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treewide: remove redundant IS_ERR() before error code check
[linux/fpc-iii.git] / drivers / s390 / char / keyboard.c
blob567aedc03c76332895e34d0704f83f74aad9de0e
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * ebcdic keycode functions for s390 console drivers
4 *
5 * S390 version
6 * Copyright IBM Corp. 2003
7 * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com),
8 */
9
10 #include <linux/module.h>
11 #include <linux/sched/signal.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 <linux/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 const unsigned char ret_diacr[NR_DEAD] = {
43 '`', /* dead_grave */
44 '\'', /* dead_acute */
45 '^', /* dead_circumflex */
46 '~', /* dead_tilda */
47 '"', /* dead_diaeresis */
48 ',', /* dead_cedilla */
49 '_', /* dead_macron */
50 'U', /* dead_breve */
51 '.', /* dead_abovedot */
52 '*', /* dead_abovering */
53 '=', /* dead_doubleacute */
54 'c', /* dead_caron */
55 'k', /* dead_ogonek */
56 'i', /* dead_iota */
57 '#', /* dead_voiced_sound */
58 'o', /* dead_semivoiced_sound */
59 '!', /* dead_belowdot */
60 '?', /* dead_hook */
61 '+', /* dead_horn */
62 '-', /* dead_stroke */
63 ')', /* dead_abovecomma */
64 '(', /* dead_abovereversedcomma */
65 ':', /* dead_doublegrave */
66 'n', /* dead_invertedbreve */
67 ';', /* dead_belowcomma */
68 '$', /* dead_currency */
69 '@', /* dead_greek */
70 };
71
72 /*
73 * Alloc/free of kbd_data structures.
74 */
75 struct kbd_data *
76 kbd_alloc(void) {
77 struct kbd_data *kbd;
78 int i;
79
80 kbd = kzalloc(sizeof(struct kbd_data), GFP_KERNEL);
81 if (!kbd)
82 goto out;
83 kbd->key_maps = kzalloc(sizeof(ebc_key_maps), GFP_KERNEL);
84 if (!kbd->key_maps)
85 goto out_kbd;
86 for (i = 0; i < ARRAY_SIZE(ebc_key_maps); i++) {
87 if (ebc_key_maps[i]) {
88 kbd->key_maps[i] = kmemdup(ebc_key_maps[i],
89 sizeof(u_short) * NR_KEYS,
90 GFP_KERNEL);
91 if (!kbd->key_maps[i])
92 goto out_maps;
93 }
94 }
95 kbd->func_table = kzalloc(sizeof(ebc_func_table), GFP_KERNEL);
96 if (!kbd->func_table)
97 goto out_maps;
98 for (i = 0; i < ARRAY_SIZE(ebc_func_table); i++) {
99 if (ebc_func_table[i]) {
100 kbd->func_table[i] = kstrdup(ebc_func_table[i],
101 GFP_KERNEL);
102 if (!kbd->func_table[i])
103 goto out_func;
104 }
105 }
106 kbd->fn_handler =
107 kcalloc(NR_FN_HANDLER, sizeof(fn_handler_fn *), GFP_KERNEL);
108 if (!kbd->fn_handler)
109 goto out_func;
110 kbd->accent_table = kmemdup(ebc_accent_table,
111 sizeof(struct kbdiacruc) * MAX_DIACR,
112 GFP_KERNEL);
113 if (!kbd->accent_table)
114 goto out_fn_handler;
115 kbd->accent_table_size = ebc_accent_table_size;
116 return kbd;
117
118 out_fn_handler:
119 kfree(kbd->fn_handler);
120 out_func:
121 for (i = 0; i < ARRAY_SIZE(ebc_func_table); i++)
122 kfree(kbd->func_table[i]);
123 kfree(kbd->func_table);
124 out_maps:
125 for (i = 0; i < ARRAY_SIZE(ebc_key_maps); i++)
126 kfree(kbd->key_maps[i]);
127 kfree(kbd->key_maps);
128 out_kbd:
129 kfree(kbd);
130 out:
131 return NULL;
132 }
133
134 void
135 kbd_free(struct kbd_data *kbd)
136 {
137 int i;
138
139 kfree(kbd->accent_table);
140 kfree(kbd->fn_handler);
141 for (i = 0; i < ARRAY_SIZE(ebc_func_table); i++)
142 kfree(kbd->func_table[i]);
143 kfree(kbd->func_table);
144 for (i = 0; i < ARRAY_SIZE(ebc_key_maps); i++)
145 kfree(kbd->key_maps[i]);
146 kfree(kbd->key_maps);
147 kfree(kbd);
148 }
149
150 /*
151 * Generate ascii -> ebcdic translation table from kbd_data.
