ref: 9f76a7f6819ac04552b4fb6588156f3e4089d1d7
dir: /os/pc/kbd.c/
#include "u.h"
#include "../port/lib.h"
#include "mem.h"
#include "dat.h"
#include "fns.h"
#include "io.h"
#include "../port/error.h"
enum {
Data= 0x60, /* data port */
Status= 0x64, /* status port */
Inready= 0x01, /* input character ready */
Outbusy= 0x02, /* output busy */
Sysflag= 0x04, /* system flag */
Cmddata= 0x08, /* cmd==0, data==1 */
Inhibit= 0x10, /* keyboard/mouse inhibited */
Minready= 0x20, /* mouse character ready */
Rtimeout= 0x40, /* general timeout */
Parity= 0x80,
Cmd= 0x64, /* command port (write only) */
Spec= 0x80,
PF= Spec|0x20, /* num pad function key */
View= Spec|0x00, /* view (shift window up) */
KF= 0xF000, /* function key (begin Unicode private space) */
Shift= Spec|0x60,
Break= Spec|0x61,
Ctrl= Spec|0x62,
Latin= Spec|0x63,
Caps= Spec|0x64,
Num= Spec|0x65,
Middle= Spec|0x66,
No= 0x00, /* peter */
Home= KF|13,
Up= KF|14,
Pgup= KF|15,
Print= KF|16,
Left= KF|17,
Right= KF|18,
End= '\r',
Down= View,
Pgdown= KF|19,
Ins= KF|20,
Del= 0x7F,
Scroll= KF|21,
};
/*
* The codes at 0x79 and 0x81 are produed by the PFU Happy Hacking keyboard.
* A 'standard' keyboard doesn't produce anything above 0x58.
*/
Rune kbtab[] =
{
[0x00] No, 0x1b, '1', '2', '3', '4', '5', '6',
[0x08] '7', '8', '9', '0', '-', '=', '\b', '\t',
[0x10] 'q', 'w', 'e', 'r', 't', 'y', 'u', 'i',
[0x18] 'o', 'p', '[', ']', '\n', Ctrl, 'a', 's',
[0x20] 'd', 'f', 'g', 'h', 'j', 'k', 'l', ';',
[0x28] '\'', '`', Shift, '\\', 'z', 'x', 'c', 'v',
[0x30] 'b', 'n', 'm', ',', '.', '/', Shift, '*',
[0x38] Latin, ' ', Ctrl, KF|1, KF|2, KF|3, KF|4, KF|5,
[0x40] KF|6, KF|7, KF|8, KF|9, KF|10, Num, Scroll, '7',
[0x48] '8', '9', '-', '4', '5', '6', '+', '1',
[0x50] '2', '3', '0', '.', No, No, No, KF|11,
[0x58] KF|12, No, No, No, No, No, No, No,
[0x60] No, No, No, No, No, No, No, No,
[0x68] No, No, No, No, No, No, No, No,
[0x70] No, No, No, No, No, No, No, No,
[0x78] No, View, No, Up, No, No, No, No,
};
Rune kbtabshift[] =
{
[0x00] No, 0x1b, '!', '@', '#', '$', '%', '^',
[0x08] '&', '*', '(', ')', '_', '+', '\b', '\t',
[0x10] 'Q', 'W', 'E', 'R', 'T', 'Y', 'U', 'I',
[0x18] 'O', 'P', '{', '}', '\n', Ctrl, 'A', 'S',
[0x20] 'D', 'F', 'G', 'H', 'J', 'K', 'L', ':',
[0x28] '"', '~', Shift, '|', 'Z', 'X', 'C', 'V',
[0x30] 'B', 'N', 'M', '<', '>', '?', Shift, '*',
[0x38] Latin, ' ', Ctrl, KF|1, KF|2, KF|3, KF|4, KF|5,
[0x40] KF|6, KF|7, KF|8, KF|9, KF|10, Num, Scroll, '7',
[0x48] '8', '9', '-', '4', '5', '6', '+', '1',
[0x50] '2', '3', '0', '.', No, No, No, KF|11,
[0x58] KF|12, No, No, No, No, No, No, No,
[0x60] No, No, No, No, No, No, No, No,
[0x68] No, No, No, No, No, No, No, No,
[0x70] No, No, No, No, No, No, No, No,
[0x78] No, Up, No, Up, No, No, No, No,
};
Rune kbtabesc1[] =
{
[0x00] No, No, No, No, No, No, No, No,
