drivers/usb/misc/sisusbvga/sisusb_con.c

   1 /*
   2  * sisusb - usb kernel driver for SiS315(E) based USB2VGA dongles
   3  *
   4  * VGA text mode console part
   5  *
   6  * Copyright (C) 2005 by Thomas Winischhofer, Vienna, Austria
   7  *
   8  * If distributed as part of the Linux kernel, this code is licensed under the
   9  * terms of the GPL v2.
  10  *
  11  * Otherwise, the following license terms apply:
  12  *
  13  * * Redistribution and use in source and binary forms, with or without
  14  * * modification, are permitted provided that the following conditions
  15  * * are met:
  16  * * 1) Redistributions of source code must retain the above copyright
  17  * *    notice, this list of conditions and the following disclaimer.
  18  * * 2) Redistributions in binary form must reproduce the above copyright
  19  * *    notice, this list of conditions and the following disclaimer in the
  20  * *    documentation and/or other materials provided with the distribution.
  21  * * 3) The name of the author may not be used to endorse or promote products
  22  * *    derived from this software without specific psisusbr written permission.
  23  * *
  24  * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESSED OR
  25  * * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  26  * * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  27  * * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  28  * * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  29  * * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  30  * * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  31  * * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  32  * * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  33  * * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  34  *
  35  * Author: Thomas Winischhofer <thomas@winischhofer.net>
  36  *
  37  * Portions based on vgacon.c which are
  38  *      Created 28 Sep 1997 by Geert Uytterhoeven
  39  *      Rewritten by Martin Mares <mj@ucw.cz>, July 1998
  40  *      based on code Copyright (C) 1991, 1992  Linus Torvalds
  41  *                          1995  Jay Estabrook
  42  *
  43  * A note on using in_atomic() in here: We can't handle console
  44  * calls from non-schedulable context due to our USB-dependend
  45  * nature. For now, this driver just ignores any calls if it
  46  * detects this state.
  47  *
  48  */
  49
  50 #include <linux/mutex.h>
  51 #include <linux/module.h>
  52 #include <linux/kernel.h>
  53 #include <linux/signal.h>
  54 #include <linux/fs.h>
  55 #include <linux/usb.h>
  56 #include <linux/tty.h>
  57 #include <linux/console.h>
  58 #include <linux/string.h>
  59 #include <linux/kd.h>
  60 #include <linux/init.h>
  61 #include <linux/slab.h>
  62 #include <linux/vt_kern.h>
  63 #include <linux/selection.h>
  64 #include <linux/spinlock.h>
  65 #include <linux/kref.h>
  66 #include <linux/ioport.h>
  67 #include <linux/interrupt.h>
  68 #include <linux/vmalloc.h>
  69
  70 #include "sisusb.h"
  71 #include "sisusb_init.h"
  72
  73 #ifdef INCL_SISUSB_CON
  74
  75 #define sisusbcon_writew(val, addr)     (*(addr) = (val))
  76 #define sisusbcon_readw(addr)           (*(addr))
  77 #define sisusbcon_memmovew(d, s, c)     memmove(d, s, c)
  78 #define sisusbcon_memcpyw(d, s, c)      memcpy(d, s, c)
  79
  80 /* vc_data -> sisusb conversion table */
  81 static struct sisusb_usb_data *mysisusbs[MAX_NR_CONSOLES];
  82
  83 /* Forward declaration */
  84 static const struct consw sisusb_con;
  85
  86 static inline void
  87 sisusbcon_memsetw(u16 *s, u16 c, unsigned int count)
  88 {
  89         count /= 2;
  90         while (count--)
  91                 sisusbcon_writew(c, s++);
  92 }
  93
  94 static inline void
  95 sisusb_initialize(struct sisusb_usb_data *sisusb)
  96 {
  97         /* Reset cursor and start address */
  98         if (sisusb_setidxreg(sisusb, SISCR, 0x0c, 0x00))
  99                 return;
 100         if (sisusb_setidxreg(sisusb, SISCR, 0x0d, 0x00))
 101                 return;
 102         if (sisusb_setidxreg(sisusb, SISCR, 0x0e, 0x00))
 103                 return;
 104         sisusb_setidxreg(sisusb, SISCR, 0x0f, 0x00);
 105 }
 106
 107 static inline void
 108 sisusbcon_set_start_address(struct sisusb_usb_data *sisusb, struct vc_data *c)
 109 {
 110         sisusb->cur_start_addr = (c->vc_visible_origin - sisusb->scrbuf) / 2;
 111
 112         sisusb_setidxreg(sisusb, SISCR, 0x0c, (sisusb->cur_start_addr >> 8));
 113         sisusb_setidxreg(sisusb, SISCR, 0x0d, (sisusb->cur_start_addr & 0xff));
 114 }
 115
 116 void
 117 sisusb_set_cursor(struct sisusb_usb_data *sisusb, unsigned int location)
 118 {
 119         if (sisusb->sisusb_cursor_loc == location)
 120                 return;
 121
 122         sisusb->sisusb_cursor_loc = location;
 123
 124         /* Hardware bug: Text cursor appears twice or not at all
 125          * at some positions. Work around it with the cursor skew
 126          * bits.
 127          */
 128
 129         if ((location & 0x0007) == 0x0007) {
 130                 sisusb->bad_cursor_pos = 1;
 131                 location--;
 132                 if (sisusb_setidxregandor(sisusb, SISCR, 0x0b, 0x1f, 0x20))
 133                         return;
 134         } else if (sisusb->bad_cursor_pos) {
 135                 if (sisusb_setidxregand(sisusb, SISCR, 0x0b, 0x1f))
 136                         return;
 137                 sisusb->bad_cursor_pos = 0;
 138         }
 139
 140         if (sisusb_setidxreg(sisusb, SISCR, 0x0e, (location >> 8)))
 141                 return;
 142         sisusb_setidxreg(sisusb, SISCR, 0x0f, (location & 0xff));
 143 }
 144
 145 static inline struct sisusb_usb_data *
 146 sisusb_get_sisusb(unsigned short console)
 147 {
 148         return mysisusbs[console];
 149 }
 150
 151 static inline int
 152 sisusb_sisusb_valid(struct sisusb_usb_data *sisusb)
 153 {
 154         if (!sisusb->present || !sisusb->ready || !sisusb->sisusb_dev)
 155                 return 0;
 156
 157         return 1;
 158 }
 159
 160 static struct sisusb_usb_data *
 161 sisusb_get_sisusb_lock_and_check(unsigned short console)
 162 {
 163         struct sisusb_usb_data *sisusb;
 164
 165         /* We can't handle console calls in non-schedulable
 166          * context due to our locks and the USB transport.
 167          * So we simply ignore them. This should only affect
 168          * some calls to printk.
