linux/drivers/video/console/fbcon_ccw.c
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   1/*
   2 *  linux/drivers/video/console/fbcon_ccw.c -- Software Rotation - 270 degrees
   3 *
   4 *      Copyright (C) 2005 Antonino Daplas <adaplas @pol.net>
   5 *
   6 *  This file is subject to the terms and conditions of the GNU General Public
   7 *  License.  See the file COPYING in the main directory of this archive for
   8 *  more details.
   9 */
  10
  11#include <linux/module.h>
  12#include <linux/string.h>
  13#include <linux/fb.h>
  14#include <linux/vt_kern.h>
  15#include <linux/console.h>
  16#include <asm/types.h>
  17#include "fbcon.h"
  18#include "fbcon_rotate.h"
  19
  20/*
  21 * Rotation 270 degrees
  22 */
  23
  24static inline void ccw_update_attr(u8 *dst, u8 *src, int attribute,
  25                                  struct vc_data *vc)
  26{
  27        int i, j, offset = (vc->vc_font.height < 10) ? 1 : 2;
  28        int width = (vc->vc_font.height + 7) >> 3;
  29        int mod = vc->vc_font.height % 8;
  30        u8 c, msk = ~(0xff << offset), msk1 = 0;
  31
  32        if (mod)
  33                msk <<= (8 - mod);
  34
  35        if (offset > mod)
  36                msk1 |= 0x01;
  37
  38        for (i = 0; i < vc->vc_font.width; i++) {
  39                for (j = 0; j < width; j++) {
  40                        c = *src;
  41
  42                        if (attribute & FBCON_ATTRIBUTE_UNDERLINE) {
  43                                if (j == width - 1)
  44                                        c |= msk;
  45
  46                                if (msk1 && j == width - 2)
  47                                        c |= msk1;
  48                        }
  49
  50                        if (attribute & FBCON_ATTRIBUTE_BOLD && i)
  51                                *(dst - width) |= c;
  52
  53                        if (attribute & FBCON_ATTRIBUTE_REVERSE)
  54                                c = ~c;
  55                        src++;
  56                        *dst++ = c;
  57                }
  58        }
  59}
  60
  61
  62static void ccw_bmove(struct vc_data *vc, struct fb_info *info, int sy,
  63                     int sx, int dy, int dx, int height, int width)
  64{
  65        struct fbcon_ops *ops = info->fbcon_par;
  66        struct fb_copyarea area;
  67        u32 vyres = GETVYRES(ops->p->scrollmode, info);
  68
  69        area.sx = sy * vc->vc_font.height;
  70        area.sy = vyres - ((sx + width) * vc->vc_font.width);
  71        area.dx = dy * vc->vc_font.height;
  72        area.dy = vyres - ((dx + width) * vc->vc_font.width);
  73        area.width = height * vc->vc_font.height;
  74        area.height  = width * vc->vc_font.width;
  75
  76        info->fbops->fb_copyarea(info, &area);
  77}
  78
  79static void ccw_clear(struct vc_data *vc, struct fb_info *info, int sy,
  80                     int sx, int height, int width)
  81{
  82        struct fbcon_ops *ops = info->fbcon_par;
  83        struct fb_fillrect region;
  84        int bgshift = (vc->vc_hi_font_mask) ? 13 : 12;
  85        u32 vyres = GETVYRES(ops->p->scrollmode, info);
  86
  87        region.color = attr_bgcol_ec(bgshift,vc);
  88        region.dx = sy * vc->vc_font.height;
  89        region.dy = vyres - ((sx + width) * vc->vc_font.width);
  90        region.height = width * vc->vc_font.width;
  91        region.width = height * vc->vc_font.height;
  92        region.rop = ROP_COPY;
  93
  94        info->fbops->fb_fillrect(info, &region);
  95}
  96
  97static inline void ccw_putcs_aligned(struct vc_data *vc, struct fb_info *info,
  98                                    const u16 *s, u32 attr, u32 cnt,
  99                                    u32 d_pitch, u32 s_pitch, u32 cellsize,
 100                                    struct fb_image *image, u8 *buf, u8 *dst)
 101{
 102        struct fbcon_ops *ops = info->fbcon_par;
 103        u16 charmask = vc->vc_hi_font_mask ? 0x1ff : 0xff;
 104        u32 idx = (vc->vc_font.height + 7) >> 3;
 105        u8 *src;
 106
 107        while (cnt--) {
