ref: b9347940d8f079bbf9f5301dc85a2223bdbaea6e
dir: /kern/devkbd.c/
#include "u.h" #include "lib.h" #include "dat.h" #include "fns.h" #include "error.h" static Queue* keyq; static int kbdinuse; void kbdkey(Rune r, int down) { char buf[2+UTFmax]; if(r == 0) return; if(!kbdinuse || keyq == nil){ if(down) kbdputc(kbdq, r); /* /dev/cons */ return; } memset(buf, 0, sizeof buf); buf[0] = down ? 'r' : 'R'; qproduce(keyq, buf, 2+runetochar(buf+1, &r)); } enum{ Qdir, Qkbd, }; static Dirtab kbddir[]={ ".", {Qdir, 0, QTDIR}, 0, DMDIR|0555, "kbd", {Qkbd}, 0, 0444, }; static void kbdinit(void) { keyq = qopen(4*1024, Qcoalesce, 0, 0); if(keyq == nil) panic("kbdinit"); qnoblock(keyq, 1); } static Chan* kbdattach(char *spec) { return devattach('b', spec); } static Walkqid* kbdwalk(Chan *c, Chan *nc, char **name, int nname) { return devwalk(c, nc, name,nname, kbddir, nelem(kbddir), devgen); } static int kbdstat(Chan *c, uchar *dp, int n) { return devstat(c, dp, n, kbddir, nelem(kbddir), devgen); } static Chan* kbdopen(Chan *c, int omode) { c = devopen(c, omode, kbddir, nelem(kbddir), devgen); switch((ulong)c->qid.path){ case Qkbd: if(kbdinuse){ c->flag &= ~COPEN; error(Einuse); } kbdinuse = 1; break; } return c; } static void kbdclose(Chan *c) { switch((ulong)c->qid.path){ case Qkbd: if(c->flag&COPEN) kbdinuse = 0; break; } } static long kbdread(Chan *c, void *buf, long n, vlong off) { USED(off); if(n <= 0) return n; switch((ulong)c->qid.path){ case Qdir: return devdirread(c, buf, n, kbddir, nelem(kbddir), devgen); case Qkbd: return qread(keyq, buf, n); default: print("kbdread 0x%llux\n", c->qid.path); error(Egreg); } return -1; /* never reached */ } static long kbdwrite(Chan *c, void *va, long n, vlong off) { USED(c); USED(va); USED(n); USED(off); error(Eperm); return -1; /* never reached */ } Dev kbddevtab = { 'b', "kbd", devreset, kbdinit, devshutdown, kbdattach, kbdwalk, kbdstat, kbdopen, devcreate, kbdclose, kbdread, devbread, kbdwrite, devbwrite, devremove, devwstat, };