[GitHub/mt8127/android_kernel_alcatel_ttab.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;
		}
	}
}

/*
 * 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)];
		}
	}
}

/*
 * 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
	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	}
	176
	177	/*
	178	* We have a combining character DIACR here, followed by the character CH.
	179	* If the combination occurs in the table, return the corresponding value.
	180	* Otherwise, if CH is a space or equals DIACR, return DIACR.
	181	* Otherwise, conclude that DIACR was not combining after all,
	182	* queue it and return CH.
	183	*/
	184	static unsigned char
185	handle_diacr(struct kbd_data *kbd, unsigned char ch)
186	{
187	int i, d;
188
189	d = kbd->diacr;
190	kbd->diacr = 0;
191
192	for (i = 0; i < kbd->accent_table_size; i++) {
193	if (kbd->accent_table[i].diacr == d &&
194	kbd->accent_table[i].base == ch)
195	return kbd->accent_table[i].result;
196	}
197
198	if (ch == ' ' \|\| ch == d)
199	return d;
200
201	kbd_put_queue(kbd->tty, d);
202	return ch;
203	}
204
205	/*
206	* Handle dead key.
207	*/
208	static void
209	k_dead(struct kbd_data *kbd, unsigned char value)
210	{
211	value = ret_diacr[value];
212	kbd->diacr = (kbd->diacr ? handle_diacr(kbd, value) : value);
213	}
214
215	/*
216	* Normal character handler.
217	*/
218	static void
219	k_self(struct kbd_data *kbd, unsigned char value)
220	{
221	if (kbd->diacr)
222	value = handle_diacr(kbd, value);
223	kbd_put_queue(kbd->tty, value);
224	}
225
226	/*
227	* Special key handlers
228	*/
229	static void
230	k_ignore(struct kbd_data *kbd, unsigned char value)
231	{
232	}
233
234	/*
235	* Function key handler.
236	*/
237	static void
238	k_fn(struct kbd_data *kbd, unsigned char value)
239	{
240	if (kbd->func_table[value])
241	kbd_puts_queue(kbd->tty, kbd->func_table[value]);
242	}
243
244	static void
245	k_spec(struct kbd_data *kbd, unsigned char value)
246	{
247	if (value >= NR_FN_HANDLER)
248	return;
249	if (kbd->fn_handler[value])
250	kbd->fn_handler[value](kbd);
251	}
252
253	/*
254	* Put utf8 character to tty flip buffer.
255	* UTF-8 is defined for words of up to 31 bits,
256	* but we need only 16 bits here
257	*/
258	static void
259	to_utf8(struct tty_struct *tty, ushort c)
260	{
261	if (c < 0x80)
262	/* 0******* */
263	kbd_put_queue(tty, c);
264	else if (c < 0x800) {
265	/* 110*** 10**** */
266	kbd_put_queue(tty, 0xc0 \| (c >> 6));
267	kbd_put_queue(tty, 0x80 \| (c & 0x3f));
268	} else {
269	/* 1110** 10** 10**** */
270	kbd_put_queue(tty, 0xe0 \| (c >> 12));
271	kbd_put_queue(tty, 0x80 \| ((c >> 6) & 0x3f));
272	kbd_put_queue(tty, 0x80 \| (c & 0x3f));
273	}
274	}
275
276	/*
277	* Process keycode.
