2 * drivers/s390/char/keyboard.c
3 * ebcdic keycode functions for s390 console drivers
6 * Copyright (C) 2003 IBM Deutschland Entwicklung GmbH, IBM Corporation
7 * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com),
10 #include <linux/module.h>
11 #include <linux/sched.h>
12 #include <linux/sysrq.h>
14 #include <linux/kbd_kern.h>
15 #include <linux/kbd_diacr.h>
16 #include <asm/uaccess.h>
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
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 };
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
38 static const int KBD_NR_TYPES = ARRAY_SIZE(kbd_max_vals);
40 static unsigned char ret_diacr[NR_DEAD] = {
41 '`', '\'', '^', '~', '"', ','
45 * Alloc/free of kbd_data structures.
52 kbd = kzalloc(sizeof(struct kbd_data), GFP_KERNEL);
55 kbd->key_maps = kzalloc(sizeof(key_maps), GFP_KERNEL);
58 for (i = 0; i < ARRAY_SIZE(key_maps); i++) {
61 kmalloc(sizeof(u_short)*NR_KEYS, GFP_KERNEL);
62 if (!kbd->key_maps[i])
64 memcpy(kbd->key_maps[i], key_maps[i],
65 sizeof(u_short)*NR_KEYS);
68 kbd->func_table = kzalloc(sizeof(func_table), GFP_KERNEL);
71 for (i = 0; i < ARRAY_SIZE(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])
77 memcpy(kbd->func_table[i], func_table[i], len);
81 kzalloc(sizeof(fn_handler_fn *) * NR_FN_HANDLER, GFP_KERNEL);
85 kmalloc(sizeof(struct kbdiacr)*MAX_DIACR, GFP_KERNEL);
86 if (!kbd->accent_table)
88 memcpy(kbd->accent_table, accent_table,
89 sizeof(struct kbdiacr)*MAX_DIACR);
90 kbd->accent_table_size = accent_table_size;
94 kfree(kbd->fn_handler);
96 for (i = 0; i < ARRAY_SIZE(func_table); i++)
97 kfree(kbd->func_table[i]);
98 kfree(kbd->func_table);
100 for (i = 0; i < ARRAY_SIZE(key_maps); i++)
101 kfree(kbd->key_maps[i]);
102 kfree(kbd->key_maps);
110 kbd_free(struct kbd_data *kbd)
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);
126 * Generate ascii -> ebcdic translation table from kbd_data.
129 kbd_ascebc(struct kbd_data *kbd, unsigned char *ascebc)
131 unsigned short *keymap, keysym;
134 memset(ascebc, 0x40, 256);
135 for (i = 0; i < ARRAY_SIZE(key_maps); i++) {
136 keymap = kbd->key_maps[i];
139 for (j = 0; j < NR_KEYS; j++) {
140 k = ((i & 1) << 7) + 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;
153 * Generate ebcdic -> ascii translation table from kbd_data.
156 kbd_ebcasc(struct kbd_data *kbd, unsigned char *ebcasc)
158 unsigned short *keymap, keysym;
161 memset(ebcasc, ' ', 256);
162 for (i = 0; i < ARRAY_SIZE(key_maps); i++) {
163 keymap = kbd->key_maps[i];
166 for (j = 0; j < NR_KEYS; 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)];
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.
187 handle_diacr(struct kbd_data *kbd, unsigned char ch)
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;
200 if (ch == ' ' || ch == d)
203 kbd_put_queue(kbd->tty, d);
211 k_dead(struct kbd_data *kbd, unsigned char value)
213 value = ret_diacr[value];
214 kbd->diacr = (kbd->diacr ? handle_diacr(kbd, value) : value);
218 * Normal character handler.
221 k_self(struct kbd_data *kbd, unsigned char value)
224 value = handle_diacr(kbd, value);
225 kbd_put_queue(kbd->tty, value);
229 * Special key handlers
232 k_ignore(struct kbd_data *kbd, unsigned char value)
237 * Function key handler.