152 */
153 void
154 kbd_ascebc(struct kbd_data *kbd, unsigned char *ascebc)
155 {
156 unsigned short *keymap, keysym;
157 int i, j, k;
158
159 memset(ascebc, 0x40, 256);
160 for (i = 0; i < ARRAY_SIZE(ebc_key_maps); i++) {
161 keymap = kbd->key_maps[i];
162 if (!keymap)
163 continue;
164 for (j = 0; j < NR_KEYS; j++) {
165 k = ((i & 1) << 7) + j;
166 keysym = keymap[j];
167 if (KTYP(keysym) == (KT_LATIN | 0xf0) ||
168 KTYP(keysym) == (KT_LETTER | 0xf0))
169 ascebc[KVAL(keysym)] = k;
170 else if (KTYP(keysym) == (KT_DEAD | 0xf0))
171 ascebc[ret_diacr[KVAL(keysym)]] = k;
172 }
173 }
174 }
175
176 #if 0
177 /*
178 * Generate ebcdic -> ascii translation table from kbd_data.
179 */
180 void
181 kbd_ebcasc(struct kbd_data *kbd, unsigned char *ebcasc)
182 {
183 unsigned short *keymap, keysym;
184 int i, j, k;
185
186 memset(ebcasc, ' ', 256);
187 for (i = 0; i < ARRAY_SIZE(ebc_key_maps); i++) {
188 keymap = kbd->key_maps[i];
189 if (!keymap)
190 continue;
191 for (j = 0; j < NR_KEYS; j++) {
192 keysym = keymap[j];
193 k = ((i & 1) << 7) + j;
194 if (KTYP(keysym) == (KT_LATIN | 0xf0) ||
195 KTYP(keysym) == (KT_LETTER | 0xf0))
196 ebcasc[k] = KVAL(keysym);
197 else if (KTYP(keysym) == (KT_DEAD | 0xf0))
198 ebcasc[k] = ret_diacr[KVAL(keysym)];
199 }
200 }
201 }
202 #endif
203
204 /*
205 * We have a combining character DIACR here, followed by the character CH.
206 * If the combination occurs in the table, return the corresponding value.
207 * Otherwise, if CH is a space or equals DIACR, return DIACR.
208 * Otherwise, conclude that DIACR was not combining after all,
209 * queue it and return CH.
210 */
211 static unsigned int
212 handle_diacr(struct kbd_data *kbd, unsigned int ch)
213 {
214 int i, d;
215
216 d = kbd->diacr;
217 kbd->diacr = 0;
218
219 for (i = 0; i < kbd->accent_table_size; i++) {
220 if (kbd->accent_table[i].diacr == d &&
221 kbd->accent_table[i].base == ch)
222 return kbd->accent_table[i].result;
223 }
224
225 if (ch == ' ' || ch == d)
226 return d;
227
228 kbd_put_queue(kbd->port, d);
229 return ch;
230 }
231
232 /*
233 * Handle dead key.
234 */
235 static void
236 k_dead(struct kbd_data *kbd, unsigned char value)
237 {
238 value = ret_diacr[value];
239 kbd->diacr = (kbd->diacr ? handle_diacr(kbd, value) : value);
240 }
241
242 /*
243 * Normal character handler.