278	*/
279	void
280	kbd_keycode(struct kbd_data *kbd, unsigned int keycode)
281	{
282	unsigned short keysym;
283	unsigned char type, value;
284
285	if (!kbd \|\| !kbd->tty)
286	return;
287
288	if (keycode >= 384)
289	keysym = kbd->key_maps[5][keycode - 384];
290	else if (keycode >= 256)
291	keysym = kbd->key_maps[4][keycode - 256];
292	else if (keycode >= 128)
293	keysym = kbd->key_maps[1][keycode - 128];
294	else
295	keysym = kbd->key_maps[0][keycode];
296
297	type = KTYP(keysym);
298	if (type >= 0xf0) {
299	type -= 0xf0;
300	if (type == KT_LETTER)
301	type = KT_LATIN;
302	value = KVAL(keysym);
303	#ifdef CONFIG_MAGIC_SYSRQ /* Handle the SysRq Hack */
304	if (kbd->sysrq) {
305	if (kbd->sysrq == K(KT_LATIN, '-')) {
306	kbd->sysrq = 0;
5a489b98	307	handle_sysrq(value, kbd->tty);
1da177e4 LT	308	return;
	309	}
	310	if (value == '-') {
	311	kbd->sysrq = K(KT_LATIN, '-');
	312	return;
	313	}
	314	/* Incomplete sysrq sequence. */
	315	(*k_handler[KTYP(kbd->sysrq)])(kbd, KVAL(kbd->sysrq));
	316	kbd->sysrq = 0;
	317	} else if ((type == KT_LATIN && value == '^') \|\|
	318	(type == KT_DEAD && ret_diacr[value] == '^')) {
	319	kbd->sysrq = K(type, value);
	320	return;
	321	}
	322	#endif
	323	(*k_handler[type])(kbd, value);
	324	} else
	325	to_utf8(kbd->tty, keysym);
	326	}
	327
	328	/*
	329	* Ioctl stuff.
	330	*/
	331	static int
	332	do_kdsk_ioctl(struct kbd_data kbd, struct kbentry __user user_kbe,
	333	int cmd, int perm)
	334	{
	335	struct kbentry tmp;
	336	ushort *key_map, val, ov;
	337
	338	if (copy_from_user(&tmp, user_kbe, sizeof(struct kbentry)))
	339	return -EFAULT;
	340	#if NR_KEYS < 256
	341	if (tmp.kb_index >= NR_KEYS)
	342	return -EINVAL;
	343	#endif
	344	#if MAX_NR_KEYMAPS < 256
	345	if (tmp.kb_table >= MAX_NR_KEYMAPS)
	346	return -EINVAL;
	347	#endif
	348
	349	switch (cmd) {
	350	case KDGKBENT:
	351	key_map = kbd->key_maps[tmp.kb_table];
	352	if (key_map) {
	353	val = U(key_map[tmp.kb_index]);
	354	if (KTYP(val) >= KBD_NR_TYPES)
	355	val = K_HOLE;
	356	} else
	357	val = (tmp.kb_index ? K_HOLE : K_NOSUCHMAP);
	358	return put_user(val, &user_kbe->kb_value);
	359	case KDSKBENT:
	360	if (!perm)
	361	return -EPERM;
	362	if (!tmp.kb_index && tmp.kb_value == K_NOSUCHMAP) {
	363	/* disallocate map */
	364	key_map = kbd->key_maps[tmp.kb_table];
	365	if (key_map) {
d2c993d8	366	kbd->key_maps[tmp.kb_table] = NULL;
1da177e4 LT	367	kfree(key_map);
	368	}
	369	break;
	370	}
	371
	372	if (KTYP(tmp.kb_value) >= KBD_NR_TYPES)
	373	return -EINVAL;
	374	if (KVAL(tmp.kb_value) > kbd_max_vals[KTYP(tmp.kb_value)])
	375	return -EINVAL;
	376
	377	if (!(key_map = kbd->key_maps[tmp.kb_table])) {
	378	int j;
	379
5cbded58	380	key_map = kmalloc(sizeof(plain_map),
1da177e4 LT	381	GFP_KERNEL);
	382	if (!key_map)
	383	return -ENOMEM;
	384	kbd->key_maps[tmp.kb_table] = key_map;
	385	for (j = 0; j < NR_KEYS; j++)
	386	key_map[j] = U(K_HOLE);
	387	}
	388	ov = U(key_map[tmp.kb_index]);
	389	if (tmp.kb_value == ov)
	390	break; /* nothing to do */
	391	/*
	392	* Attention Key.
