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include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit...
[net-next-2.6.git] / drivers / s390 / char / keyboard.c
CommitLineData
1da177e4
LT		 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
1da177e4
LT		 10#include <linux/module.h>
11#include <linux/sched.h>
5a0e3ad6 12#include <linux/slab.h>
1da177e4
LT		 13#include <linux/sysrq.h>
14
04c71976 15#include <linux/consolemap.h>
1da177e4
LT		 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
31typedef void (k_handler_fn)(struct kbd_data *, unsigned char);
32static k_handler_fn K_HANDLERS;
33static k_handler_fn *k_handler[16] = { K_HANDLERS };
34
35/* maximum values each key_handler can handle */
36static 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};
40static const int KBD_NR_TYPES = ARRAY_SIZE(kbd_max_vals);
41
42static unsigned char ret_diacr[NR_DEAD] = {
43 '`', '\'', '^', '~', '"', ','
44};
45
46/*
47 * Alloc/free of kbd_data structures.
48 */
49struct kbd_data *
50kbd_alloc(void) {
51 struct kbd_data *kbd;
52 int i, len;
53
88abaab4 54 kbd = kzalloc(sizeof(struct kbd_data), GFP_KERNEL);
1da177e4
LT		 55 if (!kbd)
56 goto out;
88abaab4 57 kbd->key_maps = kzalloc(sizeof(key_maps), GFP_KERNEL);
da074d0a 58 if (!kbd->key_maps)
1da177e4 59 goto out_kbd;
1da177e4
LT		 60 for (i = 0; i < ARRAY_SIZE(key_maps); i++) {
61 if (key_maps[i]) {
62 kbd->key_maps[i] =
63 kmalloc(sizeof(u_short)*NR_KEYS, GFP_KERNEL);
64 if (!kbd->key_maps[i])
65 goto out_maps;
66 memcpy(kbd->key_maps[i], key_maps[i],
67 sizeof(u_short)*NR_KEYS);
68 }
69 }
88abaab4 70 kbd->func_table = kzalloc(sizeof(func_table), GFP_KERNEL);
1da177e4
LT		 71 if (!kbd->func_table)
72 goto out_maps;
1da177e4
LT		 73 for (i = 0; i < ARRAY_SIZE(func_table); i++) {
74 if (func_table[i]) {
75 len = strlen(func_table[i]) + 1;
76 kbd->func_table[i] = kmalloc(len, GFP_KERNEL);
77 if (!kbd->func_table[i])
78 goto out_func;
79 memcpy(kbd->func_table[i], func_table[i], len);
80 }
81 }
82 kbd->fn_handler =
88abaab4 83 kzalloc(sizeof(fn_handler_fn *) * NR_FN_HANDLER, GFP_KERNEL);
1da177e4
LT		 84 if (!kbd->fn_handler)
85 goto out_func;
1da177e4 86 kbd->accent_table =
04c71976 87 kmalloc(sizeof(struct kbdiacruc)*MAX_DIACR, GFP_KERNEL);
1da177e4
LT		 88 if (!kbd->accent_table)
89 goto out_fn_handler;
90 memcpy(kbd->accent_table, accent_table,
04c71976 91 sizeof(struct kbdiacruc)*MAX_DIACR);
1da177e4
LT		 92 kbd->accent_table_size = accent_table_size;
93 return kbd;
94
95out_fn_handler:
96 kfree(kbd->fn_handler);
97out_func:
98 for (i = 0; i < ARRAY_SIZE(func_table); i++)
17fd682e 99 kfree(kbd->func_table[i]);
1da177e4
LT		 100 kfree(kbd->func_table);
101out_maps:
102 for (i = 0; i < ARRAY_SIZE(key_maps); i++)
17fd682e 103 kfree(kbd->key_maps[i]);
1da177e4
LT		 104 kfree(kbd->key_maps);
105out_kbd:
106 kfree(kbd);
107out:
d2c993d8 108 return NULL;
1da177e4
LT		 109}
110
111void
112kbd_free(struct kbd_data *kbd)
113{
114 int i;
115
116 kfree(kbd->accent_table);
117 kfree(kbd->fn_handler);
118 for (i = 0; i < ARRAY_SIZE(func_table); i++)
17fd682e 119 kfree(kbd->func_table[i]);
1da177e4
LT		 120 kfree(kbd->func_table);
121 for (i = 0; i < ARRAY_SIZE(key_maps); i++)
17fd682e 122 kfree(kbd->key_maps[i]);
1da177e4
LT		 123 kfree(kbd->key_maps);
124 kfree(kbd);
125}
126
127/*
128 * Generate ascii -> ebcdic translation table from kbd_data.
