/*
 *  linux/drivers/video/console/fbcon.h -- Low level frame buffer based console driver
 *
 *      Copyright (C) 1997 Geert Uytterhoeven
 *
 *  This file is subject to the terms and conditions of the GNU General Public
 *  License.  See the file COPYING in the main directory of this archive
 *  for more details.
 */

#ifndef _VIDEO_FBCON_H
#define _VIDEO_FBCON_H

#include <linux/compiler_types.h>
#include <linux/font.h>
#include <linux/types.h>
#include <linux/vt_buffer.h>
#include <linux/vt_kern.h>
#include <linux/workqueue.h>

#include <asm/io.h>

struct fb_blit_caps;
struct fb_info;
struct fb_var_screeninfo;
struct fb_videomode;

   /*
    *    This is the interface between the low-level console driver and the
    *    low-level frame buffer device
    */

struct fbcon_display {
    /* Filled in by the low-level console driver */
    font_data_t *fontdata;
#ifdef CONFIG_FRAMEBUFFER_CONSOLE_LEGACY_ACCELERATION
    u_short scrollmode;             /* Scroll Method, use fb_scrollmode() */
#endif
    short yscroll;                  /* Hardware scrolling */
    int vrows;                      /* number of virtual rows */
    int cursor_shape;
    int con_rotate;
    u32 xres_virtual;
    u32 yres_virtual;
    u32 height;
    u32 width;
    u32 bits_per_pixel;
    u32 grayscale;
    u32 nonstd;
    u32 accel_flags;
    u32 rotate;
    struct fb_bitfield red;
    struct fb_bitfield green;
    struct fb_bitfield blue;
    struct fb_bitfield transp;
    const struct fb_videomode *mode;
};

struct fbcon_bitops {
        void (*bmove)(struct vc_data *vc, struct fb_info *info, int sy,
                      int sx, int dy, int dx, int height, int width);
        void (*clear)(struct vc_data *vc, struct fb_info *info, int sy,
                      int sx, int height, int width, int fb, int bg);
        void (*putcs)(struct vc_data *vc, struct fb_info *info,
                      const unsigned short *s, int count, int yy, int xx,
                      int fg, int bg);
        void (*clear_margins)(struct vc_data *vc, struct fb_info *info,
                              int color, int bottom_only);
        void (*cursor)(struct vc_data *vc, struct fb_info *info,
                       bool enable, int fg, int bg);
        int  (*update_start)(struct fb_info *info);
        int  (*rotate_font)(struct fb_info *info, struct vc_data *vc);
};

struct fbcon_par {
        struct fb_var_screeninfo var;  /* copy of the current fb_var_screeninfo */
        struct delayed_work cursor_work; /* Cursor timer */
        struct fb_cursor cursor_state;
        struct fbcon_display *p;
        struct fb_info *info;
        int    currcon;                 /* Current VC. */
        int    cur_blink_jiffies;
        int    cursor_flash;
        int    cursor_reset;
        int    blank_state;
        int    graphics;
        bool   initialized;
        int    rotate;
        char  *cursor_data;
#ifdef CONFIG_FRAMEBUFFER_CONSOLE_ROTATION
        struct {
                font_data_t *fontdata;  /* source font */
                u8 *buf;                /* rotated glyphs */
                size_t bufsize;
                int buf_rotate;         /* rotation of buf */
        } rotated;
#endif
        u8    *cursor_src;
        u32    cursor_size;

        const struct fbcon_bitops *bitops;
};

    /*
     *  Attribute Decoding
     */

/* Color */
#define attr_fgcol(fgshift,s)    \
        (((s) >> (fgshift)) & 0x0f)
#define attr_bgcol(bgshift,s)    \
        (((s) >> (bgshift)) & 0x0f)

/* Monochrome */
#define attr_bold(s) \
        ((s) & 0x200)
#define attr_reverse(s) \
        ((s) & 0x800)
#define attr_underline(s) \
        ((s) & 0x400)
#define attr_blink(s) \
        ((s) & 0x8000)

static inline int mono_col(const struct fb_info *info)
{
        __u32 max_len;
        max_len = max(info->var.green.length, info->var.red.length);
        max_len = max(info->var.blue.length, max_len);
        return (~(0xfff << max_len)) & 0xff;
}

    /*
     *  Scroll Method
     */

/* There are several methods fbcon can use to move text around the screen:
 *
 *                     Operation   Pan    Wrap
 *---------------------------------------------
 * SCROLL_MOVE         copyarea    No     No
 * SCROLL_PAN_MOVE     copyarea    Yes    No
 * SCROLL_WRAP_MOVE    copyarea    No     Yes
 * SCROLL_REDRAW       imageblit   No     No
 * SCROLL_PAN_REDRAW   imageblit   Yes    No
 * SCROLL_WRAP_REDRAW  imageblit   No     Yes
 *
 * (SCROLL_WRAP_REDRAW is not implemented yet)
 *
 * In general, fbcon will choose the best scrolling
 * method based on the rule below:
 *
 * Pan/Wrap > accel imageblit > accel copyarea >
 * soft imageblit > (soft copyarea)
 *
 * Exception to the rule: Pan + accel copyarea is
 * preferred over Pan + accel imageblit.
 *
 * The above is typical for PCI/AGP cards. Unless
 * overridden, fbcon will never use soft copyarea.
 *
 * If you need to override the above rule, set the
 * appropriate flags in fb_info->flags.  For example,
 * to prefer copyarea over imageblit, set
 * FBINFO_READS_FAST.
 *
 * Other notes:
 * + use the hardware engine to move the text
 *    (hw-accelerated copyarea() and fillrect())
 * + use hardware-supported panning on a large virtual screen
 * + amifb can not only pan, but also wrap the display by N lines
 *    (i.e. visible line i = physical line (i+N) % yres).
 * + read what's already rendered on the screen and
 *     write it in a different place (this is cfb_copyarea())
 * + re-render the text to the screen
 *
 * Whether to use wrapping or panning can only be figured out at
 * runtime (when we know whether our font height is a multiple
 * of the pan/wrap step)
 *
 */

