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minix/drivers/tty/keyboard.c

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/* Keyboard driver for PC's and AT's.
*
* Changes:
* Jul 13, 2004 processes can observe function keys (Jorrit N. Herder)
* Jun 15, 2004 removed wreboot(), except panic dumps (Jorrit N. Herder)
* Feb 04, 1994 loadable keymaps (Marcus Hampel)
*/
#include "../drivers.h"
#include <sys/ioctl.h>
#include <sys/kbdio.h>
#include <sys/time.h>
#include <sys/select.h>
#include <termios.h>
#include <signal.h>
#include <unistd.h>
#include <minix/callnr.h>
#include <minix/com.h>
#include <minix/keymap.h>
#include "tty.h"
#include "keymaps/us-std.src"
#include "../../kernel/const.h"
#include "../../kernel/config.h"
#include "../../kernel/type.h"
#include "../../kernel/proc.h"
int irq_hook_id = -1;
int aux_irq_hook_id = -1;
/* Standard and AT keyboard. (PS/2 MCA implies AT throughout.) */
#define KEYBD 0x60 /* I/O port for keyboard data */
/* AT keyboard. */
#define KB_COMMAND 0x64 /* I/O port for commands on AT */
#define KB_STATUS 0x64 /* I/O port for status on AT */
#define KB_ACK 0xFA /* keyboard ack response */
#define KB_AUX_BYTE 0x20 /* Auxiliary Device Output Buffer Full */
#define KB_OUT_FULL 0x01 /* status bit set when keypress char pending */
#define KB_IN_FULL 0x02 /* status bit set when not ready to receive */
#define KBC_RD_RAM_CCB 0x20 /* Read controller command byte */
#define KBC_WR_RAM_CCB 0x60 /* Write controller command byte */
#define KBC_DI_AUX 0xA7 /* Disable Auxiliary Device */
#define KBC_EN_AUX 0xA8 /* Enable Auxiliary Device */
#define KBC_DI_KBD 0xAD /* Disable Keybard Interface */
#define KBC_EN_KBD 0xAE /* Enable Keybard Interface */
#define KBC_WRITE_AUX 0xD4 /* Write to Auxiliary Device */
#define LED_CODE 0xED /* command to keyboard to set LEDs */
#define MAX_KB_ACK_RETRIES 0x1000 /* max #times to wait for kb ack */
#define MAX_KB_BUSY_RETRIES 0x1000 /* max #times to loop while kb busy */
#define KBIT 0x80 /* bit used to ack characters to keyboard */
#define KBC_IN_DELAY 7 /* wait 7 microseconds when polling */
/* Miscellaneous. */
#define ESC_SCAN 0x01 /* reboot key when panicking */
#define SLASH_SCAN 0x35 /* to recognize numeric slash */
#define RSHIFT_SCAN 0x36 /* to distinguish left and right shift */
#define HOME_SCAN 0x47 /* first key on the numeric keypad */
#define INS_SCAN 0x52 /* INS for use in CTRL-ALT-INS reboot */
#define DEL_SCAN 0x53 /* DEL for use in CTRL-ALT-DEL reboot */
#define KBD_BUFSZ 1024 /* Buffer size for raw scan codes */
#define KBD_OUT_BUFSZ 16 /* Output buffer to sending data to the
* keyboard.
*/
#define MICROS_TO_TICKS(m) (((m)*HZ/1000000)+1)
#define CONSOLE 0 /* line number for console */
#define KB_IN_BYTES 32 /* size of keyboard input buffer */
PRIVATE char ibuf[KB_IN_BYTES]; /* input buffer */
PRIVATE char *ihead = ibuf; /* next free spot in input buffer */
PRIVATE char *itail = ibuf; /* scan code to return to TTY */
PRIVATE int icount; /* # codes in buffer */
PRIVATE int esc; /* escape scan code detected? */
PRIVATE int alt_l; /* left alt key state */
PRIVATE int alt_r; /* right alt key state */
PRIVATE int alt; /* either alt key */
PRIVATE int ctrl_l; /* left control key state */
PRIVATE int ctrl_r; /* right control key state */
PRIVATE int ctrl; /* either control key */
PRIVATE int shift_l; /* left shift key state */
PRIVATE int shift_r; /* right shift key state */
PRIVATE int shift; /* either shift key */
PRIVATE int num_down; /* num lock key depressed */
PRIVATE int caps_down; /* caps lock key depressed */
PRIVATE int scroll_down; /* scroll lock key depressed */
PRIVATE int locks[NR_CONS]; /* per console lock keys state */
/* Lock key active bits. Chosen to be equal to the keyboard LED bits. */
#define SCROLL_LOCK 0x01
#define NUM_LOCK 0x02
#define CAPS_LOCK 0x04
PRIVATE char numpad_map[] =
{'H', 'Y', 'A', 'B', 'D', 'C', 'V', 'U', 'G', 'S', 'T', '@'};
/* Variables and definition for observed function keys. */
typedef struct observer { int proc_nr; int events; } obs_t;
PRIVATE obs_t fkey_obs[12]; /* observers for F1-F12 */
PRIVATE obs_t sfkey_obs[12]; /* observers for SHIFT F1-F12 */
PRIVATE struct kbd
{
int minor;
int nr_open;
char buf[KBD_BUFSZ];
int offset;
int avail;
int req_size;
int req_proc;
vir_bytes req_addr;
int incaller;
int select_ops;
int select_proc;
} kbd, kbdaux;
/* Data that is to be sent to the keyboard. Each byte is ACKed by the
* keyboard.
