[net-next-2.6.git] / drivers / s390 / char / keyboard.c

/*
 *  drivers/s390/char/keyboard.c
 *    ebcdic keycode functions for s390 console drivers
 *
 *  S390 version
 *    Copyright (C) 2003 IBM Deutschland Entwicklung GmbH, IBM Corporation
 *    Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com),
 */

#include <linux/module.h>
#include <linux/sched.h>
#include <linux/sysrq.h>

#include <linux/kbd_kern.h>
#include <linux/kbd_diacr.h>
#include <asm/uaccess.h>

#include "keyboard.h"

/*
 * Handler Tables.
 */
#define K_HANDLERS\
	k_self,		k_fn,		k_spec,		k_ignore,\
	k_dead,		k_ignore,	k_ignore,	k_ignore,\
	k_ignore,	k_ignore,	k_ignore,	k_ignore,\
	k_ignore,	k_ignore,	k_ignore,	k_ignore

typedef void (k_handler_fn)(struct kbd_data *, unsigned char);
static k_handler_fn K_HANDLERS;
static k_handler_fn *k_handler[16] = { K_HANDLERS };

/* maximum values each key_handler can handle */
static const int kbd_max_vals[] = {
	255, ARRAY_SIZE(func_table) - 1, NR_FN_HANDLER - 1, 0,
	NR_DEAD - 1, 0, 0, 0, 0, 0, 0, 0, 0, 0
};
static const int KBD_NR_TYPES = ARRAY_SIZE(kbd_max_vals);

static unsigned char ret_diacr[NR_DEAD] = {
	'`', '\'', '^', '~', '"', ','
};

/*
 * Alloc/free of kbd_data structures.
 */
struct kbd_data *
kbd_alloc(void) {
	struct kbd_data *kbd;
	int i, len;

	kbd = kzalloc(sizeof(struct kbd_data), GFP_KERNEL);
	if (!kbd)
		goto out;
	kbd->key_maps = kzalloc(sizeof(key_maps), GFP_KERNEL);
	if (!kbd->key_maps)
		goto out_kbd;
	for (i = 0; i < ARRAY_SIZE(key_maps); i++) {
		if (key_maps[i]) {
			kbd->key_maps[i] =
				kmalloc(sizeof(u_short)*NR_KEYS, GFP_KERNEL);
			if (!kbd->key_maps[i])
				goto out_maps;
			memcpy(kbd->key_maps[i], key_maps[i],
			       sizeof(u_short)*NR_KEYS);
		}
	}
	kbd->func_table = kzalloc(sizeof(func_table), GFP_KERNEL);
	if (!kbd->func_table)
		goto out_maps;
	for (i = 0; i < ARRAY_SIZE(func_table); i++) {
		if (func_table[i]) {
			len = strlen(func_table[i]) + 1;
			kbd->func_table[i] = kmalloc(len, GFP_KERNEL);
			if (!kbd->func_table[i])
				goto out_func;
			memcpy(kbd->func_table[i], func_table[i], len);
		}
	}
	kbd->fn_handler =
		kzalloc(sizeof(fn_handler_fn *) * NR_FN_HANDLER, GFP_KERNEL);
	if (!kbd->fn_handler)
		goto out_func;
	kbd->accent_table =
		kmalloc(sizeof(struct kbdiacr)*MAX_DIACR, GFP_KERNEL);
	if (!kbd->accent_table)
		goto out_fn_handler;
	memcpy(kbd->accent_table, accent_table,
	       sizeof(struct kbdiacr)*MAX_DIACR);
	kbd->accent_table_size = accent_table_size;
	return kbd;

out_fn_handler:
	kfree(kbd->fn_handler);
out_func:
	for (i = 0; i < ARRAY_SIZE(func_table); i++)
		kfree(kbd->func_table[i]);
	kfree(kbd->func_table);
out_maps:
	for (i = 0; i < ARRAY_SIZE(key_maps); i++)
		kfree(kbd->key_maps[i]);
	kfree(kbd->key_maps);
out_kbd:
	kfree(kbd);
out:
	return NULL;
}

