drivers/usb/misc/sisusbvga/sisusb

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This source file includes following definitions.
sisusbcon_memsetw
sisusb_initialize
sisusbcon_set_start_address
sisusb_set_cursor
sisusb_get_sisusb
sisusb_sisusb_valid
sisusb_get_sisusb_lock_and_check
sisusb_is_inactive
sisusbcon_startup
sisusbcon_init
sisusbcon_deinit
sisusbcon_build_attr
sisusbcon_invert_region
sisusb_vaddr
sisusb_haddr
sisusbcon_putc
sisusbcon_putcs
sisusbcon_clear
sisusbcon_switch
sisusbcon_save_screen
sisusbcon_set_palette
sisusbcon_blank
sisusbcon_scrolldelta
sisusbcon_cursor
sisusbcon_scroll_area
sisusbcon_scroll
sisusbcon_set_origin
sisusbcon_resize
sisusbcon_do_font_op
sisusbcon_font_set
sisusbcon_font_get
sisusbdummycon_startup
sisusbdummycon_init
sisusbdummycon_deinit
sisusbdummycon_clear
sisusbdummycon_putc
sisusbdummycon_putcs
sisusbdummycon_cursor
sisusbdummycon_scroll
sisusbdummycon_switch
sisusbdummycon_blank
sisusbdummycon_font_set
sisusbdummycon_font_default
sisusbdummycon_font_copy
sisusb_console_init
sisusb_console_exit
sisusb_init_concode
   1 // SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause)
   2 /*
   3  * sisusb - usb kernel driver for SiS315(E) based USB2VGA dongles
   4  *
   5  * VGA text mode console part
   6  *
   7  * Copyright (C) 2005 by Thomas Winischhofer, Vienna, Austria
   8  *
   9  * If distributed as part of the Linux kernel, this code is licensed under the
  10  * terms of the GPL v2.
  11  *
  12  * Otherwise, the following license terms apply:
  13  *
  14  * * Redistribution and use in source and binary forms, with or without
  15  * * modification, are permitted provided that the following conditions
  16  * * are met:
  17  * * 1) Redistributions of source code must retain the above copyright
  18  * *    notice, this list of conditions and the following disclaimer.
  19  * * 2) Redistributions in binary form must reproduce the above copyright
  20  * *    notice, this list of conditions and the following disclaimer in the
  21  * *    documentation and/or other materials provided with the distribution.
  22  * * 3) The name of the author may not be used to endorse or promote products
  23  * *    derived from this software without specific psisusbr written permission.
  24  * *
  25  * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESSED OR
  26  * * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  27  * * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  28  * * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  29  * * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  30  * * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  31  * * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  32  * * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  33  * * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  34  * * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  35  *
  36  * Author: Thomas Winischhofer <thomas@winischhofer.net>
  37  *
  38  * Portions based on vgacon.c which are
  39  *      Created 28 Sep 1997 by Geert Uytterhoeven
  40  *      Rewritten by Martin Mares <mj@ucw.cz>, July 1998
  41  *      based on code Copyright (C) 1991, 1992  Linus Torvalds
  42  *                          1995  Jay Estabrook
  43  *
  44  * A note on using in_atomic() in here: We can't handle console
  45  * calls from non-schedulable context due to our USB-dependend
  46  * nature. For now, this driver just ignores any calls if it
  47  * detects this state.
  48  *
  49  */
  50 
  51 #include <linux/mutex.h>
  52 #include <linux/module.h>
  53 #include <linux/kernel.h>
  54 #include <linux/signal.h>
  55 #include <linux/fs.h>
  56 #include <linux/usb.h>
  57 #include <linux/tty.h>
  58 #include <linux/console.h>
  59 #include <linux/string.h>
  60 #include <linux/kd.h>
  61 #include <linux/init.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 /* vc_data -> sisusb conversion table */
  74 static struct sisusb_usb_data *mysisusbs[MAX_NR_CONSOLES];
  75 
  76 /* Forward declaration */
  77 static const struct consw sisusb_con;
  78 
  79 static inline void
  80 sisusbcon_memsetw(u16 *s, u16 c, unsigned int count)
  81 {
  82         memset16(s, c, count / 2);
  83 }
  84 
  85 static inline void
  86 sisusb_initialize(struct sisusb_usb_data *sisusb)
  87 {
  88         /* Reset cursor and start address */
  89         if (sisusb_setidxreg(sisusb, SISCR, 0x0c, 0x00))
  90                 return;
  91         if (sisusb_setidxreg(sisusb, SISCR, 0x0d, 0x00))
  92                 return;
  93         if (sisusb_setidxreg(sisusb, SISCR, 0x0e, 0x00))
  94                 return;
  95         sisusb_setidxreg(sisusb, SISCR, 0x0f, 0x00);
  96 }
  97 
  98 static inline void
  99 sisusbcon_set_start_address(struct sisusb_usb_data *sisusb, struct vc_data *c)
 100 {
 101         sisusb->cur_start_addr = (c->vc_visible_origin - sisusb->scrbuf) / 2;
 102 
 103         sisusb_setidxreg(sisusb, SISCR, 0x0c, (sisusb->cur_start_addr >> 8));
 104         sisusb_setidxreg(sisusb, SISCR, 0x0d, (sisusb->cur_start_addr & 0xff));
 105 }
 106 
 107 void
 108 sisusb_set_cursor(struct sisusb_usb_data *sisusb, unsigned int location)
 109 {
 110         if (sisusb->sisusb_cursor_loc == location)
 111                 return;
 112 
 113         sisusb->sisusb_cursor_loc = location;
 114 
 115         /* Hardware bug: Text cursor appears twice or not at all
 116          * at some positions. Work around it with the cursor skew
 117          * bits.
 118          */
 119 
 120         if ((location & 0x0007) == 0x0007) {
 121                 sisusb->bad_cursor_pos = 1;
 122                 location--;
 123                 if (sisusb_setidxregandor(sisusb, SISCR, 0x0b, 0x1f, 0x20))
 124                         return;
 125         } else if (sisusb->bad_cursor_pos) {
 126                 if (sisusb_setidxregand(sisusb, SISCR, 0x0b, 0x1f))
 127                         return;
 128                 sisusb->bad_cursor_pos = 0;
 129         }
 130 
 131         if (sisusb_setidxreg(sisusb, SISCR, 0x0e, (location >> 8)))
 132                 return;
 133         sisusb_setidxreg(sisusb, SISCR, 0x0f, (location & 0xff));
 134 }
 135 
 136 static inline struct sisusb_usb_data *
 137 sisusb_get_sisusb(unsigned short console)
 138 {
 139         return mysisusbs[console];
 140 }
 141 
 142 static inline int
 143 sisusb_sisusb_valid(struct sisusb_usb_data *sisusb)
 144 {
 145         if (!sisusb->present || !sisusb->ready || !sisusb->sisusb_dev)
 146                 return 0;
 147 
 148         return 1;
 149 }
 150 
 151 static struct sisusb_usb_data *
 152 sisusb_get_sisusb_lock_and_check(unsigned short console)
 153 {
 154         struct sisusb_usb_data *sisusb;
 155 
 156         /* We can't handle console calls in non-schedulable
 157          * context due to our locks and the USB transport.