*/
PRIVATE struct kbd_outack
{
unsigned char buf[KBD_OUT_BUFSZ];
int offset;
int avail;
int expect_ack;
} kbdout;
PRIVATE int kbd_watchdog_set= 0;
PRIVATE int kbd_alive= 1;
PRIVATE timer_t tmr_kbd_wd;
FORWARD _PROTOTYPE( void handle_req, (struct kbd *kbdp, message *m) );
FORWARD _PROTOTYPE( int handle_status, (struct kbd *kbdp, message *m) );
FORWARD _PROTOTYPE( void kbc_cmd0, (int cmd) );
FORWARD _PROTOTYPE( void kbc_cmd1, (int cmd, int data) );
FORWARD _PROTOTYPE( int kbc_read, (void) );
FORWARD _PROTOTYPE( void kbd_send, (void) );
FORWARD _PROTOTYPE( int kb_ack, (void) );
FORWARD _PROTOTYPE( int kb_wait, (void) );
FORWARD _PROTOTYPE( int func_key, (int scode) );
FORWARD _PROTOTYPE( int scan_keyboard, (unsigned char *bp, int *isauxp) );
FORWARD _PROTOTYPE( unsigned make_break, (int scode) );
FORWARD _PROTOTYPE( void set_leds, (void) );
FORWARD _PROTOTYPE( void show_key_mappings, (void) );
FORWARD _PROTOTYPE( int kb_read, (struct tty *tp, int try) );
FORWARD _PROTOTYPE( unsigned map_key, (int scode) );
FORWARD _PROTOTYPE( void micro_delay, (unsigned long usecs) );
FORWARD _PROTOTYPE( void kbd_watchdog, (timer_t *tmrp) );
/*===========================================================================*
* do_kbd *
*===========================================================================*/
PUBLIC void do_kbd(message *m)
{
handle_req(&kbd, m);
}
/*===========================================================================*
* kbd_status *
*===========================================================================*/
PUBLIC int kbd_status(message *m)
{
int r;
r= handle_status(&kbd, m);
if (r)
return r;
return handle_status(&kbdaux, m);
}
/*===========================================================================*
* do_kbdaux *
*===========================================================================*/
PUBLIC void do_kbdaux(message *m)
{
handle_req(&kbdaux, m);
}
/*===========================================================================*
* handle_req *
*===========================================================================*/
PRIVATE void handle_req(kbdp, m)
struct kbd *kbdp;
message *m;
{
int i, n, r, ops, watch;
unsigned char c;
/* Execute the requested device driver function. */
r= EINVAL; /* just in case */
switch (m->m_type) {
case DEV_OPEN:
kbdp->nr_open++;
r= OK;
break;
case DEV_CLOSE:
kbdp->nr_open--;
if (kbdp->nr_open < 0)
{
printf("TTY(kbd): open count is negative\n");
kbdp->nr_open= 0;
}
if (kbdp->nr_open == 0)
kbdp->avail= 0;
r= OK;
break;
case DEV_READ:
if (kbdp->req_size)
{
/* We handle only request at a time */
r= EIO;
break;
}
if (kbdp->avail == 0)
{
/* Should record proc */
kbdp->req_size= m->COUNT;
kbdp->req_proc= m->IO_ENDPT;
kbdp->req_addr= (vir_bytes)m->ADDRESS;
kbdp->incaller= m->m_source;
r= SUSPEND;
break;
}
/* Handle read request */
n= kbdp->avail;
if (n > m->COUNT)
n= m->COUNT;
if (kbdp->offset + n > KBD_BUFSZ)
n= KBD_BUFSZ-kbdp->offset;
if (n <= 0)
panic("TTY", "do_kbd(READ): bad n", n);
r= sys_vircopy(SELF, D, (vir_bytes)&kbdp->buf[kbdp->offset],
m->IO_ENDPT, D, (vir_bytes) m->ADDRESS, n);
if (r == OK)
{
kbdp->offset= (kbdp->offset+n) % KBD_BUFSZ;
kbdp->avail -= n;
r= n;
}
break;
case DEV_WRITE:
if (kbdp != &kbdaux)
{
printf("write to keyboard not implemented\n");
r= EINVAL;
break;
}
/* Assume that output to AUX only happens during
* initialization and we can afford to lose input. This should
* be fixed at a later time.
