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omapfb_main.c

/*
 * Framebuffer driver for TI OMAP boards
 *
 * Copyright (C) 2004 Nokia Corporation
 * Author: Imre Deak <imre.deak@nokia.com>
 *
 * Acknowledgements:
 *   Alex McMains <aam@ridgerun.com>       - Original driver
 *   Juha Yrjola <juha.yrjola@nokia.com>   - Original driver and improvements
 *   Dirk Behme <dirk.behme@de.bosch.com>  - changes for 2.6 kernel API
 *   Texas Instruments                     - H3 support
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the
 * Free Software Foundation; either version 2 of the License, or (at your
 * option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 */
#include <linux/platform_device.h>
#include <linux/uaccess.h>

#include <asm/mach-types.h>
#include <asm/arch/dma.h>
#include <asm/arch/omapfb.h>

#define MODULE_NAME     "omapfb"

static unsigned int     def_accel;
static unsigned long    def_vram[OMAPFB_PLANE_NUM];
static int        def_vram_cnt;
static unsigned long    def_vxres;
static unsigned long    def_vyres;
static unsigned int     def_rotate;
static unsigned int     def_mirror;

#ifdef CONFIG_FB_OMAP_MANUAL_UPDATE
static int        manual_update = 1;
#else
static int        manual_update;
#endif

static struct platform_device *fbdev_pdev;
static struct lcd_panel       *fbdev_panel;
static struct omapfb_device   *omapfb_dev;

struct caps_table_struct {
      unsigned long flag;
      const char *name;
};

static struct caps_table_struct ctrl_caps[] = {
      { OMAPFB_CAPS_MANUAL_UPDATE,  "manual update" },
      { OMAPFB_CAPS_TEARSYNC,       "tearing synchronization" },
      { OMAPFB_CAPS_PLANE_RELOCATE_MEM, "relocate plane memory" },
      { OMAPFB_CAPS_PLANE_SCALE,    "scale plane" },
      { OMAPFB_CAPS_WINDOW_PIXEL_DOUBLE, "pixel double window" },
      { OMAPFB_CAPS_WINDOW_SCALE,   "scale window" },
      { OMAPFB_CAPS_WINDOW_OVERLAY, "overlay window" },
      { OMAPFB_CAPS_SET_BACKLIGHT,  "backlight setting" },
};

static struct caps_table_struct color_caps[] = {
      { 1 << OMAPFB_COLOR_RGB565,   "RGB565", },
      { 1 << OMAPFB_COLOR_YUV422,   "YUV422", },
      { 1 << OMAPFB_COLOR_YUV420,   "YUV420", },
      { 1 << OMAPFB_COLOR_CLUT_8BPP,      "CLUT8", },
      { 1 << OMAPFB_COLOR_CLUT_4BPP,      "CLUT4", },
      { 1 << OMAPFB_COLOR_CLUT_2BPP,      "CLUT2", },
      { 1 << OMAPFB_COLOR_CLUT_1BPP,      "CLUT1", },
      { 1 << OMAPFB_COLOR_RGB444,   "RGB444", },
      { 1 << OMAPFB_COLOR_YUY422,   "YUY422", },
};

/*
 * ---------------------------------------------------------------------------
 * LCD panel
 * ---------------------------------------------------------------------------
 */
extern struct lcd_ctrl omap1_int_ctrl;
extern struct lcd_ctrl omap2_int_ctrl;
extern struct lcd_ctrl hwa742_ctrl;
extern struct lcd_ctrl blizzard_ctrl;

static struct lcd_ctrl *ctrls[] = {
#ifdef CONFIG_ARCH_OMAP1
      &omap1_int_ctrl,
#else
      &omap2_int_ctrl,
#endif

#ifdef CONFIG_FB_OMAP_LCDC_HWA742
      &hwa742_ctrl,
#endif
#ifdef CONFIG_FB_OMAP_LCDC_BLIZZARD
      &blizzard_ctrl,
#endif
};

#ifdef CONFIG_FB_OMAP_LCDC_EXTERNAL
#ifdef CONFIG_ARCH_OMAP1
extern struct lcd_ctrl_extif omap1_ext_if;
#else
extern struct lcd_ctrl_extif omap2_ext_if;
#endif
#endif

static void omapfb_rqueue_lock(struct omapfb_device *fbdev)
{
      mutex_lock(&fbdev->rqueue_mutex);
}

static void omapfb_rqueue_unlock(struct omapfb_device *fbdev)
{
      mutex_unlock(&fbdev->rqueue_mutex);
}

/*
 * ---------------------------------------------------------------------------
 * LCD controller and LCD DMA
 * ---------------------------------------------------------------------------
 */
/* Lookup table to map elem size to elem type. */
static const int dma_elem_type[] = {
      0,
      OMAP_DMA_DATA_TYPE_S8,
      OMAP_DMA_DATA_TYPE_S16,
      0,
      OMAP_DMA_DATA_TYPE_S32,
};

/*
 * Allocate resources needed for LCD controller and LCD DMA operations. Video
 * memory is allocated from system memory according to the virtual display
 * size, except if a bigger memory size is specified explicitly as a kernel
 * parameter.
 */
static int ctrl_init(struct omapfb_device *fbdev)
{
      int r;
      int i;

      /* kernel/module vram parameters override boot tags/board config */
      if (def_vram_cnt) {
            for (i = 0; i < def_vram_cnt; i++)
                  fbdev->mem_desc.region[i].size =
                        PAGE_ALIGN(def_vram[i]);
            fbdev->mem_desc.region_cnt = i;
      } else {
            struct omapfb_platform_data *conf;

            conf = fbdev->dev->platform_data;
            fbdev->mem_desc = conf->mem_desc;
      }

      if (!fbdev->mem_desc.region_cnt) {
            struct lcd_panel *panel = fbdev->panel;
            int def_size;
            int bpp = panel->bpp;

            /* 12 bpp is packed in 16 bits */
            if (bpp == 12)
                  bpp = 16;
            def_size = def_vxres * def_vyres * bpp / 8;
            fbdev->mem_desc.region_cnt = 1;
            fbdev->mem_desc.region[0].size = PAGE_ALIGN(def_size);
      }
      r = fbdev->ctrl->init(fbdev, 0, &fbdev->mem_desc);
      if (r < 0) {
            dev_err(fbdev->dev, "controller initialization failed (%d)\n",
                  r);
            return r;
      }

#ifdef DEBUG
      for (i = 0; i < fbdev->mem_desc.region_cnt; i++) {
            dev_dbg(fbdev->dev, "region%d phys %08x virt %p size=%lu\n",
                   i,
                   fbdev->mem_desc.region[i].paddr,
                   fbdev->mem_desc.region[i].vaddr,
                   fbdev->mem_desc.region[i].size);
      }
#endif
      return 0;
}

static void ctrl_cleanup(struct omapfb_device *fbdev)
{
      fbdev->ctrl->cleanup();
}

/* Must be called with fbdev->rqueue_mutex held. */
static int ctrl_change_mode(struct fb_info *fbi)
{
      int r;
      unsigned long offset;
      struct omapfb_plane_struct *plane = fbi->par;
      struct omapfb_device *fbdev = plane->fbdev;
      struct fb_var_screeninfo *var = &fbi->var;

      offset = var->yoffset * fbi->fix.line_length +
             var->xoffset * var->bits_per_pixel / 8;

      if (fbdev->ctrl->sync)
            fbdev->ctrl->sync();
      r = fbdev->ctrl->setup_plane(plane->idx, plane->info.channel_out,
                         offset, var->xres_virtual,
                         plane->info.pos_x, plane->info.pos_y,
                         var->xres, var->yres, plane->color_mode);
      if (fbdev->ctrl->set_scale != NULL)
            r = fbdev->ctrl->set_scale(plane->idx,
                           var->xres, var->yres,
                           plane->info.out_width,
                           plane->info.out_height);

      return r;
}

/*
 * ---------------------------------------------------------------------------
 * fbdev framework callbacks and the ioctl interface
 * ---------------------------------------------------------------------------
 */
/* Called each time the omapfb device is opened */
static int omapfb_open(struct fb_info *info, int user)
{
      return 0;
}

static void omapfb_sync(struct fb_info *info);