 169          */
 170         if (in_atomic())
 171                 return NULL;
 172
 173         if (!(sisusb = sisusb_get_sisusb(console)))
 174                 return NULL;
 175
 176         mutex_lock(&sisusb->lock);
 177
 178         if (!sisusb_sisusb_valid(sisusb) ||
 179             !sisusb->havethisconsole[console]) {
 180                 mutex_unlock(&sisusb->lock);
 181                 return NULL;
 182         }
 183
 184         return sisusb;
 185 }
 186
 187 static int
 188 sisusb_is_inactive(struct vc_data *c, struct sisusb_usb_data *sisusb)
 189 {
 190         if (sisusb->is_gfx ||
 191             sisusb->textmodedestroyed ||
 192             c->vc_mode != KD_TEXT)
 193                 return 1;
 194
 195         return 0;
 196 }
 197
 198 /* con_startup console interface routine */
 199 static const char *
 200 sisusbcon_startup(void)
 201 {
 202         return "SISUSBCON";
 203 }
 204
 205 /* con_init console interface routine */
 206 static void
 207 sisusbcon_init(struct vc_data *c, int init)
 208 {
 209         struct sisusb_usb_data *sisusb;
 210         int cols, rows;
 211
 212         /* This is called by take_over_console(),
 213          * ie by us/under our control. It is
 214          * only called after text mode and fonts
 215          * are set up/restored.
 216          */
 217
 218         if (!(sisusb = sisusb_get_sisusb(c->vc_num)))
 219                 return;
 220
 221         mutex_lock(&sisusb->lock);
 222
 223         if (!sisusb_sisusb_valid(sisusb)) {
 224                 mutex_unlock(&sisusb->lock);
 225                 return;
 226         }
 227
 228         c->vc_can_do_color = 1;
 229
 230         c->vc_complement_mask = 0x7700;
 231
 232         c->vc_hi_font_mask = sisusb->current_font_512 ? 0x0800 : 0;
 233
 234         sisusb->haveconsole = 1;
 235
 236         sisusb->havethisconsole[c->vc_num] = 1;
 237
 238         /* We only support 640x400 */
 239         c->vc_scan_lines = 400;
 240
 241         c->vc_font.height = sisusb->current_font_height;
 242
 243         /* We only support width = 8 */
 244         cols = 80;
 245         rows = c->vc_scan_lines / c->vc_font.height;
 246
 247         /* Increment usage count for our sisusb.
 248          * Doing so saves us from upping/downing
 249          * the disconnect semaphore; we can't
 250          * lose our sisusb until this is undone
 251          * in con_deinit. For all other console
 252          * interface functions, it suffices to
 253          * use sisusb->lock and do a quick check
 254          * of sisusb for device disconnection.
 255          */
 256         kref_get(&sisusb->kref);
 257
 258         if (!*c->vc_uni_pagedir_loc)
 259                 con_set_default_unimap(c);
 260
 261         mutex_unlock(&sisusb->lock);
 262
 263         if (init) {
 264                 c->vc_cols = cols;
 265                 c->vc_rows = rows;
 266         } else
 267                 vc_resize(c, cols, rows);
 268 }
 269
 270 /* con_deinit console interface routine */
 271 static void
 272 sisusbcon_deinit(struct vc_data *c)
 273 {
 274         struct sisusb_usb_data *sisusb;
 275         int i;
 276
 277         /* This is called by take_over_console()
 278          * and others, ie not under our control.
 279          */
 280
 281         if (!(sisusb = sisusb_get_sisusb(c->vc_num)))
 282                 return;
 283
 284         mutex_lock(&sisusb->lock);
 285
 286         /* Clear ourselves in mysisusbs */
 287         mysisusbs[c->vc_num] = NULL;
 288
 289         sisusb->havethisconsole[c->vc_num] = 0;
 290
 291         /* Free our font buffer if all consoles are gone */
 292         if (sisusb->font_backup) {
 293                 for(i = 0; i < MAX_NR_CONSOLES; i++) {
 294                         if (sisusb->havethisconsole[c->vc_num])
 295                                 break;
 296                 }
 297                 if (i == MAX_NR_CONSOLES) {
 298                         vfree(sisusb->font_backup);
 299                         sisusb->font_backup = NULL;
 300                 }
 301         }
 302
 303         mutex_unlock(&sisusb->lock);
 304
 305         /* decrement the usage count on our sisusb */
 306         kref_put(&sisusb->kref, sisusb_delete);
 307 }
 308
 309 /* interface routine */
 310 static u8
 311 sisusbcon_build_attr(struct vc_data *c, u8 color, u8 intensity,
 312                             u8 blink, u8 underline, u8 reverse, u8 unused)
 313 {
 314         u8 attr = color;
 315
 316         if (underline)
 317                 attr = (attr & 0xf0) | c->vc_ulcolor;
 318         else if (intensity == 0)
 319                 attr = (attr & 0xf0) | c->vc_halfcolor;
 320
 321         if (reverse)
 322                 attr = ((attr) & 0x88) |
 323                        ((((attr) >> 4) |
 324                        ((attr) << 4)) & 0x77);
 325
 326         if (blink)
 327                 attr ^= 0x80;
 328
 329         if (intensity == 2)
 330                 attr ^= 0x08;
 331
 332         return attr;
 333 }
 334
 335 /* Interface routine */
 336 static void
 337 sisusbcon_invert_region(struct vc_data *vc, u16 *p, int count)
 338 {
 339         /* Invert a region. This is called with a pointer
 340          * to the console's internal screen buffer. So we
 341          * simply do the inversion there and rely on
 342          * a call to putc(s) to update the real screen.
 343          */
 344
 345         while (count--) {
 346                 u16 a = sisusbcon_readw(p);
 347
 348                 a = ((a) & 0x88ff)        |
 349                     (((a) & 0x7000) >> 4) |
 350                     (((a) & 0x0700) << 4);
 351
 352                 sisusbcon_writew(a, p++);
 353         }
 354 }
 355
 356 #define SISUSB_VADDR(x,y) \
 357         ((u16 *)c->vc_origin + \
 358         (y) * sisusb->sisusb_num_columns + \
 359         (x))
 360
 361 #define SISUSB_HADDR(x,y) \
 362         ((u16 *)(sisusb->vrambase + (c->vc_origin - sisusb->scrbuf)) + \
 363         (y) * sisusb->sisusb_num_columns + \
 364         (x))
 365
 366 /* Interface routine */
 367 static void
 368 sisusbcon_putc(struct vc_data *c, int ch, int y, int x)
 369 {
 370         struct sisusb_usb_data *sisusb;
 371         ssize_t written;
 372
 373         if (!(sisusb = sisusb_get_sisusb_lock_and_check(c->vc_num)))
 374                 return;
 375
 376         /* sisusb->lock is down */
 377         if (sisusb_is_inactive(c, sisusb)) {
 378                 mutex_unlock(&sisusb->lock);
 379                 return;
 380         }
 381
 382
 383         sisusb_copy_memory(sisusb, (char *)SISUSB_VADDR(x, y),
 384                                 (long)SISUSB_HADDR(x, y), 2, &written);
 385
 386         mutex_unlock(&sisusb->lock);
 387 }
 388
 389 /* Interface routine */
 390 static void
 391 sisusbcon_putcs(struct vc_data *c, const unsigned short *s,
 392                          int count, int y, int x)
 393 {
 394         struct sisusb_usb_data *sisusb;
 395         ssize_t written;
 396         u16 *dest;
 397         int i;
 398
 399         if (!(sisusb = sisusb_get_sisusb_lock_and_check(c->vc_num)))
 400                 return;
 401
 402         /* sisusb->lock is down */
 403
 404         /* Need to put the characters into the buffer ourselves,
 405          * because the vt does this AFTER calling us.