*/
for (i= 0; i<m->COUNT; i++)
{
r= sys_vircopy(m->IO_ENDPT, D, (vir_bytes) m->ADDRESS+i,
SELF, D, (vir_bytes)&c, 1);
if (r != OK)
break;
kbc_cmd1(KBC_WRITE_AUX, c);
}
r= i;
break;
case CANCEL:
kbdp->req_size= 0;
r= OK;
break;
case DEV_SELECT:
ops = m->IO_ENDPT & (SEL_RD|SEL_WR|SEL_ERR);
watch = (m->IO_ENDPT & SEL_NOTIFY) ? 1 : 0;
r= 0;
if (kbdp->avail && (ops & SEL_RD))
{
r |= SEL_RD;
break;
}
if (ops && watch)
{
kbdp->select_ops |= ops;
kbdp->select_proc= m->m_source;
}
break;
case DEV_IOCTL:
if (kbdp == &kbd && m->TTY_REQUEST == KIOCSLEDS)
{
kio_leds_t leds;
unsigned char b;
r= sys_vircopy(m->IO_ENDPT, D, (vir_bytes) m->ADDRESS,
SELF, D, (vir_bytes)&leds, sizeof(leds));
if (r != OK)
break;
b= 0;
if (leds.kl_bits & KBD_LEDS_NUM) b |= NUM_LOCK;
if (leds.kl_bits & KBD_LEDS_CAPS) b |= CAPS_LOCK;
if (leds.kl_bits & KBD_LEDS_SCROLL) b |= SCROLL_LOCK;
if (kbdout.avail == 0)
kbdout.offset= 0;
if (kbdout.offset + kbdout.avail + 2 > KBD_OUT_BUFSZ)
{
/* Output buffer is full. Ignore this command.
* Reset ACK flag.
*/
kbdout.expect_ack= 0;
}
else
{
kbdout.buf[kbdout.offset+kbdout.avail]=
LED_CODE;
kbdout.buf[kbdout.offset+kbdout.avail+1]= b;
kbdout.avail += 2;
}
if (!kbdout.expect_ack)
kbd_send();
r= OK;
break;
}
if (kbdp == &kbd && m->TTY_REQUEST == KIOCBELL)
{
kio_bell_t bell;
clock_t ticks;
r= sys_vircopy(m->IO_ENDPT, D, (vir_bytes) m->ADDRESS,
SELF, D, (vir_bytes)&bell, sizeof(bell));
if (r != OK)
break;
ticks= bell.kb_duration.tv_usec * HZ / 1000000;
ticks += bell.kb_duration.tv_sec * HZ;
if (!ticks)
ticks++;
beep_x(bell.kb_pitch, ticks);
r= OK;
break;
}
r= ENOTTY;
break;
default:
printf("Warning, TTY(kbd) got unexpected request %d from %d\n",
m->m_type, m->m_source);
r= EINVAL;
}
tty_reply(TASK_REPLY, m->m_source, m->IO_ENDPT, r);
}
/*===========================================================================*
* handle_status *
*===========================================================================*/
PRIVATE int handle_status(kbdp, m)
struct kbd *kbdp;
message *m;
{
int n, r;
if (kbdp->avail && kbdp->req_size && m->m_source == kbdp->incaller)
{
/* Handle read request */
n= kbdp->avail;
if (n > kbdp->req_size)
n= kbdp->req_size;
if (kbdp->offset + n > KBD_BUFSZ)
n= KBD_BUFSZ-kbdp->offset;
if (n <= 0)
panic("TTY", "kbd_status: bad n", n);
kbdp->req_size= 0;
r= sys_vircopy(SELF, D, (vir_bytes)&kbdp->buf[kbdp->offset],
kbdp->req_proc, D, kbdp->req_addr, n);
if (r == OK)
{
kbdp->offset= (kbdp->offset+n) % KBD_BUFSZ;
kbdp->avail -= n;
r= n;
}
m->m_type = DEV_REVIVE;
m->REP_ENDPT= kbdp->req_proc;
m->REP_STATUS= r;
return 1;
}
if (kbdp->avail && (kbdp->select_ops & SEL_RD) &&
m->m_source == kbdp->select_proc)
{
m->m_type = DEV_IO_READY;
m->DEV_MINOR = kbdp->minor;
m->DEV_SEL_OPS = SEL_RD;
kbdp->select_ops &= ~SEL_RD;
return 1;
}
return 0;
}
/*===========================================================================*
* map_key0 *
*===========================================================================*/
/* Map a scan code to an ASCII code ignoring modifiers. */
#define map_key0(scode) \
((unsigned) keymap[(scode) * MAP_COLS])
/*===========================================================================*
* map_key *
*===========================================================================*/
PRIVATE unsigned map_key(scode)
int scode;
{
/* Map a scan code to an ASCII code. */
int caps, column, lk;
u16_t *keyrow;
if (scode == SLASH_SCAN && esc) return '/'; /* don't map numeric slash */
keyrow = &keymap[scode * MAP_COLS];
caps = shift;
lk = locks[ccurrent];
if ((lk & NUM_LOCK) && HOME_SCAN <= scode && scode <= DEL_SCAN) caps = !caps;
if ((lk & CAPS_LOCK) && (keyrow[0] & HASCAPS)) caps = !caps;
if (alt) {
column = 2;
if (ctrl || alt_r) column = 3; /* Ctrl + Alt == AltGr */
if (caps) column = 4;
} else {
column = 0;
if (caps) column = 1;
if (ctrl) column = 5;
}
return keyrow[column] & ~HASCAPS;
