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path: root/drivers/s390/char/keyboard.c
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Diffstat (limited to 'drivers/s390/char/keyboard.c')
-rw-r--r--drivers/s390/char/keyboard.c519
1 files changed, 519 insertions, 0 deletions
diff --git a/drivers/s390/char/keyboard.c b/drivers/s390/char/keyboard.c
new file mode 100644
index 000000000000..fd43d99b45a3
--- /dev/null
+++ b/drivers/s390/char/keyboard.c
@@ -0,0 +1,519 @@
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/config.h>
11#include <linux/module.h>
12#include <linux/sched.h>
13#include <linux/sysrq.h>
14
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
30typedef void (k_handler_fn)(struct kbd_data *, unsigned char);
31static k_handler_fn K_HANDLERS;
32static k_handler_fn *k_handler[16] = { K_HANDLERS };
33
34/* maximum values each key_handler can handle */
35static 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};
39static const int KBD_NR_TYPES = ARRAY_SIZE(kbd_max_vals);
40
41static unsigned char ret_diacr[NR_DEAD] = {
42 '`', '\'', '^', '~', '"', ','
43};
44
45/*
46 * Alloc/free of kbd_data structures.
47 */
48struct kbd_data *
49kbd_alloc(void) {
50 struct kbd_data *kbd;
51 int i, len;
52
53 kbd = kmalloc(sizeof(struct kbd_data), GFP_KERNEL);
54 if (!kbd)
55 goto out;
56 memset(kbd, 0, sizeof(struct kbd_data));
57 kbd->key_maps = kmalloc(sizeof(key_maps), GFP_KERNEL);
58 if (!key_maps)
59 goto out_kbd;
60 memset(kbd->key_maps, 0, sizeof(key_maps));
61 for (i = 0; i < ARRAY_SIZE(key_maps); i++) {
62 if (key_maps[i]) {
63 kbd->key_maps[i] =
64 kmalloc(sizeof(u_short)*NR_KEYS, GFP_KERNEL);
65 if (!kbd->key_maps[i])
66 goto out_maps;
67 memcpy(kbd->key_maps[i], key_maps[i],
68 sizeof(u_short)*NR_KEYS);
69 }
70 }
71 kbd->func_table = kmalloc(sizeof(func_table), GFP_KERNEL);
72 if (!kbd->func_table)
73 goto out_maps;
74 memset(kbd->func_table, 0, sizeof(func_table));
75 for (i = 0; i < ARRAY_SIZE(func_table); i++) {
76 if (func_table[i]) {
77 len = strlen(func_table[i]) + 1;
78 kbd->func_table[i] = kmalloc(len, GFP_KERNEL);
79 if (!kbd->func_table[i])
80 goto out_func;
81 memcpy(kbd->func_table[i], func_table[i], len);
82 }
83 }
84 kbd->fn_handler =
85 kmalloc(sizeof(fn_handler_fn *) * NR_FN_HANDLER, GFP_KERNEL);
86 if (!kbd->fn_handler)
87 goto out_func;
88 memset(kbd->fn_handler, 0, sizeof(fn_handler_fn *) * NR_FN_HANDLER);
89 kbd->accent_table =
90 kmalloc(sizeof(struct kbdiacr)*MAX_DIACR, GFP_KERNEL);
91 if (!kbd->accent_table)
92 goto out_fn_handler;
93 memcpy(kbd->accent_table, accent_table,
94 sizeof(struct kbdiacr)*MAX_DIACR);
95 kbd->accent_table_size = accent_table_size;
96 return kbd;
97
98out_fn_handler:
99 kfree(kbd->fn_handler);
100out_func:
101 for (i = 0; i < ARRAY_SIZE(func_table); i++)
102 if (kbd->func_table[i])
103 kfree(kbd->func_table[i]);
104 kfree(kbd->func_table);
105out_maps:
106 for (i = 0; i < ARRAY_SIZE(key_maps); i++)
107 if (kbd->key_maps[i])
108 kfree(kbd->key_maps[i]);
109 kfree(kbd->key_maps);
110out_kbd:
111 kfree(kbd);
112out:
113 return 0;
114}
115
116void
117kbd_free(struct kbd_data *kbd)
118{
119 int i;
120
121 kfree(kbd->accent_table);
122 kfree(kbd->fn_handler);
123 for (i = 0; i < ARRAY_SIZE(func_table); i++)
124 if (kbd->func_table[i])
125 kfree(kbd->func_table[i]);
126 kfree(kbd->func_table);
127 for (i = 0; i < ARRAY_SIZE(key_maps); i++)
128 if (kbd->key_maps[i])
129 kfree(kbd->key_maps[i]);
130 kfree(kbd->key_maps);
131 kfree(kbd);
132}
133
134/*
135 * Generate ascii -> ebcdic translation table from kbd_data.
