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/sysrq.h>
  13
  14 #include <linux/consolemap.h>
  15 #include <linux/kbd_kern.h>
  16 #include <linux/kbd_diacr.h>
  17 #include <asm/uaccess.h>
  18
  19 #include "keyboard.h"
  20
  21 /*
  22  * Handler Tables.
  23  */
  24 #define K_HANDLERS\
  25         k_self,         k_fn,           k_spec,         k_ignore,\
  26         k_dead,         k_ignore,       k_ignore,       k_ignore,\
  27         k_ignore,       k_ignore,       k_ignore,       k_ignore,\
  28         k_ignore,       k_ignore,       k_ignore,       k_ignore
  29
  30 typedef void (k_handler_fn)(struct kbd_data *, unsigned char);
  31 static k_handler_fn K_HANDLERS;
  32 static k_handler_fn *k_handler[16] = { K_HANDLERS };
  33
  34 /* maximum values each key_handler can handle */
  35 static const int kbd_max_vals[] = {
  36         255, ARRAY_SIZE(func_table) - 1, NR_FN_HANDLER - 1, 0,
  37         NR_DEAD - 1, 0, 0, 0, 0, 0, 0, 0, 0, 0
  38 };
  39 static const int KBD_NR_TYPES = ARRAY_SIZE(kbd_max_vals);
  40
  41 static unsigned char ret_diacr[NR_DEAD] = {
  42         '`', '\'', '^', '~', '"', ','
  43 };
  44
  45 /*
  46  * Alloc/free of kbd_data structures.
  47  */
  48 struct kbd_data *
  49 kbd_alloc(void) {
  50         struct kbd_data *kbd;
  51         int i, len;
  52
  53         kbd = kzalloc(sizeof(struct kbd_data), GFP_KERNEL);
  54         if (!kbd)
  55                 goto out;
  56         kbd->key_maps = kzalloc(sizeof(key_maps), GFP_KERNEL);
  57         if (!kbd->key_maps)
  58                 goto out_kbd;
  59         for (i = 0; i < ARRAY_SIZE(key_maps); i++) {
  60                 if (key_maps[i]) {
  61                         kbd->key_maps[i] =
  62                                 kmalloc(sizeof(u_short)*NR_KEYS, GFP_KERNEL);
  63                         if (!kbd->key_maps[i])
  64                                 goto out_maps;
  65                         memcpy(kbd->key_maps[i], key_maps[i],
  66                                sizeof(u_short)*NR_KEYS);
  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                         len = strlen(func_table[i]) + 1;
  75                         kbd->func_table[i] = kmalloc(len, GFP_KERNEL);
  76                         if (!kbd->func_table[i])
  77                                 goto out_func;
  78                         memcpy(kbd->func_table[i], func_table[i], len);
  79                 }
  80         }
  81         kbd->fn_handler =
  82                 kzalloc(sizeof(fn_handler_fn *) * NR_FN_HANDLER, GFP_KERNEL);
  83         if (!kbd->fn_handler)
  84                 goto out_func;
  85         kbd->accent_table =
  86                 kmalloc(sizeof(struct kbdiacruc)*MAX_DIACR, GFP_KERNEL);
  87         if (!kbd->accent_table)
  88                 goto out_fn_handler;
  89         memcpy(kbd->accent_table, accent_table,
  90                sizeof(struct kbdiacruc)*MAX_DIACR);
  91         kbd->accent_table_size = accent_table_size;
  92         return kbd;
  93
  94 out_fn_handler:
  95         kfree(kbd->fn_handler);
  96 out_func:
  97         for (i = 0; i < ARRAY_SIZE(func_table); i++)
  98                 kfree(kbd->func_table[i]);
  99         kfree(kbd->func_table);
 100 out_maps:
 101         for (i = 0; i < ARRAY_SIZE(key_maps); i++)
 102                 kfree(kbd->key_maps[i]);
 103         kfree(kbd->key_maps);
 104 out_kbd:
 105         kfree(kbd);
 106 out:
 107         return NULL;
 108 }
 109
 110 void
 111 kbd_free(struct kbd_data *kbd)
 112 {
 113         int i;
 114
 115         kfree(kbd->accent_table);
 116         kfree(kbd->fn_handler);
 117         for (i = 0; i < ARRAY_SIZE(func_table); i++)
 118                 kfree(kbd->func_table[i]);
 119         kfree(kbd->func_table);
 120         for (i = 0; i < ARRAY_SIZE(key_maps); i++)
 121                 kfree(kbd->key_maps[i]);
 122         kfree(kbd->key_maps);
 123         kfree(kbd);
 124 }
 125
 126 /*
 127  * Generate ascii -> ebcdic translation table from kbd_data.