}
/*===========================================================================*
* kbd_interrupt *
*===========================================================================*/
PUBLIC void kbd_interrupt(m_ptr)
message *m_ptr;
{
/* A keyboard interrupt has occurred. Process it. */
int o, isaux;
unsigned char scode;
struct kbd *kbdp;
static timer_t timer; /* timer must be static! */
/* Fetch the character from the keyboard hardware and acknowledge it. */
if (!scan_keyboard(&scode, &isaux))
return;
if (isaux)
kbdp= &kbdaux;
else if (kbd.nr_open && !panicing)
kbdp= &kbd;
else
kbdp= NULL;
if (kbdp)
{
/* raw scan codes or aux data */
if (kbdp->avail >= KBD_BUFSZ)
{
printf("kbd_interrupt: %s buffer is full\n",
isaux ? "kbdaux" : "keyboard");
return; /* Buffer is full */
}
o= (kbdp->offset + kbdp->avail) % KBD_BUFSZ;
kbdp->buf[o]= scode;
kbdp->avail++;
if (kbdp->req_size)
notify(kbdp->incaller);
if (kbdp->select_ops & SEL_RD)
notify(kbdp->select_proc);
return;
}
/* Store the scancode in memory so the task can get at it later. */
if (icount < KB_IN_BYTES) {
*ihead++ = scode;
if (ihead == ibuf + KB_IN_BYTES) ihead = ibuf;
icount++;
tty_table[ccurrent].tty_events = 1;
if (tty_table[ccurrent].tty_select_ops & SEL_RD) {
select_retry(&tty_table[ccurrent]);
}
}
}
/*===========================================================================*
* kb_read *
*===========================================================================*/
PRIVATE int kb_read(tp, try)
tty_t *tp;
int try;
{
/* Process characters from the circular keyboard buffer. */
char buf[3];
int scode;
unsigned ch;
tp = &tty_table[ccurrent]; /* always use the current console */
if (try) {
if (icount > 0) return 1;
return 0;
}
while (icount > 0) {
scode = *itail++; /* take one key scan code */
if (itail == ibuf + KB_IN_BYTES) itail = ibuf;
icount--;
/* Function keys are being used for debug dumps. */
if (func_key(scode)) continue;
/* Perform make/break processing. */
ch = make_break(scode);
if (ch <= 0xFF) {
/* A normal character. */
buf[0] = ch;
(void) in_process(tp, buf, 1);
} else
if (HOME <= ch && ch <= INSRT) {
/* An ASCII escape sequence generated by the numeric pad. */
buf[0] = ESC;
buf[1] = '[';
buf[2] = numpad_map[ch - HOME];
(void) in_process(tp, buf, 3);
} else
if (ch == ALEFT) {
/* Choose lower numbered console as current console. */
select_console(ccurrent - 1);
set_leds();
} else
if (ch == ARIGHT) {
/* Choose higher numbered console as current console. */
select_console(ccurrent + 1);
set_leds();
} else
if (AF1 <= ch && ch <= AF12) {
/* Alt-F1 is console, Alt-F2 is ttyc1, etc. */
select_console(ch - AF1);
set_leds();
} else
if (CF1 <= ch && ch <= CF12) {
switch(ch) {
case CF1: show_key_mappings(); break;
case CF3: toggle_scroll(); break; /* hardware <-> software */
case CF7: sigchar(&tty_table[CONSOLE], SIGQUIT); break;
case CF8: sigchar(&tty_table[CONSOLE], SIGINT); break;
case CF9: sigchar(&tty_table[CONSOLE], SIGKILL); break;
}
}
}
return 1;
}
/*===========================================================================*
* kbd_send *
*===========================================================================*/
PRIVATE void kbd_send()
{
unsigned long sb;
int r;
clock_t now;
if (!kbdout.avail)
return;
if (kbdout.expect_ack)
return;
sys_inb(KB_STATUS, &sb);
if (sb & (KB_OUT_FULL|KB_IN_FULL))
{
printf("not sending 1: sb = 0x%x\n", sb);
return;
}
micro_delay(KBC_IN_DELAY);
sys_inb(KB_STATUS, &sb);
if (sb & (KB_OUT_FULL|KB_IN_FULL))
{
printf("not sending 2: sb = 0x%x\n", sb);
return;
}
/* Okay, buffer is really empty */
#if 0
printf("sending byte 0x%x to keyboard\n", kbdout.buf[kbdout.offset]);
#endif
sys_outb(KEYBD, kbdout.buf[kbdout.offset]);
kbdout.offset++;
kbdout.avail--;
kbdout.expect_ack= 1;
kbd_alive= 1;
if (kbd_watchdog_set)
{
/* Add a timer to the timers list. Possibly reschedule the
* alarm.
