- 根目录:
- drivers
- s390
- char
- keyboard.c
/*
* ebcdic keycode functions for s390 console drivers
*
* S390 version
* Copyright IBM Corp. 2003
* 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->port, 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->port, 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->port, 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_port *port, ushort c)
{
if (c < 0x80)
/* 0******* */
kbd_put_queue(port, c);
else if (c < 0x800) {
/* 110***** 10****** */
kbd_put_queue(port, 0xc0 | (c >> 6));
kbd_put_queue(port, 0x80 | (c & 0x3f));
} else {
/* 1110**** 10****** 10****** */
kbd_put_queue(port, 0xe0 | (c >> 12));
kbd_put_queue(port, 0x80 | ((c >> 6) & 0x3f));
kbd_put_queue(port, 0x80 | (c & 0x3f));
}
}
/*
* Process keycode.
*/
void
kbd_keycode(struct kbd_data *kbd, unsigned int keycode)
{
unsigned short keysym;
unsigned char type, value;
if (!kbd)
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->port, 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));
if (!len)
return -EFAULT;
if (len > sizeof(u_kbs->kb_string))
return -EINVAL;
p = kmalloc(len, GFP_KERNEL);
if (!p)
return -ENOMEM;
if (copy_from_user(p, u_kbs->kb_string, len)) {
kfree(p);
return -EFAULT;
}
/*
* Make sure the string is terminated by 0. User could have
* modified it between us running strnlen_user() and copying it.
*/
p[len - 1] = 0;
kfree(kbd->func_table[kb_func]);
kbd->func_table[kb_func] = p;
break;
}
return 0;
}
int kbd_ioctl(struct kbd_data *kbd, unsigned int cmd, unsigned long arg)
{
struct tty_struct *tty;
void __user *argp;
unsigned int ct;
int 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.
*/
tty = tty_port_tty_get(kbd->port);
/* FIXME this test is pretty racy */
perm = current->signal->tty == tty || capable(CAP_SYS_TTY_CONFIG);
tty_kref_put(tty);
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);