sys/boot/ofw/libofw/devicename.c

   1 /*-
   2  * Copyright (c) 1998 Michael Smith <msmith@freebsd.org>
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  24  * SUCH DAMAGE.
  25  *
  26  * $FreeBSD$
  27  * $DragonFly: src/sys/boot/ofw/libofw/devicename.c,v 1.1 2003/11/10 06:08:37 dillon Exp $
  28  */
  29
  30 #include <stand.h>
  31 #include "libofw.h"
  32
  33 static int ofw_parsedev(struct ofw_devdesc **, const char *, const char **);
  34
  35 /*
  36  * Point (dev) at an allocated device specifier for the device matching the
  37  * path in (devspec). If it contains an explicit device specification,
  38  * use that.  If not, use the default device.
  39  */
  40 int
  41 ofw_getdev(void **vdev, const char *devspec, const char **path)
  42 {
  43     struct ofw_devdesc **dev = (struct ofw_devdesc **)vdev;
  44     int                         rv;
  45
  46     /*
  47      * If it looks like this is just a path and no
  48      * device, go with the current device.
  49      */
  50     if ((devspec == NULL) ||
  51         (strchr(devspec, '@') == NULL)) {
  52
  53         if (((rv = ofw_parsedev(dev, getenv("currdev"), NULL)) == 0) &&
  54             (path != NULL))
  55                 *path = devspec;
  56         return(rv);
  57     }
  58
  59     /*
  60      * Try to parse the device name off the beginning of the devspec
  61      */
  62     return(ofw_parsedev(dev, devspec, path));
  63 }
  64
  65 /*
  66  * Point (dev) at an allocated device specifier matching the string version
  67  * at the beginning of (devspec).  Return a pointer to the remaining
  68  * text in (path).
  69  */
  70 static int
  71 ofw_parsedev(struct ofw_devdesc **dev, const char *devspec, const char **path)
  72 {
  73     struct ofw_devdesc  *idev;
  74     struct devsw        *dv;
  75     phandle_t           handle;
  76     const char          *p;
  77     const char          *s;
  78     char                name[256];
  79     char                type[64];
  80     int                 len;
  81     int                 i;
  82
  83     for (p = s = devspec; *s != '\0'; p = s) {
  84         if ((s = strchr(p + 1, '/')) == NULL)
  85             s = strchr(p, '\0');
  86         len = s - devspec;
  87         bcopy(devspec, name, len);
  88         name[len] = '\0';
  89         if ((handle = OF_finddevice(name)) == -1)
  90             break;
  91         if (OF_getprop(handle, "device_type", type, sizeof(type)) == -1)
  92             continue;
  93         for (i = 0; (dv = devsw[i]) != NULL; i++) {
  94             if (strncmp(dv->dv_name, type, strlen(dv->dv_name)) == 0)
  95                 goto found;
  96         }
  97     }
  98     return(ENOENT);
  99
 100 found:
 101     if (*s != '\0')
 102         *path = s;
 103     idev = malloc(sizeof(struct ofw_devdesc));
 104     strcpy(idev->d_path, name);
 105     idev->d_dev = dv;
 106     idev->d_type = dv->dv_type;
 107     if (dev == NULL) {
 108         free(idev);
 109     } else {
 110         *dev = idev;
 111     }
 112     return(0);
 113 }
 114
 115 int
 116 ofw_setcurrdev(struct env_var *ev, int flags, void *value)
 117 {
 118     struct ofw_devdesc  *ncurr;
 119     int                 rv;
 120
 121     if ((rv = ofw_parsedev(&ncurr, value, NULL)) != 0)
 122         return rv;
 123
 124     free(ncurr);
 125     env_setenv(ev->ev_name, flags | EV_NOHOOK, value, NULL, NULL);
 126     return 0;
 127 }