mirror/freebsd
1
0
Fork 0
mirror of https://git.FreeBSD.org/src.git synced 2024-12-25 11:37:56 +00:00
Code Issues Releases Activity
999da77859
freebsd/sys/dev/kbdmux/kbdmux.c
Maksim Yevmenkin ed382753a7 Undo SVN rev 183283 
Do not use Giant for kbdmux(4) locking. This is wrong and apparently
causing more problems than it solves. This will re-open the issue
where interrupt handlers may race with kbdmux(4) in polling mode.
Typical symptoms include (but not limited to) duplicated and/or
missing characters when low level console functions (such as gets)
are used while interrupts are enabled (for example geli password
prompt, mountroot prompt etc.)

MFC after:	3 days
2009-04-08 20:52:30 +00:00

1370 lines
31 KiB
C
Raw Blame History

/*
* kbdmux.c
*/
/*-
* Copyright (c) 2005 Maksim Yevmenkin <m_evmenkin@yahoo.com>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $Id: kbdmux.c,v 1.4 2005/07/14 17:38:35 max Exp $
* $FreeBSD$
*/
#include "opt_compat.h"
#include "opt_kbd.h"
#include <sys/param.h>
#include <sys/bus.h>
#include <sys/clist.h>
#include <sys/conf.h>
#include <sys/consio.h>
#include <sys/fcntl.h>
#include <sys/kbio.h>
#include <sys/kernel.h>
#include <sys/limits.h>
#include <sys/lock.h>
#include <sys/malloc.h>
#include <sys/module.h>
#include <sys/mutex.h>
#include <sys/poll.h>
#include <sys/proc.h>
#include <sys/queue.h>
#include <sys/selinfo.h>
#include <sys/systm.h>
#include <sys/taskqueue.h>
#include <sys/uio.h>
#include <dev/kbd/kbdreg.h>
#include <dev/kbd/kbdtables.h>
#define KEYBOARD_NAME "kbdmux"
MALLOC_DECLARE(M_KBDMUX);
MALLOC_DEFINE(M_KBDMUX, KEYBOARD_NAME, "Keyboard multiplexor");
/*****************************************************************************
*****************************************************************************
** Keyboard state
*****************************************************************************
*****************************************************************************/
#define KBDMUX_Q_SIZE 512 /* input queue size */
/*
* XXX
* For now rely on Giant mutex to protect our data structures.
* Just like the rest of keyboard drivers and syscons(4) do.
* Note that callout is initialized as not MP-safe to make sure
* Giant is held.
*/
#if 0 /* not yet */
#define KBDMUX_LOCK_DECL_GLOBAL \
struct mtx ks_lock
#define KBDMUX_LOCK_INIT(s) \
mtx_init(&(s)->ks_lock, "kbdmux", NULL, MTX_DEF|MTX_RECURSE)
#define KBDMUX_LOCK_DESTROY(s) \
mtx_destroy(&(s)->ks_lock)
#define KBDMUX_LOCK(s) \
mtx_lock(&(s)->ks_lock)
#define KBDMUX_UNLOCK(s) \
mtx_unlock(&(s)->ks_lock)
#define KBDMUX_LOCK_ASSERT(s, w) \
mtx_assert(&(s)->ks_lock, (w))
#define KBDMUX_SLEEP(s, f, d, t) \
msleep(&(s)->f, &(s)->ks_lock, PCATCH | (PZERO + 1), (d), (t))
#define KBDMUX_CALLOUT_INIT(s) \
callout_init_mtx(&(s)->ks_timo, &(s)->ks_lock, 0)
#define KBDMUX_QUEUE_INTR(s) \
taskqueue_enqueue(taskqueue_swi_giant, &(s)->ks_task)
#else
#define KBDMUX_LOCK_DECL_GLOBAL
#define KBDMUX_LOCK_INIT(s)
#define KBDMUX_LOCK_DESTROY(s)
#define KBDMUX_LOCK(s)
#define KBDMUX_UNLOCK(s)
#define KBDMUX_LOCK_ASSERT(s, w)
#define KBDMUX_SLEEP(s, f, d, t) \
tsleep(&(s)->f, PCATCH | (PZERO + 1), (d), (t))
#define KBDMUX_CALLOUT_INIT(s) \
callout_init(&(s)->ks_timo, 0)
#define KBDMUX_QUEUE_INTR(s) \
taskqueue_enqueue(taskqueue_swi_giant, &(s)->ks_task)
#endif /* not yet */
/*
* kbdmux keyboard
*/
struct kbdmux_kbd
{
keyboard_t *kbd; /* keyboard */
SLIST_ENTRY(kbdmux_kbd) next; /* link to next */
};
typedef struct kbdmux_kbd kbdmux_kbd_t;
/*
* kbdmux state
*/
struct kbdmux_state
{
struct clist ks_inq; /* input chars queue */
struct task ks_task; /* interrupt task */
struct callout ks_timo; /* timeout handler */
#define TICKS (hz) /* rate */
int ks_flags; /* flags */
#define COMPOSE (1 << 0) /* compose char flag */
#define POLLING (1 << 1) /* polling */
#define TASK (1 << 2) /* interrupt task queued */
int ks_mode; /* K_XLATE, K_RAW, K_CODE */
int ks_state; /* state */
int ks_accents; /* accent key index (> 0) */
u_int ks_composed_char; /* composed char code */
u_char ks_prefix; /* AT scan code prefix */
SLIST_HEAD(, kbdmux_kbd) ks_kbds; /* keyboards */
KBDMUX_LOCK_DECL_GLOBAL;
};
typedef struct kbdmux_state kbdmux_state_t;
/*****************************************************************************
*****************************************************************************
** Helper functions
*****************************************************************************
*****************************************************************************/
static task_fn_t kbdmux_kbd_intr;
static timeout_t kbdmux_kbd_intr_timo;
static kbd_callback_func_t kbdmux_kbd_event;
/*
* Interrupt handler task
*/
void
kbdmux_kbd_intr(void *xkbd, int pending)
{
keyboard_t *kbd = (keyboard_t *) xkbd;
kbdmux_state_t *state = (kbdmux_state_t *) kbd->kb_data;
kbdd_intr(kbd, NULL);
KBDMUX_LOCK(state);
state->ks_flags &= ~TASK;
wakeup(&state->ks_task);
KBDMUX_UNLOCK(state);
}
/*
* Schedule interrupt handler on timeout. Called with locked state.
