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