/* $OpenBSD: wsdisplay_compat_usl.c,v 1.33 2020/09/03 15:30:17 kettenis Exp $ */
/* $NetBSD: wsdisplay_compat_usl.c,v 1.12 2000/03/23 07:01:47 thorpej Exp $ */

/*
 * Copyright (c) 1998
 *	Matthias Drochner.  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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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/param.h>
#include <sys/systm.h>
#include <sys/timeout.h>
#include <sys/kernel.h>
#include <sys/proc.h>
#include <sys/signalvar.h>
#include <sys/malloc.h>
#include <sys/errno.h>
#include <sys/fcntl.h>

#include <dev/wscons/wsconsio.h>
#include <dev/wscons/wsdisplayvar.h>
#include <dev/wscons/wscons_callbacks.h>
#include <dev/wscons/wsdisplay_usl_io.h>

#ifdef WSDISPLAY_DEBUG
#define DPRINTF(x)	 if (wsdisplaydebug) printf x
int	wsdisplaydebug = 0;
#else
#define DPRINTF(x)
#endif

struct usl_syncdata {
	struct wsscreen *s_scr;
	struct process *s_process;
	pid_t s_pid;
	int s_flags;
#define SF_DETACHPENDING 1
#define SF_ATTACHPENDING 2
	int s_acqsig, s_relsig;
	int s_frsig; /* unused */
	void (*s_callback)(void *, int, int);
	void *s_cbarg;
	struct timeout s_attach_ch;
	struct timeout s_detach_ch;
};

int usl_sync_init(struct wsscreen *, struct usl_syncdata **,
		       struct process *, int, int, int);
void usl_sync_done(struct usl_syncdata *);
int usl_sync_check(struct usl_syncdata *);
struct usl_syncdata *usl_sync_get(struct wsscreen *);

int usl_detachproc(void *, int, void (*)(void *, int, int), void *);
int usl_detachack(struct usl_syncdata *, int);
void usl_detachtimeout(void *);
int usl_attachproc(void *, int, void (*)(void *, int, int), void *);
int usl_attachack(struct usl_syncdata *, int);
void usl_attachtimeout(void *);

static const struct wscons_syncops usl_syncops = {
	usl_detachproc,
	usl_attachproc,
#define _usl_sync_check ((int (*)(void *))usl_sync_check)
	_usl_sync_check,
#define _usl_sync_destroy ((void (*)(void *))usl_sync_done)
	_usl_sync_destroy
};

#ifndef WSCOMPAT_USL_SYNCTIMEOUT
#define WSCOMPAT_USL_SYNCTIMEOUT 5 /* seconds */
#endif
static int wscompat_usl_synctimeout = WSCOMPAT_USL_SYNCTIMEOUT;

int
usl_sync_init(struct wsscreen *scr, struct usl_syncdata **sdp,
    struct process *pr, int acqsig, int relsig, int frsig)
{
	struct usl_syncdata *sd;
	int res;

	if (acqsig <= 0 || acqsig >= NSIG || relsig <= 0 || relsig >= NSIG ||
	    frsig <= 0 || frsig >= NSIG)
		return (EINVAL);
	sd = malloc(sizeof(*sd), M_DEVBUF, M_NOWAIT);
	if (!sd)
		return (ENOMEM);
	sd->s_scr = scr;
	sd->s_process = pr;
	sd->s_pid = pr->ps_pid;
	sd->s_flags = 0;
	sd->s_acqsig = acqsig;
	sd->s_relsig = relsig;
	sd->s_frsig = frsig;
	timeout_set(&sd->s_attach_ch, usl_attachtimeout, sd);
	timeout_set(&sd->s_detach_ch, usl_detachtimeout, sd);
	res = wsscreen_attach_sync(scr, &usl_syncops, sd);
	if (res) {
		free(sd, M_DEVBUF, sizeof(*sd));
		return (res);
	}
	*sdp = sd;
	return (0);
}