void
kbd_free(struct kbd_data *kbd)
{
	int i;

	kfree(kbd->accent_table);
	kfree(kbd->fn_handler);
	for (i = 0; i < ARRAY_SIZE(func_table); i++)
		kfree(kbd->func_table[i]);
	kfree(kbd->func_table);
	for (i = 0; i < ARRAY_SIZE(key_maps); i++)
		kfree(kbd->key_maps[i]);
	kfree(kbd->key_maps);
	kfree(kbd);
}

/*
 * Generate ascii -> ebcdic translation table from kbd_data.
 */
void
kbd_ascebc(struct kbd_data *kbd, unsigned char *ascebc)
{
	unsigned short *keymap, keysym;
	int i, j, k;

	memset(ascebc, 0x40, 256);
	for (i = 0; i < ARRAY_SIZE(key_maps); i++) {
		keymap = kbd->key_maps[i];
		if (!keymap)
			continue;
		for (j = 0; j < NR_KEYS; j++) {
			k = ((i & 1) << 7) + j;
			keysym = keymap[j];
			if (KTYP(keysym) == (KT_LATIN | 0xf0) ||
			    KTYP(keysym) == (KT_LETTER | 0xf0))
				ascebc[KVAL(keysym)] = k;
			else if (KTYP(keysym) == (KT_DEAD | 0xf0))
				ascebc[ret_diacr[KVAL(keysym)]] = k;
		}
	}
}

#if 0
/*
 * Generate ebcdic -> ascii translation table from kbd_data.
 */
void
kbd_ebcasc(struct kbd_data *kbd, unsigned char *ebcasc)
{
	unsigned short *keymap, keysym;
	int i, j, k;

	memset(ebcasc, ' ', 256);
	for (i = 0; i < ARRAY_SIZE(key_maps); i++) {
		keymap = kbd->key_maps[i];
		if (!keymap)
			continue;
		for (j = 0; j < NR_KEYS; j++) {
			keysym = keymap[j];
			k = ((i & 1) << 7) + j;
			if (KTYP(keysym) == (KT_LATIN | 0xf0) ||
			    KTYP(keysym) == (KT_LETTER | 0xf0))
				ebcasc[k] = KVAL(keysym);
			else if (KTYP(keysym) == (KT_DEAD | 0xf0))
				ebcasc[k] = ret_diacr[KVAL(keysym)];
		}
	}
}
#endif

/*
 * We have a combining character DIACR here, followed by the character CH.
 * If the combination occurs in the table, return the corresponding value.
 * Otherwise, if CH is a space or equals DIACR, return DIACR.
 * Otherwise, conclude that DIACR was not combining after all,
 * queue it and return CH.
 */
static unsigned char
handle_diacr(struct kbd_data *kbd, unsigned char ch)
{
	int i, d;

	d = kbd->diacr;
	kbd->diacr = 0;

	for (i = 0; i < kbd->accent_table_size; i++) {
		if (kbd->accent_table[i].diacr == d &&
		    kbd->accent_table[i].base == ch)
			return kbd->accent_table[i].result;
	}

	if (ch == ' ' || ch == d)
		return d;

	kbd_put_queue(kbd->tty, d);
	return ch;
}

/*
 * Handle dead key.
 */
static void
k_dead(struct kbd_data *kbd, unsigned char value)
{
	value = ret_diacr[value];
	kbd->diacr = (kbd->diacr ? handle_diacr(kbd, value) : value);
}

/*
 * Normal character handler.
 */
static void
k_self(struct kbd_data *kbd, unsigned char value)
{
	if (kbd->diacr)
		value = handle_diacr(kbd, value);
	kbd_put_queue(kbd->tty, value);
}

