/*      $NetBSD: ppi.c,v 1.25 2019/11/12 13:17:44 msaitoh Exp $ */

/*-
* Copyright (c) 1996-2003 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 GPIB interface
*/

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: ppi.c,v 1.25 2019/11/12 13:17:44 msaitoh Exp $");

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/callout.h>
#include <sys/conf.h>
#include <sys/device.h>
#include <sys/malloc.h>
#include <sys/proc.h>
#include <sys/uio.h>

#include <dev/gpib/gpibvar.h>

#include <dev/gpib/ppiio.h>

#include "ioconf.h"

struct  ppi_softc {
       device_t sc_dev;
       gpib_chipset_tag_t sc_ic;
       gpib_handle_t sc_hdl;

       int sc_address;                 /* GPIB address */
       int     sc_flags;
       int     sc_sec;
       struct  ppiparam sc_param;
#define sc_burst sc_param.burst
#define sc_timo  sc_param.timo
#define sc_delay sc_param.delay
       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

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

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

void    ppicallback(void *, int);
void    ppistart(void *);

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

dev_type_open(ppiopen);
dev_type_close(ppiclose);
dev_type_read(ppiread);
dev_type_write(ppiwrite);
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 = D_OTHER
};

#define UNIT(x)         minor(x)

#ifdef DEBUG
int     ppidebug = 0x80;
#define PDB_FOLLOW      0x01
#define PDB_IO          0x02
#define PDB_NOCHECK     0x80
#define DPRINTF(mask, str)      if (ppidebug & (mask)) printf str
#else
#define DPRINTF(mask, str)      /* nothing */
#endif

int
ppimatch(device_t parent, cfdata_t match, void *aux)
{

       return (1);
}

void
ppiattach(device_t parent, device_t self, void *aux)
{
       struct ppi_softc *sc = device_private(self);
       struct gpib_attach_args *ga = aux;

       printf("\n");

       sc->sc_dev = self;
       sc->sc_ic = ga->ga_ic;
       sc->sc_address = ga->ga_address;

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

       if (gpibregister(sc->sc_ic, sc->sc_address, ppicallback, sc,
           &sc->sc_hdl)) {
               aprint_error_dev(sc->sc_dev, "can't register callback\n");
               return;
       }

       sc->sc_flags = PPIF_ALIVE;
}

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);

       DPRINTF(PDB_FOLLOW, ("ppiopen(%" PRIx64 ", %x): flags %x\n",
           dev, flags, sc->sc_flags));

       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);
}

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

       sc = device_lookup_private(&ppi_cd, UNIT(dev));

       DPRINTF(PDB_FOLLOW, ("ppiclose(%" PRIx64 ", %x): flags %x\n",
                      dev, flags, sc->sc_flags));

       sc->sc_flags &= ~PPIF_OPEN;
       return (0);
}

void
ppicallback(void *v, int action)
{
       struct ppi_softc *sc = v;

       DPRINTF(PDB_FOLLOW, ("ppicallback: v=%p, action=%d\n", v, action));

       switch (action) {
       case GPIBCBF_START:
               ppistart(sc);
       case GPIBCBF_INTR:
               /* no-op */
               break;
#ifdef DEBUG
       default:
               DPRINTF(PDB_FOLLOW, ("ppicallback: unknown action %d\n",
                   action));
               break;
#endif
       }
}

void
ppistart(void *v)
{
       struct ppi_softc *sc = v;

       DPRINTF(PDB_FOLLOW, ("ppistart(%x)\n", device_unit(sc->sc_dev)));

       sc->sc_flags &= ~PPIF_DELAY;
       wakeup(sc);
}

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

       DPRINTF(PDB_FOLLOW, ("ppitimo(%x)\n", device_unit(sc->sc_dev)));

       sc->sc_flags &= ~(PPIF_UIO|PPIF_TIMO);
       wakeup(sc);
}

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

       DPRINTF(PDB_FOLLOW, ("ppiread(%" PRIx64 ", %p)\n", dev, uio));

       return (ppirw(dev, uio));
}

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

       DPRINTF(PDB_FOLLOW, ("ppiwrite(%" PRIx64 ", %p)\n", dev, uio));

       return (ppirw(dev, uio));
}

int
ppirw(dev_t dev, struct uio *uio)
{
       struct ppi_softc *sc = device_lookup_private(&ppi_cd, UNIT(dev));
       int s1, s2, len, cnt;
       char *cp;
       int error = 0, gotdata = 0;
       int buflen, address;
       char *buf;

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

       address = sc->sc_address;

       DPRINTF(PDB_FOLLOW|PDB_IO,
           ("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));

       buflen = uimin(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;
               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:
               s1 = splsoftclock();
               s2 = splbio();
               if (sc->sc_flags & PPIF_UIO) {
                       if (gpibrequest(sc->sc_ic, sc->sc_hdl) == 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) {
                       DPRINTF(PDB_IO,
                           ("ppirw: uiomove/sleep timo, flags %x\n",
                           sc->sc_flags));
                       if (sc->sc_flags & PPIF_TIMO) {
                               callout_stop(&sc->sc_timo_ch);
                               sc->sc_flags &= ~PPIF_TIMO;
                       }
                       splx(s1);
                       break;
               }
               splx(s1);
               /*
                * Perform the operation
                */
               if (uio->uio_rw == UIO_WRITE)
                       cnt = gpibsend(sc->sc_ic, address, sc->sc_sec,
                           cp, len);
               else
                       cnt = gpibrecv(sc->sc_ic, address, sc->sc_sec,
                           cp, len);
               s1 = splbio();
               gpibrelease(sc->sc_ic, sc->sc_hdl);
               DPRINTF(PDB_IO, ("ppirw: %s(%d, %x, %p, %d) -> %d\n",
                   uio->uio_rw == UIO_READ ? "recv" : "send",
                   address, sc->sc_sec, cp, len, cnt));
               splx(s1);
               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;
               }
               s1 = splsoftclock();
               /*
                * Operation timeout (or non-blocking), quit now.
                */
               if ((sc->sc_flags & PPIF_UIO) == 0) {
                       DPRINTF(PDB_IO, ("ppirw: timeout/done\n"));
                       splx(s1);
                       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, "gpib", 0);
                       if (error) {
                               splx(s1);
                               break;
                       }
               }
               splx(s1);
               /*
                * 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;
               }
       }
       s1 = 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(s1);
       /*
        * Adjust for those chars that we uiomove'ed but never wrote
        */
       if (uio->uio_rw == UIO_WRITE && cnt != len) {
               uio->uio_resid += (len - cnt);
               DPRINTF(PDB_IO, ("ppirw: short write, adjust by %d\n",
                   len - cnt));
       }
       free(buf, M_DEVBUF);
       DPRINTF(PDB_FOLLOW|PDB_IO, ("ppirw: return %d, resid %d\n",
           error, uio->uio_resid));
       return (error);
}

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);
}

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

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

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

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

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