ref: b0ad72be22c9125e674d53bc7f9c086cd7c1ac83
dir: /sys/src/9/pc/devkbd.c/
/* * keyboard input */ #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) */ }; 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 */ }; enum { Qdir, Qscancode, Qleds, }; static Dirtab kbdtab[] = { ".", {Qdir, 0, QTDIR}, 0, 0555, "scancode", {Qscancode, 0}, 0, 0440, "leds", {Qleds, 0}, 0, 0220, }; static Lock i8042lock; static uchar ccc; static void (*auxputc)(int, int); static int nokbd = 1; /* flag: no PS/2 keyboard */ static struct { Ref ref; Queue *q; } kbd; /* * 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) { int i, x; if(nokbd) return; *((ushort*)KADDR(0x472)) = 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 (pc=%#p)\n", c, cmd, getcallerpc(&cmd)); return -1; } return 0; } /* * set keyboard's leds for lock states (scroll, numeric, caps). * * at least one keyboard (from Qtronics) also sets its numeric-lock * behaviour to match the led state, though it has no numeric keypad, * and some BIOSes bring the system up with numeric-lock set and no * setting to change that. this combination steals the keys for these * characters and makes it impossible to generate them: uiolkjm&*(). * thus we'd like to be able to force the numeric-lock led (and behaviour) off. */ static void setleds(int leds) { static int old = -1; if(nokbd || leds == old) return; leds &= 7; ilock(&i8042lock); for(;;){ if(outready() < 0) break; outb(Data, 0xed); /* `reset keyboard lock states' */ if(outready() < 0) break; outb(Data, leds); if(outready() < 0) break; old = leds; break; } iunlock(&i8042lock); } /* * keyboard interrupt */ static void i8042intr(Ureg*, void*) { int s, c; uchar b; /* * get status */ ilock(&i8042lock); s = inb(Status); if(!(s&Inready)){ iunlock(&i8042lock); return; } /* * get the character */ c = inb(Data); iunlock(&i8042lock); /* * if it's the aux port... */ if(s & Minready){ if(auxputc != nil) auxputc(c, 0); return; } b = c & 0xff; qproduce(kbd.q, &b, 1); } void i8042auxenable(void (*putc)(int, int)) { static char err[] = "i8042: aux init failed\n"; ilock(&i8042lock); /* enable kbd/aux xfers and interrupts */ ccc &= ~Cauxdis; ccc |= Cauxint; 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); /* auxiliary device enable */ if(outready() < 0){ print(err); iunlock(&i8042lock); return; } auxputc = putc; intrenable(IrqAUX, i8042intr, 0, BUSUNKNOWN, "kbdaux"); iunlock(&i8042lock); } static void kbdpoll(void) { if(nokbd || qlen(kbd.q) > 0) return; i8042intr(0, 0); } static void kbdshutdown(void) { if(nokbd) return; /* disable kbd and aux xfers and interrupts */ ccc &= ~(Ckbdint|Cauxint); ccc |= (Cauxdis|Ckbddis); outready(); outb(Cmd, 0x60); outready(); outb(Data, ccc); outready(); } static Chan * kbdattach(char *spec) { return devattach(L'b', spec); } static Walkqid* kbdwalk(Chan *c, Chan *nc, char **name, int nname) { return devwalk(c, nc, name, nname, kbdtab, nelem(kbdtab), devgen); } static int kbdstat(Chan *c, uchar *dp, int n) { return devstat(c, dp, n, kbdtab, nelem(kbdtab), devgen); } static Chan* kbdopen(Chan *c, int omode) { if(!iseve()) error(Eperm); if(c->qid.path == Qscancode){ if(waserror()){ decref(&kbd.ref); nexterror(); } if(incref(&kbd.ref) != 1) error(Einuse); c = devopen(c, omode, kbdtab, nelem(kbdtab), devgen); poperror(); return c; } return devopen(c, omode, kbdtab, nelem(kbdtab), devgen); } static void kbdclose(Chan *c) { if((c->flag & COPEN) && c->qid.path == Qscancode) decref(&kbd.ref); } static Block* kbdbread(Chan *c, long n, ulong off) { if(c->qid.path == Qscancode){ kbdpoll(); return qbread(kbd.q, n); } return devbread(c, n, off); } static long kbdread(Chan *c, void *a, long n, vlong) { if(c->qid.path == Qscancode){ kbdpoll(); return qread(kbd.q, a, n); } if(c->qid.path == Qdir) return devdirread(c, a, n, kbdtab, nelem(kbdtab), devgen); error(Egreg); return 0; } static long kbdwrite(Chan *c, void *a, long n, vlong) { char tmp[8+1], *p; if(c->qid.path != Qleds) error(Egreg); p = tmp + n; if(n >= sizeof(tmp)) p = tmp + sizeof(tmp)-1; memmove(tmp, a, p - tmp); *p = 0; setleds(atoi(tmp)); return n; } static void kbdreset(void) { static char initfailed[] = "i8042: kbd init failed\n"; int c, try; kbd.q = qopen(1024, Qcoalesce, 0, 0); if(kbd.q == nil) panic("kbdreset"); qnoblock(kbd.q, 1); if(getconf("*nokbd")) return; /* wait for a quiescent controller */ try = 1000; while(try-- > 0 && (c = inb(Status)) & (Outbusy | Inready)) { if(c & Inready) inb(Data); delay(1); } if (try <= 0) { print(initfailed); return; } /* get current controller command byte */ outb(Cmd, 0x20); if(inready() < 0){ print("i8042: can't read ccc\n"); ccc = 0; } else ccc = inb(Data); /* enable kbd xfers and interrupts */ ccc &= ~Ckbddis; ccc |= Csf | Ckbdint | Cscs1; /* disable ps2 mouse */ ccc &= ~Cauxint; ccc |= Cauxdis; if(outready() < 0) { print(initfailed); return; } outb(Cmd, 0x60); outready(); outb(Data, ccc); outready(); nokbd = 0; ioalloc(Cmd, 1, 0, "i8042.cs"); ioalloc(Data, 1, 0, "i8042.data"); intrenable(IrqKBD, i8042intr, 0, BUSUNKNOWN, "kbd"); } Dev kbddevtab = { L'b', "kbd", kbdreset, devinit, kbdshutdown, kbdattach, kbdwalk, kbdstat, kbdopen, devcreate, kbdclose, kbdread, kbdbread, kbdwrite, devbwrite, devremove, devwstat, };