*/
if ((r= getuptime(&now)) != OK)
panic("TTY","Keyboard couldn't get clock's uptime.", r);
tmrs_settimer(&tty_timers, &tmr_kbd_wd, now+HZ, kbd_watchdog,
NULL);
if (tty_timers->tmr_exp_time != tty_next_timeout) {
tty_next_timeout = tty_timers->tmr_exp_time;
if ((r= sys_setalarm(tty_next_timeout, 1)) != OK)
panic("TTY","Keyboard couldn't set alarm.", r);
}
kbd_watchdog_set= 1;
}
}
/*===========================================================================*
* make_break *
*===========================================================================*/
PRIVATE unsigned make_break(scode)
int scode; /* scan code of key just struck or released */
{
/* This routine can handle keyboards that interrupt only on key depression,
* as well as keyboards that interrupt on key depression and key release.
* For efficiency, the interrupt routine filters out most key releases.
*/
int ch, make, escape;
static int CAD_count = 0;
/* Check for CTRL-ALT-DEL, and if found, halt the computer. This would
* be better done in keyboard() in case TTY is hung, except control and
* alt are set in the high level code.
*/
if (ctrl && alt && (scode == DEL_SCAN || scode == INS_SCAN))
{
if (++CAD_count == 3) {
cons_stop();
sys_abort(RBT_HALT);
}
sys_kill(INIT_PROC_NR, SIGABRT);
return -1;
}
/* High-order bit set on key release. */
make = (scode & KEY_RELEASE) == 0; /* true if pressed */
ch = map_key(scode &= ASCII_MASK); /* map to ASCII */
escape = esc; /* Key is escaped? (true if added since the XT) */
esc = 0;
switch (ch) {
case CTRL: /* Left or right control key */
*(escape ? &ctrl_r : &ctrl_l) = make;
ctrl = ctrl_l | ctrl_r;
break;
case SHIFT: /* Left or right shift key */
*(scode == RSHIFT_SCAN ? &shift_r : &shift_l) = make;
shift = shift_l | shift_r;
break;
case ALT: /* Left or right alt key */
*(escape ? &alt_r : &alt_l) = make;
alt = alt_l | alt_r;
break;
case CALOCK: /* Caps lock - toggle on 0 -> 1 transition */
if (caps_down < make) {
locks[ccurrent] ^= CAPS_LOCK;
set_leds();
}
caps_down = make;
break;
case NLOCK: /* Num lock */
if (num_down < make) {
locks[ccurrent] ^= NUM_LOCK;
set_leds();
}
num_down = make;
break;
case SLOCK: /* Scroll lock */
if (scroll_down < make) {
locks[ccurrent] ^= SCROLL_LOCK;
set_leds();
}
scroll_down = make;
break;
case EXTKEY: /* Escape keycode */
esc = 1; /* Next key is escaped */
return(-1);
default: /* A normal key */
if (make) return(ch);
}
/* Key release, or a shift type key. */
return(-1);
}
/*===========================================================================*
* set_leds *
*===========================================================================*/
PRIVATE void set_leds()
{
/* Set the LEDs on the caps, num, and scroll lock keys */
int s;
if (! machine.pc_at) return; /* PC/XT doesn't have LEDs */
kb_wait(); /* wait for buffer empty */
if ((s=sys_outb(KEYBD, LED_CODE)) != OK)
printf("Warning, sys_outb couldn't prepare for LED values: %d\n", s);
/* prepare keyboard to accept LED values */
kb_ack(); /* wait for ack response */
kb_wait(); /* wait for buffer empty */
if ((s=sys_outb(KEYBD, locks[ccurrent])) != OK)
printf("Warning, sys_outb couldn't give LED values: %d\n", s);
/* give keyboard LED values */
kb_ack(); /* wait for ack response */
}
/*===========================================================================*
* kbc_cmd0 *
*===========================================================================*/
PRIVATE void kbc_cmd0(cmd)
int cmd;
{
kb_wait();
sys_outb(KB_COMMAND, cmd);
}
/*===========================================================================*
* kbc_cmd1 *
*===========================================================================*/
PRIVATE void kbc_cmd1(cmd, data)
int cmd;
int data;
{
kb_wait();
sys_outb(KB_COMMAND, cmd);
kb_wait();
sys_outb(KEYBD, data);
}
/*===========================================================================*
* kbc_read *
*===========================================================================*/
PRIVATE int kbc_read()
{
int i;
unsigned long byte, st;
#if 0
struct micro_state ms;
#endif
#if DEBUG
printf("in kbc_read\n");
#endif
/* Wait at most 1 second for a byte from the keyboard or
* the kbd controller, return -1 on a timeout.