 158          * So we simply ignore them. This should only affect
 159          * some calls to printk.
 160          */
 161         if (in_atomic())
 162                 return NULL;
 163 
 164         sisusb = sisusb_get_sisusb(console);
 165         if (!sisusb)
 166                 return NULL;
 167 
 168         mutex_lock(&sisusb->lock);
 169 
 170         if (!sisusb_sisusb_valid(sisusb) ||
 171             !sisusb->havethisconsole[console]) {
 172                 mutex_unlock(&sisusb->lock);
 173                 return NULL;
 174         }
 175 
 176         return sisusb;
 177 }
 178 
 179 static int
 180 sisusb_is_inactive(struct vc_data *c, struct sisusb_usb_data *sisusb)
 181 {
 182         if (sisusb->is_gfx ||
 183             sisusb->textmodedestroyed ||
 184             c->vc_mode != KD_TEXT)
 185                 return 1;
 186 
 187         return 0;
 188 }
 189 
 190 /* con_startup console interface routine */
 191 static const char *
 192 sisusbcon_startup(void)
 193 {
 194         return "SISUSBCON";
 195 }
 196 
 197 /* con_init console interface routine */
 198 static void
 199 sisusbcon_init(struct vc_data *c, int init)
 200 {
 201         struct sisusb_usb_data *sisusb;
 202         int cols, rows;
 203 
 204         /* This is called by do_take_over_console(),
 205          * ie by us/under our control. It is
 206          * only called after text mode and fonts
 207          * are set up/restored.
 208          */
 209 
 210         sisusb = sisusb_get_sisusb(c->vc_num);
 211         if (!sisusb)
 212                 return;
 213 
 214         mutex_lock(&sisusb->lock);
 215 
 216         if (!sisusb_sisusb_valid(sisusb)) {
 217                 mutex_unlock(&sisusb->lock);
 218                 return;
 219         }
 220 
 221         c->vc_can_do_color = 1;
 222 
 223         c->vc_complement_mask = 0x7700;
 224 
 225         c->vc_hi_font_mask = sisusb->current_font_512 ? 0x0800 : 0;
 226 
 227         sisusb->haveconsole = 1;
 228 
 229         sisusb->havethisconsole[c->vc_num] = 1;
 230 
 231         /* We only support 640x400 */
 232         c->vc_scan_lines = 400;
 233 
 234         c->vc_font.height = sisusb->current_font_height;
 235 
 236         /* We only support width = 8 */
 237         cols = 80;
 238         rows = c->vc_scan_lines / c->vc_font.height;
 239 
 240         /* Increment usage count for our sisusb.
 241          * Doing so saves us from upping/downing
 242          * the disconnect semaphore; we can't
 243          * lose our sisusb until this is undone
 244          * in con_deinit. For all other console
 245          * interface functions, it suffices to
 246          * use sisusb->lock and do a quick check
 247          * of sisusb for device disconnection.
 248          */
 249         kref_get(&sisusb->kref);
 250 
 251         if (!*c->vc_uni_pagedir_loc)
 252                 con_set_default_unimap(c);
 253 
 254         mutex_unlock(&sisusb->lock);
 255 
 256         if (init) {
 257                 c->vc_cols = cols;
 258                 c->vc_rows = rows;
 259         } else
 260                 vc_resize(c, cols, rows);
 261 }
 262 
 263 /* con_deinit console interface routine */
 264 static void
 265 sisusbcon_deinit(struct vc_data *c)
 266 {
 267         struct sisusb_usb_data *sisusb;
 268         int i;
 269 
 270         /* This is called by do_take_over_console()
 271          * and others, ie not under our control.
 272          */
 273 
 274         sisusb = sisusb_get_sisusb(c->vc_num);
 275         if (!sisusb)
 276                 return;
 277 
 278         mutex_lock(&sisusb->lock);
 279 
 280         /* Clear ourselves in mysisusbs */
 281         mysisusbs[c->vc_num] = NULL;
 282 
 283         sisusb->havethisconsole[c->vc_num] = 0;
 284 
 285         /* Free our font buffer if all consoles are gone */
 286         if (sisusb->font_backup) {
 287                 for(i = 0; i < MAX_NR_CONSOLES; i++) {
 288                         if (sisusb->havethisconsole[c->vc_num])
 289                                 break;
 290                 }
 291                 if (i == MAX_NR_CONSOLES) {
 292                         vfree(sisusb->font_backup);
 293                         sisusb->font_backup = NULL;
 294                 }
 295         }
 296 
 297         mutex_unlock(&sisusb->lock);
 298 
 299         /* decrement the usage count on our sisusb */
 300         kref_put(&sisusb->kref, sisusb_delete);
 301 }
 302 
 303 /* interface routine */
 304 static u8
 305 sisusbcon_build_attr(struct vc_data *c, u8 color, u8 intensity,
 306                             u8 blink, u8 underline, u8 reverse, u8 unused)
 307 {
 308         u8 attr = color;
 309 
 310         if (underline)
 311                 attr = (attr & 0xf0) | c->vc_ulcolor;
 312         else if (intensity == 0)
 313                 attr = (attr & 0xf0) | c->vc_halfcolor;
 314 
 315         if (reverse)
 316                 attr = ((attr) & 0x88) |
 317                        ((((attr) >> 4) |
 318                        ((attr) << 4)) & 0x77);
 319 
 320         if (blink)
 321                 attr ^= 0x80;
 322 
 323         if (intensity == 2)
 324                 attr ^= 0x08;
 325 
 326         return attr;
 327 }
 328 
 329 /* Interface routine */
 330 static void
 331 sisusbcon_invert_region(struct vc_data *vc, u16 *p, int count)
 332 {
 333         /* Invert a region. This is called with a pointer
 334          * to the console's internal screen buffer. So we
 335          * simply do the inversion there and rely on
 336          * a call to putc(s) to update the real screen.
 337          */
 338 
 339         while (count--) {
 340                 u16 a = *p;
 341 
 342                 *p++ = ((a) & 0x88ff)        |
 343                        (((a) & 0x7000) >> 4) |
 344                        (((a) & 0x0700) << 4);
 345         }
 346 }
 347 
 348 static inline void *sisusb_vaddr(const struct sisusb_usb_data *sisusb,
 349                 const struct vc_data *c, unsigned int x, unsigned int y)
 350 {
 351         return (u16 *)c->vc_origin + y * sisusb->sisusb_num_columns + x;
 352 }
 353 
 354 static inline unsigned long sisusb_haddr(const struct sisusb_usb_data *sisusb,
 355               const struct vc_data *c, unsigned int x, unsigned int y)
 356 {
 357         unsigned long offset = c->vc_origin - sisusb->scrbuf;
 358 
 359         /* 2 bytes per each character */
 360         offset += 2 * (y * sisusb->sisusb_num_columns + x);
 361 
 362         return sisusb->vrambase + offset;
 363 }
 364 
 365 /* Interface routine */
 366 static void
 367 sisusbcon_putc(struct vc_data *c, int ch, int y, int x)
 368 {
 369         struct sisusb_usb_data *sisusb;
 370 
 371         sisusb = sisusb_get_sisusb_lock_and_check(c->vc_num);
 372         if (!sisusb)
 373                 return;
 374 
 375         /* sisusb->lock is down */
 376         if (sisusb_is_inactive(c, sisusb)) {
 377                 mutex_unlock(&sisusb->lock);
 378                 return;
 379         }
 380 
 381         sisusb_copy_memory(sisusb, sisusb_vaddr(sisusb, c, x, y),
 382                                 sisusb_haddr(sisusb, c, x, y), 2);
 383 
 384         mutex_unlock(&sisusb->lock);
 385 }
 386 
 387 /* Interface routine */
 388 static void
 389 sisusbcon_putcs(struct vc_data *c, const unsigned short *s,
 390                          int count, int y, int x)
 391 {
 392         struct sisusb_usb_data *sisusb;
 393 
 394         sisusb = sisusb_get_sisusb_lock_and_check(c->vc_num);
 395         if (!sisusb)
 396                 return;
 397 
 398         /* sisusb->lock is down */
 399 
 400         /* Need to put the characters into the buffer ourselves,
 401          * because the vt does this AFTER calling us.