/* Called when the omapfb device is closed. We make sure that any pending
 * gfx DMA operations are ended, before we return. */
static int omapfb_release(struct fb_info *info, int user)
{
      omapfb_sync(info);
      return 0;
}

/* Store a single color palette entry into a pseudo palette or the hardware
 * palette if one is available. For now we support only 16bpp and thus store
 * the entry only to the pseudo palette.
 */
static int _setcolreg(struct fb_info *info, u_int regno, u_int red, u_int green,
                  u_int blue, u_int transp, int update_hw_pal)
{
      struct omapfb_plane_struct *plane = info->par;
      struct omapfb_device *fbdev = plane->fbdev;
      struct fb_var_screeninfo *var = &info->var;
      int r = 0;

      switch (plane->color_mode) {
      case OMAPFB_COLOR_YUV422:
      case OMAPFB_COLOR_YUV420:
      case OMAPFB_COLOR_YUY422:
            r = -EINVAL;
            break;
      case OMAPFB_COLOR_CLUT_8BPP:
      case OMAPFB_COLOR_CLUT_4BPP:
      case OMAPFB_COLOR_CLUT_2BPP:
      case OMAPFB_COLOR_CLUT_1BPP:
            if (fbdev->ctrl->setcolreg)
                  r = fbdev->ctrl->setcolreg(regno, red, green, blue,
                                          transp, update_hw_pal);
            /* Fallthrough */
      case OMAPFB_COLOR_RGB565:
      case OMAPFB_COLOR_RGB444:
            if (r != 0)
                  break;

            if (regno < 0) {
                  r = -EINVAL;
                  break;
            }

            if (regno < 16) {
                  u16 pal;
                  pal = ((red >> (16 - var->red.length)) <<
                              var->red.offset) |
                        ((green >> (16 - var->green.length)) <<
                              var->green.offset) |
                        (blue >> (16 - var->blue.length));
                  ((u32 *)(info->pseudo_palette))[regno] = pal;
            }
            break;
      default:
            BUG();
      }
      return r;
}

static int omapfb_setcolreg(u_int regno, u_int red, u_int green, u_int blue,
                      u_int transp, struct fb_info *info)
{
      return _setcolreg(info, regno, red, green, blue, transp, 1);
}

static int omapfb_setcmap(struct fb_cmap *cmap, struct fb_info *info)
{
      int count, index, r;
      u16 *red, *green, *blue, *transp;
      u16 trans = 0xffff;

      red     = cmap->red;
      green   = cmap->green;
      blue    = cmap->blue;
      transp  = cmap->transp;
      index   = cmap->start;

      for (count = 0; count < cmap->len; count++) {
            if (transp)
                  trans = *transp++;
            r = _setcolreg(info, index++, *red++, *green++, *blue++, trans,
                        count == cmap->len - 1);
            if (r != 0)
                  return r;
      }

      return 0;
}

static int omapfb_update_full_screen(struct fb_info *fbi);

static int omapfb_blank(int blank, struct fb_info *fbi)
{
      struct omapfb_plane_struct *plane = fbi->par;
      struct omapfb_device *fbdev = plane->fbdev;
      int do_update = 0;
      int r = 0;

      omapfb_rqueue_lock(fbdev);
      switch (blank) {
      case VESA_NO_BLANKING:
            if (fbdev->state == OMAPFB_SUSPENDED) {
                  if (fbdev->ctrl->resume)
                        fbdev->ctrl->resume();
                  fbdev->panel->enable(fbdev->panel);
                  fbdev->state = OMAPFB_ACTIVE;
                  if (fbdev->ctrl->get_update_mode() ==
                              OMAPFB_MANUAL_UPDATE)
                        do_update = 1;
            }
            break;
      case VESA_POWERDOWN:
            if (fbdev->state == OMAPFB_ACTIVE) {
                  fbdev->panel->disable(fbdev->panel);
                  if (fbdev->ctrl->suspend)
                        fbdev->ctrl->suspend();
                  fbdev->state = OMAPFB_SUSPENDED;
            }
            break;
      default:
            r = -EINVAL;
      }
      omapfb_rqueue_unlock(fbdev);

      if (r == 0 && do_update)
            r = omapfb_update_full_screen(fbi);

      return r;
}

static void omapfb_sync(struct fb_info *fbi)
{
      struct omapfb_plane_struct *plane = fbi->par;
      struct omapfb_device *fbdev = plane->fbdev;

      omapfb_rqueue_lock(fbdev);
      if (fbdev->ctrl->sync)
            fbdev->ctrl->sync();
      omapfb_rqueue_unlock(fbdev);
}

/*
 * Set fb_info.fix fields and also updates fbdev.
 * When calling this fb_info.var must be set up already.
 */
static void set_fb_fix(struct fb_info *fbi)
{
      struct fb_fix_screeninfo *fix = &fbi->fix;
      struct fb_var_screeninfo *var = &fbi->var;
      struct omapfb_plane_struct *plane = fbi->par;
      struct omapfb_mem_region *rg;
      int bpp;

      rg = &plane->fbdev->mem_desc.region[plane->idx];
      fbi->screen_base  = (char __iomem *)rg->vaddr;
      fix->smem_start         = rg->paddr;
      fix->smem_len           = rg->size;

      fix->type = FB_TYPE_PACKED_PIXELS;
      bpp = var->bits_per_pixel;
      if (var->nonstd)
            fix->visual = FB_VISUAL_PSEUDOCOLOR;
      else switch (var->bits_per_pixel) {
      case 16:
      case 12:
            fix->visual = FB_VISUAL_TRUECOLOR;
            /* 12bpp is stored in 16 bits */
            bpp = 16;
            break;
      case 1:
      case 2:
      case 4:
      case 8:
            fix->visual = FB_VISUAL_PSEUDOCOLOR;
            break;
      }
      fix->accel        = FB_ACCEL_OMAP1610;
      fix->line_length  = var->xres_virtual * bpp / 8;
}

static int set_color_mode(struct omapfb_plane_struct *plane,
                    struct fb_var_screeninfo *var)
{
      switch (var->nonstd) {
      case 0:
            break;
      case OMAPFB_COLOR_YUV422:
            var->bits_per_pixel = 16;
            plane->color_mode = var->nonstd;
            return 0;
      case OMAPFB_COLOR_YUV420:
            var->bits_per_pixel = 12;
            plane->color_mode = var->nonstd;
            return 0;
      case OMAPFB_COLOR_YUY422:
            var->bits_per_pixel = 16;
            plane->color_mode = var->nonstd;
            return 0;
      default:
            return -EINVAL;
      }

      switch (var->bits_per_pixel) {
      case 1:
            plane->color_mode = OMAPFB_COLOR_CLUT_1BPP;
            return 0;
      case 2:
            plane->color_mode = OMAPFB_COLOR_CLUT_2BPP;
            return 0;
      case 4:
            plane->color_mode = OMAPFB_COLOR_CLUT_4BPP;
            return 0;
      case 8:
            plane->color_mode = OMAPFB_COLOR_CLUT_8BPP;
            return 0;
      case 12:
            var->bits_per_pixel = 16;
            plane->color_mode = OMAPFB_COLOR_RGB444;
            return 0;
      case 16:
            plane->color_mode = OMAPFB_COLOR_RGB565;
            return 0;
      default:
            return -EINVAL;
      }
}