 128  */
 129 void
 130 kbd_ascebc(struct kbd_data *kbd, unsigned char *ascebc)
 131 {
 132         unsigned short *keymap, keysym;
 133         int i, j, k;
 134
 135         memset(ascebc, 0x40, 256);
 136         for (i = 0; i < ARRAY_SIZE(key_maps); i++) {
 137                 keymap = kbd->key_maps[i];
 138                 if (!keymap)
 139                         continue;
 140                 for (j = 0; j < NR_KEYS; j++) {
 141                         k = ((i & 1) << 7) + j;
 142                         keysym = keymap[j];
 143                         if (KTYP(keysym) == (KT_LATIN | 0xf0) ||
 144                             KTYP(keysym) == (KT_LETTER | 0xf0))
 145                                 ascebc[KVAL(keysym)] = k;
 146                         else if (KTYP(keysym) == (KT_DEAD | 0xf0))
 147                                 ascebc[ret_diacr[KVAL(keysym)]] = k;
 148                 }
 149         }
 150 }
 151
 152 #if 0
 153 /*
 154  * Generate ebcdic -> ascii translation table from kbd_data.
 155  */
 156 void
 157 kbd_ebcasc(struct kbd_data *kbd, unsigned char *ebcasc)
 158 {
 159         unsigned short *keymap, keysym;
 160         int i, j, k;
 161
 162         memset(ebcasc, ' ', 256);
 163         for (i = 0; i < ARRAY_SIZE(key_maps); i++) {
 164                 keymap = kbd->key_maps[i];
 165                 if (!keymap)
 166                         continue;
 167                 for (j = 0; j < NR_KEYS; j++) {
 168                         keysym = keymap[j];
 169                         k = ((i & 1) << 7) + j;
 170                         if (KTYP(keysym) == (KT_LATIN | 0xf0) ||
 171                             KTYP(keysym) == (KT_LETTER | 0xf0))
 172                                 ebcasc[k] = KVAL(keysym);
 173                         else if (KTYP(keysym) == (KT_DEAD | 0xf0))
 174                                 ebcasc[k] = ret_diacr[KVAL(keysym)];
 175                 }
 176         }
 177 }
 178 #endif
 179
 180 /*
 181  * We have a combining character DIACR here, followed by the character CH.
 182  * If the combination occurs in the table, return the corresponding value.
 183  * Otherwise, if CH is a space or equals DIACR, return DIACR.
 184  * Otherwise, conclude that DIACR was not combining after all,
 185  * queue it and return CH.
 186  */
 187 static unsigned int
 188 handle_diacr(struct kbd_data *kbd, unsigned int ch)
 189 {
 190         int i, d;
 191
 192         d = kbd->diacr;
 193         kbd->diacr = 0;
 194
 195         for (i = 0; i < kbd->accent_table_size; i++) {
 196                 if (kbd->accent_table[i].diacr == d &&
 197                     kbd->accent_table[i].base == ch)
 198                         return kbd->accent_table[i].result;
 199         }
 200
 201         if (ch == ' ' || ch == d)
 202                 return d;
 203
 204         kbd_put_queue(kbd->tty, d);
 205         return ch;
 206 }
 207
 208 /*
 209  * Handle dead key.
 210  */
 211 static void
 212 k_dead(struct kbd_data *kbd, unsigned char value)
 213 {
 214         value = ret_diacr[value];
 215         kbd->diacr = (kbd->diacr ? handle_diacr(kbd, value) : value);
 216 }
 217
 218 /*
 219  * Normal character handler.
 220  */
 221 static void
 222 k_self(struct kbd_data *kbd, unsigned char value)
 223 {
 224         if (kbd->diacr)
 225                 value = handle_diacr(kbd, value);
 226         kbd_put_queue(kbd->tty, value);
 227 }
 228
 229 /*
 230  * Special key handlers
 231  */
 232 static void
 233 k_ignore(struct kbd_data *kbd, unsigned char value)
 234 {
 235 }
 236
 237 /*
 238  * Function key handler.
