drivers/video/console/fbcon_ccw.c

   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
  24 static 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
  62 static 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
  79 static 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
  97 static 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
 128 static 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
 190 static 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
 221 static 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
 394 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
 411 void 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 }
 420 EXPORT_SYMBOL(fbcon_rotate_ccw);
 421
 422 MODULE_AUTHOR("Antonino Daplas <adaplas@pol.net>");
 423 MODULE_DESCRIPTION("Console Rotation (270 degrees) Support");
 424 MODULE_LICENSE("GPL");