/*
 * Check the values in var against our capabilities and in case of out of
 * bound values try to adjust them.
 */
static int set_fb_var(struct fb_info *fbi,
                  struct fb_var_screeninfo *var)
{
      int         bpp;
      unsigned long     max_frame_size;
      unsigned long     line_size;
      int         xres_min, xres_max;
      int         yres_min, yres_max;
      struct omapfb_plane_struct *plane = fbi->par;
      struct omapfb_device *fbdev = plane->fbdev;
      struct lcd_panel *panel = fbdev->panel;

      if (set_color_mode(plane, var) < 0)
            return -EINVAL;

      bpp = var->bits_per_pixel;
      if (plane->color_mode == OMAPFB_COLOR_RGB444)
            bpp = 16;

      switch (var->rotate) {
      case 0:
      case 180:
            xres_min = OMAPFB_PLANE_XRES_MIN;
            xres_max = panel->x_res;
            yres_min = OMAPFB_PLANE_YRES_MIN;
            yres_max = panel->y_res;
            if (cpu_is_omap15xx()) {
                  var->xres = panel->x_res;
                  var->yres = panel->y_res;
            }
            break;
      case 90:
      case 270:
            xres_min = OMAPFB_PLANE_YRES_MIN;
            xres_max = panel->y_res;
            yres_min = OMAPFB_PLANE_XRES_MIN;
            yres_max = panel->x_res;
            if (cpu_is_omap15xx()) {
                  var->xres = panel->y_res;
                  var->yres = panel->x_res;
            }
            break;
      default:
            return -EINVAL;
      }

      if (var->xres < xres_min)
            var->xres = xres_min;
      if (var->yres < yres_min)
            var->yres = yres_min;
      if (var->xres > xres_max)
            var->xres = xres_max;
      if (var->yres > yres_max)
            var->yres = yres_max;

      if (var->xres_virtual < var->xres)
            var->xres_virtual = var->xres;
      if (var->yres_virtual < var->yres)
            var->yres_virtual = var->yres;
      max_frame_size = fbdev->mem_desc.region[plane->idx].size;
      line_size = var->xres_virtual * bpp / 8;
      if (line_size * var->yres_virtual > max_frame_size) {
            /* Try to keep yres_virtual first */
            line_size = max_frame_size / var->yres_virtual;
            var->xres_virtual = line_size * 8 / bpp;
            if (var->xres_virtual < var->xres) {
                  /* Still doesn't fit. Shrink yres_virtual too */
                  var->xres_virtual = var->xres;
                  line_size = var->xres * bpp / 8;
                  var->yres_virtual = max_frame_size / line_size;
            }
            /* Recheck this, as the virtual size changed. */
            if (var->xres_virtual < var->xres)
                  var->xres = var->xres_virtual;
            if (var->yres_virtual < var->yres)
                  var->yres = var->yres_virtual;
            if (var->xres < xres_min || var->yres < yres_min)
                  return -EINVAL;
      }
      if (var->xres + var->xoffset > var->xres_virtual)
            var->xoffset = var->xres_virtual - var->xres;
      if (var->yres + var->yoffset > var->yres_virtual)
            var->yoffset = var->yres_virtual - var->yres;
      line_size = var->xres * bpp / 8;

      if (plane->color_mode == OMAPFB_COLOR_RGB444) {
            var->red.offset     = 8; var->red.length   = 4;
                                    var->red.msb_right   = 0;
            var->green.offset = 4; var->green.length = 4;
                                    var->green.msb_right = 0;
            var->blue.offset  = 0; var->blue.length  = 4;
                                    var->blue.msb_right  = 0;
      } else {
            var->red.offset    = 11; var->red.length   = 5;
                                    var->red.msb_right   = 0;
            var->green.offset = 5;  var->green.length = 6;
                                    var->green.msb_right = 0;
            var->blue.offset = 0;  var->blue.length  = 5;
                                    var->blue.msb_right  = 0;
      }

      var->height       = -1;
      var->width        = -1;
      var->grayscale          = 0;

      /* pixclock in ps, the rest in pixclock */
      var->pixclock           = 10000000 / (panel->pixel_clock / 100);
      var->left_margin  = panel->hfp;
      var->right_margin = panel->hbp;
      var->upper_margin = panel->vfp;
      var->lower_margin = panel->vbp;
      var->hsync_len          = panel->hsw;
      var->vsync_len          = panel->vsw;

      /* TODO: get these from panel->config */
      var->vmode        = FB_VMODE_NONINTERLACED;
      var->sync         = 0;

      return 0;
}


/* Set rotation (0, 90, 180, 270 degree), and switch to the new mode. */
static void omapfb_rotate(struct fb_info *fbi, int rotate)
{
      struct omapfb_plane_struct *plane = fbi->par;
      struct omapfb_device *fbdev = plane->fbdev;

      omapfb_rqueue_lock(fbdev);
      if (cpu_is_omap15xx() && rotate != fbi->var.rotate) {
            struct fb_var_screeninfo *new_var = &fbdev->new_var;

            memcpy(new_var, &fbi->var, sizeof(*new_var));
            new_var->rotate = rotate;
            if (set_fb_var(fbi, new_var) == 0 &&
                memcmp(new_var, &fbi->var, sizeof(*new_var))) {
                  memcpy(&fbi->var, new_var, sizeof(*new_var));
                  ctrl_change_mode(fbi);
            }
      }
      omapfb_rqueue_unlock(fbdev);
}

/*
 * Set new x,y offsets in the virtual display for the visible area and switch
 * to the new mode.
 */
static int omapfb_pan_display(struct fb_var_screeninfo *var,
                         struct fb_info *fbi)
{
      struct omapfb_plane_struct *plane = fbi->par;
      struct omapfb_device *fbdev = plane->fbdev;
      int r = 0;

      omapfb_rqueue_lock(fbdev);
      if (var->xoffset != fbi->var.xoffset ||
          var->yoffset != fbi->var.yoffset) {
            struct fb_var_screeninfo *new_var = &fbdev->new_var;

            memcpy(new_var, &fbi->var, sizeof(*new_var));
            new_var->xoffset = var->xoffset;
            new_var->yoffset = var->yoffset;
            if (set_fb_var(fbi, new_var))
                  r = -EINVAL;
            else {
                  memcpy(&fbi->var, new_var, sizeof(*new_var));
                  ctrl_change_mode(fbi);
            }
      }
      omapfb_rqueue_unlock(fbdev);

      return r;
}

/* Set mirror to vertical axis and switch to the new mode. */
static int omapfb_mirror(struct fb_info *fbi, int mirror)
{
      struct omapfb_plane_struct *plane = fbi->par;
      struct omapfb_device *fbdev = plane->fbdev;
      int r = 0;

      omapfb_rqueue_lock(fbdev);
      mirror = mirror ? 1 : 0;
      if (cpu_is_omap15xx())
            r = -EINVAL;
      else if (mirror != plane->info.mirror) {
            plane->info.mirror = mirror;
            r = ctrl_change_mode(fbi);
      }
      omapfb_rqueue_unlock(fbdev);

      return r;
}

/*
 * Check values in var, try to adjust them in case of out of bound values if
 * possible, or return error.
 */
static int omapfb_check_var(struct fb_var_screeninfo *var, struct fb_info *fbi)
{
      struct omapfb_plane_struct *plane = fbi->par;
      struct omapfb_device *fbdev = plane->fbdev;
      int r;

      omapfb_rqueue_lock(fbdev);
      if (fbdev->ctrl->sync != NULL)
            fbdev->ctrl->sync();
      r = set_fb_var(fbi, var);
      omapfb_rqueue_unlock(fbdev);

      return r;
}

/*
 * Switch to a new mode. The parameters for it has been check already by
 * omapfb_check_var.
 */
static int omapfb_set_par(struct fb_info *fbi)
{
      struct omapfb_plane_struct *plane = fbi->par;
      struct omapfb_device *fbdev = plane->fbdev;
      int r = 0;

      omapfb_rqueue_lock(fbdev);
      set_fb_fix(fbi);
      r = ctrl_change_mode(fbi);
      omapfb_rqueue_unlock(fbdev);

      return r;
}

int omapfb_update_window_async(struct fb_info *fbi,
                        struct omapfb_update_window *win,
                        void (*callback)(void *),
                        void *callback_data)
{
      struct omapfb_plane_struct *plane = fbi->par;
      struct omapfb_device *fbdev = plane->fbdev;
      struct fb_var_screeninfo *var;

      var = &fbi->var;
      if (win->x >= var->xres || win->y >= var->yres ||
          win->out_x > var->xres || win->out_y >= var->yres)
            return -EINVAL;