 239  */
 240 static void
 241 k_fn(struct kbd_data *kbd, unsigned char value)
 242 {
 243         if (kbd->func_table[value])
 244                 kbd_puts_queue(kbd->tty, kbd->func_table[value]);
 245 }
 246
 247 static void
 248 k_spec(struct kbd_data *kbd, unsigned char value)
 249 {
 250         if (value >= NR_FN_HANDLER)
 251                 return;
 252         if (kbd->fn_handler[value])
 253                 kbd->fn_handler[value](kbd);
 254 }
 255
 256 /*
 257  * Put utf8 character to tty flip buffer.
 258  * UTF-8 is defined for words of up to 31 bits,
 259  * but we need only 16 bits here
 260  */
 261 static void
 262 to_utf8(struct tty_struct *tty, ushort c)
 263 {
 264         if (c < 0x80)
 265                 /*  0******* */
 266                 kbd_put_queue(tty, c);
 267         else if (c < 0x800) {
 268                 /* 110***** 10****** */
 269                 kbd_put_queue(tty, 0xc0 | (c >> 6));
 270                 kbd_put_queue(tty, 0x80 | (c & 0x3f));
 271         } else {
 272                 /* 1110**** 10****** 10****** */
 273                 kbd_put_queue(tty, 0xe0 | (c >> 12));
 274                 kbd_put_queue(tty, 0x80 | ((c >> 6) & 0x3f));
 275                 kbd_put_queue(tty, 0x80 | (c & 0x3f));
 276         }
 277 }
 278
 279 /*
 280  * Process keycode.
 281  */
 282 void
 283 kbd_keycode(struct kbd_data *kbd, unsigned int keycode)
 284 {
 285         unsigned short keysym;
 286         unsigned char type, value;
 287
 288         if (!kbd || !kbd->tty)
 289                 return;
 290
 291         if (keycode >= 384)
 292                 keysym = kbd->key_maps[5][keycode - 384];
 293         else if (keycode >= 256)
 294                 keysym = kbd->key_maps[4][keycode - 256];
 295         else if (keycode >= 128)
 296                 keysym = kbd->key_maps[1][keycode - 128];
 297         else
 298                 keysym = kbd->key_maps[0][keycode];
 299
 300         type = KTYP(keysym);
 301         if (type >= 0xf0) {
 302                 type -= 0xf0;
 303                 if (type == KT_LETTER)
 304                         type = KT_LATIN;
 305                 value = KVAL(keysym);
 306 #ifdef CONFIG_MAGIC_SYSRQ              /* Handle the SysRq Hack */
 307                 if (kbd->sysrq) {
 308                         if (kbd->sysrq == K(KT_LATIN, '-')) {
 309                                 kbd->sysrq = 0;
 310                                 handle_sysrq(value, kbd->tty);
 311                                 return;
 312                         }
 313                         if (value == '-') {
 314                                 kbd->sysrq = K(KT_LATIN, '-');
 315                                 return;
 316                         }
 317                         /* Incomplete sysrq sequence. */
 318                         (*k_handler[KTYP(kbd->sysrq)])(kbd, KVAL(kbd->sysrq));
 319                         kbd->sysrq = 0;
 320                 } else if ((type == KT_LATIN && value == '^') ||
 321                            (type == KT_DEAD && ret_diacr[value] == '^')) {
 322                         kbd->sysrq = K(type, value);
 323                         return;
 324                 }
 325 #endif
 326                 (*k_handler[type])(kbd, value);
 327         } else
 328                 to_utf8(kbd->tty, keysym);
 329 }
 330
 331 /*
 332  * Ioctl stuff.
