DDC1 and DDC2 transfers\n");
 643        } else if ((task->t.regs.ebx & 0x3) == 2) {
 644                printk(KERN_INFO "uvesafb: VBIOS/hardware supports DDC2 "
 645                                 "transfers\n");
 646        } else if ((task->t.regs.ebx & 0x3) == 1) {
 647                printk(KERN_INFO "uvesafb: VBIOS/hardware supports DDC1 "
 648                                 "transfers\n");
 649        } else {
 650                printk(KERN_INFO "uvesafb: VBIOS/hardware doesn't support "
 651                                 "DDC transfers\n");
 652                return -EINVAL;
 653        }
 654
 655        task->t.regs.eax = 0x4f15;
 656        task->t.regs.ebx = 1;
 657        task->t.regs.ecx = task->t.regs.edx = 0;
 658        task->t.flags = TF_BUF_RET | TF_BUF_ESDI;
 659        task->t.buf_len = EDID_LENGTH;
 660        task->buf = kzalloc(EDID_LENGTH, GFP_KERNEL);
 661        if (!task->buf)
 662                return -ENOMEM;
 663
 664        err = uvesafb_exec(task);
 665
 666        if ((task->t.regs.eax & 0xffff) == 0x004f && !err) {
 667                fb_edid_to_monspecs(task->buf, &info->monspecs);
 668
 669                if (info->monspecs.vfmax && info->monspecs.hfmax) {
 670                        /*
 671                         * If the maximum pixel clock wasn't specified in
 672                         * the EDID block, set it to 300 MHz.
 673                         */
 674                        if (info->monspecs.dclkmax == 0)
 675                                info->monspecs.dclkmax = 300 * 1000000;
 676                        info->monspecs.gtf = 1;
 677                }
 678        } else {
 679                err = -EINVAL;
 680        }
 681
 682        kfree(task->buf);
 683        return err;
 684}
 685
 686static void uvesafb_vbe_getmonspecs(struct uvesafb_ktask *task,
 687                                    struct fb_info *info)
 688{
 689        struct uvesafb_par *par = info->par;
 690        int i;
 691
 692        memset(&info->monspecs, 0, sizeof(info->monspecs));
 693
 694        /*
 695         * If we don't get all necessary data from the EDID block,
 696         * mark it as incompatible with the GTF and set nocrtc so
 697         * that we always use the default BIOS refresh rate.
 698         */
 699        if (uvesafb_vbe_getedid(task, info)) {
 700                info->monspecs.gtf = 0;
 701                par->nocrtc = 1;
 702        }
 703
 704        /* Kernel command line overrides. */
 705        if (maxclk)
 706                info->monspecs.dclkmax = maxclk * 1000000;
 707        if (maxvf)
 708                info->monspecs.vfmax = maxvf;
 709        if (maxhf)
 710                info->monspecs.hfmax = maxhf * 1000;
 711
 712        /*
 713         * In case DDC transfers are not supported, the user can provide
 714         * monitor limits manually. Lower limits are set to "safe" values.
 715         */
 716        if (info->monspecs.gtf == 0 && maxclk && maxvf && maxhf) {
 717                info->monspecs.dclkmin = 0;
 718                info->monspecs.vfmin = 60;
 719                info->monspecs.hfmin = 29000;
 720                info->monspecs.gtf = 1;
 721                par->nocrtc = 0;
 722        }
 723
 724        if (info->monspecs.gtf)
 725                printk(KERN_INFO
 726                        "uvesafb: monitor limits: vf = %d Hz, hf = %d kHz, "
 727                        "clk = %d MHz\n", info->monspecs.vfmax,
 728                        (int)(info->monspecs.hfmax / 1000),
 729                        (int)(info->monspecs.dclkmax / 1000000));
 730        else
 731                printk(KERN_INFO "uvesafb: no monitor limits have been set, "
 732                                 "default refresh rate will be used\n");
 733
 734        /* Add VBE modes to the modelist. */
 735        for (i = 0; i < par->vbe_modes_cnt; i++) {
 736                struct fb_var_screeninfo var;
 737                struct vbe_mode_ib *mode;
 738                struct fb_videomode vmode;
 739
 740                mode = &par->vbe_modes[i];
 741                memset(&var, 0, sizeof(var));
 742
 743                var.xres = mode->x_res;
 744                var.yres = mode->y_res;
 745
 746                fb_get_mode(FB_VSYNCTIMINGS | FB_IGNOREMON, 60, &var, info);
 747                fb_var_to_videomode(&vmode, &var);
 748                fb_add_videomode(&vmode, &info->modelist);
 749        }
 750
 751        /* Add valid VESA modes to our modelist. */
 752        for (i = 0; i < VESA_MODEDB_SIZE; i++) {
 753                if (uvesafb_is_valid_mode((struct fb_videomode *)
 754                                                &vesa_modes[i], info))
 755                        fb_add_videomode(&vesa_modes[i], &info->modelist);
 756        }
 757
 758        for (i = 0; i < info->monspecs.modedb_len; i++) {
 759                if (uvesafb_is_valid_mode(&info->monspecs.modedb[i], info))
 760                        fb_add_videomode(&info->monspecs.modedb[i],
 761                                        &info->modelist);
 762        }
 763
 764        return;
 765}
 766
 767static void uvesafb_vbe_getstatesize(struct uvesafb_ktask *task,
 768                                     struct uvesafb_par *par)
 769{
 770        int err;
 771
 772        uvesafb_reset(task);
 773
 774        /*
 775         * Get the VBE state buffer size. We want all available
 776         * hardware state data (CL = 0x0f).
 777         */
 778        task->t.regs.eax = 0x4f04;
 779        task->t.regs.ecx = 0x000f;
 780        task->t.regs.edx = 0x0000;
 781        task->t.flags = 0;
 782
 783        err = uvesafb_exec(task);
 784
 785        if (err || (task->t.regs.eax & 0xffff) != 0x004f) {
 786                printk(KERN_WARNING "uvesafb: VBE state buffer size "
 787                        "cannot be determined (eax=0x%x, err=%d)\n",
 788                        task->t.regs.eax, err);
 789                par->vbe_state_size = 0;
 790                return;
 791        }
 792
 793        par->vbe_state_size = 64 * (task->t.regs.ebx & 0xffff);
 794}
 795
 796static int uvesafb_vbe_init(struct fb_info *info)
 797{
 798        struct uvesafb_ktask *task = NULL;
 799        struct uvesafb_par *par = info->par;
 800        int err;
 801
 802        task = uvesafb_prep();
 803        if (!task)
 804                return -ENOMEM;
 805
 806        err = uvesafb_vbe_getinfo(task, par);
 807        if (err)
 808                goto out;
 809
 810        err = uvesafb_vbe_getmodes(task, par);
 811        if (err)
 812                goto out;
 813
 814        par->nocrtc = nocrtc;
 815#ifdef CONFIG_X86_32
 816        par->pmi_setpal = pmi_setpal;
 817        par->ypan = ypan;
 818
 819        if (par->pmi_setpal || par->ypan) {
 820                if (__supported_pte_mask & _PAGE_NX) {
 821                        par->pmi_setpal = par->ypan = 0;
 822                        printk(KERN_WARNING "uvesafb: NX protection is actively."
