omapfb_main.c

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/*
 * Framebuffer driver for TI OMAP boards
 *
 * Copyright (C) 2004 Nokia Corporation
 * Author: Imre Deak <[email protected]>
 *
 * Acknowledgements:
 *   Alex McMains <[email protected]>       - Original driver
 *   Juha Yrjola <[email protected]>   - Original driver and improvements
 *   Dirk Behme <[email protected]>  - 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/mm.h>
#include <linux/slab.h>
#include <linux/uaccess.h>
#include <linux/module.h>

#include <plat/dma.h>

#include "omapfb.h"
#include "lcdc.h"

#define MODULE_NAME "omapfb"

static unsigned int def_accel;
static unsigned long    def_vram[OMAPFB_PLANE_NUM];
static unsigned 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 bool     manual_update = 1;
#else
static bool     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_WINDOW_ROTATE,  "rotate 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", },
};

static void omapdss_release(struct device *dev)
{
}

/* dummy device for clocks */
static struct platform_device omapdss_device = {
    .name       = "omapdss_dss",
    .id     = -1,
    .dev            = {
        .release = omapdss_release,
    },
};

/*
 * ---------------------------------------------------------------------------
 * LCD panel
 * ---------------------------------------------------------------------------
 */
extern struct lcd_ctrl hwa742_ctrl;

static const struct lcd_ctrl *ctrls[] = {
    &omap1_int_ctrl,

#ifdef CONFIG_FB_OMAP_LCDC_HWA742
    &hwa742_ctrl,
#endif
};

#ifdef CONFIG_FB_OMAP_LCDC_EXTERNAL
extern struct lcd_ctrl_extif omap1_ext_if;
#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
 * ---------------------------------------------------------------------------
 */
/*
 * 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;
    }

    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 (r < 0)
        return r;

    if (fbdev->ctrl->set_rotate != NULL) {
        r = fbdev->ctrl->set_rotate(var->rotate);
        if (r < 0)
            return r;
    }

    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 FB_BLANK_UNBLANK:
        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 FB_BLANK_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, int from_init)
{
    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    = rg->vaddr;

    if (!from_init) {
        mutex_lock(&fbi->mm_lock);
        fix->smem_start     = rg->paddr;
        fix->smem_len       = rg->size;
        mutex_unlock(&fbi->mm_lock);
    } else {
        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;
    case 16:
        if (plane->fbdev->panel->bpp == 12)
            plane->color_mode = OMAPFB_COLOR_RGB444;
        else
            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;

    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 (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, 0);
    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)
{
    int xres, yres;
    struct omapfb_plane_struct *plane = fbi->par;
    struct omapfb_device *fbdev = plane->fbdev;
    struct fb_var_screeninfo *var = &fbi->var;

    switch (var->rotate) {
    case 0:
    case 180:
        xres = fbdev->panel->x_res;
        yres = fbdev->panel->y_res;
        break;
    case 90:
    case 270:
        xres = fbdev->panel->y_res;
        yres = fbdev->panel->x_res;
        break;
    default:
        return -EINVAL;
    }

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

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

    if (win->x + win->width > xres)
        win->width = xres - win->x;
    if (win->y + win->height > yres)
        win->height = yres - win->y;
    if (win->out_x + win->out_width > xres)
        win->out_width = xres - win->out_x;
    if (win->out_y + win->out_height > yres)
        win->out_height = yres - 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, NULL);
    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, NULL);
    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_SDRAM)
        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, 0);
            } else {
                /*
                 * Set these explicitly to indicate that the
                 * plane memory is dealloce'd, the other
                 * screen parameters in var / fix are invalid.
                 */
                mutex_lock(&fbi->mm_lock);
                fbi->fix.smem_start = 0;
                fbi->fix.smem_len = 0;
                mutex_unlock(&fbi->mm_lock);
            }
        }
    }
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, NULL);
    }
    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 = dev_get_drvdata(dev);
    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 = dev_get_drvdata(dev);
    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 = dev_get_drvdata(dev);

    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 = dev_get_drvdata(dev);
    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 = dev_get_drvdata(dev);
    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 = dev_get_drvdata(dev);
    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 = dev_get_drvdata(dev);

    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, 1);

    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;
    fbdev->dssdev = &omapdss_device;
    platform_set_drvdata(pdev, fbdev);

    mutex_init(&fbdev->rqueue_mutex);

    fbdev->int_ctrl = &omap1_int_ctrl;
#ifdef CONFIG_FB_OMAP_LCDC_EXTERNAL
    fbdev->ext_if = &omap1_ext_if;
#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 ? def_vxres : fbdev->panel->x_res;
    def_vyres = 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 */
    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)
{
    int r;

    BUG_ON(fbdev_pdev != NULL);

    r = platform_device_register(&omapdss_device);
    if (r) {
        dev_err(&pdev->dev, "can't register omapdss device\n");
        return r;
    }

    /* 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);

    platform_device_unregister(&omapdss_device);
    fbdev->dssdev = NULL;

    return 0;
}

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

    if (fbdev != NULL)
        omapfb_blank(FB_BLANK_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);

    if (fbdev != NULL)
        omapfb_blank(FB_BLANK_UNBLANK, 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 <[email protected]>");
MODULE_LICENSE("GPL");