240 k_fn(struct kbd_data *kbd, unsigned char value)
242 if (kbd->func_table[value])
243 kbd_puts_queue(kbd->tty, kbd->func_table[value]);
247 k_spec(struct kbd_data *kbd, unsigned char value)
249 if (value >= NR_FN_HANDLER)
251 if (kbd->fn_handler[value])
252 kbd->fn_handler[value](kbd);
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
261 to_utf8(struct tty_struct *tty, ushort c)
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));
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));
282 kbd_keycode(struct kbd_data *kbd, unsigned int keycode)
284 unsigned short keysym;
285 unsigned char type, value;
287 if (!kbd || !kbd->tty)
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];
297 keysym = kbd->key_maps[0][keycode];
302 if (type == KT_LETTER)
304 value = KVAL(keysym);
305 #ifdef CONFIG_MAGIC_SYSRQ /* Handle the SysRq Hack */
307 if (kbd->sysrq == K(KT_LATIN, '-')) {
309 handle_sysrq(value, kbd->tty);
313 kbd->sysrq = K(KT_LATIN, '-');
316 /* Incomplete sysrq sequence. */
317 (*k_handler[KTYP(kbd->sysrq)])(kbd, KVAL(kbd->sysrq));
319 } else if ((type == KT_LATIN && value == '^') ||
320 (type == KT_DEAD && ret_diacr[value] == '^')) {
321 kbd->sysrq = K(type, value);
325 (*k_handler[type])(kbd, value);
327 to_utf8(kbd->tty, keysym);
334 do_kdsk_ioctl(struct kbd_data *kbd, struct kbentry __user *user_kbe,
338 ushort *key_map, val, ov;
340 if (copy_from_user(&tmp, user_kbe, sizeof(struct kbentry)))
343 if (tmp.kb_index >= NR_KEYS)
346 #if MAX_NR_KEYMAPS < 256
347 if (tmp.kb_table >= MAX_NR_KEYMAPS)
353 key_map = kbd->key_maps[tmp.kb_table];
355 val = U(key_map[tmp.kb_index]);
356 if (KTYP(val) >= KBD_NR_TYPES)
359 val = (tmp.kb_index ? K_HOLE : K_NOSUCHMAP);
360 return put_user(val, &user_kbe->kb_value);
364 if (!tmp.kb_index && tmp.kb_value == K_NOSUCHMAP) {
365 /* disallocate map */
366 key_map = kbd->key_maps[tmp.kb_table];
368 kbd->key_maps[tmp.kb_table] = NULL;
374 if (KTYP(tmp.kb_value) >= KBD_NR_TYPES)
376 if (KVAL(tmp.kb_value) > kbd_max_vals[KTYP(tmp.kb_value)])
379 if (!(key_map = kbd->key_maps[tmp.kb_table])) {
382 key_map = kmalloc(sizeof(plain_map),
386 kbd->key_maps[tmp.kb_table] = key_map;
387 for (j = 0; j < NR_KEYS; j++)
388 key_map[j] = U(K_HOLE);
390 ov = U(key_map[tmp.kb_index]);
391 if (tmp.kb_value == ov)
392 break; /* nothing to do */
396 if (((ov == K_SAK) || (tmp.kb_value == K_SAK)) &&
397 !capable(CAP_SYS_ADMIN))
399 key_map[tmp.kb_index] = U(tmp.kb_value);
406 do_kdgkb_ioctl(struct kbd_data *kbd, struct kbsentry __user *u_kbs,
409 unsigned char kb_func;
413 /* Get u_kbs->kb_func. */
414 if (get_user(kb_func, &u_kbs->kb_func))
416 #if MAX_NR_FUNC < 256
417 if (kb_func >= MAX_NR_FUNC)
423 p = kbd->func_table[kb_func];
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))
432 if (put_user('\0', u_kbs->kb_string + len))
438 len = strnlen_user(u_kbs->kb_string,
439 sizeof(u_kbs->kb_string) - 1);
442 if (len > sizeof(u_kbs->kb_string) - 1)
444 p = kmalloc(len + 1, GFP_KERNEL);
447 if (copy_from_user(p, u_kbs->kb_string, len)) {
452 kfree(kbd->func_table[kb_func]);
453 kbd->func_table[kb_func] = p;
460 kbd_ioctl(struct kbd_data *kbd, struct file *file,
461 unsigned int cmd, unsigned long arg)
463 struct kbdiacrs __user *a;
467 argp = (void __user *)arg;
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.
473 perm = current->signal->tty == kbd->tty || capable(CAP_SYS_TTY_CONFIG);
476 return put_user(KB_101, (char __user *)argp);
479 return do_kdsk_ioctl(kbd, argp, cmd, perm);
482 return do_kdgkb_ioctl(kbd, argp, cmd, perm);
486 if (put_user(kbd->accent_table_size, &a->kb_cnt))
488 ct = kbd->accent_table_size;
489 if (copy_to_user(a->kbdiacr, kbd->accent_table,
490 ct * sizeof(struct kbdiacr)))
497 if (get_user(ct, &a->kb_cnt))
501 kbd->accent_table_size = ct;
502 if (copy_from_user(kbd->accent_table, a->kbdiacr,
503 ct * sizeof(struct kbdiacr)))
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);