 823                                "We have better not to use the PMI.\n");
 824                } else {
 825                        uvesafb_vbe_getpmi(task, par);
 826                }
 827        }
 828#else
 829        /* The protected mode interface is not available on non-x86. */
 830        par->pmi_setpal = par->ypan = 0;
 831#endif
 832
 833        INIT_LIST_HEAD(&info->modelist);
 834        uvesafb_vbe_getmonspecs(task, info);
 835        uvesafb_vbe_getstatesize(task, par);
 836
 837out:    uvesafb_free(task);
 838        return err;
 839}
 840
 841static int uvesafb_vbe_init_mode(struct fb_info *info)
 842{
 843        struct list_head *pos;
 844        struct fb_modelist *modelist;
 845        struct fb_videomode *mode;
 846        struct uvesafb_par *par = info->par;
 847        int i, modeid;
 848
 849        /* Has the user requested a specific VESA mode? */
 850        if (vbemode) {
 851                for (i = 0; i < par->vbe_modes_cnt; i++) {
 852                        if (par->vbe_modes[i].mode_id == vbemode) {
 853                                modeid = i;
 854                                uvesafb_setup_var(&info->var, info,
 855                                                &par->vbe_modes[modeid]);
 856                                fb_get_mode(FB_VSYNCTIMINGS | FB_IGNOREMON, 60,
 857                                                &info->var, info);
 858                                /*
 859                                 * With pixclock set to 0, the default BIOS
 860                                 * timings will be used in set_par().
 861                                 */
 862                                info->var.pixclock = 0;
 863                                goto gotmode;
 864                        }
 865                }
 866                printk(KERN_INFO "uvesafb: requested VBE mode 0x%x is "
 867                                 "unavailable\n", vbemode);
 868                vbemode = 0;
 869        }
 870
 871        /* Count the modes in the modelist */
 872        i = 0;
 873        list_for_each(pos, &info->modelist)
 874                i++;
 875
 876        /*
 877         * Convert the modelist into a modedb so that we can use it with
 878         * fb_find_mode().
 879         */
 880        mode = kzalloc(i * sizeof(*mode), GFP_KERNEL);
 881        if (mode) {
 882                i = 0;
 883                list_for_each(pos, &info->modelist) {
 884                        modelist = list_entry(pos, struct fb_modelist, list);
 885                        mode[i] = modelist->mode;
 886                        i++;
 887                }
 888
 889                if (!mode_option)
 890                        mode_option = UVESAFB_DEFAULT_MODE;
 891
 892                i = fb_find_mode(&info->var, info, mode_option, mode, i,
 893                        NULL, 8);
 894
 895                kfree(mode);
 896        }
 897
 898        /* fb_find_mode() failed */
 899        if (i == 0) {
 900                info->var.xres = 640;
 901                info->var.yres = 480;
 902                mode = (struct fb_videomode *)
 903                                fb_find_best_mode(&info->var, &info->modelist);
 904
 905                if (mode) {
 906                        fb_videomode_to_var(&info->var, mode);
 907                } else {
 908                        modeid = par->vbe_modes[0].mode_id;
 909                        uvesafb_setup_var(&info->var, info,
 910                                        &par->vbe_modes[modeid]);
 911                        fb_get_mode(FB_VSYNCTIMINGS | FB_IGNOREMON, 60,
 912                                        &info->var, info);
 913
 914                        goto gotmode;
 915                }
 916        }
 917
 918        /* Look for a matching VBE mode. */
 919        modeid = uvesafb_vbe_find_mode(par, info->var.xres, info->var.yres,
 920                        info->var.bits_per_pixel, UVESAFB_EXACT_RES);
 921
 922        if (modeid == -1)
 923                return -EINVAL;
 924
 925        uvesafb_setup_var(&info->var, info, &par->vbe_modes[modeid]);
 926
 927gotmode:
 928        /*
 929         * If we are not VBE3.0+ compliant, we're done -- the BIOS will
 930         * ignore our timings anyway.
 931         */
 932        if (par->vbe_ib.vbe_version < 0x0300 || par->nocrtc)
 933                fb_get_mode(FB_VSYNCTIMINGS | FB_IGNOREMON, 60,
 934                                        &info->var, info);
 935
 936        return modeid;
 937}
 938
 939static int uvesafb_setpalette(struct uvesafb_pal_entry *entries, int count,
 940                int start, struct fb_info *info)
 941{
 942        struct uvesafb_ktask *task;
 943#ifdef CONFIG_X86
 944        struct uvesafb_par *par = info->par;
 945        int i = par->mode_idx;
 946#endif
 947        int err = 0;
 948
 949        /*
 950         * We support palette modifications for 8 bpp modes only, so
 951         * there can never be more than 256 entries.
 952         */
 953        if (start + count > 256)
 954                return -EINVAL;
 955
 956#ifdef CONFIG_X86
 957        /* Use VGA registers if mode is VGA-compatible. */
 958        if (i >= 0 && i < par->vbe_modes_cnt &&
 959            par->vbe_modes[i].mode_attr & VBE_MODE_VGACOMPAT) {
 960                for (i = 0; i < count; i++) {
 961                        outb_p(start + i,        dac_reg);
 962                        outb_p(entries[i].red,   dac_val);
 963                        outb_p(entries[i].green, dac_val);
 964                        outb_p(entries[i].blue,  dac_val);
 965                }
 966        }
 967#ifdef CONFIG_X86_32
 968        else if (par->pmi_setpal) {
 969                __asm__ __volatile__(
 970                "call *(%%esi)"
 971                : /* no return value */
 972                : "a" (0x4f09),         /* EAX */
 973                  "b" (0),              /* EBX */
 974                  "c" (count),          /* ECX */
 975                  "d" (start),          /* EDX */
 976                  "D" (entries),        /* EDI */
 977                  "S" (&par->pmi_pal)); /* ESI */
 978        }
 979#endif /* CONFIG_X86_32 */
 980        else
 981#endif /* CONFIG_X86 */
 982        {
 983                task = uvesafb_prep();
 984                if (!task)
 985                        return -ENOMEM;
 986
 987                task->t.regs.eax = 0x4f09;
 988                task->t.regs.ebx = 0x0;
 989                task->t.regs.ecx = count;
 990                task->t.regs.edx = start;
 991                task->t.flags = TF_BUF_ESDI;
 992                task->t.buf_len = sizeof(struct uvesafb_pal_entry) * count;
 993                task->buf = entries;
 994
 995                err = uvesafb_exec(task);
 996                if ((task->t.regs.eax & 0xffff) != 0x004f)
 997                        err = 1;
 998
 999                uvesafb_free(task);
1000        }
1001        return err;
1002}
1003
1004static int uvesafb_setcolreg(unsigned regno, unsigned red, unsigned green,
1005                unsigned blue, unsigned transp,
1006                struct fb_info *info)
1007{
1008        struct uvesafb_pal_entry entry;
1009        int shift = 16 - dac_width;
1010        int err = 0;
1011
1012        if (regno >= info->cmap.len)
1013                return -EINVAL;
1014
1015        if (info->var.bits_per_pixel == 8) {
1016                entry.red   = red   >> shift;
1017                entry.green = green >> shift;
1018                entry.blue  = blue  >> shift;
1019                entry.pad   = 0;
1020
1021                err = uvesafb_setpalette(&entry, 1, regno, info);
1022        } else if (regno < 16) {
1023                switch (info->var.bits_per_pixel) {
