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uvesafb.c

/*
 * A framebuffer driver for VBE 2.0+ compliant video cards
 *
 * (c) 2007 Michal Januszewski <spock@gentoo.org>
 *     Loosely based upon the vesafb driver.
 *
 */
#include <linux/init.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/skbuff.h>
#include <linux/timer.h>
#include <linux/completion.h>
#include <linux/connector.h>
#include <linux/random.h>
#include <linux/platform_device.h>
#include <linux/limits.h>
#include <linux/fb.h>
#include <linux/io.h>
#include <linux/mutex.h>
#include <video/edid.h>
#include <video/uvesafb.h>
#ifdef CONFIG_X86
#include <video/vga.h>
#endif
#ifdef CONFIG_MTRR
#include <asm/mtrr.h>
#endif
#include "edid.h"

static struct cb_id uvesafb_cn_id = {
      .idx = CN_IDX_V86D,
      .val = CN_VAL_V86D_UVESAFB
};
static char v86d_path[PATH_MAX] = "/sbin/v86d";
static char v86d_started;     /* has v86d been started by uvesafb? */

static struct fb_fix_screeninfo uvesafb_fix __devinitdata = {
      .id   = "VESA VGA",
      .type = FB_TYPE_PACKED_PIXELS,
      .accel      = FB_ACCEL_NONE,
      .visual = FB_VISUAL_TRUECOLOR,
};

static int mtrr         __devinitdata = 3; /* enable mtrr by default */
static int blank  = 1;           /* enable blanking by default */
static int ypan         __devinitdata = 1; /* 0: scroll, 1: ypan, 2: ywrap */
static int pmi_setpal   __devinitdata = 1; /* use PMI for palette changes */
static int nocrtc __devinitdata; /* ignore CRTC settings */
static int noedid __devinitdata; /* don't try DDC transfers */
static int vram_remap   __devinitdata; /* set amt. of memory to be used */
static int vram_total   __devinitdata; /* set total amount of memory */
static u16 maxclk __devinitdata; /* maximum pixel clock */
static u16 maxvf  __devinitdata; /* maximum vertical frequency */
static u16 maxhf  __devinitdata; /* maximum horizontal frequency */
static u16 vbemode      __devinitdata; /* force use of a specific VBE mode */
static char *mode_option __devinitdata;

static struct uvesafb_ktask *uvfb_tasks[UVESAFB_TASKS_MAX];
static DEFINE_MUTEX(uvfb_lock);

/*
 * A handler for replies from userspace.
 *
 * Make sure each message passes consistency checks and if it does,
 * find the kernel part of the task struct, copy the registers and
 * the buffer contents and then complete the task.
 */
static void uvesafb_cn_callback(void *data)
{
      struct cn_msg *msg = data;
      struct uvesafb_task *utask;
      struct uvesafb_ktask *task;

      if (msg->seq >= UVESAFB_TASKS_MAX)
            return;

      mutex_lock(&uvfb_lock);
      task = uvfb_tasks[msg->seq];

      if (!task || msg->ack != task->ack) {
            mutex_unlock(&uvfb_lock);
            return;
      }

      utask = (struct uvesafb_task *)msg->data;

      /* Sanity checks for the buffer length. */
      if (task->t.buf_len < utask->buf_len ||
          utask->buf_len > msg->len - sizeof(*utask)) {
            mutex_unlock(&uvfb_lock);
            return;
      }

      uvfb_tasks[msg->seq] = NULL;
      mutex_unlock(&uvfb_lock);

      memcpy(&task->t, utask, sizeof(*utask));

      if (task->t.buf_len && task->buf)
            memcpy(task->buf, utask + 1, task->t.buf_len);

      complete(task->done);
      return;
}

static int uvesafb_helper_start(void)
{
      char *envp[] = {
            "HOME=/",
            "PATH=/sbin:/bin",
            NULL,
      };

      char *argv[] = {
            v86d_path,
            NULL,
      };

      return call_usermodehelper(v86d_path, argv, envp, 1);
}

/*
 * Execute a uvesafb task.
 *
 * Returns 0 if the task is executed successfully.
 *
 * A message sent to the userspace consists of the uvesafb_task
 * struct and (optionally) a buffer. The uvesafb_task struct is
 * a simplified version of uvesafb_ktask (its kernel counterpart)
 * containing only the register values, flags and the length of
 * the buffer.
 *
 * Each message is assigned a sequence number (increased linearly)
 * and a random ack number. The sequence number is used as a key
 * for the uvfb_tasks array which holds pointers to uvesafb_ktask
 * structs for all requests.
 */
static int uvesafb_exec(struct uvesafb_ktask *task)
{
      static int seq;
      struct cn_msg *m;
      int err;
      int len = sizeof(task->t) + task->t.buf_len;

      /*
       * Check whether the message isn't longer than the maximum
       * allowed by connector.
       */
      if (sizeof(*m) + len > CONNECTOR_MAX_MSG_SIZE) {
            printk(KERN_WARNING "uvesafb: message too long (%d), "
                  "can't execute task\n", (int)(sizeof(*m) + len));
            return -E2BIG;
      }

      m = kzalloc(sizeof(*m) + len, GFP_KERNEL);
      if (!m)
            return -ENOMEM;

      init_completion(task->done);

      memcpy(&m->id, &uvesafb_cn_id, sizeof(m->id));
      m->seq = seq;
      m->len = len;
      m->ack = random32();

      /* uvesafb_task structure */
      memcpy(m + 1, &task->t, sizeof(task->t));

      /* Buffer */
      memcpy((u8 *)(m + 1) + sizeof(task->t), task->buf, task->t.buf_len);

      /*
       * Save the message ack number so that we can find the kernel
       * part of this task when a reply is received from userspace.
       */
      task->ack = m->ack;

      mutex_lock(&uvfb_lock);

      /* If all slots are taken -- bail out. */
      if (uvfb_tasks[seq]) {
            mutex_unlock(&uvfb_lock);
            return -EBUSY;
      }

      /* Save a pointer to the kernel part of the task struct. */
      uvfb_tasks[seq] = task;
      mutex_unlock(&uvfb_lock);

      err = cn_netlink_send(m, 0, gfp_any());
      if (err == -ESRCH) {
            /*
             * Try to start the userspace helper if sending
             * the request failed the first time.
             */
            err = uvesafb_helper_start();
            if (err) {
                  printk(KERN_ERR "uvesafb: failed to execute %s\n",
                              v86d_path);
                  printk(KERN_ERR "uvesafb: make sure that the v86d "
                              "helper is installed and executable\n");
            } else {
                  v86d_started = 1;
                  err = cn_netlink_send(m, 0, gfp_any());
            }
      }
      kfree(m);

      if (!err && !(task->t.flags & TF_EXIT))
            err = !wait_for_completion_timeout(task->done,
                        msecs_to_jiffies(UVESAFB_TIMEOUT));

      mutex_lock(&uvfb_lock);
      uvfb_tasks[seq] = NULL;
      mutex_unlock(&uvfb_lock);

      seq++;
      if (seq >= UVESAFB_TASKS_MAX)
            seq = 0;

      return err;
}

/*
 * Free a uvesafb_ktask struct.
 */
static void uvesafb_free(struct uvesafb_ktask *task)
{
      if (task) {
            if (task->done)
                  kfree(task->done);
            kfree(task);
      }
}

/*
 * Prepare a uvesafb_ktask struct to be used again.
 */
static void uvesafb_reset(struct uvesafb_ktask *task)
{
      struct completion *cpl = task->done;

      memset(task, 0, sizeof(*task));
      task->done = cpl;
}

/*
 * Allocate and prepare a uvesafb_ktask struct.
 */
static struct uvesafb_ktask *uvesafb_prep(void)
{
      struct uvesafb_ktask *task;

      task = kzalloc(sizeof(*task), GFP_KERNEL);
      if (task) {
            task->done = kzalloc(sizeof(*task->done), GFP_KERNEL);
            if (!task->done) {
                  kfree(task);
                  task = NULL;
            }
      }
      return task;
}

static void uvesafb_setup_var(struct fb_var_screeninfo *var,
            struct fb_info *info, struct vbe_mode_ib *mode)
{
      struct uvesafb_par *par = info->par;

      var->vmode = FB_VMODE_NONINTERLACED;
      var->sync = FB_SYNC_VERT_HIGH_ACT;

      var->xres = mode->x_res;
      var->yres = mode->y_res;
      var->xres_virtual = mode->x_res;
      var->yres_virtual = (par->ypan) ?
                  info->fix.smem_len / mode->bytes_per_scan_line :
                  mode->y_res;
      var->xoffset = 0;
      var->yoffset = 0;
      var->bits_per_pixel = mode->bits_per_pixel;

      if (var->bits_per_pixel == 15)
            var->bits_per_pixel = 16;

      if (var->bits_per_pixel > 8) {
            var->red.offset    = mode->red_off;
            var->red.length    = mode->red_len;
            var->green.offset  = mode->green_off;
            var->green.length  = mode->green_len;
            var->blue.offset   = mode->blue_off;
            var->blue.length   = mode->blue_len;
            var->transp.offset = mode->rsvd_off;
            var->transp.length = mode->rsvd_len;
      } else {
            var->red.offset    = 0;
            var->green.offset  = 0;
            var->blue.offset   = 0;
            var->transp.offset = 0;

