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linuxdebug/drivers/tty/vt/keyboard.c

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null pointer error
2024-07-16 15:50:57 +02:00
// SPDX-License-Identifier: GPL-2.0
/*
* Written for linux by Johan Myreen as a translation from
* the assembly version by Linus (with diacriticals added)
*
* Some additional features added by Christoph Niemann (ChN), March 1993
*
* Loadable keymaps by Risto Kankkunen, May 1993
*
* Diacriticals redone & other small changes, aeb@cwi.nl, June 1993
* Added decr/incr_console, dynamic keymaps, Unicode support,
* dynamic function/string keys, led setting, Sept 1994
* `Sticky' modifier keys, 951006.
*
* 11-11-96: SAK should now work in the raw mode (Martin Mares)
*
* Modified to provide 'generic' keyboard support by Hamish Macdonald
* Merge with the m68k keyboard driver and split-off of the PC low-level
* parts by Geert Uytterhoeven, May 1997
*
* 27-05-97: Added support for the Magic SysRq Key (Martin Mares)
* 30-07-98: Dead keys redone, aeb@cwi.nl.
* 21-08-02: Converted to input API, major cleanup. (Vojtech Pavlik)
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/consolemap.h>
#include <linux/init.h>
#include <linux/input.h>
#include <linux/jiffies.h>
#include <linux/kbd_diacr.h>
#include <linux/kbd_kern.h>
#include <linux/leds.h>
#include <linux/mm.h>
#include <linux/module.h>
#include <linux/nospec.h>
#include <linux/notifier.h>
#include <linux/reboot.h>
#include <linux/sched/debug.h>
#include <linux/sched/signal.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/string.h>
#include <linux/tty_flip.h>
#include <linux/tty.h>
#include <linux/uaccess.h>
#include <linux/vt_kern.h>
#include <asm/irq_regs.h>
/*
* Exported functions/variables
*/
#define KBD_DEFMODE (BIT(VC_REPEAT) | BIT(VC_META))
#if defined(CONFIG_X86) || defined(CONFIG_PARISC)
#include <asm/kbdleds.h>
#else
static inline int kbd_defleds(void)
{
return 0;
}
#endif
#define KBD_DEFLOCK 0
/*
* Handler Tables.
*/
#define K_HANDLERS\
k_self, k_fn, k_spec, k_pad,\
k_dead, k_cons, k_cur, k_shift,\
k_meta, k_ascii, k_lock, k_lowercase,\
k_slock, k_dead2, k_brl, k_ignore
typedef void (k_handler_fn)(struct vc_data *vc, unsigned char value,
char up_flag);
static k_handler_fn K_HANDLERS;
static k_handler_fn *k_handler[16] = { K_HANDLERS };
#define FN_HANDLERS\
fn_null, fn_enter, fn_show_ptregs, fn_show_mem,\
fn_show_state, fn_send_intr, fn_lastcons, fn_caps_toggle,\
fn_num, fn_hold, fn_scroll_forw, fn_scroll_back,\
fn_boot_it, fn_caps_on, fn_compose, fn_SAK,\
fn_dec_console, fn_inc_console, fn_spawn_con, fn_bare_num
typedef void (fn_handler_fn)(struct vc_data *vc);
static fn_handler_fn FN_HANDLERS;
static fn_handler_fn *fn_handler[] = { FN_HANDLERS };
/*
* Variables exported for vt_ioctl.c
*/
struct vt_spawn_console vt_spawn_con = {
.lock = __SPIN_LOCK_UNLOCKED(vt_spawn_con.lock),
.pid = NULL,
.sig = 0,
};
/*
* Internal Data.
*/
static struct kbd_struct kbd_table[MAX_NR_CONSOLES];
static struct kbd_struct *kbd = kbd_table;
/* maximum values each key_handler can handle */
static const unsigned char max_vals[] = {
[ KT_LATIN ] = 255,
[ KT_FN ] = ARRAY_SIZE(func_table) - 1,
[ KT_SPEC ] = ARRAY_SIZE(fn_handler) - 1,
[ KT_PAD ] = NR_PAD - 1,
[ KT_DEAD ] = NR_DEAD - 1,
[ KT_CONS ] = 255,
[ KT_CUR ] = 3,
[ KT_SHIFT ] = NR_SHIFT - 1,
[ KT_META ] = 255,
[ KT_ASCII ] = NR_ASCII - 1,
[ KT_LOCK ] = NR_LOCK - 1,
[ KT_LETTER ] = 255,
[ KT_SLOCK ] = NR_LOCK - 1,
[ KT_DEAD2 ] = 255,
[ KT_BRL ] = NR_BRL - 1,
};
static const int NR_TYPES = ARRAY_SIZE(max_vals);
static void kbd_bh(struct tasklet_struct *unused);
static DECLARE_TASKLET_DISABLED(keyboard_tasklet, kbd_bh);
static struct input_handler kbd_handler;
static DEFINE_SPINLOCK(kbd_event_lock);
static DEFINE_SPINLOCK(led_lock);
static DEFINE_SPINLOCK(func_buf_lock); /* guard 'func_buf' and friends */
static DECLARE_BITMAP(key_down, KEY_CNT); /* keyboard key bitmap */
static unsigned char shift_down[NR_SHIFT]; /* shift state counters.. */
static bool dead_key_next;
/* Handles a number being assembled on the number pad */
static bool npadch_active;
static unsigned int npadch_value;
static unsigned int diacr;
static bool rep; /* flag telling character repeat */
static int shift_state = 0;
static unsigned int ledstate = -1U; /* undefined */
static unsigned char ledioctl;
static bool vt_switch;
/*
* Notifier list for console keyboard events
*/
static ATOMIC_NOTIFIER_HEAD(keyboard_notifier_list);
int register_keyboard_notifier(struct notifier_block *nb)
{
return atomic_notifier_chain_register(&keyboard_notifier_list, nb);
}
EXPORT_SYMBOL_GPL(register_keyboard_notifier);
int unregister_keyboard_notifier(struct notifier_block *nb)
{
return atomic_notifier_chain_unregister(&keyboard_notifier_list, nb);
}
EXPORT_SYMBOL_GPL(unregister_keyboard_notifier);
/*
* Translation of scancodes to keycodes. We set them on only the first
* keyboard in the list that accepts the scancode and keycode.
* Explanation for not choosing the first attached keyboard anymore:
* USB keyboards for example have two event devices: one for all "normal"
* keys and one for extra function keys (like "volume up", "make coffee",
* etc.). So this means that scancodes for the extra function keys won't
* be valid for the first event device, but will be for the second.
*/
struct getset_keycode_data {
struct input_keymap_entry ke;
int error;
};
static int getkeycode_helper(struct input_handle *handle, void *data)
{
struct getset_keycode_data *d = data;
d->error = input_get_keycode(handle->dev, &d->ke);
return d->error == 0; /* stop as soon as we successfully get one */
}
static int getkeycode(unsigned int scancode)
{
struct getset_keycode_data d = {
.ke = {
.flags = 0,
.len = sizeof(scancode),
.keycode = 0,
},
.error = -ENODEV,
};
memcpy(d.ke.scancode, &scancode, sizeof(scancode));
input_handler_for_each_handle(&kbd_handler, &d, getkeycode_helper);
return d.error ?: d.ke.keycode;
}
static int setkeycode_helper(struct input_handle *handle, void *data)
{
struct getset_keycode_data *d = data;
d->error = input_set_keycode(handle->dev, &d->ke);
return d->error == 0; /* stop as soon as we successfully set one */
}
static int setkeycode(unsigned int scancode, unsigned int keycode)
{
struct getset_keycode_data d = {
.ke = {
.flags = 0,
.len = sizeof(scancode),
.keycode = keycode,
},
.error = -ENODEV,
};
memcpy(d.ke.scancode, &scancode, sizeof(scancode));
input_handler_for_each_handle(&kbd_handler, &d, setkeycode_helper);
return d.error;
}
/*
* Making beeps and bells. Note that we prefer beeps to bells, but when
* shutting the sound off we do both.