*/
for (i= 0; i<1000; i++)
#if 0
micro_start(&ms);
do
#endif
{
sys_inb(KB_STATUS, &st);
if (st & KB_OUT_FULL)
{
micro_delay(KBC_IN_DELAY);
sys_inb(KEYBD, &byte);
if (st & KB_AUX_BYTE)
{
#if DEBUG
printf(
"keyboard`kbc_read: ignoring byte (0x%x) from aux device.\n",
byte);
#endif
continue;
}
#if DEBUG
printf("keyboard`kbc_read: returning byte 0x%x\n",
byte);
#endif
return byte;
}
}
#if 0
while (micro_elapsed(&ms) < 1000000);
#endif
panic("TTY", "kbc_read failed to complete", NO_NUM);
}
/*===========================================================================*
* kb_wait *
*===========================================================================*/
PRIVATE int kb_wait()
{
/* Wait until the controller is ready; return zero if this times out. */
int retries;
unsigned long status, temp;
int s, isaux;
unsigned char byte;
retries = MAX_KB_BUSY_RETRIES + 1; /* wait until not busy */
do {
s = sys_inb(KB_STATUS, &status);
if (status & KB_OUT_FULL) {
if (scan_keyboard(&byte, &isaux))
{
#if 0
printf("ignoring %sbyte in kb_wait\n", isaux ? "AUX " : "");
#endif
}
}
if (! (status & (KB_IN_FULL|KB_OUT_FULL)) )
break; /* wait until ready */
} while (--retries != 0); /* continue unless timeout */
return(retries); /* zero on timeout, positive if ready */
}
/*===========================================================================*
* kb_ack *
*===========================================================================*/
PRIVATE int kb_ack()
{
/* Wait until kbd acknowledges last command; return zero if this times out. */
int retries, s;
unsigned long u8val;
retries = MAX_KB_ACK_RETRIES + 1;
do {
s = sys_inb(KEYBD, &u8val);
if (u8val == KB_ACK)
break; /* wait for ack */
} while(--retries != 0); /* continue unless timeout */
return(retries); /* nonzero if ack received */
}
/*===========================================================================*
* kb_init *
*===========================================================================*/
PUBLIC void kb_init(tp)
tty_t *tp;
{
/* Initialize the keyboard driver. */
tp->tty_devread = kb_read; /* input function */
}
/*===========================================================================*
* kb_init_once *
*===========================================================================*/
PUBLIC void kb_init_once(void)
{
int i;
u8_t ccb;
set_leds(); /* turn off numlock led */
scan_keyboard(NULL, NULL); /* discard leftover keystroke */
/* Clear the function key observers array. Also see func_key(). */
for (i=0; i<12; i++) {
fkey_obs[i].proc_nr = NONE; /* F1-F12 observers */
fkey_obs[i].events = 0; /* F1-F12 observers */
sfkey_obs[i].proc_nr = NONE; /* Shift F1-F12 observers */
sfkey_obs[i].events = 0; /* Shift F1-F12 observers */
}
kbd.minor= KBD_MINOR;
kbdaux.minor= KBDAUX_MINOR;
/* Set interrupt handler and enable keyboard IRQ. */
irq_hook_id = KEYBOARD_IRQ; /* id to be returned on interrupt */
if ((i=sys_irqsetpolicy(KEYBOARD_IRQ, IRQ_REENABLE, &irq_hook_id)) != OK)
panic("TTY", "Couldn't set keyboard IRQ policy", i);
if ((i=sys_irqenable(&irq_hook_id)) != OK)
panic("TTY", "Couldn't enable keyboard IRQs", i);
kbd_irq_set |= (1 << KEYBOARD_IRQ);
/* Set AUX interrupt handler and enable AUX IRQ. */
aux_irq_hook_id = KBD_AUX_IRQ; /* id to be returned on interrupt */
if ((i=sys_irqsetpolicy(KBD_AUX_IRQ, IRQ_REENABLE,
&aux_irq_hook_id)) != OK)
panic("TTY", "Couldn't set AUX IRQ policy", i);
if ((i=sys_irqenable(&aux_irq_hook_id)) != OK)
panic("TTY", "Couldn't enable AUX IRQs", i);
kbd_irq_set |= (1 << KBD_AUX_IRQ);
/* Disable the keyboard and aux */
kbc_cmd0(KBC_DI_KBD);
kbc_cmd0(KBC_DI_AUX);
/* Get the current configuration byte */
kbc_cmd0(KBC_RD_RAM_CCB);
ccb= kbc_read();
/* Enable both interrupts. */
kbc_cmd1(KBC_WR_RAM_CCB, ccb | 3);
/* Re-enable the keyboard device. */
kbc_cmd0(KBC_EN_KBD);
/* Enable the aux device. */
kbc_cmd0(KBC_EN_AUX);
}
/*===========================================================================*
* kbd_loadmap *
*===========================================================================*/
PUBLIC int kbd_loadmap(m)
message *m;
{
/* Load a new keymap. */
int result;
result = sys_vircopy(m->IO_ENDPT, D, (vir_bytes) m->ADDRESS,
SELF, D, (vir_bytes) keymap,
(vir_bytes) sizeof(keymap));
return(result);
}
/*===========================================================================*
* do_fkey_ctl *
*===========================================================================*/
PUBLIC void do_fkey_ctl(m_ptr)
message *m_ptr; /* pointer to the request message */
{
/* This procedure allows processes to register a function key to receive
* notifications if it is pressed. At most one binding per key can exist.