*/
void
kbdmux_kbd_intr_timo(void *xstate)
{
kbdmux_state_t *state = (kbdmux_state_t *) xstate;
KBDMUX_LOCK_ASSERT(state, MA_OWNED);
if (callout_pending(&state->ks_timo))
return; /* callout was reset */
if (!callout_active(&state->ks_timo))
return; /* callout was stopped */
callout_deactivate(&state->ks_timo);
/* queue interrupt task if needed */
if (state->ks_inq.c_cc > 0 && !(state->ks_flags & TASK) &&
KBDMUX_QUEUE_INTR(state) == 0)
state->ks_flags |= TASK;
/* re-schedule timeout */
callout_reset(&state->ks_timo, TICKS, kbdmux_kbd_intr_timo, state);
}
/*
* Process event from one of our keyboards
*/
static int
kbdmux_kbd_event(keyboard_t *kbd, int event, void *arg)
{
kbdmux_state_t *state = (kbdmux_state_t *) arg;
switch (event) {
case KBDIO_KEYINPUT: {
int c;
KBDMUX_LOCK(state);
/*
* Read all chars from the keyboard
*
* Turns out that atkbd(4) check_char() method may return
* "true" while read_char() method returns NOKEY. If this
* happens we could stuck in the loop below. Avoid this
* by breaking out of the loop if read_char() method returns
* NOKEY.
*/
while (kbdd_check_char(kbd)) {
c = kbdd_read_char(kbd, 0);
if (c == NOKEY)
break;
if (c == ERRKEY)
continue; /* XXX ring bell */
if (!KBD_IS_BUSY(kbd))
continue; /* not open - discard the input */
putc(c, &state->ks_inq);
}
/* queue interrupt task if needed */
if (state->ks_inq.c_cc > 0 && !(state->ks_flags & TASK) &&
KBDMUX_QUEUE_INTR(state) == 0)
state->ks_flags |= TASK;
KBDMUX_UNLOCK(state);
} break;
case KBDIO_UNLOADING: {
kbdmux_kbd_t *k;
KBDMUX_LOCK(state);
SLIST_FOREACH(k, &state->ks_kbds, next)
if (k->kbd == kbd)
break;
if (k != NULL) {
kbd_release(k->kbd, &k->kbd);
SLIST_REMOVE(&state->ks_kbds, k, kbdmux_kbd, next);
k->kbd = NULL;
free(k, M_KBDMUX);
}
KBDMUX_UNLOCK(state);
} break;
default:
return (EINVAL);
/* NOT REACHED */
}
return (0);
}
/****************************************************************************
****************************************************************************
** Keyboard driver
****************************************************************************
****************************************************************************/
static int kbdmux_configure(int flags);
static kbd_probe_t kbdmux_probe;
static kbd_init_t kbdmux_init;
static kbd_term_t kbdmux_term;
static kbd_intr_t kbdmux_intr;
static kbd_test_if_t kbdmux_test_if;
static kbd_enable_t kbdmux_enable;
static kbd_disable_t kbdmux_disable;
static kbd_read_t kbdmux_read;
static kbd_check_t kbdmux_check;
static kbd_read_char_t kbdmux_read_char;
static kbd_check_char_t kbdmux_check_char;
static kbd_ioctl_t kbdmux_ioctl;
static kbd_lock_t kbdmux_lock;
static void kbdmux_clear_state_locked(kbdmux_state_t *state);
static kbd_clear_state_t kbdmux_clear_state;
static kbd_get_state_t kbdmux_get_state;
static kbd_set_state_t kbdmux_set_state;
static kbd_poll_mode_t kbdmux_poll;
static keyboard_switch_t kbdmuxsw = {
.probe = kbdmux_probe,
.init = kbdmux_init,
.term = kbdmux_term,
.intr = kbdmux_intr,
.test_if = kbdmux_test_if,
.enable = kbdmux_enable,
.disable = kbdmux_disable,
.read = kbdmux_read,
.check = kbdmux_check,
.read_char = kbdmux_read_char,
.check_char = kbdmux_check_char,
.ioctl = kbdmux_ioctl,
.lock = kbdmux_lock,
.clear_state = kbdmux_clear_state,
.get_state = kbdmux_get_state,
.set_state = kbdmux_set_state,
.get_fkeystr = genkbd_get_fkeystr,
.poll = kbdmux_poll,
