/* * Copyright (c) 1999 FreeBSD(98) port team. * 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 as * the first lines of this file unmodified. * 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. * 3. The name of the author may not be used to endorse or promote products * derived from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 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. * * $FreeBSD$ */ #include "pckbd.h" #include "opt_kbd.h" #if NPCKBD > 0 #include #include #include #include #include #include #include #include #include #include #include #include #define DRIVER_NAME "pckbd" /* device configuration flags */ #define KB_CONF_FAIL_IF_NO_KBD (1 << 0) /* don't install if no kbd is found */ static devclass_t pckbd_devclass; static int pckbdprobe(device_t dev); static int pckbdattach(device_t dev); static void pckbd_isa_intr(void *arg); static device_method_t pckbd_methods[] = { /* Device interface */ DEVMETHOD(device_probe, pckbdprobe), DEVMETHOD(device_attach, pckbdattach), { 0, 0 } }; static driver_t pckbd_driver = { DRIVER_NAME, pckbd_methods, 1, }; DRIVER_MODULE(pckbd, isa, pckbd_driver, pckbd_devclass, 0, 0); static int pckbd_probe_unit(int unit, int port, int irq, int flags); static int pckbd_attach_unit(int unit, keyboard_t **kbd, int port, int irq, int flags); static timeout_t pckbd_timeout; static int pckbdprobe(device_t dev) { /* Check isapnp ids */ if (isa_get_vendorid(dev)) return (ENXIO); device_set_desc(dev, "PC-98 Keyboard"); return pckbd_probe_unit(device_get_unit(dev), isa_get_port(dev), (1 << isa_get_irq(dev)), device_get_flags(dev)); } static int pckbdattach(device_t dev) { keyboard_t *kbd; void *ih; struct resource *res; int zero = 0; pckbd_attach_unit(device_get_unit(dev), &kbd, isa_get_port(dev), (1 << isa_get_irq(dev)), device_get_flags(dev)); res = bus_alloc_resource(dev, SYS_RES_IRQ, &zero, 0ul, ~0ul, 1, RF_SHAREABLE | RF_ACTIVE); BUS_SETUP_INTR(device_get_parent(dev), dev, res, INTR_TYPE_TTY, pckbd_isa_intr, kbd, &ih); return (0); } static void pckbd_isa_intr(void *arg) { keyboard_t *kbd = arg; (*kbdsw[kbd->kb_index]->intr)(kbd, NULL); } static int pckbd_probe_unit(int unit, int port, int irq, int flags) { keyboard_switch_t *sw; int args[2]; int error; sw = kbd_get_switch(DRIVER_NAME); if (sw == NULL) return ENXIO; args[0] = port; args[1] = irq; error = (*sw->probe)(unit, args, flags); if (error) return error; return 0; } static int pckbd_attach_unit(int unit, keyboard_t **kbd, int port, int irq, int flags) { keyboard_switch_t *sw; int args[2]; int error; sw = kbd_get_switch(DRIVER_NAME); if (sw == NULL) return ENXIO; /* reset, initialize and enable the device */ args[0] = port; args[1] = irq; *kbd = NULL; error = (*sw->probe)(unit, args, flags); if (error) return error; error = (*sw->init)(unit, kbd, args, flags); if (error) return error; (*sw->enable)(*kbd); #ifdef KBD_INSTALL_CDEV /* attach a virtual keyboard cdev */ error = kbd_attach(*kbd); if (error) return error; #endif /* KBD_INSTALL_CDEV */ /* * This is a kludge to compensate for lost keyboard interrupts. * A similar code used to be in syscons. See below. XXX */ pckbd_timeout(*kbd); if (bootverbose) (*sw->diag)(*kbd, bootverbose); return 0; } static void pckbd_timeout(void *arg) { keyboard_t *kbd; int s; /* The following comments are extracted from syscons.c (1.287) */ /* * With release 2.1 of the Xaccel server, the keyboard is left * hanging pretty often. Apparently an interrupt from the * keyboard is lost, and I don't know why (yet). * This ugly hack calls scintr if input is ready for the keyboard * and conveniently hides the problem. XXX */ /* * Try removing anything stuck in the keyboard controller; whether * it's