release/src-rt-6.x.4708/linux/linux-2.6.36/drivers/s390/char/keyboard.c

   1 /*
   2  *  drivers/s390/char/keyboard.c
   3  *    ebcdic keycode functions for s390 console drivers
   4  *
   5  *  S390 version
   6  *    Copyright (C) 2003 IBM Deutschland Entwicklung GmbH, IBM Corporation
   7  *    Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com),
   8  */
   9
  10 #include <linux/module.h>
  11 #include <linux/sched.h>
  12 #include <linux/slab.h>
  13 #include <linux/sysrq.h>
  14
  15 #include <linux/consolemap.h>
  16 #include <linux/kbd_kern.h>
  17 #include <linux/kbd_diacr.h>
  18 #include <asm/uaccess.h>
  19
  20 #include "keyboard.h"
  21
  22 /*
  23  * Handler Tables.
  24  */
  25 #define K_HANDLERS\
  26         k_self,         k_fn,           k_spec,         k_ignore,\
  27         k_dead,         k_ignore,       k_ignore,       k_ignore,\
  28         k_ignore,       k_ignore,       k_ignore,       k_ignore,\
  29         k_ignore,       k_ignore,       k_ignore,       k_ignore
  30
  31 typedef void (k_handler_fn)(struct kbd_data *, unsigned char);
  32 static k_handler_fn K_HANDLERS;
  33 static k_handler_fn *k_handler[16] = { K_HANDLERS };
  34
  35 /* maximum values each key_handler can handle */
  36 static const int kbd_max_vals[] = {
  37         255, ARRAY_SIZE(func_table) - 1, NR_FN_HANDLER - 1, 0,
  38         NR_DEAD - 1, 0, 0, 0, 0, 0, 0, 0, 0, 0
  39 };
  40 static const int KBD_NR_TYPES = ARRAY_SIZE(kbd_max_vals);
  41
  42 static unsigned char ret_diacr[NR_DEAD] = {
  43         '`', '\'', '^', '~', '"', ','
  44 };
  45
  46 /*
  47  * Alloc/free of kbd_data structures.
  48  */
  49 struct kbd_data *
  50 kbd_alloc(void) {
  51         struct kbd_data *kbd;
  52         int i;
  53
  54         kbd = kzalloc(sizeof(struct kbd_data), GFP_KERNEL);
  55         if (!kbd)
  56                 goto out;
  57         kbd->key_maps = kzalloc(sizeof(key_maps), GFP_KERNEL);
  58         if (!kbd->key_maps)
  59                 goto out_kbd;
  60         for (i = 0; i < ARRAY_SIZE(key_maps); i++) {
  61                 if (key_maps[i]) {
  62                         kbd->key_maps[i] = kmemdup(key_maps[i],
  63                                                    sizeof(u_short) * NR_KEYS,
  64                                                    GFP_KERNEL);
  65                         if (!kbd->key_maps[i])
  66                                 goto out_maps;
  67                 }
  68         }
  69         kbd->func_table = kzalloc(sizeof(func_table), GFP_KERNEL);
  70         if (!kbd->func_table)
  71                 goto out_maps;
  72         for (i = 0; i < ARRAY_SIZE(func_table); i++) {
  73                 if (func_table[i]) {
  74                         kbd->func_table[i] = kstrdup(func_table[i],
  75                                                      GFP_KERNEL);
  76                         if (!kbd->func_table[i])
  77                                 goto out_func;
  78                 }
  79         }
  80         kbd->fn_handler =
  81                 kzalloc(sizeof(fn_handler_fn *) * NR_FN_HANDLER, GFP_KERNEL);
  82         if (!kbd->fn_handler)
  83                 goto out_func;
  84         kbd->accent_table = kmemdup(accent_table,
  85                                     sizeof(struct kbdiacruc) * MAX_DIACR,
  86                                     GFP_KERNEL);
  87         if (!kbd->accent_table)
  88                 goto out_fn_handler;
  89         kbd->accent_table_size = accent_table_size;
  90         return kbd;
  91
  92 out_fn_handler:
  93         kfree(kbd->fn_handler);
  94 out_func:
  95         for (i = 0; i < ARRAY_SIZE(func_table); i++)
  96                 kfree(kbd->func_table[i]);
  97         kfree(kbd->func_table);
  98 out_maps:
  99         for (i = 0; i < ARRAY_SIZE(key_maps); i++)
 100                 kfree(kbd->key_maps[i]);
 101         kfree(kbd->key_maps);
 102 out_kbd:
 103         kfree(kbd);
 104 out:
 105         return NULL;
 106 }
 107
 108 void
 109 kbd_free(struct kbd_data *kbd)
 110 {
 111         int i;
 112
 113         kfree(kbd->accent_table);
 114         kfree(kbd->fn_handler);
 115         for (i = 0; i < ARRAY_SIZE(func_table); i++)
 116                 kfree(kbd->func_table[i]);
 117         kfree(kbd->func_table);
 118         for (i = 0; i < ARRAY_SIZE(key_maps); i++)
 119                 kfree(kbd->key_maps[i]);
 120         kfree(kbd->key_maps);
 121         kfree(kbd);
 122 }
 123
 124 /*
 125  * Generate ascii -> ebcdic translation table from kbd_data.