 108                src = ops->fontbuffer + (scr_readw(s--) & charmask)*cellsize;
 109
 110                if (attr) {
 111                        ccw_update_attr(buf, src, attr, vc);
 112                        src = buf;
 113                }
 114
 115                if (likely(idx == 1))
 116                        __fb_pad_aligned_buffer(dst, d_pitch, src, idx,
 117                                                vc->vc_font.width);
 118                else
 119                        fb_pad_aligned_buffer(dst, d_pitch, src, idx,
 120                                              vc->vc_font.width);
 121
 122                dst += d_pitch * vc->vc_font.width;
 123        }
 124
 125        info->fbops->fb_imageblit(info, image);
 126}
 127
 128static void ccw_putcs(struct vc_data *vc, struct fb_info *info,
 129                      const unsigned short *s, int count, int yy, int xx,
 130                      int fg, int bg)
 131{
 132        struct fb_image image;
 133        struct fbcon_ops *ops = info->fbcon_par;
 134        u32 width = (vc->vc_font.height + 7)/8;
 135        u32 cellsize = width * vc->vc_font.width;
 136        u32 maxcnt = info->pixmap.size/cellsize;
 137        u32 scan_align = info->pixmap.scan_align - 1;
 138        u32 buf_align = info->pixmap.buf_align - 1;
 139        u32 cnt, pitch, size;
 140        u32 attribute = get_attribute(info, scr_readw(s));
 141        u8 *dst, *buf = NULL;
 142        u32 vyres = GETVYRES(ops->p->scrollmode, info);
 143
 144        if (!ops->fontbuffer)
 145                return;
 146
 147        image.fg_color = fg;
 148        image.bg_color = bg;
 149        image.dx = yy * vc->vc_font.height;
 150        image.dy = vyres - ((xx + count) * vc->vc_font.width);
 151        image.width = vc->vc_font.height;
 152        image.depth = 1;
 153
 154        if (attribute) {
 155                buf = kmalloc(cellsize, GFP_KERNEL);
 156                if (!buf)
 157                        return;
 158        }
 159
 160        s += count - 1;
 161
 162        while (count) {
 163                if (count > maxcnt)
 164                        cnt = maxcnt;
 165                else
 166                        cnt = count;
 167
 168                image.height = vc->vc_font.width * cnt;
 169                pitch = ((image.width + 7) >> 3) + scan_align;
 170                pitch &= ~scan_align;
 171                size = pitch * image.height + buf_align;
 172                size &= ~buf_align;
 173                dst = fb_get_buffer_offset(info, &info->pixmap, size);
 174                image.data = dst;
 175                ccw_putcs_aligned(vc, info, s, attribute, cnt, pitch,
 176                                 width, cellsize, &image, buf, dst);
 177                image.dy += image.height;
 178                count -= cnt;
 179                s -= cnt;
 180        }
 181
 182        /* buf is always NULL except when in monochrome mode, so in this case
 183           it's a gain to check buf against NULL even though kfree() handles
 184           NULL pointers just fine */
 185        if (unlikely(buf))
 186                kfree(buf);
 187
 188}
 189
 190static void ccw_clear_margins(struct vc_data *vc, struct fb_info *info,
 191                             int bottom_only)
 192{
 193        unsigned int cw = vc->vc_font.width;
 194        unsigned int ch = vc->vc_font.height;
 195        unsigned int rw = info->var.yres - (vc->vc_cols*cw);
 196        unsigned int bh = info->var.xres - (vc->vc_rows*ch);
 197        unsigned int bs = vc->vc_rows*ch;
 198        struct fb_fillrect region;
 199        int bgshift = (vc->vc_hi_font_mask) ? 13 : 12;
 200
 201        region.color = attr_bgcol_ec(bgshift,vc);
 202        region.rop = ROP_COPY;
 203
 204        if (rw && !bottom_only) {
 205                region.dx = 0;
 206                region.dy = info->var.yoffset;
 207                region.height = rw;
 208                region.width = info->var.xres_virtual;
 209                info->fbops->fb_fillrect(info, &region);
 210        }
 211
 212        if (bh) {