 402          */
 403 
 404         memcpy(sisusb_vaddr(sisusb, c, x, y), s, count * 2);
 405 
 406         if (sisusb_is_inactive(c, sisusb)) {
 407                 mutex_unlock(&sisusb->lock);
 408                 return;
 409         }
 410 
 411         sisusb_copy_memory(sisusb, sisusb_vaddr(sisusb, c, x, y),
 412                         sisusb_haddr(sisusb, c, x, y), count * 2);
 413 
 414         mutex_unlock(&sisusb->lock);
 415 }
 416 
 417 /* Interface routine */
 418 static void
 419 sisusbcon_clear(struct vc_data *c, int y, int x, int height, int width)
 420 {
 421         struct sisusb_usb_data *sisusb;
 422         u16 eattr = c->vc_video_erase_char;
 423         int i, length, cols;
 424         u16 *dest;
 425 
 426         if (width <= 0 || height <= 0)
 427                 return;
 428 
 429         sisusb = sisusb_get_sisusb_lock_and_check(c->vc_num);
 430         if (!sisusb)
 431                 return;
 432 
 433         /* sisusb->lock is down */
 434 
 435         /* Need to clear buffer ourselves, because the vt does
 436          * this AFTER calling us.
 437          */
 438 
 439         dest = sisusb_vaddr(sisusb, c, x, y);
 440 
 441         cols = sisusb->sisusb_num_columns;
 442 
 443         if (width > cols)
 444                 width = cols;
 445 
 446         if (x == 0 && width >= c->vc_cols) {
 447 
 448                 sisusbcon_memsetw(dest, eattr, height * cols * 2);
 449 
 450         } else {
 451 
 452                 for (i = height; i > 0; i--, dest += cols)
 453                         sisusbcon_memsetw(dest, eattr, width * 2);
 454 
 455         }
 456 
 457         if (sisusb_is_inactive(c, sisusb)) {
 458                 mutex_unlock(&sisusb->lock);
 459                 return;
 460         }
 461 
 462         length = ((height * cols) - x - (cols - width - x)) * 2;
 463 
 464 
 465         sisusb_copy_memory(sisusb, sisusb_vaddr(sisusb, c, x, y),
 466                         sisusb_haddr(sisusb, c, x, y), length);
 467 
 468         mutex_unlock(&sisusb->lock);
 469 }
 470 
 471 /* interface routine */
 472 static int
 473 sisusbcon_switch(struct vc_data *c)
 474 {
 475         struct sisusb_usb_data *sisusb;
 476         int length;
 477 
 478         /* Returnvalue 0 means we have fully restored screen,
 479          *      and vt doesn't need to call do_update_region().
 480          * Returnvalue != 0 naturally means the opposite.
 481          */
 482 
 483         sisusb = sisusb_get_sisusb_lock_and_check(c->vc_num);
 484         if (!sisusb)
 485                 return 0;
 486 
 487         /* sisusb->lock is down */
 488 
 489         /* Don't write to screen if in gfx mode */
 490         if (sisusb_is_inactive(c, sisusb)) {
 491                 mutex_unlock(&sisusb->lock);
 492                 return 0;
 493         }
 494 
 495         /* That really should not happen. It would mean we are
 496          * being called while the vc is using its private buffer
 497          * as origin.
 498          */
 499         if (c->vc_origin == (unsigned long)c->vc_screenbuf) {
 500                 mutex_unlock(&sisusb->lock);
 501                 dev_dbg(&sisusb->sisusb_dev->dev, "ASSERT ORIGIN != SCREENBUF!\n");
 502                 return 0;
 503         }
 504 
 505         /* Check that we don't copy too much */
 506         length = min((int)c->vc_screenbuf_size,
 507                         (int)(sisusb->scrbuf + sisusb->scrbuf_size - c->vc_origin));
 508 
 509         /* Restore the screen contents */
 510         memcpy((u16 *)c->vc_origin, (u16 *)c->vc_screenbuf, length);
 511 
 512         sisusb_copy_memory(sisusb, (char *)c->vc_origin,
 513                         sisusb_haddr(sisusb, c, 0, 0), length);
 514 
 515         mutex_unlock(&sisusb->lock);
 516 
 517         return 0;
 518 }
 519 
 520 /* interface routine */
 521 static void
 522 sisusbcon_save_screen(struct vc_data *c)
 523 {
 524         struct sisusb_usb_data *sisusb;
 525         int length;
 526 
 527         /* Save the current screen contents to vc's private
 528          * buffer.