void
usl_sync_done(struct usl_syncdata *sd)
{
	if (sd->s_flags & SF_DETACHPENDING) {
		timeout_del(&sd->s_detach_ch);
		(*sd->s_callback)(sd->s_cbarg, 0, 0);
	}
	if (sd->s_flags & SF_ATTACHPENDING) {
		timeout_del(&sd->s_attach_ch);
		(*sd->s_callback)(sd->s_cbarg, ENXIO, 0);
	}
	wsscreen_detach_sync(sd->s_scr);
	free(sd, M_DEVBUF, sizeof(*sd));
}

int
usl_sync_check(struct usl_syncdata *sd)
{
	if (sd->s_process == prfind(sd->s_pid))
		return (1);
	DPRINTF(("usl_sync_check: process %d died\n", sd->s_pid));
	usl_sync_done(sd);
	return (0);
}

struct usl_syncdata *
usl_sync_get(struct wsscreen *scr)
{
	struct usl_syncdata *sd;

	if (wsscreen_lookup_sync(scr, &usl_syncops, (void **)&sd))
		return (0);
	return (sd);
}

int
usl_detachproc(void *cookie, int waitok, void (*callback)(void *, int, int),
    void *cbarg)
{
	struct usl_syncdata *sd = cookie;

	if (!usl_sync_check(sd))
		return (0);

	/* we really need a callback */
	if (!callback)
		return (EINVAL);

	/*
	 * Normally, this is called from the controlling process.
	 * It is supposed to reply with a VT_RELDISP ioctl(), so
	 * it is not useful to tsleep() here.
	 */
	sd->s_callback = callback;
	sd->s_cbarg = cbarg;
	sd->s_flags |= SF_DETACHPENDING;
	prsignal(sd->s_process, sd->s_relsig);
	timeout_add_sec(&sd->s_detach_ch, wscompat_usl_synctimeout);

	return (EAGAIN);
}

int
usl_detachack(struct usl_syncdata *sd, int ack)
{
	if (!(sd->s_flags & SF_DETACHPENDING)) {
		DPRINTF(("usl_detachack: not detaching\n"));
		return (EINVAL);
	}

	timeout_del(&sd->s_detach_ch);
	sd->s_flags &= ~SF_DETACHPENDING;

	if (sd->s_callback)
		(*sd->s_callback)(sd->s_cbarg, (ack ? 0 : EIO), 1);

	return (0);
}

void
usl_detachtimeout(void *arg)
{
	struct usl_syncdata *sd = arg;

	DPRINTF(("usl_detachtimeout\n"));

	if (!(sd->s_flags & SF_DETACHPENDING)) {
		DPRINTF(("usl_detachtimeout: not detaching\n"));
		return;
	}

	sd->s_flags &= ~SF_DETACHPENDING;

	if (sd->s_callback)
		(*sd->s_callback)(sd->s_cbarg, EIO, 0);

	(void) usl_sync_check(sd);
}

int
usl_attachproc(void *cookie, int waitok, void (*callback)(void *, int, int),
    void *cbarg)
{
	struct usl_syncdata *sd = cookie;

	if (!usl_sync_check(sd))
		return (0);

	/* we really need a callback */
	if (!callback)
		return (EINVAL);

	sd->s_callback = callback;
	sd->s_cbarg = cbarg;
	sd->s_flags |= SF_ATTACHPENDING;
	prsignal(sd->s_process, sd->s_acqsig);
	timeout_add_sec(&sd->s_attach_ch, wscompat_usl_synctimeout);

	return (EAGAIN);
}

int
usl_attachack(struct usl_syncdata *sd, int ack)
{
	if (!(sd->s_flags & SF_ATTACHPENDING)) {
		DPRINTF(("usl_attachack: not attaching\n"));
		return (EINVAL);
	}

	timeout_del(&sd->s_attach_ch);
	sd->s_flags &= ~SF_ATTACHPENDING;

	if (sd->s_callback)
		(*sd->s_callback)(sd->s_cbarg, (ack ? 0 : EIO), 1);

	return (0);
}

void
usl_attachtimeout(void *arg)
{
	struct usl_syncdata *sd = arg;