129 */
130void
131kbd_ascebc(struct kbd_data *kbd, unsigned char *ascebc)
132{
133 unsigned short *keymap, keysym;
134 int i, j, k;
135
136 memset(ascebc, 0x40, 256);
137 for (i = 0; i < ARRAY_SIZE(key_maps); i++) {
138 keymap = kbd->key_maps[i];
139 if (!keymap)
140 continue;
141 for (j = 0; j < NR_KEYS; j++) {
142 k = ((i & 1) << 7) + j;
143 keysym = keymap[j];
144 if (KTYP(keysym) == (KT_LATIN | 0xf0) ||
145 KTYP(keysym) == (KT_LETTER | 0xf0))
146 ascebc[KVAL(keysym)] = k;
147 else if (KTYP(keysym) == (KT_DEAD | 0xf0))
148 ascebc[ret_diacr[KVAL(keysym)]] = k;
149 }
150 }
151}
152
2b67fc46 153#if 0
1da177e4
LT		 154/*
155 * Generate ebcdic -> ascii translation table from kbd_data.
156 */
157void
158kbd_ebcasc(struct kbd_data *kbd, unsigned char *ebcasc)
159{
160 unsigned short *keymap, keysym;
161 int i, j, k;
162
163 memset(ebcasc, ' ', 256);
164 for (i = 0; i < ARRAY_SIZE(key_maps); i++) {
165 keymap = kbd->key_maps[i];
166 if (!keymap)
167 continue;
168 for (j = 0; j < NR_KEYS; j++) {
169 keysym = keymap[j];
170 k = ((i & 1) << 7) + j;
171 if (KTYP(keysym) == (KT_LATIN | 0xf0) ||
172 KTYP(keysym) == (KT_LETTER | 0xf0))
173 ebcasc[k] = KVAL(keysym);
174 else if (KTYP(keysym) == (KT_DEAD | 0xf0))
175 ebcasc[k] = ret_diacr[KVAL(keysym)];
176 }
177 }
178}
2b67fc46 179#endif
1da177e4
LT		 180
181/*
182 * We have a combining character DIACR here, followed by the character CH.
183 * If the combination occurs in the table, return the corresponding value.
184 * Otherwise, if CH is a space or equals DIACR, return DIACR.
185 * Otherwise, conclude that DIACR was not combining after all,
186 * queue it and return CH.
187 */
04c71976
ST		 188static unsigned int
189handle_diacr(struct kbd_data *kbd, unsigned int ch)
1da177e4
LT		 190{
191 int i, d;
192
193 d = kbd->diacr;
194 kbd->diacr = 0;
195
196 for (i = 0; i < kbd->accent_table_size; i++) {
197 if (kbd->accent_table[i].diacr == d &&
198 kbd->accent_table[i].base == ch)
199 return kbd->accent_table[i].result;
200 }
201
202 if (ch == ' ' || ch == d)
203 return d;
204
205 kbd_put_queue(kbd->tty, d);
206 return ch;
207}
208
209/*
210 * Handle dead key.
211 */
212static void
213k_dead(struct kbd_data *kbd, unsigned char value)
214{
215 value = ret_diacr[value];
216 kbd->diacr = (kbd->diacr ? handle_diacr(kbd, value) : value);
217}
218
219/*
220 * Normal character handler.