244 */
245 static void
246 k_self(struct kbd_data *kbd, unsigned char value)
247 {
248 if (kbd->diacr)
249 value = handle_diacr(kbd, value);
250 kbd_put_queue(kbd->port, value);
251 }
252
253 /*
254 * Special key handlers
255 */
256 static void
257 k_ignore(struct kbd_data *kbd, unsigned char value)
258 {
259 }
260
261 /*
262 * Function key handler.
263 */
264 static void
265 k_fn(struct kbd_data *kbd, unsigned char value)
266 {
267 if (kbd->func_table[value])
268 kbd_puts_queue(kbd->port, kbd->func_table[value]);
269 }
270
271 static void
272 k_spec(struct kbd_data *kbd, unsigned char value)
273 {
274 if (value >= NR_FN_HANDLER)
275 return;
276 if (kbd->fn_handler[value])
277 kbd->fn_handler[value](kbd);
278 }
279
280 /*
281 * Put utf8 character to tty flip buffer.
282 * UTF-8 is defined for words of up to 31 bits,
283 * but we need only 16 bits here
284 */
285 static void
286 to_utf8(struct tty_port *port, ushort c)
287 {
288 if (c < 0x80)
289 /* 0******* */
290 kbd_put_queue(port, c);
291 else if (c < 0x800) {
292 /* 110***** 10****** */
293 kbd_put_queue(port, 0xc0 | (c >> 6));
294 kbd_put_queue(port, 0x80 | (c & 0x3f));
295 } else {
296 /* 1110**** 10****** 10****** */
297 kbd_put_queue(port, 0xe0 | (c >> 12));
298 kbd_put_queue(port, 0x80 | ((c >> 6) & 0x3f));
299 kbd_put_queue(port, 0x80 | (c & 0x3f));
300 }
301 }
302
303 /*
304 * Process keycode.
305 */
306 void
307 kbd_keycode(struct kbd_data *kbd, unsigned int keycode)
308 {
309 unsigned short keysym;
310 unsigned char type, value;
311
312 if (!kbd)
313 return;
314
315 if (keycode >= 384)
316 keysym = kbd->key_maps[5][keycode - 384];
317 else if (keycode >= 256)
318 keysym = kbd->key_maps[4][keycode - 256];
319 else if (keycode >= 128)
320 keysym = kbd->key_maps[1][keycode - 128];
321 else
322 keysym = kbd->key_maps[0][keycode];
323
324 type = KTYP(keysym);
325 if (type >= 0xf0) {
326 type -= 0xf0;
327 if (type == KT_LETTER)
328 type = KT_LATIN;
329 value = KVAL(keysym);
330 #ifdef CONFIG_MAGIC_SYSRQ /* Handle the SysRq Hack */
331 if (kbd->sysrq) {
332 if (kbd->sysrq == K(KT_LATIN, '-')) {
333 kbd->sysrq = 0;
334 handle_sysrq(value);
335 return;
336 }
337 if (value == '-') {
338 kbd->sysrq = K(KT_LATIN, '-');
339 return;
340 }
341 /* Incomplete sysrq sequence. */
342 (*k_handler[KTYP(kbd->sysrq)])(kbd, KVAL(kbd->sysrq));
343 kbd->sysrq = 0;
344 } else if ((type == KT_LATIN && value == '^') ||
345 (type == KT_DEAD && ret_diacr[value] == '^')) {
346 kbd->sysrq = K(type, value);
347 return;
348 }
349 #endif
350 (*k_handler[type])(kbd, value);
351 } else
352 to_utf8(kbd->port, keysym);
353 }
354
355 /*
356 * Ioctl stuff.