[0x08] No, No, No, No, No, No, No, No,
[0x10] No, No, No, No, No, No, No, No,
[0x18] No, No, No, No, '\n', Ctrl, No, No,
[0x20] No, No, No, No, No, No, No, No,
[0x28] No, No, Shift, No, No, No, No, No,
[0x30] No, No, No, No, No, '/', No, Print,
[0x38] Latin, No, No, No, No, No, No, No,
[0x40] No, No, No, No, No, No, Break, Home,
[0x48] Up, Pgup, No, Left, No, Right, No, End,
[0x50] Down, Pgdown, Ins, Del, No, No, No, No,
[0x58] No, No, No, No, No, No, No, No,
[0x60] No, No, No, No, No, No, No, No,
[0x68] No, No, No, No, No, No, No, No,
[0x70] No, No, No, No, No, No, No, No,
[0x78] No, Up, No, No, No, No, No, No,
};
enum
{
/* controller command byte */
Cscs1= (1<<6), /* scan code set 1 */
Cauxdis= (1<<5), /* mouse disable */
Ckbddis= (1<<4), /* kbd disable */
Csf= (1<<2), /* system flag */
Cauxint= (1<<1), /* mouse interrupt enable */
Ckbdint= (1<<0), /* kbd interrupt enable */
};
int mouseshifted;
static Lock i8042lock;
static uchar ccc;
static void (*auxputc)(int, int);
/*
* wait for output no longer busy
*/
static int
outready(void)
{
int tries;
for(tries = 0; (inb(Status) & Outbusy); tries++){
if(tries > 500)
return -1;
delay(2);
}
return 0;
}
/*
* wait for input
*/
static int
inready(void)
{
int tries;
for(tries = 0; !(inb(Status) & Inready); tries++){
if(tries > 500)
return -1;
delay(2);
}
return 0;
}
/*
* ask 8042 to reset the machine
*/
void
i8042reset(void)
{
ushort *s = KADDR(0x472);
int i, x;
*s = 0x1234; /* BIOS warm-boot flag */
/*
* newer reset the machine command
*/
outready();
outb(Cmd, 0xFE);
outready();
/*
* Pulse it by hand (old somewhat reliable)
*/
x = 0xDF;
for(i = 0; i < 5; i++){
x ^= 1;
outready();
outb(Cmd, 0xD1);
outready();
outb(Data, x); /* toggle reset */
delay(100);
}
}
int
i8042auxcmd(int cmd)
{
unsigned int c;
int tries;
c = 0;
tries = 0;
ilock(&i8042lock);
do{
if(tries++ > 2)
break;
if(outready() < 0)
break;
outb(Cmd, 0xD4);
if(outready() < 0)
break;
outb(Data, cmd);
if(outready() < 0)
break;
if(inready() < 0)
break;
c = inb(Data);
} while(c == 0xFE || c == 0);
iunlock(&i8042lock);
if(c != 0xFA){
print("i8042: %2.2ux returned to the %2.2ux command\n", c, cmd);
return -1;
}
return 0;
}
int
i8042auxcmds(uchar *cmd, int ncmd)
{
int i;
ilock(&i8042lock);
for(i=0; i<ncmd; i++){
if(outready() < 0)
break;
outb(Cmd, 0xD4);
if(outready() < 0)
break;
outb(Data, cmd[i]);
}
iunlock(&i8042lock);
return i;
}
/*
* keyboard interrupt
*/
static void
i8042intr(Ureg*, void*)
{
int s, c, i;
static int esc1, esc2;
static int alt, caps, ctl, num, shift;
static int collecting, nk;
static Rune kc[5];
int keyup;
/*
* get status
*/
lock(&i8042lock);
s = inb(Status);
if(!(s&Inready)){
unlock(&i8042lock);
return;
}
/*
* get the character
*/
c = inb(Data);
unlock(&i8042lock);
/*
* if it's the aux port...