 406          */
 407
 408         dest = SISUSB_VADDR(x, y);
 409
 410         for (i = count; i > 0; i--)
 411                 sisusbcon_writew(sisusbcon_readw(s++), dest++);
 412
 413         if (sisusb_is_inactive(c, sisusb)) {
 414                 mutex_unlock(&sisusb->lock);
 415                 return;
 416         }
 417
 418         sisusb_copy_memory(sisusb, (char *)SISUSB_VADDR(x, y),
 419                                 (long)SISUSB_HADDR(x, y), count * 2, &written);
 420
 421         mutex_unlock(&sisusb->lock);
 422 }
 423
 424 /* Interface routine */
 425 static void
 426 sisusbcon_clear(struct vc_data *c, int y, int x, int height, int width)
 427 {
 428         struct sisusb_usb_data *sisusb;
 429         u16 eattr = c->vc_video_erase_char;
 430         ssize_t written;
 431         int i, length, cols;
 432         u16 *dest;
 433
 434         if (width <= 0 || height <= 0)
 435                 return;
 436
 437         if (!(sisusb = sisusb_get_sisusb_lock_and_check(c->vc_num)))
 438                 return;
 439
 440         /* sisusb->lock is down */
 441
 442         /* Need to clear buffer ourselves, because the vt does
 443          * this AFTER calling us.
 444          */
 445
 446         dest = SISUSB_VADDR(x, y);
 447
 448         cols = sisusb->sisusb_num_columns;
 449
 450         if (width > cols)
 451                 width = cols;
 452
 453         if (x == 0 && width >= c->vc_cols) {
 454
 455                 sisusbcon_memsetw(dest, eattr, height * cols * 2);
 456
 457         } else {
 458
 459                 for (i = height; i > 0; i--, dest += cols)
 460                         sisusbcon_memsetw(dest, eattr, width * 2);
 461
 462         }
 463
 464         if (sisusb_is_inactive(c, sisusb)) {
 465                 mutex_unlock(&sisusb->lock);
 466                 return;
 467         }
 468
 469         length = ((height * cols) - x - (cols - width - x)) * 2;
 470
 471
 472         sisusb_copy_memory(sisusb, (unsigned char *)SISUSB_VADDR(x, y),
 473                                 (long)SISUSB_HADDR(x, y), length, &written);
 474
 475         mutex_unlock(&sisusb->lock);
 476 }
 477
 478 /* Interface routine */
 479 static void
 480 sisusbcon_bmove(struct vc_data *c, int sy, int sx,
 481                          int dy, int dx, int height, int width)
 482 {
 483         struct sisusb_usb_data *sisusb;
 484         ssize_t written;
 485         int cols, length;
 486
 487         if (width <= 0 || height <= 0)
 488                 return;
 489
 490         if (!(sisusb = sisusb_get_sisusb_lock_and_check(c->vc_num)))
 491                 return;
 492
 493         /* sisusb->lock is down */
 494
 495         cols = sisusb->sisusb_num_columns;
 496
 497         if (sisusb_is_inactive(c, sisusb)) {
 498                 mutex_unlock(&sisusb->lock);
 499                 return;
 500         }
 501
 502         length = ((height * cols) - dx - (cols - width - dx)) * 2;
 503
 504
 505         sisusb_copy_memory(sisusb, (unsigned char *)SISUSB_VADDR(dx, dy),
 506                                 (long)SISUSB_HADDR(dx, dy), length, &written);
 507
 508         mutex_unlock(&sisusb->lock);
 509 }
 510
 511 /* interface routine */
 512 static int
 513 sisusbcon_switch(struct vc_data *c)
 514 {
 515         struct sisusb_usb_data *sisusb;
 516         ssize_t written;
 517         int length;
 518
 519         /* Returnvalue 0 means we have fully restored screen,
 520          *      and vt doesn't need to call do_update_region().
 521          * Returnvalue != 0 naturally means the opposite.
 522          */
 523
 524         if (!(sisusb = sisusb_get_sisusb_lock_and_check(c->vc_num)))
 525                 return 0;
 526
 527         /* sisusb->lock is down */
 528
 529         /* Don't write to screen if in gfx mode */
 530         if (sisusb_is_inactive(c, sisusb)) {
 531                 mutex_unlock(&sisusb->lock);
 532                 return 0;
 533         }
 534
 535         /* That really should not happen. It would mean we are
 536          * being called while the vc is using its private buffer
 537          * as origin.
 538          */
 539         if (c->vc_origin == (unsigned long)c->vc_screenbuf) {
 540                 mutex_unlock(&sisusb->lock);
 541                 dev_dbg(&sisusb->sisusb_dev->dev, "ASSERT ORIGIN != SCREENBUF!\n");
 542                 return 0;
 543         }
 544
 545         /* Check that we don't copy too much */
 546         length = min((int)c->vc_screenbuf_size,
 547                         (int)(sisusb->scrbuf + sisusb->scrbuf_size - c->vc_origin));
 548
 549         /* Restore the screen contents */
 550         sisusbcon_memcpyw((u16 *)c->vc_origin, (u16 *)c->vc_screenbuf,
 551                                                                 length);
 552
 553         sisusb_copy_memory(sisusb, (unsigned char *)c->vc_origin,
 554                                 (long)SISUSB_HADDR(0, 0),
 555                                 length, &written);
 556
 557         mutex_unlock(&sisusb->lock);
 558
 559         return 0;
 560 }
 561
 562 /* interface routine */
 563 static void
 564 sisusbcon_save_screen(struct vc_data *c)
 565 {
 566         struct sisusb_usb_data *sisusb;
 567         int length;
 568
 569         /* Save the current screen contents to vc's private
 570          * buffer.