221 */
222static void
223k_self(struct kbd_data *kbd, unsigned char value)
224{
225 if (kbd->diacr)
226 value = handle_diacr(kbd, value);
227 kbd_put_queue(kbd->tty, value);
228}
229
230/*
231 * Special key handlers
232 */
233static void
234k_ignore(struct kbd_data *kbd, unsigned char value)
235{
236}
237
238/*
239 * Function key handler.
240 */
241static void
242k_fn(struct kbd_data *kbd, unsigned char value)
243{
244 if (kbd->func_table[value])
245 kbd_puts_queue(kbd->tty, kbd->func_table[value]);
246}
247
248static void
249k_spec(struct kbd_data *kbd, unsigned char value)
250{
251 if (value >= NR_FN_HANDLER)
252 return;
253 if (kbd->fn_handler[value])
254 kbd->fn_handler[value](kbd);
255}
256
257/*
258 * Put utf8 character to tty flip buffer.
259 * UTF-8 is defined for words of up to 31 bits,
260 * but we need only 16 bits here
261 */
262static void
263to_utf8(struct tty_struct *tty, ushort c)
264{
265 if (c < 0x80)
266 /* 0******* */
267 kbd_put_queue(tty, c);
268 else if (c < 0x800) {
269 /* 110***** 10****** */
270 kbd_put_queue(tty, 0xc0 | (c >> 6));
271 kbd_put_queue(tty, 0x80 | (c & 0x3f));
272 } else {
273 /* 1110**** 10****** 10****** */
274 kbd_put_queue(tty, 0xe0 | (c >> 12));
275 kbd_put_queue(tty, 0x80 | ((c >> 6) & 0x3f));
276 kbd_put_queue(tty, 0x80 | (c & 0x3f));
277 }
278}
279
280/*
281 * Process keycode.
282 */
283void
284kbd_keycode(struct kbd_data *kbd, unsigned int keycode)
285{
286 unsigned short keysym;
287 unsigned char type, value;
288
289 if (!kbd || !kbd->tty)
290 return;
291
292 if (keycode >= 384)
293 keysym = kbd->key_maps[5][keycode - 384];
294 else if (keycode >= 256)
295 keysym = kbd->key_maps[4][keycode - 256];
296 else if (keycode >= 128)
297 keysym = kbd->key_maps[1][keycode - 128];
298 else
299 keysym = kbd->key_maps[0][keycode];
300
301 type = KTYP(keysym);
302 if (type >= 0xf0) {
303 type -= 0xf0;
304 if (type == KT_LETTER)
305 type = KT_LATIN;
306 value = KVAL(keysym);
307#ifdef CONFIG_MAGIC_SYSRQ /* Handle the SysRq Hack */
308 if (kbd->sysrq) {
309 if (kbd->sysrq == K(KT_LATIN, '-')) {
310 kbd->sysrq = 0;
5a489b98 311 handle_sysrq(value, kbd->tty);
1da177e4
LT		 312 return;
313 }
314 if (value == '-') {
315 kbd->sysrq = K(KT_LATIN, '-');
316 return;
317 }
318 /* Incomplete sysrq sequence. */
319 (*k_handler[KTYP(kbd->sysrq)])(kbd, KVAL(kbd->sysrq));
320 kbd->sysrq = 0;
321 } else if ((type == KT_LATIN && value == '^') ||
322 (type == KT_DEAD && ret_diacr[value] == '^')) {
323 kbd->sysrq = K(type, value);
324 return;
325 }
326#endif
327 (*k_handler[type])(kbd, value);
328 } else
329 to_utf8(kbd->tty, keysym);
330}
331
332/*
333 * Ioctl stuff.