1024                case 16:
1025                        if (info->var.red.offset == 10) {
1026                                /* 1:5:5:5 */
1027                                ((u32 *) (info->pseudo_palette))[regno] =
1028                                                ((red   & 0xf800) >>  1) |
1029                                                ((green & 0xf800) >>  6) |
1030                                                ((blue  & 0xf800) >> 11);
1031                        } else {
1032                                /* 0:5:6:5 */
1033                                ((u32 *) (info->pseudo_palette))[regno] =
1034                                                ((red   & 0xf800)      ) |
1035                                                ((green & 0xfc00) >>  5) |
1036                                                ((blue  & 0xf800) >> 11);
1037                        }
1038                        break;
1039
1040                case 24:
1041                case 32:
1042                        red   >>= 8;
1043                        green >>= 8;
1044                        blue  >>= 8;
1045                        ((u32 *)(info->pseudo_palette))[regno] =
1046                                (red   << info->var.red.offset)   |
1047                                (green << info->var.green.offset) |
1048                                (blue  << info->var.blue.offset);
1049                        break;
1050                }
1051        }
1052        return err;
1053}
1054
1055static int uvesafb_setcmap(struct fb_cmap *cmap, struct fb_info *info)
1056{
1057        struct uvesafb_pal_entry *entries;
1058        int shift = 16 - dac_width;
1059        int i, err = 0;
1060
1061        if (info->var.bits_per_pixel == 8) {
1062                if (cmap->start + cmap->len > info->cmap.start +
1063                    info->cmap.len || cmap->start < info->cmap.start)
1064                        return -EINVAL;
1065
1066                entries = kmalloc(sizeof(*entries) * cmap->len, GFP_KERNEL);
1067                if (!entries)
1068                        return -ENOMEM;
1069
1070                for (i = 0; i < cmap->len; i++) {
1071                        entries[i].red   = cmap->red[i]   >> shift;
1072                        entries[i].green = cmap->green[i] >> shift;
1073                        entries[i].blue  = cmap->blue[i]  >> shift;
1074                        entries[i].pad   = 0;
1075                }
1076                err = uvesafb_setpalette(entries, cmap->len, cmap->start, info);
1077                kfree(entries);
1078        } else {
1079                /*
1080                 * For modes with bpp > 8, we only set the pseudo palette in
1081                 * the fb_info struct. We rely on uvesafb_setcolreg to do all
1082                 * sanity checking.
1083                 */
1084                for (i = 0; i < cmap->len; i++) {
1085                        err |= uvesafb_setcolreg(cmap->start + i, cmap->red[i],
1086                                                cmap->green[i], cmap->blue[i],
1087                                                0, info);
1088                }
1089        }
1090        return err;
1091}
1092
1093static int uvesafb_pan_display(struct fb_var_screeninfo *var,
1094                struct fb_info *info)
1095{
1096#ifdef CONFIG_X86_32
1097        int offset;
1098        struct uvesafb_par *par = info->par;
1099
1100        offset = (var->yoffset * info->fix.line_length + var->xoffset) / 4;
1101
1102        /*
1103         * It turns out it's not the best idea to do panning via vm86,
1104         * so we only allow it if we have a PMI.
1105         */
1106        if (par->pmi_start) {
1107                __asm__ __volatile__(
1108                        "call *(%%edi)"
1109                        : /* no return value */
1110                        : "a" (0x4f07),         /* EAX */
1111                          "b" (0),              /* EBX */
1112                          "c" (offset),         /* ECX */
1113                          "d" (offset >> 16),   /* EDX */
1114                          "D" (&par->pmi_start));    /* EDI */
1115        }
1116#endif
1117        return 0;
1118}
1119
1120static int uvesafb_blank(int blank, struct fb_info *info)
1121{
1122        struct uvesafb_ktask *task;
1123        int err = 1;
1124#ifdef CONFIG_X86
1125        struct uvesafb_par *par = info->par;
1126
1127        if (par->vbe_ib.capabilities & VBE_CAP_VGACOMPAT) {
1128                int loop = 10000;
1129                u8 seq = 0, crtc17 = 0;
1130
1131                if (blank == FB_BLANK_POWERDOWN) {
1132                        seq = 0x20;
1133                        crtc17 = 0x00;
1134                        err = 0;
1135                } else {
1136                        seq = 0x00;
1137                        crtc17 = 0x80;
1138                        err = (blank == FB_BLANK_UNBLANK) ? 0 : -EINVAL;
1139                }
1140
1141                vga_wseq(NULL, 0x00, 0x01);
1142                seq |= vga_rseq(NULL, 0x01) & ~0x20;
1143                vga_wseq(NULL, 0x00, seq);
1144
1145                crtc17 |= vga_rcrt(NULL, 0x17) & ~0x80;
1146                while (loop--);
1147                vga_wcrt(NULL, 0x17, crtc17);
1148                vga_wseq(NULL, 0x00, 0x03);
1149        } else
1150#endif /* CONFIG_X86 */
1151        {
1152                task = uvesafb_prep();
1153                if (!task)
1154                        return -ENOMEM;
1155
1156                task->t.regs.eax = 0x4f10;
1157                switch (blank) {
1158                case FB_BLANK_UNBLANK:
1159                        task->t.regs.ebx = 0x0001;
1160                        break;
1161                case FB_BLANK_NORMAL:
1162                        task->t.regs.ebx = 0x0101;      /* standby */
1163                        break;
1164                case FB_BLANK_POWERDOWN:
1165                        task->t.regs.ebx = 0x0401;      /* powerdown */
1166                        break;
1167                default:
1168                        goto out;
1169                }
1170
1171                err = uvesafb_exec(task);
1172                if (err || (task->t.regs.eax & 0xffff) != 0x004f)
1173                        err = 1;
1174out:            uvesafb_free(task);
1175        }
1176        return err;
1177}
1178
1179static int uvesafb_open(struct fb_info *info, int user)
1180{
1181        struct uvesafb_par *par = info->par;
1182        int cnt = atomic_read(&par->ref_count);
1183        u8 *buf = NULL;
1184
1185        if (!cnt && par->vbe_state_size) {
1186                buf =  uvesafb_vbe_state_save(par);
1187                if (IS_ERR(buf)) {
1188                        printk(KERN_WARNING "uvesafb: save hardware state"
1189                                "failed, error code is %ld!\n", PTR_ERR(buf));
1190                } else {
1191                        par->vbe_state_orig = buf;
1192                }
1193        }
1194
1195        atomic_inc(&par->ref_count);
1196        return 0;
1197}
1198
1199static int uvesafb_release(struct fb_info *info, int user)
1200{
1201        struct uvesafb_ktask *task = NULL;
1202        struct uvesafb_par *par = info->par;
1203        int cnt = atomic_read(&par->ref_count);
1204
1205        if (!cnt)
1206                return -EINVAL;
1207
1208        if (cnt != 1)
1209                goto out;
1210
1211        task = uvesafb_prep();
1212        if (!task)
1213                goto out;
1214
1215        /* First, try to set the standard 80x25 text mode. */
1216        task->t.regs.eax = 0x0003;
1217        uvesafb_exec(task);
1218
1219        /*
1220         * Now try to restore whatever hardware state we might have
1221         * saved when the fb device was first opened.