 529          */
 530 
 531         sisusb = sisusb_get_sisusb_lock_and_check(c->vc_num);
 532         if (!sisusb)
 533                 return;
 534 
 535         /* sisusb->lock is down */
 536 
 537         if (sisusb_is_inactive(c, sisusb)) {
 538                 mutex_unlock(&sisusb->lock);
 539                 return;
 540         }
 541 
 542         /* Check that we don't copy too much */
 543         length = min((int)c->vc_screenbuf_size,
 544                         (int)(sisusb->scrbuf + sisusb->scrbuf_size - c->vc_origin));
 545 
 546         /* Save the screen contents to vc's private buffer */
 547         memcpy((u16 *)c->vc_screenbuf, (u16 *)c->vc_origin, length);
 548 
 549         mutex_unlock(&sisusb->lock);
 550 }
 551 
 552 /* interface routine */
 553 static void
 554 sisusbcon_set_palette(struct vc_data *c, const unsigned char *table)
 555 {
 556         struct sisusb_usb_data *sisusb;
 557         int i, j;
 558 
 559         /* Return value not used by vt */
 560 
 561         if (!con_is_visible(c))
 562                 return;
 563 
 564         sisusb = sisusb_get_sisusb_lock_and_check(c->vc_num);
 565         if (!sisusb)
 566                 return;
 567 
 568         /* sisusb->lock is down */
 569 
 570         if (sisusb_is_inactive(c, sisusb)) {
 571                 mutex_unlock(&sisusb->lock);
 572                 return;
 573         }
 574 
 575         for (i = j = 0; i < 16; i++) {
 576                 if (sisusb_setreg(sisusb, SISCOLIDX, table[i]))
 577                         break;
 578                 if (sisusb_setreg(sisusb, SISCOLDATA, c->vc_palette[j++] >> 2))
 579                         break;
 580                 if (sisusb_setreg(sisusb, SISCOLDATA, c->vc_palette[j++] >> 2))
 581                         break;
 582                 if (sisusb_setreg(sisusb, SISCOLDATA, c->vc_palette[j++] >> 2))
 583                         break;
 584         }
 585 
 586         mutex_unlock(&sisusb->lock);
 587 }
 588 
 589 /* interface routine */
 590 static int
 591 sisusbcon_blank(struct vc_data *c, int blank, int mode_switch)
 592 {
 593         struct sisusb_usb_data *sisusb;
 594         u8 sr1, cr17, pmreg, cr63;
 595         int ret = 0;
 596 
 597         sisusb = sisusb_get_sisusb_lock_and_check(c->vc_num);
 598         if (!sisusb)
 599                 return 0;
 600 
 601         /* sisusb->lock is down */
 602 
 603         if (mode_switch)
 604                 sisusb->is_gfx = blank ? 1 : 0;
 605 
 606         if (sisusb_is_inactive(c, sisusb)) {
 607                 mutex_unlock(&sisusb->lock);
 608                 return 0;
 609         }
 610 
 611         switch (blank) {
 612 
 613         case 1:         /* Normal blanking: Clear screen */
 614         case -1:
 615                 sisusbcon_memsetw((u16 *)c->vc_origin,
 616                                 c->vc_video_erase_char,
 617                                 c->vc_screenbuf_size);
 618                 sisusb_copy_memory(sisusb, (char *)c->vc_origin,
 619                                 sisusb_haddr(sisusb, c, 0, 0),
 620                                 c->vc_screenbuf_size);
 621                 sisusb->con_blanked = 1;
 622                 ret = 1;
 623                 break;
 624 
 625         default:        /* VESA blanking */
 626                 switch (blank) {
 627                 case 0: /* Unblank */
 628                         sr1   = 0x00;
 629                         cr17  = 0x80;
 630                         pmreg = 0x00;
 631                         cr63  = 0x00;
 632                         ret = 1;
 633                         sisusb->con_blanked = 0;
 634                         break;
 635                 case VESA_VSYNC_SUSPEND + 1:
 636                         sr1   = 0x20;
 637                         cr17  = 0x80;
 638                         pmreg = 0x80;
 639                         cr63  = 0x40;
 640                         break;
 641                 case VESA_HSYNC_SUSPEND + 1:
 642                         sr1   = 0x20;
 643                         cr17  = 0x80;
 644                         pmreg = 0x40;
 645                         cr63  = 0x40;
 646                         break;
 647                 case VESA_POWERDOWN + 1:
 648                         sr1   = 0x20;
 649                         cr17  = 0x00;
 650                         pmreg = 0xc0;
 651                         cr63  = 0x40;
 652                         break;
 653                 default:
 654                         mutex_unlock(&sisusb->lock);
 655                         return -EINVAL;
 656                 }
 657 
 658                 sisusb_setidxregandor(sisusb, SISSR, 0x01, ~0x20, sr1);
 659                 sisusb_setidxregandor(sisusb, SISCR, 0x17, 0x7f, cr17);
 660                 sisusb_setidxregandor(sisusb, SISSR, 0x1f, 0x3f, pmreg);
 661                 sisusb_setidxregandor(sisusb, SISCR, 0x63, 0xbf, cr63);
 662 
 663         }
 664 
 665         mutex_unlock(&sisusb->lock);
 666 
 667         return ret;
 668 }
 669 
 670 /* interface routine */
 671 static void
 672 sisusbcon_scrolldelta(struct vc_data *c, int lines)
 673 {
 674         struct sisusb_usb_data *sisusb;
 675 
 676         sisusb = sisusb_get_sisusb_lock_and_check(c->vc_num);
 677         if (!sisusb)
 678                 return;
 679 
 680         /* sisusb->lock is down */
 681 
 682         if (sisusb_is_inactive(c, sisusb)) {
 683                 mutex_unlock(&sisusb->lock);
 684                 return;
 685         }
 686 
 687         vc_scrolldelta_helper(c, lines, sisusb->con_rolled_over,
 688                         (void *)sisusb->scrbuf, sisusb->scrbuf_size);
 689 
 690         sisusbcon_set_start_address(sisusb, c);
 691 
 692         mutex_unlock(&sisusb->lock);
 693 }
 694 
 695 /* Interface routine */
 696 static void
 697 sisusbcon_cursor(struct vc_data *c, int mode)
 698 {
 699         struct sisusb_usb_data *sisusb;
 700         int from, to, baseline;
 701 
 702         sisusb = sisusb_get_sisusb_lock_and_check(c->vc_num);
 703         if (!sisusb)
 704                 return;
 705 
 706         /* sisusb->lock is down */
 707 
 708         if (sisusb_is_inactive(c, sisusb)) {
 709                 mutex_unlock(&sisusb->lock);
 710                 return;
 711         }
 712 
 713         if (c->vc_origin != c->vc_visible_origin) {
 714                 c->vc_visible_origin = c->vc_origin;
 715                 sisusbcon_set_start_address(sisusb, c);
 716         }
 717 
 718         if (mode == CM_ERASE) {
 719                 sisusb_setidxregor(sisusb, SISCR, 0x0a, 0x20);
 720                 sisusb->sisusb_cursor_size_to = -1;
 721                 mutex_unlock(&sisusb->lock);
 722                 return;
 723         }
 724 
 725         sisusb_set_cursor(sisusb, (c->vc_pos - sisusb->scrbuf) / 2);
 726 
 727         baseline = c->vc_font.height - (c->vc_font.height < 10 ? 1 : 2);
 728 
 729         switch (c->vc_cursor_type & 0x0f) {
 730                 case CUR_BLOCK:         from = 1;
 731                                         to   = c->vc_font.height;
 732                                         break;
 733                 case CUR_TWO_THIRDS:    from = c->vc_font.height / 3;
 734                                         to   = baseline;
 735                                         break;
 736                 case CUR_LOWER_HALF:    from = c->vc_font.height / 2;
 737                                         to   = baseline;
 738                                         break;
 739                 case CUR_LOWER_THIRD:   from = (c->vc_font.height * 2) / 3;
 740                                         to   = baseline;
 741                                         break;
 742                 case CUR_NONE:          from = 31;
 743                                         to = 30;
 744                                         break;
 745                 default:
 746                 case CUR_UNDERLINE:     from = baseline - 1;
 747                                         to   = baseline;
 748                                         break;
 749         }
 750 
 751         if (sisusb->sisusb_cursor_size_from != from ||
 752             sisusb->sisusb_cursor_size_to != to) {
 753 
 754                 sisusb_setidxreg(sisusb, SISCR, 0x0a, from);
 755                 sisusb_setidxregandor(sisusb, SISCR, 0x0b, 0xe0, to);
 756 
 757                 sisusb->sisusb_cursor_size_from = from;
 758                 sisusb->sisusb_cursor_size_to   = to;
 759         }
 760 
 761         mutex_unlock(&sisusb->lock);
 762 }
 763 
 764 static bool
 765 sisusbcon_scroll_area(struct vc_data *c, struct sisusb_usb_data *sisusb,
 766                 unsigned int t, unsigned int b, enum con_scroll dir,
 767                 unsigned int lines)
 768 {
 769         int cols = sisusb->sisusb_num_columns;
 770         int length = ((b - t) * cols) * 2;
 771         u16 eattr = c->vc_video_erase_char;
 772 
 773         /* sisusb->lock is down */
 774 
 775         /* Scroll an area which does not match the
 776          * visible screen's dimensions. This needs
 777          * to be done separately, as it does not
 778          * use hardware panning.
