/*      $NetBSD: ppi.c,v 1.48 2020/11/18 02:22:16 thorpej Exp $ */

/*-
* Copyright (c) 1996, 1997 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Jason R. Thorpe.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
*    notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
*    notice, this list of conditions and the following disclaimer in the
*    documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/

/*
* Copyright (c) 1982, 1990, 1993
*      The Regents of the University of California.  All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
*    notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
*    notice, this list of conditions and the following disclaimer in the
*    documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
*    may be used to endorse or promote products derived from this software
*    without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
*      @(#)ppi.c       8.1 (Berkeley) 6/16/93
*/

/*
* Printer/Plotter HPIB interface
*/

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: ppi.c,v 1.48 2020/11/18 02:22:16 thorpej Exp $");

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/callout.h>
#include <sys/conf.h>
#include <sys/device.h>
#include <sys/errno.h>
#include <sys/kmem.h>
#include <sys/proc.h>
#include <sys/uio.h>

#include <hp300/dev/hpibvar.h>

#include <hp300/dev/ppiioctl.h>

#include "ioconf.h"

struct  ppi_softc {
       device_t sc_dev;
       int     sc_flags;
       struct  hpibqueue sc_hq;        /* HP-IB job queue entry */
       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;
       int     sc_slave;               /* HP-IB slave address */
       struct  callout sc_timo_ch;
       struct  callout sc_start_ch;
};

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

static int      ppimatch(device_t, cfdata_t, void *);
static void     ppiattach(device_t, device_t, void *);

CFATTACH_DECL_NEW(ppi, sizeof(struct ppi_softc),
   ppimatch, ppiattach, NULL, NULL);

static dev_type_open(ppiopen);
static dev_type_close(ppiclose);
static dev_type_read(ppiread);
static dev_type_write(ppiwrite);
static dev_type_ioctl(ppiioctl);

const struct cdevsw ppi_cdevsw = {
       .d_open = ppiopen,
       .d_close = ppiclose,
       .d_read = ppiread,
       .d_write = ppiwrite,
       .d_ioctl = ppiioctl,
       .d_stop = nostop,
       .d_tty = notty,
       .d_poll = nopoll,
       .d_mmap = nommap,
       .d_kqfilter = nokqfilter,
       .d_discard = nodiscard,
       .d_flag = 0
};

static void     ppistart(void *);
static void     ppinoop(void *);

static void     ppitimo(void *);
static int      ppirw(dev_t, struct uio *);
static int      ppihztoms(int);
static int      ppimstohz(int);

#define UNIT(x)         minor(x)

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

static int
ppimatch(device_t parent, cfdata_t cf, void *aux)
{
       struct hpibbus_attach_args *ha = aux;

       /*
        * The printer/plotter doesn't return an ID tag.
        * The check below prevents us from matching a CS80
        * device by mistake.
        */
       if (ha->ha_id & 0x200)
               return 0;

       /*
        * To prevent matching all unused slots on the bus, we
        * don't allow wildcarded locators.
        */
       if (cf->hpibbuscf_slave == HPIBBUSCF_SLAVE_DEFAULT ||
           cf->hpibbuscf_punit == HPIBBUSCF_PUNIT_DEFAULT)
               return 0;

       return 1;
}

static void
ppiattach(device_t parent, device_t self, void *aux)
{
       struct ppi_softc *sc = device_private(self);
       struct hpibbus_attach_args *ha = aux;

       sc->sc_dev = self;
       aprint_normal("\n");

       sc->sc_slave = ha->ha_slave;

       callout_init(&sc->sc_timo_ch, 0);
       callout_init(&sc->sc_start_ch, 0);

       /* Initialize the hpib queue entry. */
       sc->sc_hq.hq_softc = sc;
       sc->sc_hq.hq_slave = sc->sc_slave;
       sc->sc_hq.hq_start = ppistart;
       sc->sc_hq.hq_go = ppinoop;
       sc->sc_hq.hq_intr = ppinoop;

       sc->sc_flags = PPIF_ALIVE;
}

static void
ppinoop(void *arg)
{
       /* Noop! */
}

int
ppiopen(dev_t dev, int flags, int fmt, struct lwp *l)
{
       struct ppi_softc *sc;

       sc = device_lookup_private(&ppi_cd,UNIT(dev));
       if (sc == NULL)
               return ENXIO;

       if ((sc->sc_flags & PPIF_ALIVE) == 0)
               return ENXIO;

#ifdef DEBUG
       if (ppidebug & PDB_FOLLOW)
               printf("ppiopen(%"PRIx64", %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;
}

static int
ppiclose(dev_t dev, int flags, int fmt, struct lwp *l)
{
       struct ppi_softc *sc = device_lookup_private(&ppi_cd, UNIT(dev));