1222         */
1223        uvesafb_vbe_state_restore(par, par->vbe_state_orig);
1224out:
1225        atomic_dec(&par->ref_count);
1226        if (task)
1227                uvesafb_free(task);
1228        return 0;
1229}
1230
1231static int uvesafb_set_par(struct fb_info *info)
1232{
1233        struct uvesafb_par *par = info->par;
1234        struct uvesafb_ktask *task = NULL;
1235        struct vbe_crtc_ib *crtc = NULL;
1236        struct vbe_mode_ib *mode = NULL;
1237        int i, err = 0, depth = info->var.bits_per_pixel;
1238
1239        if (depth > 8 && depth != 32)
1240                depth = info->var.red.length + info->var.green.length +
1241                        info->var.blue.length;
1242
1243        i = uvesafb_vbe_find_mode(par, info->var.xres, info->var.yres, depth,
1244                                 UVESAFB_EXACT_RES | UVESAFB_EXACT_DEPTH);
1245        if (i >= 0)
1246                mode = &par->vbe_modes[i];
1247        else
1248                return -EINVAL;
1249
1250        task = uvesafb_prep();
1251        if (!task)
1252                return -ENOMEM;
1253setmode:
1254        task->t.regs.eax = 0x4f02;
1255        task->t.regs.ebx = mode->mode_id | 0x4000;      /* use LFB */
1256
1257        if (par->vbe_ib.vbe_version >= 0x0300 && !par->nocrtc &&
1258            info->var.pixclock != 0) {
1259                task->t.regs.ebx |= 0x0800;             /* use CRTC data */
1260                task->t.flags = TF_BUF_ESDI;
1261                crtc = kzalloc(sizeof(struct vbe_crtc_ib), GFP_KERNEL);
1262                if (!crtc) {
1263                        err = -ENOMEM;
1264                        goto out;
1265                }
1266                crtc->horiz_start = info->var.xres + info->var.right_margin;
1267                crtc->horiz_end   = crtc->horiz_start + info->var.hsync_len;
1268                crtc->horiz_total = crtc->horiz_end + info->var.left_margin;
1269
1270                crtc->vert_start  = info->var.yres + info->var.lower_margin;
1271                crtc->vert_end    = crtc->vert_start + info->var.vsync_len;
1272                crtc->vert_total  = crtc->vert_end + info->var.upper_margin;
1273
1274                crtc->pixel_clock = PICOS2KHZ(info->var.pixclock) * 1000;
1275                crtc->refresh_rate = (u16)(100 * (crtc->pixel_clock /
1276                                (crtc->vert_total * crtc->horiz_total)));
1277
1278                if (info->var.vmode & FB_VMODE_DOUBLE)
1279                        crtc->flags |= 0x1;
1280                if (info->var.vmode & FB_VMODE_INTERLACED)
1281                        crtc->flags |= 0x2;
1282                if (!(info->var.sync & FB_SYNC_HOR_HIGH_ACT))
1283                        crtc->flags |= 0x4;
1284                if (!(info->var.sync & FB_SYNC_VERT_HIGH_ACT))
1285                        crtc->flags |= 0x8;
1286                memcpy(&par->crtc, crtc, sizeof(*crtc));
1287        } else {
1288                memset(&par->crtc, 0, sizeof(*crtc));
1289        }
1290
1291        task->t.buf_len = sizeof(struct vbe_crtc_ib);
1292        task->buf = &par->crtc;
1293
1294        err = uvesafb_exec(task);
1295        if (err || (task->t.regs.eax & 0xffff) != 0x004f) {
1296                /*
1297                 * The mode switch might have failed because we tried to
1298                 * use our own timings.  Try again with the default timings.
1299                 */
1300                if (crtc != NULL) {
1301                        printk(KERN_WARNING "uvesafb: mode switch failed "
1302                                "(eax=0x%x, err=%d). Trying again with "
1303                                "default timings.\n", task->t.regs.eax, err);
1304                        uvesafb_reset(task);
1305                        kfree(crtc);
1306                        crtc = NULL;
1307                        info->var.pixclock = 0;
1308                        goto setmode;
1309                } else {
1310                        printk(KERN_ERR "uvesafb: mode switch failed (eax="
1311                                "0x%x, err=%d)\n", task->t.regs.eax, err);
1312                        err = -EINVAL;
1313                        goto out;
1314                }
1315        }
1316        par->mode_idx = i;
1317
1318        /* For 8bpp modes, always try to set the DAC to 8 bits. */
1319        if (par->vbe_ib.capabilities & VBE_CAP_CAN_SWITCH_DAC &&
1320            mode->bits_per_pixel <= 8) {
1321                uvesafb_reset(task);
1322                task->t.regs.eax = 0x4f08;
1323                task->t.regs.ebx = 0x0800;
1324
1325                err = uvesafb_exec(task);
1326                if (err || (task->t.regs.eax & 0xffff) != 0x004f ||
1327                    ((task->t.regs.ebx & 0xff00) >> 8) != 8) {
1328                        dac_width = 6;
1329                } else {
1330                        dac_width = 8;
1331                }
1332        }
1333
1334        info->fix.visual = (info->var.bits_per_pixel == 8) ?
1335                                FB_VISUAL_PSEUDOCOLOR : FB_VISUAL_TRUECOLOR;
1336        info->fix.line_length = mode->bytes_per_scan_line;
1337
1338out:    if (crtc != NULL)
1339                kfree(crtc);
1340        uvesafb_free(task);
1341
1342        return err;
1343}
1344
1345static void uvesafb_check_limits(struct fb_var_screeninfo *var,
1346                struct fb_info *info)
1347{
1348        const struct fb_videomode *mode;
1349        struct uvesafb_par *par = info->par;
1350
1351        /*
1352         * If pixclock is set to 0, then we're using default BIOS timings
1353         * and thus don't have to perform any checks here.
