BSD-SCCS END release

[unix-history] / usr / src / sys / hp300 / dev / ppi.c

/*
* Copyright (c) 1982, 1990, 1993
*      The Regents of the University of California.  All rights reserved.
*
* %sccs.include.redist.c%
*
*      @(#)ppi.c       8.2 (Berkeley) %G%
*/

/*
* Printer/Plotter HPIB interface
*/

#include "ppi.h"
#if NPPI > 0

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/errno.h>
#include <sys/uio.h>
#include <sys/malloc.h>

#include <hp/dev/device.h>
#include <hp300/dev/ppiioctl.h>

int     ppiattach(), ppistart();
void    ppitimo();
struct  driver ppidriver = {
       ppiattach, "ppi", ppistart,
};

struct  ppi_softc {
       int     sc_flags;
       struct  devqueue sc_dq;
       struct  hp_device *sc_hd;
       struct  ppiparam sc_param;
#define sc_burst sc_param.burst
#define sc_timo  sc_param.timo
#define sc_delay sc_param.delay
       int     sc_sec;
} ppi_softc[NPPI];

/* sc_flags values */
#define PPIF_ALIVE      0x01    
#define PPIF_OPEN       0x02    
#define PPIF_UIO        0x04
#define PPIF_TIMO       0x08
#define PPIF_DELAY      0x10

#define UNIT(x)         minor(x)

#ifdef DEBUG
int     ppidebug = 0x80;
#define PDB_FOLLOW      0x01
#define PDB_IO          0x02
#define PDB_NOCHECK     0x80
#endif

ppiattach(hd)
       register struct hp_device *hd;
{
       register struct ppi_softc *sc = &ppi_softc[hd->hp_unit];

#ifdef DEBUG
       if ((ppidebug & PDB_NOCHECK) == 0)
#endif
       /*
        * XXX: the printer/plotter doesn't seem to really return
        * an ID but this will at least prevent us from mistaking
        * a cs80 disk or tape for a ppi device.
        */
       if (hpibid(hd->hp_ctlr, hd->hp_slave) & 0x200)
               return(0);
       sc->sc_flags = PPIF_ALIVE;
       sc->sc_dq.dq_ctlr = hd->hp_ctlr;
       sc->sc_dq.dq_unit = hd->hp_unit;
       sc->sc_dq.dq_slave = hd->hp_slave;
       sc->sc_dq.dq_driver = &ppidriver;
       sc->sc_hd = hd;
       return(1);
}

ppiopen(dev, flags)
       dev_t dev;
{
       register int unit = UNIT(dev);
       register struct ppi_softc *sc = &ppi_softc[unit];

       if (unit >= NPPI || (sc->sc_flags & PPIF_ALIVE) == 0)
               return(ENXIO);
#ifdef DEBUG
       if (ppidebug & PDB_FOLLOW)
               printf("ppiopen(%x, %x): flags %x\n",
                      dev, flags, sc->sc_flags);
#endif
       if (sc->sc_flags & PPIF_OPEN)
               return(EBUSY);
       sc->sc_flags |= PPIF_OPEN;
       sc->sc_burst = PPI_BURST;
       sc->sc_timo = ppimstohz(PPI_TIMO);
       sc->sc_delay = ppimstohz(PPI_DELAY);
       sc->sc_sec = -1;
       return(0);
}

ppiclose(dev, flags)
       dev_t dev;
{
       register int unit = UNIT(dev);
       register struct ppi_softc *sc = &ppi_softc[unit];

