/*      $NetBSD: ofcons.c,v 1.45 2014/07/25 08:10:37 dholland Exp $     */

/*
* Copyright (C) 1995, 1996 Wolfgang Solfrank.
* Copyright (C) 1995, 1996 TooLs GmbH.
* 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. All advertising materials mentioning features or use of this software
*    must display the following acknowledgement:
*      This product includes software developed by TooLs GmbH.
* 4. The name of TooLs GmbH may not be used to endorse or promote products
*    derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``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 TOOLS GMBH 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.
*/

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: ofcons.c,v 1.45 2014/07/25 08:10:37 dholland Exp $");

#include <sys/param.h>
#include <sys/conf.h>
#include <sys/device.h>
#include <sys/proc.h>
#include <sys/systm.h>
#include <sys/callout.h>
#include <sys/tty.h>
#include <sys/kauth.h>

#include <dev/cons.h>

#include <dev/ofw/openfirm.h>

struct ofcons_softc {
       struct tty *of_tty;
       struct callout sc_poll_ch;
       int of_flags;
};
/* flags: */
#define OFPOLL          1

#define OFBURSTLEN      128     /* max number of bytes to write in one chunk */

cons_decl(ofcons_);

static int stdin, stdout;

static int ofcons_match(device_t, cfdata_t, void *);
static void ofcons_attach(device_t, device_t, void *);

CFATTACH_DECL_NEW(ofcons, sizeof(struct ofcons_softc),
   ofcons_match, ofcons_attach, NULL, NULL);

extern struct cfdriver ofcons_cd;

dev_type_open(ofcons_open);
dev_type_close(ofcons_close);
dev_type_read(ofcons_read);
dev_type_write(ofcons_write);
dev_type_ioctl(ofcons_ioctl);
dev_type_tty(ofcons_tty);
dev_type_poll(ofcons_poll);

const struct cdevsw ofcons_cdevsw = {
       .d_open = ofcons_open,
       .d_close = ofcons_close,
       .d_read = ofcons_read,
       .d_write = ofcons_write,
       .d_ioctl = ofcons_ioctl,
       .d_stop = nostop,
       .d_tty = ofcons_tty,
       .d_poll = ofcons_poll,
       .d_mmap = nommap,
       .d_kqfilter = ttykqfilter,
       .d_discard = nodiscard,
       .d_flag = D_TTY
};

static int ofcons_probe(void);

static int
ofcons_match(device_t parent, cfdata_t match, void *aux)
{
       struct ofbus_attach_args *oba = aux;

       if (strcmp(oba->oba_busname, "ofw"))
               return (0);
       if (!ofcons_probe())
               return 0;
       return OF_instance_to_package(stdin) == oba->oba_phandle
               || OF_instance_to_package(stdout) == oba->oba_phandle;
}

static void
ofcons_attach(device_t parent, device_t self, void *aux)
{
       struct ofcons_softc *sc = device_private(self);

       printf("\n");

       callout_init(&sc->sc_poll_ch, 0);
}

static void ofcons_start(struct tty *);
static int ofcons_param(struct tty *, struct termios *);
static void ofcons_pollin(void *);

int
ofcons_open(dev_t dev, int flag, int mode, struct lwp *l)
{
       struct ofcons_softc *sc;
       struct tty *tp;

       sc = device_lookup_private(&ofcons_cd, minor(dev));
       if (!sc)
               return ENXIO;
       if (!(tp = sc->of_tty))
               sc->of_tty = tp = tty_alloc();
       tp->t_oproc = ofcons_start;
       tp->t_param = ofcons_param;
       tp->t_dev = dev;
       if (kauth_authorize_device_tty(l->l_cred, KAUTH_DEVICE_TTY_OPEN, tp))
               return (EBUSY);
       if (!(tp->t_state & TS_ISOPEN)) {
               ttychars(tp);
               tp->t_iflag = TTYDEF_IFLAG;
               tp->t_oflag = TTYDEF_OFLAG;
               tp->t_cflag = TTYDEF_CFLAG;
               tp->t_lflag = TTYDEF_LFLAG;
               tp->t_ispeed = tp->t_ospeed = TTYDEF_SPEED;
               ofcons_param(tp, &tp->t_termios);
               ttsetwater(tp);
       }
       tp->t_state |= TS_CARR_ON;

       if (!(sc->of_flags & OFPOLL)) {
               sc->of_flags |= OFPOLL;
               callout_reset(&sc->sc_poll_ch, 1, ofcons_pollin, sc);
       }

       return (*tp->t_linesw->l_open)(dev, tp);
}

int
ofcons_close(dev_t dev, int flag, int mode, struct lwp *l)
{
       struct ofcons_softc *sc = device_lookup_private(&ofcons_cd, minor(dev));
       struct tty *tp = sc->of_tty;

       callout_stop(&sc->sc_poll_ch);
       sc->of_flags &= ~OFPOLL;
       (*tp->t_linesw->l_close)(tp, flag);
       ttyclose(tp);
       return 0;
}