            /*
             * We're assuming that we can switch the DAC to 8 bits. If
             * this proves to be incorrect, we'll update the fields
             * later in set_par().
             */
            if (par->vbe_ib.capabilities & VBE_CAP_CAN_SWITCH_DAC) {
                  var->red.length    = 8;
                  var->green.length  = 8;
                  var->blue.length   = 8;
                  var->transp.length = 0;
            } else {
                  var->red.length    = 6;
                  var->green.length  = 6;
                  var->blue.length   = 6;
                  var->transp.length = 0;
            }
      }
}

static int uvesafb_vbe_find_mode(struct uvesafb_par *par,
            int xres, int yres, int depth, unsigned char flags)
{
      int i, match = -1, h = 0, d = 0x7fffffff;

      for (i = 0; i < par->vbe_modes_cnt; i++) {
            h = abs(par->vbe_modes[i].x_res - xres) +
                abs(par->vbe_modes[i].y_res - yres) +
                abs(depth - par->vbe_modes[i].depth);

            /*
             * We have an exact match in terms of resolution
             * and depth.
             */
            if (h == 0)
                  return i;

            if (h < d || (h == d && par->vbe_modes[i].depth > depth)) {
                  d = h;
                  match = i;
            }
      }
      i = 1;

      if (flags & UVESAFB_EXACT_DEPTH &&
                  par->vbe_modes[match].depth != depth)
            i = 0;

      if (flags & UVESAFB_EXACT_RES && d > 24)
            i = 0;

      if (i != 0)
            return match;
      else
            return -1;
}

static u8 *uvesafb_vbe_state_save(struct uvesafb_par *par)
{
      struct uvesafb_ktask *task;
      u8 *state;
      int err;

      if (!par->vbe_state_size)
            return NULL;

      state = kmalloc(par->vbe_state_size, GFP_KERNEL);
      if (!state)
            return NULL;

      task = uvesafb_prep();
      if (!task) {
            kfree(state);
            return NULL;
      }

      task->t.regs.eax = 0x4f04;
      task->t.regs.ecx = 0x000f;
      task->t.regs.edx = 0x0001;
      task->t.flags = TF_BUF_RET | TF_BUF_ESBX;
      task->t.buf_len = par->vbe_state_size;
      task->buf = state;
      err = uvesafb_exec(task);

      if (err || (task->t.regs.eax & 0xffff) != 0x004f) {
            printk(KERN_WARNING "uvesafb: VBE get state call "
                        "failed (eax=0x%x, err=%d)\n",
                        task->t.regs.eax, err);
            kfree(state);
            state = NULL;
      }

      uvesafb_free(task);
      return state;
}

static void uvesafb_vbe_state_restore(struct uvesafb_par *par, u8 *state_buf)
{
      struct uvesafb_ktask *task;
      int err;

      if (!state_buf)
            return;

      task = uvesafb_prep();
      if (!task)
            return;

      task->t.regs.eax = 0x4f04;
      task->t.regs.ecx = 0x000f;
      task->t.regs.edx = 0x0002;
      task->t.buf_len = par->vbe_state_size;
      task->t.flags = TF_BUF_ESBX;
      task->buf = state_buf;

      err = uvesafb_exec(task);
      if (err || (task->t.regs.eax & 0xffff) != 0x004f)
            printk(KERN_WARNING "uvesafb: VBE state restore call "
                        "failed (eax=0x%x, err=%d)\n",
                        task->t.regs.eax, err);

      uvesafb_free(task);
}

static int __devinit uvesafb_vbe_getinfo(struct uvesafb_ktask *task,
            struct uvesafb_par *par)
{
      int err;

      task->t.regs.eax = 0x4f00;
      task->t.flags = TF_VBEIB;
      task->t.buf_len = sizeof(struct vbe_ib);
      task->buf = &par->vbe_ib;
      strncpy(par->vbe_ib.vbe_signature, "VBE2", 4);

      err = uvesafb_exec(task);
      if (err || (task->t.regs.eax & 0xffff) != 0x004f) {
            printk(KERN_ERR "uvesafb: Getting VBE info block failed "
                        "(eax=0x%x, err=%d)\n", (u32)task->t.regs.eax,
                        err);
            return -EINVAL;
      }

      if (par->vbe_ib.vbe_version < 0x0200) {
            printk(KERN_ERR "uvesafb: Sorry, pre-VBE 2.0 cards are "
                        "not supported.\n");
            return -EINVAL;
      }

      if (!par->vbe_ib.mode_list_ptr) {
            printk(KERN_ERR "uvesafb: Missing mode list!\n");
            return -EINVAL;
      }

      printk(KERN_INFO "uvesafb: ");

      /*
       * Convert string pointers and the mode list pointer into
       * usable addresses. Print informational messages about the
       * video adapter and its vendor.
       */
      if (par->vbe_ib.oem_vendor_name_ptr)
            printk("%s, ",
                  ((char *)task->buf) + par->vbe_ib.oem_vendor_name_ptr);

      if (par->vbe_ib.oem_product_name_ptr)
            printk("%s, ",
                  ((char *)task->buf) + par->vbe_ib.oem_product_name_ptr);

      if (par->vbe_ib.oem_product_rev_ptr)
            printk("%s, ",
                  ((char *)task->buf) + par->vbe_ib.oem_product_rev_ptr);

      if (par->vbe_ib.oem_string_ptr)
            printk("OEM: %s, ",
                  ((char *)task->buf) + par->vbe_ib.oem_string_ptr);

      printk("VBE v%d.%d\n", ((par->vbe_ib.vbe_version & 0xff00) >> 8),
                  par->vbe_ib.vbe_version & 0xff);

      return 0;
}

static int __devinit uvesafb_vbe_getmodes(struct uvesafb_ktask *task,
            struct uvesafb_par *par)
{
      int off = 0, err;
      u16 *mode;

      par->vbe_modes_cnt = 0;

      /* Count available modes. */
      mode = (u16 *) (((u8 *)&par->vbe_ib) + par->vbe_ib.mode_list_ptr);
      while (*mode != 0xffff) {
            par->vbe_modes_cnt++;
            mode++;
      }

      par->vbe_modes = kzalloc(sizeof(struct vbe_mode_ib) *
                        par->vbe_modes_cnt, GFP_KERNEL);
      if (!par->vbe_modes)
            return -ENOMEM;

      /* Get info about all available modes. */
      mode = (u16 *) (((u8 *)&par->vbe_ib) + par->vbe_ib.mode_list_ptr);
      while (*mode != 0xffff) {
            struct vbe_mode_ib *mib;

            uvesafb_reset(task);
            task->t.regs.eax = 0x4f01;
            task->t.regs.ecx = (u32) *mode;
            task->t.flags = TF_BUF_RET | TF_BUF_ESDI;
            task->t.buf_len = sizeof(struct vbe_mode_ib);
            task->buf = par->vbe_modes + off;

            err = uvesafb_exec(task);
            if (err || (task->t.regs.eax & 0xffff) != 0x004f) {
                  printk(KERN_ERR "uvesafb: Getting mode info block "
                        "for mode 0x%x failed (eax=0x%x, err=%d)\n",
                        *mode, (u32)task->t.regs.eax, err);
                  return -EINVAL;
            }

            mib = task->buf;
            mib->mode_id = *mode;

            /*
             * We only want modes that are supported with the current
             * hardware configuration, color, graphics and that have
             * support for the LFB.
             */
            if ((mib->mode_attr & VBE_MODE_MASK) == VBE_MODE_MASK &&
                         mib->bits_per_pixel >= 8)
                  off++;
            else
                  par->vbe_modes_cnt--;

            mode++;
            mib->depth = mib->red_len + mib->green_len + mib->blue_len;