*/
if(s & Minready){
if(auxputc != nil)
auxputc(c, shift);
return;
}
/*
* e0's is the first of a 2 character sequence
*/
if(c == 0xe0){
esc1 = 1;
return;
} else if(c == 0xe1){
esc2 = 2;
return;
}
keyup = c&0x80;
c &= 0x7f;
if(c > sizeof kbtab){
c |= keyup;
if(c != 0xFF) /* these come fairly often: CAPSLOCK U Y */
print("unknown key %ux\n", c);
return;
}
if(esc1){
c = kbtabesc1[c];
esc1 = 0;
} else if(esc2){
esc2--;
return;
} else if(shift)
c = kbtabshift[c];
else
c = kbtab[c];
if(caps && c<='z' && c>='a')
c += 'A' - 'a';
/*
* keyup only important for shifts
*/
if(keyup){
switch(c){
case Latin:
alt = 0;
break;
case Shift:
shift = 0;
mouseshifted = 0;
break;
case Ctrl:
ctl = 0;
break;
}
return;
}
/*
* normal character
*/
if(!(c & (Spec|KF))){
if(ctl){
if(alt && c == Del)
exit(0);
c &= 0x1f;
}
if(!collecting){
kbdputc(kbdq, c);
return;
}
kc[nk++] = c;
c = latin1(kc, nk);
if(c < -1) /* need more keystrokes */
return;
if(c != -1) /* valid sequence */
kbdputc(kbdq, c);
else /* dump characters */
for(i=0; i<nk; i++)
kbdputc(kbdq, kc[i]);
nk = 0;
collecting = 0;
return;
} else {
switch(c){
case Caps:
caps ^= 1;
return;
case Num:
num ^= 1;
return;
case Shift:
shift = 1;
mouseshifted = 1;
return;
case Latin:
alt = 1;
/*
* VMware uses Ctl-Alt as the key combination
* to make the VM give up keyboard and mouse focus.
* This has the unfortunate side effect that when you
* come back into focus, Plan 9 thinks you want to type
* a compose sequence (you just typed alt).
*
* As a clumsy hack around this, we look for ctl-alt
* and don't treat it as the start of a compose sequence.
*/
if(!ctl){
collecting = 1;
nk = 0;
}
return;
case Ctrl:
collecting = 0;
nk = 0;
ctl = 1;
return;
}
}
kbdputc(kbdq, c);
}
void
i8042auxenable(void (*putc)(int, int))
{
char *err = "i8042: aux init failed\n";
/* enable kbd/aux xfers and interrupts */
ccc &= ~Cauxdis;
ccc |= Cauxint;
ilock(&i8042lock);
if(outready() < 0)
print(err);
outb(Cmd, 0x60); /* write control register */
if(outready() < 0)
print(err);
outb(Data, ccc);
if(outready() < 0)
print(err);
outb(Cmd, 0xA8); /* auxilliary device enable */
if(outready() < 0){
iunlock(&i8042lock);
return;
}
auxputc = putc;
intrenable(IrqAUX, i8042intr, 0, BUSUNKNOWN, "kbdaux");
iunlock(&i8042lock);
}
void
kbdinit(void)
{
int c;
/* wait for a quiescent controller */
while((c = inb(Status)) & (Outbusy | Inready))
if(c & Inready)
inb(Data);
/* get current controller command byte */
outb(Cmd, 0x20);
if(inready() < 0){
print("kbdinit: can't read ccc\n");
ccc = 0;
} else
ccc = inb(Data);
/* enable kbd xfers and interrupts */
/* disable mouse */
ccc &= ~Ckbddis;
ccc |= Csf | Ckbdint | Cscs1;
if(outready() < 0)
print("kbd init failed\n");
outb(Cmd, 0x60);
if(outready() < 0)
print("kbd init failed\n");
outb(Data, ccc);
outready();
}
void
kbdenable(void)
{
if(kbdq == nil){
kbdq = qopen(4*1024, 0, 0, 0);
if(kbdq == nil)
panic("kbdinit");
qnoblock(kbdq, 1);
}
ioalloc(Data, 1, 0, "kbd");
ioalloc(Cmd, 1, 0, "kbd");
intrenable(IrqKBD, i8042intr, 0, BUSUNKNOWN, "kbd");
}