#ifdef DEBUG
       if (ppidebug & PDB_FOLLOW)
               printf("ppiclose(%x, %x): flags %x\n",
                      dev, flags, sc->sc_flags);
#endif
       sc->sc_flags &= ~PPIF_OPEN;
       return(0);
}

ppistart(unit)
       int unit;
{
#ifdef DEBUG
       if (ppidebug & PDB_FOLLOW)
               printf("ppistart(%x)\n", unit);
#endif
       ppi_softc[unit].sc_flags &= ~PPIF_DELAY;
       wakeup(&ppi_softc[unit]);
       return (0);
}

void
ppitimo(unit)
       int unit;
{
#ifdef DEBUG
       if (ppidebug & PDB_FOLLOW)
               printf("ppitimo(%x)\n", unit);
#endif
       ppi_softc[unit].sc_flags &= ~(PPIF_UIO|PPIF_TIMO);
       wakeup(&ppi_softc[unit]);
}

ppiread(dev, uio)
       dev_t dev;
       struct uio *uio;
{

#ifdef DEBUG
       if (ppidebug & PDB_FOLLOW)
               printf("ppiread(%x, %x)\n", dev, uio);
#endif
       return (ppirw(dev, uio));
}

ppiwrite(dev, uio)
       dev_t dev;
       struct uio *uio;
{

#ifdef DEBUG
       if (ppidebug & PDB_FOLLOW)
               printf("ppiwrite(%x, %x)\n", dev, uio);
#endif
       return (ppirw(dev, uio));
}

ppirw(dev, uio)
       dev_t dev;
       register struct uio *uio;
{
       int unit = UNIT(dev);
       register struct ppi_softc *sc = &ppi_softc[unit];
       register int s, len, cnt;
       register char *cp;
       int error = 0, gotdata = 0;
       int buflen;
       char *buf;

       if (uio->uio_resid == 0)
               return(0);

#ifdef DEBUG
       if (ppidebug & (PDB_FOLLOW|PDB_IO))
               printf("ppirw(%x, %x, %c): burst %d, timo %d, resid %x\n",
                      dev, uio, uio->uio_rw == UIO_READ ? 'R' : 'W',
                      sc->sc_burst, sc->sc_timo, uio->uio_resid);
#endif
       buflen = min(sc->sc_burst, uio->uio_resid);
       buf = (char *)malloc(buflen, M_DEVBUF, M_WAITOK);
       sc->sc_flags |= PPIF_UIO;
       if (sc->sc_timo > 0) {
               sc->sc_flags |= PPIF_TIMO;
               timeout(ppitimo, (void *)unit, sc->sc_timo);
       }
       while (uio->uio_resid > 0) {
               len = min(buflen, uio->uio_resid);
               cp = buf;
               if (uio->uio_rw == UIO_WRITE) {
                       error = uiomove(cp, len, uio);
                       if (error)
                               break;
               }
again:
               s = splbio();
               if ((sc->sc_flags & PPIF_UIO) && hpibreq(&sc->sc_dq) == 0)
                       sleep(sc, PRIBIO+1);
               /*
                * Check if we timed out during sleep or uiomove
                */
               (void) splsoftclock();
               if ((sc->sc_flags & PPIF_UIO) == 0) {
#ifdef DEBUG
                       if (ppidebug & PDB_IO)
                               printf("ppirw: uiomove/sleep timo, flags %x\n",
                                      sc->sc_flags);
#endif
                       if (sc->sc_flags & PPIF_TIMO) {
                               untimeout(ppitimo, (void *)unit);
                               sc->sc_flags &= ~PPIF_TIMO;
                       }
                       splx(s);
                       break;
               }
               splx(s);
               /*
                * Perform the operation
                */
               if (uio->uio_rw == UIO_WRITE)
                       cnt = hpibsend(sc->sc_hd->hp_ctlr, sc->sc_hd->hp_slave,
                                      sc->sc_sec, cp, len);
               else
                       cnt = hpibrecv(sc->sc_hd->hp_ctlr, sc->sc_hd->hp_slave,
                                      sc->sc_sec, cp, len);
               s = splbio();
               hpibfree(&sc->sc_dq);
#ifdef DEBUG
               if (ppidebug & PDB_IO)
                       printf("ppirw: %s(%d, %d, %x, %x, %d) -> %d\n",
                              uio->uio_rw == UIO_READ ? "recv" : "send",
                              sc->sc_hd->hp_ctlr, sc->sc_hd->hp_slave,
                              sc->sc_sec, cp, len, cnt);
#endif
               splx(s);
               if (uio->uio_rw == UIO_READ) {
                       if (cnt) {
                               error = uiomove(cp, cnt, uio);
                               if (error)
                                       break;
                               gotdata++;
                       }
                       /*
                        * Didn't get anything this time, but did in the past.
                        * Consider us done.
                        */
                       else if (gotdata)
                               break;
               }
               s = splsoftclock();
               /*
                * Operation timeout (or non-blocking), quit now.
                */
               if ((sc->sc_flags & PPIF_UIO) == 0) {
#ifdef DEBUG
                       if (ppidebug & PDB_IO)
                               printf("ppirw: timeout/done\n");
#endif
                       splx(s);
                       break;
               }
               /*
                * Implement inter-read delay
                */
               if (sc->sc_delay > 0) {
                       sc->sc_flags |= PPIF_DELAY;
                       timeout((void (*)__P((void *)))ppistart, (void *)unit,
                           sc->sc_delay);
                       error = tsleep(sc, PCATCH|PZERO+1, "hpib", 0);
                       if (error) {
                               splx(s);
                               break;
                       }
               }
               splx(s);
               /*
                * Must not call uiomove again til we've used all data
                * that we already grabbed.
                */
               if (uio->uio_rw == UIO_WRITE && cnt != len) {
                       cp += cnt;
                       len -= cnt;
                       cnt = 0;
                       goto again;
               }
       }
       s = splsoftclock();
       if (sc->sc_flags & PPIF_TIMO) {
               untimeout(ppitimo, (void *)unit);
               sc->sc_flags &= ~PPIF_TIMO;
       }
       if (sc->sc_flags & PPIF_DELAY) {
               untimeout((void (*)__P((void *)))ppistart, (void *)unit);
               sc->sc_flags &= ~PPIF_DELAY;
       }
       splx(s);
       /*
        * Adjust for those chars that we uiomove'ed but never wrote
        */
       if (uio->uio_rw == UIO_WRITE && cnt != len) {
               uio->uio_resid += (len - cnt);
#ifdef DEBUG
               if (ppidebug & PDB_IO)
                       printf("ppirw: short write, adjust by %d\n",
                              len-cnt);
#endif
       }
       free(buf, M_DEVBUF);
#ifdef DEBUG
       if (ppidebug & (PDB_FOLLOW|PDB_IO))
               printf("ppirw: return %d, resid %d\n", error, uio->uio_resid);
#endif
       return (error);
}

