[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/slab.h>
#include <linux/sysrq.h>

#include <linux/consolemap.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;

	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] = kmemdup(key_maps[i],
						   sizeof(u_short) * NR_KEYS,
						   GFP_KERNEL);
			if (!kbd->key_maps[i])
				goto out_maps;
		}
	}
	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]) {
			kbd->func_table[i] = kstrdup(func_table[i],
						     GFP_KERNEL);
			if (!kbd->func_table[i])
				goto out_func;
		}
	}
	kbd->fn_handler =
		kzalloc(sizeof(fn_handler_fn *) * NR_FN_HANDLER, GFP_KERNEL);
	if (!kbd->fn_handler)
		goto out_func;
	kbd->accent_table = kmemdup(accent_table,
				    sizeof(struct kbdiacruc) * MAX_DIACR,
				    GFP_KERNEL);
	if (!kbd->accent_table)
		goto out_fn_handler;
	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 int
handle_diacr(struct kbd_data *kbd, unsigned int 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);
				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)
{
	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:
	{
		struct kbdiacrs __user *a = argp;
		struct kbdiacr diacr;
		int i;

		if (put_user(kbd->accent_table_size, &a->kb_cnt))
			return -EFAULT;
		for (i = 0; i < kbd->accent_table_size; i++) {
			diacr.diacr = kbd->accent_table[i].diacr;
			diacr.base = kbd->accent_table[i].base;
			diacr.result = kbd->accent_table[i].result;
			if (copy_to_user(a->kbdiacr + i, &diacr, sizeof(struct kbdiacr)))
			return -EFAULT;
		}
		return 0;
	}
	case KDGKBDIACRUC:
	{
		struct kbdiacrsuc __user *a = argp;

		ct = kbd->accent_table_size;
		if (put_user(ct, &a->kb_cnt))
			return -EFAULT;
		if (copy_to_user(a->kbdiacruc, kbd->accent_table,
				 ct * sizeof(struct kbdiacruc)))
			return -EFAULT;
		return 0;
	}
	case KDSKBDIACR:
	{
		struct kbdiacrs __user *a = argp;
		struct kbdiacr diacr;
		int i;

		if (!perm)
			return -EPERM;
		if (get_user(ct, &a->kb_cnt))
			return -EFAULT;
		if (ct >= MAX_DIACR)
			return -EINVAL;
		kbd->accent_table_size = ct;
		for (i = 0; i < ct; i++) {
			if (copy_from_user(&diacr, a->kbdiacr + i, sizeof(struct kbdiacr)))
				return -EFAULT;
			kbd->accent_table[i].diacr = diacr.diacr;
			kbd->accent_table[i].base = diacr.base;
			kbd->accent_table[i].result = diacr.result;
		}
		return 0;
	}
	case KDSKBDIACRUC:
	{
		struct kbdiacrsuc __user *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->kbdiacruc,
				   ct * sizeof(struct kbdiacruc)))
			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>
1da177e4 LT	11	#include <linux/sched.h>
5a0e3ad6	12	#include <linux/slab.h>
1da177e4 LT	13	#include <linux/sysrq.h>
1da177e4 LT	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
	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 unsigned char ret_diacr[NR_DEAD] = {
	43	'`', '\'', '^', '~', '"', ','
	44	};
	45
	46	/*
	47	* Alloc/free of kbd_data structures.