 571          */
 572
 573         if (!(sisusb = sisusb_get_sisusb_lock_and_check(c->vc_num)))
 574                 return;
 575
 576         /* sisusb->lock is down */
 577
 578         if (sisusb_is_inactive(c, sisusb)) {
 579                 mutex_unlock(&sisusb->lock);
 580                 return;
 581         }
 582
 583         /* Check that we don't copy too much */
 584         length = min((int)c->vc_screenbuf_size,
 585                         (int)(sisusb->scrbuf + sisusb->scrbuf_size - c->vc_origin));
 586
 587         /* Save the screen contents to vc's private buffer */
 588         sisusbcon_memcpyw((u16 *)c->vc_screenbuf, (u16 *)c->vc_origin,
 589                                                                 length);
 590
 591         mutex_unlock(&sisusb->lock);
 592 }
 593
 594 /* interface routine */
 595 static int
 596 sisusbcon_set_palette(struct vc_data *c, unsigned char *table)
 597 {
 598         struct sisusb_usb_data *sisusb;
 599         int i, j;
 600
 601         /* Return value not used by vt */
 602
 603         if (!CON_IS_VISIBLE(c))
 604                 return -EINVAL;
 605
 606         if (!(sisusb = sisusb_get_sisusb_lock_and_check(c->vc_num)))
 607                 return -EINVAL;
 608
 609         /* sisusb->lock is down */
 610
 611         if (sisusb_is_inactive(c, sisusb)) {
 612                 mutex_unlock(&sisusb->lock);
 613                 return -EINVAL;
 614         }
 615
 616         for (i = j = 0; i < 16; i++) {
 617                 if (sisusb_setreg(sisusb, SISCOLIDX, table[i]))
 618                         break;
 619                 if (sisusb_setreg(sisusb, SISCOLDATA, c->vc_palette[j++] >> 2))
 620                         break;
 621                 if (sisusb_setreg(sisusb, SISCOLDATA, c->vc_palette[j++] >> 2))
 622                         break;
 623                 if (sisusb_setreg(sisusb, SISCOLDATA, c->vc_palette[j++] >> 2))
 624                         break;
 625         }
 626
 627         mutex_unlock(&sisusb->lock);
 628
 629         return 0;
 630 }
 631
 632 /* interface routine */
 633 static int
 634 sisusbcon_blank(struct vc_data *c, int blank, int mode_switch)
 635 {
 636         struct sisusb_usb_data *sisusb;
 637         u8 sr1, cr17, pmreg, cr63;
 638         ssize_t written;
 639         int ret = 0;
 640
 641         if (!(sisusb = sisusb_get_sisusb_lock_and_check(c->vc_num)))
 642                 return 0;
 643
 644         /* sisusb->lock is down */
 645
 646         if (mode_switch)
 647                 sisusb->is_gfx = blank ? 1 : 0;
 648
 649         if (sisusb_is_inactive(c, sisusb)) {
 650                 mutex_unlock(&sisusb->lock);
 651                 return 0;
 652         }
 653
 654         switch (blank) {
 655
 656         case 1:         /* Normal blanking: Clear screen */
 657         case -1:
 658                 sisusbcon_memsetw((u16 *)c->vc_origin,
 659                                 c->vc_video_erase_char,
 660                                 c->vc_screenbuf_size);
 661                 sisusb_copy_memory(sisusb,
 662                                 (unsigned char *)c->vc_origin,
 663                                 (u32)(sisusb->vrambase +
 664                                         (c->vc_origin - sisusb->scrbuf)),
 665                                 c->vc_screenbuf_size, &written);
 666                 sisusb->con_blanked = 1;
 667                 ret = 1;
 668                 break;
 669
 670         default:        /* VESA blanking */
 671                 switch (blank) {
 672                 case 0: /* Unblank */
 673                         sr1   = 0x00;
 674                         cr17  = 0x80;
 675                         pmreg = 0x00;
 676                         cr63  = 0x00;
 677                         ret = 1;
 678                         sisusb->con_blanked = 0;
 679                         break;
 680                 case VESA_VSYNC_SUSPEND + 1:
 681                         sr1   = 0x20;
 682                         cr17  = 0x80;
 683                         pmreg = 0x80;
 684                         cr63  = 0x40;
 685                         break;
 686                 case VESA_HSYNC_SUSPEND + 1:
 687                         sr1   = 0x20;
 688                         cr17  = 0x80;
 689                         pmreg = 0x40;
 690                         cr63  = 0x40;
 691                         break;
 692                 case VESA_POWERDOWN + 1:
 693                         sr1   = 0x20;
 694                         cr17  = 0x00;
 695                         pmreg = 0xc0;
 696                         cr63  = 0x40;
 697                         break;
 698                 default:
 699                         mutex_unlock(&sisusb->lock);
 700                         return -EINVAL;
 701                 }
 702
 703                 sisusb_setidxregandor(sisusb, SISSR, 0x01, ~0x20, sr1);
 704                 sisusb_setidxregandor(sisusb, SISCR, 0x17, 0x7f, cr17);
 705                 sisusb_setidxregandor(sisusb, SISSR, 0x1f, 0x3f, pmreg);
 706                 sisusb_setidxregandor(sisusb, SISCR, 0x63, 0xbf, cr63);
 707
 708         }
 709
 710         mutex_unlock(&sisusb->lock);
 711
 712         return ret;
 713 }
 714
 715 /* interface routine */
 716 static int
 717 sisusbcon_scrolldelta(struct vc_data *c, int lines)
 718 {
 719         struct sisusb_usb_data *sisusb;
 720         int margin = c->vc_size_row * 4;
 721         int ul, we, p, st;
 722
 723         /* The return value does not seem to be used */
 724
 725         if (!(sisusb = sisusb_get_sisusb_lock_and_check(c->vc_num)))
 726                 return 0;
 727
 728         /* sisusb->lock is down */
 729
 730         if (sisusb_is_inactive(c, sisusb)) {
 731                 mutex_unlock(&sisusb->lock);
 732                 return 0;
 733         }
 734
 735         if (!lines)             /* Turn scrollback off */
 736                 c->vc_visible_origin = c->vc_origin;
 737         else {
 738
 739                 if (sisusb->con_rolled_over >
 740                                 (c->vc_scr_end - sisusb->scrbuf) + margin) {
 741
 742                         ul = c->vc_scr_end - sisusb->scrbuf;
 743                         we = sisusb->con_rolled_over + c->vc_size_row;
 744
 745                 } else {
 746
 747                         ul = 0;
 748                         we = sisusb->scrbuf_size;
 749
 750                 }
 751
 752                 p = (c->vc_visible_origin - sisusb->scrbuf - ul + we) % we +
 753                                 lines * c->vc_size_row;
 754
 755                 st = (c->vc_origin - sisusb->scrbuf - ul + we) % we;
 756
 757                 if (st < 2 * margin)
 758                         margin = 0;
 759
 760                 if (p < margin)
 761                         p = 0;
 762
 763                 if (p > st - margin)
 764                         p = st;
 765
 766                 c->vc_visible_origin = sisusb->scrbuf + (p + ul) % we;
 767         }
 768
 769         sisusbcon_set_start_address(sisusb, c);
 770
 771         mutex_unlock(&sisusb->lock);
 772
 773         return 1;
 774 }
 775
 776 /* Interface routine */
 777 static void
 778 sisusbcon_cursor(struct vc_data *c, int mode)
 779 {
 780         struct sisusb_usb_data *sisusb;
 781         int from, to, baseline;
 782
 783         if (!(sisusb = sisusb_get_sisusb_lock_and_check(c->vc_num)))
 784                 return;
 785
 786         /* sisusb->lock is down */
 787
 788         if (sisusb_is_inactive(c, sisusb)) {
 789                 mutex_unlock(&sisusb->lock);
 790                 return;
 791         }
 792
 793         if (c->vc_origin != c->vc_visible_origin) {
 794                 c->vc_visible_origin = c->vc_origin;
 795                 sisusbcon_set_start_address(sisusb, c);
 796         }
 797
 798         if (mode == CM_ERASE) {
 799                 sisusb_setidxregor(sisusb, SISCR, 0x0a, 0x20);
 800                 sisusb->sisusb_cursor_size_to = -1;
 801                 mutex_unlock(&sisusb->lock);
 802                 return;
 803         }
 804
 805         sisusb_set_cursor(sisusb, (c->vc_pos - sisusb->scrbuf) / 2);
 806
 807         baseline = c->vc_font.height - (c->vc_font.height < 10 ? 1 : 2);
 808
 809         switch (c->vc_cursor_type & 0x0f) {
 810                 case CUR_BLOCK:         from = 1;
 811                                         to   = c->vc_font.height;
 812                                         break;
 813                 case CUR_TWO_THIRDS:    from = c->vc_font.height / 3;
 814                                         to   = baseline;
 815                                         break;
 816                 case CUR_LOWER_HALF:    from = c->vc_font.height / 2;
 817                                         to   = baseline;
 818                                         break;
 819                 case CUR_LOWER_THIRD:   from = (c->vc_font.height * 2) / 3;
 820                                         to   = baseline;
 821                                         break;
 822                 case CUR_NONE:          from = 31;
 823                                         to = 30;
 824                                         break;
 825                 default:
 826                 case CUR_UNDERLINE:     from = baseline - 1;
 827                                         to   = baseline;
 828                                         break;
 829         }
 830
 831         if (sisusb->sisusb_cursor_size_from != from ||
 832             sisusb->sisusb_cursor_size_to != to) {
 833
 834                 sisusb_setidxreg(sisusb, SISCR, 0x0a, from);
 835                 sisusb_setidxregandor(sisusb, SISCR, 0x0b, 0xe0, to);
 836
 837                 sisusb->sisusb_cursor_size_from = from;
 838                 sisusb->sisusb_cursor_size_to   = to;
 839         }
 840
 841         mutex_unlock(&sisusb->lock);
 842 }
 843
 844 static int
 845 sisusbcon_scroll_area(struct vc_data *c, struct sisusb_usb_data *sisusb,
 846                                         int t, int b, int dir, int lines)
 847 {
 848         int cols = sisusb->sisusb_num_columns;
 849         int length = ((b - t) * cols) * 2;
 850         u16 eattr = c->vc_video_erase_char;
 851         ssize_t written;
 852
 853         /* sisusb->lock is down */
 854
 855         /* Scroll an area which does not match the
 856          * visible screen's dimensions. This needs
 857          * to be done separately, as it does not
 858          * use hardware panning.