1354         */
1355        if (!var->pixclock)
1356                return;
1357
1358        if (par->vbe_ib.vbe_version < 0x0300) {
1359                fb_get_mode(FB_VSYNCTIMINGS | FB_IGNOREMON, 60, var, info);
1360                return;
1361        }
1362
1363        if (!fb_validate_mode(var, info))
1364                return;
1365
1366        mode = fb_find_best_mode(var, &info->modelist);
1367        if (mode) {
1368                if (mode->xres == var->xres && mode->yres == var->yres &&
1369                    !(mode->vmode & (FB_VMODE_INTERLACED | FB_VMODE_DOUBLE))) {
1370                        fb_videomode_to_var(var, mode);
1371                        return;
1372                }
1373        }
1374
1375        if (info->monspecs.gtf && !fb_get_mode(FB_MAXTIMINGS, 0, var, info))
1376                return;
1377        /* Use default refresh rate */
1378        var->pixclock = 0;
1379}
1380
1381static int uvesafb_check_var(struct fb_var_screeninfo *var,
1382                struct fb_info *info)
1383{
1384        struct uvesafb_par *par = info->par;
1385        struct vbe_mode_ib *mode = NULL;
1386        int match = -1;
1387        int depth = var->red.length + var->green.length + var->blue.length;
1388
1389        /*
1390         * Various apps will use bits_per_pixel to set the color depth,
1391         * which is theoretically incorrect, but which we'll try to handle
1392         * here.
1393         */
1394        if (depth == 0 || abs(depth - var->bits_per_pixel) >= 8)
1395                depth = var->bits_per_pixel;
1396
1397        match = uvesafb_vbe_find_mode(par, var->xres, var->yres, depth,
1398                                                UVESAFB_EXACT_RES);
1399        if (match == -1)
1400                return -EINVAL;
1401
1402        mode = &par->vbe_modes[match];
1403        uvesafb_setup_var(var, info, mode);
1404
1405        /*
1406         * Check whether we have remapped enough memory for this mode.
1407         * We might be called at an early stage, when we haven't remapped
1408         * any memory yet, in which case we simply skip the check.
1409         */
1410        if (var->yres * mode->bytes_per_scan_line > info->fix.smem_len
1411                                                && info->fix.smem_len)
1412                return -EINVAL;
1413
1414        if ((var->vmode & FB_VMODE_DOUBLE) &&
1415                                !(par->vbe_modes[match].mode_attr & 0x100))
1416                var->vmode &= ~FB_VMODE_DOUBLE;
1417
1418        if ((var->vmode & FB_VMODE_INTERLACED) &&
1419                                !(par->vbe_modes[match].mode_attr & 0x200))
1420                var->vmode &= ~FB_VMODE_INTERLACED;
1421
1422        uvesafb_check_limits(var, info);
1423
1424        var->xres_virtual = var->xres;
1425        var->yres_virtual = (par->ypan) ?
1426                                info->fix.smem_len / mode->bytes_per_scan_line :
1427                                var->yres;
1428        return 0;
1429}
1430
1431static struct fb_ops uvesafb_ops = {
1432        .owner          = THIS_MODULE,
1433        .fb_open        = uvesafb_open,
1434        .fb_release     = uvesafb_release,
1435        .fb_setcolreg   = uvesafb_setcolreg,
1436        .fb_setcmap     = uvesafb_setcmap,
1437        .fb_pan_display = uvesafb_pan_display,
1438        .fb_blank       = uvesafb_blank,
1439        .fb_fillrect    = cfb_fillrect,
1440        .fb_copyarea    = cfb_copyarea,
1441        .fb_imageblit   = cfb_imageblit,
1442        .fb_check_var   = uvesafb_check_var,
1443        .fb_set_par     = uvesafb_set_par,
1444};
1445
1446static void uvesafb_init_info(struct fb_info *info, struct vbe_mode_ib *mode)
1447{
1448        unsigned int size_vmode;
1449        unsigned int size_remap;
1450        unsigned int size_total;
1451        struct uvesafb_par *par = info->par;
1452        int i, h;
1453
1454        info->pseudo_palette = ((u8 *)info->par + sizeof(struct uvesafb_par));
1455        info->fix = uvesafb_fix;
1456        info->fix.ypanstep = par->ypan ? 1 : 0;
1457        info->fix.ywrapstep = (par->ypan > 1) ? 1 : 0;
1458
1459        /* Disable blanking if the user requested so. */
1460        if (!blank)
1461                info->fbops->fb_blank = NULL;
1462
1463        /*
1464         * Find out how much IO memory is required for the mode with
1465         * the highest resolution.
1466         */
1467        size_remap = 0;
1468        for (i = 0; i < par->vbe_modes_cnt; i++) {
1469                h = par->vbe_modes[i].bytes_per_scan_line *
1470                                        par->vbe_modes[i].y_res;
1471                if (h > size_remap)
1472                        size_remap = h;
1473        }
1474        size_remap *= 2;
1475
1476        /*
1477         *   size_vmode -- that is the amount of memory needed for the
1478         *                 used video mode, i.e. the minimum amount of
1479         *                 memory we need.
1480         */
1481        if (mode != NULL) {
1482                size_vmode = info->var.yres * mode->bytes_per_scan_line;
1483        } else {
1484                size_vmode = info->var.yres * info->var.xres *
1485                             ((info->var.bits_per_pixel + 7) >> 3);
1486        }
1487
1488        /*
1489         *   size_total -- all video memory we have. Used for mtrr
1490         *                 entries, resource allocation and bounds
1491         *                 checking.
1492         */
1493        size_total = par->vbe_ib.total_memory * 65536;
1494        if (vram_total)
1495                size_total = vram_total * 1024 * 1024;
1496        if (size_total < size_vmode)
1497                size_total = size_vmode;
1498
1499        /*
1500         *   size_remap -- the amount of video memory we are going to
1501         *                 use for vesafb.  With modern cards it is no
1502         *                 option to simply use size_total as th
1503         *                 wastes plenty of kernel address space.
1504         */
1505        if (vram_remap)
1506                size_remap = vram_remap * 1024 * 1024;
1507        if (size_remap < size_vmode)
1508                size_remap = size_vmode;
1509        if (size_remap > size_total)
1510                size_remap = size_total;
1511
1512        info->fix.smem_len = size_remap;
1513        info->fix.smem_start = mode->phys_base_ptr;
1514
1515        /*
1516         * We have to set yres_virtual here because when setup_var() was
1517         * called, smem_len wasn't defined yet.