a keyboard scan code or mouse data. `scintr()' doesn't * read the mouse data directly, but `kbdio' routines will, as a * side effect. */ s = spltty(); kbd = (keyboard_t *)arg; if ((*kbdsw[kbd->kb_index]->lock)(kbd, TRUE)) { /* * We have seen the lock flag is not set. Let's reset * the flag early, otherwise the LED update routine fails * which may want the lock during the interrupt routine. */ (*kbdsw[kbd->kb_index]->lock)(kbd, FALSE); if ((*kbdsw[kbd->kb_index]->check_char)(kbd)) (*kbdsw[kbd->kb_index]->intr)(kbd, NULL); } splx(s); timeout(pckbd_timeout, arg, hz/10); } /* LOW-LEVEL */ #include #include #include #define PC98KBD_DEFAULT 0 typedef caddr_t KBDC; typedef struct pckbd_state { KBDC kbdc; /* keyboard controller */ int ks_mode; /* input mode (K_XLATE,K_RAW,K_CODE) */ int ks_flags; /* flags */ #define COMPOSE (1 << 0) int ks_state; /* shift/lock key state */ int ks_accents; /* accent key index (> 0) */ u_int ks_composed_char; /* composed char code (> 0) */ } pckbd_state_t; /* keyboard driver declaration */ static int pckbd_configure(int flags); static kbd_probe_t pckbd_probe; static kbd_init_t pckbd_init; static kbd_term_t pckbd_term; static kbd_intr_t pckbd_intr; static kbd_test_if_t pckbd_test_if; static kbd_enable_t pckbd_enable; static kbd_disable_t pckbd_disable; static kbd_read_t pckbd_read; static kbd_check_t pckbd_check; static kbd_read_char_t pckbd_read_char; static kbd_check_char_t pckbd_check_char; static kbd_ioctl_t pckbd_ioctl; static kbd_lock_t pckbd_lock; static kbd_clear_state_t pckbd_clear_state; static kbd_get_state_t pckbd_get_state; static kbd_set_state_t pckbd_set_state; static kbd_poll_mode_t pckbd_poll; keyboard_switch_t pckbdsw = { pckbd_probe, pckbd_init, pckbd_term, pckbd_intr, pckbd_test_if, pckbd_enable, pckbd_disable, pckbd_read, pckbd_check, pckbd_read_char, pckbd_check_char, pckbd_ioctl, pckbd_lock, pckbd_clear_state, pckbd_get_state, pckbd_set_state, genkbd_get_fkeystr, pckbd_poll, genkbd_diag, }; KEYBOARD_DRIVER(pckbd, pckbdsw, pckbd_configure); struct kbdc_softc { int port; /* base port address */ int lock; /* FIXME: XXX not quite a semaphore... */ }; /* local functions */ static int probe_keyboard(KBDC kbdc, int flags); static int init_keyboard(KBDC kbdc, int *type, int flags); static KBDC kbdc_open(int port); static int kbdc_lock(KBDC kbdc, int lock); static int kbdc_data_ready(KBDC kbdc); static int read_kbd_data(KBDC kbdc); static int read_kbd_data_no_wait(KBDC kbdc); static int wait_for_kbd_data(struct kbdc_softc *kbdc); /* local variables */ /* the initial key map, accent map and fkey strings */ #include /* structures for the default keyboard */ static keyboard_t default_kbd; static pckbd_state_t default_kbd_state; static keymap_t default_keymap; static accentmap_t default_accentmap; static fkeytab_t default_fkeytab[NUM_FKEYS]; /* * The back door to the keyboard driver! * This function is called by the console driver, via the kbdio module, * to tickle keyboard drivers when the low-level console is being initialized. * Almost nothing in the kernel has been initialied yet. Try to probe * keyboards if possible. * NOTE: because of the way the low-level conole is initialized, this routine * may be called more than once!! */ static int pckbd_configure(int flags) { keyboard_t *kbd; int arg[2]; int i; /* XXX: a kludge to obtain the device configuration flags */ if (resource_int_value(DRIVER_NAME, 0, "flags", &i) == 0) { flags |= i; /* if the driver is disabled, unregister the keyboard if any */ if (resource_int_value(DRIVER_NAME, 0, "disabled", &i) == 0 && i != 0) { i = kbd_find_keyboard(DRIVER_NAME, PC98KBD_DEFAULT); if (i >= 0) { kbd = kbd_get_keyboard(i); kbd_unregister(kbd); kbd->kb_flags &= ~KB_REGISTERED; return 0; } } } /* probe the default keyboard */ arg[0] = -1; arg[1] = -1; kbd = NULL; if (pckbd_probe(PC98KBD_DEFAULT, arg, flags)) return 0; if (pckbd_init(PC98KBD_DEFAULT, &kbd, arg, flags)) return 0; /* return the number of found keyboards */ return 1; } /* low-level functions */ /* detect a keyboard */ static int pckbd_probe(int unit, void *arg, int flags) { KBDC kbdc; int *data = (int *)arg; if (unit != PC98KBD_DEFAULT) return ENXIO; if (KBD_IS_PROBED(&default_kbd)) return 0; kbdc = kbdc_open(data[0]); if (kbdc == NULL) return ENXIO; if (probe_keyboard(kbdc, flags)) { if (flags & KB_CONF_FAIL_IF_NO_KBD) return ENXIO; } return 0; } /* reset and initialize the device */ static int pckbd_init(int unit, keyboard_t **kbdp, void *arg, int flags) { keyboard_t *kbd; pckbd_state_t *state; keymap_t *keymap; accentmap_t *accmap; fkeytab_t *fkeymap; int fkeymap_size; int *data = (int *)arg; if (unit != PC98KBD_DEFAULT) /* shouldn't happen */ return ENXIO; *kbdp = kbd = &default_kbd; state = &default_kbd_state; if (!KBD_IS_PROBED(kbd)) { keymap = &default_keymap; accmap = &default_accentmap; fkeymap = default_fkeytab; fkeymap_size = sizeof(default_fkeytab)/sizeof(default_fkeytab[0]); state->kbdc = kbdc_open(data[0]); if (state->kbdc == NULL) return ENXIO; kbd_init_struct(kbd, DRIVER_NAME, KB_OTHER, unit, flags, data[0], IO_KBDSIZE); 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; if (probe_keyboard(state->kbdc, flags)) {/* shouldn't happen */ if (flags & KB_CONF_FAIL_IF_NO_KBD) return ENXIO; } else { KBD_FOUND_DEVICE(kbd); } pckbd_clear_state(kbd); state->ks_mode = K_XLATE; KBD_PROBE_DONE(kbd); } if (!KBD_IS_INITIALIZED(kbd) && !(flags & KB_CONF_PROBE_ONLY)) { if (KBD_HAS_DEVICE(kbd) && init_keyboard(state->kbdc, &kbd->kb_type, kbd->kb_config) && (kbd->kb_config & KB_CONF_FAIL_IF_NO_KBD)) return ENXIO; pckbd_ioctl(kbd, KDSETLED, (caddr_t)&state->ks_state); KBD_INIT_DONE(kbd); } if (!KBD_IS_CONFIGURED(kbd)) { if (kbd_register(kbd) < 0) return ENXIO; KBD_CONFIG_DONE(kbd); } return 0; } /* finish using this keyboard */ static int pckbd_term(keyboard_t *kbd) { kbd_unregister(kbd); return 0; } /* keyboard interrupt routine */ static int pckbd_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 = pckbd_read_char(kbd, FALSE); } while (c != NOKEY); } return 0; } /* test the interface to the device */ static int pckbd_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 pckbd_enable(keyboard_t *kbd) { int s; s = spltty(); KBD_ACTIVATE(kbd); splx(s); return 0; } /* disallow the access to the device */ static int pckbd_disable(keyboard_t *kbd) { int s; s = spltty(); KBD_DEACTIVATE(kbd); splx(s); return 0; } /* read one byte from the keyboard if it's allowed */ static int pckbd_read(keyboard_t *kbd, int wait) { int c; if (wait) c = read_kbd_data(((pckbd_state_t *)kbd->kb_data)->kbdc); else c = read_kbd_data_no_wait(((pckbd_state_t *)kbd->kb_data)->kbdc); if (c != -1) ++kbd->kb_count; return (KBD_IS_ACTIVE(kbd) ? c : -1); } /* check if data is waiting */ static int pckbd_check(keyboard_t *kbd) { if (!KBD_IS_ACTIVE(kbd)) return FALSE; return kbdc_data_ready(((pckbd_state_t *)kbd->kb_data)->kbdc); } /* read char from the keyboard */ static u_int pckbd_read_char(keyboard_t *kbd, int wait) { pckbd_state_t *state; u_int action; int scancode; int keycode; state = (pckbd_state_t *)kbd->kb_data; 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) return ERRKEY; return action; } /* see if there is something in the keyboard port */ if (wait) { do { scancode = read_kbd_data(state->kbdc); } while (scancode == -1); } else { scancode = read_kbd_data_no_wait(state->kbdc); if (scancode == -1) return NOKEY; } ++kbd->kb_count; #if 0 printf("pckbd_read_char(): scancode:0x%x\n", scancode); #endif /* return the byte as is for the K_RAW mode */ if (state->ks_mode == K_RAW) return scancode; /* translate the scan code into a keycode */ keycode = scancode & 0x7F; switch(scancode) { case 0xF3: /* GRPH (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 0x73: /* GRPH (compose key) pressed */ if (!