	393	*/
	394	if (((ov == K_SAK) \|\| (tmp.kb_value == K_SAK)) &&
	395	!capable(CAP_SYS_ADMIN))
	396	return -EPERM;
	397	key_map[tmp.kb_index] = U(tmp.kb_value);
	398	break;
	399	}
	400	return 0;
	401	}
	402
	403	static int
	404	do_kdgkb_ioctl(struct kbd_data kbd, struct kbsentry __user u_kbs,
	405	int cmd, int perm)
	406	{
	407	unsigned char kb_func;
	408	char *p;
	409	int len;
	410
	411	/* Get u_kbs->kb_func. */
	412	if (get_user(kb_func, &u_kbs->kb_func))
	413	return -EFAULT;
	414	#if MAX_NR_FUNC < 256
	415	if (kb_func >= MAX_NR_FUNC)
	416	return -EINVAL;
	417	#endif
	418
	419	switch (cmd) {
	420	case KDGKBSENT:
	421	p = kbd->func_table[kb_func];
	422	if (p) {
	423	len = strlen(p);
	424	if (len >= sizeof(u_kbs->kb_string))
	425	len = sizeof(u_kbs->kb_string) - 1;
	426	if (copy_to_user(u_kbs->kb_string, p, len))
	427	return -EFAULT;
	428	} else
	429	len = 0;
	430	if (put_user('\0', u_kbs->kb_string + len))
	431	return -EFAULT;
	432	break;
	433	case KDSKBSENT:
	434	if (!perm)
	435	return -EPERM;
	436	len = strnlen_user(u_kbs->kb_string,
	437	sizeof(u_kbs->kb_string) - 1);
172411f1 DA	438	if (!len)
	439	return -EFAULT;
	440	if (len > sizeof(u_kbs->kb_string) - 1)
	441	return -EINVAL;
	442	p = kmalloc(len + 1, GFP_KERNEL);
1da177e4 LT	443	if (!p)
	444	return -ENOMEM;
	445	if (copy_from_user(p, u_kbs->kb_string, len)) {
	446	kfree(p);
	447	return -EFAULT;
	448	}
	449	p[len] = 0;
17fd682e	450	kfree(kbd->func_table[kb_func]);
1da177e4 LT	451	kbd->func_table[kb_func] = p;
	452	break;
	453	}
	454	return 0;
	455	}
	456
	457	int
	458	kbd_ioctl(struct kbd_data kbd, struct file file,
	459	unsigned int cmd, unsigned long arg)
	460	{
	461	struct kbdiacrs __user *a;
	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:
	482	a = argp;
	483
	484	if (put_user(kbd->accent_table_size, &a->kb_cnt))
	485	return -EFAULT;
	486	ct = kbd->accent_table_size;
	487	if (copy_to_user(a->kbdiacr, kbd->accent_table,
	488	ct * sizeof(struct kbdiacr)))
	489	return -EFAULT;
	490	return 0;
	491	case KDSKBDIACR:
	492	a = argp;
	493	if (!perm)
	494	return -EPERM;
	495	if (get_user(ct, &a->kb_cnt))
	496	return -EFAULT;
	497	if (ct >= MAX_DIACR)
	498	return -EINVAL;
	499	kbd->accent_table_size = ct;
	500	if (copy_from_user(kbd->accent_table, a->kbdiacr,
	501	ct * sizeof(struct kbdiacr)))
	502	return -EFAULT;
	503	return 0;
	504	default:
	505	return -ENOIOCTLCMD;
	506	}
	507	}
	508
	509	EXPORT_SYMBOL(kbd_ioctl);
	510	EXPORT_SYMBOL(kbd_ascebc);
	511	EXPORT_SYMBOL(kbd_free);
	512	EXPORT_SYMBOL(kbd_alloc);
	513	EXPORT_SYMBOL(kbd_keycode);