            /*
             * Handle 8bpp modes and modes with broken color component
             * lengths.
             */
            if (mib->depth == 0 || (mib->depth == 24 &&
                              mib->bits_per_pixel == 32))
                  mib->depth = mib->bits_per_pixel;
      }

      return 0;
}

/*
 * The Protected Mode Interface is 32-bit x86 code, so we only run it on
 * x86 and not x86_64.
 */
#ifdef CONFIG_X86_32
static int __devinit uvesafb_vbe_getpmi(struct uvesafb_ktask *task,
            struct uvesafb_par *par)
{
      int i, err;

      uvesafb_reset(task);
      task->t.regs.eax = 0x4f0a;
      task->t.regs.ebx = 0x0;
      err = uvesafb_exec(task);

      if ((task->t.regs.eax & 0xffff) != 0x4f || task->t.regs.es < 0xc000) {
            par->pmi_setpal = par->ypan = 0;
      } else {
            par->pmi_base = (u16 *)phys_to_virt(((u32)task->t.regs.es << 4)
                                    + task->t.regs.edi);
            par->pmi_start = (u8 *)par->pmi_base + par->pmi_base[1];
            par->pmi_pal = (u8 *)par->pmi_base + par->pmi_base[2];
            printk(KERN_INFO "uvesafb: protected mode interface info at "
                         "%04x:%04x\n",
                         (u16)task->t.regs.es, (u16)task->t.regs.edi);
            printk(KERN_INFO "uvesafb: pmi: set display start = %p, "
                         "set palette = %p\n", par->pmi_start,
                         par->pmi_pal);

            if (par->pmi_base[3]) {
                  printk(KERN_INFO "uvesafb: pmi: ports = ");
                  for (i = par->pmi_base[3]/2;
                              par->pmi_base[i] != 0xffff; i++)
                        printk("%x ", par->pmi_base[i]);
                  printk("\n");

                  if (par->pmi_base[i] != 0xffff) {
                        printk(KERN_INFO "uvesafb: can't handle memory"
                                     " requests, pmi disabled\n");
                        par->ypan = par->pmi_setpal = 0;
                  }
            }
      }
      return 0;
}
#endif /* CONFIG_X86_32 */

/*
 * Check whether a video mode is supported by the Video BIOS and is
 * compatible with the monitor limits.
 */
static int __devinit uvesafb_is_valid_mode(struct fb_videomode *mode,
            struct fb_info *info)
{
      if (info->monspecs.gtf) {
            fb_videomode_to_var(&info->var, mode);
            if (fb_validate_mode(&info->var, info))
                  return 0;
      }

      if (uvesafb_vbe_find_mode(info->par, mode->xres, mode->yres, 8,
                        UVESAFB_EXACT_RES) == -1)
            return 0;

      return 1;
}

static int __devinit uvesafb_vbe_getedid(struct uvesafb_ktask *task,
            struct fb_info *info)
{
      struct uvesafb_par *par = info->par;
      int err = 0;

      if (noedid || par->vbe_ib.vbe_version < 0x0300)
            return -EINVAL;

      task->t.regs.eax = 0x4f15;
      task->t.regs.ebx = 0;
      task->t.regs.ecx = 0;
      task->t.buf_len = 0;
      task->t.flags = 0;

      err = uvesafb_exec(task);

      if ((task->t.regs.eax & 0xffff) != 0x004f || err)
            return -EINVAL;

      if ((task->t.regs.ebx & 0x3) == 3) {
            printk(KERN_INFO "uvesafb: VBIOS/hardware supports both "
                         "DDC1 and DDC2 transfers\n");
      } else if ((task->t.regs.ebx & 0x3) == 2) {
            printk(KERN_INFO "uvesafb: VBIOS/hardware supports DDC2 "
                         "transfers\n");
      } else if ((task->t.regs.ebx & 0x3) == 1) {
            printk(KERN_INFO "uvesafb: VBIOS/hardware supports DDC1 "
                         "transfers\n");
      } else {
            printk(KERN_INFO "uvesafb: VBIOS/hardware doesn't support "
                         "DDC transfers\n");
            return -EINVAL;
      }

      task->t.regs.eax = 0x4f15;
      task->t.regs.ebx = 1;
      task->t.regs.ecx = task->t.regs.edx = 0;
      task->t.flags = TF_BUF_RET | TF_BUF_ESDI;
      task->t.buf_len = EDID_LENGTH;
      task->buf = kzalloc(EDID_LENGTH, GFP_KERNEL);

      err = uvesafb_exec(task);

      if ((task->t.regs.eax & 0xffff) == 0x004f && !err) {
            fb_edid_to_monspecs(task->buf, &info->monspecs);

            if (info->monspecs.vfmax && info->monspecs.hfmax) {
                  /*
                   * If the maximum pixel clock wasn't specified in
                   * the EDID block, set it to 300 MHz.
                   */
                  if (info->monspecs.dclkmax == 0)
                        info->monspecs.dclkmax = 300 * 1000000;
                  info->monspecs.gtf = 1;
            }
      } else {
            err = -EINVAL;
      }

      kfree(task->buf);
      return err;
}

static void __devinit uvesafb_vbe_getmonspecs(struct uvesafb_ktask *task,
            struct fb_info *info)
{
      struct uvesafb_par *par = info->par;
      int i;

      memset(&info->monspecs, 0, sizeof(info->monspecs));

      /*
       * If we don't get all necessary data from the EDID block,
       * mark it as incompatible with the GTF and set nocrtc so
       * that we always use the default BIOS refresh rate.
       */
      if (uvesafb_vbe_getedid(task, info)) {
            info->monspecs.gtf = 0;
            par->nocrtc = 1;
      }

      /* Kernel command line overrides. */
      if (maxclk)
            info->monspecs.dclkmax = maxclk * 1000000;
      if (maxvf)
            info->monspecs.vfmax = maxvf;
      if (maxhf)
            info->monspecs.hfmax = maxhf * 1000;

      /*
       * In case DDC transfers are not supported, the user can provide
       * monitor limits manually. Lower limits are set to "safe" values.
       */
      if (info->monspecs.gtf == 0 && maxclk && maxvf && maxhf) {
            info->monspecs.dclkmin = 0;
            info->monspecs.vfmin = 60;
            info->monspecs.hfmin = 29000;
            info->monspecs.gtf = 1;
            par->nocrtc = 0;
      }

      if (info->monspecs.gtf)
            printk(KERN_INFO
                  "uvesafb: monitor limits: vf = %d Hz, hf = %d kHz, "
                  "clk = %d MHz\n", info->monspecs.vfmax,
                  (int)(info->monspecs.hfmax / 1000),
                  (int)(info->monspecs.dclkmax / 1000000));
      else
            printk(KERN_INFO "uvesafb: no monitor limits have been set, "
                         "default refresh rate will be used\n");

      /* Add VBE modes to the modelist. */
      for (i = 0; i < par->vbe_modes_cnt; i++) {
            struct fb_var_screeninfo var;
            struct vbe_mode_ib *mode;
            struct fb_videomode vmode;

            mode = &par->vbe_modes[i];
            memset(&var, 0, sizeof(var));

            var.xres = mode->x_res;
            var.yres = mode->y_res;

            fb_get_mode(FB_VSYNCTIMINGS | FB_IGNOREMON, 60, &var, info);
            fb_var_to_videomode(&vmode, &var);
            fb_add_videomode(&vmode, &info->modelist);
      }

      /* Add valid VESA modes to our modelist. */
      for (i = 0; i < VESA_MODEDB_SIZE; i++) {
            if (uvesafb_is_valid_mode((struct fb_videomode *)
                                    &vesa_modes[i], info))
                  fb_add_videomode(&vesa_modes[i], &info->modelist);
      }

      for (i = 0; i < info->monspecs.modedb_len; i++) {
            if (uvesafb_is_valid_mode(&info->monspecs.modedb[i], info))
                  fb_add_videomode(&info->monspecs.modedb[i],
                              &info->modelist);
      }

      return;
}

static void __devinit uvesafb_vbe_getstatesize(struct uvesafb_ktask *task,
            struct uvesafb_par *par)
{
      int err;

      uvesafb_reset(task);