334 */
335static int
336do_kdsk_ioctl(struct kbd_data *kbd, struct kbentry __user *user_kbe,
337 int cmd, int perm)
338{
339 struct kbentry tmp;
340 ushort *key_map, val, ov;
341
342 if (copy_from_user(&tmp, user_kbe, sizeof(struct kbentry)))
343 return -EFAULT;
344#if NR_KEYS < 256
345 if (tmp.kb_index >= NR_KEYS)
346 return -EINVAL;
347#endif
348#if MAX_NR_KEYMAPS < 256
349 if (tmp.kb_table >= MAX_NR_KEYMAPS)
350 return -EINVAL;
351#endif
352
353 switch (cmd) {
354 case KDGKBENT:
355 key_map = kbd->key_maps[tmp.kb_table];
356 if (key_map) {
357 val = U(key_map[tmp.kb_index]);
358 if (KTYP(val) >= KBD_NR_TYPES)
359 val = K_HOLE;
360 } else
361 val = (tmp.kb_index ? K_HOLE : K_NOSUCHMAP);
362 return put_user(val, &user_kbe->kb_value);
363 case KDSKBENT:
364 if (!perm)
365 return -EPERM;
366 if (!tmp.kb_index && tmp.kb_value == K_NOSUCHMAP) {
367 /* disallocate map */
368 key_map = kbd->key_maps[tmp.kb_table];
369 if (key_map) {
d2c993d8 370 kbd->key_maps[tmp.kb_table] = NULL;
1da177e4
LT		 371 kfree(key_map);
372 }
373 break;
374 }
375
376 if (KTYP(tmp.kb_value) >= KBD_NR_TYPES)
377 return -EINVAL;
378 if (KVAL(tmp.kb_value) > kbd_max_vals[KTYP(tmp.kb_value)])
379 return -EINVAL;
380
381 if (!(key_map = kbd->key_maps[tmp.kb_table])) {
382 int j;
383
5cbded58 384 key_map = kmalloc(sizeof(plain_map),
1da177e4
LT		 385 GFP_KERNEL);
386 if (!key_map)
387 return -ENOMEM;
388 kbd->key_maps[tmp.kb_table] = key_map;
389 for (j = 0; j < NR_KEYS; j++)
390 key_map[j] = U(K_HOLE);
391 }
392 ov = U(key_map[tmp.kb_index]);
393 if (tmp.kb_value == ov)
394 break; /* nothing to do */
395 /*
396 * Attention Key.
397 */
398 if (((ov == K_SAK) || (tmp.kb_value == K_SAK)) &&
399 !capable(CAP_SYS_ADMIN))
400 return -EPERM;
401 key_map[tmp.kb_index] = U(tmp.kb_value);
402 break;
403 }
404 return 0;
405}
406
407static int
408do_kdgkb_ioctl(struct kbd_data *kbd, struct kbsentry __user *u_kbs,
409 int cmd, int perm)
410{
411 unsigned char kb_func;
412 char *p;
413 int len;
414
415 /* Get u_kbs->kb_func. */
416 if (get_user(kb_func, &u_kbs->kb_func))
417 return -EFAULT;
418#if MAX_NR_FUNC < 256
419 if (kb_func >= MAX_NR_FUNC)
420 return -EINVAL;
421#endif
422
423 switch (cmd) {
424 case KDGKBSENT:
425 p = kbd->func_table[kb_func];
426 if (p) {
427 len = strlen(p);
428 if (len >= sizeof(u_kbs->kb_string))
429 len = sizeof(u_kbs->kb_string) - 1;
430 if (copy_to_user(u_kbs->kb_string, p, len))
431 return -EFAULT;
432 } else
433 len = 0;
434 if (put_user('\0', u_kbs->kb_string + len))
435 return -EFAULT;
436 break;
437 case KDSKBSENT:
438 if (!perm)
439 return -EPERM;
440 len = strnlen_user(u_kbs->kb_string,
441 sizeof(u_kbs->kb_string) - 1);
172411f1
DA		 442 if (!len)
443 return -EFAULT;
444 if (len > sizeof(u_kbs->kb_string) - 1)
445 return -EINVAL;
446 p = kmalloc(len + 1, GFP_KERNEL);
1da177e4
LT		 447 if (!p)
448 return -ENOMEM;
449 if (copy_from_user(p, u_kbs->kb_string, len)) {
450 kfree(p);
451 return -EFAULT;
452 }
453 p[len] = 0;
17fd682e 454 kfree(kbd->func_table[kb_func]);
1da177e4
LT		 455 kbd->func_table[kb_func] = p;
456 break;
457 }
458 return 0;
459}
460
461int
462kbd_ioctl(struct kbd_data *kbd, struct file *file,
463 unsigned int cmd, unsigned long arg)
464{
1da177e4
LT		 465 void __user *argp;
466 int ct, perm;
467
468 argp = (void __user *)arg;
469
470 /*
471 * To have permissions to do most of the vt ioctls, we either have
472 * to be the owner of the tty, or have CAP_SYS_TTY_CONFIG.