 779          */
 780 
 781         switch (dir) {
 782 
 783                 case SM_UP:
 784                         memmove(sisusb_vaddr(sisusb, c, 0, t),
 785                                            sisusb_vaddr(sisusb, c, 0, t + lines),
 786                                            (b - t - lines) * cols * 2);
 787                         sisusbcon_memsetw(sisusb_vaddr(sisusb, c, 0, b - lines),
 788                                         eattr, lines * cols * 2);
 789                         break;
 790 
 791                 case SM_DOWN:
 792                         memmove(sisusb_vaddr(sisusb, c, 0, t + lines),
 793                                            sisusb_vaddr(sisusb, c, 0, t),
 794                                            (b - t - lines) * cols * 2);
 795                         sisusbcon_memsetw(sisusb_vaddr(sisusb, c, 0, t), eattr,
 796                                           lines * cols * 2);
 797                         break;
 798         }
 799 
 800         sisusb_copy_memory(sisusb, sisusb_vaddr(sisusb, c, 0, t),
 801                         sisusb_haddr(sisusb, c, 0, t), length);
 802 
 803         mutex_unlock(&sisusb->lock);
 804 
 805         return true;
 806 }
 807 
 808 /* Interface routine */
 809 static bool
 810 sisusbcon_scroll(struct vc_data *c, unsigned int t, unsigned int b,
 811                 enum con_scroll dir, unsigned int lines)
 812 {
 813         struct sisusb_usb_data *sisusb;
 814         u16 eattr = c->vc_video_erase_char;
 815         int copyall = 0;
 816         unsigned long oldorigin;
 817         unsigned int delta = lines * c->vc_size_row;
 818 
 819         /* Returning != 0 means we have done the scrolling successfully.
 820          * Returning 0 makes vt do the scrolling on its own.
 821          * Note that con_scroll is only called if the console is
 822          * visible. In that case, the origin should be our buffer,
 823          * not the vt's private one.
 824          */
 825 
 826         if (!lines)
 827                 return true;
 828 
 829         sisusb = sisusb_get_sisusb_lock_and_check(c->vc_num);
 830         if (!sisusb)
 831                 return false;
 832 
 833         /* sisusb->lock is down */
 834 
 835         if (sisusb_is_inactive(c, sisusb)) {
 836                 mutex_unlock(&sisusb->lock);
 837                 return false;
 838         }
 839 
 840         /* Special case */
 841         if (t || b != c->vc_rows)
 842                 return sisusbcon_scroll_area(c, sisusb, t, b, dir, lines);
 843 
 844         if (c->vc_origin != c->vc_visible_origin) {
 845                 c->vc_visible_origin = c->vc_origin;
 846                 sisusbcon_set_start_address(sisusb, c);
 847         }
 848 
 849         /* limit amount to maximum realistic size */
 850         if (lines > c->vc_rows)
 851                 lines = c->vc_rows;
 852 
 853         oldorigin = c->vc_origin;
 854 
 855         switch (dir) {
 856 
 857         case SM_UP:
 858 
 859                 if (c->vc_scr_end + delta >=
 860                                 sisusb->scrbuf + sisusb->scrbuf_size) {
 861                         memcpy((u16 *)sisusb->scrbuf,
 862                                           (u16 *)(oldorigin + delta),
 863                                           c->vc_screenbuf_size - delta);
 864                         c->vc_origin = sisusb->scrbuf;
 865                         sisusb->con_rolled_over = oldorigin - sisusb->scrbuf;
 866                         copyall = 1;
 867                 } else
 868                         c->vc_origin += delta;
 869 
 870                 sisusbcon_memsetw(
 871                         (u16 *)(c->vc_origin + c->vc_screenbuf_size - delta),
 872                                         eattr, delta);
 873 
 874                 break;
 875 
 876         case SM_DOWN:
 877 
 878                 if (oldorigin - delta < sisusb->scrbuf) {
 879                         memmove((void *)sisusb->scrbuf + sisusb->scrbuf_size -
 880                                         c->vc_screenbuf_size + delta,
 881                                         (u16 *)oldorigin,
 882                                         c->vc_screenbuf_size - delta);
 883                         c->vc_origin = sisusb->scrbuf +
 884                                         sisusb->scrbuf_size -
 885                                         c->vc_screenbuf_size;
 886                         sisusb->con_rolled_over = 0;
 887                         copyall = 1;
 888                 } else
 889                         c->vc_origin -= delta;
 890 
 891                 c->vc_scr_end = c->vc_origin + c->vc_screenbuf_size;
 892 
 893                 scr_memsetw((u16 *)(c->vc_origin), eattr, delta);
 894 
 895                 break;
 896         }
 897 
 898         if (copyall)
 899                 sisusb_copy_memory(sisusb,
 900                         (char *)c->vc_origin,
 901                         sisusb_haddr(sisusb, c, 0, 0),
 902                         c->vc_screenbuf_size);
 903         else if (dir == SM_UP)
 904                 sisusb_copy_memory(sisusb,
 905                         (char *)c->vc_origin + c->vc_screenbuf_size - delta,
 906                         sisusb_haddr(sisusb, c, 0, 0) +
 907                                         c->vc_screenbuf_size - delta,
 908                         delta);
 909         else
 910                 sisusb_copy_memory(sisusb,
 911                         (char *)c->vc_origin,
 912                         sisusb_haddr(sisusb, c, 0, 0),
 913                         delta);
 914 
 915         c->vc_scr_end = c->vc_origin + c->vc_screenbuf_size;
 916         c->vc_visible_origin = c->vc_origin;
 917 
 918         sisusbcon_set_start_address(sisusb, c);
 919 
 920         c->vc_pos = c->vc_pos - oldorigin + c->vc_origin;
 921 
 922         mutex_unlock(&sisusb->lock);
 923 
 924         return true;
 925 }
 926 
 927 /* Interface routine */
 928 static int
 929 sisusbcon_set_origin(struct vc_data *c)
 930 {
 931         struct sisusb_usb_data *sisusb;
 932 
 933         /* Returning != 0 means we were successful.
 934          * Returning 0 will vt make to use its own
 935          *      screenbuffer as the origin.
 936          */
 937 
 938         sisusb = sisusb_get_sisusb_lock_and_check(c->vc_num);
 939         if (!sisusb)
 940                 return 0;
 941 
 942         /* sisusb->lock is down */
 943 
 944         if (sisusb_is_inactive(c, sisusb) || sisusb->con_blanked) {
 945                 mutex_unlock(&sisusb->lock);
 946                 return 0;
 947         }
 948 
 949         c->vc_origin = c->vc_visible_origin = sisusb->scrbuf;
 950 
 951         sisusbcon_set_start_address(sisusb, c);
 952 
 953         sisusb->con_rolled_over = 0;
 954 
 955         mutex_unlock(&sisusb->lock);
 956 
 957         return true;
 958 }
 959 
 960 /* Interface routine */
 961 static int
 962 sisusbcon_resize(struct vc_data *c, unsigned int newcols, unsigned int newrows,
 963                  unsigned int user)
 964 {
 965         struct sisusb_usb_data *sisusb;
 966         int fh;
 967 
 968         sisusb = sisusb_get_sisusb_lock_and_check(c->vc_num);
 969         if (!sisusb)
 970                 return -ENODEV;
 971 
 972         fh = sisusb->current_font_height;
 973 
 974         mutex_unlock(&sisusb->lock);
 975 
 976         /* We are quite unflexible as regards resizing. The vt code
 977          * handles sizes where the line length isn't equal the pitch
 978          * quite badly. As regards the rows, our panning tricks only
 979          * work well if the number of rows equals the visible number
 980          * of rows.