 126  */
 127 void
 128 kbd_ascebc(struct kbd_data *kbd, unsigned char *ascebc)
 129 {
 130         unsigned short *keymap, keysym;
 131         int i, j, k;
 132
 133         memset(ascebc, 0x40, 256);
 134         for (i = 0; i < ARRAY_SIZE(key_maps); i++) {
 135                 keymap = kbd->key_maps[i];
 136                 if (!keymap)
 137                         continue;
 138                 for (j = 0; j < NR_KEYS; j++) {
 139                         k = ((i & 1) << 7) + j;
 140                         keysym = keymap[j];
 141                         if (KTYP(keysym) == (KT_LATIN | 0xf0) ||
 142                             KTYP(keysym) == (KT_LETTER | 0xf0))
 143                                 ascebc[KVAL(keysym)] = k;
 144                         else if (KTYP(keysym) == (KT_DEAD | 0xf0))
 145                                 ascebc[ret_diacr[KVAL(keysym)]] = k;
 146                 }
 147         }
 148 }
 149
 150
 151 /*
 152  * We have a combining character DIACR here, followed by the character CH.
 153  * If the combination occurs in the table, return the corresponding value.
 154  * Otherwise, if CH is a space or equals DIACR, return DIACR.
 155  * Otherwise, conclude that DIACR was not combining after all,
 156  * queue it and return CH.
 157  */
 158 static unsigned int
 159 handle_diacr(struct kbd_data *kbd, unsigned int ch)
 160 {
 161         int i, d;
 162
 163         d = kbd->diacr;
 164         kbd->diacr = 0;
 165
 166         for (i = 0; i < kbd->accent_table_size; i++) {
 167                 if (kbd->accent_table[i].diacr == d &&
 168                     kbd->accent_table[i].base == ch)
 169                         return kbd->accent_table[i].result;
 170         }
 171
 172         if (ch == ' ' || ch == d)
 173                 return d;
 174
 175         kbd_put_queue(kbd->tty, d);
 176         return ch;
 177 }
 178
 179 /*
 180  * Handle dead key.
 181  */
 182 static void
 183 k_dead(struct kbd_data *kbd, unsigned char value)
 184 {
 185         value = ret_diacr[value];
 186         kbd->diacr = (kbd->diacr ? handle_diacr(kbd, value) : value);
 187 }
 188
 189 /*
 190  * Normal character handler.
 191  */
 192 static void
 193 k_self(struct kbd_data *kbd, unsigned char value)
 194 {
 195         if (kbd->diacr)
 196                 value = handle_diacr(kbd, value);
 197         kbd_put_queue(kbd->tty, value);
 198 }
 199
 200 /*
 201  * Special key handlers
 202  */
 203 static void
 204 k_ignore(struct kbd_data *kbd, unsigned char value)
 205 {
 206 }
 207
 208 /*
 209  * Function key handler.