.diag = genkbd_diag,
};
/*
* Return the number of found keyboards
*/
static int
kbdmux_configure(int flags)
{
return (1);
}
/*
* Detect a keyboard
*/
static int
kbdmux_probe(int unit, void *arg, int flags)
{
if (resource_disabled(KEYBOARD_NAME, unit))
return (ENXIO);
return (0);
}
/*
* Reset and initialize the keyboard (stolen from atkbd.c)
*/
static int
kbdmux_init(int unit, keyboard_t **kbdp, void *arg, int flags)
{
keyboard_t *kbd = NULL;
kbdmux_state_t *state = NULL;
keymap_t *keymap = NULL;
accentmap_t *accmap = NULL;
fkeytab_t *fkeymap = NULL;
int error, needfree, fkeymap_size, delay[2];
if (*kbdp == NULL) {
*kbdp = kbd = malloc(sizeof(*kbd), M_KBDMUX, M_NOWAIT | M_ZERO);
state = malloc(sizeof(*state), M_KBDMUX, M_NOWAIT | M_ZERO);
keymap = malloc(sizeof(key_map), M_KBDMUX, M_NOWAIT);
accmap = malloc(sizeof(accent_map), M_KBDMUX, M_NOWAIT);
fkeymap = malloc(sizeof(fkey_tab), M_KBDMUX, M_NOWAIT);
fkeymap_size = sizeof(fkey_tab)/sizeof(fkey_tab[0]);
needfree = 1;
if ((kbd == NULL) || (state == NULL) || (keymap == NULL) ||
(accmap == NULL) || (fkeymap == NULL)) {
error = ENOMEM;
goto bad;
}
KBDMUX_LOCK_INIT(state);
clist_alloc_cblocks(&state->ks_inq,
KBDMUX_Q_SIZE, KBDMUX_Q_SIZE / 2);
TASK_INIT(&state->ks_task, 0, kbdmux_kbd_intr, (void *) kbd);
KBDMUX_CALLOUT_INIT(state);
SLIST_INIT(&state->ks_kbds);
} else if (KBD_IS_INITIALIZED(*kbdp) && KBD_IS_CONFIGURED(*kbdp)) {
return (0);
} else {
kbd = *kbdp;
state = (kbdmux_state_t *) kbd->kb_data;
keymap = kbd->kb_keymap;
accmap = kbd->kb_accentmap;
fkeymap = kbd->kb_fkeytab;
fkeymap_size = kbd->kb_fkeytab_size;
needfree = 0;
}
if (!KBD_IS_PROBED(kbd)) {
/* XXX assume 101/102 keys keyboard */
kbd_init_struct(kbd, KEYBOARD_NAME, KB_101, unit, flags, 0, 0);
bcopy(&key_map, keymap, sizeof(key_map));
bcopy(&accent_map, accmap, sizeof(accent_map));
bcopy(fkey_tab, fkeymap,
imin(fkeymap_size*sizeof(fkeymap[0]), sizeof(fkey_tab)));
kbd_set_maps(kbd, keymap, accmap, fkeymap, fkeymap_size);
kbd->kb_data = (void *)state;
KBD_FOUND_DEVICE(kbd);
KBD_PROBE_DONE(kbd);
KBDMUX_LOCK(state);
kbdmux_clear_state_locked(state);
state->ks_mode = K_XLATE;
KBDMUX_UNLOCK(state);
}
if (!KBD_IS_INITIALIZED(kbd) && !(flags & KB_CONF_PROBE_ONLY)) {
kbd->kb_config = flags & ~KB_CONF_PROBE_ONLY;
kbdmux_ioctl(kbd, KDSETLED, (caddr_t)&state->ks_state);
delay[0] = kbd->kb_delay1;
delay[1] = kbd->kb_delay2;
kbdmux_ioctl(kbd, KDSETREPEAT, (caddr_t)delay);
KBD_INIT_DONE(kbd);
}
if (!KBD_IS_CONFIGURED(kbd)) {
if (kbd_register(kbd) < 0) {
error = ENXIO;
goto bad;
}
KBD_CONFIG_DONE(kbd);
KBDMUX_LOCK(state);
callout_reset(&state->ks_timo, TICKS, kbdmux_kbd_intr_timo, state);
KBDMUX_UNLOCK(state);
}
return (0);
bad:
if (needfree) {
if (state != NULL) {
clist_free_cblocks(&state->ks_inq);
free(state, M_KBDMUX);
}
if (keymap != NULL)
free(keymap, M_KBDMUX);
if (accmap != NULL)
free(accmap, M_KBDMUX);
if (fkeymap != NULL)
free(fkeymap, M_KBDMUX);
if (kbd != NULL) {
free(kbd, M_KBDMUX);
*kbdp = NULL; /* insure ref doesn't leak to caller */
}
}
return (error);
}
/*
* Finish using this keyboard
*/
static int
kbdmux_term(keyboard_t *kbd)
{
kbdmux_state_t *state = (kbdmux_state_t *) kbd->kb_data;
kbdmux_kbd_t *k;
KBDMUX_LOCK(state);
/* kill callout */
callout_stop(&state->ks_timo);
/* wait for interrupt task */
while (state->ks_flags & TASK)
KBDMUX_SLEEP(state, ks_task, "kbdmuxc", 0);
/* release all keyboards from the mux */