 981          */
 982 
 983         if (newcols != 80 || c->vc_scan_lines / fh != newrows)
 984                 return -EINVAL;
 985 
 986         return 0;
 987 }
 988 
 989 int
 990 sisusbcon_do_font_op(struct sisusb_usb_data *sisusb, int set, int slot,
 991                         u8 *arg, int cmapsz, int ch512, int dorecalc,
 992                         struct vc_data *c, int fh, int uplock)
 993 {
 994         int font_select = 0x00, i, err = 0;
 995         u32 offset = 0;
 996         u8 dummy;
 997 
 998         /* sisusb->lock is down */
 999 
1000         /*
1001          * The default font is kept in slot 0.
1002          * A user font is loaded in slot 2 (256 ch)
1003          * or 2+3 (512 ch).
1004          */
1005 
1006         if ((slot != 0 && slot != 2) || !fh) {
1007                 if (uplock)
1008                         mutex_unlock(&sisusb->lock);
1009                 return -EINVAL;
1010         }
1011 
1012         if (set)
1013                 sisusb->font_slot = slot;
1014 
1015         /* Default font is always 256 */
1016         if (slot == 0)
1017                 ch512 = 0;
1018         else
1019                 offset = 4 * cmapsz;
1020 
1021         font_select = (slot == 0) ? 0x00 : (ch512 ? 0x0e : 0x0a);
1022 
1023         err |= sisusb_setidxreg(sisusb, SISSR, 0x00, 0x01); /* Reset */
1024         err |= sisusb_setidxreg(sisusb, SISSR, 0x02, 0x04); /* Write to plane 2 */
1025         err |= sisusb_setidxreg(sisusb, SISSR, 0x04, 0x07); /* Memory mode a0-bf */
1026         err |= sisusb_setidxreg(sisusb, SISSR, 0x00, 0x03); /* Reset */
1027 
1028         if (err)
1029                 goto font_op_error;
1030 
1031         err |= sisusb_setidxreg(sisusb, SISGR, 0x04, 0x03); /* Select plane read 2 */
1032         err |= sisusb_setidxreg(sisusb, SISGR, 0x05, 0x00); /* Disable odd/even */
1033         err |= sisusb_setidxreg(sisusb, SISGR, 0x06, 0x00); /* Address range a0-bf */
1034 
1035         if (err)
1036                 goto font_op_error;
1037 
1038         if (arg) {
1039                 if (set)
1040                         for (i = 0; i < cmapsz; i++) {
1041                                 err |= sisusb_writeb(sisusb,
1042                                         sisusb->vrambase + offset + i,
1043                                         arg[i]);
1044                                 if (err)
1045                                         break;
1046                         }
1047                 else
1048                         for (i = 0; i < cmapsz; i++) {
1049                                 err |= sisusb_readb(sisusb,
1050                                         sisusb->vrambase + offset + i,
1051                                         &arg[i]);
1052                                 if (err)
1053                                         break;
1054                         }
1055 
1056                 /*
1057                  * In 512-character mode, the character map is not contiguous if
1058                  * we want to remain EGA compatible -- which we do
1059                  */
1060 
1061                 if (ch512) {
1062                         if (set)
1063                                 for (i = 0; i < cmapsz; i++) {
1064                                         err |= sisusb_writeb(sisusb,
1065                                                 sisusb->vrambase + offset +
1066                                                         (2 * cmapsz) + i,
1067                                                 arg[cmapsz + i]);
1068                                         if (err)
1069                                                 break;
1070                                 }
1071                         else
1072                                 for (i = 0; i < cmapsz; i++) {
1073                                         err |= sisusb_readb(sisusb,
1074                                                 sisusb->vrambase + offset +
1075                                                         (2 * cmapsz) + i,
1076                                                 &arg[cmapsz + i]);
1077                                         if (err)
1078                                                 break;
1079                                 }
1080                 }
1081         }
1082 
1083         if (err)
1084                 goto font_op_error;
1085 
1086         err |= sisusb_setidxreg(sisusb, SISSR, 0x00, 0x01); /* Reset */
1087         err |= sisusb_setidxreg(sisusb, SISSR, 0x02, 0x03); /* Write to planes 0+1 */
1088         err |= sisusb_setidxreg(sisusb, SISSR, 0x04, 0x03); /* Memory mode a0-bf */
1089         if (set)
1090                 sisusb_setidxreg(sisusb, SISSR, 0x03, font_select);
1091         err |= sisusb_setidxreg(sisusb, SISSR, 0x00, 0x03); /* Reset end */
1092 
1093         if (err)
1094                 goto font_op_error;
1095 
1096         err |= sisusb_setidxreg(sisusb, SISGR, 0x04, 0x00); /* Select plane read 0 */
1097         err |= sisusb_setidxreg(sisusb, SISGR, 0x05, 0x10); /* Enable odd/even */
1098         err |= sisusb_setidxreg(sisusb, SISGR, 0x06, 0x06); /* Address range b8-bf */
1099 
1100         if (err)
1101                 goto font_op_error;
1102 
1103         if ((set) && (ch512 != sisusb->current_font_512)) {
1104 
1105                 /* Font is shared among all our consoles.
1106                  * And so is the hi_font_mask.