#ifdef DEBUG
       if (ppidebug & PDB_FOLLOW)
               printf("ppiclose(%"PRIx64", %x): flags %x\n",
                      dev, flags, sc->sc_flags);
#endif
       sc->sc_flags &= ~PPIF_OPEN;
       return 0;
}

static void
ppistart(void *arg)
{
       struct ppi_softc *sc = arg;

#ifdef DEBUG
       if (ppidebug & PDB_FOLLOW)
               printf("ppistart(%x)\n", device_unit(sc->sc_dev));
#endif
       sc->sc_flags &= ~PPIF_DELAY;
       wakeup(sc);
}

static void
ppitimo(void *arg)
{
       struct ppi_softc *sc = arg;

#ifdef DEBUG
       if (ppidebug & PDB_FOLLOW)
               printf("ppitimo(%x)\n", device_unit(sc->sc_dev));
#endif
       sc->sc_flags &= ~(PPIF_UIO|PPIF_TIMO);
       wakeup(sc);
}

static int
ppiread(dev_t dev, struct uio *uio, int flags)
{

#ifdef DEBUG
       if (ppidebug & PDB_FOLLOW)
               printf("ppiread(%"PRIx64", %p)\n", dev, uio);
#endif
       return ppirw(dev, uio);
}

static int
ppiwrite(dev_t dev, struct uio *uio, int flags)
{

#ifdef DEBUG
       if (ppidebug & PDB_FOLLOW)
               printf("ppiwrite(%"PRIx64", %p)\n", dev, uio);
#endif
       return ppirw(dev, uio);
}

static int
ppirw(dev_t dev, struct uio *uio)
{
       struct ppi_softc *sc = device_lookup_private(&ppi_cd, UNIT(dev));
       int s, s2, len, cnt;
       char *cp;
       int error = 0, gotdata = 0;
       int ctlr, slave;
       char *buf;

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

       ctlr = device_unit(device_parent(sc->sc_dev));
       slave = sc->sc_slave;

#ifdef DEBUG
       if (ppidebug & (PDB_FOLLOW|PDB_IO))
               printf("ppirw(%"PRIx64", %p, %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
       const int buflen = uimin(sc->sc_burst, uio->uio_resid);
       buf = kmem_alloc(buflen, KM_SLEEP);
       sc->sc_flags |= PPIF_UIO;
       if (sc->sc_timo > 0) {
               sc->sc_flags |= PPIF_TIMO;
               callout_reset(&sc->sc_timo_ch, sc->sc_timo, ppitimo, sc);
       }
       len = cnt = 0;
       while (uio->uio_resid > 0) {
               len = uimin(buflen, uio->uio_resid);
               cp = buf;
               if (uio->uio_rw == UIO_WRITE) {
                       error = uiomove(cp, len, uio);
                       if (error)
                               break;
               }
again:
               s = splsoftclock();
               s2 = splbio();
               if ((sc->sc_flags & PPIF_UIO) &&
                   hpibreq(device_parent(sc->sc_dev), &sc->sc_hq) == 0)
                       (void) tsleep(sc, PRIBIO + 1, "ppirw", 0);
               /*
                * Check if we timed out during sleep or uiomove
                */
               splx(s2);
               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) {
                               callout_stop(&sc->sc_timo_ch);
                               sc->sc_flags &= ~PPIF_TIMO;
                       }
                       splx(s);
                       break;
               }
               splx(s);
               /*
                * Perform the operation
                */
               if (uio->uio_rw == UIO_WRITE)
                       cnt = hpibsend(ctlr, slave, sc->sc_sec, cp, len);
               else
                       cnt = hpibrecv(ctlr, slave, sc->sc_sec, cp, len);
               s = splbio();
               hpibfree(device_parent(sc->sc_dev), &sc->sc_hq);
#ifdef DEBUG
               if (ppidebug & PDB_IO)
                       printf("ppirw: %s(%d, %d, %x, %p, %d) -> %d\n",
                              uio->uio_rw == UIO_READ ? "recv" : "send",
                              ctlr, 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;
                       callout_reset(&sc->sc_start_ch, sc->sc_delay,
                           ppistart, sc);
                       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) {
               callout_stop(&sc->sc_timo_ch);
               sc->sc_flags &= ~PPIF_TIMO;
       }
       if (sc->sc_flags & PPIF_DELAY) {
               callout_stop(&sc->sc_start_ch);
               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
       }
       kmem_free(buf, buflen);
#ifdef DEBUG
       if (ppidebug & (PDB_FOLLOW|PDB_IO))
               printf("ppirw: return %d, resid %d\n", error, uio->uio_resid);
#endif
       return error;
}

static int
ppiioctl(dev_t dev, u_long cmd, void *data, int flag, struct lwp *l)
{
       struct ppi_softc *sc = device_lookup_private(&ppi_cd,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;
}

static int
ppihztoms(int h)
{
       int m = h;

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

static int
ppimstohz(int m)
{
       int h = m;

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

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