keyboard.c

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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)
{
	unsigned int uni;
	if (kbd->kbdmode == VC_UNICODE)
		uni = value;
	else
		uni = conv_8bit_to_uni(value);
	k_unicode(vc, uni, 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 ||
			    jiffies - releasestart > (brl_timeout * HZ) / 1000) {
				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)