	48	*/
	49	struct kbd_data *
	50	kbd_alloc(void) {
	51	struct kbd_data *kbd;
777a5510	52	int i;
1da177e4	53
88abaab4	54	kbd = kzalloc(sizeof(struct kbd_data), GFP_KERNEL);
1da177e4 LT	55	if (!kbd)
1da177e4 LT	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++) {
1da177e4 LT	61	if (key_maps[i]) {
939e379e JL	62	kbd->key_maps[i] = kmemdup(key_maps[i],
	63	sizeof(u_short) * NR_KEYS,
	64	GFP_KERNEL);
1da177e4 LT	65	if (!kbd->key_maps[i])
1da177e4 LT	66	goto out_maps;
1da177e4 LT	67	}
1da177e4 LT	68	}
88abaab4	69	kbd->func_table = kzalloc(sizeof(func_table), GFP_KERNEL);
1da177e4 LT	70	if (!kbd->func_table)
1da177e4 LT	71	goto out_maps;
1da177e4 LT	72	for (i = 0; i < ARRAY_SIZE(func_table); i++) {
1da177e4 LT	73	if (func_table[i]) {
777a5510 JL	74	kbd->func_table[i] = kstrdup(func_table[i],
777a5510 JL	75	GFP_KERNEL);
1da177e4 LT	76	if (!kbd->func_table[i])
1da177e4 LT	77	goto out_func;
1da177e4 LT	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;
939e379e JL	84	kbd->accent_table = kmemdup(accent_table,
	85	sizeof(struct kbdiacruc) * MAX_DIACR,
	86	GFP_KERNEL);
1da177e4 LT	87	if (!kbd->accent_table)
1da177e4 LT	88	goto out_fn_handler;
1da177e4 LT	89	kbd->accent_table_size = accent_table_size;
	90	return kbd;
	91
	92	out_fn_handler:
	93	kfree(kbd->fn_handler);
	94	out_func:
	95	for (i = 0; i < ARRAY_SIZE(func_table); i++)
17fd682e	96	kfree(kbd->func_table[i]);
1da177e4 LT	97	kfree(kbd->func_table);
	98	out_maps:
	99	for (i = 0; i < ARRAY_SIZE(key_maps); i++)
17fd682e	100	kfree(kbd->key_maps[i]);
1da177e4 LT	101	kfree(kbd->key_maps);
	102	out_kbd:
	103	kfree(kbd);
	104	out:
d2c993d8	105	return NULL;
1da177e4 LT	106	}
	107
	108	void
	109	kbd_free(struct kbd_data *kbd)
	110	{
	111	int i;
	112
	113	kfree(kbd->accent_table);
	114	kfree(kbd->fn_handler);
	115	for (i = 0; i < ARRAY_SIZE(func_table); i++)
17fd682e	116	kfree(kbd->func_table[i]);
1da177e4 LT	117	kfree(kbd->func_table);
1da177e4 LT	118	for (i = 0; i < ARRAY_SIZE(key_maps); i++)
17fd682e	119	kfree(kbd->key_maps[i]);
1da177e4 LT	120	kfree(kbd->key_maps);
	121	kfree(kbd);
	122	}
	123
	124	/*
	125	* Generate ascii -> ebcdic translation table from kbd_data.
	126	*/
	127	void
	128	kbd_ascebc(struct kbd_data kbd, unsigned char ascebc)
	129	{
	130	unsigned short *keymap, keysym;
	131	int i, j, k;
	132
	133	memset(ascebc, 0x40, 256);
	134	for (i = 0; i < ARRAY_SIZE(key_maps); i++) {
	135	keymap = kbd->key_maps[i];
	136	if (!keymap)
	137	continue;
	138	for (j = 0; j < NR_KEYS; j++) {
	139	k = ((i & 1) << 7) + j;
	140	keysym = keymap[j];
	141	if (KTYP(keysym) == (KT_LATIN \| 0xf0) \|\|
	142	KTYP(keysym) == (KT_LETTER \| 0xf0))
	143	ascebc[KVAL(keysym)] = k;
	144	else if (KTYP(keysym) == (KT_DEAD \| 0xf0))
	145	ascebc[ret_diacr[KVAL(keysym)]] = k;
	146	}
	147	}
	148	}
	149
2b67fc46	150	#if 0
1da177e4 LT	151	/*
	152	* Generate ebcdic -> ascii translation table from kbd_data.