while ((k = SLIST_FIRST(&state->ks_kbds)) != NULL) {
kbd_release(k->kbd, &k->kbd);
SLIST_REMOVE_HEAD(&state->ks_kbds, next);
k->kbd = NULL;
free(k, M_KBDMUX);
}
/* flush input queue */
ndflush(&state->ks_inq, state->ks_inq.c_cc);
clist_free_cblocks(&state->ks_inq);
KBDMUX_UNLOCK(state);
kbd_unregister(kbd);
KBDMUX_LOCK_DESTROY(state);
bzero(state, sizeof(*state));
free(state, M_KBDMUX);
free(kbd->kb_keymap, M_KBDMUX);
free(kbd->kb_accentmap, M_KBDMUX);
free(kbd->kb_fkeytab, M_KBDMUX);
free(kbd, M_KBDMUX);
return (0);
}
/*
* Keyboard interrupt routine
*/
static int
kbdmux_intr(keyboard_t *kbd, void *arg)
{
int c;
if (KBD_IS_ACTIVE(kbd) && KBD_IS_BUSY(kbd)) {
/* let the callback function to process the input */
(*kbd->kb_callback.kc_func)(kbd, KBDIO_KEYINPUT,
kbd->kb_callback.kc_arg);
} else {
/* read and discard the input; no one is waiting for input */
do {
c = kbdmux_read_char(kbd, FALSE);
} while (c != NOKEY);
}
return (0);
}
/*
* Test the interface to the device
*/
static int
kbdmux_test_if(keyboard_t *kbd)
{
return (0);
}
/*
* Enable the access to the device; until this function is called,
* the client cannot read from the keyboard.
*/
static int
kbdmux_enable(keyboard_t *kbd)
{
KBD_ACTIVATE(kbd);
return (0);
}
/*
* Disallow the access to the device
*/
static int
kbdmux_disable(keyboard_t *kbd)
{
KBD_DEACTIVATE(kbd);
return (0);
}
/*
* Read one byte from the keyboard if it's allowed
*/
static int
kbdmux_read(keyboard_t *kbd, int wait)
{
kbdmux_state_t *state = (kbdmux_state_t *) kbd->kb_data;
int c;
KBDMUX_LOCK(state);
c = getc(&state->ks_inq);
KBDMUX_UNLOCK(state);
if (c != -1)
kbd->kb_count ++;
return (KBD_IS_ACTIVE(kbd)? c : -1);
}
/*
* Check if data is waiting
*/
static int
kbdmux_check(keyboard_t *kbd)
{
kbdmux_state_t *state = (kbdmux_state_t *) kbd->kb_data;
int ready;
if (!KBD_IS_ACTIVE(kbd))
return (FALSE);
KBDMUX_LOCK(state);
ready = (state->ks_inq.c_cc > 0)? TRUE : FALSE;
KBDMUX_UNLOCK(state);
return (ready);
}
/*
* Read char from the keyboard (stolen from atkbd.c)
*/
static u_int
kbdmux_read_char(keyboard_t *kbd, int wait)
{
kbdmux_state_t *state = (kbdmux_state_t *) kbd->kb_data;
u_int action;
int scancode, keycode;
KBDMUX_LOCK(state);
next_code:
/* do we have a composed char to return? */
if (!(state->ks_flags & COMPOSE) && (state->ks_composed_char > 0)) {
action = state->ks_composed_char;
state->ks_composed_char = 0;
if (action > UCHAR_MAX) {
KBDMUX_UNLOCK(state);
return (ERRKEY);
}
KBDMUX_UNLOCK(state);
return (action);
}
/* see if there is something in the keyboard queue */
scancode = getc(&state->ks_inq);
if (scancode == -1) {
if (state->ks_flags & POLLING) {
kbdmux_kbd_t *k;
SLIST_FOREACH(k, &state->ks_kbds, next) {
while (kbdd_check_char(k->kbd)) {
scancode = kbdd_read_char(k->kbd, 0);
if (scancode == NOKEY)
break;
if (scancode == ERRKEY)
continue;
if (!KBD_IS_BUSY(k->kbd))
continue;
putc(scancode, &state->ks_inq);
}
}
if (state->ks_inq.c_cc > 0)
goto next_code;
}
KBDMUX_UNLOCK(state);
return (NOKEY);
}
/* XXX FIXME: check for -1 if wait == 1! */
kbd->kb_count ++;
/* return the byte as is for the K_RAW mode */
if (state->ks_mode == K_RAW) {
KBDMUX_UNLOCK(state);
return (scancode);
}
/* translate the scan code into a keycode */
keycode = scancode & 0x7F;
switch (state->ks_prefix) {
case 0x00: /* normal scancode */
switch(scancode) {
case 0xB8: /* left alt (compose key) released */
if (state->ks_flags & COMPOSE) {