      /*
       * Get the VBE state buffer size. We want all available
       * hardware state data (CL = 0x0f).
       */
      task->t.regs.eax = 0x4f04;
      task->t.regs.ecx = 0x000f;
      task->t.regs.edx = 0x0000;
      task->t.flags = 0;

      err = uvesafb_exec(task);

      if (err || (task->t.regs.eax & 0xffff) != 0x004f) {
            printk(KERN_WARNING "uvesafb: VBE state buffer size "
                  "cannot be determined (eax=0x%x, err=%d)\n",
                  task->t.regs.eax, err);
            par->vbe_state_size = 0;
            return;
      }

      par->vbe_state_size = 64 * (task->t.regs.ebx & 0xffff);
}

static int __devinit uvesafb_vbe_init(struct fb_info *info)
{
      struct uvesafb_ktask *task = NULL;
      struct uvesafb_par *par = info->par;
      int err;

      task = uvesafb_prep();
      if (!task)
            return -ENOMEM;

      err = uvesafb_vbe_getinfo(task, par);
      if (err)
            goto out;

      err = uvesafb_vbe_getmodes(task, par);
      if (err)
            goto out;

      par->nocrtc = nocrtc;
#ifdef CONFIG_X86_32
      par->pmi_setpal = pmi_setpal;
      par->ypan = ypan;

      if (par->pmi_setpal || par->ypan)
            uvesafb_vbe_getpmi(task, par);
#else
      /* The protected mode interface is not available on non-x86. */
      par->pmi_setpal = par->ypan = 0;
#endif

      INIT_LIST_HEAD(&info->modelist);
      uvesafb_vbe_getmonspecs(task, info);
      uvesafb_vbe_getstatesize(task, par);

out:  uvesafb_free(task);
      return err;
}

static int __devinit uvesafb_vbe_init_mode(struct fb_info *info)
{
      struct list_head *pos;
      struct fb_modelist *modelist;
      struct fb_videomode *mode;
      struct uvesafb_par *par = info->par;
      int i, modeid;

      /* Has the user requested a specific VESA mode? */
      if (vbemode) {
            for (i = 0; i < par->vbe_modes_cnt; i++) {
                  if (par->vbe_modes[i].mode_id == vbemode) {
                        fb_get_mode(FB_VSYNCTIMINGS | FB_IGNOREMON, 60,
                                          &info->var, info);
                        /*
                         * With pixclock set to 0, the default BIOS
                         * timings will be used in set_par().
                         */
                        info->var.pixclock = 0;
                        modeid = i;
                        goto gotmode;
                  }
            }
            printk(KERN_INFO "uvesafb: requested VBE mode 0x%x is "
                         "unavailable\n", vbemode);
            vbemode = 0;
      }

      /* Count the modes in the modelist */
      i = 0;
      list_for_each(pos, &info->modelist)
            i++;

      /*
       * Convert the modelist into a modedb so that we can use it with
       * fb_find_mode().
       */
      mode = kzalloc(i * sizeof(*mode), GFP_KERNEL);
      if (mode) {
            i = 0;
            list_for_each(pos, &info->modelist) {
                  modelist = list_entry(pos, struct fb_modelist, list);
                  mode[i] = modelist->mode;
                  i++;
            }

            if (!mode_option)
                  mode_option = UVESAFB_DEFAULT_MODE;

            i = fb_find_mode(&info->var, info, mode_option, mode, i,
                  NULL, 8);

            kfree(mode);
      }

      /* fb_find_mode() failed */
      if (i == 0 || i >= 3) {
            info->var.xres = 640;
            info->var.yres = 480;
            mode = (struct fb_videomode *)
                        fb_find_best_mode(&info->var, &info->modelist);

            if (mode) {
                  fb_videomode_to_var(&info->var, mode);
            } else {
                  modeid = par->vbe_modes[0].mode_id;
                  fb_get_mode(FB_VSYNCTIMINGS | FB_IGNOREMON, 60,
                            &info->var, info);
                  goto gotmode;
            }
      }

      /* Look for a matching VBE mode. */
      modeid = uvesafb_vbe_find_mode(par, info->var.xres, info->var.yres,
                  info->var.bits_per_pixel, UVESAFB_EXACT_RES);

      if (modeid == -1)
            return -EINVAL;

gotmode:
      uvesafb_setup_var(&info->var, info, &par->vbe_modes[modeid]);

      /*
       * If we are not VBE3.0+ compliant, we're done -- the BIOS will
       * ignore our timings anyway.
       */
      if (par->vbe_ib.vbe_version < 0x0300 || par->nocrtc)
            fb_get_mode(FB_VSYNCTIMINGS | FB_IGNOREMON, 60,
                              &info->var, info);

      return modeid;
}

static int uvesafb_setpalette(struct uvesafb_pal_entry *entries, int count,
            int start, struct fb_info *info)
{
      struct uvesafb_ktask *task;
#ifdef CONFIG_X86
      struct uvesafb_par *par = info->par;
      int i = par->mode_idx;
#endif
      int err = 0;

      /*
       * We support palette modifications for 8 bpp modes only, so
       * there can never be more than 256 entries.
       */
      if (start + count > 256)
            return -EINVAL;

#ifdef CONFIG_X86
      /* Use VGA registers if mode is VGA-compatible. */
      if (i >= 0 && i < par->vbe_modes_cnt &&
          par->vbe_modes[i].mode_attr & VBE_MODE_VGACOMPAT) {
            for (i = 0; i < count; i++) {
                  outb_p(start + i,        dac_reg);
                  outb_p(entries[i].red,   dac_val);
                  outb_p(entries[i].green, dac_val);
                  outb_p(entries[i].blue,  dac_val);
            }
      }
#ifdef CONFIG_X86_32
      else if (par->pmi_setpal) {
            __asm__ __volatile__(
            "call *(%%esi)"
            : /* no return value */
            : "a" (0x4f09),         /* EAX */
              "b" (0),              /* EBX */
              "c" (count),          /* ECX */
              "d" (start),          /* EDX */
              "D" (entries),        /* EDI */
              "S" (&par->pmi_pal)); /* ESI */
      }
#endif /* CONFIG_X86_32 */
      else
#endif /* CONFIG_X86 */
      {
            task = uvesafb_prep();
            if (!task)
                  return -ENOMEM;

            task->t.regs.eax = 0x4f09;
            task->t.regs.ebx = 0x0;
            task->t.regs.ecx = count;
            task->t.regs.edx = start;
            task->t.flags = TF_BUF_ESDI;
            task->t.buf_len = sizeof(struct uvesafb_pal_entry) * count;
            task->buf = entries;

            err = uvesafb_exec(task);
            if ((task->t.regs.eax & 0xffff) != 0x004f)
                  err = 1;

            uvesafb_free(task);
      }
      return err;
}

static int uvesafb_setcolreg(unsigned regno, unsigned red, unsigned green,
            unsigned blue, unsigned transp,
            struct fb_info *info)
{
      struct uvesafb_pal_entry entry;
      int shift = 16 - info->var.green.length;
      int err = 0;

      if (regno >= info->cmap.len)
            return -EINVAL;

      if (info->var.bits_per_pixel == 8) {
            entry.red   = red   >> shift;
            entry.green = green >> shift;
            entry.blue  = blue  >> shift;
            entry.pad   = 0;

            err = uvesafb_setpalette(&entry, 1, regno, info);
      } else if (regno < 16) {
            switch (info->var.bits_per_pixel) {
            case 16:
                  if (info->var.red.offset == 10) {
                        /* 1:5:5:5 */
                        ((u32 *) (info->pseudo_palette))[regno] =
                                    ((red   & 0xf800) >>  1) |
                                    ((green & 0xf800) >>  6) |
                                    ((blue  & 0xf800) >> 11);
                  } else {
                        /* 0:5:6:5 */
                        ((u32 *) (info->pseudo_palette))[regno] =
                                    ((red   & 0xf800)      ) |
                                    ((green & 0xfc00) >>  5) |
                                    ((blue  & 0xf800) >> 11);
                  }
                  break;

            case 24:
            case 32:
                  red   >>= 8;
                  green >>= 8;
                  blue  >>= 8;
                  ((u32 *)(info->pseudo_palette))[regno] =
                        (red   << info->var.red.offset)   |
                        (green << info->var.green.offset) |
                        (blue  << info->var.blue.offset);
                  break;
            }
      }
      return err;
}

static int uvesafb_setcmap(struct fb_cmap *cmap, struct fb_info *info)
{
      struct uvesafb_pal_entry *entries;
      int shift = 16 - info->var.green.length;
      int i, err = 0;

      if (info->var.bits_per_pixel == 8) {
            if (cmap->start + cmap->len > info->cmap.start +
                info->cmap.len || cmap->start < info->cmap.start)
                  return -EINVAL;

            entries = kmalloc(sizeof(*entries) * cmap->len, GFP_KERNEL);
            if (!entries)
                  return -ENOMEM;

            for (i = 0; i < cmap->len; i++) {
                  entries[i].red   = cmap->red[i]   >> shift;
                  entries[i].green = cmap->green[i] >> shift;
                  entries[i].blue  = cmap->blue[i]  >> shift;
                  entries[i].pad   = 0;
            }
            err = uvesafb_setpalette(entries, cmap->len, cmap->start, info);
            kfree(entries);
      } else {
            /*
             * For modes with bpp > 8, we only set the pseudo palette in
             * the fb_info struct. We rely on uvesafb_setcolreg to do all
             * sanity checking.
             */
            for (i = 0; i < cmap->len; i++) {
                  err |= uvesafb_setcolreg(cmap->start + i, cmap->red[i],
                                    cmap->green[i], cmap->blue[i],
                                    0, info);
            }
      }
      return err;
}

static int uvesafb_pan_display(struct fb_var_screeninfo *var,
            struct fb_info *info)
{
#ifdef CONFIG_X86_32
      int offset;
      struct uvesafb_par *par = info->par;

      offset = (var->yoffset * info->fix.line_length + var->xoffset) / 4;