473 */
474 perm = current->signal->tty == kbd->tty || capable(CAP_SYS_TTY_CONFIG);
475 switch (cmd) {
476 case KDGKBTYPE:
477 return put_user(KB_101, (char __user *)argp);
478 case KDGKBENT:
479 case KDSKBENT:
480 return do_kdsk_ioctl(kbd, argp, cmd, perm);
481 case KDGKBSENT:
482 case KDSKBSENT:
483 return do_kdgkb_ioctl(kbd, argp, cmd, perm);
484 case KDGKBDIACR:
04c71976
ST		 485 {
486 struct kbdiacrs __user *a = argp;
487 struct kbdiacr diacr;
488 int i;
1da177e4
LT		 489
490 if (put_user(kbd->accent_table_size, &a->kb_cnt))
491 return -EFAULT;
04c71976
ST		 492 for (i = 0; i < kbd->accent_table_size; i++) {
493 diacr.diacr = kbd->accent_table[i].diacr;
494 diacr.base = kbd->accent_table[i].base;
495 diacr.result = kbd->accent_table[i].result;
496 if (copy_to_user(a->kbdiacr + i, &diacr, sizeof(struct kbdiacr)))
497 return -EFAULT;
498 }
499 return 0;
500 }
501 case KDGKBDIACRUC:
502 {
503 struct kbdiacrsuc __user *a = argp;
504
1da177e4 505 ct = kbd->accent_table_size;
04c71976
ST		 506 if (put_user(ct, &a->kb_cnt))
507 return -EFAULT;
508 if (copy_to_user(a->kbdiacruc, kbd->accent_table,
509 ct * sizeof(struct kbdiacruc)))
1da177e4
LT		 510 return -EFAULT;
511 return 0;
04c71976 512 }
1da177e4 513 case KDSKBDIACR:
04c71976
ST		 514 {
515 struct kbdiacrs __user *a = argp;
516 struct kbdiacr diacr;
517 int i;
518
1da177e4
LT		 519 if (!perm)
520 return -EPERM;
521 if (get_user(ct, &a->kb_cnt))
522 return -EFAULT;
523 if (ct >= MAX_DIACR)
524 return -EINVAL;
525 kbd->accent_table_size = ct;
04c71976
ST		 526 for (i = 0; i < ct; i++) {
527 if (copy_from_user(&diacr, a->kbdiacr + i, sizeof(struct kbdiacr)))
528 return -EFAULT;
529 kbd->accent_table[i].diacr = diacr.diacr;
530 kbd->accent_table[i].base = diacr.base;
531 kbd->accent_table[i].result = diacr.result;
532 }
533 return 0;
534 }
535 case KDSKBDIACRUC:
536 {
537 struct kbdiacrsuc __user *a = argp;
538
539 if (!perm)
540 return -EPERM;
541 if (get_user(ct, &a->kb_cnt))
542 return -EFAULT;
543 if (ct >= MAX_DIACR)
544 return -EINVAL;
545 kbd->accent_table_size = ct;
546 if (copy_from_user(kbd->accent_table, a->kbdiacruc,
547 ct * sizeof(struct kbdiacruc)))
1da177e4
LT		 548 return -EFAULT;
549 return 0;
04c71976 550 }
1da177e4
LT		 551 default:
552 return -ENOIOCTLCMD;
553 }
554}
555
556EXPORT_SYMBOL(kbd_ioctl);
557EXPORT_SYMBOL(kbd_ascebc);
558EXPORT_SYMBOL(kbd_free);
559EXPORT_SYMBOL(kbd_alloc);
560EXPORT_SYMBOL(kbd_keycode);
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