 859          */
 860
 861         switch (dir) {
 862
 863                 case SM_UP:
 864                         sisusbcon_memmovew(SISUSB_VADDR(0, t),
 865                                            SISUSB_VADDR(0, t + lines),
 866                                            (b - t - lines) * cols * 2);
 867                         sisusbcon_memsetw(SISUSB_VADDR(0, b - lines), eattr,
 868                                           lines * cols * 2);
 869                         break;
 870
 871                 case SM_DOWN:
 872                         sisusbcon_memmovew(SISUSB_VADDR(0, t + lines),
 873                                            SISUSB_VADDR(0, t),
 874                                            (b - t - lines) * cols * 2);
 875                         sisusbcon_memsetw(SISUSB_VADDR(0, t), eattr,
 876                                           lines * cols * 2);
 877                         break;
 878         }
 879
 880         sisusb_copy_memory(sisusb, (char *)SISUSB_VADDR(0, t),
 881                                 (long)SISUSB_HADDR(0, t), length, &written);
 882
 883         mutex_unlock(&sisusb->lock);
 884
 885         return 1;
 886 }
 887
 888 /* Interface routine */
 889 static int
 890 sisusbcon_scroll(struct vc_data *c, int t, int b, int dir, int lines)
 891 {
 892         struct sisusb_usb_data *sisusb;
 893         u16 eattr = c->vc_video_erase_char;
 894         ssize_t written;
 895         int copyall = 0;
 896         unsigned long oldorigin;
 897         unsigned int delta = lines * c->vc_size_row;
 898         u32 originoffset;
 899
 900         /* Returning != 0 means we have done the scrolling successfully.
 901          * Returning 0 makes vt do the scrolling on its own.
 902          * Note that con_scroll is only called if the console is
 903          * visible. In that case, the origin should be our buffer,
 904          * not the vt's private one.
 905          */
 906
 907         if (!lines)
 908                 return 1;
 909
 910         if (!(sisusb = sisusb_get_sisusb_lock_and_check(c->vc_num)))
 911                 return 0;
 912
 913         /* sisusb->lock is down */
 914
 915         if (sisusb_is_inactive(c, sisusb)) {
 916                 mutex_unlock(&sisusb->lock);
 917                 return 0;
 918         }
 919
 920         /* Special case */
 921         if (t || b != c->vc_rows)
 922                 return sisusbcon_scroll_area(c, sisusb, t, b, dir, lines);
 923
 924         if (c->vc_origin != c->vc_visible_origin) {
 925                 c->vc_visible_origin = c->vc_origin;
 926                 sisusbcon_set_start_address(sisusb, c);
 927         }
 928
 929         /* limit amount to maximum realistic size */
 930         if (lines > c->vc_rows)
 931                 lines = c->vc_rows;
 932
 933         oldorigin = c->vc_origin;
 934
 935         switch (dir) {
 936
 937         case SM_UP:
 938
 939                 if (c->vc_scr_end + delta >=
 940                                 sisusb->scrbuf + sisusb->scrbuf_size) {
 941                         sisusbcon_memcpyw((u16 *)sisusb->scrbuf,
 942                                           (u16 *)(oldorigin + delta),
 943                                           c->vc_screenbuf_size - delta);
 944                         c->vc_origin = sisusb->scrbuf;
 945                         sisusb->con_rolled_over = oldorigin - sisusb->scrbuf;
 946                         copyall = 1;
 947                 } else
 948                         c->vc_origin += delta;
 949
 950                 sisusbcon_memsetw(
 951                         (u16 *)(c->vc_origin + c->vc_screenbuf_size - delta),
 952                                         eattr, delta);
 953
 954                 break;
 955
 956         case SM_DOWN:
 957
 958                 if (oldorigin - delta < sisusb->scrbuf) {
 959                         sisusbcon_memmovew((u16 *)(sisusb->scrbuf +
 960                                                         sisusb->scrbuf_size -
 961                                                         c->vc_screenbuf_size +
 962                                                         delta),
 963                                            (u16 *)oldorigin,
 964                                            c->vc_screenbuf_size - delta);
 965                         c->vc_origin = sisusb->scrbuf +
 966                                         sisusb->scrbuf_size -
 967                                         c->vc_screenbuf_size;
 968                         sisusb->con_rolled_over = 0;
 969                         copyall = 1;
 970                 } else
 971                         c->vc_origin -= delta;
 972
 973                 c->vc_scr_end = c->vc_origin + c->vc_screenbuf_size;
 974
 975                 scr_memsetw((u16 *)(c->vc_origin), eattr, delta);
 976
 977                 break;
 978         }
 979
 980         originoffset = (u32)(c->vc_origin - sisusb->scrbuf);
 981
 982         if (copyall)
 983                 sisusb_copy_memory(sisusb,
 984                         (char *)c->vc_origin,
 985                         (u32)(sisusb->vrambase + originoffset),
 986                         c->vc_screenbuf_size, &written);
 987         else if (dir == SM_UP)
 988                 sisusb_copy_memory(sisusb,
 989                         (char *)c->vc_origin + c->vc_screenbuf_size - delta,
 990                         (u32)sisusb->vrambase + originoffset +
 991                                         c->vc_screenbuf_size - delta,
 992                         delta, &written);
 993         else
 994                 sisusb_copy_memory(sisusb,
 995                         (char *)c->vc_origin,
 996                         (u32)(sisusb->vrambase + originoffset),
 997                         delta, &written);
 998
 999         c->vc_scr_end = c->vc_origin + c->vc_screenbuf_size;
1000         c->vc_visible_origin = c->vc_origin;
1001
1002         sisusbcon_set_start_address(sisusb, c);
1003
1004         c->vc_pos = c->vc_pos - oldorigin + c->vc_origin;
1005
1006         mutex_unlock(&sisusb->lock);
1007
1008         return 1;
1009 }
1010
1011 /* Interface routine */
1012 static int
1013 sisusbcon_set_origin(struct vc_data *c)
1014 {
1015         struct sisusb_usb_data *sisusb;
1016
1017         /* Returning != 0 means we were successful.
