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keyboard.c
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keyboard.c
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/*
* linux/drivers/char/keyboard.c
*
* 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, [email protected], 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, [email protected].
* 21-08-02: Converted to input API, major cleanup. (Vojtech Pavlik)
*/
#include <linux/consolemap.h>
#include <linux/module.h>
#include <linux/sched.h>
#include <linux/tty.h>
#include <linux/tty_flip.h>
#include <linux/mm.h>
#include <linux/string.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/irq.h>
#include <linux/kbd_kern.h>
#include <linux/kbd_diacr.h>
#include <linux/vt_kern.h>
#include <linux/sysrq.h>
#include <linux/input.h>
#include <linux/reboot.h>
#include <linux/notifier.h>
#include <linux/jiffies.h>
extern void ctrl_alt_del(void);
/*
* Exported functions/variables
*/
#define KBD_DEFMODE ((1 << VC_REPEAT) | (1 << VC_META))
/*
* Some laptops take the 789uiojklm,. keys as number pad when NumLock is on.
* This seems a good reason to start with NumLock off. On HIL keyboards
* of PARISC machines however there is no NumLock key and everyone expects the keypad
* to be used for numbers.
*/
#if defined(CONFIG_PARISC) && (defined(CONFIG_KEYBOARD_HIL) || defined(CONFIG_KEYBOARD_HIL_OLD))
#define KBD_DEFLEDS (1 << VC_NUMLOCK)
#else
#define KBD_DEFLEDS 0
#endif
#define KBD_DEFLOCK 0
void compute_shiftstate(void);
/*
* 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;
k_handler_fn *k_handler[16] = { K_HANDLERS };
EXPORT_SYMBOL_GPL(k_handler);
#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
*/
/* maximum values each key_handler can handle */
const int max_vals[] = {
255, ARRAY_SIZE(func_table) - 1, ARRAY_SIZE(fn_handler) - 1, NR_PAD - 1,
NR_DEAD - 1, 255, 3, NR_SHIFT - 1, 255, NR_ASCII - 1, NR_LOCK - 1,
255, NR_LOCK - 1, 255, NR_BRL - 1
};
const int NR_TYPES = ARRAY_SIZE(max_vals);
struct kbd_struct kbd_table[MAX_NR_CONSOLES];
EXPORT_SYMBOL_GPL(kbd_table);
static struct kbd_struct *kbd = kbd_table;
struct vt_spawn_console vt_spawn_con = {
.lock = __SPIN_LOCK_UNLOCKED(vt_spawn_con.lock),
.pid = NULL,
.sig = 0,
};
/*
* Variables exported for vt.c
*/
int shift_state = 0;
/*
* Internal Data.
*/
static struct input_handler kbd_handler;
static DEFINE_SPINLOCK(kbd_event_lock);
static unsigned long key_down[BITS_TO_LONGS(KEY_CNT)]; /* keyboard key bitmap */
static unsigned char shift_down[NR_SHIFT]; /* shift state counters.. */
static int dead_key_next;
static int npadch = -1; /* -1 or number assembled on pad */
static unsigned int diacr;
static char rep; /* flag telling character repeat */
static unsigned char ledstate = 0xff; /* undefined */
static unsigned char ledioctl;
static struct ledptr {
unsigned int *addr;
unsigned int mask;
unsigned char valid:1;
} ledptrs[3];
/* Simple translation table for the SysRq keys */
#ifdef CONFIG_MAGIC_SYSRQ
unsigned char kbd_sysrq_xlate[KEY_MAX + 1] =
"\000\0331234567890-=\177\t" /* 0x00 - 0x0f */
"qwertyuiop[]\r\000as" /* 0x10 - 0x1f */
"dfghjkl;'`\000\\zxcv" /* 0x20 - 0x2f */
"bnm,./\000*\000 \000\201\202\203\204\205" /* 0x30 - 0x3f */
"\206\207\210\211\212\000\000789-456+1" /* 0x40 - 0x4f */
"230\177\000\000\213\214\000\000\000\000\000\000\000\000\000\000" /* 0x50 - 0x5f */
"\r\000/"; /* 0x60 - 0x6f */
static int sysrq_down;
static int sysrq_alt_use;
#endif
static int sysrq_alt;
/*
* 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 {
unsigned int scancode;
unsigned int keycode;
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->scancode, &d->keycode);
return d->error == 0; /* stop as soon as we successfully get one */
}
int getkeycode(unsigned int scancode)
{
struct getset_keycode_data d = { scancode, 0, -ENODEV };
input_handler_for_each_handle(&kbd_handler, &d, getkeycode_helper);
return d.error ?: d.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->scancode, d->keycode);
return d->error == 0; /* stop as soon as we successfully set one */
}
int setkeycode(unsigned int scancode, unsigned int keycode)
{
struct getset_keycode_data d = { scancode, keycode, -ENODEV };
input_handler_for_each_handle(&kbd_handler, &d, setkeycode_helper);
return d.error;
}
/*
* Making beeps and bells.
