Orange Pi5 kernel

Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards

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orangepi/linux-orangepi-5.10.y.git/trunk/drivers/s390/char/keyboard.c
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// SPDX-License-Identifier: GPL-2.0
/*
 *    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/signal.h>
#include <linux/slab.h>
#include <linux/sysrq.h>
 
#include <linux/consolemap.h>
#include <linux/kbd_kern.h>
#include <linux/kbd_diacr.h>
#include <linux/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 const unsigned char ret_diacr[NR_DEAD] = {
<------>'`',	/* dead_grave */
<------>'\'',	/* dead_acute */
<------>'^',	/* dead_circumflex */
<------>'~',	/* dead_tilda */
<------>'"',	/* dead_diaeresis */
<------>',',	/* dead_cedilla */
<------>'_',	/* dead_macron */
<------>'U',	/* dead_breve */
<------>'.',	/* dead_abovedot */
<------>'*',	/* dead_abovering */
<------>'=',	/* dead_doubleacute */
<------>'c',	/* dead_caron */
<------>'k',	/* dead_ogonek */
<------>'i',	/* dead_iota */
<------>'#',	/* dead_voiced_sound */
<------>'o',	/* dead_semivoiced_sound */
<------>'!',	/* dead_belowdot */
<------>'?',	/* dead_hook */
<------>'+',	/* dead_horn */
<------>'-',	/* dead_stroke */
<------>')',	/* dead_abovecomma */
<------>'(',	/* dead_abovereversedcomma */
<------>':',	/* dead_doublegrave */
<------>'n',	/* dead_invertedbreve */
<------>';',	/* dead_belowcomma */
<------>'$',	/* dead_currency */
<------>'@',	/* dead_greek */
};
 
/*
 * 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(ebc_key_maps), GFP_KERNEL);
<------>if (!kbd->key_maps)
<------><------>goto out_kbd;
<------>for (i = 0; i < ARRAY_SIZE(ebc_key_maps); i++) {
<------><------>if (ebc_key_maps[i]) {
<------><------><------>kbd->key_maps[i] = kmemdup(ebc_key_maps[i],
<------><------><------><------><------><------>   sizeof(u_short) * NR_KEYS,
<------><------><------><------><------><------>   GFP_KERNEL);
<------><------><------>if (!kbd->key_maps[i])
<------><------><------><------>goto out_maps;
<------><------>}
<------>}
<------>kbd->func_table = kzalloc(sizeof(ebc_func_table), GFP_KERNEL);
<------>if (!kbd->func_table)
<------><------>goto out_maps;
<------>for (i = 0; i < ARRAY_SIZE(ebc_func_table); i++) {
<------><------>if (ebc_func_table[i]) {
<------><------><------>kbd->func_table[i] = kstrdup(ebc_func_table[i],
<------><------><------><------><------><------>     GFP_KERNEL);
<------><------><------>if (!kbd->func_table[i])
<------><------><------><------>goto out_func;
<------><------>}
<------>}
<------>kbd->fn_handler =
<------><------>kcalloc(NR_FN_HANDLER, sizeof(fn_handler_fn *), GFP_KERNEL);
<------>if (!kbd->fn_handler)
<------><------>goto out_func;
<------>kbd->accent_table = kmemdup(ebc_accent_table,
<------><------><------><------>    sizeof(struct kbdiacruc) * MAX_DIACR,
<------><------><------><------>    GFP_KERNEL);
<------>if (!kbd->accent_table)
<------><------>goto out_fn_handler;
<------>kbd->accent_table_size = ebc_accent_table_size;
<------>return kbd;
 
out_fn_handler:
<------>kfree(kbd->fn_handler);
out_func:
<------>for (i = 0; i < ARRAY_SIZE(ebc_func_table); i++)
<------><------>kfree(kbd->func_table[i]);
<------>kfree(kbd->func_table);
out_maps:
<------>for (i = 0; i < ARRAY_SIZE(ebc_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(ebc_func_table); i++)
<------><------>kfree(kbd->func_table[i]);
<------>kfree(kbd->func_table);
<------>for (i = 0; i < ARRAY_SIZE(ebc_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(ebc_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(ebc_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;
<------>unsigned long kb_index, kb_table;
<------>ushort *key_map, val, ov;
 
<------>if (copy_from_user(&tmp, user_kbe, sizeof(struct kbentry)))
<------><------>return -EFAULT;
<------>kb_index = (unsigned long) tmp.kb_index;
#if NR_KEYS < 256
<------>if (kb_index >= NR_KEYS)
<------><------>return -EINVAL;
#endif
<------>kb_table = (unsigned long) tmp.kb_table;
#if MAX_NR_KEYMAPS < 256
<------>if (kb_table >= MAX_NR_KEYMAPS)
<------><------>return -EINVAL;	
<------>kb_table = array_index_nospec(kb_table , MAX_NR_KEYMAPS);
#endif
 
<------>switch (cmd) {
<------>case KDGKBENT:
<------><------>key_map = kbd->key_maps[kb_table];
<------><------>if (key_map) {
<------><------>    val = U(key_map[kb_index]);
<------><------>    if (KTYP(val) >= KBD_NR_TYPES)
<------><------><------>val = K_HOLE;
<------><------>} else
<------><------>    val = (kb_index ? K_HOLE : K_NOSUCHMAP);
<------><------>return put_user(val, &user_kbe->kb_value);
<------>case KDSKBENT:
<------><------>if (!perm)
<------><------><------>return -EPERM;
<------><------>if (!kb_index && tmp.kb_value == K_NOSUCHMAP) {
<------><------><------>/* disallocate map */
<------><------><------>key_map = kbd->key_maps[kb_table];
<------><------><------>if (key_map) {
<------><------><------>    kbd->key_maps[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[kb_table])) {
<------><------><------>int j;
 
<------><------><------>key_map = kmalloc(sizeof(plain_map),
<------><------><------><------><------><------>     GFP_KERNEL);
<------><------><------>if (!key_map)
<------><------><------><------>return -ENOMEM;
<------><------><------>kbd->key_maps[kb_table] = key_map;
<------><------><------>for (j = 0; j < NR_KEYS; j++)
<------><------><------><------>key_map[j] = U(K_HOLE);
<------><------>}
<------><------>ov = U(key_map[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[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;
<------><------>p = strndup_user(u_kbs->kb_string, sizeof(u_kbs->kb_string));
<------><------>if (IS_ERR(p))
<------><------><------>return PTR_ERR(p);
<------><------>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);
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