136 */
137void
138kbd_ascebc(struct kbd_data *kbd, unsigned char *ascebc)
139{
140 unsigned short *keymap, keysym;
141 int i, j, k;
142
143 memset(ascebc, 0x40, 256);
144 for (i = 0; i < ARRAY_SIZE(key_maps); i++) {
145 keymap = kbd->key_maps[i];
146 if (!keymap)
147 continue;
148 for (j = 0; j < NR_KEYS; j++) {
149 k = ((i & 1) << 7) + j;
150 keysym = keymap[j];
151 if (KTYP(keysym) == (KT_LATIN | 0xf0) ||
152 KTYP(keysym) == (KT_LETTER | 0xf0))
153 ascebc[KVAL(keysym)] = k;
154 else if (KTYP(keysym) == (KT_DEAD | 0xf0))
155 ascebc[ret_diacr[KVAL(keysym)]] = k;
156 }
157 }
158}
159
160/*
161 * Generate ebcdic -> ascii translation table from kbd_data.
162 */
163void
164kbd_ebcasc(struct kbd_data *kbd, unsigned char *ebcasc)
165{
166 unsigned short *keymap, keysym;
167 int i, j, k;
168
169 memset(ebcasc, ' ', 256);
170 for (i = 0; i < ARRAY_SIZE(key_maps); i++) {
171 keymap = kbd->key_maps[i];
172 if (!keymap)
173 continue;
174 for (j = 0; j < NR_KEYS; j++) {
175 keysym = keymap[j];
176 k = ((i & 1) << 7) + j;
177 if (KTYP(keysym) == (KT_LATIN | 0xf0) ||
178 KTYP(keysym) == (KT_LETTER | 0xf0))
179 ebcasc[k] = KVAL(keysym);
180 else if (KTYP(keysym) == (KT_DEAD | 0xf0))
181 ebcasc[k] = ret_diacr[KVAL(keysym)];
182 }
183 }
184}
185
186/*
187 * We have a combining character DIACR here, followed by the character CH.
188 * If the combination occurs in the table, return the corresponding value.
189 * Otherwise, if CH is a space or equals DIACR, return DIACR.
190 * Otherwise, conclude that DIACR was not combining after all,
191 * queue it and return CH.
192 */
193static unsigned char
194handle_diacr(struct kbd_data *kbd, unsigned char ch)
195{
196 int i, d;
197
198 d = kbd->diacr;
199 kbd->diacr = 0;
200
201 for (i = 0; i < kbd->accent_table_size; i++) {
202 if (kbd->accent_table[i].diacr == d &&
203 kbd->accent_table[i].base == ch)
204 return kbd->accent_table[i].result;
205 }
206
207 if (ch == ' ' || ch == d)
208 return d;
209
210 kbd_put_queue(kbd->tty, d);
211 return ch;
212}
213
214/*
215 * Handle dead key.
216 */
217static void
218k_dead(struct kbd_data *kbd, unsigned char value)
219{
220 value = ret_diacr[value];
221 kbd->diacr = (kbd->diacr ? handle_diacr(kbd, value) : value);
222}
223
224/*
225 * Normal character handler.
226 */
227static void
228k_self(struct kbd_data *kbd, unsigned char value)
229{
230 if (kbd->diacr)
231 value = handle_diacr(kbd, value);
232 kbd_put_queue(kbd->tty, value);
233}
234
235/*
236 * Special key handlers
237 */
238static void
239k_ignore(struct kbd_data *kbd, unsigned char value)
240{
241}
242
243/*
244 * Function key handler.
245 */
246static void
247k_fn(struct kbd_data *kbd, unsigned char value)
248{
249 if (kbd->func_table[value])
250 kbd_puts_queue(kbd->tty, kbd->func_table[value]);
251}
252
253static void
254k_spec(struct kbd_data *kbd, unsigned char value)
255{
256 if (value >= NR_FN_HANDLER)
257 return;
258 if (kbd->fn_handler[value])
259 kbd->fn_handler[value](kbd);
260}
261
262/*
263 * Put utf8 character to tty flip buffer.