*/
static int kd_sound_helper(struct input_handle *handle, void *data)
{
unsigned int *hz = data;
struct input_dev *dev = handle->dev;
if (test_bit(EV_SND, dev->evbit)) {
if (test_bit(SND_TONE, dev->sndbit)) {
input_inject_event(handle, EV_SND, SND_TONE, *hz);
if (*hz)
return 0;
}
if (test_bit(SND_BELL, dev->sndbit))
input_inject_event(handle, EV_SND, SND_BELL, *hz ? 1 : 0);
}
return 0;
}
static void kd_nosound(struct timer_list *unused)
{
static unsigned int zero;
input_handler_for_each_handle(&kbd_handler, &zero, kd_sound_helper);
}
static DEFINE_TIMER(kd_mksound_timer, kd_nosound);
void kd_mksound(unsigned int hz, unsigned int ticks)
{
del_timer_sync(&kd_mksound_timer);
input_handler_for_each_handle(&kbd_handler, &hz, kd_sound_helper);
if (hz && ticks)
mod_timer(&kd_mksound_timer, jiffies + ticks);
}
EXPORT_SYMBOL(kd_mksound);
/*
* Setting the keyboard rate.
*/
static int kbd_rate_helper(struct input_handle *handle, void *data)
{
struct input_dev *dev = handle->dev;
struct kbd_repeat *rpt = data;
if (test_bit(EV_REP, dev->evbit)) {
if (rpt[0].delay > 0)
input_inject_event(handle,
EV_REP, REP_DELAY, rpt[0].delay);
if (rpt[0].period > 0)
input_inject_event(handle,
EV_REP, REP_PERIOD, rpt[0].period);
rpt[1].delay = dev->rep[REP_DELAY];
rpt[1].period = dev->rep[REP_PERIOD];
}
return 0;
}
int kbd_rate(struct kbd_repeat *rpt)
{
struct kbd_repeat data[2] = { *rpt };
input_handler_for_each_handle(&kbd_handler, data, kbd_rate_helper);
*rpt = data[1]; /* Copy currently used settings */
return 0;
}
/*
* Helper Functions.
*/
static void put_queue(struct vc_data *vc, int ch)
{
tty_insert_flip_char(&vc->port, ch, 0);
tty_flip_buffer_push(&vc->port);
}
static void puts_queue(struct vc_data *vc, const char *cp)
{
tty_insert_flip_string(&vc->port, cp, strlen(cp));
tty_flip_buffer_push(&vc->port);
}
static void applkey(struct vc_data *vc, int key, char mode)
{
static char buf[] = { 0x1b, 'O', 0x00, 0x00 };
buf[1] = (mode ? 'O' : '[');
buf[2] = key;
puts_queue(vc, buf);
}
/*
* Many other routines do put_queue, but I think either
* they produce ASCII, or they produce some user-assigned
* string, and in both cases we might assume that it is
* in utf-8 already.
*/
static void to_utf8(struct vc_data *vc, uint c)
{
if (c < 0x80)
/* 0******* */
put_queue(vc, c);
else if (c < 0x800) {
/* 110***** 10****** */
put_queue(vc, 0xc0 | (c >> 6));
put_queue(vc, 0x80 | (c & 0x3f));
} else if (c < 0x10000) {
if (c >= 0xD800 && c < 0xE000)
return;
if (c == 0xFFFF)
return;
/* 1110**** 10****** 10****** */
put_queue(vc, 0xe0 | (c >> 12));
put_queue(vc, 0x80 | ((c >> 6) & 0x3f));
put_queue(vc, 0x80 | (c & 0x3f));
} else if (c < 0x110000) {
/* 11110*** 10****** 10****** 10****** */
put_queue(vc, 0xf0 | (c >> 18));
put_queue(vc, 0x80 | ((c >> 12) & 0x3f));
put_queue(vc, 0x80 | ((c >> 6) & 0x3f));
put_queue(vc, 0x80 | (c & 0x3f));
}
}
/* FIXME: review locking for vt.c callers */
static void set_leds(void)
{
tasklet_schedule(&keyboard_tasklet);
}
/*
* Called after returning from RAW mode or when changing consoles - recompute
* shift_down[] and shift_state from key_down[] maybe called when keymap is
* undefined, so that shiftkey release is seen. The caller must hold the
* kbd_event_lock.
*/
static void do_compute_shiftstate(void)
{
unsigned int k, sym, val;
shift_state = 0;
memset(shift_down, 0, sizeof(shift_down));
for_each_set_bit(k, key_down, min(NR_KEYS, KEY_CNT)) {
sym = U(key_maps[0][k]);
if (KTYP(sym) != KT_SHIFT && KTYP(sym) != KT_SLOCK)
continue;
val = KVAL(sym);
if (val == KVAL(K_CAPSSHIFT))
val = KVAL(K_SHIFT);
shift_down[val]++;
shift_state |= BIT(val);
}
}
/* We still have to export this method to vt.c */
void vt_set_leds_compute_shiftstate(void)
{
unsigned long flags;
/*
* When VT is switched, the keyboard led needs to be set once.
* Ensure that after the switch is completed, the state of the
* keyboard LED is consistent with the state of the keyboard lock.
*/
vt_switch = true;
set_leds();
spin_lock_irqsave(&kbd_event_lock, flags);
do_compute_shiftstate();
spin_unlock_irqrestore(&kbd_event_lock, flags);
}
/*
* 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 vc_data *vc, unsigned int ch)
{
unsigned int d = diacr;
unsigned int i;
diacr = 0;
if ((d & ~0xff) == BRL_UC_ROW) {
if ((ch & ~0xff) == BRL_UC_ROW)
return d | ch;
} else {
for (i = 0; i < accent_table_size; i++)
if (accent_table[i].diacr == d && accent_table[i].base == ch)
return accent_table[i].result;
}
if (ch == ' ' || ch == (BRL_UC_ROW|0) || ch == d)
return d;
if (kbd->kbdmode == VC_UNICODE)
to_utf8(vc, d);
else {
int c = conv_uni_to_8bit(d);
if (c != -1)
put_queue(vc, c);
}
return ch;
}
/*
* Special function handlers
*/
static void fn_enter(struct vc_data *vc)
{
if (diacr) {
if (kbd->kbdmode == VC_UNICODE)
to_utf8(vc, diacr);
else {
int c = conv_uni_to_8bit(diacr);
if (c != -1)
put_queue(vc, c);
}
diacr = 0;
}
put_queue(vc, '\r');
if (vc_kbd_mode(kbd, VC_CRLF))
put_queue(vc, '\n');
}
static void fn_caps_toggle(struct vc_data *vc)
{
if (rep)
return;
chg_vc_kbd_led(kbd, VC_CAPSLOCK);
}
static void fn_caps_on(struct vc_data *vc)
{
if (rep)
return;
set_vc_kbd_led(kbd, VC_CAPSLOCK);
}
static void fn_show_ptregs(struct vc_data *vc)
{
struct pt_regs *regs = get_irq_regs();
if (regs)
show_regs(regs);
}
static void fn_hold(struct vc_data *vc)
{
struct tty_struct *tty = vc->port.tty;
if (rep || !tty)
return;
/*
* Note: SCROLLOCK will be set (cleared) by stop_tty (start_tty);
* these routines are also activated by ^S/^Q.
* (And SCROLLOCK can also be set by the ioctl KDSKBLED.)
*/
if (tty->flow.stopped)
start_tty(tty);
else
stop_tty(tty);
}
static void fn_num(struct vc_data *vc)
{
if (vc_kbd_mode(kbd, VC_APPLIC))
applkey(vc, 'P', 1);
else
fn_bare_num(vc);
}
/*
* Bind this to Shift-NumLock if you work in application keypad mode
* but want to be able to change the NumLock flag.
* Bind this to NumLock if you prefer that the NumLock key always
* changes the NumLock flag.