1018          * Returning 0 will vt make to use its own
1019          *      screenbuffer as the origin.
1020          */
1021
1022         if (!(sisusb = sisusb_get_sisusb_lock_and_check(c->vc_num)))
1023                 return 0;
1024
1025         /* sisusb->lock is down */
1026
1027         if (sisusb_is_inactive(c, sisusb) || sisusb->con_blanked) {
1028                 mutex_unlock(&sisusb->lock);
1029                 return 0;
1030         }
1031
1032         c->vc_origin = c->vc_visible_origin = sisusb->scrbuf;
1033
1034         sisusbcon_set_start_address(sisusb, c);
1035
1036         sisusb->con_rolled_over = 0;
1037
1038         mutex_unlock(&sisusb->lock);
1039
1040         return 1;
1041 }
1042
1043 /* Interface routine */
1044 static int
1045 sisusbcon_resize(struct vc_data *c, unsigned int newcols, unsigned int newrows,
1046                  unsigned int user)
1047 {
1048         struct sisusb_usb_data *sisusb;
1049         int fh;
1050
1051         if (!(sisusb = sisusb_get_sisusb_lock_and_check(c->vc_num)))
1052                 return -ENODEV;
1053
1054         fh = sisusb->current_font_height;
1055
1056         mutex_unlock(&sisusb->lock);
1057
1058         /* We are quite unflexible as regards resizing. The vt code
1059          * handles sizes where the line length isn't equal the pitch
1060          * quite badly. As regards the rows, our panning tricks only
1061          * work well if the number of rows equals the visible number
1062          * of rows.
1063          */
1064
1065         if (newcols != 80 || c->vc_scan_lines / fh != newrows)
1066                 return -EINVAL;
1067
1068         return 0;
1069 }
1070
1071 int
1072 sisusbcon_do_font_op(struct sisusb_usb_data *sisusb, int set, int slot,
1073                         u8 *arg, int cmapsz, int ch512, int dorecalc,
1074                         struct vc_data *c, int fh, int uplock)
1075 {
1076         int font_select = 0x00, i, err = 0;
1077         u32 offset = 0;
1078         u8 dummy;
1079
1080         /* sisusb->lock is down */
1081
1082         /*
1083          * The default font is kept in slot 0.
1084          * A user font is loaded in slot 2 (256 ch)
1085          * or 2+3 (512 ch).
1086          */
1087
1088         if ((slot != 0 && slot != 2) || !fh) {
1089                 if (uplock)
1090                         mutex_unlock(&sisusb->lock);
1091                 return -EINVAL;
1092         }
1093
1094         if (set)
1095                 sisusb->font_slot = slot;
1096
1097         /* Default font is always 256 */
1098         if (slot == 0)
1099                 ch512 = 0;
1100         else
1101                 offset = 4 * cmapsz;
1102
1103         font_select = (slot == 0) ? 0x00 : (ch512 ? 0x0e : 0x0a);
1104
1105         err |= sisusb_setidxreg(sisusb, SISSR, 0x00, 0x01); /* Reset */
1106         err |= sisusb_setidxreg(sisusb, SISSR, 0x02, 0x04); /* Write to plane 2 */
1107         err |= sisusb_setidxreg(sisusb, SISSR, 0x04, 0x07); /* Memory mode a0-bf */
1108         err |= sisusb_setidxreg(sisusb, SISSR, 0x00, 0x03); /* Reset */
1109
1110         if (err)
1111                 goto font_op_error;
1112
1113         err |= sisusb_setidxreg(sisusb, SISGR, 0x04, 0x03); /* Select plane read 2 */
1114         err |= sisusb_setidxreg(sisusb, SISGR, 0x05, 0x00); /* Disable odd/even */
1115         err |= sisusb_setidxreg(sisusb, SISGR, 0x06, 0x00); /* Address range a0-bf */
1116
1117         if (err)
1118                 goto font_op_error;
1119
1120         if (arg) {
1121                 if (set)
1122                         for (i = 0; i < cmapsz; i++) {
1123                                 err |= sisusb_writeb(sisusb,
1124                                         sisusb->vrambase + offset + i,
1125                                         arg[i]);
1126                                 if (err)
1127                                         break;
1128                         }
1129                 else
1130                         for (i = 0; i < cmapsz; i++) {
1131                                 err |= sisusb_readb(sisusb,
1132                                         sisusb->vrambase + offset + i,
1133                                         &arg[i]);
1134                                 if (err)
1135                                         break;
1136                         }
1137
1138                 /*
1139                  * In 512-character mode, the character map is not contiguous if
1140                  * we want to remain EGA compatible -- which we do
1141                  */
1142
1143                 if (ch512) {
1144                         if (set)
1145                                 for (i = 0; i < cmapsz; i++) {
1146                                         err |= sisusb_writeb(sisusb,
1147                                                 sisusb->vrambase + offset +
1148                                                         (2 * cmapsz) + i,
1149                                                 arg[cmapsz + i]);
1150                                         if (err)
1151                                                 break;
1152                                 }
1153                         else
1154                                 for (i = 0; i < cmapsz; i++) {
1155                                         err |= sisusb_readb(sisusb,
1156                                                 sisusb->vrambase + offset +
1157                                                         (2 * cmapsz) + i,
1158                                                 &arg[cmapsz + i]);
1159                                         if (err)
1160                                                 break;
1161                                 }
1162                 }
1163         }
1164
1165         if (err)
1166                 goto font_op_error;
1167
1168         err |= sisusb_setidxreg(sisusb, SISSR, 0x00, 0x01); /* Reset */
1169         err |= sisusb_setidxreg(sisusb, SISSR, 0x02, 0x03); /* Write to planes 0+1 */
1170         err |= sisusb_setidxreg(sisusb, SISSR, 0x04, 0x03); /* Memory mode a0-bf */
1171         if (set)
1172                 sisusb_setidxreg(sisusb, SISSR, 0x03, font_select);
1173         err |= sisusb_setidxreg(sisusb, SISSR, 0x00, 0x03); /* Reset end */
1174
1175         if (err)
1176                 goto font_op_error;
1177
1178         err |= sisusb_setidxreg(sisusb, SISGR, 0x04, 0x00); /* Select plane read 0 */
1179         err |= sisusb_setidxreg(sisusb, SISGR, 0x05, 0x10); /* Enable odd/even */
1180         err |= sisusb_setidxreg(sisusb, SISGR, 0x06, 0x06); /* Address range b8-bf */
1181
1182         if (err)
1183                 goto font_op_error;
1184
1185         if ((set) && (ch512 != sisusb->current_font_512)) {
1186
1187                 /* Font is shared among all our consoles.
1188                  * And so is the hi_font_mask.