1107                  */
1108                 for (i = 0; i < MAX_NR_CONSOLES; i++) {
1109                         struct vc_data *d = vc_cons[i].d;
1110                         if (d && d->vc_sw == &sisusb_con)
1111                                 d->vc_hi_font_mask = ch512 ? 0x0800 : 0;
1112                 }
1113 
1114                 sisusb->current_font_512 = ch512;
1115 
1116                 /* color plane enable register:
1117                         256-char: enable intensity bit
1118                         512-char: disable intensity bit */
1119                 sisusb_getreg(sisusb, SISINPSTAT, &dummy);
1120                 sisusb_setreg(sisusb, SISAR, 0x12);
1121                 sisusb_setreg(sisusb, SISAR, ch512 ? 0x07 : 0x0f);
1122 
1123                 sisusb_getreg(sisusb, SISINPSTAT, &dummy);
1124                 sisusb_setreg(sisusb, SISAR, 0x20);
1125                 sisusb_getreg(sisusb, SISINPSTAT, &dummy);
1126         }
1127 
1128         if (dorecalc) {
1129 
1130                 /*
1131                  * Adjust the screen to fit a font of a certain height
1132                  */
1133 
1134                 unsigned char ovr, vde, fsr;
1135                 int rows = 0, maxscan = 0;
1136 
1137                 if (c) {
1138 
1139                         /* Number of video rows */
1140                         rows = c->vc_scan_lines / fh;
1141                         /* Scan lines to actually display-1 */
1142                         maxscan = rows * fh - 1;
1143 
1144                         /*printk(KERN_DEBUG "sisusb recalc rows %d maxscan %d fh %d sl %d\n",
1145                                 rows, maxscan, fh, c->vc_scan_lines);*/
1146 
1147                         sisusb_getidxreg(sisusb, SISCR, 0x07, &ovr);
1148                         vde = maxscan & 0xff;
1149                         ovr = (ovr & 0xbd) |
1150                               ((maxscan & 0x100) >> 7) |
1151                               ((maxscan & 0x200) >> 3);
1152                         sisusb_setidxreg(sisusb, SISCR, 0x07, ovr);
1153                         sisusb_setidxreg(sisusb, SISCR, 0x12, vde);
1154 
1155                 }
1156 
1157                 sisusb_getidxreg(sisusb, SISCR, 0x09, &fsr);
1158                 fsr = (fsr & 0xe0) | (fh - 1);
1159                 sisusb_setidxreg(sisusb, SISCR, 0x09, fsr);
1160                 sisusb->current_font_height = fh;
1161 
1162                 sisusb->sisusb_cursor_size_from = -1;
1163                 sisusb->sisusb_cursor_size_to   = -1;
1164 
1165         }
1166 
1167         if (uplock)
1168                 mutex_unlock(&sisusb->lock);
1169 
1170         if (dorecalc && c) {
1171                 int rows = c->vc_scan_lines / fh;
1172 
1173                 /* Now adjust our consoles' size */
1174 
1175                 for (i = 0; i < MAX_NR_CONSOLES; i++) {
1176                         struct vc_data *vc = vc_cons[i].d;
1177 
1178                         if (vc && vc->vc_sw == &sisusb_con) {
1179                                 if (con_is_visible(vc)) {
1180                                         vc->vc_sw->con_cursor(vc, CM_DRAW);
1181                                 }
1182                                 vc->vc_font.height = fh;
1183                                 vc_resize(vc, 0, rows);
1184                         }
1185                 }
1186         }
1187 
1188         return 0;
1189 
1190 font_op_error:
1191         if (uplock)
1192                 mutex_unlock(&sisusb->lock);
1193 
1194         return -EIO;
1195 }
1196 
1197 /* Interface routine */
1198 static int
1199 sisusbcon_font_set(struct vc_data *c, struct console_font *font,
1200                    unsigned int flags)
1201 {
1202         struct sisusb_usb_data *sisusb;
1203         unsigned charcount = font->charcount;
1204 
1205         if (font->width != 8 || (charcount != 256 && charcount != 512))
1206                 return -EINVAL;
1207 
1208         sisusb = sisusb_get_sisusb_lock_and_check(c->vc_num);
1209         if (!sisusb)
1210                 return -ENODEV;
1211 
1212         /* sisusb->lock is down */
1213 
1214         /* Save the user-provided font into a buffer. This
1215          * is used for restoring text mode after quitting
1216          * from X and for the con_getfont routine.
1217          */
1218         if (sisusb->font_backup) {
1219                 if (sisusb->font_backup_size < charcount) {
1220                         vfree(sisusb->font_backup);
1221                         sisusb->font_backup = NULL;
1222                 }
1223         }
1224 
1225         if (!sisusb->font_backup)
1226                 sisusb->font_backup = vmalloc(array_size(charcount, 32));
1227 
1228         if (sisusb->font_backup) {
1229                 memcpy(sisusb->font_backup, font->data, charcount * 32);
1230                 sisusb->font_backup_size = charcount;
1231                 sisusb->font_backup_height = font->height;
1232                 sisusb->font_backup_512 = (charcount == 512) ? 1 : 0;
1233         }
1234 
1235         /* do_font_op ups sisusb->lock */
1236 
1237         return sisusbcon_do_font_op(sisusb, 1, 2, font->data,
1238                         8192, (charcount == 512),
1239                         (!(flags & KD_FONT_FLAG_DONT_RECALC)) ? 1 : 0,
1240                         c, font->height, 1);
1241 }
1242 
1243 /* Interface routine */
1244 static int
1245 sisusbcon_font_get(struct vc_data *c, struct console_font *font)
1246 {
1247         struct sisusb_usb_data *sisusb;
1248 
1249         sisusb = sisusb_get_sisusb_lock_and_check(c->vc_num);
1250         if (!sisusb)
1251                 return -ENODEV;
1252 
1253         /* sisusb->lock is down */
1254 
1255         font->width = 8;
1256         font->height = c->vc_font.height;
1257         font->charcount = 256;
1258 
1259         if (!font->data) {
1260                 mutex_unlock(&sisusb->lock);
1261                 return 0;
1262         }
1263 
1264         if (!sisusb->font_backup) {
1265                 mutex_unlock(&sisusb->lock);
1266                 return -ENODEV;
1267         }
1268 
1269         /* Copy 256 chars only, like vgacon */
1270         memcpy(font->data, sisusb->font_backup, 256 * 32);
1271 
1272         mutex_unlock(&sisusb->lock);
1273 
1274         return 0;
1275 }
1276 
1277 /*
1278  *  The console `switch' structure for the sisusb console
1279  */
1280 
1281 static const struct consw sisusb_con = {
1282         .owner =                THIS_MODULE,
1283         .con_startup =          sisusbcon_startup,
1284         .con_init =             sisusbcon_init,
1285         .con_deinit =           sisusbcon_deinit,
1286         .con_clear =            sisusbcon_clear,
1287         .con_putc =             sisusbcon_putc,
1288         .con_putcs =            sisusbcon_putcs,
1289         .con_cursor =           sisusbcon_cursor,
1290         .con_scroll =           sisusbcon_scroll,
1291         .con_switch =           sisusbcon_switch,
1292         .con_blank =            sisusbcon_blank,
1293         .con_font_set =         sisusbcon_font_set,
1294         .con_font_get =         sisusbcon_font_get,
1295         .con_set_palette =      sisusbcon_set_palette,
1296         .con_scrolldelta =      sisusbcon_scrolldelta,
1297         .con_build_attr =       sisusbcon_build_attr,
1298         .con_invert_region =    sisusbcon_invert_region,
1299         .con_set_origin =       sisusbcon_set_origin,
1300         .con_save_screen =      sisusbcon_save_screen,
1301         .con_resize =           sisusbcon_resize,
1302 };
1303 
1304 /* Our very own dummy console driver */
1305 
1306 static const char *sisusbdummycon_startup(void)
1307 {
1308     return "SISUSBVGADUMMY";
1309 }
1310 
1311 static void sisusbdummycon_init(struct vc_data *vc, int init)
1312 {
1313     vc->vc_can_do_color = 1;