*/
static void fn_bare_num(struct vc_data *vc)
{
if (!rep)
chg_vc_kbd_led(kbd, VC_NUMLOCK);
}
static void fn_lastcons(struct vc_data *vc)
{
/* switch to the last used console, ChN */
set_console(last_console);
}
static void fn_dec_console(struct vc_data *vc)
{
int i, cur = fg_console;
/* Currently switching? Queue this next switch relative to that. */
if (want_console != -1)
cur = want_console;
for (i = cur - 1; i != cur; i--) {
if (i == -1)
i = MAX_NR_CONSOLES - 1;
if (vc_cons_allocated(i))
break;
}
set_console(i);
}
static void fn_inc_console(struct vc_data *vc)
{
int i, cur = fg_console;
/* Currently switching? Queue this next switch relative to that. */
if (want_console != -1)
cur = want_console;
for (i = cur+1; i != cur; i++) {
if (i == MAX_NR_CONSOLES)
i = 0;
if (vc_cons_allocated(i))
break;
}
set_console(i);
}
static void fn_send_intr(struct vc_data *vc)
{
tty_insert_flip_char(&vc->port, 0, TTY_BREAK);
tty_flip_buffer_push(&vc->port);
}
static void fn_scroll_forw(struct vc_data *vc)
{
scrollfront(vc, 0);
}
static void fn_scroll_back(struct vc_data *vc)
{
scrollback(vc);
}
static void fn_show_mem(struct vc_data *vc)
{
show_mem(0, NULL);
}
static void fn_show_state(struct vc_data *vc)
{
show_state();
}
static void fn_boot_it(struct vc_data *vc)
{
ctrl_alt_del();
}
static void fn_compose(struct vc_data *vc)
{
dead_key_next = true;
}
static void fn_spawn_con(struct vc_data *vc)
{
spin_lock(&vt_spawn_con.lock);
if (vt_spawn_con.pid)
if (kill_pid(vt_spawn_con.pid, vt_spawn_con.sig, 1)) {
put_pid(vt_spawn_con.pid);
vt_spawn_con.pid = NULL;
}
spin_unlock(&vt_spawn_con.lock);
}
static void fn_SAK(struct vc_data *vc)
{
struct work_struct *SAK_work = &vc_cons[fg_console].SAK_work;
schedule_work(SAK_work);
}
static void fn_null(struct vc_data *vc)
{
do_compute_shiftstate();
}
/*
* Special key handlers
*/
static void k_ignore(struct vc_data *vc, unsigned char value, char up_flag)
{
}
static void k_spec(struct vc_data *vc, unsigned char value, char up_flag)
{
if (up_flag)
return;
if (value >= ARRAY_SIZE(fn_handler))
return;
if ((kbd->kbdmode == VC_RAW ||
kbd->kbdmode == VC_MEDIUMRAW ||
kbd->kbdmode == VC_OFF) &&
value != KVAL(K_SAK))
return; /* SAK is allowed even in raw mode */
fn_handler[value](vc);
}
static void k_lowercase(struct vc_data *vc, unsigned char value, char up_flag)
{
pr_err("k_lowercase was called - impossible\n");
}
static void k_unicode(struct vc_data *vc, unsigned int value, char up_flag)
{
if (up_flag)
return; /* no action, if this is a key release */
if (diacr)
value = handle_diacr(vc, value);
if (dead_key_next) {
dead_key_next = false;
diacr = value;
return;
}
if (kbd->kbdmode == VC_UNICODE)
to_utf8(vc, value);
else {
int c = conv_uni_to_8bit(value);
if (c != -1)
put_queue(vc, c);
}
}
/*
* Handle dead key. Note that we now may have several
* dead keys modifying the same character. Very useful
* for Vietnamese.
*/
static void k_deadunicode(struct vc_data *vc, unsigned int value, char up_flag)
{
if (up_flag)
return;
diacr = (diacr ? handle_diacr(vc, value) : value);
}
static void k_self(struct vc_data *vc, unsigned char value, char up_flag)
{
k_unicode(vc, conv_8bit_to_uni(value), up_flag);
}
static void k_dead2(struct vc_data *vc, unsigned char value, char up_flag)
{
k_deadunicode(vc, value, up_flag);
}
/*
* Obsolete - for backwards compatibility only
*/
static void k_dead(struct vc_data *vc, unsigned char value, char up_flag)
{
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 */
};
k_deadunicode(vc, ret_diacr[value], up_flag);
}
static void k_cons(struct vc_data *vc, unsigned char value, char up_flag)
{
if (up_flag)
return;
set_console(value);
}
static void k_fn(struct vc_data *vc, unsigned char value, char up_flag)
{
if (up_flag)
return;
if ((unsigned)value < ARRAY_SIZE(func_table)) {
unsigned long flags;
spin_lock_irqsave(&func_buf_lock, flags);
if (func_table[value])
puts_queue(vc, func_table[value]);
spin_unlock_irqrestore(&func_buf_lock, flags);
} else
pr_err("k_fn called with value=%d\n", value);
}
static void k_cur(struct vc_data *vc, unsigned char value, char up_flag)
{
static const char cur_chars[] = "BDCA";
if (up_flag)
return;
applkey(vc, cur_chars[value], vc_kbd_mode(kbd, VC_CKMODE));
}
static void k_pad(struct vc_data *vc, unsigned char value, char up_flag)
{
static const char pad_chars[] = "0123456789+-*/\015,.?()#";
static const char app_map[] = "pqrstuvwxylSRQMnnmPQS";
if (up_flag)
return; /* no action, if this is a key release */
/* kludge... shift forces cursor/number keys */
if (vc_kbd_mode(kbd, VC_APPLIC) && !shift_down[KG_SHIFT]) {
applkey(vc, app_map[value], 1);
return;
}
if (!vc_kbd_led(kbd, VC_NUMLOCK)) {
switch (value) {
case KVAL(K_PCOMMA):
case KVAL(K_PDOT):
k_fn(vc, KVAL(K_REMOVE), 0);
return;
case KVAL(K_P0):
k_fn(vc, KVAL(K_INSERT), 0);
return;
case KVAL(K_P1):
k_fn(vc, KVAL(K_SELECT), 0);
return;
case KVAL(K_P2):
k_cur(vc, KVAL(K_DOWN), 0);
return;
case KVAL(K_P3):
k_fn(vc, KVAL(K_PGDN), 0);
return;
case KVAL(K_P4):
k_cur(vc, KVAL(K_LEFT), 0);
return;
case KVAL(K_P6):
k_cur(vc, KVAL(K_RIGHT), 0);
return;
case KVAL(K_P7):
k_fn(vc, KVAL(K_FIND), 0);
return;
case KVAL(K_P8):
k_cur(vc, KVAL(K_UP), 0);
return;
case KVAL(K_P9):
k_fn(vc, KVAL(K_PGUP), 0);
return;
case KVAL(K_P5):
applkey(vc, 'G', vc_kbd_mode(kbd, VC_APPLIC));
return;
}
}
put_queue(vc, pad_chars[value]);
if (value == KVAL(K_PENTER) && vc_kbd_mode(kbd, VC_CRLF))
put_queue(vc, '\n');
}
static void k_shift(struct vc_data *vc, unsigned char value, char up_flag)
{
int old_state = shift_state;
if (rep)
return;
/*
* Mimic typewriter:
* a CapsShift key acts like Shift but undoes CapsLock
*/
if (value == KVAL(K_CAPSSHIFT)) {
value = KVAL(K_SHIFT);
if (!up_flag)
clr_vc_kbd_led(kbd, VC_CAPSLOCK);
}
if (up_flag) {
/*
* handle the case that two shift or control
* keys are depressed simultaneously
*/
if (shift_down[value])
shift_down[value]--;
} else
shift_down[value]++;
if (shift_down[value])
shift_state |= BIT(value);
else
shift_state &= ~BIT(value);
/* kludge */