ppiioctl(dev, cmd, data, flag)
       dev_t dev;
       u_long cmd;
       caddr_t data;
       int flag;
{
       struct ppi_softc *sc = &ppi_softc[UNIT(dev)];
       struct ppiparam *pp, *upp;
       int error = 0;

       switch (cmd) {
       case PPIIOCGPARAM:
               pp = &sc->sc_param;
               upp = (struct ppiparam *)data;
               upp->burst = pp->burst;
               upp->timo = ppihztoms(pp->timo);
               upp->delay = ppihztoms(pp->delay);
               break;
       case PPIIOCSPARAM:
               pp = &sc->sc_param;
               upp = (struct ppiparam *)data;
               if (upp->burst < PPI_BURST_MIN || upp->burst > PPI_BURST_MAX ||
                   upp->delay < PPI_DELAY_MIN || upp->delay > PPI_DELAY_MAX)
                       return(EINVAL);
               pp->burst = upp->burst;
               pp->timo = ppimstohz(upp->timo);
               pp->delay = ppimstohz(upp->delay);
               break;
       case PPIIOCSSEC:
               sc->sc_sec = *(int *)data;
               break;
       default:
               return(EINVAL);
       }
       return (error);
}

ppihztoms(h)
       int h;
{
       extern int hz;
       register int m = h;

       if (m > 0)
               m = m * 1000 / hz;
       return(m);
}

ppimstohz(m)
       int m;
{
       extern int hz;
       register int h = m;

       if (h > 0) {
               h = h * hz / 1000;
               if (h == 0)
                       h = 1000 / hz;
       }
       return(h);
}
#endif