      if (!fbdev->ctrl->update_window ||
          fbdev->ctrl->get_update_mode() != OMAPFB_MANUAL_UPDATE)
            return -ENODEV;

      if (win->x + win->width >= var->xres)
            win->width = var->xres - win->x;
      if (win->y + win->height >= var->yres)
            win->height = var->yres - win->y;
      /* The out sizes should be cropped to the LCD size */
      if (win->out_x + win->out_width > fbdev->panel->x_res)
            win->out_width = fbdev->panel->x_res - win->out_x;
      if (win->out_y + win->out_height > fbdev->panel->y_res)
            win->out_height = fbdev->panel->y_res - win->out_y;
      if (!win->width || !win->height || !win->out_width || !win->out_height)
            return 0;

      return fbdev->ctrl->update_window(fbi, win, callback, callback_data);
}
EXPORT_SYMBOL(omapfb_update_window_async);

static int omapfb_update_win(struct fb_info *fbi,
                        struct omapfb_update_window *win)
{
      struct omapfb_plane_struct *plane = fbi->par;
      int ret;

      omapfb_rqueue_lock(plane->fbdev);
      ret = omapfb_update_window_async(fbi, win, NULL, 0);
      omapfb_rqueue_unlock(plane->fbdev);

      return ret;
}

static int omapfb_update_full_screen(struct fb_info *fbi)
{
      struct omapfb_plane_struct *plane = fbi->par;
      struct omapfb_device *fbdev = plane->fbdev;
      struct omapfb_update_window win;
      int r;

      if (!fbdev->ctrl->update_window ||
          fbdev->ctrl->get_update_mode() != OMAPFB_MANUAL_UPDATE)
            return -ENODEV;

      win.x = 0;
      win.y = 0;
      win.width = fbi->var.xres;
      win.height = fbi->var.yres;
      win.out_x = 0;
      win.out_y = 0;
      win.out_width = fbi->var.xres;
      win.out_height = fbi->var.yres;
      win.format = 0;

      omapfb_rqueue_lock(fbdev);
      r = fbdev->ctrl->update_window(fbi, &win, NULL, 0);
      omapfb_rqueue_unlock(fbdev);

      return r;
}

static int omapfb_setup_plane(struct fb_info *fbi, struct omapfb_plane_info *pi)
{
      struct omapfb_plane_struct *plane = fbi->par;
      struct omapfb_device *fbdev = plane->fbdev;
      struct lcd_panel *panel = fbdev->panel;
      struct omapfb_plane_info old_info;
      int r = 0;

      if (pi->pos_x + pi->out_width > panel->x_res ||
          pi->pos_y + pi->out_height > panel->y_res)
            return -EINVAL;

      omapfb_rqueue_lock(fbdev);
      if (pi->enabled && !fbdev->mem_desc.region[plane->idx].size) {
            /*
             * This plane's memory was freed, can't enable it
             * until it's reallocated.
             */
            r = -EINVAL;
            goto out;
      }
      old_info = plane->info;
      plane->info = *pi;
      if (pi->enabled) {
            r = ctrl_change_mode(fbi);
            if (r < 0) {
                  plane->info = old_info;
                  goto out;
            }
      }
      r = fbdev->ctrl->enable_plane(plane->idx, pi->enabled);
      if (r < 0) {
            plane->info = old_info;
            goto out;
      }
out:
      omapfb_rqueue_unlock(fbdev);
      return r;
}

static int omapfb_query_plane(struct fb_info *fbi, struct omapfb_plane_info *pi)
{
      struct omapfb_plane_struct *plane = fbi->par;

      *pi = plane->info;
      return 0;
}

static int omapfb_setup_mem(struct fb_info *fbi, struct omapfb_mem_info *mi)
{
      struct omapfb_plane_struct *plane = fbi->par;
      struct omapfb_device *fbdev = plane->fbdev;
      struct omapfb_mem_region *rg = &fbdev->mem_desc.region[plane->idx];
      size_t size;
      int r = 0;

      if (fbdev->ctrl->setup_mem == NULL)
            return -ENODEV;
      if (mi->type > OMAPFB_MEMTYPE_MAX)
            return -EINVAL;

      size = PAGE_ALIGN(mi->size);
      omapfb_rqueue_lock(fbdev);
      if (plane->info.enabled) {
            r = -EBUSY;
            goto out;
      }
      if (rg->size != size || rg->type != mi->type) {
            struct fb_var_screeninfo *new_var = &fbdev->new_var;
            unsigned long old_size = rg->size;
            u8          old_type = rg->type;
            unsigned long paddr;

            rg->size = size;
            rg->type = mi->type;
            /*
             * size == 0 is a special case, for which we
             * don't check / adjust the screen parameters.
             * This isn't a problem since the plane can't
             * be reenabled unless its size is > 0.
             */
            if (old_size != size && size) {
                  if (size) {
                        memcpy(new_var, &fbi->var, sizeof(*new_var));
                        r = set_fb_var(fbi, new_var);
                        if (r < 0)
                              goto out;
                  }
            }

            if (fbdev->ctrl->sync)
                  fbdev->ctrl->sync();
            r = fbdev->ctrl->setup_mem(plane->idx, size, mi->type, &paddr);
            if (r < 0) {
                  /* Revert changes. */
                  rg->size = old_size;
                  rg->type = old_type;
                  goto out;
            }
            rg->paddr = paddr;

            if (old_size != size) {
                  if (size) {
                        memcpy(&fbi->var, new_var, sizeof(fbi->var));
                        set_fb_fix(fbi);
                  } else {
                        /*
                         * Set these explicitly to indicate that the
                         * plane memory is dealloce'd, the other
                         * screen parameters in var / fix are invalid.
                         */
                        fbi->fix.smem_start = 0;
                        fbi->fix.smem_len = 0;
                  }
            }
      }
out:
      omapfb_rqueue_unlock(fbdev);

      return r;
}

static int omapfb_query_mem(struct fb_info *fbi, struct omapfb_mem_info *mi)
{
      struct omapfb_plane_struct *plane = fbi->par;
      struct omapfb_device *fbdev = plane->fbdev;
      struct omapfb_mem_region *rg;

      rg = &fbdev->mem_desc.region[plane->idx];
      memset(mi, 0, sizeof(*mi));
      mi->size = rg->size;
      mi->type = rg->type;

      return 0;
}

static int omapfb_set_color_key(struct omapfb_device *fbdev,
                        struct omapfb_color_key *ck)
{
      int r;

      if (!fbdev->ctrl->set_color_key)
            return -ENODEV;

      omapfb_rqueue_lock(fbdev);
      r = fbdev->ctrl->set_color_key(ck);
      omapfb_rqueue_unlock(fbdev);

      return r;
}

static int omapfb_get_color_key(struct omapfb_device *fbdev,
                        struct omapfb_color_key *ck)
{
      int r;

      if (!fbdev->ctrl->get_color_key)
            return -ENODEV;

      omapfb_rqueue_lock(fbdev);
      r = fbdev->ctrl->get_color_key(ck);
      omapfb_rqueue_unlock(fbdev);

      return r;
}

static struct blocking_notifier_head omapfb_client_list[OMAPFB_PLANE_NUM];
static int notifier_inited;

static void omapfb_init_notifier(void)
{
      int i;

      for (i = 0; i < OMAPFB_PLANE_NUM; i++)
            BLOCKING_INIT_NOTIFIER_HEAD(&omapfb_client_list[i]);
}

int omapfb_register_client(struct omapfb_notifier_block *omapfb_nb,
                        omapfb_notifier_callback_t callback,
                        void *callback_data)
{
      int r;

      if ((unsigned)omapfb_nb->plane_idx > OMAPFB_PLANE_NUM)
            return -EINVAL;

      if (!notifier_inited) {
            omapfb_init_notifier();
            notifier_inited = 1;
      }