(state->ks_flags & COMPOSE)) { state->ks_flags |= COMPOSE; state->ks_composed_char = 0; } break; } /* return the key code in the K_CODE mode */ if (state->ks_mode == K_CODE) return (keycode | (scancode & 0x80)); /* compose a character code */ if (state->ks_flags & COMPOSE) { switch (scancode) { /* key pressed, process it */ case 0x42: case 0x43: case 0x44: /* keypad 7,8,9 */ state->ks_composed_char *= 10; state->ks_composed_char += scancode - 0x3B; if (state->ks_composed_char > UCHAR_MAX) return ERRKEY; goto next_code; case 0x46: case 0x47: case 0x48: /* keypad 4,5,6 */ state->ks_composed_char *= 10; state->ks_composed_char += scancode - 0x42; if (state->ks_composed_char > UCHAR_MAX) return ERRKEY; goto next_code; case 0x4A: case 0x4B: case 0x4C: /* keypad 1,2,3 */ state->ks_composed_char *= 10; state->ks_composed_char += scancode - 0x49; if (state->ks_composed_char > UCHAR_MAX) return ERRKEY; goto next_code; case 0x4E: /* keypad 0 */ state->ks_composed_char *= 10; if (state->ks_composed_char > UCHAR_MAX) return ERRKEY; goto next_code; /* key released, no interest here */ case 0xC2: case 0xC3: case 0xC4: /* keypad 7,8,9 */ case 0xC6: case 0xC7: case 0xC8: /* keypad 4,5,6 */ case 0xCA: case 0xCB: case 0xCC: /* keypad 1,2,3 */ case 0xCE: /* keypad 0 */ goto next_code; case 0x73: /* GRPH key */ break; default: if (state->ks_composed_char > 0) { state->ks_flags &= ~COMPOSE; state->ks_composed_char = 0; 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; else return action; } /* check if char is waiting */ static int pckbd_check_char(keyboard_t *kbd) { pckbd_state_t *state; if (!KBD_IS_ACTIVE(kbd)) return FALSE; state = (pckbd_state_t *)kbd->kb_data; if (!(state->ks_flags & COMPOSE) && (state->ks_composed_char > 0)) return TRUE; return kbdc_data_ready(state->kbdc); } /* some useful control functions */ static int pckbd_ioctl(keyboard_t *kbd, u_long cmd, caddr_t arg) { pckbd_state_t *state = kbd->kb_data; int s; int i; s = spltty(); switch (cmd) { case KDGKBMODE: /* get keyboard mode */ *(int *)arg = state->ks_mode; break; case KDSKBMODE: /* set keyboard mode */ 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); } /* FALL THROUGH */ case K_RAW: case K_CODE: if (state->ks_mode != *(int *)arg) { pckbd_clear_state(kbd); state->ks_mode = *(int *)arg; } break; default: splx(s); return EINVAL; } break; case KDGETLED: /* get keyboard LED */ *(int *)arg = KBD_LED_VAL(kbd); break; case KDSETLED: /* set keyboard LED */ /* NOTE: lock key state in ks_state won't be changed */ if (*(int *)arg & ~LOCK_MASK) { splx(s); return EINVAL; } i = *(int *)arg; /* replace CAPS LED with ALTGR LED for ALTGR keyboards */ if (kbd->kb_keymap->n_keys > ALTGR_OFFSET) { if (i & ALKED) i |= CLKED; else i &= ~CLKED; } KBD_LED_VAL(kbd) = *(int *)arg; break; case KDGKBSTATE: /* get lock key state */ *(int *)arg = state->ks_state & LOCK_MASK; break; case KDSKBSTATE: /* set lock key state */ if (*(int *)arg & ~LOCK_MASK) { splx(s); return EINVAL; } state->ks_state &= ~LOCK_MASK; state->ks_state |= *(int *)arg; splx(s); /* set LEDs and quit */ return pckbd_ioctl(kbd, KDSETLED, arg); case KDSETRAD: /* set keyboard repeat rate (old interface)*/ break; case KDSETREPEAT: /* set keyboard repeat rate (new interface) */ break; case PIO_KEYMAP: /* set keyboard translation table */ case PIO_KEYMAPENT: /* set keyboard translation table entry */ case PIO_DEADKEYMAP: /* set accent key translation table */ state->ks_accents = 0; /* FALL THROUGH */ default: splx(s); return genkbd_commonioctl(kbd, cmd, arg); } splx(s); return 0; } /* lock the access to the keyboard */ static int pckbd_lock(keyboard_t *kbd, int lock) { return kbdc_lock(((pckbd_state_t *)kbd->kb_data)->kbdc, lock); } /* clear the internal state of the keyboard */ static void pckbd_clear_state(keyboard_t *kbd) { pckbd_state_t *state; state = (pckbd_state_t *)kbd->kb_data; state->ks_flags = 0; state->ks_state &= LOCK_MASK; /* preserve locking key state */ state->ks_accents = 0; state->ks_composed_char = 0; } /* save the internal state */ static int pckbd_get_state(keyboard_t *kbd, void *buf, size_t len) { if (len == 0) return sizeof(pckbd_state_t); if (len < sizeof(pckbd_state_t)) return -1; bcopy(kbd->kb_data, buf, sizeof(pckbd_state_t)); return 0; } /* set the internal state */ static int pckbd_set_state(keyboard_t *kbd, void *buf, size_t len) { if (len < sizeof(pckbd_state_t)) return ENOMEM; if (((pckbd_state_t *)kbd->kb_data)->kbdc != ((pckbd_state_t *)buf)->kbdc) return ENOMEM; bcopy(buf, kbd->kb_data, sizeof(pckbd_state_t)); return 0; } /* set polling mode */ static int pckbd_poll(keyboard_t *kbd, int on) { return 0; } /* local functions */ static int probe_keyboard(KBDC kbdc, int flags) { return 0; } static int init_keyboard(KBDC kbdc, int *type, int flags) { *type = KB_OTHER; return 0; } /* keyboard I/O routines */ /* retry count */ #ifndef KBD_MAXRETRY #define KBD_MAXRETRY 3 #endif /* timing parameters */ #ifndef KBD_RESETDELAY #define KBD_RESETDELAY 200 /* wait 200msec after kbd/mouse reset */ #endif #ifndef KBD_MAXWAIT #define KBD_MAXWAIT 5 /* wait 5 times at most after reset */ #endif /* I/O recovery time */ #define KBDC_DELAYTIME 37 #define KBDD_DELAYTIME 37 /* I/O ports */ #define KBD_STATUS_PORT 2 /* status port, read */ #define KBD_DATA_PORT 0 /* data port, read */ /* status bits (KBD_STATUS_PORT) */ #define KBDS_BUFFER_FULL 0x0002 /* macros */ #define kbdcp(p) ((struct kbdc_softc *)(p)) /* local variables */ static struct kbdc_softc kbdc_softc[NPCKBD] = { { 0 }, }; /* associate a port number with a KBDC */ static KBDC kbdc_open(int port) { if (port <= 0) port = IO_KBD; if (NPCKBD) { /* PC-98 has only one keyboard I/F */ kbdc_softc[0].port = port; kbdc_softc[0].lock = FALSE; return (KBDC)&kbdc_softc[0]; } return NULL; /* You didn't include sc driver in your config file */ } /* set/reset polling lock */ static int kbdc_lock(KBDC p, int lock) { int prevlock; prevlock = kbdcp(p)->lock; kbdcp(p)->lock = lock; return (prevlock != lock); } /* check if any data is waiting to be processed */ static int kbdc_data_ready(KBDC p) { return (inb(kbdcp(p)->port + KBD_STATUS_PORT) & KBDS_BUFFER_FULL); } /* wait for data from the keyboard */ static int wait_for_kbd_data(struct kbdc_softc *kbdc) { /* CPU will stay inside the loop for 200msec at most */ int retry = 10000; int port = kbdc->port; while (!(inb(port + KBD_STATUS_PORT) & KBDS_BUFFER_FULL)) { DELAY(KBDD_DELAYTIME); DELAY(KBDC_DELAYTIME); if (--retry < 0) return 0; } DELAY(KBDD_DELAYTIME); return 1; } /* read one byte from the keyboard */ static int read_kbd_data(KBDC p) { if (!wait_for_kbd_data(kbdcp(p))) return -1; /* timeout */ DELAY(KBDC_DELAYTIME); return inb(kbdcp(p)->port + KBD_DATA_PORT); } /* read one byte from the keyboard, but return immediately if * no data is waiting */ static int read_kbd_data_no_wait(KBDC p) { if (inb(kbdcp(p)->port + KBD_STATUS_PORT) & KBDS_BUFFER_FULL) { DELAY(KBDD_DELAYTIME); return inb(kbdcp(p)->port + KBD_DATA_PORT); } return -1; /* no data */ } #endif /* NPCKBD > 0 */