357 */
358 static int
359 do_kdsk_ioctl(struct kbd_data *kbd, struct kbentry __user *user_kbe,
360 int cmd, int perm)
361 {
362 struct kbentry tmp;
363 unsigned long kb_index, kb_table;
364 ushort *key_map, val, ov;
365
366 if (copy_from_user(&tmp, user_kbe, sizeof(struct kbentry)))
367 return -EFAULT;
368 kb_index = (unsigned long) tmp.kb_index;
369 #if NR_KEYS < 256
370 if (kb_index >= NR_KEYS)
371 return -EINVAL;
372 #endif
373 kb_table = (unsigned long) tmp.kb_table;
374 #if MAX_NR_KEYMAPS < 256
375 if (kb_table >= MAX_NR_KEYMAPS)
376 return -EINVAL;
377 kb_table = array_index_nospec(kb_table , MAX_NR_KEYMAPS);
378 #endif
379
380 switch (cmd) {
381 case KDGKBENT:
382 key_map = kbd->key_maps[kb_table];
383 if (key_map) {
384 val = U(key_map[kb_index]);
385 if (KTYP(val) >= KBD_NR_TYPES)
386 val = K_HOLE;
387 } else
388 val = (kb_index ? K_HOLE : K_NOSUCHMAP);
389 return put_user(val, &user_kbe->kb_value);
390 case KDSKBENT:
391 if (!perm)
392 return -EPERM;
393 if (!kb_index && tmp.kb_value == K_NOSUCHMAP) {
394 /* disallocate map */
395 key_map = kbd->key_maps[kb_table];
396 if (key_map) {
397 kbd->key_maps[kb_table] = NULL;
398 kfree(key_map);
399 }
400 break;
401 }
402
403 if (KTYP(tmp.kb_value) >= KBD_NR_TYPES)
404 return -EINVAL;
405 if (KVAL(tmp.kb_value) > kbd_max_vals[KTYP(tmp.kb_value)])
406 return -EINVAL;
407
408 if (!(key_map = kbd->key_maps[kb_table])) {
409 int j;
410
411 key_map = kmalloc(sizeof(plain_map),
412 GFP_KERNEL);
413 if (!key_map)
414 return -ENOMEM;
415 kbd->key_maps[kb_table] = key_map;
416 for (j = 0; j < NR_KEYS; j++)
417 key_map[j] = U(K_HOLE);
418 }
419 ov = U(key_map[kb_index]);
420 if (tmp.kb_value == ov)
421 break; /* nothing to do */
422 /*
423 * Attention Key.
424 */
425 if (((ov == K_SAK) || (tmp.kb_value == K_SAK)) &&
426 !capable(CAP_SYS_ADMIN))
427 return -EPERM;
428 key_map[kb_index] = U(tmp.kb_value);
429 break;
430 }
431 return 0;
432 }
433
434 static int
435 do_kdgkb_ioctl(struct kbd_data *kbd, struct kbsentry __user *u_kbs,
436 int cmd, int perm)
437 {
438 unsigned char kb_func;
439 char *p;
440 int len;
441
442 /* Get u_kbs->kb_func. */
443 if (get_user(kb_func, &u_kbs->kb_func))
444 return -EFAULT;
445 #if MAX_NR_FUNC < 256
446 if (kb_func >= MAX_NR_FUNC)
447 return -EINVAL;
448 #endif
449
450 switch (cmd) {
451 case KDGKBSENT:
452 p = kbd->func_table[kb_func];
453 if (p) {
454 len = strlen(p);
455 if (len >= sizeof(u_kbs->kb_string))
456 len = sizeof(u_kbs->kb_string) - 1;
457 if (copy_to_user(u_kbs->kb_string, p, len))
458 return -EFAULT;
459 } else
460 len = 0;
461 if (put_user('\0', u_kbs->kb_string + len))
462 return -EFAULT;
463 break;
464 case KDSKBSENT:
465 if (!perm)
466 return -EPERM;
467 p = strndup_user(u_kbs->kb_string, sizeof(u_kbs->kb_string));
468 if (IS_ERR(p))
469 return PTR_ERR(p);
470 kfree(kbd->func_table[kb_func]);
471 kbd->func_table[kb_func] = p;
472 break;
473 }
474 return 0;
475 }
476
477 int kbd_ioctl(struct kbd_data *kbd, unsigned int cmd, unsigned long arg)
478 {
479 struct tty_struct *tty;
480 void __user *argp;
481 unsigned int ct;
482 int perm;
483
484 argp = (void __user *)arg;
485
486 /*
487 * To have permissions to do most of the vt ioctls, we either have
488 * to be the owner of the tty, or have CAP_SYS_TTY_CONFIG.