      omapfb_nb->nb.notifier_call = (int (*)(struct notifier_block *,
                              unsigned long, void *))callback;
      omapfb_nb->data = callback_data;
      r = blocking_notifier_chain_register(
                        &omapfb_client_list[omapfb_nb->plane_idx],
                        &omapfb_nb->nb);
      if (r)
            return r;
      if (omapfb_dev != NULL &&
          omapfb_dev->ctrl && omapfb_dev->ctrl->bind_client) {
            omapfb_dev->ctrl->bind_client(omapfb_nb);
      }

      return 0;
}
EXPORT_SYMBOL(omapfb_register_client);

int omapfb_unregister_client(struct omapfb_notifier_block *omapfb_nb)
{
      return blocking_notifier_chain_unregister(
            &omapfb_client_list[omapfb_nb->plane_idx], &omapfb_nb->nb);
}
EXPORT_SYMBOL(omapfb_unregister_client);

void omapfb_notify_clients(struct omapfb_device *fbdev, unsigned long event)
{
      int i;

      if (!notifier_inited)
            /* no client registered yet */
            return;

      for (i = 0; i < OMAPFB_PLANE_NUM; i++)
            blocking_notifier_call_chain(&omapfb_client_list[i], event,
                            fbdev->fb_info[i]);
}
EXPORT_SYMBOL(omapfb_notify_clients);

static int omapfb_set_update_mode(struct omapfb_device *fbdev,
                           enum omapfb_update_mode mode)
{
      int r;

      omapfb_rqueue_lock(fbdev);
      r = fbdev->ctrl->set_update_mode(mode);
      omapfb_rqueue_unlock(fbdev);

      return r;
}

static enum omapfb_update_mode omapfb_get_update_mode(struct omapfb_device *fbdev)
{
      int r;

      omapfb_rqueue_lock(fbdev);
      r = fbdev->ctrl->get_update_mode();
      omapfb_rqueue_unlock(fbdev);

      return r;
}

static void omapfb_get_caps(struct omapfb_device *fbdev, int plane,
                             struct omapfb_caps *caps)
{
      memset(caps, 0, sizeof(*caps));
      fbdev->ctrl->get_caps(plane, caps);
      caps->ctrl |= fbdev->panel->get_caps(fbdev->panel);
}

/* For lcd testing */
void omapfb_write_first_pixel(struct omapfb_device *fbdev, u16 pixval)
{
      omapfb_rqueue_lock(fbdev);
      *(u16 *)fbdev->mem_desc.region[0].vaddr = pixval;
      if (fbdev->ctrl->get_update_mode() == OMAPFB_MANUAL_UPDATE) {
            struct omapfb_update_window win;

            memset(&win, 0, sizeof(win));
            win.width = 2;
            win.height = 2;
            win.out_width = 2;
            win.out_height = 2;
            fbdev->ctrl->update_window(fbdev->fb_info[0], &win, NULL, 0);
      }
      omapfb_rqueue_unlock(fbdev);
}
EXPORT_SYMBOL(omapfb_write_first_pixel);

/*
 * Ioctl interface. Part of the kernel mode frame buffer API is duplicated
 * here to be accessible by user mode code.
 */
static int omapfb_ioctl(struct fb_info *fbi, unsigned int cmd,
                  unsigned long arg)
{
      struct omapfb_plane_struct *plane = fbi->par;
      struct omapfb_device    *fbdev = plane->fbdev;
      struct fb_ops           *ops = fbi->fbops;
      union {
            struct omapfb_update_window   update_window;
            struct omapfb_plane_info      plane_info;
            struct omapfb_mem_info        mem_info;
            struct omapfb_color_key       color_key;
            enum omapfb_update_mode       update_mode;
            struct omapfb_caps            caps;
            unsigned int            mirror;
            int               plane_out;
            int               enable_plane;
      } p;
      int r = 0;

      BUG_ON(!ops);
      switch (cmd) {
      case OMAPFB_MIRROR:
            if (get_user(p.mirror, (int __user *)arg))
                  r = -EFAULT;
            else
                  omapfb_mirror(fbi, p.mirror);
            break;
      case OMAPFB_SYNC_GFX:
            omapfb_sync(fbi);
            break;
      case OMAPFB_VSYNC:
            break;
      case OMAPFB_SET_UPDATE_MODE:
            if (get_user(p.update_mode, (int __user *)arg))
                  r = -EFAULT;
            else
                  r = omapfb_set_update_mode(fbdev, p.update_mode);
            break;
      case OMAPFB_GET_UPDATE_MODE:
            p.update_mode = omapfb_get_update_mode(fbdev);
            if (put_user(p.update_mode,
                              (enum omapfb_update_mode __user *)arg))
                  r = -EFAULT;
            break;
      case OMAPFB_UPDATE_WINDOW_OLD:
            if (copy_from_user(&p.update_window, (void __user *)arg,
                           sizeof(struct omapfb_update_window_old)))
                  r = -EFAULT;
            else {
                  struct omapfb_update_window *u = &p.update_window;
                  u->out_x = u->x;
                  u->out_y = u->y;
                  u->out_width = u->width;
                  u->out_height = u->height;
                  memset(u->reserved, 0, sizeof(u->reserved));
                  r = omapfb_update_win(fbi, u);
            }
            break;
      case OMAPFB_UPDATE_WINDOW:
            if (copy_from_user(&p.update_window, (void __user *)arg,
                           sizeof(p.update_window)))
                  r = -EFAULT;
            else
                  r = omapfb_update_win(fbi, &p.update_window);
            break;
      case OMAPFB_SETUP_PLANE:
            if (copy_from_user(&p.plane_info, (void __user *)arg,
                           sizeof(p.plane_info)))
                  r = -EFAULT;
            else
                  r = omapfb_setup_plane(fbi, &p.plane_info);
            break;
      case OMAPFB_QUERY_PLANE:
            if ((r = omapfb_query_plane(fbi, &p.plane_info)) < 0)
                  break;
            if (copy_to_user((void __user *)arg, &p.plane_info,
                           sizeof(p.plane_info)))
                  r = -EFAULT;
            break;
      case OMAPFB_SETUP_MEM:
            if (copy_from_user(&p.mem_info, (void __user *)arg,
                           sizeof(p.mem_info)))
                  r = -EFAULT;
            else
                  r = omapfb_setup_mem(fbi, &p.mem_info);
            break;
      case OMAPFB_QUERY_MEM:
            if ((r = omapfb_query_mem(fbi, &p.mem_info)) < 0)
                  break;
            if (copy_to_user((void __user *)arg, &p.mem_info,
                           sizeof(p.mem_info)))
                  r = -EFAULT;
            break;
      case OMAPFB_SET_COLOR_KEY:
            if (copy_from_user(&p.color_key, (void __user *)arg,
                           sizeof(p.color_key)))
                  r = -EFAULT;
            else
                  r = omapfb_set_color_key(fbdev, &p.color_key);
            break;
      case OMAPFB_GET_COLOR_KEY:
            if ((r = omapfb_get_color_key(fbdev, &p.color_key)) < 0)
                  break;
            if (copy_to_user((void __user *)arg, &p.color_key,
                         sizeof(p.color_key)))
                  r = -EFAULT;
            break;
      case OMAPFB_GET_CAPS:
            omapfb_get_caps(fbdev, plane->idx, &p.caps);
            if (copy_to_user((void __user *)arg, &p.caps, sizeof(p.caps)))
                  r = -EFAULT;
            break;
      case OMAPFB_LCD_TEST:
            {
                  int test_num;

                  if (get_user(test_num, (int __user *)arg)) {
                        r = -EFAULT;
                        break;
                  }
                  if (!fbdev->panel->run_test) {
                        r = -EINVAL;
                        break;
                  }
                  r = fbdev->panel->run_test(fbdev->panel, test_num);
                  break;
            }
      case OMAPFB_CTRL_TEST:
            {
                  int test_num;

                  if (get_user(test_num, (int __user *)arg)) {
                        r = -EFAULT;
                        break;
                  }
                  if (!fbdev->ctrl->run_test) {
                        r = -EINVAL;
                        break;
                  }
                  r = fbdev->ctrl->run_test(test_num);
                  break;
            }
      default:
            r = -EINVAL;
      }