if (up_flag && shift_state != old_state && npadch_active) {
if (kbd->kbdmode == VC_UNICODE)
to_utf8(vc, npadch_value);
else
put_queue(vc, npadch_value & 0xff);
npadch_active = false;
}
}
static void k_meta(struct vc_data *vc, unsigned char value, char up_flag)
{
if (up_flag)
return;
if (vc_kbd_mode(kbd, VC_META)) {
put_queue(vc, '\033');
put_queue(vc, value);
} else
put_queue(vc, value | BIT(7));
}
static void k_ascii(struct vc_data *vc, unsigned char value, char up_flag)
{
unsigned int base;
if (up_flag)
return;
if (value < 10) {
/* decimal input of code, while Alt depressed */
base = 10;
} else {
/* hexadecimal input of code, while AltGr depressed */
value -= 10;
base = 16;
}
if (!npadch_active) {
npadch_value = 0;
npadch_active = true;
}
npadch_value = npadch_value * base + value;
}
static void k_lock(struct vc_data *vc, unsigned char value, char up_flag)
{
if (up_flag || rep)
return;
chg_vc_kbd_lock(kbd, value);
}
static void k_slock(struct vc_data *vc, unsigned char value, char up_flag)
{
k_shift(vc, value, up_flag);
if (up_flag || rep)
return;
chg_vc_kbd_slock(kbd, value);
/* try to make Alt, oops, AltGr and such work */
if (!key_maps[kbd->lockstate ^ kbd->slockstate]) {
kbd->slockstate = 0;
chg_vc_kbd_slock(kbd, value);
}
}
/* by default, 300ms interval for combination release */
static unsigned brl_timeout = 300;
MODULE_PARM_DESC(brl_timeout, "Braille keys release delay in ms (0 for commit on first key release)");
module_param(brl_timeout, uint, 0644);
static unsigned brl_nbchords = 1;
MODULE_PARM_DESC(brl_nbchords, "Number of chords that produce a braille pattern (0 for dead chords)");
module_param(brl_nbchords, uint, 0644);
static void k_brlcommit(struct vc_data *vc, unsigned int pattern, char up_flag)
{
static unsigned long chords;
static unsigned committed;
if (!brl_nbchords)
k_deadunicode(vc, BRL_UC_ROW | pattern, up_flag);
else {
committed |= pattern;
chords++;
if (chords == brl_nbchords) {
k_unicode(vc, BRL_UC_ROW | committed, up_flag);
chords = 0;
committed = 0;
}
}
}
static void k_brl(struct vc_data *vc, unsigned char value, char up_flag)
{
static unsigned pressed, committing;
static unsigned long releasestart;
if (kbd->kbdmode != VC_UNICODE) {
if (!up_flag)
pr_warn("keyboard mode must be unicode for braille patterns\n");
return;
}
if (!value) {
k_unicode(vc, BRL_UC_ROW, up_flag);
return;
}
if (value > 8)
return;
if (!up_flag) {
pressed |= BIT(value - 1);
if (!brl_timeout)
committing = pressed;
} else if (brl_timeout) {
if (!committing ||
time_after(jiffies,
releasestart + msecs_to_jiffies(brl_timeout))) {
committing = pressed;
releasestart = jiffies;
}
pressed &= ~BIT(value - 1);
if (!pressed && committing) {
k_brlcommit(vc, committing, 0);
committing = 0;
}
} else {
if (committing) {
k_brlcommit(vc, committing, 0);
committing = 0;
}
pressed &= ~BIT(value - 1);
}
}
#if IS_ENABLED(CONFIG_INPUT_LEDS) && IS_ENABLED(CONFIG_LEDS_TRIGGERS)
struct kbd_led_trigger {
struct led_trigger trigger;
unsigned int mask;
};
static int kbd_led_trigger_activate(struct led_classdev *cdev)
{
struct kbd_led_trigger *trigger =
container_of(cdev->trigger, struct kbd_led_trigger, trigger);
tasklet_disable(&keyboard_tasklet);
if (ledstate != -1U)
led_trigger_event(&trigger->trigger,
ledstate & trigger->mask ?
LED_FULL : LED_OFF);
tasklet_enable(&keyboard_tasklet);
return 0;
}
#define KBD_LED_TRIGGER(_led_bit, _name) { \
.trigger = { \
.name = _name, \
.activate = kbd_led_trigger_activate, \
}, \
.mask = BIT(_led_bit), \
}
#define KBD_LOCKSTATE_TRIGGER(_led_bit, _name) \
KBD_LED_TRIGGER((_led_bit) + 8, _name)
static struct kbd_led_trigger kbd_led_triggers[] = {
KBD_LED_TRIGGER(VC_SCROLLOCK, "kbd-scrolllock"),
KBD_LED_TRIGGER(VC_NUMLOCK, "kbd-numlock"),
KBD_LED_TRIGGER(VC_CAPSLOCK, "kbd-capslock"),
KBD_LED_TRIGGER(VC_KANALOCK, "kbd-kanalock"),
KBD_LOCKSTATE_TRIGGER(VC_SHIFTLOCK, "kbd-shiftlock"),
KBD_LOCKSTATE_TRIGGER(VC_ALTGRLOCK, "kbd-altgrlock"),
KBD_LOCKSTATE_TRIGGER(VC_CTRLLOCK, "kbd-ctrllock"),
KBD_LOCKSTATE_TRIGGER(VC_ALTLOCK, "kbd-altlock"),
KBD_LOCKSTATE_TRIGGER(VC_SHIFTLLOCK, "kbd-shiftllock"),
KBD_LOCKSTATE_TRIGGER(VC_SHIFTRLOCK, "kbd-shiftrlock"),
KBD_LOCKSTATE_TRIGGER(VC_CTRLLLOCK, "kbd-ctrlllock"),
KBD_LOCKSTATE_TRIGGER(VC_CTRLRLOCK, "kbd-ctrlrlock"),
};
static void kbd_propagate_led_state(unsigned int old_state,
unsigned int new_state)
{
struct kbd_led_trigger *trigger;
unsigned int changed = old_state ^ new_state;
int i;
for (i = 0; i < ARRAY_SIZE(kbd_led_triggers); i++) {
trigger = &kbd_led_triggers[i];
if (changed & trigger->mask)
led_trigger_event(&trigger->trigger,
new_state & trigger->mask ?
LED_FULL : LED_OFF);
}
}
static int kbd_update_leds_helper(struct input_handle *handle, void *data)
{
unsigned int led_state = *(unsigned int *)data;
if (test_bit(EV_LED, handle->dev->evbit))
kbd_propagate_led_state(~led_state, led_state);
return 0;
}
static void kbd_init_leds(void)
{
int error;
int i;
for (i = 0; i < ARRAY_SIZE(kbd_led_triggers); i++) {
error = led_trigger_register(&kbd_led_triggers[i].trigger);
if (error)
pr_err("error %d while registering trigger %s\n",
error, kbd_led_triggers[i].trigger.name);
}
}
#else
static int kbd_update_leds_helper(struct input_handle *handle, void *data)
{
unsigned int leds = *(unsigned int *)data;
if (test_bit(EV_LED, handle->dev->evbit)) {
input_inject_event(handle, EV_LED, LED_SCROLLL, !!(leds & BIT(0)));
input_inject_event(handle, EV_LED, LED_NUML, !!(leds & BIT(1)));
input_inject_event(handle, EV_LED, LED_CAPSL, !!(leds & BIT(2)));
input_inject_event(handle, EV_SYN, SYN_REPORT, 0);
}
return 0;
}
static void kbd_propagate_led_state(unsigned int old_state,
unsigned int new_state)
{
input_handler_for_each_handle(&kbd_handler, &new_state,
kbd_update_leds_helper);
}
static void kbd_init_leds(void)
{
}
#endif
/*
* The leds display either (i) the status of NumLock, CapsLock, ScrollLock,
* or (ii) whatever pattern of lights people want to show using KDSETLED,
* or (iii) specified bits of specified words in kernel memory.