	DPRINTF(("usl_attachtimeout\n"));

	if (!(sd->s_flags & SF_ATTACHPENDING)) {
		DPRINTF(("usl_attachtimeout: not attaching\n"));
		return;
	}

	sd->s_flags &= ~SF_ATTACHPENDING;

	if (sd->s_callback)
		(*sd->s_callback)(sd->s_cbarg, EIO, 0);

	(void) usl_sync_check(sd);
}

int
wsdisplay_usl_ioctl1(struct wsdisplay_softc *sc, u_long cmd, caddr_t data,
    int flag, struct proc *p)
{
	int idx, maxidx;

	switch (cmd) {
	    case VT_OPENQRY:
		maxidx = wsdisplay_maxscreenidx(sc);
		for (idx = 0; idx <= maxidx; idx++) {
			if (wsdisplay_screenstate(sc, idx) == 0) {
				*(int *)data = idx + 1;
				return (0);
			}
		}
		return (ENXIO);
	    case VT_GETACTIVE:
		idx = wsdisplay_getactivescreen(sc);
		*(int *)data = idx + 1;
		return (0);
	    case VT_ACTIVATE:
		if ((flag & FWRITE) == 0)
			return (EACCES);
		idx = *(long *)data - 1;
		if (idx < 0)
			return (EINVAL);
		return (wsdisplay_switch((struct device *)sc, idx, 1));
	    case VT_WAITACTIVE:
		if ((flag & FWRITE) == 0)
			return (EACCES);
		idx = *(long *)data - 1;
		if (idx < 0)
			return (EINVAL);
		return (wsscreen_switchwait(sc, idx));
	    case VT_GETSTATE:
#define ss ((struct vt_stat *)data)
		idx = wsdisplay_getactivescreen(sc);
		ss->v_active = idx + 1;
		ss->v_state = 0;
		maxidx = wsdisplay_maxscreenidx(sc);
		for (idx = 0; idx <= maxidx; idx++)
			if (wsdisplay_screenstate(sc, idx) == EBUSY)
				ss->v_state |= (1 << (idx + 1));
#undef ss
		return (0);

	    default:
		return (-1);
	}

	return (0);
}

int
wsdisplay_usl_ioctl2(struct wsdisplay_softc *sc, struct wsscreen *scr,
    u_long cmd, caddr_t data, int flag, struct proc *p)
{
	int intarg, res;
	u_long req;
	void *arg;
	struct usl_syncdata *sd;
	struct wskbd_bell_data bd;

	switch (cmd) {
	    case VT_SETMODE:
		if ((flag & FWRITE) == 0)
			return (EACCES);
#define newmode ((struct vt_mode *)data)
		if (newmode->mode == VT_PROCESS) {
			res = usl_sync_init(scr, &sd, p->p_p, newmode->acqsig,
					    newmode->relsig, newmode->frsig);
			if (res)
				return (res);
		} else {
			sd = usl_sync_get(scr);
			if (sd)
				usl_sync_done(sd);
		}
#undef newmode
		return (0);
	    case VT_GETMODE:
#define cmode ((struct vt_mode *)data)
		sd = usl_sync_get(scr);
		if (sd) {
			cmode->mode = VT_PROCESS;
			cmode->relsig = sd->s_relsig;
			cmode->acqsig = sd->s_acqsig;
			cmode->frsig = sd->s_frsig;
		} else
			cmode->mode = VT_AUTO;
#undef cmode
		return (0);
	    case VT_RELDISP:
		if ((flag & FWRITE) == 0)
			return (EACCES);
#define d ((int)(*(long *)data))
		sd = usl_sync_get(scr);
		if (!sd)
			return (EINVAL);
		switch (d) {
		    case VT_FALSE:
		    case VT_TRUE:
			return (usl_detachack(sd, (d == VT_TRUE)));
		    case VT_ACKACQ:
			return (usl_attachack(sd, 1));
		    default:
			return (EINVAL);
		}
#undef d
		return (0);