	153	*/
	154	void
	155	kbd_ebcasc(struct kbd_data kbd, unsigned char ebcasc)
	156	{
	157	unsigned short *keymap, keysym;
	158	int i, j, k;
	159
	160	memset(ebcasc, ' ', 256);
	161	for (i = 0; i < ARRAY_SIZE(key_maps); i++) {
	162	keymap = kbd->key_maps[i];
	163	if (!keymap)
	164	continue;
	165	for (j = 0; j < NR_KEYS; j++) {
	166	keysym = keymap[j];
	167	k = ((i & 1) << 7) + j;
	168	if (KTYP(keysym) == (KT_LATIN \| 0xf0) \|\|
	169	KTYP(keysym) == (KT_LETTER \| 0xf0))
	170	ebcasc[k] = KVAL(keysym);
	171	else if (KTYP(keysym) == (KT_DEAD \| 0xf0))
	172	ebcasc[k] = ret_diacr[KVAL(keysym)];
	173	}
	174	}
	175	}
2b67fc46	176	#endif
1da177e4 LT	177
	178	/*
	179	* We have a combining character DIACR here, followed by the character CH.
	180	* If the combination occurs in the table, return the corresponding value.
	181	* Otherwise, if CH is a space or equals DIACR, return DIACR.
	182	* Otherwise, conclude that DIACR was not combining after all,
	183	* queue it and return CH.
	184	*/
04c71976 ST	185	static unsigned int
04c71976 ST	186	handle_diacr(struct kbd_data *kbd, unsigned int ch)
1da177e4 LT	187	{
	188	int i, d;
	189
	190	d = kbd->diacr;
	191	kbd->diacr = 0;
	192
	193	for (i = 0; i < kbd->accent_table_size; i++) {
	194	if (kbd->accent_table[i].diacr == d &&
	195	kbd->accent_table[i].base == ch)
	196	return kbd->accent_table[i].result;
	197	}
	198
	199	if (ch == ' ' \|\| ch == d)
	200	return d;
	201
	202	kbd_put_queue(kbd->tty, d);
	203	return ch;
	204	}
	205
	206	/*
	207	* Handle dead key.
	208	*/
	209	static void
	210	k_dead(struct kbd_data *kbd, unsigned char value)
	211	{
	212	value = ret_diacr[value];
	213	kbd->diacr = (kbd->diacr ? handle_diacr(kbd, value) : value);
	214	}
	215
	216	/*
	217	* Normal character handler.
	218	*/
	219	static void
	220	k_self(struct kbd_data *kbd, unsigned char value)
	221	{
	222	if (kbd->diacr)
	223	value = handle_diacr(kbd, value);
	224	kbd_put_queue(kbd->tty, value);
	225	}
	226
	227	/*
	228	* Special key handlers
	229	*/
	230	static void
	231	k_ignore(struct kbd_data *kbd, unsigned char value)
	232	{
	233	}
	234
	235	/*
	236	* Function key handler.
	237	*/
	238	static void
	239	k_fn(struct kbd_data *kbd, unsigned char value)
	240	{
	241	if (kbd->func_table[value])
	242	kbd_puts_queue(kbd->tty, kbd->func_table[value]);
	243	}
	244
	245	static void
	246	k_spec(struct kbd_data *kbd, unsigned char value)
	247	{
	248	if (value >= NR_FN_HANDLER)
	249	return;
	250	if (kbd->fn_handler[value])
251	kbd->fn_handler[value](kbd);
252	}
253
254	/*
255	* Put utf8 character to tty flip buffer.