 213                region.dx = info->var.xoffset + bs;
 214                region.dy = 0;
 215                region.height = info->var.yres_virtual;
 216                region.width = bh;
 217                info->fbops->fb_fillrect(info, &region);
 218        }
 219}
 220
 221static void ccw_cursor(struct vc_data *vc, struct fb_info *info, int mode,
 222                       int softback_lines, int fg, int bg)
 223{
 224        struct fb_cursor cursor;
 225        struct fbcon_ops *ops = info->fbcon_par;
 226        unsigned short charmask = vc->vc_hi_font_mask ? 0x1ff : 0xff;
 227        int w = (vc->vc_font.height + 7) >> 3, c;
 228        int y = real_y(ops->p, vc->vc_y);
 229        int attribute, use_sw = (vc->vc_cursor_type & 0x10);
 230        int err = 1, dx, dy;
 231        char *src;
 232        u32 vyres = GETVYRES(ops->p->scrollmode, info);
 233
 234        if (!ops->fontbuffer)
 235                return;
 236
 237        cursor.set = 0;
 238
 239        if (softback_lines) {
 240                if (y + softback_lines >= vc->vc_rows) {
 241                        mode = CM_ERASE;
 242                        ops->cursor_flash = 0;
 243                        return;
 244                } else
 245                        y += softback_lines;
 246        }
 247
 248        c = scr_readw((u16 *) vc->vc_pos);
 249        attribute = get_attribute(info, c);
 250        src = ops->fontbuffer + ((c & charmask) * (w * vc->vc_font.width));
 251
 252        if (ops->cursor_state.image.data != src ||
 253            ops->cursor_reset) {
 254            ops->cursor_state.image.data = src;
 255            cursor.set |= FB_CUR_SETIMAGE;
 256        }
 257
 258        if (attribute) {
 259                u8 *dst;
 260
 261                dst = kmalloc(w * vc->vc_font.width, GFP_ATOMIC);
 262                if (!dst)
 263                        return;
 264                kfree(ops->cursor_data);
 265                ops->cursor_data = dst;
 266                ccw_update_attr(dst, src, attribute, vc);
 267                src = dst;
 268        }
 269
 270        if (ops->cursor_state.image.fg_color != fg ||
 271            ops->cursor_state.image.bg_color != bg ||
 272            ops->cursor_reset) {
 273                ops->cursor_state.image.fg_color = fg;
 274                ops->cursor_state.image.bg_color = bg;
 275                cursor.set |= FB_CUR_SETCMAP;
 276        }
 277
 278        if (ops->cursor_state.image.height != vc->vc_font.width ||
 279            ops->cursor_state.image.width != vc->vc_font.height ||
 280            ops->cursor_reset) {
 281                ops->cursor_state.image.height = vc->vc_font.width;
 282                ops->cursor_state.image.width = vc->vc_font.height;
 283                cursor.set |= FB_CUR_SETSIZE;
 284        }
 285
 286        dx = y * vc->vc_font.height;
 287        dy = vyres - ((vc->vc_x + 1) * vc->vc_font.width);
 288
 289        if (ops->cursor_state.image.dx != dx ||
 290            ops->cursor_state.image.dy != dy ||
 291            ops->cursor_reset) {
 292                ops->cursor_state.image.dx = dx;
 293                ops->cursor_state.image.dy = dy;
 294                cursor.set |= FB_CUR_SETPOS;
 295        }
 296
 297        if (ops->cursor_state.hot.x || ops->cursor_state.hot.y ||
 298            ops->cursor_reset) {
 299                ops->cursor_state.hot.x = cursor.hot.y = 0;
 300                cursor.set |= FB_CUR_SETHOT;
 301        }
 302
 303        if (cursor.set & FB_CUR_SETSIZE ||
 304            vc->vc_cursor_type != ops->p->cursor_shape ||
 305            ops->cursor_state.mask == NULL ||
 306            ops->cursor_reset) {
 307                char *tmp, *mask = kmalloc(w*vc->vc_font.width, GFP_ATOMIC);
 308                int cur_height, size, i = 0;
 309                int width = (vc->vc_font.width + 7)/8;
 310
 311                if (!mask)
 312                        return;
 313
 314                tmp = kmalloc(width * vc->vc_font.height, GFP_ATOMIC);
 315
 316                if (!tmp) {
 317                        kfree(mask);