      /*
       * It turns out it's not the best idea to do panning via vm86,
       * so we only allow it if we have a PMI.
       */
      if (par->pmi_start) {
            __asm__ __volatile__(
                  "call *(%%edi)"
                  : /* no return value */
                  : "a" (0x4f07),         /* EAX */
                    "b" (0),              /* EBX */
                    "c" (offset),         /* ECX */
                    "d" (offset >> 16),   /* EDX */
                    "D" (&par->pmi_start));    /* EDI */
      }
#endif
      return 0;
}

static int uvesafb_blank(int blank, struct fb_info *info)
{
      struct uvesafb_ktask *task;
      int err = 1;
#ifdef CONFIG_X86
      struct uvesafb_par *par = info->par;

      if (par->vbe_ib.capabilities & VBE_CAP_VGACOMPAT) {
            int loop = 10000;
            u8 seq = 0, crtc17 = 0;

            if (blank == FB_BLANK_POWERDOWN) {
                  seq = 0x20;
                  crtc17 = 0x00;
                  err = 0;
            } else {
                  seq = 0x00;
                  crtc17 = 0x80;
                  err = (blank == FB_BLANK_UNBLANK) ? 0 : -EINVAL;
            }

            vga_wseq(NULL, 0x00, 0x01);
            seq |= vga_rseq(NULL, 0x01) & ~0x20;
            vga_wseq(NULL, 0x00, seq);

            crtc17 |= vga_rcrt(NULL, 0x17) & ~0x80;
            while (loop--);
            vga_wcrt(NULL, 0x17, crtc17);
            vga_wseq(NULL, 0x00, 0x03);
      } else
#endif /* CONFIG_X86 */
      {
            task = uvesafb_prep();
            if (!task)
                  return -ENOMEM;

            task->t.regs.eax = 0x4f10;
            switch (blank) {
            case FB_BLANK_UNBLANK:
                  task->t.regs.ebx = 0x0001;
                  break;
            case FB_BLANK_NORMAL:
                  task->t.regs.ebx = 0x0101;    /* standby */
                  break;
            case FB_BLANK_POWERDOWN:
                  task->t.regs.ebx = 0x0401;    /* powerdown */
                  break;
            default:
                  goto out;
            }

            err = uvesafb_exec(task);
            if (err || (task->t.regs.eax & 0xffff) != 0x004f)
                  err = 1;
out:        uvesafb_free(task);
      }
      return err;
}

static int uvesafb_open(struct fb_info *info, int user)
{
      struct uvesafb_par *par = info->par;
      int cnt = atomic_read(&par->ref_count);

      if (!cnt && par->vbe_state_size)
            par->vbe_state_orig = uvesafb_vbe_state_save(par);

      atomic_inc(&par->ref_count);
      return 0;
}

static int uvesafb_release(struct fb_info *info, int user)
{
      struct uvesafb_ktask *task = NULL;
      struct uvesafb_par *par = info->par;
      int cnt = atomic_read(&par->ref_count);

      if (!cnt)
            return -EINVAL;

      if (cnt != 1)
            goto out;

      task = uvesafb_prep();
      if (!task)
            goto out;

      /* First, try to set the standard 80x25 text mode. */
      task->t.regs.eax = 0x0003;
      uvesafb_exec(task);

      /*
       * Now try to restore whatever hardware state we might have
       * saved when the fb device was first opened.
       */
      uvesafb_vbe_state_restore(par, par->vbe_state_orig);
out:
      atomic_dec(&par->ref_count);
      if (task)
            uvesafb_free(task);
      return 0;
}

static int uvesafb_set_par(struct fb_info *info)
{
      struct uvesafb_par *par = info->par;
      struct uvesafb_ktask *task = NULL;
      struct vbe_crtc_ib *crtc = NULL;
      struct vbe_mode_ib *mode = NULL;
      int i, err = 0, depth = info->var.bits_per_pixel;

      if (depth > 8 && depth != 32)
            depth = info->var.red.length + info->var.green.length +
                  info->var.blue.length;

      i = uvesafb_vbe_find_mode(par, info->var.xres, info->var.yres, depth,
                         UVESAFB_EXACT_RES | UVESAFB_EXACT_DEPTH);
      if (i >= 0)
            mode = &par->vbe_modes[i];
      else
            return -EINVAL;

      task = uvesafb_prep();
      if (!task)
            return -ENOMEM;
setmode:
      task->t.regs.eax = 0x4f02;
      task->t.regs.ebx = mode->mode_id | 0x4000;      /* use LFB */

      if (par->vbe_ib.vbe_version >= 0x0300 && !par->nocrtc &&
          info->var.pixclock != 0) {
            task->t.regs.ebx |= 0x0800;         /* use CRTC data */
            task->t.flags = TF_BUF_ESDI;
            crtc = kzalloc(sizeof(struct vbe_crtc_ib), GFP_KERNEL);
            if (!crtc) {
                  err = -ENOMEM;
                  goto out;
            }
            crtc->horiz_start = info->var.xres + info->var.right_margin;
            crtc->horiz_end     = crtc->horiz_start + info->var.hsync_len;
            crtc->horiz_total = crtc->horiz_end + info->var.left_margin;

            crtc->vert_start  = info->var.yres + info->var.lower_margin;
            crtc->vert_end    = crtc->vert_start + info->var.vsync_len;
            crtc->vert_total  = crtc->vert_end + info->var.upper_margin;

            crtc->pixel_clock = PICOS2KHZ(info->var.pixclock) * 1000;
            crtc->refresh_rate = (u16)(100 * (crtc->pixel_clock /
                        (crtc->vert_total * crtc->horiz_total)));

            if (info->var.vmode & FB_VMODE_DOUBLE)
                  crtc->flags |= 0x1;
            if (info->var.vmode & FB_VMODE_INTERLACED)
                  crtc->flags |= 0x2;
            if (!(info->var.sync & FB_SYNC_HOR_HIGH_ACT))
                  crtc->flags |= 0x4;
            if (!(info->var.sync & FB_SYNC_VERT_HIGH_ACT))
                  crtc->flags |= 0x8;
            memcpy(&par->crtc, crtc, sizeof(*crtc));
      } else {
            memset(&par->crtc, 0, sizeof(*crtc));
      }

      task->t.buf_len = sizeof(struct vbe_crtc_ib);
      task->buf = &par->crtc;

      err = uvesafb_exec(task);
      if (err || (task->t.regs.eax & 0xffff) != 0x004f) {
            /*
             * The mode switch might have failed because we tried to
             * use our own timings.  Try again with the default timings.
             */
            if (crtc != NULL) {
                  printk(KERN_WARNING "uvesafb: mode switch failed "
                        "(eax=0x%x, err=%d). Trying again with "
                        "default timings.\n", task->t.regs.eax, err);
                  uvesafb_reset(task);
                  kfree(crtc);
                  crtc = NULL;
                  info->var.pixclock = 0;
                  goto setmode;
            } else {
                  printk(KERN_ERR "uvesafb: mode switch failed (eax="
                        "0x%x, err=%d)\n", task->t.regs.eax, err);
                  err = -EINVAL;
                  goto out;
            }
      }
      par->mode_idx = i;

      /* For 8bpp modes, always try to set the DAC to 8 bits. */
      if (par->vbe_ib.capabilities & VBE_CAP_CAN_SWITCH_DAC &&
          mode->bits_per_pixel <= 8) {
            uvesafb_reset(task);
            task->t.regs.eax = 0x4f08;
            task->t.regs.ebx = 0x0800;

            err = uvesafb_exec(task);
            if (err || (task->t.regs.eax & 0xffff) != 0x004f ||
                ((task->t.regs.ebx & 0xff00) >> 8) != 8) {
                  /*
                   * We've failed to set the DAC palette format -
                   * time to correct var.
                   */
                  info->var.red.length    = 6;
                  info->var.green.length  = 6;
                  info->var.blue.length   = 6;
            }
      }

      info->fix.visual = (info->var.bits_per_pixel == 8) ?
                        FB_VISUAL_PSEUDOCOLOR : FB_VISUAL_TRUECOLOR;
      info->fix.line_length = mode->bytes_per_scan_line;

out:  if (crtc != NULL)
            kfree(crtc);
      uvesafb_free(task);

      return err;
}

static void uvesafb_check_limits(struct fb_var_screeninfo *var,
            struct fb_info *info)
{
      const struct fb_videomode *mode;
      struct uvesafb_par *par = info->par;

