static void uartclose(Chan *c) { Uart *p; if(c->qid.type & QTDIR) return; if((c->flag & COPEN) == 0) return; switch(NETTYPE(c->qid.path)){ case Ndataqid: case Nctlqid: p = uart[NETID(c->qid.path)]; qlock(p); if(--(p->opens) == 0){ qclose(p->iq); ilock(&p->rlock); p->ir = p->iw = p->istage; iunlock(&p->rlock); /* */ qhangup(p->oq, nil); if(!waserror()){ uartdrainoutput(p); poperror(); } qclose(p->oq); uartdisable(p); p->dcd = p->dsr = p->dohup = 0; } qunlock(p); break; } }
int uartctl(Uart *p, char *cmd) { char *f[16]; int i, n, nf; nf = tokenize(cmd, f, nelem(f)); for(i = 0; i < nf; i++){ if(strncmp(f[i], "break", 5) == 0){ (*p->phys->dobreak)(p, 0); continue; } n = atoi(f[i]+1); switch(*f[i]){ case 'B': case 'b': uartdrainoutput(p); if((*p->phys->baud)(p, n) < 0) return -1; break; case 'C': case 'c': p->hup_dcd = n; break; case 'D': case 'd': uartdrainoutput(p); (*p->phys->dtr)(p, n); break; case 'E': case 'e': p->hup_dsr = n; break; case 'F': case 'f': if(p->oq != nil) qflush(p->oq); break; case 'H': case 'h': if(p->iq != nil) qhangup(p->iq, 0); if(p->oq != nil) qhangup(p->oq, 0); break; case 'I': case 'i': uartdrainoutput(p); (*p->phys->fifo)(p, n); break; case 'K': case 'k': uartdrainoutput(p); (*p->phys->dobreak)(p, n); break; case 'L': case 'l': uartdrainoutput(p); if((*p->phys->bits)(p, n) < 0) return -1; break; case 'M': case 'm': uartdrainoutput(p); (*p->phys->modemctl)(p, n); break; case 'N': case 'n': if(p->oq != nil) qnoblock(p->oq, n); break; case 'P': case 'p': uartdrainoutput(p); if((*p->phys->parity)(p, *(f[i]+1)) < 0) return -1; break; case 'Q': case 'q': if(p->iq != nil) qsetlimit(p->iq, n); if(p->oq != nil) qsetlimit(p->oq, n); break; case 'R': case 'r': uartdrainoutput(p); (*p->phys->rts)(p, n); break; case 'S': case 's': uartdrainoutput(p); if((*p->phys->stop)(p, n) < 0) return -1; break; case 'W': case 'w': if(uarttimer == nil || n < 1) return -1; uarttimer->tns = (int64_t)n * 100000LL; break; case 'X': case 'x': if(p->enabled){ ilock(&p->tlock); p->xonoff = n; iunlock(&p->tlock); } break; } } return 0; }