/*
 * Special key handlers
 */
static void
k_ignore(struct kbd_data *kbd, unsigned char value)
{
}

/*
 * Function key handler.
 */
static void
k_fn(struct kbd_data *kbd, unsigned char value)
{
	if (kbd->func_table[value])
		kbd_puts_queue(kbd->tty, kbd->func_table[value]);
}

static void
k_spec(struct kbd_data *kbd, unsigned char value)
{
	if (value >= NR_FN_HANDLER)
		return;
	if (kbd->fn_handler[value])
		kbd->fn_handler[value](kbd);
}

/*
 * Put utf8 character to tty flip buffer.
 * UTF-8 is defined for words of up to 31 bits,
 * but we need only 16 bits here
 */
static void
to_utf8(struct tty_struct *tty, ushort c) 
{
	if (c < 0x80)
		/*  0******* */
		kbd_put_queue(tty, c);
	else if (c < 0x800) {
		/* 110***** 10****** */
		kbd_put_queue(tty, 0xc0 | (c >> 6));
		kbd_put_queue(tty, 0x80 | (c & 0x3f));
	} else {
		/* 1110**** 10****** 10****** */
		kbd_put_queue(tty, 0xe0 | (c >> 12));
		kbd_put_queue(tty, 0x80 | ((c >> 6) & 0x3f));
		kbd_put_queue(tty, 0x80 | (c & 0x3f));
	}
}

/*
 * Process keycode.
 */
void
kbd_keycode(struct kbd_data *kbd, unsigned int keycode)
{
	unsigned short keysym;
	unsigned char type, value;

	if (!kbd || !kbd->tty)
		return;

	if (keycode >= 384)
		keysym = kbd->key_maps[5][keycode - 384];
	else if (keycode >= 256)
		keysym = kbd->key_maps[4][keycode - 256];
	else if (keycode >= 128)
		keysym = kbd->key_maps[1][keycode - 128];
	else
		keysym = kbd->key_maps[0][keycode];

	type = KTYP(keysym);
	if (type >= 0xf0) {
		type -= 0xf0;
		if (type == KT_LETTER)
			type = KT_LATIN;
		value = KVAL(keysym);
#ifdef CONFIG_MAGIC_SYSRQ	       /* Handle the SysRq Hack */
		if (kbd->sysrq) {
			if (kbd->sysrq == K(KT_LATIN, '-')) {
				kbd->sysrq = 0;
				handle_sysrq(value, kbd->tty);
				return;
			}
			if (value == '-') {
				kbd->sysrq = K(KT_LATIN, '-');
				return;
			}
			/* Incomplete sysrq sequence. */
			(*k_handler[KTYP(kbd->sysrq)])(kbd, KVAL(kbd->sysrq));
			kbd->sysrq = 0;
		} else if ((type == KT_LATIN && value == '^') ||
			   (type == KT_DEAD && ret_diacr[value] == '^')) {
			kbd->sysrq = K(type, value);
			return;
		}
#endif
		(*k_handler[type])(kbd, value);
	} else
		to_utf8(kbd->tty, keysym);
}

/*
 * Ioctl stuff.
 */
static int
do_kdsk_ioctl(struct kbd_data *kbd, struct kbentry __user *user_kbe,
	      int cmd, int perm)
{
	struct kbentry tmp;
	ushort *key_map, val, ov;

	if (copy_from_user(&tmp, user_kbe, sizeof(struct kbentry)))
		return -EFAULT;
#if NR_KEYS < 256
	if (tmp.kb_index >= NR_KEYS)
		return -EINVAL;
#endif
#if MAX_NR_KEYMAPS < 256
	if (tmp.kb_table >= MAX_NR_KEYMAPS)
		return -EINVAL;	
#endif

