1997/0327/pc/devlpt.c (diff list | history)

pc/devlpt.c on 1991/1204
1991/1204		#include "u.h"
1992/0321		#include "../port/lib.h"
1991/1204		#include "mem.h" #include "dat.h" #include "fns.h" #include "io.h"
1992/0111		#include "../port/error.h"
1991/1204		/* Centronix parallel (printer) port */ /* base addresses */
1992/0205		static int lptbase[] = {
1994/0324		0x378, /* lpt1 */ 0x3bc, /* lpt2 */
1991/1204		0x278 /* lpt3 (sic) */ }; #define NDEV (sizeof lptbase/sizeof lptbase[0]) /* offsets, and bits in the registers */ enum { /* data latch register */ Qdlr= 0x0, /* printer status register */ Qpsr= 0x1, Fnotbusy= 0x80, Fack= 0x40, Fpe= 0x20, Fselect= 0x10, Fnoerror= 0x08, /* printer control register */ Qpcr= 0x2, Fie= 0x10, Fselectin= 0x08, Finitbar= 0x04, Faf= 0x02, Fstrobe= 0x01, /* fake `data register' */ Qdata= 0x3, }; static int lptready(void*); static void outch(int, int);
1994/0324		static void lptintr(Ureg*, void*);
1991/1204		static Rendez lptrendez; Dirtab lptdir[]={ "dlr", {Qdlr}, 1, 0666, "psr", {Qpsr}, 5, 0444, "pcr", {Qpcr}, 0, 0222, "data", {Qdata}, 0, 0222, }; static int lptgen(Chan *c, Dirtab *tab, int ntab, int i, Dir *dp) { Qid qid; char name[NAMELEN]; if(tab==0 || i>=ntab) return -1; tab += i; qid = tab->qid; if(qid.path < Qdata) qid.path += lptbase[c->dev]; qid.vers = c->dev; sprint(name, "lpt%d%s", c->dev+1, tab->name); devdir(c, qid, name, tab->length, eve, tab->perm, dp); return 1; }
1997/0327		static Chan*
1991/1204		lptattach(char *spec) { Chan *c; int i = (spec && *spec) ? strtol(spec, 0, 0) : 1;
1993/0224		static int set;
1991/1204
1993/0224		if(!set){
1994/0513		outb(lptbase[i-1]+Qpcr, 0); /* turn off interrupts */
1993/0224		set = 1;
1997/0327		intrenable(VectorLPT, lptintr, 0, BUSUNKNOWN);
1993/0224		}
1991/1204		if(i < 1 || i > NDEV)
1992/0114		error(Ebadarg);
1991/1204		c = devattach('L', spec); c->dev = i-1; return c; }
1997/0327		static int
1991/1204		lptwalk(Chan *c, char *name) {
1997/0327		return devwalk(c, name, lptdir, nelem(lptdir), lptgen);
1991/1204		}
1997/0327		static void
1991/1204		lptstat(Chan *c, char *dp) {
1997/0327		devstat(c, dp, lptdir, nelem(lptdir), lptgen);
1991/1204		}
1997/0327		static Chan*
1991/1204		lptopen(Chan *c, int omode) {
1997/0327		return devopen(c, omode, lptdir, nelem(lptdir), lptgen);
1991/1204		}
1997/0327		static void
1991/1204		lptclose(Chan *c)
1992/0711		{ USED(c); }
1991/1204
1997/0327		static long lptread(Chan *c, void *a, long n, ulong)
1991/1204		{ char str[16]; int size; if(c->qid.path == CHDIR)
1997/0327		return devdirread(c, a, n, lptdir, nelem(lptdir), lptgen);
1991/1204		size = sprint(str, "0x%2.2ux\n", inb(c->qid.path)); if(c->offset >= size) return 0; if(c->offset+n > size) n = size-c->offset; memmove(a, str+c->offset, n); return n; }
1997/0327		static long lptwrite(Chan *c, void *a, long n, ulong)
1995/0108		{
1991/1204		char str[16], *p; long base, k; if(n <= 0) return 0; if(c->qid.path != Qdata){ if(n > sizeof str-1) n = sizeof str-1; memmove(str, a, n); str[n] = 0; outb(c->qid.path, strtoul(str, 0, 0)); return n; } p = a; k = n; base = lptbase[c->dev]; if(waserror()){ outb(base+Qpcr, Finitbar); nexterror(); } while(--k >= 0) outch(base, *p++); poperror(); return n;
1995/0108		}
1991/1204		static void outch(int base, int c) {
1994/0331		int status, tries;
1991/1204
1994/0331		for(tries = 0;; tries++){ status = inb(base+Qpsr); if(!(status & Fselect) || !(status & Fnoerror)) error(Eio); if(status & Fnotbusy) break; if(tries > 1000){ outb(base+Qpcr, Finitbar|Fie); tsleep(&lptrendez, lptready, (void *)base, MS2HZ); }
1991/1204		} outb(base+Qdlr, c); outb(base+Qpcr, Finitbar|Fstrobe); outb(base+Qpcr, Finitbar); } static int lptready(void *base) { return inb((int)base+Qpsr)&Fnotbusy; } static void
1994/0324		lptintr(Ureg *ur, void *arg)
1991/1204		{
1994/0324		USED(ur, arg);
1991/1204		wakeup(&lptrendez); }
1997/0327		Dev lptdevtab = { devreset, devinit, lptattach, devclone, lptwalk, lptstat, lptopen, devcreate, lptclose, lptread, devbread, lptwrite, devbwrite, devremove, devwstat, };