1189                  */
1190                 for (i = 0; i < MAX_NR_CONSOLES; i++) {
1191                         struct vc_data *c = vc_cons[i].d;
1192                         if (c && c->vc_sw == &sisusb_con)
1193                                 c->vc_hi_font_mask = ch512 ? 0x0800 : 0;
1194                 }
1195
1196                 sisusb->current_font_512 = ch512;
1197
1198                 /* color plane enable register:
1199                         256-char: enable intensity bit
1200                         512-char: disable intensity bit */
1201                 sisusb_getreg(sisusb, SISINPSTAT, &dummy);
1202                 sisusb_setreg(sisusb, SISAR, 0x12);
1203                 sisusb_setreg(sisusb, SISAR, ch512 ? 0x07 : 0x0f);
1204
1205                 sisusb_getreg(sisusb, SISINPSTAT, &dummy);
1206                 sisusb_setreg(sisusb, SISAR, 0x20);
1207                 sisusb_getreg(sisusb, SISINPSTAT, &dummy);
1208         }
1209
1210         if (dorecalc) {
1211
1212                 /*
1213                  * Adjust the screen to fit a font of a certain height
1214                  */
1215
1216                 unsigned char ovr, vde, fsr;
1217                 int rows = 0, maxscan = 0;
1218
1219                 if (c) {
1220
1221                         /* Number of video rows */
1222                         rows = c->vc_scan_lines / fh;
1223                         /* Scan lines to actually display-1 */
1224                         maxscan = rows * fh - 1;
1225
1226                         /*printk(KERN_DEBUG "sisusb recalc rows %d maxscan %d fh %d sl %d\n",
1227                                 rows, maxscan, fh, c->vc_scan_lines);*/
1228
1229                         sisusb_getidxreg(sisusb, SISCR, 0x07, &ovr);
1230                         vde = maxscan & 0xff;
1231                         ovr = (ovr & 0xbd) |
1232                               ((maxscan & 0x100) >> 7) |
1233                               ((maxscan & 0x200) >> 3);
1234                         sisusb_setidxreg(sisusb, SISCR, 0x07, ovr);
1235                         sisusb_setidxreg(sisusb, SISCR, 0x12, vde);
1236
1237                 }
1238
1239                 sisusb_getidxreg(sisusb, SISCR, 0x09, &fsr);
1240                 fsr = (fsr & 0xe0) | (fh - 1);
1241                 sisusb_setidxreg(sisusb, SISCR, 0x09, fsr);
1242                 sisusb->current_font_height = fh;
1243
1244                 sisusb->sisusb_cursor_size_from = -1;
1245                 sisusb->sisusb_cursor_size_to   = -1;
1246
1247         }
1248
1249         if (uplock)
1250                 mutex_unlock(&sisusb->lock);
1251
1252         if (dorecalc && c) {
1253                 int i, rows = c->vc_scan_lines / fh;
1254
1255                 /* Now adjust our consoles' size */
1256
1257                 for (i = 0; i < MAX_NR_CONSOLES; i++) {
1258                         struct vc_data *vc = vc_cons[i].d;
1259
1260                         if (vc && vc->vc_sw == &sisusb_con) {
1261                                 if (CON_IS_VISIBLE(vc)) {
1262                                         vc->vc_sw->con_cursor(vc, CM_DRAW);
1263                                 }
1264                                 vc->vc_font.height = fh;
1265                                 vc_resize(vc, 0, rows);
1266                         }
1267                 }
1268         }
1269
1270         return 0;
1271
1272 font_op_error:
1273         if (uplock)
1274                 mutex_unlock(&sisusb->lock);
1275
1276         return -EIO;
1277 }
1278
1279 /* Interface routine */
1280 static int
1281 sisusbcon_font_set(struct vc_data *c, struct console_font *font,
1282                                                         unsigned flags)
1283 {
1284         struct sisusb_usb_data *sisusb;
1285         unsigned charcount = font->charcount;
1286
1287         if (font->width != 8 || (charcount != 256 && charcount != 512))
1288                 return -EINVAL;
1289
1290         if (!(sisusb = sisusb_get_sisusb_lock_and_check(c->vc_num)))
1291                 return -ENODEV;
1292
1293         /* sisusb->lock is down */
1294
1295         /* Save the user-provided font into a buffer. This
1296          * is used for restoring text mode after quitting
1297          * from X and for the con_getfont routine.
1298          */
1299         if (sisusb->font_backup) {
1300                 if (sisusb->font_backup_size < charcount) {
1301                         vfree(sisusb->font_backup);
1302                         sisusb->font_backup = NULL;
1303                 }
1304         }
1305
1306         if (!sisusb->font_backup)
1307                 sisusb->font_backup = vmalloc(charcount * 32);
1308
1309         if (sisusb->font_backup) {
1310                 memcpy(sisusb->font_backup, font->data, charcount * 32);
1311                 sisusb->font_backup_size = charcount;
1312                 sisusb->font_backup_height = font->height;
1313                 sisusb->font_backup_512 = (charcount == 512) ? 1 : 0;
1314         }
1315
1316         /* do_font_op ups sisusb->lock */
1317
1318         return sisusbcon_do_font_op(sisusb, 1, 2, font->data,
1319                         8192, (charcount == 512),
1320                         (!(flags & KD_FONT_FLAG_DONT_RECALC)) ? 1 : 0,
1321                         c, font->height, 1);
1322 }
1323
1324 /* Interface routine */
1325 static int
1326 sisusbcon_font_get(struct vc_data *c, struct console_font *font)
1327 {
1328         struct sisusb_usb_data *sisusb;
1329
1330         if (!(sisusb = sisusb_get_sisusb_lock_and_check(c->vc_num)))
1331                 return -ENODEV;
1332
1333         /* sisusb->lock is down */
1334
1335         font->width = 8;
1336         font->height = c->vc_font.height;
1337         font->charcount = 256;
1338
1339         if (!font->data) {
1340                 mutex_unlock(&sisusb->lock);
1341                 return 0;
1342         }
1343
1344         if (!sisusb->font_backup) {
1345                 mutex_unlock(&sisusb->lock);
1346                 return -ENODEV;
1347         }
1348
1349         /* Copy 256 chars only, like vgacon */
1350         memcpy(font->data, sisusb->font_backup, 256 * 32);
1351
1352         mutex_unlock(&sisusb->lock);
1353
1354         return 0;
1355 }
1356
1357 /*
1358  *  The console `switch' structure for the sisusb console
1359  */
1360
1361 static const struct consw sisusb_con = {
1362         .owner =                THIS_MODULE,
1363         .con_startup =          sisusbcon_startup,
1364         .con_init =             sisusbcon_init,
1365         .con_deinit =           sisusbcon_deinit,
1366         .con_clear =            sisusbcon_clear,
1367         .con_putc =             sisusbcon_putc,
1368         .con_putcs =            sisusbcon_putcs,
1369         .con_cursor =           sisusbcon_cursor,
1370         .con_scroll =           sisusbcon_scroll,
1371         .con_bmove =            sisusbcon_bmove,
1372         .con_switch =           sisusbcon_switch,
1373         .con_blank =            sisusbcon_blank,