      return r;
}

static int omapfb_mmap(struct fb_info *info, struct vm_area_struct *vma)
{
      struct omapfb_plane_struct *plane = info->par;
      struct omapfb_device *fbdev = plane->fbdev;
      int r;

      omapfb_rqueue_lock(fbdev);
      r = fbdev->ctrl->mmap(info, vma);
      omapfb_rqueue_unlock(fbdev);

      return r;
}

/*
 * Callback table for the frame buffer framework. Some of these pointers
 * will be changed according to the current setting of fb_info->accel_flags.
 */
static struct fb_ops omapfb_ops = {
      .owner            = THIS_MODULE,
      .fb_open        = omapfb_open,
      .fb_release     = omapfb_release,
      .fb_setcolreg     = omapfb_setcolreg,
      .fb_setcmap = omapfb_setcmap,
      .fb_fillrect      = cfb_fillrect,
      .fb_copyarea      = cfb_copyarea,
      .fb_imageblit     = cfb_imageblit,
      .fb_blank       = omapfb_blank,
      .fb_ioctl   = omapfb_ioctl,
      .fb_check_var     = omapfb_check_var,
      .fb_set_par = omapfb_set_par,
      .fb_rotate  = omapfb_rotate,
      .fb_pan_display = omapfb_pan_display,
};

/*
 * ---------------------------------------------------------------------------
 * Sysfs interface
 * ---------------------------------------------------------------------------
 */
/* omapfbX sysfs entries */
static ssize_t omapfb_show_caps_num(struct device *dev,
                            struct device_attribute *attr, char *buf)
{
      struct omapfb_device *fbdev = (struct omapfb_device *)dev->driver_data;
      int plane;
      size_t size;
      struct omapfb_caps caps;

      plane = 0;
      size = 0;
      while (size < PAGE_SIZE && plane < OMAPFB_PLANE_NUM) {
            omapfb_get_caps(fbdev, plane, &caps);
            size += snprintf(&buf[size], PAGE_SIZE - size,
                  "plane#%d %#010x %#010x %#010x\n",
                  plane, caps.ctrl, caps.plane_color, caps.wnd_color);
            plane++;
      }
      return size;
}

static ssize_t omapfb_show_caps_text(struct device *dev,
                             struct device_attribute *attr, char *buf)
{
      struct omapfb_device *fbdev = (struct omapfb_device *)dev->driver_data;
      int i;
      struct omapfb_caps caps;
      int plane;
      size_t size;

      plane = 0;
      size = 0;
      while (size < PAGE_SIZE && plane < OMAPFB_PLANE_NUM) {
            omapfb_get_caps(fbdev, plane, &caps);
            size += snprintf(&buf[size], PAGE_SIZE - size,
                         "plane#%d:\n", plane);
            for (i = 0; i < ARRAY_SIZE(ctrl_caps) &&
                 size < PAGE_SIZE; i++) {
                  if (ctrl_caps[i].flag & caps.ctrl)
                        size += snprintf(&buf[size], PAGE_SIZE - size,
                              " %s\n", ctrl_caps[i].name);
            }
            size += snprintf(&buf[size], PAGE_SIZE - size,
                         " plane colors:\n");
            for (i = 0; i < ARRAY_SIZE(color_caps) &&
                 size < PAGE_SIZE; i++) {
                  if (color_caps[i].flag & caps.plane_color)
                        size += snprintf(&buf[size], PAGE_SIZE - size,
                              "  %s\n", color_caps[i].name);
            }
            size += snprintf(&buf[size], PAGE_SIZE - size,
                         " window colors:\n");
            for (i = 0; i < ARRAY_SIZE(color_caps) &&
                 size < PAGE_SIZE; i++) {
                  if (color_caps[i].flag & caps.wnd_color)
                        size += snprintf(&buf[size], PAGE_SIZE - size,
                              "  %s\n", color_caps[i].name);
            }

            plane++;
      }
      return size;
}

static DEVICE_ATTR(caps_num, 0444, omapfb_show_caps_num, NULL);
static DEVICE_ATTR(caps_text, 0444, omapfb_show_caps_text, NULL);

/* panel sysfs entries */
static ssize_t omapfb_show_panel_name(struct device *dev,
                              struct device_attribute *attr, char *buf)
{
      struct omapfb_device *fbdev = (struct omapfb_device *)dev->driver_data;

      return snprintf(buf, PAGE_SIZE, "%s\n", fbdev->panel->name);
}

static ssize_t omapfb_show_bklight_level(struct device *dev,
                               struct device_attribute *attr,
                               char *buf)
{
      struct omapfb_device *fbdev = (struct omapfb_device *)dev->driver_data;
      int r;

      if (fbdev->panel->get_bklight_level) {
            r = snprintf(buf, PAGE_SIZE, "%d\n",
                       fbdev->panel->get_bklight_level(fbdev->panel));
      } else
            r = -ENODEV;
      return r;
}

static ssize_t omapfb_store_bklight_level(struct device *dev,
                                struct device_attribute *attr,
                                const char *buf, size_t size)
{
      struct omapfb_device *fbdev = (struct omapfb_device *)dev->driver_data;
      int r;

      if (fbdev->panel->set_bklight_level) {
            unsigned int level;

            if (sscanf(buf, "%10d", &level) == 1) {
                  r = fbdev->panel->set_bklight_level(fbdev->panel,
                                              level);
            } else
                  r = -EINVAL;
      } else
            r = -ENODEV;
      return r ? r : size;
}

static ssize_t omapfb_show_bklight_max(struct device *dev,
                               struct device_attribute *attr, char *buf)
{
      struct omapfb_device *fbdev = (struct omapfb_device *)dev->driver_data;
      int r;

      if (fbdev->panel->get_bklight_level) {
            r = snprintf(buf, PAGE_SIZE, "%d\n",
                       fbdev->panel->get_bklight_max(fbdev->panel));
      } else
            r = -ENODEV;
      return r;
}

static struct device_attribute dev_attr_panel_name =
      __ATTR(name, 0444, omapfb_show_panel_name, NULL);
static DEVICE_ATTR(backlight_level, 0664,
               omapfb_show_bklight_level, omapfb_store_bklight_level);
static DEVICE_ATTR(backlight_max, 0444, omapfb_show_bklight_max, NULL);

static struct attribute *panel_attrs[] = {
      &dev_attr_panel_name.attr,
      &dev_attr_backlight_level.attr,
      &dev_attr_backlight_max.attr,
      NULL,
};

static struct attribute_group panel_attr_grp = {
      .name  = "panel",
      .attrs = panel_attrs,
};

/* ctrl sysfs entries */
static ssize_t omapfb_show_ctrl_name(struct device *dev,
                             struct device_attribute *attr, char *buf)
{
      struct omapfb_device *fbdev = (struct omapfb_device *)dev->driver_data;

      return snprintf(buf, PAGE_SIZE, "%s\n", fbdev->ctrl->name);
}

static struct device_attribute dev_attr_ctrl_name =
      __ATTR(name, 0444, omapfb_show_ctrl_name, NULL);

static struct attribute *ctrl_attrs[] = {
      &dev_attr_ctrl_name.attr,
      NULL,
};

static struct attribute_group ctrl_attr_grp = {
      .name  = "ctrl",
      .attrs = ctrl_attrs,
};

static int omapfb_register_sysfs(struct omapfb_device *fbdev)
{
      int r;

      if ((r = device_create_file(fbdev->dev, &dev_attr_caps_num)))
            goto fail0;

      if ((r = device_create_file(fbdev->dev, &dev_attr_caps_text)))
            goto fail1;

      if ((r = sysfs_create_group(&fbdev->dev->kobj, &panel_attr_grp)))
            goto fail2;

      if ((r = sysfs_create_group(&fbdev->dev->kobj, &ctrl_attr_grp)))
            goto fail3;

      return 0;
fail3:
      sysfs_remove_group(&fbdev->dev->kobj, &panel_attr_grp);
fail2:
      device_remove_file(fbdev->dev, &dev_attr_caps_text);
fail1:
      device_remove_file(fbdev->dev, &dev_attr_caps_num);
fail0:
      dev_err(fbdev->dev, "unable to register sysfs interface\n");
      return r;
}

static void omapfb_unregister_sysfs(struct omapfb_device *fbdev)
{
      sysfs_remove_group(&fbdev->dev->kobj, &ctrl_attr_grp);
      sysfs_remove_group(&fbdev->dev->kobj, &panel_attr_grp);
      device_remove_file(fbdev->dev, &dev_attr_caps_num);
      device_remove_file(fbdev->dev, &dev_attr_caps_text);
}

