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minix/drivers/tty/keyboard.c
Jorrit Herder ec24a0798c Updated function key mapping because of possible changes to NOTIFY. 
The TTY driver now only notifies the IS server about function key event,
but does not tell which keys are pressed. The IS servers queries the TTY
driver to find out about this.
2005-06-20 14:23:31 +00:00

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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/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/type.h"
#include "../../kernel/proc.h"
int 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_OUT_FULL 0x01 /* status bit set when keypress char pending */
#define KB_IN_FULL 0x02 /* status bit set when not ready to receive */
#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 */
/* 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 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 */
FORWARD _PROTOTYPE( int kb_ack, (void) );
FORWARD _PROTOTYPE( int kb_wait, (void) );
FORWARD _PROTOTYPE( int func_key, (int scode) );
FORWARD _PROTOTYPE( int scan_keyboard, (void) );
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) );
/*===========================================================================*
* 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_hw_int *
*===========================================================================*/
PUBLIC void do_interrupt(m_ptr)
message *m_ptr;
{
/* A keyboard interrupt has occurred. Process it. */
int scode;
static timer_t timer; /* timer must be static! */
/* Fetch the character from the keyboard hardware and acknowledge it. */
scode = scan_keyboard();
/* 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) {
printf("tty: kb: try: %d icount: %d\n", try, icount);
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;
}
/*===========================================================================*
* 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) 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 */
}
/*==========================================================================*
* kb_wait *
*==========================================================================*/
PRIVATE int kb_wait()
{
/* Wait until the controller is ready; return zero if this times out. */
int retries, status, temp;
int s;
retries = MAX_KB_BUSY_RETRIES + 1; /* wait until not busy */
do {
s = sys_inb(KB_STATUS, &status);
if (status & KB_OUT_FULL) {
s = sys_inb(KEYBD, &temp); /* discard value */
}
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;
u8_t 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. */
static int count = 0;
int i;
tp->tty_devread = kb_read; /* input function */
set_leds(); /* turn off numlock led */
scan_keyboard(); /* discard leftover keystroke */
/* The following initialization should only run once. */
if (! count ++) {
/* 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 */
}
/* Set interrupt handler and enable keyboard IRQ. */
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_loadmap *
*===========================================================================*/
PUBLIC int kbd_loadmap(m)
message *m;
{
/* Load a new keymap. */
int result;
result = sys_vircopy(m->PROC_NR, 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 */
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 == NONE) {
fkey_obs[i].proc_nr = m_ptr->m_source;
fkey_obs[i].events = 0;
bit_unset(m_ptr->FKEY_FKEYS, i+1);
} else {
printf("WARNING, fkey_map failed F%d\n", i);
result = EBUSY;
break;
}
}
}
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 == NONE) {
sfkey_obs[i].proc_nr = m_ptr->m_source;
sfkey_obs[i].events = 0;
bit_unset(m_ptr->FKEY_SFKEYS, i+1);
} else {
printf("WARNING, fkey_map failed Shift F%d\n", i);
result = EBUSY;
break;
}
}
}
result = OK; /* done, new observer registered */
break;
case FKEY_UNMAP:
result = ENOSYS; /* not yet supported (not needed) */
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, &m);
}
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()
{
/* 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 */
}
/*==========================================================================*
* do_panic_dumps *
*==========================================================================*/
PUBLIC void do_panic_dumps(m)
message *m; /* request message to TTY */
{
/* Wait for keystrokes for printing debugging info and reboot. */
int quiet, code;
/* A panic! Allow debug dumps until user wants to shutdown. */
printf("\nHit ESC to reboot, DEL to shutdown, F-keys for debug dumps\n");
(void) scan_keyboard(); /* ack any old input */
quiet = scan_keyboard();/* quiescent value (0 on PC, last code on AT)*/
for (;;) {
tickdelay(10);
/* See if there are pending request for output, but don't block.
* Diagnostics can span multiple printf()s, so do it in a loop.
*/
while (nb_receive(ANY, m) == OK) {
switch(m->m_type) {
case NEW_KMESS: do_new_kmess(m); break;
case DIAGNOSTICS: do_diagnostics(m); break;
default: ; /* do nothing */
}
tickdelay(1); /* allow more */
}
code = scan_keyboard();
if (code != quiet) {
/* A key has been pressed. */
switch (code) { /* possibly abort MINIX */
case ESC_SCAN: sys_abort(RBT_REBOOT); return;
case DEL_SCAN: sys_abort(RBT_HALT); return;
}
(void) func_key(code); /* check for function key */
quiet = scan_keyboard();
}
}
}
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