*/
static unsigned char getledstate(void)
{
return ledstate & 0xff;
}
void setledstate(struct kbd_struct *kb, unsigned int led)
{
unsigned long flags;
spin_lock_irqsave(&led_lock, flags);
if (!(led & ~7)) {
ledioctl = led;
kb->ledmode = LED_SHOW_IOCTL;
} else
kb->ledmode = LED_SHOW_FLAGS;
set_leds();
spin_unlock_irqrestore(&led_lock, flags);
}
static inline unsigned char getleds(void)
{
struct kbd_struct *kb = kbd_table + fg_console;
if (kb->ledmode == LED_SHOW_IOCTL)
return ledioctl;
return kb->ledflagstate;
}
/**
* vt_get_leds - helper for braille console
* @console: console to read
* @flag: flag we want to check
*
* Check the status of a keyboard led flag and report it back
*/
int vt_get_leds(unsigned int console, int flag)
{
struct kbd_struct *kb = &kbd_table[console];
int ret;
unsigned long flags;
spin_lock_irqsave(&led_lock, flags);
ret = vc_kbd_led(kb, flag);
spin_unlock_irqrestore(&led_lock, flags);
return ret;
}
EXPORT_SYMBOL_GPL(vt_get_leds);
/**
* vt_set_led_state - set LED state of a console
* @console: console to set
* @leds: LED bits
*
* Set the LEDs on a console. This is a wrapper for the VT layer
* so that we can keep kbd knowledge internal
*/
void vt_set_led_state(unsigned int console, int leds)
{
struct kbd_struct *kb = &kbd_table[console];
setledstate(kb, leds);
}
/**
* vt_kbd_con_start - Keyboard side of console start
* @console: console
*
* Handle console start. This is a wrapper for the VT layer
* so that we can keep kbd knowledge internal
*
* FIXME: We eventually need to hold the kbd lock here to protect
* the LED updating. We can't do it yet because fn_hold calls stop_tty
* and start_tty under the kbd_event_lock, while normal tty paths
* don't hold the lock. We probably need to split out an LED lock
* but not during an -rc release!
*/
void vt_kbd_con_start(unsigned int console)
{
struct kbd_struct *kb = &kbd_table[console];
unsigned long flags;
spin_lock_irqsave(&led_lock, flags);
clr_vc_kbd_led(kb, VC_SCROLLOCK);
set_leds();
spin_unlock_irqrestore(&led_lock, flags);
}
/**
* vt_kbd_con_stop - Keyboard side of console stop
* @console: console
*
* Handle console stop. This is a wrapper for the VT layer
* so that we can keep kbd knowledge internal
*/
void vt_kbd_con_stop(unsigned int console)
{
struct kbd_struct *kb = &kbd_table[console];
unsigned long flags;
spin_lock_irqsave(&led_lock, flags);
set_vc_kbd_led(kb, VC_SCROLLOCK);
set_leds();
spin_unlock_irqrestore(&led_lock, flags);
}
/*
* This is the tasklet that updates LED state of LEDs using standard
* keyboard triggers. The reason we use tasklet is that we need to
* handle the scenario when keyboard handler is not registered yet
* but we already getting updates from the VT to update led state.
*/
static void kbd_bh(struct tasklet_struct *unused)
{
unsigned int leds;
unsigned long flags;
spin_lock_irqsave(&led_lock, flags);
leds = getleds();
leds |= (unsigned int)kbd->lockstate << 8;
spin_unlock_irqrestore(&led_lock, flags);
if (vt_switch) {
ledstate = ~leds;
vt_switch = false;
}
if (leds != ledstate) {
kbd_propagate_led_state(ledstate, leds);
ledstate = leds;
}
}
#if defined(CONFIG_X86) || defined(CONFIG_IA64) || defined(CONFIG_ALPHA) ||\
defined(CONFIG_MIPS) || defined(CONFIG_PPC) || defined(CONFIG_SPARC) ||\
defined(CONFIG_PARISC) || defined(CONFIG_SUPERH) ||\
(defined(CONFIG_ARM) && defined(CONFIG_KEYBOARD_ATKBD) && !defined(CONFIG_ARCH_RPC))
static inline bool kbd_is_hw_raw(const struct input_dev *dev)
{
if (!test_bit(EV_MSC, dev->evbit) || !test_bit(MSC_RAW, dev->mscbit))
return false;
return dev->id.bustype == BUS_I8042 &&
dev->id.vendor == 0x0001 && dev->id.product == 0x0001;
}
static const unsigned short x86_keycodes[256] =
{ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15,
16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31,
32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47,
48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63,
64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79,
80, 81, 82, 83, 84,118, 86, 87, 88,115,120,119,121,112,123, 92,
284,285,309, 0,312, 91,327,328,329,331,333,335,336,337,338,339,
367,288,302,304,350, 89,334,326,267,126,268,269,125,347,348,349,
360,261,262,263,268,376,100,101,321,316,373,286,289,102,351,355,
103,104,105,275,287,279,258,106,274,107,294,364,358,363,362,361,
291,108,381,281,290,272,292,305,280, 99,112,257,306,359,113,114,
264,117,271,374,379,265,266, 93, 94, 95, 85,259,375,260, 90,116,
377,109,111,277,278,282,283,295,296,297,299,300,301,293,303,307,
308,310,313,314,315,317,318,319,320,357,322,323,324,325,276,330,
332,340,365,342,343,344,345,346,356,270,341,368,369,370,371,372 };
#ifdef CONFIG_SPARC
static int sparc_l1_a_state;
extern void sun_do_break(void);
#endif
static int emulate_raw(struct vc_data *vc, unsigned int keycode,
unsigned char up_flag)
{
int code;
switch (keycode) {
case KEY_PAUSE:
put_queue(vc, 0xe1);
put_queue(vc, 0x1d | up_flag);
put_queue(vc, 0x45 | up_flag);
break;
case KEY_HANGEUL:
if (!up_flag)
put_queue(vc, 0xf2);
break;
case KEY_HANJA:
if (!up_flag)
put_queue(vc, 0xf1);
break;
case KEY_SYSRQ:
/*
* Real AT keyboards (that's what we're trying
* to emulate here) emit 0xe0 0x2a 0xe0 0x37 when
* pressing PrtSc/SysRq alone, but simply 0x54
* when pressing Alt+PrtSc/SysRq.
*/
if (test_bit(KEY_LEFTALT, key_down) ||
test_bit(KEY_RIGHTALT, key_down)) {
put_queue(vc, 0x54 | up_flag);
} else {
put_queue(vc, 0xe0);
put_queue(vc, 0x2a | up_flag);
put_queue(vc, 0xe0);
put_queue(vc, 0x37 | up_flag);
}
break;
default:
if (keycode > 255)
return -1;
code = x86_keycodes[keycode];
if (!code)
return -1;
if (code & 0x100)
put_queue(vc, 0xe0);
put_queue(vc, (code & 0x7f) | up_flag);
break;
}
return 0;
}
#else
static inline bool kbd_is_hw_raw(const struct input_dev *dev)
{
return false;
}
static int emulate_raw(struct vc_data *vc, unsigned int keycode, unsigned char up_flag)
{
if (keycode > 127)
return -1;
put_queue(vc, keycode | up_flag);
return 0;
}
#endif
static void kbd_rawcode(unsigned char data)
{
struct vc_data *vc = vc_cons[fg_console].d;
kbd = &kbd_table[vc->vc_num];
if (kbd->kbdmode == VC_RAW)
put_queue(vc, data);
}
static void kbd_keycode(unsigned int keycode, int down, bool hw_raw)
{
struct vc_data *vc = vc_cons[fg_console].d;
unsigned short keysym, *key_map;
unsigned char type;
bool raw_mode;
struct tty_struct *tty;
int shift_final;
struct keyboard_notifier_param param = { .vc = vc, .value = keycode, .down = down };
int rc;
tty = vc->port.tty;
if (tty && (!tty->driver_data)) {
/* No driver data? Strange. Okay we fix it then. */
tty->driver_data = vc;
}
kbd = &kbd_table[vc->vc_num];
#ifdef CONFIG_SPARC
if (keycode == KEY_STOP)
sparc_l1_a_state = down;
#endif
rep = (down == 2);
raw_mode = (kbd->kbdmode == VC_RAW);
if (raw_mode && !hw_raw)
if (emulate_raw(vc, keycode, !down << 7))
if (keycode < BTN_MISC && printk_ratelimit())
pr_warn("can't emulate rawmode for keycode %d\n",
keycode);
#ifdef CONFIG_SPARC
if (keycode == KEY_A && sparc_l1_a_state) {
sparc_l1_a_state = false;
sun_do_break();
}
#endif
if (kbd->kbdmode == VC_MEDIUMRAW) {
/*
* This is extended medium raw mode, with keys above 127
* encoded as 0, high 7 bits, low 7 bits, with the 0 bearing
* the 'up' flag if needed. 0 is reserved, so this shouldn't
* interfere with anything else. The two bytes after 0 will
* always have the up flag set not to interfere with older
* applications. This allows for 16384 different keycodes,
* which should be enough.