state->ks_flags &= ~COMPOSE;
if (state->ks_composed_char > UCHAR_MAX)
state->ks_composed_char = 0;
}
break;
case 0x38: /* left alt (compose key) pressed */
if (!(state->ks_flags & COMPOSE)) {
state->ks_flags |= COMPOSE;
state->ks_composed_char = 0;
}
break;
case 0xE0:
case 0xE1:
state->ks_prefix = scancode;
goto next_code;
}
break;
case 0xE0: /* 0xE0 prefix */
state->ks_prefix = 0;
switch (keycode) {
case 0x1C: /* right enter key */
keycode = 0x59;
break;
case 0x1D: /* right ctrl key */
keycode = 0x5A;
break;
case 0x35: /* keypad divide key */
keycode = 0x5B;
break;
case 0x37: /* print scrn key */
keycode = 0x5C;
break;
case 0x38: /* right alt key (alt gr) */
keycode = 0x5D;
break;
case 0x46: /* ctrl-pause/break on AT 101 (see below) */
keycode = 0x68;
break;
case 0x47: /* grey home key */
keycode = 0x5E;
break;
case 0x48: /* grey up arrow key */
keycode = 0x5F;
break;
case 0x49: /* grey page up key */
keycode = 0x60;
break;
case 0x4B: /* grey left arrow key */
keycode = 0x61;
break;
case 0x4D: /* grey right arrow key */
keycode = 0x62;
break;
case 0x4F: /* grey end key */
keycode = 0x63;
break;
case 0x50: /* grey down arrow key */
keycode = 0x64;
break;
case 0x51: /* grey page down key */
keycode = 0x65;
break;
case 0x52: /* grey insert key */
keycode = 0x66;
break;
case 0x53: /* grey delete key */
keycode = 0x67;
break;
/* the following 3 are only used on the MS "Natural" keyboard */
case 0x5b: /* left Window key */
keycode = 0x69;
break;
case 0x5c: /* right Window key */
keycode = 0x6a;
break;
case 0x5d: /* menu key */
keycode = 0x6b;
break;
case 0x5e: /* power key */
keycode = 0x6d;
break;
case 0x5f: /* sleep key */
keycode = 0x6e;
break;
case 0x63: /* wake key */
keycode = 0x6f;
break;
case 0x64: /* [JP106USB] backslash, underscore */
keycode = 0x73;
break;
default: /* ignore everything else */
goto next_code;
}
break;
case 0xE1: /* 0xE1 prefix */
/*
* The pause/break key on the 101 keyboard produces:
* E1-1D-45 E1-9D-C5
* Ctrl-pause/break produces:
* E0-46 E0-C6 (See above.)
*/
state->ks_prefix = 0;
if (keycode == 0x1D)
state->ks_prefix = 0x1D;
goto next_code;
/* NOT REACHED */
case 0x1D: /* pause / break */
state->ks_prefix = 0;
if (keycode != 0x45)
goto next_code;
keycode = 0x68;
break;
}
/* XXX assume 101/102 keys AT keyboard */
switch (keycode) {
case 0x5c: /* print screen */
if (state->ks_flags & ALTS)
keycode = 0x54; /* sysrq */
break;
case 0x68: /* pause/break */
if (state->ks_flags & CTLS)
keycode = 0x6c; /* break */
break;
}
/* return the key code in the K_CODE mode */
if (state->ks_mode == K_CODE) {
KBDMUX_UNLOCK(state);
return (keycode | (scancode & 0x80));
}
/* compose a character code */
if (state->ks_flags & COMPOSE) {
switch (keycode | (scancode & 0x80)) {
/* key pressed, process it */
case 0x47: case 0x48: case 0x49: /* keypad 7,8,9 */
state->ks_composed_char *= 10;
state->ks_composed_char += keycode - 0x40;
if (state->ks_composed_char > UCHAR_MAX) {
KBDMUX_UNLOCK(state);
return (ERRKEY);
}
goto next_code;
case 0x4B: case 0x4C: case 0x4D: /* keypad 4,5,6 */
state->ks_composed_char *= 10;
state->ks_composed_char += keycode - 0x47;
if (state->ks_composed_char > UCHAR_MAX) {
KBDMUX_UNLOCK(state);
return (ERRKEY);
}
goto next_code;
case 0x4F: case 0x50: case 0x51: /* keypad 1,2,3 */
state->ks_composed_char *= 10;
state->ks_composed_char += keycode - 0x4E;
if (state->ks_composed_char > UCHAR_MAX) {
KBDMUX_UNLOCK(state);