      /*
       * If pixclock is set to 0, then we're using default BIOS timings
       * and thus don't have to perform any checks here.
       */
      if (!var->pixclock)
            return;

      if (par->vbe_ib.vbe_version < 0x0300) {
            fb_get_mode(FB_VSYNCTIMINGS | FB_IGNOREMON, 60, var, info);
            return;
      }

      if (!fb_validate_mode(var, info))
            return;

      mode = fb_find_best_mode(var, &info->modelist);
      if (mode) {
            if (mode->xres == var->xres && mode->yres == var->yres &&
                !(mode->vmode & (FB_VMODE_INTERLACED | FB_VMODE_DOUBLE))) {
                  fb_videomode_to_var(var, mode);
                  return;
            }
      }

      if (info->monspecs.gtf && !fb_get_mode(FB_MAXTIMINGS, 0, var, info))
            return;
      /* Use default refresh rate */
      var->pixclock = 0;
}

static int uvesafb_check_var(struct fb_var_screeninfo *var,
            struct fb_info *info)
{
      struct uvesafb_par *par = info->par;
      struct vbe_mode_ib *mode = NULL;
      int match = -1;
      int depth = var->red.length + var->green.length + var->blue.length;

      /*
       * Various apps will use bits_per_pixel to set the color depth,
       * which is theoretically incorrect, but which we'll try to handle
       * here.
       */
      if (depth == 0 || abs(depth - var->bits_per_pixel) >= 8)
            depth = var->bits_per_pixel;

      match = uvesafb_vbe_find_mode(par, var->xres, var->yres, depth,
                                    UVESAFB_EXACT_RES);
      if (match == -1)
            return -EINVAL;

      mode = &par->vbe_modes[match];
      uvesafb_setup_var(var, info, mode);

      /*
       * Check whether we have remapped enough memory for this mode.
       * We might be called at an early stage, when we haven't remapped
       * any memory yet, in which case we simply skip the check.
       */
      if (var->yres * mode->bytes_per_scan_line > info->fix.smem_len
                                    && info->fix.smem_len)
            return -EINVAL;

      if ((var->vmode & FB_VMODE_DOUBLE) &&
                        !(par->vbe_modes[match].mode_attr & 0x100))
            var->vmode &= ~FB_VMODE_DOUBLE;

      if ((var->vmode & FB_VMODE_INTERLACED) &&
                        !(par->vbe_modes[match].mode_attr & 0x200))
            var->vmode &= ~FB_VMODE_INTERLACED;

      uvesafb_check_limits(var, info);

      var->xres_virtual = var->xres;
      var->yres_virtual = (par->ypan) ?
                        info->fix.smem_len / mode->bytes_per_scan_line :
                        var->yres;
      return 0;
}

static void uvesafb_save_state(struct fb_info *info)
{
      struct uvesafb_par *par = info->par;

      if (par->vbe_state_saved)
            kfree(par->vbe_state_saved);

      par->vbe_state_saved = uvesafb_vbe_state_save(par);
}

static void uvesafb_restore_state(struct fb_info *info)
{
      struct uvesafb_par *par = info->par;

      uvesafb_vbe_state_restore(par, par->vbe_state_saved);
}

static struct fb_ops uvesafb_ops = {
      .owner            = THIS_MODULE,
      .fb_open    = uvesafb_open,
      .fb_release = uvesafb_release,
      .fb_setcolreg     = uvesafb_setcolreg,
      .fb_setcmap = uvesafb_setcmap,
      .fb_pan_display   = uvesafb_pan_display,
      .fb_blank   = uvesafb_blank,
      .fb_fillrect      = cfb_fillrect,
      .fb_copyarea      = cfb_copyarea,
      .fb_imageblit     = cfb_imageblit,
      .fb_check_var     = uvesafb_check_var,
      .fb_set_par = uvesafb_set_par,
      .fb_save_state    = uvesafb_save_state,
      .fb_restore_state = uvesafb_restore_state,
};

static void __devinit uvesafb_init_info(struct fb_info *info,
            struct vbe_mode_ib *mode)
{
      unsigned int size_vmode;
      unsigned int size_remap;
      unsigned int size_total;
      struct uvesafb_par *par = info->par;
      int i, h;

      info->pseudo_palette = ((u8 *)info->par + sizeof(struct uvesafb_par));
      info->fix = uvesafb_fix;
      info->fix.ypanstep = par->ypan ? 1 : 0;
      info->fix.ywrapstep = (par->ypan > 1) ? 1 : 0;

      /*
       * If we were unable to get the state buffer size, disable
       * functions for saving and restoring the hardware state.
       */
      if (par->vbe_state_size == 0) {
            info->fbops->fb_save_state = NULL;
            info->fbops->fb_restore_state = NULL;
      }

      /* Disable blanking if the user requested so. */
      if (!blank)
            info->fbops->fb_blank = NULL;

      /*
       * Find out how much IO memory is required for the mode with
       * the highest resolution.
       */
      size_remap = 0;
      for (i = 0; i < par->vbe_modes_cnt; i++) {
            h = par->vbe_modes[i].bytes_per_scan_line *
                              par->vbe_modes[i].y_res;
            if (h > size_remap)
                  size_remap = h;
      }
      size_remap *= 2;

      /*
       *   size_vmode -- that is the amount of memory needed for the
       *                 used video mode, i.e. the minimum amount of
       *                 memory we need.
       */
      if (mode != NULL) {
            size_vmode = info->var.yres * mode->bytes_per_scan_line;
      } else {
            size_vmode = info->var.yres * info->var.xres *
                       ((info->var.bits_per_pixel + 7) >> 3);
      }

      /*
       *   size_total -- all video memory we have. Used for mtrr
       *                 entries, resource allocation and bounds
       *                 checking.
       */
      size_total = par->vbe_ib.total_memory * 65536;
      if (vram_total)
            size_total = vram_total * 1024 * 1024;
      if (size_total < size_vmode)
            size_total = size_vmode;

      /*
       *   size_remap -- the amount of video memory we are going to
       *                 use for vesafb.  With modern cards it is no
       *                 option to simply use size_total as th
       *                 wastes plenty of kernel address space.
       */
      if (vram_remap)
            size_remap = vram_remap * 1024 * 1024;
      if (size_remap < size_vmode)
            size_remap = size_vmode;
      if (size_remap > size_total)
            size_remap = size_total;

      info->fix.smem_len = size_remap;
      info->fix.smem_start = mode->phys_base_ptr;

      /*
       * We have to set yres_virtual here because when setup_var() was
       * called, smem_len wasn't defined yet.
       */
      info->var.yres_virtual = info->fix.smem_len /
                         mode->bytes_per_scan_line;

      if (par->ypan && info->var.yres_virtual > info->var.yres) {
            printk(KERN_INFO "uvesafb: scrolling: %s "
                  "using protected mode interface, "
                  "yres_virtual=%d\n",
                  (par->ypan > 1) ? "ywrap" : "ypan",
                  info->var.yres_virtual);
      } else {
            printk(KERN_INFO "uvesafb: scrolling: redraw\n");
            info->var.yres_virtual = info->var.yres;
            par->ypan = 0;
      }

      info->flags = FBINFO_FLAG_DEFAULT |
                  (par->ypan) ? FBINFO_HWACCEL_YPAN : 0;

      if (!par->ypan)
            info->fbops->fb_pan_display = NULL;
}

static void __devinit uvesafb_init_mtrr(struct fb_info *info)
{
#ifdef CONFIG_MTRR
      if (mtrr && !(info->fix.smem_start & (PAGE_SIZE - 1))) {
            int temp_size = info->fix.smem_len;
            unsigned int type = 0;

            switch (mtrr) {
            case 1:
                  type = MTRR_TYPE_UNCACHABLE;
                  break;
            case 2:
                  type = MTRR_TYPE_WRBACK;
                  break;
            case 3:
                  type = MTRR_TYPE_WRCOMB;
                  break;
            case 4:
                  type = MTRR_TYPE_WRTHROUGH;
                  break;
            default:
                  type = 0;
                  break;
            }

            if (type) {
                  int rc;