*/
if (keycode < 128) {
put_queue(vc, keycode | (!down << 7));
} else {
put_queue(vc, !down << 7);
put_queue(vc, (keycode >> 7) | BIT(7));
put_queue(vc, keycode | BIT(7));
}
raw_mode = true;
}
assign_bit(keycode, key_down, down);
if (rep &&
(!vc_kbd_mode(kbd, VC_REPEAT) ||
(tty && !L_ECHO(tty) && tty_chars_in_buffer(tty)))) {
/*
* Don't repeat a key if the input buffers are not empty and the
* characters get aren't echoed locally. This makes key repeat
* usable with slow applications and under heavy loads.
*/
return;
}
param.shift = shift_final = (shift_state | kbd->slockstate) ^ kbd->lockstate;
param.ledstate = kbd->ledflagstate;
key_map = key_maps[shift_final];
rc = atomic_notifier_call_chain(&keyboard_notifier_list,
KBD_KEYCODE, &param);
if (rc == NOTIFY_STOP || !key_map) {
atomic_notifier_call_chain(&keyboard_notifier_list,
KBD_UNBOUND_KEYCODE, &param);
do_compute_shiftstate();
kbd->slockstate = 0;
return;
}
if (keycode < NR_KEYS)
keysym = key_map[keycode];
else if (keycode >= KEY_BRL_DOT1 && keycode <= KEY_BRL_DOT8)
keysym = U(K(KT_BRL, keycode - KEY_BRL_DOT1 + 1));
else
return;
type = KTYP(keysym);
if (type < 0xf0) {
param.value = keysym;
rc = atomic_notifier_call_chain(&keyboard_notifier_list,
KBD_UNICODE, &param);
if (rc != NOTIFY_STOP)
if (down && !raw_mode)
k_unicode(vc, keysym, !down);
return;
}
type -= 0xf0;
if (type == KT_LETTER) {
type = KT_LATIN;
if (vc_kbd_led(kbd, VC_CAPSLOCK)) {
key_map = key_maps[shift_final ^ BIT(KG_SHIFT)];
if (key_map)
keysym = key_map[keycode];
}
}
param.value = keysym;
rc = atomic_notifier_call_chain(&keyboard_notifier_list,
KBD_KEYSYM, &param);
if (rc == NOTIFY_STOP)
return;
if ((raw_mode || kbd->kbdmode == VC_OFF) && type != KT_SPEC && type != KT_SHIFT)
return;
(*k_handler[type])(vc, keysym & 0xff, !down);
param.ledstate = kbd->ledflagstate;
atomic_notifier_call_chain(&keyboard_notifier_list, KBD_POST_KEYSYM, &param);
if (type != KT_SLOCK)
kbd->slockstate = 0;
}
static void kbd_event(struct input_handle *handle, unsigned int event_type,
unsigned int event_code, int value)
{
/* We are called with interrupts disabled, just take the lock */
spin_lock(&kbd_event_lock);
if (event_type == EV_MSC && event_code == MSC_RAW &&
kbd_is_hw_raw(handle->dev))
kbd_rawcode(value);
if (event_type == EV_KEY && event_code <= KEY_MAX)
kbd_keycode(event_code, value, kbd_is_hw_raw(handle->dev));
spin_unlock(&kbd_event_lock);
tasklet_schedule(&keyboard_tasklet);
do_poke_blanked_console = 1;
schedule_console_callback();
}
static bool kbd_match(struct input_handler *handler, struct input_dev *dev)
{
if (test_bit(EV_SND, dev->evbit))
return true;
if (test_bit(EV_KEY, dev->evbit)) {
if (find_next_bit(dev->keybit, BTN_MISC, KEY_RESERVED) <
BTN_MISC)
return true;
if (find_next_bit(dev->keybit, KEY_BRL_DOT10 + 1,
KEY_BRL_DOT1) <= KEY_BRL_DOT10)
return true;
}
return false;
}
/*
* When a keyboard (or other input device) is found, the kbd_connect
* function is called. The function then looks at the device, and if it
* likes it, it can open it and get events from it. In this (kbd_connect)
* function, we should decide which VT to bind that keyboard to initially.
*/
static int kbd_connect(struct input_handler *handler, struct input_dev *dev,
const struct input_device_id *id)
{
struct input_handle *handle;
int error;
handle = kzalloc(sizeof(struct input_handle), GFP_KERNEL);
if (!handle)
return -ENOMEM;
handle->dev = dev;
handle->handler = handler;
handle->name = "kbd";
error = input_register_handle(handle);
if (error)
goto err_free_handle;
error = input_open_device(handle);
if (error)
goto err_unregister_handle;
return 0;
err_unregister_handle:
input_unregister_handle(handle);
err_free_handle:
kfree(handle);
return error;
}
static void kbd_disconnect(struct input_handle *handle)
{
input_close_device(handle);
input_unregister_handle(handle);
kfree(handle);
}
/*
* Start keyboard handler on the new keyboard by refreshing LED state to
* match the rest of the system.
*/
static void kbd_start(struct input_handle *handle)
{
tasklet_disable(&keyboard_tasklet);
if (ledstate != -1U)
kbd_update_leds_helper(handle, &ledstate);
tasklet_enable(&keyboard_tasklet);
}
static const struct input_device_id kbd_ids[] = {
{
.flags = INPUT_DEVICE_ID_MATCH_EVBIT,
.evbit = { BIT_MASK(EV_KEY) },
},
{
.flags = INPUT_DEVICE_ID_MATCH_EVBIT,
.evbit = { BIT_MASK(EV_SND) },
},
{ }, /* Terminating entry */
};
MODULE_DEVICE_TABLE(input, kbd_ids);
static struct input_handler kbd_handler = {
.event = kbd_event,
.match = kbd_match,
.connect = kbd_connect,
.disconnect = kbd_disconnect,
.start = kbd_start,
.name = "kbd",
.id_table = kbd_ids,
};
int __init kbd_init(void)
{
int i;
int error;
for (i = 0; i < MAX_NR_CONSOLES; i++) {
kbd_table[i].ledflagstate = kbd_defleds();
kbd_table[i].default_ledflagstate = kbd_defleds();
kbd_table[i].ledmode = LED_SHOW_FLAGS;
kbd_table[i].lockstate = KBD_DEFLOCK;
kbd_table[i].slockstate = 0;
kbd_table[i].modeflags = KBD_DEFMODE;
kbd_table[i].kbdmode = default_utf8 ? VC_UNICODE : VC_XLATE;
}
kbd_init_leds();
error = input_register_handler(&kbd_handler);
if (error)
return error;
tasklet_enable(&keyboard_tasklet);
tasklet_schedule(&keyboard_tasklet);
return 0;
}
/* Ioctl support code */
/**
* vt_do_diacrit - diacritical table updates
* @cmd: ioctl request
* @udp: pointer to user data for ioctl
* @perm: permissions check computed by caller
*
* Update the diacritical tables atomically and safely. Lock them
* against simultaneous keypresses
*/
int vt_do_diacrit(unsigned int cmd, void __user *udp, int perm)
{
unsigned long flags;
int asize;
int ret = 0;
switch (cmd) {
case KDGKBDIACR:
{
struct kbdiacrs __user *a = udp;
struct kbdiacr *dia;
int i;
dia = kmalloc_array(MAX_DIACR, sizeof(struct kbdiacr),
GFP_KERNEL);
if (!dia)
return -ENOMEM;
/* Lock the diacriticals table, make a copy and then
copy it after we unlock */
spin_lock_irqsave(&kbd_event_lock, flags);
asize = accent_table_size;
for (i = 0; i < asize; i++) {
dia[i].diacr = conv_uni_to_8bit(
accent_table[i].diacr);
dia[i].base = conv_uni_to_8bit(
accent_table[i].base);
dia[i].result = conv_uni_to_8bit(
accent_table[i].result);
}
spin_unlock_irqrestore(&kbd_event_lock, flags);
if (put_user(asize, &a->kb_cnt))
ret = -EFAULT;
else if (copy_to_user(a->kbdiacr, dia,
asize * sizeof(struct kbdiacr)))
ret = -EFAULT;
kfree(dia);
return ret;
}
case KDGKBDIACRUC:
{
struct kbdiacrsuc __user *a = udp;
void *buf;
buf = kmalloc_array(MAX_DIACR, sizeof(struct kbdiacruc),
GFP_KERNEL);
if (buf == NULL)
return -ENOMEM;
/* Lock the diacriticals table, make a copy and then
copy it after we unlock */
spin_lock_irqsave(&kbd_event_lock, flags);
asize = accent_table_size;
memcpy(buf, accent_table, asize * sizeof(struct kbdiacruc));
spin_unlock_irqrestore(&kbd_event_lock, flags);
if (put_user(asize, &a->kb_cnt))