return (ERRKEY);
}
goto next_code;
case 0x52: /* keypad 0 */
state->ks_composed_char *= 10;
if (state->ks_composed_char > UCHAR_MAX) {
KBDMUX_UNLOCK(state);
return (ERRKEY);
}
goto next_code;
/* key released, no interest here */
case 0xC7: case 0xC8: case 0xC9: /* keypad 7,8,9 */
case 0xCB: case 0xCC: case 0xCD: /* keypad 4,5,6 */
case 0xCF: case 0xD0: case 0xD1: /* keypad 1,2,3 */
case 0xD2: /* keypad 0 */
goto next_code;
case 0x38: /* left alt key */
break;
default:
if (state->ks_composed_char > 0) {
state->ks_flags &= ~COMPOSE;
state->ks_composed_char = 0;
KBDMUX_UNLOCK(state);
return (ERRKEY);
}
break;
}
}
/* keycode to key action */
action = genkbd_keyaction(kbd, keycode, scancode & 0x80,
&state->ks_state, &state->ks_accents);
if (action == NOKEY)
goto next_code;
KBDMUX_UNLOCK(state);
return (action);
}
/*
* Check if char is waiting
*/
static int
kbdmux_check_char(keyboard_t *kbd)
{
kbdmux_state_t *state = (kbdmux_state_t *) kbd->kb_data;
int ready;
if (!KBD_IS_ACTIVE(kbd))
return (FALSE);
KBDMUX_LOCK(state);
if (!(state->ks_flags & COMPOSE) && (state->ks_composed_char != 0))
ready = TRUE;
else
ready = (state->ks_inq.c_cc > 0)? TRUE : FALSE;
KBDMUX_UNLOCK(state);
return (ready);
}
/*
* Keyboard ioctl's
*/
static int
kbdmux_ioctl(keyboard_t *kbd, u_long cmd, caddr_t arg)
{
static int delays[] = {
250, 500, 750, 1000
};
static int rates[] = {
34, 38, 42, 46, 50, 55, 59, 63,
68, 76, 84, 92, 100, 110, 118, 126,
136, 152, 168, 184, 200, 220, 236, 252,
272, 304, 336, 368, 400, 440, 472, 504
};
kbdmux_state_t *state = (kbdmux_state_t *) kbd->kb_data;
kbdmux_kbd_t *k;
keyboard_info_t *ki;
int error = 0, mode;
#ifdef COMPAT_FREEBSD6
int ival;
#endif
if (state == NULL)
return (ENXIO);
switch (cmd) {
case KBADDKBD: /* add keyboard to the mux */
ki = (keyboard_info_t *) arg;
if (ki == NULL || ki->kb_unit < 0 || ki->kb_name[0] == '\0' ||
strcmp(ki->kb_name, "*") == 0)
return (EINVAL); /* bad input */
KBDMUX_LOCK(state);
SLIST_FOREACH(k, &state->ks_kbds, next)
if (k->kbd->kb_unit == ki->kb_unit &&
strcmp(k->kbd->kb_name, ki->kb_name) == 0)
break;
if (k != NULL) {
KBDMUX_UNLOCK(state);
return (0); /* keyboard already in the mux */
}
k = malloc(sizeof(*k), M_KBDMUX, M_NOWAIT | M_ZERO);
if (k == NULL) {
KBDMUX_UNLOCK(state);
return (ENOMEM); /* out of memory */
}
k->kbd = kbd_get_keyboard(
kbd_allocate(
ki->kb_name,
ki->kb_unit,
(void *) &k->kbd,
kbdmux_kbd_event, (void *) state));
if (k->kbd == NULL) {
KBDMUX_UNLOCK(state);
free(k, M_KBDMUX);
return (EINVAL); /* bad keyboard */
}
kbdd_enable(k->kbd);
kbdd_clear_state(k->kbd);
/* set K_RAW mode on slave keyboard */
mode = K_RAW;
error = kbdd_ioctl(k->kbd, KDSKBMODE, (caddr_t)&mode);
if (error == 0) {
/* set lock keys state on slave keyboard */
mode = state->ks_state & LOCK_MASK;
error = kbdd_ioctl(k->kbd, KDSKBSTATE, (caddr_t)&mode);
}
if (error != 0) {
KBDMUX_UNLOCK(state);
kbd_release(k->kbd, &k->kbd);
k->kbd = NULL;
free(k, M_KBDMUX);
return (error); /* could not set mode */
}
SLIST_INSERT_HEAD(&state->ks_kbds, k, next);
KBDMUX_UNLOCK(state);
break;
case KBRELKBD: /* release keyboard from the mux */
ki = (keyboard_info_t *) arg;
if (ki == NULL || ki->kb_unit < 0 || ki->kb_name[0] == '\0' ||
strcmp(ki->kb_name, "*") == 0)
return (EINVAL); /* bad input */
KBDMUX_LOCK(state);
SLIST_FOREACH(k, &state->ks_kbds, next)
if (k->kbd->kb_unit == ki->kb_unit &&
strcmp(k->kbd->kb_name, ki->kb_name) == 0)