264 * UTF-8 is defined for words of up to 31 bits,
265 * but we need only 16 bits here
266 */
267static void
268to_utf8(struct tty_struct *tty, ushort c)
269{
270 if (c < 0x80)
271 /* 0******* */
272 kbd_put_queue(tty, c);
273 else if (c < 0x800) {
274 /* 110***** 10****** */
275 kbd_put_queue(tty, 0xc0 | (c >> 6));
276 kbd_put_queue(tty, 0x80 | (c & 0x3f));
277 } else {
278 /* 1110**** 10****** 10****** */
279 kbd_put_queue(tty, 0xe0 | (c >> 12));
280 kbd_put_queue(tty, 0x80 | ((c >> 6) & 0x3f));
281 kbd_put_queue(tty, 0x80 | (c & 0x3f));
282 }
283}
284
285/*
286 * Process keycode.
287 */
288void
289kbd_keycode(struct kbd_data *kbd, unsigned int keycode)
290{
291 unsigned short keysym;
292 unsigned char type, value;
293
294 if (!kbd || !kbd->tty)
295 return;
296
297 if (keycode >= 384)
298 keysym = kbd->key_maps[5][keycode - 384];
299 else if (keycode >= 256)
300 keysym = kbd->key_maps[4][keycode - 256];
301 else if (keycode >= 128)
302 keysym = kbd->key_maps[1][keycode - 128];
303 else
304 keysym = kbd->key_maps[0][keycode];
305
306 type = KTYP(keysym);
307 if (type >= 0xf0) {
308 type -= 0xf0;
309 if (type == KT_LETTER)
310 type = KT_LATIN;
311 value = KVAL(keysym);
312#ifdef CONFIG_MAGIC_SYSRQ /* Handle the SysRq Hack */
313 if (kbd->sysrq) {
314 if (kbd->sysrq == K(KT_LATIN, '-')) {
315 kbd->sysrq = 0;
316 handle_sysrq(value, 0, kbd->tty);
317 return;
318 }
319 if (value == '-') {
320 kbd->sysrq = K(KT_LATIN, '-');
321 return;
322 }
323 /* Incomplete sysrq sequence. */
324 (*k_handler[KTYP(kbd->sysrq)])(kbd, KVAL(kbd->sysrq));
325 kbd->sysrq = 0;
326 } else if ((type == KT_LATIN && value == '^') ||
327 (type == KT_DEAD && ret_diacr[value] == '^')) {
328 kbd->sysrq = K(type, value);
329 return;
330 }
331#endif
332 (*k_handler[type])(kbd, value);
333 } else
334 to_utf8(kbd->tty, keysym);
335}
336
337/*
338 * Ioctl stuff.
339 */
340static int
341do_kdsk_ioctl(struct kbd_data *kbd, struct kbentry __user *user_kbe,
342 int cmd, int perm)
343{
344 struct kbentry tmp;
345 ushort *key_map, val, ov;
346
347 if (copy_from_user(&tmp, user_kbe, sizeof(struct kbentry)))
348 return -EFAULT;
349#if NR_KEYS < 256
350 if (tmp.kb_index >= NR_KEYS)
351 return -EINVAL;
352#endif
353#if MAX_NR_KEYMAPS < 256
354 if (tmp.kb_table >= MAX_NR_KEYMAPS)
355 return -EINVAL;
356#endif
357
358 switch (cmd) {
359 case KDGKBENT:
360 key_map = kbd->key_maps[tmp.kb_table];
361 if (key_map) {
362 val = U(key_map[tmp.kb_index]);
363 if (KTYP(val) >= KBD_NR_TYPES)
364 val = K_HOLE;
365 } else
366 val = (tmp.kb_index ? K_HOLE : K_NOSUCHMAP);
367 return put_user(val, &user_kbe->kb_value);
368 case KDSKBENT:
369 if (!perm)
370 return -EPERM;
371 if (!tmp.kb_index && tmp.kb_value == K_NOSUCHMAP) {
372 /* disallocate map */
373 key_map = kbd->key_maps[tmp.kb_table];
374 if (key_map) {
375 kbd->key_maps[tmp.kb_table] = 0;
376 kfree(key_map);
377 }
378 break;
379 }
380
381 if (KTYP(tmp.kb_value) >= KBD_NR_TYPES)
382 return -EINVAL;
383 if (KVAL(tmp.kb_value) > kbd_max_vals[KTYP(tmp.kb_value)])
384 return -EINVAL;
385
386 if (!(key_map = kbd->key_maps[tmp.kb_table])) {
387 int j;
388
389 key_map = (ushort *) kmalloc(sizeof(plain_map),
390 GFP_KERNEL);
391 if (!key_map)
392 return -ENOMEM;
393 kbd->key_maps[tmp.kb_table] = key_map;
394 for (j = 0; j < NR_KEYS; j++)
395 key_map[j] = U(K_HOLE);
396 }
397 ov = U(key_map[tmp.kb_index]);
398 if (tmp.kb_value == ov)
399 break; /* nothing to do */
400 /*
401 * Attention Key.