 210  */
 211 static void
 212 k_fn(struct kbd_data *kbd, unsigned char value)
 213 {
 214         if (kbd->func_table[value])
 215                 kbd_puts_queue(kbd->tty, kbd->func_table[value]);
 216 }
 217
 218 static void
 219 k_spec(struct kbd_data *kbd, unsigned char value)
 220 {
 221         if (value >= NR_FN_HANDLER)
 222                 return;
 223         if (kbd->fn_handler[value])
 224                 kbd->fn_handler[value](kbd);
 225 }
 226
 227 /*
 228  * Put utf8 character to tty flip buffer.
 229  * UTF-8 is defined for words of up to 31 bits,
 230  * but we need only 16 bits here
 231  */
 232 static void
 233 to_utf8(struct tty_struct *tty, ushort c)
 234 {
 235         if (c < 0x80)
 236                 /*  0******* */
 237                 kbd_put_queue(tty, c);
 238         else if (c < 0x800) {
 239                 /* 110***** 10****** */
 240                 kbd_put_queue(tty, 0xc0 | (c >> 6));
 241                 kbd_put_queue(tty, 0x80 | (c & 0x3f));
 242         } else {
 243                 /* 1110**** 10****** 10****** */
 244                 kbd_put_queue(tty, 0xe0 | (c >> 12));
 245                 kbd_put_queue(tty, 0x80 | ((c >> 6) & 0x3f));
 246                 kbd_put_queue(tty, 0x80 | (c & 0x3f));
 247         }
 248 }
 249
 250 /*
 251  * Process keycode.
 252  */
 253 void
 254 kbd_keycode(struct kbd_data *kbd, unsigned int keycode)
 255 {
 256         unsigned short keysym;
 257         unsigned char type, value;
 258
 259         if (!kbd || !kbd->tty)
 260                 return;
 261
 262         if (keycode >= 384)
 263                 keysym = kbd->key_maps[5][keycode - 384];
 264         else if (keycode >= 256)
 265                 keysym = kbd->key_maps[4][keycode - 256];
 266         else if (keycode >= 128)
 267                 keysym = kbd->key_maps[1][keycode - 128];
 268         else
 269                 keysym = kbd->key_maps[0][keycode];
 270
 271         type = KTYP(keysym);
 272         if (type >= 0xf0) {
 273                 type -= 0xf0;
 274                 if (type == KT_LETTER)
 275                         type = KT_LATIN;
 276                 value = KVAL(keysym);
 277 #ifdef CONFIG_MAGIC_SYSRQ                  /* Handle the SysRq Hack */
 278                 if (kbd->sysrq) {
 279                         if (kbd->sysrq == K(KT_LATIN, '-')) {
 280                                 kbd->sysrq = 0;
 281                                 handle_sysrq(value);
 282                                 return;
 283                         }
 284                         if (value == '-') {
 285                                 kbd->sysrq = K(KT_LATIN, '-');
 286                                 return;
 287                         }
 288                         /* Incomplete sysrq sequence. */
 289                         (*k_handler[KTYP(kbd->sysrq)])(kbd, KVAL(kbd->sysrq));
 290                         kbd->sysrq = 0;
 291                 } else if ((type == KT_LATIN && value == '^') ||
 292                            (type == KT_DEAD && ret_diacr[value] == '^')) {
 293                         kbd->sysrq = K(type, value);
 294                         return;
 295                 }
 296 #endif
 297                 (*k_handler[type])(kbd, value);
 298         } else
 299                 to_utf8(kbd->tty, keysym);
 300 }
 301
 302 /*
 303  * Ioctl stuff.