/*
 * ---------------------------------------------------------------------------
 * LDM callbacks
 * ---------------------------------------------------------------------------
 */
/* Initialize system fb_info object and set the default video mode.
 * The frame buffer memory already allocated by lcddma_init
 */
static int fbinfo_init(struct omapfb_device *fbdev, struct fb_info *info)
{
      struct fb_var_screeninfo      *var = &info->var;
      struct fb_fix_screeninfo      *fix = &info->fix;
      int                     r = 0;

      info->fbops = &omapfb_ops;
      info->flags = FBINFO_FLAG_DEFAULT;

      strncpy(fix->id, MODULE_NAME, sizeof(fix->id));

      info->pseudo_palette = fbdev->pseudo_palette;

      var->accel_flags  = def_accel ? FB_ACCELF_TEXT : 0;
      var->xres = def_vxres;
      var->yres = def_vyres;
      var->xres_virtual = def_vxres;
      var->yres_virtual = def_vyres;
      var->rotate   = def_rotate;
      var->bits_per_pixel = fbdev->panel->bpp;

      set_fb_var(info, var);
      set_fb_fix(info);

      r = fb_alloc_cmap(&info->cmap, 16, 0);
      if (r != 0)
            dev_err(fbdev->dev, "unable to allocate color map memory\n");

      return r;
}

/* Release the fb_info object */
static void fbinfo_cleanup(struct omapfb_device *fbdev, struct fb_info *fbi)
{
      fb_dealloc_cmap(&fbi->cmap);
}

static void planes_cleanup(struct omapfb_device *fbdev)
{
      int i;

      for (i = 0; i < fbdev->mem_desc.region_cnt; i++) {
            if (fbdev->fb_info[i] == NULL)
                  break;
            fbinfo_cleanup(fbdev, fbdev->fb_info[i]);
            framebuffer_release(fbdev->fb_info[i]);
      }
}

static int planes_init(struct omapfb_device *fbdev)
{
      struct fb_info *fbi;
      int i;
      int r;

      for (i = 0; i < fbdev->mem_desc.region_cnt; i++) {
            struct omapfb_plane_struct *plane;
            fbi = framebuffer_alloc(sizeof(struct omapfb_plane_struct),
                              fbdev->dev);
            if (fbi == NULL) {
                  dev_err(fbdev->dev,
                        "unable to allocate memory for plane info\n");
                  planes_cleanup(fbdev);
                  return -ENOMEM;
            }
            plane = fbi->par;
            plane->idx = i;
            plane->fbdev = fbdev;
            plane->info.mirror = def_mirror;
            fbdev->fb_info[i] = fbi;

            if ((r = fbinfo_init(fbdev, fbi)) < 0) {
                  framebuffer_release(fbi);
                  planes_cleanup(fbdev);
                  return r;
            }
            plane->info.out_width = fbi->var.xres;
            plane->info.out_height = fbi->var.yres;
      }
      return 0;
}

/*
 * Free driver resources. Can be called to rollback an aborted initialization
 * sequence.
 */
static void omapfb_free_resources(struct omapfb_device *fbdev, int state)
{
      int i;

      switch (state) {
      case OMAPFB_ACTIVE:
            for (i = 0; i < fbdev->mem_desc.region_cnt; i++)
                  unregister_framebuffer(fbdev->fb_info[i]);
      case 7:
            omapfb_unregister_sysfs(fbdev);
      case 6:
            fbdev->panel->disable(fbdev->panel);
      case 5:
            omapfb_set_update_mode(fbdev, OMAPFB_UPDATE_DISABLED);
      case 4:
            planes_cleanup(fbdev);
      case 3:
            ctrl_cleanup(fbdev);
      case 2:
            fbdev->panel->cleanup(fbdev->panel);
      case 1:
            dev_set_drvdata(fbdev->dev, NULL);
            kfree(fbdev);
      case 0:
            /* nothing to free */
            break;
      default:
            BUG();
      }
}

static int omapfb_find_ctrl(struct omapfb_device *fbdev)
{
      struct omapfb_platform_data *conf;
      char name[17];
      int i;

      conf = fbdev->dev->platform_data;

      fbdev->ctrl = NULL;

      strncpy(name, conf->lcd.ctrl_name, sizeof(name) - 1);
      name[sizeof(name) - 1] = '\0';

      if (strcmp(name, "internal") == 0) {
            fbdev->ctrl = fbdev->int_ctrl;
            return 0;
      }

      for (i = 0; i < ARRAY_SIZE(ctrls); i++) {
            dev_dbg(fbdev->dev, "ctrl %s\n", ctrls[i]->name);
            if (strcmp(ctrls[i]->name, name) == 0) {
                  fbdev->ctrl = ctrls[i];
                  break;
            }
      }

      if (fbdev->ctrl == NULL) {
            dev_dbg(fbdev->dev, "ctrl %s not supported\n", name);
            return -1;
      }

      return 0;
}

static void check_required_callbacks(struct omapfb_device *fbdev)
{
#define _C(x) (fbdev->ctrl->x != NULL)
#define _P(x) (fbdev->panel->x != NULL)
      BUG_ON(fbdev->ctrl == NULL || fbdev->panel == NULL);
      BUG_ON(!(_C(init) && _C(cleanup) && _C(get_caps) &&
             _C(set_update_mode) && _C(setup_plane) && _C(enable_plane) &&
             _P(init) && _P(cleanup) && _P(enable) && _P(disable) &&
             _P(get_caps)));
#undef _P
#undef _C
}

/*
 * Called by LDM binding to probe and attach a new device.
 * Initialization sequence:
 *   1. allocate system omapfb_device structure
 *   2. select controller type according to platform configuration
 *      init LCD panel
 *   3. init LCD controller and LCD DMA
 *   4. init system fb_info structure for all planes
 *   5. setup video mode for first plane and enable it
 *   6. enable LCD panel
 *   7. register sysfs attributes
 *   OMAPFB_ACTIVE: register system fb_info structure for all planes
 */
static int omapfb_do_probe(struct platform_device *pdev,
                        struct lcd_panel *panel)
{
      struct omapfb_device    *fbdev = NULL;
      int               init_state;
      unsigned long           phz, hhz, vhz;
      unsigned long           vram;
      int               i;
      int               r = 0;

      init_state = 0;

      if (pdev->num_resources != 0) {
            dev_err(&pdev->dev, "probed for an unknown device\n");
            r = -ENODEV;
            goto cleanup;
      }

      if (pdev->dev.platform_data == NULL) {
            dev_err(&pdev->dev, "missing platform data\n");
            r = -ENOENT;
            goto cleanup;
      }

      fbdev = kzalloc(sizeof(struct omapfb_device), GFP_KERNEL);
      if (fbdev == NULL) {
            dev_err(&pdev->dev,
                  "unable to allocate memory for device info\n");
            r = -ENOMEM;
            goto cleanup;
      }
      init_state++;

      fbdev->dev = &pdev->dev;
      fbdev->panel = panel;
      platform_set_drvdata(pdev, fbdev);

      mutex_init(&fbdev->rqueue_mutex);