*/
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 (test_bit(SND_BELL, handle->dev->sndbit))
input_inject_event(handle, EV_SND, SND_BELL, *hz ? 1 : 0);
}
return 0;
}
static void kd_nosound(unsigned long ignored)
{
static unsigned int zero;
input_handler_for_each_handle(&kbd_handler, &zero, kd_sound_helper);
}
static DEFINE_TIMER(kd_mksound_timer, kd_nosound, 0, 0);
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 *rep = data;
if (test_bit(EV_REP, dev->evbit)) {
if (rep[0].delay > 0)
input_inject_event(handle,
EV_REP, REP_DELAY, rep[0].delay);
if (rep[0].period > 0)
input_inject_event(handle,
EV_REP, REP_PERIOD, rep[0].period);
rep[1].delay = dev->rep[REP_DELAY];
rep[1].period = dev->rep[REP_PERIOD];
}
return 0;
}
int kbd_rate(struct kbd_repeat *rep)
{
struct kbd_repeat data[2] = { *rep };
input_handler_for_each_handle(&kbd_handler, data, kbd_rate_helper);
*rep = data[1]; /* Copy currently used settings */
return 0;
}
/*
* Helper Functions.
*/
static void put_queue(struct vc_data *vc, int ch)
{
struct tty_struct *tty = vc->vc_tty;
if (tty) {
tty_insert_flip_char(tty, ch, 0);
con_schedule_flip(tty);
}
}
static void puts_queue(struct vc_data *vc, char *cp)
{
struct tty_struct *tty = vc->vc_tty;
if (!tty)
return;
while (*cp) {
tty_insert_flip_char(tty, *cp, 0);
cp++;
}
con_schedule_flip(tty);
}
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));
}
}
/*
* 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
*/
void compute_shiftstate(void)
{
unsigned int i, j, k, sym, val;
shift_state = 0;
memset(shift_down, 0, sizeof(shift_down));
for (i = 0; i < ARRAY_SIZE(key_down); i++) {
if (!key_down[i])
continue;
k = i * BITS_PER_LONG;
for (j = 0; j < BITS_PER_LONG; j++, k++) {
if (!test_bit(k, key_down))
continue;
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 |= (1 << val);
}
}
}
/*
* 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, 13);
if (vc_kbd_mode(kbd, VC_CRLF))
put_queue(vc, 10);
}
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->vc_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->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)
{
struct tty_struct *tty = vc->vc_tty;
if (!tty)
return;
tty_insert_flip_char(tty, 0, TTY_BREAK);
con_schedule_flip(tty);
}
static void fn_scroll_forw(struct vc_data *vc)
{
scrollfront(vc, 0);
}
static void fn_scroll_back(struct vc_data *vc)
{
scrollback(vc, 0);
}
static void fn_show_mem(struct vc_data *vc)
{
show_mem();
}
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 = 1;
}
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)
{
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) &&
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)
{
printk(KERN_ERR "keyboard.c: 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 = 0;
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] = {'`', '\'', '^', '~', '"', ',' };
value = ret_diacr[value];
k_deadunicode(vc, 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)
{
unsigned v;
if (up_flag)
return;
v = value;
if (v < ARRAY_SIZE(func_table)) {
if (func_table[value])
puts_queue(vc, func_table[value]);
} else
printk(KERN_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, 10);
}
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 |= (1 << value);
else
shift_state &= ~(1 << value);
/* kludge */
if (up_flag && shift_state != old_state && npadch != -1) {
if (kbd->kbdmode == VC_UNICODE)
to_utf8(vc, npadch);
else
put_queue(vc, npadch & 0xff);
npadch = -1;
}
}
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 | 0x80);
}
static void k_ascii(struct vc_data *vc, unsigned char value, char up_flag)
{
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 == -1)
npadch = value;
else
npadch = npadch * 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)
printk("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) {
if (brl_timeout) {
if (!committing ||
time_after(jiffies,
releasestart + msecs_to_jiffies(brl_timeout))) {
committing = pressed;
releasestart = jiffies;
}
pressed &= ~(1 << (value - 1));
if (!pressed) {
if (committing) {
k_brlcommit(vc, committing, 0);
committing = 0;
}
}
} else {
if (committing) {
k_brlcommit(vc, committing, 0);
committing = 0;
}
pressed &= ~(1 << (value - 1));
}
} else {
pressed |= 1 << (value - 1);
if (!brl_timeout)
committing = pressed;
}
}
/*
* 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.
*/
unsigned char getledstate(void)
{
return ledstate;
}
void setledstate(struct kbd_struct *kbd, unsigned int led)
{
if (!(led & ~7)) {
ledioctl = led;
kbd->ledmode = LED_SHOW_IOCTL;
} else
kbd->ledmode = LED_SHOW_FLAGS;
set_leds();
}
static inline unsigned char getleds(void)
{
struct kbd_struct *kbd = kbd_table + fg_console;
unsigned char leds;
int i;
if (kbd->ledmode == LED_SHOW_IOCTL)
return ledioctl;
leds = kbd->ledflagstate;