402 */
403 if (((ov == K_SAK) || (tmp.kb_value == K_SAK)) &&
404 !capable(CAP_SYS_ADMIN))
405 return -EPERM;
406 key_map[tmp.kb_index] = U(tmp.kb_value);
407 break;
408 }
409 return 0;
410}
411
412static int
413do_kdgkb_ioctl(struct kbd_data *kbd, struct kbsentry __user *u_kbs,
414 int cmd, int perm)
415{
416 unsigned char kb_func;
417 char *p;
418 int len;
419
420 /* Get u_kbs->kb_func. */
421 if (get_user(kb_func, &u_kbs->kb_func))
422 return -EFAULT;
423#if MAX_NR_FUNC < 256
424 if (kb_func >= MAX_NR_FUNC)
425 return -EINVAL;
426#endif
427
428 switch (cmd) {
429 case KDGKBSENT:
430 p = kbd->func_table[kb_func];
431 if (p) {
432 len = strlen(p);
433 if (len >= sizeof(u_kbs->kb_string))
434 len = sizeof(u_kbs->kb_string) - 1;
435 if (copy_to_user(u_kbs->kb_string, p, len))
436 return -EFAULT;
437 } else
438 len = 0;
439 if (put_user('\0', u_kbs->kb_string + len))
440 return -EFAULT;
441 break;
442 case KDSKBSENT:
443 if (!perm)
444 return -EPERM;
445 len = strnlen_user(u_kbs->kb_string,
446 sizeof(u_kbs->kb_string) - 1);
447 p = kmalloc(len, GFP_KERNEL);
448 if (!p)
449 return -ENOMEM;
450 if (copy_from_user(p, u_kbs->kb_string, len)) {
451 kfree(p);
452 return -EFAULT;
453 }
454 p[len] = 0;
455 if (kbd->func_table[kb_func])
456 kfree(kbd->func_table[kb_func]);
457 kbd->func_table[kb_func] = p;
458 break;
459 }
460 return 0;
461}
462
463int
464kbd_ioctl(struct kbd_data *kbd, struct file *file,
465 unsigned int cmd, unsigned long arg)
466{
467 struct kbdiacrs __user *a;
468 void __user *argp;
469 int ct, perm;
470
471 argp = (void __user *)arg;
472
473 /*
474 * To have permissions to do most of the vt ioctls, we either have
475 * to be the owner of the tty, or have CAP_SYS_TTY_CONFIG.
476 */
477 perm = current->signal->tty == kbd->tty || capable(CAP_SYS_TTY_CONFIG);
478 switch (cmd) {
479 case KDGKBTYPE:
480 return put_user(KB_101, (char __user *)argp);
481 case KDGKBENT:
482 case KDSKBENT:
483 return do_kdsk_ioctl(kbd, argp, cmd, perm);
484 case KDGKBSENT:
485 case KDSKBSENT:
486 return do_kdgkb_ioctl(kbd, argp, cmd, perm);
487 case KDGKBDIACR:
488 a = argp;
489
490 if (put_user(kbd->accent_table_size, &a->kb_cnt))
491 return -EFAULT;
492 ct = kbd->accent_table_size;
493 if (copy_to_user(a->kbdiacr, kbd->accent_table,
494 ct * sizeof(struct kbdiacr)))
495 return -EFAULT;
496 return 0;
497 case KDSKBDIACR:
498 a = argp;
499 if (!perm)
500 return -EPERM;
501 if (get_user(ct, &a->kb_cnt))
502 return -EFAULT;
503 if (ct >= MAX_DIACR)
504 return -EINVAL;
505 kbd->accent_table_size = ct;
506 if (copy_from_user(kbd->accent_table, a->kbdiacr,
507 ct * sizeof(struct kbdiacr)))
508 return -EFAULT;
509 return 0;
510 default:
511 return -ENOIOCTLCMD;
512 }
513}
514
515EXPORT_SYMBOL(kbd_ioctl);
516EXPORT_SYMBOL(kbd_ascebc);
517EXPORT_SYMBOL(kbd_free);
518EXPORT_SYMBOL(kbd_alloc);
519EXPORT_SYMBOL(kbd_keycode);
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-08 10:11:05 -0500