	switch (cmd) {
	case KDGKBENT:
		key_map = kbd->key_maps[tmp.kb_table];
		if (key_map) {
		    val = U(key_map[tmp.kb_index]);
		    if (KTYP(val) >= KBD_NR_TYPES)
			val = K_HOLE;
		} else
		    val = (tmp.kb_index ? K_HOLE : K_NOSUCHMAP);
		return put_user(val, &user_kbe->kb_value);
	case KDSKBENT:
		if (!perm)
			return -EPERM;
		if (!tmp.kb_index && tmp.kb_value == K_NOSUCHMAP) {
			/* disallocate map */
			key_map = kbd->key_maps[tmp.kb_table];
			if (key_map) {
			    kbd->key_maps[tmp.kb_table] = NULL;
			    kfree(key_map);
			}
			break;
		}

		if (KTYP(tmp.kb_value) >= KBD_NR_TYPES)
			return -EINVAL;
		if (KVAL(tmp.kb_value) > kbd_max_vals[KTYP(tmp.kb_value)])
			return -EINVAL;

		if (!(key_map = kbd->key_maps[tmp.kb_table])) {
			int j;

			key_map = kmalloc(sizeof(plain_map),
						     GFP_KERNEL);
			if (!key_map)
				return -ENOMEM;
			kbd->key_maps[tmp.kb_table] = key_map;
			for (j = 0; j < NR_KEYS; j++)
				key_map[j] = U(K_HOLE);
		}
		ov = U(key_map[tmp.kb_index]);
		if (tmp.kb_value == ov)
			break;	/* nothing to do */
		/*
		 * Attention Key.
		 */
		if (((ov == K_SAK) || (tmp.kb_value == K_SAK)) &&
		    !capable(CAP_SYS_ADMIN))
			return -EPERM;
		key_map[tmp.kb_index] = U(tmp.kb_value);
		break;
	}
	return 0;
}

static int
do_kdgkb_ioctl(struct kbd_data *kbd, struct kbsentry __user *u_kbs,
	       int cmd, int perm)
{
	unsigned char kb_func;
	char *p;
	int len;

	/* Get u_kbs->kb_func. */
	if (get_user(kb_func, &u_kbs->kb_func))
		return -EFAULT;
#if MAX_NR_FUNC < 256
	if (kb_func >= MAX_NR_FUNC)
		return -EINVAL;
#endif

	switch (cmd) {
	case KDGKBSENT:
		p = kbd->func_table[kb_func];
		if (p) {
			len = strlen(p);
			if (len >= sizeof(u_kbs->kb_string))
				len = sizeof(u_kbs->kb_string) - 1;
			if (copy_to_user(u_kbs->kb_string, p, len))
				return -EFAULT;
		} else
			len = 0;
		if (put_user('\0', u_kbs->kb_string + len))
			return -EFAULT;
		break;
	case KDSKBSENT:
		if (!perm)
			return -EPERM;
		len = strnlen_user(u_kbs->kb_string,
				   sizeof(u_kbs->kb_string) - 1);
		if (!len)
			return -EFAULT;
		if (len > sizeof(u_kbs->kb_string) - 1)
			return -EINVAL;
		p = kmalloc(len + 1, GFP_KERNEL);
		if (!p)
			return -ENOMEM;
		if (copy_from_user(p, u_kbs->kb_string, len)) {
			kfree(p);
			return -EFAULT;
		}
		p[len] = 0;
		kfree(kbd->func_table[kb_func]);
		kbd->func_table[kb_func] = p;
		break;
	}
	return 0;
}

int
kbd_ioctl(struct kbd_data *kbd, struct file *file,
	  unsigned int cmd, unsigned long arg)
{
	struct kbdiacrs __user *a;
	void __user *argp;
	int ct, perm;

	argp = (void __user *)arg;