256	* UTF-8 is defined for words of up to 31 bits,
257	* but we need only 16 bits here
258	*/
259	static void
260	to_utf8(struct tty_struct *tty, ushort c)
261	{
262	if (c < 0x80)
263	/* 0******* */
264	kbd_put_queue(tty, c);
265	else if (c < 0x800) {
266	/* 110*** 10**** */
267	kbd_put_queue(tty, 0xc0 \| (c >> 6));
268	kbd_put_queue(tty, 0x80 \| (c & 0x3f));
269	} else {
270	/* 1110** 10** 10**** */
271	kbd_put_queue(tty, 0xe0 \| (c >> 12));
272	kbd_put_queue(tty, 0x80 \| ((c >> 6) & 0x3f));
273	kbd_put_queue(tty, 0x80 \| (c & 0x3f));
274	}
275	}
276
277	/*
278	* Process keycode.
279	*/
280	void
281	kbd_keycode(struct kbd_data *kbd, unsigned int keycode)
282	{
283	unsigned short keysym;
284	unsigned char type, value;
285
286	if (!kbd \|\| !kbd->tty)
287	return;
288
289	if (keycode >= 384)
290	keysym = kbd->key_maps[5][keycode - 384];
291	else if (keycode >= 256)
292	keysym = kbd->key_maps[4][keycode - 256];
293	else if (keycode >= 128)
294	keysym = kbd->key_maps[1][keycode - 128];
295	else
296	keysym = kbd->key_maps[0][keycode];
297
298	type = KTYP(keysym);
299	if (type >= 0xf0) {
300	type -= 0xf0;
301	if (type == KT_LETTER)
302	type = KT_LATIN;
303	value = KVAL(keysym);
304	#ifdef CONFIG_MAGIC_SYSRQ /* Handle the SysRq Hack */
305	if (kbd->sysrq) {
306	if (kbd->sysrq == K(KT_LATIN, '-')) {
307	kbd->sysrq = 0;
f335397d	308	handle_sysrq(value);
1da177e4 LT	309	return;
	310	}
	311	if (value == '-') {
	312	kbd->sysrq = K(KT_LATIN, '-');
	313	return;
	314	}
	315	/* Incomplete sysrq sequence. */
	316	(*k_handler[KTYP(kbd->sysrq)])(kbd, KVAL(kbd->sysrq));
	317	kbd->sysrq = 0;
	318	} else if ((type == KT_LATIN && value == '^') \|\|
	319	(type == KT_DEAD && ret_diacr[value] == '^')) {
	320	kbd->sysrq = K(type, value);
	321	return;
	322	}
	323	#endif
	324	(*k_handler[type])(kbd, value);
	325	} else
	326	to_utf8(kbd->tty, keysym);
	327	}
	328
	329	/*
	330	* Ioctl stuff.
	331	*/
	332	static int
	333	do_kdsk_ioctl(struct kbd_data kbd, struct kbentry __user user_kbe,
	334	int cmd, int perm)
	335	{
	336	struct kbentry tmp;
	337	ushort *key_map, val, ov;
	338
	339	if (copy_from_user(&tmp, user_kbe, sizeof(struct kbentry)))
	340	return -EFAULT;
	341	#if NR_KEYS < 256
	342	if (tmp.kb_index >= NR_KEYS)
	343	return -EINVAL;
	344	#endif
	345	#if MAX_NR_KEYMAPS < 256
	346	if (tmp.kb_table >= MAX_NR_KEYMAPS)
	347	return -EINVAL;
	348	#endif
	349
	350	switch (cmd) {
	351	case KDGKBENT:
	352	key_map = kbd->key_maps[tmp.kb_table];
	353	if (key_map) {
	354	val = U(key_map[tmp.kb_index]);
	355	if (KTYP(val) >= KBD_NR_TYPES)
	356	val = K_HOLE;
	357	} else
	358	val = (tmp.kb_index ? K_HOLE : K_NOSUCHMAP);
	359	return put_user(val, &user_kbe->kb_value);
	360	case KDSKBENT:
	361	if (!perm)
	362	return -EPERM;
	363	if (!tmp.kb_index && tmp.kb_value == K_NOSUCHMAP) {
	364	/* disallocate map */
	365	key_map = kbd->key_maps[tmp.kb_table];
	366	if (key_map) {
d2c993d8	367	kbd->key_maps[tmp.kb_table] = NULL;
1da177e4 LT	368	kfree(key_map);
	369	}
	370	break;
	371	}
	372
	373	if (KTYP(tmp.kb_value) >= KBD_NR_TYPES)
	374	return -EINVAL;
	375	if (KVAL(tmp.kb_value) > kbd_max_vals[KTYP(tmp.kb_value)])
	376	return -EINVAL;
	377
	378	if (!(key_map = kbd->key_maps[tmp.kb_table])) {
	379	int j;
	380
5cbded58	381	key_map = kmalloc(sizeof(plain_map),
1da177e4 LT	382	GFP_KERNEL);
	383	if (!key_map)
	384	return -ENOMEM;
	385	kbd->key_maps[tmp.kb_table] = key_map;
	386	for (j = 0; j < NR_KEYS; j++)
	387	key_map[j] = U(K_HOLE);
	388	}
	389	ov = U(key_map[tmp.kb_index]);
	390	if (tmp.kb_value == ov)
	391	break; /* nothing to do */
	392	/*
	393	* Attention Key.