                  /* Find the largest power-of-two */
                  while (temp_size & (temp_size - 1))
                        temp_size &= (temp_size - 1);

                  /* Try and find a power of two to add */
                  do {
                        rc = mtrr_add(info->fix.smem_start,
                                    temp_size, type, 1);
                        temp_size >>= 1;
                  } while (temp_size >= PAGE_SIZE && rc == -EINVAL);
            }
      }
#endif /* CONFIG_MTRR */
}


static ssize_t uvesafb_show_vbe_ver(struct device *dev,
            struct device_attribute *attr, char *buf)
{
      struct fb_info *info = platform_get_drvdata(to_platform_device(dev));
      struct uvesafb_par *par = info->par;

      return snprintf(buf, PAGE_SIZE, "%.4x\n", par->vbe_ib.vbe_version);
}

static DEVICE_ATTR(vbe_version, S_IRUGO, uvesafb_show_vbe_ver, NULL);

static ssize_t uvesafb_show_vbe_modes(struct device *dev,
            struct device_attribute *attr, char *buf)
{
      struct fb_info *info = platform_get_drvdata(to_platform_device(dev));
      struct uvesafb_par *par = info->par;
      int ret = 0, i;

      for (i = 0; i < par->vbe_modes_cnt && ret < PAGE_SIZE; i++) {
            ret += snprintf(buf + ret, PAGE_SIZE - ret,
                  "%dx%d-%d, 0x%.4x\n",
                  par->vbe_modes[i].x_res, par->vbe_modes[i].y_res,
                  par->vbe_modes[i].depth, par->vbe_modes[i].mode_id);
      }

      return ret;
}

static DEVICE_ATTR(vbe_modes, S_IRUGO, uvesafb_show_vbe_modes, NULL);

static ssize_t uvesafb_show_vendor(struct device *dev,
            struct device_attribute *attr, char *buf)
{
      struct fb_info *info = platform_get_drvdata(to_platform_device(dev));
      struct uvesafb_par *par = info->par;

      if (par->vbe_ib.oem_vendor_name_ptr)
            return snprintf(buf, PAGE_SIZE, "%s\n", (char *)
                  (&par->vbe_ib) + par->vbe_ib.oem_vendor_name_ptr);
      else
            return 0;
}

static DEVICE_ATTR(oem_vendor, S_IRUGO, uvesafb_show_vendor, NULL);

static ssize_t uvesafb_show_product_name(struct device *dev,
            struct device_attribute *attr, char *buf)
{
      struct fb_info *info = platform_get_drvdata(to_platform_device(dev));
      struct uvesafb_par *par = info->par;

      if (par->vbe_ib.oem_product_name_ptr)
            return snprintf(buf, PAGE_SIZE, "%s\n", (char *)
                  (&par->vbe_ib) + par->vbe_ib.oem_product_name_ptr);
      else
            return 0;
}

static DEVICE_ATTR(oem_product_name, S_IRUGO, uvesafb_show_product_name, NULL);

static ssize_t uvesafb_show_product_rev(struct device *dev,
            struct device_attribute *attr, char *buf)
{
      struct fb_info *info = platform_get_drvdata(to_platform_device(dev));
      struct uvesafb_par *par = info->par;

      if (par->vbe_ib.oem_product_rev_ptr)
            return snprintf(buf, PAGE_SIZE, "%s\n", (char *)
                  (&par->vbe_ib) + par->vbe_ib.oem_product_rev_ptr);
      else
            return 0;
}

static DEVICE_ATTR(oem_product_rev, S_IRUGO, uvesafb_show_product_rev, NULL);

static ssize_t uvesafb_show_oem_string(struct device *dev,
            struct device_attribute *attr, char *buf)
{
      struct fb_info *info = platform_get_drvdata(to_platform_device(dev));
      struct uvesafb_par *par = info->par;

      if (par->vbe_ib.oem_string_ptr)
            return snprintf(buf, PAGE_SIZE, "%s\n",
                  (char *)(&par->vbe_ib) + par->vbe_ib.oem_string_ptr);
      else
            return 0;
}

static DEVICE_ATTR(oem_string, S_IRUGO, uvesafb_show_oem_string, NULL);

static ssize_t uvesafb_show_nocrtc(struct device *dev,
            struct device_attribute *attr, char *buf)
{
      struct fb_info *info = platform_get_drvdata(to_platform_device(dev));
      struct uvesafb_par *par = info->par;

      return snprintf(buf, PAGE_SIZE, "%d\n", par->nocrtc);
}

static ssize_t uvesafb_store_nocrtc(struct device *dev,
            struct device_attribute *attr, const char *buf, size_t count)
{
      struct fb_info *info = platform_get_drvdata(to_platform_device(dev));
      struct uvesafb_par *par = info->par;

      if (count > 0) {
            if (buf[0] == '0')
                  par->nocrtc = 0;
            else
                  par->nocrtc = 1;
      }
      return count;
}

static DEVICE_ATTR(nocrtc, S_IRUGO | S_IWUSR, uvesafb_show_nocrtc,
                  uvesafb_store_nocrtc);

static struct attribute *uvesafb_dev_attrs[] = {
      &dev_attr_vbe_version.attr,
      &dev_attr_vbe_modes.attr,
      &dev_attr_oem_vendor.attr,
      &dev_attr_oem_product_name.attr,
      &dev_attr_oem_product_rev.attr,
      &dev_attr_oem_string.attr,
      &dev_attr_nocrtc.attr,
      NULL,
};

static struct attribute_group uvesafb_dev_attgrp = {
      .name = NULL,
      .attrs = uvesafb_dev_attrs,
};

static int __devinit uvesafb_probe(struct platform_device *dev)
{
      struct fb_info *info;
      struct vbe_mode_ib *mode = NULL;
      struct uvesafb_par *par;
      int err = 0, i;

      info = framebuffer_alloc(sizeof(*par) +   sizeof(u32) * 256, &dev->dev);
      if (!info)
            return -ENOMEM;

      par = info->par;

      err = uvesafb_vbe_init(info);
      if (err) {
            printk(KERN_ERR "uvesafb: vbe_init() failed with %d\n", err);
            goto out;
      }

      info->fbops = &uvesafb_ops;

      i = uvesafb_vbe_init_mode(info);
      if (i < 0) {
            err = -EINVAL;
            goto out;
      } else {
            mode = &par->vbe_modes[i];
      }

      if (fb_alloc_cmap(&info->cmap, 256, 0) < 0) {
            err = -ENXIO;
            goto out;
      }

      uvesafb_init_info(info, mode);

      if (!request_mem_region(info->fix.smem_start, info->fix.smem_len,
                        "uvesafb")) {
            printk(KERN_ERR "uvesafb: cannot reserve video memory at "
                        "0x%lx\n", info->fix.smem_start);
            err = -EIO;
            goto out_mode;
      }

      info->screen_base = ioremap(info->fix.smem_start, info->fix.smem_len);

      if (!info->screen_base) {
            printk(KERN_ERR
                  "uvesafb: abort, cannot ioremap 0x%x bytes of video "
                  "memory at 0x%lx\n",
                  info->fix.smem_len, info->fix.smem_start);
            err = -EIO;
            goto out_mem;
      }

      if (!request_region(0x3c0, 32, "uvesafb")) {
            printk(KERN_ERR "uvesafb: request region 0x3c0-0x3e0 failed\n");
            err = -EIO;
            goto out_unmap;
      }

      uvesafb_init_mtrr(info);
      platform_set_drvdata(dev, info);

      if (register_framebuffer(info) < 0) {
            printk(KERN_ERR
                  "uvesafb: failed to register framebuffer device\n");
            err = -EINVAL;
            goto out_reg;
      }

      printk(KERN_INFO "uvesafb: framebuffer at 0x%lx, mapped to 0x%p, "
                  "using %dk, total %dk\n", info->fix.smem_start,
                  info->screen_base, info->fix.smem_len/1024,
                  par->vbe_ib.total_memory * 64);
      printk(KERN_INFO "fb%d: %s frame buffer device\n", info->node,
                  info->fix.id);

      err = sysfs_create_group(&dev->dev.kobj, &uvesafb_dev_attgrp);
      if (err != 0)
            printk(KERN_WARNING "fb%d: failed to register attributes\n",
                  info->node);

      return 0;

out_reg:
      release_region(0x3c0, 32);
out_unmap:
      iounmap(info->screen_base);
out_mem:
      release_mem_region(info->fix.smem_start, info->fix.smem_len);
out_mode:
      if (!list_empty(&info->modelist))
            fb_destroy_modelist(&info->modelist);
      fb_destroy_modedb(info->monspecs.modedb);
      fb_dealloc_cmap(&info->cmap);
out:
      if (par->vbe_modes)
            kfree(par->vbe_modes);