break;
if (k != NULL) {
error = kbd_release(k->kbd, &k->kbd);
if (error == 0) {
SLIST_REMOVE(&state->ks_kbds, k, kbdmux_kbd, next);
k->kbd = NULL;
free(k, M_KBDMUX);
}
} else
error = ENXIO; /* keyboard is not in the mux */
KBDMUX_UNLOCK(state);
break;
case KDGKBMODE: /* get kyboard mode */
KBDMUX_LOCK(state);
*(int *)arg = state->ks_mode;
KBDMUX_UNLOCK(state);
break;
#ifdef COMPAT_FREEBSD6
case _IO('K', 7):
ival = IOCPARM_IVAL(arg);
arg = (caddr_t)&ival;
/* FALLTHROUGH */
#endif
case KDSKBMODE: /* set keyboard mode */
KBDMUX_LOCK(state);
switch (*(int *)arg) {
case K_XLATE:
if (state->ks_mode != K_XLATE) {
/* make lock key state and LED state match */
state->ks_state &= ~LOCK_MASK;
state->ks_state |= KBD_LED_VAL(kbd);
}
/* FALLTHROUGH */
case K_RAW:
case K_CODE:
if (state->ks_mode != *(int *)arg) {
kbdmux_clear_state_locked(state);
state->ks_mode = *(int *)arg;
}
break;
default:
error = EINVAL;
break;
}
KBDMUX_UNLOCK(state);
break;
case KDGETLED: /* get keyboard LED */
KBDMUX_LOCK(state);
*(int *)arg = KBD_LED_VAL(kbd);
KBDMUX_UNLOCK(state);
break;
#ifdef COMPAT_FREEBSD6
case _IO('K', 66):
ival = IOCPARM_IVAL(arg);
arg = (caddr_t)&ival;
/* FALLTHROUGH */
#endif
case KDSETLED: /* set keyboard LED */
KBDMUX_LOCK(state);
/* NOTE: lock key state in ks_state won't be changed */
if (*(int *)arg & ~LOCK_MASK) {
KBDMUX_UNLOCK(state);
return (EINVAL);
}
KBD_LED_VAL(kbd) = *(int *)arg;
/* KDSETLED on all slave keyboards */
SLIST_FOREACH(k, &state->ks_kbds, next)
kbdd_ioctl(k->kbd, KDSETLED, arg);
KBDMUX_UNLOCK(state);
break;
case KDGKBSTATE: /* get lock key state */
KBDMUX_LOCK(state);
*(int *)arg = state->ks_state & LOCK_MASK;
KBDMUX_UNLOCK(state);
break;
#ifdef COMPAT_FREEBSD6
case _IO('K', 20):
ival = IOCPARM_IVAL(arg);
arg = (caddr_t)&ival;
/* FALLTHROUGH */
#endif
case KDSKBSTATE: /* set lock key state */
KBDMUX_LOCK(state);
if (*(int *)arg & ~LOCK_MASK) {
KBDMUX_UNLOCK(state);
return (EINVAL);
}
state->ks_state &= ~LOCK_MASK;
state->ks_state |= *(int *)arg;
/* KDSKBSTATE on all slave keyboards */
SLIST_FOREACH(k, &state->ks_kbds, next)
kbdd_ioctl(k->kbd, KDSKBSTATE, arg);
KBDMUX_UNLOCK(state);
return (kbdmux_ioctl(kbd, KDSETLED, arg));
/* NOT REACHED */
#ifdef COMPAT_FREEBSD6
case _IO('K', 67):
cmd = KDSETRAD;
ival = IOCPARM_IVAL(arg);
arg = (caddr_t)&ival;
/* FALLTHROUGH */
#endif
case KDSETREPEAT: /* set keyboard repeat rate (new interface) */
case KDSETRAD: /* set keyboard repeat rate (old interface) */
KBDMUX_LOCK(state);
if (cmd == KDSETREPEAT) {
int i;
/* lookup delay */
for (i = sizeof(delays)/sizeof(delays[0]) - 1; i > 0; i --)
if (((int *)arg)[0] >= delays[i])
break;
mode = i << 5;
/* lookup rate */
for (i = sizeof(rates)/sizeof(rates[0]) - 1; i > 0; i --)
if (((int *)arg)[1] >= rates[i])
break;
mode |= i;
} else
mode = *(int *)arg;
if (mode & ~0x7f) {
KBDMUX_UNLOCK(state);
return (EINVAL);
}
kbd->kb_delay1 = delays[(mode >> 5) & 3];
kbd->kb_delay2 = rates[mode & 0x1f];
/* perform command on all slave keyboards */
SLIST_FOREACH(k, &state->ks_kbds, next)
kbdd_ioctl(k->kbd, cmd, arg);
KBDMUX_UNLOCK(state);
break;
case PIO_KEYMAP: /* set keyboard translation table */
case PIO_KEYMAPENT: /* set keyboard translation table entry */
case PIO_DEADKEYMAP: /* set accent key translation table */
KBDMUX_LOCK(state);
state->ks_accents = 0;
/* perform command on all slave keyboards */
SLIST_FOREACH(k, &state->ks_kbds, next)