ret = -EFAULT;
else if (copy_to_user(a->kbdiacruc, buf,
asize*sizeof(struct kbdiacruc)))
ret = -EFAULT;
kfree(buf);
return ret;
}
case KDSKBDIACR:
{
struct kbdiacrs __user *a = udp;
struct kbdiacr *dia = NULL;
unsigned int ct;
int i;
if (!perm)
return -EPERM;
if (get_user(ct, &a->kb_cnt))
return -EFAULT;
if (ct >= MAX_DIACR)
return -EINVAL;
if (ct) {
dia = memdup_user(a->kbdiacr,
sizeof(struct kbdiacr) * ct);
if (IS_ERR(dia))
return PTR_ERR(dia);
}
spin_lock_irqsave(&kbd_event_lock, flags);
accent_table_size = ct;
for (i = 0; i < ct; i++) {
accent_table[i].diacr =
conv_8bit_to_uni(dia[i].diacr);
accent_table[i].base =
conv_8bit_to_uni(dia[i].base);
accent_table[i].result =
conv_8bit_to_uni(dia[i].result);
}
spin_unlock_irqrestore(&kbd_event_lock, flags);
kfree(dia);
return 0;
}
case KDSKBDIACRUC:
{
struct kbdiacrsuc __user *a = udp;
unsigned int ct;
void *buf = NULL;
if (!perm)
return -EPERM;
if (get_user(ct, &a->kb_cnt))
return -EFAULT;
if (ct >= MAX_DIACR)
return -EINVAL;
if (ct) {
buf = memdup_user(a->kbdiacruc,
ct * sizeof(struct kbdiacruc));
if (IS_ERR(buf))
return PTR_ERR(buf);
}
spin_lock_irqsave(&kbd_event_lock, flags);
if (ct)
memcpy(accent_table, buf,
ct * sizeof(struct kbdiacruc));
accent_table_size = ct;
spin_unlock_irqrestore(&kbd_event_lock, flags);
kfree(buf);
return 0;
}
}
return ret;
}
/**
* vt_do_kdskbmode - set keyboard mode ioctl
* @console: the console to use
* @arg: the requested mode
*
* Update the keyboard mode bits while holding the correct locks.
* Return 0 for success or an error code.
*/
int vt_do_kdskbmode(unsigned int console, unsigned int arg)
{
struct kbd_struct *kb = &kbd_table[console];
int ret = 0;
unsigned long flags;
spin_lock_irqsave(&kbd_event_lock, flags);
switch(arg) {
case K_RAW:
kb->kbdmode = VC_RAW;
break;
case K_MEDIUMRAW:
kb->kbdmode = VC_MEDIUMRAW;
break;
case K_XLATE:
kb->kbdmode = VC_XLATE;
do_compute_shiftstate();
break;
case K_UNICODE:
kb->kbdmode = VC_UNICODE;
do_compute_shiftstate();
break;
case K_OFF:
kb->kbdmode = VC_OFF;
break;
default:
ret = -EINVAL;
}
spin_unlock_irqrestore(&kbd_event_lock, flags);
return ret;
}
/**
* vt_do_kdskbmeta - set keyboard meta state
* @console: the console to use
* @arg: the requested meta state
*
* Update the keyboard meta bits while holding the correct locks.
* Return 0 for success or an error code.
*/
int vt_do_kdskbmeta(unsigned int console, unsigned int arg)
{
struct kbd_struct *kb = &kbd_table[console];
int ret = 0;
unsigned long flags;
spin_lock_irqsave(&kbd_event_lock, flags);
switch(arg) {
case K_METABIT:
clr_vc_kbd_mode(kb, VC_META);
break;
case K_ESCPREFIX:
set_vc_kbd_mode(kb, VC_META);
break;
default:
ret = -EINVAL;
}
spin_unlock_irqrestore(&kbd_event_lock, flags);
return ret;
}
int vt_do_kbkeycode_ioctl(int cmd, struct kbkeycode __user *user_kbkc,
int perm)
{
struct kbkeycode tmp;
int kc = 0;
if (copy_from_user(&tmp, user_kbkc, sizeof(struct kbkeycode)))
return -EFAULT;
switch (cmd) {
case KDGETKEYCODE:
kc = getkeycode(tmp.scancode);
if (kc >= 0)
kc = put_user(kc, &user_kbkc->keycode);
break;
case KDSETKEYCODE:
if (!perm)
return -EPERM;
kc = setkeycode(tmp.scancode, tmp.keycode);
break;
}
return kc;
}
static unsigned short vt_kdgkbent(unsigned char kbdmode, unsigned char idx,
unsigned char map)
{
unsigned short *key_map, val;
unsigned long flags;
/* Ensure another thread doesn't free it under us */
spin_lock_irqsave(&kbd_event_lock, flags);
key_map = key_maps[map];
if (key_map) {
val = U(key_map[idx]);
if (kbdmode != VC_UNICODE && KTYP(val) >= NR_TYPES)
val = K_HOLE;
} else
val = idx ? K_HOLE : K_NOSUCHMAP;
spin_unlock_irqrestore(&kbd_event_lock, flags);
return val;
}
static int vt_kdskbent(unsigned char kbdmode, unsigned char idx,
unsigned char map, unsigned short val)
{
unsigned long flags;
unsigned short *key_map, *new_map, oldval;
if (!idx && val == K_NOSUCHMAP) {
spin_lock_irqsave(&kbd_event_lock, flags);
/* deallocate map */
key_map = key_maps[map];
if (map && key_map) {
key_maps[map] = NULL;
if (key_map[0] == U(K_ALLOCATED)) {
kfree(key_map);
keymap_count--;
}
}
spin_unlock_irqrestore(&kbd_event_lock, flags);
return 0;
}
if (KTYP(val) < NR_TYPES) {
if (KVAL(val) > max_vals[KTYP(val)])
return -EINVAL;
} else if (kbdmode != VC_UNICODE)
return -EINVAL;
/* ++Geert: non-PC keyboards may generate keycode zero */
#if !defined(__mc68000__) && !defined(__powerpc__)
/* assignment to entry 0 only tests validity of args */
if (!idx)
return 0;
#endif
new_map = kmalloc(sizeof(plain_map), GFP_KERNEL);
if (!new_map)
return -ENOMEM;
spin_lock_irqsave(&kbd_event_lock, flags);
key_map = key_maps[map];
if (key_map == NULL) {
int j;
if (keymap_count >= MAX_NR_OF_USER_KEYMAPS &&
!capable(CAP_SYS_RESOURCE)) {
spin_unlock_irqrestore(&kbd_event_lock, flags);
kfree(new_map);
return -EPERM;
}
key_maps[map] = new_map;
key_map = new_map;
key_map[0] = U(K_ALLOCATED);
for (j = 1; j < NR_KEYS; j++)
key_map[j] = U(K_HOLE);
keymap_count++;
} else
kfree(new_map);
oldval = U(key_map[idx]);
if (val == oldval)
goto out;
/* Attention Key */
if ((oldval == K_SAK || val == K_SAK) && !capable(CAP_SYS_ADMIN)) {
spin_unlock_irqrestore(&kbd_event_lock, flags);
return -EPERM;
}
key_map[idx] = U(val);
if (!map && (KTYP(oldval) == KT_SHIFT || KTYP(val) == KT_SHIFT))
do_compute_shiftstate();
out:
spin_unlock_irqrestore(&kbd_event_lock, flags);
return 0;
}
int vt_do_kdsk_ioctl(int cmd, struct kbentry __user *user_kbe, int perm,
unsigned int console)
{
struct kbd_struct *kb = &kbd_table[console];
struct kbentry kbe;
if (copy_from_user(&kbe, user_kbe, sizeof(struct kbentry)))
return -EFAULT;
switch (cmd) {
case KDGKBENT:
return put_user(vt_kdgkbent(kb->kbdmode, kbe.kb_index,
kbe.kb_table),
&user_kbe->kb_value);
case KDSKBENT:
if (!perm || !capable(CAP_SYS_TTY_CONFIG))
return -EPERM;
return vt_kdskbent(kb->kbdmode, kbe.kb_index, kbe.kb_table,
kbe.kb_value);
}
return 0;
}
static char *vt_kdskbsent(char *kbs, unsigned char cur)
{
static DECLARE_BITMAP(is_kmalloc, MAX_NR_FUNC);
char *cur_f = func_table[cur];
if (cur_f && strlen(cur_f) >= strlen(kbs)) {
strcpy(cur_f, kbs);
return kbs;
}
func_table[cur] = kbs;
return __test_and_set_bit(cur, is_kmalloc) ? cur_f : NULL;
}
int vt_do_kdgkb_ioctl(int cmd, struct kbsentry __user *user_kdgkb, int perm)
{
unsigned char kb_func;
unsigned long flags;
char *kbs;
int ret;
if (get_user(kb_func, &user_kdgkb->kb_func))
return -EFAULT;
kb_func = array_index_nospec(kb_func, MAX_NR_FUNC);
switch (cmd) {
case KDGKBSENT: {
/* size should have been a struct member */
ssize_t len = sizeof(user_kdgkb->kb_string);
kbs = kmalloc(len, GFP_KERNEL);
if (!kbs)
return -ENOMEM;
spin_lock_irqsave(&func_buf_lock, flags);
len = strlcpy(kbs, func_table[kb_func] ? : "", len);
spin_unlock_irqrestore(&func_buf_lock, flags);
ret = copy_to_user(user_kdgkb->kb_string, kbs, len + 1) ?