      framebuffer_release(info);
      return err;
}

static int uvesafb_remove(struct platform_device *dev)
{
      struct fb_info *info = platform_get_drvdata(dev);

      if (info) {
            struct uvesafb_par *par = info->par;

            sysfs_remove_group(&dev->dev.kobj, &uvesafb_dev_attgrp);
            unregister_framebuffer(info);
            release_region(0x3c0, 32);
            iounmap(info->screen_base);
            release_mem_region(info->fix.smem_start, info->fix.smem_len);
            fb_destroy_modedb(info->monspecs.modedb);
            fb_dealloc_cmap(&info->cmap);

            if (par) {
                  if (par->vbe_modes)
                        kfree(par->vbe_modes);
                  if (par->vbe_state_orig)
                        kfree(par->vbe_state_orig);
                  if (par->vbe_state_saved)
                        kfree(par->vbe_state_saved);
            }

            framebuffer_release(info);
      }
      return 0;
}

static struct platform_driver uvesafb_driver = {
      .probe  = uvesafb_probe,
      .remove = uvesafb_remove,
      .driver = {
            .name = "uvesafb",
      },
};

static struct platform_device *uvesafb_device;

#ifndef MODULE
static int __devinit uvesafb_setup(char *options)
{
      char *this_opt;

      if (!options || !*options)
            return 0;

      while ((this_opt = strsep(&options, ",")) != NULL) {
            if (!*this_opt) continue;

            if (!strcmp(this_opt, "redraw"))
                  ypan = 0;
            else if (!strcmp(this_opt, "ypan"))
                  ypan = 1;
            else if (!strcmp(this_opt, "ywrap"))
                  ypan = 2;
            else if (!strcmp(this_opt, "vgapal"))
                  pmi_setpal = 0;
            else if (!strcmp(this_opt, "pmipal"))
                  pmi_setpal = 1;
            else if (!strncmp(this_opt, "mtrr:", 5))
                  mtrr = simple_strtoul(this_opt+5, NULL, 0);
            else if (!strcmp(this_opt, "nomtrr"))
                  mtrr = 0;
            else if (!strcmp(this_opt, "nocrtc"))
                  nocrtc = 1;
            else if (!strcmp(this_opt, "noedid"))
                  noedid = 1;
            else if (!strcmp(this_opt, "noblank"))
                  blank = 0;
            else if (!strncmp(this_opt, "vtotal:", 7))
                  vram_total = simple_strtoul(this_opt + 7, NULL, 0);
            else if (!strncmp(this_opt, "vremap:", 7))
                  vram_remap = simple_strtoul(this_opt + 7, NULL, 0);
            else if (!strncmp(this_opt, "maxhf:", 6))
                  maxhf = simple_strtoul(this_opt + 6, NULL, 0);
            else if (!strncmp(this_opt, "maxvf:", 6))
                  maxvf = simple_strtoul(this_opt + 6, NULL, 0);
            else if (!strncmp(this_opt, "maxclk:", 7))
                  maxclk = simple_strtoul(this_opt + 7, NULL, 0);
            else if (!strncmp(this_opt, "vbemode:", 8))
                  vbemode = simple_strtoul(this_opt + 8, NULL, 0);
            else if (this_opt[0] >= '0' && this_opt[0] <= '9') {
                  mode_option = this_opt;
            } else {
                  printk(KERN_WARNING
                        "uvesafb: unrecognized option %s\n", this_opt);
            }
      }

      return 0;
}
#endif /* !MODULE */

static ssize_t show_v86d(struct device_driver *dev, char *buf)
{
      return snprintf(buf, PAGE_SIZE, "%s\n", v86d_path);
}

static ssize_t store_v86d(struct device_driver *dev, const char *buf,
            size_t count)
{
      strncpy(v86d_path, buf, PATH_MAX);
      return count;
}

static DRIVER_ATTR(v86d, S_IRUGO | S_IWUSR, show_v86d, store_v86d);

static int __devinit uvesafb_init(void)
{
      int err;

#ifndef MODULE
      char *option = NULL;

      if (fb_get_options("uvesafb", &option))
            return -ENODEV;
      uvesafb_setup(option);
#endif
      err = cn_add_callback(&uvesafb_cn_id, "uvesafb", uvesafb_cn_callback);
      if (err)
            return err;

      err = platform_driver_register(&uvesafb_driver);

      if (!err) {
            uvesafb_device = platform_device_alloc("uvesafb", 0);
            if (uvesafb_device)
                  err = platform_device_add(uvesafb_device);
            else
                  err = -ENOMEM;

            if (err) {
                  platform_device_put(uvesafb_device);
                  platform_driver_unregister(&uvesafb_driver);
                  cn_del_callback(&uvesafb_cn_id);
                  return err;
            }

            err = driver_create_file(&uvesafb_driver.driver,
                        &driver_attr_v86d);
            if (err) {
                  printk(KERN_WARNING "uvesafb: failed to register "
                              "attributes\n");
                  err = 0;
            }
      }
      return err;
}

module_init(uvesafb_init);

static void __devexit uvesafb_exit(void)
{
      struct uvesafb_ktask *task;

      if (v86d_started) {
            task = uvesafb_prep();
            if (task) {
                  task->t.flags = TF_EXIT;
                  uvesafb_exec(task);
                  uvesafb_free(task);
            }
      }

      cn_del_callback(&uvesafb_cn_id);
      driver_remove_file(&uvesafb_driver.driver, &driver_attr_v86d);
      platform_device_unregister(uvesafb_device);
      platform_driver_unregister(&uvesafb_driver);
}

module_exit(uvesafb_exit);

static inline int param_get_scroll(char *buffer, struct kernel_param *kp)
{
      return 0;
}

static inline int param_set_scroll(const char *val, struct kernel_param *kp)
{
      ypan = 0;

      if (!strcmp(val, "redraw"))
            ypan = 0;
      else if (!strcmp(val, "ypan"))
            ypan = 1;
      else if (!strcmp(val, "ywrap"))
            ypan = 2;

      return 0;
}

#define param_check_scroll(name, p) __param_check(name, p, void);

module_param_named(scroll, ypan, scroll, 0);
MODULE_PARM_DESC(scroll,
      "Scrolling mode, set to 'redraw', ''ypan' or 'ywrap'");
module_param_named(vgapal, pmi_setpal, invbool, 0);
MODULE_PARM_DESC(vgapal, "Set palette using VGA registers");
module_param_named(pmipal, pmi_setpal, bool, 0);
MODULE_PARM_DESC(pmipal, "Set palette using PMI calls");
module_param(mtrr, uint, 0);
MODULE_PARM_DESC(mtrr,
      "Memory Type Range Registers setting. Use 0 to disable.");
module_param(blank, bool, 0);
MODULE_PARM_DESC(blank, "Enable hardware blanking");
module_param(nocrtc, bool, 0);
MODULE_PARM_DESC(nocrtc, "Ignore CRTC timings when setting modes");
module_param(noedid, bool, 0);
MODULE_PARM_DESC(noedid,
      "Ignore EDID-provided monitor limits when setting modes");
module_param(vram_remap, uint, 0);
MODULE_PARM_DESC(vram_remap, "Set amount of video memory to be used [MiB]");
module_param(vram_total, uint, 0);
MODULE_PARM_DESC(vram_total, "Set total amount of video memoery [MiB]");
module_param(maxclk, ushort, 0);
MODULE_PARM_DESC(maxclk, "Maximum pixelclock [MHz], overrides EDID data");
module_param(maxhf, ushort, 0);
MODULE_PARM_DESC(maxhf,
      "Maximum horizontal frequency [kHz], overrides EDID data");
module_param(maxvf, ushort, 0);
MODULE_PARM_DESC(maxvf,
      "Maximum vertical frequency [Hz], overrides EDID data");
module_param_named(mode, mode_option, charp, 0);
MODULE_PARM_DESC(mode,
      "Specify initial video mode as \"<xres>x<yres>[-<bpp>][@<refresh>]\"");
module_param(vbemode, ushort, 0);
MODULE_PARM_DESC(vbemode,
      "VBE mode number to set, overrides the 'mode' option");
module_param_string(v86d, v86d_path, PATH_MAX, 0660);
MODULE_PARM_DESC(v86d, "Path to the v86d userspace helper.");

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Michal Januszewski <spock@gentoo.org>");
MODULE_DESCRIPTION("Framebuffer driver for VBE2.0+ compliant graphics boards");


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