int
ofcons_read(dev_t dev, struct uio *uio, int flag)
{
       struct ofcons_softc *sc = device_lookup_private(&ofcons_cd, minor(dev));
       struct tty *tp = sc->of_tty;

       return (*tp->t_linesw->l_read)(tp, uio, flag);
}

int
ofcons_write(dev_t dev, struct uio *uio, int flag)
{
       struct ofcons_softc *sc = device_lookup_private(&ofcons_cd, minor(dev));
       struct tty *tp = sc->of_tty;

       return (*tp->t_linesw->l_write)(tp, uio, flag);
}

int
ofcons_poll(dev_t dev, int events, struct lwp *l)
{
       struct ofcons_softc *sc = device_lookup_private(&ofcons_cd, minor(dev));
       struct tty *tp = sc->of_tty;

       return ((*tp->t_linesw->l_poll)(tp, events, l));
}
int
ofcons_ioctl(dev_t dev, u_long cmd, void *data, int flag, struct lwp *l)
{
       struct ofcons_softc *sc = device_lookup_private(&ofcons_cd, minor(dev));
       struct tty *tp = sc->of_tty;
       int error;

       if ((error = (*tp->t_linesw->l_ioctl)(tp, cmd, data, flag, l)) != EPASSTHROUGH)
               return error;
       return ttioctl(tp, cmd, data, flag, l);
}

struct tty *
ofcons_tty(dev_t dev)
{
       struct ofcons_softc *sc = device_lookup_private(&ofcons_cd, minor(dev));

       return sc->of_tty;
}

static void
ofcons_start(struct tty *tp)
{
       int s, len;
       u_char buf[OFBURSTLEN];

       s = spltty();
       if (tp->t_state & (TS_TIMEOUT | TS_BUSY | TS_TTSTOP)) {
               splx(s);
               return;
       }
       tp->t_state |= TS_BUSY;
       splx(s);
       len = q_to_b(&tp->t_outq, buf, OFBURSTLEN);
       OF_write(stdout, buf, len);
       s = spltty();
       tp->t_state &= ~TS_BUSY;
       if (ttypull(tp)) {
               tp->t_state |= TS_TIMEOUT;
               callout_schedule(&tp->t_rstrt_ch, 1);
       }
       splx(s);
}

static int
ofcons_param(struct tty *tp, struct termios *t)
{
       tp->t_ispeed = t->c_ispeed;
       tp->t_ospeed = t->c_ospeed;
       tp->t_cflag = t->c_cflag;
       return 0;
}

static void
ofcons_pollin(void *aux)
{
       struct ofcons_softc *sc = aux;
       struct tty *tp = sc->of_tty;
       char ch;

       while (OF_read(stdin, &ch, 1) > 0) {
               if (tp && (tp->t_state & TS_ISOPEN))
                       (*tp->t_linesw->l_rint)(ch, tp);
       }
       callout_reset(&sc->sc_poll_ch, 1, ofcons_pollin, sc);
}

static int
ofcons_probe(void)
{
       int chosen;
       char stdinbuf[4], stdoutbuf[4];

       if (stdin)
               return 1;
       if ((chosen = OF_finddevice("/chosen")) == -1)
               return 0;
       if (OF_getprop(chosen, "stdin", stdinbuf, sizeof stdinbuf) !=
             sizeof stdinbuf ||
           OF_getprop(chosen, "stdout", stdoutbuf, sizeof stdoutbuf) !=
             sizeof stdoutbuf)
               return 0;

       /* Decode properties. */
       stdin = of_decode_int(stdinbuf);
       stdout = of_decode_int(stdoutbuf);

       return 1;
}

void
ofcons_cnprobe(struct consdev *cd)
{
       int maj;

       if (!ofcons_probe())
               return;

       maj = cdevsw_lookup_major(&ofcons_cdevsw);
       cd->cn_dev = makedev(maj, 0);
       cd->cn_pri = CN_INTERNAL;
}

void
ofcons_cninit(struct consdev *cd)
{
}

int
ofcons_cngetc(dev_t dev)
{
       unsigned char ch = '\0';
       int l;

       while ((l = OF_read(stdin, &ch, 1)) != 1)
               if (l != -2 && l != 0)
                       return -1;
       return ch;
}

void
ofcons_cnputc(dev_t dev, int c)
{
       char ch = c;

       OF_write(stdout, &ch, 1);
}

void
ofcons_cnpollc(dev_t dev, int on)
{
       struct ofcons_softc *sc = device_lookup_private(&ofcons_cd, minor(dev));

       if (!sc)
               return;
       if (on) {
               if (sc->of_flags & OFPOLL)
                       callout_stop(&sc->sc_poll_ch);
               sc->of_flags &= ~OFPOLL;
       } else {
               if (!(sc->of_flags & OFPOLL)) {
                       sc->of_flags |= OFPOLL;
                       callout_reset(&sc->sc_poll_ch, 1, ofcons_pollin, sc);
               }
       }
}

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