 304  */
 305 static int
 306 do_kdsk_ioctl(struct kbd_data *kbd, struct kbentry __user *user_kbe,
 307               int cmd, int perm)
 308 {
 309         struct kbentry tmp;
 310         ushort *key_map, val, ov;
 311
 312         if (copy_from_user(&tmp, user_kbe, sizeof(struct kbentry)))
 313                 return -EFAULT;
 314 #if NR_KEYS < 256
 315         if (tmp.kb_index >= NR_KEYS)
 316                 return -EINVAL;
 317 #endif
 318 #if MAX_NR_KEYMAPS < 256
 319         if (tmp.kb_table >= MAX_NR_KEYMAPS)
 320                 return -EINVAL;
 321 #endif
 322
 323         switch (cmd) {
 324         case KDGKBENT:
 325                 key_map = kbd->key_maps[tmp.kb_table];
 326                 if (key_map) {
 327                     val = U(key_map[tmp.kb_index]);
 328                     if (KTYP(val) >= KBD_NR_TYPES)
 329                         val = K_HOLE;
 330                 } else
 331                     val = (tmp.kb_index ? K_HOLE : K_NOSUCHMAP);
 332                 return put_user(val, &user_kbe->kb_value);
 333         case KDSKBENT:
 334                 if (!perm)
 335                         return -EPERM;
 336                 if (!tmp.kb_index && tmp.kb_value == K_NOSUCHMAP) {
 337                         /* disallocate map */
 338                         key_map = kbd->key_maps[tmp.kb_table];
 339                         if (key_map) {
 340                             kbd->key_maps[tmp.kb_table] = NULL;
 341                             kfree(key_map);
 342                         }
 343                         break;
 344                 }
 345
 346                 if (KTYP(tmp.kb_value) >= KBD_NR_TYPES)
 347                         return -EINVAL;
 348                 if (KVAL(tmp.kb_value) > kbd_max_vals[KTYP(tmp.kb_value)])
 349                         return -EINVAL;
 350
 351                 if (!(key_map = kbd->key_maps[tmp.kb_table])) {
 352                         int j;
 353
 354                         key_map = kmalloc(sizeof(plain_map),
 355                                                      GFP_KERNEL);
 356                         if (!key_map)
 357                                 return -ENOMEM;
 358                         kbd->key_maps[tmp.kb_table] = key_map;
 359                         for (j = 0; j < NR_KEYS; j++)
 360                                 key_map[j] = U(K_HOLE);
 361                 }
 362                 ov = U(key_map[tmp.kb_index]);
 363                 if (tmp.kb_value == ov)
 364                         break;  /* nothing to do */
 365                 /*
 366                  * Attention Key.
 367                  */
 368                 if (((ov == K_SAK) || (tmp.kb_value == K_SAK)) &&
 369                     !capable(CAP_SYS_ADMIN))
 370                         return -EPERM;
 371                 key_map[tmp.kb_index] = U(tmp.kb_value);
 372                 break;
 373         }
 374         return 0;
 375 }
 376
 377 static int
 378 do_kdgkb_ioctl(struct kbd_data *kbd, struct kbsentry __user *u_kbs,
 379                int cmd, int perm)
 380 {
 381         unsigned char kb_func;
 382         char *p;
 383         int len;
 384
 385         /* Get u_kbs->kb_func. */
 386         if (get_user(kb_func, &u_kbs->kb_func))
 387                 return -EFAULT;
 388 #if MAX_NR_FUNC < 256
 389         if (kb_func >= MAX_NR_FUNC)
 390                 return -EINVAL;
 391 #endif
 392
 393         switch (cmd) {
 394         case KDGKBSENT:
 395                 p = kbd->func_table[kb_func];
 396                 if (p) {
 397                         len = strlen(p);
 398                         if (len >= sizeof(u_kbs->kb_string))
 399                                 len = sizeof(u_kbs->kb_string) - 1;
 400                         if (copy_to_user(u_kbs->kb_string, p, len))
 401                                 return -EFAULT;
 402                 } else
 403                         len = 0;
 404                 if (put_user('\0', u_kbs->kb_string + len))
 405                         return -EFAULT;
 406                 break;
 407         case KDSKBSENT:
 408                 if (!perm)
 409                         return -EPERM;
 410                 len = strnlen_user(u_kbs->kb_string,
 411                                    sizeof(u_kbs->kb_string) - 1);
 412                 if (!len)
 413                         return -EFAULT;
 414                 if (len > sizeof(u_kbs->kb_string) - 1)
 415                         return -EINVAL;
 416                 p = kmalloc(len + 1, GFP_KERNEL);
 417                 if (!p)
 418                         return -ENOMEM;
 419                 if (copy_from_user(p, u_kbs->kb_string, len)) {
 420                         kfree(p);
 421                         return -EFAULT;
 422                 }
 423                 p[len] = 0;
 424                 kfree(kbd->func_table[kb_func]);
 425                 kbd->func_table[kb_func] = p;
 426                 break;
 427         }
 428         return 0;
 429 }
 430
 431 int
 432 kbd_ioctl(struct kbd_data *kbd, struct file *file,
 433           unsigned int cmd, unsigned long arg)
 434 {
 435         void __user *argp;
 436         int ct, perm;
 437
 438         argp = (void __user *)arg;
 439
 440         /*
 441          * To have permissions to do most of the vt ioctls, we either have
 442          * to be the owner of the tty, or have CAP_SYS_TTY_CONFIG.