1518         */
1519        info->var.yres_virtual = info->fix.smem_len /
1520                                 mode->bytes_per_scan_line;
1521
1522        if (par->ypan && info->var.yres_virtual > info->var.yres) {
1523                printk(KERN_INFO "uvesafb: scrolling: %s "
1524                        "using protected mode interface, "
1525                        "yres_virtual=%d\n",
1526                        (par->ypan > 1) ? "ywrap" : "ypan",
1527                        info->var.yres_virtual);
1528        } else {
1529                printk(KERN_INFO "uvesafb: scrolling: redraw\n");
1530                info->var.yres_virtual = info->var.yres;
1531                par->ypan = 0;
1532        }
1533
1534        info->flags = FBINFO_FLAG_DEFAULT |
1535                        (par->ypan ? FBINFO_HWACCEL_YPAN : 0);
1536
1537        if (!par->ypan)
1538                info->fbops->fb_pan_display = NULL;
1539}
1540
1541static void uvesafb_init_mtrr(struct fb_info *info)
1542{
1543#ifdef CONFIG_MTRR
1544        if (mtrr && !(info->fix.smem_start & (PAGE_SIZE - 1))) {
1545                int temp_size = info->fix.smem_len;
1546                unsigned int type = 0;
1547
1548                switch (mtrr) {
1549                case 1:
1550                        type = MTRR_TYPE_UNCACHABLE;
1551                        break;
1552                case 2:
1553                        type = MTRR_TYPE_WRBACK;
1554                        break;
1555                case 3:
1556                        type = MTRR_TYPE_WRCOMB;
1557                        break;
1558                case 4:
1559                        type = MTRR_TYPE_WRTHROUGH;
1560                        break;
1561                default:
1562                        type = 0;
1563                        break;
1564                }
1565
1566                if (type) {
1567                        int rc;
1568
1569                        /* Find the largest power-of-two */
1570                        temp_size = roundup_pow_of_two(temp_size);
1571
1572                        /* Try and find a power of two to add */
1573                        do {
1574                                rc = mtrr_add(info->fix.smem_start,
1575                                              temp_size, type, 1);
1576                                temp_size >>= 1;
1577                        } while (temp_size >= PAGE_SIZE && rc == -EINVAL);
1578                }
1579        }
1580#endif /* CONFIG_MTRR */
1581}
1582
1583static void uvesafb_ioremap(struct fb_info *info)
1584{
1585#ifdef CONFIG_X86
1586        switch (mtrr) {
1587        case 1: /* uncachable */
1588                info->screen_base = ioremap_nocache(info->fix.smem_start, info->fix.smem_len);
1589                break;
1590        case 2: /* write-back */
1591                info->screen_base = ioremap_cache(info->fix.smem_start, info->fix.smem_len);
1592                break;
1593        case 3: /* write-combining */
1594                info->screen_base = ioremap_wc(info->fix.smem_start, info->fix.smem_len);
1595                break;
1596        case 4: /* write-through */
1597        default:
1598                info->screen_base = ioremap(info->fix.smem_start, info->fix.smem_len);
1599                break;
1600        }
1601#else
1602        info->screen_base = ioremap(info->fix.smem_start, info->fix.smem_len);
1603#endif /* CONFIG_X86 */
1604}
1605
1606static ssize_t uvesafb_show_vbe_ver(struct device *dev,
1607                struct device_attribute *attr, char *buf)
1608{
1609        struct fb_info *info = platform_get_drvdata(to_platform_device(dev));
1610        struct uvesafb_par *par = info->par;
1611
1612        return snprintf(buf, PAGE_SIZE, "%.4x\n", par->vbe_ib.vbe_version);
1613}
1614
1615static DEVICE_ATTR(vbe_version, S_IRUGO, uvesafb_show_vbe_ver, NULL);
1616
1617static ssize_t uvesafb_show_vbe_modes(struct device *dev,
1618                struct device_attribute *attr, char *buf)
1619{
1620        struct fb_info *info = platform_get_drvdata(to_platform_device(dev));
1621        struct uvesafb_par *par = info->par;
1622        int ret = 0, i;
1623
1624        for (i = 0; i < par->vbe_modes_cnt && ret < PAGE_SIZE; i++) {
1625                ret += snprintf(buf + ret, PAGE_SIZE - ret,
1626                        "%dx%d-%d, 0x%.4x\n",
1627                        par->vbe_modes[i].x_res, par->vbe_modes[i].y_res,
1628                        par->vbe_modes[i].depth, par->vbe_modes[i].mode_id);
1629        }
1630
1631        return ret;
1632}
1633
1634static DEVICE_ATTR(vbe_modes, S_IRUGO, uvesafb_show_vbe_modes, NULL);
1635
1636static ssize_t uvesafb_show_vendor(struct device *dev,
1637                struct device_attribute *attr, char *buf)
1638{
1639        struct fb_info *info = platform_get_drvdata(to_platform_device(dev));
1640        struct uvesafb_par *par = info->par;
1641
1642        if (par->vbe_ib.oem_vendor_name_ptr)
1643                return snprintf(buf, PAGE_SIZE, "%s\n", (char *)
1644                        (&par->vbe_ib) + par->vbe_ib.oem_vendor_name_ptr);
1645        else
1646                return 0;
1647}
1648
1649static DEVICE_ATTR(oem_vendor, S_IRUGO, uvesafb_show_vendor, NULL);
1650
1651static ssize_t uvesafb_show_product_name(struct device *dev,
1652                struct device_attribute *attr, char *buf)
1653{
1654        struct fb_info *info = platform_get_drvdata(to_platform_device(dev));
1655        struct uvesafb_par *par = info->par;
1656
1657        if (par->vbe_ib.oem_product_name_ptr)
1658                return snprintf(buf, PAGE_SIZE, "%s\n", (char *)
1659                        (&par->vbe_ib) + par->vbe_ib.oem_product_name_ptr);
1660        else
1661                return 0;
1662}
1663
1664static DEVICE_ATTR(oem_product_name, S_IRUGO, uvesafb_show_product_name, NULL);
1665
1666static ssize_t uvesafb_show_product_rev(struct device *dev,
1667                struct device_attribute *attr, char *buf)
1668{
1669        struct fb_info *info = platform_get_drvdata(to_platform_device(dev));
1670        struct uvesafb_par *par = info->par;
1671
1672        if (par->vbe_ib.oem_product_rev_ptr)
1673                return snprintf(buf, PAGE_SIZE, "%s\n", (char *)
1674                        (&par->vbe_ib) + par->vbe_ib.oem_product_rev_ptr);
1675        else
1676                return 0;
1677}
1678
1679static DEVICE_ATTR(oem_product_rev, S_IRUGO, uvesafb_show_product_rev, NULL);
1680
1681static ssize_t uvesafb_show_oem_string(struct device *dev,
1682                struct device_attribute *attr, char *buf)
1683{
1684        struct fb_info *info = platform_get_drvdata(to_platform_device(dev));
1685        struct uvesafb_par *par = info->par;
1686
1687        if (par->vbe_ib.oem_string_ptr)
1688                return snprintf(buf, PAGE_SIZE, "%s\n",
1689                        (char *)(&par->vbe_ib) + par->vbe_ib.oem_string_ptr);
1690        else
1691                return 0;
1692}
1693
1694static DEVICE_ATTR(oem_string, S_IRUGO, uvesafb_show_oem_string, NULL);
1695
1696static ssize_t uvesafb_show_nocrtc(struct device *dev,
