/*      $NetBSD: openfirmio.c,v 1.15 2019/12/06 06:38:39 mrg Exp $ */

/*
* Copyright (c) 1992, 1993
*      The Regents of the University of California.  All rights reserved.
*
* This software was developed by the Computer Systems Engineering group
* at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
* contributed to Berkeley.
*
* All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
*      This product includes software developed by the University of
*      California, Lawrence Berkeley Laboratory.
*
* 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.
*
*      @(#)openfirm.c  8.1 (Berkeley) 6/11/93
*/

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: openfirmio.c,v 1.15 2019/12/06 06:38:39 mrg Exp $");

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/errno.h>
#include <sys/fcntl.h>
#include <sys/ioctl.h>
#include <sys/malloc.h>
#include <sys/conf.h>
#include <sys/device.h>
#include <sys/event.h>

#include <dev/ofw/openfirm.h>
#include <dev/ofw/openfirmio.h>

static  int lastnode;                   /* speed hack */

static int openfirmcheckid (int, int);
static int openfirmgetstr (int, char *, char **);

void openfirmattach (int);

static dev_type_open(openfirmopen);
static dev_type_ioctl(openfirmioctl);

const struct cdevsw openfirm_cdevsw = {
       .d_open = openfirmopen,
       .d_close = nullclose,
       .d_read = noread,
       .d_write = nowrite,
       .d_ioctl = openfirmioctl,
       .d_stop = nostop,
       .d_tty = notty,
       .d_poll = nopoll,
       .d_mmap = nommap,
       .d_kqfilter = nokqfilter,
       .d_discard = nodiscard,
       .d_flag = 0
};

void
openfirmattach(int num)
{
       /* nothing */
}

/*
* Verify target ID is valid (exists in the OPENPROM tree), as
* listed from node ID sid forward.
*/
static int
openfirmcheckid(int sid, int tid)
{

       for (; sid != 0; sid = OF_peer(sid))
               if (sid == tid || openfirmcheckid(OF_child(sid), tid))
                       return (1);

       return (0);
}

static int
openfirmgetstr(int len, char *user, char **cpp)
{
       int error;
       char *cp;

       /* Reject obvious bogus requests */
       if ((u_int)len > (8 * 1024) - 1)
               return (ENAMETOOLONG);

       *cpp = cp = malloc(len + 1, M_TEMP, M_WAITOK);
       error = copyin(user, cp, len);
       cp[len] = '\0';
       return (error);
}

static int
openfirmopen(dev_t dev, int flag, int mode, struct lwp *l)
{

       return 0;
}

static int
openfirmioctl(dev_t dev, u_long cmd, void *data, int flags, struct lwp *l)
{
       struct ofiocdesc *of;
       int node, len, ok, error, s;
       char *name, *value;

       if (cmd == OFIOCGETOPTNODE) {
               s = splhigh();
               *(int *) data = OF_finddevice("/options");
               splx(s);
               return (0);
       }

       /* Verify node id */
       of = (struct ofiocdesc *)data;
       node = of->of_nodeid;
       if (node != 0 && node != lastnode) {
               /* Not an easy one, must search for it */
               s = splhigh();
               ok = openfirmcheckid(OF_peer(0), node);
               splx(s);
               if (!ok)
                       return (EINVAL);
               lastnode = node;
       }

       name = value = NULL;
       error = 0;
       switch (cmd) {

       case OFIOCGET:
               if ((flags & FREAD) == 0)
                       return (EBADF);
               if (node == 0)
                       return (EINVAL);
               error = openfirmgetstr(of->of_namelen, of->of_name, &name);
               if (error)
                       break;
               s = splhigh();
               len = OF_getproplen(node, name);
               splx(s);
               if (len > of->of_buflen) {
                       error = ENOMEM;
                       break;
               }
               of->of_buflen = len;
               /* -1 means no entry; 0 means no value */
               if (len <= 0)
                       break;
               value = malloc(len, M_TEMP, M_WAITOK);
               if (value == NULL) {
                       error = ENOMEM;
                       break;
               }
               s = splhigh();
               len = OF_getprop(node, name, (void *)value, len);
               splx(s);
               error = copyout(value, of->of_buf, len);
               break;


       case OFIOCSET:
               if ((flags & FWRITE) == 0)
                       return (EBADF);
               if (node == 0)
                       return (EINVAL);
               error = openfirmgetstr(of->of_namelen, of->of_name, &name);
               if (error)
                       break;
               error = openfirmgetstr(of->of_buflen, of->of_buf, &value);
               if (error)
                       break;
               s = splhigh();
               len = OF_setprop(node, name, value, of->of_buflen + 1);
               splx(s);

               /*
                * XXX
                * some OF implementations return the buffer length including
                * the trailing zero ( like macppc ) and some without ( like
                * FirmWorks OF used in Shark )
                */
               if ((len != (of->of_buflen + 1)) && (len != of->of_buflen))
                       error = EINVAL;
               break;

       case OFIOCNEXTPROP: {
               char newname[32];
               if ((flags & FREAD) == 0)
                       return (EBADF);
               if (node == 0)
                       return (EINVAL);
               if (of->of_namelen != 0) {
                       error = openfirmgetstr(of->of_namelen, of->of_name,
                           &name);
                       if (error)
                               break;
               }
               s = splhigh();
               ok = OF_nextprop(node, name, newname);
               splx(s);
               if (ok == 0) {
                       error = ENOENT;
                       break;
               }
               if (ok == -1) {
                       error = EINVAL;
                       break;
               }
               len = strlen(newname);
               if (len > of->of_buflen)
                       len = of->of_buflen;
               else
                       of->of_buflen = len;
               error = copyout(newname, of->of_buf, len);
               break;
       }

       case OFIOCGETNEXT:
               if ((flags & FREAD) == 0)
                       return (EBADF);
               s = splhigh();
               node = OF_peer(node);
               splx(s);
               *(int *)data = lastnode = node;
               break;

       case OFIOCGETCHILD:
               if ((flags & FREAD) == 0)
                       return (EBADF);
               if (node == 0)
                       return (EINVAL);
               s = splhigh();
               node = OF_child(node);
               splx(s);
               *(int *)data = lastnode = node;
               break;

       case OFIOCFINDDEVICE:
               if ((flags & FREAD) == 0)
                       return (EBADF);
               error = openfirmgetstr(of->of_namelen, of->of_name, &name);
               if (error)
                       break;
               node = OF_finddevice(name);
               if (node == 0 || node == -1) {
                       error = ENOENT;
                       break;
               }
               of->of_nodeid = lastnode = node;
               break;

       default:
               return (ENOTTY);
       }

       if (name)
               free(name, M_TEMP);
       if (value)
               free(value, M_TEMP);

       return (error);
}

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