kernel/drivers/video/console/fbcon_cw.c

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