 333  */
 334 static int
 335 do_kdsk_ioctl(struct kbd_data *kbd, struct kbentry __user *user_kbe,
 336               int cmd, int perm)
 337 {
 338         struct kbentry tmp;
 339         ushort *key_map, val, ov;
 340
 341         if (copy_from_user(&tmp, user_kbe, sizeof(struct kbentry)))
 342                 return -EFAULT;
 343 #if NR_KEYS < 256
 344         if (tmp.kb_index >= NR_KEYS)
 345                 return -EINVAL;
 346 #endif
 347 #if MAX_NR_KEYMAPS < 256
 348         if (tmp.kb_table >= MAX_NR_KEYMAPS)
 349                 return -EINVAL;
 350 #endif
 351
 352         switch (cmd) {
 353         case KDGKBENT:
 354                 key_map = kbd->key_maps[tmp.kb_table];
 355                 if (key_map) {
 356                     val = U(key_map[tmp.kb_index]);
 357                     if (KTYP(val) >= KBD_NR_TYPES)
 358                         val = K_HOLE;
 359                 } else
 360                     val = (tmp.kb_index ? K_HOLE : K_NOSUCHMAP);
 361                 return put_user(val, &user_kbe->kb_value);
 362         case KDSKBENT:
 363                 if (!perm)
 364                         return -EPERM;
 365                 if (!tmp.kb_index && tmp.kb_value == K_NOSUCHMAP) {
 366                         /* disallocate map */
 367                         key_map = kbd->key_maps[tmp.kb_table];
 368                         if (key_map) {
 369                             kbd->key_maps[tmp.kb_table] = NULL;
 370                             kfree(key_map);
 371                         }
 372                         break;
 373                 }
 374
 375                 if (KTYP(tmp.kb_value) >= KBD_NR_TYPES)
 376                         return -EINVAL;
 377                 if (KVAL(tmp.kb_value) > kbd_max_vals[KTYP(tmp.kb_value)])
 378                         return -EINVAL;
 379
 380                 if (!(key_map = kbd->key_maps[tmp.kb_table])) {
 381                         int j;
 382
 383                         key_map = kmalloc(sizeof(plain_map),
 384                                                      GFP_KERNEL);
 385                         if (!key_map)
 386                                 return -ENOMEM;
 387                         kbd->key_maps[tmp.kb_table] = key_map;
 388                         for (j = 0; j < NR_KEYS; j++)
 389                                 key_map[j] = U(K_HOLE);
 390                 }
 391                 ov = U(key_map[tmp.kb_index]);
 392                 if (tmp.kb_value == ov)
 393                         break;  /* nothing to do */
 394                 /*
 395                  * Attention Key.
 396                  */
 397                 if (((ov == K_SAK) || (tmp.kb_value == K_SAK)) &&
 398                     !capable(CAP_SYS_ADMIN))
 399                         return -EPERM;
 400                 key_map[tmp.kb_index] = U(tmp.kb_value);
 401                 break;
 402         }
 403         return 0;
 404 }
 405
 406 static int
 407 do_kdgkb_ioctl(struct kbd_data *kbd, struct kbsentry __user *u_kbs,
 408                int cmd, int perm)
 409 {
 410         unsigned char kb_func;
 411         char *p;
 412         int len;
 413
 414         /* Get u_kbs->kb_func. */
 415         if (get_user(kb_func, &u_kbs->kb_func))
 416                 return -EFAULT;
 417 #if MAX_NR_FUNC < 256
 418         if (kb_func >= MAX_NR_FUNC)
 419                 return -EINVAL;
 420 #endif
 421
 422         switch (cmd) {
 423         case KDGKBSENT:
 424                 p = kbd->func_table[kb_func];
 425                 if (p) {
 426                         len = strlen(p);
 427                         if (len >= sizeof(u_kbs->kb_string))
 428                                 len = sizeof(u_kbs->kb_string) - 1;
 429                         if (copy_to_user(u_kbs->kb_string, p, len))
 430                                 return -EFAULT;
 431                 } else
 432                         len = 0;
 433                 if (put_user('\0', u_kbs->kb_string + len))
 434                         return -EFAULT;
 435                 break;
 436         case KDSKBSENT:
 437                 if (!perm)
 438                         return -EPERM;
 439                 len = strnlen_user(u_kbs->kb_string,
 440                                    sizeof(u_kbs->kb_string) - 1);
 441                 if (!len)
 442                         return -EFAULT;
 443                 if (len > sizeof(u_kbs->kb_string) - 1)
 444                         return -EINVAL;
 445                 p = kmalloc(len + 1, GFP_KERNEL);
 446                 if (!p)
 447                         return -ENOMEM;
 448                 if (copy_from_user(p, u_kbs->kb_string, len)) {
 449                         kfree(p);
 450                         return -EFAULT;
 451                 }
 452                 p[len] = 0;
 453                 kfree(kbd->func_table[kb_func]);
 454                 kbd->func_table[kb_func] = p;
 455                 break;
 456         }
 457         return 0;
 458 }
 459
 460 int
 461 kbd_ioctl(struct kbd_data *kbd, struct file *file,
 462           unsigned int cmd, unsigned long arg)
 463 {
 464         void __user *argp;
 465         int ct, perm;
 466
 467         argp = (void __user *)arg;
 468
 469         /*
 470          * To have permissions to do most of the vt ioctls, we either have
 471          * to be the owner of the tty, or have CAP_SYS_TTY_CONFIG.