	/*
	 * To have permissions to do most of the vt ioctls, we either have
	 * to be the owner of the tty, or have CAP_SYS_TTY_CONFIG.
	 */
	perm = current->signal->tty == kbd->tty || capable(CAP_SYS_TTY_CONFIG);
	switch (cmd) {
	case KDGKBTYPE:
		return put_user(KB_101, (char __user *)argp);
	case KDGKBENT:
	case KDSKBENT:
		return do_kdsk_ioctl(kbd, argp, cmd, perm);
	case KDGKBSENT:
	case KDSKBSENT:
		return do_kdgkb_ioctl(kbd, argp, cmd, perm);
	case KDGKBDIACR:
		a = argp;

		if (put_user(kbd->accent_table_size, &a->kb_cnt))
			return -EFAULT;
		ct = kbd->accent_table_size;
		if (copy_to_user(a->kbdiacr, kbd->accent_table,
				 ct * sizeof(struct kbdiacr)))
			return -EFAULT;
		return 0;
	case KDSKBDIACR:
		a = argp;
		if (!perm)
			return -EPERM;
		if (get_user(ct, &a->kb_cnt))
			return -EFAULT;
		if (ct >= MAX_DIACR)
			return -EINVAL;
		kbd->accent_table_size = ct;
		if (copy_from_user(kbd->accent_table, a->kbdiacr,
				   ct * sizeof(struct kbdiacr)))
			return -EFAULT;
		return 0;
	default:
		return -ENOIOCTLCMD;
	}
}

EXPORT_SYMBOL(kbd_ioctl);
EXPORT_SYMBOL(kbd_ascebc);
EXPORT_SYMBOL(kbd_free);
EXPORT_SYMBOL(kbd_alloc);
EXPORT_SYMBOL(kbd_keycode);
Commit	Line	Data
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>
	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
88abaab4	52	kbd = kzalloc(sizeof(struct kbd_data), GFP_KERNEL);
1da177e4 LT	53	if (!kbd)
1da177e4 LT	54	goto out;
88abaab4	55	kbd->key_maps = kzalloc(sizeof(key_maps), GFP_KERNEL);
da074d0a	56	if (!kbd->key_maps)
1da177e4	57	goto out_kbd;
1da177e4 LT	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	}
88abaab4	68	kbd->func_table = kzalloc(sizeof(func_table), GFP_KERNEL);
1da177e4 LT	69	if (!kbd->func_table)
1da177e4 LT	70	goto out_maps;
1da177e4 LT	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 =
88abaab4	81	kzalloc(sizeof(fn_handler_fn ) NR_FN_HANDLER, GFP_KERNEL);
1da177e4 LT	82	if (!kbd->fn_handler)
1da177e4 LT	83	goto out_func;
1da177e4 LT	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++)
17fd682e	97	kfree(kbd->func_table[i]);
1da177e4 LT	98	kfree(kbd->func_table);
	99	out_maps:
	100	for (i = 0; i < ARRAY_SIZE(key_maps); i++)
17fd682e	101	kfree(kbd->key_maps[i]);
1da177e4 LT	102	kfree(kbd->key_maps);
	103	out_kbd:
	104	kfree(kbd);
	105	out:
d2c993d8	106	return NULL;
1da177e4 LT	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++)
17fd682e	117	kfree(kbd->func_table[i]);
1da177e4 LT	118	kfree(kbd->func_table);
1da177e4 LT	119	for (i = 0; i < ARRAY_SIZE(key_maps); i++)
17fd682e	120	kfree(kbd->key_maps[i]);
1da177e4 LT	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
2b67fc46	151	#if 0
1da177e4 LT	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	}
2b67fc46	177	#endif
1da177e4 LT	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;
5a489b98	309	handle_sysrq(value, kbd->tty);
1da177e4 LT	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) {
d2c993d8	368	kbd->key_maps[tmp.kb_table] = NULL;
1da177e4 LT	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
5cbded58	382	key_map = kmalloc(sizeof(plain_map),
1da177e4 LT	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);
172411f1 DA	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);
1da177e4 LT	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;
17fd682e	452	kfree(kbd->func_table[kb_func]);
1da177e4 LT	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);