1314     if (init) {
1315         vc->vc_cols = 80;
1316         vc->vc_rows = 25;
1317     } else
1318         vc_resize(vc, 80, 25);
1319 }
1320 
1321 static void sisusbdummycon_deinit(struct vc_data *vc) { }
1322 static void sisusbdummycon_clear(struct vc_data *vc, int sy, int sx,
1323                                  int height, int width) { }
1324 static void sisusbdummycon_putc(struct vc_data *vc, int c, int ypos,
1325                                 int xpos) { }
1326 static void sisusbdummycon_putcs(struct vc_data *vc, const unsigned short *s,
1327                                  int count, int ypos, int xpos) { }
1328 static void sisusbdummycon_cursor(struct vc_data *vc, int mode) { }
1329 
1330 static bool sisusbdummycon_scroll(struct vc_data *vc, unsigned int top,
1331                                   unsigned int bottom, enum con_scroll dir,
1332                                   unsigned int lines)
1333 {
1334         return false;
1335 }
1336 
1337 static int sisusbdummycon_switch(struct vc_data *vc)
1338 {
1339         return 0;
1340 }
1341 
1342 static int sisusbdummycon_blank(struct vc_data *vc, int blank, int mode_switch)
1343 {
1344         return 0;
1345 }
1346 
1347 static int sisusbdummycon_font_set(struct vc_data *vc,
1348                                    struct console_font *font,
1349                                    unsigned int flags)
1350 {
1351         return 0;
1352 }
1353 
1354 static int sisusbdummycon_font_default(struct vc_data *vc,
1355                                        struct console_font *font, char *name)
1356 {
1357         return 0;
1358 }
1359 
1360 static int sisusbdummycon_font_copy(struct vc_data *vc, int con)
1361 {
1362         return 0;
1363 }
1364 
1365 static const struct consw sisusb_dummy_con = {
1366         .owner =                THIS_MODULE,
1367         .con_startup =          sisusbdummycon_startup,
1368         .con_init =             sisusbdummycon_init,
1369         .con_deinit =           sisusbdummycon_deinit,
1370         .con_clear =            sisusbdummycon_clear,
1371         .con_putc =             sisusbdummycon_putc,
1372         .con_putcs =            sisusbdummycon_putcs,
1373         .con_cursor =           sisusbdummycon_cursor,
1374         .con_scroll =           sisusbdummycon_scroll,
1375         .con_switch =           sisusbdummycon_switch,
1376         .con_blank =            sisusbdummycon_blank,
1377         .con_font_set =         sisusbdummycon_font_set,
1378         .con_font_default =     sisusbdummycon_font_default,
1379         .con_font_copy =        sisusbdummycon_font_copy,
1380 };
1381 
1382 int
1383 sisusb_console_init(struct sisusb_usb_data *sisusb, int first, int last)
1384 {
1385         int i, ret;
1386 
1387         mutex_lock(&sisusb->lock);
1388 
1389         /* Erm.. that should not happen */
1390         if (sisusb->haveconsole || !sisusb->SiS_Pr) {
1391                 mutex_unlock(&sisusb->lock);
1392                 return 1;
1393         }
1394 
1395         sisusb->con_first = first;
1396         sisusb->con_last  = last;
1397 
1398         if (first > last ||
1399             first > MAX_NR_CONSOLES ||
1400             last > MAX_NR_CONSOLES) {
1401                 mutex_unlock(&sisusb->lock);
1402                 return 1;
1403         }
1404 
1405         /* If gfxcore not initialized or no consoles given, quit graciously */
1406         if (!sisusb->gfxinit || first < 1 || last < 1) {
1407                 mutex_unlock(&sisusb->lock);
1408                 return 0;
1409         }
1410 
1411         sisusb->sisusb_cursor_loc       = -1;
1412         sisusb->sisusb_cursor_size_from = -1;
1413         sisusb->sisusb_cursor_size_to   = -1;
1414 
1415         /* Set up text mode (and upload  default font) */
1416         if (sisusb_reset_text_mode(sisusb, 1)) {
1417                 mutex_unlock(&sisusb->lock);
1418                 dev_err(&sisusb->sisusb_dev->dev, "Failed to set up text mode\n");
1419                 return 1;
1420         }
1421 
1422         /* Initialize some gfx registers */
1423         sisusb_initialize(sisusb);
1424 
1425         for (i = first - 1; i <= last - 1; i++) {
1426                 /* Save sisusb for our interface routines */
1427                 mysisusbs[i] = sisusb;
1428         }
1429 
1430         /* Initial console setup */
1431         sisusb->sisusb_num_columns = 80;
1432 
1433         /* Use a 32K buffer (matches b8000-bffff area) */
1434         sisusb->scrbuf_size = 32 * 1024;
1435 
1436         /* Allocate screen buffer */
1437         if (!(sisusb->scrbuf = (unsigned long)vmalloc(sisusb->scrbuf_size))) {
1438                 mutex_unlock(&sisusb->lock);
1439                 dev_err(&sisusb->sisusb_dev->dev, "Failed to allocate screen buffer\n");
1440                 return 1;
1441         }
1442 
1443         mutex_unlock(&sisusb->lock);
1444 
1445         /* Now grab the desired console(s) */
1446         console_lock();
1447         ret = do_take_over_console(&sisusb_con, first - 1, last - 1, 0);
1448         console_unlock();
1449         if (!ret)
1450                 sisusb->haveconsole = 1;
1451         else {
1452                 for (i = first - 1; i <= last - 1; i++)
1453                         mysisusbs[i] = NULL;
1454         }
1455 
1456         return ret;
1457 }
1458 
1459 void
1460 sisusb_console_exit(struct sisusb_usb_data *sisusb)
1461 {
1462         int i;
1463 
1464         /* This is called if the device is disconnected
1465          * and while disconnect and lock semaphores
1466          * are up. This should be save because we
1467          * can't lose our sisusb any other way but by
1468          * disconnection (and hence, the disconnect
1469          * sema is for protecting all other access
1470          * functions from disconnection, not the
1471          * other way round).
1472          */
1473 
1474         /* Now what do we do in case of disconnection:
1475          * One alternative would be to simply call
1476          * give_up_console(). Nah, not a good idea.
1477          * give_up_console() is obviously buggy as it
1478          * only discards the consw pointer from the
1479          * driver_map, but doesn't adapt vc->vc_sw
1480          * of the affected consoles. Hence, the next
1481          * call to any of the console functions will
1482          * eventually take a trip to oops county.
1483          * Also, give_up_console for some reason
1484          * doesn't decrement our module refcount.
1485          * Instead, we switch our consoles to a private
1486          * dummy console. This, of course, keeps our
1487          * refcount up as well, but it works perfectly.
1488          */
1489 
1490         if (sisusb->haveconsole) {
1491                 for (i = 0; i < MAX_NR_CONSOLES; i++)
1492                         if (sisusb->havethisconsole[i]) {
1493                                 console_lock();
1494                                 do_take_over_console(&sisusb_dummy_con, i, i, 0);
1495                                 console_unlock();
1496                                 /* At this point, con_deinit for all our
1497                                  * consoles is executed by do_take_over_console().
1498                                  */
1499                         }
1500                 sisusb->haveconsole = 0;
1501         }
1502 
1503         vfree((void *)sisusb->scrbuf);
1504         sisusb->scrbuf = 0;
1505 
1506         vfree(sisusb->font_backup);
1507         sisusb->font_backup = NULL;
1508 }
1509 
1510 void __init sisusb_init_concode(void)
1511 {
1512         int i;
1513 
1514         for (i = 0; i < MAX_NR_CONSOLES; i++)
1515                 mysisusbs[i] = NULL;
1516 }
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root/drivers/usb/misc/sisusbvga/sisusb_con.c

DEFINITIONS