*/
int i;
int result;
switch (m_ptr->FKEY_REQUEST) { /* see what we must do */
case FKEY_MAP: /* request for new mapping */
result = OK; /* assume everything will be ok*/
for (i=0; i < 12; i++) { /* check F1-F12 keys */
if (bit_isset(m_ptr->FKEY_FKEYS, i+1) ) {
#if DEAD_CODE
/* Currently, we don't check if the slot is in use, so that IS
* can recover after a crash by overtaking its existing mappings.
* In future, a better solution will be implemented.
*/
if (fkey_obs[i].proc_nr == NONE) {
#endif
fkey_obs[i].proc_nr = m_ptr->m_source;
fkey_obs[i].events = 0;
bit_unset(m_ptr->FKEY_FKEYS, i+1);
#if DEAD_CODE
} else {
printf("WARNING, fkey_map failed F%d\n", i+1);
result = EBUSY; /* report failure, but try rest */
}
#endif
}
}
for (i=0; i < 12; i++) { /* check Shift+F1-F12 keys */
if (bit_isset(m_ptr->FKEY_SFKEYS, i+1) ) {
#if DEAD_CODE
if (sfkey_obs[i].proc_nr == NONE) {
#endif
sfkey_obs[i].proc_nr = m_ptr->m_source;
sfkey_obs[i].events = 0;
bit_unset(m_ptr->FKEY_SFKEYS, i+1);
#if DEAD_CODE
} else {
printf("WARNING, fkey_map failed Shift F%d\n", i+1);
result = EBUSY; /* report failure but try rest */
}
#endif
}
}
break;
case FKEY_UNMAP:
result = OK; /* assume everything will be ok*/
for (i=0; i < 12; i++) { /* check F1-F12 keys */
if (bit_isset(m_ptr->FKEY_FKEYS, i+1) ) {
if (fkey_obs[i].proc_nr == m_ptr->m_source) {
fkey_obs[i].proc_nr = NONE;
fkey_obs[i].events = 0;
bit_unset(m_ptr->FKEY_FKEYS, i+1);
} else {
result = EPERM; /* report failure, but try rest */
}
}
}
for (i=0; i < 12; i++) { /* check Shift+F1-F12 keys */
if (bit_isset(m_ptr->FKEY_SFKEYS, i+1) ) {
if (sfkey_obs[i].proc_nr == m_ptr->m_source) {
sfkey_obs[i].proc_nr = NONE;
sfkey_obs[i].events = 0;
bit_unset(m_ptr->FKEY_SFKEYS, i+1);
} else {
result = EPERM; /* report failure, but try rest */
}
}
}
break;
case FKEY_EVENTS:
m_ptr->FKEY_FKEYS = m_ptr->FKEY_SFKEYS = 0;
for (i=0; i < 12; i++) { /* check (Shift+) F1-F12 keys */
if (fkey_obs[i].proc_nr == m_ptr->m_source) {
if (fkey_obs[i].events) {
bit_set(m_ptr->FKEY_FKEYS, i+1);
fkey_obs[i].events = 0;
}
}
if (sfkey_obs[i].proc_nr == m_ptr->m_source) {
if (sfkey_obs[i].events) {
bit_set(m_ptr->FKEY_SFKEYS, i+1);
sfkey_obs[i].events = 0;
}
}
}
break;
default:
result = EINVAL; /* key cannot be observed */
}
/* Almost done, return result to caller. */
m_ptr->m_type = result;
send(m_ptr->m_source, m_ptr);
}
/*===========================================================================*
* func_key *
*===========================================================================*/
PRIVATE int func_key(scode)
int scode; /* scan code for a function key */
{
/* This procedure traps function keys for debugging purposes. Observers of
* function keys are kept in a global array. If a subject (a key) is pressed
* the observer is notified of the event. Initialization of the arrays is done
* in kb_init, where NONE is set to indicate there is no interest in the key.
* Returns FALSE on a key release or if the key is not observable.
*/
message m;
int key;
int proc_nr;
int i,s;
/* Ignore key releases. If this is a key press, get full key code. */
if (scode & KEY_RELEASE) return(FALSE); /* key release */
key = map_key(scode); /* include modifiers */
/* Key pressed, now see if there is an observer for the pressed key.
* F1-F12 observers are in fkey_obs array.
* SHIFT F1-F12 observers are in sfkey_req array.