-EFAULT : 0;
break;
}
case KDSKBSENT:
if (!perm || !capable(CAP_SYS_TTY_CONFIG))
return -EPERM;
kbs = strndup_user(user_kdgkb->kb_string,
sizeof(user_kdgkb->kb_string));
if (IS_ERR(kbs))
return PTR_ERR(kbs);
spin_lock_irqsave(&func_buf_lock, flags);
kbs = vt_kdskbsent(kbs, kb_func);
spin_unlock_irqrestore(&func_buf_lock, flags);
ret = 0;
break;
}
kfree(kbs);
return ret;
}
int vt_do_kdskled(unsigned int console, int cmd, unsigned long arg, int perm)
{
struct kbd_struct *kb = &kbd_table[console];
unsigned long flags;
unsigned char ucval;
switch(cmd) {
/* the ioctls below read/set the flags usually shown in the leds */
/* don't use them - they will go away without warning */
case KDGKBLED:
spin_lock_irqsave(&kbd_event_lock, flags);
ucval = kb->ledflagstate | (kb->default_ledflagstate << 4);
spin_unlock_irqrestore(&kbd_event_lock, flags);
return put_user(ucval, (char __user *)arg);
case KDSKBLED:
if (!perm)
return -EPERM;
if (arg & ~0x77)
return -EINVAL;
spin_lock_irqsave(&led_lock, flags);
kb->ledflagstate = (arg & 7);
kb->default_ledflagstate = ((arg >> 4) & 7);
set_leds();
spin_unlock_irqrestore(&led_lock, flags);
return 0;
/* the ioctls below only set the lights, not the functions */
/* for those, see KDGKBLED and KDSKBLED above */
case KDGETLED:
ucval = getledstate();
return put_user(ucval, (char __user *)arg);
case KDSETLED:
if (!perm)
return -EPERM;
setledstate(kb, arg);
return 0;
}
return -ENOIOCTLCMD;
}
int vt_do_kdgkbmode(unsigned int console)
{
struct kbd_struct *kb = &kbd_table[console];
/* This is a spot read so needs no locking */
switch (kb->kbdmode) {
case VC_RAW:
return K_RAW;
case VC_MEDIUMRAW:
return K_MEDIUMRAW;
case VC_UNICODE:
return K_UNICODE;
case VC_OFF:
return K_OFF;
default:
return K_XLATE;
}
}
/**
* vt_do_kdgkbmeta - report meta status
* @console: console to report
*
* Report the meta flag status of this console
*/
int vt_do_kdgkbmeta(unsigned int console)
{
struct kbd_struct *kb = &kbd_table[console];
/* Again a spot read so no locking */
return vc_kbd_mode(kb, VC_META) ? K_ESCPREFIX : K_METABIT;
}
/**
* vt_reset_unicode - reset the unicode status
* @console: console being reset
*
* Restore the unicode console state to its default
*/
void vt_reset_unicode(unsigned int console)
{
unsigned long flags;
spin_lock_irqsave(&kbd_event_lock, flags);
kbd_table[console].kbdmode = default_utf8 ? VC_UNICODE : VC_XLATE;
spin_unlock_irqrestore(&kbd_event_lock, flags);
}
/**
* vt_get_shift_state - shift bit state
*
* Report the shift bits from the keyboard state. We have to export
* this to support some oddities in the vt layer.
*/
int vt_get_shift_state(void)
{
/* Don't lock as this is a transient report */
return shift_state;
}
/**
* vt_reset_keyboard - reset keyboard state
* @console: console to reset
*
* Reset the keyboard bits for a console as part of a general console
* reset event
*/
void vt_reset_keyboard(unsigned int console)
{
struct kbd_struct *kb = &kbd_table[console];
unsigned long flags;
spin_lock_irqsave(&kbd_event_lock, flags);
set_vc_kbd_mode(kb, VC_REPEAT);
clr_vc_kbd_mode(kb, VC_CKMODE);
clr_vc_kbd_mode(kb, VC_APPLIC);
clr_vc_kbd_mode(kb, VC_CRLF);
kb->lockstate = 0;
kb->slockstate = 0;
spin_lock(&led_lock);
kb->ledmode = LED_SHOW_FLAGS;
kb->ledflagstate = kb->default_ledflagstate;
spin_unlock(&led_lock);
/* do not do set_leds here because this causes an endless tasklet loop
when the keyboard hasn't been initialized yet */
spin_unlock_irqrestore(&kbd_event_lock, flags);
}
/**
* vt_get_kbd_mode_bit - read keyboard status bits
* @console: console to read from
* @bit: mode bit to read
*
* Report back a vt mode bit. We do this without locking so the
* caller must be sure that there are no synchronization needs
*/
int vt_get_kbd_mode_bit(unsigned int console, int bit)
{
struct kbd_struct *kb = &kbd_table[console];
return vc_kbd_mode(kb, bit);
}
/**
* vt_set_kbd_mode_bit - read keyboard status bits
* @console: console to read from
* @bit: mode bit to read
*
* Set a vt mode bit. We do this without locking so the
* caller must be sure that there are no synchronization needs
*/
void vt_set_kbd_mode_bit(unsigned int console, int bit)
{
struct kbd_struct *kb = &kbd_table[console];
unsigned long flags;
spin_lock_irqsave(&kbd_event_lock, flags);
set_vc_kbd_mode(kb, bit);
spin_unlock_irqrestore(&kbd_event_lock, flags);
}
/**
* vt_clr_kbd_mode_bit - read keyboard status bits
* @console: console to read from
* @bit: mode bit to read
*
* Report back a vt mode bit. We do this without locking so the
* caller must be sure that there are no synchronization needs
*/
void vt_clr_kbd_mode_bit(unsigned int console, int bit)
{
struct kbd_struct *kb = &kbd_table[console];
unsigned long flags;
spin_lock_irqsave(&kbd_event_lock, flags);
clr_vc_kbd_mode(kb, bit);
spin_unlock_irqrestore(&kbd_event_lock, flags);
}