	394	*/
	395	if (((ov == K_SAK) \|\| (tmp.kb_value == K_SAK)) &&
	396	!capable(CAP_SYS_ADMIN))
	397	return -EPERM;
	398	key_map[tmp.kb_index] = U(tmp.kb_value);
	399	break;
	400	}
	401	return 0;
	402	}
	403
	404	static int
	405	do_kdgkb_ioctl(struct kbd_data kbd, struct kbsentry __user u_kbs,
	406	int cmd, int perm)
	407	{
	408	unsigned char kb_func;
	409	char *p;
	410	int len;
	411
	412	/* Get u_kbs->kb_func. */
	413	if (get_user(kb_func, &u_kbs->kb_func))
	414	return -EFAULT;
	415	#if MAX_NR_FUNC < 256
	416	if (kb_func >= MAX_NR_FUNC)
	417	return -EINVAL;
	418	#endif
	419
	420	switch (cmd) {
	421	case KDGKBSENT:
	422	p = kbd->func_table[kb_func];
	423	if (p) {
	424	len = strlen(p);
	425	if (len >= sizeof(u_kbs->kb_string))
	426	len = sizeof(u_kbs->kb_string) - 1;
	427	if (copy_to_user(u_kbs->kb_string, p, len))
	428	return -EFAULT;
	429	} else
	430	len = 0;
	431	if (put_user('\0', u_kbs->kb_string + len))
	432	return -EFAULT;
	433	break;
	434	case KDSKBSENT:
	435	if (!perm)
	436	return -EPERM;
	437	len = strnlen_user(u_kbs->kb_string,
	438	sizeof(u_kbs->kb_string) - 1);
172411f1 DA	439	if (!len)
	440	return -EFAULT;
	441	if (len > sizeof(u_kbs->kb_string) - 1)
	442	return -EINVAL;
	443	p = kmalloc(len + 1, GFP_KERNEL);
1da177e4 LT	444	if (!p)
	445	return -ENOMEM;
	446	if (copy_from_user(p, u_kbs->kb_string, len)) {
	447	kfree(p);
	448	return -EFAULT;
	449	}
	450	p[len] = 0;
17fd682e	451	kfree(kbd->func_table[kb_func]);
1da177e4 LT	452	kbd->func_table[kb_func] = p;
	453	break;
	454	}
	455	return 0;
	456	}
	457
	458	int
	459	kbd_ioctl(struct kbd_data kbd, struct file file,
	460	unsigned int cmd, unsigned long arg)
	461	{
1da177e4 LT	462	void __user *argp;
	463	int ct, perm;
	464
	465	argp = (void __user *)arg;
	466
	467	/*
	468	* To have permissions to do most of the vt ioctls, we either have
	469	* to be the owner of the tty, or have CAP_SYS_TTY_CONFIG.