1697                struct device_attribute *attr, char *buf)
1698{
1699        struct fb_info *info = platform_get_drvdata(to_platform_device(dev));
1700        struct uvesafb_par *par = info->par;
1701
1702        return snprintf(buf, PAGE_SIZE, "%d\n", par->nocrtc);
1703}
1704
1705static ssize_t uvesafb_store_nocrtc(struct device *dev,
1706                struct device_attribute *attr, const char *buf, size_t count)
1707{
1708        struct fb_info *info = platform_get_drvdata(to_platform_device(dev));
1709        struct uvesafb_par *par = info->par;
1710
1711        if (count > 0) {
1712                if (buf[0] == '0')
1713                        par->nocrtc = 0;
1714                else
1715                        par->nocrtc = 1;
1716        }
1717        return count;
1718}
1719
1720static DEVICE_ATTR(nocrtc, S_IRUGO | S_IWUSR, uvesafb_show_nocrtc,
1721                        uvesafb_store_nocrtc);
1722
1723static struct attribute *uvesafb_dev_attrs[] = {
1724        &dev_attr_vbe_version.attr,
1725        &dev_attr_vbe_modes.attr,
1726        &dev_attr_oem_vendor.attr,
1727        &dev_attr_oem_product_name.attr,
1728        &dev_attr_oem_product_rev.attr,
1729        &dev_attr_oem_string.attr,
1730        &dev_attr_nocrtc.attr,
1731        NULL,
1732};
1733
1734static struct attribute_group uvesafb_dev_attgrp = {
1735        .name = NULL,
1736        .attrs = uvesafb_dev_attrs,
1737};
1738
1739static int uvesafb_probe(struct platform_device *dev)
1740{
1741        struct fb_info *info;
1742        struct vbe_mode_ib *mode = NULL;
1743        struct uvesafb_par *par;
1744        int err = 0, i;
1745
1746        info = framebuffer_alloc(sizeof(*par) + sizeof(u32) * 256, &dev->dev);
1747        if (!info)
1748                return -ENOMEM;
1749
1750        par = info->par;
1751
1752        err = uvesafb_vbe_init(info);
1753        if (err) {
1754                printk(KERN_ERR "uvesafb: vbe_init() failed with %d\n", err);
1755                goto out;
1756        }
1757
1758        info->fbops = &uvesafb_ops;
1759
1760        i = uvesafb_vbe_init_mode(info);
1761        if (i < 0) {
1762                err = -EINVAL;
1763                goto out;
1764        } else {
1765                mode = &par->vbe_modes[i];
1766        }
1767
1768        if (fb_alloc_cmap(&info->cmap, 256, 0) < 0) {
1769                err = -ENXIO;
1770                goto out;
1771        }
1772
1773        uvesafb_init_info(info, mode);
1774
1775        if (!request_region(0x3c0, 32, "uvesafb")) {
1776                printk(KERN_ERR "uvesafb: request region 0x3c0-0x3e0 failed\n");
1777                err = -EIO;
1778                goto out_mode;
1779        }
1780
1781        if (!request_mem_region(info->fix.smem_start, info->fix.smem_len,
1782                                "uvesafb")) {
1783                printk(KERN_ERR "uvesafb: cannot reserve video memory at "
1784                                "0x%lx\n", info->fix.smem_start);
1785                err = -EIO;
1786                goto out_reg;
1787        }
1788
1789        uvesafb_init_mtrr(info);
1790        uvesafb_ioremap(info);
1791
1792        if (!info->screen_base) {
1793                printk(KERN_ERR
1794                        "uvesafb: abort, cannot ioremap 0x%x bytes of video "
1795                        "memory at 0x%lx\n",
1796                        info->fix.smem_len, info->fix.smem_start);
1797                err = -EIO;
1798                goto out_mem;
1799        }
1800
1801        platform_set_drvdata(dev, info);
1802
1803        if (register_framebuffer(info) < 0) {
1804                printk(KERN_ERR
1805                        "uvesafb: failed to register framebuffer device\n");
1806                err = -EINVAL;
1807                goto out_unmap;
1808        }
1809
1810        printk(KERN_INFO "uvesafb: framebuffer at 0x%lx, mapped to 0x%p, "
1811                        "using %dk, total %dk\n", info->fix.smem_start,
1812                        info->screen_base, info->fix.smem_len/1024,
1813                        par->vbe_ib.total_memory * 64);
1814        printk(KERN_INFO "fb%d: %s frame buffer device\n", info->node,
1815                        info->fix.id);
1816
1817        err = sysfs_create_group(&dev->dev.kobj, &uvesafb_dev_attgrp);
1818        if (err != 0)
1819                printk(KERN_WARNING "fb%d: failed to register attributes\n",
1820                        info->node);
1821
1822        return 0;
1823
1824out_unmap:
1825        iounmap(info->screen_base);
1826out_mem:
1827        release_mem_region(info->fix.smem_start, info->fix.smem_len);
1828out_reg:
1829        release_region(0x3c0, 32);
1830out_mode:
1831        if (!list_empty(&info->modelist))
1832                fb_destroy_modelist(&info->modelist);
1833        fb_destroy_modedb(info->monspecs.modedb);
1834        fb_dealloc_cmap(&info->cmap);
1835out:
1836        if (par->vbe_modes)
1837                kfree(par->vbe_modes);
1838
1839        framebuffer_release(info);
1840        return err;
1841}
1842
1843static int uvesafb_remove(struct platform_device *dev)
1844{
1845        struct fb_info *info = platform_get_drvdata(dev);
1846
1847        if (info) {
1848                struct uvesafb_par *par = info->par;
1849
1850                sysfs_remove_group(&dev->dev.kobj, &uvesafb_dev_attgrp);
1851                unregister_framebuffer(info);
1852                release_region(0x3c0, 32);
1853                iounmap(info->screen_base);
1854                release_mem_region(info->fix.smem_start, info->fix.smem_len);
1855                fb_destroy_modedb(info->monspecs.modedb);
1856                fb_dealloc_cmap(&info->cmap);
1857
1858                if (par) {
1859                        if (par->vbe_modes)
1860                                kfree(par->vbe_modes);
1861                        if (par->vbe_state_orig)
1862                                kfree(par->vbe_state_orig);
1863                        if (par->vbe_state_saved)
1864                                kfree(par->vbe_state_saved);
1865                }
1866
1867                framebuffer_release(info);
1868        }
1869        return 0;
1870}
1871
1872static struct platform_driver uvesafb_driver = {
1873        .probe  = uvesafb_probe,
1874        .remove = uvesafb_remove,
1875        .driver = {
1876                .name = "uvesafb",
1877        },
1878};
1879
1880static struct platform_device *uvesafb_device;
1881
1882#ifndef MODULE
1883static int uvesafb_setup(char *options)
1884{
1885        char *this_opt;
1886
1887        if (!options || !*options)
1888                return 0;
1889
1890        while ((this_opt = strsep(&options, ",")) != NULL) {
1891                if (!*this_opt) continue;
1892
1893                if (!strcmp(this_opt, "redraw"))
1894                        ypan = 0;
1895                else if (!strcmp(this_opt, "ypan"))
1896                        ypan = 1;
1897                else if (!strcmp(this_opt, "ywrap"))
1898                        ypan = 2;
1899                else if (!strcmp(this_opt, "vgapal"))
1900                        pmi_setpal = 0;