 472          */
 473         perm = current->signal->tty == kbd->tty || capable(CAP_SYS_TTY_CONFIG);
 474         switch (cmd) {
 475         case KDGKBTYPE:
 476                 return put_user(KB_101, (char __user *)argp);
 477         case KDGKBENT:
 478         case KDSKBENT:
 479                 return do_kdsk_ioctl(kbd, argp, cmd, perm);
 480         case KDGKBSENT:
 481         case KDSKBSENT:
 482                 return do_kdgkb_ioctl(kbd, argp, cmd, perm);
 483         case KDGKBDIACR:
 484         {
 485                 struct kbdiacrs __user *a = argp;
 486                 struct kbdiacr diacr;
 487                 int i;
 488
 489                 if (put_user(kbd->accent_table_size, &a->kb_cnt))
 490                         return -EFAULT;
 491                 for (i = 0; i < kbd->accent_table_size; i++) {
 492                         diacr.diacr = kbd->accent_table[i].diacr;
 493                         diacr.base = kbd->accent_table[i].base;
 494                         diacr.result = kbd->accent_table[i].result;
 495                         if (copy_to_user(a->kbdiacr + i, &diacr, sizeof(struct kbdiacr)))
 496                         return -EFAULT;
 497                 }
 498                 return 0;
 499         }
 500         case KDGKBDIACRUC:
 501         {
 502                 struct kbdiacrsuc __user *a = argp;
 503
 504                 ct = kbd->accent_table_size;
 505                 if (put_user(ct, &a->kb_cnt))
 506                         return -EFAULT;
 507                 if (copy_to_user(a->kbdiacruc, kbd->accent_table,
 508                                  ct * sizeof(struct kbdiacruc)))
 509                         return -EFAULT;
 510                 return 0;
 511         }
 512         case KDSKBDIACR:
 513         {
 514                 struct kbdiacrs __user *a = argp;
 515                 struct kbdiacr diacr;
 516                 int i;
 517
 518                 if (!perm)
 519                         return -EPERM;
 520                 if (get_user(ct, &a->kb_cnt))
 521                         return -EFAULT;
 522                 if (ct >= MAX_DIACR)
 523                         return -EINVAL;
 524                 kbd->accent_table_size = ct;
 525                 for (i = 0; i < ct; i++) {
 526                         if (copy_from_user(&diacr, a->kbdiacr + i, sizeof(struct kbdiacr)))
 527                                 return -EFAULT;
 528                         kbd->accent_table[i].diacr = diacr.diacr;
 529                         kbd->accent_table[i].base = diacr.base;
 530                         kbd->accent_table[i].result = diacr.result;
 531                 }
 532                 return 0;
 533         }
 534         case KDSKBDIACRUC:
 535         {
 536                 struct kbdiacrsuc __user *a = argp;
 537
 538                 if (!perm)
 539                         return -EPERM;
 540                 if (get_user(ct, &a->kb_cnt))
 541                         return -EFAULT;
 542                 if (ct >= MAX_DIACR)
 543                         return -EINVAL;
 544                 kbd->accent_table_size = ct;
 545                 if (copy_from_user(kbd->accent_table, a->kbdiacruc,
 546                                    ct * sizeof(struct kbdiacruc)))
 547                         return -EFAULT;
 548                 return 0;
 549         }
 550         default:
 551                 return -ENOIOCTLCMD;
 552         }
 553 }
 554
 555 EXPORT_SYMBOL(kbd_ioctl);
 556 EXPORT_SYMBOL(kbd_ascebc);
 557 EXPORT_SYMBOL(kbd_free);
 558 EXPORT_SYMBOL(kbd_alloc);
 559 EXPORT_SYMBOL(kbd_keycode);