	470	*/
	471	perm = current->signal->tty == kbd->tty \|\| capable(CAP_SYS_TTY_CONFIG);
	472	switch (cmd) {
	473	case KDGKBTYPE:
	474	return put_user(KB_101, (char __user *)argp);
	475	case KDGKBENT:
	476	case KDSKBENT:
	477	return do_kdsk_ioctl(kbd, argp, cmd, perm);
	478	case KDGKBSENT:
	479	case KDSKBSENT:
	480	return do_kdgkb_ioctl(kbd, argp, cmd, perm);
	481	case KDGKBDIACR:
04c71976 ST	482	{
	483	struct kbdiacrs __user *a = argp;
	484	struct kbdiacr diacr;
	485	int i;
1da177e4 LT	486
	487	if (put_user(kbd->accent_table_size, &a->kb_cnt))
	488	return -EFAULT;
04c71976 ST	489	for (i = 0; i < kbd->accent_table_size; i++) {
	490	diacr.diacr = kbd->accent_table[i].diacr;
	491	diacr.base = kbd->accent_table[i].base;
	492	diacr.result = kbd->accent_table[i].result;
	493	if (copy_to_user(a->kbdiacr + i, &diacr, sizeof(struct kbdiacr)))
	494	return -EFAULT;
	495	}
	496	return 0;
	497	}
	498	case KDGKBDIACRUC:
	499	{
	500	struct kbdiacrsuc __user *a = argp;
	501
1da177e4	502	ct = kbd->accent_table_size;
04c71976 ST	503	if (put_user(ct, &a->kb_cnt))
	504	return -EFAULT;
	505	if (copy_to_user(a->kbdiacruc, kbd->accent_table,
	506	ct * sizeof(struct kbdiacruc)))
1da177e4 LT	507	return -EFAULT;
1da177e4 LT	508	return 0;
04c71976	509	}
1da177e4	510	case KDSKBDIACR:
04c71976 ST	511	{
	512	struct kbdiacrs __user *a = argp;
	513	struct kbdiacr diacr;
	514	int i;
	515
1da177e4 LT	516	if (!perm)
	517	return -EPERM;
	518	if (get_user(ct, &a->kb_cnt))
	519	return -EFAULT;
	520	if (ct >= MAX_DIACR)
	521	return -EINVAL;
	522	kbd->accent_table_size = ct;
04c71976 ST	523	for (i = 0; i < ct; i++) {
	524	if (copy_from_user(&diacr, a->kbdiacr + i, sizeof(struct kbdiacr)))
	525	return -EFAULT;
	526	kbd->accent_table[i].diacr = diacr.diacr;
	527	kbd->accent_table[i].base = diacr.base;
	528	kbd->accent_table[i].result = diacr.result;
	529	}
	530	return 0;
	531	}
	532	case KDSKBDIACRUC:
	533	{
	534	struct kbdiacrsuc __user *a = argp;
	535
	536	if (!perm)
	537	return -EPERM;
	538	if (get_user(ct, &a->kb_cnt))
	539	return -EFAULT;
	540	if (ct >= MAX_DIACR)
	541	return -EINVAL;
	542	kbd->accent_table_size = ct;
	543	if (copy_from_user(kbd->accent_table, a->kbdiacruc,
	544	ct * sizeof(struct kbdiacruc)))
1da177e4 LT	545	return -EFAULT;
1da177e4 LT	546	return 0;
04c71976	547	}
1da177e4 LT	548	default:
	549	return -ENOIOCTLCMD;
	550	}
	551	}
	552
	553	EXPORT_SYMBOL(kbd_ioctl);
	554	EXPORT_SYMBOL(kbd_ascebc);
	555	EXPORT_SYMBOL(kbd_free);
	556	EXPORT_SYMBOL(kbd_alloc);
	557	EXPORT_SYMBOL(kbd_keycode);