489 */
490 tty = tty_port_tty_get(kbd->port);
491 /* FIXME this test is pretty racy */
492 perm = current->signal->tty == tty || capable(CAP_SYS_TTY_CONFIG);
493 tty_kref_put(tty);
494 switch (cmd) {
495 case KDGKBTYPE:
496 return put_user(KB_101, (char __user *)argp);
497 case KDGKBENT:
498 case KDSKBENT:
499 return do_kdsk_ioctl(kbd, argp, cmd, perm);
500 case KDGKBSENT:
501 case KDSKBSENT:
502 return do_kdgkb_ioctl(kbd, argp, cmd, perm);
503 case KDGKBDIACR:
504 {
505 struct kbdiacrs __user *a = argp;
506 struct kbdiacr diacr;
507 int i;
508
509 if (put_user(kbd->accent_table_size, &a->kb_cnt))
510 return -EFAULT;
511 for (i = 0; i < kbd->accent_table_size; i++) {
512 diacr.diacr = kbd->accent_table[i].diacr;
513 diacr.base = kbd->accent_table[i].base;
514 diacr.result = kbd->accent_table[i].result;
515 if (copy_to_user(a->kbdiacr + i, &diacr, sizeof(struct kbdiacr)))
516 return -EFAULT;
517 }
518 return 0;
519 }
520 case KDGKBDIACRUC:
521 {
522 struct kbdiacrsuc __user *a = argp;
523
524 ct = kbd->accent_table_size;
525 if (put_user(ct, &a->kb_cnt))
526 return -EFAULT;
527 if (copy_to_user(a->kbdiacruc, kbd->accent_table,
528 ct * sizeof(struct kbdiacruc)))
529 return -EFAULT;
530 return 0;
531 }
532 case KDSKBDIACR:
533 {
534 struct kbdiacrs __user *a = argp;
535 struct kbdiacr diacr;
536 int i;
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 for (i = 0; i < ct; i++) {
546 if (copy_from_user(&diacr, a->kbdiacr + i, sizeof(struct kbdiacr)))
547 return -EFAULT;
548 kbd->accent_table[i].diacr = diacr.diacr;
549 kbd->accent_table[i].base = diacr.base;
550 kbd->accent_table[i].result = diacr.result;
551 }
552 return 0;
553 }
554 case KDSKBDIACRUC:
555 {
556 struct kbdiacrsuc __user *a = argp;
557
558 if (!perm)
559 return -EPERM;
560 if (get_user(ct, &a->kb_cnt))
561 return -EFAULT;
562 if (ct >= MAX_DIACR)
563 return -EINVAL;
564 kbd->accent_table_size = ct;
565 if (copy_from_user(kbd->accent_table, a->kbdiacruc,
566 ct * sizeof(struct kbdiacruc)))
567 return -EFAULT;
568 return 0;
569 }
570 default:
571 return -ENOIOCTLCMD;
572 }
573 }
574
575 EXPORT_SYMBOL(kbd_ioctl);
576 EXPORT_SYMBOL(kbd_ascebc);
577 EXPORT_SYMBOL(kbd_free);
578 EXPORT_SYMBOL(kbd_alloc);
579 EXPORT_SYMBOL(kbd_keycode);
Linux with added FPC-III support