kbdd_ioctl(k->kbd, cmd, arg);
KBDMUX_UNLOCK(state);
/* FALLTHROUGH */
default:
error = genkbd_commonioctl(kbd, cmd, arg);
break;
}
return (error);
}
/*
* Lock the access to the keyboard
*/
static int
kbdmux_lock(keyboard_t *kbd, int lock)
{
return (1); /* XXX */
}
/*
* Clear the internal state of the keyboard
*/
static void
kbdmux_clear_state_locked(kbdmux_state_t *state)
{
KBDMUX_LOCK_ASSERT(state, MA_OWNED);
state->ks_flags &= ~(COMPOSE|POLLING);
state->ks_state &= LOCK_MASK; /* preserve locking key state */
state->ks_accents = 0;
state->ks_composed_char = 0;
/* state->ks_prefix = 0; XXX */
ndflush(&state->ks_inq, state->ks_inq.c_cc);
}
static void
kbdmux_clear_state(keyboard_t *kbd)
{
kbdmux_state_t *state = (kbdmux_state_t *) kbd->kb_data;
KBDMUX_LOCK(state);
kbdmux_clear_state_locked(state);
KBDMUX_UNLOCK(state);
}
/*
* Save the internal state
*/
static int
kbdmux_get_state(keyboard_t *kbd, void *buf, size_t len)
{
if (len == 0)
return (sizeof(kbdmux_state_t));
if (len < sizeof(kbdmux_state_t))
return (-1);
bcopy(kbd->kb_data, buf, sizeof(kbdmux_state_t)); /* XXX locking? */
return (0);
}
/*
* Set the internal state
*/
static int
kbdmux_set_state(keyboard_t *kbd, void *buf, size_t len)
{
if (len < sizeof(kbdmux_state_t))
return (ENOMEM);
bcopy(buf, kbd->kb_data, sizeof(kbdmux_state_t)); /* XXX locking? */
return (0);
}
/*
* Set polling
*/
static int
kbdmux_poll(keyboard_t *kbd, int on)
{
kbdmux_state_t *state = (kbdmux_state_t *) kbd->kb_data;
kbdmux_kbd_t *k;
KBDMUX_LOCK(state);
if (on)
state->ks_flags |= POLLING;
else
state->ks_flags &= ~POLLING;
/* set poll on slave keyboards */
SLIST_FOREACH(k, &state->ks_kbds, next)
kbdd_poll(k->kbd, on);
KBDMUX_UNLOCK(state);
return (0);
}
/*****************************************************************************
*****************************************************************************
** Module
*****************************************************************************
*****************************************************************************/
KEYBOARD_DRIVER(kbdmux, kbdmuxsw, kbdmux_configure);
static int
kbdmux_modevent(module_t mod, int type, void *data)
{
keyboard_switch_t *sw;
keyboard_t *kbd;
int error;
switch (type) {
case MOD_LOAD:
if ((error = kbd_add_driver(&kbdmux_kbd_driver)) != 0)
break;
if ((sw = kbd_get_switch(KEYBOARD_NAME)) == NULL) {
kbd_delete_driver(&kbdmux_kbd_driver);
error = ENXIO;
break;
}
kbd = NULL;
if ((error = (*sw->probe)(0, NULL, 0)) != 0 ||
(error = (*sw->init)(0, &kbd, NULL, 0)) != 0) {
kbd_delete_driver(&kbdmux_kbd_driver);
break;
}
#ifdef KBD_INSTALL_CDEV
if ((error = kbd_attach(kbd)) != 0) {
(*sw->term)(kbd);
kbd_delete_driver(&kbdmux_kbd_driver);
break;
}
#endif
if ((error = (*sw->enable)(kbd)) != 0) {
(*sw->disable)(kbd);
#ifdef KBD_INSTALL_CDEV
kbd_detach(kbd);
#endif
(*sw->term)(kbd);
kbd_delete_driver(&kbdmux_kbd_driver);
break;
}
break;
case MOD_UNLOAD:
if ((sw = kbd_get_switch(KEYBOARD_NAME)) == NULL)
panic("kbd_get_switch(" KEYBOARD_NAME ") == NULL");
kbd = kbd_get_keyboard(kbd_find_keyboard(KEYBOARD_NAME, 0));
if (kbd != NULL) {
(*sw->disable)(kbd);
#ifdef KBD_INSTALL_CDEV
kbd_detach(kbd);
#endif
(*sw->term)(kbd);
kbd_delete_driver(&kbdmux_kbd_driver);
}
error = 0;
break;
default:
error = EOPNOTSUPP;
break;
}
return (error);
}
DEV_MODULE(kbdmux, kbdmux_modevent, NULL);
Reference in New Issue View Git Blame Copy Permalink