#define SCROLL_MOVE        0x001
#define SCROLL_PAN_MOVE    0x002
#define SCROLL_WRAP_MOVE   0x003
#define SCROLL_REDRAW      0x004
#define SCROLL_PAN_REDRAW  0x005

static inline u_short fb_scrollmode(struct fbcon_display *fb)
{
#ifdef CONFIG_FRAMEBUFFER_CONSOLE_LEGACY_ACCELERATION
        return fb->scrollmode;
#else
        /* hardcoded to SCROLL_REDRAW if acceleration was disabled. */
        return SCROLL_REDRAW;
#endif
}


#ifdef CONFIG_FB_TILEBLITTING
extern void fbcon_set_tileops(struct vc_data *vc, struct fb_info *info);
#endif
extern void fbcon_set_bitops_ur(struct fbcon_par *par);
extern int  soft_cursor(struct fb_info *info, struct fb_cursor *cursor);

void fbcon_fill_cursor_mask(struct fbcon_par *par, struct vc_data *vc, unsigned char *mask);

#define FBCON_ATTRIBUTE_UNDERLINE 1
#define FBCON_ATTRIBUTE_REVERSE   2
#define FBCON_ATTRIBUTE_BOLD      4

static inline int real_y(struct fbcon_display *p, int ypos)
{
        int rows = p->vrows;

        ypos += p->yscroll;
        return ypos < rows ? ypos : ypos - rows;
}


static inline int get_attribute(struct fb_info *info, u16 c)
{
        int attribute = 0;

        if (fb_get_color_depth(&info->var, &info->fix) == 1) {
                if (attr_underline(c))
                        attribute |= FBCON_ATTRIBUTE_UNDERLINE;
                if (attr_reverse(c))
                        attribute |= FBCON_ATTRIBUTE_REVERSE;
                if (attr_bold(c))
                        attribute |= FBCON_ATTRIBUTE_BOLD;
        }

        return attribute;
}

#define FBCON_SWAP(i,r,v) ({ \
        typeof(r) _r = (r);  \
        typeof(v) _v = (v);  \
        (void) (&_r == &_v); \
        (i == FB_ROTATE_UR || i == FB_ROTATE_UD) ? _r : _v; })

#ifdef CONFIG_FRAMEBUFFER_CONSOLE
void __init fb_console_init(void);
void __exit fb_console_exit(void);
int fbcon_fb_registered(struct fb_info *info);
void fbcon_fb_unregistered(struct fb_info *info);
void fbcon_fb_unbind(struct fb_info *info);
void fbcon_suspended(struct fb_info *info);
void fbcon_resumed(struct fb_info *info);
int fbcon_mode_deleted(struct fb_info *info,
                       struct fb_videomode *mode);
void fbcon_delete_modelist(struct list_head *head);
void fbcon_new_modelist(struct fb_info *info);
void fbcon_get_requirement(struct fb_info *info,
                           struct fb_blit_caps *caps);
void fbcon_fb_blanked(struct fb_info *info, int blank);
int  fbcon_modechange_possible(struct fb_info *info,
                               struct fb_var_screeninfo *var);
void fbcon_update_vcs(struct fb_info *info, bool all);
void fbcon_remap_all(struct fb_info *info);
int fbcon_set_con2fb_map_ioctl(void __user *argp);
int fbcon_get_con2fb_map_ioctl(void __user *argp);
#else
static inline void fb_console_init(void) {}
static inline void fb_console_exit(void) {}
static inline int fbcon_fb_registered(struct fb_info *info) { return 0; }
static inline void fbcon_fb_unregistered(struct fb_info *info) {}
static inline void fbcon_fb_unbind(struct fb_info *info) {}
static inline void fbcon_suspended(struct fb_info *info) {}
static inline void fbcon_resumed(struct fb_info *info) {}
static inline int fbcon_mode_deleted(struct fb_info *info,
                                     struct fb_videomode *mode) { return 0; }
static inline void fbcon_delete_modelist(struct list_head *head) {}
static inline void fbcon_new_modelist(struct fb_info *info) {}
static inline void fbcon_get_requirement(struct fb_info *info,
                                         struct fb_blit_caps *caps) {}
static inline void fbcon_fb_blanked(struct fb_info *info, int blank) {}
static inline int  fbcon_modechange_possible(struct fb_info *info,
                                struct fb_var_screeninfo *var) { return 0; }
static inline void fbcon_update_vcs(struct fb_info *info, bool all) {}
static inline void fbcon_remap_all(struct fb_info *info) {}
static inline int fbcon_set_con2fb_map_ioctl(void __user *argp) { return 0; }
static inline int fbcon_get_con2fb_map_ioctl(void __user *argp) { return 0; }
#endif

#endif /* _VIDEO_FBCON_H */