	    case KDENABIO:
	    case KDDISABIO:
		if ((flag & FWRITE) == 0)
			return (EACCES);
		/*
		 * This is a lie, but non-x86 platforms are not supposed to
		 * issue these ioctls anyway.
		 */
		return (0);

	    case KDSETRAD:
		if ((flag & FWRITE) == 0)
			return (EACCES);
		/* XXX ignore for now */
		return (0);

	    default:
		return (-1);

	    /*
	     * the following are converted to wsdisplay ioctls
	     */
	    case KDSETMODE:
		if ((flag & FWRITE) == 0)
			return (EACCES);
		req = WSDISPLAYIO_SMODE;
#define d ((int)(*(long *)data))
		switch (d) {
		    case KD_GRAPHICS:
			intarg = WSDISPLAYIO_MODE_MAPPED;
			break;
		    case KD_TEXT:
			intarg = WSDISPLAYIO_MODE_EMUL;
			break;
		    default:
			return (EINVAL);
		}
#undef d
		arg = &intarg;
		break;
	    case KDMKTONE:
		if ((flag & FWRITE) == 0)
			return (EACCES);
		req = WSKBDIO_COMPLEXBELL;
#define d ((int)(*(long *)data))
		if (d) {
#define PCVT_SYSBEEPF	1193182
			if (d >> 16) {
				bd.which = WSKBD_BELL_DOPERIOD;
			bd.period = d >> 16; /* ms */
			}
			else
				bd.which = 0;
			if (d & 0xffff) {
				bd.which |= WSKBD_BELL_DOPITCH;
				bd.pitch = PCVT_SYSBEEPF/(d & 0xffff); /* Hz */
			}
		} else
			bd.which = 0; /* default */
#undef d
		arg = &bd;
		break;
	    case KDSETLED:
		if ((flag & FWRITE) == 0)
			return (EACCES);
		req = WSKBDIO_SETLEDS;
		intarg = 0;
#define d ((int)(*(long *)data))
		if (d & LED_CAP)
			intarg |= WSKBD_LED_CAPS;
		if (d & LED_NUM)
			intarg |= WSKBD_LED_NUM;
		if (d & LED_SCR)
			intarg |= WSKBD_LED_SCROLL;
#undef d
		arg = &intarg;
		break;
	    case KDGETLED:
		req = WSKBDIO_GETLEDS;
		arg = &intarg;
		break;
#ifdef WSDISPLAY_COMPAT_RAWKBD
	    case KDSKBMODE:
		if ((flag & FWRITE) == 0)
			return (EACCES);
		req = WSKBDIO_SETMODE;
		switch ((int)(*(long *)data)) {
		    case K_RAW:
			intarg = WSKBD_RAW;
			break;
		    case K_XLATE:
			intarg = WSKBD_TRANSLATED;
			break;
		    default:
			return (EINVAL);
		}
		arg = &intarg;
		break;
	    case KDGKBMODE:
		req = WSKBDIO_GETMODE;
		arg = &intarg;
		break;
#endif
	}

	res = wsdisplay_internal_ioctl(sc, scr, req, arg, flag, p);
	if (res)
		return (res);

	switch (cmd) {
	    case KDGETLED:
#define d (*(int *)data)
		d = 0;
		if (intarg & WSKBD_LED_CAPS)
			d |= LED_CAP;
		if (intarg & WSKBD_LED_NUM)
			d |= LED_NUM;
		if (intarg & WSKBD_LED_SCROLL)
			d |= LED_SCR;
#undef d
		break;
#ifdef WSDISPLAY_COMPAT_RAWKBD
	    case KDGKBMODE:
		*(int *)data = (intarg == WSKBD_RAW ? K_RAW : K_XLATE);
		break;
#endif
	}

	return (0);
}