1901                else if (!strcmp(this_opt, "pmipal"))
1902                        pmi_setpal = 1;
1903                else if (!strncmp(this_opt, "mtrr:", 5))
1904                        mtrr = simple_strtoul(this_opt+5, NULL, 0);
1905                else if (!strcmp(this_opt, "nomtrr"))
1906                        mtrr = 0;
1907                else if (!strcmp(this_opt, "nocrtc"))
1908                        nocrtc = 1;
1909                else if (!strcmp(this_opt, "noedid"))
1910                        noedid = 1;
1911                else if (!strcmp(this_opt, "noblank"))
1912                        blank = 0;
1913                else if (!strncmp(this_opt, "vtotal:", 7))
1914                        vram_total = simple_strtoul(this_opt + 7, NULL, 0);
1915                else if (!strncmp(this_opt, "vremap:", 7))
1916                        vram_remap = simple_strtoul(this_opt + 7, NULL, 0);
1917                else if (!strncmp(this_opt, "maxhf:", 6))
1918                        maxhf = simple_strtoul(this_opt + 6, NULL, 0);
1919                else if (!strncmp(this_opt, "maxvf:", 6))
1920                        maxvf = simple_strtoul(this_opt + 6, NULL, 0);
1921                else if (!strncmp(this_opt, "maxclk:", 7))
1922                        maxclk = simple_strtoul(this_opt + 7, NULL, 0);
1923                else if (!strncmp(this_opt, "vbemode:", 8))
1924                        vbemode = simple_strtoul(this_opt + 8, NULL, 0);
1925                else if (this_opt[0] >= '0' && this_opt[0] <= '9') {
1926                        mode_option = this_opt;
1927                } else {
1928                        printk(KERN_WARNING
1929                                "uvesafb: unrecognized option %s\n", this_opt);
1930                }
1931        }
1932
1933        return 0;
1934}
1935#endif /* !MODULE */
1936
1937static ssize_t show_v86d(struct device_driver *dev, char *buf)
1938{
1939        return snprintf(buf, PAGE_SIZE, "%s\n", v86d_path);
1940}
1941
1942static ssize_t store_v86d(struct device_driver *dev, const char *buf,
1943                size_t count)
1944{
1945        strncpy(v86d_path, buf, PATH_MAX);
1946        return count;
1947}
1948
1949static DRIVER_ATTR(v86d, S_IRUGO | S_IWUSR, show_v86d, store_v86d);
1950
1951static int uvesafb_init(void)
1952{
1953        int err;
1954
1955#ifndef MODULE
1956        char *option = NULL;
1957
1958        if (fb_get_options("uvesafb", &option))
1959                return -ENODEV;
1960        uvesafb_setup(option);
1961#endif
1962        err = cn_add_callback(&uvesafb_cn_id, "uvesafb", uvesafb_cn_callback);
1963        if (err)
1964                return err;
1965
1966        err = platform_driver_register(&uvesafb_driver);
1967
1968        if (!err) {
1969                uvesafb_device = platform_device_alloc("uvesafb", 0);
1970                if (uvesafb_device)
1971                        err = platform_device_add(uvesafb_device);
1972                else
1973                        err = -ENOMEM;
1974
1975                if (err) {
1976                        platform_device_put(uvesafb_device);
1977                        platform_driver_unregister(&uvesafb_driver);
1978                        cn_del_callback(&uvesafb_cn_id);
1979                        return err;
1980                }
1981
1982                err = driver_create_file(&uvesafb_driver.driver,
1983                                &driver_attr_v86d);
1984                if (err) {
1985                        printk(KERN_WARNING "uvesafb: failed to register "
1986                                        "attributes\n");
1987                        err = 0;
1988                }
1989        }
1990        return err;
1991}
1992
1993module_init(uvesafb_init);
1994
1995static void uvesafb_exit(void)
1996{
1997        struct uvesafb_ktask *task;
1998
1999        if (v86d_started) {
2000                task = uvesafb_prep();
2001                if (task) {
2002                        task->t.flags = TF_EXIT;
2003                        uvesafb_exec(task);
2004                        uvesafb_free(task);
2005                }
2006        }
2007
2008        cn_del_callback(&uvesafb_cn_id);
2009        driver_remove_file(&uvesafb_driver.driver, &driver_attr_v86d);
2010        platform_device_unregister(uvesafb_device);
2011        platform_driver_unregister(&uvesafb_driver);
2012}
2013
2014module_exit(uvesafb_exit);
2015
2016static int param_set_scroll(const char *val, const struct kernel_param *kp)
2017{
2018        ypan = 0;
2019
2020        if (!strcmp(val, "redraw"))
2021                ypan = 0;
2022        else if (!strcmp(val, "ypan"))
2023                ypan = 1;
2024        else if (!strcmp(val, "ywrap"))
2025                ypan = 2;
2026        else
2027                return -EINVAL;
2028
2029        return 0;
2030}
2031static struct kernel_param_ops param_ops_scroll = {
2032        .set = param_set_scroll,
2033};
2034#define param_check_scroll(name, p) __param_check(name, p, void)
2035
2036module_param_named(scroll, ypan, scroll, 0);
2037MODULE_PARM_DESC(scroll,
2038        "Scrolling mode, set to 'redraw', 'ypan', or 'ywrap'");
2039module_param_named(vgapal, pmi_setpal, invbool, 0);
2040MODULE_PARM_DESC(vgapal, "Set palette using VGA registers");
2041module_param_named(pmipal, pmi_setpal, bool, 0);
2042MODULE_PARM_DESC(pmipal, "Set palette using PMI calls");
2043module_param(mtrr, uint, 0);
2044MODULE_PARM_DESC(mtrr,
2045        "Memory Type Range Registers setting. Use 0 to disable.");
2046module_param(blank, bool, 0);
2047MODULE_PARM_DESC(blank, "Enable hardware blanking");
2048module_param(nocrtc, bool, 0);
2049MODULE_PARM_DESC(nocrtc, "Ignore CRTC timings when setting modes");
2050module_param(noedid, bool, 0);
2051MODULE_PARM_DESC(noedid,
2052        "Ignore EDID-provided monitor limits when setting modes");
2053module_param(vram_remap, uint, 0);
2054MODULE_PARM_DESC(vram_remap, "Set amount of video memory to be used [MiB]");
2055module_param(vram_total, uint, 0);
2056MODULE_PARM_DESC(vram_total, "Set total amount of video memoery [MiB]");
2057module_param(maxclk, ushort, 0);
2058MODULE_PARM_DESC(maxclk, "Maximum pixelclock [MHz], overrides EDID data");
2059module_param(maxhf, ushort, 0);
2060MODULE_PARM_DESC(maxhf,
2061        "Maximum horizontal frequency [kHz], overrides EDID data");
2062module_param(maxvf, ushort, 0);
2063MODULE_PARM_DESC(maxvf,
2064        "Maximum vertical frequency [Hz], overrides EDID data");
2065module_param(mode_option, charp, 0);
2066MODULE_PARM_DESC(mode_option,
2067        "Specify initial video mode as \"<xres>x<yres>[-<bpp>][@<refresh>]\"");
2068module_param(vbemode, ushort, 0);
2069MODULE_PARM_DESC(vbemode,
2070        "VBE mode number to set, overrides the 'mode' option");
2071module_param_string(v86d, v86d_path, PATH_MAX, 0660);
2072MODULE_PARM_DESC(v86d, "Path to the v86d userspace helper.");
2073
2074MODULE_LICENSE("GPL");
2075MODULE_AUTHOR("Michal Januszewski <spock@gentoo.org>");
2076MODULE_DESCRIPTION("Framebuffer driver for VBE2.0+ compliant graphics boards");
2077
2078
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