 318                        return;
 319                }
 320
 321                kfree(ops->cursor_state.mask);
 322                ops->cursor_state.mask = mask;
 323
 324                ops->p->cursor_shape = vc->vc_cursor_type;
 325                cursor.set |= FB_CUR_SETSHAPE;
 326
 327                switch (ops->p->cursor_shape & CUR_HWMASK) {
 328                case CUR_NONE:
 329                        cur_height = 0;
 330                        break;
 331                case CUR_UNDERLINE:
 332                        cur_height = (vc->vc_font.height < 10) ? 1 : 2;
 333                        break;
 334                case CUR_LOWER_THIRD:
 335                        cur_height = vc->vc_font.height/3;
 336                        break;
 337                case CUR_LOWER_HALF:
 338                        cur_height = vc->vc_font.height >> 1;
 339                        break;
 340                case CUR_TWO_THIRDS:
 341                        cur_height = (vc->vc_font.height << 1)/3;
 342                        break;
 343                case CUR_BLOCK:
 344                default:
 345                        cur_height = vc->vc_font.height;
 346                        break;
 347                }
 348
 349                size = (vc->vc_font.height - cur_height) * width;
 350                while (size--)
 351                        tmp[i++] = 0;
 352                size = cur_height * width;
 353                while (size--)
 354                        tmp[i++] = 0xff;
 355                memset(mask, 0, w * vc->vc_font.width);
 356                rotate_ccw(tmp, mask, vc->vc_font.width, vc->vc_font.height);
 357                kfree(tmp);
 358        }
 359
 360        switch (mode) {
 361        case CM_ERASE:
 362                ops->cursor_state.enable = 0;
 363                break;
 364        case CM_DRAW:
 365        case CM_MOVE:
 366        default:
 367                ops->cursor_state.enable = (use_sw) ? 0 : 1;
 368                break;
 369        }
 370
 371        cursor.image.data = src;
 372        cursor.image.fg_color = ops->cursor_state.image.fg_color;
 373        cursor.image.bg_color = ops->cursor_state.image.bg_color;
 374        cursor.image.dx = ops->cursor_state.image.dx;
 375        cursor.image.dy = ops->cursor_state.image.dy;
 376        cursor.image.height = ops->cursor_state.image.height;
 377        cursor.image.width = ops->cursor_state.image.width;
 378        cursor.hot.x = ops->cursor_state.hot.x;
 379        cursor.hot.y = ops->cursor_state.hot.y;
 380        cursor.mask = ops->cursor_state.mask;
 381        cursor.enable = ops->cursor_state.enable;
 382        cursor.image.depth = 1;
 383        cursor.rop = ROP_XOR;
 384
 385        if (info->fbops->fb_cursor)
 386                err = info->fbops->fb_cursor(info, &cursor);
 387
 388        if (err)
 389                soft_cursor(info, &cursor);
 390
 391        ops->cursor_reset = 0;
 392}
 393
 394static int ccw_update_start(struct fb_info *info)
 395{
 396        struct fbcon_ops *ops = info->fbcon_par;
 397        u32 yoffset;
 398        u32 vyres = GETVYRES(ops->p->scrollmode, info);
 399        int err;
 400
 401        yoffset = (vyres - info->var.yres) - ops->var.xoffset;
 402        ops->var.xoffset = ops->var.yoffset;
 403        ops->var.yoffset = yoffset;
 404        err = fb_pan_display(info, &ops->var);
 405        ops->var.xoffset = info->var.xoffset;
 406        ops->var.yoffset = info->var.yoffset;
 407        ops->var.vmode = info->var.vmode;
 408        return err;
 409}
 410
 411void fbcon_rotate_ccw(struct fbcon_ops *ops)
 412{
 413        ops->bmove = ccw_bmove;
 414        ops->clear = ccw_clear;
 415        ops->putcs = ccw_putcs;
 416        ops->clear_margins = ccw_clear_margins;
 417        ops->cursor = ccw_cursor;
 418        ops->update_start = ccw_update_start;
 419}
 420EXPORT_SYMBOL(fbcon_rotate_ccw);
 421
 422MODULE_AUTHOR("Antonino Daplas <adaplas@pol.net>");
 423MODULE_DESCRIPTION("Console Rotation (270 degrees) Support");
 424MODULE_LICENSE("GPL");
 425