diff options
Diffstat (limited to 'drivers/s390/char/keyboard.c')
| -rw-r--r-- | drivers/s390/char/keyboard.c | 579 |
1 files changed, 579 insertions, 0 deletions
diff --git a/drivers/s390/char/keyboard.c b/drivers/s390/char/keyboard.c new file mode 100644 index 000000000..567aedc03 --- /dev/null +++ b/drivers/s390/char/keyboard.c @@ -0,0 +1,579 @@ +// 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); |