#ifdef CONFIG_ARCH_OMAP1
      fbdev->int_ctrl = &omap1_int_ctrl;
#ifdef CONFIG_FB_OMAP_LCDC_EXTERNAL
      fbdev->ext_if = &omap1_ext_if;
#endif
#else /* OMAP2 */
      fbdev->int_ctrl = &omap2_int_ctrl;
#ifdef CONFIG_FB_OMAP_LCDC_EXTERNAL
      fbdev->ext_if = &omap2_ext_if;
#endif
#endif
      if (omapfb_find_ctrl(fbdev) < 0) {
            dev_err(fbdev->dev,
                  "LCD controller not found, board not supported\n");
            r = -ENODEV;
            goto cleanup;
      }

      r = fbdev->panel->init(fbdev->panel, fbdev);
      if (r)
            goto cleanup;

      pr_info("omapfb: configured for panel %s\n", fbdev->panel->name);

      def_vxres = def_vxres ? : fbdev->panel->x_res;
      def_vyres = def_vyres ? : fbdev->panel->y_res;

      init_state++;

      r = ctrl_init(fbdev);
      if (r)
            goto cleanup;
      if (fbdev->ctrl->mmap != NULL)
            omapfb_ops.fb_mmap = omapfb_mmap;
      init_state++;

      check_required_callbacks(fbdev);

      r = planes_init(fbdev);
      if (r)
            goto cleanup;
      init_state++;

#ifdef CONFIG_FB_OMAP_DMA_TUNE
      /* Set DMA priority for EMIFF access to highest */
      if (cpu_class_is_omap1())
            omap_set_dma_priority(0, OMAP_DMA_PORT_EMIFF, 15);
#endif

      r = ctrl_change_mode(fbdev->fb_info[0]);
      if (r) {
            dev_err(fbdev->dev, "mode setting failed\n");
            goto cleanup;
      }

      /* GFX plane is enabled by default */
      r = fbdev->ctrl->enable_plane(OMAPFB_PLANE_GFX, 1);
      if (r)
            goto cleanup;

      omapfb_set_update_mode(fbdev, manual_update ?
                           OMAPFB_MANUAL_UPDATE : OMAPFB_AUTO_UPDATE);
      init_state++;

      r = fbdev->panel->enable(fbdev->panel);
      if (r)
            goto cleanup;
      init_state++;

      r = omapfb_register_sysfs(fbdev);
      if (r)
            goto cleanup;
      init_state++;

      vram = 0;
      for (i = 0; i < fbdev->mem_desc.region_cnt; i++) {
            r = register_framebuffer(fbdev->fb_info[i]);
            if (r != 0) {
                  dev_err(fbdev->dev,
                        "registering framebuffer %d failed\n", i);
                  goto cleanup;
            }
            vram += fbdev->mem_desc.region[i].size;
      }

      fbdev->state = OMAPFB_ACTIVE;

      panel = fbdev->panel;
      phz = panel->pixel_clock * 1000;
      hhz = phz * 10 / (panel->hfp + panel->x_res + panel->hbp + panel->hsw);
      vhz = hhz / (panel->vfp + panel->y_res + panel->vbp + panel->vsw);

      omapfb_dev = fbdev;

      pr_info("omapfb: Framebuffer initialized. Total vram %lu planes %d\n",
                  vram, fbdev->mem_desc.region_cnt);
      pr_info("omapfb: Pixclock %lu kHz hfreq %lu.%lu kHz "
                  "vfreq %lu.%lu Hz\n",
                  phz / 1000, hhz / 10000, hhz % 10, vhz / 10, vhz % 10);

      return 0;

cleanup:
      omapfb_free_resources(fbdev, init_state);

      return r;
}

static int omapfb_probe(struct platform_device *pdev)
{
      BUG_ON(fbdev_pdev != NULL);

      /* Delay actual initialization until the LCD is registered */
      fbdev_pdev = pdev;
      if (fbdev_panel != NULL)
            omapfb_do_probe(fbdev_pdev, fbdev_panel);
      return 0;
}

void omapfb_register_panel(struct lcd_panel *panel)
{
      BUG_ON(fbdev_panel != NULL);

      fbdev_panel = panel;
      if (fbdev_pdev != NULL)
            omapfb_do_probe(fbdev_pdev, fbdev_panel);
}

/* Called when the device is being detached from the driver */
static int omapfb_remove(struct platform_device *pdev)
{
      struct omapfb_device *fbdev = platform_get_drvdata(pdev);
      enum omapfb_state saved_state = fbdev->state;

      /* FIXME: wait till completion of pending events */

      fbdev->state = OMAPFB_DISABLED;
      omapfb_free_resources(fbdev, saved_state);

      return 0;
}

/* PM suspend */
static int omapfb_suspend(struct platform_device *pdev, pm_message_t mesg)
{
      struct omapfb_device *fbdev = platform_get_drvdata(pdev);

      omapfb_blank(VESA_POWERDOWN, fbdev->fb_info[0]);

      return 0;
}

/* PM resume */
static int omapfb_resume(struct platform_device *pdev)
{
      struct omapfb_device *fbdev = platform_get_drvdata(pdev);

      omapfb_blank(VESA_NO_BLANKING, fbdev->fb_info[0]);
      return 0;
}

static struct platform_driver omapfb_driver = {
      .probe            = omapfb_probe,
      .remove           = omapfb_remove,
      .suspend    = omapfb_suspend,
      .resume           = omapfb_resume,
      .driver           = {
            .name = MODULE_NAME,
            .owner      = THIS_MODULE,
      },
};

#ifndef MODULE

/* Process kernel command line parameters */
static int __init omapfb_setup(char *options)
{
      char *this_opt = NULL;
      int r = 0;

      pr_debug("omapfb: options %s\n", options);

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

      while (!r && (this_opt = strsep(&options, ",")) != NULL) {
            if (!strncmp(this_opt, "accel", 5))
                  def_accel = 1;
            else if (!strncmp(this_opt, "vram:", 5)) {
                  char *suffix;
                  unsigned long vram;
                  vram = (simple_strtoul(this_opt + 5, &suffix, 0));
                  switch (suffix[0]) {
                  case '\0':
                        break;
                  case 'm':
                  case 'M':
                        vram *= 1024;
                        /* Fall through */
                  case 'k':
                  case 'K':
                        vram *= 1024;
                        break;
                  default:
                        pr_debug("omapfb: invalid vram suffix %c\n",
                               suffix[0]);
                        r = -1;
                  }
                  def_vram[def_vram_cnt++] = vram;
            }
            else if (!strncmp(this_opt, "vxres:", 6))
                  def_vxres = simple_strtoul(this_opt + 6, NULL, 0);
            else if (!strncmp(this_opt, "vyres:", 6))
                  def_vyres = simple_strtoul(this_opt + 6, NULL, 0);
            else if (!strncmp(this_opt, "rotate:", 7))
                  def_rotate = (simple_strtoul(this_opt + 7, NULL, 0));
            else if (!strncmp(this_opt, "mirror:", 7))
                  def_mirror = (simple_strtoul(this_opt + 7, NULL, 0));
            else if (!strncmp(this_opt, "manual_update", 13))
                  manual_update = 1;
            else {
                  pr_debug("omapfb: invalid option\n");
                  r = -1;
            }
      }

      return r;
}

#endif

/* Register both the driver and the device */
static int __init omapfb_init(void)
{
#ifndef MODULE
      char *option;

      if (fb_get_options("omapfb", &option))
            return -ENODEV;
      omapfb_setup(option);
#endif
      /* Register the driver with LDM */
      if (platform_driver_register(&omapfb_driver)) {
            pr_debug("failed to register omapfb driver\n");
            return -ENODEV;
      }

      return 0;
}

static void __exit omapfb_cleanup(void)
{
      platform_driver_unregister(&omapfb_driver);
}

module_param_named(accel, def_accel, uint, 0664);
module_param_array_named(vram, def_vram, ulong, &def_vram_cnt, 0664);
module_param_named(vxres, def_vxres, long, 0664);
module_param_named(vyres, def_vyres, long, 0664);
module_param_named(rotate, def_rotate, uint, 0664);
module_param_named(mirror, def_mirror, uint, 0664);
module_param_named(manual_update, manual_update, bool, 0664);

module_init(omapfb_init);
module_exit(omapfb_cleanup);

MODULE_DESCRIPTION("TI OMAP framebuffer driver");
MODULE_AUTHOR("Imre Deak <imre.deak@nokia.com>");
MODULE_LICENSE("GPL");

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