 443          */
 444         perm = current->signal->tty == kbd->tty || capable(CAP_SYS_TTY_CONFIG);
 445         switch (cmd) {
 446         case KDGKBTYPE:
 447                 return put_user(KB_101, (char __user *)argp);
 448         case KDGKBENT:
 449         case KDSKBENT:
 450                 return do_kdsk_ioctl(kbd, argp, cmd, perm);
 451         case KDGKBSENT:
 452         case KDSKBSENT:
 453                 return do_kdgkb_ioctl(kbd, argp, cmd, perm);
 454         case KDGKBDIACR:
 455         {
 456                 struct kbdiacrs __user *a = argp;
 457                 struct kbdiacr diacr;
 458                 int i;
 459
 460                 if (put_user(kbd->accent_table_size, &a->kb_cnt))
 461                         return -EFAULT;
 462                 for (i = 0; i < kbd->accent_table_size; i++) {
 463                         diacr.diacr = kbd->accent_table[i].diacr;
 464                         diacr.base = kbd->accent_table[i].base;
 465                         diacr.result = kbd->accent_table[i].result;
 466                         if (copy_to_user(a->kbdiacr + i, &diacr, sizeof(struct kbdiacr)))
 467                         return -EFAULT;
 468                 }
 469                 return 0;
 470         }
 471         case KDGKBDIACRUC:
 472         {
 473                 struct kbdiacrsuc __user *a = argp;
 474
 475                 ct = kbd->accent_table_size;
 476                 if (put_user(ct, &a->kb_cnt))
 477                         return -EFAULT;
 478                 if (copy_to_user(a->kbdiacruc, kbd->accent_table,
 479                                  ct * sizeof(struct kbdiacruc)))
 480                         return -EFAULT;
 481                 return 0;
 482         }
 483         case KDSKBDIACR:
 484         {
 485                 struct kbdiacrs __user *a = argp;
 486                 struct kbdiacr diacr;
 487                 int i;
 488
 489                 if (!perm)
 490                         return -EPERM;
 491                 if (get_user(ct, &a->kb_cnt))
 492                         return -EFAULT;
 493                 if (ct >= MAX_DIACR)
 494                         return -EINVAL;
 495                 kbd->accent_table_size = ct;
 496                 for (i = 0; i < ct; i++) {
 497                         if (copy_from_user(&diacr, a->kbdiacr + i, sizeof(struct kbdiacr)))
 498                                 return -EFAULT;
 499                         kbd->accent_table[i].diacr = diacr.diacr;
 500                         kbd->accent_table[i].base = diacr.base;
 501                         kbd->accent_table[i].result = diacr.result;
 502                 }
 503                 return 0;
 504         }
 505         case KDSKBDIACRUC:
 506         {
 507                 struct kbdiacrsuc __user *a = argp;
 508
 509                 if (!perm)
 510                         return -EPERM;
 511                 if (get_user(ct, &a->kb_cnt))
 512                         return -EFAULT;
 513                 if (ct >= MAX_DIACR)
 514                         return -EINVAL;
 515                 kbd->accent_table_size = ct;
 516                 if (copy_from_user(kbd->accent_table, a->kbdiacruc,
 517                                    ct * sizeof(struct kbdiacruc)))
 518                         return -EFAULT;
 519                 return 0;
 520         }
 521         default:
 522                 return -ENOIOCTLCMD;
 523         }
 524 }
 525
 526 EXPORT_SYMBOL(kbd_ioctl);
 527 EXPORT_SYMBOL(kbd_ascebc);
 528 EXPORT_SYMBOL(kbd_free);
 529 EXPORT_SYMBOL(kbd_alloc);
 530 EXPORT_SYMBOL(kbd_keycode);