* CTRL F1-F12 reserved (see kb_read)
* ALT F1-F12 reserved (see kb_read)
* Other combinations are not in use. Note that Alt+Shift+F1-F12 is yet
* defined in <minix/keymap.h>, and thus is easy for future extensions.
*/
if (F1 <= key && key <= F12) { /* F1-F12 */
proc_nr = fkey_obs[key - F1].proc_nr;
fkey_obs[key - F1].events ++ ;
} else if (SF1 <= key && key <= SF12) { /* Shift F2-F12 */
proc_nr = sfkey_obs[key - SF1].proc_nr;
sfkey_obs[key - SF1].events ++;
}
else {
return(FALSE); /* not observable */
}
/* See if an observer is registered and send it a message. */
if (proc_nr != NONE) {
m.NOTIFY_TYPE = FKEY_PRESSED;
notify(proc_nr);
}
return(TRUE);
}
/*===========================================================================*
* show_key_mappings *
*===========================================================================*/
PRIVATE void show_key_mappings()
{
int i,s;
struct proc proc;
printf("\n");
printf("System information. Known function key mappings to request debug dumps:\n");
printf("-------------------------------------------------------------------------\n");
for (i=0; i<12; i++) {
printf(" %sF%d: ", i+1<10? " ":"", i+1);
if (fkey_obs[i].proc_nr != NONE) {
if ((s=sys_getproc(&proc, fkey_obs[i].proc_nr))!=OK)
printf("sys_getproc: %d\n", s);
printf("%-14.14s", proc.p_name);
} else {
printf("%-14.14s", "<none>");
}
printf(" %sShift-F%d: ", i+1<10? " ":"", i+1);
if (sfkey_obs[i].proc_nr != NONE) {
if ((s=sys_getproc(&proc, sfkey_obs[i].proc_nr))!=OK)
printf("sys_getproc: %d\n", s);
printf("%-14.14s", proc.p_name);
} else {
printf("%-14.14s", "<none>");
}
printf("\n");
}
printf("\n");
printf("Press one of the registered function keys to trigger a debug dump.\n");
printf("\n");
}
/*===========================================================================*
* scan_keyboard *
*===========================================================================*/
PRIVATE int scan_keyboard(bp, isauxp)
unsigned char *bp;
int *isauxp;
{
#if 0 /* Is this old XT code? It doesn't match the PS/2 hardware */
/* Fetch the character from the keyboard hardware and acknowledge it. */
pvb_pair_t byte_in[2], byte_out[2];
byte_in[0].port = KEYBD; /* get the scan code for the key struck */
byte_in[1].port = PORT_B; /* strobe the keyboard to ack the char */
sys_vinb(byte_in, 2); /* request actual input */
pv_set(byte_out[0], PORT_B, byte_in[1].value | KBIT); /* strobe bit high */
pv_set(byte_out[1], PORT_B, byte_in[1].value); /* then strobe low */
sys_voutb(byte_out, 2); /* request actual output */
return(byte_in[0].value); /* return scan code */
#else
unsigned long b, sb;
sys_inb(KB_STATUS, &sb);
if (!(sb & KB_OUT_FULL))
{
if (kbdout.avail && !kbdout.expect_ack)
kbd_send();
return 0;
}
sys_inb(KEYBD, &b);
#if 0
printf("got byte 0x%x from %s\n", b, (sb & KB_AUX_BYTE) ? "AUX" : "keyboard");
#endif
if (!(sb & KB_AUX_BYTE) && b == KB_ACK && kbdout.expect_ack)
{
#if 1
printf("got ACK from keyboard\n");
#endif
kbdout.expect_ack= 0;
micro_delay(KBC_IN_DELAY);
kbd_send();
return 0;
}
if (bp)
*bp= b;
if (isauxp)
*isauxp= !!(sb & KB_AUX_BYTE);
if (kbdout.avail && !kbdout.expect_ack)
{
micro_delay(KBC_IN_DELAY);
kbd_send();
}
return 1;
#endif
}
static void micro_delay(unsigned long usecs)
{
tickdelay(MICROS_TO_TICKS(usecs));
}
/*===========================================================================*
* kbd_watchdog *
*===========================================================================*/
PRIVATE void kbd_watchdog(tmrp)
timer_t *tmrp;
{
int r;
clock_t now;
kbd_watchdog_set= 0;
if (!kbdout.avail)
return; /* Watchdog is no longer needed */
if (!kbd_alive)
{
printf("kbd_watchdog: should reset keyboard\n");
}
kbd_alive= 0;
if ((r= getuptime(&now)) != OK)
panic("TTY","Keyboard couldn't get clock's uptime.", r);
tmrs_settimer(&tty_timers, &tmr_kbd_wd, now+HZ, kbd_watchdog,
NULL);
if (tty_timers->tmr_exp_time != tty_next_timeout) {
tty_next_timeout = tty_timers->tmr_exp_time;
if ((r= sys_setalarm(tty_next_timeout, 1)) != OK)
panic("TTY","Keyboard couldn't set alarm.", r);
}
kbd_watchdog_set= 1;
}
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