1374         .con_font_set =         sisusbcon_font_set,
1375         .con_font_get =         sisusbcon_font_get,
1376         .con_set_palette =      sisusbcon_set_palette,
1377         .con_scrolldelta =      sisusbcon_scrolldelta,
1378         .con_build_attr =       sisusbcon_build_attr,
1379         .con_invert_region =    sisusbcon_invert_region,
1380         .con_set_origin =       sisusbcon_set_origin,
1381         .con_save_screen =      sisusbcon_save_screen,
1382         .con_resize =           sisusbcon_resize,
1383 };
1384
1385 /* Our very own dummy console driver */
1386
1387 static const char *sisusbdummycon_startup(void)
1388 {
1389     return "SISUSBVGADUMMY";
1390 }
1391
1392 static void sisusbdummycon_init(struct vc_data *vc, int init)
1393 {
1394     vc->vc_can_do_color = 1;
1395     if (init) {
1396         vc->vc_cols = 80;
1397         vc->vc_rows = 25;
1398     } else
1399         vc_resize(vc, 80, 25);
1400 }
1401
1402 static int sisusbdummycon_dummy(void)
1403 {
1404     return 0;
1405 }
1406
1407 #define SISUSBCONDUMMY  (void *)sisusbdummycon_dummy
1408
1409 static const struct consw sisusb_dummy_con = {
1410         .owner =                THIS_MODULE,
1411         .con_startup =          sisusbdummycon_startup,
1412         .con_init =             sisusbdummycon_init,
1413         .con_deinit =           SISUSBCONDUMMY,
1414         .con_clear =            SISUSBCONDUMMY,
1415         .con_putc =             SISUSBCONDUMMY,
1416         .con_putcs =            SISUSBCONDUMMY,
1417         .con_cursor =           SISUSBCONDUMMY,
1418         .con_scroll =           SISUSBCONDUMMY,
1419         .con_bmove =            SISUSBCONDUMMY,
1420         .con_switch =           SISUSBCONDUMMY,
1421         .con_blank =            SISUSBCONDUMMY,
1422         .con_font_set =         SISUSBCONDUMMY,
1423         .con_font_get =         SISUSBCONDUMMY,
1424         .con_font_default =     SISUSBCONDUMMY,
1425         .con_font_copy =        SISUSBCONDUMMY,
1426         .con_set_palette =      SISUSBCONDUMMY,
1427         .con_scrolldelta =      SISUSBCONDUMMY,
1428 };
1429
1430 int
1431 sisusb_console_init(struct sisusb_usb_data *sisusb, int first, int last)
1432 {
1433         int i, ret;
1434
1435         mutex_lock(&sisusb->lock);
1436
1437         /* Erm.. that should not happen */
1438         if (sisusb->haveconsole || !sisusb->SiS_Pr) {
1439                 mutex_unlock(&sisusb->lock);
1440                 return 1;
1441         }
1442
1443         sisusb->con_first = first;
1444         sisusb->con_last  = last;
1445
1446         if (first > last ||
1447             first > MAX_NR_CONSOLES ||
1448             last > MAX_NR_CONSOLES) {
1449                 mutex_unlock(&sisusb->lock);
1450                 return 1;
1451         }
1452
1453         /* If gfxcore not initialized or no consoles given, quit graciously */
1454         if (!sisusb->gfxinit || first < 1 || last < 1) {
1455                 mutex_unlock(&sisusb->lock);
1456                 return 0;
1457         }
1458
1459         sisusb->sisusb_cursor_loc       = -1;
1460         sisusb->sisusb_cursor_size_from = -1;
1461         sisusb->sisusb_cursor_size_to   = -1;
1462
1463         /* Set up text mode (and upload  default font) */
1464         if (sisusb_reset_text_mode(sisusb, 1)) {
1465                 mutex_unlock(&sisusb->lock);
1466                 dev_err(&sisusb->sisusb_dev->dev, "Failed to set up text mode\n");
1467                 return 1;
1468         }
1469
1470         /* Initialize some gfx registers */
1471         sisusb_initialize(sisusb);
1472
1473         for (i = first - 1; i <= last - 1; i++) {
1474                 /* Save sisusb for our interface routines */
1475                 mysisusbs[i] = sisusb;
1476         }
1477
1478         /* Initial console setup */
1479         sisusb->sisusb_num_columns = 80;
1480
1481         /* Use a 32K buffer (matches b8000-bffff area) */
1482         sisusb->scrbuf_size = 32 * 1024;
1483
1484         /* Allocate screen buffer */
1485         if (!(sisusb->scrbuf = (unsigned long)vmalloc(sisusb->scrbuf_size))) {
1486                 mutex_unlock(&sisusb->lock);
1487                 dev_err(&sisusb->sisusb_dev->dev, "Failed to allocate screen buffer\n");
1488                 return 1;
1489         }
1490
1491         mutex_unlock(&sisusb->lock);
1492
1493         /* Now grab the desired console(s) */
1494         ret = take_over_console(&sisusb_con, first - 1, last - 1, 0);
1495
1496         if (!ret)
1497                 sisusb->haveconsole = 1;
1498         else {
1499                 for (i = first - 1; i <= last - 1; i++)
1500                         mysisusbs[i] = NULL;
1501         }
1502
1503         return ret;
1504 }
1505
1506 void
1507 sisusb_console_exit(struct sisusb_usb_data *sisusb)
1508 {
1509         int i;
1510
1511         /* This is called if the device is disconnected
1512          * and while disconnect and lock semaphores
1513          * are up. This should be save because we
1514          * can't lose our sisusb any other way but by
1515          * disconnection (and hence, the disconnect
1516          * sema is for protecting all other access
1517          * functions from disconnection, not the
1518          * other way round).
1519          */
1520
1521         /* Now what do we do in case of disconnection:
1522          * One alternative would be to simply call
1523          * give_up_console(). Nah, not a good idea.
1524          * give_up_console() is obviously buggy as it
1525          * only discards the consw pointer from the
1526          * driver_map, but doesn't adapt vc->vc_sw
1527          * of the affected consoles. Hence, the next
1528          * call to any of the console functions will
1529          * eventually take a trip to oops county.
1530          * Also, give_up_console for some reason
1531          * doesn't decrement our module refcount.
1532          * Instead, we switch our consoles to a private
1533          * dummy console. This, of course, keeps our
1534          * refcount up as well, but it works perfectly.
1535          */
1536
1537         if (sisusb->haveconsole) {
1538                 for (i = 0; i < MAX_NR_CONSOLES; i++)
1539                         if (sisusb->havethisconsole[i])
1540                                 take_over_console(&sisusb_dummy_con, i, i, 0);
1541                                 /* At this point, con_deinit for all our
1542                                  * consoles is executed by take_over_console().
1543                                  */
1544                 sisusb->haveconsole = 0;
1545         }
1546
1547         vfree((void *)sisusb->scrbuf);
1548         sisusb->scrbuf = 0;
1549
1550         vfree(sisusb->font_backup);
1551         sisusb->font_backup = NULL;
1552 }
1553
1554 void __init sisusb_init_concode(void)
1555 {
1556         int i;
1557
1558         for (i = 0; i < MAX_NR_CONSOLES; i++)
1559                 mysisusbs[i] = NULL;
1560 }
1561
1562 #endif /* INCL_CON */
1563
1564
1565